libavcodec/mpeg4audio.h

   1 /*
   2  * MPEG-4 Audio common header
   3  * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
   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 #ifndef AVCODEC_MPEG4AUDIO_H
  23 #define AVCODEC_MPEG4AUDIO_H
  24
  25 #include <stdint.h>
  26
  27 typedef struct {
  28     int object_type;
  29     int sampling_index;
  30     int sample_rate;
  31     int chan_config;
  32     int sbr; //< -1 implicit, 1 presence
  33     int ext_object_type;
  34     int ext_sampling_index;
  35     int ext_sample_rate;
  36 } MPEG4AudioConfig;
  37
  38 extern const int ff_mpeg4audio_sample_rates[16];
  39 extern const uint8_t ff_mpeg4audio_channels[8];
  40 /**
  41  * Parse MPEG-4 systems extradata to retrieve audio configuration.
  42  * @param[in] c        MPEG4AudioConfig structure to fill.
  43  * @param[in] buf      Extradata from container.
  44  * @param[in] buf_size Extradata size.
  45  * @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
  46  */
  47 int ff_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int buf_size);
  48
  49 #endif /* AVCODEC_MPEG4AUDIO_H */