FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264idct_template.c
Date: 2026-09-17 21:53:11
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 109313050 void FUNCC(ff_h264_idct_add)(uint8_t *_dst, int16_t *_block, ptrdiff_t stride)
34 {
35 int i;
36 109313050 pixel *dst = (pixel*)_dst;
37 109313050 dctcoef *block = (dctcoef*)_block;
38 109313050 stride >>= sizeof(pixel)-1;
39
40 109313050 block[0] += 1 << 5;
41
42
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43 437252200 const SUINT z0= block[i + 4*0] + (unsigned)block[i + 4*2];
44 437252200 const SUINT z1= block[i + 4*0] - (unsigned)block[i + 4*2];
45 437252200 const SUINT z2= (block[i + 4*1]>>1) - (unsigned)block[i + 4*3];
46 437252200 const SUINT z3= block[i + 4*1] + (unsigned)(block[i + 4*3]>>1);
47
48 437252200 block[i + 4*0]= z0 + z3;
49 437252200 block[i + 4*1]= z1 + z2;
50 437252200 block[i + 4*2]= z1 - z2;
51 437252200 block[i + 4*3]= z0 - z3;
52 }
53
54
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55 437252200 const SUINT z0= block[0 + 4*i] + (SUINT)block[2 + 4*i];
56 437252200 const SUINT z1= block[0 + 4*i] - (SUINT)block[2 + 4*i];
57 437252200 const SUINT z2= (block[1 + 4*i]>>1) - (SUINT)block[3 + 4*i];
58 437252200 const SUINT z3= block[1 + 4*i] + (SUINT)(block[3 + 4*i]>>1);
59
60 437252200 dst[i + 0*stride]= av_clip_pixel(dst[i + 0*stride] + ((int)(z0 + z3) >> 6));
61 437252200 dst[i + 1*stride]= av_clip_pixel(dst[i + 1*stride] + ((int)(z1 + z2) >> 6));
62 437252200 dst[i + 2*stride]= av_clip_pixel(dst[i + 2*stride] + ((int)(z1 - z2) >> 6));
63 437252200 dst[i + 3*stride]= av_clip_pixel(dst[i + 3*stride] + ((int)(z0 - z3) >> 6));
64 }
65
66 109313050 memset(block, 0, 16 * sizeof(dctcoef));
67 109313050 }
68
69 13600964 void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, int16_t *_block, ptrdiff_t stride)
70 {
71 int i;
72 13600964 pixel *dst = (pixel*)_dst;
73 13600964 dctcoef *block = (dctcoef*)_block;
74 13600964 stride >>= sizeof(pixel)-1;
75
76 13600964 block[0] += 32;
77
78
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79 {
80 108807712 const unsigned int a0 = block[i+0*8] + (unsigned)block[i+4*8];
81 108807712 const unsigned int a2 = block[i+0*8] - (unsigned)block[i+4*8];
82 108807712 const unsigned int a4 = (block[i+2*8]>>1) - (unsigned)block[i+6*8];
83 108807712 const unsigned int a6 = (block[i+6*8]>>1) + (unsigned)block[i+2*8];
84
85 108807712 const unsigned int b0 = a0 + a6;
86 108807712 const unsigned int b2 = a2 + a4;
87 108807712 const unsigned int b4 = a2 - a4;
88 108807712 const unsigned int b6 = a0 - a6;
89
90 108807712 const int a1 = -block[i+3*8] + (unsigned)block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1);
91 108807712 const int a3 = block[i+1*8] + (unsigned)block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1);
92 108807712 const int a5 = -block[i+1*8] + (unsigned)block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1);
93 108807712 const int a7 = block[i+3*8] + (unsigned)block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1);
94
95 108807712 const int b1 = (a7>>2) + (unsigned)a1;
96 108807712 const int b3 = (unsigned)a3 + (a5>>2);
97 108807712 const int b5 = (a3>>2) - (unsigned)a5;
98 108807712 const int b7 = (unsigned)a7 - (a1>>2);
99
100 108807712 block[i+0*8] = b0 + b7;
101 108807712 block[i+7*8] = b0 - b7;
102 108807712 block[i+1*8] = b2 + b5;
103 108807712 block[i+6*8] = b2 - b5;
104 108807712 block[i+2*8] = b4 + b3;
105 108807712 block[i+5*8] = b4 - b3;
106 108807712 block[i+3*8] = b6 + b1;
107 108807712 block[i+4*8] = b6 - b1;
108 }
109
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110 {
111 108807712 const unsigned a0 = block[0+i*8] + (unsigned)block[4+i*8];
112 108807712 const unsigned a2 = block[0+i*8] - (unsigned)block[4+i*8];
113 108807712 const unsigned a4 = (block[2+i*8]>>1) - (unsigned)block[6+i*8];
114 108807712 const unsigned a6 = (block[6+i*8]>>1) + (unsigned)block[2+i*8];
115
116 108807712 const unsigned b0 = a0 + a6;
117 108807712 const unsigned b2 = a2 + a4;
118 108807712 const unsigned b4 = a2 - a4;
119 108807712 const unsigned b6 = a0 - a6;
120
121 108807712 const int a1 = -(unsigned)block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1);
122 108807712 const int a3 = (unsigned)block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1);
123 108807712 const int a5 = -(unsigned)block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1);
124 108807712 const int a7 = (unsigned)block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1);
125
126 108807712 const unsigned b1 = (a7>>2) + (unsigned)a1;
127 108807712 const unsigned b3 = (unsigned)a3 + (a5>>2);
128 108807712 const unsigned b5 = (a3>>2) - (unsigned)a5;
129 108807712 const unsigned b7 = (unsigned)a7 - (a1>>2);
130
131 108807712 dst[i + 0*stride] = av_clip_pixel( dst[i + 0*stride] + ((int)(b0 + b7) >> 6) );
132 108807712 dst[i + 1*stride] = av_clip_pixel( dst[i + 1*stride] + ((int)(b2 + b5) >> 6) );
133 108807712 dst[i + 2*stride] = av_clip_pixel( dst[i + 2*stride] + ((int)(b4 + b3) >> 6) );
134 108807712 dst[i + 3*stride] = av_clip_pixel( dst[i + 3*stride] + ((int)(b6 + b1) >> 6) );
