Libav
mpeg4videodec.c
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1 /*
2  * MPEG4 decoder.
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "error_resilience.h"
24 #include "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  /* the decoder was not properly initialized and we cannot continue */
179  if (sprite_trajectory.table == NULL)
180  return AVERROR_INVALIDDATA;
181 
182  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
183  int length;
184  int x = 0, y = 0;
185 
186  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
187  if (length)
188  x = get_xbits(gb, length);
189 
190  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
191  skip_bits1(gb); /* marker bit */
192 
193  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
194  if (length)
195  y = get_xbits(gb, length);
196 
197  skip_bits1(gb); /* marker bit */
198  ctx->sprite_traj[i][0] = d[i][0] = x;
199  ctx->sprite_traj[i][1] = d[i][1] = y;
200  }
201  for (; i < 4; i++)
202  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
203 
204  while ((1 << alpha) < w)
205  alpha++;
206  while ((1 << beta) < h)
207  beta++; /* typo in the mpeg4 std for the definition of w' and h' */
208  w2 = 1 << alpha;
209  h2 = 1 << beta;
210 
211  // Note, the 4th point isn't used for GMC
212  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
213  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
214  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
215  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
216  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
217  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
218  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
219  } else {
220  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
221  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
222  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
223  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
224  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
225  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
226  }
227  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
228  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
229 
230  /* this is mostly identical to the mpeg4 std (and is totally unreadable
231  * because of that...). Perhaps it should be reordered to be more readable.
232  * The idea behind this virtual_ref mess is to be able to use shifts later
233  * per pixel instead of divides so the distance between points is converted
234  * from w&h based to w2&h2 based which are of the 2^x form. */
235  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
236  ROUNDED_DIV(((w - w2) *
237  (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
238  w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
239  virtual_ref[0][1] = 16 * vop_ref[0][1] +
240  ROUNDED_DIV(((w - w2) *
241  (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
242  w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
243  virtual_ref[1][0] = 16 * vop_ref[0][0] +
244  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
245  h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
246  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
247  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
248  h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
249 
250  switch (ctx->num_sprite_warping_points) {
251  case 0:
252  s->sprite_offset[0][0] =
253  s->sprite_offset[0][1] =
254  s->sprite_offset[1][0] =
255  s->sprite_offset[1][1] = 0;
256  s->sprite_delta[0][0] = a;
257  s->sprite_delta[0][1] =
258  s->sprite_delta[1][0] = 0;
259  s->sprite_delta[1][1] = a;
260  ctx->sprite_shift[0] =
261  ctx->sprite_shift[1] = 0;
262  break;
263  case 1: // GMC only
264  s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
265  s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
266  s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
267  a * (vop_ref[0][0] / 2);
268  s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
269  a * (vop_ref[0][1] / 2);
270  s->sprite_delta[0][0] = a;
271  s->sprite_delta[0][1] =
272  s->sprite_delta[1][0] = 0;
273  s->sprite_delta[1][1] = a;
274  ctx->sprite_shift[0] =
275  ctx->sprite_shift[1] = 0;
276  break;
277  case 2:
278  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
279  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
280  (-vop_ref[0][0]) +
281  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
282  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
283  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
284  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
285  (-vop_ref[0][0]) +
286  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
287  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
288  s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
289  (-2 * vop_ref[0][0] + 1) +
290  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
291  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
292  sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
293  s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
294  (-2 * vop_ref[0][0] + 1) +
295  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
296  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
297  sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
298  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
299  s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
300  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
301  s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
302 
303  ctx->sprite_shift[0] = alpha + rho;
304  ctx->sprite_shift[1] = alpha + rho + 2;
305  break;
306  case 3:
307  min_ab = FFMIN(alpha, beta);
308  w3 = w2 >> min_ab;
309  h3 = h2 >> min_ab;
310  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
311  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
312  h3 * (-vop_ref[0][0]) +
313  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
314  w3 * (-vop_ref[0][1]) +
315  (1 << (alpha + beta + rho - min_ab - 1));
316  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
317  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
318  h3 * (-vop_ref[0][0]) +
319  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
320  w3 * (-vop_ref[0][1]) +
321  (1 << (alpha + beta + rho - min_ab - 1));
322  s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
323  h3 * (-2 * vop_ref[0][0] + 1) +
324  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
325  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
326  r * sprite_ref[0][0] - 16 * w2 * h3 +
327  (1 << (alpha + beta + rho - min_ab + 1));
328  s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
329  h3 * (-2 * vop_ref[0][0] + 1) +
330  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
331  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
332  r * sprite_ref[0][1] - 16 * w2 * h3 +
333  (1 << (alpha + beta + rho - min_ab + 1));
334  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
335  s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
336  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
337  s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
338 
339  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
340  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
341  break;
342  }
343  /* try to simplify the situation */
344  if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
345  s->sprite_delta[0][1] == 0 &&
346  s->sprite_delta[1][0] == 0 &&
347  s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
348  s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
349  s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
350  s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
351  s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
352  s->sprite_delta[0][0] = a;
353  s->sprite_delta[0][1] = 0;
354  s->sprite_delta[1][0] = 0;
355  s->sprite_delta[1][1] = a;
356  ctx->sprite_shift[0] = 0;
357  ctx->sprite_shift[1] = 0;
359  } else {
360  int shift_y = 16 - ctx->sprite_shift[0];
361  int shift_c = 16 - ctx->sprite_shift[1];
362  for (i = 0; i < 2; i++) {
363  s->sprite_offset[0][i] <<= shift_y;
364  s->sprite_offset[1][i] <<= shift_c;
365  s->sprite_delta[0][i] <<= shift_y;
366  s->sprite_delta[1][i] <<= shift_y;
367  ctx->sprite_shift[i] = 16;
368  }
370  }
371 
372  return 0;
373 }
374 
380 {
381  MpegEncContext *s = &ctx->m;
382 
383  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
384  int header_extension = 0, mb_num, len;
385 
386  /* is there enough space left for a video packet + header */
387  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
388  return -1;
389 
390  for (len = 0; len < 32; len++)
391  if (get_bits1(&s->gb))
392  break;
393 
395  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
396  return -1;
397  }
398 
399  if (ctx->shape != RECT_SHAPE) {
400  header_extension = get_bits1(&s->gb);
401  // FIXME more stuff here
402  }
403 
404  mb_num = get_bits(&s->gb, mb_num_bits);
405  if (mb_num >= s->mb_num) {
407  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
408  return -1;
409  }
410  if (s->pict_type == AV_PICTURE_TYPE_B) {
411  int mb_x = 0, mb_y = 0;
412 
413  while (s->next_picture.mbskip_table[s->mb_index2xy[mb_num]]) {
414  if (!mb_x)
416  mb_num++;
417  if (++mb_x == s->mb_width)
418  mb_x = 0;
419  }
420  if (mb_num >= s->mb_num)
421  return -1; // slice contains just skipped MBs (already decoded)
422  }
423 
424  s->mb_x = mb_num % s->mb_width;
425  s->mb_y = mb_num / s->mb_width;
426 
427  if (ctx->shape != BIN_ONLY_SHAPE) {
428  int qscale = get_bits(&s->gb, s->quant_precision);
