FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264idct_template.c
Date: 2026-04-26 21:21:04
Exec Total Coverage
Lines: 203 203 100.0%
Functions: 41 51 80.4%
Branches: 70 70 100.0%
Line Branch Exec Source
1 /*
2 * H.264 IDCT
3 * Copyright (c) 2004-2011 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * H.264 IDCT.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28 #include "bit_depth_template.c"
29 #include "libavutil/common.h"
30 #include "h264_parse.h"
31 #include "h264idct.h"
32
33 109162114 void FUNCC(ff_h264_idct_add)(uint8_t *_dst, int16_t *_block, int stride)
34 {
35 int i;
36 109162114 pixel *dst = (pixel*)_dst;
37 109162114 dctcoef *block = (dctcoef*)_block;
38 109162114 stride >>= sizeof(pixel)-1;
39
40 109162114 block[0] += 1 << 5;
41
42
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43 436648456 const SUINT z0= block[i + 4*0] + (unsigned)block[i + 4*2];
44 436648456 const SUINT z1= block[i + 4*0] - (unsigned)block[i + 4*2];
45 436648456 const SUINT z2= (block[i + 4*1]>>1) - (unsigned)block[i + 4*3];
46 436648456 const SUINT z3= block[i + 4*1] + (unsigned)(block[i + 4*3]>>1);
47
48 436648456 block[i + 4*0]= z0 + z3;
49 436648456 block[i + 4*1]= z1 + z2;
50 436648456 block[i + 4*2]= z1 - z2;
51 436648456 block[i + 4*3]= z0 - z3;
52 }
53
54
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55 436648456 const SUINT z0= block[0 + 4*i] + (SUINT)block[2 + 4*i];
56 436648456 const SUINT z1= block[0 + 4*i] - (SUINT)block[2 + 4*i];
57 436648456 const SUINT z2= (block[1 + 4*i]>>1) - (SUINT)block[3 + 4*i];
58 436648456 const SUINT z3= block[1 + 4*i] + (SUINT)(block[3 + 4*i]>>1);
59
60 436648456 dst[i + 0*stride]= av_clip_pixel(dst[i + 0*stride] + ((int)(z0 + z3) >> 6));
61 436648456 dst[i + 1*stride]= av_clip_pixel(dst[i + 1*stride] + ((int)(z1 + z2) >> 6));
62 436648456 dst[i + 2*stride]= av_clip_pixel(dst[i + 2*stride] + ((int)(z1 - z2) >> 6));
63 436648456 dst[i + 3*stride]= av_clip_pixel(dst[i + 3*stride] + ((int)(z0 - z3) >> 6));
64 }
65
66 109162114 memset(block, 0, 16 * sizeof(dctcoef));
67 109162114 }
68
69 13600716 void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, int16_t *_block, int stride){
70 int i;
71 13600716 pixel *dst = (pixel*)_dst;
72 13600716 dctcoef *block = (dctcoef*)_block;
73 13600716 stride >>= sizeof(pixel)-1;
74
75 13600716 block[0] += 32;
76
77
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78 {
79 108805728 const unsigned int a0 = block[i+0*8] + (unsigned)block[i+4*8];
80 108805728 const unsigned int a2 = block[i+0*8] - (unsigned)block[i+4*8];
81 108805728 const unsigned int a4 = (block[i+2*8]>>1) - (unsigned)block[i+6*8];
82 108805728 const unsigned int a6 = (block[i+6*8]>>1) + (unsigned)block[i+2*8];
83
84 108805728 const unsigned int b0 = a0 + a6;
85 108805728 const unsigned int b2 = a2 + a4;
86 108805728 const unsigned int b4 = a2 - a4;
87 108805728 const unsigned int b6 = a0 - a6;
88
89 108805728 const int a1 = -block[i+3*8] + (unsigned)block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1);
90 108805728 const int a3 = block[i+1*8] + (unsigned)block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1);
91 108805728 const int a5 = -block[i+1*8] + (unsigned)block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1);
92 108805728 const int a7 = block[i+3*8] + (unsigned)block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1);
93
94 108805728 const int b1 = (a7>>2) + (unsigned)a1;
95 108805728 const int b3 = (unsigned)a3 + (a5>>2);
96 108805728 const int b5 = (a3>>2) - (unsigned)a5;
97 108805728 const int b7 = (unsigned)a7 - (a1>>2);
98
99 108805728 block[i+0*8] = b0 + b7;
100 108805728 block[i+7*8] = b0 - b7;
101 108805728 block[i+1*8] = b2 + b5;
102 108805728 block[i+6*8] = b2 - b5;
103 108805728 block[i+2*8] = b4 + b3;
104 108805728 block[i+5*8] = b4 - b3;
105 108805728 block[i+3*8] = b6 + b1;
106 108805728 block[i+4*8] = b6 - b1;
107 }
108
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109 {
110 108805728 const unsigned a0 = block[0+i*8] + (unsigned)block[4+i*8];
111 108805728 const unsigned a2 = block[0+i*8] - (unsigned)block[4+i*8];
112 108805728 const unsigned a4 = (block[2+i*8]>>1) - (unsigned)block[6+i*8];
113 108805728 const unsigned a6 = (block[6+i*8]>>1) + (unsigned)block[2+i*8];
114
115 108805728 const unsigned b0 = a0 + a6;
116 108805728 const unsigned b2 = a2 + a4;
117 108805728 const unsigned b4 = a2 - a4;
118 108805728 const unsigned b6 = a0 - a6;
119
120 108805728 const int a1 = -(unsigned)block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1);
121 108805728 const int a3 = (unsigned)block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1);
122 108805728 const int a5 = -(unsigned)block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1);
123 108805728 const int a7 = (unsigned)block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1);
124
125 108805728 const unsigned b1 = (a7>>2) + (unsigned)a1;
126 108805728 const unsigned b3 = (unsigned)a3 + (a5>>2);
127 108805728 const unsigned b5 = (a3>>2) - (unsigned)a5;
128 108805728 const unsigned b7 = (unsigned)a7 - (a1>>2);
129
130 108805728 dst[i + 0*stride] = av_clip_pixel( dst[i + 0*stride] + ((int)(b0 + b7) >> 6) );
