2 * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
4 * This file is part of Libav.
6 * Libav 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.
11 * Libav 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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVRESAMPLE_AUDIO_MIX_H
22 #define AVRESAMPLE_AUDIO_MIX_H
26 #include "libavutil/samplefmt.h"
27 #include "avresample.h"
28 #include "audio_data.h"
30 typedef void (mix_func)(uint8_t **src, void **matrix, int len, int out_ch,
33 typedef struct AudioMix AudioMix;
36 * Set mixing function if the parameters match.
38 * This compares the parameters of the mixing function to the parameters in the
39 * AudioMix context. If the parameters do not match, no changes are made to the
40 * active functions. If the parameters do match and the alignment is not
41 * constrained, the function is set as the generic mixing function. If the
42 * parameters match and the alignment is constrained, the function is set as
43 * the optimized mixing function.
45 * @param am AudioMix context
46 * @param fmt input/output sample format
47 * @param coeff_type mixing coefficient type
48 * @param in_channels number of input channels, or 0 for any number of channels
49 * @param out_channels number of output channels, or 0 for any number of channels
50 * @param ptr_align buffer pointer alignment, in bytes
51 * @param samples_align buffer size alignment, in samples
52 * @param descr function type description (e.g. "C" or "SSE")
53 * @param mix_func mixing function pointer
55 void ff_audio_mix_set_func(AudioMix *am, enum AVSampleFormat fmt,
56 enum AVMixCoeffType coeff_type, int in_channels,
57 int out_channels, int ptr_align, int samples_align,
58 const char *descr, void *mix_func);
61 * Allocate and initialize an AudioMix context.
63 * The parameters in the AVAudioResampleContext are used to initialize the
66 * @param avr AVAudioResampleContext
67 * @return newly-allocated AudioMix context.
69 AudioMix *ff_audio_mix_alloc(AVAudioResampleContext *avr);
72 * Free an AudioMix context.
74 void ff_audio_mix_free(AudioMix **am);
77 * Apply channel mixing to audio data using the current mixing matrix.
79 int ff_audio_mix(AudioMix *am, AudioData *src);
82 * Get the current mixing matrix.
84 int ff_audio_mix_get_matrix(AudioMix *am, double *matrix, int stride);
87 * Set the current mixing matrix.
89 int ff_audio_mix_set_matrix(AudioMix *am, const double *matrix, int stride);
91 /* arch-specific initialization functions */
93 void ff_audio_mix_init_x86(AudioMix *am);
95 #endif /* AVRESAMPLE_AUDIO_MIX_H */