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
|
/*
* raw FLAC muxer
* Copyright (C) 2009 Justin Ruggles
*
* 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 "libavutil/channel_layout.h"
#include "libavcodec/flac.h"
#include "avformat.h"
#include "flacenc.h"
int ff_flac_write_header(AVIOContext *pb, uint8_t *extradata,
int extradata_size, int last_block)
{
uint8_t header[8] = {
0x66, 0x4C, 0x61, 0x43, 0x00, 0x00, 0x00, 0x22
};
header[4] = last_block ? 0x80 : 0x00;
if (extradata_size < FLAC_STREAMINFO_SIZE)
return AVERROR_INVALIDDATA;
/* write "fLaC" stream marker and first metadata block header */
avio_write(pb, header, 8);
/* write STREAMINFO */
avio_write(pb, extradata, FLAC_STREAMINFO_SIZE);
return 0;
}
int ff_flac_is_native_layout(uint64_t channel_layout)
{
if (channel_layout == AV_CH_LAYOUT_MONO ||
channel_layout == AV_CH_LAYOUT_STEREO ||
channel_layout == AV_CH_LAYOUT_SURROUND ||
channel_layout == AV_CH_LAYOUT_QUAD ||
channel_layout == AV_CH_LAYOUT_5POINT0 ||
channel_layout == AV_CH_LAYOUT_5POINT1 ||
channel_layout == AV_CH_LAYOUT_6POINT1 ||
channel_layout == AV_CH_LAYOUT_7POINT1)
return 1;
return 0;
}
|
