CA 02798533 2015-11-27
METHODS AND SYSTEMS FOR USE IN PROVIDING PLAYBACK OF
VARIABLE LENGTH CONTENT IN A FIXED LENGTH FRAMEWORK
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FIELD OF THE INVENTION
The present invention relates generally to recorded content, and more
particularly to accommodating variable length content associated with a
recording
medium.
BACKGROUND
Next generation digital media formats, such as Blu-ray Disc and HD-DVD
Disc, generally require that data is prepared and stored on a disc in such a
manner to
describe content that is stored on the disc. Typically, this information is
stored in a read
only manner that does not support the direct modification of such descriptive
data. As
such, content played back from the disc is immediately dated when it is
recorded to the
disc. Further, some data or content stored on the disc rapidly can become
outdated or
obsolete.
SUMMARY OF THE EMBODIMENT
The present invention advantageously addresses the needs above as well as
other needs through the provision of methods and systems for use in providing
supplemental content to be played back with a portable storage medium through
a
playback device that conforms to a fixed length content framework. Some
methods
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receive a request for supplemental content from a playback device; identify
the
supplemental content; retrieve supplemental content; access a predefined clip
template
defined prior to receiving the request; process the supplemental content and
generating a
plurality of clips of supplemental content that have a playback length that is
a fraction of
a playback length of the supplemental content; and forward supplemental
content clips to
the requesting playback device.
A better understanding of the features and advantages of the present invention
will be obtained by reference to the following detailed description of the
invention and
accompanying drawings which set forth an illustrative embodiment in which the
principles of the invention are utilized.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other aspects, features and advantages of the present invention
will be more apparent from the following more particular description thereof,
presented
in conjunction with the following drawings wherein:
FIG. 1 depicts a simplified diagram of a file structure according to some
embodiments;
FIG. 2 depicts a simplified block diagram of a playback device according to
some embodiments;
FIG. 3 depicts a simplified block diagram of a system according to some
embodiments that enables the accommodation of variable length content in a
fixed length
framework and/or standard;
FIG. 4 depicts a simplified block diagram of a server that distributes
supplemental content to a playback device, or to remote memory storage
devices;
FIG. 5 depicts a simplified flow diagram of a process for use in playing back
supplemental content that does not have a fixed duration in association with a
portable
storage medium through a playback device that complies with a fixed length
framework;
FIG. 6 depicts a simplified flow diagram of a process according to some
embodiments that implements steps of the process of FIG. 5 in initiating
playback and
detecting the expiration of the actual playback duration of supplemental
content;
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FIG. 7 depicts a simplified block diagram of a graphical representation of a
process for authoring a storage medium and supplemental content that can be
obtained
for playback in cooperation with the authored storage medium;
FIG. 8 depicts a simplified block diagram of a graphical representation of a
process for authoring a storage medium and supplemental content;
FIG. 9 depicts a simplified block diagram of a conformer according to some
embodiments;
FIG. 10 depicts a simplified block diagram of a graphical representation of a
selection process in accordance with the selection unit of the conformer of
FIG. 9 in
accordance with the template clip information file;
FIG. 11 depicts a simplified block diagram of a graphical representation of a
process for segmenting a stream of supplemental content in accordance with a
predefined
clip template to generate clips of supplemental content;
FIG. 12 depicts a simplified flow diagram of a process of segmenting
supplemental content into clips of supplemental content;
FIG. 13 depicts a simplified flow diagram of a process implemented by a
content source or supplier that can format supplemental content associated
with a
portable storage medium;
FIG. 14 depicts a simplified flow diagram of a process of distributing
supplemental content from remote sources to a playback device;
FIG. 15 depicts a simplified flow diagram of a process, implemented through
the playback device, of generating padding at the playback device;
FIG. 16 depicts a simplified flow diagram of a process to incorporate padding
into a content stream at the playback device, in according to some
implementations, with
the use of one or more packet mapping files;
FIG. 17 depicts a simplified flow diagram of a process implemented by a
source provider in producing a null template stream that can be utilized by a
playback
device in incorporating null data into a content stream;
FIG. 18 depicts a simplified flow diagram implemented by a playback device
in incorporating null packets into a content stream in accordance with some
embodiments;
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FIG. 19 depicts a simplified flow diagram of a process implemented by a
playback device to select a content stream in accordance with a selected rate
and to
switch to a subsequent stream having a different rate;
FIG. 20 depicts a simplified graphical representation of a clip template that
is
employed in defining clip information and segmenting of supplemental content
to be
forwarded, for example from a server over the Internet to a playback device;
FIG. 21 depicts a simplified graphical representation of a clip template that
can be employed in generating clip information and segmenting supplemental
content to
be forwarded, for example from a remote data storage over the Internet, to a
playback
device;
FIG. 22 depicts a simplified block diagram of a process according to some
embodiments to generate a clip template that can be used in processing and/or
generation
of clips of supplemental content according to some embodiments;
FIG. 23 depicts a simplified flow diagram of a process implemented by a
content source or provider in generating clips of a supplemental content
stream in
accordance with some embodiments;
FIG. 24 depicts a simplified flow diagram of a process implemented by a
playback device in playing back content;
FIG. 25 depicts a simplified block flow diagram of a process of capturing and
distributing the content over time as the content is captured, for example,
during a live
performance or event to be played back in cooperation with a medium, such as a
portable
storage medium, at a playback device;
FIG. 26 depicts a simplified flow diagram of a process according to some
embodiments that is implemented by the processing unit in processing segments
of
content from one or more sources;
FIG. 27 is a simplified block diagram of a data flow process for processing
supplemental content according to some embodiments in generating clips of
content and
clip information corresponding to the generated clips of supplemental content;
FIG. 28 depicts a simplified block diagram representation of a data flow in
segmenting content according to some embodiments;
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FIG. 29 depicts a simplified block diagram of a data flow for generating
segments of content to be forwarded to a playback device. In this flow the
content is
segmented as it is captured; and
FIG. 30 depicts a simplified flow diagram of a process of configuring and
recording content to a portable storage medium to be utilized with a playback
device that
conforms to a fixed length content framework.
Corresponding reference characters indicate corresponding components
throughout the several views of the drawings. Skilled artisans will appreciate
that
elements in the figures are illustrated for simplicity and clarity and have
not necessarily
been drawn to scale. For example, the dimensions of some of the elements in
the figures
may be exaggerated relative to other elements to help to improve understanding
of
various embodiments of the present invention. Also, common but well-understood
elements that are useful or necessary in a commercially feasible embodiment
are often
not depicted in order to facilitate a less obstructed view of these various
embodiments of
the present invention.
DETAILED DESCRIPTION
The present embodiments provide methods, systems and apparatuses for use
in accommodating the playback of variable length content within fixed length
frameworks and/or standards. These fixed length frameworks generally require
that
content, such as multimedia content, to be played back through these
frameworks be
fixed in length, playback duration and/or be associated with a index, and that
the fixed
length, duration or index be predefined prior to initiating playback of
content from the
medium or content played back in association with the content on the medium.
For
example, some fixed length frameworks provide for the playback of content from
a
portable, digital storage medium. Content to be played back in association
with the
portable storage medium must be know and the length and typically the data
size of the
content generally has to be known prior to allowing playback of content from
the portable
storage medium or playback of content associated with the portable storage
medium to be
initiated. The present embodiments, however, provide systems and methods for
accommodating and allowing the playback of content within these frameworks
when the
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length and/or playback duration is not recorded on the medium, and does not
have to be
known at the time playback of content on the medium or playback of content
associated
with the medium is initiated.
Portable digital recording and/or storage mediums are used to record content.
In many instances, portable digital recording mediums are recorded with
multimedia
content allowing users to purchase the mediums and gain access to the
multimedia
content. Often the multimedia content is recorded in accordance with a
predefined
standard so that the multimedia content can be accurately played back through
multiple
different types of players that recognize and conform to the given standard.
The recording of the multimedia content on to the medium, however, requires
the content to be known at the time content is to be recorded on to the
medium. Some
advanced or next generation frameworks, standards and/or formats, such as but
not
limited to Blu-ray Disc and HD DVD Disc, allow supplemental data and/or
content not
recorded on the medium to be played back in cooperation with the content
recorded on
the medium (e.g., accessed over a distributed communication network, such as
the
Internet). To accomplish this cooperation of playback many of the standards or
formats,
such as Blu-ray Disc and HD DVD Disc, require that the format, descriptive
data and/or
information about the content be prepared and recorded on a medium along with
the
multimedia content, such that this descriptive data defines or describes the
multimedia
content that is stored on the medium as well as all content that is not
recorded on the
medium but is to be played back in cooperation with the medium. In some
standards the
descriptive data is referred to, for example, as clip or chunk information. To
simplify the
description of the embodiments of the invention described below, the
descriptive data
will be referred to below as clip information. It will be appreciated by those
skilled in the
art that the clip information is not restricted to a single standard or
framework, can
comprise substantially any relevant information about content and should not
be
interpreted to limit the scope of the claims.
The clip information generally is required according to many standards and
frameworks to be fixed at the time content is recorded to the medium, and
further to
specifically define the parameters of content recorded on the medium and
corresponding
supplemental content not record on the medium at the time content is recorded
to the
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medium. This fixed clip information typically defines a data size (e.g.,
number of bytes
or bits of data), a length or playback duration and other file specifications.
In some
instances, the clip information or index can define playback durations and can
further
index or reference portions or points within a content stream where playback
can be
started within a particular clip, which can be used in some instances to
implement
seeking over the content stream, such as a random access seek. The clip
information is
typically stored on the medium in a read only manner that does not support the
direct
modification of such clip information. Further, a playback device typically
needs to have
and know all of the clip information prior to initiating playback of content
from the
medium and/or supplemental content associated with the medium.
As a result, supplemental content that is to be played back in cooperation
with
the medium has to be known prior to recording and/or burning the medium so
that clip
information about the supplemental content can be recorded on the medium.
Further, this
fixes the supplemental content from changing as the clip information typically
includes
specific information and parameters of the supplemental content including the
data size
(e.g., in bytes) as well as the length or playback duration at the time clip
information
and/or content is burned to the medium.
Some present embodiments, however, allow for a variation from this fixed
supplemental content by supplying new or revised clip information to the
playback
device prior to beginning play back of multimedia content and supplemental
content
associated with the medium. As described above, however, the playback devices
that
conform with the fixed length standards, however, generally have to know all
of the clip
information for all of the content, whether recorded on the medium or
supplemental
content retrieved from a secondary or remote storage, prior to beginning
playback of
content relative to the medium. As a result, upon receiving revised clip
information, for
example from a remote source supplying supplemental content to be played back
in
cooperation with a medium at the playback device, the playback device
typically has to
implement a shutdown, reboot, restart or closing of an application and its
associated
memory context in order to effectively reload the content and clip information
and any
corresponding application. The reloading of the content and clip information
makes the
clip information for the content on the medium as well as the revised clip
information
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available upon initiation of playback relative to the medium. Additionally,
the reloading
allows the revised clip information to be appropriately associated with and
applied with
the content recorded on the medium prior to playback of content from the
medium or the
associated supplemental content. This reloading is often slow and dramatically
affects
performance and a user's experience. For example with regard to the Blu-ray
Standard, a
Blu-ray disc (BD) environment would need to reload a file system when updating
the clip
information which underpins the playback applications. As such, these
applications
typically also have to reload as well. The file system similarly is reloaded
because the
new clip information has to effectively be virtually mapped to a specific file
directory and
file name that is accessible by the playback engine layer in the BD system.
This
remapping typically also requires a file system reload, some times referred to
as a virtual
file system (VFS) update.
Many frameworks or standards do not allow arbitrary content to be
downloaded without having previous knowledge of the layout and mapping of the
content. Further with many standards specifications, the content made
available to the
user relative to a medium is predefined and declared during the initial start-
up or prior to
initiating playback of content relative to the portable storage medium. This
is a
significant drawback to content owners distributing content as well as to
consumers in
attempting to access and playback supplemental content not recorded on the
medium that
may be available and cooperated with the content recorded on the medium.
As such, fixed length frameworks have at least three significant drawbacks in
providing supplemental content that is not predefined on the medium or that is
not fixed
in length at the time the content is accessed to be played back. First, the
clip information
of the multimedia content and any supplemental content to be cooperated with
the
multimedia content has to be known before beginning playback. Second, the
playback
device has to be restarted upon receiving the revised and actual clip
information in those
instances where the clip information is not recorded on the medium. Third, the
clip
information of the multimedia content and supplemental content has to remain
static after
playback begins. This can significantly limit the benefits of providing
supplemental
content and can significantly adversely affect a user's playback experience.
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Some embodiments, provide methods, playback devices, data structures, and
systems for use in providing alternative methods of delivering variable length
supplemental content, for example over a network connection, to a playback
device that
employs a fixed length content framework or standard that requires a pre-
deterministic
structure of clip information. Further, some embodiments advantageously
provide for the
cooperated playback of content recorded on a read only medium with
supplemental
content, such as dynamically delivered content, having variable lengths. This
dynamically delivered content does not have to have a fixed length, can be
supplied
during playback of content from the medium without requiring a shutdown of the
playback device, and further in some instances can include user generated
content and/or
live or substantially live content with an unknown length to be played back in
cooperation with the portable storage medium.
Typically, the supplemental content complies with one or more formatting
standards compatible with the playback device, and often has similar audio
and/or video
attributes (e.g. VC-1 video, DD+ audio, 8-bit RLE sub-pictures, and the like)
as the
content(s) recorded on the medium. For example, supplemental content can be,
but is not
limited to, dynamically created content (e.g., user generated videos, audio
recordings,
images, commentary of content played back from a medium, etc.), variable
length
audio/video clips or chunks (e.g., music videos, mp3 files, movies, television
programs,
etc.), theatrical trailers, live hosted events, secondary content to be
displayed with or in
place of content from the storage medium (e.g., secondary video/audio content
delivered
as "picture-in-picture" content), content conforming with a fixed length of a
feature on a
medium (e.g., a movie), and other such variable length content, where the
length or
playback duration is not known at the time content is burned or recorded to
the medium
or even at the time playback of content relative to the medium is initiated.
Further in
some embodiments, the portable storage medium can be a container or shell that
complies
with fixed length standards, but does not include any content or only a
minimal amount
of content, and instead is used as a key or access to other supplemental
content retrieved
from a separate storage medium (e.g., received from a remote storage device)
that is
played back through the playback device in cooperation with the medium.
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In some implementations, a content designation place holder is recorded on
the medium defining that supplemental content not recorded on the medium can
be
obtained and cooperated for playback. Place holder clip information is further
recorded
on the medium specifically associated with the content place holder. This
place holder
clip information when recorded to the medium defines a size, length, playback
duration,
duration timing, playback timing and/or other parameters for the supplemental
content,
where the supplemental content does not have to be known at the time the
content place
holder and place holder clip information is recorded on the medium. Further,
the place
holder clip information is defined with a data size and/or playback duration
that is greater
than an expected data size, duration, duration length, playback time or the
like of
supplemental content that may be later provided to the playback device to be
played back
in cooperation with the content recorded and/or defined on the portable
storage medium.
The present embodiments, therefore, allow supplemental content not recorded on
a
portable storage medium to be played back in cooperation with the portable
storage
medium without knowing what the supplemental content is prior to burning the
medium
and without requiring the playback device to be restarted in accordance with
fixed length
frameworks after playback of content associated with the medium has commenced.
For example, with some recording medium specifications the medium has
recorded thereon a file structure that includes a listing directory or
playlist defining the
content to be played back relative to the medium. FIG. 1 depicts a simplified
diagram of
a file structure 120 according to some embodiments. The file structure 120
includes one
or more listing directories or playlists 122 that include content designation
or playlist
files 124 and can optionally include place holders 128, one or more a clip
information
directories or listings 126 that include clip information files 130, and a
stream directory
132 with content files 134 configured to be played back and/or rendered
through a
playback device (e.g., video content, audio content, audio/video (AN) content,
text,
graphics, images, and other relevant such content). In some instances the file
structure
120 can additionally include menu directory and/or files 136; auxiliary data
directory 138
containing, for example, sound data files, graphics files, font files and/or
other such data;
backup directory 140; programming, code and/or executables 142; and other
relevant
content, code, executables and/or data.
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As introduced above, the listing directory or playlist 122 defines content to
be
played back in accordance with the medium. The playlist 122 includes content
designations, such as playlist files 124 that reference content 134 in the
stream directory
132 to be played back, and can further include content place holders 128 that
represent or
designate a playback of content not recorded on a portable storage medium with
the file
structure 120 but intended to be played back in cooperation with respect to
the medium.
The content place holders 128, in some instances, trigger implementation
programming
142 defined on the medium to initiate access to the supplemental content
(e.g., accessible
from a secondary memory storage). Further, the place holder 128 or
corresponding clip
information 130 can designate a link or reference to access the supplemental
content not
recorded on the portable storage medium. For example, the place holder 128 may
define
an Internet link to a remote server from which supplemental content can be
retrieved.
The place holder 128 and/or clip information 130, in some embodiments, may
further
define access rights or identify where access rights can be retrieved.
Alternatively, the
access rights can be determined by a remote source and are not related to the
clip
information.
The clip information listing or directory 126 includes the clip information
and/or files 130. Each clip information 130 corresponds to one of the content
designations 124 or one of the place holders 128. The clip information 130
defines the
indexes, parameters, attributes, characteristics, timing information, settings
and the like
of content 134 referenced by the corresponding playlist file 124, or the
potential
supplemental content referenced by the corresponding place holders 128.
Further, clip
information 130 corresponding to place holders 128 can, in some instances,
include a
link, mapping or other designation of where and/or how the supplemental
content can be
accessed.
The place holder 128 and corresponding clip information 130 associated with
the place holder, in some embodiments, defines a duration, data size, playback
timing,
number of frames and/or other such relevant parameter for the corresponding
supplemental content. Further, these designations of timing, duration, data
size and the
like are defined to be in excess of substantially any expected supplemental
content that is
expected to be associated with the corresponding place holder 128, or are
specified to
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allow a repeat or looping in accordance with the clip information as fully
described
below. This allows substantially any potential supplemental content having a
duration,
length and/or the like that is less than or equal to the designated duration
or length
specified in the place holder clip information, or that can be played back in
accordance
with the repeat playback, to be played back and/or utilized with the
associated place
holder. Further, an actual duration, length or data size of the supplemental
content does
not need to be known prior to beginning playback of content from the medium or
supplemental content being played back in cooperation with the portable
storage medium.
In some implementations, such as with the Blu-ray BD-ROM and the like, one
or more of the place holders 128 can be defined by a combination of clip
information
files 130, playlist files 124, titles and content protection system (CPS)
files. The
supplemental content that is acquired is data that matches up with the place
holder
information. Further, the remote location from which the supplemental content
can be
received can be determined by application software 142 running from the media.
For
example, this application software 142 can query, from over a distributed
communication
network, the content owner provided network service to determine a source from
which
the supplemental content can be retrieved and/or downloaded. Access rights can
be
defined in the CPS files, and in some instances these access rights are
defined at the
granularity of titles. CPS files can either pre-exist on the medium (e.g., a
disc) or be
updated over the network. In some instances, updating the CPS files may
initiate a
virtual file system (VFS) update and/or implement a title shut down and
restart.
In some embodiments, a program or programming 142 recorded on the
medium, as described further below, is activated upon the completion of
playback of
supplemental content accessed in response to a place holder 128 to override or
terminate
the duration designated by the place holder clip information 130, and returns
playback
control to the playback device to continue playback as defined, in some
instances, by the
playlist directory 122. In some instances, the programming or code 142 is
recorded on
the medium, and this programming can be activated prior to and/or upon
accessing
supplemental content for playback designated by a place holder 128. This
programming
includes a return control programming function, as described above and further
below,
that overrides or terminates the place holder duration specified by the place
holder clip
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information 130 corresponding to the active place holder 128 upon completion
of
playback of the supplemental content, and returns control of the playback to
the playback
device and/or a user interface upon completion of the playback of the
supplemental
content. This effectively terminates the playback of the supplemental content
and returns
to control back to a user interface and/or the playback device.
Programming 142 can further be initiated, in some implementations, to
implement a communication with a remote server or storage device to determine
what
supplemental content is available. In some instances, the medium contains
information,
metadata, XML documents or predefined communication scheme or rule set that
allows
the player to contact, communicate with and pull information from a server.
Supplemental content can be returned from the server and the playback device
aided by
programming 142, initiates playback of the supplemental content. In some
embodiments,
upon receiving information back from the server, programming 142 implemented
by the
playback device controls a user interface to display a listing of available
content through
the server and allows a user to interact with the playback device by selecting
from the
listing.
FIG. 2 depicts a simplified block diagram of a playback device 220 according
to some embodiments that can playback content from a portable storage medium
222,
such as a Blu-ray Disc (BD), in cooperation with supplemental content. The
playback
device includes one or more processors or controllers 226, memory and/or
digital storage
228-229, one or more medium drives 232 including a portable storage medium
drive to
allow direct access to a portable storage medium 222, one or more ports or
communication interfaces 234, one or more user interfaces 236 and other
relevant
components such as internal communication links and/or buses (not shown), and
the like.
The media playback device 220 can be substantially any relevant playback
device capable of playing content back from a storage medium and typically a
portable
storage medium. The processor(s) 226 can be one or more microprocessors,
minicomputers or other such processing devices or combinations of devices
programmed
to provide the described functionality. In some embodiments the processor 226
includes
video and/or audio processing functionality, such as decoders, encoders and
the like;
however, the video and/or audio processing functionality can be implemented
through
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separate devices within the playback device cooperated with the processor 226,
and/or
implemented through hardware, software or a combination thereof.
