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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 "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.