429  if (qscale)
430  s->chroma_qscale = s->qscale = qscale;
431  }
432 
433  if (ctx->shape == RECT_SHAPE)
434  header_extension = get_bits1(&s->gb);
435 
436  if (header_extension) {
437  int time_incr = 0;
438 
439  while (get_bits1(&s->gb) != 0)
440  time_incr++;
441 
442  check_marker(&s->gb, "before time_increment in video packed header");
443  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
444  check_marker(&s->gb, "before vop_coding_type in video packed header");
445 
446  skip_bits(&s->gb, 2); /* vop coding type */
447  // FIXME not rect stuff here
448 
449  if (ctx->shape != BIN_ONLY_SHAPE) {
450  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
451  // FIXME don't just ignore everything
452  if (s->pict_type == AV_PICTURE_TYPE_S &&
453  ctx->vol_sprite_usage == GMC_SPRITE) {
454  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
455  return AVERROR_INVALIDDATA;
456  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
457  }
458 
459  // FIXME reduced res stuff here
460 
461  if (s->pict_type != AV_PICTURE_TYPE_I) {
462  int f_code = get_bits(&s->gb, 3); /* fcode_for */
463  if (f_code == 0)
465  "Error, video packet header damaged (f_code=0)\n");
466  }
467  if (s->pict_type == AV_PICTURE_TYPE_B) {
468  int b_code = get_bits(&s->gb, 3);
469  if (b_code == 0)
471  "Error, video packet header damaged (b_code=0)\n");
472  }
473  }
474  }
475  // FIXME new-pred stuff
476 
477  return 0;
478 }
479 
485 static inline int get_amv(Mpeg4DecContext *ctx, int n)
486 {
487  MpegEncContext *s = &ctx->m;
488  int x, y, mb_v, sum, dx, dy, shift;
489  int len = 1 << (s->f_code + 4);
490  const int a = s->sprite_warping_accuracy;
491 
492  if (s->workaround_bugs & FF_BUG_AMV)
493  len >>= s->quarter_sample;
494 
495  if (s->real_sprite_warping_points == 1) {
496  if (ctx->divx_version == 500 && ctx->divx_build == 413)
497  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
498  else
499  sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
500  } else {
501  dx = s->sprite_delta[n][0];
502  dy = s->sprite_delta[n][1];
503  shift = ctx->sprite_shift[0];
504  if (n)
505  dy -= 1 << (shift + a + 1);
506  else
507  dx -= 1 << (shift + a + 1);
508  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
509 
510  sum = 0;
511  for (y = 0; y < 16; y++) {
512  int v;
513 
514  v = mb_v + dy * y;
515  // FIXME optimize
516  for (x = 0; x < 16; x++) {
517  sum += v >> shift;
518  v += dx;
519  }
520  }
521  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
522  }
523 
524  if (sum < -len)
525  sum = -len;
526  else if (sum >= len)
527  sum = len - 1;
528 
529  return sum;
530 }
531 
538 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
539 {
540  int level, code;
541 
542  if (n < 4)
543  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
544  else
545  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
546 
547  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
548  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
549  return -1;
550  }
551 
552  if (code == 0) {
553  level = 0;
554  } else {
555  if (IS_3IV1) {
556  if (code == 1)
557  level = 2 * get_bits1(&s->gb) - 1;
558  else {
559  if (get_bits1(&s->gb))
560  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
561  else
562  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
563  }
564  } else {
565  level = get_xbits(&s->gb, code);
566  }
567 
568  if (code > 8) {
569  if (get_bits1(&s->gb) == 0) { /* marker */
570  if (s->err_recognition & AV_EF_BITSTREAM) {
571  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
572  return -1;
573  }
574  }
575  }
576  }
577 
578  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
579 }
580 
586 {
587  MpegEncContext *s = &ctx->m;
588  int mb_num = 0;
589  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
590 
591  /* decode first partition */
592  s->first_slice_line = 1;
593  for (; s->mb_y < s->mb_height; s->mb_y++) {
595  for (; s->mb_x < s->mb_width; s->mb_x++) {
596  const int xy = s->mb_x + s->mb_y * s->mb_stride;
597  int cbpc;
598  int dir = 0;
599 
600  mb_num++;
602  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
603  s->first_slice_line = 0;
604 
605  if (s->pict_type == AV_PICTURE_TYPE_I) {
606  int i;
607 
608  do {
609  if (show_bits_long(&s->gb, 19) == DC_MARKER)
610  return mb_num - 1;
611 
613  if (cbpc < 0) {
615  "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
616  return -1;
617  }
618  } while (cbpc == 8);
619 
620  s->cbp_table[xy] = cbpc & 3;
622  s->mb_intra = 1;
623 
624  if (cbpc & 4)
625  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
626 
627  s->current_picture.qscale_table[xy] = s->qscale;
628 
629  s->mbintra_table[xy] = 1;
630  for (i = 0; i < 6; i++) {
631  int dc_pred_dir;
632  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
633  if (dc < 0) {
635  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
636  return -1;
637  }
638  dir <<= 1;
639  if (dc_pred_dir)
640  dir |= 1;
641  }
642  s->pred_dir_table[xy] = dir;
643  } else { /* P/S_TYPE */
644  int mx, my, pred_x, pred_y, bits;
645  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
646  const int stride = s->b8_stride * 2;
647 
648 try_again:
649  bits = show_bits(&s->gb, 17);
650  if (bits == MOTION_MARKER)
651  return mb_num - 1;
652 
653  skip_bits1(&s->gb);
654  if (bits & 0x10000) {
655  /* skip mb */
656  if (s->pict_type == AV_PICTURE_TYPE_S &&
657  ctx->vol_sprite_usage == GMC_SPRITE) {
659  MB_TYPE_16x16 |
660  MB_TYPE_GMC |
661  MB_TYPE_L0;
662  mx = get_amv(ctx, 0);
663  my = get_amv(ctx, 1);
664  } else {
666  MB_TYPE_16x16 |
667  MB_TYPE_L0;
668  mx = my = 0;
669  }
670  mot_val[0] =
671  mot_val[2] =
672  mot_val[0 + stride] =
673  mot_val[2 + stride] = mx;
674  mot_val[1] =
675  mot_val[3] =
676  mot_val[1 + stride] =
677  mot_val[3 + stride] = my;
678 
679  if (s->mbintra_table[xy])
681  continue;
682  }
683 
685  if (cbpc < 0) {
687  "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
688  return -1;
689  }
690  if (cbpc == 20)
691  goto try_again;
692 
693  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
694 
695  s->mb_intra = ((cbpc & 4) != 0);
696 
697  if (s->mb_intra) {
699  s->mbintra_table[xy] = 1;
700  mot_val[0] =
701  mot_val[2] =
702  mot_val[0 + stride] =
703  mot_val[2 + stride] = 0;
704  mot_val[1] =
705  mot_val[3] =
706  mot_val[1 + stride] =
707  mot_val[3 + stride] = 0;
708  } else {
709  if (s->mbintra_table[xy])
711 
712  if (s->pict_type == AV_PICTURE_TYPE_S &&
713  ctx->vol_sprite_usage == GMC_SPRITE &&
714  (cbpc & 16) == 0)
715  s->mcsel = get_bits1(&s->gb);
716  else
717  s->mcsel = 0;
718 
719  if ((cbpc & 16) == 0) {
720  /* 16x16 motion prediction */
721 
722  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
723  if (!s->mcsel) {
724  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
725  if (mx >= 0xffff)
726  return -1;
727 
728  my = ff_h263_decode_motion(s, pred_y, s->f_code);
729  if (my >= 0xffff)
730  return -1;
732  MB_TYPE_L0;
733  } else {
734  mx = get_amv(ctx, 0);
735  my = get_amv(ctx, 1);
737  MB_TYPE_GMC |
738  MB_TYPE_L0;
739  }
740 
741  mot_val[0] =
742  mot_val[2] =
743  mot_val[0 + stride] =
744  mot_val[2 + stride] = mx;
745  mot_val[1] =
746  mot_val[3] =
747  mot_val[1 + stride] =
748  mot_val[3 + stride] = my;
749  } else {
750  int i;
752  MB_TYPE_L0;
753  for (i = 0; i < 4; i++) {
754  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
755  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
756  if (mx >= 0xffff)
757  return -1;
758 
759  my = ff_h263_decode_motion(s, pred_y, s->f_code);
760  if (my >= 0xffff)
761  return -1;
762  mot_val[0] = mx;
763  mot_val[1] = my;
764  }
765  }
766  }
767  }
768  }
769  s->mb_x = 0;
770  }
771 
772  return mb_num;
773 }
774 
779 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
780 {
781  int mb_num = 0;
782  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
783 
784  s->mb_x = s->resync_mb_x;
785  s->first_slice_line = 1;
786  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
788  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
789  const int xy = s->mb_x + s->mb_y * s->mb_stride;
790 
791  mb_num++;
793  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
794  s->first_slice_line = 0;
795 
796  if (s->pict_type == AV_PICTURE_TYPE_I) {
797  int ac_pred = get_bits1(&s->gb);
798  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
799  if (cbpy < 0) {
801  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
802  return -1;
803  }
804 
805  s->cbp_table[xy] |= cbpy << 2;
806  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
807  } else { /* P || S_TYPE */
808  if (IS_INTRA(s->current_picture.mb_type[xy])) {
809  int i;
810  int dir = 0;
811  int ac_pred = get_bits1(&s->gb);
812  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
813 
814  if (cbpy < 0) {
816  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
817  return -1;
818  }
819 
820  if (s->cbp_table[xy] & 8)
821  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
822  s->current_picture.qscale_table[xy] = s->qscale;
823 
824  for (i = 0; i < 6; i++) {
825  int dc_pred_dir;
826  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
827  if (dc < 0) {
829  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
830  return -1;
831  }
832  dir <<= 1;
833  if (dc_pred_dir)
834  dir |= 1;
835  }
836  s->cbp_table[xy] &= 3; // remove dquant
837  s->cbp_table[xy] |= cbpy << 2;
838  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
839  s->pred_dir_table[xy] = dir;
840  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
