libavcodec/flac.h

   1 /*
   2  * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
   3  * Copyright (c) 2008 Justin Ruggles
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file libavcodec/flac.h
  24  * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
  25  */
  26
  27 #ifndef AVCODEC_FLAC_H
  28 #define AVCODEC_FLAC_H
  29
  30 #include "avcodec.h"
  31
  32 #define FLAC_STREAMINFO_SIZE 34
  33
  34 enum {
  35     FLAC_METADATA_TYPE_STREAMINFO = 0,
  36     FLAC_METADATA_TYPE_PADDING,
  37     FLAC_METADATA_TYPE_APPLICATION,
  38     FLAC_METADATA_TYPE_SEEKTABLE,
  39     FLAC_METADATA_TYPE_VORBIS_COMMENT,
  40     FLAC_METADATA_TYPE_CUESHEET,
  41     FLAC_METADATA_TYPE_PICTURE,
  42     FLAC_METADATA_TYPE_INVALID = 127
  43 };
  44
  45 enum FLACExtradataFormat {
  46     FLAC_EXTRADATA_FORMAT_STREAMINFO  = 0,
  47     FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1
  48 };
  49
  50 /**
  51  * Data needed from the Streaminfo header for use by the raw FLAC demuxer
  52  * and/or the FLAC decoder.
  53  */
  54 #define FLACSTREAMINFO \
  55     int max_blocksize;      /**< maximum block size, in samples          */\
  56     int max_framesize;      /**< maximum frame size, in bytes            */\
  57     int samplerate;         /**< sample rate                             */\
  58     int channels;           /**< number of channels                      */\
  59     int bps;                /**< bits-per-sample                         */\
  60     int64_t samples;        /**< total number of samples                 */\
  61
  62 typedef struct FLACStreaminfo {
  63     FLACSTREAMINFO
  64 } FLACStreaminfo;
  65
  66 /**
  67  * Parse the Streaminfo metadata block
  68  * @param[out] avctx   codec context to set basic stream parameters
  69  * @param[out] s       where parsed information is stored
  70  * @param[in]  buffer  pointer to start of 34-byte streaminfo data
  71  */
  72 void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
  73                               const uint8_t *buffer);
  74
  75 /**
  76  * Validate the FLAC extradata.
  77  * @param[in]  avctx codec context containing the extradata.
  78  * @param[out] format extradata format.
  79  * @param[out] streaminfo_start pointer to start of 34-byte STREAMINFO data.
  80  * @return 1 if valid, 0 if not valid.
  81  */
  82 int ff_flac_is_extradata_valid(AVCodecContext *avctx,
  83                                enum FLACExtradataFormat *format,
  84                                uint8_t **streaminfo_start);
  85
  86 #endif /* AVCODEC_FLAC_H */