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path: root/libavutil/fixed_dsp.c (plain)
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1/*
2 * Copyright (c) 2012
3 * MIPS Technologies, Inc., California.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Author: Nedeljko Babic (nedeljko.babic imgtec com)
30 *
31 * This file is part of FFmpeg.
32 *
33 * FFmpeg is free software; you can redistribute it and/or
34 * modify it under the terms of the GNU Lesser General Public
35 * License as published by the Free Software Foundation; either
36 * version 2.1 of the License, or (at your option) any later version.
37 *
38 * FFmpeg is distributed in the hope that it will be useful,
39 * but WITHOUT ANY WARRANTY; without even the implied warranty of
40 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41 * Lesser General Public License for more details.
42 *
43 * You should have received a copy of the GNU Lesser General Public
44 * License along with FFmpeg; if not, write to the Free Software
45 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
46 */
47
48#include "fixed_dsp.h"
49
50static void vector_fmul_add_c(int *dst, const int *src0, const int *src1, const int *src2, int len){
51 int i;
52 int64_t accu;
53
54 for (i=0; i<len; i++) {
55 accu = (int64_t)src0[i] * src1[i];
56 dst[i] = src2[i] + (int)((accu + 0x40000000) >> 31);
57 }
58}
59
60static void vector_fmul_reverse_c(int *dst, const int *src0, const int *src1, int len)
61{
62 int i;
63 int64_t accu;
64
65 src1 += len-1;
66 for (i=0; i<len; i++) {
67 accu = (int64_t)src0[i] * src1[-i];
68 dst[i] = (int)((accu+0x40000000) >> 31);
69 }
70}
71
72static void vector_fmul_window_scaled_c(int16_t *dst, const int32_t *src0,
73 const int32_t *src1, const int32_t *win,
74 int len, uint8_t bits)
75{
76 int32_t s0, s1, wi, wj, i,j, round;
77
78 dst += len;
79 win += len;
80 src0+= len;
81 round = bits? 1 << (bits-1) : 0;
82
83 for (i=-len, j=len-1; i<0; i++, j--) {
84 s0 = src0[i];
85 s1 = src1[j];
86 wi = win[i];
87 wj = win[j];
88 dst[i] = av_clip_int16(((((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31) + round) >> bits);
89 dst[j] = av_clip_int16(((((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31) + round) >> bits);
90 }
91}
92
93static void vector_fmul_window_c(int32_t *dst, const int32_t *src0,
94 const int32_t *src1, const int32_t *win,
95 int len)
96{
97 int32_t s0, s1, wi, wj, i, j;
98
99 dst += len;
100 win += len;
101 src0+= len;
102
103 for (i=-len, j=len-1; i<0; i++, j--) {
104 s0 = src0[i];
105 s1 = src1[j];
106 wi = win[i];
107 wj = win[j];
108 dst[i] = ((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31;
109 dst[j] = ((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31;
110 }
111}
112
113static void vector_fmul_c(int *dst, const int *src0, const int *src1, int len)
114{
115 int i;
116 int64_t accu;
117
118 for (i = 0; i < len; i++){
119 accu = (int64_t)src0[i] * src1[i];
120 dst[i] = (int)((accu+0x40000000) >> 31);
121 }
122}
123
124static int scalarproduct_fixed_c(const int *v1, const int *v2, int len)
125{
126 /** p is initialized with 0x40000000 so that the proper rounding will occur
127 * at the end */
128 int64_t p = 0x40000000;
129 int i;
130
131 for (i = 0; i < len; i++)
132 p += (int64_t)v1[i] * v2[i];
133
134 return (int)(p >> 31);
135}
136
137static void butterflies_fixed_c(int *v1, int *v2, int len)
138{
139 int i;
140
141 for (i = 0; i < len; i++){
142 int t = v1[i] - v2[i];
143 v1[i] += v2[i];
144 v2[i] = t;
145 }
146}
147
148AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact)
149{
150 AVFixedDSPContext * fdsp = av_malloc(sizeof(AVFixedDSPContext));
151
152 if (!fdsp)
153 return NULL;
154
155 fdsp->vector_fmul_window_scaled = vector_fmul_window_scaled_c;
156 fdsp->vector_fmul_window = vector_fmul_window_c;
157 fdsp->vector_fmul = vector_fmul_c;
158 fdsp->vector_fmul_add = vector_fmul_add_c;
159 fdsp->vector_fmul_reverse = vector_fmul_reverse_c;
160 fdsp->butterflies_fixed = butterflies_fixed_c;
161 fdsp->scalarproduct_fixed = scalarproduct_fixed_c;
162
163 if (ARCH_X86)
164 ff_fixed_dsp_init_x86(fdsp);
165
166 return fdsp;
167}
168
generated by cgit at 2024-05-17 03:06:36 (GMT)