841  s->current_picture.qscale_table[xy] = s->qscale;
842  s->cbp_table[xy] = 0;
843  } else {
844  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
845 
846  if (cbpy < 0) {
848  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
849  return -1;
850  }
851 
852  if (s->cbp_table[xy] & 8)
853  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
854  s->current_picture.qscale_table[xy] = s->qscale;
855 
856  s->cbp_table[xy] &= 3; // remove dquant
857  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
858  }
859  }
860  }
861  if (mb_num >= mb_count)
862  return 0;
863  s->mb_x = 0;
864  }
865  return 0;
866 }
867 
873 {
874  MpegEncContext *s = &ctx->m;
875  int mb_num;
876  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
877  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
878 
879  mb_num = mpeg4_decode_partition_a(ctx);
880  if (mb_num < 0) {
882  s->mb_x, s->mb_y, part_a_error);
883  return -1;
884  }
885 
886  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
887  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
889  s->mb_x, s->mb_y, part_a_error);
890  return -1;
891  }
892 
893  s->mb_num_left = mb_num;
894 
895  if (s->pict_type == AV_PICTURE_TYPE_I) {
896  while (show_bits(&s->gb, 9) == 1)
897  skip_bits(&s->gb, 9);
898  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
900  "marker missing after first I partition at %d %d\n",
901  s->mb_x, s->mb_y);
902  return -1;
903  }
904  } else {
905  while (show_bits(&s->gb, 10) == 1)
906  skip_bits(&s->gb, 10);
907  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
909  "marker missing after first P partition at %d %d\n",
910  s->mb_x, s->mb_y);
911  return -1;
912  }
913  }
915  s->mb_x - 1, s->mb_y, part_a_end);
916 
917  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
918  if (s->pict_type == AV_PICTURE_TYPE_P)
920  s->mb_x, s->mb_y, ER_DC_ERROR);
921  return -1;
922  } else {
923  if (s->pict_type == AV_PICTURE_TYPE_P)
925  s->mb_x - 1, s->mb_y, ER_DC_END);
926  }
927 
928  return 0;
929 }
930 
935 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
936  int n, int coded, int intra, int rvlc)
937 {
938  MpegEncContext *s = &ctx->m;
939  int level, i, last, run, qmul, qadd, dc_pred_dir;
940  RLTable *rl;
941  RL_VLC_ELEM *rl_vlc;
942  const uint8_t *scan_table;
943 
944  // Note intra & rvlc should be optimized away if this is inlined
945 
946  if (intra) {
947  if (ctx->use_intra_dc_vlc) {
948  /* DC coef */
949  if (s->partitioned_frame) {
950  level = s->dc_val[0][s->block_index[n]];
951  if (n < 4)
952  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
953  else
954  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
955  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
956  } else {
957  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
958  if (level < 0)
959  return -1;
960  }
961  block[0] = level;
962  i = 0;
963  } else {
964  i = -1;
965  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
966  }
967  if (!coded)
968  goto not_coded;
969 
970  if (rvlc) {
971  rl = &ff_rvlc_rl_intra;
972  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
973  } else {
974  rl = &ff_mpeg4_rl_intra;
975  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
976  }
977  if (s->ac_pred) {
978  if (dc_pred_dir == 0)
979  scan_table = s->intra_v_scantable.permutated; /* left */
980  else
981  scan_table = s->intra_h_scantable.permutated; /* top */
982  } else {
983  scan_table = s->intra_scantable.permutated;
984  }
985  qmul = 1;
986  qadd = 0;
987  } else {
988  i = -1;
989  if (!coded) {
990  s->block_last_index[n] = i;
991  return 0;
992  }
993  if (rvlc)
994  rl = &ff_rvlc_rl_inter;
995  else
996  rl = &ff_h263_rl_inter;
997 
998  scan_table = s->intra_scantable.permutated;
999 
1000  if (s->mpeg_quant) {
1001  qmul = 1;
1002  qadd = 0;
1003  if (rvlc)
1004  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1005  else
1006  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1007  } else {
1008  qmul = s->qscale << 1;
1009  qadd = (s->qscale - 1) | 1;
1010  if (rvlc)
1011  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1012  else
1013  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1014  }
1015  }
1016  {
1017  OPEN_READER(re, &s->gb);
1018  for (;;) {
1019  UPDATE_CACHE(re, &s->gb);
1020  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1021  if (level == 0) {
1022  /* escape */
1023  if (rvlc) {
1024  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1026  "1. marker bit missing in rvlc esc\n");
1027  return -1;
1028  }
1029  SKIP_CACHE(re, &s->gb, 1);
1030 
1031  last = SHOW_UBITS(re, &s->gb, 1);
1032  SKIP_CACHE(re, &s->gb, 1);
1033  run = SHOW_UBITS(re, &s->gb, 6);
1034  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1035  UPDATE_CACHE(re, &s->gb);
1036 
1037  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1039  "2. marker bit missing in rvlc esc\n");
1040  return -1;
1041  }
1042  SKIP_CACHE(re, &s->gb, 1);
1043 
1044  level = SHOW_UBITS(re, &s->gb, 11);
1045  SKIP_CACHE(re, &s->gb, 11);
1046 
1047  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1048  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1049  return -1;
1050  }
1051  SKIP_CACHE(re, &s->gb, 5);
1052 
1053  level = level * qmul + qadd;
1054  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1055  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1056 
1057  i += run + 1;
1058  if (last)
1059  i += 192;
1060  } else {
1061  int cache;
1062  cache = GET_CACHE(re, &s->gb);
1063 
1064  if (IS_3IV1)
1065  cache ^= 0xC0000000;
1066 
1067  if (cache & 0x80000000) {
1068  if (cache & 0x40000000) {
1069  /* third escape */
1070  SKIP_CACHE(re, &s->gb, 2);
1071  last = SHOW_UBITS(re, &s->gb, 1);
1072  SKIP_CACHE(re, &s->gb, 1);
1073  run = SHOW_UBITS(re, &s->gb, 6);
1074  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1075  UPDATE_CACHE(re, &s->gb);
1076 
1077  if (IS_3IV1) {
1078  level = SHOW_SBITS(re, &s->gb, 12);
1079  LAST_SKIP_BITS(re, &s->gb, 12);
1080  } else {
1081  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1083  "1. marker bit missing in 3. esc\n");
1084  return -1;
1085  }
1086  SKIP_CACHE(re, &s->gb, 1);
1087 
1088  level = SHOW_SBITS(re, &s->gb, 12);
1089  SKIP_CACHE(re, &s->gb, 12);
1090 
1091  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1093  "2. marker bit missing in 3. esc\n");
1094  return -1;
1095  }
1096 
1097  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1098  }
1099 
1100  if (level > 0)
1101  level = level * qmul + qadd;
1102  else
1103  level = level * qmul - qadd;
1104 
1105  if ((unsigned)(level + 2048) > 4095) {
1106  if (s->err_recognition & AV_EF_BITSTREAM) {
1107  if (level > 2560 || level < -2560) {
1109  "|level| overflow in 3. esc, qp=%d\n",
1110  s->qscale);
1111  return -1;
1112  }
1113  }
1114  level = level < 0 ? -2048 : 2047;
1115  }
1116 
1117  i += run + 1;
1118  if (last)
1119  i += 192;
1120  } else {
1121  /* second escape */
1122  SKIP_BITS(re, &s->gb, 2);
1123  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1124  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1125  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1126  LAST_SKIP_BITS(re, &s->gb, 1);
1127  }
1128  } else {
1129  /* first escape */
1130  SKIP_BITS(re, &s->gb, 1);
1131  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1132  i += run;
1133  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1134  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1135  LAST_SKIP_BITS(re, &s->gb, 1);
1136  }
1137  }
1138  } else {
1139  i += run;
1140  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1141  LAST_SKIP_BITS(re, &s->gb, 1);
1142  }
1143  if (i > 62) {
1144  i -= 192;
1145  if (i & (~63)) {
1147  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1148  return -1;
1149  }
1150 
1151  block[scan_table[i]] = level;
1152  break;
1153  }
1154 
1155  block[scan_table[i]] = level;
1156  }
1157  CLOSE_READER(re, &s->gb);
1158  }
1159 
1160 not_coded:
1161  if (intra) {
1162  if (!ctx->use_intra_dc_vlc) {
1163  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1164 
1165  i -= i >> 31; // if (i == -1) i = 0;
1166  }
1167 
1168  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1169  if (s->ac_pred)
1170  i = 63; // FIXME not optimal
1171  }
1172  s->block_last_index[n] = i;
1173  return 0;
1174 }
1175 
1180 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1181 {
1182  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1183  int cbp, mb_type;
1184  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1185 
1186  mb_type = s->current_picture.mb_type[xy];
1187  cbp = s->cbp_table[xy];
1188 
1189  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1190 
1191  if (s->current_picture.qscale_table[xy] != s->qscale)
1193 
1194  if (s->pict_type == AV_PICTURE_TYPE_P ||
1195  s->pict_type == AV_PICTURE_TYPE_S) {
1196  int i;
1197  for (i = 0; i < 4; i++) {
1198  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1199  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1200  }
1201  s->mb_intra = IS_INTRA(mb_type);
1202 
1203  if (IS_SKIP(mb_type)) {
1204  /* skip mb */
1205  for (i = 0; i < 6; i++)
1206  s->block_last_index[i] = -1;
1207  s->mv_dir = MV_DIR_FORWARD;
1208  s->mv_type = MV_TYPE_16X16;
1210  && ctx->vol_sprite_usage == GMC_SPRITE) {
1211  s->mcsel = 1;
1212  s->mb_skipped = 0;
1213  } else {
1214  s->mcsel = 0;
1215  s->mb_skipped = 1;
1216  }
1217  } else if (s->mb_intra) {
1219  } else if (!s->mb_intra) {
1220  // s->mcsel = 0; // FIXME do we need to init that?