The memory 228 is a memory internal to the playback device, is coupled with
the processor 226 and typically includes one or more processor and/or computer-
readable
mediums accessed by at least the processor 226. The memory 228 can include
volatile
and/or nonvolatile media, such as RAM, ROM, EEPROM, buffer memory, flash
memory
or other memory technology. Further, the memory 228 can store firmware 240,
software
242, network or communication drives 244, executables 246, scripts 248,
multimedia
content 250, data 252, profiles and/or account information 254, network device
ID and/or
address 256, supplemental content 260 and the like. Similarly, memory 229 can
be a
separate or external memory coupled with a communication interface 234 to
allow for the
retrieval and/or recording of data, content, executables, scripts, multimedia
content,
profiles and/or account information, supplemental content and the like. Memory
drive
232 is a portable storage memory drive that receives the portable storage
medium 222
and allows content to be retrieved from and/or recorded to the portable
storage medium.
The portable storage medium 222 can be substantially any portable computer
readable
medium, such as a disc, flash memory and other such memory.
The communication interfaces 234 provide interfaces, ports, connections,
antenna and the like through which the playback device 220 can communicate
with other
remote devices and/or communication networks. These communication interfaces
can
include interfaces such as, but not limited to, a parallel port, an IEEE 1394
serial port, a
game port, a USB port, an IR interface, RF interfaces, antenna or other such
interfaces.
The one or more user interfaces 236 allows the user to interact with the
playback device
220 and can include substantially any relevant interface, such as a display,
keyboard,
mouse, physical buttons, an optical or radio communication interface for
communicating
with one or more remote controls, speakers, and other such user interfaces.
FIG. 3 depicts a simplified block diagram of a system 320 according to some
embodiments that enables the accommodation of variable length content in a
fixed length
framework and/or standard. The system 320 includes one or more playback
devices 322,
a communication network 324, one or more servers 326, and optionally one or
more
remote memory storage devices 328.
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In some embodiments, the playback devices 322 can be similar to the
playback device 220 of FIG. 2 and coupled with the communication network 324.
The
servers 326 similarly couple with the communication network to communicate
with one
or more of the playback devices 322, other servers 326, the remote memory
storage 328
or other devices communicationally coupled with the communication network 324.
The
communication network 324 can be substantially any communication network, such
as
but not limited to the Internet, an Intranet, a LAN and/or other relevant
communication
networks.
The server 326, at least in part, receives requests from and returns or
authorizes access to supplemental content to a playback device 322 to be
played back.
The supplemental content can be supplied directly from the server 326 or the
playback
device can be routed by the server 326 to a remote memory storage 328. In some
instances, the server 326 can additionally verify authorization to access the
supplemental
content, verify a user, maintain a user profile and utilize the user profile
in some
instances in determining to which supplemental content a user can be provided
access,
maintain logs and/or records of access to content, manage the storage of
supplemental
content and other such functions. Further, in some embodiments, the server can
format
supplemental content prior to distributing the supplemental content to a
playback device
322. This formatting as fully described below can include generating clip
information,
segmenting content, encrypting content and other such formatting, in addition
to
packaging content to be communicated over the communication network 324.
FIG. 4 depicts a simplified block diagram of a server 326 that distributes
supplemental content to a playback device 322, or to remote memory storage
devices
328. The server 326 typically includes one or more processors or controllers
422,
memory and/or digital storage 424, one or more encoders 426, one or more
multiplexors
428, one or more segmenting units 430, clip information generator 432 and one
or more
ports or communication interfaces 434. The server 326 can optionally also
include one or
more user interfaces 436 (e.g., display, keyboard, mouse, physical buttons,
wireless
communication interface and other such user interfaces).
The processor(s) 422 can be one or more microprocessors, minicomputers or
other such processing devices or combinations of devices. In some embodiments
the
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processor 422 includes video and/or audio processing functionality, such as
decoders,
encoders 426, multiplexor(s) 428 and the like. In some embodiments, some or
all of the
encoder 426, multiplexor 428, segmenting unit 430 and clip information
generator 432
are implemented by the processor 422 through software to provide video and/or
audio
processing functionality. Additionally or alternatively, this multimedia
processing
functionality can be implemented through separate devices within the server
326 or
external to the server. Further, the video and/or audio processing can be
implemented
through hardware, software or a combination thereof.
The memory 424 can be substantially any type of memory, including but not
limited to volatile and/or nonvolatile media, such as RAM, ROM, EEPROM, buffer
memory, flash memory or other memory technology. Further, the memory 424 can
store
firmware 440, software 442, network or communication drives 444, programming
and
executables 446, scripts 448, multimedia content 450, supplemental content
452, data
454, profiles and/or account information 456, logs and/or history data 458 and
the like.
The communication interfaces 434 provide interfaces, ports, connections,
antenna and the
like through which the server 326 can communicate with other remote devices
and/or
communication networks 324.
As described above, the playback device, e.g., playback device 220 of FIG. 2,
in accessing and playing back content relevant to a portable storage medium
detects a
place holder 128 and retrieves place holder clip information 130 associated
with that
place holder. The playback device 220 identifies a source for supplemental
content (e.g.,
local memory 228, external memory 229, and remote source, such as a server
326), and
in some instances identifies the supplemental content, which in some
implementations
can be designated relative to the place holder 128 and place holder clip
information 130.
In many instances the identification of the supplemental content is unknown
until a
source for the supplemental content is accessed and the source for the content
identifies
the supplemental content or provides the user with a listing of available
supplemental
content. This allows the supplemental content to be updated or changed at any
time.
Upon identifying the source of the supplemental content the playback device
220 accesses the source and retrieves actual clip information and supplemental
content
associated with the medium. The playback device can initiate playback of the
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supplemental content in cooperation with the portable storage medium 222. In
some
instances, the actual duration of the supplemental content extracted from the
actual clip
information acts, at least in part, to override the place holder duration
designated in the
place holder clip information 130. In other instances the duration designated
in the place
holder clip information 130 is maintained but overridden upon completion of
playback of
the supplemental content. Again as described above, the place holder clip
information
130 can include a hypothetical or potential playback duration (and/or other
relevant
parameter, such but not limited to playback timing, frame number, number of
frames, or
other such parameters). This potential playback duration typically is
specified to be
greater than actual durations of one or more expected, anticipated or
potential
supplemental content. Once the supplemental content is played back the
termination of
the actual duration of the supplemental content is detected inducing a
termination of the
playback duration (e.g., through a media stop command) and returning control
to the
playback device 220.
FIG. 5 depicts a simplified flow diagram of a process 520 for use in playing
back supplemental content that does not have a fixed duration in association
with a
portable storage medium 222 through a playback device that conforms with a
fixed
length framework. As such, the playback device needs to have all of the clip
information
for the content prior to initiating played back. In step 522, the process
detects access to a
portable storage medium 222. For example, this detection can include detecting
the
insertion of the portable medium 222 into the playback device 220. In step
524, playback
parameters of the playback device are identified and/or determined. As
introduced above
and further described below, the playback parameters define relevant
capabilities of the
playback device (e.g., processing capabilities, buffer size, decoding rates
and the like),
whether the playback device is communicationally coupled with a secondary data
storage
or a network 324, network connection parameters when the playback device 220
is
coupled with the network 324 (e.g., communication bandwidth) and other such
relevant
parameters.
Step 526 is entered to determine whether multiple playlists are defined on the
portable storage medium. When only a single playlist is defined the process
skips to step
532 to initiate playback. Alternatively, the process continues to step 530 to
select an
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appropriate playlist based on the identified relevant playback parameters. The
selection
further takes into consideration whether the playback device is connected with
a
communication network 324. Again, the playlist defines the playback of the
content on
the medium and in some instances supplemental content that can be played back
in
association with the medium 222. Further, the playlist includes the designated
clip
information 130 regarding the content to be played back in relation to the
portable storage
medium 222.
In step 532, playback is initiated based on the single playlist or the
playlist
selected in step 530. In step 534 it is determined whether a place holder 128
is detected
in the playlist directory 122 designating that supplemental content not
recorded on the
portable storage medium 222 is to be played back in cooperation with the
portable
storage medium. Often the playback device detects the place holders in advance
of when
content associated with the place holder 128 is to be played back. Further, it
is desired in
some implementations that the place holder is detected with sufficient time to
access the
additional source (e.g., server 326) and at least begin acquiring the
supplemental content
to be played back so that the playback continues with limited, and preferably
no delay
relative to playback of content recorded on the portable storage medium.
When a place holder 128 is detected step 536 is entered where the additional
source for the supplemental content is identified, whether local memory 228-
229 of the
playback device 220 or a remote source (e.g., a server 326 or memory storage
device 328
accessed over the network 324), and access to the additional source is
utilized to access
the additional source. In some instances, the place holder clip information
130
corresponding to the identified place holder 128 defines the source of
supplemental
content. In other embodiments, however, the access to a source may be defined
with the
place holder 128, defined on the playback device, designated in some other
portion of the
medium or other source. The location of the supplemental content can, in some
instances, be defined within a programmed application (either directly in
source code or
within associated resources), obtained by querying network services to
dynamically
determine the location and the like. Further, the location could either be
defined on a
network (e.g., URL), defined locally (e.g., device local storage) and/or
potentially
synthesized content. For example, in some applications the programmed
application may
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be capable of dynamically creating some types of content directly (e.g.,
images, audio
and the like) and writing them to local storage for playback.
In step 540 details of supplemental content and the communication of the
supplemental content is requested from the additional source. In some
instances,
programming 142 on the portable storage medium is implemented to request
details of
packaging and/or the supplemental content to be downloaded, streamed,
progressively
played back or otherwise obtained at the playback device for playback.
Further, the
additional source 326, in some instances evaluates some or all of the playback
parameters
and/or determines relevant parameters, and based on this evaluation identifies
supplemental content, formatting and/or a template to be used in forwarding
the
supplemental content. The process 520 continues to step 542 where information,
data
and/or metadata is received at the playback device 220 from the additional
source 326
defining parameters of the supplemental content and/or the communication of
the
supplemental content. For example, the information can include metadata for
audio/video supplemental content including information for downloading the
supplemental content (e.g., XML data defining parameters of audio/video
content and
audio/video package to be downloaded to the playback device), information for
receiving
streamed supplemental content (e.g., XML data defining parameters of
audio/video
content and network URL describing location of content to be streamed),
information for
employing progressive playback (e.g., data defining parameters of audio/video
content
and network URL describing location of content to be downloaded), information
defining
actual playback duration or timing of the supplemental content, commands, and
other
such relevant information.
In step 544 playback of the supplemental content is initiated. It is noted
that
the playback of the supplemental content can be initiated prior to receiving
all of the
supplemental content, for example through streaming and/or progressive
downloads as
further described below. In step 546 it is determined whether playback of the
supplemental content has completed. This determination can be based on an
actual
playback duration supplied in metadata, a command (e.g., media stop command)
or other
such determination. In those instances where playback has not completed the
process
returns to step 544 to continue playback. Alternatively, step 548 is entered
where the
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playback duration designated in the playlist 122 and associated with the
relevant place
holder is overridden to designate a termination of playback relative to the
place holder
128.
In step 550, control of playback is returned to the playback device relative
to
the playlist directory 122, for example, to provide a graphical user
interface, continue
playback relative to the playlist or other relevant actions. In some
embodiments,
programming 142 is implemented from the portable storage medium 222 that
provides
functionality to return control back to the playlist, a graphical user
interface or a user
interface (UI) after a duration and playback of the supplemental content. Such
functionality can include a timer set to a duration specified in metadata
passed from the
additional source (e.g., server 326) describing an actual duration of the
supplemental
content, a command such as "MediaStop" which is issued at the duration of the
supplemental content (e.g., as specified in metadata passed from the server),
or other such
functionality. Once the duration of elapsed time of the supplemental content
is exceeded,
a stop command is issued or other such indication of completion of playback of
the
supplemental content is detected, playback control can be transferred back to
the play
back device or to a user interface (e.g., a Title UI).
FIG. 6 depicts a simplified flow diagram of a process 620 according to some
embodiments that implements steps 544 and 546 of the process 520 of FIG. 5 in
initiating
playback and detecting the expiration of the actual playback duration
indicating that the
supplemental content has completed its play back. In step 622, actual
supplemental
content clip information is received from the source of the supplemental
content. In step
624, an actual duration, playback timing or the like of the supplemental
content is
extracted from the supplemental content clip information.
In step 626, it is determined whether playback of the supplemental content is
to be implemented. In some instances, the supplemental content is retrieved
prior to
initiating playback so that the supplemental content is available at a time
playback is to
begin to avoid delays in playback and provide a continuous playback of
content. When it
is determined that a trigger or timing to initiate the playback of the
supplemental content
has not been received, the process 620 continues to loop back to step 626
awaiting a time
or instructions to initiate playback. In step 628, playback of the
supplemental content is
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initiated. In step 630, a counter or clock is activated or playback timing is
tracked in
accordance with the actual duration, time code or playback timing of the
supplemental
content.
The process 620 then continues to step 632 to determine whether the playback
of the supplemental content is paused or halted. In some instance, a user or
the playback
device 220 may initiate an alternate action. For example, a user may issue a
pause
command or other command, the play back device may detect that still other
supplemental content is to be cooperated in playback during the playback of
the current
supplemental content, and other conditions or factors may result in a pause of
the
playback of the supplemental content. In those instances where a pause is
detected, step
634 is entered where the process pauses the playback of the supplemental
content and
pauses the clock or counter associated with the actual duration of the
supplemental
content. Playback is continued in step 636 when the pause terminates, the
clock or
counter is reactivated and the process returns to step 632.
In step 640, it is determined whether the clock or counter has reached the
defined actual duration of the supplemental content, a designated playback
timing is
reached or a stop command is detected signifying that the supplemental content
has
completed its playback. When it is determined that the playback has not
completed, the
process 620 continues to step 642 to determine whether other commands are to
be
implemented (e.g., skip forward, pause, stop, display a menu, change content
streams,
and other such commands that may be issued by the playback device, a remote
server, a
user or the like). When other commands are to be implemented appropriate
actions in
accordance with the playback device are implemented in step 644, which might
include
advancing the playback timing, playback clock or counter; switching content
streams;
initiating playback of a different content stream; or other such actions. In
some instances,
following the implementation of the command the process returns to step 642.
In other
instances, the process 620 may optionally return to step 628 to continue the
playback
and/or initiate playback of a different content stream. When other commands
are not to
be implemented the process returns to step 640 to determine whether the
playback of the
supplemental content is complete. In those instances where the playback of the
supplemental content is complete the process 620 terminates and returns to
step 548 of
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process 520 to trigger the playback device to terminate the content place
holder duration
designated in the corresponding place holder clip information 160.
In some embodiments as described above and further below, the content place
holder duration and/or playback timing specified in the clip information 130
of the clip
information listing 126 associated with an identified place holder(s) 128
designates a
duration or playback that is larger or longer than an actual duration of
expected or
potential supplemental content. For example, the supplemental content
associated with a
place holder 128 can be a movie trailer to be played back in association with
a movie
recorded on the medium 222. By designating the place holder 128 on the medium
instead
of recording a trailer on the medium, an up-to-date and current movie trailer
of a soon to
be released movie, for example that includes an actor that is in the movie
recorded on the
medium 222, can be played back instead of an old movie trailer that was
relevant at the
time the contents 162 (e.g., the movie) were recorded to the medium 222.
Because the
duration of the future movie trailer is unknown at the time of recording the
content 134 to
the medium, the place holder allows the playback device to access the
supplemental
content, which may be produced at a much later date than when the content 134
is
recorded on the medium 222. Further, the actual duration of the current movie
trailer is
obtained from the additional source (e.g., server 326) and used to return
control to the
playback device upon completing the playback of the supplemental content,
which occurs
within the place holder duration specified in the place holder clip
information 130. For
example, the place holder clip information 130 may designate a duration for
supplemental content to be on the order of one hour, while the actual playback
duration
of a movie trailer may be about 60 seconds. As such, the movie trailer can be
played
back within the specified one hour duration and upon completion of playback of
the
supplemental content movie trailer, the duration specified in the clip
information 130 is
overridden and control is returned to the playback device.
In some implementations as described above and further described below,
supplemental content to be provided to the playback device 220 is broken down
or
segmented into a series or sequence of multiple segments, chunks or clips, and
the
segments, chunks or clips of content are then forwarded, typically
sequentially, to the
playback device. This reduces memory and/or buffer requirements of playback
devices,
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allows for the playback of relatively long content and allows for progressive
playback in
that the playback device can initiate playback of a segment while one or more
other
segments are being received.
Further, each segment of supplemental content has corresponding actual clip
information that, as described above, is information (e.g., an informational
file) that
describes details of the content file of the segment of supplemental content.
Many fixed
length standards and/or frameworks, however, have to know or receive all of
the clip
information files for all of the clips or segments for content on the medium
as well as any
supplemental content prior to beginning playback of content relevant to the
medium,
whether content recorded on the medium or accessed from a secondary source and
associated with the medium 222.
Some embodiments employ a predefined clip template that is expressed or
defined prior to segmenting the supplemental content into clips or segments.
Further in
some instances, the clip template can be defined on the portable storage
medium 222 at
the time the content 134 is recorded to the medium. The clip template can be
used to
dictate how the supplemental content is to be segmented into clips of
supplemental
content. The supplemental content, as such, is broken up to conform to the
predefined
clip template. Further, the clip template defines the clip information for
each clip prior to
the supplemental content being segmented into clips. Additionally in some
instances, the
clip template is used in encoding and formatting the supplemental content. By
applying
the clip template, the clip information for each clip of supplemental content
is known
prior to breaking down the supplemental content into clips.
Utilizing a clip template allows the clip information for each clip to be
recorded on the portable storage medium 222 or forwarded to a playback device
220 prior
to playback, and in some instances prior to generating the clips of
supplemental content.
As a result, the supplemental content does not have to be known or even exist
at the time
the clip information is recorded to the medium 222 or supplied to the playback
device.
Further, because the supplemental content does not have to exist at the time
the clip
information is recorded to the medium or provided to the playback device 220,
live
events can be distributed to playback devices as the supplemental content,
and/or
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supplemental content with undefined lengths can be playback at a playback
device 220
while the playback device still conforms with a fixed length standard or
framework.
Additionally or alternatively, the number of clips available to supplemental
content may be limited. For example, many specifications or standards limit
the number
of clips that can be included in a playlist and/or on a medium. As a specific
example, the
Blu-ray Standard, at least in some instances, limits the number of clips in a
playlist to 999
clips, while further limiting the number of clips on a Blu-ray compliant disc
to 4000. As
such, supplemental content with an unknown content length may result in a
number of
clips that would exceed the number of clips within a playlist and/or allowed
on a
medium. As a result, some embodiments utilize a replay, looping or repeating
playback
of clips. Specifically, a defined number of clips can be specified to be
repeatedly played
back until halted by a command or termination of content. As such, a playlist
with a
limited number of clips can be defined and the supplemental content can be
configured
according to a repeating of the number of clips when the supplemental content
has a
duration that exceeds a single playback sequence of the limited number of
clips.
Further still, because the predefined clip templates can be defined prior to
the
supplemental content being created or recorded, some embodiments are
configured to
include multiple clip templates defined to accommodate differing capabilities
of the
playback device 220 and/or communication links, accommodate different
supplemental
content with varying amounts of data, accommodate different encoding/decoding
bit rates
and other such factors. For example, a portable storage medium 222 can include
multiple
playlist 122 and associated clip information listing 126, where each playlist
corresponds
to a different clip template to accommodate differing playback devices,
parameters and/or
conditions.
Furthermore, a clip template can be configured for supplemental content at a
bit rate that is in excess of any expected bit rate of supplemental content
that is to be
segmented based on the clip template. As the supplemental content is broken up
into
clips as defined by the clip template the supplemental content may not fill or
fully occupy
the available data size of some if not all the clips defined by the clip
template. Some
embodiments compensate for the smaller data size of the supplemental content
by
padding clips of supplemental content generated in accordance with a clip
template with
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null data or data that is ignored by the playback device 220. Further, the
supplemental
content has a profile (e.g., number of bits relative to playback timing), and
the padding
can be incorporated to shift or move parts of the profile so that they align
with the
predefined place holder clip information. For example a series of zero bits, a
predefined
pattern of bits, a null packet or other such configuration can be incorporated
into the data
of relevant clips where appropriate to maintain timing.
Moreover, because the supplemental content is being delivered in segments
and/or chunks of data that match the place holder clip information the segment
boundaries may not align to an actual playback duration. As such, in some
instances, a
segment containing an end of playback may be padded out to the full segment
length to
stay in compliance with the place holder clip information and/or timing. For
example,
the padding can be in the form of null packets of data and/or additional
padding
following a series of packets within a clip. As one example, some
implementations
provide that integer numbers of packets are to be incorporated into each clip
that is to
receive padding, and in those instances where an integer number of packets
does not
complete fill a clip yet a subsequent packet would exceed the clip boundaries,
padding
data can be incorporated to fill in the remainder of a clip. Further as
described fully
below, the padding or null data can be defined relative to the supplemental
content but
not incorporated into the content. Instead, the playback device, by
identifying triggers or
instructions and/or utilizing a mapping, incorporates the padding or null data
at the
playback device. This allows for a reduced data size of the supplemental
content to be
transmitted to the playback device.
FIG. 7 depicts a simplified block diagram of a graphical representation of a
process for authoring a storage medium 222 and supplemental content 722 that
can be
obtained for playback in cooperation with the authored storage medium 222. In
some
embodiments, the authoring is implemented in two phases, a storage medium
package
phase 714, and a supplemental content or network package phase 716. An
authoring
application 724, such as Sony BIu-PrintTM, is employed to configure one or
more file
structure 120 (see FIG. 1) into an authored package 726 that is recorded to
the storage
medium 222 in the storage medium phase 714.
