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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.h" | |
31 | #include "h264idct.h" | |
32 | ||
33 | void FUNCC(ff_h264_idct_add)(uint8_t *_dst, int16_t *_block, int stride) | |
34 | { | |
35 | int i; | |
36 | pixel *dst = (pixel*)_dst; | |
37 | dctcoef *block = (dctcoef*)_block; | |
38 | stride >>= sizeof(pixel)-1; | |
39 | ||
40 | block[0] += 1 << 5; | |
41 | ||
42 | for(i=0; i<4; i++){ | |
43 | const int z0= block[i + 4*0] + block[i + 4*2]; | |
44 | const int z1= block[i + 4*0] - block[i + 4*2]; | |
45 | const int z2= (block[i + 4*1]>>1) - block[i + 4*3]; | |
46 | const int z3= block[i + 4*1] + (block[i + 4*3]>>1); | |
47 | ||
48 | block[i + 4*0]= z0 + z3; | |
49 | block[i + 4*1]= z1 + z2; | |
50 | block[i + 4*2]= z1 - z2; | |
51 | block[i + 4*3]= z0 - z3; | |
52 | } | |
53 | ||
54 | for(i=0; i<4; i++){ | |
55 | const int z0= block[0 + 4*i] + block[2 + 4*i]; | |
56 | const int z1= block[0 + 4*i] - block[2 + 4*i]; | |
57 | const int z2= (block[1 + 4*i]>>1) - block[3 + 4*i]; | |
58 | const int z3= block[1 + 4*i] + (block[3 + 4*i]>>1); | |
59 | ||
60 | dst[i + 0*stride]= av_clip_pixel(dst[i + 0*stride] + ((z0 + z3) >> 6)); | |
61 | dst[i + 1*stride]= av_clip_pixel(dst[i + 1*stride] + ((z1 + z2) >> 6)); | |
62 | dst[i + 2*stride]= av_clip_pixel(dst[i + 2*stride] + ((z1 - z2) >> 6)); | |
63 | dst[i + 3*stride]= av_clip_pixel(dst[i + 3*stride] + ((z0 - z3) >> 6)); | |
64 | } | |
65 | ||
66 | memset(block, 0, 16 * sizeof(dctcoef)); | |
67 | } | |
68 | ||
69 | void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, int16_t *_block, int stride){ | |
70 | int i; | |
71 | pixel *dst = (pixel*)_dst; | |
72 | dctcoef *block = (dctcoef*)_block; | |
73 | stride >>= sizeof(pixel)-1; | |
74 | ||
75 | block[0] += 32; | |
76 | ||
77 | for( i = 0; i < 8; i++ ) | |
78 | { | |
79 | const int a0 = block[i+0*8] + block[i+4*8]; | |
80 | const int a2 = block[i+0*8] - block[i+4*8]; | |
81 | const int a4 = (block[i+2*8]>>1) - block[i+6*8]; | |
82 | const int a6 = (block[i+6*8]>>1) + block[i+2*8]; | |
83 | ||
84 | const int b0 = a0 + a6; | |
85 | const int b2 = a2 + a4; | |
86 | const int b4 = a2 - a4; | |
87 | const int b6 = a0 - a6; | |
88 | ||
89 | const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1); | |
90 | const int a3 = block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1); | |
91 | const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1); | |
92 | const int a7 = block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1); | |
93 | ||
94 | const int b1 = (a7>>2) + a1; | |
95 | const int b3 = a3 + (a5>>2); | |
96 | const int b5 = (a3>>2) - a5; | |
97 | const int b7 = a7 - (a1>>2); | |
98 | ||
99 | block[i+0*8] = b0 + b7; | |
100 | block[i+7*8] = b0 - b7; | |
101 | block[i+1*8] = b2 + b5; | |
102 | block[i+6*8] = b2 - b5; | |
103 | block[i+2*8] = b4 + b3; | |
104 | block[i+5*8] = b4 - b3; | |
105 | block[i+3*8] = b6 + b1; | |
106 | block[i+4*8] = b6 - b1; | |
107 | } | |
108 | for( i = 0; i < 8; i++ ) | |
109 | { | |
110 | const int a0 = block[0+i*8] + block[4+i*8]; | |
111 | const int a2 = block[0+i*8] - block[4+i*8]; | |
112 | const int a4 = (block[2+i*8]>>1) - block[6+i*8]; | |
113 | const int a6 = (block[6+i*8]>>1) + block[2+i*8]; | |
114 | ||
115 | const int b0 = a0 + a6; | |
116 | const int b2 = a2 + a4; | |
117 | const int b4 = a2 - a4; | |
118 | const int b6 = a0 - a6; | |
119 | ||
120 | const int a1 = -block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1); | |
121 | const int a3 = block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1); | |
122 | const int a5 = -block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1); | |
123 | const int a7 = block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1); | |
124 | ||
125 | const int b1 = (a7>>2) + a1; | |