1221 
1222  s->mv_dir = MV_DIR_FORWARD;
1223  if (IS_8X8(mb_type)) {
1224  s->mv_type = MV_TYPE_8X8;
1225  } else {
1226  s->mv_type = MV_TYPE_16X16;
1227  }
1228  }
1229  } else { /* I-Frame */
1230  s->mb_intra = 1;
1232  }
1233 
1234  if (!IS_SKIP(mb_type)) {
1235  int i;
1236  s->bdsp.clear_blocks(s->block[0]);
1237  /* decode each block */
1238  for (i = 0; i < 6; i++) {
1239  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1241  "texture corrupted at %d %d %d\n",
1242  s->mb_x, s->mb_y, s->mb_intra);
1243  return -1;
1244  }
1245  cbp += cbp;
1246  }
1247  }
1248 
1249  /* per-MB end of slice check */
1250  if (--s->mb_num_left <= 0) {
1251  if (mpeg4_is_resync(s))
1252  return SLICE_END;
1253  else
1254  return SLICE_NOEND;
1255  } else {
1256  if (mpeg4_is_resync(s)) {
1257  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1258  if (s->cbp_table[xy + delta])
1259  return SLICE_END;
1260  }
1261  return SLICE_OK;
1262  }
1263 }
1264 
1265 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1266 {
1267  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1268  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1269  int16_t *mot_val;
1270  static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1271  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1272 
1273  assert(s->h263_pred);
1274 
1275  if (s->pict_type == AV_PICTURE_TYPE_P ||
1276  s->pict_type == AV_PICTURE_TYPE_S) {
1277  do {
1278  if (get_bits1(&s->gb)) {
1279  /* skip mb */
1280  s->mb_intra = 0;
1281  for (i = 0; i < 6; i++)
1282  s->block_last_index[i] = -1;
1283  s->mv_dir = MV_DIR_FORWARD;
1284  s->mv_type = MV_TYPE_16X16;
1285  if (s->pict_type == AV_PICTURE_TYPE_S &&
1286  ctx->vol_sprite_usage == GMC_SPRITE) {
1288  MB_TYPE_GMC |
1289  MB_TYPE_16x16 |
1290  MB_TYPE_L0;
1291  s->mcsel = 1;
1292  s->mv[0][0][0] = get_amv(ctx, 0);
1293  s->mv[0][0][1] = get_amv(ctx, 1);
1294  s->mb_skipped = 0;
1295  } else {
1297  MB_TYPE_16x16 |
1298  MB_TYPE_L0;
1299  s->mcsel = 0;
1300  s->mv[0][0][0] = 0;
1301  s->mv[0][0][1] = 0;
1302  s->mb_skipped = 1;
1303  }
1304  goto end;
1305  }
1307  if (cbpc < 0) {
1309  "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1310  return -1;
1311  }
1312  } while (cbpc == 20);
1313 
1314  s->bdsp.clear_blocks(s->block[0]);
1315  dquant = cbpc & 8;
1316  s->mb_intra = ((cbpc & 4) != 0);
1317  if (s->mb_intra)
1318  goto intra;
1319 
1320  if (s->pict_type == AV_PICTURE_TYPE_S &&
1321  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1322  s->mcsel = get_bits1(&s->gb);
1323  else
1324  s->mcsel = 0;
1325  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1326 
1327  cbp = (cbpc & 3) | (cbpy << 2);
1328  if (dquant)
1329  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1330  if ((!s->progressive_sequence) &&
1331  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1332  s->interlaced_dct = get_bits1(&s->gb);
1333 
1334  s->mv_dir = MV_DIR_FORWARD;
1335  if ((cbpc & 16) == 0) {
1336  if (s->mcsel) {
1338  MB_TYPE_16x16 |
1339  MB_TYPE_L0;
1340  /* 16x16 global motion prediction */
1341  s->mv_type = MV_TYPE_16X16;
1342  mx = get_amv(ctx, 0);
1343  my = get_amv(ctx, 1);
1344  s->mv[0][0][0] = mx;
1345  s->mv[0][0][1] = my;
1346  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1348  MB_TYPE_L0 |
1350  /* 16x8 field motion prediction */
1351  s->mv_type = MV_TYPE_FIELD;
1352 
1353  s->field_select[0][0] = get_bits1(&s->gb);
1354  s->field_select[0][1] = get_bits1(&s->gb);
1355 
1356  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1357 
1358  for (i = 0; i < 2; i++) {
1359  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1360  if (mx >= 0xffff)
1361  return -1;
1362 
1363  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1364  if (my >= 0xffff)
1365  return -1;
1366 
1367  s->mv[0][i][0] = mx;
1368  s->mv[0][i][1] = my;
1369  }
1370  } else {
1372  /* 16x16 motion prediction */
1373  s->mv_type = MV_TYPE_16X16;
1374  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1375  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1376 
1377  if (mx >= 0xffff)
1378  return -1;
1379 
1380  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1381 
1382  if (my >= 0xffff)
1383  return -1;
1384  s->mv[0][0][0] = mx;
1385  s->mv[0][0][1] = my;
1386  }
1387  } else {
1389  s->mv_type = MV_TYPE_8X8;
1390  for (i = 0; i < 4; i++) {
1391  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1392  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1393  if (mx >= 0xffff)
1394  return -1;
1395 
1396  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1397  if (my >= 0xffff)
1398  return -1;
1399  s->mv[0][i][0] = mx;
1400  s->mv[0][i][1] = my;
1401  mot_val[0] = mx;
1402  mot_val[1] = my;
1403  }
1404  }
1405  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1406  int modb1; // first bit of modb
1407  int modb2; // second bit of modb
1408  int mb_type;
1409 
1410  s->mb_intra = 0; // B-frames never contain intra blocks
1411  s->mcsel = 0; // ... true gmc blocks
1412 
1413  if (s->mb_x == 0) {
1414  for (i = 0; i < 2; i++) {
1415  s->last_mv[i][0][0] =
1416  s->last_mv[i][0][1] =
1417  s->last_mv[i][1][0] =
1418  s->last_mv[i][1][1] = 0;
1419  }
1420 
1422  }
1423 
1424  /* if we skipped it in the future P Frame than skip it now too */
1425  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1426 
1427  if (s->mb_skipped) {
1428  /* skip mb */
1429  for (i = 0; i < 6; i++)
1430  s->block_last_index[i] = -1;
1431 
1432  s->mv_dir = MV_DIR_FORWARD;
1433  s->mv_type = MV_TYPE_16X16;
1434  s->mv[0][0][0] =
1435  s->mv[0][0][1] =
1436  s->mv[1][0][0] =
1437  s->mv[1][0][1] = 0;
1439  MB_TYPE_16x16 |
1440  MB_TYPE_L0;
1441  goto end;
1442  }
1443 
1444  modb1 = get_bits1(&s->gb);
1445  if (modb1) {
1446  // like MB_TYPE_B_DIRECT but no vectors coded
1448  cbp = 0;
1449  } else {
1450  modb2 = get_bits1(&s->gb);
1451  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1452  if (mb_type < 0) {
1453  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1454  return -1;
1455  }
1456  mb_type = mb_type_b_map[mb_type];
1457  if (modb2) {
1458  cbp = 0;
1459  } else {
1460  s->bdsp.clear_blocks(s->block[0]);
1461  cbp = get_bits(&s->gb, 6);
1462  }
1463 
1464  if ((!IS_DIRECT(mb_type)) && cbp) {
1465  if (get_bits1(&s->gb))
1466  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1467  }
1468 
1469  if (!s->progressive_sequence) {
1470  if (cbp)
1471  s->interlaced_dct = get_bits1(&s->gb);
1472 
1473  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1474  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1475  mb_type &= ~MB_TYPE_16x16;
