US20100169303A1 - Playlists for real-time or near real-time streaming - Google Patents
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Definitions
- Embodiments of the invention relate to data transmission techniques. More particularly, embodiments of the invention relate to techniques that allow streaming of data using non-streaming protocols such as, for example, Hypertext Transfer Protocol (HTTP).
- HTTP Hypertext Transfer Protocol
- Streaming of content generally refers to multimedia content that is constantly transmitted from a server device and received by a client device.
- the content is usually presented to an end-user while it is being delivered by the streaming server.
- the name refers to the delivery method of the medium rather than to the medium itself.
- a server device stores at least a portion of content to be streamed.
- the content is typically a time based stream of images or audio (e.g. sounds or music) or both; an example of a time based stream is a movie in which the order and presentation of images is based on time, and hence it can be considered a time based stream.
- the server includes a segmenter agent to decompose the content to be streamed into segments to be transmitted via packets according to a network protocol and an indexer agent to generate one or more playlist files that can facilitate a client in presenting the segmented user data.
- a client device is coupled with the server device (or another server which stores the segments and playlists and transmits them but does not generate them) via a network.
- the client device has an assembler agent to receive the one or more playlist files and facilitate retrieval of the segmented media files into the content according to the one or more playlist files.
- the client device can also have an output generator agent to output the content via one or more output components of the client device.
- the server device acquires data to be transmitted to the client device.
- the server device divides the data to be transmitted into multiple media files with a segmenter agent.
- the server device also stores the multiple segments as individual media files in a memory.
- the server device further generates one or more playlist files having references to the multiple media files.
- the server device (or another server device) transmits the one or more playlist files and at least a subset of the multiple media files over a network to the client device.
- the multiple media files can be transmitted using a non-streaming transfer protocol in response to requests from the client device; this protocol may be, for example, HTTP.
- the client device can receive and store the one or more playlist files.
- the client then can request the segmented media files identified in the playlist file(s) and download the linked media files.
- the client device (or another client device) can then generate an audio and/or video output representing the stream of content.
- an updated playlist can be dynamically generated by a server and then retrieved by a client.
- the updated playlist can include ancillary material (e.g. advertisements in a sidebar user interface, related content, alternative versions, etc.) shown in addition to the program in the original playlist or can include additional portions of the program (e.g. the second half of a program which is beyond the first half identified in the original playlist).
- a server can use a rolling method, described herein, to update the playlist which is then retrieved by the client as an updated playlist.
- a playlist can specify a plurality of alternative streams representing the same content; these alternative streams may be the same program transmitted at different visual resolutions (and hence transmitted at different bit rates) or with other different attributes.
- a server can generate multiple playlists, each for one of the alternative streams and can generate a variant playlist which refers to or otherwise specifies the alternative streams.
- the server (or another server) can then transmit the variant playlist to a client device, and the client device can decide, based on current network conditions (e.g. the current throughput rate on a network used to transfer the media files), which playlist to select from the variant playlist, and the client device can download the selected playlist (and further download the media files specified by that selected playlist).
- a client device can switch from a first playlist in the variant playlist to a second playlist in that variant playlist while receiving and presenting content.
- a client device can be receiving a program, using the first playlist and a first bit rate and can determine through measurements of the throughput rate of the network that it can receive content of the same program at a higher, second bit rate, that content being specified by the second playlist.
- the client device can request the second playlist receive the second playlist and begin retrieving the media files specified in the second playlist while continuing to present the content specified by the first playlist.
- the client device can store the media files and the resulting decompressed content in buffers for both playlists, and the client device can perform an automatic operation to determine when and how to switch or transition between the two versions of the content.
- a client device can use pattern matching of the audio content in the two versions of the content to find a matching point in the two versions and then cause a switch after identifying a transition in the new content from the second playlist.
- FIG. 1 is a block diagram of one embodiment of a server and clients that can send and receive real-time, or near real-time, content.
- FIG. 2A is a flow diagram of one embodiment of a technique for one or more server devices to support media content using non-streaming protocols.
- FIG. 2B is a flow diagram of one embodiment of a technique for one or more server devices to provide dynamically updated playlists to one or more client devices.
- FIG. 2C is a flow diagram of one embodiment of a technique for one or more server devices to provide media content to client devices using multiple bit rates.
- FIG. 3A is a flow diagram of one embodiment of a technique for a client device to support streaming of content using non-streaming protocols.
- FIG. 3B is a flow diagram of one embodiment of a technique for a client device to support streaming of content using multiple bit rates.
- FIG. 4 is a block diagram of one embodiment of a server stream agent.
- FIG. 5 is a block diagram of one embodiment of a client stream agent.
- FIG. 6 illustrates on embodiment, of a playlist file with multiple tags.
- FIG. 7 is a flow diagram of one embodiment of a playback technique for assembled streams as described herein.
- FIG. 8 is a block diagram of one embodiment of an electronic system.
- FIG. 9A is a flowchart showing an example of how a client device can switch between alternative content in a variant playlist.
- FIG. 9B is a further flowchart showing how a client device can switch between content in two playlists.
- FIG. 9C is a further flowchart showing an example of how a client device can switch between content using audio pattern matching.
- FIG. 9D shows diagrammatically how the method of FIG. 9C is implemented with audio pattern matching.
- the present description includes material protected by copyrights, such as illustrations of graphical user interface images.
- the copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office file or records, but otherwise reserves all copyrights whatsoever. Copyright Apple Inc. 2009.
- techniques and components described herein can include mechanisms to deliver streaming experience using non-streaming protocols (e.g., HTTP) and other technologies (e.g., Motion Picture Expert Group (MPEG) streams).
- HTTP non-streaming protocols
- MPEG Motion Picture Expert Group
- near real-time streaming experience can be provided using HTTP to broadcast a “live” musical or sporting event, live news, a Web camera feed, etc.
- a protocol can segment incoming media data into multiple media files and store those segmented media files on a server.
- the protocol can also build a playlist file that includes Uniform Resource Identifiers (URIs) that direct the client to the segmented media files stored on a server.
- URIs Uniform Resource Identifiers
- the client can provide the user with a near real-time broadcast of a “live” event.
- Pre-recorded content can be provided in a similar manner.
- the server can dynamically introduce supplementary or alternative media content (e.g., advertisements, statistics related to a sporting event, additional media content to the main presentation) into the broadcast event.
- supplementary or alternative media content e.g., advertisements, statistics related to a sporting event, additional media content to the main presentation
- the server can add additional URIs to the playlist file, the URIs may identify a location from which a client can download a supplementary media file.
- the client can be instructed to periodically retrieve from the server one or more updated playlist file(s) in order to access any supplementary or additional (or both) media content the server has introduced.
- the server can operate in either cumulative mode or in rolling mode.
- cumulative mode the server can create a playlist file and append media file identifiers to the end of the playlist file.
- the client then has access to all parts of the stream from a single playlist file (e.g., a user can start at the middle of a show) when downloaded.
- rolling mode the server may limit the availability of media files by removing media file identifiers from the beginning of the playlist file on a rolling basis, thereby providing a sliding window of media content accessible to a client device.
- the server can also add media file identifiers to the playlist and, in rolling mode, the server can limit the availability of media files to those that have been most recently added to the playlist.
- the client then repeatedly downloads updated copies of the playlist file to continue viewing.
