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 27typedef 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 38extern const int ff_mpeg4audio_sample_rates[16]; 39extern 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 */ 47int ff_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int buf_size); 48 49#endif /* AVCODEC_MPEG4AUDIO_H */ 50