1476 
1477  if (USES_LIST(mb_type, 0)) {
1478  s->field_select[0][0] = get_bits1(&s->gb);
1479  s->field_select[0][1] = get_bits1(&s->gb);
1480  }
1481  if (USES_LIST(mb_type, 1)) {
1482  s->field_select[1][0] = get_bits1(&s->gb);
1483  s->field_select[1][1] = get_bits1(&s->gb);
1484  }
1485  }
1486  }
1487 
1488  s->mv_dir = 0;
1489  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1490  s->mv_type = MV_TYPE_16X16;
1491 
1492  if (USES_LIST(mb_type, 0)) {
1493  s->mv_dir = MV_DIR_FORWARD;
1494 
1495  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1496  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1497  s->last_mv[0][1][0] =
1498  s->last_mv[0][0][0] =
1499  s->mv[0][0][0] = mx;
1500  s->last_mv[0][1][1] =
1501  s->last_mv[0][0][1] =
1502  s->mv[0][0][1] = my;
1503  }
1504 
1505  if (USES_LIST(mb_type, 1)) {
1506  s->mv_dir |= MV_DIR_BACKWARD;
1507 
1508  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1509  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1510  s->last_mv[1][1][0] =
1511  s->last_mv[1][0][0] =
1512  s->mv[1][0][0] = mx;
1513  s->last_mv[1][1][1] =
1514  s->last_mv[1][0][1] =
1515  s->mv[1][0][1] = my;
1516  }
1517  } else if (!IS_DIRECT(mb_type)) {
1518  s->mv_type = MV_TYPE_FIELD;
1519 
1520  if (USES_LIST(mb_type, 0)) {
1521  s->mv_dir = MV_DIR_FORWARD;
1522 
1523  for (i = 0; i < 2; i++) {
1524  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1525  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1526  s->last_mv[0][i][0] =
1527  s->mv[0][i][0] = mx;
1528  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1529  }
1530  }
1531 
1532  if (USES_LIST(mb_type, 1)) {
1533  s->mv_dir |= MV_DIR_BACKWARD;
1534 
1535  for (i = 0; i < 2; i++) {
1536  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1537  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1538  s->last_mv[1][i][0] =
1539  s->mv[1][i][0] = mx;
1540  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1541  }
1542  }
1543  }
1544  }
1545 
1546  if (IS_DIRECT(mb_type)) {
1547  if (IS_SKIP(mb_type)) {
1548  mx =
1549  my = 0;
1550  } else {
1551  mx = ff_h263_decode_motion(s, 0, 1);
1552  my = ff_h263_decode_motion(s, 0, 1);
1553  }
1554 
1556  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1557  }
1558  s->current_picture.mb_type[xy] = mb_type;
1559  } else { /* I-Frame */
1560  do {
1562  if (cbpc < 0) {
1564  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1565  return -1;
1566  }
1567  } while (cbpc == 8);
1568 
1569  dquant = cbpc & 4;
1570  s->mb_intra = 1;
1571 
1572 intra:
1573  s->ac_pred = get_bits1(&s->gb);
1574  if (s->ac_pred)
1576  else
1578 
1579  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1580  if (cbpy < 0) {
1582  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1583  return -1;
1584  }
1585  cbp = (cbpc & 3) | (cbpy << 2);
1586 
1587  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1588 
1589  if (dquant)
1590  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1591 
1592  if (!s->progressive_sequence)
1593  s->interlaced_dct = get_bits1(&s->gb);
1594 
1595  s->bdsp.clear_blocks(s->block[0]);
1596  /* decode each block */
1597  for (i = 0; i < 6; i++) {
1598  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1599  return -1;
1600  cbp += cbp;
1601  }
1602  goto end;
1603  }
1604 
1605  /* decode each block */
1606  for (i = 0; i < 6; i++) {
1607  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1608  return -1;
1609  cbp += cbp;
1610  }
1611 
1612 end:
1613  /* per-MB end of slice check */
1614  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1615  if (mpeg4_is_resync(s)) {
1616  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1617 
1618  if (s->pict_type == AV_PICTURE_TYPE_B &&
1619  s->next_picture.mbskip_table[xy + delta]) {
1621  (s->mb_x + delta >= s->mb_width)
1622  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1623  : s->mb_y, 0);
1624  }
1625 
1626  if (s->pict_type == AV_PICTURE_TYPE_B &&
1627  s->next_picture.mbskip_table[xy + delta])
1628  return SLICE_OK;
1629  return SLICE_END;
1630  }
1631  }
1632 
1633  return SLICE_OK;
1634 }
1635 
1637 {
1638  int hours, minutes, seconds;
1639  unsigned time_code = show_bits(gb, 18);
1640 
1641  if (time_code & 0x40) { /* marker_bit */
1642  hours = time_code >> 13;
1643  minutes = time_code >> 7 & 0x3f;
1644  seconds = time_code & 0x3f;
1645  s->time_base = seconds + 60 * (minutes + 60 * hours);
1646  skip_bits(gb, 20); /* time_code, closed_gov, broken_link */
1647  } else {
1648  av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n");
1649  }
1650 
1651  return 0;
1652 }
1653 
1655 {
1656  int profile_and_level_indication;
1657 
1658  profile_and_level_indication = get_bits(gb, 8);
1659 
1660  s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4;
1661  s->avctx->level = (profile_and_level_indication & 0x0f);
1662 
1663  // for Simple profile, level 0
1664  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1665  s->avctx->level = 0;
1666  }
1667 
1668  return 0;
1669 }
1670 
1672 {
1673  MpegEncContext *s = &ctx->m;
1674  int width, height, vo_ver_id;
1675 
1676  /* vol header */
1677  skip_bits(gb, 1); /* random access */
1678  s->vo_type = get_bits(gb, 8);
1679  if (get_bits1(gb) != 0) { /* is_ol_id */
1680  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1681  skip_bits(gb, 3); /* vo_priority */
1682  } else {
1683  vo_ver_id = 1;
1684  }
1685  s->aspect_ratio_info = get_bits(gb, 4);
1687  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1688  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1689  } else {
1691  }
1692 
1693  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1694  int chroma_format = get_bits(gb, 2);
1695  if (chroma_format != CHROMA_420)
1696  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1697 
1698  s->low_delay = get_bits1(gb);
1699  if (get_bits1(gb)) { /* vbv parameters */
1700  get_bits(gb, 15); /* first_half_bitrate */
1701  skip_bits1(gb); /* marker */
1702  get_bits(gb, 15); /* latter_half_bitrate */
1703  skip_bits1(gb); /* marker */
1704  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1705  skip_bits1(gb); /* marker */
1706  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1707  get_bits(gb, 11); /* first_half_vbv_occupancy */
1708  skip_bits1(gb); /* marker */
1709  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1710  skip_bits1(gb); /* marker */
1711  }
1712  } else {
1713  /* is setting low delay flag only once the smartest thing to do?