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In the supplemental content package phase 716, supplemental content 730 to
be accessed (e.g., by a playback device 322 from over a distributed network
324) and
played back in cooperation with the storage medium 222 is further configured,
in some
embodiments, through the authoring application 724 or other relevant
application to
separate out or chunk the supplemental content into chunks of content and
generate an
authored supplemental content package 732 comprising a series of chunks of
content 738
(.m2ts). In some instances, the supplemental content is divided or chunked in
accordance
with a selected chunk schedule 750. The authored supplemental content package
732
includes a playlist file (.mpls) 734, clip information files (.clpi) 736 and
transport stream
clips of supplemental content (.m2ts) 738, where the single playlist file 734
points to the
plurality of clip information files 736 and associated transport stream clips
738. The
playlist file 734 and clip information files 736, in some implementations, can
be
forwarded to the playback device 220 prior to initiating playback while the
clips of
supplemental content 738 can be downloaded prior to or at the time of playback
through
the playback device, for example, through streaming, a progressive download
(which in
some instances can emulate streaming of content) or other such methods.
Some authoring applications 724, however, cannot conveniently generate
and/or format supplemental content that can be readily downloaded and/or
progressively
downloaded. Similarly, some authoring applications 724 are incapable of
accurately
generating the authored supplemental content package that complies with a
predefined
clip template. In these instances, a conforming application (or series of
applications) is
employed to conform a preliminary authored supplemental content package 742
generated from the authoring application.
The preliminary authored supplemental content package 742 includes a
playlist file 744, a clip information file 746 and a transport stream of
supplemental
content 748. The conversion application 740 chunks or clips the clip
information file 746
and transport stream of supplemental content 748 in accordance with a chunk
schedule
producing the authored supplemental content package 732 with the playlist file
734 that
points to the plurality of chunked clip information files 736 and associated
transport
stream clips 738. The playlist file 734 and clip information files 736, in
some instances,
can be configured in one complete download that is utilized during an update
on the
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playback device 322, and when a user actually goes to playback content the
transport
streams of supplemental content clips 738 can be downloaded.
FIG. 8 depicts a simplified block diagram of a graphical representation of a
process for authoring a storage medium 222 and supplemental content 822 that
conforms
to a predefined clip template. The conforming with a predefined clip template,
in part,
allows the supplemental content to be conformed to a clip template that
corresponds with
a playlist on the authored storage medium 222 or at the playback device 220.
As such,
the supplemental content does not have to be known or created at the time the
authored
storage medium 222 is authored or the playlist is supplied to the playback
device.
Further, the conforming allows supplemental content to be played back in
association
with an authored storage medium even when the supplemental content does not
have a
defined length, such as user generated content (UGC), live content and the
like, which
can be streamed or downloaded to the playback device 220 for playback in
cooperation
with the authored storage medium 222. The process can include three phases,
the storage
medium package phase 714, a network package phase 816 and a content formatting
phase
818.
The network packaging phase 816 is used to generate place holders that are to
be supplied to the playback device 322 for use in playing back the
supplemental content
822. During the network packaging phase 816 the authoring application 724 is
used to
generate preliminary authored supplemental content package 842 that
effectively defines
a template that dictates the conforming of the supplement content 822, and
that can
include a playlist file 844, a template clip information file 846 and a
supplemental
content template transport stream 848 that is to be utilized in configuring
the
supplemental content 822. The conversion application 740 is used to generate a
converted playlist file 852 including the place holders that point to the
plurality of place
holder clip information files 854. Further, the conversion application 740
generates a clip
or chunk mapping 856 that is also used in configuring the supplemental content
822.
The content formatting phase 818 transcodes 860 the supplemental content
(e.g., captured video and/or audio content uploaded to some web server) to put
the
supplemental content 822 into a correct or desired elemental video and audio
format.
Using the template clip information 846 and template transport stream 848
generated in
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the network packaging phase 816 the transcoded supplemental content is
conformed
through a conformer 862 so that the supplemental content matches up with the
place
holder clip files 854 that are already onto the playback device 220 or are to
be
downloaded onto the playback device 220. In some instances, the supplemental
content
822 is incorporated into the template transport stream 848 where relevant,
replacing
portions of the content within the template transport stream while un-replaced
portions
are defined by null data or replaced by null data as fully described below.
A conversion application 864 is then implemented while applying the chunk
mapping 856 generated in the network packaging phase 816 to drive the clipping
or
chunking of supplemental content transport stream on the fly at the right
appropriate
points to divide it up into the clips of supplemental content 870. These clips
or chunks
870 can then be immediately forwarded over the network to the playback device
322, or
can be stored for later downloading.
FIG. 9 depicts a simplified block diagram of a conformer 862 according to
some embodiments. The conformer 862 includes a first parser 922, a first look
ahead
buffer 924, a compare and selection unit 926, a second parser 930, a third
parser 932, a
second look ahead buffer 934, a stream selector switch 936, and a packet
overwriter 940.
Inputs to the conformer 862 can include the transcoded transport stream 942 as
transcoded by the transcoder 860, a stream identifier (ID) parameter 944, the
template
clip information 846 and the template transport stream 848. Further, the
conformer 862
generates the conformed supplemental content transport stream 964.
The incoming transcoded supplemental content transport stream 942 and the
template transport stream 848 are applied in parallel to the first and second
look ahead
buffers 924, 934, respectively, to build up a navigational map of the incoming
streams.
These mappings provide maps of the streams and these mappings are supplied to
the
selection unit 926 prior to the corresponding portions of the streams so that
the selections
can be determined prior to actually implementing the selections as described
more fully
below. At least in part, these mappings provide flow through models of the
template
transport stream 848 and the incoming transcoded supplemental content
transport stream
942.
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Further, the incoming transcoded supplemental content transport stream 942
and the template transport stream 848 are respectively applied to the first
parser 922 and
the third parser 956 to extract metadata and/or parameters from the streams
and to
generate respective source packet maps 952 and 956. These parameters are
included in
each of the transport streams 942, 848, but are often difficult to access
and/or work with
because the streams are generally highly compressed. As a result, the
transport stream is
parsed to extract the parameters needed. The source packet maps can include a
series of
parameters that represent the individual packets that are used to build up the
actual
stream, and can include parameters such as, but not limited to, what the byte
positions
are; what the current times of those byte positions are; the presentation
times; encoding
times; for those packets that include payload whether the payload is audio,
video and/or
other content; whether the stream ID corresponds with a stream ID parameter
944 of
interest; and other relevant parameters.
Once the source packet maps 952, 956 are generated (typically built on the
fly) they are supplied to the selection unit 926 to be utilized, at least in
part, as the basis
to determine which packets of the template transport stream 848 are to be kept
and which
are to be replaced. As described above, prior to actually implementing a
selection
relative to the streams, the packet maps arrive at the selection unit 926
prior to applying a
selection algorithm to an associated packet. The selection unit 926 evaluates
a stream ID
to make sure that a stream being evaluated is a stream of interest (based on
received
stream ID parameter 944), information in template clip information file 846,
the entry
points 954 extracted by the second parser 930 from the template clip
information file 846
that define seekable points that the player can seek to within the particular
stream as these
seek points should be honored, and timing on the stream as it is received to
maintaining
the timing in an attempt to keep the timing the same (e.g., any particular
presentation
times of the map between the template transport stream 848 and the incoming
supplemental content transport stream 942).
As the supplemental content transport stream 942 flows through the
conformer 862 and the selection unit 926, based on the selection decisions
made, drives
the stream selector 936 to select between a packet of a template transport
stream 848, a
packet of the incoming supplemental content transport stream 942, or inserting
a null
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packet through the packet overwriter 940. In some instances the conformer 862
further
overwrites the presentation and decoding time stamps that were specified in
the incoming
supplemental content transport stream 942 with time stamps that are aligned to
the time
base of the template transport stream 848. The conformed supplemental content
transport
stream 964 is then forwarded to be further chunked and downloaded to the
playback
device 322 as described above and further below.
In some implementations, the conformer uses the template transport stream
848 to provide master timing. Packets in the template transport stream 848
with a stream
ID specified by the inputted stream IDs[] parameter 944 array are replaced
with either
packets with the same stream ID from the incoming supplemental content
transport
stream 942 or null padding packets. Decisions regarding when to replace a
packet from
the template transport stream 848 with a packet from the incoming supplemental
content
transport stream 942 versus a padding packet are based, at least in part, on
timing
comparisons between the template transport stream 848 and the incoming
supplemental
content transport stream 942. In some content formats or standards, such as
Blu-ray
ROM, a packet format is overlaid onto the general MPEG-2 transport stream
format,
defining a specialized form of a transport packet that is included called a
source packet
that contains an arrival time stamp. This packet is effectively a transport
stream packet,
that in some instances, has an extra four bytes in front of it that contains
copy protection
status of that packet and an arrival time stamp of that packet as it came into
the
multiplexor (parameter of Interest). This arrival time stamp can further aid
in the
comparison and selection of a packet, and can be used with both streams to
align the
streams to make sure that when the packet replacement is being implemented
that the
packet being replaced corresponds with a similar packet being inserted. The
template
clip information file 846 further specifies presentation time entry points 954
that are to be
honored during the packet replacement process to maintain compliance with the
clip
information placeholders on the playback device 322.
FIG. 10 depicts a simplified block diagram of a graphical representation of a
selection process 1020 in accordance with the selection unit 926 of the
conformer 862 in
accordance with the template clip information file 846. Shown are a series of
packets
1022 of a template transport stream 848, a series of packets 1024 of an
incoming
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supplemental content transport stream 942, and the resulting series of packets
1024,
1027-1028 of the conformed supplemental content transport stream 964. Based on
the
selections implemented by the selection unit 926, in accordance with the
timing, packets
are selected or padding or null packets 1027 are incorporated to produce the
conformed
supplemental content transport stream 964. The resulting conformed
supplemental
content transport stream includes some packets 1022 from the template
transport stream
848 (which might include one or more system packets 1028 and other such
overhead
packets), packets 1024 from the incoming supplemental content transport stream
942 and
some inserted null or padding packets 1027. The null packets provide padding
bits
between packets of content to, in part compensate, for the difference in
actual content
versus the template, to maintain timing, satisfy buffering requirements and/or
conform
with predefined clip information.
When incorporating the incoming packets of supplement content transport
stream 942 in compliance with the template clip information 846, the decoding
time
stamp (DTS) and presentation time stamp (PTS) timing can be adjusted to match
the
template transport stream 848. Further, in some instances, a packet arrival
time stamp is
taken from the template transport stream 848.
In some embodiments, when encoding the supplemental content transport
stream the configuration parameters of the incoming video stream should be set
to be
similar to or the same as configuration parameters for the template transport
stream 848
with the exception of at least bit rate. Additionally, positioning and/or
durations of GOP
(Groups of Pictures) and/or group of video access unit (GOVU) of the
supplemental
content transport stream 942 should correspond with, and in some instance be
identical to
the GOP/GOVU of the template transport stream 848 to allow presentation time
stamps
between the template transport stream 848 and the incoming supplemental
content
transport stream 942 to be appropriately compared.
Furthermore, the total number of bits between entry point presentation times
in the incoming supplemental content transport stream 942 is less than the
total number
of bits between corresponding entry point presentation times in the template
transport
stream 848. If not, the incoming supplemental content stream transport stream
942 will
not fit into the template transport stream 848 and/or adjustments to the
supplement
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content transport stream 942 would likely have to be employed (e.g., re-
encoding at least
a portion of the supplemental content transport stream to comply with bit
constraints).
For example, some implementations may use a factor of 1.5 in setting a mean
average bit
rate between the supplemental content transport stream 942 and the template
transport
__ stream 848. This factor may, in some instances, be adjusted or tuned, and
may also be
impacted by peak bit rates. Further, the granularity of entry points can be
spaced to
improve chances of fitting (e.g., the entry point granularity can be greater
than 1 second
apart, or in some instances greater than 2 seconds apart).
The selection unit 926 in selecting packets is driven by the template
transport
__ stream 848. For each packet from the template transport stream, the type of
the packet is
determined. In some implementations, system type packets (which are generally
overhead, describe the stream or the like) are maintained in the conformed
transport
stream 964 and selected by the selection unit 926, null packet are generally
replaced with
packets from the supplemental content transport stream 942 (e.g., audio,
video, private
__ style data, etc.). As described above, the time is further evaluated, and
in those instances
where timing between the template transport stream 848 and the supplemental
content
transport stream 942 do not match, a null packet can be selected and inserted.
Before selecting a packet the stream ID designated in the packet is evaluated
to confirm that the stream ID corresponds with a stream ID parameter 944. As
the
__ information flows into the selection unit 926, additional information in
the packet are
evaluated, such as a time stamp. In some instances, the packet is searched for
a
presentation time stamp, which is the timing associated with a give packet
designated
when it is expected to be presented on a display or through speakers during
playback. A
comparison is performed on the presentation time stamp of the template
transport stream
__ 848 and the presentation time stamp of the supplemental content transport
stream 942.
For example, for a packet of the template transport stream 848 the selection
unit 926
determines whether a corresponding packet, corresponding in presentation
timing and
having a matching stream ID to the stream ID parameter 944 being sought, can
be
identified in the supplemental content transport stream 942. Once a packet
from the
__ supplemental content transport stream 942 is identified that has a matching
stream ID to a
stream ID parameter 944, the presentation time is evaluated to determine
whether the
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packet corresponds in presentation time with the template transport stream 848
and
should be incorporated into the conformed supplemental content transport
stream 964. In
some embodiments, the selection is dictated, at least in part, confirming that
the
presentation times match, and if the presentation time align, then issuing a
selection
command to let the packet of the supplemental content transport stream 942
flow through
to the output. Alternatively when the presentation time do not align, a null
packet is
inserted because there is an insufficient bit rate in the incoming
supplemental content
transport stream 942 to match the template transport stream 848.
Referring back to FIG. 8, once generated the conformed supplemental content
transport stream 964 is further processed through the conversion application
864 applying
the chunk mapping 856 to generate clips or chunks 870 of supplemental content.
The
converted corresponding playlist 852 contains many play items pointing to a
separate
clip, and in some embodiments, each of those clips represent the granularity
of the
progressive downloads. In some instances, the chunking is performed in line.
As packets
are delivered from the conformer 862 they flow into the conversion application
or
component 864 that progressively converts the stream in accordance with the
chunk map
856. The clip information 854 can be utilized, in some implementations, to
generate the
corresponding clips 870 of supplemental content. For example, the clip
information can
dictate how many packets are in each clip, defined the start time and end time
of each
clip. As introduced above, a mapping 856 can be generated to provide a
convenient set
of data to work with, and can be used by the conversion application 864 when
generating
the clips 870 by taking the conform supplemental content transport stream 964
and
specifying which packet goes into which clip for which amount of time and/or
this many
bytes into the clip, designate an ending of the clip and closing the clip.
As described above, in some embodiments, integer numbers of packets are
incorporated into clips of supplemental content 870. In those instances where
an integer
number of packets cannot be incorporated into a clip to fill the clip, a
maximum number
of packets are incorporated without exceeding the bounds of the clip and the
remainder of
the clip is filled with null or padding data, to at least in part maintain
timing. Some
embodiments, when generating the clips honor align unit constraints, and as
such have to
include an integer number of packets into each clip. In those instances where
an integer
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number of packets cannot be incorporated into a clip to fill the clip, a
number of packets
are incorporated into the packet relative to an end time and the remainder of
the clip is
padded out with null or padding data to comply with the integer multiple of
the align unit.
For example, BD-ROM provides that each clip be integer divisible by 32
packets (6144 bytes). So if a segmented clip boundary does not meet that
parameter, then
null padding packets are added, typically, at the end of the clip. Further,
the null packets
incorporate the BD-ROM specialized arrival time stamp. This time stamp
advances at a
rate less than or equal to the quoted transport stream mux bit rate from null
packet to null
packet. This places a further restriction over choosing viable clip boundaries
because a
big enough time gap should be provided between the end arrival time stamp of
clip N and
the beginning arrival time stamp of clip N+1 to insert a series of null
packets where the
arrival time clock advances at a rate of the quoted stream transport stream
mux rate.
FIG. 11 depicts a simplified block diagram, according to some embodiments,
of a graphical representation of a process 1120 for segmenting a stream of
supplemental
content 1122 in accordance with a predefined clip template 1124 to generate
clips of
supplemental content 1126 conformed to the clip template 1124. The stream of
supplemental content 1122 is divided into packets 1024 and can be
substantially any
relevant supplemental content, for example, audio and video (AN) data. As
described
above with reference to FIGS. 7-10, the packets 1024 of supplemental content
are
transcoded, when needed, and conformed based on a template transport stream
848. A
conformer 862 generates a conformed supplemental content transport stream 964
that
may include template transport stream packets 1022, supplemental content
packets 1024
and/or null packets 1027. Based on the clip template 1124, the conformed
supplemental
content transport stream 964 is then segmented by breaking up the supplemental
content
into the clips of supplemental content 1126. Each clip of supplemental content
1126
includes one or more packets 1022, 1024, 1027. Further, padding bits,
packet(s) or data
1132 may be incorporated into one or more of the clips of supplemental content
1126
when an integer number of packets 1022, 1024, 1027 does not fill the clip. The
profile of
the resulting plurality of clips 1126 of supplemental content conforms to the
predefined
clip template 1124. As such the clips of supplemental content can be mapped to
the clip
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information at the playback device, and in some instances is provided to
satisfy buffering
requirements.
A dummy or hypothetical content stream can be used in generating the
predefined clip template 1124 and relevant clip information. This dummy stream
is not
distributed to playback devices, and instead is used to create the clip
template and clip
information file that has sufficient overhead or head room to allow
substantially any
expected supplemental content stream 1122 to be segmented in accordance with
the
profile of the clip template. A dummy stream can be encoded, for example, at a
bit rate in
excess of a bit rate of anticipated supplemental content to establish clips
with data in
excess of supplemental content data when encoded at a bit rate compatible with
playback
devices. This establishes at least in part the excess data size in the clip
template so that
the clips of supplemental content can correspond to the clip template and thus
the clip
information associated with the clip template.
Multiple different clip templates can be generated and one of the multiple
clip
templates can be selected, for example, depending on one or more factors such
as, an
expected or known playback device, communication link bandwidth and other such
parameters. The different clip templates produce different data streams at
different bit
rates, total bandwidths and the like that can be tailored based on different
communication
link bandwidths and/or speeds, playback device processing capabilities and
bandwidth
and other such factors. The portable storage medium 222 can include multiple
different
playlists with each playlist being associated with different playback
parameters, such as
communication links bandwidth and/or speed, playback device processing
capabilities,
other parameters or combinations of such parameters. In some embodiments, the
programming 142 on the medium 222 further includes programming that can cause
the
playback device 220 to implement an application to determine network
bandwidth,
device processing capabilities and/or other such parameters, and to select a
playlist 122
and relevant clip information recorded on the medium based on the determined
parameters. This selection can be forwarded to the server 326 or other remote
device that
can identify a predefined clip template that corresponds with the selected
playlist 122 and
forward supplemental content conforming to the identified predefined clip
template.
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Further in some instances, the supplemental content is encoded and/or
multiplexed (e.g., interleaving video and audio supplemental content together)
to meet a
particular set of buffer model requirements in attempts to ensure that the
encoded stream
of supplemental content can be played back through one or more particular
playback
devices and/or devices that comply with a particular playback standard or
framework,
such as a Blu-ray, HD DVD or other such compliant player. The encoding and/or
multiplexing interleaves content in attempts to ensure that the playback
device will not
overrun or underrun its buffers.
A dummy or hypothetical content stream can be used and encoded, for
example, at a relatively very high bit rate specification. This very high bit
rate is selected
to be greater than a bit rate expected for the supplemental content (for
example, greater
than bit rate for user generated content). The predefined clip template is
generated based
on this encoded high bit rate effectively creating a container into which
supplemental
content can be configured. By using the predefined clip template it is known
where the
packets and the like are going to be positioned along the stream.
Actual supplemental content, such as user generated content, is generated at a
lower bit rate, and often at a much lower bit rate than the hypothetical
content stream
used in generating the predefined clip template. When the encoded supplemental
content
stream 1122 is broken down into the clips 1126 the clip template 1124 provides
leeway
and flexibility to adjust the content 1130 within clips 1126 because the
amount of data of
the supplemental content 1130 being incorporated into a clip as defined by the
clip
template 1124 is less than (and in some instances significantly less than) the
data size
allotted for the clip by the clip template 1124. The supplemental content
within the clip
1124 is adjusted to align the supplemental content 1130 with the clip
template, in some
embodiments, by incorporating null or dummy data 1132 (e.g., preselected
series of bits,
string of one (1) bits or other such null data). The series of null or dummy
data 1132 are
skipped by or unrecognized by the playback device 322 in playing back the
clips 1126 of
the supplemental content (e.g., MPEG compatible decoding devices typically
skip
MPEG-2 13818-1 null packets).
As described above, the predefined clip template 1124 can be used to dictate,
at least in part, the encoding and/or multiplexing to generate a stream of
supplemental
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content clips 1126 that conforms with the predefined clip template 1124. As
such, the
encoded supplement content stream includes padding 1132 (e.g., dummy or null
data or
bits) aligning the content 1130 so that the clips 1126 of supplemental content
are in
compliance with the predefined clip template and correspond with clip
information on a
medium 222 or otherwise provided to the playback device.
