Libav
mpeg4videodec.c
Go to the documentation of this file.
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 "idctdsp.h"
25 #include "internal.h"
26 #include "mpegutils.h"
27 #include "mpegvideo.h"
28 #include "mpeg4video.h"
29 #include "h263.h"
30 #include "thread.h"
31 #include "xvididct.h"
32 
33 /* The defines below define the number of bits that are read at once for
34  * reading vlc values. Changing these may improve speed and data cache needs
35  * be aware though that decreasing them may need the number of stages that is
36  * passed to get_vlc* to be increased. */
37 #define SPRITE_TRAJ_VLC_BITS 6
38 #define DC_VLC_BITS 9
39 #define MB_TYPE_B_VLC_BITS 4
40 
44 
45 static const int mb_type_b_map[4] = {
50 };
51 
57 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
58 {
59  int i;
60  int16_t *ac_val, *ac_val1;
61  int8_t *const qscale_table = s->current_picture.qscale_table;
62 
63  /* find prediction */
64  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
65  ac_val1 = ac_val;
66  if (s->ac_pred) {
67  if (dir == 0) {
68  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
69  /* left prediction */
70  ac_val -= 16;
71 
72  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
73  n == 1 || n == 3) {
74  /* same qscale */
75  for (i = 1; i < 8; i++)
76  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
77  } else {
78  /* different qscale, we must rescale */
79  for (i = 1; i < 8; i++)
80  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
81  }
82  } else {
83  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
84  /* top prediction */
85  ac_val -= 16 * s->block_wrap[n];
86 
87  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
88  n == 2 || n == 3) {
89  /* same qscale */
90  for (i = 1; i < 8; i++)
91  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
92  } else {
93  /* different qscale, we must rescale */
94  for (i = 1; i < 8; i++)
95  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
96  }
97  }
98  }
99  /* left copy */
100  for (i = 1; i < 8; i++)
101  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
102 
103  /* top copy */
104  for (i = 1; i < 8; i++)
105  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
106 }
107 
112 static inline int mpeg4_is_resync(MpegEncContext *s)
113 {
114  int bits_count = get_bits_count(&s->gb);
115  int v = show_bits(&s->gb, 16);
116 
118  return 0;
119 
120  while (v <= 0xFF) {
121  if (s->pict_type == AV_PICTURE_TYPE_B ||
122  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
123  break;
124  skip_bits(&s->gb, 8 + s->pict_type);
125  bits_count += 8 + s->pict_type;
126  v = show_bits(&s->gb, 16);
127  }
128 
129  if (bits_count + 8 >= s->gb.size_in_bits) {
130  v >>= 8;
131  v |= 0x7F >> (7 - (bits_count & 7));
132 
133  if (v == 0x7F)
134  return 1;
135  } else {
136  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
137  int len;
138  GetBitContext gb = s->gb;
139 
140  skip_bits(&s->gb, 1);
141  align_get_bits(&s->gb);
142 
143  for (len = 0; len < 32; len++)
144  if (get_bits1(&s->gb))
145  break;
146 
147  s->gb = gb;
148 
150  return 1;
151  }
152  }
153  return 0;
154 }
155 
157 {
158  MpegEncContext *s = &ctx->m;
159  int a = 2 << s->sprite_warping_accuracy;
160  int rho = 3 - s->sprite_warping_accuracy;
161  int r = 16 / a;
162  int alpha = 0;
163  int beta = 0;
164  int w = s->width;
165  int h = s->height;
166  int min_ab, i, w2, h2, w3, h3;
167  int sprite_ref[4][2];
168  int virtual_ref[2][2];
169 
170  // only true for rectangle shapes
171  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
172  { 0, s->height }, { s->width, s->height } };
173  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
174 
175  if (w <= 0 || h <= 0)
176  return AVERROR_INVALIDDATA;
177 
178  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
179  int length;
180  int x = 0, y = 0;
181 
182  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
183  if (length)
184  x = get_xbits(gb, length);
185 
186  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
187  skip_bits1(gb); /* marker bit */
188 
189  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
190  if (length)
191  y = get_xbits(gb, length);
192 
193  skip_bits1(gb); /* marker bit */
194  ctx->sprite_traj[i][0] = d[i][0] = x;
195  ctx->sprite_traj[i][1] = d[i][1] = y;
196  }
197  for (; i < 4; i++)
198  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
199 
200  while ((1 << alpha) < w)
201  alpha++;
202  while ((1 << beta) < h)
203  beta++; /* typo in the mpeg4 std for the definition of w' and h' */
204  w2 = 1 << alpha;
205  h2 = 1 << beta;
206 
207  // Note, the 4th point isn't used for GMC
208  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
209  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
210  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
211  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
212  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
213  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
214  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
215  } else {
216  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
217  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
218  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
219  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
220  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
221  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
222  }
223  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
224  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
225 
226  /* this is mostly identical to the mpeg4 std (and is totally unreadable
227  * because of that...). Perhaps it should be reordered to be more readable.
228  * The idea behind this virtual_ref mess is to be able to use shifts later
229  * per pixel instead of divides so the distance between points is converted
230  * from w&h based to w2&h2 based which are of the 2^x form. */
231  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
232  ROUNDED_DIV(((w - w2) *
233  (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
234  w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
235  virtual_ref[0][1] = 16 * vop_ref[0][1] +
236  ROUNDED_DIV(((w - w2) *
237  (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
238  w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
239  virtual_ref[1][0] = 16 * vop_ref[0][0] +
240  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
241  h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
242  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
243  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
244  h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
245 
246  switch (ctx->num_sprite_warping_points) {
247  case 0:
248  s->sprite_offset[0][0] =
249  s->sprite_offset[0][1] =
250  s->sprite_offset[1][0] =
251  s->sprite_offset[1][1] = 0;
252  s->sprite_delta[0][0] = a;
253  s->sprite_delta[0][1] =
254  s->sprite_delta[1][0] = 0;
255  s->sprite_delta[1][1] = a;
256  ctx->sprite_shift[0] =
257  ctx->sprite_shift[1] = 0;
258  break;
259  case 1: // GMC only
260  s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
261  s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
262  s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
263  a * (vop_ref[0][0] / 2);
264  s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
265  a * (vop_ref[0][1] / 2);
266  s->sprite_delta[0][0] = a;
267  s->sprite_delta[0][1] =
268  s->sprite_delta[1][0] = 0;
269  s->sprite_delta[1][1] = a;
270  ctx->sprite_shift[0] =
271  ctx->sprite_shift[1] = 0;
272  break;
273  case 2:
274  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
275  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
276  (-vop_ref[0][0]) +
277  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
278  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
279  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
280  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
281  (-vop_ref[0][0]) +
282  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
283  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
284  s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
285  (-2 * vop_ref[0][0] + 1) +
286  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
287  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
288  sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
289  s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
290  (-2 * vop_ref[0][0] + 1) +
291  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
292  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
293  sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
294  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
295  s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
296  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
297  s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
298 
299  ctx->sprite_shift[0] = alpha + rho;
300  ctx->sprite_shift[1] = alpha + rho + 2;
301  break;
302  case 3:
303  min_ab = FFMIN(alpha, beta);
304  w3 = w2 >> min_ab;
305  h3 = h2 >> min_ab;
306  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
307  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
308  h3 * (-vop_ref[0][0]) +
309  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
310  w3 * (-vop_ref[0][1]) +
311  (1 << (alpha + beta + rho - min_ab - 1));
312  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
313  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
314  h3 * (-vop_ref[0][0]) +
315  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
316  w3 * (-vop_ref[0][1]) +
317  (1 << (alpha + beta + rho - min_ab - 1));
318  s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
319  h3 * (-2 * vop_ref[0][0] + 1) +
320  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
321  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
322  r * sprite_ref[0][0] - 16 * w2 * h3 +
323  (1 << (alpha + beta + rho - min_ab + 1));
324  s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
325  h3 * (-2 * vop_ref[0][0] + 1) +
326  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
327  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
328  r * sprite_ref[0][1] - 16 * w2 * h3 +
329  (1 << (alpha + beta + rho - min_ab + 1));
330  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
331  s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
332  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
333  s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
334 
335  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
336  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
337  break;
338  }
339  /* try to simplify the situation */
