changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / oggparseflac.c
1 /*
2 * Copyright (C) 2005 Matthieu CASTET
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19 #include <stdlib.h>
20 #include "avformat.h"
21 #include "bitstream.h"
22 #include "ogg2.h"
23
24 #define FLAC_STREAMINFO_SIZE 0x22
25
26 static int
27 flac_header (AVFormatContext * s, int idx)
28 {
29 ogg_t *ogg = s->priv_data;
30 ogg_stream_t *os = ogg->streams + idx;
31 AVStream *st = s->streams[idx];
32 GetBitContext gb;
33 int mdt;
34
35 if (os->buf[os->pstart] == 0xff)
36 return 0;
37
38 init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
39 get_bits(&gb, 1); /* metadata_last */
40 mdt = get_bits(&gb, 7);
41
42 if (mdt == 0x7f) {
43 skip_bits(&gb, 4*8); /* "FLAC" */
44 if(get_bits(&gb, 8) != 1) /* unsupported major version */
45 return -1;
46 skip_bits(&gb, 8 + 16); /* minor version + header count */
47 skip_bits(&gb, 4*8); /* "fLaC" */
48
49 /* METADATA_BLOCK_HEADER */
50 if (get_bits(&gb, 32) != FLAC_STREAMINFO_SIZE)
51 return -1;
52
53 skip_bits(&gb, 16*2+24*2);
54
55 st->codec->sample_rate = get_bits_long(&gb, 20);
56 st->codec->channels = get_bits(&gb, 3) + 1;
57
58 st->codec->codec_type = CODEC_TYPE_AUDIO;
59 st->codec->codec_id = CODEC_ID_FLAC;
60
61 st->codec->extradata =
62 av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
63 memcpy (st->codec->extradata, os->buf + os->pstart + 5 + 4 + 4 + 4,
64 FLAC_STREAMINFO_SIZE);
65 st->codec->extradata_size = FLAC_STREAMINFO_SIZE;
66 } else if (mdt == 4) {
67 vorbis_comment (s, os->buf + os->pstart + 4, os->psize - 4);
68 }
69
70 return 1;
71 }
72
73 ogg_codec_t flac_codec = {
74 .magic = "\177FLAC",
75 .magicsize = 5,
76 .header = flac_header
77 };