FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/wmv2dsp.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 81 81 100.0%
Functions: 5 5 100.0%
Branches: 12 12 100.0%
Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "config.h"
20 #include "libavutil/attributes.h"
21 #include "libavutil/common.h"
22 #include "idctdsp.h"
23 #include "mathops.h"
24 #include "wmv2dsp.h"
25
26 #define W0 2048
27 #define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */
28 #define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */
29 #define W3 2408 /* 2048*sqrt (2)*cos (3*pi/16) */
30 #define W4 2048 /* 2048*sqrt (2)*cos (4*pi/16) */
31 #define W5 1609 /* 2048*sqrt (2)*cos (5*pi/16) */
32 #define W6 1108 /* 2048*sqrt (2)*cos (6*pi/16) */
33 #define W7 565 /* 2048*sqrt (2)*cos (7*pi/16) */
34
35 3017024 static void wmv2_idct_row(short * b)
36 {
37 int s1, s2;
38 int a0, a1, a2, a3, a4, a5, a6, a7;
39
40 /* step 1 */
41 3017024 a1 = W1 * b[1] + W7 * b[7];
42 3017024 a7 = W7 * b[1] - W1 * b[7];
43 3017024 a5 = W5 * b[5] + W3 * b[3];
44 3017024 a3 = W3 * b[5] - W5 * b[3];
45 3017024 a2 = W2 * b[2] + W6 * b[6];
46 3017024 a6 = W6 * b[2] - W2 * b[6];
47 3017024 a0 = W0 * b[0] + W0 * b[4];
48 3017024 a4 = W0 * b[0] - W0 * b[4];
49
50 /* step 2 */
51 3017024 s1 = (int)(181U * (a1 - a5 + a7 - a3) + 128) >> 8; // 1, 3, 5, 7
52 3017024 s2 = (int)(181U * (a1 - a5 - a7 + a3) + 128) >> 8;
53
54 /* step 3 */
55 3017024 b[0] = (a0 + a2 + a1 + a5 + (1 << 7)) >> 8;
56 3017024 b[1] = (a4 + a6 + s1 + (1 << 7)) >> 8;
57 3017024 b[2] = (a4 - a6 + s2 + (1 << 7)) >> 8;
58 3017024 b[3] = (a0 - a2 + a7 + a3 + (1 << 7)) >> 8;
59 3017024 b[4] = (a0 - a2 - a7 - a3 + (1 << 7)) >> 8;
60 3017024 b[5] = (a4 - a6 - s2 + (1 << 7)) >> 8;
61 3017024 b[6] = (a4 + a6 - s1 + (1 << 7)) >> 8;
62 3017024 b[7] = (a0 + a2 - a1 - a5 + (1 << 7)) >> 8;
63 3017024 }
64
65 3017024 static void wmv2_idct_col(short * b)
66 {
67 int s1, s2;
68 int a0, a1, a2, a3, a4, a5, a6, a7;
69
70 /* step 1, with extended precision */
71 3017024 a1 = (W1 * b[8 * 1] + W7 * b[8 * 7] + 4) >> 3;
72 3017024 a7 = (W7 * b[8 * 1] - W1 * b[8 * 7] + 4) >> 3;
73 3017024 a5 = (W5 * b[8 * 5] + W3 * b[8 * 3] + 4) >> 3;
74 3017024 a3 = (W3 * b[8 * 5] - W5 * b[8 * 3] + 4) >> 3;
75 3017024 a2 = (W2 * b[8 * 2] + W6 * b[8 * 6] + 4) >> 3;
76 3017024 a6 = (W6 * b[8 * 2] - W2 * b[8 * 6] + 4) >> 3;
77 3017024 a0 = (W0 * b[8 * 0] + W0 * b[8 * 4] ) >> 3;
78 3017024 a4 = (W0 * b[8 * 0] - W0 * b[8 * 4] ) >> 3;
79
80 /* step 2 */
81 3017024 s1 = (int)(181U * (a1 - a5 + a7 - a3) + 128) >> 8;
82 3017024 s2 = (int)(181U * (a1 - a5 - a7 + a3) + 128) >> 8;
83
84 /* step 3 */
85 3017024 b[8 * 0] = (a0 + a2 + a1 + a5 + (1 << 13)) >> 14;