340  if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
341  s->sprite_delta[0][1] == 0 &&
342  s->sprite_delta[1][0] == 0 &&
343  s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
344  s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
345  s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
346  s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
347  s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
348  s->sprite_delta[0][0] = a;
349  s->sprite_delta[0][1] = 0;
350  s->sprite_delta[1][0] = 0;
351  s->sprite_delta[1][1] = a;
352  ctx->sprite_shift[0] = 0;
353  ctx->sprite_shift[1] = 0;
355  } else {
356  int shift_y = 16 - ctx->sprite_shift[0];
357  int shift_c = 16 - ctx->sprite_shift[1];
358  for (i = 0; i < 2; i++) {
359  s->sprite_offset[0][i] <<= shift_y;
360  s->sprite_offset[1][i] <<= shift_c;
361  s->sprite_delta[0][i] <<= shift_y;
362  s->sprite_delta[1][i] <<= shift_y;
363  ctx->sprite_shift[i] = 16;
364  }
366  }
367 
368  return 0;
369 }
370 
376 {
377  MpegEncContext *s = &ctx->m;
378 
379  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
380  int header_extension = 0, mb_num, len;
381 
382  /* is there enough space left for a video packet + header */
383  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
384  return -1;
385 
386  for (len = 0; len < 32; len++)
387  if (get_bits1(&s->gb))
388  break;
389 
391  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
392  return -1;
393  }
394 
395  if (ctx->shape != RECT_SHAPE) {
396  header_extension = get_bits1(&s->gb);
397  // FIXME more stuff here
398  }
399 
400  mb_num = get_bits(&s->gb, mb_num_bits);
401  if (mb_num >= s->mb_num) {
403  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
404  return -1;
405  }
406  if (s->pict_type == AV_PICTURE_TYPE_B) {
407  int mb_x = 0, mb_y = 0;
408 
409  while (s->next_picture.mbskip_table[s->mb_index2xy[mb_num]]) {
410  if (!mb_x)
412  mb_num++;
413  if (++mb_x == s->mb_width)
414  mb_x = 0;
415  }
416  if (mb_num >= s->mb_num)
417  return -1; // slice contains just skipped MBs (already decoded)
418  }
419 
420  s->mb_x = mb_num % s->mb_width;
421  s->mb_y = mb_num / s->mb_width;
422 
423  if (ctx->shape != BIN_ONLY_SHAPE) {
424  int qscale = get_bits(&s->gb, s->quant_precision);
425  if (qscale)
426  s->chroma_qscale = s->qscale = qscale;
427  }
428 
429  if (ctx->shape == RECT_SHAPE)
430  header_extension = get_bits1(&s->gb);
431 
432  if (header_extension) {
433  int time_incr = 0;
434 
435  while (get_bits1(&s->gb) != 0)
436  time_incr++;
437 
438  check_marker(&s->gb, "before time_increment in video packed header");
439  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
440  check_marker(&s->gb, "before vop_coding_type in video packed header");
441 
442  skip_bits(&s->gb, 2); /* vop coding type */
443  // FIXME not rect stuff here
444 
445  if (ctx->shape != BIN_ONLY_SHAPE) {
446  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
447  // FIXME don't just ignore everything
448  if (s->pict_type == AV_PICTURE_TYPE_S &&
449  ctx->vol_sprite_usage == GMC_SPRITE) {
450  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
451  return AVERROR_INVALIDDATA;
452  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
453  }
454 
455  // FIXME reduced res stuff here
456 
457  if (s->pict_type != AV_PICTURE_TYPE_I) {
458  int f_code = get_bits(&s->gb, 3); /* fcode_for */
459  if (f_code == 0)
461  "Error, video packet header damaged (f_code=0)\n");
462  }
463  if (s->pict_type == AV_PICTURE_TYPE_B) {
464  int b_code = get_bits(&s->gb, 3);
465  if (b_code == 0)
467  "Error, video packet header damaged (b_code=0)\n");
468  }
469  }
470  }
471  // FIXME new-pred stuff
472 
473  return 0;
474 }
475 
481 static inline int get_amv(Mpeg4DecContext *ctx, int n)
482 {
483  MpegEncContext *s = &ctx->m;
484  int x, y, mb_v, sum, dx, dy, shift;
485  int len = 1 << (s->f_code + 4);
486  const int a = s->sprite_warping_accuracy;
487 
488  if (s->workaround_bugs & FF_BUG_AMV)
489  len >>= s->quarter_sample;
490 
491  if (s->real_sprite_warping_points == 1) {
492  if (ctx->divx_version == 500 && ctx->divx_build == 413)
493  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
494  else
495  sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
496  } else {
497  dx = s->sprite_delta[n][0];
498  dy = s->sprite_delta[n][1];
499  shift = ctx->sprite_shift[0];
500  if (n)
501  dy -= 1 << (shift + a + 1);
502  else
503  dx -= 1 << (shift + a + 1);
504  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
505 
506  sum = 0;
507  for (y = 0; y < 16; y++) {
508  int v;
509 
510  v = mb_v + dy * y;
511  // FIXME optimize
512  for (x = 0; x < 16; x++) {
513  sum += v >> shift;
514  v += dx;
515  }
516  }
517  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
518  }
519 
520  if (sum < -len)
521  sum = -len;
522  else if (sum >= len)
523  sum = len - 1;
524 
525  return sum;
526 }
527 
534 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
535 {
536  int level, code;
537 
538  if (n < 4)
539  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
540  else
541  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
542 
543  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
544  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
545  return -1;
546  }
547 
548  if (code == 0) {
549  level = 0;
550  } else {
551  if (IS_3IV1) {
552  if (code == 1)
553  level = 2 * get_bits1(&s->gb) - 1;
554  else {
555  if (get_bits1(&s->gb))
556  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
557  else
558  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
559  }
560  } else {
561  level = get_xbits(&s->gb, code);
562  }
563 
564  if (code > 8) {
565  if (get_bits1(&s->gb) == 0) { /* marker */
566  if (s->err_recognition & AV_EF_BITSTREAM) {
567  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
568  return -1;
569  }
570  }
571  }
572  }
573 
574  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
575 }
576 
582 {
583  MpegEncContext *s = &ctx->m;
584  int mb_num = 0;
585  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
586 
587  /* decode first partition */
588  s->first_slice_line = 1;
589  for (; s->mb_y < s->mb_height; s->mb_y++) {
591  for (; s->mb_x < s->mb_width; s->mb_x++) {
592  const int xy = s->mb_x + s->mb_y * s->mb_stride;
593  int cbpc;
594  int dir = 0;
595 
596  mb_num++;
598  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
599  s->first_slice_line = 0;
600 
601  if (s->pict_type == AV_PICTURE_TYPE_I) {
602  int i;
603 
604  do {
605  if (show_bits_long(&s->gb, 19) == DC_MARKER)
606  return mb_num - 1;
607 
609  if (cbpc < 0) {
611  "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
612  return -1;
613  }
614  } while (cbpc == 8);
615 
616  s->cbp_table[xy] = cbpc & 3;
618  s->mb_intra = 1;
619 
620  if (cbpc & 4)
621  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
622 
623  s->current_picture.qscale_table[xy] = s->qscale;
624 
625  s->mbintra_table[xy] = 1;
626  for (i = 0; i < 6; i++) {
627  int dc_pred_dir;
628  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
629  if (dc < 0) {
631  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
632  return -1;
633  }
634  dir <<= 1;
635  if (dc_pred_dir)
636  dir |= 1;
637  }
638  s->pred_dir_table[xy] = dir;
639  } else { /* P/S_TYPE */
640  int mx, my, pred_x, pred_y, bits;
641  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
642  const int stride = s->b8_stride * 2;
643 
644 try_again:
645  bits = show_bits(&s->gb, 17);
646  if (bits == MOTION_MARKER)
647  return mb_num - 1;
648 
649  skip_bits1(&s->gb);
650  if (bits & 0x10000) {
651  /* skip mb */
652  if (s->pict_type == AV_PICTURE_TYPE_S &&
653  ctx->vol_sprite_usage == GMC_SPRITE) {
655  MB_TYPE_16x16 |
656  MB_TYPE_GMC |
657  MB_TYPE_L0;
658  mx = get_amv(ctx, 0);
659  my = get_amv(ctx, 1);
660  } else {
662  MB_TYPE_16x16 |
663  MB_TYPE_L0;
664  mx = my = 0;
665  }
666  mot_val[0] =
667  mot_val[2] =
668  mot_val[0 + stride] =
669  mot_val[2 + stride] = mx;
670  mot_val[1] =
671  mot_val[3] =
672  mot_val[1 + stride] =
673  mot_val[3 + stride] = my;
674 
675  if (s->mbintra_table[xy])
677  continue;
678  }
679 
681  if (cbpc < 0) {
683  "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
684  return -1;
685  }
686  if (cbpc == 20)
687  goto try_again;
688 
689  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
690 
691  s->mb_intra = ((cbpc & 4) != 0);
692 
693  if (s->mb_intra) {
695  s->mbintra_table[xy] = 1;
696  mot_val[0] =
697  mot_val[2] =
698  mot_val[0 + stride] =
699  mot_val[2 + stride] = 0;
700  mot_val[1] =
701  mot_val[3] =
702  mot_val[1 + stride] =
703  mot_val[3 + stride] = 0;
704  } else {
705  if (s->mbintra_table[xy])
707 
708  if (s->pict_type == AV_PICTURE_TYPE_S &&
709  ctx->vol_sprite_usage == GMC_SPRITE &&
710  (cbpc & 16) == 0)
711  s->mcsel = get_bits1(&s->gb);
712  else
713  s->mcsel = 0;
714 
715  if ((cbpc & 16) == 0) {
716  /* 16x16 motion prediction */
717 
718  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
719  if (!s->mcsel) {
720  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
721  if (mx >= 0xffff)
722  return -1;
723 
724  my = ff_h263_decode_motion(s, pred_y, s->f_code);
725  if (my >= 0xffff)
726  return -1;
728  MB_TYPE_L0;
729  } else {
730  mx = get_amv(ctx, 0);
731  my = get_amv(ctx, 1);
733  MB_TYPE_GMC |
734  MB_TYPE_L0;
735  }
736 
737  mot_val[0] =
738  mot_val[2] =
739  mot_val[0 + stride] =
740  mot_val[2 + stride] = mx;
741  mot_val[1] =
742  mot_val[3] =
743  mot_val[1 + stride] =
744  mot_val[3 + stride] = my;
745  } else {
746  int i;
748  MB_TYPE_L0;
749  for (i = 0; i < 4; i++) {
750  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
751  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
752  if (mx >= 0xffff)
753  return -1;
754 
755  my = ff_h263_decode_motion(s, pred_y, s->f_code);
756  if (my >= 0xffff)
757  return -1;
758  mot_val[0] = mx;
759  mot_val[1] = my;
760  }
761  }
762  }
763  }
764  }
765  s->mb_x = 0;
766  }
767 
768  return mb_num;
769 }
770 
775 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
776 {
777  int mb_num = 0;
778  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
779 
780  s->mb_x = s->resync_mb_x;
781  s->first_slice_line = 1;
782  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
784  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
785  const int xy = s->mb_x + s->mb_y * s->mb_stride;
786 
787  mb_num++;
789  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
790  s->first_slice_line = 0;
791 
792  if (s->pict_type == AV_PICTURE_TYPE_I) {
793  int ac_pred = get_bits1(&s->gb);
794  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
795  if (cbpy < 0) {
