FFmpeg
jpeg2000dsp.c
Go to the documentation of this file.
1 /*
2  * JPEG 2000 DSP functions
3  * Copyright (c) 2007 Kamil Nowosad
4  * Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "config.h"
24 #include "libavutil/attributes.h"
25 #include "jpeg2000dsp.h"
26 
27 /* Inverse ICT parameters in float and integer.
28  * int value = (float value) * (1<<16) */
29 static const float f_ict_params[4] = {
30  1.402f,
31  0.34413f,
32  0.71414f,
33  1.772f
34 };
35 
36 static const int i_ict_params[4] = {
37  91881,
38  22553,
39  46802,
40  116130
41 };
42 
43 static void ict_float(void *_src0, void *_src1, void *_src2, int csize)
44 {
45  float *src0 = _src0, *src1 = _src1, *src2 = _src2;
46  float i0f, i1f, i2f;
47  int i;
48 
49  for (i = 0; i < csize; i++) {
50  i0f = *src0 + (f_ict_params[0] * *src2);
51  i1f = *src0 - (f_ict_params[1] * *src1)
52  - (f_ict_params[2] * *src2);
53  i2f = *src0 + (f_ict_params[3] * *src1);
54  *src0++ = i0f;
55  *src1++ = i1f;
56  *src2++ = i2f;
57  }
58 }
59 
60 static void ict_int(void *_src0, void *_src1, void *_src2, int csize)
61 {
62  int32_t *src0 = _src0, *src1 = _src1, *src2 = _src2;
63  int32_t i0, i1, i2;
64  int i;
65 
66  for (i = 0; i < csize; i++) {
67  i0 = *src0 + *src2 + ((int)((26345U * *src2) + (1 << 15)) >> 16);
68  i1 = *src0 - ((int)(((unsigned)i_ict_params[1] * *src1) + (1 << 15)) >> 16)
69  - ((int)(((unsigned)i_ict_params[2] * *src2) + (1 << 15)) >> 16);
70  i2 = *src0 + (2 * *src1) + ((int)((-14942U * *src1) + (1 << 15)) >> 16);
71  *src0++ = i0;
72  *src1++ = i1;
73  *src2++ = i2;
74  }
75 }
76 
77 static void rct_int(void *_src0, void *_src1, void *_src2, int csize)
78 {
79  int32_t *src0 = _src0, *src1 = _src1, *src2 = _src2;
80  int32_t i0, i1, i2;
81  int i;
82 
83  for (i = 0; i < csize; i++) {
84  i1 = *src0 - (*src2 + *src1 >> 2);
85  i0 = i1 + *src2;
86  i2 = i1 + *src1;
87  *src0++ = i0;
88  *src1++ = i1;
89  *src2++ = i2;
90  }
91 }
92 
94 {
98 
99  if (ARCH_X86)
101 }
void(* mct_decode[FF_DWT_NB])(void *src0, void *src1, void *src2, int csize)
Definition: jpeg2000dsp.h:30
av_cold void ff_jpeg2000dsp_init(Jpeg2000DSPContext *c)
Definition: jpeg2000dsp.c:93
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:82
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
static const float f_ict_params[4]
Definition: jpeg2000dsp.c:29
#define U(x)
Definition: vp56_arith.h:37
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
static Float11 * i2f(int i, Float11 *f)
Definition: g726.c:45
void ff_jpeg2000dsp_init_x86(Jpeg2000DSPContext *c)
static void rct_int(void *_src0, void *_src1, void *_src2, int csize)
Definition: jpeg2000dsp.c:77
int32_t
#define src1
Definition: h264pred.c:139
static void ict_int(void *_src0, void *_src1, void *_src2, int csize)
Definition: jpeg2000dsp.c:60
#define src0
Definition: h264pred.c:138
static const int i_ict_params[4]
Definition: jpeg2000dsp.c:36
int
static void ict_float(void *_src0, void *_src1, void *_src2, int csize)
Definition: jpeg2000dsp.c:43