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[deb_ffmpeg.git] / fdctdsp.c
1 /*
2 * Copyright (C) 2003 James Klicman <james@klicman.org>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "config.h"
22 #if HAVE_ALTIVEC_H
23 #include <altivec.h>
24 #endif
25
26 #include "libavutil/attributes.h"
27 #include "libavutil/cpu.h"
28 #include "libavutil/ppc/cpu.h"
29 #include "libavcodec/fdctdsp.h"
30 #include "fdct.h"
31
32 #if HAVE_ALTIVEC
33
34 #define vs16(v) ((vector signed short) (v))
35 #define vs32(v) ((vector signed int) (v))
36 #define vu8(v) ((vector unsigned char) (v))
37 #define vu16(v) ((vector unsigned short) (v))
38 #define vu32(v) ((vector unsigned int) (v))
39
40 #define C1 0.98078525066375732421875000 /* cos(1 * PI / 16) */
41 #define C2 0.92387950420379638671875000 /* cos(2 * PI / 16) */
42 #define C3 0.83146959543228149414062500 /* cos(3 * PI / 16) */
43 #define C4 0.70710676908493041992187500 /* cos(4 * PI / 16) */
44 #define C5 0.55557024478912353515625000 /* cos(5 * PI / 16) */
45 #define C6 0.38268342614173889160156250 /* cos(6 * PI / 16) */
46 #define C7 0.19509032368659973144531250 /* cos(7 * PI / 16) */
47 #define SQRT_2 1.41421353816986083984375000 /* sqrt(2) */
48
49 #define W0 -(2 * C2)
50 #define W1 (2 * C6)
51 #define W2 (SQRT_2 * C6)
52 #define W3 (SQRT_2 * C3)
53 #define W4 (SQRT_2 * (-C1 + C3 + C5 - C7))
54 #define W5 (SQRT_2 * (C1 + C3 - C5 + C7))
55 #define W6 (SQRT_2 * (C1 + C3 + C5 - C7))
56 #define W7 (SQRT_2 * (C1 + C3 - C5 - C7))
57 #define W8 (SQRT_2 * (C7 - C3))
58 #define W9 (SQRT_2 * (-C1 - C3))
59 #define WA (SQRT_2 * (-C3 - C5))
60 #define WB (SQRT_2 * (C5 - C3))
61
62 static const vector float fdctconsts[3] = {
63 { W0, W1, W2, W3 },
64 { W4, W5, W6, W7 },
65 { W8, W9, WA, WB }
66 };
67
68 #define LD_W0 vec_splat(cnsts0, 0)
69 #define LD_W1 vec_splat(cnsts0, 1)
70 #define LD_W2 vec_splat(cnsts0, 2)
71 #define LD_W3 vec_splat(cnsts0, 3)
72 #define LD_W4 vec_splat(cnsts1, 0)
73 #define LD_W5 vec_splat(cnsts1, 1)
74 #define LD_W6 vec_splat(cnsts1, 2)
75 #define LD_W7 vec_splat(cnsts1, 3)
76 #define LD_W8 vec_splat(cnsts2, 0)
77 #define LD_W9 vec_splat(cnsts2, 1)
78 #define LD_WA vec_splat(cnsts2, 2)
79 #define LD_WB vec_splat(cnsts2, 3)
80
81 #define FDCTROW(b0, b1, b2, b3, b4, b5, b6, b7) /* {{{ */ \
82 x0 = vec_add(b0, b7); /* x0 = b0 + b7; */ \
83 x7 = vec_sub(b0, b7); /* x7 = b0 - b7; */ \
84 x1 = vec_add(b1, b6); /* x1 = b1 + b6; */ \
85 x6 = vec_sub(b1, b6); /* x6 = b1 - b6; */ \
