Ogg Encapsulation for the Opus Audio Codec
draft-ietf-codec-oggopus-05

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Document Type Active Internet-Draft (codec WG)
Last updated 2014-10-14
Replaces draft-terriberry-oggopus
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codec                                                      T. Terriberry
Internet-Draft                                       Mozilla Corporation
Intended status: Standards Track                                  R. Lee
Expires: April 18, 2015                                      Voicetronix
                                                                R. Giles
                                                     Mozilla Corporation
                                                        October 15, 2014

               Ogg Encapsulation for the Opus Audio Codec
                      draft-ietf-codec-oggopus-05

Abstract

   This document defines the Ogg encapsulation for the Opus interactive
   speech and audio codec.  This allows data encoded in the Opus format
   to be stored in an Ogg logical bitstream.  Ogg encapsulation provides
   Opus with a long-term storage format supporting all of the essential
   features, including metadata, fast and accurate seeking, corruption
   detection, recapture after errors, low overhead, and the ability to
   multiplex Opus with other codecs (including video) with minimal
   buffering.  It also provides a live streamable format, capable of
   delivery over a reliable stream-oriented transport, without requiring
   all the data, or even the total length of the data, up-front, in a
   form that is identical to the on-disk storage format.

Status of This Memo

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   This Internet-Draft will expire on April 18, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Terriberry, et al.       Expires April 18, 2015                 [Page 1]
Internet-Draft                  Ogg Opus                    October 2014

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Packet Organization . . . . . . . . . . . . . . . . . . . . .   3
   4.  Granule Position  . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Repairing Gaps in Real-time Streams . . . . . . . . . . .   5
     4.2.  Pre-skip  . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.3.  PCM Sample Position . . . . . . . . . . . . . . . . . . .   8
     4.4.  End Trimming  . . . . . . . . . . . . . . . . . . . . . .   8
     4.5.  Restrictions on the Initial Granule Position  . . . . . .   9
     4.6.  Seeking and Pre-roll  . . . . . . . . . . . . . . . . . .  10
   5.  Header Packets  . . . . . . . . . . . . . . . . . . . . . . .  10
     5.1.  Identification Header . . . . . . . . . . . . . . . . . .  10
       5.1.1.  Channel Mapping . . . . . . . . . . . . . . . . . . .  14
     5.2.  Comment Header  . . . . . . . . . . . . . . . . . . . . .  20
       5.2.1.  Tag Definitions . . . . . . . . . . . . . . . . . . .  22
   6.  Packet Size Limits  . . . . . . . . . . . . . . . . . . . . .  23
   7.  Encoder Guidelines  . . . . . . . . . . . . . . . . . . . . .  24
     7.1.  LPC Extrapolation . . . . . . . . . . . . . . . . . . . .  25
     7.2.  Continuous Chaining . . . . . . . . . . . . . . . . . . .  25
   8.  Implementation Status . . . . . . . . . . . . . . . . . . . .  26
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  26
   10. Content Type  . . . . . . . . . . . . . . . . . . . . . . . .  27
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  27
   12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  27
   13. Copying Conditions  . . . . . . . . . . . . . . . . . . . . .  27
   14. References  . . . . . . . . . . . . . . . . . . . . . . . . .  27
     14.1.  Normative References . . . . . . . . . . . . . . . . . .  28
     14.2.  Informative References . . . . . . . . . . . . . . . . .  28
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