FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/idctdsp.c
Date: 2025-07-18 13:13:50
Exec Total Coverage
Lines: 126 172 73.3%
Functions: 10 16 62.5%
Branches: 45 57 78.9%
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 "config_components.h"
21 #include "libavutil/attributes.h"
22 #include "libavutil/common.h"
23 #include "avcodec.h"
24 #include "dct.h"
25 #include "faanidct.h"
26 #include "idctdsp.h"
27 #include "simple_idct.h"
28 #include "xvididct.h"
29
30 16527 av_cold void ff_permute_scantable(uint8_t dst[64], const uint8_t src[64],
31 const uint8_t permutation[64])
32 {
33
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 1074255 for (int i = 0; i < 64; i++) {
34 1057728 int j = src[i];
35 1057728 dst[i] = permutation[j];
36 }
37 16527 }
38
39 1671 av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation,
40 enum idct_permutation_type perm_type)
41 {
42 int i;
43
44 #if ARCH_X86
45
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 1671 if (ff_init_scantable_permutation_x86(idct_permutation,
46 perm_type))
47 2 return;
48 #endif
49
50
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 1669 switch (perm_type) {
51 1419 case FF_IDCT_PERM_NONE:
52
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 92235 for (i = 0; i < 64; i++)
53 90816 idct_permutation[i] = i;
54 1419 break;
55 4 case FF_IDCT_PERM_LIBMPEG2:
56
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 260 for (i = 0; i < 64; i++)
57 256 idct_permutation[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
58 4 break;
59 246 case FF_IDCT_PERM_TRANSPOSE:
60
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 15990 for (i = 0; i < 64; i++)
61 15744 idct_permutation[i] = ((i & 7) << 3) | (i >> 3);
62 246 break;
63 ✗ case FF_IDCT_PERM_PARTTRANS:
64 ✗ for (i = 0; i < 64; i++)
65 ✗ idct_permutation[i] = (i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3);
66 ✗ break;
67 ✗ default:
68 ✗ av_log(NULL, AV_LOG_ERROR,
69 "Internal error, IDCT permutation not set\n");
70 }
71 }
72
73 163833 void ff_put_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
74 ptrdiff_t line_size)
75 {
76 int i;
77
78 /* read the pixels */
79
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 1474497 for (i = 0; i < 8; i++) {
80 1310664 pixels[0] = av_clip_uint8(block[0]);
81 1310664 pixels[1] = av_clip_uint8(block[1]);
82 1310664 pixels[2] = av_clip_uint8(block[2]);
83 1310664 pixels[3] = av_clip_uint8(block[3]);
84 1310664 pixels[4] = av_clip_uint8(block[4]);
85 1310664 pixels[5] = av_clip_uint8(block[5]);
86 1310664 pixels[6] = av_clip_uint8(block[6]);
87 1310664 pixels[7] = av_clip_uint8(block[7]);
88
89 1310664 pixels += line_size;
90 1310664 block += 8;
91 }
92 163833 }
93
94 14262 static void put_pixels_clamped4_c(const int16_t *block, uint8_t *restrict pixels,
95 int line_size)
96 {
97 int i;
98
99 /* read the pixels */
100
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 71310 for(i=0;i<4;i++) {
101 57048 pixels[0] = av_clip_uint8(block[0]);
102 57048 pixels[1] = av_clip_uint8(block[1]);
103 57048 pixels[2] = av_clip_uint8(block[2]);
104 57048 pixels[3] = av_clip_uint8(block[3]);
105
106 57048 pixels += line_size;
107 57048 block += 8;
108 }
109 14262 }
110
111 ✗ static void put_pixels_clamped2_c(const int16_t *block, uint8_t *restrict pixels,
112 int line_size)
113 {
114 int i;
115
116 /* read the pixels */
117 ✗ for(i=0;i<2;i++) {
118 ✗ pixels[0] = av_clip_uint8(block[0]);
119 ✗ pixels[1] = av_clip_uint8(block[1]);
120
121 ✗ pixels += line_size;
122 ✗ block += 8;
123 }
124 ✗ }
125