1714  * low delay detection won't be overriden. */
1715  if (s->picture_number == 0)
1716  s->low_delay = 0;
1717  }
1718 
1719  ctx->shape = get_bits(gb, 2); /* vol shape */
1720  if (ctx->shape != RECT_SHAPE)
1721  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1722  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1723  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1724  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1725  }
1726 
1727  check_marker(gb, "before time_increment_resolution");
1728 
1729  s->avctx->time_base.den = get_bits(gb, 16);
1730  if (!s->avctx->time_base.den) {
1731  av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1732  s->avctx->time_base.num = 0;
1733  return -1;
1734  }
1735 
1736  ctx->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1737  if (ctx->time_increment_bits < 1)
1738  ctx->time_increment_bits = 1;
1739 
1740  check_marker(gb, "before fixed_vop_rate");
1741 
1742  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1744  else
1745  s->avctx->time_base.num = 1;
1746 
1747  ctx->t_frame = 0;
1748 
1749  if (ctx->shape != BIN_ONLY_SHAPE) {
1750  if (ctx->shape == RECT_SHAPE) {
1751  skip_bits1(gb); /* marker */
1752  width = get_bits(gb, 13);
1753  skip_bits1(gb); /* marker */
1754  height = get_bits(gb, 13);
1755  skip_bits1(gb); /* marker */
1756  if (width && height && /* they should be non zero but who knows */
1757  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1758  if (s->width && s->height &&
1759  (s->width != width || s->height != height))
1760  s->context_reinit = 1;
1761  s->width = width;
1762  s->height = height;
1763  }
1764  }
1765 
1767  s->progressive_frame = get_bits1(gb) ^ 1;
1768  s->interlaced_dct = 0;
1769  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1770  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1771  "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1772  if (vo_ver_id == 1)
1773  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1774  else
1775  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1776 
1777  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1778  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1779  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1780  ctx->vol_sprite_usage == GMC_SPRITE) {
1781  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1782  skip_bits(gb, 13); // sprite_width
1783  skip_bits1(gb); /* marker */
1784  skip_bits(gb, 13); // sprite_height
1785  skip_bits1(gb); /* marker */
1786  skip_bits(gb, 13); // sprite_left
1787  skip_bits1(gb); /* marker */
1788  skip_bits(gb, 13); // sprite_top
1789  skip_bits1(gb); /* marker */
1790  }
1791  ctx->num_sprite_warping_points = get_bits(gb, 6);
1792  if (ctx->num_sprite_warping_points > 3) {
1794  "%d sprite_warping_points\n",
1796  ctx->num_sprite_warping_points = 0;
1797  return -1;
1798  }
1799  s->sprite_warping_accuracy = get_bits(gb, 2);
1801  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1802  skip_bits1(gb); // low_latency_sprite
1803  }
1804  // FIXME sadct disable bit if verid!=1 && shape not rect
1805 
1806  if (get_bits1(gb) == 1) { /* not_8_bit */
1807  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1808  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1809  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1810  if (s->quant_precision != 5)
1812  "quant precision %d\n", s->quant_precision);
1813  } else {
1814  s->quant_precision = 5;
1815  }
1816 
1817  // FIXME a bunch of grayscale shape things
1818 
1819  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1820  int i, v;
1821 
1822  /* load default matrixes */
1823  for (i = 0; i < 64; i++) {
1824  int j = s->idsp.idct_permutation[i];
1826  s->intra_matrix[j] = v;
1827  s->chroma_intra_matrix[j] = v;
1828 
1830  s->inter_matrix[j] = v;
1831  s->chroma_inter_matrix[j] = v;
1832  }
1833 
1834  /* load custom intra matrix */
1835  if (get_bits1(gb)) {
1836  int last = 0;
1837  for (i = 0; i < 64; i++) {
1838  int j;
1839  v = get_bits(gb, 8);
1840  if (v == 0)
1841  break;
1842 
1843  last = v;
1845  s->intra_matrix[j] = last;
1846  s->chroma_intra_matrix[j] = last;
1847  }
1848 
1849  /* replicate last value */
1850  for (; i < 64; i++) {
1851  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1852  s->intra_matrix[j] = last;
1853  s->chroma_intra_matrix[j] = last;
1854  }
1855  }
1856 
1857  /* load custom non intra matrix */
1858  if (get_bits1(gb)) {
1859  int last = 0;
1860  for (i = 0; i < 64; i++) {
1861  int j;
1862  v = get_bits(gb, 8);
1863  if (v == 0)
1864  break;
1865 
1866  last = v;
1868  s->inter_matrix[j] = v;
1869  s->chroma_inter_matrix[j] = v;
1870  }
1871 
1872  /* replicate last value */
1873  for (; i < 64; i++) {
1874  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1875  s->inter_matrix[j] = last;
1876  s->chroma_inter_matrix[j] = last;
1877  }
1878  }
1879 
1880  // FIXME a bunch of grayscale shape things
1881  }
1882 
1883  if (vo_ver_id != 1)
1884  s->quarter_sample = get_bits1(gb);
1885  else
1886  s->quarter_sample = 0;
1887 
1888  if (!get_bits1(gb)) {
1889  int pos = get_bits_count(gb);
1890  int estimation_method = get_bits(gb, 2);
1891  if (estimation_method < 2) {
1892  if (!get_bits1(gb)) {
1893  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1894  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1895  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1896  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1897  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1898  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1899  }
1900  if (!get_bits1(gb)) {
1901  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1902  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1903  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1904  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1905  }
1906  if (!check_marker(gb, "in complexity estimation part 1")) {
1907  skip_bits_long(gb, pos - get_bits_count(gb));
1908  goto no_cplx_est;
1909  }
1910  if (!get_bits1(gb)) {
1911  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1912  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1913  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1914  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1915  }
1916  if (!get_bits1(gb)) {
1917  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1918  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1919  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1920  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1921  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1922  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1923  }
1924  if (!check_marker(gb, "in complexity estimation part 2")) {
1925  skip_bits_long(gb, pos - get_bits_count(gb));
1926  goto no_cplx_est;
1927  }
1928  if (estimation_method == 1) {
1929  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1930  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1931  }
1932  } else
1934  "Invalid Complexity estimation method %d\n",
1935  estimation_method);
1936  } else {
1937 
1938 no_cplx_est:
1941  ctx->cplx_estimation_trash_b = 0;
1942  }
1943 
1944  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1945 
1946  s->data_partitioning = get_bits1(gb);
1947  if (s->data_partitioning)
1948  ctx->rvlc = get_bits1(gb);
1949 
1950  if (vo_ver_id != 1) {
1951  ctx->new_pred = get_bits1(gb);
1952  if (ctx->new_pred) {
1953  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1954  skip_bits(gb, 2); /* requested upstream message type */
1955  skip_bits1(gb); /* newpred segment type */
1956  }
1957  if (get_bits1(gb)) // reduced_res_vop
1959  "reduced resolution VOP not supported\n");
1960  } else {
1961  ctx->new_pred = 0;
1962  }
1963 
1964  ctx->scalability = get_bits1(gb);
1965 
1966  if (ctx->scalability) {
1967  GetBitContext bak = *gb;
1968  int h_sampling_factor_n;
1969  int h_sampling_factor_m;
1970  int v_sampling_factor_n;
1971  int v_sampling_factor_m;
1972 
1973  skip_bits1(gb); // hierarchy_type
1974  skip_bits(gb, 4); /* ref_layer_id */
1975  skip_bits1(gb); /* ref_layer_sampling_dir */
1976  h_sampling_factor_n = get_bits(gb, 5);
1977  h_sampling_factor_m = get_bits(gb, 5);
1978  v_sampling_factor_n = get_bits(gb, 5);
1979  v_sampling_factor_m = get_bits(gb, 5);
1980  ctx->enhancement_type = get_bits1(gb);
1981 
1982  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
1983  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
1984  /* illegal scalability header (VERY broken encoder),
1985  * trying to workaround */
1986  ctx->scalability = 0;
1987  *gb = bak;
1988  } else
1989  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1990 
1991  // bin shape stuff FIXME
1992  }
1993  }
1994 
1995  return 0;
1996 }
1997 
2003 {
2004  MpegEncContext *s = &ctx->m;
2005  char buf[256];
2006  int i;
2007  int e;
2008  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2009  char last;
2010 
2011  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2012  if (show_bits(gb, 23) == 0)
2013  break;
2014  buf[i] = get_bits(gb, 8);
2015  }
2016  buf[i] = 0;
2017 
2018  /* divx detection */
2019  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2020  if (e < 2)
2021  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2022  if (e >= 2) {