The padding 1132 of a supplemental content stream, in some instances, can be
implemented by incorporating the dummy bits or data within the content stream
at
different layers in a hierarchy of a transport stream specification. For
example, padding
can be incorporated at the elementary layer and/or at the packet layer. As a
further
example, MPEG2 transport streams includes packets, and each packet is
identified for
storing one of video, audio, sub-pictures, graphics or the like. The padding
may be
incorporated by inserting null data, for example, into sub-picture data when
it is known or
determined that the packets need to be realigned. The null packets can be
incorporated at
strategic points so that the stream conforms to the predefined clip
information of the clip
template. For example, null sub-picture data could be incorporated into the
stream where
the null data is never accessed, available or displayed by the playback
device. Some
content streams can include and/or allow one or more secondary streams to be
included in
the multiplexing. As such, some embodiments additionally or alternatively
incorporate
some or all of the padding, for example at the packet layer, using another
secondary
stream as the padding.
In some embodiments, a hybrid strategy can be employed where initially the
supplemental content stream is encoded and multiplexed attempting to comply
with a
predefined clip template while erring on the side of caution. The encoded
content stream
can then be further adjusted by incorporating further padding to more
accurately and/or
precisely meet the predefined clip template. This hybrid application may be
utilized in
some instances where tighter bit rate demands are needed, for example, when
there is
limited memory space, attempting to reduce a download size and other such
instances.
It is noted that the incorporation of padding or dummy data 1132 results in
increased data sizes of clips of supplemental content and the transporting of
additional
redundant data. Attempts can be employed, in some instances, to try and
further reduce
the data size prior to transmission of the clips to the playback device. As
the
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supplemental content is passed through a multiplexor it typically is already
compressed
and incorporation of padding, as described above, is added to satisfy the
buffer
requirements and mapping to the predefined clip template information. Further
reductions in data size, however, may be obtained by passing the clips of
supplemental
content through a second level of compression. The subsequent content clips
can then be
decompress at the playback device before being recorded to the local storage
of the
playback device or otherwise utilized by the playback device. In some
embodiments, a
decompression application can be run from programming 142 on the portable
storage
medium 222.
Additionally or alternatively, the padding can be excluded from the clips of
supplemental content. The clips without padding can be forwarded to the
playback
device 220 and the playback device can then implement processing of the clips
to
incorporate padding into the clips. The padding at the playback device can be
incorporated, for example, by implementing, at the playback device,
programming 142
(e.g., Java code) from the portable storage medium, stored on the playback
device and/or
received from a separate source (e.g., through BDLiveTM applications). The
programming 142 can identify where the padding is to be incorporated based on
a
mapping or other indications in the content stream or provided separate from
the content
stream, and used to rebuild the content stream at the playback device 220 with
the
appropriate padding as needed.
Some embodiments may define the padding at the server 326 or other
processing facility by defining or added, through a run-length compressed
format,
additional start codes that define padding data that runs a specified length.
The playback
device 220 when playing back the clips detect the start codes and extend the
content in
accordance with the defined start code and specified length. Another method of
designating to a playback device where padding is to be incorporated is to
provide a
padding mapping or packet mapping to the playback device. The padding or
packet
mapping can define the padding for an entire content, or a packet mapping can
define
padding for just a portion of the content, such as for a single clip, a
grouping of clips or
some other portion of the content. Based on the packet mapping the playback
device can
incorporate the padding into the content prior to playback, and in many
instances prior to
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writing the content to local storage for use in playing back the content in
accordance with
the Blu-ray specification. This mapping can be forwarded as a separate file or
set of data,
for example, prior to receiving the content over separate channel or received
with the
content, such as in a header or otherwise prior to or with the content.
Allowing the playback device to incorporate the padding into the content
stream can greatly reduce the amount of data that has to be communicated to
the
playback device (e.g., downloaded), and can reduce the redundancies that occur
due to
the padding. For example, because of the variations in video content, the
instantaneous
encoding bit rate can dramatically vary, when encoding with a variable
encoding rate. A
video stream may have a nominal or average bit rate of 4 Mbits/sec., however,
at any
given point during the stream the encoding rate may jump, for example to 9
Mbits/sec.
because of rapid scene changes, and similarly may drop to as low as 1
Mbits/sec. In
order to allow and compensate for such fluctuations, a clip template would be
selected
that had an adequate capacity to deal with the incoming video that is being
conformed to
the clip template. As such, the selected clip template would have a high bit
rate, and
thus, would result in a large amount of padding (e.g., large numbers of
padding packets)
over a majority of the conformed content stream. Providing a packet mapping or
defining within the content stream where the padding is to be incorporated
will allow the
content stream to be transmitted without the transmission and communication of
large
amounts of redundant and null data. The playback device, instead, can
incorporate the
padding as defined within the stream (e.g., through start codes and defined
padding
lengths or numbers of packets) or through the packet mapping. Incorporating
the padding
into the content stream at the playback device additionally allows a clip
template to be
selected that can accommodate a larger range of encoding bit rates.
FIG. 12 depicts a simplified flow diagram of a process 1220 of segmenting
supplemental content 1130 into clips of supplemental content 1126. The
segmenting can
occur prior to receiving the request (e.g., pre-recorded content segmented
according to
one or more templates and/or encoding rates), or segmented at the time of
request and/or
with live content. In optional step 1222, a request to playback supplemental
content is
received over the network 324 from a playback device 322. In step 1224, the
supplemental content is identified and retrieved. In some instances the
supplemental
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content is retrieved as it is generated, for example, recording a live
performance,
production, event or the like. In step 1226, the relevant parameters and/or
characteristics
of the playback device and/or communication link are determined or a clip
template is
identified, for example a clip template specified by the playback device. As
described
above, the programming 142 in some instances provides code that induces the
playback
device 322 to determine its playback, processing and/or buffering
capabilities. Further,
the playback device 220 and/or programming 142 on the medium can cause a
selection of
a playlist that corresponds with a predefined clip template and/or clip
information
recorded on the portable storage medium and associated with the place holder
128. The
communication link can further affect the data flow to the playback device and
can be
used in adjusting the generation of the clips of supplemental content 1126,
selecting an
encoding rate relative to the selected clip template, and/or selecting
supplemental content
that has been segmented and prepared in advance and stored.
In step 1228, a predefined clip template 1124 is identified and selected in
accordance with the relevant parameters or designated template. In step 1230,
it is
determined whether supplemental content has been prepared in advance and is
available.
In those instances where the supplemental content has been prepared in
accordance with
the clip template and encoded according to the relevant parameters, the
process skips to
step 1234. The process continues to step 1232, when the supplemental content
has not
been prepared, where the supplemental content stream 1122 is encoded and/or
multiplexed in accordance with the selected clip template 1124 and the
identified
parameters (e.g., bit rates, communication bandwidth, etc.) to generate the
supplemental
content clips 1126 that include the supplemental content 1130 and in some
instances
includes the padding data 1132 where appropriate. Alternatively, the
supplemental
content clips 1126 are generated without the padding data 1132, but instead
include start
codes or other designators that, when detected by a playback device, will be
used by the
playback device to generate the padding data 1132 and incorporate the padding
data 1132
at the playback device as described above and fully described below. In yet
other
implementations, a packet mapping or null data mapping is generated in
cooperation with
the supplemental content clips 1126, to be used by the playback back device in
generating the padding data 1132 and incorporating the padding at the playback
device.
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In step 1234, a prepared set of supplemental content is selected based on the
identified template and other relevant parameters, such as network bandwidth
and the
like. In step 1240, the supplemental content clips 1126, and mapping where
appropriate,
are forwarded to the playback device 220. The process 1220 can be implemented
any
number of times, and in some instances simultaneously, for multiple different
relevant
parameters. For example, multiple playback devices 220 may be accessing a
source for
supplemental content (e.g., a live event such as a director's commentary) and
multiple
streams of supplemental content clips can be generated for different playback
devices
having different parameters. Further in some instances, steps 1222, 1224 and
1226 are
skipped and multiple different clip templates are selected in step 1230 and
used in step
1232 to generate multiple different streams of content clips. When playback
devices
request to access the content one of the multiple different streams of content
clips can be
selected in accordance with playback parameters and/or communication
parameters.
FIG. 13 depicts a simplified flow diagram of a process 1320 implemented by a
content source or supplier that can format supplemental content 452 associated
with a
portable storage medium 222, and in some instances forward the formatted
supplemental
content to a requesting playback device 220. For example, the content source
can be a
local or external memory 228 of a playback device 220, remote server 326 or
remote
memory storage device 328 coupled with and communicating with the playback
device
over a distributed communication network 324, such as the Internet, or other
such source.
Further, the process 1320 can be implemented by a content supplier that
formats the
content and distributes the formatted content to sources to be accessed by
playback
devices 220. The formatting can include, but is not limited to, formatting for
appropriate
communication when relevant, encrypting or applying other protection to the
supplemental content, compressing the content, segmenting the supplemental
content in
accordance with one or more clip templates when the content has not yet been
broken
down into the segments, re-segmenting according to other parameters, and other
relevant
formatting. In some embodiments, the process 1320 can be utilized in
cooperation with
the process 1220 of FIG. 12.
In step 1322, the content source (e.g., server 326) receives a request for
supplemental content to be played back in association with a medium 222 at a
playback
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device 220. In step 1324, the medium 222 at the playback device is identified,
and in
some embodiments, authenticated. The authentication can be through
substantially any
authentication process as are known in the art. In step 1326, it is determined
whether
authorization to forward the supplemental content is needed. In those
instances where
authorization is not needed the process skips to step 1334. Alternatively,
step 1330 is
entered to determine whether authorization is received. The authorization may
be based
on information provided by the playback device 220, a user profile, a
verification of
payment received, authorization from a third party device (e.g., a third party
server
associated with an owner of content of the supplemental content and/or content
recorded
on the medium), a password, and/or other such authorizations. In those
instances where
authorization is not verified the process issues a notification, in step 1332,
to the playback
device and terminates.
In step 1334, the requested supplemental content 452 is identified, typically
based on the identity of the medium 222 and/or content recorded on the medium.
Other
factors can also be taken into account in identifying the supplemental
content. For
example, the template; encoding parameters, such as when multiple streams are
available
that are encoded at different rates; a user profile can be considered when
determining the
supplemental content to supply, such as, identifying supplemental content
appropriate for
a user's age, identifying prior supplemental content previously received, a
level of service
for which a user has paid (e.g., a basic level versus a premium service), and
the like; a
level of authorization can be evaluated (e.g., a user may have paid a lower
fee for a first
supplemental content, while a higher fee could have been paid to obtain one or
more
alternate or further supplemental content); capabilities of the playback
device can be
considered (e.g., whether the device can received streamed content, providing
high
definition video content when the playback device is capable of utilizing such
content,
etc.); network characteristics (e.g., network bandwidth); and other such
factors.
Once the supplemental content has been identified, the process 1320 continues
to step 1336 to retrieve and/or generate metadata and/or actual supplemental
content
information (e.g., actual playback duration, actual playback timing and other
such
relevant metadata), and forward the metadata when available to the requesting
playback
device. In optional step 1338, processing and/or formatting of the
supplemental content
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is performed when processing is needed. This processing can include generating
the clips
of supplemental content (e.g., implementing process 1120 and/or 1220 described
above
with reference to FIGS. 11 and 12), encrypting, formatting and/or packaging
the clips for
communication based on a communication protocol and other such processing. As
described above, in some instances the clips of supplemental content may be
prepared in
advance according to one or more templates and/or encoded according to one or
more
different encoding rates and/or schemes. When the supplemental content has
been
preprocessed, step 1338 can be skipped or the processing in step 1338 may be
limited, for
example limited to formatting according to a specific communication channel,
encrypting
or other such processing. In step 1340, a transfer of the supplemental content
is initiated.
In those instances where padding data is to be generated and incorporated into
the
supplemental content at the playback device 220, the transfer of the
supplemental content
in step 1340 can include forwarding a packet mapping or other such indications
to the
playback device, when the padding information is not incorporated directly
into the
content stream, so that padding can be generated at the playback device at the
appropriate
locations within the content stream.
In step 1342, the transfer of the supplemental content is monitored to
determine whether adjustments are to be made. These adjustments can be based
on
changes to the communication link, instructions from the playback device or
other such
changes. When adjustments are to be made step 1344 is entered to implement
appropriate adjustments, and the process 1320 returns to step 1340 to continue
the
transfer as adjusted in accordance with determined appropriate adjustments.
The
adjustments can vary depending on conditions of the communication link and/or
bandwidth, actions by the user, and/or other such factors. In some instances,
the
adjustment can include a stream switching. By employing a single template and
encoding the same supplemental content using the single template while
applying two or
more different encoding rates to produce a plurality of different streams of
the same
content at different rates, a stream switch to a lower or higher bit rate can
be implemented
without altering the playback or requiring the playback device 220 to reboot,
restart,
implement an update (e.g., an update to the virtual file system (VFS)) or
other such
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updates; or a switch to a completely different supplemental content can be
implemented
where the different supplemental content is conformed to the single template.
The process 1320 continues to step 1346 to determine whether additional
metadata, commands, supplemental content information and/or actual clip
information is
to be forwarded to the playback device. For example, additional metadata may
be known
based on completing an encoding of the supplemental content, a media stop
command
may be communicated, packet mapping designating at least padding locations and
amounts of padding to be inserted by the playback device and be defined, or
other such
information. Step 1350 is entered when further metadata, other relevant
information or
command(s) are to be forwarded, and the further metadata, other relevant
information or
command(s) is communicated to the playback device. In step 1352, it is
determined
whether that the supplemental content has been completely transferred. When
the
transfer is not complete, the process 1320 returns to step 1340 to continue
the transfer.
Alternatively, the process 1320 terminates.
FIG. 14 depicts a simplified flow diagram of a process 1420 of distributing
supplemental content from remote sources (e.g., a server 326 or remote digital
storage
328) to a playback device 220. In some embodiments the process 1420 can be
incorporated as part of the process 1320 described above. In step 1422, it is
determined
whether the supplemental content is to be downloaded or streamed to the
playback
device. In those instances where the identified supplemental content is to be
downloaded
to the playback device, step 1424 is entered to determine whether one or more
clips or
segments of the supplemental content are to be generated. In some instances,
the
supplemental content may have already been broken down into a plurality of
clips or
segments 1 126 of supplemental content to be forward. Step 1426 is entered
when clips of
the supplemental content are to be generated and based on one or more
parameters the
supplemental content is processed to initiate the generation of clips of
supplemental
content. The parameters can include buffer size of the playback device 220,
bandwidth
of the communication network, processing speed and/or capabilities of the
playback
device, playback rates and/or bit rates of the playback device and content
being played
back, the amount of supplemental content to be forwarded, identified
predefined clip
template and other such relevant parameters. The process 1420 continues to
step 1430
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following step 1426 and when it is determined in step 1424 that the
supplemental content
does not have to be broken down into clips, where transfer of a clip or file
of
supplemental content is initiated. Similarly, step 1432 is entered when the
content is to
be streamed where the streaming of the content is initiated.
In step 1434, the process determines whether adjustments to the transmission
(e.g., transmission rates) or retransmission of a clip or a portion of the
streamed content is
to be implemented. The adjustments and/or retransmissions can be based on
feedback
received from the receiving device or error conditions detected. In step 1436,
retransmission is initiated. In step 1440, it is determined whether further
clips are to be
transmitted. When further clips are to be transferred the process 1420 returns
to step
1430 to initiate the transfer of a subsequent clip of supplemental content.
Alternatively
the process continues to step 1442 where it is determined whether all of the
supplemental
content has been delivered to the playback device. In those instances where
further
supplemental content is to be forwarded the process returns to step 1432 to
continue to
deliver the supplemental content. When it is determined that all of the
supplemental
content has been forwarded step 1444 is entered to determine whether further
metadata or
other relevant information is to be forwarded to the playback device. Step
1446 is
entered to initiate the transfer of further metadata or other relevant
information in those
instances where further metadata or other relevant information is to be
transferred.
As described above, in some implementations the null or padding data is not
incorporated into the supplemental content at the content source and is not
communicated, for example over a network 324, to a playback device. Instead,
the
supplemental content is conformed to a selected template and data defining the
placement
of where the padding packets 1027 and/or padding data 1132 is to be
incorporated and an
amount of padding to be incorporated is identified. A separate padding or
packet
mapping is generated or padding designations are incorporated into the content
stream,
such that the packet mapping and/or padding designations identify where
padding is to be
incorporated and how much padding is to be incorporated. The playback device
utilizes
this packet mapping or padding designations to incorporate the padding at the
playback
device to be stored in local memory at the playback device prior to being
played back.
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By not implementing the padding at the content source, the amount of data to
communicate the supplemental content is reduced.
The generation of padding at the playback device 220 can be implemented
through software retrieved from the portable storage medium 222, local storage
228
and/or received from over the network 324 (e.g., through BD-LiveTm). This
software
application can be implemented through substantially any relevant programming,
such as
Java, or any other relevant programming that can run in the playback device
environment
and that interprets the packet mapping and/or padding designations (e.g.,
start code)
within the stream. Using the mapping and/or padding designations the playback
device
can determine where to fill out the padding (e.g., based on timing) and how
much
padding to incorporate. A resulting content stream, after the incorporation of
the padding
at the playback device, is ready for playback, and in some instances, can be
written into
local storage ready for playback. In other implementations, such as in some
streaming
implementations, the padding information may not be actually written into the
content
stream by the playback device, but instead utilized as timing information.
Alternatively,
however, some implementations utilize and incorporate the padding within the
content
stream to comply with clip information at the playback device and/or of the
medium, and
preserve an integrity between the content stream and a clip information map.
Still
further, the padding, can in part, be incorporated into the content stream to
maintain
buffer levels and maintain timing.
FIG. 15 depicts a simplified flow diagram of a process 1520, implemented
through the playback device 220, of generating padding at the playback device
according
to some implementations. In step 1522, communication is established with a
source of
supplemental content, such as a remote source 326. In step 1524, the playback
device
220 authenticates and/or provides authorization of itself and/or of the
portable storage
medium 222 when requested by the remote source. In step 1526, a request for
the
supplemental content is forwarded to the remote source 326. This request can
include
providing an identification of the portable storage medium 222, identifying
prior
supplemental content, identifying a user and other such information that can
be utilized
by the content source in identifying supplemental content as described above
and further
below. In step 1528, it is determined whether a confirmation is received that
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supplemental content is available and is to be communicated. In those
instances where
there is no supplemental content the process 1520 terminates.
In step 1530, it is determined whether a packet mapping is received. As
described above, in some instances, the packet mapping can be forwarded over
the same
or a different communication channel. Further, the packet mapping may only be
a partial
mapping for a subset of the supplemental content. When a packet mapping is not
received, the process continues to step 1534. Alternatively, step 1532 is
entered where
the packet mapping is parsed and an initial location and amount of padding is
identified.
In step 1534, supplemental content is received. In step 1536, the
supplemental content is initially processed. This initial processing may
include some
initial decompression, decoding, decryption and/or other such pre-processing.
In step
1538, the content stream is parsed. In step 1540 it is determined whether one
or more
padding identifiers are detected within the stream designating that padding is
to be
incorporated into the content stream. The padding identifier can be defined,
in some
instances, as a start code that specifies padding with a defined length,
runtime, number of
packets, number of bytes or the like.
When the content stream includes a padding identifier, step 1542 is entered to
determine the location where the padding is to be incorporated into the
content stream
and an amount of padding to be incorporated. In step 1544, the playback device
begins to
locally record the supplemental content stream. In step 1546, the content
stream is
monitored while writing the supplemental content stream and it is determined
whether
padding packets or data is to be incorporated at a current location within the
supplemental
content stream as defined by the packet mapping and/or padding identifier. In
those
instances where padding is not to be incorporated, the process continues to
step 1548 to
determine whether additional supplemental content is received and/or is to be
recorded
locally. In those instances where no further supplemental content is being
received the
process 1520 terminates.
When further content is received or to be recorded the process returns to step
1544 to continue recording the content stream. When it is determined in step
1540 that
padding is to be incorporated at an identified location within the
supplemental content
stream, step 1550 is entered where the playback device 220 generates the
specified one or
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more padding packets and/or padding data, and incorporates the padding into
the
supplemental content stream. In step 1552 the generated padding is record
within the
content stream, including the padding packets and/or data. The process then
continues to
step 1554 to determine whether further supplemental content is received and/or
is to be
recorded locally. In those instances where no further supplemental content is
being
received the process 1520 terminates. Alternatively, the process returns to
step 1530 to
again evaluate the packet mapping when available, determine whether additional
packet
mapping is received for portions of the content not mapped by previous packet
mapping,
and/or continues to step 1536 to see whether further padding identifiers are
specified.
The content stream received at the playback device, in some instances, is
effectively a reduced or compressed stream because some or all of the null
packets have
been removed. The playback device then reinserts the null packets, and thus,
needs to
know where to insert the null packets. In some instances, a packet mapping
identifies
locations within the stream where the null packets are to be incorporated.
Additionally,
when the playback device is inserting more than one null packet, the playback
device in
some instances identifies timestamps (e.g., ATC timestamps) to be used for
each null
packet. For example, each null packet can be configured as a source packet,
which can
be a BD-ROM construct that has an extra four (4) bytes that contains the
timestamp. As
such, the playback device has to determine or be provided with the timestamp
to
incorporate the timestamp in the packet to reconstruct a content stream, for
example, that
complies with the BD Specification.
FIG. 16 depicts a simplified flow diagram of a process 1620 to incorporate
padding into a content stream at the playback device, in according to some
implementations, with the use of one or more packet mapping files, where a
packet
mapping file can be associated with a single clip or chunk, multiple chunks or
an entire
content stream. In step 1622, it is determined that a particular clip of
content is to be
retrieved. For example, it can be determined in step 1622 that the particular
clip is to be
downloaded in accordance with a clip information file during a progressive
download. In
step 1624, the playback device 220 retrieves or accesses an associated packet
mapping
file. This associated packet mapping file can be received from a remote source
prior to
implementing playback or during the progressive download.
