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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 
23 #include "libavutil/attributes.h"
24 #include "libavutil/cpu.h"
25 #include "libavutil/ppc/cpu.h"
27 
28 #include "libavcodec/fdctdsp.h"
29 
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 0.98078528040323044912618224 /* cos(1 * PI / 16) */
41 #define C2 0.92387953251128675612818319 /* cos(2 * PI / 16) */
42 #define C3 0.83146961230254523707878838 /* cos(3 * PI / 16) */
43 #define C4 0.70710678118654752440084436 /* cos(4 * PI / 16) */
44 #define C5 0.55557023301960222474283081 /* cos(5 * PI / 16) */
45 #define C6 0.38268343236508977172845998 /* cos(6 * PI / 16) */
46 #define C7 0.19509032201612826784828487 /* cos(7 * PI / 16) */
47 
48 #define W0 -(2 * C2)
49 #define W1 (2 * C6)
50 #define W2 (M_SQRT2 * C6)
51 #define W3 (M_SQRT2 * C3)
52 #define W4 (M_SQRT2 * (-C1 + C3 + C5 - C7))
53 #define W5 (M_SQRT2 * (C1 + C3 - C5 + C7))
54 #define W6 (M_SQRT2 * (C1 + C3 + C5 - C7))
55 #define W7 (M_SQRT2 * (C1 + C3 - C5 - C7))
56 #define W8 (M_SQRT2 * (C7 - C3))
57 #define W9 (M_SQRT2 * (-C1 - C3))
58 #define WA (M_SQRT2 * (-C3 - C5))
59 #define WB (M_SQRT2 * (C5 - C3))
60 
61 static const vector float fdctconsts[3] = {
62  { W0, W1, W2, W3 },
63  { W4, W5, W6, W7 },
64  { W8, W9, WA, WB }
65 };
66 
67 #define LD_W0 vec_splat(cnsts0, 0)
68 #define LD_W1 vec_splat(cnsts0, 1)
69 #define LD_W2 vec_splat(cnsts0, 2)
70 #define LD_W3 vec_splat(cnsts0, 3)
71 #define LD_W4 vec_splat(cnsts1, 0)
72 #define LD_W5 vec_splat(cnsts1, 1)
73 #define LD_W6 vec_splat(cnsts1, 2)
74 #define LD_W7 vec_splat(cnsts1, 3)
75 #define LD_W8 vec_splat(cnsts2, 0)
76 #define LD_W9 vec_splat(cnsts2, 1)
77 #define LD_WA vec_splat(cnsts2, 2)
78 #define LD_WB vec_splat(cnsts2, 3)
79 
80 #define FDCTROW(b0, b1, b2, b3, b4, b5, b6, b7) /* {{{ */ \
81  x0 = vec_add(b0, b7); /* x0 = b0 + b7; */ \
82  x7 = vec_sub(b0, b7); /* x7 = b0 - b7; */ \
83  x1 = vec_add(b1, b6); /* x1 = b1 + b6; */ \
84  x6 = vec_sub(b1, b6); /* x6 = b1 - b6; */ \
85  x2 = vec_add(b2, b5); /* x2 = b2 + b5; */ \
86  x5 = vec_sub(b2, b5); /* x5 = b2 - b5; */ \
87  x3 = vec_add(b3, b4); /* x3 = b3 + b4; */ \
88  x4 = vec_sub(b3, b4); /* x4 = b3 - b4; */ \
89  \
90  b7 = vec_add(x0, x3); /* b7 = x0 + x3; */ \
91  b1 = vec_add(x1, x2); /* b1 = x1 + x2; */ \
92  b0 = vec_add(b7, b1); /* b0 = b7 + b1; */ \
93  b4 = vec_sub(b7, b1); /* b4 = b7 - b1; */ \
94  \
95  b2 = vec_sub(x0, x3); /* b2 = x0 - x3; */ \
96  b6 = vec_sub(x1, x2); /* b6 = x1 - x2; */ \
97  b5 = vec_add(b6, b2); /* b5 = b6 + b2; */ \
98  cnst = LD_W2; \
