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;
33  int filter_length;
35  int ideal_dst_incr;
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 */
double factor
Definition: resample.h:47
SwrFilterType
Resampling Filter Types.
Definition: swresample.h:166
#define src
Definition: vp8dsp.c:254
int filter_alloc
Definition: resample.h:34
enum AVSampleFormat format
Definition: resample.h:48
uint8_t
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
int compensation_distance
Definition: resample.h:38
enum AVResampleFilterType filter_type
Definition: resample.h:42
int filter_shift
Definition: resample.h:50
int dst_incr_mod
Definition: resample.h:38
void swri_resample_dsp_x86_init(ResampleContext *c)
Definition: resample_init.c:48
unsigned int index
Definition: resample.h:35
int dst_incr_div
Definition: resample.h:37
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
int(* resample_common)(struct ResampleContext *c, void *dst, const void *src, int n, int update_ctx)
Definition: resample.h:56
int n
Definition: avisynth_c.h:760
void swri_resample_dsp_arm_init(ResampleContext *c)
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
const AVClass * av_class
Definition: resample.h:31
int filter_length
Definition: resample.h:32
Describe the class of an AVClass context structure.
Definition: log.h:67
void swri_resample_dsp_init(ResampleContext *c)
Definition: resample_dsp.c:46
double kaiser_beta
Definition: resample.h:46
int(* resample_linear)(struct ResampleContext *c, void *dst, const void *src, int n, int update_ctx)
Definition: resample.h:58
int ideal_dst_incr
Definition: resample.h:33
int
int phase_count_compensation
Definition: resample.h:51
void(* resample_one)(struct ResampleContext *c, void *dst0, int dst_index, const void *src0, unsigned int index, int frac)
Definition: resample.h:45
uint8_t * filter_bank
Definition: resample.h:31
void swri_resample_dsp_aarch64_init(ResampleContext *c)
struct ResampleContext::@311 dsp