libavformat/oggparseflac.c

   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 "oggdec.h"
  26
  27 #define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
  28
  29 static int
  30 flac_header (AVFormatContext * s, int idx)
  31 {
  32     struct ogg *ogg = s->priv_data;
  33     struct ogg_stream *os = ogg->streams + idx;
  34     AVStream *st = s->streams[idx];
  35     GetBitContext gb;
  36     FLACStreaminfo si;
  37     int mdt;
  38
  39     if (os->buf[os->pstart] == 0xff)
  40         return 0;
  41
  42     init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
  43     skip_bits1(&gb); /* metadata_last */
  44     mdt = get_bits(&gb, 7);
  45
  46     if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
  47         uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
  48         skip_bits_long(&gb, 4*8); /* "FLAC" */
  49         if(get_bits(&gb, 8) != 1) /* unsupported major version */
  50             return -1;
  51         skip_bits_long(&gb, 8 + 16); /* minor version + header count */
  52         skip_bits_long(&gb, 4*8); /* "fLaC" */
  53
  54         /* METADATA_BLOCK_HEADER */
  55         if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
  56             return -1;
  57
  58         ff_flac_parse_streaminfo(st->codec, &si, streaminfo_start);
  59
  60         st->codec->codec_type = CODEC_TYPE_AUDIO;
  61         st->codec->codec_id = CODEC_ID_FLAC;
  62
  63         st->codec->extradata =
  64             av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
  65         memcpy(st->codec->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE);
  66         st->codec->extradata_size = FLAC_STREAMINFO_SIZE;
  67
  68         st->time_base.num = 1;
  69         st->time_base.den = st->codec->sample_rate;
  70     } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
  71         vorbis_comment (s, 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     AVStream *st = s->streams[idx];
  81     st->codec->codec_type = CODEC_TYPE_AUDIO;
  82     st->codec->codec_id = CODEC_ID_FLAC;
  83
  84     return 0;
  85 }
  86
  87 const struct ogg_codec ff_flac_codec = {
  88     .magic = "\177FLAC",
  89     .magicsize = 5,
  90     .header = flac_header
  91 };
  92
  93 const struct ogg_codec ff_old_flac_codec = {
  94     .magic = "fLaC",
  95     .magicsize = 4,
  96     .header = old_flac_header
  97 };