2023  ctx->divx_version = ver;
2024  ctx->divx_build = build;
2025  s->divx_packed = e == 3 && last == 'p';
2026  if (s->divx_packed && !ctx->showed_packed_warning) {
2028  "Invalid and inefficient vfw-avi packed B frames detected\n");
2029  ctx->showed_packed_warning = 1;
2030  }
2031  }
2032 
2033  /* libavcodec detection */
2034  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2035  if (e != 4)
2036  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2037  if (e != 4) {
2038  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2039  if (e > 1)
2040  build = (ver << 16) + (ver2 << 8) + ver3;
2041  }
2042  if (e != 4) {
2043  if (strcmp(buf, "ffmpeg") == 0)
2044  ctx->lavc_build = 4600;
2045  }
2046  if (e == 4)
2047  ctx->lavc_build = build;
2048 
2049  /* Xvid detection */
2050  e = sscanf(buf, "XviD%d", &build);
2051  if (e == 1)
2052  ctx->xvid_build = build;
2053 
2054  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2055  if (s->stream_codec_tag == AV_RL32("XVID") ||
2056  s->codec_tag == AV_RL32("XVID") ||
2057  s->codec_tag == AV_RL32("XVIX") ||
2058  s->codec_tag == AV_RL32("RMP4") ||
2059  s->codec_tag == AV_RL32("ZMP4") ||
2060  s->codec_tag == AV_RL32("SIPP"))
2061  ctx->xvid_build = 0;
2062  }
2063 
2064  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2065  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2066  ctx->vol_control_parameters == 0)
2067  ctx->divx_version = 400; // divx 4
2068 
2069  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2070  ctx->divx_version =
2071  ctx->divx_build = -1;
2072  }
2073 
2074  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0)
2075  ff_xvididct_init(&s->idsp, s->avctx);
2076 
2077  return 0;
2078 }
2079 
2081 {
2082  MpegEncContext *s = &ctx->m;
2083  int time_incr, time_increment;
2084 
2085  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2086  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2087  ctx->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) {
2088  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
2089  s->low_delay = 0;
2090  }
2091 
2093  if (s->partitioned_frame)
2095  else
2097 
2098  time_incr = 0;
2099  while (get_bits1(gb) != 0)
2100  time_incr++;
2101 
2102  check_marker(gb, "before time_increment");
2103 
2104  if (ctx->time_increment_bits == 0 ||
2105  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2107  "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
2108 
2109  for (ctx->time_increment_bits = 1;
2110  ctx->time_increment_bits < 16;
2111  ctx->time_increment_bits++) {
2112  if (s->pict_type == AV_PICTURE_TYPE_P ||
2113  (s->pict_type == AV_PICTURE_TYPE_S &&
2114  ctx->vol_sprite_usage == GMC_SPRITE)) {
2115  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2116  break;
2117  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2118  break;
2119  }
2120 
2122  "my guess is %d bits ;)\n", ctx->time_increment_bits);
2123  }
2124 
2125  if (IS_3IV1)
2126  time_increment = get_bits1(gb); // FIXME investigate further
2127  else
2128  time_increment = get_bits(gb, ctx->time_increment_bits);
2129 
2130  if (s->pict_type != AV_PICTURE_TYPE_B) {
2131  s->last_time_base = s->time_base;
2132  s->time_base += time_incr;
2133  s->time = s->time_base * s->avctx->time_base.den + time_increment;
2134  if (s->workaround_bugs & FF_BUG_UMP4) {
2135  if (s->time < s->last_non_b_time) {
2136  /* header is not mpeg-4-compatible, broken encoder,
2137  * trying to workaround */
2138  s->time_base++;
2139  s->time += s->avctx->time_base.den;
2140  }
2141  }
2142  s->pp_time = s->time - s->last_non_b_time;
2143  s->last_non_b_time = s->time;
2144  } else {
2145  s->time = (s->last_time_base + time_incr) * s->avctx->time_base.den + time_increment;
2146  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2147  if (s->pp_time <= s->pb_time ||
2148  s->pp_time <= s->pp_time - s->pb_time ||
2149  s->pp_time <= 0) {
2150  /* messed up order, maybe after seeking? skipping current b-frame */
2151  return FRAME_SKIPPED;
2152  }
2154 
2155  if (ctx->t_frame == 0)
2156  ctx->t_frame = s->pb_time;
2157  if (ctx->t_frame == 0)
2158  ctx->t_frame = 1; // 1/0 protection
2160  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2161  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2162  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2163  if (!s->progressive_sequence) {
2164  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
2165  return FRAME_SKIPPED;
2166  }
2167  }
2168 
2169  check_marker(gb, "before vop_coded");
2170 
2171  /* vop coded */
2172  if (get_bits1(gb) != 1) {
2173  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2174  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2175  return FRAME_SKIPPED;
2176  }
2177  if (ctx->shape != BIN_ONLY_SHAPE &&
2178  (s->pict_type == AV_PICTURE_TYPE_P ||
2179  (s->pict_type == AV_PICTURE_TYPE_S &&
2180  ctx->vol_sprite_usage == GMC_SPRITE))) {
2181  /* rounding type for motion estimation */
2182  s->no_rounding = get_bits1(gb);
2183  } else {
2184  s->no_rounding = 0;
2185  }
2186  // FIXME reduced res stuff
2187 
2188  if (ctx->shape != RECT_SHAPE) {
2189  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2190  skip_bits(gb, 13); /* width */
2191  skip_bits1(gb); /* marker */
2192  skip_bits(gb, 13); /* height */
2193  skip_bits1(gb); /* marker */
2194  skip_bits(gb, 13); /* hor_spat_ref */
2195  skip_bits1(gb); /* marker */
2196  skip_bits(gb, 13); /* ver_spat_ref */
2197  }
2198  skip_bits1(gb); /* change_CR_disable */
2199 
2200  if (get_bits1(gb) != 0)
2201  skip_bits(gb, 8); /* constant_alpha_value */
2202  }
2203 
2204  // FIXME complexity estimation stuff
2205 
2206  if (ctx->shape != BIN_ONLY_SHAPE) {
2208  if (s->pict_type != AV_PICTURE_TYPE_I)
2210  if (s->pict_type == AV_PICTURE_TYPE_B)
2212 
2214  if (!s->progressive_sequence) {
2215  s->top_field_first = get_bits1(gb);
2216  s->alternate_scan = get_bits1(gb);
2217  } else
2218  s->alternate_scan = 0;
2219  }
2220 
2221  if (s->alternate_scan) {
2226  } else {
2231  }
2232 
2233  if (s->pict_type == AV_PICTURE_TYPE_S &&
2234  (ctx->vol_sprite_usage == STATIC_SPRITE ||
2235  ctx->vol_sprite_usage == GMC_SPRITE)) {
2236  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2237  return AVERROR_INVALIDDATA;
2238  if (ctx->sprite_brightness_change)
2240  "sprite_brightness_change not supported\n");
2241  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2242  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2243  }
2244 
2245  if (ctx->shape != BIN_ONLY_SHAPE) {
2246  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2247  if (s->qscale == 0) {
2249  "Error, header damaged or not MPEG4 header (qscale=0)\n");
2250  return -1; // makes no sense to continue, as there is nothing left from the image then
2251  }
2252 
2253  if (s->pict_type != AV_PICTURE_TYPE_I) {
2254  s->f_code = get_bits(gb, 3); /* fcode_for */
2255  if (s->f_code == 0) {
2257  "Error, header damaged or not MPEG4 header (f_code=0)\n");
2258  return -1; // makes no sense to continue, as there is nothing left from the image then
2259  }
2260  } else
2261  s->f_code = 1;
2262 
2263  if (s->pict_type == AV_PICTURE_TYPE_B) {
2264  s->b_code = get_bits(gb, 3);
2265  } else
2266  s->b_code = 1;
2267 
2268  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2270  "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",
2271  s->qscale, s->f_code, s->b_code,
2272  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")),
2274  s->top_field_first, s->quarter_sample ? "q" : "h",
2277  1 - s->no_rounding, s->vo_type,
2278  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2281  }
2282 
2283  if (!ctx->scalability) {
2284  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2285  skip_bits1(gb); // vop shape coding type
2286  } else {
2287  if (ctx->enhancement_type) {
2288  int load_backward_shape = get_bits1(gb);
2289  if (load_backward_shape)
2291  "load backward shape isn't supported\n");
2292  }
2293  skip_bits(gb, 2); // ref_select_code
2294  }
2295  }
2296  /* detect buggy encoders which don't set the low_delay flag
2297  * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2298  * easily (although it's buggy too) */
2299  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2300  ctx->divx_version == -1 && s->picture_number == 0) {
2302  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2303  s->low_delay = 1;
2304  }
2305 
2306  s->picture_number++; // better than pic number==0 always ;)
2307 
2308  // FIXME add short header support
2311 
2312  if (s->workaround_bugs & FF_BUG_EDGE) {
2313  s->h_edge_pos = s->width;
2314  s->v_edge_pos = s->height;
2315  }
2316  return 0;
2317 }
2318 
2326 {
2327  MpegEncContext *s = &ctx->m;
2328  unsigned startcode, v;
2329 
2330  /* search next start code */
2331  align_get_bits(gb);
2332 
2333  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2334  skip_bits(gb, 24);
2335  if (get_bits(gb, 8) == 0xF0)
2336  goto end;
2337  }
2338 
2339  startcode = 0xff;
2340  for (;;) {
2341  if (get_bits_count(gb) >= gb->size_in_bits) {
2342  if (gb->size_in_bits == 8 &&
2343  (ctx->divx_version >= 0 || ctx->xvid_build >= 0)) {
2344  av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2345  return FRAME_SKIPPED; // divx bug
2346  } else
2347  return -1; // end of stream
2348  }
2349 
2350  /* use the bits after the test */