86 3017024 b[8 * 1] = (a4 + a6 + s1 + (1 << 13)) >> 14;
87 3017024 b[8 * 2] = (a4 - a6 + s2 + (1 << 13)) >> 14;
88 3017024 b[8 * 3] = (a0 - a2 + a7 + a3 + (1 << 13)) >> 14;
89
90 3017024 b[8 * 4] = (a0 - a2 - a7 - a3 + (1 << 13)) >> 14;
91 3017024 b[8 * 5] = (a4 - a6 - s2 + (1 << 13)) >> 14;
92 3017024 b[8 * 6] = (a4 + a6 - s1 + (1 << 13)) >> 14;
93 3017024 b[8 * 7] = (a0 + a2 - a1 - a5 + (1 << 13)) >> 14;
94 3017024 }
95
96 262288 static void wmv2_idct_add_c(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
97 {
98 int i;
99
100
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 2360592 for (i = 0; i < 64; i += 8)
101 2098304 wmv2_idct_row(block + i);
102
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 2360592 for (i = 0; i < 8; i++)
103 2098304 wmv2_idct_col(block + i);
104
105
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 2360592 for (i = 0; i < 8; i++) {
106 2098304 dest[0] = av_clip_uint8(dest[0] + block[0]);
107 2098304 dest[1] = av_clip_uint8(dest[1] + block[1]);
108 2098304 dest[2] = av_clip_uint8(dest[2] + block[2]);
109 2098304 dest[3] = av_clip_uint8(dest[3] + block[3]);
110 2098304 dest[4] = av_clip_uint8(dest[4] + block[4]);
111 2098304 dest[5] = av_clip_uint8(dest[5] + block[5]);
112 2098304 dest[6] = av_clip_uint8(dest[6] + block[6]);
113 2098304 dest[7] = av_clip_uint8(dest[7] + block[7]);
114 2098304 dest += line_size;
115 2098304 block += 8;
116 }
117 262288 }
118
119 114840 static void wmv2_idct_put_c(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
120 {
121 int i;
122
123
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 1033560 for (i = 0; i < 64; i += 8)
124 918720 wmv2_idct_row(block + i);
125
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 1033560 for (i = 0; i < 8; i++)
126 918720 wmv2_idct_col(block + i);
127
128
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 1033560 for (i = 0; i < 8; i++) {
129 918720 dest[0] = av_clip_uint8(block[0]);
130 918720 dest[1] = av_clip_uint8(block[1]);
131 918720 dest[2] = av_clip_uint8(block[2]);
132 918720 dest[3] = av_clip_uint8(block[3]);
133 918720 dest[4] = av_clip_uint8(block[4]);
134 918720 dest[5] = av_clip_uint8(block[5]);
135 918720 dest[6] = av_clip_uint8(block[6]);
136 918720 dest[7] = av_clip_uint8(block[7]);
137 918720 dest += line_size;
138 918720 block += 8;
139 }
140 114840 }
141
142 62 av_cold void ff_wmv2dsp_init(IDCTDSPContext *c)
143 {
144 62 c->idct_add = wmv2_idct_add_c;
145 62 c->idct_put = wmv2_idct_put_c;
146 62 c->idct = NULL;
147 62 c->perm_type = FF_IDCT_PERM_NONE;
148
149 #if ARCH_MIPS
150 ff_wmv2dsp_init_mips(c);
151 #endif
152 62 ff_init_scantable_permutation(c->idct_permutation,
153 c->perm_type);
154 62 }
155