blob: e1ef68756c7dee29f7d968a542426fd851f7a9cb
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 "h264dec.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 SUINT z0= block[i + 4*0] + block[i + 4*2]; |
44 | const SUINT z1= block[i + 4*0] - block[i + 4*2]; |
45 | const SUINT z2= (block[i + 4*1]>>1) - block[i + 4*3]; |
46 | const SUINT 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 SUINT z0= block[0 + 4*i] + (SUINT)block[2 + 4*i]; |
56 | const SUINT z1= block[0 + 4*i] - (SUINT)block[2 + 4*i]; |
57 | const SUINT z2= (block[1 + 4*i]>>1) - (SUINT)block[3 + 4*i]; |
58 | const SUINT z3= block[1 + 4*i] + (SUINT)(block[3 + 4*i]>>1); |
59 | |
60 | dst[i + 0*stride]= av_clip_pixel(dst[i + 0*stride] + ((int)(z0 + z3) >> 6)); |
61 | dst[i + 1*stride]= av_clip_pixel(dst[i + 1*stride] + ((int)(z1 + z2) >> 6)); |
62 | dst[i + 2*stride]= av_clip_pixel(dst[i + 2*stride] + ((int)(z1 - z2) >> 6)); |
63 | dst[i + 3*stride]= av_clip_pixel(dst[i + 3*stride] + ((int)(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 unsigned a0 = block[0+i*8] + block[4+i*8]; |
111 | const unsigned a2 = block[0+i*8] - block[4+i*8]; |
112 | const unsigned a4 = (block[2+i*8]>>1) - block[6+i*8]; |
113 | const unsigned a6 = (block[6+i*8]>>1) + block[2+i*8]; |
114 | |
115 | const unsigned b0 = a0 + a6; |
116 | const unsigned b2 = a2 + a4; |
117 | const unsigned b4 = a2 - a4; |
118 | const unsigned b6 = a0 - a6; |
119 | |
120 | const int a1 = -(unsigned)block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1); |
121 | const int a3 = (unsigned)block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1); |
122 | const int a5 = -(unsigned)block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1); |
123 | const int a7 = (unsigned)block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1); |
124 | |
125 | const unsigned b1 = (a7>>2) + (unsigned)a1; |
126 | const unsigned b3 = (unsigned)a3 + (a5>>2); |
127 | const unsigned b5 = (a3>>2) - (unsigned)a5; |
128 | const unsigned b7 = (unsigned)a7 - (a1>>2); |
129 | |
130 | dst[i + 0*stride] = av_clip_pixel( dst[i + 0*stride] + ((int)(b0 + b7) >> 6) ); |
131 | dst[i + 1*stride] = av_clip_pixel( dst[i + 1*stride] + ((int)(b2 + b5) >> 6) ); |
132 | dst[i + 2*stride] = av_clip_pixel( dst[i + 2*stride] + ((int)(b4 + b3) >> 6) ); |
133 | dst[i + 3*stride] = av_clip_pixel( dst[i + 3*stride] + ((int)(b6 + b1) >> 6) ); |
134 | dst[i + 4*stride] = av_clip_pixel( dst[i + 4*stride] + ((int)(b6 - b1) >> 6) ); |
135 | dst[i + 5*stride] = av_clip_pixel( dst[i + 5*stride] + ((int)(b4 - b3) >> 6) ); |
136 | dst[i + 6*stride] = av_clip_pixel( dst[i + 6*stride] + ((int)(b2 - b5) >> 6) ); |
137 | dst[i + 7*stride] = av_clip_pixel( dst[i + 7*stride] + ((int)(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 SUINT z0= temp[4*0+i] + temp[4*2+i]; |
265 | const SUINT z1= temp[4*0+i] - temp[4*2+i]; |
266 | const SUINT z2= temp[4*1+i] - temp[4*3+i]; |
267 | const SUINT z3= temp[4*1+i] + temp[4*3+i]; |
268 | |
269 | output[stride* 0+offset]= (int)((z0 + z3)*qmul + 128 ) >> 8; |
270 | output[stride* 1+offset]= (int)((z1 + z2)*qmul + 128 ) >> 8; |
271 | output[stride* 4+offset]= (int)((z1 - z2)*qmul + 128 ) >> 8; |
272 | output[stride* 5+offset]= (int)((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 SUINT z0= temp[2*0+i] + temp[2*2+i]; |
293 | const SUINT z1= temp[2*0+i] - temp[2*2+i]; |
294 | const SUINT z2= temp[2*1+i] - temp[2*3+i]; |
295 | const SUINT z3= temp[2*1+i] + temp[2*3+i]; |
296 | |
297 | block[stride*0+offset]= (int)((z0 + z3)*qmul + 128) >> 8; |
298 | block[stride*1+offset]= (int)((z1 + z2)*qmul + 128) >> 8; |
299 | block[stride*2+offset]= (int)((z1 - z2)*qmul + 128) >> 8; |
300 | block[stride*3+offset]= (int)((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 | SUINT 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]= (int)((a+c)*qmul) >> 7; |
321 | block[stride*0 + xStride*1]= (int)((e+b)*qmul) >> 7; |
322 | block[stride*1 + xStride*0]= (int)((a-c)*qmul) >> 7; |
323 | block[stride*1 + xStride*1]= (int)((e-b)*qmul) >> 7; |
324 | } |
325 |