Libav
mpeg4videodec.c
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1 /*
2  * MPEG4 decoder.
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 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 #include "error_resilience.h"
24 #include "internal.h"
25 #include "mpegvideo.h"
26 #include "mpeg4video.h"
27 #include "h263.h"
28 #include "thread.h"
29 
30 /* The defines below define the number of bits that are read at once for
31  * reading vlc values. Changing these may improve speed and data cache needs
32  * be aware though that decreasing them may need the number of stages that is
33  * passed to get_vlc* to be increased. */
34 #define SPRITE_TRAJ_VLC_BITS 6
35 #define DC_VLC_BITS 9
36 #define MB_TYPE_B_VLC_BITS 4
37 
41 
42 static const int mb_type_b_map[4] = {
47 };
48 
54 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
55 {
56  int i;
57  int16_t *ac_val, *ac_val1;
58  int8_t *const qscale_table = s->current_picture.qscale_table;
59 
60  /* find prediction */
61  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
62  ac_val1 = ac_val;
63  if (s->ac_pred) {
64  if (dir == 0) {
65  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
66  /* left prediction */
67  ac_val -= 16;
68 
69  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
70  n == 1 || n == 3) {
71  /* same qscale */
72  for (i = 1; i < 8; i++)
73  block[s->dsp.idct_permutation[i << 3]] += ac_val[i];
74  } else {
75  /* different qscale, we must rescale */
76  for (i = 1; i < 8; i++)
77  block[s->dsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
78  }
79  } else {
80  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
81  /* top prediction */
82  ac_val -= 16 * s->block_wrap[n];
83 
84  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
85  n == 2 || n == 3) {
86  /* same qscale */
87  for (i = 1; i < 8; i++)
88  block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
89  } else {
90  /* different qscale, we must rescale */
91  for (i = 1; i < 8; i++)
92  block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
93  }
94  }
95  }
96  /* left copy */
97  for (i = 1; i < 8; i++)
98  ac_val1[i] = block[s->dsp.idct_permutation[i << 3]];
99 
100  /* top copy */
101  for (i = 1; i < 8; i++)
102  ac_val1[8 + i] = block[s->dsp.idct_permutation[i]];
103 }
104 
109 static inline int mpeg4_is_resync(MpegEncContext *s)
110 {
111  int bits_count = get_bits_count(&s->gb);
112  int v = show_bits(&s->gb, 16);
113 
115  return 0;
116 
117  while (v <= 0xFF) {
118  if (s->pict_type == AV_PICTURE_TYPE_B ||
119  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
120  break;
121  skip_bits(&s->gb, 8 + s->pict_type);
122  bits_count += 8 + s->pict_type;
123  v = show_bits(&s->gb, 16);
124  }
125 
126  if (bits_count + 8 >= s->gb.size_in_bits) {
127  v >>= 8;
128  v |= 0x7F >> (7 - (bits_count & 7));
129 
130  if (v == 0x7F)
131  return 1;
132  } else {
133  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
134  int len;
135  GetBitContext gb = s->gb;
136 
137  skip_bits(&s->gb, 1);
138  align_get_bits(&s->gb);
139 
140  for (len = 0; len < 32; len++)
141  if (get_bits1(&s->gb))
142  break;
143 
144  s->gb = gb;
145 
147  return 1;
148  }
149  }
150  return 0;
151 }
152 
154 {
155  MpegEncContext *s = &ctx->m;
156  int a = 2 << s->sprite_warping_accuracy;
157  int rho = 3 - s->sprite_warping_accuracy;
158  int r = 16 / a;
159  int alpha = 0;
160  int beta = 0;
161  int w = s->width;
162  int h = s->height;
163  int min_ab, i, w2, h2, w3, h3;
164  int sprite_ref[4][2];
165  int virtual_ref[2][2];
166 
167  // only true for rectangle shapes
168  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
169  { 0, s->height }, { s->width, s->height } };
170  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
171 
172  if (w <= 0 || h <= 0)
173  return AVERROR_INVALIDDATA;
174 
175  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
176  int length;
177  int x = 0, y = 0;
178 
179  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
180  if (length)
181  x = get_xbits(gb, length);
182 
183  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
184  skip_bits1(gb); /* marker bit */
185 
186  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
187  if (length)
188  y = get_xbits(gb, length);
189 
190  skip_bits1(gb); /* marker bit */
191  ctx->sprite_traj[i][0] = d[i][0] = x;
192  ctx->sprite_traj[i][1] = d[i][1] = y;
193  }
194  for (; i < 4; i++)
195  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
196 
197  while ((1 << alpha) < w)
198  alpha++;
199  while ((1 << beta) < h)
200  beta++; /* typo in the mpeg4 std for the definition of w' and h' */
201  w2 = 1 << alpha;
202  h2 = 1 << beta;
203 
204  // Note, the 4th point isn't used for GMC
205  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
206  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
207  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
208  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
209  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
210  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
211  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
212  } else {
213  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
214  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
215  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
216  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
217  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
218  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
219  }
220  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
221  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
222 
223  /* this is mostly identical to the mpeg4 std (and is totally unreadable
224  * because of that...). Perhaps it should be reordered to be more readable.
225  * The idea behind this virtual_ref mess is to be able to use shifts later
226  * per pixel instead of divides so the distance between points is converted
227  * from w&h based to w2&h2 based which are of the 2^x form. */
228  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
229  ROUNDED_DIV(((w - w2) *
230  (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
231  w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
232  virtual_ref[0][1] = 16 * vop_ref[0][1] +
233  ROUNDED_DIV(((w - w2) *
234  (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
235  w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
236  virtual_ref[1][0] = 16 * vop_ref[0][0] +
237  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
238  h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
239  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
240  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
241  h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
242 
243  switch (ctx->num_sprite_warping_points) {
244  case 0:
245  s->sprite_offset[0][0] =
246  s->sprite_offset[0][1] =
247  s->sprite_offset[1][0] =
248  s->sprite_offset[1][1] = 0;
249  s->sprite_delta[0][0] = a;
250  s->sprite_delta[0][1] =
251  s->sprite_delta[1][0] = 0;
252  s->sprite_delta[1][1] = a;
253  ctx->sprite_shift[0] =
254  ctx->sprite_shift[1] = 0;
255  break;
256  case 1: // GMC only
257  s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
258  s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
259  s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
260  a * (vop_ref[0][0] / 2);
261  s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
262  a * (vop_ref[0][1] / 2);
263  s->sprite_delta[0][0] = a;
264  s->sprite_delta[0][1] =
265  s->sprite_delta[1][0] = 0;
266  s->sprite_delta[1][1] = a;
267  ctx->sprite_shift[0] =
268  ctx->sprite_shift[1] = 0;
269  break;
270  case 2:
271  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
272  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
273  (-vop_ref[0][0]) +
274  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
275  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
276  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
277  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
278  (-vop_ref[0][0]) +
279  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
280  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
281  s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
282  (-2 * vop_ref[0][0] + 1) +
283  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
284  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
285  sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
286  s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
287  (-2 * vop_ref[0][0] + 1) +
288  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
289  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
290  sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
291  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
292  s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
293  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
294  s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
295 
296  ctx->sprite_shift[0] = alpha + rho;
297  ctx->sprite_shift[1] = alpha + rho + 2;
298  break;
299  case 3:
300  min_ab = FFMIN(alpha, beta);
301  w3 = w2 >> min_ab;
302  h3 = h2 >> min_ab;
303  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
304  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
305  h3 * (-vop_ref[0][0]) +
306  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
307  w3 * (-vop_ref[0][1]) +
308  (1 << (alpha + beta + rho - min_ab - 1));
309  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
310  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
311  h3 * (-vop_ref[0][0]) +
312  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
313  w3 * (-vop_ref[0][1]) +
314  (1 << (alpha + beta + rho - min_ab - 1));
315  s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
316  h3 * (-2 * vop_ref[0][0] + 1) +
317  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
318  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
319  r * sprite_ref[0][0] - 16 * w2 * h3 +
320  (1 << (alpha + beta + rho - min_ab + 1));
321  s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
322  h3 * (-2 * vop_ref[0][0] + 1) +
323  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
324  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
325  r * sprite_ref[0][1] - 16 * w2 * h3 +
326  (1 << (alpha + beta + rho - min_ab + 1));
327  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
328  s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
329  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
330  s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
331 
332  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
333  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
334  break;
