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  1. /*
  2.  *    Copyright (C) 2005  Matthieu CASTET
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include <stdlib.h>
  22. #include "libavcodec/get_bits.h"
  23. #include "libavcodec/flac.h"
  24. #include "avformat.h"
  25. #include "internal.h"
  26. #include "oggdec.h"
  27.  
  28. #define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
  29.  
  30. static int
  31. flac_header (AVFormatContext * s, int idx)
  32. {
  33.     struct ogg *ogg = s->priv_data;
  34.     struct ogg_stream *os = ogg->streams + idx;
  35.     AVStream *st = s->streams[idx];
  36.     GetBitContext gb;
  37.     FLACStreaminfo si;
  38.     int mdt;
  39.  
  40.     if (os->buf[os->pstart] == 0xff)
  41.         return 0;
  42.  
  43.     init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
  44.     skip_bits1(&gb); /* metadata_last */
  45.     mdt = get_bits(&gb, 7);
  46.  
  47.     if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
  48.         uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
  49.         skip_bits_long(&gb, 4*8); /* "FLAC" */
  50.         if(get_bits(&gb, 8) != 1) /* unsupported major version */
  51.             return -1;
  52.         skip_bits_long(&gb, 8 + 16); /* minor version + header count */
  53.         skip_bits_long(&gb, 4*8); /* "fLaC" */
  54.  
  55.         /* METADATA_BLOCK_HEADER */
  56.         if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
  57.             return -1;
  58.  
  59.         avpriv_flac_parse_streaminfo(st->codec, &si, streaminfo_start);
  60.  
  61.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  62.         st->codec->codec_id = AV_CODEC_ID_FLAC;
  63.         st->need_parsing = AVSTREAM_PARSE_HEADERS;
  64.  
  65.         if (ff_alloc_extradata(st->codec, FLAC_STREAMINFO_SIZE) < 0)
  66.             return AVERROR(ENOMEM);
  67.         memcpy(st->codec->extradata, streaminfo_start, st->codec->extradata_size);
  68.  
  69.         avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  70.     } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
  71.         ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 4, os->psize - 4);
  72.     }
  73.  
  74.     return 1;
  75. }
  76.  
  77. static int
  78. old_flac_header (AVFormatContext * s, int idx)
  79. {
  80.     struct ogg *ogg = s->priv_data;
  81.     AVStream *st = s->streams[idx];
  82.     struct ogg_stream *os = ogg->streams + idx;
  83.     AVCodecParserContext *parser = av_parser_init(AV_CODEC_ID_FLAC);
  84.     int size;
  85.     uint8_t *data;
  86.  
  87.     if (!parser)
  88.         return -1;
  89.  
  90.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  91.     st->codec->codec_id = AV_CODEC_ID_FLAC;
  92.  
  93.     parser->flags = PARSER_FLAG_COMPLETE_FRAMES;
  94.     av_parser_parse2(parser, st->codec,
  95.                      &data, &size, os->buf + os->pstart, os->psize,
  96.                      AV_NOPTS_VALUE, AV_NOPTS_VALUE, -1);
  97.  
  98.     av_parser_close(parser);
  99.  
  100.     if (st->codec->sample_rate) {
  101.         avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  102.         return 0;
  103.     }
  104.  
  105.     return 1;
  106. }
  107.  
  108. const struct ogg_codec ff_flac_codec = {
  109.     .magic = "\177FLAC",
  110.     .magicsize = 5,
  111.     .header = flac_header,
  112.     .nb_header = 2,
  113. };
  114.  
  115. const struct ogg_codec ff_old_flac_codec = {
  116.     .magic = "fLaC",
  117.     .magicsize = 4,
  118.     .header = old_flac_header,
  119.     .nb_header = 0,
  120. };
  121.