86 x2 = vec_add(b2, b5); /* x2 = b2 + b5; */ \
87 x5 = vec_sub(b2, b5); /* x5 = b2 - b5; */ \
88 x3 = vec_add(b3, b4); /* x3 = b3 + b4; */ \
89 x4 = vec_sub(b3, b4); /* x4 = b3 - b4; */ \
90 \
91 b7 = vec_add(x0, x3); /* b7 = x0 + x3; */ \
92 b1 = vec_add(x1, x2); /* b1 = x1 + x2; */ \
93 b0 = vec_add(b7, b1); /* b0 = b7 + b1; */ \
94 b4 = vec_sub(b7, b1); /* b4 = b7 - b1; */ \
95 \
96 b2 = vec_sub(x0, x3); /* b2 = x0 - x3; */ \
97 b6 = vec_sub(x1, x2); /* b6 = x1 - x2; */ \
98 b5 = vec_add(b6, b2); /* b5 = b6 + b2; */ \
99 cnst = LD_W2; \
100 b5 = vec_madd(cnst, b5, mzero); /* b5 = b5 * W2; */ \
101 cnst = LD_W1; \
102 b2 = vec_madd(cnst, b2, b5); /* b2 = b5 + b2 * W1; */ \
103 cnst = LD_W0; \
104 b6 = vec_madd(cnst, b6, b5); /* b6 = b5 + b6 * W0; */ \
105 \
106 x0 = vec_add(x4, x7); /* x0 = x4 + x7; */ \
107 x1 = vec_add(x5, x6); /* x1 = x5 + x6; */ \
108 x2 = vec_add(x4, x6); /* x2 = x4 + x6; */ \
109 x3 = vec_add(x5, x7); /* x3 = x5 + x7; */ \
110 x8 = vec_add(x2, x3); /* x8 = x2 + x3; */ \
111 cnst = LD_W3; \
112 x8 = vec_madd(cnst, x8, mzero); /* x8 = x8 * W3; */ \
113 \
114 cnst = LD_W8; \
115 x0 = vec_madd(cnst, x0, mzero); /* x0 *= W8; */ \
116 cnst = LD_W9; \
117 x1 = vec_madd(cnst, x1, mzero); /* x1 *= W9; */ \
118 cnst = LD_WA; \
119 x2 = vec_madd(cnst, x2, x8); /* x2 = x2 * WA + x8; */ \
120 cnst = LD_WB; \
121 x3 = vec_madd(cnst, x3, x8); /* x3 = x3 * WB + x8; */ \
122 \
123 cnst = LD_W4; \
124 b7 = vec_madd(cnst, x4, x0); /* b7 = x4 * W4 + x0; */ \
125 cnst = LD_W5; \
126 b5 = vec_madd(cnst, x5, x1); /* b5 = x5 * W5 + x1; */ \
127 cnst = LD_W6; \
128 b3 = vec_madd(cnst, x6, x1); /* b3 = x6 * W6 + x1; */ \
129 cnst = LD_W7; \
130 b1 = vec_madd(cnst, x7, x0); /* b1 = x7 * W7 + x0; */ \
131 \
132 b7 = vec_add(b7, x2); /* b7 = b7 + x2; */ \
133 b5 = vec_add(b5, x3); /* b5 = b5 + x3; */ \
134 b3 = vec_add(b3, x2); /* b3 = b3 + x2; */ \
135 b1 = vec_add(b1, x3) /* b1 = b1 + x3; */ \
136 /* }}} */
137
138 #define FDCTCOL(b0, b1, b2, b3, b4, b5, b6, b7) /* {{{ */ \
139 x0 = vec_add(b0, b7); /* x0 = b0 + b7; */ \
140 x7 = vec_sub(b0, b7); /* x7 = b0 - b7; */ \
141 x1 = vec_add(b1, b6); /* x1 = b1 + b6; */ \
142 x6 = vec_sub(b1, b6); /* x6 = b1 - b6; */ \
143 x2 = vec_add(b2, b5); /* x2 = b2 + b5; */ \
144 x5 = vec_sub(b2, b5); /* x5 = b2 - b5; */ \
145 x3 = vec_add(b3, b4); /* x3 = b3 + b4; */ \
146 x4 = vec_sub(b3, b4); /* x4 = b3 - b4; */ \
147 \
148 b7 = vec_add(x0, x3); /* b7 = x0 + x3; */ \
149 b1 = vec_add(x1, x2); /* b1 = x1 + x2; */ \
