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RTP Payload Format for nonlinear 12 bits Audio on DV draft-kobayashi-dv-audio12-00.txt

RTP Payload Format for nonlinear 12 bits Audio on DV draft-kobayashi-dv-audio12-00.txt. Akimichi Ogawa Keio University. Overview of draft. Packetization scheme for 12 bits unlinear DV audio over RTP The draft specifies the differenciated part with the L16 document. Audio in DV format.

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RTP Payload Format for nonlinear 12 bits Audio on DV draft-kobayashi-dv-audio12-00.txt

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  1. RTP Payload Format fornonlinear 12 bits Audio on DVdraft-kobayashi-dv-audio12-00.txt Akimichi Ogawa Keio University

  2. Overview of draft • Packetization scheme for 12 bits unlinear DV audio over RTP • The draft specifies the differenciated part with the L16 document

  3. Audio in DV format • PCM 16 bit linear • compatible to L16 • PCM 12 bit unlinear (this draft) • PCM 20 bit linear (unused yet)

  4. Why 12 bit unlinear ? • 12 bit audio is used in DV video format • DV video has 12 bit audio option • Unbundled video and audio is RECOMMENDED in RTP/DV • How to send 12 bit unlinear encoded DV audio stream ? • It is not difficult to convert 12 bit to 16 bit • But, data size increses 33 %

  5. Sample for converting 16 -> 12 Please see draft for details 16 bits linear (X) 12 bits nonlinear (Y) ------------------------------------------------------------ 32,767 (7FFFh) Y = INT(X/64) + (600h) 2,047 (7FFh) 16,384 (4000h) 1,792 (700h) ------------------------------------------------------------ 16,383 (3FFFh) Y = INT(X/32) + (500h) 1,791 (6FFh) 8,192 (2000h) 1,536 (600h) ------------------------------------------------------------ 8,191 (1FFFh) Y = INT(X/16) + (400h) 1,535 (5FFh) 4,096 (1000h) 1,280 (500h)

  6. ISSUES • SDP section will be added in next version

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