FFmpeg
dct.c
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1 /*
2  * (c) 2001 Fabrice Bellard
3  * 2007 Marc Hoffman <marc.hoffman@analog.com>
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  * DCT test (c) 2001 Fabrice Bellard
25  * Started from sample code by Juan J. Sierralta P.
26  */
27 
28 #include "config.h"
29 #include "config_components.h"
30 #include <stdlib.h>
31 #include <stdio.h>
32 #include <string.h>
33 #if HAVE_UNISTD_H
34 #include <unistd.h>
35 #endif
36 #include <math.h>
37 
38 #include "libavutil/cpu.h"
39 #include "libavutil/common.h"
40 #include "libavutil/internal.h"
41 #include "libavutil/lfg.h"
42 #include "libavutil/mem_internal.h"
43 #include "libavutil/time.h"
44 
45 #include "libavcodec/dct.h"
46 #include "libavcodec/idctdsp.h"
47 #include "libavcodec/simple_idct.h"
48 #include "libavcodec/xvididct.h"
49 #include "libavcodec/aandcttab.h"
50 #include "libavcodec/faandct.h"
51 #include "libavcodec/faanidct.h"
52 #include "libavcodec/dctref.h"
53 
54 struct algo {
55  const char *name;
56  void (*func)(int16_t *block);
58  int cpu_flag;
59  int nonspec;
60 };
61 
62 static const struct algo fdct_tab[] = {
63  { "REF-DBL", ff_ref_fdct, FF_IDCT_PERM_NONE },
64  { "IJG-AAN-INT", ff_fdct_ifast, FF_IDCT_PERM_NONE },
65  { "IJG-LLM-INT", ff_jpeg_fdct_islow_8, FF_IDCT_PERM_NONE },
66 #if CONFIG_FAANDCT
67  { "FAAN", ff_faandct, FF_IDCT_PERM_NONE },
68 #endif /* CONFIG_FAANDCT */
69 };
70 
71 static void ff_prores_idct_wrap(int16_t *dst){
72  LOCAL_ALIGNED(16, int16_t, qmat, [64]);
73  int i;
74 
75  for(i=0; i<64; i++){
76  qmat[i]=4;
77  }
78  ff_prores_idct_10(dst, qmat);
79  for(i=0; i<64; i++) {
80  dst[i] -= 512;
81  }
82 }
83 
84 static const struct algo idct_tab[] = {
85  { "REF-DBL", ff_ref_idct, FF_IDCT_PERM_NONE },
89  { "SIMPLE-C12", ff_simple_idct_int16_12bit, FF_IDCT_PERM_NONE, 0, 1 },
90  { "PR-C", ff_prores_idct_wrap, FF_IDCT_PERM_NONE, 0, 1 },
91 #if CONFIG_FAANIDCT
92  { "FAANI", ff_faanidct, FF_IDCT_PERM_NONE },
93 #endif /* CONFIG_FAANIDCT */
94 #if CONFIG_MPEG4_DECODER
95  { "XVID", ff_xvid_idct, FF_IDCT_PERM_NONE, 0, 1 },
96 #endif /* CONFIG_MPEG4_DECODER */
97 };
98 
99 #if ARCH_AARCH64
100 #include "aarch64/dct.c"
101 #elif ARCH_ARM
102 #include "arm/dct.c"
103 #elif ARCH_PPC
104 #include "ppc/dct.c"
105 #elif ARCH_X86
106 #include "x86/dct.c"
107 #else
108 static const struct algo fdct_tab_arch[] = { { 0 } };
109 static const struct algo idct_tab_arch[] = { { 0 } };
110 #endif
111 
112 #define AANSCALE_BITS 12
113 
114 #define NB_ITS 20000
115 #define NB_ITS_SPEED 50000
116 
117 DECLARE_ALIGNED(16, static int16_t, block)[64];
118 DECLARE_ALIGNED(8, static int16_t, block1)[64];
119 
120 static void init_block(int16_t block[64], int test, int is_idct, AVLFG *prng, int vals)
121 {
122  int i, j;
123 
124  memset(block, 0, 64 * sizeof(*block));
125 
126  switch (test) {
127  case 0:
128  for (i = 0; i < 64; i++)
129  block[i] = (av_lfg_get(prng) % (2*vals)) -vals;
130  if (is_idct) {
132  for (i = 0; i < 64; i++)
133  block[i] >>= 3;
134  }
135  break;
136  case 1:
137  j = av_lfg_get(prng) % 10 + 1;
138  for (i = 0; i < j; i++) {
139  int idx = av_lfg_get(prng) % 64;
140  block[idx] = av_lfg_get(prng) % (2*vals) -vals;
141  }
142  break;
143  case 2:
144  block[ 0] = av_lfg_get(prng) % (16*vals) - (8*vals);
