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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 FFmpeg.
7  *
8  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define UNCHECKED_BITSTREAM_READER 1
24 
25 #include "libavutil/opt.h"
26 #include "error_resilience.h"
27 #include "idctdsp.h"
28 #include "internal.h"
29 #include "mpegutils.h"
30 #include "mpegvideo.h"
31 #include "mpeg4video.h"
32 #include "h263.h"
33 #include "thread.h"
34 #include "xvididct.h"
35 
36 /* The defines below define the number of bits that are read at once for
37  * reading vlc values. Changing these may improve speed and data cache needs
38  * be aware though that decreasing them may need the number of stages that is
39  * passed to get_vlc* to be increased. */
40 #define SPRITE_TRAJ_VLC_BITS 6
41 #define DC_VLC_BITS 9
42 #define MB_TYPE_B_VLC_BITS 4
43 
47 
48 static const int mb_type_b_map[4] = {
53 };
54 
55 /**
56  * Predict the ac.
57  * @param n block index (0-3 are luma, 4-5 are chroma)
58  * @param dir the ac prediction direction
59  */
60 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
61 {
62  int i;
63  int16_t *ac_val, *ac_val1;
64  int8_t *const qscale_table = s->current_picture.qscale_table;
65 
66  /* find prediction */
67  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
68  ac_val1 = ac_val;
69  if (s->ac_pred) {
70  if (dir == 0) {
71  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
72  /* left prediction */
73  ac_val -= 16;
74 
75  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
76  n == 1 || n == 3) {
77  /* same qscale */
78  for (i = 1; i < 8; i++)
79  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
80  } else {
81  /* different qscale, we must rescale */
82  for (i = 1; i < 8; i++)
83  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
84  }
85  } else {
86  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
87  /* top prediction */
88  ac_val -= 16 * s->block_wrap[n];
89 
90  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
91  n == 2 || n == 3) {
92  /* same qscale */
93  for (i = 1; i < 8; i++)
94  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
95  } else {
96  /* different qscale, we must rescale */
97  for (i = 1; i < 8; i++)
98  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
99  }
100  }
101  }
102  /* left copy */
103  for (i = 1; i < 8; i++)
104  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
105 
106  /* top copy */
107  for (i = 1; i < 8; i++)
108  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
109 }
110 
111 /**
112  * check if the next stuff is a resync marker or the end.
113  * @return 0 if not
114  */
115 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
116 {
117  MpegEncContext *s = &ctx->m;
118  int bits_count = get_bits_count(&s->gb);
119  int v = show_bits(&s->gb, 16);
120 
122  return 0;
123 
124  while (v <= 0xFF) {
125  if (s->pict_type == AV_PICTURE_TYPE_B ||
126  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
127  break;
128  skip_bits(&s->gb, 8 + s->pict_type);
129  bits_count += 8 + s->pict_type;
130  v = show_bits(&s->gb, 16);
131  }
132 
133  if (bits_count + 8 >= s->gb.size_in_bits) {
134  v >>= 8;
135  v |= 0x7F >> (7 - (bits_count & 7));
136 
137  if (v == 0x7F)
138  return s->mb_num;
139  } else {
140  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
141  int len, mb_num;
142  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
143  GetBitContext gb = s->gb;
144 
145  skip_bits(&s->gb, 1);
146  align_get_bits(&s->gb);
147 
148  for (len = 0; len < 32; len++)
149  if (get_bits1(&s->gb))
150  break;
151 
152  mb_num = get_bits(&s->gb, mb_num_bits);
153  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
154  mb_num= -1;
155 
156  s->gb = gb;
157 
159  return mb_num;
160  }
161  }
162  return 0;
163 }
164 
166 {
167  MpegEncContext *s = &ctx->m;
168  int a = 2 << s->sprite_warping_accuracy;
169  int rho = 3 - s->sprite_warping_accuracy;
170  int r = 16 / a;
171  int alpha = 0;
172  int beta = 0;
173  int w = s->width;
174  int h = s->height;
175  int min_ab, i, w2, h2, w3, h3;
176  int sprite_ref[4][2];
177  int virtual_ref[2][2];
178 
179  // only true for rectangle shapes
180  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
181  { 0, s->height }, { s->width, s->height } };
182  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
183 
184  if (w <= 0 || h <= 0)
185  return AVERROR_INVALIDDATA;
186 
187  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
188  int length;
189  int x = 0, y = 0;
190 
191  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
192  if (length > 0)
193  x = get_xbits(gb, length);
194 
195  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
196  skip_bits1(gb); /* marker bit */
197 
198  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
199  if (length > 0)
200  y = get_xbits(gb, length);
201 
202  skip_bits1(gb); /* marker bit */
203  ctx->sprite_traj[i][0] = d[i][0] = x;
204  ctx->sprite_traj[i][1] = d[i][1] = y;
205  }
206  for (; i < 4; i++)
207  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
208 
209  while ((1 << alpha) < w)
210  alpha++;
211  while ((1 << beta) < h)
212  beta++; /* typo in the mpeg4 std for the definition of w' and h' */
213  w2 = 1 << alpha;
214  h2 = 1 << beta;
215 
216  // Note, the 4th point isn't used for GMC
217  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
218  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
219  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
220  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
221  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
222  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
223  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
224  } else {
225  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
226  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
227  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
228  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
229  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
230  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
231  }
232  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
233  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
234 
235  /* this is mostly identical to the mpeg4 std (and is totally unreadable
236  * because of that...). Perhaps it should be reordered to be more readable.