- the rolling basis for playlist downloading can be useful when the content is potentially unbounded in time (e.g. content from a continuously operated web cam).
- the client can continue to repeatedly request the playlist in the rolling mode until it finds an end tag in the playlist.
- the mechanism supports bit rate switching by providing variant streams of the same presentation.
- several versions of a presentation to be served can be stored on the server.
- Each version can have substantially the same content but be encoded at different bit rates. This can allow the client device to switch between bit rates depending on, for example, a detection of the available bandwidth, without compromising continuity of playback.
- protection features may be provided to protect content against unauthorized use.
- non-sequential media file numbering may be used to prevent prediction.
- Encryption of media files may be used.
- Partial media file lists may be used. Additional and/or different protection features may also be provided.
- FIG. 1 is a block diagram of one embodiment of a server and clients that can send and receive real-time, or near real-time, content.
- the example of FIG. 1 provides a simple server-client connection with two clients coupled with a server via a network. Any number of clients may be supported utilizing the techniques and mechanisms described herein.
- multiple servers may provide content and/or may operate together to provide content according to the techniques and mechanisms described herein. For example, one server may create the content, create the playlists and create the multiple media (e.g. files) and other servers store and transmit the created content.
- Network 110 may be any type of network whether wired, wireless (e.g., IEEE 802.11, 802.16) or any combination thereof.
- Network 100 may be the Internet or an intranet.
- network 110 may be a cellular network (e.g., 3G, CDMA).
- client devices 150 and 180 may be capable of communicating over multiple network types (e.g. each device can communicate over a WiFi wireless LAN and also over a wireless cellular telephone network).
- client devices 150 and 180 may be smart phones or cellular-enabled personal digital assistants that can communicate over cellular radiotelephone networks as well as data networks. These devices may be able to utilize the streaming mechanisms described herein over either type of network or even switch between networks as necessary.
- Server 120 may operate as a HTTP server in any manner known in the art. That is server 120 includes a HTTP server agent 145 that provides content using HTTP protocols. While the example of FIG. 1 is described in terms of HTTP, other protocols can be utilized in a similar manner. Segmenter 130 and indexer 135 are agents that reside on server 120 (or multiple servers) to provide content in media files with a playlist file as described herein. These media files and playlist files may be provided over network 110 via HTTP server agent 145 (or via other servers) using HTTP protocols. Agents as discussed herein can be implemented as hardware, software, firmware or a combination thereof.
- Segmenter 130 may function to divide the stream of media data into multiple media files that may be transmitted via HTTP protocols.
- Indexer 135 may function to create a playlist file corresponding to the segmented media files so that client devices can reassemble the media files to provide real-time, or near real-time, transmission of the content provided by server 120 .
- HTTP server agent 145 (or other servers) may transmit one or more playlist files as generated by indexer 135 and media files of content as generated by segmenter 130 .
- Server 120 may further include optional security agent 140 that provides one or more of the security functions (e.g. encryption) discussed herein. Server 120 may also include additional components not illustrated in FIG. 1 .
- Client devices 150 and 180 may receive the playlist files and media files from server 120 over network 110 .
- Client devices may be any type of electronic device that is capable of receiving data transmitted over a network and generate output utilizing the data received via the network, for example, wireless mobile devices, PDAs, entertainment devices consumer electronic devices, etc.
- the output may be any media type of combination of media types, including, for example, audio, video or any combination thereof.
- Client device 150 can include assembler agent 160 and output generator agent 165 .
- client device 180 can include assembler agent 190 and output generator agent 195 .
- Assembler agents 160 and 180 receive the playlist files from server 120 and use the playlist files to access and download media files from server 120 .
- Output generator agents 165 and 195 use the downloaded media files to generate output from client devices 150 and 160 , respectively.
- the output may be provided by one or more speakers, one or more display screens, a combination of speakers and display screens or any other input or output device.
- the client devices can also include memory (e.g. flash memory or DRAM, etc.) to act as a buffer to store the media files (e.g.
- the buffer can provide many seconds worth of presentable content beyond the time of content currently being presented so that the buffered content can later be displayed while new content is being downloaded.
- This buffer can provide presentable content while the client device is attempting to retrieve content through an intermittently slow network connection and hence the buffer can hide network latency or connection problems.
- Client devices 150 and 180 may further include optional security agents 170 and 185 , respectively that provide one or more of the security functions discussed herein. Client devices 150 and 180 may also include additional components not illustrated in FIG. 1 .
- the techniques that are described in this application may be used to transmit an unbounded stream of multimedia data over a non-streaming protocol (e.g., HTTP).
- Embodiments can also include encryption of media data and/or provision of alternate versions of a stream (e.g., to provide alternate bit rates). Because media data can be transmitted soon after creation, the data can be received in near real-time.
- Example data formats for files as well as actions to be taken by a server (sender) and a client (receiver) of the stream of multimedia data are provided; however, other formats can also be supported.
- a media presentation that can be transmitted as a simulated real-time stream (or near real-time stream) is specified by a Universal Resource Indicator (URI) that indicates a playlist file.
- URI Universal Resource Indicator
- the playlist file is an ordered list of additional URIs.
- Each URI in the playlist file refers to a media file that is a segment of a stream which may be a single contiguous stream of media data for a particular program.
- the client device obtains the playlist file from the server.
- the client also obtains and plays each media data file indicated by the playlist file.
- the client can dynamically or repeatedly reload the playlist file to discover additional and/or different media segments.
- the playlist files may be, for example, Extended M3U Playlist files.
- additional tags that effectively extend the M3U format are used.
- M3U refers to Moving Picture Experts Group Audio Layer 3 Uniform Resource Locator (MP3 URL) and is a format used to store multimedia playlists.
- MP3 URL Moving Picture Experts Group Audio Layer 3 Uniform Resource Locator
- a M3U file is a text file that contains the locations of one or more media files for a media player to play.
- the playlist file in one embodiment, is an Extended M3U-formatted text file that consists of individual lines.
- the lines can be terminated by either a single LF character or a CR character followed by a LF character.
- Each line can be a URI, a blank line, or start with a comment character (e.g. ‘#’) URIs identify media files to be played. Blank lines can be ignored.
- Lines that start with the comment character can be either comments or tags.
- Tags can begin with #EXT, while comment lines can begin with #. Comment lines are normally ignored by the server and client.
- playlist files are encoded in UTF-8 format.
- UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding format. In alternate embodiments, other character encoding formats can be used.
- an Extended M3U format is utilized that includes two tags: EXTM3U and EXTINF.
- An Extended M3U file may be distinguished from a basic M3U file by a first line that includes “#EXTM3U”.
- EXTINF is a record marker that describes the media file identified by the URI that follows the tag.
- each media file URI is preceded by an EXTINF tag, for example:
- duration specifies the duration of the media file and “title” is the title of the target media file.
- tags may be used to manage the transfer and playback of media files:
- the EXT-X-TARGETDURATION tag can indicate the approximate duration of the next media file that will be added to the presentation. It can be included in the playback file and the format can be:
- Each media file URI in a playlist file can have a unique sequence number.
- the sequence number, if present, of a URI is equal to the sequence number of the URI that preceded it, plus one in one embodiment.
- the EXT-X-MEDIA-SEQUENCE tag can indicate the sequence number of the first URI that appears in a playlist file and the format can be:
- the EXT-X-KEY tag provides information that can be used to decrypt media files that follow it and the format can be:
- An encryption method of NONE indicates no encryption.
