FFmpeg
resample.h
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1 /*
2  * audio resampling
3  * Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #ifndef SWRESAMPLE_RESAMPLE_H
23 #define SWRESAMPLE_RESAMPLE_H
24 
25 #include "libavutil/log.h"
26 #include "libavutil/samplefmt.h"
27 
28 #include "swresample_internal.h"
29 
30 typedef struct ResampleContext {
31  const AVClass *av_class;
32  uint8_t *filter_bank;
36  int dst_incr;
39  int index;
40  int frac;
41  int src_incr;
44  int linear;
46  double kaiser_beta;
47  double factor;
51  int phase_count_compensation; /* desired phase_count when compensation is enabled */
52 
53  struct {
54  void (*resample_one)(void *dst, const void *src,
55  int n, int64_t index, int64_t incr);
56  int (*resample_common)(struct ResampleContext *c, void *dst,
57  const void *src, int n, int update_ctx);
58  int (*resample_linear)(struct ResampleContext *c, void *dst,
59  const void *src, int n, int update_ctx);
60  } dsp;
62 
67 
68 #endif /* SWRESAMPLE_RESAMPLE_H */
ResampleContext::resample_one
void(* resample_one)(void *dst, const void *src, int n, int64_t index, int64_t incr)
Definition: resample.h:54
swri_resample_dsp_aarch64_init
void swri_resample_dsp_aarch64_init(ResampleContext *c)
Definition: resample_init.c:106
ResampleContext::frac
int frac
Definition: resample.h:40
ResampleContext::filter_shift
int filter_shift
Definition: resample.h:50
ResampleContext::av_class
const AVClass * av_class
Definition: resample.h:31
ResampleContext::resample_common
int(* resample_common)(struct ResampleContext *c, void *dst, const void *src, int n, int update_ctx)
Definition: resample.h:56
ResampleContext::dst_incr
int dst_incr
Definition: resample.h:36
ResampleContext::kaiser_beta
double kaiser_beta
Definition: resample.h:46
ResampleContext::resample_linear
int(* resample_linear)(struct ResampleContext *c, void *dst, const void *src, int n, int update_ctx)
Definition: resample.h:58
swri_resample_dsp_x86_init
void swri_resample_dsp_x86_init(ResampleContext *c)
Definition: resample_init.c:49
ResampleContext::filter_length
int filter_length
Definition: resample.h:33
samplefmt.h
ResampleContext::phase_count
int phase_count
Definition: resample.h:43
ResampleContext::ideal_dst_incr
int ideal_dst_incr
Definition: resample.h:35
ResampleContext
Definition: resample.h:30
ResampleContext::filter_type
enum SwrFilterType filter_type
Definition: resample.h:45
swri_resample_dsp_arm_init
void swri_resample_dsp_arm_init(ResampleContext *c)
Definition: resample_init.c:106
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
SwrFilterType
SwrFilterType
Resampling Filter Types.
Definition: swresample.h:166
src
#define src
Definition: vp8dsp.c:255
ResampleContext::format
enum AVSampleFormat format
Definition: resample.h:48
ResampleContext::filter_alloc
int filter_alloc
Definition: resample.h:34
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
ResampleContext::linear
int linear
Definition: resample.h:44
ResampleContext::felem_size
int felem_size
Definition: resample.h:49
swresample_internal.h
ResampleContext::filter_bank
uint8_t * filter_bank
Definition: resample.h:32
log.h
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
ResampleContext::dst_incr_mod
int dst_incr_mod
Definition: resample.h:38
ResampleContext::dsp
struct ResampleContext::@316 dsp
ResampleContext::factor
double factor
Definition: resample.h:47
ResampleContext::compensation_distance
int compensation_distance
Definition: resample.h:42
swri_resample_dsp_init
void swri_resample_dsp_init(ResampleContext *c)
Definition: resample_dsp.c:46
ResampleContext::src_incr
int src_incr
Definition: resample.h:41
ResampleContext::phase_count_compensation
int phase_count_compensation
Definition: resample.h:51
int
int
Definition: ffmpeg_filter.c:156
ResampleContext::dst_incr_div
int dst_incr_div
Definition: resample.h:37
ResampleContext::index
int index
Definition: resample.h:39