135 108807712 dst[i + 4*stride] = av_clip_pixel( dst[i + 4*stride] + ((int)(b6 - b1) >> 6) );
136 108807712 dst[i + 5*stride] = av_clip_pixel( dst[i + 5*stride] + ((int)(b4 - b3) >> 6) );
137 108807712 dst[i + 6*stride] = av_clip_pixel( dst[i + 6*stride] + ((int)(b2 - b5) >> 6) );
138 108807712 dst[i + 7*stride] = av_clip_pixel( dst[i + 7*stride] + ((int)(b0 - b7) >> 6) );
139 }
140
141 13600964 memset(block, 0, 64 * sizeof(dctcoef));
142 13600964 }
143
144 // assumes all AC coefs are 0
145 58646382 void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, int16_t *_block, ptrdiff_t stride)
146 {
147 int i, j;
148 58646382 pixel *dst = (pixel*)_dst;
149 58646382 dctcoef *block = (dctcoef*)_block;
150 58646382 int dc = (block[0] + 32) >> 6;
151 58646382 stride /= sizeof(pixel);
152 58646382 block[0] = 0;
153
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154 {
155
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156 938342112 dst[i] = av_clip_pixel( dst[i] + dc );
157 234585528 dst += stride;
158 }
159 58646382 }
160
161 1255144 void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, int16_t *_block, ptrdiff_t stride)
162 {
163 int i, j;
164 1255144 pixel *dst = (pixel*)_dst;
165 1255144 dctcoef *block = (dctcoef*)_block;
166 1255144 int dc = (block[0] + 32) >> 6;
167 1255144 block[0] = 0;
168 1255144 stride /= sizeof(pixel);
169
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170 {
171
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172 80329216 dst[i] = av_clip_pixel( dst[i] + dc );
173 10041152 dst += stride;
174 }
175 1255144 }
176
177 9801560 void FUNCC(ff_h264_idct_add16)(uint8_t *dst, const int *block_offset,
178 int16_t *block, ptrdiff_t stride,
179 const uint8_t nnzc[5 * 8])
180 {
181 int i;
182
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183 156824960 int nnz = nnzc[ scan8[i] ];
184
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185
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 58672344 if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
186 49315966 else FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
187 }
188 }
189 9801560 }
190
191 1985642 void FUNCC(ff_h264_idct_add16intra)(uint8_t *dst, const int *block_offset,
192 int16_t *block, ptrdiff_t stride,
193 const uint8_t nnzc[5 * 8])
194 {
195 int i;
196
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197
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 31770272 if(nnzc[ scan8[i] ]) FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
198
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 24236962 else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
199 }
200 1985642 }
201
202 1844642 void FUNCC(ff_h264_idct8_add4)(uint8_t *dst, const int *block_offset,
203 int16_t *block, ptrdiff_t stride,
204 const uint8_t nnzc[5 * 8])
205 {
206 int i;
207
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208 7378568 int nnz = nnzc[ scan8[i] ];
209
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210
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 4670700 if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct8_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
211 3903508 else FUNCC(ff_h264_idct8_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
212 }
213 }
214 1844642 }
215
216 9075456 void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, int16_t *block,
217 ptrdiff_t stride, const uint8_t nnzc[15*8])
218 {
219 int i, j;
220
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221
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222
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 72603648 if(nnzc[ scan8[i] ])
223 16685496 FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
224
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 55918152 else if(((dctcoef*)block)[i*16])
225 25727476 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
226 }
227 }
228 9075456 }
229
230 1350636 void FUNCC(ff_h264_idct_add8_422)(uint8_t **dest, const int *block_offset,
231 int16_t *block, ptrdiff_t stride, const uint8_t nnzc[15*8])
232 {
233 int i, j;
234
235
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236
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237
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 10805088 if(nnzc[ scan8[i] ])
238 3641714 FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
239
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 7163374 else if(((dctcoef*)block)[i*16])
240 4581790 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
241 }
242 }
243
244
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246
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 10805088 if(nnzc[ scan8[i+4] ])
247 3691780 FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride);
248
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 7113308 else if(((dctcoef*)block)[i*16])
249 4646866 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride);
250 }
251 }
252 1350636 }
253
254 #if BIT_DEPTH == 8 || BIT_DEPTH == 9
255 /**
256 * IDCT transforms the 16 dc values and dequantizes them.