797  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
798  return -1;
799  }
800 
801  s->cbp_table[xy] |= cbpy << 2;
802  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
803  } else { /* P || S_TYPE */
804  if (IS_INTRA(s->current_picture.mb_type[xy])) {
805  int i;
806  int dir = 0;
807  int ac_pred = get_bits1(&s->gb);
808  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
809 
810  if (cbpy < 0) {
812  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
813  return -1;
814  }
815 
816  if (s->cbp_table[xy] & 8)
817  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
818  s->current_picture.qscale_table[xy] = s->qscale;
819 
820  for (i = 0; i < 6; i++) {
821  int dc_pred_dir;
822  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
823  if (dc < 0) {
825  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
826  return -1;
827  }
828  dir <<= 1;
829  if (dc_pred_dir)
830  dir |= 1;
831  }
832  s->cbp_table[xy] &= 3; // remove dquant
833  s->cbp_table[xy] |= cbpy << 2;
834  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
835  s->pred_dir_table[xy] = dir;
836  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
837  s->current_picture.qscale_table[xy] = s->qscale;
838  s->cbp_table[xy] = 0;
839  } else {
840  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
841 
842  if (cbpy < 0) {
844  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
845  return -1;
846  }
847 
848  if (s->cbp_table[xy] & 8)
849  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
850  s->current_picture.qscale_table[xy] = s->qscale;
851 
852  s->cbp_table[xy] &= 3; // remove dquant
853  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
854  }
855  }
856  }
857  if (mb_num >= mb_count)
858  return 0;
859  s->mb_x = 0;
860  }
861  return 0;
862 }
863 
869 {
870  MpegEncContext *s = &ctx->m;
871  int mb_num;
872  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
873  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
874 
875  mb_num = mpeg4_decode_partition_a(ctx);
876  if (mb_num < 0) {
878  s->mb_x, s->mb_y, part_a_error);
879  return -1;
880  }
881 
882  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
883  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
885  s->mb_x, s->mb_y, part_a_error);
886  return -1;
887  }
888 
889  s->mb_num_left = mb_num;
890 
891  if (s->pict_type == AV_PICTURE_TYPE_I) {
892  while (show_bits(&s->gb, 9) == 1)
893  skip_bits(&s->gb, 9);
894  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
896  "marker missing after first I partition at %d %d\n",
897  s->mb_x, s->mb_y);
898  return -1;
899  }
900  } else {
901  while (show_bits(&s->gb, 10) == 1)
902  skip_bits(&s->gb, 10);
903  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
905  "marker missing after first P partition at %d %d\n",
906  s->mb_x, s->mb_y);
907  return -1;
908  }
909  }
911  s->mb_x - 1, s->mb_y, part_a_end);
912 
913  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
914  if (s->pict_type == AV_PICTURE_TYPE_P)
916  s->mb_x, s->mb_y, ER_DC_ERROR);
917  return -1;
918  } else {
919  if (s->pict_type == AV_PICTURE_TYPE_P)
921  s->mb_x - 1, s->mb_y, ER_DC_END);
922  }
923 
924  return 0;
925 }
926 
931 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
932  int n, int coded, int intra, int rvlc)
933 {
934  MpegEncContext *s = &ctx->m;
935  int level, i, last, run, qmul, qadd, dc_pred_dir;
936  RLTable *rl;
937  RL_VLC_ELEM *rl_vlc;
938  const uint8_t *scan_table;
939 
940  // Note intra & rvlc should be optimized away if this is inlined
941 
942  if (intra) {
943  if (ctx->use_intra_dc_vlc) {
944  /* DC coef */
945  if (s->partitioned_frame) {
946  level = s->dc_val[0][s->block_index[n]];
947  if (n < 4)
948  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
949  else
950  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
951  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
952  } else {
953  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
954  if (level < 0)
955  return -1;
956  }
957  block[0] = level;
958  i = 0;
959  } else {
960  i = -1;
961  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
962  }
963  if (!coded)
964  goto not_coded;
965 
966  if (rvlc) {
967  rl = &ff_rvlc_rl_intra;
968  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
969  } else {
970  rl = &ff_mpeg4_rl_intra;
971  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
972  }
973  if (s->ac_pred) {
974  if (dc_pred_dir == 0)
975  scan_table = s->intra_v_scantable.permutated; /* left */
976  else
977  scan_table = s->intra_h_scantable.permutated; /* top */
978  } else {
979  scan_table = s->intra_scantable.permutated;
980  }
981  qmul = 1;
982  qadd = 0;
983  } else {
984  i = -1;
985  if (!coded) {
986  s->block_last_index[n] = i;
987  return 0;
988  }
989  if (rvlc)
990  rl = &ff_rvlc_rl_inter;
991  else
992  rl = &ff_h263_rl_inter;
993 
994  scan_table = s->intra_scantable.permutated;
995 
996  if (s->mpeg_quant) {
997  qmul = 1;
998  qadd = 0;
999  if (rvlc)
1000  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1001  else
1002  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1003  } else {
1004  qmul = s->qscale << 1;
1005  qadd = (s->qscale - 1) | 1;
1006  if (rvlc)
1007  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1008  else
1009  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1010  }
1011  }
1012  {
1013  OPEN_READER(re, &s->gb);
1014  for (;;) {
1015  UPDATE_CACHE(re, &s->gb);
1016  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1017  if (level == 0) {
1018  /* escape */
1019  if (rvlc) {
1020  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1022  "1. marker bit missing in rvlc esc\n");
1023  return -1;
1024  }
1025  SKIP_CACHE(re, &s->gb, 1);
1026 
1027  last = SHOW_UBITS(re, &s->gb, 1);
1028  SKIP_CACHE(re, &s->gb, 1);
1029  run = SHOW_UBITS(re, &s->gb, 6);
1030  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1031  UPDATE_CACHE(re, &s->gb);
1032 
1033  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1035  "2. marker bit missing in rvlc esc\n");
1036  return -1;
1037  }
1038  SKIP_CACHE(re, &s->gb, 1);
1039 
1040  level = SHOW_UBITS(re, &s->gb, 11);
1041  SKIP_CACHE(re, &s->gb, 11);
1042 
1043  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1044  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1045  return -1;
1046  }
1047  SKIP_CACHE(re, &s->gb, 5);
1048 
1049  level = level * qmul + qadd;
1050  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1051  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1052 
1053  i += run + 1;
1054  if (last)
1055  i += 192;
1056  } else {
1057  int cache;
1058  cache = GET_CACHE(re, &s->gb);
1059 
1060  if (IS_3IV1)
1061  cache ^= 0xC0000000;
1062 
1063  if (cache & 0x80000000) {
1064  if (cache & 0x40000000) {
1065  /* third escape */
1066  SKIP_CACHE(re, &s->gb, 2);
1067  last = SHOW_UBITS(re, &s->gb, 1);
1068  SKIP_CACHE(re, &s->gb, 1);
1069  run = SHOW_UBITS(re, &s->gb, 6);
1070  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1071  UPDATE_CACHE(re, &s->gb);
1072 
1073  if (IS_3IV1) {
1074  level = SHOW_SBITS(re, &s->gb, 12);
1075  LAST_SKIP_BITS(re, &s->gb, 12);
1076  } else {
1077  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1079  "1. marker bit missing in 3. esc\n");
1080  return -1;
1081  }
1082  SKIP_CACHE(re, &s->gb, 1);
1083 
1084  level = SHOW_SBITS(re, &s->gb, 12);
1085  SKIP_CACHE(re, &s->gb, 12);
1086 
1087  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1089  "2. marker bit missing in 3. esc\n");
1090  return -1;
1091  }
1092 
1093  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1094  }
1095 
1096  if (level > 0)
1097  level = level * qmul + qadd;
1098  else
1099  level = level * qmul - qadd;
1100 
1101  if ((unsigned)(level + 2048) > 4095) {
1102  if (s->err_recognition & AV_EF_BITSTREAM) {
1103  if (level > 2560 || level < -2560) {
1105  "|level| overflow in 3. esc, qp=%d\n",
1106  s->qscale);
1107  return -1;
1108  }
1109  }
1110  level = level < 0 ? -2048 : 2047;
1111  }
1112 
1113  i += run + 1;
1114  if (last)
1115  i += 192;
1116  } else {
1117  /* second escape */
1118  SKIP_BITS(re, &s->gb, 2);
1119  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1120  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1121  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1122  LAST_SKIP_BITS(re, &s->gb, 1);
1123  }
1124  } else {
1125  /* first escape */
1126  SKIP_BITS(re, &s->gb, 1);
1127  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1128  i += run;
1129  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1130  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1131  LAST_SKIP_BITS(re, &s->gb, 1);
1132  }
1133  }
1134  } else {
1135  i += run;
1136  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1137  LAST_SKIP_BITS(re, &s->gb, 1);
1138  }
1139  if (i > 62) {
1140  i -= 192;
1141  if (i & (~63)) {
1143  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1144  return -1;
1145  }
1146 
1147  block[scan_table[i]] = level;
1148  break;
1149  }
1150 
1151  block[scan_table[i]] = level;
1152  }
1153  CLOSE_READER(re, &s->gb);
1154  }
1155 
1156 not_coded:
1157  if (intra) {
1158  if (!ctx->use_intra_dc_vlc) {
1159  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1160 
1161  i -= i >> 31; // if (i == -1) i = 0;
1162  }
1163 
1164  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1165  if (s->ac_pred)
1166  i = 63; // FIXME not optimal
1167  }
1168  s->block_last_index[n] = i;
1169  return 0;
1170 }
1171 
1176 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1177 {
1178  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1179  int cbp, mb_type;
1180  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1181 
1182  mb_type = s->current_picture.mb_type[xy];
1183  cbp = s->cbp_table[xy];
1184 
1185  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1186 
1187  if (s->current_picture.qscale_table[xy] != s->qscale)
1189 
1190  if (s->pict_type == AV_PICTURE_TYPE_P ||
1191  s->pict_type == AV_PICTURE_TYPE_S) {
1192  int i;
1193  for (i = 0; i < 4; i++) {
1194  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1195  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1196  }
1197  s->mb_intra = IS_INTRA(mb_type);
1198 
1199  if (IS_SKIP(mb_type)) {
1200  /* skip mb */
1201  for (i = 0; i < 6; i++)
1202  s->block_last_index[i] = -1;
1203  s->mv_dir = MV_DIR_FORWARD;
1204  s->mv_type = MV_TYPE_16X16;
1206  && ctx->vol_sprite_usage == GMC_SPRITE) {
1207  s->mcsel = 1;
1208  s->mb_skipped = 0;
1209  } else {
1210  s->mcsel = 0;
1211  s->mb_skipped = 1;
1212  }
1213  } else if (s->mb_intra) {
1215  } else if (!s->mb_intra) {
1216  // s->mcsel = 0; // FIXME do we need to init that?