131 108805728 dst[i + 1*stride] = av_clip_pixel( dst[i + 1*stride] + ((int)(b2 + b5) >> 6) );
132 108805728 dst[i + 2*stride] = av_clip_pixel( dst[i + 2*stride] + ((int)(b4 + b3) >> 6) );
133 108805728 dst[i + 3*stride] = av_clip_pixel( dst[i + 3*stride] + ((int)(b6 + b1) >> 6) );
134 108805728 dst[i + 4*stride] = av_clip_pixel( dst[i + 4*stride] + ((int)(b6 - b1) >> 6) );
135 108805728 dst[i + 5*stride] = av_clip_pixel( dst[i + 5*stride] + ((int)(b4 - b3) >> 6) );
136 108805728 dst[i + 6*stride] = av_clip_pixel( dst[i + 6*stride] + ((int)(b2 - b5) >> 6) );
137 108805728 dst[i + 7*stride] = av_clip_pixel( dst[i + 7*stride] + ((int)(b0 - b7) >> 6) );
138 }
139
140 13600716 memset(block, 0, 64 * sizeof(dctcoef));
141 13600716 }
142
143 // assumes all AC coefs are 0
144 58542102 void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, int16_t *_block, int stride){
145 int i, j;
146 58542102 pixel *dst = (pixel*)_dst;
147 58542102 dctcoef *block = (dctcoef*)_block;
148 58542102 int dc = (block[0] + 32) >> 6;
149 58542102 stride /= sizeof(pixel);
150 58542102 block[0] = 0;
151
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152 {
153
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154 936673632 dst[i] = av_clip_pixel( dst[i] + dc );
155 234168408 dst += stride;
156 }
157 58542102 }
158
159 1254788 void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, int16_t *_block, int stride){
160 int i, j;
161 1254788 pixel *dst = (pixel*)_dst;
162 1254788 dctcoef *block = (dctcoef*)_block;
163 1254788 int dc = (block[0] + 32) >> 6;
164 1254788 block[0] = 0;
165 1254788 stride /= sizeof(pixel);
166
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167 {
168
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169 80306432 dst[i] = av_clip_pixel( dst[i] + dc );
170 10038304 dst += stride;
171 }
172 1254788 }
173
174 9790470 void FUNCC(ff_h264_idct_add16)(uint8_t *dst, const int *block_offset,
175 int16_t *block, int stride,
176 const uint8_t nnzc[5 * 8])
177 {
178 int i;
179
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180 156647520 int nnz = nnzc[ scan8[i] ];
181
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 156647520 if(nnz){
182
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 58630928 if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
183 49278368 else FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
184 }
185 }
186 9790470 }
187
188 1979654 void FUNCC(ff_h264_idct_add16intra)(uint8_t *dst, const int *block_offset,
189 int16_t *block, int stride,
190 const uint8_t nnzc[5 * 8])
191 {
192 int i;
193
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194
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 31674464 if(nnzc[ scan8[i] ]) FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
195
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 24142774 else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
196 }
197 1979654 }
198
199 1844266 void FUNCC(ff_h264_idct8_add4)(uint8_t *dst, const int *block_offset,
200 int16_t *block, int stride,
201 const uint8_t nnzc[5 * 8])
202 {
203 int i;
204
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205 7377064 int nnz = nnzc[ scan8[i] ];
206
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207
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 4670212 if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct8_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
208 3903362 else FUNCC(ff_h264_idct8_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
209 }
210 }
211 1844266 }
212
213 9054256 void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){
214 int i, j;
215
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216
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217
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 72434048 if(nnzc[ scan8[i] ])
218 16625196 FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
219
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 55808852 else if(((dctcoef*)block)[i*16])
220 25681296 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
221 }
222 }
223 9054256 }
224
225 1350636 void FUNCC(ff_h264_idct_add8_422)(uint8_t **dest, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){
226 int i, j;
227
228
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229
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230
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 10805088 if(nnzc[ scan8[i] ])
231 3641714 FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
232
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 7163374 else if(((dctcoef*)block)[i*16])
233 4581790 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
234 }
235 }
236
237
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239
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 10805088 if(nnzc[ scan8[i+4] ])
240 3691780 FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride);
241
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 7113308 else if(((dctcoef*)block)[i*16])
242 4646866 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride);
243 }
244 }
245 1350636 }
246
247 #if BIT_DEPTH == 8 || BIT_DEPTH == 9
248 /**
249 * IDCT transforms the 16 dc values and dequantizes them.