- Various encryption methods may be used, for example AES-128, which indicates encryption using the Advance Encryption Standard encryption with a 128-bit key and PKCS7 padding [see RFC 3852].
- a new EXT-X-KEY tag supersedes any prior EXT-X-KEY tags.
- An EXT-X-KEY tag with a URI parameter identifies the key file.
- a key file may contain the cipher key that is to he used to decrypt subsequent media files listed in the playlist file.
- the AES-128 encryption method uses 16-octet keys.
- the format of the key file can be a packed array of 16 octets in binary format.
- AES-128 normally requires that the same 16-octet initialization vector (IV) be supplied when encrypting and decrypting. Varying the IV can be used to increase the strength of the cipher.
- the sequence number of the media file can be used as the IV when encrypting or decrypting media files.
- the EXT-X-PROGRAM-DATE-TIME tag can associate the beginning of the next media file with an absolute date and/or time and can include or indicate a time zone.
- the date/time representation is ISO/IEC 8601:2004.
- the tag format can be:
- the EXT-X-ALLOW-CACHE tag can be used to indicate whether the client may cache the downloaded media files for later playback.
- the tag format can be:
- the ENT-X-ENDLIST tag indicates in one embodiment that no more media files will be added to the playlist file.
- the tag format can be:
- the EXT-X-STREAM-INF tag can be used to indicate that the next URI in the playlist file identifies another playlist file.
- the tag format can be, in one embodiment:
- the foregoing tags and attributes can be used by the server device to organize, transmit and process the media files that represent the original media content.
- the client devices use this information to reassemble and present the media files in a manner to provide a real-time, or near real-time, streaming experience (e.g. viewing of a live broadcast such as a music or sporting event) to a user of the client device.
- a real-time, or near real-time, streaming experience e.g. viewing of a live broadcast such as a music or sporting event
- Each media file URI in a playlist file identifies a media file that is a segment of the original presentation (i.e., original media content).
- each media file is formatted as a MPEG-2 transport stream, a MPEG-2 program stream, or a MPEG-2 audio elementary stream.
- the format can be specified by specifying a CODEC, and the playlist can specify a format by specifying a CODEC.
- all media files in a presentation have the same format; however, multiple formats may be supported in other embodiments.
- a transport stream file should, in one embodiment, contain a single MPEG-2 program, and there should be a Program Association Table and a Program Map Table at the start of each file.
- Clients should, in one embodiment, ignore private streams inside Transport Streams that they do not recognize.
- FIG. 2A is a flow diagram of one embodiment of a technique for one or more server devices to support media content using non-streaming protocols.
- the example of FIG. 2A is provided in terms of HTTP; however, other non-streaming protocols can be utilized in a similar manner.
- the example of FIG. 2A is provided in terms of a single server performing certain tasks. However, any number of servers may be utilized.
- the server that provides media files to client devices may be a different device than a server that segments the content into multiple media files.
- the server device receives content to be provided in operation 200 .
- the content may represent live audio and/or video (e.g., a sporting event, live news, a Web camera feed).
- the content may also represent pre-recorded content (e.g., a concert that has been recorded, a training seminar, etc.).
- the content may be received by the server according to any format and protocol known in the art, whether streamed or not.
- the content is received by the server in the form of a MPEG-2 stream; however, other formats can also be supported.
- the server may then store temporarily at least portions of the content in operation 210 .
- the content or at least portions of the content may be stored temporarily, for example, on a storage device (e.g., hard disk in a Storage Area Network, etc.) or in memory.
- the content may be received as via a storage medium (e.g., compact disc, flash drive) from which the content may be transferred to a storage device or memory.
- the server has an encoder that converts, if necessary, the content to one or more streams (e.g., MPEG-2 ). This conversion can occur without storing permanently the received content, and in some embodiments, the storage operation 210 may be omitted or it may be a longer term storage (e.g. an archival storage) in other embodiments.
- the content to be provided is segmented into multiple media files in operation 220 .
- the server converts a stream into separate and distinct media files (i.e., segments) that can be distributed using a standard web server.
- the server segments the media stream at points that support effective decode of the individual media files (e.g., on packet and key frame boundaries such as PES packet boundaries and i-frame boundaries).
- the media files can be portions of the original stream with approximately equal duration.
- the server also creates a URI for each media file. These URIs allow client devices to access the media files.
- the server should have a complete segmented media file available before it can be served to the clients.
- the client may lag (in time) the broadcast by at least one media file length.
- media file size is based on a balance between lag time and having too many files.
- two session types live session and event session are supported.
- live session only a fixed size portion of the stream is preserved.
- content media files that are out of date are removed from the program playlist file, and can be removed from the server.
- the second type of session is an event session, where the client can tune into any point of the broadcast (e.g., start from the beginning, start from a mid-point). This type of session can be used for rebroadcast, for example.
- the media files are stored in the server memory in operation 230 .
- the media files can be protected by a security feature, such as encryption, before storing the files in operation 230 .
- the media files are stored as files that are ready to transmit using the network protocol (e.g., HTTP or HTTPS) supported by the Web server application on the server device (or supported by another device which does the transmission).
- One or more playlist files are generated to indicate the order in which the media files should be assembled to recreate the original content in operation 240 .
- the playlist file(s) can utilize Extended M3U tags and the tags described herein to provide information for a client device to access and reassemble the media files to provide a streaming experience on the client device.
- a URI for each media file is included in the playlist file(s) in the order in which the media files are to be played.
- the server can also create one or more URIs for the playlist file(s) to allow the client devices to access the playlist file(s).
- the playlist file(s) can be stored on the server in operation 250 . While the creation and storing of media files and playlist file(s) are presented in a particular order in FIG. 2A , a different order may also be used. For example, the playlist file(s) may be created before the media files are created or stored. As another example, the playlist file(s) and media files may be created before either are stored.
- the playlist file(s) can define a URI that allows authorized client devices to obtain a key file containing an encryption key to decrypt the media files.
- An encryption key can be transmitted using a secure connection (e.g., HTTPS).
- the playlist file(s) may be transmitted using HTTPS.
- media files may be arranged in an unpredictable order so that the client cannot recreate the stream without the playlist file(s).
- AES-128 CBC encryption may be applied to individual media files.
- the entire file is encrypted.
- Cipher block chaining is normally not applied across media files in one embodiment.
- the sequence of the media files is use as the IV as described above.
- the server adds an EXT-X-KEY tag with the key URI to the end of the playlist file. The server then encrypts all subsequent media files with that key until a change in encryption configuration is made.
- the server can make the new key available via a new URI that is distinct from all previous key URIs used in the presentation.
- the server also adds an EXT-X-KEY tag with the new key URI to the end of a playlist file and encrypts all subsequent media files with the new key.
- the server can add an EXT-X-KEY tag with the encryption method NONE at the end of the playlist file.
- the tag (with “NONE” as the method) does not include a URI parameter in one embodiment. All subsequent media files are not encrypted until a change in encryption configuration is made as described above.
- the server does not remove an EXT-X-KEY tag from a playlist file if the playlist file contains a URI to a media file encrypted with that key.
- the server can transmit the playlist file(s) and the media files over the network in response to client requests in operation 270 , as described in more detail with respect to FIG. 3A .
- a server transmits the playlist file to a client device in response to receiving a request from a client device for a playlist file.
