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Systems Integration Business Unit Technologiezentrum 3/6/05, page 1

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62nd IETF - Minneapolis, MN, USA MMUSIC WG

New New mode mode for for rfc3640: AAC-BSAC rfc3640: AAC-BSAC with with MPEG-21 MPEG-21 gBSD gBSD draft-feiten-avt-bsacmode-for-rfc3640-00.txt

Ingo Wolf Bernhard Feiten wolfi@t-systems.com bernhard.feiten@t-systems.com

Systems Integration Business Unit Technologiezentrum 3/6/05, page 2

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draft-feiten-avt-bsacmode-for-rfc3640-00.txt

• motivation
• MPEG-4 and RFC 3640
• conclusions
• utline

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motivation

draft-feiten-avt-bsacmode-for-rfc3640-00.txt

• usage in the scope of an adaptation

framework based on MPEG-21 Part- 7 Digital Item Adaptation

• supporting bitstream adaptation in

active network nodes (content adaptation nodes)

• new mode shall allow attaching a

bitstream description to the BSAC playload in order to support the scaling of the bitrate dynamically

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MPEG-4 and rfc 3640

draft-feiten-avt-bsacmode-for-rfc3640-00.txt

• RFC 3640 so far defines five modes:

Generic

generic Constant Bitrate Celp CELP-cbr Variable Bitrate Celp CELP-vbr Low Bitrate AAC AAC-lbr High Bitrate AAC AAC-hbr

• modes are signalled with the SDP fmtp parameter

e.g. mode=BSAC-gbsd

m=audio 49230 RTP/AVP 96 a=rtpmap:96 mpeg4-generic/44100/2 a=fmtp:96 streamtype=5; profile-level-id=22; mode=BSAC-gbsd; config=2C90; sizeLength=11; indexLength=5; indexDeltaLength=5; auxiliaryDataSizeLength=16; constantDuration=1024

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conclusion

draft-feiten-avt-bsacmode-for-rfc3640-00.txt

• MPEG-21 digital item adaptation framework can be

used for content agnostic adaptation of the media bitrate

• the abstract framework is specified without transport

layer binding need for standardized bindings to existing transport protocols

• proposal for a new mode "Scalable Bitrate BSAC"

named "BSAC-gbsd“ shall be considered

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draft-feiten-avt-bsacmode-for-rfc3640-00.txt

Thank you for your attention ! Questions and comments are welcome, discussion on email-reflector avt@ietf.org is recommended