2351  v = get_bits(gb, 8);
2352  startcode = ((startcode << 8) | v) & 0xffffffff;
2353 
2354  if ((startcode & 0xFFFFFF00) != 0x100)
2355  continue; // no startcode
2356 
2357  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2358  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2359  if (startcode <= 0x11F)
2360  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2361  else if (startcode <= 0x12F)
2362  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2363  else if (startcode <= 0x13F)
2364  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2365  else if (startcode <= 0x15F)
2366  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2367  else if (startcode <= 0x1AF)
2368  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2369  else if (startcode == 0x1B0)
2370  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2371  else if (startcode == 0x1B1)
2372  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2373  else if (startcode == 0x1B2)
2374  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2375  else if (startcode == 0x1B3)
2376  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2377  else if (startcode == 0x1B4)
2378  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2379  else if (startcode == 0x1B5)
2380  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2381  else if (startcode == 0x1B6)
2382  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2383  else if (startcode == 0x1B7)
2384  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2385  else if (startcode == 0x1B8)
2386  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2387  else if (startcode == 0x1B9)
2388  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2389  else if (startcode == 0x1BA)
2390  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2391  else if (startcode == 0x1BB)
2392  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2393  else if (startcode == 0x1BC)
2394  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2395  else if (startcode == 0x1BD)
2396  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2397  else if (startcode == 0x1BE)
2398  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2399  else if (startcode == 0x1BF)
2400  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2401  else if (startcode == 0x1C0)
2402  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2403  else if (startcode == 0x1C1)
2404  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2405  else if (startcode == 0x1C2)
2406  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2407  else if (startcode == 0x1C3)
2408  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2409  else if (startcode <= 0x1C5)
2410  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2411  else if (startcode <= 0x1FF)
2412  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2413  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2414  }
2415 
2416  if (startcode >= 0x120 && startcode <= 0x12F) {
2417  if (decode_vol_header(ctx, gb) < 0)
2418  return -1;
2419  } else if (startcode == USER_DATA_STARTCODE) {
2420  decode_user_data(ctx, gb);
2421  } else if (startcode == GOP_STARTCODE) {
2422  mpeg4_decode_gop_header(s, gb);
2423  } else if (startcode == VOS_STARTCODE) {
2425  } else if (startcode == VOP_STARTCODE) {
2426  break;
2427  }
2428 
2429  align_get_bits(gb);
2430  startcode = 0xff;
2431  }
2432 
2433 end:
2434  if (s->flags & CODEC_FLAG_LOW_DELAY)
2435  s->low_delay = 1;
2436  s->avctx->has_b_frames = !s->low_delay;
2437 
2439  if (s->codec_tag == AV_RL32("XVIX"))
2441 
2442  if (s->codec_tag == AV_RL32("UMP4"))
2444 
2445  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2447 
2448  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2450 
2451  if (ctx->xvid_build <= 3U)
2452  s->padding_bug_score = 256 * 256 * 256 * 64;
2453 
2454  if (ctx->xvid_build <= 1U)
2456 
2457  if (ctx->xvid_build <= 12U)
2459 
2460  if (ctx->xvid_build <= 32U)
2462 
2463  if (ctx->lavc_build < 4653U)
2465 
2466  if (ctx->lavc_build < 4655U)
2468 
2469  if (ctx->lavc_build < 4670U)
2471 
2472  if (ctx->lavc_build <= 4712U)
2474 
2475  if (ctx->divx_version >= 0)
2477 
2478  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2479  s->padding_bug_score = 256 * 256 * 256 * 64;
2480 
2481  if (ctx->divx_version < 500U)
2483 
2484  if (ctx->divx_version >= 0)
2486  }
2487 
2488 
2489  if (s->avctx->debug & FF_DEBUG_BUGS)
2491  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2492  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2493  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2494 
2495  return decode_vop_header(ctx, gb);
2496 }
2497 
2498 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2499 {
2500  Mpeg4DecContext *ctx = avctx->priv_data;
2501  MpegEncContext *s = &ctx->m;
2502 
2503  /* divx 5.01+ bistream reorder stuff */
2504  if (s->divx_packed) {
2505  int current_pos = get_bits_count(&s->gb) >> 3;
2506  int startcode_found = 0;
2507 
2508  if (buf_size - current_pos > 5) {
2509  int i;
2510  for (i = current_pos; i < buf_size - 3; i++)
2511  if (buf[i] == 0 &&
2512  buf[i + 1] == 0 &&
2513  buf[i + 2] == 1 &&
2514  buf[i + 3] == 0xB6) {
2515  startcode_found = 1;
2516  break;
2517  }
2518  }
2519  if (s->gb.buffer == s->bitstream_buffer && buf_size > 7 &&
2520  ctx->xvid_build >= 0) { // xvid style
2521  startcode_found = 1;
2522  current_pos = 0;
2523  }
2524 
2525  if (startcode_found) {
2528  buf_size - current_pos +
2530  if (!s->bitstream_buffer)
2531  return AVERROR(ENOMEM);
2532  memcpy(s->bitstream_buffer, buf + current_pos,
2533  buf_size - current_pos);
2534  s->bitstream_buffer_size = buf_size - current_pos;
2535  }
2536  }
2537 
2538  return 0;
2539 }
2540 
2542  const AVCodecContext *src)
2543 {
2544  Mpeg4DecContext *s = dst->priv_data;
2545  const Mpeg4DecContext *s1 = src->priv_data;
2546  int init = s->m.context_initialized;
2547 
2548  int ret = ff_mpeg_update_thread_context(dst, src);
2549 
2550  if (ret < 0)
2551  return ret;
2552 
2553  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2554  ff_xvididct_init(&s->m.idsp, dst);
2555 
2556  s->shape = s1->shape;
2558  s->xvid_build = s1->xvid_build;
2559 
2560  return 0;
2561 }
2562 
2564 {
2565  Mpeg4DecContext *ctx = avctx->priv_data;
2566  MpegEncContext *s = &ctx->m;
2567  int ret;
2568  static int done = 0;
2569 
2570  ctx->divx_version =
2571  ctx->divx_build =
2572  ctx->xvid_build =
2573  ctx->lavc_build = -1;
2574 
2575  if ((ret = ff_h263_decode_init(avctx)) < 0)
2576  return ret;
2577 
2578  if (!done) {
2579  done = 1;
2580 
2587  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2588  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2589  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2590  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2591  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2592  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2593  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2594  &ff_sprite_trajectory_tab[0][1], 4, 2,
2595  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2596  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2597  &ff_mb_type_b_tab[0][1], 2, 1,
2598  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2599  }
2600 
2601  s->h263_pred = 1;
2602  s->low_delay = 0; /* default, might be overriden in the vol header during header parsing */
2604  ctx->time_increment_bits = 4; /* default value for broken headers */
2605 
2607  avctx->internal->allocate_progress = 1;
2608 
2609  return 0;
2610 }
2611 
2613  { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2614  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2615  { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2616  { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2617  { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2618  { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2619  { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2620  { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2621  { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2622  { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2623  { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2624  { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2625  { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2626  { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2627  { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2628  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2629 };
2630 
2632  .name = "mpeg4",
2633  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2634  .type = AVMEDIA_TYPE_VIDEO,
2635  .id = AV_CODEC_ID_MPEG4,
2636  .priv_data_size = sizeof(Mpeg4DecContext),
2637  .init = decode_init,
2640  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2643  .flush = ff_mpeg_flush,
2644  .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2645  .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2646  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2647 };
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
Definition: vf_drawbox.c:37
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.
NULL
Definition: eval.c:55
#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
#define GMC_SPRITE
Definition: mpeg4video.h:51
static int16_t block[64]
Definition: dct-test.c:88