- the client device may access/request the playlist file using a URI that has been provided to the client device.
- the URI indicates the location of the playlist file on the server.
- the server may provide the playlist file to the client device.
- the client device may the utilize tags and URIs (or other identifiers) in the playlist file to access the multiple media files.
- the server may limit the availability of media files to those that have been most recently added to the playlist file(s).
- each playlist file can include only one EXT-X-MEDIA-SEQUENCE tag and the value can be incremented by one for every media file URI that is removed from the playlist file.
- Media file URIs can be removed from the playlist file(s) in the order in which they were added.
- the server removes a media file URI from the playlist file(s) the media file remains available to clients for a period of time equal to the duration of the media file plus the duration of the longest playlist file in which the media file has appeared.
- the duration of a playlist file is the sum of the durations of the media files within that playlist file. Other durations can also be used.
- the server can maintain at least three main presentation media files in the playlist at all times unless the EXT-X-ENDLIST tag is present.
- FIG. 2B is a flow diagram of one embodiment of a technique for one or more server devices to provide dynamically updated playlists to one or more client devices.
- the playlists can be updated using either of the cumulative mode or the rolling mode described herein.
- the example of FIG. 2B is provided in terms of HTTP; however, other non-streaming protocols (e.g. HTTPS, etc.) can be utilized in a similar manner.
- the example of FIG. 2B is provided in terms of a server performing certain tasks. However, any number of servers may be utilized.
- the server that provides media files to client devices may be a different device than the server that segments the content into multiple media files.
- the server device receives content to be provided in operation 205 .
- the server may then temporarily store at least portions of the content in operation 215 .
- Operation 215 can be similar to operation 210 in FIG. 2A .
- the content to be provided is segmented into multiple media files in operation 225 .
- the media files can be stored in the server memory in operation 235 .
- the media files can be protected by a security feature, such as encryption, before storing the files in operation 235 .
- One or more playlist files are generated to indicate the order in which the media files should be assembled to recreate the original content in operation 245 .
- the playlist file(s) can be stored on the server in operation 255 . While the creation and storing of media files and playlist file(s) are presented in a particular order in FIG. 2B , a different order may also be used.
- the server (or another server) can transmit the playlist file(s) and the media files over the network in response to client requests in operation 275 , as described in more detail with respect to FIGS. 3A-3B .
- the playlist file(s) may be updated by a server for various reasons.
- the server may receive additional data to be provided to the client devices in operation 285 .
- the additional data can be received after the playlist file(s) are stored in operation 255 .
- the additional data may be, for example, additional portions of a live presentation, or additional information for an existing presentation. Additional data may include advertisements or statistics (e.g. scores or data relating to a sporting event).
- the additional data could be overlaid (through translucency) on the presentation or be presented in a sidebar user interface.
- the additional data can be segmented in the same manner as the originally received data.
- the additional data constitutes advertisements, or other content to be inserted into the program represented by the playlist
- the additional data can be stored (at least temporarily) in operation 215 , segmented in operation 225 and stored in operation 235 ; prior to storage of the segmented additional data, the segments of the additional data can be encrypted.
- an updated playlist containing the program and the additional data, would be generated.
- the playlist is updated based on the additional data and stored again in operation 255 . Changes to the playlist file(s) should be made atomically from the perspective of the client device.
- the updated playlist replaces, in one embodiment, the previous playlist.
- client devices can request the playlist multiple times. These requests enable the client devices to utilize the most recent playlist.
- the additional data may be metadata; in this case, the playlist does not need to be updated, but the segments can be updated to include metadata.
- the metadata may contain timestamps which can be matched with timestamps in the segments, and the metadata can be added to segments having matching timestamps.
- the updated playlist may also result in the removal of media files.
- a server should remove URIs, for the media files, from the playlist in the order in which they were added to the playlist.
- the server if the server removes an entire presentation, it makes the playlist file(s) unavailable to client devices.
- the server maintains the media files and the playlist file(s) for the duration of the longest playlist file(s) containing a media file to be removed to allow current client devices to finish accessing the presentation. Accordingly, every media file URI in the playlist file can be prefixed with an EXT-X-STREAM-INF tag to indicate the approximate cumulative duration of the media files indicated by the playlist file. In alternate embodiments, the media files and the playlist file(s) may be removed immediately.
- Subsequent requests for the playlist from client devices result in the server providing the updated playlist in operation 275 .
- playlists are updated on a regular basis, for example, a period of time related to the target duration. Periodic updates of the playlist file allow the server to provide access to servers to a dynamically changing presentation.
- FIG. 2C is a flow diagram of one embodiment of a technique for one or more server devices to provide media content to client devices using multiple bit rates, which is one form of the use of alternative streams.
- the example of FIG. 2C is provided in terms of HTTP; however, other non-streaming protocols can be utilized in a similar manner.
- the example of FIG. 2C is provided in terms of a server performing certain tasks. However, any number of servers may be utilized.
- the server that provides media files to client devices may be a different device than a server that segments the content into multiple media files.
- the server can offer multiple playlist files or a single playlist file with multiple media file lists in the single playlist file to provide different encodings of the same presentation.
- playlist file(s) may include each variant stream providing different bit rates to allow client devices to switch between encodings dynamically (this is described further in connection with FIGS. 9A-9D ).
- Playlist files having variant streams can include an EXT-X-STREAM-INF tag for each variant stream.
- Each EXT-X-STREAM-INF tag for the same presentation can have the same PROGRAM-ID attribute value.
- the PROGRAM-ID value for each presentation is unique within the variant streams.
- the server meets the following constraints when producing variant streams.
- Each variant stream can consist of the same content including optional content that is not part of the main presentation
- the server can make the same period of content available for all variant streams within an accuracy of the smallest target duration of the streams.
- the media files of the variant streams are, in one embodiment, either MPEG-2 Transport Streams or MPEG-2 Program Streams with sample timestamps that match for corresponding content in all variant streams.
- all variant streams should, in one embodiment, contain the same audio encoding. This allows client devices to switch between variant streams without losing content.
- the server device receives content to be provided in operation 202 .
- the server may then at least temporarily store the content in operation 212 .
- the content to be provided is segmented into multiple media files in operation 222 .
- Each media file is encoded for a selected bit rate (or a selected value of other encoding parameters) and stored on the server in operation 232 .
- the media files may be targeted for high-, medium- and low-bandwidth connections.
- the media files can be encrypted prior to storage.
- the encoding of the media files targeted for the various types of connections may be selected to provide a streaming experience at the target bandwidth level.
- a variant playlist is generated in operation 242 with tags as described herein that indicate various encoding levels.
- the tags may include, for example, an EXT-X-STREAM-INF tag for each encoding level with a URI to a corresponding media playlist file.
- This variant playlist can include URIs to media playlist files for the various encoding levels.
- a client device can select a target bit rate from the alternatives provided in the variant playlist indicating the encoding levels and retrieve the corresponding playlist file.
- a client device may change between bit rates during playback (e.g. as described with respect to FIGS. 9A-9D ).
- the variant playlist indicating the various encoding levels is stored on the server in operation 252 .
- each of the playlists referred to in the variant playlist can also be generated and then stored in operation 252 .
- the server may transmit the variant playlist that indicates the various encoding levels in operation 272 .