126 | const int b3 = a3 + (a5>>2); | |
127 | const int b5 = (a3>>2) - a5; | |
128 | const int b7 = a7 - (a1>>2); | |
129 | ||
130 | dst[i + 0*stride] = av_clip_pixel( dst[i + 0*stride] + ((b0 + b7) >> 6) ); | |
131 | dst[i + 1*stride] = av_clip_pixel( dst[i + 1*stride] + ((b2 + b5) >> 6) ); | |
132 | dst[i + 2*stride] = av_clip_pixel( dst[i + 2*stride] + ((b4 + b3) >> 6) ); | |
133 | dst[i + 3*stride] = av_clip_pixel( dst[i + 3*stride] + ((b6 + b1) >> 6) ); | |
134 | dst[i + 4*stride] = av_clip_pixel( dst[i + 4*stride] + ((b6 - b1) >> 6) ); | |
135 | dst[i + 5*stride] = av_clip_pixel( dst[i + 5*stride] + ((b4 - b3) >> 6) ); | |
136 | dst[i + 6*stride] = av_clip_pixel( dst[i + 6*stride] + ((b2 - b5) >> 6) ); | |
137 | dst[i + 7*stride] = av_clip_pixel( dst[i + 7*stride] + ((b0 - b7) >> 6) ); | |
138 | } | |
139 | ||
140 | memset(block, 0, 64 * sizeof(dctcoef)); | |
141 | } | |
142 | ||
143 | // assumes all AC coefs are 0 | |
144 | void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, int16_t *_block, int stride){ | |
145 | int i, j; | |
146 | pixel *dst = (pixel*)_dst; | |
147 | dctcoef *block = (dctcoef*)_block; | |
148 | int dc = (block[0] + 32) >> 6; | |
149 | stride /= sizeof(pixel); | |
150 | block[0] = 0; | |
151 | for( j = 0; j < 4; j++ ) | |
152 | { | |
153 | for( i = 0; i < 4; i++ ) | |
154 | dst[i] = av_clip_pixel( dst[i] + dc ); | |
155 | dst += stride; | |
156 | } | |
157 | } | |
158 | ||
159 | void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, int16_t *_block, int stride){ | |
160 | int i, j; | |
161 | pixel *dst = (pixel*)_dst; | |
162 | dctcoef *block = (dctcoef*)_block; | |
163 | int dc = (block[0] + 32) >> 6; | |
164 | block[0] = 0; | |
165 | stride /= sizeof(pixel); | |
166 | for( j = 0; j < 8; j++ ) | |
167 | { | |
168 | for( i = 0; i < 8; i++ ) | |
169 | dst[i] = av_clip_pixel( dst[i] + dc ); | |
170 | dst += stride; | |
171 | } | |
172 | } | |
173 | ||
174 | void FUNCC(ff_h264_idct_add16)(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){ | |
175 | int i; | |
176 | for(i=0; i<16; i++){ | |
177 | int nnz = nnzc[ scan8[i] ]; | |
178 | if(nnz){ | |
179 | if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); | |
180 | else FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); | |
181 | } | |
182 | } | |
183 | } | |
184 | ||
185 | void FUNCC(ff_h264_idct_add16intra)(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){ | |
186 | int i; | |
187 | for(i=0; i<16; i++){ | |
188 | if(nnzc[ scan8[i] ]) FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); | |
189 | else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); | |
190 | } | |
191 | } | |
192 | ||
193 | void FUNCC(ff_h264_idct8_add4)(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){ | |
194 | int i; | |
195 | for(i=0; i<16; i+=4){ | |
196 | int nnz = nnzc[ scan8[i] ]; | |
197 | if(nnz){ | |
198 | if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct8_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); | |
199 | else FUNCC(ff_h264_idct8_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); | |
200 | } | |
201 | } | |
202 | } | |
203 | ||
204 | void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){ | |
205 | int i, j; | |
206 | for(j=1; j<3; j++){ | |
207 | for(i=j*16; i<j*16+4; i++){ | |
208 | if(nnzc[ scan8[i] ]) | |
209 | FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); | |
210 | else if(((dctcoef*)block)[i*16]) | |
211 | FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); | |
212 | } | |
213 | } | |
214 | } | |
215 | ||
216 | 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]){ | |
217 | int i, j; | |
218 | ||
219 | for(j=1; j<3; j++){ | |
220 | for(i=j*16; i<j*16+4; i++){ | |
221 | if(nnzc[ scan8[i] ]) | |
222 | FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); | |
223 | else if(((dctcoef*)block)[i*16]) | |
