FFmpeg
resample_dsp.c
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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 /**
23  * @file
24  * audio resampling
25  * @author Michael Niedermayer <michaelni@gmx.at>
26  */
27 
28 #include "resample.h"
29 
30 #define TEMPLATE_RESAMPLE_S16
31 #include "resample_template.c"
32 #undef TEMPLATE_RESAMPLE_S16
33 
34 #define TEMPLATE_RESAMPLE_S32
35 #include "resample_template.c"
36 #undef TEMPLATE_RESAMPLE_S32
37 
38 #define TEMPLATE_RESAMPLE_FLT
39 #include "resample_template.c"
40 #undef TEMPLATE_RESAMPLE_FLT
41 
42 #define TEMPLATE_RESAMPLE_DBL
43 #include "resample_template.c"
44 #undef TEMPLATE_RESAMPLE_DBL
45 
47 {
48  switch(c->format){
49  case AV_SAMPLE_FMT_S16P:
50  c->dsp.resample_one = resample_one_int16;
51  c->dsp.resample_common = resample_common_int16;
52  c->dsp.resample_linear = resample_linear_int16;
53  break;
54  case AV_SAMPLE_FMT_S32P:
55  c->dsp.resample_one = resample_one_int32;
56  c->dsp.resample_common = resample_common_int32;
57  c->dsp.resample_linear = resample_linear_int32;
58  break;
59  case AV_SAMPLE_FMT_FLTP:
60  c->dsp.resample_one = resample_one_float;
61  c->dsp.resample_common = resample_common_float;
62  c->dsp.resample_linear = resample_linear_float;
63  break;
64  case AV_SAMPLE_FMT_DBLP:
65  c->dsp.resample_one = resample_one_double;
66  c->dsp.resample_common = resample_common_double;
67  c->dsp.resample_linear = resample_linear_double;
68  break;
69  }
70 
71  if (ARCH_X86) swri_resample_dsp_x86_init(c);
72  else if (ARCH_ARM) swri_resample_dsp_arm_init(c);
73  else if (ARCH_AARCH64) swri_resample_dsp_aarch64_init(c);
74 }
float, planar
Definition: samplefmt.h:69
audio resampling
double, planar
Definition: samplefmt.h:70
struct ResampleContext::@312 dsp
av_cold void swri_resample_dsp_arm_init(ResampleContext *c)
enum AVSampleFormat format
Definition: resample.h:48
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
void swri_resample_dsp_x86_init(ResampleContext *c)
Definition: resample_init.c:48
signed 32 bits, planar
Definition: samplefmt.h:68
int(* resample_common)(struct ResampleContext *c, void *dst, const void *src, int n, int update_ctx)
Definition: resample.h:56
void swri_resample_dsp_init(ResampleContext *c)
Definition: resample_dsp.c:46
int(* resample_linear)(struct ResampleContext *c, void *dst, const void *src, int n, int update_ctx)
Definition: resample.h:58
av_cold void swri_resample_dsp_aarch64_init(ResampleContext *c)
void(* resample_one)(struct ResampleContext *c, void *dst0, int dst_index, const void *src0, unsigned int index, int frac)
Definition: resample.h:45
signed 16 bits, planar
Definition: samplefmt.h:67