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fdctdsp.c
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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  const 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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