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Encoder Limits Expression in CLUE IETF88: Enhancements in SDP and Encoding Management

This document discusses the new protocol enhancements in the Context of CLUE (Codec, Layer, and User) for IETF88. It outlines how encoding limits can be expressed within SDP, facilitating separate send-only lines for each encoding. The text explains the necessity of additional Offers/Answers (O/As) for far-end devices to specify their own encoding capabilities, providing examples of SDP offers and their implications. Key advantages include reduced resource commitment and improved encoding management, although the challenge of developing codec-agnostic language remains.

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Encoder Limits Expression in CLUE IETF88: Enhancements in SDP and Encoding Management

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  1. Expressing encoder limits in CLUE IETF88

  2. Encoding limits in SDP • Separate sendonly lines for each encoding • Allows expression of encoder send limits • Necessitates additional O/A(s) for far end to add their own encodings

  3. Initial O/A (A->B) Answer (from B) Offer (from A) m=video ... a=sendrecv m=video ... a=sendrecv

  4. 2nd O/A (A->B) Answer (from B) Offer (from A) m=video ... a=sendrecv m=video ... a=sendonly m=video ... a=sendonly m=video ... a=sendonly m=video ... a=sendrecv m=video ... a=recvonly m=video ... a=recvonly m=video ... a=recvonly

  5. 3rd O/A (B->A) Answer (from A) Offer (from B) m=video ... a=sendrecv m=video ... a=recvonly m=video ... a=recvonly m=video ... a=recvonly m=video ... a=sendonly m=video ... a=sendonly m=video ... a=sendonly m=video ... a=sendrecv m=video ... a=sendonly m=video ... a=sendonly m=video ... a=sendonly m=video ... a=recvonly m=video ... a=recvonly m=video ... a=recvonly

  6. Encoding limits in CLUE • Express encoding limits in ADVERTISEMENT message • Still have an m-line per encoding • No longer need m-lines to be ‘sendonly’ • Express receive limits in SDP as normal

  7. Offer SDP and Advertisment Offer SDP CLUE ADVERTISEMENT m=video ... ... H264@720p30 a=label:A a=sendrecv m=video ... ... H264@720p30 a=label:B a=sendrecv m=video ... ... H264@720p30 a=label:C a=sendrecv Capture Scene 1: Capture 1: Left (Encoding Group 1) Capture 2: Center (Encoding Group 1) Capture 3: Right (Encoding Group 1) Capture 4: Switched Capture Scene Entry 1: 1,2,3 Capture Scene Entry 2: 4 Simultaneous Sets: 1,2,3,4 Encoding Group 1: Encoding 1: H264, 1080p30, label=A Encoding 2: H264, 1080p30, label=B Encoding 3: H264, 1080p30, label=C

  8. Answer SDP and Configure Answer SDP CLUE CONFIGURE m=video ... ...H264@720p30 a=sendrecv m=video ... ... 264@720p30 a=sendrecv m=video ... ... 264@720p30 a=sendrecv Capture 1, Encoding 1 Capture 2, Encoding 2 Capture 3, Encoding 3

  9. Advantages/Disadvantages • Can use sendrecv for many m-lines, reduces number of O/As needed • Less need to commit resources (ICE, etc) to encodings that aren’t used • Can express full send limitations • Need to reinvent codec-specific language • This will be a large and neverending pain • Or, we need suitably abstract language to not be codec-specific

  10. Motivation: Optimal decisions If Alice offers 4 encodings, is that: • 1 x 1080p • 3 x 360p OR • 4 x 720p Also reduces bandwidth and decoder resources allocated unnecessarily

  11. What level of detail is required? • Expressing individual encoder limits is done only to let receiver make better decisions on how to allocate resources • Purely informative, and does not need to represent the reservation of actual resources • As such, are generalities sufficient?

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