- the server may receive a request for one of the media playlists specified in the variant playlist corresponding to a selected bit rate in operation 282 .
- the server transmits the media playlist file corresponding to the request from the client device in operation 292 .
- the client device may then use the media playlist to request media files from the server.
- the server provides the media files to the client device in response to requests in operation 297 .
- FIG. 3A is a flow diagram of one embodiment of a technique for a client device to support streaming of content using non-streaming protocols.
- the example of FIG. 3A is provided in terms of HTTP; however, other non-streaming protocols can be utilized in a similar manner.
- the methods shown in FIGS. 3A-3B can be performed by one client device or by several separate client devices. For example, in the case of any one of these methods, a single client device may perform all of the operations (e.g. request a playlist file, request media files using URIs in the playlist file, assemble the media files to generate and provide a presentation/output) or several distinct client devices can perform some but not all of the operations (e.g. a first client device can request a playlist file and request media files using URIs in the playlist file and can store those media files for use by a second client device which can process the media files to generate and provide a presentation/output).
- a first client device can request a playlist file and request media files using URIs in the playlist file
- the client device may request a playlist file from a server in operation 300 .
- the request is made according to an HTTP-compliant protocol.
- the request utilizes a URI to an initial playlist file stored on the server.
- other non-streaming protocols can be supported.
- the server will transmit the corresponding playlist file to the client over a network.
- the network can be wired or wireless and can be any combination of wired or wireless networks. Further, the network may be a data network (e.g. IEEEE 802.11, IEEE 802.16) or a cellular telephone network (e.g., 3G).
- the client device can receive the playlist file in operation 310 .
- the playlist file can be stored in a memory of the client device in operation 320 .
- the memory can be, for example, a hard disk, a flash memory, a random-access memory.
- each time a playlist file is loaded or reloaded from the playlist URI the client checks to determine that the playlist file begins with a #EXTM3U tag and does not continue if the tag is absent.
- the playlist file includes one or more tags as well as one or more URIs to media files.
- the client device can include an assembler agent that uses the playlist file to reassemble the original content by requesting media files indicated by the URIs in the playlist file in operation 330 .
- the assembler agent is a plug-in module that is part of a standard Web browser application.
- the assembler agent may be a stand-alone application that interacts with a Web browser to receive and assemble the media files using the playlist file(s).
- the assembler agent may be a special-purpose hardware or firmware component that is embedded in the client device.
- the assembler causes media files from the playlist file to be downloaded from the server indicated by the URIs. If the playlist file contains the EXT-X-ENDLIST tag, any media file indicated by the playlist file may be played first. If the EXT-X-ENDLIST tag is not present, any media file except for the last and second-to-last media files may be played first. Once the first media file to play has been chosen, subsequent media files in the playlist file are loaded, in one embodiment, in the order that they appear in the playlist file (otherwise the content is presented out of order). In one embodiment, the client device attempts to load media files in advance of when they are required (and stores them in a buffer) to provide uninterrupted playback and to compensate for temporary variations in network latency and throughput.
- the downloaded media file(s) can be stored in a memory on the client device in operation 340 .
- the memory in which the content can be stored may be any type of memory on the client device, for example, random-access memory, a hard disk, or a video buffer. The storage may be temporary to allow playback or may be permanent.
- the playlist file contains the EXT-X-ALLOW-CACHE tag and its value is NO, the client does not store the downloaded media files after they have been played.
- the playlist contains the EXT-X-ALLOW-CACHE tag and its value is YES, the client device may store the media files indefinitely for later replay.
- the client device may use the value of the EXT-X-PROGRAM-DATE-TIME tag to display the program origination time to the user.
- the client can buffer multiple media files so that it is less susceptible to network jitter, in order to provide a better user experience.
- the decryption method is AES-128, then AES-128 CBC decryption is applied to the individual media files. The entire file is decrypted. In one embodiment, cipher block chaining is not applied across media files. The sequence number of the media file can be used as the initialization vector as described above.
- the content can be output from the client device in operation 350 .
- the output or presentation may be, for example, audio output via built-in speakers or head phones.
- the output may include video that is output via a screen or projected from the client device. Any type of output known in the art may be utilized.
- the client device determines whether there are any more media files in the stored, current playlist which have not been played or otherwise presented. If such media files exist (and if they have not been requested) then processing returns to operation 330 in which one or more media files are requested and the process repeats. If there are no such media files (i.e., all media files in the current playlist have been played), then processing proceeds to operation 352 , which determines whether the playlist file includes an end tag.
- the playlist includes an end tag (e.g., EXT-X-ENDLIST) in operation 352 , playback ceases when the media files indicated by the playlist file have been played. If the end tag is not in the playlist, then the client device requests a playlist again from the server and reverts hack to operation 300 to obtain a further or updated playlist for the program.
- end tag e.g., EXT-X-ENDLIST
- a server may update a playlist file to introduce supplementary content (e.g., additional media file identifiers corresponding to additional media content in a live broadcast) or additional content (e.g. content further down the stream).
- supplementary content e.g., additional media file identifiers corresponding to additional media content in a live broadcast
- additional content e.g. content further down the stream.
- a client can reload the updated playlist from the server. This can provide a mechanism by which playlist files can be dynamically updated, even during playback of the media content associated with a playlist file.
- a client can request a reload of the playlist file based on a number of triggers. The lack of an end tag is one such trigger.
- the client device periodically reloads the playlist file(s) unless the playlist file contains the EXT-X-ENDLIST tag.
- the client device loads a playlist file for the first time or reloads a playlist file and finds that the playlist file has changed since the last time it was loaded, the client can wait for a period of time before attempting to reload the playlist file again. This period is called the initial minimum reload delay. It is measured from the time that the client began loading the playlist file.
- the initial minimum reload delay is the duration of the last media file in the playlist file or three times the target duration, whichever is less.
- the media file duration is specified by the EXTINF tag. If the client reloads a playlist file and finds that it has not changed then the client can wait for a period of time before retrying.
- the minimum delay in one embodiment is three times the target duration or a multiple of the initial minimum reload delay, whichever is less. In one embodiment, this multiple is 0.5 for a first attempt, 1.5 for a second attempt and 3.0 for subsequent attempts; however, other multiples may be used.
- the client device examines the playlist file to determine the next media file to load.
- the first file to load is the media file selected to play first as described above. If the first media file to be played has been loaded and the playlist file does not contain the EXT-X-MEDIA-SEQUENCE tag then the client can verify that the current playlist file contains the URI of the last loaded media file at the offset where it was originally found, halting playback if the file is not found.
- the next media file to load can be the first media file URI following the last-loaded URI in the playlist file.
- the next media file to load can be the one with the lowest sequence number that is greater than the sequence number of the last media file loaded. If the playlist file contains an EXT-X-KEY tag that specifies a key file URI, the client device obtains the key file and uses the key inside the key file to decrypt the media files following the EXT-X-KEY tag until another EXT-X-KEY tag is encountered.
- the client device utilizes the same URI as previously used to download the playlist file.
- the client device may use the updated playlist file to retrieve media files and provide output based on the media files.
- Changes to the playlist file may include, for example, deletion of a URI to a media file, addition of a URI to a new media file, replacement of a URI to a replacement media file.
- one or more tags may be updated to reflect the change(s). For example, the duration tag may be updated if changes to the media files result in a change to the duration of the playback of the media files indicated by the playlist file.