257 * @param qmul quantization parameter
258 */
259 1199774 void FUNCC2(ff_h264_luma_dc_dequant_idct)(int16_t *_output, int16_t *_input, int qmul)
260 {
261 #define stride 16
262 int i;
263 int temp[16];
264 static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride};
265 1199774 dctcoef *input = (dctcoef*)_input;
266 1199774 dctcoef *output = (dctcoef*)_output;
267
268
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269 4799096 const int z0= input[4*i+0] + input[4*i+1];
270 4799096 const int z1= input[4*i+0] - input[4*i+1];
271 4799096 const int z2= input[4*i+2] - input[4*i+3];
272 4799096 const int z3= input[4*i+2] + input[4*i+3];
273
274 4799096 temp[4*i+0]= z0+z3;
275 4799096 temp[4*i+1]= z0-z3;
276 4799096 temp[4*i+2]= z1-z2;
277 4799096 temp[4*i+3]= z1+z2;
278 }
279
280
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281 4799096 const int offset= x_offset[i];
282 4799096 const SUINT z0= temp[4*0+i] + temp[4*2+i];
283 4799096 const SUINT z1= temp[4*0+i] - temp[4*2+i];
284 4799096 const SUINT z2= temp[4*1+i] - temp[4*3+i];
285 4799096 const SUINT z3= temp[4*1+i] + temp[4*3+i];
286
287 4799096 output[stride* 0+offset]= (int)((z0 + z3)*qmul + 128 ) >> 8;
288 4799096 output[stride* 1+offset]= (int)((z1 + z2)*qmul + 128 ) >> 8;
289 4799096 output[stride* 4+offset]= (int)((z1 - z2)*qmul + 128 ) >> 8;
290 4799096 output[stride* 5+offset]= (int)((z0 - z3)*qmul + 128 ) >> 8;
291 }
292 #undef stride
293 1199774 }
294
295 2282330 void FUNCC2(ff_h264_chroma422_dc_dequant_idct)(int16_t *_block, int qmul)
296 {
297 2282330 const int stride= 16*2;
298 2282330 const int xStride= 16;
299 int i;
300 unsigned temp[8];
301 static const uint8_t x_offset[2]={0, 16};
302 2282330 dctcoef *block = (dctcoef*)_block;
303
304
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305 9129320 temp[2*i+0] = block[stride*i + xStride*0] + (unsigned)block[stride*i + xStride*1];
306 9129320 temp[2*i+1] = block[stride*i + xStride*0] - (unsigned)block[stride*i + xStride*1];
307 }
308
309
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310 4564660 const int offset= x_offset[i];
311 4564660 const SUINT z0= temp[2*0+i] + temp[2*2+i];
312 4564660 const SUINT z1= temp[2*0+i] - temp[2*2+i];
313 4564660 const SUINT z2= temp[2*1+i] - temp[2*3+i];
314 4564660 const SUINT z3= temp[2*1+i] + temp[2*3+i];
315
316 4564660 block[stride*0+offset]= (int)((z0 + z3)*qmul + 128) >> 8;
317 4564660 block[stride*1+offset]= (int)((z1 + z2)*qmul + 128) >> 8;
318 4564660 block[stride*2+offset]= (int)((z1 - z2)*qmul + 128) >> 8;
319 4564660 block[stride*3+offset]= (int)((z0 - z3)*qmul + 128) >> 8;
320 }
321 2282330 }
322
323 13208042 void FUNCC2(ff_h264_chroma_dc_dequant_idct)(int16_t *_block, int qmul)
324 {
325 13208042 const int stride= 16*2;
326 13208042 const int xStride= 16;
327 SUINT a,b,c,d,e;
328 13208042 dctcoef *block = (dctcoef*)_block;
329
330 13208042 a= block[stride*0 + xStride*0];
331 13208042 b= block[stride*0 + xStride*1];
332 13208042 c= block[stride*1 + xStride*0];
333 13208042 d= block[stride*1 + xStride*1];
334
335 13208042 e= a-b;
336 13208042 a= a+b;
337 13208042 b= c-d;
338 13208042 c= c+d;
339
340 13208042 block[stride*0 + xStride*0]= (int)((a+c)*qmul) >> 7;
341 13208042 block[stride*0 + xStride*1]= (int)((e+b)*qmul) >> 7;
342 13208042 block[stride*1 + xStride*0]= (int)((a-c)*qmul) >> 7;
343 13208042 block[stride*1 + xStride*1]= (int)((e-b)*qmul) >> 7;
344 13208042 }
345 #endif
346