FFmpeg
lossless_audiodsp.c
Go to the documentation of this file.
1 /*
2  * Monkey's Audio lossless audio decoder
3  * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
4  * based upon libdemac from Dave Chapman.
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "avcodec.h"
24 #include "lossless_audiodsp.h"
25 
26 static int32_t scalarproduct_and_madd_int16_c(int16_t *v1, const int16_t *v2,
27  const int16_t *v3,
28  int order, int mul)
29 {
30  unsigned res = 0;
31 
32  do {
33  res += *v1 * *v2++;
34  *v1++ += mul * *v3++;
35  res += *v1 * *v2++;
36  *v1++ += mul * *v3++;
37  } while (order-=2);
38  return res;
39 }
40 
41 static int32_t scalarproduct_and_madd_int32_c(int16_t *v1, const int32_t *v2,
42  const int16_t *v3,
43  int order, int mul)
44 {
45  int res = 0;
46 
47  do {
48  res += *v1 * (uint32_t)*v2++;
49  *v1++ += mul * *v3++;
50  res += *v1 * (uint32_t)*v2++;
51  *v1++ += mul * *v3++;
52  } while (order-=2);
53  return res;
54 }
55 
57 {
58  c->scalarproduct_and_madd_int16 = scalarproduct_and_madd_int16_c;
59  c->scalarproduct_and_madd_int32 = scalarproduct_and_madd_int32_c;
60 
61  if (ARCH_ARM)
63  if (ARCH_PPC)
65  if (ARCH_X86)
67 }
ff_llauddsp_init
av_cold void ff_llauddsp_init(LLAudDSPContext *c)
Definition: lossless_audiodsp.c:56
av_cold
#define av_cold
Definition: attributes.h:90
scalarproduct_and_madd_int16_c
static int32_t scalarproduct_and_madd_int16_c(int16_t *v1, const int16_t *v2, const int16_t *v3, int order, int mul)
Definition: lossless_audiodsp.c:26
LLAudDSPContext
Definition: lossless_audiodsp.h:28
mul
static float mul(float src0, float src1)
Definition: dnn_backend_native_layer_mathbinary.c:40
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
ff_llauddsp_init_x86
void ff_llauddsp_init_x86(LLAudDSPContext *c)
Definition: lossless_audiodsp_init.c:38
scalarproduct_and_madd_int32_c
static int32_t scalarproduct_and_madd_int32_c(int16_t *v1, const int32_t *v2, const int16_t *v3, int order, int mul)
Definition: lossless_audiodsp.c:41
avcodec.h
lossless_audiodsp.h
int32_t
int32_t
Definition: audioconvert.c:56
ff_llauddsp_init_arm
av_cold void ff_llauddsp_init_arm(LLAudDSPContext *c)
Definition: lossless_audiodsp_init_arm.c:31
ff_llauddsp_init_ppc
void ff_llauddsp_init_ppc(LLAudDSPContext *c)
Definition: lossless_audiodsp_altivec.c:83