150 b0 = vec_add(b7, b1); /* b0 = b7 + b1; */ \
151 b4 = vec_sub(b7, b1); /* b4 = b7 - b1; */ \
152 \
153 b2 = vec_sub(x0, x3); /* b2 = x0 - x3; */ \
154 b6 = vec_sub(x1, x2); /* b6 = x1 - x2; */ \
155 b5 = vec_add(b6, b2); /* b5 = b6 + b2; */ \
156 cnst = LD_W2; \
157 b5 = vec_madd(cnst, b5, mzero); /* b5 = b5 * W2; */ \
158 cnst = LD_W1; \
159 b2 = vec_madd(cnst, b2, b5); /* b2 = b5 + b2 * W1; */ \
160 cnst = LD_W0; \
161 b6 = vec_madd(cnst, b6, b5); /* b6 = b5 + b6 * W0; */ \
162 \
163 x0 = vec_add(x4, x7); /* x0 = x4 + x7; */ \
164 x1 = vec_add(x5, x6); /* x1 = x5 + x6; */ \
165 x2 = vec_add(x4, x6); /* x2 = x4 + x6; */ \
166 x3 = vec_add(x5, x7); /* x3 = x5 + x7; */ \
167 x8 = vec_add(x2, x3); /* x8 = x2 + x3; */ \
168 cnst = LD_W3; \
169 x8 = vec_madd(cnst, x8, mzero); /* x8 = x8 * W3; */ \
170 \
171 cnst = LD_W8; \
172 x0 = vec_madd(cnst, x0, mzero); /* x0 *= W8; */ \
173 cnst = LD_W9; \
174 x1 = vec_madd(cnst, x1, mzero); /* x1 *= W9; */ \
175 cnst = LD_WA; \
176 x2 = vec_madd(cnst, x2, x8); /* x2 = x2 * WA + x8; */ \
177 cnst = LD_WB; \
178 x3 = vec_madd(cnst, x3, x8); /* x3 = x3 * WB + x8; */ \
179 \
180 cnst = LD_W4; \
181 b7 = vec_madd(cnst, x4, x0); /* b7 = x4 * W4 + x0; */ \
182 cnst = LD_W5; \
183 b5 = vec_madd(cnst, x5, x1); /* b5 = x5 * W5 + x1; */ \
184 cnst = LD_W6; \
185 b3 = vec_madd(cnst, x6, x1); /* b3 = x6 * W6 + x1; */ \
186 cnst = LD_W7; \
187 b1 = vec_madd(cnst, x7, x0); /* b1 = x7 * W7 + x0; */ \
188 \
189 b7 = vec_add(b7, x2); /* b7 += x2; */ \
190 b5 = vec_add(b5, x3); /* b5 += x3; */ \
191 b3 = vec_add(b3, x2); /* b3 += x2; */ \
192 b1 = vec_add(b1, x3) /* b1 += x3; */ \
193 /* }}} */
194
195 /* two dimensional discrete cosine transform */
196 void ff_fdct_altivec(int16_t *block)
197 {
198 vector signed short *bp;
199 vector float *cp = fdctconsts;
200 vector float b00, b10, b20, b30, b40, b50, b60, b70;
201 vector float b01, b11, b21, b31, b41, b51, b61, b71;
202 vector float mzero, cnst, cnsts0, cnsts1, cnsts2;
203 vector float x0, x1, x2, x3, x4, x5, x6, x7, x8;
204
205 /* setup constants {{{ */
206 /* mzero = -0.0 */
207 mzero = ((vector float) vec_splat_u32(-1));
208 mzero = ((vector float) vec_sl(vu32(mzero), vu32(mzero)));
209 cnsts0 = vec_ld(0, cp);
210 cp++;
211 cnsts1 = vec_ld(0, cp);
212 cp++;
213 cnsts2 = vec_ld(0, cp);
214 /* }}} */
215
216 /* 8x8 matrix transpose (vector short[8]) {{{ */
217 #define MERGE_S16(hl, a, b) vec_merge ## hl(vs16(a), vs16(b))
218
219 bp = (vector signed short *) block;
