Statistics
| Branch: | Revision:

ffmpeg / libavformat / oggparseflac.c @ 20cd83e2

History | View | Annotate | Download (2.47 KB)

1 bcfc40ae Måns Rullgård
/*
2
 *    Copyright (C) 2005  Matthieu CASTET
3 115329f1 Diego Biurrun
 *
4 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7 bcfc40ae Måns Rullgård
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
10 bcfc40ae Måns Rullgård
 *
11 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
12 bcfc40ae Måns Rullgård
 * 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 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
18 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 bcfc40ae Måns Rullgård
 */
20
21
#include <stdlib.h>
22
#include "avformat.h"
23
#include "bitstream.h"
24
#include "ogg2.h"
25
26
#define FLAC_STREAMINFO_SIZE 0x22
27
28
static int
29
flac_header (AVFormatContext * s, int idx)
30
{
31
    ogg_t *ogg = s->priv_data;
32
    ogg_stream_t *os = ogg->streams + idx;
33
    AVStream *st = s->streams[idx];
34
    GetBitContext gb;
35
    int mdt;
36
37
    if (os->buf[os->pstart] == 0xff)
38
        return 0;
39
40
    init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
41
    get_bits(&gb, 1); /* metadata_last */
42
    mdt = get_bits(&gb, 7);
43
44
    if (mdt == 0x7f) {
45
        skip_bits(&gb, 4*8); /* "FLAC" */
46
        if(get_bits(&gb, 8) != 1) /* unsupported major version */
47
            return -1;
48
        skip_bits(&gb, 8 + 16);      /* minor version + header count */
49
        skip_bits(&gb, 4*8); /* "fLaC" */
50 115329f1 Diego Biurrun
51 bcfc40ae Måns Rullgård
        /* METADATA_BLOCK_HEADER */
52
        if (get_bits(&gb, 32) != FLAC_STREAMINFO_SIZE)
53
            return -1;
54
55
        skip_bits(&gb, 16*2+24*2);
56
57 01f4895c Michael Niedermayer
        st->codec->sample_rate = get_bits_long(&gb, 20);
58
        st->codec->channels = get_bits(&gb, 3) + 1;
59 115329f1 Diego Biurrun
60 01f4895c Michael Niedermayer
        st->codec->codec_type = CODEC_TYPE_AUDIO;
61
        st->codec->codec_id = CODEC_ID_FLAC;
62 bcfc40ae Måns Rullgård
63 01f4895c Michael Niedermayer
        st->codec->extradata =
64 bcfc40ae Måns Rullgård
            av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
65 01f4895c Michael Niedermayer
        memcpy (st->codec->extradata, os->buf + os->pstart + 5 + 4 + 4 + 4,
66 bcfc40ae Måns Rullgård
                FLAC_STREAMINFO_SIZE);
67 01f4895c Michael Niedermayer
        st->codec->extradata_size = FLAC_STREAMINFO_SIZE;
68 3644cb8f Måns Rullgård
69
        st->time_base.num = 1;
70
        st->time_base.den = st->codec->sample_rate;
71 bcfc40ae Måns Rullgård
    } else if (mdt == 4) {
72
        vorbis_comment (s, os->buf + os->pstart + 4, os->psize - 4);
73
    }
74
75
    return 1;
76
}
77
78
ogg_codec_t flac_codec = {
79
    .magic = "\177FLAC",
80
    .magicsize = 5,
81
    .header = flac_header
82
};