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In step 1626, the packet mapping file is parse to identify the locations
(e.g.,
byte regions) where padding is to be inserted, and where appropriate to
identify a source
packet timestamps (e.g., an ATC timestamp). In step 1630, a playback
application
downloads of the stream data for the particular clip. In step 1632, the
playback
application processes, parses and/or evaluates the content stream relative to
the packet
mapping as the stream is received and buffered. In step 1634, it is determined
whether
one or more null packets are to be inserted into the content stream based on
the byte
region being evaluated. In those instances where null packets are not to be
incorporated
the process 1620 continues to step 1636 to determine whether further content
for the
particular clip is to be evaluated. In those instances where further content
is to be
evaluated the process returns to step 1632 to continue to process the content.
When it is
determined that the clip has been evaluated step 1640 is entered to determine
whether the
content stream comprises further clips and that further clips are to be
downloaded and
evaluated. When additional clips are to be retrieved the process returns to
step 1622 to
retrieve further clips of content. Alternatively, the process 1620 terminates
and/or returns
to the playlist to continue the playback in accordance with the disc 222.
When it is determined in step 1634 that one or more null packets are to be
incorporated into the content stream, step 1642 is entered where the packet
mapping file
associated with the particular clip is evaluated to determine a number of null
packets to
be incorporated into the content stream relative to an identified byte region
and the
relevant number of null packets are incorporated into the content stream. In
some
instances an ATC timestamp is additionally set in accordance with the parsed
packet map
producing a reconstructed stream for the particular clip. Additionally or
alternatively, the
null data can be extracted from a null template stream and incorporated into
the content
stream as described below. In step 1644, the reconstructed content stream is
written to
local storage on the playback device. The process 1620 then continues to step
1636 to
determine whether further content for the particular clip is to be evaluated.
In some instances, the packet mapping file defines regions of bytes into which
padding is to be incorporated. Further, the packet mapping file defines a
number of null
packets to be incorporated within the region. The null packet data can, in
some
implementations, be constant and held in memory as a constant on the playback
device to
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be readily copied and incorporated into the content stream. Below is a partial
sample of
an example packet mapping file according to some implementations.
<?xml version="1.0" encoding="utf-8" ?>
- <paddingMap aacs="false" atcDelta="846" numBlocks="454">
<null pos="66432" count="250" atc="314627436" />
<null pos="66624" count="25" atc="315651096" l>
<null pos="67008" count="345" atc="315757692" />
<null pos="199104" count="27" atc="328685418" />
<null pos="208128" count="32" atc="330848640" />
<null pos="211008" count="30" atc="331983126" />
<null pos="216192" count="25" atc="333130302" />
<null pos="219456" count="28" atc="334243638" />
<null pos="224640" count="25" atc="335391660" />
<null pos="225024" count="43" atc="336439008" />
<null pos="226944" count="43" atc="337592952" />
<null pos="268416" count="21" atc="343282302" />
<null pos="270912" count="32" atc="344361798" />
<null pos="273984" count="36" atc="345470904" />
<null pos="276672" count="31" atc="346618926" />
<null pos="280128" count="34" atc="347732262" />
<null pos="283200" count="29" atc="348879438" />
<null pos="287232" count="63" atc="349997004" />
<null pos="295104" count="56" atc="352278666" />
<null pos="301056" count="9" atc="354492648" />
<null pos="301248" count="52" atc="354530718" />
<null pos="2839872" count="37" atc="13841972" />
<null pos="2842752" count="37" atc="14989148" />
<null pos="2845440" count="31" atc="16119404" />
<null pos="2848704" count="69" atc="17258120" />
<null pos="2852928" count="5" atc="19489022" />
<null pos="2853888" count="64" atc="19527092" />
<null pos="2857920" count="35" atc="21732614" />
<null pos="2861568" count="33" atc="22867946" />
<null pos="2863488" count="35" atc="23984666" l>
<null pos="2866368" count="42" atc="25103078" />
<null pos="2868288" count="30" atc="26258714" />
<null pos="2871360" count="69" atc="27359360" />
<null pos="2877120" count="77" atc="29619872" />
</paddingMap>
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In this example, the packet mapping file is defined in accordance with an
XML format. It is noted, however, that the packet mapping file can be
implemented in
substantially any relevant format that can be parsed by the playback devices
to accurately
identify where the null data is to be incorporated and an amount of null data
to
incorporate, such as text file or other parsable formats. Similarly, the
arrangement,
layout or organization of the packet mapping file can be varied from the above
example
to substantially any arrangement that allow accurate extraction of the
relevant
information to incorporate the padding.
Additionally, in this example, the "null pos" parameter defines a position
within the stream where one or more null packets are to be incorporated. This
location or
position parameter can define a byte position, a byte number, time codes or
other such
parameter that can accurately identify a location within the content stream
where the one
or more null packets are to be added. Further, the position parameter can
define a
position relative to the clip, the entire content stream or other such
relation, for example,
the position can define a byte position within the clip. A "count" parameter
defines the
number of null packets to incorporate at the identified location. In this
example, the
mapping additionally includes an "atc" parameter that defines a timestamp for
a first null
packet of the one or more null packets to be incorporated at the identified
position. In
some instances, a single timestamp is identified for the one or more null
packets and the
timestamp for each successive null pack of the "count" is incremented
according to a
known timing, for example, based on the timing of a packet. In some instances,
this
known timing is defined. In the example packet mapping above, the known timing
is
defined by the "atcDelta" parameter, which in this example defines a timing of
846. As
such, in this example, each successive packet added has a timestamp equal to
the prior
timestamp plus the known period (846 in this example). As a specific example,
the first
entry of the example packet mapping file above defines that 250 null packets
are to be
added at byte position 66432, and that the timestamp for the first null packet
of the 250
null packets is 314627436 (which in this example is based on a 27 MHz clock
cycle). A
second null packet would then, in this example, have a timestamp of 314628282
(i.e.,
314627436 + 846). The output result would be a fully reconstructed stream that
could
then be written to local storage.
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Still further, the padding can be incorporated by the playback device without
the packet mapping file using alternative schemes to define where to
incorporate padding
and how much padding to incorporate. For example, an alternative scheme
defines a new
private extension start code at the transport stream layer to carry the packet
mapping data,
which in some instances is essentially the same as in the example packet
mapping file
above. In yet other implementations, a convention (protocol) is established
between a
server or source 326 and the playback device 220 where a predefined set of the
clip, such
as the opening bytes of a stream clip are defined and known to be packet
mapping data.
The playback device then parsed these opening bytes first to extract the
packet mapping
data. Data that follows the packet mapping data in the opening bytes is then
the actual
stream data with the padding removed. Still other embodiments can implement
the
scheme as a true run length encoding algorithm using a symbolic scheme. This
may be
very general and may also be processor intensive on the playback device side.
In some embodiments, the null data is grouped instead of being distributed
over a clip. The positioning of the null packets can be moved so that null
packets are
grouped together, and in some instances grouped together as much as possible
within the
confines of the buffer model and T-STD delay constraints of the transport
stream. This
grouping provides, in some instances, better data compression for download.
Within a transport stream that utilizes start codes, some embodiments utilize
a
defined start code or newly defined extension start code at the transport
stream layer that
is detected by the playback device notifying the playback device that null
packets are to
be incorporated. A playback device can include some pre-processing of the
content
stream to detect the defined start code and then identify the amount of null
data to be
incorporated. A data can define the amount of null data or number of null
packets to
incorporate, which can include similar information as specified in the example
mapping
file above. Alternately, a convention or protocol can be defined between a
content source
326 and a playback device 220, where one or more opening bytes of a stream
clip are
known to be packet mapping data. The playback device parses the one or more
opening
bytes to extract the packet mapping data. Data that follows the opening bytes
is then the
actual content stream data with the padding removed. This allows padding to be
incorporated by the playback device to be defined within the content stream.
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Additionally or alternatively, some embodiments may employ run length encoding
algorithm using a symbolic scheme by evaluating the content to identify
repeated patterns
of null packets, and encoding based on the identified repeated patterns.
Some embodiments additional group padding or packets to improve
compression. During encoding, the content stream is processed to optimize the
grouping
of the null packets with defined constraints. These constraints can include
encoding the
content stream to comply with a buffer model of an intended playback device,
transport
standard target delay (T-STD) constraints and other such constraints and
limitations of
the transport stream and playback device that may limit the amount of grouping
of the
null packets. By grouping the null packets a better data compression for
download may
be obtained.
In many instances, the content received from the remote source 326 is
encrypted or other protection is applied to the content. Further, many
standards require
that the content played back in association with a medium be encrypted or
otherwise
protected. This protection often must additionally be maintained for
supplemental
content received from a remote source and written to local storage before
playback, and
thus, the supplemental content is often in an encrypted or otherwise protected
state when
received and recorded to the playback device. As a result, in some
implementations the
incorporation of the padding packets and/or padding data into the supplemental
content
stream at the playback device includes incorporated null packets that are
encrypted or
otherwise protected in accordance with the content stream and/or encrypting or
otherwise
applying some protection scheme to the padding packets and/or data to
correspond with
the supplemental content stream. A playback device 220, however, may not have
or may
not have access to the encryption keys. Similarly, with some protection or
encryption
techniques variables may be utilized, such as timestamps, as part of the
encryption key or
other protections. For example, the Blu-ray Standard dictates the use of
Advanced
Access Content System (AACS).
Again, the BD format specification defines a stream where the 188 byte
packets of the MPEG2 13818-1 Transport Stream are augmented with 4 byte
headers
containing: two copy protection indicator bits, and 32 bit ATC timestamp. The
combined
192 bytes is termed by the BD specification as a source packet. The packets
are then
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further organized into groups of 32 to form an aligned unit. The AACS copy
protection
applied in accordance with BD proscribes that encryption should be applied
using the
AES 128 algorithm with a chained block cipher option (CBC). The chaining
mechanism
creates a dependency of AES 128bit block "n" on block "n-l". As a result,
block "n-1"
typically needs to be decrypted before block "n" can be decrypted.
This encryption algorithm is to be applied to the aligned units independently.
Further, the first 16 bytes of the aligned unit are to be left unencrypted.
The encryption
key or "block" key is created by encrypting the first 16 bytes of the aligned
unit using
AES 128 with a CPS unit key (or title key). The result is the block key for
which the first
16 bytes of the aligned unit acted as a seed. The remaining 16 byte (I28bit)
blocks of the
aligned unit are then encrypted with the block key.
As such, the encrypted result cannot be predicted because each source packet
contains an ATC time stamp that is changing from packet to packet. Even if
every block
of the aligned unit is padding data the encrypted result typically cannot be
predicted (and
therefore signal) because each source packet contains the ATC time stamp,
again which
is changing from packet to packet (marking time). The encryption algorithm is
strong so
there is almost no discernible correlation between the unencrypted aligned
unit of
padding and the encrypted output. As such, the playback device may be unable
to
effectively incorporate padding packets and/or data into a content stream that
could
accurately be played back.
Some embodiments provide for encrypted content while still allowing padding
to be incorporated into the content stream at the playback device 220 by
employing a null
template stream. The null template stream contains null data configured in
accordance
with the playlist 120 that is to be accessed by and utilized at the playback
device 220 in
playing back content. Further, the null template stream can be conformed, and
chunked
when appropriate, to directly correspond with and align with a content stream.
As such,
the playback device can extract one or more null packets and/or aligned units
from the
null template stream and insert the extracted one or more null packets or
aligned units
back into the content stream as dictated by, for example, the packet mapping
file or other
such padding designations.
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In generating the null template stream, the aligned units would correspond and
align with aligned units of an expected content stream when the null template
stream and
the content stream are conformed and/or chunked in accordance with the same
clip
template and/or chunk schedule. As such, null packets or aligned units
extracted from the
null template stream and inserted into a content stream comply with the
content stream
and can result in a fully compliant content stream to be played back by the
playback
device.
In some embodiments, the null template stream is generated by creating a null
content stream that comprises null packets, and typically is full of null
packets with no
substantive content (e.g., no video or audio content). The null content stream
can be
further chunked and conformed into aligned units and encrypted or otherwise
protected in
accordance with a protection scheme to be utilized in protecting the actual
content steam
that is to be supplied to and played back by the playback device in accordance
with the
playlist 120. The conformed and chunked null content stream produces the null
template
stream.
For example, a null content stream can be conformed through the conformer
862 in association with a template (e.g., template transport stream 848).
Similarly, the
conformed null content stream can be chunked in accordance with a chunk
schedule
resulting in the null template stream that will correspond with a content
stream that is
conformed and converted when the same template and chunk map is applied. The
null
template stream, however, will comprise a series of null packets and/or
aligned units that
can be extracted and inserted into a content stream while maintaining timing
and
complying with protection schemes applied to the content stream.
Again, prior to forwarding the content stream to the playback device the
content source can pull the null aligned units or packets from the content
stream reducing
the amount of data that is to be transferred. Aligned units and/or packets of
the null
template stream will correspond with the null aligned units or packets pulled
from the
content stream and can be reinserted by the playback device in accordance with
the
packet mapping into the content stream to reconstruct the content stream
including the
null data. This null template stream preserves the integrity of the content
stream, such as
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preserving ATC timestamp values, the system packet positions and the like,
providing a
reconstructed content stream that can be compliant with a given standard.
A single null template stream can be utilized for any number of content
streams when the content streams are processed in accordance with the same
clip
template and the null template stream. Subsequent content streams can reuse
the null
template stream to incorporate null packets where needed.
In some implementations the null template stream is repeated in accordance
with the playlist. This allows the null template stream to be kept at a size
that is more
readily downloaded and/or occupies less memory. In instances where the content
is
relatively long a corresponding null template stream would similarly be long.
A long null
template stream may be inhibitive, for example, in supplying it to a playback
device due
to download times. By repeating a single null template stream the size of the
null
template stream can be limited while allowing its use with content streams of
substantially any length. Further, in repeating the use of the null template
stream in the
same playlist, the playlist can continue with substantially any length while
the playlist is
conformed according to the relatively short repeating null template stream.
Additionally,
a relatively short null template stream could be readily merged directly into
local storage
or loaded into memory of the playback device 220.
Further, the repeated use of a null template stream within a single playlist
can
accommodate multiple different configurations for cooperating the content
stream. For
example, the repeating of a null template stream can be utilized with both
"connection
condition 6" and "connection condition 5" as defined in accordance with the
Blu-ray
standard. Both conditions are meant for seamless connections between
PlayItems, which
in some instance are aligned units, where connection condition 5 defines a
discontinuous
stream played back seamlessly, while with connection condition 6 the stream is
continuous and both an arrival time clock and system time clock are
continuous. Because
the aligned units connected through a connection condition 5 are
discontinuous, the two
connected aligned units can be treated as independent streams, where timing is
effectively reset between aligned units. In utilizing a connection condition
5, a relatively
short null template stream that is reused from one connection boundary to the
next can
continuously be used in an on going basis. In some instances, the length of a
null
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template stream can be equivalent to a longest clean break to clean break
segment of a
content stream, which could comprise one or more chunks.
In some implementations, the null template stream can be configured to define
a single chunk, or in some instances a single GOP. Repeating a null template
stream for
each chunk can reduce processing overhead because processing would not have to
look
up which part of the null template stream is being used because it would be
known as the
byte positions would be the same from chunk to chunk.
FIG. 17 depicts a simplified flow diagram of a process 1720, implemented by
a source that produces the portable storage medium 222 or a content source
(e.g., server
326), in producing a null template stream that can be utilized by a playback
device 220 in
incorporating null data into a content stream. In step 1722, a server side
content template
stream is produced by chunking and conforming a representative content stream.
In some
embodiments, the representative content can include a representative audio,
video and/or
other relevant content that is representative of content to be later forwarded
to a playback
device to be played back in cooperation with the portable storage medium 222,
while in
other embodiments, the representative content can be the actual content
intended to be
forwarded to the playback device. In still other embodiments, the
representative content
can be substantially any content that is similar to the content intended to be
forwarded to
the playback device. The server side content template stream, in some
instances, is
produced with attempts to optimize the compression while complying with buffer
models
and/or other constraints, by in part grouping the audio and video packets
together within
the constraints of the specification and expected playback device parameters
to increase
the likelihood of large numbers of sequential null packets.
Again, in some instances, the server side content template stream can be
generated as a relatively short content stream, and further can be limited to
a single
chunk. In step 1724 it is determined whether the server side content template
stream is
shorter than a selected playlist (e.g., a playlist on an associated portable
storage medium
222). In some embodiments, the server side content template stream can
additionally or
alternatively be compared with a length of a content stream that is to
actually be
forwarded to a playback device or a length of an anticipated content stream.
In those
instances where the server side content template stream is not shorter the
process 1720
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advances to step 1730. Alternatively, step 1726 is entered where the server
side content
template stream is replicated a number of times and concatenated producing a
single
concatenated server side content template stream such that the single
concatenated server
side content template stream has a length that at least equals or is longer
than the playlist
(and/or content stream where appropriate). In step 1730, the server side
content template
stream or concatenated server side content template stream is then processed
to conform
and chuck the server side content template stream. In some instances, for
example where
connection condition 5 connections are applied, the conformer 862 can
compensate for
the timing between repeated server side content models, for example, by
resetting a
timing between each connections. From the perspective of the conformer 862,
the
concatenated server side content model looks like a single long server side
content
template stream, but the long server side content template stream may be
composed of a
series of short server side content template stream.
In step 1732, a null template stream is created using the server side content
template stream as a base and replacing the video and audio packets within the
server
content template stream with null packets and retaining the system packets
(and/or other
header, overhead or other such packets). As a result, the null template stream
contains
system packets in appropriate positioning and aligned units that contain null
data. In step
1734, the null template stream is protected, such as encrypted, AACS encrypted
or
otherwise protected using the same protection scheme that is to be applied to
an actual
content stream. In step 1736, the null template stream is recorded to a
portable storage
medium 222, or otherwise forwarded (e.g., downloaded, progressive downloaded
or the
like) to the playback device 220. As a result, the encrypted null template
stream resides
at the playback device 220, where the encrypted null template stream
corresponds with a
content stream to be received at the playback device, allowing the playback
device to
extract packets and/or aligned units of null data from the encrypted null
template stream
to be inserted into corresponding positions within the content stream as
dictated by a null
packet mapping or other designations as described above. One or more null
template
streams can be maintained and/or used by a playback device. In some instances,
however, a single null template stream can be utilizes with multiple different
content
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streams, where the different content streams to be supplied to the playback
device are
processed to conform to the null template stream available at the playback
device.
Still referring to FIG. 17, in step 1740, an appropriate null template stream
is
indentified. Again, a content stream is to be conformed so that it corresponds
with the
null template stream at the playback device 220. For example, the playback
device can
provide the content source with an identification of a null template stream
retained at the
playback device, the content source can select a null template stream based on
one or
more parameters (e.g., the content stream to be processed) or other such
identification. In
step 1742, the content source conforms and chunks a content stream in
accordance with
the server side content template stream, and thus, the null template stream.
In step 1744, the conformed content stream is protected applying the same
protection scheme applied to the corresponding the null template stream. In
step 1746,
the null packets and/or null packet aligned units are removed from the content
stream,
and a null packet mapping file is generated or other null designations are
incorporated
into the content stream. In step 1750, the compressed content stream is
forward to the
playback device (e.g., downloaded, progressive downloaded, streamed or
otherwise
delivered). The resulting content stream corresponds with the null template
stream at the
playback device such that null packets or aligned units removed from the
content stream
can readily be reinserted from the null template stream by the playback device
220. It is
noted that one or more steps of the process 1720 can be performed by different
sources.
For example a first content source can produce the null template stream (e.g.,
a source
that produces and distributes portable storage mediums 222), while an
alternative source
can perform steps 1740-1750 in conforming, protecting and distributing a
content stream
that conforms with the server side content model.
FIG. 18 depicts a simplified flow diagram 1820, implemented by a playback
device 220, to incorporate null packets into a content stream in accordance
with some
embodiments. In step 1822, the playback device 220 detects that a content
stream is to be
received from a remote source. In step 1824, the playback device identifies a
null
template stream to be coordinated with a content stream. In some instances,
the content
source provides a null template stream identifier. Alternatively, the playback
device can
supply to a content source an identification of a null template stream stored
at and/or
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accessible by the playback device. In yet other instances, the playback device
220
receives the null template stream from the content source, which is typically
received
prior to receiving some or all of the content stream, but could be received
after receiving
some or all of the content stream.
In step 1826, the playback device receives at least a portion of the content
stream. In step 1830, the playback device determines whether null data is to
be
incorporated into the content stream. Again, this determination can be based
on a packet
mapping, null data designations or other such indications where null data is
to be
incorporated. When null data is not to be incorporated, the process advances
to step 1834
where the portion of the content stream is stored. Alternatively, when null
data is to be
incorporated step 1832 is entered where one or more aligned units and/or
packets are
extracted from the null template stream and incorporated into the content
stream as
defined by the packet mapping and/or other designation. The process then moves
to step
1834 to store the portion of the content stream including the incorporated
null data. In
step 1836, it is determined whether further portions of the content stream are
received.
When further portions of the content stream are received the process returns
to step 1826
to process the received portion of the content stream. Alternatively, the
process
terminates.
As such, the playback device reconstructs the full stream by inserting aligned
units or packets of null data for appropriate positions from the null template
stream
according to the null packet mapping or other designations. Further, the
aligned units or
packets inserted by the playback device can be pre-AACS encrypted (or other
such
protection can be applied), and thus, have correct ATC timestamps and system
packets.
The resulting constructed stream can therefore be fully compliant with a give
standard
and/or protection scheme. This allows the integrity of the protection scheme
to be
maintained and enhancing the entropy associated with the protection.