220 b00 = ((vector float) vec_ld(0, bp));
221 b40 = ((vector float) vec_ld(16 * 4, bp));
222 b01 = ((vector float) MERGE_S16(h, b00, b40));
223 b11 = ((vector float) MERGE_S16(l, b00, b40));
224 bp++;
225 b10 = ((vector float) vec_ld(0, bp));
226 b50 = ((vector float) vec_ld(16 * 4, bp));
227 b21 = ((vector float) MERGE_S16(h, b10, b50));
228 b31 = ((vector float) MERGE_S16(l, b10, b50));
229 bp++;
230 b20 = ((vector float) vec_ld(0, bp));
231 b60 = ((vector float) vec_ld(16 * 4, bp));
232 b41 = ((vector float) MERGE_S16(h, b20, b60));
233 b51 = ((vector float) MERGE_S16(l, b20, b60));
234 bp++;
235 b30 = ((vector float) vec_ld(0, bp));
236 b70 = ((vector float) vec_ld(16 * 4, bp));
237 b61 = ((vector float) MERGE_S16(h, b30, b70));
238 b71 = ((vector float) MERGE_S16(l, b30, b70));
239
240 x0 = ((vector float) MERGE_S16(h, b01, b41));
241 x1 = ((vector float) MERGE_S16(l, b01, b41));
242 x2 = ((vector float) MERGE_S16(h, b11, b51));
243 x3 = ((vector float) MERGE_S16(l, b11, b51));
244 x4 = ((vector float) MERGE_S16(h, b21, b61));
245 x5 = ((vector float) MERGE_S16(l, b21, b61));
246 x6 = ((vector float) MERGE_S16(h, b31, b71));
247 x7 = ((vector float) MERGE_S16(l, b31, b71));
248
249 b00 = ((vector float) MERGE_S16(h, x0, x4));
250 b10 = ((vector float) MERGE_S16(l, x0, x4));
251 b20 = ((vector float) MERGE_S16(h, x1, x5));
252 b30 = ((vector float) MERGE_S16(l, x1, x5));
253 b40 = ((vector float) MERGE_S16(h, x2, x6));
254 b50 = ((vector float) MERGE_S16(l, x2, x6));
255 b60 = ((vector float) MERGE_S16(h, x3, x7));
256 b70 = ((vector float) MERGE_S16(l, x3, x7));
257
258 #undef MERGE_S16
259 /* }}} */
260
261 /* Some of the initial calculations can be done as vector short
262 * before conversion to vector float. The following code section
263 * takes advantage of this. */
264
265 /* fdct rows {{{ */
266 x0 = ((vector float) vec_add(vs16(b00), vs16(b70)));
267 x7 = ((vector float) vec_sub(vs16(b00), vs16(b70)));
268 x1 = ((vector float) vec_add(vs16(b10), vs16(b60)));
269 x6 = ((vector float) vec_sub(vs16(b10), vs16(b60)));
270 x2 = ((vector float) vec_add(vs16(b20), vs16(b50)));
271 x5 = ((vector float) vec_sub(vs16(b20), vs16(b50)));
272 x3 = ((vector float) vec_add(vs16(b30), vs16(b40)));
273 x4 = ((vector float) vec_sub(vs16(b30), vs16(b40)));
274
275 b70 = ((vector float) vec_add(vs16(x0), vs16(x3)));
276 b10 = ((vector float) vec_add(vs16(x1), vs16(x2)));
277
278 b00 = ((vector float) vec_add(vs16(b70), vs16(b10)));