1217 
1218  s->mv_dir = MV_DIR_FORWARD;
1219  if (IS_8X8(mb_type)) {
1220  s->mv_type = MV_TYPE_8X8;
1221  } else {
1222  s->mv_type = MV_TYPE_16X16;
1223  }
1224  }
1225  } else { /* I-Frame */
1226  s->mb_intra = 1;
1228  }
1229 
1230  if (!IS_SKIP(mb_type)) {
1231  int i;
1232  s->bdsp.clear_blocks(s->block[0]);
1233  /* decode each block */
1234  for (i = 0; i < 6; i++) {
1235  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1237  "texture corrupted at %d %d %d\n",
1238  s->mb_x, s->mb_y, s->mb_intra);
1239  return -1;
1240  }
1241  cbp += cbp;
1242  }
1243  }
1244 
1245  /* per-MB end of slice check */
1246  if (--s->mb_num_left <= 0) {
1247  if (mpeg4_is_resync(s))
1248  return SLICE_END;
1249  else
1250  return SLICE_NOEND;
1251  } else {
1252  if (mpeg4_is_resync(s)) {
1253  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1254  if (s->cbp_table[xy + delta])
1255  return SLICE_END;
1256  }
1257  return SLICE_OK;
1258  }
1259 }
1260 
1261 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1262 {
1263  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1264  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1265  int16_t *mot_val;
1266  static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1267  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1268 
1269  assert(s->h263_pred);
1270 
1271  if (s->pict_type == AV_PICTURE_TYPE_P ||
1272  s->pict_type == AV_PICTURE_TYPE_S) {
1273  do {
1274  if (get_bits1(&s->gb)) {
1275  /* skip mb */
1276  s->mb_intra = 0;
1277  for (i = 0; i < 6; i++)
1278  s->block_last_index[i] = -1;
1279  s->mv_dir = MV_DIR_FORWARD;
1280  s->mv_type = MV_TYPE_16X16;
1281  if (s->pict_type == AV_PICTURE_TYPE_S &&
1282  ctx->vol_sprite_usage == GMC_SPRITE) {
1284  MB_TYPE_GMC |
1285  MB_TYPE_16x16 |
1286  MB_TYPE_L0;
1287  s->mcsel = 1;
1288  s->mv[0][0][0] = get_amv(ctx, 0);
1289  s->mv[0][0][1] = get_amv(ctx, 1);
1290  s->mb_skipped = 0;
1291  } else {
1293  MB_TYPE_16x16 |
1294  MB_TYPE_L0;
1295  s->mcsel = 0;
1296  s->mv[0][0][0] = 0;
1297  s->mv[0][0][1] = 0;
1298  s->mb_skipped = 1;
1299  }
1300  goto end;
1301  }
1303  if (cbpc < 0) {
1305  "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1306  return -1;
1307  }
1308  } while (cbpc == 20);
1309 
1310  s->bdsp.clear_blocks(s->block[0]);
1311  dquant = cbpc & 8;
1312  s->mb_intra = ((cbpc & 4) != 0);
1313  if (s->mb_intra)
1314  goto intra;
1315 
1316  if (s->pict_type == AV_PICTURE_TYPE_S &&
1317  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1318  s->mcsel = get_bits1(&s->gb);
1319  else
1320  s->mcsel = 0;
1321  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1322 
1323  cbp = (cbpc & 3) | (cbpy << 2);
1324  if (dquant)
1325  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1326  if ((!s->progressive_sequence) &&
1327  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1328  s->interlaced_dct = get_bits1(&s->gb);
1329 
1330  s->mv_dir = MV_DIR_FORWARD;
1331  if ((cbpc & 16) == 0) {
1332  if (s->mcsel) {
1334  MB_TYPE_16x16 |
1335  MB_TYPE_L0;
1336  /* 16x16 global motion prediction */
1337  s->mv_type = MV_TYPE_16X16;
1338  mx = get_amv(ctx, 0);
1339  my = get_amv(ctx, 1);
1340  s->mv[0][0][0] = mx;
1341  s->mv[0][0][1] = my;
1342  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1344  MB_TYPE_L0 |
1346  /* 16x8 field motion prediction */
1347  s->mv_type = MV_TYPE_FIELD;
1348 
1349  s->field_select[0][0] = get_bits1(&s->gb);
1350  s->field_select[0][1] = get_bits1(&s->gb);
1351 
1352  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1353 
1354  for (i = 0; i < 2; i++) {
1355  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1356  if (mx >= 0xffff)
1357  return -1;
1358 
1359  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1360  if (my >= 0xffff)
1361  return -1;
1362 
1363  s->mv[0][i][0] = mx;
1364  s->mv[0][i][1] = my;
1365  }
1366  } else {
1368  /* 16x16 motion prediction */
1369  s->mv_type = MV_TYPE_16X16;
1370  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1371  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1372 
1373  if (mx >= 0xffff)
1374  return -1;
1375 
1376  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1377 
1378  if (my >= 0xffff)
1379  return -1;
1380  s->mv[0][0][0] = mx;
1381  s->mv[0][0][1] = my;
1382  }
1383  } else {
1385  s->mv_type = MV_TYPE_8X8;
1386  for (i = 0; i < 4; i++) {
1387  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1388  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1389  if (mx >= 0xffff)
1390  return -1;
1391 
1392  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1393  if (my >= 0xffff)
1394  return -1;
1395  s->mv[0][i][0] = mx;
1396  s->mv[0][i][1] = my;
1397  mot_val[0] = mx;
1398  mot_val[1] = my;
1399  }
1400  }
1401  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1402  int modb1; // first bit of modb
1403  int modb2; // second bit of modb
1404  int mb_type;
1405 
1406  s->mb_intra = 0; // B-frames never contain intra blocks
1407  s->mcsel = 0; // ... true gmc blocks
1408 
1409  if (s->mb_x == 0) {
1410  for (i = 0; i < 2; i++) {
1411  s->last_mv[i][0][0] =
1412  s->last_mv[i][0][1] =
1413  s->last_mv[i][1][0] =
1414  s->last_mv[i][1][1] = 0;
1415  }
1416 
1418  }
1419 
1420  /* if we skipped it in the future P Frame than skip it now too */
1421  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1422 
1423  if (s->mb_skipped) {
1424  /* skip mb */
1425  for (i = 0; i < 6; i++)
1426  s->block_last_index[i] = -1;
1427 
1428  s->mv_dir = MV_DIR_FORWARD;
1429  s->mv_type = MV_TYPE_16X16;
1430  s->mv[0][0][0] =
1431  s->mv[0][0][1] =
1432  s->mv[1][0][0] =
1433  s->mv[1][0][1] = 0;
1435  MB_TYPE_16x16 |
1436  MB_TYPE_L0;
1437  goto end;
1438  }
1439 
1440  modb1 = get_bits1(&s->gb);
1441  if (modb1) {
1442  // like MB_TYPE_B_DIRECT but no vectors coded
1444  cbp = 0;
1445  } else {
1446  modb2 = get_bits1(&s->gb);
1447  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1448  if (mb_type < 0) {
1449  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1450  return -1;
1451  }
1452  mb_type = mb_type_b_map[mb_type];
1453  if (modb2) {
1454  cbp = 0;
1455  } else {
1456  s->bdsp.clear_blocks(s->block[0]);
1457  cbp = get_bits(&s->gb, 6);
1458  }
1459 
1460  if ((!IS_DIRECT(mb_type)) && cbp) {
1461  if (get_bits1(&s->gb))
1462  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1463  }
1464 
1465  if (!s->progressive_sequence) {
1466  if (cbp)
1467  s->interlaced_dct = get_bits1(&s->gb);
1468 
1469  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1470  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1471  mb_type &= ~MB_TYPE_16x16;
1472 
1473  if (USES_LIST(mb_type, 0)) {
1474  s->field_select[0][0] = get_bits1(&s->gb);
1475  s->field_select[0][1] = get_bits1(&s->gb);
1476  }
1477  if (USES_LIST(mb_type, 1)) {
1478  s->field_select[1][0] = get_bits1(&s->gb);
1479  s->field_select[1][1] = get_bits1(&s->gb);
1480  }
1481  }
1482  }
1483 
1484  s->mv_dir = 0;
1485  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1486  s->mv_type = MV_TYPE_16X16;
1487 
1488  if (USES_LIST(mb_type, 0)) {
1489  s->mv_dir = MV_DIR_FORWARD;
1490 
1491  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1492  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1493  s->last_mv[0][1][0] =
1494  s->last_mv[0][0][0] =
1495  s->mv[0][0][0] = mx;
1496  s->last_mv[0][1][1] =
1497  s->last_mv[0][0][1] =
1498  s->mv[0][0][1] = my;
1499  }
1500 
1501  if (USES_LIST(mb_type, 1)) {
1502  s->mv_dir |= MV_DIR_BACKWARD;
1503 
1504  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1505  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1506  s->last_mv[1][1][0] =
1507  s->last_mv[1][0][0] =
1508  s->mv[1][0][0] = mx;
1509  s->last_mv[1][1][1] =
1510  s->last_mv[1][0][1] =
1511  s->mv[1][0][1] = my;
1512  }
1513  } else if (!IS_DIRECT(mb_type)) {
1514  s->mv_type = MV_TYPE_FIELD;
1515 
1516  if (USES_LIST(mb_type, 0)) {
1517  s->mv_dir = MV_DIR_FORWARD;
1518 
1519  for (i = 0; i < 2; i++) {
1520  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1521  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1522  s->last_mv[0][i][0] =
1523  s->mv[0][i][0] = mx;
1524  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1525  }
1526  }
1527 
1528  if (USES_LIST(mb_type, 1)) {
1529  s->mv_dir |= MV_DIR_BACKWARD;
1530 
1531  for (i = 0; i < 2; i++) {
1532  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1533  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1534  s->last_mv[1][i][0] =
1535  s->mv[1][i][0] = mx;
1536  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1537  }
1538  }
1539  }
1540  }
1541 
1542  if (IS_DIRECT(mb_type)) {
1543  if (IS_SKIP(mb_type)) {
1544  mx =
1545  my = 0;
1546  } else {
1547  mx = ff_h263_decode_motion(s, 0, 1);
1548  my = ff_h263_decode_motion(s, 0, 1);
1549  }
1550 
1552  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1553  }
1554  s->current_picture.mb_type[xy] = mb_type;
1555  } else { /* I-Frame */
1556  do {
1558  if (cbpc < 0) {
1560  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1561  return -1;
1562  }
1563  } while (cbpc == 8);
1564 
1565  dquant = cbpc & 4;
1566  s->mb_intra = 1;
1567 
1568 intra:
1569  s->ac_pred = get_bits1(&s->gb);
1570  if (s->ac_pred)
1572  else
1574 
1575  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1576  if (cbpy < 0) {
1578  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1579  return -1;
1580  }
1581  cbp = (cbpc & 3) | (cbpy << 2);
1582 
1583  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1584 
1585  if (dquant)
1586  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1587 
1588  if (!s->progressive_sequence)
1589  s->interlaced_dct = get_bits1(&s->gb);
1590 
1591  s->bdsp.clear_blocks(s->block[0]);
1592  /* decode each block */
1593  for (i = 0; i < 6; i++) {
1594  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1595  return -1;
1596  cbp += cbp;
1597  }
1598  goto end;
1599  }
1600 
1601  /* decode each block */
1602  for (i = 0; i < 6; i++) {
1603  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1604  return -1;
1605  cbp += cbp;
1606  }
1607 
1608 end:
1609  /* per-MB end of slice check */
1610  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1611  if (mpeg4_is_resync(s)) {
1612  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1613 
1614  if (s->pict_type == AV_PICTURE_TYPE_B &&
1615  s->next_picture.mbskip_table[xy + delta]) {
1617  (s->mb_x + delta >= s->mb_width)
1618  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1619  : s->mb_y, 0);
1620  }
1621 
1622  if (s->pict_type == AV_PICTURE_TYPE_B &&
1623  s->next_picture.mbskip_table[xy + delta])
1624  return SLICE_OK;
1625  return SLICE_END;
1626  }
1627  }
1628 
1629  return SLICE_OK;
1630 }
1631 
1633 {
1634  int hours, minutes, seconds;
1635  unsigned time_code = show_bits(gb, 18);
1636 
1637  if (time_code & 0x40) { /* marker_bit */
