Free Lossless Audio Codec
draft-ietf-cellar-flac-00

Document Type Active Internet-Draft (cellar WG)
Last updated 2019-07-30
Replaces draft-weaver-cellar-flac
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cellar                                                        J. Coalson
Internet-Draft
Intended status: Standards Track
Expires: January 30, 2020                            Xiph.Org Foundation
                                                               A. Weaver
                                                           July 29, 2019

                       Free Lossless Audio Codec
                       draft-ietf-cellar-flac-00

Abstract

   This document defines FLAC, which stands for Free Lossless Audio
   Codec, a free, open source codec for lossless audio compression and
   decompression.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 30, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Coalson & Weaver        Expires January 30, 2020                [Page 1]
Internet-Draft                    FLAC                         July 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Notation and Conventions  . . . . . . . . . . . . . . . . . .   3
   3.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Architecture  . . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   5
   7.  Blocking  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  Interchannel Decorrelation  . . . . . . . . . . . . . . . . .   6
   9.  Prediction  . . . . . . . . . . . . . . . . . . . . . . . . .   6
   10. Residual Coding . . . . . . . . . . . . . . . . . . . . . . .   7
   11. Format  . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     11.1.  Conventions  . . . . . . . . . . . . . . . . . . . . . .  11
     11.2.  STREAM . . . . . . . . . . . . . . . . . . . . . . . . .  12
     11.3.  METADATA_BLOCK . . . . . . . . . . . . . . . . . . . . .  12
     11.4.  METADATA_BLOCK_HEADER  . . . . . . . . . . . . . . . . .  12
     11.5.  BLOCK_TYPE . . . . . . . . . . . . . . . . . . . . . . .  12
     11.6.  METADATA_BLOCK_DATA  . . . . . . . . . . . . . . . . . .  13
     11.7.  METADATA_BLOCK_STREAMINFO  . . . . . . . . . . . . . . .  13
     11.8.  METADATA_BLOCK_PADDING . . . . . . . . . . . . . . . . .  14
     11.9.  METADATA_BLOCK_APPLICATION . . . . . . . . . . . . . . .  15
     11.10. METADATA_BLOCK_SEEKTABLE . . . . . . . . . . . . . . . .  15
     11.11. SEEKPOINT  . . . . . . . . . . . . . . . . . . . . . . .  15
     11.12. METADATA_BLOCK_VORBIS_COMMENT  . . . . . . . . . . . . .  16
     11.13. METADATA_BLOCK_CUESHEET  . . . . . . . . . . . . . . . .  16
     11.14. CUESHEET_TRACK . . . . . . . . . . . . . . . . . . . . .  18
     11.15. CUESHEET_TRACK_INDEX . . . . . . . . . . . . . . . . . .  19
     11.16. METADATA_BLOCK_PICTURE . . . . . . . . . . . . . . . . .  19
     11.17. PICTURE_TYPE . . . . . . . . . . . . . . . . . . . . . .  19
     11.18. FRAME  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     11.19. FRAME_HEADER . . . . . . . . . . . . . . . . . . . . . .  20
       11.19.1.  FRAME HEADER RESERVED . . . . . . . . . . . . . . .  21
       11.19.2.  BLOCKING STRATEGY . . . . . . . . . . . . . . . . .  21
       11.19.3.  INTERCHANNEL SAMPLE BLOCK SIZE  . . . . . . . . . .  22
       11.19.4.  SAMPLE RATE . . . . . . . . . . . . . . . . . . . .  22
       11.19.5.  CHANNEL ASSIGNMENT  . . . . . . . . . . . . . . . .  23
       11.19.6.  SAMPLE SIZE . . . . . . . . . . . . . . . . . . . .  23
       11.19.7.  FRAME HEADER RESERVED2  . . . . . . . . . . . . . .  24
       11.19.8.  CODED NUMBER  . . . . . . . . . . . . . . . . . . .  24
       11.19.9.  BLOCK SIZE INT  . . . . . . . . . . . . . . . . . .  24
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