yading@11: /*
yading@11:  * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
yading@11:  *
yading@11:  * This file is part of Libav.
yading@11:  *
yading@11:  * Libav is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * Libav is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with Libav; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #ifndef AVRESAMPLE_AUDIO_MIX_H
yading@11: #define AVRESAMPLE_AUDIO_MIX_H
yading@11: 
yading@11: #include <stdint.h>
yading@11: 
yading@11: #include "libavutil/samplefmt.h"
yading@11: #include "avresample.h"
yading@11: #include "internal.h"
yading@11: #include "audio_data.h"
yading@11: 
yading@11: typedef void (mix_func)(uint8_t **src, void **matrix, int len, int out_ch,
yading@11:                         int in_ch);
yading@11: 
yading@11: /**
yading@11:  * Set mixing function if the parameters match.
yading@11:  *
yading@11:  * This compares the parameters of the mixing function to the parameters in the
yading@11:  * AudioMix context. If the parameters do not match, no changes are made to the
yading@11:  * active functions. If the parameters do match and the alignment is not
yading@11:  * constrained, the function is set as the generic mixing function. If the
yading@11:  * parameters match and the alignment is constrained, the function is set as
yading@11:  * the optimized mixing function.
yading@11:  *
yading@11:  * @param am             AudioMix context
yading@11:  * @param fmt            input/output sample format
yading@11:  * @param coeff_type     mixing coefficient type
yading@11:  * @param in_channels    number of input channels, or 0 for any number of channels
yading@11:  * @param out_channels   number of output channels, or 0 for any number of channels
yading@11:  * @param ptr_align      buffer pointer alignment, in bytes
yading@11:  * @param samples_align  buffer size alignment, in samples
yading@11:  * @param descr          function type description (e.g. "C" or "SSE")
yading@11:  * @param mix_func       mixing function pointer
yading@11:  */
yading@11: void ff_audio_mix_set_func(AudioMix *am, enum AVSampleFormat fmt,
yading@11:                            enum AVMixCoeffType coeff_type, int in_channels,
yading@11:                            int out_channels, int ptr_align, int samples_align,
yading@11:                            const char *descr, void *mix_func);
yading@11: 
yading@11: /**
yading@11:  * Allocate and initialize an AudioMix context.
yading@11:  *
yading@11:  * The parameters in the AVAudioResampleContext are used to initialize the
yading@11:  * AudioMix context.
yading@11:  *
yading@11:  * @param avr  AVAudioResampleContext
yading@11:  * @return     newly-allocated AudioMix context.
yading@11:  */
yading@11: AudioMix *ff_audio_mix_alloc(AVAudioResampleContext *avr);
yading@11: 
yading@11: /**
yading@11:  * Free an AudioMix context.
yading@11:  */
yading@11: void ff_audio_mix_free(AudioMix **am);
yading@11: 
yading@11: /**
yading@11:  * Apply channel mixing to audio data using the current mixing matrix.
yading@11:  */
yading@11: int ff_audio_mix(AudioMix *am, AudioData *src);
yading@11: 
yading@11: /**
yading@11:  * Get the current mixing matrix.
yading@11:  */
yading@11: int ff_audio_mix_get_matrix(AudioMix *am, double *matrix, int stride);
yading@11: 
yading@11: /**
yading@11:  * Set the current mixing matrix.
yading@11:  */
yading@11: int ff_audio_mix_set_matrix(AudioMix *am, const double *matrix, int stride);
yading@11: 
yading@11: /* arch-specific initialization functions */
yading@11: 
yading@11: void ff_audio_mix_init_x86(AudioMix *am);
yading@11: 
yading@11: #endif /* AVRESAMPLE_AUDIO_MIX_H */