335  }
336  /* try to simplify the situation */
337  if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
338  s->sprite_delta[0][1] == 0 &&
339  s->sprite_delta[1][0] == 0 &&
340  s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
341  s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
342  s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
343  s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
344  s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
345  s->sprite_delta[0][0] = a;
346  s->sprite_delta[0][1] = 0;
347  s->sprite_delta[1][0] = 0;
348  s->sprite_delta[1][1] = a;
349  ctx->sprite_shift[0] = 0;
350  ctx->sprite_shift[1] = 0;
352  } else {
353  int shift_y = 16 - ctx->sprite_shift[0];
354  int shift_c = 16 - ctx->sprite_shift[1];
355  for (i = 0; i < 2; i++) {
356  s->sprite_offset[0][i] <<= shift_y;
357  s->sprite_offset[1][i] <<= shift_c;
358  s->sprite_delta[0][i] <<= shift_y;
359  s->sprite_delta[1][i] <<= shift_y;
360  ctx->sprite_shift[i] = 16;
361  }
363  }
364 
365  return 0;
366 }
367 
373 {
374  MpegEncContext *s = &ctx->m;
375 
376  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
377  int header_extension = 0, mb_num, len;
378 
379  /* is there enough space left for a video packet + header */
380  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
381  return -1;
382 
383  for (len = 0; len < 32; len++)
384  if (get_bits1(&s->gb))
385  break;
386 
388  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
389  return -1;
390  }
391 
392  if (ctx->shape != RECT_SHAPE) {
393  header_extension = get_bits1(&s->gb);
394  // FIXME more stuff here
395  }
396 
397  mb_num = get_bits(&s->gb, mb_num_bits);
398  if (mb_num >= s->mb_num) {
400  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
401  return -1;
402  }
403  if (s->pict_type == AV_PICTURE_TYPE_B) {
404  int mb_x = 0, mb_y = 0;
405 
406  while (s->next_picture.mbskip_table[s->mb_index2xy[mb_num]]) {
407  if (!mb_x)
409  mb_num++;
410  if (++mb_x == s->mb_width)
411  mb_x = 0;
412  }
413  if (mb_num >= s->mb_num)
414  return -1; // slice contains just skipped MBs (already decoded)
415  }
416 
417  s->mb_x = mb_num % s->mb_width;
418  s->mb_y = mb_num / s->mb_width;
419 
420  if (ctx->shape != BIN_ONLY_SHAPE) {
421  int qscale = get_bits(&s->gb, s->quant_precision);
422  if (qscale)
423  s->chroma_qscale = s->qscale = qscale;
424  }
425 
426  if (ctx->shape == RECT_SHAPE)
427  header_extension = get_bits1(&s->gb);
428 
429  if (header_extension) {
430  int time_incr = 0;
431 
432  while (get_bits1(&s->gb) != 0)
433  time_incr++;
434 
435  check_marker(&s->gb, "before time_increment in video packed header");
436  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
437  check_marker(&s->gb, "before vop_coding_type in video packed header");
438 
439  skip_bits(&s->gb, 2); /* vop coding type */
440  // FIXME not rect stuff here
441 
442  if (ctx->shape != BIN_ONLY_SHAPE) {
443  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
444  // FIXME don't just ignore everything
445  if (s->pict_type == AV_PICTURE_TYPE_S &&
446  ctx->vol_sprite_usage == GMC_SPRITE) {
447  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
448  return AVERROR_INVALIDDATA;
449  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
450  }
451 
452  // FIXME reduced res stuff here
453 
454  if (s->pict_type != AV_PICTURE_TYPE_I) {
455  int f_code = get_bits(&s->gb, 3); /* fcode_for */
456  if (f_code == 0)
458  "Error, video packet header damaged (f_code=0)\n");
459  }
460  if (s->pict_type == AV_PICTURE_TYPE_B) {
461  int b_code = get_bits(&s->gb, 3);
462  if (b_code == 0)
464  "Error, video packet header damaged (b_code=0)\n");
465  }
466  }
467  }
468  // FIXME new-pred stuff
469 
470  return 0;
471 }
472 
478 static inline int get_amv(Mpeg4DecContext *ctx, int n)
479 {
480  MpegEncContext *s = &ctx->m;
481  int x, y, mb_v, sum, dx, dy, shift;
482  int len = 1 << (s->f_code + 4);
483  const int a = s->sprite_warping_accuracy;
484 
485  if (s->workaround_bugs & FF_BUG_AMV)
486  len >>= s->quarter_sample;
487 
488  if (s->real_sprite_warping_points == 1) {
489  if (ctx->divx_version == 500 && ctx->divx_build == 413)
490  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
491  else
492  sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
493  } else {
494  dx = s->sprite_delta[n][0];
495  dy = s->sprite_delta[n][1];
496  shift = ctx->sprite_shift[0];
497  if (n)
498  dy -= 1 << (shift + a + 1);
499  else
500  dx -= 1 << (shift + a + 1);
501  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
502 
503  sum = 0;
504  for (y = 0; y < 16; y++) {
505  int v;
506 
507  v = mb_v + dy * y;
508  // FIXME optimize
509  for (x = 0; x < 16; x++) {
510  sum += v >> shift;
511  v += dx;
512  }
513  }
514  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
515  }
516 
517  if (sum < -len)
518  sum = -len;
519  else if (sum >= len)
520  sum = len - 1;
521 
522  return sum;
523 }
524 
531 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
532 {
533  int level, code;
534 
535  if (n < 4)
536  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
537  else
538  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
539 
540  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
541  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
542  return -1;
543  }
544 
545  if (code == 0) {
546  level = 0;
547  } else {
548  if (IS_3IV1) {
549  if (code == 1)
550  level = 2 * get_bits1(&s->gb) - 1;
551  else {
552  if (get_bits1(&s->gb))
553  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
554  else
555  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
556  }
557  } else {
558  level = get_xbits(&s->gb, code);
559  }
560 
561  if (code > 8) {
562  if (get_bits1(&s->gb) == 0) { /* marker */
563  if (s->err_recognition & AV_EF_BITSTREAM) {
564  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
565  return -1;
566  }
567  }
568  }
569  }
570 
571  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
572 }
573 
579 {
580  MpegEncContext *s = &ctx->m;
581  int mb_num = 0;
582  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
583 
584  /* decode first partition */
585  s->first_slice_line = 1;
586  for (; s->mb_y < s->mb_height; s->mb_y++) {
588  for (; s->mb_x < s->mb_width; s->mb_x++) {
589  const int xy = s->mb_x + s->mb_y * s->mb_stride;
590  int cbpc;
591  int dir = 0;
592 
593  mb_num++;
595  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
596  s->first_slice_line = 0;
597 
598  if (s->pict_type == AV_PICTURE_TYPE_I) {
599  int i;
600 
601  do {
602  if (show_bits_long(&s->gb, 19) == DC_MARKER)
603  return mb_num - 1;
604 
606  if (cbpc < 0) {
608  "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
609  return -1;
610  }
611  } while (cbpc == 8);
612 
613  s->cbp_table[xy] = cbpc & 3;
615  s->mb_intra = 1;
616 
617  if (cbpc & 4)
618  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
619 
620  s->current_picture.qscale_table[xy] = s->qscale;
621 
622  s->mbintra_table[xy] = 1;
623  for (i = 0; i < 6; i++) {
624  int dc_pred_dir;
625  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
626  if (dc < 0) {
628  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
629  return -1;
630  }
631  dir <<= 1;
632  if (dc_pred_dir)
633  dir |= 1;
634  }
635  s->pred_dir_table[xy] = dir;
636  } else { /* P/S_TYPE */
637  int mx, my, pred_x, pred_y, bits;
638  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
639  const int stride = s->b8_stride * 2;
640 
641 try_again:
642  bits = show_bits(&s->gb, 17);
643  if (bits == MOTION_MARKER)
644  return mb_num - 1;
645 
646  skip_bits1(&s->gb);
647  if (bits & 0x10000) {
648  /* skip mb */
649  if (s->pict_type == AV_PICTURE_TYPE_S &&
650  ctx->vol_sprite_usage == GMC_SPRITE) {
652  MB_TYPE_16x16 |
653  MB_TYPE_GMC |
654  MB_TYPE_L0;
655  mx = get_amv(ctx, 0);
656  my = get_amv(ctx, 1);
657  } else {
659  MB_TYPE_16x16 |
660  MB_TYPE_L0;
661  mx = my = 0;
662  }
663  mot_val[0] =
664  mot_val[2] =
665  mot_val[0 + stride] =
666  mot_val[2 + stride] = mx;
667  mot_val[1] =
668  mot_val[3] =
669  mot_val[1 + stride] =
670  mot_val[3 + stride] = my;
671 
672  if (s->mbintra_table[xy])
674  continue;
675  }
676 
678  if (cbpc < 0) {
680  "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
681  return -1;
682  }
683  if (cbpc == 20)
684  goto try_again;
685 
686  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
687 
688  s->mb_intra = ((cbpc & 4) != 0);
689 
690  if (s->mb_intra) {
692  s->mbintra_table[xy] = 1;
693  mot_val[0] =
694  mot_val[2] =
695  mot_val[0 + stride] =
696  mot_val[2 + stride] = 0;
697  mot_val[1] =
698  mot_val[3] =
699  mot_val[1 + stride] =
700  mot_val[3 + stride] = 0;
701  } else {
702  if (s->mbintra_table[xy])
704 
705  if (s->pict_type == AV_PICTURE_TYPE_S &&
706  ctx->vol_sprite_usage == GMC_SPRITE &&
707  (cbpc & 16) == 0)
708  s->mcsel = get_bits1(&s->gb);
709  else
710  s->mcsel = 0;
711 
712  if ((cbpc & 16) == 0) {
713  /* 16x16 motion prediction */
714 
715  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
716  if (!s->mcsel) {
717  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
718  if (mx >= 0xffff)
719  return -1;
720 
721  my = ff_h263_decode_motion(s, pred_y, s->f_code);
722  if (my >= 0xffff)
723  return -1;
725  MB_TYPE_L0;
726  } else {
727  mx = get_amv(ctx, 0);
728  my = get_amv(ctx, 1);
730  MB_TYPE_GMC |
731  MB_TYPE_L0;
732  }
733 
734  mot_val[0] =
735  mot_val[2] =
736  mot_val[0 + stride] =
737  mot_val[2 + stride] = mx;
738  mot_val[1] =
739  mot_val[3] =
740  mot_val[1 + stride] =
741  mot_val[3 + stride] = my;
742  } else {
743  int i;
745  MB_TYPE_L0;
746  for (i = 0; i < 4; i++) {
747  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
748  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
749  if (mx >= 0xffff)
750  return -1;
751 
752  my = ff_h263_decode_motion(s, pred_y, s->f_code);
753  if (my >= 0xffff)
754  return -1;
755  mot_val[0] = mx;
756  mot_val[1] = my;
757  }
758  }
759  }
760  }
761  }
762  s->mb_x = 0;
763  }
764 
765  return mb_num;
766 }
767 
772 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
773 {
774  int mb_num = 0;
775  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
776 
777  s->mb_x = s->resync_mb_x;
778  s->first_slice_line = 1;
779  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
781  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
782  const int xy = s->mb_x + s->mb_y * s->mb_stride;
783 
784  mb_num++;
786  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
787  s->first_slice_line = 0;
788 
789  if (s->pict_type == AV_PICTURE_TYPE_I) {
790  int ac_pred = get_bits1(&s->gb);
791  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
