1 /* 2 * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #ifndef AVRESAMPLE_AUDIO_MIX_H 22 #define AVRESAMPLE_AUDIO_MIX_H 23 24 #include <stdint.h> 25 26 #include "libavutil/samplefmt.h" 27 #include "avresample.h" 28 #include "internal.h" 29 #include "audio_data.h" 30 31 typedef void (mix_func)(uint8_t **src, void **matrix, int len, int out_ch, 32 int in_ch); 33 34 /** 35 * Set mixing function if the parameters match. 36 * 37 * This compares the parameters of the mixing function to the parameters in the 38 * AudioMix context. If the parameters do not match, no changes are made to the 39 * active functions. If the parameters do match and the alignment is not 40 * constrained, the function is set as the generic mixing function. If the 41 * parameters match and the alignment is constrained, the function is set as 42 * the optimized mixing function. 43 * 44 * @param am AudioMix context 45 * @param fmt input/output sample format 46 * @param coeff_type mixing coefficient type 47 * @param in_channels number of input channels, or 0 for any number of channels 48 * @param out_channels number of output channels, or 0 for any number of channels 49 * @param ptr_align buffer pointer alignment, in bytes 50 * @param samples_align buffer size alignment, in samples 51 * @param descr function type description (e.g. "C" or "SSE") 52 * @param mix_func mixing function pointer 53 */ 54 void ff_audio_mix_set_func(AudioMix *am, enum AVSampleFormat fmt, 55 enum AVMixCoeffType coeff_type, int in_channels, 56 int out_channels, int ptr_align, int samples_align, 57 const char *descr, void *mix_func); 58 59 /** 60 * Allocate and initialize an AudioMix context. 61 * 62 * The parameters in the AVAudioResampleContext are used to initialize the 63 * AudioMix context. 64 * 65 * @param avr AVAudioResampleContext 66 * @return newly-allocated AudioMix context. 67 */ 68 AudioMix *ff_audio_mix_alloc(AVAudioResampleContext *avr); 69 70 /** 71 * Free an AudioMix context. 72 */ 73 void ff_audio_mix_free(AudioMix **am); 74 75 /** 76 * Apply channel mixing to audio data using the current mixing matrix. 77 */ 78 int ff_audio_mix(AudioMix *am, AudioData *src); 79 80 /** 81 * Get the current mixing matrix. 82 */ 83 int ff_audio_mix_get_matrix(AudioMix *am, double *matrix, int stride); 84 85 /** 86 * Set the current mixing matrix. 87 */ 88 int ff_audio_mix_set_matrix(AudioMix *am, const double *matrix, int stride); 89 90 /* arch-specific initialization functions */ 91 92 void ff_audio_mix_init_x86(AudioMix *am); 93 94 #endif /* AVRESAMPLE_AUDIO_MIX_H */ 95