145  block[63] = (block[0] & 1) ^ 1;
146  break;
147  }
148 }
149 
150 static void permute(int16_t dst[64], const int16_t src[64],
152 {
153  int i;
154 
155 #if ARCH_X86
156  if (permute_x86(dst, src, perm_type))
157  return;
158 #endif
159 
160  switch (perm_type) {
162  for (i = 0; i < 64; i++)
163  dst[(i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2)] = src[i];
164  break;
166  for (i = 0; i < 64; i++)
167  dst[(i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3)] = src[i];
168  break;
170  for (i = 0; i < 64; i++)
171  dst[(i>>3) | ((i<<3)&0x38)] = src[i];
172  break;
173  default:
174  for (i = 0; i < 64; i++)
175  dst[i] = src[i];
176  break;
177  }
178 }
179 
180 static int dct_error(const struct algo *dct, int test, int is_idct, int speed, const int bits)
181 {
182  void (*ref)(int16_t *block) = is_idct ? ff_ref_idct : ff_ref_fdct;
183  int it, i, scale;
184  int err_inf, v;
185  int64_t err2, ti, ti1, it1, err_sum = 0;
186  int64_t sysErr[64], sysErrMax = 0;
187  int64_t err2_matrix[64], err2_max = 0;
188  int maxout = 0;
189  int blockSumErrMax = 0, blockSumErr;
190  AVLFG prng;
191  const int vals=1<<bits;
192  double omse, ome;
193  int spec_err;
194 
195  av_lfg_init(&prng, 1);
196 
197  err_inf = 0;
198  err2 = 0;
199  for (i = 0; i < 64; i++)
200  err2_matrix[i] = sysErr[i] = 0;
201  for (it = 0; it < NB_ITS; it++) {
202  init_block(block1, test, is_idct, &prng, vals);
203  permute(block, block1, dct->perm_type);
204 
205  dct->func(block);
206  emms_c();
207 
208  if (!strcmp(dct->name, "IJG-AAN-INT")) {
209  for (i = 0; i < 64; i++) {
210  scale = 8 * (1 << (AANSCALE_BITS + 11)) / ff_aanscales[i];
211  block[i] = (block[i] * scale) >> AANSCALE_BITS;
212  }
213  }
214 
215  ref(block1);
216  if (!strcmp(dct->name, "PR-SSE2"))
217  for (i = 0; i < 64; i++)
218  block1[i] = av_clip(block1[i], 4-512, 1019-512);
219 
220  blockSumErr = 0;
221  for (i = 0; i < 64; i++) {
222  int err = block[i] - block1[i];
223  err_sum += err;
224  v = abs(err);
225  if (v > err_inf)
226  err_inf = v;
227  err2_matrix[i] += v * v;
228  err2 += v * v;
229  sysErr[i] += block[i] - block1[i];
230  blockSumErr += v;
231  if (abs(block[i]) > maxout)
232  maxout = abs(block[i]);
233  }
234  if (blockSumErrMax < blockSumErr)
235  blockSumErrMax = blockSumErr;
236  }
237  for (i = 0; i < 64; i++) {
238  sysErrMax = FFMAX(sysErrMax, FFABS(sysErr[i]));
239  err2_max = FFMAX(err2_max , FFABS(err2_matrix[i]));
240  }
241 
242  for (i = 0; i < 64; i++) {
243  if (i % 8 == 0)
244  printf("\n");
245  printf("%7d ", (int) sysErr[i]);
246  }
247  printf("\n");
248 
249  omse = (double) err2 / NB_ITS / 64;
250  ome = (double) err_sum / NB_ITS / 64;
251 
252  spec_err = is_idct && (err_inf > 1 || omse > 0.02 || fabs(ome) > 0.0015);
253  if (test < 2)
254  spec_err = is_idct && ((double) err2_max / NB_ITS > 0.06 || (double) sysErrMax / NB_ITS > 0.015);
255 
256  printf("%s %s: max_err=%d omse=%0.8f ome=%0.8f syserr=%0.8f maxout=%d blockSumErr=%d\n",
257  is_idct ? "IDCT" : "DCT", dct->name, err_inf,
258  omse, ome, (double) sysErrMax / NB_ITS,
259  maxout, blockSumErrMax);
260 
261  if (spec_err && !dct->nonspec) {
262  printf("Failed!\n");
263  return 1;
264  }
265 
266  if (!speed)
267  return 0;
268 
269  /* speed test */
270 
271  init_block(block, test, is_idct, &prng, vals);