792  if (cbpy < 0) {
794  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
795  return -1;
796  }
797 
798  s->cbp_table[xy] |= cbpy << 2;
799  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
800  } else { /* P || S_TYPE */
801  if (IS_INTRA(s->current_picture.mb_type[xy])) {
802  int i;
803  int dir = 0;
804  int ac_pred = get_bits1(&s->gb);
805  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
806 
807  if (cbpy < 0) {
809  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
810  return -1;
811  }
812 
813  if (s->cbp_table[xy] & 8)
814  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
815  s->current_picture.qscale_table[xy] = s->qscale;
816 
817  for (i = 0; i < 6; i++) {
818  int dc_pred_dir;
819  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
820  if (dc < 0) {
822  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
823  return -1;
824  }
825  dir <<= 1;
826  if (dc_pred_dir)
827  dir |= 1;
828  }
829  s->cbp_table[xy] &= 3; // remove dquant
830  s->cbp_table[xy] |= cbpy << 2;
831  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
832  s->pred_dir_table[xy] = dir;
833  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
834  s->current_picture.qscale_table[xy] = s->qscale;
835  s->cbp_table[xy] = 0;
836  } else {
837  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
838 
839  if (cbpy < 0) {
841  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
842  return -1;
843  }
844 
845  if (s->cbp_table[xy] & 8)
846  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
847  s->current_picture.qscale_table[xy] = s->qscale;
848 
849  s->cbp_table[xy] &= 3; // remove dquant
850  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
851  }
852  }
853  }
854  if (mb_num >= mb_count)
855  return 0;
856  s->mb_x = 0;
857  }
858  return 0;
859 }
860 
866 {
867  MpegEncContext *s = &ctx->m;
868  int mb_num;
869  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
870  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
871 
872  mb_num = mpeg4_decode_partition_a(ctx);
873  if (mb_num < 0) {
875  s->mb_x, s->mb_y, part_a_error);
876  return -1;
877  }
878 
879  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
880  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
882  s->mb_x, s->mb_y, part_a_error);
883  return -1;
884  }
885 
886  s->mb_num_left = mb_num;
887 
888  if (s->pict_type == AV_PICTURE_TYPE_I) {
889  while (show_bits(&s->gb, 9) == 1)
890  skip_bits(&s->gb, 9);
891  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
893  "marker missing after first I partition at %d %d\n",
894  s->mb_x, s->mb_y);
895  return -1;
896  }
897  } else {
898  while (show_bits(&s->gb, 10) == 1)
899  skip_bits(&s->gb, 10);
900  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
902  "marker missing after first P partition at %d %d\n",
903  s->mb_x, s->mb_y);
904  return -1;
905  }
906  }
908  s->mb_x - 1, s->mb_y, part_a_end);
909 
910  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
911  if (s->pict_type == AV_PICTURE_TYPE_P)
913  s->mb_x, s->mb_y, ER_DC_ERROR);
914  return -1;
915  } else {
916  if (s->pict_type == AV_PICTURE_TYPE_P)
918  s->mb_x - 1, s->mb_y, ER_DC_END);
919  }
920 
921  return 0;
922 }
923 
928 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
929  int n, int coded, int intra, int rvlc)
930 {
931  MpegEncContext *s = &ctx->m;
932  int level, i, last, run, qmul, qadd, dc_pred_dir;
933  RLTable *rl;
934  RL_VLC_ELEM *rl_vlc;
935  const uint8_t *scan_table;
936 
937  // Note intra & rvlc should be optimized away if this is inlined
938 
939  if (intra) {
940  if (ctx->use_intra_dc_vlc) {
941  /* DC coef */
942  if (s->partitioned_frame) {
943  level = s->dc_val[0][s->block_index[n]];
944  if (n < 4)
945  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
946  else
947  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
948  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
949  } else {
950  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
951  if (level < 0)
952  return -1;
953  }
954  block[0] = level;
955  i = 0;
956  } else {
957  i = -1;
958  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
959  }
960  if (!coded)
961  goto not_coded;
962 
963  if (rvlc) {
964  rl = &ff_rvlc_rl_intra;
965  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
966  } else {
967  rl = &ff_mpeg4_rl_intra;
968  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
969  }
970  if (s->ac_pred) {
971  if (dc_pred_dir == 0)
972  scan_table = s->intra_v_scantable.permutated; /* left */
973  else
974  scan_table = s->intra_h_scantable.permutated; /* top */
975  } else {
976  scan_table = s->intra_scantable.permutated;
977  }
978  qmul = 1;
979  qadd = 0;
980  } else {
981  i = -1;
982  if (!coded) {
983  s->block_last_index[n] = i;
984  return 0;
985  }
986  if (rvlc)
987  rl = &ff_rvlc_rl_inter;
988  else
989  rl = &ff_h263_rl_inter;
990 
991  scan_table = s->intra_scantable.permutated;
992 
993  if (s->mpeg_quant) {
994  qmul = 1;
995  qadd = 0;
996  if (rvlc)
997  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
998  else
999  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1000  } else {
1001  qmul = s->qscale << 1;
1002  qadd = (s->qscale - 1) | 1;
1003  if (rvlc)
1004  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1005  else
1006  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1007  }
1008  }
1009  {
1010  OPEN_READER(re, &s->gb);
1011  for (;;) {
1012  UPDATE_CACHE(re, &s->gb);
1013  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1014  if (level == 0) {
1015  /* escape */
1016  if (rvlc) {
1017  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1019  "1. marker bit missing in rvlc esc\n");
1020  return -1;
1021  }
1022  SKIP_CACHE(re, &s->gb, 1);
1023 
1024  last = SHOW_UBITS(re, &s->gb, 1);
1025  SKIP_CACHE(re, &s->gb, 1);
1026  run = SHOW_UBITS(re, &s->gb, 6);
1027  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1028  UPDATE_CACHE(re, &s->gb);
1029 
1030  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1032  "2. marker bit missing in rvlc esc\n");
1033  return -1;
1034  }
1035  SKIP_CACHE(re, &s->gb, 1);
1036 
1037  level = SHOW_UBITS(re, &s->gb, 11);
1038  SKIP_CACHE(re, &s->gb, 11);
1039 
1040  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1041  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1042  return -1;
1043  }
1044  SKIP_CACHE(re, &s->gb, 5);
1045 
1046  level = level * qmul + qadd;
1047  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1048  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1049 
1050  i += run + 1;
1051  if (last)
1052  i += 192;
1053  } else {
1054  int cache;
1055  cache = GET_CACHE(re, &s->gb);
1056 
1057  if (IS_3IV1)
1058  cache ^= 0xC0000000;
1059 
1060  if (cache & 0x80000000) {
1061  if (cache & 0x40000000) {
1062  /* third escape */
1063  SKIP_CACHE(re, &s->gb, 2);
1064  last = SHOW_UBITS(re, &s->gb, 1);
1065  SKIP_CACHE(re, &s->gb, 1);
1066  run = SHOW_UBITS(re, &s->gb, 6);
1067  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1068  UPDATE_CACHE(re, &s->gb);
1069 
1070  if (IS_3IV1) {
1071  level = SHOW_SBITS(re, &s->gb, 12);
1072  LAST_SKIP_BITS(re, &s->gb, 12);
1073  } else {
1074  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1076  "1. marker bit missing in 3. esc\n");
1077  return -1;
1078  }
1079  SKIP_CACHE(re, &s->gb, 1);
1080 
1081  level = SHOW_SBITS(re, &s->gb, 12);
1082  SKIP_CACHE(re, &s->gb, 12);
1083 
1084  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1086  "2. marker bit missing in 3. esc\n");
1087  return -1;
1088  }
1089 
1090  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1091  }
1092 
1093  if (level > 0)
1094  level = level * qmul + qadd;
1095  else
1096  level = level * qmul - qadd;
1097 
1098  if ((unsigned)(level + 2048) > 4095) {
1099  if (s->err_recognition & AV_EF_BITSTREAM) {
1100  if (level > 2560 || level < -2560) {
1102  "|level| overflow in 3. esc, qp=%d\n",
1103  s->qscale);
1104  return -1;
1105  }
1106  }
1107  level = level < 0 ? -2048 : 2047;
1108  }
1109 
1110  i += run + 1;
1111  if (last)
1112  i += 192;
1113  } else {
1114  /* second escape */
1115  SKIP_BITS(re, &s->gb, 2);
1116  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1117  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1118  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1119  LAST_SKIP_BITS(re, &s->gb, 1);
1120  }
1121  } else {
1122  /* first escape */
1123  SKIP_BITS(re, &s->gb, 1);
1124  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1125  i += run;
1126  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1127  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1128  LAST_SKIP_BITS(re, &s->gb, 1);
1129  }
1130  }
1131  } else {
1132  i += run;
1133  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1134  LAST_SKIP_BITS(re, &s->gb, 1);
1135  }
1136  if (i > 62) {
1137  i -= 192;
1138  if (i & (~63)) {
1140  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1141  return -1;
1142  }
1143 
1144  block[scan_table[i]] = level;
1145  break;
1146  }
1147 
1148  block[scan_table[i]] = level;
1149  }
1150  CLOSE_READER(re, &s->gb);
1151  }
1152 
1153 not_coded:
1154  if (intra) {
1155  if (!ctx->use_intra_dc_vlc) {
1156  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1157 
1158  i -= i >> 31; // if (i == -1) i = 0;
1159  }
1160 
1161  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1162  if (s->ac_pred)
1163  i = 63; // FIXME not optimal
1164  }
1165  s->block_last_index[n] = i;
1166  return 0;
1167 }
1168 
1173 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1174 {
1175  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1176  int cbp, mb_type;
1177  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1178 
1179  mb_type = s->current_picture.mb_type[xy];
1180  cbp = s->cbp_table[xy];
1181 
1182  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1183 
1184  if (s->current_picture.qscale_table[xy] != s->qscale)
1186 
1187  if (s->pict_type == AV_PICTURE_TYPE_P ||
1188  s->pict_type == AV_PICTURE_TYPE_S) {
1189  int i;
1190  for (i = 0; i < 4; i++) {
1191  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1192  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1193  }
1194  s->mb_intra = IS_INTRA(mb_type);
1195 
1196  if (IS_SKIP(mb_type)) {
1197  /* skip mb */
1198  for (i = 0; i < 6; i++)
1199  s->block_last_index[i] = -1;
1200  s->mv_dir = MV_DIR_FORWARD;
1201  s->mv_type = MV_TYPE_16X16;
1203  && ctx->vol_sprite_usage == GMC_SPRITE) {
1204  s->mcsel = 1;
1205  s->mb_skipped = 0;
1206  } else {
1207  s->mcsel = 0;
1208  s->mb_skipped = 1;
1209  }
1210  } else if (s->mb_intra) {
1212  } else if (!s->mb_intra) {
1213  // s->mcsel = 0; // FIXME do we need to init that?
