Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / h264idct_template.c
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 }