99  b5 = vec_madd(cnst, b5, mzero); /* b5 = b5 * W2; */ \
100  cnst = LD_W1; \
101  b2 = vec_madd(cnst, b2, b5); /* b2 = b5 + b2 * W1; */ \
102  cnst = LD_W0; \
103  b6 = vec_madd(cnst, b6, b5); /* b6 = b5 + b6 * W0; */ \
104  \
105  x0 = vec_add(x4, x7); /* x0 = x4 + x7; */ \
106  x1 = vec_add(x5, x6); /* x1 = x5 + x6; */ \
107  x2 = vec_add(x4, x6); /* x2 = x4 + x6; */ \
108  x3 = vec_add(x5, x7); /* x3 = x5 + x7; */ \
109  x8 = vec_add(x2, x3); /* x8 = x2 + x3; */ \
110  cnst = LD_W3; \
111  x8 = vec_madd(cnst, x8, mzero); /* x8 = x8 * W3; */ \
112  \
113  cnst = LD_W8; \
114  x0 = vec_madd(cnst, x0, mzero); /* x0 *= W8; */ \
115  cnst = LD_W9; \
116  x1 = vec_madd(cnst, x1, mzero); /* x1 *= W9; */ \
117  cnst = LD_WA; \
118  x2 = vec_madd(cnst, x2, x8); /* x2 = x2 * WA + x8; */ \
119  cnst = LD_WB; \
120  x3 = vec_madd(cnst, x3, x8); /* x3 = x3 * WB + x8; */ \
121  \
122  cnst = LD_W4; \
123  b7 = vec_madd(cnst, x4, x0); /* b7 = x4 * W4 + x0; */ \
124  cnst = LD_W5; \
125  b5 = vec_madd(cnst, x5, x1); /* b5 = x5 * W5 + x1; */ \
126  cnst = LD_W6; \
127  b3 = vec_madd(cnst, x6, x1); /* b3 = x6 * W6 + x1; */ \
128  cnst = LD_W7; \
129  b1 = vec_madd(cnst, x7, x0); /* b1 = x7 * W7 + x0; */ \
130  \
131  b7 = vec_add(b7, x2); /* b7 = b7 + x2; */ \
132  b5 = vec_add(b5, x3); /* b5 = b5 + x3; */ \
133  b3 = vec_add(b3, x2); /* b3 = b3 + x2; */ \
134  b1 = vec_add(b1, x3) /* b1 = b1 + x3; */ \
135  /* }}} */
136 
137 #define FDCTCOL(b0, b1, b2, b3, b4, b5, b6, b7) /* {{{ */ \
138  x0 = vec_add(b0, b7); /* x0 = b0 + b7; */ \
139  x7 = vec_sub(b0, b7); /* x7 = b0 - b7; */ \
140  x1 = vec_add(b1, b6); /* x1 = b1 + b6; */ \
141  x6 = vec_sub(b1, b6); /* x6 = b1 - b6; */ \
142  x2 = vec_add(b2, b5); /* x2 = b2 + b5; */ \
143  x5 = vec_sub(b2, b5); /* x5 = b2 - b5; */ \
144  x3 = vec_add(b3, b4); /* x3 = b3 + b4; */ \
145  x4 = vec_sub(b3, b4); /* x4 = b3 - b4; */ \
146  \
147  b7 = vec_add(x0, x3); /* b7 = x0 + x3; */ \
148  b1 = vec_add(x1, x2); /* b1 = x1 + x2; */ \
149  b0 = vec_add(b7, b1); /* b0 = b7 + b1; */ \
150  b4 = vec_sub(b7, b1); /* b4 = b7 - b1; */ \
151  \
152  b2 = vec_sub(x0, x3); /* b2 = x0 - x3; */ \
153  b6 = vec_sub(x1, x2); /* b6 = x1 - x2; */ \
154  b5 = vec_add(b6, b2); /* b5 = b6 + b2; */ \
155  cnst = LD_W2; \
156  b5 = vec_madd(cnst, b5, mzero); /* b5 = b5 * W2; */ \
157  cnst = LD_W1; \
158  b2 = vec_madd(cnst, b2, b5); /* b2 = b5 + b2 * W1; */ \
159  cnst = LD_W0; \
160  b6 = vec_madd(cnst, b6, b5); /* b6 = b5 + b6 * W0; */ \
161  \
162  x0 = vec_add(x4, x7); /* x0 = x4 + x7; */ \
163  x1 = vec_add(x5, x6); /* x1 = x5 + x6; */ \