1214 
1215  s->mv_dir = MV_DIR_FORWARD;
1216  if (IS_8X8(mb_type)) {
1217  s->mv_type = MV_TYPE_8X8;
1218  } else {
1219  s->mv_type = MV_TYPE_16X16;
1220  }
1221  }
1222  } else { /* I-Frame */
1223  s->mb_intra = 1;
1225  }
1226 
1227  if (!IS_SKIP(mb_type)) {
1228  int i;
1229  s->dsp.clear_blocks(s->block[0]);
1230  /* decode each block */
1231  for (i = 0; i < 6; i++) {
1232  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1234  "texture corrupted at %d %d %d\n",
1235  s->mb_x, s->mb_y, s->mb_intra);
1236  return -1;
1237  }
1238  cbp += cbp;
1239  }
1240  }
1241 
1242  /* per-MB end of slice check */
1243  if (--s->mb_num_left <= 0) {
1244  if (mpeg4_is_resync(s))
1245  return SLICE_END;
1246  else
1247  return SLICE_NOEND;
1248  } else {
1249  if (mpeg4_is_resync(s)) {
1250  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1251  if (s->cbp_table[xy + delta])
1252  return SLICE_END;
1253  }
1254  return SLICE_OK;
1255  }
1256 }
1257 
1258 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1259 {
1260  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1261  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1262  int16_t *mot_val;
1263  static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1264  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1265 
1266  assert(s->h263_pred);
1267 
1268  if (s->pict_type == AV_PICTURE_TYPE_P ||
1269  s->pict_type == AV_PICTURE_TYPE_S) {
1270  do {
1271  if (get_bits1(&s->gb)) {
1272  /* skip mb */
1273  s->mb_intra = 0;
1274  for (i = 0; i < 6; i++)
1275  s->block_last_index[i] = -1;
1276  s->mv_dir = MV_DIR_FORWARD;
1277  s->mv_type = MV_TYPE_16X16;
1278  if (s->pict_type == AV_PICTURE_TYPE_S &&
1279  ctx->vol_sprite_usage == GMC_SPRITE) {
1281  MB_TYPE_GMC |
1282  MB_TYPE_16x16 |
1283  MB_TYPE_L0;
1284  s->mcsel = 1;
1285  s->mv[0][0][0] = get_amv(ctx, 0);
1286  s->mv[0][0][1] = get_amv(ctx, 1);
1287  s->mb_skipped = 0;
1288  } else {
1290  MB_TYPE_16x16 |
1291  MB_TYPE_L0;
1292  s->mcsel = 0;
1293  s->mv[0][0][0] = 0;
1294  s->mv[0][0][1] = 0;
1295  s->mb_skipped = 1;
1296  }
1297  goto end;
1298  }
1300  if (cbpc < 0) {
1302  "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1303  return -1;
1304  }
1305  } while (cbpc == 20);
1306 
1307  s->dsp.clear_blocks(s->block[0]);
1308  dquant = cbpc & 8;
1309  s->mb_intra = ((cbpc & 4) != 0);
1310  if (s->mb_intra)
1311  goto intra;
1312 
1313  if (s->pict_type == AV_PICTURE_TYPE_S &&
1314  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1315  s->mcsel = get_bits1(&s->gb);
1316  else
1317  s->mcsel = 0;
1318  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1319 
1320  cbp = (cbpc & 3) | (cbpy << 2);
1321  if (dquant)
1322  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1323  if ((!s->progressive_sequence) &&
1324  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1325  s->interlaced_dct = get_bits1(&s->gb);
1326 
1327  s->mv_dir = MV_DIR_FORWARD;
1328  if ((cbpc & 16) == 0) {
1329  if (s->mcsel) {
1331  MB_TYPE_16x16 |
1332  MB_TYPE_L0;
1333  /* 16x16 global motion prediction */
1334  s->mv_type = MV_TYPE_16X16;
1335  mx = get_amv(ctx, 0);
1336  my = get_amv(ctx, 1);
1337  s->mv[0][0][0] = mx;
1338  s->mv[0][0][1] = my;
1339  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1341  MB_TYPE_L0 |
1343  /* 16x8 field motion prediction */
1344  s->mv_type = MV_TYPE_FIELD;
1345 
1346  s->field_select[0][0] = get_bits1(&s->gb);
1347  s->field_select[0][1] = get_bits1(&s->gb);
1348 
1349  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1350 
1351  for (i = 0; i < 2; i++) {
1352  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1353  if (mx >= 0xffff)
1354  return -1;
1355 
1356  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1357  if (my >= 0xffff)
1358  return -1;
1359 
1360  s->mv[0][i][0] = mx;
1361  s->mv[0][i][1] = my;
1362  }
1363  } else {
1365  /* 16x16 motion prediction */
1366  s->mv_type = MV_TYPE_16X16;
1367  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1368  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1369 
1370  if (mx >= 0xffff)
1371  return -1;
1372 
1373  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1374 
1375  if (my >= 0xffff)
1376  return -1;
1377  s->mv[0][0][0] = mx;
1378  s->mv[0][0][1] = my;
1379  }
1380  } else {
1382  s->mv_type = MV_TYPE_8X8;
1383  for (i = 0; i < 4; i++) {
1384  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1385  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1386  if (mx >= 0xffff)
1387  return -1;
1388 
1389  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1390  if (my >= 0xffff)
1391  return -1;
1392  s->mv[0][i][0] = mx;
1393  s->mv[0][i][1] = my;
1394  mot_val[0] = mx;
1395  mot_val[1] = my;
1396  }
1397  }
1398  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1399  int modb1; // first bit of modb
1400  int modb2; // second bit of modb
1401  int mb_type;
1402 
1403  s->mb_intra = 0; // B-frames never contain intra blocks
1404  s->mcsel = 0; // ... true gmc blocks
1405 
1406  if (s->mb_x == 0) {
1407  for (i = 0; i < 2; i++) {
1408  s->last_mv[i][0][0] =
1409  s->last_mv[i][0][1] =
1410  s->last_mv[i][1][0] =
1411  s->last_mv[i][1][1] = 0;
1412  }
1413 
1415  }
1416 
1417  /* if we skipped it in the future P Frame than skip it now too */
1418  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1419 
1420  if (s->mb_skipped) {
1421  /* skip mb */
1422  for (i = 0; i < 6; i++)
1423  s->block_last_index[i] = -1;
1424 
1425  s->mv_dir = MV_DIR_FORWARD;
1426  s->mv_type = MV_TYPE_16X16;
1427  s->mv[0][0][0] =
1428  s->mv[0][0][1] =
1429  s->mv[1][0][0] =
1430  s->mv[1][0][1] = 0;
1432  MB_TYPE_16x16 |
1433  MB_TYPE_L0;
1434  goto end;
1435  }
1436 
1437  modb1 = get_bits1(&s->gb);
1438  if (modb1) {
1439  // like MB_TYPE_B_DIRECT but no vectors coded
1441  cbp = 0;
1442  } else {
1443  modb2 = get_bits1(&s->gb);
1444  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1445  if (mb_type < 0) {
1446  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1447  return -1;
1448  }
1449  mb_type = mb_type_b_map[mb_type];
1450  if (modb2) {
1451  cbp = 0;
1452  } else {
1453  s->dsp.clear_blocks(s->block[0]);
1454  cbp = get_bits(&s->gb, 6);
1455  }
1456 
1457  if ((!IS_DIRECT(mb_type)) && cbp) {
1458  if (get_bits1(&s->gb))
1459  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1460  }
1461 
1462  if (!s->progressive_sequence) {
1463  if (cbp)
1464  s->interlaced_dct = get_bits1(&s->gb);
1465 
1466  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1467  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1468  mb_type &= ~MB_TYPE_16x16;
1469 
1470  if (USES_LIST(mb_type, 0)) {
1471  s->field_select[0][0] = get_bits1(&s->gb);
1472  s->field_select[0][1] = get_bits1(&s->gb);
1473  }
1474  if (USES_LIST(mb_type, 1)) {
1475  s->field_select[1][0] = get_bits1(&s->gb);
1476  s->field_select[1][1] = get_bits1(&s->gb);
1477  }
1478  }
1479  }
1480 
1481  s->mv_dir = 0;
1482  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1483  s->mv_type = MV_TYPE_16X16;
1484 
1485  if (USES_LIST(mb_type, 0)) {
1486  s->mv_dir = MV_DIR_FORWARD;
1487 
1488  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1489  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1490  s->last_mv[0][1][0] =
1491  s->last_mv[0][0][0] =
1492  s->mv[0][0][0] = mx;
1493  s->last_mv[0][1][1] =
1494  s->last_mv[0][0][1] =
1495  s->mv[0][0][1] = my;
1496  }
1497 
1498  if (USES_LIST(mb_type, 1)) {
1499  s->mv_dir |= MV_DIR_BACKWARD;
1500 
1501  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1502  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1503  s->last_mv[1][1][0] =
1504  s->last_mv[1][0][0] =
1505  s->mv[1][0][0] = mx;
1506  s->last_mv[1][1][1] =
1507  s->last_mv[1][0][1] =
1508  s->mv[1][0][1] = my;
1509  }
1510  } else if (!IS_DIRECT(mb_type)) {
1511  s->mv_type = MV_TYPE_FIELD;
1512 
1513  if (USES_LIST(mb_type, 0)) {
1514  s->mv_dir = MV_DIR_FORWARD;
1515 
1516  for (i = 0; i < 2; i++) {
1517  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1518  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1519  s->last_mv[0][i][0] =
1520  s->mv[0][i][0] = mx;
1521  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1522  }
1523  }
1524 
1525  if (USES_LIST(mb_type, 1)) {
1526  s->mv_dir |= MV_DIR_BACKWARD;
1527 
1528  for (i = 0; i < 2; i++) {
1529  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1530  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1531  s->last_mv[1][i][0] =
1532  s->mv[1][i][0] = mx;
1533  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1534  }
1535  }
1536  }
1537  }
1538 
1539  if (IS_DIRECT(mb_type)) {
1540  if (IS_SKIP(mb_type)) {
1541  mx =
1542  my = 0;
1543  } else {
1544  mx = ff_h263_decode_motion(s, 0, 1);
1545  my = ff_h263_decode_motion(s, 0, 1);
1546  }
1547 
1549  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1550  }
1551  s->current_picture.mb_type[xy] = mb_type;
1552  } else { /* I-Frame */
1553  do {
1555  if (cbpc < 0) {
1557  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1558  return -1;
1559  }
1560  } while (cbpc == 8);
1561 
1562  dquant = cbpc & 4;
1563  s->mb_intra = 1;
1564 
1565 intra:
1566  s->ac_pred = get_bits1(&s->gb);
1567  if (s->ac_pred)
1569  else
1571 
1572  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1573  if (cbpy < 0) {
1575  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1576  return -1;
1577  }
1578  cbp = (cbpc & 3) | (cbpy << 2);
1579 
1580  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1581 
1582  if (dquant)
1583  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1584 
1585  if (!s->progressive_sequence)
1586  s->interlaced_dct = get_bits1(&s->gb);
1587 
1588  s->dsp.clear_blocks(s->block[0]);
1589  /* decode each block */
1590  for (i = 0; i < 6; i++) {
1591  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1592  return -1;
1593  cbp += cbp;
1594  }
1595  goto end;
1596  }
1597 
1598  /* decode each block */
1599  for (i = 0; i < 6; i++) {
1600  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1601  return -1;
1602  cbp += cbp;
1603  }
1604 
1605 end:
1606  /* per-MB end of slice check */
1607  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1608  if (mpeg4_is_resync(s)) {
1609  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1610 
1611  if (s->pict_type == AV_PICTURE_TYPE_B &&
1612  s->next_picture.mbskip_table[xy + delta]) {
1614  (s->mb_x + delta >= s->mb_width)
1615  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1616  : s->mb_y, 0);
1617  }
1618 
1619  if (s->pict_type == AV_PICTURE_TYPE_B &&
1620  s->next_picture.mbskip_table[xy + delta])
1621  return SLICE_OK;
1622  return SLICE_END;
1623  }
1624  }
1625 
1626  return SLICE_OK;
1627 }
1628 
1630 {
1631  int hours, minutes, seconds;
1632  unsigned time_code = show_bits(gb, 18);
1633 
1634  if (time_code & 0x40) { /* marker_bit */
1635  hours = time_code >> 13;
1636  minutes = time_code >> 7 & 0x3f;
1637  seconds = time_code & 0x3f;
1638  s->time_base = seconds + 60 * (minutes + 60 * hours);
1639  skip_bits(gb, 20); /* time_code, closed_gov, broken_link */
1640  } else {
1641  av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n");
1642  }
1643 
1644  return 0;
1645 }
1646 
1648 {
1649  int profile_and_level_indication;
1650 
1651  profile_and_level_indication = get_bits(gb, 8);
1652 
1653  s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4;
1654  s->avctx->level = (profile_and_level_indication & 0x0f);
1655 
1656  // for Simple profile, level 0
1657  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1658  s->avctx->level = 0;
1659  }
1660 
1661  return 0;
1662 }
1663 
1665 {
1666  MpegEncContext *s = &ctx->m;
1667  int width, height, vo_ver_id;
1668 
1669  /* vol header */
1670  skip_bits(gb, 1); /* random access */
1671  s->vo_type = get_bits(gb, 8);
1672  if (get_bits1(gb) != 0) { /* is_ol_id */
1673  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1674  skip_bits(gb, 3); /* vo_priority */
1675  } else {
1676  vo_ver_id = 1;
1677  }
1678  s->aspect_ratio_info = get_bits(gb, 4);
1680  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1681  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1682  } else {
1684  }
1685 
1686  if ((s->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1687  int chroma_format = get_bits(gb, 2);
1688  if (chroma_format != CHROMA_420)
1689  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1690 
1691  s->low_delay = get_bits1(gb);
1692  if (get_bits1(gb)) { /* vbv parameters */
1693  get_bits(gb, 15); /* first_half_bitrate */
1694  skip_bits1(gb); /* marker */
1695  get_bits(gb, 15); /* latter_half_bitrate */
1696  skip_bits1(gb); /* marker */
1697  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1698  skip_bits1(gb); /* marker */
1699  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1700  get_bits(gb, 11); /* first_half_vbv_occupancy */
1701  skip_bits1(gb); /* marker */
1702  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1703  skip_bits1(gb); /* marker */
1704  }
1705  } else {
1706  /* is setting low delay flag only once the smartest thing to do?