Alternatively, a default encryption key can be utilized during portions of the
content stream where padding is to be implemented by the playback device,
where the
playback device has or is provided with the default encryption key for those
potions to
allow the playback device to encrypt and incorporate the padding. In other
implementations one or more packets (e.g., clumps of 32 transport packets) can
be pre-
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encrypted, for example with a known or predefined encryption key, and provided
to the
playback device allowing the playback device to incorporate a specified number
of the
one or more pre-encrypted packets where appropriate. Additionally in this
implementation, the content source can identify those portions of the content
stream
where padding is to be incorporated by the playback device and these
identified portions
can be encrypted according to the predefined encryption. In yet other
implementations,
the content source disables or does not apply protection to those portions or
packets of
the supplemental content where padding packets and/or data is to be
incorporated by the
playback device.
Other alternative schemes can be employed, however, many of these
alternatives may not be fully compliant with a give standard (for example, not
using
encryption for a portion of the content and using a default key would not be
fully
compliant with the Blu-ray Standard). These non-compliant schemes, however,
may
allow the playback device to incorporate the padding packets and/or data where
the
resulting supplemental content written by the playback device 220 to local
storage (e.g.,
storage 228 or 229) could then be effectively played back by the playback
device without
inducing errors. Many playback devices often do not verify that a content
stream is fully
compliant with a give standard, specification or protocol.
As introduced above, some embodiments additionally allow for stream
switching. The use of clip templates that conform to clip information at the
playback
device 220 (e.g., defined on a portable storage medium 222 or communicated to
the
playback device) additionally allows some embodiments to switch from one
content
stream to another without adversely affecting the playback and without
requiring the
playback device to reboot, restart, implement an update (e.g., an update to
the virtual file
system (VFS)) or other such updates. For example, a single clip template is
utilized to
encode a single content stream at different bit rates. Typically, a playback
device can
only playback a single content stream that is exclusively configured according
to the clip
information defined on the portable storage medium. Further, a playback device
typically
only gets one chance, prior to playing back content, to set up the stream that
is to be
played back in accordance with the clip information defined on the portable
storage
medium or otherwise received prior to setup. In order to switch from one
stream to
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another stream, the playback device would ordinarily have to go through a
reboot, restart
and/or an additional virtual file system update, which would interfere with
the playback.
By utilizing a single clip template scheme and conforming model, the content
stream can be encoded multiple times applying different encoding rates or
parameters for
each encoding. The playback device can then switch between these various
content
streams without the need for a virtual file system update or a restart because
the clip
information is the same for each content stream. As a result, a playback
device 220
and/or a content provider 326 can select the best possible playback experience
for a
playback device, by identifying the highest possible bit rate for that
playback device,
which may be limited for example by the bandwidth of the connection to the
playback
device (e.g., cable, DSL, modem, wireless, etc.), and thus, select an encoding
bit rate that
corresponds to the maximum available bit rate to the playback device. This
allows the
playback device and/or source provider to adaptively switch the input video
stream
conforming to the same clip template depending on an actual connection.
Additionally
when multiple clip templates are defined on the portable storage medium, the
playback
device and/or the content source can select the clip template that will
satisfy the highest
possible bit rate, and then allow for switching during playback between the
content
streams that have been conformed into that selected clip template adaptively
depending
on varying conditions, such as an actual connection and/or variations on the
connection.
To allow for this content stream switching, a number of streams are prepared
in advance, when the content is pre-recorded, or prepared simultaneously or
substantially
simultaneously if the content is to be played back live or substantially live.
These
pluralities of prepared streams all conform to the same clip template, and
then the
playback device and/or content source can switch between the streams to
achieve a
desired playback experience.
The switching between streams allows a transition between a single content
that has been encoded at two or more different bit rates, or switching between
different
content. For example, a communication bandwidth may change during a transfer
of the
supplemental content stream from an initial bandwidth determination. As a
result, the
playback device may be unable to effectively receive and decode the content
stream or
may be able to receive a higher bit rate content stream. By encoding the
content stream
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using a single clip template but at varying bit rates and/or applying varying
parameters, a
content source may switch between content streams without adversely affecting
playback.
Similarly, by encoding two or more different content streams according to the
same clip template, playback can be switched between these different content
streams.
Because the playback device is already accessing and utilizing the relevant
clip
information that is applicable to both streams, the streams can be switched
without a
restart, reboot, updating the VFS and the like. This can provide something
similar to a
channel switch in response to input from a user, the playback device and/or as
dictated by
the content source and/or content provider. Additionally, with live content,
as introduced
above, multiple encoders can be employed to encode at different rates. The
playback
device, in some instances, can adaptively instruct the content source to
select an
appropriately encoded stream and/or have the stream conformed to the clip
template on
the fly.
In some implementations when switching between streams, the playback
device can identify a clip file at a point along the stream where a switch is
to occur and
notify the content source 326 supplying the supplemental content of the
identified clip
file allowing the content source to retrieve the relevant portions of the new
content
stream. Typically, this selected and identified clip file is to be played back
at some time
in the future so that there is sufficient time to receive the new content
stream from the
content source and prepare it for playback. Other timing and conditions can
also be
communicated between the playback device and the content source to coordinate
the
switch.
Alternatively or additionally, a playback device 220 can have the
functionality
and/or logic, either stored locally or retrieved from the portable storage
medium 222, to
select, retrieve and/or switch between streams encoded at different rates. The
playback
device 220 determines its current download performance conditions and based on
that
determination further determines whether it needs to select a lower or higher
bit rate or
could improve performance by selecting a lower or higher bit rate. Upon
identifying a
stream or determining that a switch to a different stream should be
implemented, the
playback device 220 can notify the content source requesting the appropriate
stream. In
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some instances, the playback device constructs an appropriate reference (e.g.,
URL) from
which to start downloading the selected stream clip. In some instances, the
playback
device can request a listing of potential streams, their relevant encoding
rates or other
parameters, and corresponding reference from which to retrieve the content. In
some
embodiments, the playback device 220 queries a web service API to retrieve a
list of
stream resources and associated URLs. Some existing progressive download
applications
provide a listing of sources, and as such the playback device's query can be
enhanced to
specify which stream rate is desired. Additionally or alternatively, the
results to the
query can be enhanced to additionally specify which stream rate is associated
with
different sources allowing the playback device to select an appropriate
reference in
accordance with a desired rate.
FIG. 19 depicts a simplified flow diagram of a process 1920 implemented by a
playback device 220 to select a content stream in accordance with a selected
rate and to
switch to a subsequent stream having a different rate. In step 1922, a
playback device
220 requests a list of available streams and associated rate. In some
instances, the
available streams in this context are the conceptual full length streams that
are not
chunked but represent the different rates. In step 1924, the playback device
measures
parameters, such as connection speed or bandwidth and download (or streaming)
performance and other such parameters. In step, 1926, the playback device
evaluates the
determined connection speed along with the capabilities of the playback device
(e.g.,
buffer capabilities, processing capabilities and the like). In step 1930, the
playback
device 220 selects, based on the evaluation in step 1926 (or in steps 1940 or
1942 as
described below), an appropriate stream rate. In step 1932, the playback
device requests
the resource for a clip or chunk of the selected content stream having the
identified rate.
In step 1934, it is determined whether further clips are to be retrieved. In
those instances where further clips are not to be retrieved the process
terminates and/or
returns to the play list upon download of the current clip. When further clips
are to be
retrieved (e.g., downloaded or streamed), step 1936 is entered where the
playback device
220 continues to monitor connection speed and download performance while
receiving
the clip. In step 1940, it is determined whether conditions degrade and/or the
playback
device is incapable of keeping pace with the currently selected content stream
(e.g., a
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buffer and/or cache begin to fill or exceeds a threshold level). When
conditions have not
degraded when a subsequent clip is to be requested, the process advances to
step 1942.
Alternatively, in those instances where conditions have degraded the process
returns to
1930 to identify a content stream that has a lower rate corresponding with the
degraded
conditions to select upon selection of a subsequent clip.
In step 1942, it is determined whether conditions improve and/or the playback
device is capable of processing content at a higher rate (e.g., a buffer
and/or cache begin
to empty or fall below a threshold level). When conditions have not improved,
the
process 1920 returns to step 1932 to continue requesting a subsequent clip in
accordance
with the prior selected rate. Alternatively, when conditions have improved,
the process
returns to step 1930 to identify a content stream that has a higher rate
corresponding with
the improved conditions for one or more subsequent clips. As a result, the
playback
device 220 is capable of monitoring connection conditions and downloading
performances, and uses these results to control rate selection for future
clips of content to
provide an adaptive stream switching system and functionality.
As described above, some playback devices are incapable of receiving actual
streamed content. This may be due to limitations of the playback device (e.g.,
limited
buffer size), limitations due to the playback device conforming to a standard
or protocol,
or other such factors or combinations of factors. For example, according to
some
standards, such as the Blu-ray Disc Standard, a playback device cannot accept
streamed
content, and instead, has to receive all of the supplemental content or an
entire clip of
supplemental content prior to initiating playback, and further typically has
to have all of
the clip information for the supplemental content (including clip information
for all clips
when the supplemental content is broken into multiple clips) prior to
initiating playback
of content from the medium 222 and/or the supplemental content. Again, some
present
embodiments break down the supplemental content into clips or segments 1126
and allow
a clip or segment to be fully received so that the playback device 220 can
initiate
playback of the received clip while one or more subsequent clips are being
received. In
providing clips of supplemental content to a playback device, some embodiments
attempt
to reduce and/or eliminate delays in initiating playback of supplemental
content at the
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playback device by providing initial clips of supplemental content that are
relatively
small in data size and/or short in playback duration.
FIG. 20 depicts a simplified graphical representation of a portion of a clip
template 2020 that is employed in defining clip information and segmenting of
supplemental content 452 to be forwarded, for example from a server 326 over
the
Internet 324, to a playback device 220. A first clip 2022 is defined to
generate a clip of
supplemental content having a first data size 2024 and first duration 2026. In
some
instances, the data size 2024 is representative of the supplemental content of
a clip as
well as other overhead data where needed (e.g., packaging, protection, error
correction
and the like). A second sequential clip 2032 is defined following the first
clip 2022. This
second clip 2032 is defined to generate a clip of supplemental content having
a second
data size 2036 that is greater than or equal to the first data size 2024 of
the first clip 2022,
and a second duration 2038 that is greater than or equal to the first duration
2026 of the
first clip 2022. Similarly, a third sequential clip 2042 is defined with a
data size 2044
and duration 2046 that are greater than or equal to the data size 2036 and
duration 2038,
respectively, of the second clip 2032. Subsequent clips can continue this
pattern of
equivalent or progressively increasing data size and/or durations. For
example, a fourth
clip 2052 can define a data size 2054 and duration 2056 that are equal to or
greater than
the data size 2044 and duration 2046 of the third clip. The clips of
supplemental content
generated in accordance with the clip template 2020 are prepared such that
physical size
and duration (or runtime) of successive clips progressively increase on a clip
by clip
basis.
The data size and duration can continue to be increased for substantially any
number of successive clips. Typically, the data size and/or duration are
limited by the
buffer size of the playback device 220 and/or other such factors. Similarly,
there may be
an optimal data size and/or duration for providing the continued playback of
the
supplemental content. As such, the data size and/or duration of subsequent
clips may
become constant. For example, a fifth and successive clips may have data sizes
and/or
durations that are substantially equal. The number of clips that continue to
increase in
data size and/or duration can depend on numerous factors, such as data
transmission
rates, playback device capabilities (e.g., decoding, decryption, buffer size,
processing and
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other such processing capabilities), amount of data processing need at the
playback
device, signal quality, user preferences, and other such factors. For example,
the sizes
and durations of clips may be based on speed and stability of typical network
downloads,
proximity in presentation time to common seek points, acceptable latency in
starting
playback from a give seek point, overhead associated with initiating and
handling
downloads, and other relevant factors. Similarly, the amount of increase in
data size
and/or duration between successive clips can also depend on numerous factors,
such as
data transmission rates, playback device capabilities, amount of data
processing need at
the playback device, signal quality, user preferences and other such factors.
By defining the first clip 2022 with a relatively small data size and
relatively
short duration, a first clip of supplemental content conforming to the first
clip 2022 of the
template 2020 can be fully received and processed by the playback device 220
(e.g.,
decryption when needed, decoding, evaluation of the clip information and
rendering)
within a relatively short time. This relatively short response time allows the
playback
device 220 to begin playing back the first clip of supplemental content with
limited or no
delay. While the first clip of supplemental content is being played back, a
second clip
generated in accordance with the second clip 2032 of the template 2020 is
being received
and processed at the playback device 220. In some instances, the second clip
is fully
received and processed prior to the termination of the playback of the first
clip of
supplemental content such that the playback device can immediately and
seamlessly
begin playing back the second clip upon fully playing back the first clip.
Similarly, a
third clip of supplemental content generated in accordance with the third clip
2042 of the
template 2020 can be received and processed by the playback device 220 prior
to
completing the playback of the second clip, again allowing seamless transition
and
playback of the third clip. This provides a streamed appearance to the content
during
playback, and in particular provides the streamed appearance when the playback
device is
not capable (whether functionally or due to conformity to a protocol or
standard) of
receiving actual streamed content.
FIG. 21 depicts a simplified graphical representation of a clip template 2120
according to some embodiments that can be employed in generating clip
information and
segmenting supplemental content to be forwarded, for example from a remote
data
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storage 328 over the Internet 324, to a playback device 220. A first clip 2122
of the clip
template 2120 is initially generated and/or defined with a first data size
2124 and/or first
playback duration 2126. A plurality of subsequent clips defined and/or
generated with
successively increasing data sizes and/or progressively increasing playback
durations.
For example, second, third and fourth clips, 2130, 2136 and 2142 each are
defined and/or
generated with successively increasing data sizes 2132, 2138, 2144,
respectively, with
progressively increasing playback durations 2134, 2140, 2146, respectively, as
described
with respect to FIG. 20. Substantially any number of sequential clips with
progressively
increasing data sizes and/or playback durations can be utilized. In some
instances,
however, the data size and/or clip information become constant.
Further shown in FIG. 21 is the detection of an event, flag or trigger 2150.
This trigger 2150 can be substantially any trigger that indicates a change of
status, change
of playback location, a selection of one of a plurality of playback paths, a
selection of a
menu option, detected error in transmission and/or other such triggers. For
example, a
trigger 2150 can be an action by the user requesting a change in playback of
the
supplemental content, such as a request to advance the playback of the
supplemental
content to a subsequent chapter point, advance forward a predefined duration
of playback
time within the supplemental content or other such user actions.
The trigger 2150 defines a transition or adjustment to the clip template 2120,
according to some embodiments, such that a subsequent fifth clip 2154 of the
clip
template 2120 following the detection of the trigger 2150 has a reduced or
relatively
small defined data size 2156 and/or duration 2158. For example, the data size
2156
and/or duration 2158 can be less than the data size 2144 and/or duration 2146,
respectively, of the fourth clip 2142. In some instances, the data size 2156
and/or
duration 2158 of the fifth clip 2154 are approximately equal with the data
size 2124
and/or duration 2126, respectively, of the first clip 2122.
Because of the change of status, the fifth clip 2154 is generated with a
reduced
data size 2156 and/or duration 2158 so that the clip of supplemental content
generated in
accordance with the fifth clip 2154 of the clip template 2120 is received
relatively
quickly following the event 2150 and processed at the playback device 220,
allowing the
playback device 220 to continue playback of the supplemental content with
reduced
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delays following the event 2150. Clips following the adjusted fifth clip 2154
can
continue, in some implementations, to successively increase in size and
duration as
described above. For example, a sixth clip 2160 can define a data size 2162
and/or
duration 2164 that is greater than or equal to the data size 2156 and duration
2158 of the
fifth clip 2154; a seventh clip 2166 can define a data size 2168 and/or
duration 2170 that
is greater than or equal to the data size 2162 and duration 2164 of the sixth
clip 2160; and
an eighth clip 2172 can define a data size 2174 and/or duration 2176 that is
greater than
or equal to the data size 2168 and duration 2170 of the seventh clip 2166.
Subsequent
clips following the eighth clip 2172 can similarly have data sizes and/or
durations that are
greater than or equal to those data sizes and durations of prior clips. Again,
factors may
be such that the clip sizes and/or durations become substantially constant for
subsequent
clips.
FIG. 22 depicts a simplified block diagram of a process 2220 according to
some embodiments to generate a clip template, e.g., template 1124, 2020, 2120,
that can
be used in processing and/or generation of clips of supplemental content
according to
some embodiments. In step 2222, a data rate and/or rate of transmission is
selected,
identified and/or determined. Again as described above, the rates can depend
on many
factors including the communication link bandwidth, processing capabilities of
the
playback device and other such factors. In step 2224, a buffer size of the
playback device
is identified (e.g., extracted from the request for the additional content).
In step 2226, a
desired fixed clip data size and/or duration is determined for clips following
a number of
clips having progressively increased data sizes and/or playback durations.
This fixed size
again can dependent on, but is not limited to, buffer size, the processing
capabilities of
the playback device, communication bandwidth, and other such factors.
In step 2228, a number of clips of supplemental content having progressively
increasing data size is determined based at least on the data and/or
transmission rates and
the buffer size of the playback device. Typically, the number of clips with
progressively
increasing data size and/or durations attempts to provide a rapid initial
playback of the
supplemental content and continued playback of the supplemental content
without delays,
pauses or freezes fames due to buffering and/or processing.
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In step 2230, a data size or playback duration is determined for each of the
number of clips determined in step 2228 to have progressively increasing data
sized
and/or durations. Again as described above, the data size and/or duration can
depend on
one or more factors such as, but not limited to, playback device processing
capabilities,
communication bandwidth, and other such factors. In step 2232, a clip is
defined having
the data size and/or duration determined in step 2230, and clip information
for the first
clip is generated. In some instances, a dummy or hypothetical content stream
is encoded
and/or multiplexed in accordance with the defined clip. Clipping or chunking
of content
strategies is based, in some embodiments, on selecting a suitable trade off
between
content presentation quality and download speeds. Once the clipping strategy
has been
selected it is typically fixed by the place holders unless the place holders
are updated
prior initiating downloading of the supplemental content. Further, alignment
of
download supplemental content can be maintained, in some instances, by a file
naming
strategy, such as incrementing file numbers. The file name numbering can be
defined
such that they match the place holder clip information file name numbering
(e.g.,
10000.clpi, 10001.clpi, 10002.clpi ..., correspond with 10000.m2ts,
10001.m2ts,
10002.m2ts ..., respectively).
In step 2234, it is determined whether clip information has been generated in
accordance with each clip having progressively increased data sizes and/or
durations.
When the progressively increased clips are not all defined, the process
returns to step
2232. Alternatively, when the clip information has been generated in
accordance with
each clip having progressively increased data sizes and/or durations the
process continues
to step 2236.
In step 2236, one or more clips are defined having the fixed clip data size
and/or duration and the clip information is generated. In step 2238, it is
determined
whether a trigger 2150 is to be incorporated. In those instances where a
trigger is to be
incorporated the process continues to step 2240 to identify the trigger. The
process then
returns to step 2228 to determine a number of clips to define having
progressively
increased data size and/or playback durations taking into consideration the
clips
previously defined as well as an expected state of playback at the playback
device and the
trigger detected. The resulting clips of supplemental content correspond with
the place
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holders 128. When a trigger is not to be incorporated, the process 2220
continues to step
2242 to determine whether clips for the entire potential supplemental content
have been
defined. In those instances where further clips are to be defined, the process
2220 returns
to step 2236 to define a subsequent clip and clip information. Alternatively,
the process
2220 terminates.
The present embodiments allow variable length supplemental content to be
cooperated with a medium that complies with a fix length framework or
standard, and
can include the playback of supplemental content that does not have a known
length
including supplemental content that is generated substantially at the time of
distribution
to one or more playback devices 220 to be played back in cooperation with
content
recorded on the medium 222. Additionally as described above, the number of
clips
available in segmenting supplemental content may be limited, for example, by a
limited
number of clips in a playlist and/or defined for a given medium. As such,
supplemental
content with an unknown content length may result in a number of clips that
would
exceed the number of clips within a playlist and/or on a medium.
To accommodate content with unknown lengths, some implementations
attempt to utilize clip information with a timing that exceeds, and typically
far exceeds,
an expected length and/or timing of the actual content stream to be played
back in the
future in cooperation with the medium 222. Some embodiments additionally or
alternatively utilize a replay or repeating playback of clips. Specifically, a
defined
number of clips can be specified to be repeatedly played back until halted by
a command
or termination of the supplemental content. As such, a playlist with a limited
number of
clips can be defined and the supplemental content can be conformed to a
template
according to a repeating of the number of clips when the supplemental content
has a
duration that exceeds a single playback sequence of the limited number of
clips.
The looping of the clip information can allow the playback of substantially
any content with substantially any length. For example, content lasting over
12 or even
48 hours or more could be played back in cooperation with a portable storage
medium
222 even though such content would likely exceed the allowable clips in a
playlist and/or
clips allowed on the portable storage medium. As such, a playlist can be used
as a
circular back drop with a limited and fixed number of clips, such that during
playback
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when the playback device reaches the end of the clip files the playback device
simply
returns to a beginning or defined clip file and continue to playback. This
looping
essentially provides an endless supply of clips. In such an implementation,
the
supplemental content is similarly conformed in accordance with the limited
number of
clips. Again, the playlist is used as a circular back drop in conforming the
supplemental
content to the clip template, and as the content is conformed when the
conforming device
reaches the end of the clips, the conforming device simply returns to the
beginning or a
defined clip and continue to conform the supplemental content. As such, the
supplemental content can be continuously played back in accordance with the
limited
number of clips defined on the portable storage medium 222.
The playback is monitored and based on the playback the appropriate clip of
actual content is supplied in accordance with the clip information that is
being repeated or
looped. In some instances, the playback device forwards the playback timing
along with
the request for a clip of content to the content source, and the content
source then utilizes
this playback timing to identify the correct clip to be associated with the
looped clip.
