2 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
21 #ifndef AVRESAMPLE_RESAMPLE_H
22 #define AVRESAMPLE_RESAMPLE_H
24 #include "avresample.h"
26 #include "audio_data.h"
28 struct ResampleContext
{
29 AVAudioResampleContext
*avr
;
38 int compensation_distance
;
42 enum AVResampleFilterType filter_type
;
44 void (*set_filter
)(void *filter
, double *tab
, int phase
, int tap_count
);
45 void (*resample_one
)(struct ResampleContext
*c
, void *dst0
,
46 int dst_index
, const void *src0
,
47 unsigned int index
, int frac
);
48 void (*resample_nearest
)(void *dst0
, int dst_index
,
49 const void *src0
, unsigned int index
);
51 int initial_padding_filled
;
52 int initial_padding_samples
;
53 int final_padding_filled
;
54 int final_padding_samples
;
58 * Allocate and initialize a ResampleContext.
60 * The parameters in the AVAudioResampleContext are used to initialize the
63 * @param avr AVAudioResampleContext
64 * @return newly-allocated ResampleContext
66 ResampleContext
*ff_audio_resample_init(AVAudioResampleContext
*avr
);
69 * Free a ResampleContext.
71 * @param c ResampleContext
73 void ff_audio_resample_free(ResampleContext
**c
);
76 * Resample audio data.
78 * Changes the sample rate.
81 * All samples in the source data may not be consumed depending on the
82 * resampling parameters and the size of the output buffer. The unconsumed
83 * samples are automatically added to the start of the source in the next call.
84 * If the destination data can be reallocated, that may be done in this function
85 * in order to fit all available output. If it cannot be reallocated, fewer
86 * input samples will be consumed in order to have the output fit in the
87 * destination data buffers.
89 * @param c ResampleContext
90 * @param dst destination audio data
91 * @param src source audio data
92 * @return 0 on success, negative AVERROR code on failure
94 int ff_audio_resample(ResampleContext
*c
, AudioData
*dst
, AudioData
*src
);
96 #endif /* AVRESAMPLE_RESAMPLE_H */