1707  * low delay detection won't be overriden. */
1708  if (s->picture_number == 0)
1709  s->low_delay = 0;
1710  }
1711 
1712  ctx->shape = get_bits(gb, 2); /* vol shape */
1713  if (ctx->shape != RECT_SHAPE)
1714  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1715  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1716  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1717  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1718  }
1719 
1720  check_marker(gb, "before time_increment_resolution");
1721 
1722  s->avctx->time_base.den = get_bits(gb, 16);
1723  if (!s->avctx->time_base.den) {
1724  av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1725  s->avctx->time_base.num = 0;
1726  return -1;
1727  }
1728 
1729  ctx->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1730  if (ctx->time_increment_bits < 1)
1731  ctx->time_increment_bits = 1;
1732 
1733  check_marker(gb, "before fixed_vop_rate");
1734 
1735  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1737  else
1738  s->avctx->time_base.num = 1;
1739 
1740  ctx->t_frame = 0;
1741 
1742  if (ctx->shape != BIN_ONLY_SHAPE) {
1743  if (ctx->shape == RECT_SHAPE) {
1744  skip_bits1(gb); /* marker */
1745  width = get_bits(gb, 13);
1746  skip_bits1(gb); /* marker */
1747  height = get_bits(gb, 13);
1748  skip_bits1(gb); /* marker */
1749  if (width && height && /* they should be non zero but who knows */
1750  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1751  if (s->width && s->height &&
1752  (s->width != width || s->height != height))
1753  s->context_reinit = 1;
1754  s->width = width;
1755  s->height = height;
1756  }
1757  }
1758 
1760  s->progressive_frame = get_bits1(gb) ^ 1;
1761  s->interlaced_dct = 0;
1762  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1763  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1764  "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1765  if (vo_ver_id == 1)
1766  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1767  else
1768  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1769 
1770  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1771  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1772  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1773  ctx->vol_sprite_usage == GMC_SPRITE) {
1774  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1775  skip_bits(gb, 13); // sprite_width
1776  skip_bits1(gb); /* marker */
1777  skip_bits(gb, 13); // sprite_height
1778  skip_bits1(gb); /* marker */
1779  skip_bits(gb, 13); // sprite_left
1780  skip_bits1(gb); /* marker */
1781  skip_bits(gb, 13); // sprite_top
1782  skip_bits1(gb); /* marker */
1783  }
1784  ctx->num_sprite_warping_points = get_bits(gb, 6);
1785  if (ctx->num_sprite_warping_points > 3) {
1787  "%d sprite_warping_points\n",
1789  ctx->num_sprite_warping_points = 0;
1790  return -1;
1791  }
1792  s->sprite_warping_accuracy = get_bits(gb, 2);
1794  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1795  skip_bits1(gb); // low_latency_sprite
1796  }
1797  // FIXME sadct disable bit if verid!=1 && shape not rect
1798 
1799  if (get_bits1(gb) == 1) { /* not_8_bit */
1800  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1801  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1802  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1803  if (s->quant_precision != 5)
1805  "quant precision %d\n", s->quant_precision);
1806  } else {
1807  s->quant_precision = 5;
1808  }
1809 
1810  // FIXME a bunch of grayscale shape things
1811 
1812  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1813  int i, v;
1814 
1815  /* load default matrixes */
1816  for (i = 0; i < 64; i++) {
1817  int j = s->dsp.idct_permutation[i];
1819  s->intra_matrix[j] = v;
1820  s->chroma_intra_matrix[j] = v;
1821 
1823  s->inter_matrix[j] = v;
1824  s->chroma_inter_matrix[j] = v;
1825  }
1826 
1827  /* load custom intra matrix */
1828  if (get_bits1(gb)) {
1829  int last = 0;
1830  for (i = 0; i < 64; i++) {
1831  int j;
1832  v = get_bits(gb, 8);
1833  if (v == 0)
1834  break;
1835 
1836  last = v;
1838  s->intra_matrix[j] = last;
1839  s->chroma_intra_matrix[j] = last;
1840  }
1841 
1842  /* replicate last value */
1843  for (; i < 64; i++) {
1844  int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1845  s->intra_matrix[j] = last;
1846  s->chroma_intra_matrix[j] = last;
1847  }
1848  }
1849 
1850  /* load custom non intra matrix */
1851  if (get_bits1(gb)) {
1852  int last = 0;
1853  for (i = 0; i < 64; i++) {
1854  int j;
1855  v = get_bits(gb, 8);
1856  if (v == 0)
1857  break;
1858 
1859  last = v;
1861  s->inter_matrix[j] = v;
1862  s->chroma_inter_matrix[j] = v;
1863  }
1864 
1865  /* replicate last value */
1866  for (; i < 64; i++) {
1867  int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1868  s->inter_matrix[j] = last;
1869  s->chroma_inter_matrix[j] = last;
1870  }
1871  }
1872 
1873  // FIXME a bunch of grayscale shape things
1874  }
1875 
1876  if (vo_ver_id != 1)
1877  s->quarter_sample = get_bits1(gb);
1878  else
1879  s->quarter_sample = 0;
1880 
1881  if (!get_bits1(gb)) {
1882  int pos = get_bits_count(gb);
1883  int estimation_method = get_bits(gb, 2);
1884  if (estimation_method < 2) {
1885  if (!get_bits1(gb)) {
1886  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1887  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1888  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1889  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1890  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1891  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1892  }
1893  if (!get_bits1(gb)) {
1894  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1895  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1896  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1897  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1898  }
1899  if (!check_marker(gb, "in complexity estimation part 1")) {
1900  skip_bits_long(gb, pos - get_bits_count(gb));
1901  goto no_cplx_est;
1902  }
1903  if (!get_bits1(gb)) {
1904  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1905  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1906  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1907  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1908  }
1909  if (!get_bits1(gb)) {
1910  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1911  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1912  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1913  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1914  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1915  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1916  }
1917  if (!check_marker(gb, "in complexity estimation part 2")) {
1918  skip_bits_long(gb, pos - get_bits_count(gb));
1919  goto no_cplx_est;
1920  }
1921  if (estimation_method == 1) {
1922  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1923  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1924  }
1925  } else
1927  "Invalid Complexity estimation method %d\n",
1928  estimation_method);
1929  } else {
1930 
1931 no_cplx_est:
1934  ctx->cplx_estimation_trash_b = 0;
1935  }
1936 
1937  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1938 
1939  s->data_partitioning = get_bits1(gb);
1940  if (s->data_partitioning)
1941  ctx->rvlc = get_bits1(gb);
1942 
1943  if (vo_ver_id != 1) {
1944  ctx->new_pred = get_bits1(gb);
1945  if (ctx->new_pred) {
1946  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1947  skip_bits(gb, 2); /* requested upstream message type */
1948  skip_bits1(gb); /* newpred segment type */
1949  }
1950  if (get_bits1(gb)) // reduced_res_vop
1952  "reduced resolution VOP not supported\n");
1953  } else {
1954  ctx->new_pred = 0;
1955  }
1956 
1957  ctx->scalability = get_bits1(gb);
1958 
1959  if (ctx->scalability) {
1960  GetBitContext bak = *gb;
1961  int h_sampling_factor_n;
1962  int h_sampling_factor_m;
1963  int v_sampling_factor_n;
1964  int v_sampling_factor_m;
1965 
1966  skip_bits1(gb); // hierarchy_type
1967  skip_bits(gb, 4); /* ref_layer_id */
1968  skip_bits1(gb); /* ref_layer_sampling_dir */
1969  h_sampling_factor_n = get_bits(gb, 5);
1970  h_sampling_factor_m = get_bits(gb, 5);
1971  v_sampling_factor_n = get_bits(gb, 5);
1972  v_sampling_factor_m = get_bits(gb, 5);
1973  ctx->enhancement_type = get_bits1(gb);
1974 
1975  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
1976  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
1977  /* illegal scalability header (VERY broken encoder),
1978  * trying to workaround */
1979  ctx->scalability = 0;
1980  *gb = bak;
1981  } else
1982  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1983 
1984  // bin shape stuff FIXME
1985  }
1986  }
1987 
1988  return 0;
1989 }
1990 
1996 {
1997  MpegEncContext *s = &ctx->m;
1998  char buf[256];
1999  int i;
2000  int e;
2001  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2002  char last;
2003 
2004  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2005  if (show_bits(gb, 23) == 0)
2006  break;
2007  buf[i] = get_bits(gb, 8);
2008  }
2009  buf[i] = 0;
2010 
2011  /* divx detection */
2012  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2013  if (e < 2)
2014  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2015  if (e >= 2) {
2016  ctx->divx_version = ver;
2017  ctx->divx_build = build;
2018  s->divx_packed = e == 3 && last == 'p';
2019  if (s->divx_packed && !ctx->showed_packed_warning) {
2021  "Invalid and inefficient vfw-avi packed B frames detected\n");
2022  ctx->showed_packed_warning = 1;
2023  }
2024  }
2025 
2026  /* libavcodec detection */
2027  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2028  if (e != 4)
2029  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2030  if (e != 4) {
2031  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2032  if (e > 1)
2033  build = (ver << 16) + (ver2 << 8) + ver3;
2034  }
2035  if (e != 4) {
2036  if (strcmp(buf, "ffmpeg") == 0)
2037  ctx->lavc_build = 4600;
2038  }
2039  if (e == 4)
2040  ctx->lavc_build = build;
2041 
2042  /* Xvid detection */
2043  e = sscanf(buf, "XviD%d", &build);
2044  if (e == 1)
2045  ctx->xvid_build = build;
2046 
2047  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2048  if (s->stream_codec_tag == AV_RL32("XVID") ||
2049  s->codec_tag == AV_RL32("XVID") ||
2050  s->codec_tag == AV_RL32("XVIX") ||
2051  s->codec_tag == AV_RL32("RMP4") ||
2052  s->codec_tag == AV_RL32("ZMP4") ||
2053  s->codec_tag == AV_RL32("SIPP"))
2054  ctx->xvid_build = 0;
2055  }
2056 
2057  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2058  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2059  s->vol_control_parameters == 0)
2060  ctx->divx_version = 400; // divx 4
2061 
2062  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2063  ctx->divx_version =
2064  ctx->divx_build = -1;
2065  }
2066 
2067 #if HAVE_MMX
2068  if (ctx->xvid_build >= 0 &&
2069  s->avctx->idct_algo == FF_IDCT_AUTO &&
2072  ff_dct_common_init(s);
2073  }
2074 #endif
2075 
2076  return 0;
2077 }
2078 
2080 {
2081  MpegEncContext *s = &ctx->m;
2082  int time_incr, time_increment;
2083 
2084  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2085  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2086  s->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) {
