1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/*
* Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
*
* This file is part of libswresample
*
* libswresample 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.
*
* libswresample 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 libswresample; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SWR_H
#define SWR_H
#include <inttypes.h>
#include "libavutil/samplefmt.h"
#define LIBSWRESAMPLE_VERSION_MAJOR 0
#define LIBSWRESAMPLE_VERSION_MINOR 2
#define LIBSWRESAMPLE_VERSION_MICRO 0
#define SWR_CH_MAX 16
#define SWR_FLAG_RESAMPLE 1///< Force resampling even if equal sample rate
//TODO use int resample ?
//long term TODO can we enable this dynamically?
struct SwrContext;
/**
* Allocate SwrContext.
* @see swr_init(),swr_free()
* @return NULL on error
*/
struct SwrContext *swr_alloc(void);
/**
* Initialize context after user parameters have been set.
* @return negativo n error
*/
int swr_init(struct SwrContext *s);
/**
* Allocate SwrContext.
* @see swr_init(),swr_free()
* @return NULL on error
*/
struct SwrContext *swr_alloc2(struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate,
const int *channel_map, int log_offset, void *log_ctx);
/**
* Free the given SwrContext.
* And set the pointer to NULL
*/
void swr_free(struct SwrContext **s);
/**
* Convert audio.
*
* in & in_count can be set to 0 to flush the last few samples out at the end.
* @param in_count Number of input samples available in one channel.
* @param out_count Amount of space available for output in samples per channel.
* @return number of samples output per channel
*/
int swr_convert(struct SwrContext *s, uint8_t *out[SWR_CH_MAX], int out_count,
const uint8_t *in [SWR_CH_MAX], int in_count);
void swr_compensate(struct SwrContext *s, int sample_delta, int compensation_distance);
#endif
|
