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
99
100
101
102
103
104
105
|
/*
* Copyright (C) 2005 Matthieu CASTET
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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 "libavcodec/flac.h"
#include "avformat.h"
#include "internal.h"
#include "oggdec.h"
#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
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];
BitstreamContext bc;
int mdt;
if (os->buf[os->pstart] == 0xff)
return 0;
bitstream_init(&bc, os->buf + os->pstart, os->psize * 8);
bitstream_skip(&bc, 1); /* metadata_last */
mdt = bitstream_read(&bc, 7);
if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
uint32_t samplerate;
bitstream_skip(&bc, 4 * 8); /* "FLAC" */
if (bitstream_read(&bc, 8) != 1) /* unsupported major version */
return -1;
bitstream_skip(&bc, 8 + 16); /* minor version + header count */
bitstream_skip(&bc, 4 * 8); /* "fLaC" */
/* METADATA_BLOCK_HEADER */
if (bitstream_read(&bc, 32) != FLAC_STREAMINFO_SIZE)
return -1;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_FLAC;
st->need_parsing = AVSTREAM_PARSE_HEADERS;
st->codecpar->extradata =
av_malloc(FLAC_STREAMINFO_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
memcpy(st->codecpar->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE);
st->codecpar->extradata_size = FLAC_STREAMINFO_SIZE;
samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
if (!samplerate)
return AVERROR_INVALIDDATA;
avpriv_set_pts_info(st, 64, 1, samplerate);
} else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
ff_vorbis_stream_comment(s, st, 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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_FLAC;
return 0;
}
const struct ogg_codec ff_flac_codec = {
.magic = "\177FLAC",
.magicsize = 5,
.header = flac_header,
.nb_header = 2,
};
const struct ogg_codec ff_old_flac_codec = {
.magic = "fLaC",
.magicsize = 4,
.header = old_flac_header,
.nb_header = 0,
};
|