2087  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
2088  s->low_delay = 0;
2089  }
2090 
2092  if (s->partitioned_frame)
2094  else
2096 
2097  time_incr = 0;
2098  while (get_bits1(gb) != 0)
2099  time_incr++;
2100 
2101  check_marker(gb, "before time_increment");
2102 
2103  if (ctx->time_increment_bits == 0 ||
2104  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2106  "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
2107 
2108  for (ctx->time_increment_bits = 1;
2109  ctx->time_increment_bits < 16;
2110  ctx->time_increment_bits++) {
2111  if (s->pict_type == AV_PICTURE_TYPE_P ||
2112  (s->pict_type == AV_PICTURE_TYPE_S &&
2113  ctx->vol_sprite_usage == GMC_SPRITE)) {
2114  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2115  break;
2116  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2117  break;
2118  }
2119 
2121  "my guess is %d bits ;)\n", ctx->time_increment_bits);
2122  }
2123 
2124  if (IS_3IV1)
2125  time_increment = get_bits1(gb); // FIXME investigate further
2126  else
2127  time_increment = get_bits(gb, ctx->time_increment_bits);
2128 
2129  if (s->pict_type != AV_PICTURE_TYPE_B) {
2130  s->last_time_base = s->time_base;
2131  s->time_base += time_incr;
2132  s->time = s->time_base * s->avctx->time_base.den + time_increment;
2133  if (s->workaround_bugs & FF_BUG_UMP4) {
2134  if (s->time < s->last_non_b_time) {
2135  /* header is not mpeg-4-compatible, broken encoder,
2136  * trying to workaround */
2137  s->time_base++;
2138  s->time += s->avctx->time_base.den;
2139  }
2140  }
2141  s->pp_time = s->time - s->last_non_b_time;
2142  s->last_non_b_time = s->time;
2143  } else {
2144  s->time = (s->last_time_base + time_incr) * s->avctx->time_base.den + time_increment;
2145  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2146  if (s->pp_time <= s->pb_time ||
2147  s->pp_time <= s->pp_time - s->pb_time ||
2148  s->pp_time <= 0) {
2149  /* messed up order, maybe after seeking? skipping current b-frame */
2150  return FRAME_SKIPPED;
2151  }
2153 
2154  if (ctx->t_frame == 0)
2155  ctx->t_frame = s->pb_time;
2156  if (ctx->t_frame == 0)
2157  ctx->t_frame = 1; // 1/0 protection
2159  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2160  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2161  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2162  if (!s->progressive_sequence) {
2163  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
2164  return FRAME_SKIPPED;
2165  }
2166  }
2167 
2168  check_marker(gb, "before vop_coded");
2169 
2170  /* vop coded */
2171  if (get_bits1(gb) != 1) {
2172  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2173  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2174  return FRAME_SKIPPED;
2175  }
2176  if (ctx->shape != BIN_ONLY_SHAPE &&
2177  (s->pict_type == AV_PICTURE_TYPE_P ||
2178  (s->pict_type == AV_PICTURE_TYPE_S &&
2179  ctx->vol_sprite_usage == GMC_SPRITE))) {
2180  /* rounding type for motion estimation */
2181  s->no_rounding = get_bits1(gb);
2182  } else {
2183  s->no_rounding = 0;
2184  }
2185  // FIXME reduced res stuff
2186 
2187  if (ctx->shape != RECT_SHAPE) {
2188  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2189  skip_bits(gb, 13); /* width */
2190  skip_bits1(gb); /* marker */
2191  skip_bits(gb, 13); /* height */
2192  skip_bits1(gb); /* marker */
2193  skip_bits(gb, 13); /* hor_spat_ref */
2194  skip_bits1(gb); /* marker */
2195  skip_bits(gb, 13); /* ver_spat_ref */
2196  }
2197  skip_bits1(gb); /* change_CR_disable */
2198 
2199  if (get_bits1(gb) != 0)
2200  skip_bits(gb, 8); /* constant_alpha_value */
2201  }
2202 
2203  // FIXME complexity estimation stuff
2204 
2205  if (ctx->shape != BIN_ONLY_SHAPE) {
2207  if (s->pict_type != AV_PICTURE_TYPE_I)
2209  if (s->pict_type == AV_PICTURE_TYPE_B)
2211 
2213  if (!s->progressive_sequence) {
2214  s->top_field_first = get_bits1(gb);
2215  s->alternate_scan = get_bits1(gb);
2216  } else
2217  s->alternate_scan = 0;
2218  }
2219 
2220  if (s->alternate_scan) {
2225  } else {
2230  }
2231 
2232  if (s->pict_type == AV_PICTURE_TYPE_S &&
2233  (ctx->vol_sprite_usage == STATIC_SPRITE ||
2234  ctx->vol_sprite_usage == GMC_SPRITE)) {
2235  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2236  return AVERROR_INVALIDDATA;
2237  if (ctx->sprite_brightness_change)
2239  "sprite_brightness_change not supported\n");
2240  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2241  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2242  }
2243 
2244  if (ctx->shape != BIN_ONLY_SHAPE) {
2245  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2246  if (s->qscale == 0) {
2248  "Error, header damaged or not MPEG4 header (qscale=0)\n");
2249  return -1; // makes no sense to continue, as there is nothing left from the image then
2250  }
2251 
2252  if (s->pict_type != AV_PICTURE_TYPE_I) {
2253  s->f_code = get_bits(gb, 3); /* fcode_for */
2254  if (s->f_code == 0) {
2256  "Error, header damaged or not MPEG4 header (f_code=0)\n");
2257  return -1; // makes no sense to continue, as there is nothing left from the image then
2258  }
2259  } else
2260  s->f_code = 1;
2261 
2262  if (s->pict_type == AV_PICTURE_TYPE_B) {
2263  s->b_code = get_bits(gb, 3);
2264  } else
2265  s->b_code = 1;
2266 
2267  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2269  "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n",
2270  s->qscale, s->f_code, s->b_code,
2271  s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
2273  s->top_field_first, s->quarter_sample ? "q" : "h",
2276  1 - s->no_rounding, s->vo_type,
2277  s->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2280  }
2281 
2282  if (!ctx->scalability) {
2283  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2284  skip_bits1(gb); // vop shape coding type
2285  } else {
2286  if (ctx->enhancement_type) {
2287  int load_backward_shape = get_bits1(gb);
2288  if (load_backward_shape)
2290  "load backward shape isn't supported\n");
2291  }
2292  skip_bits(gb, 2); // ref_select_code
2293  }
2294  }
2295  /* detect buggy encoders which don't set the low_delay flag
2296  * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2297  * easily (although it's buggy too) */
2298  if (s->vo_type == 0 && s->vol_control_parameters == 0 &&
2299  ctx->divx_version == -1 && s->picture_number == 0) {
2301  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2302  s->low_delay = 1;
2303  }
2304 
2305  s->picture_number++; // better than pic number==0 always ;)
2306 
2307  // FIXME add short header support
2310 
2311  if (s->workaround_bugs & FF_BUG_EDGE) {
2312  s->h_edge_pos = s->width;
2313  s->v_edge_pos = s->height;
2314  }
2315  return 0;
2316 }
2317 
2325 {
2326  MpegEncContext *s = &ctx->m;
2327  unsigned startcode, v;
2328 
2329  /* search next start code */
2330  align_get_bits(gb);
2331 
2332  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2333  skip_bits(gb, 24);
2334  if (get_bits(gb, 8) == 0xF0)
2335  goto end;
2336  }
2337 
2338  startcode = 0xff;
2339  for (;;) {
2340  if (get_bits_count(gb) >= gb->size_in_bits) {
2341  if (gb->size_in_bits == 8 &&
2342  (ctx->divx_version >= 0 || ctx->xvid_build >= 0)) {
2343  av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2344  return FRAME_SKIPPED; // divx bug
2345  } else
2346  return -1; // end of stream
2347  }
2348 
2349  /* use the bits after the test */
2350  v = get_bits(gb, 8);
2351  startcode = ((startcode << 8) | v) & 0xffffffff;
2352 
2353  if ((startcode & 0xFFFFFF00) != 0x100)
2354  continue; // no startcode
2355 
2356  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2357  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2358  if (startcode <= 0x11F)
2359  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2360  else if (startcode <= 0x12F)
2361  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2362  else if (startcode <= 0x13F)
2363  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2364  else if (startcode <= 0x15F)
2365  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2366  else if (startcode <= 0x1AF)
2367  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2368  else if (startcode == 0x1B0)
2369  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2370  else if (startcode == 0x1B1)
2371  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2372  else if (startcode == 0x1B2)
2373  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2374  else if (startcode == 0x1B3)
2375  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2376  else if (startcode == 0x1B4)
2377  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2378  else if (startcode == 0x1B5)
2379  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2380  else if (startcode == 0x1B6)
2381  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2382  else if (startcode == 0x1B7)
2383  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2384  else if (startcode == 0x1B8)
2385  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2386  else if (startcode == 0x1B9)
2387  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2388  else if (startcode == 0x1BA)
2389  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2390  else if (startcode == 0x1BB)
2391  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2392  else if (startcode == 0x1BC)
2393  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2394  else if (startcode == 0x1BD)
2395  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2396  else if (startcode == 0x1BE)
2397  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2398  else if (startcode == 0x1BF)
2399  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2400  else if (startcode == 0x1C0)
2401  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2402  else if (startcode == 0x1C1)
2403  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2404  else if (startcode == 0x1C2)
2405  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2406  else if (startcode == 0x1C3)
2407  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2408  else if (startcode <= 0x1C5)
2409  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2410  else if (startcode <= 0x1FF)
2411  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2412  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2413  }
2414 
2415  if (startcode >= 0x120 && startcode <= 0x12F) {
2416  if (decode_vol_header(ctx, gb) < 0)
2417  return -1;
2418  } else if (startcode == USER_DATA_STARTCODE) {
2419  decode_user_data(ctx, gb);
2420  } else if (startcode == GOP_STARTCODE) {
2421  mpeg4_decode_gop_header(s, gb);
2422  } else if (startcode == VOS_STARTCODE) {
2424  } else if (startcode == VOP_STARTCODE) {
2425  break;
2426  }
2427 
2428  align_get_bits(gb);
2429  startcode = 0xff;
2430  }
2431 
2432 end:
2433  if (s->flags & CODEC_FLAG_LOW_DELAY)
2434  s->low_delay = 1;
2435  s->avctx->has_b_frames = !s->low_delay;
2436 
2438  if (s->codec_tag == AV_RL32("XVIX"))
2440 
2441  if (s->codec_tag == AV_RL32("UMP4"))
2443 
2444  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2446 
2447  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2449 
2450  if (ctx->xvid_build <= 3U)
2451  s->padding_bug_score = 256 * 256 * 256 * 64;
2452 
2453  if (ctx->xvid_build <= 1U)
2455 
2456  if (ctx->xvid_build <= 12U)
2458 