250 * @param qmul quantization parameter
251 */
252 1193850 void FUNCC2(ff_h264_luma_dc_dequant_idct)(int16_t *_output, int16_t *_input, int qmul)
253 {
254 #define stride 16
255 int i;
256 int temp[16];
257 static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride};
258 1193850 dctcoef *input = (dctcoef*)_input;
259 1193850 dctcoef *output = (dctcoef*)_output;
260
261
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262 4775400 const int z0= input[4*i+0] + input[4*i+1];
263 4775400 const int z1= input[4*i+0] - input[4*i+1];
264 4775400 const int z2= input[4*i+2] - input[4*i+3];
265 4775400 const int z3= input[4*i+2] + input[4*i+3];
266
267 4775400 temp[4*i+0]= z0+z3;
268 4775400 temp[4*i+1]= z0-z3;
269 4775400 temp[4*i+2]= z1-z2;
270 4775400 temp[4*i+3]= z1+z2;
271 }
272
273
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274 4775400 const int offset= x_offset[i];
275 4775400 const SUINT z0= temp[4*0+i] + temp[4*2+i];
276 4775400 const SUINT z1= temp[4*0+i] - temp[4*2+i];
277 4775400 const SUINT z2= temp[4*1+i] - temp[4*3+i];
278 4775400 const SUINT z3= temp[4*1+i] + temp[4*3+i];
279
280 4775400 output[stride* 0+offset]= (int)((z0 + z3)*qmul + 128 ) >> 8;
281 4775400 output[stride* 1+offset]= (int)((z1 + z2)*qmul + 128 ) >> 8;
282 4775400 output[stride* 4+offset]= (int)((z1 - z2)*qmul + 128 ) >> 8;
283 4775400 output[stride* 5+offset]= (int)((z0 - z3)*qmul + 128 ) >> 8;
284 }
285 #undef stride
286 1193850 }
287
288 2252062 void FUNCC2(ff_h264_chroma422_dc_dequant_idct)(int16_t *_block, int qmul)
289 {
290 2252062 const int stride= 16*2;
291 2252062 const int xStride= 16;
292 int i;
293 unsigned temp[8];
294 static const uint8_t x_offset[2]={0, 16};
295 2252062 dctcoef *block = (dctcoef*)_block;
296
297
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298 9008248 temp[2*i+0] = block[stride*i + xStride*0] + (unsigned)block[stride*i + xStride*1];
299 9008248 temp[2*i+1] = block[stride*i + xStride*0] - (unsigned)block[stride*i + xStride*1];
300 }
301
302
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303 4504124 const int offset= x_offset[i];
304 4504124 const SUINT z0= temp[2*0+i] + temp[2*2+i];
305 4504124 const SUINT z1= temp[2*0+i] - temp[2*2+i];
306 4504124 const SUINT z2= temp[2*1+i] - temp[2*3+i];
307 4504124 const SUINT z3= temp[2*1+i] + temp[2*3+i];
308
309 4504124 block[stride*0+offset]= (int)((z0 + z3)*qmul + 128) >> 8;
310 4504124 block[stride*1+offset]= (int)((z1 + z2)*qmul + 128) >> 8;
311 4504124 block[stride*2+offset]= (int)((z1 - z2)*qmul + 128) >> 8;
312 4504124 block[stride*3+offset]= (int)((z0 - z3)*qmul + 128) >> 8;
313 }
314 2252062 }
315
316 13172282 void FUNCC2(ff_h264_chroma_dc_dequant_idct)(int16_t *_block, int qmul)
317 {
318 13172282 const int stride= 16*2;
319 13172282 const int xStride= 16;
320 SUINT a,b,c,d,e;
321 13172282 dctcoef *block = (dctcoef*)_block;
322
323 13172282 a= block[stride*0 + xStride*0];
324 13172282 b= block[stride*0 + xStride*1];
325 13172282 c= block[stride*1 + xStride*0];
326 13172282 d= block[stride*1 + xStride*1];
327
328 13172282 e= a-b;
329 13172282 a= a+b;
330 13172282 b= c-d;
331 13172282 c= c+d;
332
333 13172282 block[stride*0 + xStride*0]= (int)((a+c)*qmul) >> 7;
334 13172282 block[stride*0 + xStride*1]= (int)((e+b)*qmul) >> 7;
335 13172282 block[stride*1 + xStride*0]= (int)((a-c)*qmul) >> 7;
336 13172282 block[stride*1 + xStride*1]= (int)((e-b)*qmul) >> 7;
337 13172282 }
338 #endif
339