1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*
* Copyright (C) 2005 Matthieu CASTET
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include "libavcodec/bitstream.h"
#include "avformat.h"
#include "oggdec.h"
#define FLAC_STREAMINFO_SIZE 0x22
static int
flac_header (AVFormatContext * s, int idx)
{
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
AVStream *st = s->streams[idx];
GetBitContext gb;
int mdt;
if (os->buf[os->pstart] == 0xff)
return 0;
init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
get_bits(&gb, 1); /* metadata_last */
mdt = get_bits(&gb, 7);
if (mdt == 0x7f) {
skip_bits(&gb, 4*8); /* "FLAC" */
if(get_bits(&gb, 8) != 1) /* unsupported major version */
return -1;
skip_bits(&gb, 8 + 16); /* minor version + header count */
skip_bits(&gb, 4*8); /* "fLaC" */
/* METADATA_BLOCK_HEADER */
if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
return -1;
skip_bits(&gb, 16*2+24*2);
st->codec->sample_rate = get_bits_long(&gb, 20);
st->codec->channels = get_bits(&gb, 3) + 1;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_FLAC;
st->codec->extradata =
av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
memcpy (st->codec->extradata, os->buf + os->pstart + 5 + 4 + 4 + 4,
FLAC_STREAMINFO_SIZE);
st->codec->extradata_size = FLAC_STREAMINFO_SIZE;
st->time_base.num = 1;
st->time_base.den = st->codec->sample_rate;
} else if (mdt == 4) {
vorbis_comment (s, os->buf + os->pstart + 4, os->psize - 4);
}
return 1;
}
static int
old_flac_header (AVFormatContext * s, int idx)
{
AVStream *st = s->streams[idx];
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_FLAC;
return 0;
}
const struct ogg_codec ff_flac_codec = {
.magic = "\177FLAC",
.magicsize = 5,
.header = flac_header
};
const struct ogg_codec ff_old_flac_codec = {
.magic = "fLaC",
.magicsize = 4,
.header = old_flac_header
};
|