272  permute(block1, block, dct->perm_type);
273 
274  ti = av_gettime_relative();
275  it1 = 0;
276  do {
277  for (it = 0; it < NB_ITS_SPEED; it++) {
278  memcpy(block, block1, sizeof(block));
279  dct->func(block);
280  }
281  emms_c();
282  it1 += NB_ITS_SPEED;
283  ti1 = av_gettime_relative() - ti;
284  } while (ti1 < 1000000);
285 
286  printf("%s %s: %0.1f kdct/s\n", is_idct ? "IDCT" : "DCT", dct->name,
287  (double) it1 * 1000.0 / (double) ti1);
288 
289  return 0;
290 }
291 
292 DECLARE_ALIGNED(8, static uint8_t, img_dest)[64];
293 DECLARE_ALIGNED(8, static uint8_t, img_dest1)[64];
294 
295 static void idct248_ref(uint8_t *dest, ptrdiff_t linesize, int16_t *block)
296 {
297  static int init;
298  static double c8[8][8];
299  static double c4[4][4];
300  double block1[64], block2[64], block3[64];
301  double s, sum, v;
302  int i, j, k;
303 
304  if (!init) {
305  init = 1;
306 
307  for (i = 0; i < 8; i++) {
308  sum = 0;
309  for (j = 0; j < 8; j++) {
310  s = (i == 0) ? sqrt(1.0 / 8.0) : sqrt(1.0 / 4.0);
311  c8[i][j] = s * cos(M_PI * i * (j + 0.5) / 8.0);
312  sum += c8[i][j] * c8[i][j];
313  }
314  }
315 
316  for (i = 0; i < 4; i++) {
317  sum = 0;
318  for (j = 0; j < 4; j++) {
319  s = (i == 0) ? sqrt(1.0 / 4.0) : sqrt(1.0 / 2.0);
320  c4[i][j] = s * cos(M_PI * i * (j + 0.5) / 4.0);
321  sum += c4[i][j] * c4[i][j];
322  }
323  }
324  }
325 
326  /* butterfly */
327  s = 0.5 * sqrt(2.0);
328  for (i = 0; i < 4; i++) {
329  for (j = 0; j < 8; j++) {
330  block1[8 * (2 * i) + j] =
331  (block[8 * (2 * i) + j] + block[8 * (2 * i + 1) + j]) * s;
332  block1[8 * (2 * i + 1) + j] =
333  (block[8 * (2 * i) + j] - block[8 * (2 * i + 1) + j]) * s;
334  }
335  }
336 
337  /* idct8 on lines */
338  for (i = 0; i < 8; i++) {
339  for (j = 0; j < 8; j++) {
340  sum = 0;
341  for (k = 0; k < 8; k++)
342  sum += c8[k][j] * block1[8 * i + k];
343  block2[8 * i + j] = sum;
344  }
345  }
346 
347  /* idct4 */
348  for (i = 0; i < 8; i++) {
349  for (j = 0; j < 4; j++) {
350  /* top */
351  sum = 0;
352  for (k = 0; k < 4; k++)
353  sum += c4[k][j] * block2[8 * (2 * k) + i];
354  block3[8 * (2 * j) + i] = sum;
355 
356  /* bottom */
357  sum = 0;
358  for (k = 0; k < 4; k++)
359  sum += c4[k][j] * block2[8 * (2 * k + 1) + i];
360  block3[8 * (2 * j + 1) + i] = sum;
361  }
362  }
363 
364  /* clamp and store the result */
365  for (i = 0; i < 8; i++) {
366  for (j = 0; j < 8; j++) {
367  v = block3[8 * i + j];
368  if (v < 0) v = 0;
369  else if (v > 255) v = 255;
370  dest[i * linesize + j] = (int) rint(v);
371  }
372  }
373 }
374 
375 static void idct248_error(const char *name,
376  void (*idct248_put)(uint8_t *dest,
377  ptrdiff_t line_size,
378  int16_t *block),
379  int speed)
380 {
381  int it, i, it1, ti, ti1, err_max, v;
382  AVLFG prng;
383 
384  av_lfg_init(&prng, 1);
385 
386  /* just one test to see if code is correct (precision is less
387  important here) */
388  err_max = 0;
389  for (it = 0; it < NB_ITS; it++) {
390  /* XXX: use forward transform to generate values */
391  for (i = 0; i < 64; i++)
392  block1[i] = av_lfg_get(&prng) % 256 - 128;
393  block1[0] += 1024;
394 
395  for (i = 0; i < 64; i++)
396  block[i] = block1[i];
398 
399  for (i = 0; i < 64; i++)
400  block[i] = block1[i];
401  idct248_put(img_dest, 8, block);
402 