- FIG. 3B is a flow diagram of one embodiment of a technique for a client device to support streaming of content using multiple bit rates which is one form of alternative streams.
- the example of FIG. 3B is provided in terms of HTTP; however, other non-streaming protocols can be utilized in a similar manner.
- the client device can request a playlist file in operation 370 .
- the playlist file may be retrieved utilizing a URI provided to the client device.
- the playlist file includes listings of variant streams of media files to provide the same content at different bit rates; in other words, a single playlist file includes URIs for the media files of each of the variant streams.
- the example shown in FIG. 3B uses this embodiment.
- the variant streams may be represented by multiple distinct playlist files separately provided to the client that each provide the same content at different bit rates, and a variant playlist can provide a URI for each of the distinct playlist files. This allows the client device to select the bit rate based on client conditions.
- the playlist file(s) can be retrieved by the client device in operation 375 .
- the playlist file(s) can be stored in the client device memory in operation 380 .
- the client device may select the bit rate to be used in operation 385 based upon current network connection speeds.
- Media files are requested from the server utilizing URIs included in the playlist file corresponding to the selected bit rate in operation 390 .
- the retrieved media files can be stored in the client device memory.
- Output is provided by the client device utilizing the media files in operation 394 and the client device determines whether to change the bit rate.
- a client device selects the lowest available bit rate initially. While playing the media, the client device can monitor available bandwidth (e.g. current network connection bit rates) to determine whether the available bandwidth can support use of a higher bit rate for playback. If so, the client device can select a higher bit rate and access the media files indicated by the higher bit rate media playlist file. The reverse can also be supported. If the playback consumes too much bandwidth, the client device can select a lower bit rate and access the media files indicated by the lower bit rate media playlist file.
- available bandwidth e.g. current network connection bit rates
- the client device may select a different bit rate in operation 385 .
- the client device may utilize a different list of URIs included in the playlist file that corresponds to the new selected bit rate.
- the client device may change bit rates during access of media files within a playlist.
- the client device determines whether there are any more unplayed media files in the current playlist which have not been retrieved and presented. If such media files exist, then processing returns to operation 390 and one or more media files are retrieved using the URIs for those files in the playlist. If there are no such media files (i.e. all media files in the current playlist haven been played), then processing proceeds to operation 396 in which it is determined whether the playlist includes an end tag. If it does, the playback of the program has ended and the process has completed; if it does not, then processing reverts to operation 370 , and the client device requests to reload the playlist for the program, and the process repeats through the method shown in FIG. 3B .
- FIG. 4 is a block diagram of one embodiment of a server stream agent. It will be understood that the elements of server stream agent 400 can be distributed across several server devices.
- a first server device can include the segmenter 430 , the indexer 440 and security 450 but not the file server 460 and a second server device can include the file server 450 but not the segmenter 430 , the indexer 440 and security 450 .
- the first server device would prepare the playlists and media files but would not transmit them to client devices while one or more second server devices would receive and optionally store the playlists and media files and would transmit the playlists and media files to the client devices.
- Server stream agent 400 includes control logic 410 , which implements logical functional control to direct operation of server stream agent 400 , and hardware associated with directing operation of server stream agent 400 .
- Logic may be hardware logic circuits or software routines or firmware.
- server stream agent 400 includes one or more applications 412 , which represent code sequence and/or programs that provide instructions to control logic 410 .
- Server stream agent 400 includes memory 414 , which represents a memory device or access to a memory resource for storing data or instructions.
- Memory 414 may include memory local to server stream agent 400 , as well as, or alternatively, including memory of the host system on which server stream agent 400 resides.
- Server stream agent 400 also includes one or more interfaces 416 , which represent access interfaces to/from (an input/output interface) server stream agent 400 with regard to entities (electronic or human) external to server stream agent 400 .
- Server stream agent 400 also can include server stream engine 420 , which represents one or more functions that enable server stream agent 400 to provide the real-time, or near real-time, streaming as described herein.
- server stream engine 420 represents one or more functions that enable server stream agent 400 to provide the real-time, or near real-time, streaming as described herein.
- the example of FIG. 4 provides several components that may be included in server stream engine 420 ; however, different or additional components may also be included.
- Example components that may be involved in providing the streaming environment include segmenter 430 , indexer 440 , security 450 and file server 460 . Each of these components may further include other components to provide other functions.
- a component refers to routine, a subsystem, etc., whether implemented in hardware, software, firmware or some combination thereof.
- Segmenter 430 divides the content to be provided into media files that can be transmitted as files using a Web server protocol (e.g., HTTP). For example, segmenter 430 may divide the content into predetermined, fixed-size blocks of data in a pre-determined file format.
- a Web server protocol e.g., HTTP
- Indexer 40 may provide one or more playlist files that provide an address or URI to the media files created by segmenter 430 .
- Indexer 440 may, for example, create one or more files with a listing of an order for identifiers corresponding to each file created by segmenter 430 . The identifiers may be created or assigned by either segmenter 430 or indexer 440 .
- Indexer 440 can also include one or more tags in the playlist files to support access and/or utilization of the media files.
- Security 450 may provide security features (e.g. encryption) such as those discussed above.
- Web server 460 may provide Web server functionality related to providing files stored on a host system to a remote client device.
- Web server 460 may support, for example, HTTP-compliant protocols.
- FIG. 5 is a block diagram of one embodiment of a client stream agent. It will be understood that the elements of a client stream agent can be distributed across several client devices. For example, a first client device can include an assembler 530 and security 550 and can provide a decrypted stream of media files to a second client device that includes an output generator 540 (but does not include an assembler 530 and security 550 ). In another example, a primary client device can retrieve playlists and provide them to a secondary client device which retrieves media files specified in the playlist and generates an output to present these media files.
- Client stream agent 500 includes control logic 510 , which implements logical functional control to direct operation of client stream agent 500 , and hardware associated with directing operation of client stream agent 500 . Logic may be hardware logic circuits or software routines or firmware. In one embodiment, client stream agent 500 includes one or more applications 512 , which represent code sequence or programs that provide instructions to control logic 510 .
- Client stream agent 500 includes memory 514 , which represents a memory device or access to a memory resource for storing data and/or instructions.
- Memory 514 may include memory local to client stream agent 500 , as well as, or alternatively, including memory of the host system on which client stream agent 500 resides.
- Client stream agent 500 also includes one or more interfaces 516 , which represent access interfaces to/from (an input/output interface) client stream agent 500 with regard to entities (electronic or human) external to client stream agent 500 .
- Client stream agent 500 also can include client stream engine 520 , which represents one or more functions that enable client stream agent 500 to provide the real-time, or near real-time, streaming as described herein.
- client stream engine 520 represents one or more functions that enable client stream agent 500 to provide the real-time, or near real-time, streaming as described herein.
- the example of FIG. 5 provides several components that may be included in client stream engine 520 ; however, different or additional components may also be included.
- Example components that may be involved in providing the streaming environment include assembler 530 , output generator 540 and security 550 . Each of these components may further include other components to provide other functions.
- a component refers to routine, a subsystem, etc., whether implemented in hardware, software, firmware or some combination thereof.
- Assembler 530 can utilize a playlist file received from a server to access the media files via Web server protocol (e.g., HTTP) from the server.
- Web server protocol e.g., HTTP
- assembler 530 may cause to be downloaded media files as indicated by URIs in the playlist file.
