FFmpeg
flacenc_header.c
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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 
23 
24 #include "libavcodec/flac.h"
25 
26 #include "avformat.h"
27 #include "flacenc.h"
28 
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 }
#define AV_CH_LAYOUT_7POINT1
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AV_CH_LAYOUT_6POINT1
#define AV_CH_LAYOUT_SURROUND
#define AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_5POINT0
uint8_t
int ff_flac_write_header(AVIOContext *pb, uint8_t *extradata, int extradata_size, int last_block)
static const uint8_t header[24]
Definition: sdr2.c:67
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
#define AV_CH_LAYOUT_5POINT1
FLAC (Free Lossless Audio Codec) decoder/demuxer common functions.
#define AV_CH_LAYOUT_QUAD
int ff_flac_is_native_layout(uint64_t channel_layout)
audio channel layout utility functions
#define FLAC_STREAMINFO_SIZE
Definition: flac.h:34
Main libavformat public API header.
#define AV_CH_LAYOUT_MONO