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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 
22 #include "libavcodec/flac.h"
23 #include "libavcodec/bytestream.h"
24 #include "avformat.h"
25 #include "flacenc.h"
26 
28  int last_block)
29 {
30  uint8_t header[8] = {
31  0x66, 0x4C, 0x61, 0x43, 0x00, 0x00, 0x00, 0x22
32  };
33  uint8_t *streaminfo;
34  enum FLACExtradataFormat format;
35 
36  header[4] = last_block ? 0x80 : 0x00;
37  if (!avpriv_flac_is_extradata_valid(codec, &format, &streaminfo))
38  return -1;
39 
40  /* write "fLaC" stream marker and first metadata block header */
41  avio_write(pb, header, 8);
42 
43  /* write STREAMINFO */
44  avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
45 
46  return 0;
47 }