164  x2 = vec_add(x4, x6); /* x2 = x4 + x6; */ \
165  x3 = vec_add(x5, x7); /* x3 = x5 + x7; */ \
166  x8 = vec_add(x2, x3); /* x8 = x2 + x3; */ \
167  cnst = LD_W3; \
168  x8 = vec_madd(cnst, x8, mzero); /* x8 = x8 * W3; */ \
169  \
170  cnst = LD_W8; \
171  x0 = vec_madd(cnst, x0, mzero); /* x0 *= W8; */ \
172  cnst = LD_W9; \
173  x1 = vec_madd(cnst, x1, mzero); /* x1 *= W9; */ \
174  cnst = LD_WA; \
175  x2 = vec_madd(cnst, x2, x8); /* x2 = x2 * WA + x8; */ \
176  cnst = LD_WB; \
177  x3 = vec_madd(cnst, x3, x8); /* x3 = x3 * WB + x8; */ \
178  \
179  cnst = LD_W4; \
180  b7 = vec_madd(cnst, x4, x0); /* b7 = x4 * W4 + x0; */ \
181  cnst = LD_W5; \
182  b5 = vec_madd(cnst, x5, x1); /* b5 = x5 * W5 + x1; */ \
183  cnst = LD_W6; \
184  b3 = vec_madd(cnst, x6, x1); /* b3 = x6 * W6 + x1; */ \
185  cnst = LD_W7; \
186  b1 = vec_madd(cnst, x7, x0); /* b1 = x7 * W7 + x0; */ \
187  \
188  b7 = vec_add(b7, x2); /* b7 += x2; */ \
189  b5 = vec_add(b5, x3); /* b5 += x3; */ \
190  b3 = vec_add(b3, x2); /* b3 += x2; */ \
191  b1 = vec_add(b1, x3) /* b1 += x3; */ \
192  /* }}} */
193 
194 /* two dimensional discrete cosine transform */
195 void ff_fdct_altivec(int16_t *block)
196 {
197  vector signed short *bp;
198  const vector float *cp = fdctconsts;
199  vector float b00, b10, b20, b30, b40, b50, b60, b70;
200  vector float b01, b11, b21, b31, b41, b51, b61, b71;
201  vector float mzero, cnst, cnsts0, cnsts1, cnsts2;
202  vector float x0, x1, x2, x3, x4, x5, x6, x7, x8;
203 
204  /* setup constants {{{ */
205  /* mzero = -0.0 */
206  mzero = ((vector float) vec_splat_u32(-1));
207  mzero = ((vector float) vec_sl(vu32(mzero), vu32(mzero)));
208  cnsts0 = vec_ld(0, cp);
209  cp++;
210  cnsts1 = vec_ld(0, cp);
211  cp++;
212  cnsts2 = vec_ld(0, cp);
213  /* }}} */
214 
215  /* 8x8 matrix transpose (vector short[8]) {{{ */
216 #define MERGE_S16(hl, a, b) vec_merge ## hl(vs16(a), vs16(b))
217 
218  bp = (vector signed short *) block;
219  b00 = ((vector float) vec_ld(0, bp));
220  b40 = ((vector float) vec_ld(16 * 4, bp));
221  b01 = ((vector float) MERGE_S16(h, b00, b40));
222  b11 = ((vector float) MERGE_S16(l, b00, b40));
223  bp++;
224  b10 = ((vector float) vec_ld(0, bp));
225  b50 = ((vector float) vec_ld(16 * 4, bp));
226  b21 = ((vector float) MERGE_S16(h, b10, b50));
227  b31 = ((vector float) MERGE_S16(l, b10, b50));
228  bp++;
229  b20 = ((vector float) vec_ld(0, bp));
230  b60 = ((vector float) vec_ld(16 * 4, bp));
231  b41 = ((vector float) MERGE_S16(h, b20, b60));
232  b51 = ((vector float) MERGE_S16(l, b20, b60));
233  bp++;
234  b30 = ((vector float) vec_ld(0, bp));
