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oggparseflac.c
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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
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 
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 
64 
65  st->codec->extradata =
67  memcpy(st->codec->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE);
69 
70  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
71  } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
72  ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 4, os->psize - 4);
73  }
74 
75  return 1;
76 }
77 
78 static int
80 {
81  AVStream *st = s->streams[idx];
84 
85  return 0;
86 }
87 
88 const struct ogg_codec ff_flac_codec = {
89  .magic = "\177FLAC",
90  .magicsize = 5,
91  .header = flac_header,
92  .nb_header = 2,
93 };
94 
95 const struct ogg_codec ff_old_flac_codec = {
96  .magic = "fLaC",
97  .magicsize = 4,
98  .header = old_flac_header,
99  .nb_header = 0,
100 };