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dsputil: remove huge #if 0 block
[libav.git] / libavcodec / simple_idct_template.c
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e7a972e1
MR		 1/*
2 * Simple IDCT
3 *
4 * Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file
25 * simpleidct in C.
26 */
27
28/*
29 based upon some outcommented c code from mpeg2dec (idct_mmx.c
30 written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>)
31 */
32
33#include "bit_depth_template.c"
34
35#undef W1
36#undef W2
37#undef W3
38#undef W4
39#undef W5
40#undef W6
41#undef W7
42#undef ROW_SHIFT
43#undef COL_SHIFT
44#undef DC_SHIFT
45#undef MUL
46#undef MAC
47
48#if BIT_DEPTH == 8
49
50#define W1 22725 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
51#define W2 21407 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
52#define W3 19266 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
53#define W4 16383 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
54#define W5 12873 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
55#define W6 8867 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
56#define W7 4520 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
57
58#define ROW_SHIFT 11
59#define COL_SHIFT 20
60#define DC_SHIFT 3
61
62#define MUL(a, b) MUL16(a, b)
63#define MAC(a, b, c) MAC16(a, b, c)
64
65#elif BIT_DEPTH == 10
66
67#define W1 90901
68#define W2 85627
69#define W3 77062
70#define W4 65535
71#define W5 51491
72#define W6 35468
73#define W7 18081
74
75#define ROW_SHIFT 15
76#define COL_SHIFT 20
77#define DC_SHIFT 1
78
79#define MUL(a, b) ((a) * (b))
80#define MAC(a, b, c) ((a) += (b) * (c))
81
82#else
83
84#error "Unsupported bitdepth"
85
86#endif
87
88static inline void FUNC(idctRowCondDC)(DCTELEM *row)
89{
90 int a0, a1, a2, a3, b0, b1, b2, b3;
91
92#if HAVE_FAST_64BIT
93#define ROW0_MASK (0xffffLL << 48 * HAVE_BIGENDIAN)
94 if (((((uint64_t *)row)[0] & ~ROW0_MASK) | ((uint64_t *)row)[1]) == 0) {
95 uint64_t temp = (row[0] << DC_SHIFT) & 0xffff;
96 temp += temp << 16;
97 temp += temp << 32;
98 ((uint64_t *)row)[0] = temp;
99 ((uint64_t *)row)[1] = temp;
100 return;
101 }
102#else
103 if (!(((uint32_t*)row)[1] |
104 ((uint32_t*)row)[2] |
105 ((uint32_t*)row)[3] |
106 row[1])) {
107 uint32_t temp = (row[0] << DC_SHIFT) & 0xffff;
108 temp += temp << 16;
109 ((uint32_t*)row)[0]=((uint32_t*)row)[1] =
110 ((uint32_t*)row)[2]=((uint32_t*)row)[3] = temp;
111 return;
112 }
113#endif
114
115 a0 = (W4 * row[0]) + (1 << (ROW_SHIFT - 1));
116 a1 = a0;
117 a2 = a0;
118 a3 = a0;
119
120 /* no need to optimize : gcc does it */
121 a0 += W2 * row[2];
122 a1 += W6 * row[2];
123 a2 -= W6 * row[2];
124 a3 -= W2 * row[2];
125
126 b0 = MUL(W1, row[1]);
127 MAC(b0, W3, row[3]);
128 b1 = MUL(W3, row[1]);
129 MAC(b1, -W7, row[3]);
130 b2 = MUL(W5, row[1]);
131 MAC(b2, -W1, row[3]);
132 b3 = MUL(W7, row[1]);
133 MAC(b3, -W5, row[3]);
134
135 if (AV_RN64A(row + 4)) {
136 a0 += W4*row[4] + W6*row[6];
137 a1 += - W4*row[4] - W2*row[6];
138 a2 += - W4*row[4] + W2*row[6];
139 a3 += W4*row[4] - W6*row[6];
140
141 MAC(b0, W5, row[5]);
142 MAC(b0, W7, row[7]);
143
144 MAC(b1, -W1, row[5]);
145 MAC(b1, -W5, row[7]);
146
147 MAC(b2, W7, row[5]);
