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mpeg4audio common code

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Originally committed as revision 12662 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2008-04-01 12:01:40 +00:00
parent ce53144bac
commit 4d34bb19c1
2 changed files with 132 additions and 0 deletions
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libavcodec/mpeg4audio.h Normal file
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/*
* MPEG-4 Audio common header
* Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef FFMPEG_MPEG4AUDIO_H
#define FFMPEG_MPEG4AUDIO_H
#include <stdint.h>
typedef struct {
int object_type;
int sampling_index;
int sample_rate;
int chan_config;
int sbr; //< -1 implicit, 1 presence
int ext_object_type;
int ext_sampling_index;
int ext_sample_rate;
} MPEG4AudioConfig;
extern const int ff_mpeg4audio_sample_rates[16];
extern const uint8_t ff_mpeg4audio_channels[8];
/**
* Parse MPEG-4 systems extradata to retrieve audio configuration.
* @param[in] c MPEG4AudioConfig structure to fill.
* @param[in] buf Extradata from container.
* @param[in] buf_size Extradata size.
* @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
*/
int ff_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int buf_size);
#endif /* FFMPEG_MPEGAUDIO_H */