summaryrefslogtreecommitdiff
path: root/libavutil/fixed_dsp.c
blob: f1b195f1840b113fbc82ca20b5048bf92f79c13c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/*
 * Copyright (c) 2012
 *      MIPS Technologies, Inc., California.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Author:  Nedeljko Babic (nedeljko.babic imgtec com)
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "fixed_dsp.h"

static void vector_fmul_add_c(int *dst, const int *src0, const int *src1, const int *src2, int len){
    int i;
    int64_t accu;

    for (i=0; i<len; i++) {
        accu = (int64_t)src0[i] * src1[i];
        dst[i] = src2[i] + (int)((accu + 0x40000000) >> 31);
    }
}

static void vector_fmul_reverse_c(int *dst, const int *src0, const int *src1, int len)
{
    int i;
    int64_t accu;

    src1 += len-1;
    for (i=0; i<len; i++) {
        accu = (int64_t)src0[i] * src1[-i];
        dst[i] = (int)((accu+0x40000000) >> 31);
    }
}

static void vector_fmul_window_scaled_c(int16_t *dst, const int32_t *src0,
                                       const int32_t *src1, const int32_t *win,
                                       int len, uint8_t bits)
{
    int32_t s0, s1, wi, wj, i,j, round;

    dst += len;
    win += len;
    src0+= len;
    round = bits? 1 << (bits-1) : 0;

    for (i=-len, j=len-1; i<0; i++, j--) {
        s0 = src0[i];
        s1 = src1[j];
        wi = win[i];
        wj = win[j];
        dst[i] = av_clip_int16(((((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31) + round) >> bits);
        dst[j] = av_clip_int16(((((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31) + round) >> bits);
    }
}

static void vector_fmul_window_c(int32_t *dst, const int32_t *src0,
                                       const int32_t *src1, const int32_t *win,
                                       int len)
{
    int32_t s0, s1, wi, wj, i, j;

    dst += len;
    win += len;
    src0+= len;

    for (i=-len, j=len-1; i<0; i++, j--) {
        s0 = src0[i];
        s1 = src1[j];
        wi = win[i];
        wj = win[j];
        dst[i] = ((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31;
        dst[j] = ((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31;
    }
}

static void vector_fmul_c(int *dst, const int *src0, const int *src1, int len)
{
    int i;
    int64_t accu;

    for (i = 0; i < len; i++){
        accu = (int64_t)src0[i] * src1[i];
        dst[i] = (int)((accu+0x40000000) >> 31);
    }
}

static int scalarproduct_fixed_c(const int *v1, const int *v2, int len)
{
    /** p is initialized with 0x40000000 so that the proper rounding will occur
      * at the end */
    int64_t p = 0x40000000;
    int i;

    for (i = 0; i < len; i++)
        p += (int64_t)v1[i] * v2[i];

    return (int)(p >> 31);
}

static void butterflies_fixed_c(int *v1s, int *v2, int len)
{
    int i;
    unsigned int *v1 = v1s;

    for (i = 0; i < len; i++){
        int t = v1[i] - v2[i];
        v1[i] += v2[i];
        v2[i] = t;
    }
}

AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact)
{
    AVFixedDSPContext * fdsp = av_malloc(sizeof(AVFixedDSPContext));

    if (!fdsp)
        return NULL;

    fdsp->vector_fmul_window_scaled = vector_fmul_window_scaled_c;
    fdsp->vector_fmul_window = vector_fmul_window_c;
    fdsp->vector_fmul = vector_fmul_c;
    fdsp->vector_fmul_add = vector_fmul_add_c;
    fdsp->vector_fmul_reverse = vector_fmul_reverse_c;
    fdsp->butterflies_fixed = butterflies_fixed_c;
    fdsp->scalarproduct_fixed = scalarproduct_fixed_c;

    if (ARCH_X86)
        ff_fixed_dsp_init_x86(fdsp);

    return fdsp;
}