148 MAC(b2, W3, row[7]);
149
150 MAC(b3, W3, row[5]);
151 MAC(b3, -W1, row[7]);
152 }
153
154 row[0] = (a0 + b0) >> ROW_SHIFT;
155 row[7] = (a0 - b0) >> ROW_SHIFT;
156 row[1] = (a1 + b1) >> ROW_SHIFT;
157 row[6] = (a1 - b1) >> ROW_SHIFT;
158 row[2] = (a2 + b2) >> ROW_SHIFT;
159 row[5] = (a2 - b2) >> ROW_SHIFT;
160 row[3] = (a3 + b3) >> ROW_SHIFT;
161 row[4] = (a3 - b3) >> ROW_SHIFT;
162}
163
164static inline void FUNC(idctSparseColPut)(pixel *dest, int line_size,
165 DCTELEM *col)
166{
167 int a0, a1, a2, a3, b0, b1, b2, b3;
168 INIT_CLIP;
169
170 /* XXX: I did that only to give same values as previous code */
171 a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4));
172 a1 = a0;
173 a2 = a0;
174 a3 = a0;
175
176 a0 += + W2*col[8*2];
177 a1 += + W6*col[8*2];
178 a2 += - W6*col[8*2];
179 a3 += - W2*col[8*2];
180
181 b0 = MUL(W1, col[8*1]);
182 b1 = MUL(W3, col[8*1]);
183 b2 = MUL(W5, col[8*1]);
184 b3 = MUL(W7, col[8*1]);
185
186 MAC(b0, + W3, col[8*3]);
187 MAC(b1, - W7, col[8*3]);
188 MAC(b2, - W1, col[8*3]);
189 MAC(b3, - W5, col[8*3]);
190
191 if(col[8*4]){
192 a0 += + W4*col[8*4];
193 a1 += - W4*col[8*4];
194 a2 += - W4*col[8*4];
195 a3 += + W4*col[8*4];
196 }
197
198 if (col[8*5]) {
199 MAC(b0, + W5, col[8*5]);
200 MAC(b1, - W1, col[8*5]);
201 MAC(b2, + W7, col[8*5]);
202 MAC(b3, + W3, col[8*5]);
203 }
204
205 if(col[8*6]){
206 a0 += + W6*col[8*6];
207 a1 += - W2*col[8*6];
208 a2 += + W2*col[8*6];
209 a3 += - W6*col[8*6];
210 }
211
212 if (col[8*7]) {
213 MAC(b0, + W7, col[8*7]);
214 MAC(b1, - W5, col[8*7]);
215 MAC(b2, + W3, col[8*7]);
216 MAC(b3, - W1, col[8*7]);
217 }
218
219 dest[0] = CLIP((a0 + b0) >> COL_SHIFT);
220 dest += line_size;
221 dest[0] = CLIP((a1 + b1) >> COL_SHIFT);
222 dest += line_size;
223 dest[0] = CLIP((a2 + b2) >> COL_SHIFT);
224 dest += line_size;
225 dest[0] = CLIP((a3 + b3) >> COL_SHIFT);
226 dest += line_size;
227 dest[0] = CLIP((a3 - b3) >> COL_SHIFT);
228 dest += line_size;
229 dest[0] = CLIP((a2 - b2) >> COL_SHIFT);
230 dest += line_size;
231 dest[0] = CLIP((a1 - b1) >> COL_SHIFT);
232 dest += line_size;
233 dest[0] = CLIP((a0 - b0) >> COL_SHIFT);
234}
235
236static inline void FUNC(idctSparseColAdd)(pixel *dest, int line_size,
237 DCTELEM *col)
238{
239 int a0, a1, a2, a3, b0, b1, b2, b3;
240 INIT_CLIP;
241
242 /* XXX: I did that only to give same values as previous code */
243 a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4));
244 a1 = a0;
245 a2 = a0;
246 a3 = a0;
247
248 a0 += + W2*col[8*2];
249 a1 += + W6*col[8*2];
250 a2 += - W6*col[8*2];
251 a3 += - W2*col[8*2];
252
253 b0 = MUL(W1, col[8*1]);
254 b1 = MUL(W3, col[8*1]);
255 b2 = MUL(W5, col[8*1]);
256 b3 = MUL(W7, col[8*1]);
257
258 MAC(b0, + W3, col[8*3]);
259 MAC(b1, - W7, col[8*3]);
260 MAC(b2, - W1, col[8*3]);
261 MAC(b3, - W5, col[8*3]);
262
263 if(col[8*4]){
264 a0 += + W4*col[8*4];
265 a1 += - W4*col[8*4];
266 a2 += - W4*col[8*4];
267 a3 += + W4*col[8*4];
268 }
269
270 if (col[8*5]) {
271 MAC(b0, + W5, col[8*5]);
272 MAC(b1, - W1, col[8*5]);
273 MAC(b2, + W7, col[8*5]);
274 MAC(b3, + W3, col[8*5]);
275 }
276
277 if(col[8*6]){
278 a0 += + W6*col[8*6];
279 a1 += - W2*col[8*6];
280 a2 += + W2*col[8*6];
281 a3 += - W6*col[8*6];
282 }
283