Some embodiments employ one or more algorithms to select the correct content.
These
algorithms can be implemented at the content source 326, for example, through
a web
service API to determine an appropriate next clip to be played back. A
playback device
220 can forward a request to the source for a next clip, passes up a next clip
ID, and in
some instances additionally forwards information about playback, for example,
an
elapsed presentation from zero at that point. The content source utilizes the
information
provided to look and/or identify an actual clip to be forwarded. For example,
the source
can identify a URL for the clip from a table which contains presentation time
for each
clip, player Clip ID and URL. As a further example, a short playlist contains
four clips
(e.g., clip IDs: 00001, 00002, 00003, 00004). A table can then be accessed to
identify a
corresponding clip. Table 1 below shows an example of a table of the associate
data in a
repeating application.
PTS Clip ID Resource Path
0.0 00001 /titlename/00001.mts
20.0 00002 /titlename/00002.mts
40.0 00003 /titlename/00003.mts
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60.0 00004 /titlename/00004.mts
80.0 00001 /titlename/00005.mts
100.0 00002 /titlename/00006.mts
120.0 00003 /titlename/00007.mts
140.0 00004 /titlename/00008.mts
160.0 00001 /titlename/00009.mts
TABLE 1: Example Source Content
The information utilized by the content source (e.g., a table) may
additionally
identify a server clip ID or other information to coordinate the looped
playback.
Similarly, an index can be provided and by counting identifiers (e.g., 0001,
0002, 0003,
etc.) and looking it up through the index, identify an appropriate content by
time region
or other such coordination.
The server would indentify a corresponding clip of actual content in
accordance with the elapsed time of the presentation being greater than or
equal to a
current entry presentation time stamp (PTS) and less than a next entry PTS.
The source
can then verify that a clip ID in the entry is the same as that being
requested by the
playback device 220. If not, the source identifies that an error has occurred
(e.g., the
table is inconsistent, the playback device calculation of elapsed presentation
time is
incorrect or other such errors). The source can then take appropriate actions,
such as
requesting verification from the playback device, issuing an error to the
playback device,
requesting additional information from a user at the playback device or other
such
actions.
In some implementations, it is additionally advantage to using a limited
number or fewer numbers of clips. For example, a limited number of clips can
result in a
relatively significant reduction in time needed to write those clips and/or
clip information
to local storage 228 in setup and/or during the virtual file system
processing. Further,
fewer clips means managing fewer clips, which in many instances can reduce
overhead,
improve performance, and can result in a more responsive user experience.
Further, some embodiments always use a restricted number of clips regardless
of an expected supplemental content, an amount of supplemental content and/or
a
playback length of the supplemental content. For example, a fixed number of
clips, such
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64 clips, can be defined and the playback is set to repeat or loop over these
64 clips until
terminated as described above. The content is similarly conformed to these 64
clips in a
looping pattern regardless of the length of the supplemental content. This
avoids the
need to anticipate the length of content, can avoid exceeding number of clips
restrictions,
may provide for simplified management, improved performance and other results.
To compensate for timing parameters and attempting to ensure sequential
playback, including during seeking, rewinding, fast forwarding and the like, a
counter
and/or an algorithm is employed in some embodiments. For example, a counter
can track
each return to the beginning clip as the content is conformed and/or played
back. A
mapping may be provided in advance and/or as the content is delivered defining
the
counting (e.g., metadata can be provided to prescribe mapping between streams
on the
content supplier and playlists on the player). This counting enables a correct
clip stream
data to be pulled down for the right clip information file during conforming,
playback
and/or seeking. For example, clip streams can be numbered, and modular
arithmetic
based on the numbering of the file names would be performed during configuring
and/or
playback.
FIG. 23 depicts a simplified flow diagram of a process 2320 implemented by a
content source or provider, e.g., source 326, in generating clips of a
supplemental content
stream in accordance with some embodiments. The process 2320 can be
implemented,
for example, as part of step 1232 of process 1220 and/or step 1426 of process
1420.
Further, in some implementations some or all of the process 2320 is performed
through
the conformer 862. In step 2322, supplemental content is identified. In step
2324, a clip
template is selected. As described above, the selected clip template
corresponds with at
least one clip template defined at the playback device, such as recorded on a
portable
storage medium 222. In step 2326, a repeat clip counter is set to zero. As
described
above, in some instances a clip template can be used as a circular back drop
for the
segmenting of the supplemental content when the supplemental content would
produce a
total number of clips that exceed the number of clips within the clip template
and the clip
counter defines the number of times the process has looped through the
playlist.
In step 2330, one or more packets of the supplemental content are associated
with a clip defined in the clip template, e.g., clip template 1124. In step
2332, it is
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determined whether padding packets and/or padding data should be incorporated
into the
clip. In those instances where padding should be incorporated step 2334 is
entered to
determine whether the padding is actually to be incorporated into the clip. As
described
above, the padding can be left out of the clips such that the padding is
actually generated
and incorporated into the clip by the playback device. When padding is to be
actually
incorporated into the clip step 2336 is entered where the amount of padding
and location
of padding is identified and the padding is incorporated into the clip as
determined.
Alternatively, when padding is not to be actually incorporated into the clip
step 2340 is
entered to determine whether a padding designation is to be incorporated into
the content
stream.
When a padding designation is to be incorporated into the content stream,
such as the incorporation of a start code, step 2342 is entered and the
padding designation
is incorporated. In those instances where padding designation is not to be
incorporated
into the content stream, step 2344 is entered where padding is defined within
a mapping,
such as a package mapping file. In some embodiments, padding insertion is
modal and
set prior to processing the content stream and the padding insertion or
designation applies
the same scheme while formatting the content stream in accordance with the
template.
As such, some of the steps of the process 2320 may be removed or skipped. For
example, a step can be included that designates whether padding is to be
incorporated
directly into the stream, defined in a packet mapping or a designation is to
be
incorporated into the stream, and as such the determination steps 2334 and
2340 can be
skipped and the process can proceed directly to the appropriate padding step
when
padding is to be incorporated.
When it is determined in step 2332 that padding data is not to be
incorporated,
or following steps 2336, 2342 and 2344, the process 2320 continues to optional
step 2346
where the clip is give a clip number or identifier, where the clip number or
identifier is
associated in part with the current value of the repeat clip count. In step
2350, it is
determined whether additional supplemental content is to be incorporated into
further
clips in accordance with the clip template. In those instances where no
further
supplemental content is to be clipped the process 2320 terminates.
Alternatively, step
2352 is entered to determine whether further clips are defined within the clip
template.
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When further clips are defined the process returns to step 2330 to associate
another
segment of supplemental content with a subsequent clip defined in the clip
template.
When no further clips are defined in the template it is determined in step
2354 whether a
looping or repeat is authorized. Step 2356 is entered in those instances where
a looping
or repeat is not authorized and an error is generated and the process
terminates or
requests alternative action, such as selecting a different clip template,
authorizing
repeating or other such action. When repeating is authorized, step 2360 is
entered where
the repeat clip counter is incremented and the process returns to step 2330.
FIG. 24 depicts a simplified flow diagram of a process 2420 implemented by a
playback device 220 in playing back content. In step 2422, supplemental
content to be
played back is received, for example, supplemental content corresponding to a
content
place holder 128. In step 2424, a clip repeat counter is set to zero. In step
2426, a clip of
supplemental content is accessed in accordance with clip information files. In
step 2430
it is determined whether a packet or padding mapping is provided. Step 2432 is
entered
when a packet mapping is provided where the playback device determines whether
padding is to be incorporated into a currently accessed clip of supplemental
content.
When padding is to be incorporated in accordance with the mapping step 2434 is
entered
where the padding is added in accordance with the packet mapping.
When it is determined in step 2430 that no padding map is provided and when
it is determined in step 2432 that padding is not to be incorporated into a
current clip, the
process 2420 continues to step 2436 to determine whether a padding designation
is
specified within the supplemental content stream. When a padding designation
is defined
within the supplemental content stream step 2440 is entered where padding is
added in
accordance with the padding designation. In step 2442 the clip of supplemental
content
information is written to local memory.
In step 2444, it is determined whether additional supplemental content is
received for playback in accordance with the clip information 130. In those
instances
where no further supplemental content is received the process 2420 continues
to step
2446 to determine whether playback is terminated, return to playlist or
implement other
relevant actions. Alternatively, step 2448 is entered to determine whether
further clips
are defined within the clip information 130 for the current playlist. When no
further clips
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are defined in the clip information, step 2450 is entered to determine whether
a looping or
repeat is authorized. Step 2452 is entered in those instances where a looping
or repeat is
not authorized and an error is generated and the process terminates or
requests alternative
action. When looping or repeating is authorized, step 2454 is entered where
the repeat
clip counter is incremented and the process returns to step 2426.
As described above, some embodiments provide for the playback of live
content in cooperation with a portable storage medium 222. This can include
supplemental content of captured live events, performance, production or the
like, and
this supplemental content of the live event can be distributed to one or more
playback
devices 220 to provide substantially a live playback of the event, with a
relatively small
delay. Further, because the supplemental content can be distributed to
multiple playback
devices, some embodiments further provide for a synchronized playback on
multiple
playback devices each receiving the supplemental content and further accessing
copies of
the same content recorded on mediums at each playback device (e.g., a portable
storage
medium).
In capturing and/or recording content, some embodiments capture the
supplemental content in segments or clips. For example, when digitally
capturing an
event, such as live performance or a director's presentation, and recording
multimedia
content of the event the supplemental content can be captured in relatively
short segments
compared with the length of playback of the event.
FIG. 25 depicts a simplified block flow diagram of a process 2520 of
capturing and distributing the content over time as the content is captured,
for example,
during a live performance or event to be played back in cooperation with a
medium, such
as a portable storage medium 222, at a playback device 220. A capture device
2522
captures and records digital multimedia content of an event, such as a
performance. The
capture device 2522 can be a camera, a video camera, an audio recorder, other
such
devices and/or combinations of such devices. While capturing the content,
segments
2524 of content are extracted and forwarded to a processing unit 2526. Each
segment
2524 has a duration 2528 or length. The duration 2528 can be the same for each
segment
2524 or may be the same for a series of segments, or may vary between
segments.
Generally, durations 2528 of clips 2524 are configured to match defined and
existing
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placeholders. Further, the durations for the place holders would be based on
anticipated
network download speeds which imply a start up latency.
In some embodiments, the content is captured and clipping or chunking is
performed prior to recording to a network source and/or is performed as part
of a down
processing element which clips the content according to a clipping strategy.
In some
embodiments, however, the content can be segmented to clips at the time of
capture
and/or by the capturing device 2522. In some instances, performing the
clipping at a later
time after capture, for example as part of a download process, can free up the
encoder
from trying to create clean breaks between clips which may be inefficient. In
some
instances, however, a capture device 2522 may create clips that represent
contiguous
pieces of content on a timeline. Durations of clips are configured to match
the existing
placeholders. Choices of durations for the place holders could be based on
anticipated
network download speeds, which imply a start up latency.
Because the capture device 2522 waits to capture the complete segment 2524
prior to forwarding the segment to the processing unit 2526 there is a delay
2530 between
an initial time 2532 of starting a capture of a segment 2524 and a time 2534
that the
segment is received at the processing unit 2526. This delay 2530 typically
includes the
duration of the segment 2528 as well as time for the capture device 2522 to
capture the
segment, perform any relevant formatting and the time to forward the segment
to the
processing unit 2526.
The processing unit 2526 receives each segment 2524 and processes the
segments to produce processed segments 2540 to be forwarded to a playback
device 220.
In some embodiments, the processing unit 2526 may be part of the capture
device 2522,
while in other embodiments some or all of the processing unit 2526 is separate
from the
capture device. The processing unit 2526 may perform substantially any
relevant
processing in preparing the segment to be forwarded to and played back through
a
playback device, which can be substantially any relevant playback device, such
as
playback device 220. For example, the processing performed by the processing
unit 2526
can include, encoding, multiplexing (e.g., audio, menu data and content,
control
functions, programming, and other such content that can be multiplexed with
one or more
of the segments 2524), encrypting, adding special effects, adding supplemental
content
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and/or metadata, or other such processing or combinations of processing.
Further, the
processing unit 2526 can employ a clip template 1324 in generating the
processed
segments 2540 that comply with clip information utilized by the playback
device (e.g., as
defined on a portable storage medium 222). Upon completing the processing the
processed segments 2540 are ready to be forwarded to one or more playback
devices 220.
In some instances, the processed segments 2540 are immediately forwarded to
one or more playback devices 220, for example, when providing playback of a
live
performance, production, performance or the like. Due to the processing at the
processing unit 2526 and the transfer to the playback device there is an
additional delay
2552 in providing the processed segments 2540 to the playback device 220. As a
result
there is a total delay 2554 between the time of capture (e.g., initial time of
capture 2532)
and a time 2556 the processed segment 2540 is received at the playback device
220 to be
played back.
By capturing segments 2524 of the performance or event and processing the
segments 2524 while the event continues to occur, the total delay in playing
back the
performance or event at the playback device 220 can be significantly reduced
and in
many instances provides substantially a live playback with minimal delays of
seconds. In
some instances, the majority of the total delay 2554 is dependent on the
duration or
length of the captured segment 2524. For example, when an event is a one and a
half
hour event, with segments having durations of about 5-20 seconds, or minutes,
the
resulting delay 2554 is fractions of a percent of the total duration of the
event.
Further in some instances, the durations 2528 of the segments 2524 can be
dependent on a clip template. For example, each segment 2524 can have a
duration that
corresponds with anticipated clip durations based on a clip template. In other
instances,
however, the segments 2124 can be further broken down by the processing unit
2526 to
comply with a selected clip template. The processing unit 2526 can include
buffering to
buffer one or more segments 2524. This buffering can be used, for example,
when the
one or more segments 2524 have durations 2528 shorter than a processing delay
2552.
Additionally or alternatively, some embodiments include multiple processing
units 2526 and/or multiprocessing can be performed so that segments 2524 can
have
durations shorter than the processing delay 2552 while limiting or avoiding a
backlog of
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captured segments 2524 awaiting processing. It is further noted, the
processing delay
2552 may vary from segment to segment. As a result, buffering can be employed
allowing for variations in the processing delay 2552 and/or the segment
durations 2528
may similarly be varied at the capture device 2522.
In determining durations of segments, in some embodiments, the application
controlling the capture device has access to a segment schedule. It is noted
that the
duration of the segment can vary and the selection of duration can depend on
many
factors, and further is typically a balance between quality and
implementation. It is
noted, for example, that longer duration segments may be some what more
efficient than
relatively short durations from a network point of view. Additionally, longer
duration
segments would provide better video quality for a similar bit rate because
there would be
more opportunity to take advantage of inter-frame compression across GOP(GOVU)
boundaries.
Shorter durations, however, may also have the advantage of reducing latencies
and reducing a potential drop out time if there is a problem in transmission
or conversion
for a give segment or clip. If a relatively long duration segment gets lost or
fail then a
large drop out occurs that would likely be noticeable. Should a drop-out occur
with
shorter duration segments, it may be notices but likely would not be
catastrophic. Shorter
durations would additional take into consideration the increased numbers of
boundary
conditions between the increased numbers of segments. Further, when the
duration is
being managed at the encoder end, the encoder is typically not aware of the
format
compliance issues. As such, the encoder may perform clean-break encoding
between
segments, which may include closing out the stream following the encoding of
the
segment. Further, the closing out of the stream may interfere or prevent
taking advantage
of inter-frame compression across a clip boundary, extra padding may have to
be
included, and/or processing may have to include evaluating the content so that
the clip
ended with a complete audio unit.
As described above, the capture device 2522 of FIG. 25 can be substantially
any device capable of capturing content to be forwarded to a playback device.
Similarly,
the content captured can be substantially any content, such as images, video,
audio,
graphics, text, and other such content and/or combinations of content. In some
instances,
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the content can include multiple types of content, such as video and audio
content. Still
further, the processing unit 2526 can receive multiple inputs of segment data,
and can
cooperate and/or multiplex these multiple inputs of data into the processed
segments
2540. For example, the processing unit 2526 may receive video segments from a
video
camera, while receiving audio segments from an audio recording device. The
processing
unit can then multiplex the video segments with the audio segments with
corresponding
timing information and/or other such information to accurately coordinate the
playback
of the audio with the video.
In cooperating content from multiple sources the processing unit 2526 will
monitor the timing and synchronize the multiple sources, for example, maintain
the
synchronization between the audio content and the video content. A loss of
synchronization, for example due to master clocks providing timing to each
source device
being different, could result in drift. In some instances, this can be
addressed by utilizing
sources that utilize the same master clock or apply some adaptive conversion.
Further,
the processing unit in multiplexing the content has to honor start up offsets.
Still further,
compensation may have to be provided in the event of drop outs or dropped
samples from
one source or the other.
FIG. 26 depicts a simplified flow diagram of a process 2620 according to
some embodiments that is implemented by the processing unit 2526 in processing
segments 2524 of content from one or more sources (e.g., capture device 2522).
In step
2622, a segment of content is received at the processing unit 2526. For
example, a
segment of video data can be received. In step 2624, it is determined whether
one or
more other segments of other content are to be cooperated and/or synchronized
with the
received segment. This can include multiplexing content or other such
cooperation of
content. Further, the other content can include segments of content previously
received
and/or segments of content simultaneously received, and often are received
from a
separate source. For example, separate audio segments may be received from an
audio
capturing device while video segments are received from a video capturing
device. In
those instances where the received segment is not to be cooperated the process
2620 skips
to step 2636.
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Alternatively, in those instances where the received segment is to be
cooperated with one or more other segments of content step 2626 is entered to
identify
that one or more additional segments of content to be cooperated. In step
2630,
parameters, such as timing, frame number and/or other such information are
extracted
from the received segment and/or the one or more other segments. In step 2632,
an
appropriate cooperation of the received segment and the one or more other
segments is
determined, for example based in part on the extracted timing. In step 2634,
the received
segment and the one or more other segments are cooperated.
In step 2636, it is determined whether further data, such as but not limited
to
menus, graphics, special effects, programming, text, sub-titles, data and the
like are to be
cooperated with the received segment. When further data or other content is to
be
cooperated the process 2620 continues to step 2640 to identify the further
data to be
cooperated. In step 2642 it is determined how the further data is to be
cooperated. In
step 2644 the received segment and further data are cooperated.
Step 2646 is entered following step 2644 and when it is determined in step
2636 that further data is not to be cooperated, where the process 2620
initiates encoding
of the received segment, as well as any other content and/or further data
cooperated with
the received content. The encoding typically utilizes a clip template so that
the encoded
content conforms to an expected clip information on a portable storage medium.
As
described above, the content can be encoded multiple times applying different
clip
templates and/or applying different encoding rates depending on requesting
playback
devices and/or playback devices expected to request the content. Furthermore,
the
encoding can incorporate padding packets and/or data into the content stream
as
described above, and/or the encoding can identify where padding is later to be
incorporated by the playback device and create a padding packet mapping and/or
add
padding identifiers designating where padding packets and/or data is to be
incorporated
into the stream and how much padding is to be added. In step 2650 it is
determined
whether the encoded content is to be protected (e.g., encrypted) or otherwise
processed.
In those instances where further processing and/or protection are to occur
step 2652 is
entered to implement the processing. In step 2654, the encoded segment is
formatted for
communication, such as packaging, incorporating header information, packet
addressing
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and the like producing the processed segment 2540. In step 2656 the processed
segment
2540 is then communicated to the playback device 220 and/or stored for later
communication.
The timeline representation shown in FIG. 25 and the process 2620 of FIG. 26
can be applied in many situations, including live presentations, performances
and other
such live events. Similarly, segmenting the content at the capture device 2522
can be
employed without an intention of immediately forwarding the processed segments
2540
and clip information. Instead, the processed segment 2540 can be stored to be
forwarded
to a requesting playback device at a later time. Alternatively, the content
can be capture,
and then segmented.
FIG. 27 is a simplified block diagram of a data flow process for processing
supplemental content 2720 and 2722 according to some embodiments in generating
clips
of content and clip information corresponding to the generated clips of
supplemental
content. The content 2720 and 2722 can include, for example, video content
2720 and
audio content 2722. Typically, the video content 2720 is provided in a video
file. In
some instances, however, the video content may be one or more files of
recorded video
content. Similarly, the audio content 2722 can include one or more files of
recorded
audio content. The video content 2720 and audio content 2722 are multiplexed
together
to create multiplexed AN content 2724. In some instances, the video content
2720 and
audio content 2722 are encode prior to multiplexing, while in other instances
the video
and audio content are encoded after multiplexing. The multiplexed A/V content
2724 is
then evaluated and clip information 2726 is generated corresponding to the
multiplexed
AN content 2724. In some instances, the content is configured such that the
packets
containing the start of a GOP (GOVU) have their first payload data byte
starting with the
GOP (GOVU) start code sequence. This can reduce the parsing load on the
incoming
stream. Entry point data can be relied upon to identify appropriate segment
boundaries
and packet replacement in the conformer is simplified.
The multiplexed AN content 2724 is further processed and segmented into
processed segments of A/V content 2730. Additionally, the clip information
2726 is
segmented and/or clip information corresponding to the appropriate segment is
generated
to provide segmented clip information 2732. The clip information segmentation
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decisions are made before the AN content is segmented. This is done, in some
embodiments, on the basis of a segment schedule and the entry point data, and
additionally on format specific requirements, such as BD-ROM requirements of
meeting
the aligned unit padding rules. For example, when a progressive playlist is
defined with
connection condition 6 (implying that the sequence of clips are intended to be
treated as a
contiguous stream) a clip may be defined to include an integer number of 6144
byte
aligned units which corresponds to 32 192 byte source packets, each containing
188 byte
transport packets. The arrival time stamp is embedded in the first 4 bytes of
the 232 byte
packet. As another example, connection condition 5 can also be used but just
implies
clean break encoding is employed, which may be slightly less efficient.