279 b40 = ((vector float) vec_sub(vs16(b70), vs16(b10)));
280
281 #define CTF0(n) \
282 b ## n ## 1 = ((vector float) vec_unpackl(vs16(b ## n ## 0))); \
283 b ## n ## 0 = ((vector float) vec_unpackh(vs16(b ## n ## 0))); \
284 b ## n ## 1 = vec_ctf(vs32(b ## n ## 1), 0); \
285 b ## n ## 0 = vec_ctf(vs32(b ## n ## 0), 0)
286
287 CTF0(0);
288 CTF0(4);
289
290 b20 = ((vector float) vec_sub(vs16(x0), vs16(x3)));
291 b60 = ((vector float) vec_sub(vs16(x1), vs16(x2)));
292
293 CTF0(2);
294 CTF0(6);
295
296 #undef CTF0
297
298 x0 = vec_add(b60, b20);
299 x1 = vec_add(b61, b21);
300
301 cnst = LD_W2;
302 x0 = vec_madd(cnst, x0, mzero);
303 x1 = vec_madd(cnst, x1, mzero);
304 cnst = LD_W1;
305 b20 = vec_madd(cnst, b20, x0);
306 b21 = vec_madd(cnst, b21, x1);
307 cnst = LD_W0;
308 b60 = vec_madd(cnst, b60, x0);
309 b61 = vec_madd(cnst, b61, x1);
310
311 #define CTFX(x, b) \
312 b ## 0 = ((vector float) vec_unpackh(vs16(x))); \
313 b ## 1 = ((vector float) vec_unpackl(vs16(x))); \
314 b ## 0 = vec_ctf(vs32(b ## 0), 0); \
315 b ## 1 = vec_ctf(vs32(b ## 1), 0)
316
317 CTFX(x4, b7);
318 CTFX(x5, b5);
319 CTFX(x6, b3);
320 CTFX(x7, b1);
321
322 #undef CTFX
323
324 x0 = vec_add(b70, b10);
325 x1 = vec_add(b50, b30);
326 x2 = vec_add(b70, b30);
327 x3 = vec_add(b50, b10);
328 x8 = vec_add(x2, x3);
329 cnst = LD_W3;
330 x8 = vec_madd(cnst, x8, mzero);
331
332 cnst = LD_W8;
333 x0 = vec_madd(cnst, x0, mzero);
334 cnst = LD_W9;
335 x1 = vec_madd(cnst, x1, mzero);
336 cnst = LD_WA;
337 x2 = vec_madd(cnst, x2, x8);
338 cnst = LD_WB;
339 x3 = vec_madd(cnst, x3, x8);
340
341 cnst = LD_W4;
342 b70 = vec_madd(cnst, b70, x0);
343 cnst = LD_W5;
344 b50 = vec_madd(cnst, b50, x1);
345 cnst = LD_W6;
346 b30 = vec_madd(cnst, b30, x1);
347 cnst = LD_W7;
348 b10 = vec_madd(cnst, b10, x0);
349
350 b70 = vec_add(b70, x2);
351 b50 = vec_add(b50, x3);
352 b30 = vec_add(b30, x2);
353 b10 = vec_add(b10, x3);
354
355 x0 = vec_add(b71, b11);
356 x1 = vec_add(b51, b31);
357 x2 = vec_add(b71, b31);
358 x3 = vec_add(b51, b11);
359 x8 = vec_add(x2, x3);
360 cnst = LD_W3;
361 x8 = vec_madd(cnst, x8, mzero);
362
363 cnst = LD_W8;
364 x0 = vec_madd(cnst, x0, mzero);
365 cnst = LD_W9;
366 x1 = vec_madd(cnst, x1, mzero);
367 cnst = LD_WA;
368 x2 = vec_madd(cnst, x2, x8);
369 cnst = LD_WB;
370 x3 = vec_madd(cnst, x3, x8);
371
372 cnst = LD_W4;
373 b71 = vec_madd(cnst, b71, x0);
374 cnst = LD_W5;
375 b51 = vec_madd(cnst, b51, x1);
376 cnst = LD_W6;
377 b31 = vec_madd(cnst, b31, x1);
378 cnst = LD_W7;
