/* * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com> * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * 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. * * Libav is distributed in the hope that it will be useful, * 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 * License along with Libav; if not, write to the Free Software * 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" #include "internal.h" #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 * @param samples_align buffer size alignment, in samples * @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); /** * Allocate and initialize an AudioMix context. * * The parameters in the AVAudioResampleContext are used to initialize the * AudioMix context. * * @param avr AVAudioResampleContext * @return newly-allocated AudioMix context. */ AudioMix *ff_audio_mix_alloc(AVAudioResampleContext *avr); /** * Free an AudioMix context. */ void ff_audio_mix_free(AudioMix **am); /** * Apply channel mixing to audio data using the current mixing matrix. */ int ff_audio_mix(AudioMix *am, AudioData *src); /** * 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); /* arch-specific initialization functions */ void ff_audio_mix_init_x86(AudioMix *am); #endif /* AVRESAMPLE_AUDIO_MIX_H */