Session description message extensions
First Claim
1. One or more computer readable storage 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:
- 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 message that are separate from the ASF file header, the plurality of extensions including;
a caching information extension that specifies information about caching of the multimedia presentation, the information identifying whether the multimedia presentation can be cached, a length the multimedia presentation is considered fresh, when cached copies of media streams of the multimedia presentation are considered stale, whether to use a stale cached copy of a media stream, and whether to determine if a newer version of the media stream is available when the media stream is stale;
an encapsulation extension that specifies codec initialization parameters for one or more of a plurality of different codecs; and
a bandwidth sharing extension that is separate from the ASF file header and that specifies media streams of the multimedia presentation that share bandwidth such that a maximum bandwidth of the specified media streams is less than a sum of maximum bandwidths of each of the specified media streams; and
for each object in the subset of the plurality of objects;
retrieve one or more parameters from the object, anduse the retrieved parameters as the parameters for one of the plurality of extensions.
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Accused Products
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.
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Citations
17 Claims
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1. One or more computer readable storage 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 message that are separate from the ASF file header, the plurality of extensions including; a caching information extension that specifies information about caching of the multimedia presentation, the information identifying whether the multimedia presentation can be cached, a length the multimedia presentation is considered fresh, when cached copies of media streams of the multimedia presentation are considered stale, whether to use a stale cached copy of a media stream, and whether to determine if a newer version of the media stream is available when the media stream is stale; an encapsulation extension that specifies codec initialization parameters for one or more of a plurality of different codecs; and a bandwidth sharing extension that is separate from the ASF file header and that specifies media streams of the multimedia presentation that share bandwidth such that a maximum bandwidth of the specified media streams is less than a sum of maximum bandwidths of each of the specified media streams; 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 (2, 3, 4, 5)
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6. One or more computer readable storage 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 plurality of extensions, the plurality of extensions including; a caching information extension that is separate from any ASF file header of the multimedia presentation and that specifies information about caching of the multimedia presentation, the information identifying whether the multimedia presentation can be cached, a length the multimedia presentation is considered fresh, when cached copies of any of the plurality of media streams of the multimedia presentation are considered stale, whether to use a stale cached copy of a media stream, and whether to determine if a newer version of the media stream is available when the media stream is stale; an encapsulation extension that specifies codec initialization parameters for one or more of a plurality of different codecs; and a bandwidth sharing extension that is separate from any ASF file header and that specifies media streams of the multimedia presentation that share bandwidth such that a maximum bandwidth of the specified media streams is less than a sum of maximum bandwidths of each of the specified media streams; and include, as part of data streamed to the client device, the session description message. - View Dependent Claims (7, 8, 9, 10)
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11. One or more computer readable storage 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 plurality of extensions, the plurality of extensions including; a caching information extension that specifies information about caching of the multimedia presentation, the information identifying whether the multimedia presentation can be cached, a length the multimedia presentation is considered fresh, when cached copies of any of the plurality of media streams of the multimedia presentation are considered stale, whether to use a stale cached copy of a media stream, and whether to determine if a newer version of the media stream is available when the media stream is stale; an encapsulation extension that is separate from any ASF file header of the multimedia presentation and that specifies codec parameters for one or more of a plurality of different codecs; and a bandwidth sharing extension that is separate from the ASF file header and that specifies media streams of the multimedia presentation that share bandwidth such that a maximum bandwidth of the specified media streams is less than a sum of maximum bandwidths of each of the specified media streams; and include, as part of data streamed to the client device, the session description message. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification