FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
fixed_dsp.c
Go to the documentation of this file.
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 
50 static 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 
60 static 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 
72 static 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 
93 static 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 
113 static 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 
124 static int ff_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 
137 static 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 
149 {
151 
152  if (!fdsp)
153  return NULL;
154 
157  fdsp->vector_fmul = vector_fmul_c;
162 
163  return fdsp;
164 }
#define NULL
Definition: coverity.c:32
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)
Definition: fixed_dsp.c:72
int(* scalarproduct_fixed)(const int *v1, const int *v2, int len)
Calculate the scalar product of two vectors of integers.
Definition: fixed_dsp.h:144
uint8_t bits
Definition: crc.c:295
uint8_t
#define av_malloc(s)
static void vector_fmul_reverse_c(int *dst, const int *src0, const int *src1, int len)
Definition: fixed_dsp.c:60
AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact)
Allocate and initialize a fixed DSP context.
Definition: fixed_dsp.c:148
void(* vector_fmul_window_scaled)(int16_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len, uint8_t bits)
Overlap/add with window function.
Definition: fixed_dsp.h:80
void(* vector_fmul_reverse)(int *dst, const int *src0, const int *src1, int len)
Definition: fixed_dsp.h:116
#define s0
Definition: regdef.h:37
static void vector_fmul_add_c(int *dst, const int *src0, const int *src1, const int *src2, int len)
Definition: fixed_dsp.c:50
void(* butterflies_fixed)(int *av_restrict v1, int *av_restrict v2, int len)
Calculate the sum and difference of two vectors of integers.
Definition: fixed_dsp.h:153
static av_always_inline av_const double round(double x)
Definition: libm.h:162
static void butterflies_fixed_c(int *v1, int *v2, int len)
Definition: fixed_dsp.c:137
int32_t
static void vector_fmul_c(int *dst, const int *src0, const int *src1, int len)
Definition: fixed_dsp.c:113
void(* vector_fmul_add)(int *dst, const int *src0, const int *src1, const int *src2, int len)
Calculate the entry wise product of two vectors of integers, add a third vector of integers and store...
Definition: fixed_dsp.h:132
#define s1
Definition: regdef.h:38
void(* vector_fmul)(int *dst, const int *src0, const int *src1, int len)
Fixed-point multiplication that calculates the entry wise product of two vectors of integers and stor...
Definition: fixed_dsp.h:113
static int ff_scalarproduct_fixed_c(const int *v1, const int *v2, int len)
Definition: fixed_dsp.c:124
static void vector_fmul_window_c(int32_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len)
Definition: fixed_dsp.c:93
int len
void(* vector_fmul_window)(int32_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len)
Overlap/add with window function.
Definition: fixed_dsp.h:98