audio_mix: fix zeroing output channels in certain cases
[libav.git] / libavresample / resample.h
1 /*
2 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of Libav.
5 *
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.
10 *
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.
15 *
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
19 */
20
21 #ifndef AVRESAMPLE_RESAMPLE_H
22 #define AVRESAMPLE_RESAMPLE_H
23
24 #include "avresample.h"
25 #include "internal.h"
26 #include "audio_data.h"
27
28 /**
29 * Allocate and initialize a ResampleContext.
30 *
31 * The parameters in the AVAudioResampleContext are used to initialize the
32 * ResampleContext.
33 *
34 * @param avr AVAudioResampleContext
35 * @return newly-allocated ResampleContext
36 */
37 ResampleContext *ff_audio_resample_init(AVAudioResampleContext *avr);
38
39 /**
40 * Free a ResampleContext.
41 *
42 * @param c ResampleContext
43 */
44 void ff_audio_resample_free(ResampleContext **c);
45
46 /**
47 * Resample audio data.
48 *
49 * Changes the sample rate.
50 *
51 * @par
52 * All samples in the source data may not be consumed depending on the
53 * resampling parameters and the size of the output buffer. The unconsumed
54 * samples are automatically added to the start of the source in the next call.
55 * If the destination data can be reallocated, that may be done in this function
56 * in order to fit all available output. If it cannot be reallocated, fewer
57 * input samples will be consumed in order to have the output fit in the
58 * destination data buffers.
59 *
60 * @param c ResampleContext
61 * @param dst destination audio data
62 * @param src source audio data
63 * @return 0 on success, negative AVERROR code on failure
64 */
65 int ff_audio_resample(ResampleContext *c, AudioData *dst, AudioData *src);
66
67 #endif /* AVRESAMPLE_RESAMPLE_H */