blob: 61833cc8b957ce738f13d123c7cdbcb172ddcbb0
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 | |
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 | |
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 |