403  for (i = 0; i < 64; i++) {
404  v = abs((int) img_dest[i] - (int) img_dest1[i]);
405  if (v == 255)
406  printf("%d %d\n", img_dest[i], img_dest1[i]);
407  if (v > err_max)
408  err_max = v;
409  }
410 #if 0
411  printf("ref=\n");
412  for(i=0;i<8;i++) {
413  int j;
414  for(j=0;j<8;j++) {
415  printf(" %3d", img_dest1[i*8+j]);
416  }
417  printf("\n");
418  }
419 
420  printf("out=\n");
421  for(i=0;i<8;i++) {
422  int j;
423  for(j=0;j<8;j++) {
424  printf(" %3d", img_dest[i*8+j]);
425  }
426  printf("\n");
427  }
428 #endif
429  }
430  printf("%s %s: err_inf=%d\n", 1 ? "IDCT248" : "DCT248", name, err_max);
431 
432  if (!speed)
433  return;
434 
435  ti = av_gettime_relative();
436  it1 = 0;
437  do {
438  for (it = 0; it < NB_ITS_SPEED; it++) {
439  for (i = 0; i < 64; i++)
440  block[i] = block1[i];
441  idct248_put(img_dest, 8, block);
442  }
443  emms_c();
444  it1 += NB_ITS_SPEED;
445  ti1 = av_gettime_relative() - ti;
446  } while (ti1 < 1000000);
447 
448  printf("%s %s: %0.1f kdct/s\n", 1 ? "IDCT248" : "DCT248", name,
449  (double) it1 * 1000.0 / (double) ti1);
450 }
451 
452 static void help(void)
453 {
454  printf("dct-test [-i] [<test-number>] [<bits>]\n"
455  "test-number 0 -> test with random matrixes\n"
456  " 1 -> test with random sparse matrixes\n"
457  " 2 -> do 3. test from MPEG-4 std\n"
458  "bits Number of time domain bits to use, 8 is default\n"
459  "-i test IDCT implementations\n"
460  "-4 test IDCT248 implementations\n"
461  "-t speed test\n");
462 }
463 
464 #if !HAVE_GETOPT
465 #include "compat/getopt.c"
466 #endif
467 
468 int main(int argc, char **argv)
469 {
470  int test_idct = 0, test_248_dct = 0;
471  int c, i;
472  int test = 1;
473  int speed = 0;
474  int err = 0;
475  int bits=8;
476 
477  ff_ref_dct_init();
478 
479  for (;;) {
480  c = getopt(argc, argv, "ih4t");
481  if (c == -1)
482  break;
483  switch (c) {
484  case 'i':
485  test_idct = 1;
486  break;
487  case '4':
488  test_248_dct = 1;
489  break;
490  case 't':
491  speed = 1;
492  break;
493  default:
494  case 'h':
495  help();
496  return 0;
497  }
498  }
499 
500  if (optind < argc)
501  test = atoi(argv[optind]);
502  if(optind+1 < argc) bits= atoi(argv[optind+1]);
503 
504  printf("ffmpeg DCT/IDCT test\n");
505 
506  if (test_248_dct) {
507  idct248_error("SIMPLE-C", ff_simple_idct248_put, speed);
508  } else {
509  const int cpu_flags = av_get_cpu_flags();
510  if (test_idct) {
511  for (i = 0; i < FF_ARRAY_ELEMS(idct_tab); i++)
512  err |= dct_error(&idct_tab[i], test, test_idct, speed, bits);
513 
514  for (i = 0; idct_tab_arch[i].name; i++)
515  if (!(~cpu_flags & idct_tab_arch[i].cpu_flag))
516  err |= dct_error(&idct_tab_arch[i], test, test_idct, speed, bits);
517  }
518 #if CONFIG_FDCTDSP
519  else {
520  for (i = 0; i < FF_ARRAY_ELEMS(fdct_tab); i++)
521  err |= dct_error(&fdct_tab[i], test, test_idct, speed, bits);
522 
523  for (i = 0; fdct_tab_arch[i].name; i++)
524  if (!(~cpu_flags & fdct_tab_arch[i].cpu_flag))
525  err |= dct_error(&fdct_tab_arch[i], test, test_idct, speed, bits);
526  }
527 #endif /* CONFIG_FDCTDSP */
528  }
529 
530  if (err)
531  printf("Error: %d.\n", err);
532 
533  return !!err;
534 }
av_gettime_relative
int64_t av_gettime_relative(void)
Get the current time in microseconds since some unspecified starting point.