235  b70 = ((vector float) vec_ld(16 * 4, bp));
236  b61 = ((vector float) MERGE_S16(h, b30, b70));
237  b71 = ((vector float) MERGE_S16(l, b30, b70));
238 
239  x0 = ((vector float) MERGE_S16(h, b01, b41));
240  x1 = ((vector float) MERGE_S16(l, b01, b41));
241  x2 = ((vector float) MERGE_S16(h, b11, b51));
242  x3 = ((vector float) MERGE_S16(l, b11, b51));
243  x4 = ((vector float) MERGE_S16(h, b21, b61));
244  x5 = ((vector float) MERGE_S16(l, b21, b61));
245  x6 = ((vector float) MERGE_S16(h, b31, b71));
246  x7 = ((vector float) MERGE_S16(l, b31, b71));
247 
248  b00 = ((vector float) MERGE_S16(h, x0, x4));
249  b10 = ((vector float) MERGE_S16(l, x0, x4));
250  b20 = ((vector float) MERGE_S16(h, x1, x5));
251  b30 = ((vector float) MERGE_S16(l, x1, x5));
252  b40 = ((vector float) MERGE_S16(h, x2, x6));
253  b50 = ((vector float) MERGE_S16(l, x2, x6));
254  b60 = ((vector float) MERGE_S16(h, x3, x7));
255  b70 = ((vector float) MERGE_S16(l, x3, x7));
256 
257 #undef MERGE_S16
258  /* }}} */
259 
260  /* Some of the initial calculations can be done as vector short
261  * before conversion to vector float. The following code section
262  * takes advantage of this. */
263 
264  /* fdct rows {{{ */
265  x0 = ((vector float) vec_add(vs16(b00), vs16(b70)));
266  x7 = ((vector float) vec_sub(vs16(b00), vs16(b70)));
267  x1 = ((vector float) vec_add(vs16(b10), vs16(b60)));
268  x6 = ((vector float) vec_sub(vs16(b10), vs16(b60)));
269  x2 = ((vector float) vec_add(vs16(b20), vs16(b50)));
270  x5 = ((vector float) vec_sub(vs16(b20), vs16(b50)));
271  x3 = ((vector float) vec_add(vs16(b30), vs16(b40)));
272  x4 = ((vector float) vec_sub(vs16(b30), vs16(b40)));
273 
274  b70 = ((vector float) vec_add(vs16(x0), vs16(x3)));
275  b10 = ((vector float) vec_add(vs16(x1), vs16(x2)));
276 
277  b00 = ((vector float) vec_add(vs16(b70), vs16(b10)));
278  b40 = ((vector float) vec_sub(vs16(b70), vs16(b10)));
279 
280 #define CTF0(n) \
281  b ## n ## 1 = ((vector float) vec_unpackl(vs16(b ## n ## 0))); \
282  b ## n ## 0 = ((vector float) vec_unpackh(vs16(b ## n ## 0))); \
283  b ## n ## 1 = vec_ctf(vs32(b ## n ## 1), 0); \
284  b ## n ## 0 = vec_ctf(vs32(b ## n ## 0), 0)
285 
286  CTF0(0);
287  CTF0(4);
288 
289  b20 = ((vector float) vec_sub(vs16(x0), vs16(x3)));
290  b60 = ((vector float) vec_sub(vs16(x1), vs16(x2)));
291 
292  CTF0(2);
293  CTF0(6);
294 
295 #undef CTF0
296 
297  x0 = vec_add(b60, b20);
298  x1 = vec_add(b61, b21);
299 
300  cnst = LD_W2;
301  x0 = vec_madd(cnst, x0, mzero);
302  x1 = vec_madd(cnst, x1, mzero);
303  cnst = LD_W1;
