RTP Payload Format for G.719
RFC 5404
Network Working Group M. Westerlund
Request for Comments: 5404 I. Johansson
Category: Standards Track Ericsson AB
January 2009
RTP Payload Format for G.719
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
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Abstract
This document specifies the payload format for packetization of the
G.719 full-band codec encoded audio signals into the Real-time
Transport Protocol (RTP). The payload format supports transmission
of multiple channels, multiple frames per payload, and interleaving.
Westerlund & Johansson Standards Track [Page 1]
RFC 5404 RTP Payload Format for G.719 January 2009
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Definitions and Conventions . . . . . . . . . . . . . . . . . 3
3. G.719 Description . . . . . . . . . . . . . . . . . . . . . . 3
4. Payload Format Capabilities . . . . . . . . . . . . . . . . . 4
4.1. Multi-Rate Encoding and Rate Adaptation . . . . . . . . . 4
4.2. Support for Multi-Channel Sessions . . . . . . . . . . . . 5
4.3. Robustness against Packet Loss . . . . . . . . . . . . . . 5
4.3.1. Use of Forward Error Correction (FEC) . . . . . . . . 5
4.3.2. Use of Frame Interleaving . . . . . . . . . . . . . . 6
5. Payload Format . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1. RTP Header Usage . . . . . . . . . . . . . . . . . . . . . 8
5.2. Payload Structure . . . . . . . . . . . . . . . . . . . . 8
5.2.1. Basic ToC Element . . . . . . . . . . . . . . . . . . 9
5.3. Basic Mode . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4. Interleaved Mode . . . . . . . . . . . . . . . . . . . . . 10
5.5. Audio Data . . . . . . . . . . . . . . . . . . . . . . . . 11
5.6. Implementation Considerations . . . . . . . . . . . . . . 12
5.6.1. Receiving Redundant Frames . . . . . . . . . . . . . . 12
5.6.2. Interleaving . . . . . . . . . . . . . . . . . . . . . 12
5.6.3. Decoding Validation . . . . . . . . . . . . . . . . . 13
6. Payload Examples . . . . . . . . . . . . . . . . . . . . . . . 13
6.1. 3 Mono Frames with 2 Different Bitrates . . . . . . . . . 13
6.2. 2 Stereo Frame-Blocks of the Same Bitrate . . . . . . . . 14
6.3. 4 Mono Frames Interleaved . . . . . . . . . . . . . . . . 15
7. Payload Format Parameters . . . . . . . . . . . . . . . . . . 16
7.1. Media Type Definition . . . . . . . . . . . . . . . . . . 16
7.2. Mapping to SDP . . . . . . . . . . . . . . . . . . . . . . 19
7.2.1. Offer/Answer Considerations . . . . . . . . . . . . . 19
7.2.2. Declarative SDP Considerations . . . . . . . . . . . . 22
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 23
9. Congestion Control . . . . . . . . . . . . . . . . . . . . . . 23
10. Security Considerations . . . . . . . . . . . . . . . . . . . 24
11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 25
12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 25
12.1. Normative References . . . . . . . . . . . . . . . . . . . 25
12.2. Informative References . . . . . . . . . . . . . . . . . . 26
Westerlund & Johansson Standards Track [Page 2]
RFC 5404 RTP Payload Format for G.719 January 2009
1. Introduction
This document specifies the payload format for packetization of the
G.719 full-band (FB) codec encoded audio signals into the Real-time
Transport Protocol (RTP) [RFC3550]. The payload format supports
transmission of multiple channels, multiple frames per payload, and
packet loss robustness methods using redundancy or interleaving.
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