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  1. /*
  2.  * Copyright (c) 2011 Justin Ruggles
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. /**
  22.  * mov 'chan' tag reading/writing.
  23.  * @author Justin Ruggles
  24.  */
  25.  
  26. #ifndef AVFORMAT_MOV_CHAN_H
  27. #define AVFORMAT_MOV_CHAN_H
  28.  
  29. #include <stdint.h>
  30.  
  31. #include "libavcodec/avcodec.h"
  32. #include "avformat.h"
  33.  
  34. /**
  35.  * Get the channel layout for the specified channel layout tag.
  36.  *
  37.  * @param[in]  tag     channel layout tag
  38.  * @param[out] bitmap  channel bitmap (only used if needed)
  39.  * @return             channel layout
  40.  */
  41. uint64_t ff_mov_get_channel_layout(uint32_t tag, uint32_t bitmap);
  42.  
  43. /**
  44.  * Get the channel layout tag for the specified codec id and channel layout.
  45.  * If the layout tag was not found, use a channel bitmap if possible.
  46.  *
  47.  * @param[in]  codec_id        codec id
  48.  * @param[in]  channel_layout  channel layout
  49.  * @param[out] bitmap          channel bitmap
  50.  * @return                     channel layout tag
  51.  */
  52. uint32_t ff_mov_get_channel_layout_tag(enum AVCodecID codec_id,
  53.                                        uint64_t channel_layout,
  54.                                        uint32_t *bitmap);
  55.  
  56. /**
  57.  * Read 'chan' tag from the input stream.
  58.  *
  59.  * @param s     AVFormatContext
  60.  * @param pb    AVIOContext
  61.  * @param st    The stream to set codec values for
  62.  * @param size  Remaining size in the 'chan' tag
  63.  * @return      0 if ok, or negative AVERROR code on failure
  64.  */
  65. int ff_mov_read_chan(AVFormatContext *s, AVIOContext *pb, AVStream *st,
  66.                      int64_t size);
  67.  
  68. #endif /* AVFORMAT_MOV_CHAN_H */
  69.