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14758e3211
This allows AudioMix to be treated the same way as other conversion contexts and removes the requirement to allocate it at the same time as the AVAudioResampleContext. The current matrix get/set functions are split between the public interface and AudioMix private functions.
117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/*
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* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVRESAMPLE_AUDIO_MIX_H
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#define AVRESAMPLE_AUDIO_MIX_H
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#include <stdint.h>
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#include "libavutil/samplefmt.h"
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#include "avresample.h"
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#include "audio_data.h"
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typedef void (mix_func)(uint8_t **src, void **matrix, int len, int out_ch,
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int in_ch);
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typedef struct AudioMix {
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AVAudioResampleContext *avr;
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enum AVSampleFormat fmt;
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enum AVMixCoeffType coeff_type;
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uint64_t in_layout;
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uint64_t out_layout;
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int in_channels;
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int out_channels;
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int ptr_align;
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int samples_align;
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int has_optimized_func;
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const char *func_descr;
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const char *func_descr_generic;
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mix_func *mix;
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mix_func *mix_generic;
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int16_t *matrix_q8[AVRESAMPLE_MAX_CHANNELS];
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int32_t *matrix_q15[AVRESAMPLE_MAX_CHANNELS];
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float *matrix_flt[AVRESAMPLE_MAX_CHANNELS];
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void **matrix;
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} AudioMix;
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/**
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* Set mixing function if the parameters match.
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*
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* This compares the parameters of the mixing function to the parameters in the
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* AudioMix context. If the parameters do not match, no changes are made to the
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* active functions. If the parameters do match and the alignment is not
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* constrained, the function is set as the generic mixing function. If the
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* parameters match and the alignment is constrained, the function is set as
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* the optimized mixing function.
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*
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* @param am AudioMix context
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* @param fmt input/output sample format
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* @param coeff_type mixing coefficient type
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* @param in_channels number of input channels, or 0 for any number of channels
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* @param out_channels number of output channels, or 0 for any number of channels
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* @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")
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* @param mix_func mixing function pointer
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*/
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void ff_audio_mix_set_func(AudioMix *am, enum AVSampleFormat fmt,
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enum AVMixCoeffType coeff_type, int in_channels,
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int out_channels, int ptr_align, int samples_align,
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const char *descr, void *mix_func);
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/**
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* Allocate and initialize an AudioMix context.
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*
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* The parameters in the AVAudioResampleContext are used to initialize the
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* AudioMix context.
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*
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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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/**
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* Apply channel mixing to audio data using the current mixing matrix.
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*/
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int ff_audio_mix(AudioMix *am, AudioData *src);
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/**
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* Get the current mixing matrix.
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*/
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int ff_audio_mix_get_matrix(AudioMix *am, double *matrix, int stride);
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/**
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* Set the current mixing matrix.
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*/
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int ff_audio_mix_set_matrix(AudioMix *am, const double *matrix, int stride);
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/* arch-specific initialization functions */
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void ff_audio_mix_init_x86(AudioMix *am);
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#endif /* AVRESAMPLE_AUDIO_MIX_H */
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