2459  if (ctx->xvid_build <= 32U)
2461 
2462  if (ctx->lavc_build < 4653U)
2464 
2465  if (ctx->lavc_build < 4655U)
2467 
2468  if (ctx->lavc_build < 4670U)
2470 
2471  if (ctx->lavc_build <= 4712U)
2473 
2474  if (ctx->divx_version >= 0)
2476 
2477  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2478  s->padding_bug_score = 256 * 256 * 256 * 64;
2479 
2480  if (ctx->divx_version < 500U)
2482 
2483  if (ctx->divx_version >= 0)
2485  }
2486 
2487 
2488  if (s->avctx->debug & FF_DEBUG_BUGS)
2490  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2491  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2492  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2493 
2494  return decode_vop_header(ctx, gb);
2495 }
2496 
2497 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2498 {
2499  Mpeg4DecContext *ctx = avctx->priv_data;
2500  MpegEncContext *s = &ctx->m;
2501 
2502  /* divx 5.01+ bistream reorder stuff */
2503  if (s->divx_packed) {
2504  int current_pos = get_bits_count(&s->gb) >> 3;
2505  int startcode_found = 0;
2506 
2507  if (buf_size - current_pos > 5) {
2508  int i;
2509  for (i = current_pos; i < buf_size - 3; i++)
2510  if (buf[i] == 0 &&
2511  buf[i + 1] == 0 &&
2512  buf[i + 2] == 1 &&
2513  buf[i + 3] == 0xB6) {
2514  startcode_found = 1;
2515  break;
2516  }
2517  }
2518  if (s->gb.buffer == s->bitstream_buffer && buf_size > 7 &&
2519  ctx->xvid_build >= 0) { // xvid style
2520  startcode_found = 1;
2521  current_pos = 0;
2522  }
2523 
2524  if (startcode_found) {
2527  buf_size - current_pos +
2529  if (!s->bitstream_buffer)
2530  return AVERROR(ENOMEM);
2531  memcpy(s->bitstream_buffer, buf + current_pos,
2532  buf_size - current_pos);
2533  s->bitstream_buffer_size = buf_size - current_pos;
2534  }
2535  }
2536 
2537  return 0;
2538 }
2539 
2541  const AVCodecContext *src)
2542 {
2543  Mpeg4DecContext *s = dst->priv_data;
2544  const Mpeg4DecContext *s1 = src->priv_data;
2545 
2546  int ret = ff_mpeg_update_thread_context(dst, src);
2547 
2548  if (ret < 0)
2549  return ret;
2550 
2551  s->shape = s1->shape;
2553 
2554  return 0;
2555 }
2556 
2558 {
2559  Mpeg4DecContext *ctx = avctx->priv_data;
2560  MpegEncContext *s = &ctx->m;
2561  int ret;
2562  static int done = 0;
2563 
2564  ctx->divx_version =
2565  ctx->divx_build =
2566  ctx->xvid_build =
2567  ctx->lavc_build = -1;
2568 
2569  if ((ret = ff_h263_decode_init(avctx)) < 0)
2570  return ret;
2571 
2572  if (!done) {
2573  done = 1;
2574 
2581  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2582  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2583  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2584  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2585  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2586  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2587  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2588  &ff_sprite_trajectory_tab[0][1], 4, 2,
2589  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2590  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2591  &ff_mb_type_b_tab[0][1], 2, 1,
2592  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2593  }
2594 
2595  s->h263_pred = 1;
2596  s->low_delay = 0; /* default, might be overriden in the vol header during header parsing */
2598  ctx->time_increment_bits = 4; /* default value for broken headers */
2599 
2601  avctx->internal->allocate_progress = 1;
2602 
2603  return 0;
2604 }
2605 
2607  { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2608  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2609  { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2610  { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2611  { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2612  { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2613  { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2614  { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2615  { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2616  { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2617  { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2618  { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2619  { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2620  { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2621  { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2622  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2623 };
2624 
2626  .name = "mpeg4",
2627  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2628  .type = AVMEDIA_TYPE_VIDEO,
2629  .id = AV_CODEC_ID_MPEG4,
2630  .priv_data_size = sizeof(Mpeg4DecContext),
2631  .init = decode_init,
2634  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2637  .flush = ff_mpeg_flush,
2638  .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2639  .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2640  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2641 };
int last_time_base
Definition: mpegvideo.h:573
int bitstream_buffer_size
Definition: mpegvideo.h:602
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:348
uint16_t sprite_traj[4][2]
sprite shift [isChroma]
Definition: mpeg4video.h:72
#define FF_PROFILE_MPEG4_SIMPLE
Definition: avcodec.h:2646
#define MB_TYPE_SKIP
Definition: avcodec.h:813
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2372
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
int aspect_ratio_info
Definition: mpegvideo.h:587
int picture_number
Definition: mpegvideo.h:298
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2298
ScanTable intra_v_scantable
Definition: mpegvideo.h:321
S(GMC)-VOP MPEG4.
Definition: avutil.h:256
RLTable ff_mpeg4_rl_intra
Definition: mpeg4data.h:109
const uint8_t ff_mpeg4_c_dc_scale_table[32]
Definition: mpeg4data.h:363
#define IS_SKIP(a)
Definition: mpegvideo.h:163
#define CBPY_VLC_BITS
Definition: h263.h:39
int sprite_brightness_change
Definition: mpeg4video.h:69
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:444
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:374
int vol_control_parameters
does the stream contain the low_delay flag, used to workaround buggy encoders
Definition: mpegvideo.h:593
static const AVProfile profiles[]
Definition: dcadec.c:2072
int sprite_warping_accuracy
Definition: mpegvideo.h:588
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG1 & B-frame MPEG4
Definition: mpegvideo.h:453
mpeg2/4, h264 default
Definition: avcodec.h:607
av_cold int ff_dct_common_init(MpegEncContext *s)
Definition: mpegvideo.c:358
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:683
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:129
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:199
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:36
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:91
int resync_marker
time distance of first I -> B, used for interlaced b frames
Definition: mpeg4video.h:79
static int mpeg4_is_resync(MpegEncContext *s)
check if the next stuff is a resync marker or the end.
#define CODEC_CAP_TRUNCATED
Definition: avcodec.h:712
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:493
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
RLTable ff_h263_rl_inter
Definition: h263data.h:162
int16_t(*[3] ac_val)[16]
used for for mpeg4 AC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:380
int v_edge_pos
horizontal / vertical position of the right/bottom edge (pixel replication)
Definition: mpegvideo.h:304
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:93
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:170
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:495
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
int num
numerator
Definition: rational.h:44
int lavc_build
flag for having shown the warning about divxs invalid b frames
Definition: mpeg4video.h:94
uint8_t * bitstream_buffer
Definition: mpegvideo.h:601
enum AVCodecID codec_id
Definition: mpegvideo.h:280
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2310
const uint8_t * buffer
Definition: get_bits.h:54
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:54
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1422
static av_cold int decode_init(AVCodecContext *avctx)
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO
Definition: avcodec.h:2660
int real_sprite_warping_points
Definition: mpegvideo.h:581
#define AV_EF_BITSTREAM
Definition: avcodec.h:2399
mpegvideo header.
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1230
#define DC_VLC_BITS
Definition: mpeg4videodec.c:35
#define DC_MARKER
Definition: mpeg4video.h:54
#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE
Definition: avcodec.h:2647
uint8_t permutated[64]
Definition: dsputil.h:113
uint8_t run
Definition: svq3.c:142
#define ER_MV_ERROR
int padding_bug_score
used to detect the VERY common padding bug in MPEG4
Definition: mpegvideo.h:597
void ff_thread_await_progress(ThreadFrame *f, int n, int field)
Wait for earlier decoding threads to finish reference pictures.
#define SLICE_OK
Definition: mpegvideo.h:680
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:305
int profile
profile
Definition: avcodec.h:2596
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2755
int time_base
time in seconds of last I,P,S Frame
Definition: mpegvideo.h:574
RLTable.
Definition: rl.h:38
int qscale
QP.
Definition: mpegvideo.h:392
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:312
int field_select[2][2]
Definition: mpegvideo.h:452
#define FF_PROFILE_MPEG4_CORE_SCALABLE
Definition: avcodec.h:2656
int block_wrap[6]
Definition: mpegvideo.h:486
int quant_precision
Definition: mpegvideo.h:585
int cplx_estimation_trash_b
Definition: mpeg4video.h:100
#define USES_LIST(a, list)
does this mb use listX, note does not work if subMBs
Definition: mpegvideo.h:179
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:2029
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1173
int vol_sprite_usage
Definition: mpeg4video.h:68
Definition: vf_drawbox.c:37
#define USER_DATA_STARTCODE
Definition: mpeg4video.h:57
int mb_num_left
number of MBs left in this video packet (for partitioned Slices only)
Definition: mpegvideo.h:547
int64_t time
time of current frame
Definition: mpegvideo.h:575
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:46
int context_reinit
Definition: mpegvideo.h:717
const uint8_t ff_alternate_vertical_scan[64]
Definition: dsputil.c:82
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:269
#define MB_TYPE_INTRA
Definition: mpegvideo.h:157
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4) ...
Definition: mpegvideo.h:439
#define FF_IDCT_XVIDMMX
Definition: avcodec.h:2466
uint8_t bits
Definition: crc.c:216
uint8_t
#define av_cold
Definition: attributes.h:66
#define FF_PROFILE_MPEG4_CORE
Definition: avcodec.h:2648
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
float delta
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:443
#define FF_PROFILE_MPEG4_MAIN
Definition: avcodec.h:2649
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2349
const uint16_t ff_sprite_trajectory_tab[15][2]
Definition: mpeg4data.h:326
#define VOP_STARTCODE
Definition: mpeg4video.h:60
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
#define IS_3IV1
Definition: mpeg4video.h:162
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:386
Multithreading support functions.
