RTP Payload Format for SVC Video draft-ietf-avt-rtp-svc-18.txt

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Status of this Memo

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Abstract

   This memo describes an RTP payload format for Scalable Video Coding(SVC) as defined in_Annex G of ITU-T Recommendation H.264, which is technically identical to Amendment 3 of ISO/IEC International Standard 14496-10.  The RTP payload format allows for packetization of one or more Network Abstraction Layer (NAL) units in each RTP packet payload, as well as fragmentation of a NAL unit in multiple RTP packets.  Furthermore, it supports transmission of an SVC stream over a single as well as multiple RTP sessions.  The payload format defines a new media subtype name "H264-SVC", but is still backwards compatible to [I-D.ietf-avt-rtp-rfc3984bis] since the base layer, when encapsulated in its own RTP stream, must use the H.264 media subtype name ("H264") and the packetization method specified in [I-D.ietf-avt-rtp-rfc3984bis].  The payload format has wide applicability in videoconferencing, Internet video streaming, and high bit-rate entertainment-quality video, among others.

Table of Contents

   Status of this Memo...............................................1
   Abstract..........................................................2
   Table of Contents.................................................2
   1 . Introduction..................................................5
      1.1 . The SVC Codec............................................6
         1.1.1 . Overview............................................6
         1.1.2 . Parameter Sets......................................8
         1.1.3 . NAL Unit Header.....................................9
      1.2 . Overview of the Payload Format..........................12
         1.2.1 Design Principles....................................12
         1.2.2 Transmission Modes and Packetization Modes...........13
         1.2.3 New Payload Structures...............................15
   2 . Conventions..................................................16
   3 . Definitions and Abbreviations................................16
      3.1 Definitions...............................................16
         3.1.1 Definitions from the SVC Specification...............17
         3.1.2 Definitions Specific to This Memo....................19
      3.2 Abbreviations.............................................23
   4 . RTP Payload Format...........................................23
      4.1 RTP Header Usage..........................................23
      4.2 NAL Unit Extension and Header Usage.......................24
         4.2.1 NAL Unit Extension...................................24
         4.2.2 NAL Unit Header Usage................................24
      4.3 Payload Structures........................................26
      4.4 Transmission Modes........................................28
      4.5 Packetization Modes.......................................29
         4.5.1 Packetization Modes for Single-Session Transmission..29
         4.5.2 Packetization Modes for Multi-Session Transmission...30
      4.6 Single NAL Unit Packets...................................33
      4.7 Aggregation Packets.......................................33
         4.7.1 Non-Interleaved Multi-Time Aggregation Packets (NI-
         MTAPs).....................................................34
      4.8 Fragmentation Units (FUs).................................36
      4.9 Payload Content Scalability Information (PACSI) NAL Unit..36
      4.10 Empty NAL unit...........................................44
      4.11 Decoding Order Number (DON)..............................45
         4.11.1 Cross-Session DON (CS-DON) for Multi-Session
         Transmission...............................................45
   5 . Packetization Rules..........................................47
      5.1 Packetization Rules for Single-Session Transmission.......47
      5.2 Packetization Rules for Multi-Session Transmission........48
         5.2.1 NI-T/NI-TC Packetization Rules.......................48
         5.2.2 NI-C/NI-TC Packetization Rules.......................51
         5.2.3 I-C Packetization Rules..............................52
         5.2.4 Packetization Rules for Non-VCL NAL Units............52
         5.2.5 Packetization Rules for Prefix NAL Units.............53
   6 . De-Packetization Process.....................................53
      6.1 De-Packetization Process for Single-Session Transmission..53
      6.2 De-Packetization Process for Multi-Session Transmission...53
         6.2.1 Decoding Order Recovery for the NI-T and NI-TC Modes.54
            6.2.1.1 Informative Algorithm for NI-T Decoding Order
            Recovery within an Access Unit..........................57
         6.2.2 Decoding Order Recovery for the NI-C, NI-TC and I-C
       [FS:PAGE]  Modes......................................................60
   7 . Payload Format Parameters....................................62
      7.1 Media Type Registration...................................62
      7.2 SDP Parameters............................................76
         7.2.1 Mapping of Payload Type Parameters to SDP............76
         7.2.2 Usage with the SDP Offer/Answer Model................77
         7.2.3 Dependency Signaling in Multi-Session Transmission...85
         7.2.4 Usage in Declarative Session Descriptions............85
      7.3 Examples..................................................86
         7.3.1 Example for Offering a Single SVC Session............86
         7.3.2 Example for Offering a Single SVC Session using
         scalable-layer-id..........................................87
         7.3.3 Example for Offering Multiple Sessions in MST........88
         7.3.4 Example for Offering Multiple Sessions in MST including
         operation with Answerer using scalable-layer-id............90
      7.4 Parameter Set Considerations..............................91
   8 . Security Considerations......................................91
   9 . Congestion Control...........................................92
   10 . IANA Consideration..........................................93
   11 . Informative Appendix: Application Examples..................93
      11.1 Introduction.............................................93
      11.2 Layered Multicast........................................94
      11.3 Streaming................................................94
      11.4 Videoconferencing (Unicast to MANE, Unicast to Endpoints)95
      11.5 Mobile TV (Multicast to MANE, Unicast to Endpoint).......96
   12 . Acknowledgements............................................97
   13 . References..................................................98
      13.1 Normative References.....................................98
      13.2 Informative References...................................99
   14 . Authors'''' Addresses.........................................100