audio_mix.h 3.24 KB
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/*
 * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * 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.
 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * 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
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVRESAMPLE_AUDIO_MIX_H
#define AVRESAMPLE_AUDIO_MIX_H

#include <stdint.h>

#include "libavutil/samplefmt.h"
#include "avresample.h"
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#include "internal.h"
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#include "audio_data.h"

typedef void (mix_func)(uint8_t **src, void **matrix, int len, int out_ch,
                        int in_ch);

/**
 * Set mixing function if the parameters match.
 *
 * This compares the parameters of the mixing function to the parameters in the
 * AudioMix context. If the parameters do not match, no changes are made to the
 * active functions. If the parameters do match and the alignment is not
 * constrained, the function is set as the generic mixing function. If the
 * parameters match and the alignment is constrained, the function is set as
 * the optimized mixing function.
 *
 * @param am             AudioMix context
 * @param fmt            input/output sample format
 * @param coeff_type     mixing coefficient type
 * @param in_channels    number of input channels, or 0 for any number of channels
 * @param out_channels   number of output channels, or 0 for any number of channels
 * @param ptr_align      buffer pointer alignment, in bytes
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 * @param samples_align  buffer size alignment, in samples
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 * @param descr          function type description (e.g. "C" or "SSE")
 * @param mix_func       mixing function pointer
 */
void ff_audio_mix_set_func(AudioMix *am, enum AVSampleFormat fmt,
                           enum AVMixCoeffType coeff_type, int in_channels,
                           int out_channels, int ptr_align, int samples_align,
                           const char *descr, void *mix_func);

/**
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 * Allocate and initialize an AudioMix context.
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 *
 * The parameters in the AVAudioResampleContext are used to initialize the
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 * AudioMix context.
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 *
 * @param avr  AVAudioResampleContext
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 * @return     newly-allocated AudioMix context.
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 */
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AudioMix *ff_audio_mix_alloc(AVAudioResampleContext *avr);
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/**
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 * Free an AudioMix context.
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 */
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void ff_audio_mix_free(AudioMix **am);
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/**
 * Apply channel mixing to audio data using the current mixing matrix.
 */
int ff_audio_mix(AudioMix *am, AudioData *src);

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/**
 * Get the current mixing matrix.
 */
int ff_audio_mix_get_matrix(AudioMix *am, double *matrix, int stride);

/**
 * Set the current mixing matrix.
 */
int ff_audio_mix_set_matrix(AudioMix *am, const double *matrix, int stride);

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/* arch-specific initialization functions */

void ff_audio_mix_init_x86(AudioMix *am);

#endif /* AVRESAMPLE_AUDIO_MIX_H */