126 1102033 static void put_signed_pixels_clamped_c(const int16_t *block,
127 uint8_t *restrict pixels,
128 ptrdiff_t line_size)
129 {
130 int i, j;
131
132
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133
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 79346376 for (j = 0; j < 8; j++) {
134
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 70530112 if (*block < -128)
135 119 *pixels = 0;
136
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 70529993 else if (*block > 127)
137 44021 *pixels = 255;
138 else
139 70485972 *pixels = (uint8_t) (*block + 128);
140 70530112 block++;
141 70530112 pixels++;
142 }
143 8816264 pixels += (line_size - 8);
144 }
145 1102033 }
146
147 452108 void ff_add_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
148 ptrdiff_t line_size)
149 {
150 int i;
151
152 /* read the pixels */
153
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 4068972 for (i = 0; i < 8; i++) {
154 3616864 pixels[0] = av_clip_uint8(pixels[0] + block[0]);
155 3616864 pixels[1] = av_clip_uint8(pixels[1] + block[1]);
156 3616864 pixels[2] = av_clip_uint8(pixels[2] + block[2]);
157 3616864 pixels[3] = av_clip_uint8(pixels[3] + block[3]);
158 3616864 pixels[4] = av_clip_uint8(pixels[4] + block[4]);
159 3616864 pixels[5] = av_clip_uint8(pixels[5] + block[5]);
160 3616864 pixels[6] = av_clip_uint8(pixels[6] + block[6]);
161 3616864 pixels[7] = av_clip_uint8(pixels[7] + block[7]);
162 3616864 pixels += line_size;
163 3616864 block += 8;
164 }
165 452108 }
166
167 73763 static void add_pixels_clamped4_c(const int16_t *block, uint8_t *restrict pixels,
168 int line_size)
169 {
170 int i;
171
172 /* read the pixels */
173
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 368815 for(i=0;i<4;i++) {
174 295052 pixels[0] = av_clip_uint8(pixels[0] + block[0]);
175 295052 pixels[1] = av_clip_uint8(pixels[1] + block[1]);
176 295052 pixels[2] = av_clip_uint8(pixels[2] + block[2]);
177 295052 pixels[3] = av_clip_uint8(pixels[3] + block[3]);
178 295052 pixels += line_size;
179 295052 block += 8;
180 }
181 73763 }
182
183 ✗ static void add_pixels_clamped2_c(const int16_t *block, uint8_t *restrict pixels,
184 int line_size)
185 {
186 int i;
187
188 /* read the pixels */
189 ✗ for(i=0;i<2;i++) {
190 ✗ pixels[0] = av_clip_uint8(pixels[0] + block[0]);
191 ✗ pixels[1] = av_clip_uint8(pixels[1] + block[1]);
192 ✗ pixels += line_size;
193 ✗ block += 8;
194 }
195 ✗ }
196
197 14262 static void ff_jref_idct4_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
198 {
199 14262 ff_j_rev_dct4 (block);
200 14262 put_pixels_clamped4_c(block, dest, line_size);
201 14262 }
202 73763 static void ff_jref_idct4_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
203 {
204 73763 ff_j_rev_dct4 (block);
205 73763 add_pixels_clamped4_c(block, dest, line_size);
206 73763 }
207
208 ✗ static void ff_jref_idct2_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
209 {
210 ✗ ff_j_rev_dct2 (block);
211 ✗ put_pixels_clamped2_c(block, dest, line_size);
212 ✗ }
213 ✗ static void ff_jref_idct2_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
214 {
215 ✗ ff_j_rev_dct2 (block);
216 ✗ add_pixels_clamped2_c(block, dest, line_size);
217 ✗ }
218
219 ✗ static void ff_jref_idct1_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
220 {
221 ✗ dest[0] = av_clip_uint8((block[0] + 4)>>3);
222 ✗ }
223 ✗ static void ff_jref_idct1_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
224 {
225 ✗ dest[0] = av_clip_uint8(dest[0] + ((block[0] + 4)>>3));
226 ✗ }
227
228 1530 av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
229 {
