FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
float_dsp.c
Go to the documentation of this file.
1 /*
2  * Copyright 2005 Balatoni Denes
3  * Copyright 2006 Loren Merritt
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 #include "config.h"
23 #include "attributes.h"
24 #include "float_dsp.h"
25 
26 static void vector_fmul_c(float *dst, const float *src0, const float *src1,
27  int len)
28 {
29  int i;
30  for (i = 0; i < len; i++)
31  dst[i] = src0[i] * src1[i];
32 }
33 
34 static void vector_fmac_scalar_c(float *dst, const float *src, float mul,
35  int len)
36 {
37  int i;
38  for (i = 0; i < len; i++)
39  dst[i] += src[i] * mul;
40 }
41 
42 static void vector_fmul_scalar_c(float *dst, const float *src, float mul,
43  int len)
44 {
45  int i;
46  for (i = 0; i < len; i++)
47  dst[i] = src[i] * mul;
48 }
49 
50 static void vector_dmul_scalar_c(double *dst, const double *src, double mul,
51  int len)
52 {
53  int i;
54  for (i = 0; i < len; i++)
55  dst[i] = src[i] * mul;
56 }
57 
58 static void vector_fmul_window_c(float *dst, const float *src0,
59  const float *src1, const float *win, int len)
60 {
61  int i, j;
62 
63  dst += len;
64  win += len;
65  src0 += len;
66 
67  for (i = -len, j = len - 1; i < 0; i++, j--) {
68  float s0 = src0[i];
69  float s1 = src1[j];
70  float wi = win[i];
71  float wj = win[j];
72  dst[i] = s0 * wj - s1 * wi;
73  dst[j] = s0 * wi + s1 * wj;
74  }
75 }
76 
77 static void vector_fmul_add_c(float *dst, const float *src0, const float *src1,
78  const float *src2, int len){
79  int i;
80 
81  for (i = 0; i < len; i++)
82  dst[i] = src0[i] * src1[i] + src2[i];
83 }
84 
85 static void vector_fmul_reverse_c(float *dst, const float *src0,
86  const float *src1, int len)
87 {
88  int i;
89 
90  src1 += len-1;
91  for (i = 0; i < len; i++)
92  dst[i] = src0[i] * src1[-i];
93 }
94 
95 static void butterflies_float_c(float *av_restrict v1, float *av_restrict v2,
96  int len)
97 {
98  int i;
99 
100  for (i = 0; i < len; i++) {
101  float t = v1[i] - v2[i];
102  v1[i] += v2[i];
103  v2[i] = t;
104  }
105 }
106 
107 float avpriv_scalarproduct_float_c(const float *v1, const float *v2, int len)
108 {
109  float p = 0.0;
110  int i;
111 
112  for (i = 0; i < len; i++)
113  p += v1[i] * v2[i];
114 
115  return p;
116 }
117 
119 {
120  fdsp->vector_fmul = vector_fmul_c;
129 
130 #if ARCH_ARM
131  ff_float_dsp_init_arm(fdsp);
132 #elif ARCH_PPC
133  ff_float_dsp_init_ppc(fdsp, bit_exact);
134 #elif ARCH_X86
135  ff_float_dsp_init_x86(fdsp);
136 #elif ARCH_MIPS
138 #endif
139 }