304  b20 = vec_madd(cnst, b20, x0);
305  b21 = vec_madd(cnst, b21, x1);
306  cnst = LD_W0;
307  b60 = vec_madd(cnst, b60, x0);
308  b61 = vec_madd(cnst, b61, x1);
309 
310 #define CTFX(x, b) \
311  b ## 0 = ((vector float) vec_unpackh(vs16(x))); \
312  b ## 1 = ((vector float) vec_unpackl(vs16(x))); \
313  b ## 0 = vec_ctf(vs32(b ## 0), 0); \
314  b ## 1 = vec_ctf(vs32(b ## 1), 0)
315 
316  CTFX(x4, b7);
317  CTFX(x5, b5);
318  CTFX(x6, b3);
319  CTFX(x7, b1);
320 
321 #undef CTFX
322 
323  x0 = vec_add(b70, b10);
324  x1 = vec_add(b50, b30);
325  x2 = vec_add(b70, b30);
326  x3 = vec_add(b50, b10);
327  x8 = vec_add(x2, x3);
328  cnst = LD_W3;
329  x8 = vec_madd(cnst, x8, mzero);
330 
331  cnst = LD_W8;
332  x0 = vec_madd(cnst, x0, mzero);
333  cnst = LD_W9;
334  x1 = vec_madd(cnst, x1, mzero);
335  cnst = LD_WA;
336  x2 = vec_madd(cnst, x2, x8);
337  cnst = LD_WB;
338  x3 = vec_madd(cnst, x3, x8);
339 
340  cnst = LD_W4;
341  b70 = vec_madd(cnst, b70, x0);
342  cnst = LD_W5;
343  b50 = vec_madd(cnst, b50, x1);
344  cnst = LD_W6;
345  b30 = vec_madd(cnst, b30, x1);
346  cnst = LD_W7;
347  b10 = vec_madd(cnst, b10, x0);
348 
349  b70 = vec_add(b70, x2);
350  b50 = vec_add(b50, x3);
351  b30 = vec_add(b30, x2);
352  b10 = vec_add(b10, x3);
353 
354  x0 = vec_add(b71, b11);
355  x1 = vec_add(b51, b31);
356  x2 = vec_add(b71, b31);
357  x3 = vec_add(b51, b11);
358  x8 = vec_add(x2, x3);
359  cnst = LD_W3;
360  x8 = vec_madd(cnst, x8, mzero);
361 
362  cnst = LD_W8;
363  x0 = vec_madd(cnst, x0, mzero);
364  cnst = LD_W9;
365  x1 = vec_madd(cnst, x1, mzero);
366  cnst = LD_WA;
367  x2 = vec_madd(cnst, x2, x8);
368  cnst = LD_WB;
369  x3 = vec_madd(cnst, x3, x8);
370 
371  cnst = LD_W4;
372  b71 = vec_madd(cnst, b71, x0);
373  cnst = LD_W5;
374  b51 = vec_madd(cnst, b51, x1);
375  cnst = LD_W6;
376  b31 = vec_madd(cnst, b31, x1);
377  cnst = LD_W7;
378  b11 = vec_madd(cnst, b11, x0);
379 
380  b71 = vec_add(b71, x2);
381  b51 = vec_add(b51, x3);
382  b31 = vec_add(b31, x2);
383  b11 = vec_add(b11, x3);
384  /* }}} */
385 
386  /* 8x8 matrix transpose (vector float[8][2]) {{{ */
387  x0 = vec_mergel(b00, b20);
388  x1 = vec_mergeh(b00, b20);
389  x2 = vec_mergel(b10, b30);
390  x3 = vec_mergeh(b10, b30);
391 
392  b00 = vec_mergeh(x1, x3);
393  b10 = vec_mergel(x1, x3);
394  b20 = vec_mergeh(x0, x2);
395  b30 = vec_mergel(x0, x2);
396 
397  x4 = vec_mergel(b41, b61);
398  x5 = vec_mergeh(b41, b61);
399  x6 = vec_mergel(b51, b71);
400  x7 = vec_mergeh(b51, b71);
401 
402  b41 = vec_mergeh(x5, x7);
403  b51 = vec_mergel(x5, x7);
404  b61 = vec_mergeh(x4, x6);
405  b71 = vec_mergel(x4, x6);
