Libav
float_dsp.c
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1 /*
2  * This file is part of Libav.
3  *
4  * Libav is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * Libav is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with Libav; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 #include "attributes.h"
21 #include "float_dsp.h"
22 
23 static void vector_fmul_c(float *dst, const float *src0, const float *src1,
24  int len)
25 {
26  int i;
27  for (i = 0; i < len; i++)
28  dst[i] = src0[i] * src1[i];
29 }
30 
31 static void vector_fmac_scalar_c(float *dst, const float *src, float mul,
32  int len)
33 {
34  int i;
35  for (i = 0; i < len; i++)
36  dst[i] += src[i] * mul;
37 }
38 
39 static void vector_fmul_scalar_c(float *dst, const float *src, float mul,
40  int len)
41 {
42  int i;
43  for (i = 0; i < len; i++)
44  dst[i] = src[i] * mul;
45 }
46 
47 static void vector_dmul_scalar_c(double *dst, const double *src, double mul,
48  int len)
49 {
50  int i;
51  for (i = 0; i < len; i++)
52  dst[i] = src[i] * mul;
53 }
54 
55 static void vector_fmul_window_c(float *dst, const float *src0,
56  const float *src1, const float *win, int len)
57 {
58  int i, j;
59 
60  dst += len;
61  win += len;
62  src0 += len;
63 
64  for (i = -len, j = len - 1; i < 0; i++, j--) {
65  float s0 = src0[i];
66  float s1 = src1[j];
67  float wi = win[i];
68  float wj = win[j];
69  dst[i] = s0 * wj - s1 * wi;
70  dst[j] = s0 * wi + s1 * wj;
71  }
72 }
73 
74 static void vector_fmul_add_c(float *dst, const float *src0, const float *src1,
75  const float *src2, int len){
76  int i;
77 
78  for (i = 0; i < len; i++)
79  dst[i] = src0[i] * src1[i] + src2[i];
80 }
81 
82 static void vector_fmul_reverse_c(float *dst, const float *src0,
83  const float *src1, int len)
84 {
85  int i;
86 
87  src1 += len-1;
88  for (i = 0; i < len; i++)
89  dst[i] = src0[i] * src1[-i];
90 }
91 
92 static void butterflies_float_c(float *restrict v1, float *restrict v2,
93  int len)
94 {
95  int i;
96 
97  for (i = 0; i < len; i++) {
98  float t = v1[i] - v2[i];
99  v1[i] += v2[i];
100  v2[i] = t;
101  }
102 }
103 
104 float avpriv_scalarproduct_float_c(const float *v1, const float *v2, int len)
105 {
106  float p = 0.0;
107  int i;
108 
109  for (i = 0; i < len; i++)
110  p += v1[i] * v2[i];
111 
112  return p;
113 }
114 
116 {
117  fdsp->vector_fmul = vector_fmul_c;
126 
127 #if ARCH_ARM
128  ff_float_dsp_init_arm(fdsp);
129 #elif ARCH_PPC
130  ff_float_dsp_init_ppc(fdsp, bit_exact);
131 #elif ARCH_X86
132  ff_float_dsp_init_x86(fdsp);
133 #endif
134 }