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jpeg2000dsp.c
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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 + (((i_ict_params[0] * *src2) + (1 << 15)) >> 16);
68  i1 = *src0 - (((i_ict_params[1] * *src1) + (1 << 15)) >> 16)
69  - (((i_ict_params[2] * *src2) + (1 << 15)) >> 16);
70  i2 = *src0 + (((i_ict_params[3] * *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 }