1638  hours = time_code >> 13;
1639  minutes = time_code >> 7 & 0x3f;
1640  seconds = time_code & 0x3f;
1641  s->time_base = seconds + 60 * (minutes + 60 * hours);
1642  skip_bits(gb, 20); /* time_code, closed_gov, broken_link */
1643  } else {
1644  av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n");
1645  }
1646 
1647  return 0;
1648 }
1649 
1651 {
1652  int profile_and_level_indication;
1653 
1654  profile_and_level_indication = get_bits(gb, 8);
1655 
1656  s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4;
1657  s->avctx->level = (profile_and_level_indication & 0x0f);
1658 
1659  // for Simple profile, level 0
1660  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1661  s->avctx->level = 0;
1662  }
1663 
1664  return 0;
1665 }
1666 
1668 {
1669  MpegEncContext *s = &ctx->m;
1670  int width, height, vo_ver_id;
1671 
1672  /* vol header */
1673  skip_bits(gb, 1); /* random access */
1674  s->vo_type = get_bits(gb, 8);
1675  if (get_bits1(gb) != 0) { /* is_ol_id */
1676  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1677  skip_bits(gb, 3); /* vo_priority */
1678  } else {
1679  vo_ver_id = 1;
1680  }
1681  s->aspect_ratio_info = get_bits(gb, 4);
1683  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1684  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1685  } else {
1687  }
1688 
1689  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1690  int chroma_format = get_bits(gb, 2);
1691  if (chroma_format != CHROMA_420)
1692  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1693 
1694  s->low_delay = get_bits1(gb);
1695  if (get_bits1(gb)) { /* vbv parameters */
1696  get_bits(gb, 15); /* first_half_bitrate */
1697  skip_bits1(gb); /* marker */
1698  get_bits(gb, 15); /* latter_half_bitrate */
1699  skip_bits1(gb); /* marker */
1700  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1701  skip_bits1(gb); /* marker */
1702  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1703  get_bits(gb, 11); /* first_half_vbv_occupancy */
1704  skip_bits1(gb); /* marker */
1705  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1706  skip_bits1(gb); /* marker */
1707  }
1708  } else {
1709  /* is setting low delay flag only once the smartest thing to do?
1710  * low delay detection won't be overriden. */
1711  if (s->picture_number == 0)
1712  s->low_delay = 0;
1713  }
1714 
1715  ctx->shape = get_bits(gb, 2); /* vol shape */
1716  if (ctx->shape != RECT_SHAPE)
1717  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1718  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1719  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1720  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1721  }
1722 
1723  check_marker(gb, "before time_increment_resolution");
1724 
1725  s->avctx->time_base.den = get_bits(gb, 16);
1726  if (!s->avctx->time_base.den) {
1727  av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1728  s->avctx->time_base.num = 0;
1729  return -1;
1730  }
1731 
1732  ctx->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1733  if (ctx->time_increment_bits < 1)
1734  ctx->time_increment_bits = 1;
1735 
1736  check_marker(gb, "before fixed_vop_rate");
1737 
1738  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1740  else
1741  s->avctx->time_base.num = 1;
1742 
1743  ctx->t_frame = 0;
1744 
1745  if (ctx->shape != BIN_ONLY_SHAPE) {
1746  if (ctx->shape == RECT_SHAPE) {
1747  skip_bits1(gb); /* marker */
1748  width = get_bits(gb, 13);
1749  skip_bits1(gb); /* marker */
1750  height = get_bits(gb, 13);
1751  skip_bits1(gb); /* marker */
1752  if (width && height && /* they should be non zero but who knows */
1753  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1754  if (s->width && s->height &&
1755  (s->width != width || s->height != height))
1756  s->context_reinit = 1;
1757  s->width = width;
1758  s->height = height;
1759  }
1760  }
1761 
1763  s->progressive_frame = get_bits1(gb) ^ 1;
1764  s->interlaced_dct = 0;
1765  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1766  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1767  "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1768  if (vo_ver_id == 1)
1769  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1770  else
1771  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1772 
1773  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1774  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1775  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1776  ctx->vol_sprite_usage == GMC_SPRITE) {
1777  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1778  skip_bits(gb, 13); // sprite_width
1779  skip_bits1(gb); /* marker */
1780  skip_bits(gb, 13); // sprite_height
1781  skip_bits1(gb); /* marker */
1782  skip_bits(gb, 13); // sprite_left
1783  skip_bits1(gb); /* marker */
1784  skip_bits(gb, 13); // sprite_top
1785  skip_bits1(gb); /* marker */
1786  }
1787  ctx->num_sprite_warping_points = get_bits(gb, 6);
1788  if (ctx->num_sprite_warping_points > 3) {
1790  "%d sprite_warping_points\n",
1792  ctx->num_sprite_warping_points = 0;
1793  return -1;
1794  }
1795  s->sprite_warping_accuracy = get_bits(gb, 2);
1797  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1798  skip_bits1(gb); // low_latency_sprite
1799  }
1800  // FIXME sadct disable bit if verid!=1 && shape not rect
1801 
1802  if (get_bits1(gb) == 1) { /* not_8_bit */
1803  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1804  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1805  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1806  if (s->quant_precision != 5)
1808  "quant precision %d\n", s->quant_precision);
1809  } else {
1810  s->quant_precision = 5;
1811  }
1812 
1813  // FIXME a bunch of grayscale shape things
1814 
1815  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1816  int i, v;
1817 
1818  /* load default matrixes */
1819  for (i = 0; i < 64; i++) {
1820  int j = s->idsp.idct_permutation[i];
1822  s->intra_matrix[j] = v;
1823  s->chroma_intra_matrix[j] = v;
1824 
1826  s->inter_matrix[j] = v;
1827  s->chroma_inter_matrix[j] = v;
1828  }
1829 
1830  /* load custom intra matrix */
1831  if (get_bits1(gb)) {
1832  int last = 0;
1833  for (i = 0; i < 64; i++) {
1834  int j;
1835  v = get_bits(gb, 8);
1836  if (v == 0)
1837  break;
1838 
1839  last = v;
1841  s->intra_matrix[j] = last;
1842  s->chroma_intra_matrix[j] = last;
1843  }
1844 
1845  /* replicate last value */
1846  for (; i < 64; i++) {
1847  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1848  s->intra_matrix[j] = last;
1849  s->chroma_intra_matrix[j] = last;
1850  }
1851  }
1852 
1853  /* load custom non intra matrix */
1854  if (get_bits1(gb)) {
1855  int last = 0;
1856  for (i = 0; i < 64; i++) {
1857  int j;
1858  v = get_bits(gb, 8);
1859  if (v == 0)
1860  break;
1861 
1862  last = v;
1864  s->inter_matrix[j] = v;
1865  s->chroma_inter_matrix[j] = v;
1866  }
1867 
1868  /* replicate last value */
1869  for (; i < 64; i++) {
1870  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1871  s->inter_matrix[j] = last;
1872  s->chroma_inter_matrix[j] = last;
1873  }
1874  }
1875 
1876  // FIXME a bunch of grayscale shape things
1877  }
1878 
1879  if (vo_ver_id != 1)
1880  s->quarter_sample = get_bits1(gb);
1881  else
1882  s->quarter_sample = 0;
1883 
1884  if (!get_bits1(gb)) {
1885  int pos = get_bits_count(gb);
1886  int estimation_method = get_bits(gb, 2);
1887  if (estimation_method < 2) {
1888  if (!get_bits1(gb)) {
1889  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1890  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1891  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1892  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1893  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1894  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1895  }
1896  if (!get_bits1(gb)) {
1897  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1898  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1899  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1900  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1901  }
1902  if (!check_marker(gb, "in complexity estimation part 1")) {
1903  skip_bits_long(gb, pos - get_bits_count(gb));
1904  goto no_cplx_est;
1905  }
1906  if (!get_bits1(gb)) {
1907  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1908  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1909  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1910  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1911  }
1912  if (!get_bits1(gb)) {
1913  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1914  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1915  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1916  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1917  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1918  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1919  }
1920  if (!check_marker(gb, "in complexity estimation part 2")) {
1921  skip_bits_long(gb, pos - get_bits_count(gb));
1922  goto no_cplx_est;
1923  }
1924  if (estimation_method == 1) {
1925  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1926  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1927  }
1928  } else
1930  "Invalid Complexity estimation method %d\n",
1931  estimation_method);
1932  } else {
1933 
1934 no_cplx_est:
1937  ctx->cplx_estimation_trash_b = 0;
1938  }
1939 
1940  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1941 
1942  s->data_partitioning = get_bits1(gb);
1943  if (s->data_partitioning)
1944  ctx->rvlc = get_bits1(gb);
1945 
1946  if (vo_ver_id != 1) {
1947  ctx->new_pred = get_bits1(gb);
1948  if (ctx->new_pred) {
1949  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1950  skip_bits(gb, 2); /* requested upstream message type */
1951  skip_bits1(gb); /* newpred segment type */
1952  }
1953  if (get_bits1(gb)) // reduced_res_vop
1955  "reduced resolution VOP not supported\n");
1956  } else {
1957  ctx->new_pred = 0;
1958  }
1959 
1960  ctx->scalability = get_bits1(gb);
1961 
1962  if (ctx->scalability) {
1963  GetBitContext bak = *gb;
1964  int h_sampling_factor_n;
1965  int h_sampling_factor_m;
1966  int v_sampling_factor_n;
1967  int v_sampling_factor_m;
1968 
1969  skip_bits1(gb); // hierarchy_type
1970  skip_bits(gb, 4); /* ref_layer_id */
1971  skip_bits1(gb); /* ref_layer_sampling_dir */
1972  h_sampling_factor_n = get_bits(gb, 5);
1973  h_sampling_factor_m = get_bits(gb, 5);
1974  v_sampling_factor_n = get_bits(gb, 5);
1975  v_sampling_factor_m = get_bits(gb, 5);
1976  ctx->enhancement_type = get_bits1(gb);
1977 
1978  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
1979  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
1980  /* illegal scalability header (VERY broken encoder),
1981  * trying to workaround */
1982  ctx->scalability = 0;