224 | FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); | |
225 | } | |
226 | } | |
227 | ||
228 | for(j=1; j<3; j++){ | |
229 | for(i=j*16+4; i<j*16+8; i++){ | |
230 | if(nnzc[ scan8[i+4] ]) | |
231 | FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride); | |
232 | else if(((dctcoef*)block)[i*16]) | |
233 | FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride); | |
234 | } | |
235 | } | |
236 | } | |
237 | ||
238 | /** | |
239 | * IDCT transforms the 16 dc values and dequantizes them. | |
240 | * @param qmul quantization parameter | |
241 | */ | |
242 | void FUNCC(ff_h264_luma_dc_dequant_idct)(int16_t *_output, int16_t *_input, int qmul){ | |
243 | #define stride 16 | |
244 | int i; | |
245 | int temp[16]; | |
246 | static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride}; | |
247 | dctcoef *input = (dctcoef*)_input; | |
248 | dctcoef *output = (dctcoef*)_output; | |
249 | ||
250 | for(i=0; i<4; i++){ | |
251 | const int z0= input[4*i+0] + input[4*i+1]; | |
252 | const int z1= input[4*i+0] - input[4*i+1]; | |
253 | const int z2= input[4*i+2] - input[4*i+3]; | |
254 | const int z3= input[4*i+2] + input[4*i+3]; | |
255 | ||
256 | temp[4*i+0]= z0+z3; | |
257 | temp[4*i+1]= z0-z3; | |
258 | temp[4*i+2]= z1-z2; | |
259 | temp[4*i+3]= z1+z2; | |
260 | } | |
261 | ||
262 | for(i=0; i<4; i++){ | |
263 | const int offset= x_offset[i]; | |
264 | const int z0= temp[4*0+i] + temp[4*2+i]; | |
265 | const int z1= temp[4*0+i] - temp[4*2+i]; | |
266 | const int z2= temp[4*1+i] - temp[4*3+i]; | |
267 | const int z3= temp[4*1+i] + temp[4*3+i]; | |
268 | ||
269 | output[stride* 0+offset]= ((((z0 + z3)*qmul + 128 ) >> 8)); | |
270 | output[stride* 1+offset]= ((((z1 + z2)*qmul + 128 ) >> 8)); | |
271 | output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8)); | |
272 | output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8)); | |
273 | } | |
274 | #undef stride | |
275 | } | |
276 | ||
277 | void FUNCC(ff_h264_chroma422_dc_dequant_idct)(int16_t *_block, int qmul){ | |
278 | const int stride= 16*2; | |
279 | const int xStride= 16; | |
280 | int i; | |
281 | int temp[8]; | |
282 | static const uint8_t x_offset[2]={0, 16}; | |
283 | dctcoef *block = (dctcoef*)_block; | |
284 | ||
285 | for(i=0; i<4; i++){ | |
286 | temp[2*i+0] = block[stride*i + xStride*0] + block[stride*i + xStride*1]; | |
287 | temp[2*i+1] = block[stride*i + xStride*0] - block[stride*i + xStride*1]; | |
288 | } | |
289 | ||
290 | for(i=0; i<2; i++){ | |
291 | const int offset= x_offset[i]; | |
292 | const int z0= temp[2*0+i] + temp[2*2+i]; | |
293 | const int z1= temp[2*0+i] - temp[2*2+i]; | |
294 | const int z2= temp[2*1+i] - temp[2*3+i]; | |
295 | const int z3= temp[2*1+i] + temp[2*3+i]; | |
296 | ||
297 | block[stride*0+offset]= ((z0 + z3)*qmul + 128) >> 8; | |
298 | block[stride*1+offset]= ((z1 + z2)*qmul + 128) >> 8; | |
299 | block[stride*2+offset]= ((z1 - z2)*qmul + 128) >> 8; | |
300 | block[stride*3+offset]= ((z0 - z3)*qmul + 128) >> 8; | |
301 | } | |
302 | } | |
303 | ||
304 | void FUNCC(ff_h264_chroma_dc_dequant_idct)(int16_t *_block, int qmul){ | |
305 | const int stride= 16*2; | |
306 | const int xStride= 16; | |
307 | int a,b,c,d,e; | |
308 | dctcoef *block = (dctcoef*)_block; | |
309 | ||
310 | a= block[stride*0 + xStride*0]; | |
311 | b= block[stride*0 + xStride*1]; | |
312 | c= block[stride*1 + xStride*0]; | |
313 | d= block[stride*1 + xStride*1]; | |
314 | ||
315 | e= a-b; | |
316 | a= a+b; | |
317 | b= c-d; | |
318 | c= c+d; | |
319 | ||
320 | block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7; | |
321 | block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7; | |
322 | block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7; | |
323 | block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7; | |
324 | } |