1 /*
2 * raw FLAC muxer
3 * Copyright (C) 2009 Justin Ruggles
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/channel_layout.h"
23
24 #include "libavcodec/flac.h"
25
26 #include "avformat.h"
27 #include "flacenc.h"
28
ff_flac_write_header(AVIOContext * pb,uint8_t * extradata,int extradata_size,int last_block)29 int ff_flac_write_header(AVIOContext *pb, uint8_t *extradata,
30 int extradata_size, int last_block)
31 {
32 uint8_t header[8] = {
33 0x66, 0x4C, 0x61, 0x43, 0x00, 0x00, 0x00, 0x22
34 };
35
36 header[4] = last_block ? 0x80 : 0x00;
37
38 if (extradata_size < FLAC_STREAMINFO_SIZE)
39 return AVERROR_INVALIDDATA;
40
41 /* write "fLaC" stream marker and first metadata block header */
42 avio_write(pb, header, 8);
43
44 /* write STREAMINFO */
45 avio_write(pb, extradata, FLAC_STREAMINFO_SIZE);
46
47 return 0;
48 }
49
ff_flac_is_native_layout(uint64_t channel_layout)50 int ff_flac_is_native_layout(uint64_t channel_layout)
51 {
52 if (channel_layout == AV_CH_LAYOUT_MONO ||
53 channel_layout == AV_CH_LAYOUT_STEREO ||
54 channel_layout == AV_CH_LAYOUT_SURROUND ||
55 channel_layout == AV_CH_LAYOUT_QUAD ||
56 channel_layout == AV_CH_LAYOUT_5POINT0 ||
57 channel_layout == AV_CH_LAYOUT_5POINT1 ||
58 channel_layout == AV_CH_LAYOUT_6POINT1 ||
59 channel_layout == AV_CH_LAYOUT_7POINT1)
60 return 1;
61 return 0;
62 }
63