1983  *gb = bak;
1984  } else
1985  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1986 
1987  // bin shape stuff FIXME
1988  }
1989  }
1990 
1991  return 0;
1992 }
1993 
1999 {
2000  MpegEncContext *s = &ctx->m;
2001  char buf[256];
2002  int i;
2003  int e;
2004  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2005  char last;
2006 
2007  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2008  if (show_bits(gb, 23) == 0)
2009  break;
2010  buf[i] = get_bits(gb, 8);
2011  }
2012  buf[i] = 0;
2013 
2014  /* divx detection */
2015  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2016  if (e < 2)
2017  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2018  if (e >= 2) {
2019  ctx->divx_version = ver;
2020  ctx->divx_build = build;
2021  s->divx_packed = e == 3 && last == 'p';
2022  if (s->divx_packed && !ctx->showed_packed_warning) {
2024  "Invalid and inefficient vfw-avi packed B frames detected\n");
2025  ctx->showed_packed_warning = 1;
2026  }
2027  }
2028 
2029  /* libavcodec detection */
2030  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2031  if (e != 4)
2032  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2033  if (e != 4) {
2034  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2035  if (e > 1)
2036  build = (ver << 16) + (ver2 << 8) + ver3;
2037  }
2038  if (e != 4) {
2039  if (strcmp(buf, "ffmpeg") == 0)
2040  ctx->lavc_build = 4600;
2041  }
2042  if (e == 4)
2043  ctx->lavc_build = build;
2044 
2045  /* Xvid detection */
2046  e = sscanf(buf, "XviD%d", &build);
2047  if (e == 1)
2048  ctx->xvid_build = build;
2049 
2050  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2051  if (s->stream_codec_tag == AV_RL32("XVID") ||
2052  s->codec_tag == AV_RL32("XVID") ||
2053  s->codec_tag == AV_RL32("XVIX") ||
2054  s->codec_tag == AV_RL32("RMP4") ||
2055  s->codec_tag == AV_RL32("ZMP4") ||
2056  s->codec_tag == AV_RL32("SIPP"))
2057  ctx->xvid_build = 0;
2058  }
2059 
2060  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2061  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2062  ctx->vol_control_parameters == 0)
2063  ctx->divx_version = 400; // divx 4
2064 
2065  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2066  ctx->divx_version =
2067  ctx->divx_build = -1;
2068  }
2069 
2070  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0)
2071  ff_xvididct_init(&s->idsp, s->avctx);
2072 
2073  return 0;
2074 }
2075 
2077 {
2078  MpegEncContext *s = &ctx->m;
2079  int time_incr, time_increment;
2080 
2081  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2082  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2083  ctx->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) {
2084  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
2085  s->low_delay = 0;
2086  }
2087 
2089  if (s->partitioned_frame)
2091  else
2093 
2094  time_incr = 0;
2095  while (get_bits1(gb) != 0)
2096  time_incr++;
2097 
2098  check_marker(gb, "before time_increment");
2099 
2100  if (ctx->time_increment_bits == 0 ||
2101  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2103  "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
2104 
2105  for (ctx->time_increment_bits = 1;
2106  ctx->time_increment_bits < 16;
2107  ctx->time_increment_bits++) {
2108  if (s->pict_type == AV_PICTURE_TYPE_P ||
2109  (s->pict_type == AV_PICTURE_TYPE_S &&
2110  ctx->vol_sprite_usage == GMC_SPRITE)) {
2111  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2112  break;
2113  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2114  break;
2115  }
2116 
2118  "my guess is %d bits ;)\n", ctx->time_increment_bits);
2119  }
2120 
2121  if (IS_3IV1)
2122  time_increment = get_bits1(gb); // FIXME investigate further
2123  else
2124  time_increment = get_bits(gb, ctx->time_increment_bits);
2125 
2126  if (s->pict_type != AV_PICTURE_TYPE_B) {
2127  s->last_time_base = s->time_base;
2128  s->time_base += time_incr;
2129  s->time = s->time_base * s->avctx->time_base.den + time_increment;
2130  if (s->workaround_bugs & FF_BUG_UMP4) {
2131  if (s->time < s->last_non_b_time) {
2132  /* header is not mpeg-4-compatible, broken encoder,
2133  * trying to workaround */
2134  s->time_base++;
2135  s->time += s->avctx->time_base.den;
2136  }
2137  }
2138  s->pp_time = s->time - s->last_non_b_time;
2139  s->last_non_b_time = s->time;
2140  } else {
2141  s->time = (s->last_time_base + time_incr) * s->avctx->time_base.den + time_increment;
2142  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2143  if (s->pp_time <= s->pb_time ||
2144  s->pp_time <= s->pp_time - s->pb_time ||
2145  s->pp_time <= 0) {
2146  /* messed up order, maybe after seeking? skipping current b-frame */
2147  return FRAME_SKIPPED;
2148  }
2150 
2151  if (ctx->t_frame == 0)
2152  ctx->t_frame = s->pb_time;
2153  if (ctx->t_frame == 0)
2154  ctx->t_frame = 1; // 1/0 protection
2156  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2157  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2158  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2159  if (!s->progressive_sequence) {
2160  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
2161  return FRAME_SKIPPED;
2162  }
2163  }
2164 
2165  check_marker(gb, "before vop_coded");
2166 
2167  /* vop coded */
2168  if (get_bits1(gb) != 1) {
2169  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2170  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2171  return FRAME_SKIPPED;
2172  }
2173  if (ctx->shape != BIN_ONLY_SHAPE &&
2174  (s->pict_type == AV_PICTURE_TYPE_P ||
2175  (s->pict_type == AV_PICTURE_TYPE_S &&
2176  ctx->vol_sprite_usage == GMC_SPRITE))) {
2177  /* rounding type for motion estimation */
2178  s->no_rounding = get_bits1(gb);
2179  } else {
2180  s->no_rounding = 0;
2181  }
2182  // FIXME reduced res stuff
2183 
2184  if (ctx->shape != RECT_SHAPE) {
2185  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2186  skip_bits(gb, 13); /* width */
2187  skip_bits1(gb); /* marker */
2188  skip_bits(gb, 13); /* height */
2189  skip_bits1(gb); /* marker */
2190  skip_bits(gb, 13); /* hor_spat_ref */
2191  skip_bits1(gb); /* marker */
2192  skip_bits(gb, 13); /* ver_spat_ref */
2193  }
2194  skip_bits1(gb); /* change_CR_disable */
2195 
2196  if (get_bits1(gb) != 0)
2197  skip_bits(gb, 8); /* constant_alpha_value */
2198  }
2199 
2200  // FIXME complexity estimation stuff
2201 
2202  if (ctx->shape != BIN_ONLY_SHAPE) {
2204  if (s->pict_type != AV_PICTURE_TYPE_I)
2206  if (s->pict_type == AV_PICTURE_TYPE_B)
2208 
2210  if (!s->progressive_sequence) {
2211  s->top_field_first = get_bits1(gb);
2212  s->alternate_scan = get_bits1(gb);
2213  } else
2214  s->alternate_scan = 0;
2215  }
2216 
2217  if (s->alternate_scan) {
2222  } else {
2227  }
2228 
2229  if (s->pict_type == AV_PICTURE_TYPE_S &&
2230  (ctx->vol_sprite_usage == STATIC_SPRITE ||
2231  ctx->vol_sprite_usage == GMC_SPRITE)) {
2232  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2233  return AVERROR_INVALIDDATA;
2234  if (ctx->sprite_brightness_change)
2236  "sprite_brightness_change not supported\n");
2237  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2238  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2239  }
2240 
2241  if (ctx->shape != BIN_ONLY_SHAPE) {
2242  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2243  if (s->qscale == 0) {
2245  "Error, header damaged or not MPEG4 header (qscale=0)\n");
2246  return -1; // makes no sense to continue, as there is nothing left from the image then
2247  }
2248 
2249  if (s->pict_type != AV_PICTURE_TYPE_I) {
2250  s->f_code = get_bits(gb, 3); /* fcode_for */
2251  if (s->f_code == 0) {
2253  "Error, header damaged or not MPEG4 header (f_code=0)\n");
2254  return -1; // makes no sense to continue, as there is nothing left from the image then
2255  }
2256  } else
2257  s->f_code = 1;
2258 
2259  if (s->pict_type == AV_PICTURE_TYPE_B) {
2260  s->b_code = get_bits(gb, 3);
2261  } else
2262  s->b_code = 1;
2263 
2264  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2266  "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",
2267  s->qscale, s->f_code, s->b_code,
2268  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")),
2270  s->top_field_first, s->quarter_sample ? "q" : "h",
2273  1 - s->no_rounding, s->vo_type,
2274  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2277  }
2278 
2279  if (!ctx->scalability) {
2280  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2281  skip_bits1(gb); // vop shape coding type
2282  } else {
2283  if (ctx->enhancement_type) {
2284  int load_backward_shape = get_bits1(gb);
2285  if (load_backward_shape)
2287  "load backward shape isn't supported\n");
2288  }
2289  skip_bits(gb, 2); // ref_select_code
2290  }
2291  }
2292  /* detect buggy encoders which don't set the low_delay flag
2293  * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2294  * easily (although it's buggy too) */
2295  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2296  ctx->divx_version == -1 && s->picture_number == 0) {
2298  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2299  s->low_delay = 1;
2300  }
2301 
2302  s->picture_number++; // better than pic number==0 always ;)
2303 
2304  // FIXME add short header support
2307 
2308  if (s->workaround_bugs & FF_BUG_EDGE) {
2309  s->h_edge_pos = s->width;
2310  s->v_edge_pos = s->height;
2311  }
2312  return 0;
2313 }
2314 
2322 {
2323  MpegEncContext *s = &ctx->m;
2324  unsigned startcode, v;
2325 
2326  /* search next start code */
2327  align_get_bits(gb);
2328 
2329  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2330  skip_bits(gb, 24);
2331  if (get_bits(gb, 8) == 0xF0)
2332  goto end;
2333  }
2334 
2335  startcode = 0xff;
2336  for (;;) {
2337  if (get_bits_count(gb) >= gb->size_in_bits) {
2338  if (gb->size_in_bits == 8 &&
2339  (ctx->divx_version >= 0 || ctx->xvid_build >= 0)) {
2340  av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2341  return FRAME_SKIPPED; // divx bug
2342  } else
2343  return -1; // end of stream
2344  }
2345 
2346  /* use the bits after the test */
2347  v = get_bits(gb, 8);
2348  startcode = ((startcode << 8) | v) & 0xffffffff;
2349 
2350  if ((startcode & 0xFFFFFF00) != 0x100)
2351  continue; // no startcode
2352 
2353  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2354  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2355  if (startcode <= 0x11F)
2356  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2357  else if (startcode <= 0x12F)
2358  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2359  else if (startcode <= 0x13F)
2360  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2361  else if (startcode <= 0x15F)
2362  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2363  else if (startcode <= 0x1AF)
2364  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2365  else if (startcode == 0x1B0)