230 1530 av_unused const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
231
232
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 1530 if (avctx->lowres==1) {
233 1 c->idct_put = ff_jref_idct4_put;
234 1 c->idct_add = ff_jref_idct4_add;
235 1 c->idct = ff_j_rev_dct4;
236 1 c->perm_type = FF_IDCT_PERM_NONE;
237
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 1529 } else if (avctx->lowres==2) {
238 ✗ c->idct_put = ff_jref_idct2_put;
239 ✗ c->idct_add = ff_jref_idct2_add;
240 ✗ c->idct = ff_j_rev_dct2;
241 ✗ c->perm_type = FF_IDCT_PERM_NONE;
242
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 1529 } else if (avctx->lowres==3) {
243 ✗ c->idct_put = ff_jref_idct1_put;
244 ✗ c->idct_add = ff_jref_idct1_add;
245 ✗ c->idct = ff_j_rev_dct1;
246 ✗ c->perm_type = FF_IDCT_PERM_NONE;
247 } else {
248
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 1529 if (avctx->bits_per_raw_sample == 10 || avctx->bits_per_raw_sample == 9) {
249 /* 10-bit MPEG-4 Simple Studio Profile requires a higher precision IDCT
250 However, it only uses idct_put */
251
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 25 if (c->mpeg4_studio_profile) {
252 1 c->idct_put = ff_simple_idct_put_int32_10bit;
253 1 c->idct_add = NULL;
254 1 c->idct = NULL;
255 } else {
256 24 c->idct_put = ff_simple_idct_put_int16_10bit;
257 24 c->idct_add = ff_simple_idct_add_int16_10bit;
258 24 c->idct = ff_simple_idct_int16_10bit;
259 }
260 25 c->perm_type = FF_IDCT_PERM_NONE;
261
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 1504 } else if (avctx->bits_per_raw_sample == 12) {
262 4 c->idct_put = ff_simple_idct_put_int16_12bit;
263 4 c->idct_add = ff_simple_idct_add_int16_12bit;
264 4 c->idct = ff_simple_idct_int16_12bit;
265 4 c->perm_type = FF_IDCT_PERM_NONE;
266 } else {
267
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 1500 if (avctx->idct_algo == FF_IDCT_INT) {
268 4 c->idct_put = ff_jref_idct_put;
269 4 c->idct_add = ff_jref_idct_add;
270 4 c->idct = ff_j_rev_dct;
271 4 c->perm_type = FF_IDCT_PERM_LIBMPEG2;
272 #if CONFIG_FAANIDCT
273
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 1496 } else if (avctx->idct_algo == FF_IDCT_FAAN) {
274 ✗ c->idct_put = ff_faanidct_put;
275 ✗ c->idct_add = ff_faanidct_add;
276 ✗ c->idct = ff_faanidct;
277 ✗ c->perm_type = FF_IDCT_PERM_NONE;
278 #endif /* CONFIG_FAANIDCT */
279 #if CONFIG_MPEG4_DECODER
280
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 1496 } else if (avctx->idct_algo == FF_IDCT_XVID) {
281 4 ff_xvid_idct_init(c);
282 #endif
283 } else { // accurate/default
284 1492 c->idct_put = ff_simple_idct_put_int16_8bit;
285 1492 c->idct_add = ff_simple_idct_add_int16_8bit;
286 1492 c->idct = ff_simple_idct_int16_8bit;
287 1492 c->perm_type = FF_IDCT_PERM_NONE;
288 }
289 }
290 }
291
292 1530 c->put_pixels_clamped = ff_put_pixels_clamped_c;
293 1530 c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
294 1530 c->add_pixels_clamped = ff_add_pixels_clamped_c;
295
296 #if ARCH_AARCH64
297 ff_idctdsp_init_aarch64(c, avctx, high_bit_depth);
298 #elif ARCH_ARM
299 ff_idctdsp_init_arm(c, avctx, high_bit_depth);
300 #elif ARCH_PPC
301 ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
302 #elif ARCH_RISCV
303 ff_idctdsp_init_riscv(c, avctx, high_bit_depth);
304 #elif ARCH_X86
305 1530 ff_idctdsp_init_x86(c, avctx, high_bit_depth);
306 #elif ARCH_MIPS
307 ff_idctdsp_init_mips(c, avctx, high_bit_depth);
308 #elif ARCH_LOONGARCH
309 ff_idctdsp_init_loongarch(c, avctx, high_bit_depth);
310 #endif
311
312 1530 ff_init_scantable_permutation(c->idct_permutation,
313 c->perm_type);
314 1530 }
315