379 b11 = vec_madd(cnst, b11, x0);
380
381 b71 = vec_add(b71, x2);
382 b51 = vec_add(b51, x3);
383 b31 = vec_add(b31, x2);
384 b11 = vec_add(b11, x3);
385 /* }}} */
386
387 /* 8x8 matrix transpose (vector float[8][2]) {{{ */
388 x0 = vec_mergel(b00, b20);
389 x1 = vec_mergeh(b00, b20);
390 x2 = vec_mergel(b10, b30);
391 x3 = vec_mergeh(b10, b30);
392
393 b00 = vec_mergeh(x1, x3);
394 b10 = vec_mergel(x1, x3);
395 b20 = vec_mergeh(x0, x2);
396 b30 = vec_mergel(x0, x2);
397
398 x4 = vec_mergel(b41, b61);
399 x5 = vec_mergeh(b41, b61);
400 x6 = vec_mergel(b51, b71);
401 x7 = vec_mergeh(b51, b71);
402
403 b41 = vec_mergeh(x5, x7);
404 b51 = vec_mergel(x5, x7);
405 b61 = vec_mergeh(x4, x6);
406 b71 = vec_mergel(x4, x6);
407
408 x0 = vec_mergel(b01, b21);
409 x1 = vec_mergeh(b01, b21);
410 x2 = vec_mergel(b11, b31);
411 x3 = vec_mergeh(b11, b31);
412
413 x4 = vec_mergel(b40, b60);
414 x5 = vec_mergeh(b40, b60);
415 x6 = vec_mergel(b50, b70);
416 x7 = vec_mergeh(b50, b70);
417
418 b40 = vec_mergeh(x1, x3);
419 b50 = vec_mergel(x1, x3);
420 b60 = vec_mergeh(x0, x2);
421 b70 = vec_mergel(x0, x2);
422
423 b01 = vec_mergeh(x5, x7);
424 b11 = vec_mergel(x5, x7);
425 b21 = vec_mergeh(x4, x6);
426 b31 = vec_mergel(x4, x6);
427 /* }}} */
428
429 FDCTCOL(b00, b10, b20, b30, b40, b50, b60, b70);
430 FDCTCOL(b01, b11, b21, b31, b41, b51, b61, b71);
431
432 /* round, convert back to short {{{ */
433 #define CTS(n) \
434 b ## n ## 0 = vec_round(b ## n ## 0); \
435 b ## n ## 1 = vec_round(b ## n ## 1); \
436 b ## n ## 0 = ((vector float) vec_cts(b ## n ## 0, 0)); \
437 b ## n ## 1 = ((vector float) vec_cts(b ## n ## 1, 0)); \
438 b ## n ## 0 = ((vector float) vec_pack(vs32(b ## n ## 0), \
439 vs32(b ## n ## 1))); \
440 vec_st(vs16(b ## n ## 0), 0, bp)
441
442 bp = (vector signed short *) block;
443 CTS(0);
444 bp++;
445 CTS(1);
446 bp++;
447 CTS(2);
448 bp++;
449 CTS(3);
450 bp++;
451 CTS(4);
452 bp++;
453 CTS(5);
454 bp++;
455 CTS(6);
456 bp++;
457 CTS(7);
458
459 #undef CTS
460 /* }}} */
461 }
462
463 #endif /* HAVE_ALTIVEC */
464
465 av_cold void ff_fdctdsp_init_ppc(FDCTDSPContext *c, AVCodecContext *avctx,
466 unsigned high_bit_depth)
467 {
468 #if HAVE_ALTIVEC
469 if (!PPC_ALTIVEC(av_get_cpu_flags()))
470 return;
471
472 if (!high_bit_depth) {
473 if (avctx->dct_algo == FF_DCT_AUTO ||
474 avctx->dct_algo == FF_DCT_ALTIVEC) {
475 c->fdct = ff_fdct_altivec;
476 }
477 }
478 #endif /* HAVE_ALTIVEC */
479 }
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