406 
407  x0 = vec_mergel(b01, b21);
408  x1 = vec_mergeh(b01, b21);
409  x2 = vec_mergel(b11, b31);
410  x3 = vec_mergeh(b11, b31);
411 
412  x4 = vec_mergel(b40, b60);
413  x5 = vec_mergeh(b40, b60);
414  x6 = vec_mergel(b50, b70);
415  x7 = vec_mergeh(b50, b70);
416 
417  b40 = vec_mergeh(x1, x3);
418  b50 = vec_mergel(x1, x3);
419  b60 = vec_mergeh(x0, x2);
420  b70 = vec_mergel(x0, x2);
421 
422  b01 = vec_mergeh(x5, x7);
423  b11 = vec_mergel(x5, x7);
424  b21 = vec_mergeh(x4, x6);
425  b31 = vec_mergel(x4, x6);
426  /* }}} */
427 
428  FDCTCOL(b00, b10, b20, b30, b40, b50, b60, b70);
429  FDCTCOL(b01, b11, b21, b31, b41, b51, b61, b71);
430 
431  /* round, convert back to short {{{ */
432 #define CTS(n) \
433  b ## n ## 0 = vec_round(b ## n ## 0); \
434  b ## n ## 1 = vec_round(b ## n ## 1); \
435  b ## n ## 0 = ((vector float) vec_cts(b ## n ## 0, 0)); \
436  b ## n ## 1 = ((vector float) vec_cts(b ## n ## 1, 0)); \
437  b ## n ## 0 = ((vector float) vec_pack(vs32(b ## n ## 0), \
438  vs32(b ## n ## 1))); \
439  vec_st(vs16(b ## n ## 0), 0, bp)
440 
441  bp = (vector signed short *) block;
442  CTS(0);
443  bp++;
444  CTS(1);
445  bp++;
446  CTS(2);
447  bp++;
448  CTS(3);
449  bp++;
450  CTS(4);
451  bp++;
452  CTS(5);
453  bp++;
454  CTS(6);
455  bp++;
456  CTS(7);
457 
458 #undef CTS
459  /* }}} */
460 }
461 
462 #endif /* HAVE_ALTIVEC */
463 
465  unsigned high_bit_depth)
466 {
467 #if HAVE_ALTIVEC
469  return;
470 
471  if (!high_bit_depth) {
472  if (avctx->dct_algo == FF_DCT_AUTO ||
473  avctx->dct_algo == FF_DCT_ALTIVEC) {
474  c->fdct = ff_fdct_altivec;
475  }
476  }
477 #endif /* HAVE_ALTIVEC */
478 }
#define W6
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:2670
#define W2
Macro definitions for various function/variable attributes.
#define W5
static int16_t block[64]
Definition: dct.c:115
#define W1
#define av_cold
Definition: attributes.h:82
#define W7
void ff_fdct_altivec(int16_t *block)
#define W3
#define PPC_ALTIVEC(flags)
Definition: cpu.h:26
#define FF_DCT_ALTIVEC
Definition: avcodec.h:2675
static const int WB[80]
Definition: ripemd.c:80
#define W4
static const int WA[80]
Definition: ripemd.c:72
void(* fdct)(int16_t *block)
Definition: fdctdsp.h:27
main external API structure.
Definition: avcodec.h:1488
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:92
Contains misc utility macros and inline functions.
av_cold void ff_fdctdsp_init_ppc(FDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: fdctdsp.c:464
#define W0
Definition: wmv2dsp_mmi.c:28
static double c[64]
#define FF_DCT_AUTO
Definition: avcodec.h:2671