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2ba45a60 DM |
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 | } |