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c8af852b97
This is a new library for audio sample format, channel layout, and sample rate conversion.
109 lines
3.7 KiB
C
109 lines
3.7 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_q6[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 sample_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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* Initialize the AudioMix context in the AVAudioResampleContext.
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*
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* The parameters in the AVAudioResampleContext are used to initialize the
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* AudioMix context and set the mixing matrix.
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*
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* @param avr AVAudioResampleContext
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* @return 0 on success, negative AVERROR code on failure
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*/
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int ff_audio_mix_init(AVAudioResampleContext *avr);
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/**
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* Close an AudioMix context.
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*
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* This clears and frees the mixing matrix arrays.
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*/
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void ff_audio_mix_close(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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/* 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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