284 if (col[8*7]) {
285 MAC(b0, + W7, col[8*7]);
286 MAC(b1, - W5, col[8*7]);
287 MAC(b2, + W3, col[8*7]);
288 MAC(b3, - W1, col[8*7]);
289 }
290
291 dest[0] = CLIP(dest[0] + ((a0 + b0) >> COL_SHIFT));
292 dest += line_size;
293 dest[0] = CLIP(dest[0] + ((a1 + b1) >> COL_SHIFT));
294 dest += line_size;
295 dest[0] = CLIP(dest[0] + ((a2 + b2) >> COL_SHIFT));
296 dest += line_size;
297 dest[0] = CLIP(dest[0] + ((a3 + b3) >> COL_SHIFT));
298 dest += line_size;
299 dest[0] = CLIP(dest[0] + ((a3 - b3) >> COL_SHIFT));
300 dest += line_size;
301 dest[0] = CLIP(dest[0] + ((a2 - b2) >> COL_SHIFT));
302 dest += line_size;
303 dest[0] = CLIP(dest[0] + ((a1 - b1) >> COL_SHIFT));
304 dest += line_size;
305 dest[0] = CLIP(dest[0] + ((a0 - b0) >> COL_SHIFT));
306}
307
308static inline void FUNC(idctSparseCol)(DCTELEM *col)
309{
310 int a0, a1, a2, a3, b0, b1, b2, b3;
311
312 /* XXX: I did that only to give same values as previous code */
313 a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4));
314 a1 = a0;
315 a2 = a0;
316 a3 = a0;
317
318 a0 += + W2*col[8*2];
319 a1 += + W6*col[8*2];
320 a2 += - W6*col[8*2];
321 a3 += - W2*col[8*2];
322
323 b0 = MUL(W1, col[8*1]);
324 b1 = MUL(W3, col[8*1]);
325 b2 = MUL(W5, col[8*1]);
326 b3 = MUL(W7, col[8*1]);
327
328 MAC(b0, + W3, col[8*3]);
329 MAC(b1, - W7, col[8*3]);
330 MAC(b2, - W1, col[8*3]);
331 MAC(b3, - W5, col[8*3]);
332
333 if(col[8*4]){
334 a0 += + W4*col[8*4];
335 a1 += - W4*col[8*4];
336 a2 += - W4*col[8*4];
337 a3 += + W4*col[8*4];
338 }
339
340 if (col[8*5]) {
341 MAC(b0, + W5, col[8*5]);
342 MAC(b1, - W1, col[8*5]);
343 MAC(b2, + W7, col[8*5]);
344 MAC(b3, + W3, col[8*5]);
345 }
346
347 if(col[8*6]){
348 a0 += + W6*col[8*6];
349 a1 += - W2*col[8*6];
350 a2 += + W2*col[8*6];
351 a3 += - W6*col[8*6];
352 }
353
354 if (col[8*7]) {
355 MAC(b0, + W7, col[8*7]);
356 MAC(b1, - W5, col[8*7]);
357 MAC(b2, + W3, col[8*7]);
358 MAC(b3, - W1, col[8*7]);
359 }
360
361 col[0 ] = ((a0 + b0) >> COL_SHIFT);
362 col[8 ] = ((a1 + b1) >> COL_SHIFT);
363 col[16] = ((a2 + b2) >> COL_SHIFT);
364 col[24] = ((a3 + b3) >> COL_SHIFT);
365 col[32] = ((a3 - b3) >> COL_SHIFT);
366 col[40] = ((a2 - b2) >> COL_SHIFT);
367 col[48] = ((a1 - b1) >> COL_SHIFT);
368 col[56] = ((a0 - b0) >> COL_SHIFT);
369}
370
371void FUNC(ff_simple_idct_put)(uint8_t *dest_, int line_size, DCTELEM *block)
372{
373 pixel *dest = (pixel *)dest_;
374 int i;
e7bcc5ba
MR		 375
376 line_size /= sizeof(pixel);
377
e7a972e1
MR		 378 for(i=0; i<8; i++)
379 FUNC(idctRowCondDC)(block + i*8);
380
381 for(i=0; i<8; i++)
382 FUNC(idctSparseColPut)(dest + i, line_size, block + i);
383}
384
385void FUNC(ff_simple_idct_add)(uint8_t *dest_, int line_size, DCTELEM *block)
386{
387 pixel *dest = (pixel *)dest_;
388 int i;
e7bcc5ba
MR		 389
390 line_size /= sizeof(pixel);
391
e7a972e1
MR		 392 for(i=0; i<8; i++)
393 FUNC(idctRowCondDC)(block + i*8);
394
395 for(i=0; i<8; i++)
396 FUNC(idctSparseColAdd)(dest + i, line_size, block + i);
397}
398
399void FUNC(ff_simple_idct)(DCTELEM *block)
400{
401 int i;
402 for(i=0; i<8; i++)
403 FUNC(idctRowCondDC)(block + i*8);
404
405 for(i=0; i<8; i++)
406 FUNC(idctSparseCol)(block + i);
407}
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