Session description message extensions
First Claim
Patent Images
1. A method comprising:
- generating a session description message that describes properties of a multimedia presentation to be streamed to a client device, the multimedia presentation having a plurality of media streams, and the session description message having;
a mutual exclusivity extension that is separate from an ASF file header and that specifies which of the plurality of media streams are mutually exclusive;
a marker extension that is separate from the ASF file header and that specifies an index into the multimedia presentation;
a script command extension that is separate from the ASF file header and that specifies data that is to be presented during playback of the multimedia presentation;
a leaky bucket extension that is separate from the ASP file header and that specifies how much data of the multimedia presentation to buffer when playing the multimedia presentation at a particular bit rate;
a caching information extension that is separate from the ASF file header and that specifies information about caching of the multimedia presentation;
an encapsulation extension that is separate from the ASF file header and that specifies codec parameters for one or more of a plurality of different codecs;
a bandwidth sharing extension that is separate from the ASF file header and that specifies media streams of the plurality of media streams that share bandwidth;
a stream prioritization extension that is separate from the ASF file header and that specifies which of the plurality of media streams should have priority over which other of the plurality of media steams; and
include, as part of data streamed to the client device, the session description message.
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Abstract
Session description message extensions include information describing a multimedia presentation or a single media presentation. The session description message is typically sent from one device to another device to which the multimedia or single media presentation will be streamed. Several extensions are described that extend the information that can be included in the session description message.
92 Citations
39 Claims
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1. A method comprising:
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generating a session description message that describes properties of a multimedia presentation to be streamed to a client device, the multimedia presentation having a plurality of media streams, and the session description message having; a mutual exclusivity extension that is separate from an ASF file header and that specifies which of the plurality of media streams are mutually exclusive; a marker extension that is separate from the ASF file header and that specifies an index into the multimedia presentation; a script command extension that is separate from the ASF file header and that specifies data that is to be presented during playback of the multimedia presentation; a leaky bucket extension that is separate from the ASP file header and that specifies how much data of the multimedia presentation to buffer when playing the multimedia presentation at a particular bit rate; a caching information extension that is separate from the ASF file header and that specifies information about caching of the multimedia presentation; an encapsulation extension that is separate from the ASF file header and that specifies codec parameters for one or more of a plurality of different codecs; a bandwidth sharing extension that is separate from the ASF file header and that specifies media streams of the plurality of media streams that share bandwidth; a stream prioritization extension that is separate from the ASF file header and that specifies which of the plurality of media streams should have priority over which other of the plurality of media steams; and include, as part of data streamed to the client device, the session description message.
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2. One or more computer readable media having stored thereon a plurality of instructions for generating a session description message that describes properties of a multimedia presentation to be streamed to a client device, the plurality of instructions, when executed by one or more processors, causing the one or more processors to:
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access an ASF file header of the multimedia presentation; identify a subset of a plurality of objects of the ASF file header; generate, for each object in the subset of the plurality of objects, a different one of a plurality of extensions for the session description, wherein one of the plurality of extensions comprises a leaky bucket extension that specifies how much data of the multimedia presentation to buffer when playing the multimedia presentation at a particular bit rate; and for each object in the subset of the plurality of objects; retrieve one or more parameters from the object, and use the retrieved parameters as the parameters for one of the plurality of extensions. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. One or more computer readable media having stored thereon a plurality of instructions that, when executed by one or more processors, causes the one or more processors to:
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generate a session description message that describes properties of a multimedia presentation to be streamed to a client device, the multimedia presentation having a plurality of media streams, and the session description message having a mutual exclusivity extension that is separate from an ASF file header and that specifies which of the plurality of media streams are mutually exclusive, and wherein a value ExclusionType represents a type of mutual exclusivity, a value StreamNumbers represents the media streams that are mutually exclusive, and the mutual exclusivity extension comprises; a=group;
ExclusionType StreamNumber; andinclude, as part of data streamed to the client device, the session description message. - View Dependent Claims (11, 12, 13, 14)
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15. One or more computer readable media having stored thereon a plurality of instructions that, when executed by one or more processors, causes the one or more processors to:
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generate a session description message that describes properties of a multimedia presentation to be streamed to a client device, the multimedia presentation having a plurality of media streams, and the session description message having a marker extension that is separate from an ASF file header and that specifies an index into the multimedia presentation, and wherein a value name represents a name of a marker, a value time represents a presentation time of the marker, a value desc represents the index, and the marker extension comprises; a=marker;
name time;
desc; andinclude, as part of data streamed to the client device, the session description message. - View Dependent Claims (16, 17)
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18. One or more computer readable media having stored thereon a plurality of instructions that, when executed by one or more processors, causes the one or more processors to:
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generate a session description message that describes properties of a multimedia presentation to be streamed to a client device, the multimedia presentation having a plurality of media streams, and the session description message having a script command extension that is separate from an ASF file header and that specifies data that is to be presented during playback of the multimedia presentation, and wherein a value type represents a type of command, a value time represents a presentation time of the multimedia presentation when the data is to be presented, a value command represents data to be displayed at the presentation time and the script command extension comprises; a=script;
type time;
command; andinclude, as part of streaming data to be streamed to the client device, the session description message. - View Dependent Claims (19, 20, 21)
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22. One or more computer readable media having stored thereon a plurality of instructions that, when executed by one or more processors, causes the one or more processors to:
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generate a session description message that describes properties of a multimedia presentation to be streamed to a client device, the multimedia presentation having a plurality of media streams, and the session description message having a caching information extension that is separate from an ASF file header and that specifies information about caching of the multimedia presentation, and wherein a value rights represents the information about caching of the multimedia presentation, and the caching information extension comprises; a=cachectrl;
Rights; andinclude, as part of data streamed to the client device, the session description message. - View Dependent Claims (23, 24, 25, 26)
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27. One or more computer readable media having stored thereon a plurality of instructions that, when executed by one or more processors, causes the one or more processors to:
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generate a session description message that describes properties of a multimedia presentation to be streamed to a client device, the multimedia presentation having a plurality of media streams, and the session description message having an encapsulation extension that is separate from an ASF file header and that specifies codec parameters for one or more of a plurality of different codecs, and wherein a value pt represents a payload type number, a value MIME represents an identifier of one of the plurality of different codecs, a value config-info represents initialization data for the one of the plurality of different codecs, and the encapsulation extension comprises; a=fmtp;
pt MIME config=config-info; andinclude, as part of data streamed to the client device, the session description message. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. One or more computer readable media having stored thereon a plurality of instructions that, when executed by one or more processors, causes the one or more processors to:
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generate a session description message that describes properties of a multimedia presentation to be streamed to a client device, the multimedia presentation having a plurality of media streams, and the session description message having a stream prioritization extension that is separate from an ASF file header and that specifies which of the plurality of media streams should have priority over which other of the plurality of media streams, and wherein the stream prioritization extension comprises a=prio followed by a list of media streams in priority order; and include, as part of data streamed to the client device, the session description message. - View Dependent Claims (38, 39)
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Specification