yading@10: /*
yading@10:  * audio conversion
yading@10:  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
yading@10:  * Copyright (c) 2008 Peter Ross
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_AUDIOCONVERT_H
yading@10: #define AVCODEC_AUDIOCONVERT_H
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Audio format conversion routines
yading@10:  */
yading@10: 
yading@10: 
yading@10: #include "libavutil/cpu.h"
yading@10: #include "avcodec.h"
yading@10: #include "libavutil/channel_layout.h"
yading@10: 
yading@10: struct AVAudioConvert;
yading@10: typedef struct AVAudioConvert AVAudioConvert;
yading@10: 
yading@10: /**
yading@10:  * Create an audio sample format converter context
yading@10:  * @param out_fmt Output sample format
yading@10:  * @param out_channels Number of output channels
yading@10:  * @param in_fmt Input sample format
yading@10:  * @param in_channels Number of input channels
yading@10:  * @param[in] matrix Channel mixing matrix (of dimension in_channel*out_channels). Set to NULL to ignore.
yading@10:  * @param flags See AV_CPU_FLAG_xx
yading@10:  * @return NULL on error
yading@10:  */
yading@10: AVAudioConvert *av_audio_convert_alloc(enum AVSampleFormat out_fmt, int out_channels,
yading@10:                                        enum AVSampleFormat in_fmt, int in_channels,
yading@10:                                        const float *matrix, int flags);
yading@10: 
yading@10: /**
yading@10:  * Free audio sample format converter context
yading@10:  */
yading@10: void av_audio_convert_free(AVAudioConvert *ctx);
yading@10: 
yading@10: /**
yading@10:  * Convert between audio sample formats
yading@10:  * @param[in] out array of output buffers for each channel. set to NULL to ignore processing of the given channel.
yading@10:  * @param[in] out_stride distance between consecutive output samples (measured in bytes)
yading@10:  * @param[in] in array of input buffers for each channel
yading@10:  * @param[in] in_stride distance between consecutive input samples (measured in bytes)
yading@10:  * @param len length of audio frame size (measured in samples)
yading@10:  */
yading@10: int av_audio_convert(AVAudioConvert *ctx,
yading@10:                            void * const out[6], const int out_stride[6],
yading@10:                      const void * const  in[6], const int  in_stride[6], int len);
yading@10: 
yading@10: #endif /* AVCODEC_AUDIOCONVERT_H */