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SDP attribute for qualifying Media Formats with Generic Parameters (gpmd)

SDP attribute for qualifying Media Formats with Generic Parameters (gpmd). draft-rajeshkumar-mmusic-gpmd-01.txt 55th IETF – November 18, 2002 Rajesh Kumar (rkumar@cisco.com) Presented by Flemming Andreasen (fandreas@cisco.com). Background.

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SDP attribute for qualifying Media Formats with Generic Parameters (gpmd)

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  1. SDP attribute for qualifying Media Formats with Generic Parameters(gpmd) draft-rajeshkumar-mmusic-gpmd-01.txt 55th IETF – November 18, 2002 Rajesh Kumar (rkumar@cisco.com) Presented by Flemming Andreasen (fandreas@cisco.com)

  2. Background • Receiver of audio media stream can benefit from knowing that media stream is voice band data. It should not be a requirement to know this though (optimization). • Need to indicate that media stream is for voice-band data. • Special case of a more general issue: • Want to be able to define new media format parameters that can apply to existing MIME types for media formats. • Support for such parameters must be optional - a hint. • Lack of receiver support for these parameters should not render the media received useless - rather an optimization. • If receiver support is important, offer/answer can be used to determine if other side supports it and hence whether sender side optimization can be used.

  3. Possible Solutions • fmtp parameters: Parameters must be defined up front, so does not work here. • SDP attributes: No standard way of specifying these on a per media format basis (only per media stream). • gpmd: New SDP attribute that defines a way of specifying new optional media format parameters on a per media format basis. • Example: m=audio 3456 RTP/AVP 0 15 98 a=rtpmap:98 PCMU/8000 a=gpmd:98 vbd=yes

  4. Current Issues • gpmd attribute definition too open-ended right now: • Need to narrow down scope and clearly specify what constitutes appropriate use of gpmd (and what does not). • Need to specify Offer/Answer interactions. • Registration procedures for new gpmd parameters: • Specification Required, Designated expert, … ?

  5. Next Steps • Update draft • Any further comments or issues ? • Status in WG ?

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