- Assembler 530 may respond to tags included in the playlist file.
- Output generator 540 may provide the received media files as audio or visual output (or both audio and visual) on the host system. Output generator 540 may, for example, cause audio to be output to one or more speakers and video to be output to a display device. Security 550 may provide security features such as those discussed above.
- FIG. 6 illustrates one embodiment of a playlist file with multiple tags.
- the example playlist of FIG. 6 includes a specific number and ordering of tags. This is provided for description purposes only. Some playlist files may include more, fewer or different combinations of tags and the tags can be arranged in a different order than shown in FIG. 6 .
- Begin tag 610 can indicate the beginning of a playlist file.
- begin tag 610 is a #EXTM3U tag.
- Duration tag 620 can indicate the duration of the playback list. That is, the duration of the playback of the media files indicated by playback list 600 .
- duration tag 620 is an EXT-X-TARGETDURATION tag; however, other tags can also be used.
- Date/Time tag 625 can provide information related to the date and time of the content provided by the media files indicated by playback list 600 .
- Date/Time tag 625 is an EXT-X-PROGRAM-DATE-TIME tag; however, other tags can also be used.
- Sequence tag 630 can indicate the sequence of playlist file 600 in a sequence of playlists.
- sequence tag 630 is an EXT-X-MEDIA-SEQUENCE tag; however, other tags can also be used.
- Security tag 640 can provide information related to security and/or encryption applied to media files indicated by playlist file 600 .
- the security tag 640 can specify a decryption key to decrypt files specified by the media file indicators.
- security tag 640 is an EXT-X-KEY tag; however, other tags can also be used.
- Variant list tag 645 can indicate whether variant streams are provided by playlist 600 as well as information related to the variant streams (e.g., how many, bit rate).
- variant list tag 645 is an EXT-X-STREAM-INF tag.
- Media file indicators 650 can provide information related to media files to be played.
- media file indicators 650 include URIs to multiple media files to be played.
- the order of the URIs in playlist 600 corresponds to the order in which the media files should be accessed and/or played.
- Subsequent playlist indicators 660 can provide information related to one or more playback files to be used after playback file 600 .
- subsequent playlist indicators 660 can include URIs to one or more playlist files to be used after the media files of playlist 600 have been played.
- Memory tag 670 can indicate whether and/or how long a client device may store media files after playback of the media file content.
- memory lag 670 is an EXT-X-ALLOW-CACHE tag.
- End tag 680 indicates whether playlist file 600 is the last playlist file for a presentation.
- end tag 680 is an EXT-X-ENDLIST tag.
- the following section contains several example playlist files according to one embodiment.
- FIG. 7 is a flow diagram of one embodiment of a playback technique for assembled streams as described herein.
- playback of the received media files can be controlled by the user to start stop, rewind, etc.
- the playlist file is received by the client device in operation 700 .
- the media files indicated by the playlist file are retrieved in operation 710 .
- Output is generated based on the received media files in operation 720 . Receiving and generating output based on media files can be accomplished as described above.
- control input is detected in operation 730 , the client device can determine if the input indicates a stop in operation 740 . If the input is a stop, the process concludes and playback stops. If the input indicates a rewind or forward request in operation 750 , the client device can generate output based on previously played media files still stored in memory in operation 760 . If these files are no longer in a cache, then processing reverts to operation 710 to retrieve the media files and repeats the process. In an alternate embodiment, playback can support a pause feature that halts playback without concluding playback as with a stop input.
- One client device can perform each of these methods or the operations of each of these methods can be distributed across multiple client devices as described herein; for example, in the distributed case, one client device can retrieve the variant playlist and the two media playlists and provide those to another client device which retrieves media files specified by the two media playlists and switches between the two streams provided by the retrieved media files. It will also be understood that, in alternative embodiments, the order of the operations shown may be modified or there can be more or fewer operations than shown in these figures.
- the methods can use a variant playlist to select different streams.
- a variant playlist can be retrieved and processed in operation 901 to determine available streams for a program (e.g. a sporting event).
- Operation 901 can be done by a client device.
- a first stream can be selected from the variant playlist in operation 903 , and a client device can then retrieve a media playlist for the first stream.
- the client device can process the media playlist for the first stream in operation 905 and also measure or otherwise determine a bit rate of the network connection for the first stream in operation 907 . It will be appreciated that the sequence of operations may be performed in an order which is different than what is shown in FIG. 9A ; for example, operation 907 may be performed during operation 903 , etc.
- the client device selects an alternative media playlist from the variant playlist based on the measured bit rate from operation 907 ; this alternative media playlist may be at a second bit rate that is higher than the existing bit rate of the first stream.
- the alternative media playlist can be selected if it is a better match than the current playlist for the first stream based on current conditions (e.g. the bit rate measured in operation 907 ).
- the alternative media playlist for an alternate stream is retrieved and processed. This typically means that the client device can be receiving and processing both the first stream and the alternative stream so both are available for presentation; one is presented while the other is ready to be presented.
- the client device selects a transition point to switch between the versions of the streams in operation 915 and stops presenting the first stream and begins presenting the alternative stream. Examples of how this switch is accomplished are provided in conjunction with FIGS. 9B-9D . In some embodiments, the client device can stop receiving the first stream before making the switch.
- FIG. 9B shows that the client device retrieves, stores and presents content specified by the first media playlist (e.g. the first stream) in operations 921 and 923 , and while the content specified by the first playlist is being presented the client device in operation 925 also retrieves and stores content specified by the second media playlist (e.g. the second stream).
- the retrieval and storage (e.g. in a temporary buffer) of the content specified by the second media playlist while presenting the content obtained from the first media playlist creates an overlap 955 in time of the program's content (shown in FIG. 9D ) that allows the client device to switch between the versions of the program without a substantial interruption of the program.
- the switch between the versions of the program can be achieved in many cases without the user noticing that a switch has occurred (although the user may notice a higher resolution image after the switch in some cases) or without a substantial interruption in the presentation of the program.
- the client device determines a transition point at which to switch from content specified by the first media playlist to content specified by the second media playlist; an example of a transition point (transition point 959 ) is shown in FIG. 9D .
- the content specified by the second media playlist is then presented in operation 931 after the switch.
- the method shown in FIGS. 9C and 9D represents one embodiment for determining the transition point; this embodiment relies upon a pattern matching on audio samples from the two streams 951 and 953 to determine the transition point. It will be appreciated that alternative embodiments can use pattern matching on video samples or can use the timestamps in the two streams, etc. to determine the transition point.
- the method can include, in operation 941 , storing content (e.g. stream 951 ) specified by the first media playlist in a buffer; the buffer can be used for the presentation of the content and also for the pattern matching operation.
- the stream 951 includes both audio samples 951 A and video samples 951 B.
- the video samples can use a compression technique which relies on i-frames or key frames which have all necessary content to display a single video frame.
- the content in stream 951 can include timestamps specifying a time (e.g. time elapsed since the beginning of the program), and these timestamps can mark the beginning of each of the samples (e.g. the beginning of each of the audio samples 951 A and the beginning of each of the video samples 951 B).
- timestamps specifying a time (e.g. time elapsed since the beginning of the program)
- these timestamps can mark the beginning of each of the samples (e.g. the beginning of each of the audio samples 951 A and the beginning of each of the video samples 951 B).