When introducing aligned unit padding, the time stamp increments from
packet to packet at no higher rate than the signaled transport stream mux
rate. So when
selecting clip boundaries, sufficient room, from an arrival time stamp point
of view, has
to be provided to insert the padding packets to finish out a previous clip to
an aligned unit
without overlapping the start of the next clip. If there is not enough room,
processing
shifts to the next entry point and again determines whether there is enough
room to insert
padding.
The processed segments of AN content 2730 and the segmented clip
information 2732 can be stored (e.g., at a server or remote storage 328, in
external
memory 229 or internal memory 228 of a playback device 220 when the content is
user
generated content, or other such storage) for later distribution to a playback
device 220 or
distributed to one or more playback devices 220.
In some embodiments, the process is implemented multiple times with
varying parameters and/or based on different clip templates to create
different sets of
segments 2730 and corresponding clip information 2732. For example, a first
set of
segments of content and corresponding clip information can be generated to be
used with
a playback device with a fast communication link, and in some instances having
fast and
complex processing capabilities. A second set of segments of content and clip
information can be generated based on a playback device having a medium speed
communication link. A third set of segments of content and clip information
can be
generated based on a playback device having a relatively slow communication
link.
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FIG. 28 depicts a simplified block diagram representation of a data flow in
segmenting content 2820 and 2822 according to some embodiments. In some
instances,
the video content 2820 is encoded in a single file, and similarly the audio
content 2822 is
encoded in a single file. In the data flow of FIG. 28, the video content 2820
is initially
broken down into a plurality of segments of video content 2824 having playback
durations that are fractions of the durations of a playback duration of the
video content
2820. The size or duration of the video segments 2824 can be dictated by a
clip template
or based on playback and/or communication link parameters.
Further, the size and/or playback durations can vary between segments. For
example, initial segments can be smaller in size and/or have shorter playback
durations,
such as those described above with reference to FIGS. 20 and 21. Similarly,
audio
content 2822 is broken down into a plurality of audio segments 2826.
Typically, the
audio segments 2826 correspond with the video segments 2824. The size and/or
playback
duration of the audio segments 2826 can depend on the size and/or playback
duration of a
corresponding video segment 2824 (it is noted, however, that the video content
may
alternatively be segmented based on the size and/or playback duration of audio
segments
2826).
The video segments 2824 and audio segments 2826 are then multiplexed
through a multiplexer 2830 to create segments of multiplexed A/V content 2832.
The
segments of multiplexed A/V content 2832 are further evaluated to generate
segmented
clip information 2836 that correspond to each segment of multiplexed AN
content 2832.
Prior to being forwarded to a playback device, the segments of AN content 2832
are
typically packaged with their corresponding segmented clip information 2836,
formatted
and/or wrapped for transmission to a playback device. In some embodiments,
clip
information files may be advantageously packaged together, as they are
typically only a
few hundred bytes long. A zip format, simple concatenation or the like could
be used.
A single file could then be broken apart on the player. Further, a single file
may improve
the efficiency of the network transfer.
FIG. 29 depicts a simplified block diagram of a data flow for generating
segments of content to be forwarded to a playback device. In this flow the
content is
segmented as it is captured. This data flow can be employed in some
embodiments with
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the processes described above with reference to FIGS. 25 and 26. A sequence of
video
segments 2922 of an event, presentation, performance or the like are generated
and
outputted by a video capturing device (e.g., device 2522) as the video
capturing device
captures the content. Similarly, a sequence of audio segments 2924 can
additionally or
alternatively be generated as an audio capturing device captures the audio
content.
Typically, the captured content is encoded such that each segment of video
content 2922
and each segment of audio content 2924 are encoded segments. Each video
segment
2922 is multiplexed by a multiplexor 2926 with its corresponding audio segment
2924 to
produce segments of AN content 2930. Each segment of A/V content 2930 is
further
analyzed and/or evaluated to generate clip information 2932 for each segment
of AN
content 2930. As a result, the segments of AN content 2930 and corresponding
clip
information 2932 are generated as the content is captured. This application,
in some
instances, can be useful at least with the capture of events that a
distributor wants to
distribute prior to the termination or completion of the event being or
captured recorded.
FIG. 30 depicts a simplified flow diagram of a process 3020 of configuring
and recording content to a portable storage medium 222 to be utilized with a
playback
device 220 that conforms to a fixed length content framework to playback
content from
the portable storage medium along with supplemental content accessed from a
secondary
storage medium, where the supplemental content is unknown at the time the
portable
storage medium 222 is configured. In step 3022, content to be recorded to the
portable
storage medium is identified. This can include substantially any content, such
as but not
limited to, multimedia content, textual data and/or other such content. In
step 3024,
menu items and other relevant user interface controls are selected to be
incorporated onto
the medium 222. In optional step 3026, auxiliary data and content 138 (e.g.,
sound data,
graphics and the like) to be incorporated onto the medium 222 are identified.
In step
3030 programming to be included on the medium is selected.
In step 3032, it is identified that supplemental content not to be recorded to
the portable storage medium 222 is to be associated with the portable storage
medium. In
step 3034, a presentation flow for the content, menus and the like to be
recorded to the
medium and supplemental content is determined. This includes defining ordering
of
playback of content files and/or supplemental content, when and/or how menus
are
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activated, reactions to user issued commands, and other such coordination. The
process
3020 then continues to step 3036 where a playlist 122 is generated
incorporating the
playlist files 124 and place holders 128.
In step 3040 it is determined whether further playlist directories and/or clip
information directories are to be generated. As described above, in some
instances a
medium 222 may include multiple playlists based on different characteristics
and/or
playback device capabilities. In those instances where further playlist
directories and/or
clip information directories are to be generated the process returns to step
3022.
Alternatively, the process continues to step 3042 where one or more file
structures are
defined and recorded to the portable storage medium 222. This includes
establishing the
playlist directory 122, clip information listing or directory 126 and stream
directory 132,
and recording the playlist files 124, content place holders 128, clip
information files 130,
content files 134 corresponding to the playlist files 124, menus 136,
programming 142
and the like onto the medium. In some embodiments, it can be implemented at
least in
part by defining a media image.
The present embodiments, provide methods, systems, code, applications,
software and data structures stored on computer readable mediums that allow
variable
length supplemental content not recorded on a portable storage medium to be
played back
through a playback device in cooperation with the portable storage medium
accessed by
the playback device that complies with a fixed length framework. In part some
embodiments provide this variable length playback by defining a playback
duration on
the medium for supplemental content, where the defined duration is greater
than an
expected actual duration of potential supplemental content that, at the time
the medium is
configured may be unknown and/or not even generated. Upon later playback of
the
supplemental content, the playback device detects an actual completion of
playback of
the accessed supplemental content to override the duration designated on the
medium 222
to terminate the playback relative to a selected place holder 128 and return
control to a
user interface or further continue playback relative to the playlist 122. In
some instances,
the portable storage medium 222 may not actually include content to be played
back.
Instead, the medium 222 can simply be a container with a playlist to designate
the
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playback of supplemental content, and with programming 142 to provide for the
cooperation and/or accommodation of variable length content.
Content creators and/or distributors, such as movie studios and the like, can
distribute portable storage mediums with multimedia content recorded on the
mediums,
while allowing playback of dynamic current and up-to-date supplemental content
at the
time of playback relative to the distributed medium. Further, the supplemental
content is
not restricted to content known or even available at the time of generating
and
distributing the mediums. Instead, the supplemental content can be created
after the
mediums are distributed. Furthermore, the supplemental content can be live
content
captured during the playback relative to the medium. Similarly, the ability to
provide
playback with dynamic, variable length content allow mediums, for example
movie disks,
to allow supplemental content, including in some instances user generated
content, to be
cooperated with playback of movie. Similarly, users can interact during
playback with
content recorded on a medium, such as playing back user generated content
(e.g.,
delivered as a picture in picture) in synchronization with feature A/V content
recorded on
the medium. In some instances, a user generated content stream can be recorded
and then
a selection process is implemented to select an appropriate template to be is
used in the
encoding of the user content (e.g., video content). The user content is
further mapped to
be used in cooperation with the storage medium 222
Further, the content owner or distributor can make a movie or part of movie
available over the Internet, for example, a relatively blank disc (i.e.,
relatively little
multimedia content recorded on the disc) can be used as an initiation point to
access and
acquire the content from a studio, through the studio's or other authorized
distributor's
web site. Similarly, the content owner or distributor can make enhancements,
special
features, added content and the like available to users having a particular
portable storage
medium, and/or users who have paid for rights to obtain access to the
enhancements,
special features, added content and the like. This can provide the content
owners and
distributors with additional avenues for revenue and/or marketing.
The portable storage medium can be generated and distributed without
knowing what actual supplemental content is going to be played back in
association with
the medium. Further, the ability to playback non-fixed length content through
a playback
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device that conforms with a fixed length framework allows users to participate
in live
hosted events. For example, a movie studio can host a session, in association
with one or
more specific mediums, to allow users to participate and synchronize their
playback
devices through a network connection, where the network connection supplies
supplemental content and controls and synchronizes playback of content from
the
medium and the supplemental content. As a further example, a director can
provide to
users accessing a particular web site or sites a live a guided tour through a
movie. During
this director's tour, content from mediums at the users' playback devices can
be played
back in response to instructions from the director as well as providing
playback of
supplemental content from the director, such as audio commentary, additional
video
distributed over the Internet during the live presentation and other such
supplemental
content. In some embodiments, the distribution of control commands issued by
the
director can be delayed, or commands can include timing so that the playback
at the
users' devices (including the playback of live content, which will be received
at the
playback device with at least some minor delay, as described in some
embodiments
above) maintain a synchronization with the director.
The supplemental content made available to the user can be substantially any
content and can be generated at any time prior to and/or during playback. The
replicated
portable storage medium can contain information that allows playback devices
to pull
information from a remote source or server and be utilized by the playback
device, for
example while implementing programming recorded on the medium, to control a
user
interface. For example, the programming can cause the playback device to poll
a server
for content and generate a listing, which may be in the form of a user
interface, of content
and/or types of content (textual data, graphical data) designated by the
server that are
available, where control is returned to the user to make a selection.
Alternatively, the
playback device can generate a user interface listing of content and/or types
of content
available and then returns control to user to make a selection. It is noted
that the
communication between the playback device and the remote source can be through
substantially any relevant communication method and/or protocol. For example,
some
embodiments may provide communication to be driven off a metadata format, such
as
XML documents, predefined scheme or rule set of how this communication
happens.
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Further in some embodiments, the portable storage medium 222 can be a
container or shell that complies with fixed length standards, but does not
include any
content or only a minimal amount of content, and instead is used as a key or
access to
other supplemental content retrieved from a separate storage medium (e.g.,
received from
a remote storage device) that is played back through the playback device.
In some instances, the medium 222 provides a place holder that can be utilized
to playback substantially any relevant content. Further, one or more
predefined clip
templates can be defined on the medium 222 or provided to the playback device
322 prior
to activating playback. As a result, substantially any content can be
cooperated with that
medium as long as the content is formatted in accordance with one of define
clip
templates and the corresponding clip information. There is so much content in
the world,
it would be impossible to download all the possible clip informations such
that it would
be local and referenced by a playback device. Some present embodiments,
however,
defines general containers or clip templates into which content can be defined
such that
the content can be downloaded in accordance with the defined containers, and
specific
content information generally does not have to be downloaded.
Further, because the playback device has access to the container or the one or
more defined clip templates and/or clip information, users can gain access to
supplemental content that is not even available at the time playback is
initiated. For
example, when playing back content relative to a disc conforming to a fixed
length
framework, and even after a playback device is updated with updated
supplemental
content, a third party may record additional supplemental content (e.g.,
commentary) to
be live transcoded and downloaded. This additional supplemental content can be
received and played back through the playback device without requiring the
playback
device to be shut down or rebooted, and instead the additional supplemental
content can
be accessed and played back when the additional supplemental content is
formatted in
accordance with a clip template and/or clip information available to the
playback device.
Additionally, the present embodiments reduce the local storage requirements
for playback devices 322 and/or storage mediums 222. If there were a thousand
different
clips, a user would have to download each of the clip information for a
thousand clips.
Instead, some embodiments provide for the generic clip information or template
so that
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substantially any content can be made to conform with the one or more clip
informations
or predefined templates. Further, the templates or frameworks are defined not
only fixed
time when recorded to the medium, but can be made available at an update.
The present embodiments provide methods, systems, processes, applications,
portable storage mediums to allow playback of supplemental content. Further,
at least
some of these embodiments allow the playback of supplemental content in
cooperation
with content recorded on a portable storage medium, and in some instances
where the
content on the portable storage medium is read only and substantially fixed.
Some of
these embodiments provide methods for use in providing supplemental content to
be
played back with a portable storage medium through a playback device that
conforms to a
fixed length content framework. Additionally or alternatively, some
embodiments
provide methods for use in generating clips of supplemental content to be
played back,
through a playback device that conforms to a fixed length content framework,
in
accordance with a portable storage medium directly accessed by the playback
device.
Further, some embodiments provide methods of providing playback of content in
association with a portable storage medium.
In some embodiments, methods provide supplemental content to be played
back with a portable storage medium through a playback device that conforms to
a fixed
length content framework. These methods receive a request for supplemental
content
from a playback device, identify the supplemental content, determine
parameters
regarding at least one or more capabilities of the playback device, select one
series of
clips of supplemental content from a plurality of series of clips of
supplemental content
generated prior to receiving the request, where the selected one of the series
of clips of
supplemental content correspond with the one or more of the determined
parameters
relative to the capabilities of the playback device, and forward supplemental
content clips
to the requesting playback device. In some instances, determining the
parameters
comprises receiving an identification of a clip template dictating clip
information
recorded on the portable storage medium, and selecting the one series of clips
of
supplemental content comprises selecting the one series of clips of
supplemental content
such that the selected on series correspond to the identified clip template.
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Additionally or alternatively, some embodiment provide methods of
generating a clip template adapted to be used in segmenting supplemental
content not
recorded on a portable storage medium and to be played back through a playback
device
in cooperation with a portable storage medium directly accessed by the
playback device.
At least some of these methods identify playback device parameters; determine
a fixed
clip data size relative to the identified playback device parameters;
determine, based at
least in part on the identified playback device parameters, a number of clips
to have data
sizes that progressively increase in data size with each successive,
sequential clip relative
to a playback sequence, such that each successive, sequential clip has a data
size greater
than a data size of an immediately subsequent clip; and define a series of a
plurality of
clips such that a first plurality of sequential clips, relative to the
playback sequence, have
successively increasing data sizes and a second plurality of sequential clips
following the
first plurality of clips, relative to the playback sequence, have data sizes
at most equal to
the fixed clip data size. In some instances, a data size of a first clip of
the first plurality
of clips relative to the playback sequence has a data size that is less than
the data sizes of
the remaining clips of the first plurality of clips and is less than the fixed
data size.
Further, the methods can additionally determine that a trigger event is to be
defined
relative to a second clip; identify a third plurality of sequential clips
including the second
clip; and define data sizes of each clip of the third plurality of clips to be
progressively
larger, where a data size of the second clip is less than a data size of an
immediately
subsequent clip relative to the playback sequence. In some instances, the
trigger event is
a trigger to change chapters relative to content configured in accordance with
the defined
clip template. Additionally, the identifying the parameters can comprises
identifying a
data rate; and identifying an anticipated buffer size of a playback device,
such that the
fixed data size and a data size of the first clip of the first plurality of
sequential clips are
dependent on the data rate and the anticipated buffer size.
Some embodiments additionally or alternatively provide one or more data
structures recorded on a computer readable medium that dictates formatting of
multimedia content as the multimedia content is formatted. The one or more
data
structures can include a plurality of clips; a designated event trigger
associated with a
first clip of the plurality of clips; the first clip associated with the event
trigger having a
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data size that is less than an immediately preceding clip, relative to a
playback sequence;
and a first plurality of sequential clips immediately subsequent to the first
clip, relative to
a playback sequence, having data sizes that are progressively larger. In some
instances,
can include a second plurality of sequential clips immediately subsequent to
the first
plurality of sequential clips, relative to a playback sequence, having data
sizes that are
substantially constant. Further, the data size of the second plurality of
clips can be equal
to a data size of a second clip of the first plurality of clips, where the
second clip
immediately precedes, relative to a playback sequence, the second plurality of
clips.
Additionally, some embodiments provide methods of playing back content in
cooperation through a playback device that complies with a fixed length
content
framework. These methods can detect access to medium; access a playlist
recorded on a
portable storage medium; initiate playback of content relative to the portable
storage
medium; detect a place holder specified in the playlist; identify access to a
source other
than the portable storage medium for supplemental content associated with the
detected
place holder; access the source; receive supplemental content after the
initiating of the
playback, where the supplemental content has a playback duration that is less
than
playback duration designated in the playlist and associated with the
identified place
holder; initiate playback of the supplemental content; detect that the
playback of the
supplemental content has completed; override the playback duration designated
in the
playlist and associated with the place holder; and return control of playback
relative to
the playlist. In some instances, accessing the playlist comprises: identifying
playback
parameters of at least playback device directly accessing the portable storage
medium;
detecting that there are multiple playlists are defined on the portable
storage medium; and
selecting the playlist of the plurality of playlists based on the identified
playback
parameters. Further, some embodiments request details of the supplemental
content from
the source; and receive metadata exclusively associated with the supplemental
content
that in part defines an actual playback duration of the supplemental content
that is less
than the playback duration designated in the playlist and associated with the
identified
place holder. Additionally, some embodiments receive metadata exclusively
associated
with the supplemental content; and detect a command within the metadata to
stop
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playback relative to the supplemental content designating the completion of
the playback
of the supplemental content.
Methods of providing playback of content in association with a portable
storage medium are provided in accordance with some embodiments. These method
comprises: accessing, by a playback device configured to comply to a fixed
length
content framework, a first playlist of a file structure stored on a portable
storage medium
directly accessed by the playback device; initiating playback of content
relative to the
portable storage medium; detecting a place holder defined within the first
playlist relative
to accessing supplemental content that is not stored on the portable storage
medium that
has a first playback duration; retrieving clip information recorded on the
portable storage
medium for the place holder and extracting a second playback duration
designated in the
clip information for the place holder where the second playback duration is
greater than
the first playback duration; retrieving at least a portion of the supplemental
content after
the initiating playback of the content relative to the portable storage
medium; initiating
playback of at least the portion of supplemental content; detecting the
completion of
playback of the supplemental content; terminating the playback of the
supplemental
content; and returning playback control relative to the first playlist. These
methods can,
in some instances, additionally retrieve metadata exclusively associated with
the
supplemental content, where the metadata defines the first playback duration
of the
supplemental content; the detecting the completion of the playback of the
supplemental
content can comprises detecting, during playback of the supplemental content,
that the
first playback duration has been reached; and overriding the second playback
duration in
response to detecting that the first playback duration has been reached.
Further, some
embodiments accessing the portable storage medium, identifying that a
plurality of
playlists are defined on the portable storage medium; identify at least
playback device
parameters; and select the first playlist of the plurality of playlists where
the first playlist
corresponds with the identified playback device parameters, and implementing
the
accessing to the playlist in response to selecting the playlist. In some
instances, the
initiating playback of at least the portion of supplemental content comprises
initiating
playback of at least the portion of the supplemental content as the
supplemental content is
received.
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Furthermore, some embodiments provide methods of distributing portable
storage mediums that are configured to conform to fixed length content
framework.
These methods can comprise: generating a playlist; recording the playlist to a
portable
storage medium; and recording content to the portable storage medium
associated with
the playlist; wherein the generating the playlist comprises: incorporating one
or more
content designator into the playlist; identifying content files such that each
content
designator corresponds with one of the content files; incorporating one or
more place
holders indicating supplemental content not recorded on the portable storage
medium and
accessed from a secondary source at a time of playback, such that the
supplemental
content is to be played back in relation to the portable storage medium; and
incorporating
clip information for each content file and the one or more place holders,
where the clip
information for the one or more place holders designates a playback duration
that is
greater than the expected supplemental content to be played back in
cooperation with the
portable storage medium.
Still further embodiments provide methods of supplying supplemental content
to be played back through a playback device relative to a portable storage
medium
directly accessed by the playback device. These methods can receive, from over
a
distributed communication network, a request for supplemental content;
identify the
supplemental content; determine whether the supplemental content is to be
streamed over
the distributed communication network to the playback device; identify, in
response to
determining that the supplemental content is not to be streamed, a predefined
clip
template defined prior to receiving the request; break the supplemental
content into clips
of supplemental content in accordance with the identified predefined clip
template; and
transfer over the distributed communication network the clips of supplemental
content
that conform to the selected clip template. In some instances, the breaking
the
supplemental content into clips comprises incorporating null data into one or
more of the
clips of supplemental content such that the supplemental content within the
clips
complies with placement within the respective clips. Additionally, these
methods can
issue a media stop command to the playback device such that the playback
device
terminates playback relative to the supplemental content and returns control
to the
playback device relative to a playlist recorded on a portable storage medium
directly
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CA 02798533 2012-12-06
accessed by the playback device, where the playlist instructed the playback
device to
obtain the supplemental content. Further, the playlist, recorded on the
portable storage
medium prior to receiving the request, can additionally comprise clip
information
designating a playback duration relative to the supplemental content, and the
issuing the
media stop command comprises issuing the media stop command prior to playback
at the
playback device reaching the playback duration specified in the clip
information relative
to the supplemental content.
While the invention herein disclosed has been described by means of specific
embodiments and applications thereof, numerous modifications and variations
could be
made thereto by those skilled in the art without departing from the scope of
the invention
set forth in the claims.
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