2366  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2367  else if (startcode == 0x1B1)
2368  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2369  else if (startcode == 0x1B2)
2370  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2371  else if (startcode == 0x1B3)
2372  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2373  else if (startcode == 0x1B4)
2374  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2375  else if (startcode == 0x1B5)
2376  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2377  else if (startcode == 0x1B6)
2378  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2379  else if (startcode == 0x1B7)
2380  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2381  else if (startcode == 0x1B8)
2382  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2383  else if (startcode == 0x1B9)
2384  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2385  else if (startcode == 0x1BA)
2386  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2387  else if (startcode == 0x1BB)
2388  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2389  else if (startcode == 0x1BC)
2390  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2391  else if (startcode == 0x1BD)
2392  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2393  else if (startcode == 0x1BE)
2394  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2395  else if (startcode == 0x1BF)
2396  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2397  else if (startcode == 0x1C0)
2398  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2399  else if (startcode == 0x1C1)
2400  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2401  else if (startcode == 0x1C2)
2402  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2403  else if (startcode == 0x1C3)
2404  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2405  else if (startcode <= 0x1C5)
2406  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2407  else if (startcode <= 0x1FF)
2408  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2409  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2410  }
2411 
2412  if (startcode >= 0x120 && startcode <= 0x12F) {
2413  if (decode_vol_header(ctx, gb) < 0)
2414  return -1;
2415  } else if (startcode == USER_DATA_STARTCODE) {
2416  decode_user_data(ctx, gb);
2417  } else if (startcode == GOP_STARTCODE) {
2418  mpeg4_decode_gop_header(s, gb);
2419  } else if (startcode == VOS_STARTCODE) {
2421  } else if (startcode == VOP_STARTCODE) {
2422  break;
2423  }
2424 
2425  align_get_bits(gb);
2426  startcode = 0xff;
2427  }
2428 
2429 end:
2430  if (s->flags & CODEC_FLAG_LOW_DELAY)
2431  s->low_delay = 1;
2432  s->avctx->has_b_frames = !s->low_delay;
2433 
2435  if (s->codec_tag == AV_RL32("XVIX"))
2437 
2438  if (s->codec_tag == AV_RL32("UMP4"))
2440 
2441  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2443 
2444  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2446 
2447  if (ctx->xvid_build <= 3U)
2448  s->padding_bug_score = 256 * 256 * 256 * 64;
2449 
2450  if (ctx->xvid_build <= 1U)
2452 
2453  if (ctx->xvid_build <= 12U)
2455 
2456  if (ctx->xvid_build <= 32U)
2458 
2459  if (ctx->lavc_build < 4653U)
2461 
2462  if (ctx->lavc_build < 4655U)
2464 
2465  if (ctx->lavc_build < 4670U)
2467 
2468  if (ctx->lavc_build <= 4712U)
2470 
2471  if (ctx->divx_version >= 0)
2473 
2474  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2475  s->padding_bug_score = 256 * 256 * 256 * 64;
2476 
2477  if (ctx->divx_version < 500U)
2479 
2480  if (ctx->divx_version >= 0)
2482  }
2483 
2484 
2485  if (s->avctx->debug & FF_DEBUG_BUGS)
2487  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2488  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2489  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2490 
2491  return decode_vop_header(ctx, gb);
2492 }
2493 
2494 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2495 {
2496  Mpeg4DecContext *ctx = avctx->priv_data;
2497  MpegEncContext *s = &ctx->m;
2498 
2499  /* divx 5.01+ bistream reorder stuff */
2500  if (s->divx_packed) {
2501  int current_pos = get_bits_count(&s->gb) >> 3;
2502  int startcode_found = 0;
2503 
2504  if (buf_size - current_pos > 5) {
2505  int i;
2506  for (i = current_pos; i < buf_size - 3; i++)
2507  if (buf[i] == 0 &&
2508  buf[i + 1] == 0 &&
2509  buf[i + 2] == 1 &&
2510  buf[i + 3] == 0xB6) {
2511  startcode_found = 1;
2512  break;
2513  }
2514  }
2515  if (s->gb.buffer == s->bitstream_buffer && buf_size > 7 &&
2516  ctx->xvid_build >= 0) { // xvid style
2517  startcode_found = 1;
2518  current_pos = 0;
2519  }
2520 
2521  if (startcode_found) {
2524  buf_size - current_pos +
2526  if (!s->bitstream_buffer)
2527  return AVERROR(ENOMEM);
2528  memcpy(s->bitstream_buffer, buf + current_pos,
2529  buf_size - current_pos);
2530  s->bitstream_buffer_size = buf_size - current_pos;
2531  }
2532  }
2533 
2534  return 0;
2535 }
2536 
2538  const AVCodecContext *src)
2539 {
2540  Mpeg4DecContext *s = dst->priv_data;
2541  const Mpeg4DecContext *s1 = src->priv_data;
2542  int init = s->m.context_initialized;
2543 
2544  int ret = ff_mpeg_update_thread_context(dst, src);
2545 
2546  if (ret < 0)
2547  return ret;
2548 
2549  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2550  ff_xvididct_init(&s->m.idsp, dst);
2551 
2552  s->shape = s1->shape;
2554  s->xvid_build = s1->xvid_build;
2555 
2556  return 0;
2557 }
2558 
2560 {
2561  Mpeg4DecContext *ctx = avctx->priv_data;
2562  MpegEncContext *s = &ctx->m;
2563  int ret;
2564  static int done = 0;
2565 
2566  ctx->divx_version =
2567  ctx->divx_build =
2568  ctx->xvid_build =
2569  ctx->lavc_build = -1;
2570 
2571  if ((ret = ff_h263_decode_init(avctx)) < 0)
2572  return ret;
2573 
2574  if (!done) {
2575  done = 1;
2576 
2583  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2584  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2585  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2586  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2587  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2588  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2589  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2590  &ff_sprite_trajectory_tab[0][1], 4, 2,
2591  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2592  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2593  &ff_mb_type_b_tab[0][1], 2, 1,
2594  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2595  }
2596 
2597  s->h263_pred = 1;
2598  s->low_delay = 0; /* default, might be overriden in the vol header during header parsing */
2600  ctx->time_increment_bits = 4; /* default value for broken headers */
2601 
2603  avctx->internal->allocate_progress = 1;
2604 
2605  return 0;
2606 }
2607 
2609  { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2610  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2611  { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2612  { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2613  { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2614  { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2615  { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2616  { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2617  { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2618  { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2619  { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2620  { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2621  { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2622  { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2623  { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2624  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2625 };
2626 
2628  .name = "mpeg4",
2629  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2630  .type = AVMEDIA_TYPE_VIDEO,
2631  .id = AV_CODEC_ID_MPEG4,
2632  .priv_data_size = sizeof(Mpeg4DecContext),
2633  .init = decode_init,
2636  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2639  .flush = ff_mpeg_flush,
2640  .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2641  .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2642  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2643 };
int last_time_base
Definition: mpegvideo.h:501
int bitstream_buffer_size
Definition: mpegvideo.h:529
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 trajectory points
Definition: mpeg4video.h:72
#define FF_PROFILE_MPEG4_SIMPLE
Definition: avcodec.h:2688
IDCTDSPContext idsp
Definition: mpegvideo.h:354
#define MB_TYPE_SKIP
Definition: avcodec.h:786
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2368
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
int aspect_ratio_info
Definition: mpegvideo.h:515
int picture_number
Definition: mpegvideo.h:253
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2328
ScanTable intra_v_scantable
Definition: mpegvideo.h:216
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
mpeg2/4, h264 default
Definition: pixfmt.h:378
#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:391
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:314
static const AVProfile profiles[]
Definition: dcadec.c:2066
int sprite_warping_accuracy
Definition: mpegvideo.h:516
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG1 & B-frame MPEG4
Definition: mpegvideo.h:400
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:606
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
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideo.c:110
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:199
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:39
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:93
int resync_marker
could this stream contain resync markers
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:685
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:423
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:320
int v_edge_pos
horizontal / vertical position of the right/bottom edge (pixel replication)
Definition: mpegvideo.h:258
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:95
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:170
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:425
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
int num
numerator
Definition: rational.h:44
uint8_t * bitstream_buffer
Definition: mpegvideo.h:528
enum AVCodecID codec_id
Definition: mpegvideo.h:235
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2340
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:57
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:1445
static av_cold int decode_init(AVCodecContext *avctx)
#define MB_TYPE_INTRA
Definition: mpegutils.h:69
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO
Definition: avcodec.h:2702
int real_sprite_warping_points
Definition: mpegvideo.h:509
#define AV_EF_BITSTREAM
Definition: avcodec.h:2431
mpegvideo header.