Definition: time.c:56
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it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
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Definition: lfg.c:32
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Definition: dctref.c:41
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Definition: cpu.c:101
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Definition: dct.c:120
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Definition: dct.c:295
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Definition: dct.c:115
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Definition: lfg.h:53
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Definition: cuda_runtime.h:35
ff_jpeg_fdct_islow_8
void ff_jpeg_fdct_islow_8(int16_t *data)
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVLFG
Context structure for the Lagged Fibonacci PRNG.
Definition: lfg.h:33
cpu.h
FF_IDCT_PERM_NONE
@ FF_IDCT_PERM_NONE
Definition: idctdsp.h:38
printf
printf("static const uint8_t my_array[100] = {\n")
algo::func
void(* func)(int16_t *block)
Definition: dct.c:56
fdct_tab_arch
static const struct algo fdct_tab_arch[]
Definition: dct.c:108
faanidct.h
dct.c
M_PI
#define M_PI
Definition: mathematics.h:52
help
static void help(void)
Definition: dct.c:452
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:116
permute_x86
static int permute_x86(int16_t dst[64], const int16_t src[64], enum idct_permutation_type perm_type)
Definition: dct.c:109
ff_simple_idct_int16_8bit
void ff_simple_idct_int16_8bit(int16_t *block)
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
permute
static void permute(int16_t dst[64], const int16_t src[64], enum idct_permutation_type perm_type)
Definition: dct.c:150
fdct_tab
static const struct algo fdct_tab[]
Definition: dct.c:62
algo
Definition: dct.c:54
internal.h
common.h
dct
static void dct(AudioRNNContext *s, float *out, const float *in)
Definition: af_arnndn.c:1012
optind
static int optind
Definition: getopt.c:37
idctdsp.h
ff_j_rev_dct
void ff_j_rev_dct(int16_t *data)
FF_IDCT_PERM_TRANSPOSE
@ FF_IDCT_PERM_TRANSPOSE
Definition: idctdsp.h:41
dct.c
idct248_error
static void idct248_error(const char *name, void(*idct248_put)(uint8_t *dest, ptrdiff_t line_size, int16_t *block), int speed)
Definition: dct.c:375
getopt.c
FF_IDCT_PERM_PARTTRANS
@ FF_IDCT_PERM_PARTTRANS
Definition: idctdsp.h:42
ff_simple_idct_int16_12bit
void ff_simple_idct_int16_12bit(int16_t *block)
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:112
ff_ref_fdct
void ff_ref_fdct(short *block)
Transform 8x8 block of data with a double precision forward DCT This is a reference implementation.
Definition: dctref.c:59
idct_tab_arch
static const struct algo idct_tab_arch[]
Definition: dct.c:109
ff_prores_idct_10
void ff_prores_idct_10(int16_t *block, const int16_t *qmat)
Special version of ff_simple_idct_int16_10bit() which does dequantization and scales by a factor of 2...
Definition: simple_idct.c:239
idct_permutation_type
idct_permutation_type
Definition: idctdsp.h:37
AANSCALE_BITS
#define AANSCALE_BITS
Definition: dct.c:112
dctref.h
it
s EdgeDetect Foobar g libavfilter vf_edgedetect c libavfilter vf_foobar c edit libavfilter and add an entry for foobar following the pattern of the other filters edit libavfilter allfilters and add an entry for foobar following the pattern of the other filters configure make j< whatever > ffmpeg ffmpeg i you should get a foobar png with Lena edge detected That s it
Definition: writing_filters.txt:31
ff_ref_idct
void ff_ref_idct(short *block)
Transform 8x8 block of data with a double precision inverse DCT This is a reference implementation.
Definition: dctref.c:95
dct.c
algo::perm_type
enum idct_permutation_type perm_type
Definition: dct.c:57
img_dest1
static uint8_t img_dest1[64]
Definition: dct.c:293
dct_error
static int dct_error(const struct algo *dct, int test, int is_idct, int speed, const int bits)
Definition: dct.c:180
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
algo::name
const char * name
Definition: dct.c:55
dct.c
int
int
Definition: ffmpeg_filter.c:155
block
static int16_t block[64]
Definition: dct.c:117
block1
static int16_t block1[64]
Definition: dct.c:118
FF_IDCT_PERM_LIBMPEG2
@ FF_IDCT_PERM_LIBMPEG2
Definition: idctdsp.h:39
ff_aanscales
const uint16_t ff_aanscales[64]
Definition: aandcttab.c:26