- a comparison of the timestamps between the two streams may not be useful in determining a transition point because they may not be precise enough or because of the difference in the boundaries of the samples in the two streams; however, a comparison of the timestamps ranges can be used to verify there is an overlap 955 in time between the two streams.
- the client device stores in a buffer content specified by the second media playlist; this content is for the same program as the content obtained from the first media playlist and it can include timestamps also.
- timestamps if not present in a stream, can be added to a playlist for a stream; for example, in one embodiment an ID3 tag which includes one or more timestamps can be added to an entry in a playlist, such as a variant playlist or a media playlist.
- the entry may, for example, be in a URI for a first sample of an audio stream.
- FIG. 9D shows an example of content 953 obtained from the second media playlist, and this includes audio samples 953 A and video samples 953 B.
- the client device can perform a pattern matching on the audio samples in the two streams 951 and 953 to select from the overlap 955 the transition point 959 which can be, in one embodiment, the next self contained video frame (e.g. i-frame 961 ) after the matched audio segments (e.g. segments 957 ).
- presentation of the program uses the second stream obtained from the second media playlist.
- the foregoing method can be used in one embodiment for both a change from a slower to a faster bit rate and for a change from a faster to a slower bit rate, but in another embodiment the method can be used only for a change from a slower to a faster bit rate and another method (e.g. do not attempt to locate a transition point but attempt to store and present content from the slower bit rate stream as soon as possible) can be used for a change from a faster to a slower bit.
- FIG. 8 is a block diagram of one embodiment of an electronic system.
- the electronic system illustrated in FIG. 8 is intended to represent a range of electronic systems (either wired or wireless) including, for example, desktop computer systems, laptop computer systems, cellular telephones, personal digital assistants (PDAs) including cellular-enabled PDAs, set top boxes, entertainment systems or other consumer electronic devices.
- Alternative electronic systems may include more, fewer and/or different components.
- the electronic system of FIG. 8 may be used to provide the client device and/or the server device.
- Electronic system 800 includes bus 805 or other communication device to communicate information, and processor 810 coupled to bus 805 that may process information. While electronic system 800 is illustrated with a single processor, electronic system 800 may include multiple processors and/or co-processors. Electronic system 800 further may include random access memory (RAM) or other dynamic storage device 820 (referred to as main memory), coupled to bus 805 and may store information and instructions that may be executed by processor 810 . Main memory 820 may also be used to store temporary variables or other intermediate information during execution of instructions by processor 810 .
- RAM random access memory
- main memory main memory
- Electronic system 800 may also include read only memory (ROM) and/or other static storage device 830 coupled to bus 805 that may store static information and instructions for processor 810 .
- Data storage device 840 may be coupled to bus 805 to store information and instructions.
- Data storage device 840 such as flash memory or a magnetic disk or optical disc and corresponding drive may be coupled to electronic system 800 .
- Electronic system 800 may also be coupled via bus 805 to display device 850 , such as a cathode ray tube (CRT) or liquid crystal display (LCD), to display information to a user.
- Display device 850 such as a cathode ray tube (CRT) or liquid crystal display (LCD)
- Electronic system 800 can also include an alphanumeric input device 860 , including alphanumeric and other keys, which may be coupled to bus 805 to communicate information and command selections to processor 810 .
- cursor control 870 is Another type of user input device, such as a touchpad, a mouse, a trackball, or cursor direction keys to communicate direction information and command selections to processor 810 and to control cursor movement on display 850 .
- Electronic system 800 further may include one or more network interface(s) 880 to provide access to a network, such as a local area network.
- Network interface(s) 880 may include, for example, a wireless network interface having antenna 885 , which may represent one or more antenna(e).
- Electronic system 800 can include multiple wireless network interfaces such as a combination of WiFi, Bluetooth and cellular telephony interfaces.
- Network interface(s) 880 may also include, for example, a wired network interface to communicate with remote devices via network cable 887 , which may be, for example, an Ethernet cable, a coaxial cable, a fiber optic cable, a serial cable, or a parallel cable.
- network interface(s) 880 may provide access to a local area network, for example, by conforming to IEEE 802.11b and/or IEEE 802.11g standards, and/or the wireless network interface may provide access to a personal area network, for example, by conforming to Bluetooth standards. Other wireless network interfaces and/or protocols can also be supported.
- network interface(s) 880 may provide wireless communications using, for example, Time Division, Multiple Access (TDMA) protocols, Global System for Mobile Communications (GSM) protocols, Code Division, Multiple Access (CDMA) protocols, and/or any other type of wireless communications protocol.
- TDMA Time Division, Multiple Access
- GSM Global System for Mobile Communications
- CDMA Code Division, Multiple Access
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EP17199267.0A EP3300372B1 (de) | 2008-12-31 | 2009-12-28 | Aktualisieren einer spielliste um inhalte per streaming auszusenden |
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EP09799470A EP2392112A2 (de) | 2008-12-31 | 2009-12-28 | Verfahren zum streaming von multimedia-daten über ein nicht-streaming-protokoll |
KR1020117018907A KR101233582B1 (ko) | 2008-12-31 | 2009-12-28 | 비-스트리밍 프로토콜을 통해 멀티미디어 데이터를 스트리밍하기 위한 방법 |
KR1020117018058A KR101215232B1 (ko) | 2008-12-31 | 2009-12-28 | 비-스트리밍 프로토콜을 통해 멀티미디어 데이터를 스트리밍하기 위한 방법 |
RU2011132008/08A RU2481720C2 (ru) | 2008-12-31 | 2009-12-28 | Потоковая передача данных в режиме реального времени или в режиме, близком к реальному времени |
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SG2011048105A SG172820A1 (en) | 2008-12-31 | 2009-12-28 | Method for streaming multimedia data over a non-streaming protocol |
CN201210047602.3A CN102611701B (zh) | 2008-12-31 | 2009-12-28 | 通过非流化协议流化多媒体数据的方法 |
BRPI0923917-0A BRPI0923917B1 (pt) | 2008-12-31 | 2009-12-28 | Método implementado por máquina, meio de armazenamento não transitório legível por máquina, aparelho, e sistema de processamento de dados para transmissão contínua em tempo real ou próximo ao tempo real |
CN200980156253.5A CN102308547B (zh) | 2008-12-31 | 2009-12-28 | 通过非流化协议流化多媒体数据的方法 |
US12/878,002 US8260877B2 (en) | 2008-12-31 | 2010-09-08 | Variant streams for real-time or near real-time streaming to provide failover protection |
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US9558282B2 (en) | 2017-01-31 |
EP2475149A3 (de) | 2013-06-05 |
US8301725B2 (en) | 2012-10-30 |
US20100169459A1 (en) | 2010-07-01 |
EP2475149A2 (de) | 2012-07-11 |
US20170171094A1 (en) | 2017-06-15 |
US20100169458A1 (en) | 2010-07-01 |
US8099476B2 (en) | 2012-01-17 |
US20100169453A1 (en) | 2010-07-01 |
US20140143388A1 (en) | 2014-05-22 |
US8650192B2 (en) | 2014-02-11 |
US20120110141A1 (en) | 2012-05-03 |
US20210263981A1 (en) | 2021-08-26 |
US10977330B2 (en) | 2021-04-13 |
US8099473B2 (en) | 2012-01-17 |
US20120324058A1 (en) | 2012-12-20 |
EP2475149B1 (de) | 2017-11-01 |
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