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1247
#define DC_VLC_BITS
Definition: mpeg4videodec.c:38
#define DC_MARKER
Definition: mpeg4video.h:54
#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE
Definition: avcodec.h:2689
uint8_t permutated[64]
Definition: idctdsp.h:31
uint8_t run
Definition: svq3.c:146
#define ER_MV_ERROR
int padding_bug_score
used to detect the VERY common padding bug in MPEG4
Definition: mpegvideo.h:524
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:603
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:259
int profile
profile
Definition: avcodec.h:2638
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2812
int time_base
time in seconds of last I,P,S Frame
Definition: mpegvideo.h:502
RLTable.
Definition: rl.h:38
int qscale
QP.
Definition: mpegvideo.h:332
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:313
int field_select[2][2]
Definition: mpegvideo.h:399
#define FF_PROFILE_MPEG4_CORE_SCALABLE
Definition: avcodec.h:2698
int block_wrap[6]
Definition: mpegvideo.h:416
int quant_precision
Definition: mpegvideo.h:513
int cplx_estimation_trash_b
Definition: mpeg4video.h:102
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:2075
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1175
int vol_sprite_usage
Definition: mpeg4video.h:68
#define USES_LIST(a, list)
Definition: mpegutils.h:95
#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:475
int64_t time
time of current frame
Definition: mpegvideo.h:503
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:46
int context_reinit
Definition: mpegvideo.h:636
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4) ...
Definition: mpegvideo.h:386
uint8_t bits
Definition: crc.c:251
uint8_t
#define av_cold
Definition: attributes.h:66
#define FF_PROFILE_MPEG4_CORE
Definition: avcodec.h:2690
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:2691
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2379
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:164
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:326
Multithreading support functions.
#define FF_BUG_EDGE
Definition: avcodec.h:2339
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:406
int enhancement_type
Definition: mpeg4video.h:84
int interlaced_dct
Definition: mpegvideo.h:589
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:306
#define CHROMA_420
Definition: mpegvideo.h:582
#define FF_PROFILE_MPEG4_N_BIT
Definition: avcodec.h:2692
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:684
int cplx_estimation_trash_p
Definition: mpeg4video.h:101
#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:2337
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2336
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:505
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:255
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:245
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.h:275
int intra_dc_threshold
QP above which the ac VLC should be used for intra dc.
Definition: mpeg4video.h:88
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1789
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:174
#define MOTION_MARKER
Definition: mpeg4video.h:53
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:756
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2459
MpegEncContext m
Definition: mpeg4video.h:63
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:510
#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:2338
int16_t * dc_val[3]
used for mpeg4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:313
#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:1355
uint8_t * mbskip_table
Definition: mpegvideo.h:113
int stream_codec_tag
internal stream_codec_tag upper case converted from avctx stream_codec_tag
Definition: mpegvideo.h:246
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:321
#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:713
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:518
#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
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
ERContext er
Definition: mpegvideo.h:638
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:2694
#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:2330
av_cold void ff_xvididct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:25
#define FF_DEBUG_BUGS
Definition: avcodec.h:2398
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:81
const char * name
Name of the codec implementation.
Definition: avcodec.h:2819
#define IS_SKIP(a)
Definition: mpegutils.h:77
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:514
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:519
GetBitContext gb
Definition: mpegvideo.h:558
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:602
#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:656
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:2429
#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:185
#define FF_PROFILE_MPEG4_SCALABLE_TEXTURE
Definition: avcodec.h:2693
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:472
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:43
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:531
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:511
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:28
#define MB_TYPE_GMC
Definition: avcodec.h:785
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideo.c:121
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:94
int err_recognition
Definition: mpegvideo.h:477
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:365
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
int progressive_frame
Definition: mpegvideo.h:587
int top_field_first
Definition: mpegvideo.h:574
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:45
#define CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:678
#define MB_TYPE_DIRECT2
Definition: avcodec.h:783
#define FFMIN(a, b)
Definition: common.h:57
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
#define IS_DIRECT(a)
Definition: mpegutils.h:80
static VLC dc_lum
Definition: mpeg4videodec.c:41
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
#define MB_TYPE_INTERLACED
Definition: avcodec.h:782
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:2700
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:643
int alternate_scan
Definition: mpegvideo.h:578
AVCodec ff_mpeg4_decoder
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:530
int size_in_bits
Definition: get_bits.h:56
int use_intra_dc_vlc
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:793
int level
level
Definition: avcodec.h:2721
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:209
#define MB_TYPE_ACPRED
Definition: avcodec.h:784
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
#define MB_TYPE_L1
Definition: avcodec.h:792
int vol_control_parameters
does the stream contain the low_delay flag, used to work around buggy encoders.
Definition: mpeg4video.h:99
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:324
#define FF_PROFILE_MPEG4_HYBRID
Definition: avcodec.h:2696
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2335
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:899
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:37
#define FF_BUG_UMP4
Definition: avcodec.h:2329
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:415
if(ac->has_optimized_func)
int * mb_index2xy
mb_index -> mb_x + mb_y*mb_stride
Definition: mpegvideo.h:419
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:388
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:546
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:385
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:424
int64_t last_non_b_time
Definition: mpegvideo.h:504
BlockDSPContext bdsp
Definition: mpegvideo.h:351
int debug
debug
Definition: avcodec.h:2378
main external API structure.
Definition: avcodec.h:1050
int cplx_estimation_trash_i
Definition: mpeg4video.h:100
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define FF_PROFILE_MPEG4_ADVANCED_SIMPLE
Definition: avcodec.h:2703
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
#define FASTDIV(a, b)
Definition: mathops.h:199
#define RSHIFT(a, b)
Definition: common.h:49
ScanTable intra_scantable
Definition: mpegvideo.h:214
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:223
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
#define CONFIG_MPEG4_DECODER
Definition: config.h:545
#define SLICE_END
end marker found
Definition: mpegvideo.h:605
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:517
int showed_packed_warning
flag for having shown the warning about invalid Divx B-frames
Definition: mpeg4video.h:96
int progressive_sequence
Definition: mpegvideo.h:566
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:215
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:325
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode mpeg4 headers.
int context_initialized
Definition: mpegvideo.h:250
#define GET_CACHE(name, gb)
Definition: get_bits.h:192
#define MB_TYPE_16x16
Definition: avcodec.h:778
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:115
#define FF_PROFILE_MPEG4_ADVANCED_CODING
Definition: avcodec.h:2699
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:165
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:81
int f_code
forward MV resolution
Definition: mpegvideo.h:362
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:127
#define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME
Definition: avcodec.h:2697
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:74
#define MV_DIR_FORWARD
Definition: mpegvideo.h:384
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:339
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2324
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:228
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
uint16_t pb_field_time
like above, just for interlaced
Definition: mpegvideo.h:508
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:315
uint8_t level
Definition: svq3.c:147
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:398
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:257
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=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);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_AARCH64) ff_audio_convert_init_aarch64(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 height
Definition: gxfenc.c:72
MpegEncContext.
Definition: mpegvideo.h:204
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:309
int8_t * qscale_table
Definition: mpegvideo.h:104
struct AVCodecContext * avctx
Definition: mpegvideo.h:221
uint16_t pp_field_time
Definition: mpegvideo.h:507
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:189
static VLC sprite_trajectory
Definition: mpeg4videodec.c:42
#define FF_BUG_AMV
Definition: avcodec.h:2331
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:388
int t_frame
time distance of first I -> B, used for interlaced B-frames
Definition: mpeg4video.h:81
common internal api header.
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:256
#define CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:755
#define TEX_VLC_BITS
Definition: dv.h:97
static av_cold void flush(AVCodecContext *avctx)
Flush (reset) the frame ID after seeking.
Definition: alsdec.c:1797
static VLC dc_chrom
Definition: mpeg4videodec.c:41
#define MB_TYPE_8x8
Definition: avcodec.h:781
Bi-dir predicted.
Definition: avutil.h:255
AVProfile.
Definition: avcodec.h:2800
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:43
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:779
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
#define IS_INTRA(x, y)
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:129
void * priv_data
Definition: avcodec.h:1092
float re
Definition: fft-test.c:69
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:28
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2392
#define IS_8X8(a)
Definition: mpegutils.h:85
int len
#define av_log2
Definition: intmath.h:85
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1100
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:473
av_cold void ff_init_rl(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: mpegvideo.c:1528
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:600
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:294
#define IS_ACPRED(a)
Definition: mpegutils.h:90
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:333
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:271
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
int flags
AVCodecContext.flags (HQ, MV4, ...)
Definition: mpegvideo.h:238
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:422
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegvideo.h:110
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:66
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:244
ScanTable inter_scantable
if inter == intra then intra should be used to reduce tha cache usage
Definition: mpegvideo.h:213
#define FRAME_SKIPPED
return value for header parsers if frame is not coded
Definition: mpegvideo.h:54
int num_sprite_warping_points
Definition: mpeg4video.h:70
#define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE
Definition: avcodec.h:2695
#define MV_TYPE_8X8
4 vectors (h263, mpeg4 4MV)
Definition: mpegvideo.h:389
int b_code
backward MV resolution for B Frames (mpeg4)
Definition: mpegvideo.h:363
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2341
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:2701
for(j=16;j >0;--j)
#define MB_TYPE_L0
Definition: avcodec.h:791
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:506
Definition: vf_drawbox.c:37
#define GMC_SPRITE
Definition: mpeg4video.h:51
static int16_t block[64]
Definition: dct-test.c:88