#define FF_BUG_EDGE
Definition: avcodec.h:2309
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:459
int enhancement_type
Definition: mpeg4video.h:84
int interlaced_dct
Definition: mpegvideo.h:666
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:366
#define CHROMA_420
Definition: mpegvideo.h:658
#define FF_PROFILE_MPEG4_N_BIT
Definition: avcodec.h:2650
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:711
int cplx_estimation_trash_p
Definition: mpeg4video.h:99
#define RECT_SHAPE
Definition: mpeg4video.h:33
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:2307
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2306
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:45
#define ER_MV_END
uint16_t pp_time
time distance between the last 2 p,s,i frames
Definition: mpegvideo.h:577
uint8_t idct_permutation[64]
idct input permutation.
Definition: dsputil.h:240
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:300
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:290
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.h:275
int intra_dc_threshold
Definition: mpeg4video.h:88
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1761
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:172
#define MOTION_MARKER
Definition: mpeg4video.h:53
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:832
#define FF_IDCT_AUTO
Definition: avcodec.h:2457
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2463
MpegEncContext m
number of bits to represent the fractional part of time
Definition: mpeg4video.h:63
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:582
#define ROUNDED_DIV(a, b)
Definition: common.h:51
#define r
Definition: input.c:51
ThreadFrame tf
Definition: mpegvideo.h:101
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2308
int16_t * dc_val[3]
used for mpeg4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:373
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:161
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1332
uint8_t * mbskip_table
Definition: mpegvideo.h:137
int stream_codec_tag
internal stream_codec_tag upper case converted from avctx stream_codec_tag
Definition: mpegvideo.h:291
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:381
#define CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:740
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:590
#define STATIC_SPRITE
Definition: mpeg4video.h:50
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
#define AVERROR(e)
Definition: error.h:43
const uint8_t ff_alternate_horizontal_scan[64]
Definition: dsputil.c:71
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
ERContext er
Definition: mpegvideo.h:719
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
#define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION
Definition: avcodec.h:2652
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:144
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:38
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2300
#define FF_DEBUG_BUGS
Definition: avcodec.h:2366
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:80
const char * name
Name of the codec implementation.
Definition: avcodec.h:2762
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:586
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:591
GetBitContext gb
Definition: mpegvideo.h:632
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:679
#define CLOSE_READER(name, gb)
Definition: get_bits.h:141
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:59
#define CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:683
static int check_marker(GetBitContext *s, const char *msg)
Definition: get_bits.h:358
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
Definition: get_bits.h:488
Definition: get_bits.h:64
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2433
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:176
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:182
#define FF_PROFILE_MPEG4_SCALABLE_TEXTURE
Definition: avcodec.h:2651
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:544
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:41
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:509
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:583
const uint8_t ff_mpeg4_DCtab_lum[13][2]
Definition: mpeg4data.h:35
uint8_t ff_mpeg4_static_rl_table_store[3][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg4video.c:27
#define MB_TYPE_GMC
Definition: avcodec.h:812
#define IS_8X8(a)
Definition: mpegvideo.h:171
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:92
int err_recognition
Definition: mpegvideo.h:549
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:361
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
int progressive_frame
Definition: mpegvideo.h:664
int top_field_first
Definition: mpegvideo.h:650
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:42
#define CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:705
#define MB_TYPE_DIRECT2
Definition: avcodec.h:810
#define FFMIN(a, b)
Definition: common.h:57
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
static VLC dc_lum
Definition: mpeg4videodec.c:38
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
void(* clear_blocks)(int16_t *blocks)
Definition: dsputil.h:143
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2456
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
#define MB_TYPE_INTERLACED
Definition: avcodec.h:809
int16_t(*[2] motion_val)[2]
Definition: mpegvideo.h:107
#define GRAY_SHAPE
Definition: mpeg4video.h:36
#define ER_DC_END
#define FF_PROFILE_MPEG4_ADVANCED_CORE
Definition: avcodec.h:2658
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:636
int alternate_scan
Definition: mpegvideo.h:654
AVCodec ff_mpeg4_decoder
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:603
int size_in_bits
Definition: get_bits.h:56
int use_intra_dc_vlc
QP above whch the ac VLC should be used for intra dc.
Definition: mpeg4video.h:86
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:254
#define MB_TYPE_L0L1
Definition: avcodec.h:820
int level
level
Definition: avcodec.h:2679
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:182
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:522
#define AV_RL32
Definition: intreadwrite.h:146
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:314
#define MB_TYPE_ACPRED
Definition: avcodec.h:811
#define MB_TYPE_L1
Definition: avcodec.h:819
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:348
uint8_t * mbintra_table
used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
Definition: mpegvideo.h:384
#define FF_PROFILE_MPEG4_HYBRID
Definition: avcodec.h:2654
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2305
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:869
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:188
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:34
#define FF_BUG_UMP4
Definition: avcodec.h:2299
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:485
if(ac->has_optimized_func)
int * mb_index2xy
mb_index -> mb_x + mb_y*mb_stride
Definition: mpegvideo.h:489
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:441
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:620
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
decode partition C of one MB.
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:438
static int width
Definition: utils.c:156
#define AV_LOG_INFO
Standard information.
Definition: log.h:134
uint16_t inter_matrix[64]
Definition: mpegvideo.h:494
int64_t last_non_b_time
Definition: mpegvideo.h:576
int debug
debug
Definition: avcodec.h:2348
main external API structure.
Definition: avcodec.h:1054
int cplx_estimation_trash_i
Definition: mpeg4video.h:98
#define AV_CPU_FLAG_MMX
standard MMX
Definition: cpu.h:29
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define FF_PROFILE_MPEG4_ADVANCED_SIMPLE
Definition: avcodec.h:2661
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:489
#define FASTDIV(a, b)
Definition: mathops.h:195
#define RSHIFT(a, b)
Definition: common.h:49
ScanTable intra_scantable
Definition: mpegvideo.h:319
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:268
static int get_xbits(GetBitContext *s, int n)
read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
Definition: get_bits.h:213
#define OPEN_READER(name, gb)
Definition: get_bits.h:127
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: dsputil.c:107
#define SLICE_END
end marker found
Definition: mpegvideo.h:682
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:589
int showed_packed_warning
Definition: mpeg4video.h:96
int progressive_sequence
Definition: mpegvideo.h:640
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:271
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:296
static int mpeg4_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
ScanTable intra_h_scantable
Definition: mpegvideo.h:320
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:263
static const AVProfile mpeg4_video_profiles[]
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:385
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode mpeg4 headers.
#define GET_CACHE(name, gb)
Definition: get_bits.h:192
#define MB_TYPE_16x16
Definition: avcodec.h:805
DSPContext dsp
pointers for accelerated dsp functions
Definition: mpegvideo.h:411
#define FF_PROFILE_MPEG4_ADVANCED_CODING
Definition: avcodec.h:2657
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:165
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:47
const int16_t ff_mpeg4_default_intra_matrix[64]
Definition: mpeg4data.h:337
#define ER_DC_ERROR
int allocate_progress
Whether to allocate progress for frame threading.
Definition: internal.h:79
int f_code
forward MV resolution
Definition: mpegvideo.h:415
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:304
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:126
#define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME
Definition: avcodec.h:2655
int sprite_shift[2]
Definition: mpeg4video.h:74
#define MV_DIR_FORWARD
Definition: mpegvideo.h:437
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:399
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2294
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:273
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:29
uint16_t pb_field_time
like above, just for interlaced
Definition: mpegvideo.h:580
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:375
uint8_t level
Definition: svq3.c:143
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:451
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:302
#define IS_ACPRED(a)
Definition: mpegvideo.h:176
int height
Definition: gxfenc.c:72
MpegEncContext.
Definition: mpegvideo.h:264
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:369
int8_t * qscale_table
Definition: mpegvideo.h:104
struct AVCodecContext * avctx
Definition: mpegvideo.h:266
uint16_t pp_field_time
Definition: mpegvideo.h:579
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:189
static VLC sprite_trajectory
Definition: mpeg4videodec.c:39
#define FF_BUG_AMV
Definition: avcodec.h:2301
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: mem.c:368
common internal api header.
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:113
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:301
#define CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:782
#define TEX_VLC_BITS
Definition: dv.h:90
static av_cold void flush(AVCodecContext *avctx)
Flush (reset) the frame ID after seeking.
Definition: alsdec.c:1792
static VLC dc_chrom
Definition: mpeg4videodec.c:38
#define MB_TYPE_8x8
Definition: avcodec.h:808
Bi-dir predicted.
Definition: avutil.h:255
AVProfile.
Definition: avcodec.h:2743
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:40
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
int den
denominator
Definition: rational.h:45
#define MB_TYPE_16x8
Definition: avcodec.h:806
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:498
#define IS_INTRA(x, y)
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:125
void * priv_data
Definition: avcodec.h:1090
float re
Definition: fft-test.c:65
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2362
#define IS_DIRECT(a)
Definition: mpegvideo.h:166
int len
int rvlc
could this stream contain resync markers
Definition: mpeg4video.h:77
#define av_log2
Definition: intmath.h:85
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1098
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:545
av_cold void ff_init_rl(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: mpegvideo.c:1479
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:677
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:354
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:416
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
int chroma_qscale
chroma QP
Definition: mpegvideo.h:393
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:269
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
int flags
AVCodecContext.flags (HQ, MV4, ...)
Definition: mpegvideo.h:283
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:492
uint32_t * mb_type
Definition: mpegvideo.h:110
int time_increment_bits
Definition: mpeg4video.h:66
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:289
ScanTable inter_scantable
if inter == intra then intra should be used to reduce tha cache usage
Definition: mpegvideo.h:318
#define FRAME_SKIPPED
return value for header parsers if frame is not coded
Definition: mpegvideo.h:47
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=av_sample_fmt_is_planar(in_fmt);out_planar=av_sample_fmt_is_planar(out_fmt);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_dlog(ac->avr,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
int num_sprite_warping_points
sprite trajectory points
Definition: mpeg4video.h:70
#define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE
Definition: avcodec.h:2653
#define MV_TYPE_8X8
4 vectors (h263, mpeg4 4MV)
Definition: mpegvideo.h:442
int b_code
backward MV resolution for B Frames (mpeg4)
Definition: mpegvideo.h:416
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2311
const uint8_t ff_mb_type_b_tab[4][2]
Definition: mpeg4data.h:332
static int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block, int n, int coded, int intra, int rvlc)
Decode a block.
#define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE
Definition: avcodec.h:2659
for(j=16;j >0;--j)
#define MB_TYPE_L0
Definition: avcodec.h:818
Predicted.
Definition: avutil.h:254
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:37
#define GOP_STARTCODE
Definition: mpeg4video.h:58
#define VOS_STARTCODE
Definition: mpeg4video.h:56
uint16_t pb_time
time distance between the last b and p,s,i frame
Definition: mpegvideo.h:578
#define GMC_SPRITE
Definition: mpeg4video.h:51
static int16_t block[64]
Definition: dct-test.c:170