text: /* Copyright (C)2012 Xiph.Org Foundation
     File: opus_header.h
  
     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions
     are met:
  
     - Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  
     - Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
  
     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
  
  #ifndef OPUS_HEADER_H
  #define OPUS_HEADER_H
  
  #include "ogg.h"
  
  typedef struct {
     int version;
     int channels; /* Number of channels: 1..255 */
     int preskip;
     ogg_uint32_t input_sample_rate;
     int gain; /* in dB S7.8 should be zero whenever possible */
     int channel_mapping;
     /* The rest is only used if channel_mapping != 0 */
     int nb_streams;
     int nb_coupled;
     unsigned char stream_map[255];
  } OpusHeader;
  
  int opus_header_parse(const unsigned char *packet, int len, OpusHeader *h);
  int opus_header_to_packet(const OpusHeader *h, unsigned char *packet, int len);
  
  extern const int wav_permute_matrix[8][8];
  
  #endif
  