237  * The idea behind this virtual_ref mess is to be able to use shifts later
238  * per pixel instead of divides so the distance between points is converted
239  * from w&h based to w2&h2 based which are of the 2^x form. */
240  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
241  ROUNDED_DIV(((w - w2) *
242  (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
243  w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
244  virtual_ref[0][1] = 16 * vop_ref[0][1] +
245  ROUNDED_DIV(((w - w2) *
246  (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
247  w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
248  virtual_ref[1][0] = 16 * vop_ref[0][0] +
249  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
250  h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
251  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
252  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
253  h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
254 
255  switch (ctx->num_sprite_warping_points) {
256  case 0:
257  s->sprite_offset[0][0] =
258  s->sprite_offset[0][1] =
259  s->sprite_offset[1][0] =
260  s->sprite_offset[1][1] = 0;
261  s->sprite_delta[0][0] = a;
262  s->sprite_delta[0][1] =
263  s->sprite_delta[1][0] = 0;
264  s->sprite_delta[1][1] = a;
265  ctx->sprite_shift[0] =
266  ctx->sprite_shift[1] = 0;
267  break;
268  case 1: // GMC only
269  s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
270  s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
271  s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
272  a * (vop_ref[0][0] / 2);
273  s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
274  a * (vop_ref[0][1] / 2);
275  s->sprite_delta[0][0] = a;
276  s->sprite_delta[0][1] =
277  s->sprite_delta[1][0] = 0;
278  s->sprite_delta[1][1] = a;
279  ctx->sprite_shift[0] =
280  ctx->sprite_shift[1] = 0;
281  break;
282  case 2:
283  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
284  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
285  (-vop_ref[0][0]) +
286  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
287  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
288  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
289  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
290  (-vop_ref[0][0]) +
291  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
292  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
293  s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
294  (-2 * vop_ref[0][0] + 1) +
295  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
296  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
297  sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
298  s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
299  (-2 * vop_ref[0][0] + 1) +
300  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
301  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
302  sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
303  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
304  s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
305  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
306  s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
307 
308  ctx->sprite_shift[0] = alpha + rho;
309  ctx->sprite_shift[1] = alpha + rho + 2;
310  break;
311  case 3:
312  min_ab = FFMIN(alpha, beta);
313  w3 = w2 >> min_ab;
314  h3 = h2 >> min_ab;
315  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
316  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
317  h3 * (-vop_ref[0][0]) +
318  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
319  w3 * (-vop_ref[0][1]) +
320  (1 << (alpha + beta + rho - min_ab - 1));
321  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
322  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
323  h3 * (-vop_ref[0][0]) +
324  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
325  w3 * (-vop_ref[0][1]) +
326  (1 << (alpha + beta + rho - min_ab - 1));
327  s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
328  h3 * (-2 * vop_ref[0][0] + 1) +
329  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
330  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
331  r * sprite_ref[0][0] - 16 * w2 * h3 +
332  (1 << (alpha + beta + rho - min_ab + 1));
333  s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
334  h3 * (-2 * vop_ref[0][0] + 1) +
335  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
336  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
337  r * sprite_ref[0][1] - 16 * w2 * h3 +
338  (1 << (alpha + beta + rho - min_ab + 1));
339  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
340  s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
341  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
342  s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
343 
344  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
345  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
346  break;
347  }
348  /* try to simplify the situation */
349  if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
350  s->sprite_delta[0][1] == 0 &&
351  s->sprite_delta[1][0] == 0 &&
352  s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
353  s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
354  s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
355  s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
356  s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
357  s->sprite_delta[0][0] = a;
358  s->sprite_delta[0][1] = 0;
359  s->sprite_delta[1][0] = 0;
360  s->sprite_delta[1][1] = a;
361  ctx->sprite_shift[0] = 0;
362  ctx->sprite_shift[1] = 0;
364  } else {
365  int shift_y = 16 - ctx->sprite_shift[0];
366  int shift_c = 16 - ctx->sprite_shift[1];
367  for (i = 0; i < 2; i++) {
368  s->sprite_offset[0][i] <<= shift_y;
369  s->sprite_offset[1][i] <<= shift_c;
370  s->sprite_delta[0][i] <<= shift_y;
371  s->sprite_delta[1][i] <<= shift_y;
372  ctx->sprite_shift[i] = 16;
373  }
375  }
376 
377  return 0;
378 }
379 
381  int len = FFMIN(ctx->time_increment_bits + 3, 15);
382 
383  get_bits(gb, len);
384  if (get_bits1(gb))
385  get_bits(gb, len);
386  check_marker(gb, "after new_pred");
387 
388  return 0;
389 }
390 
391 /**
392  * Decode the next video packet.
393  * @return <0 if something went wrong
394  */
396 {
397  MpegEncContext *s = &ctx->m;
398 
399  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
400  int header_extension = 0, mb_num, len;
401 
402  /* is there enough space left for a video packet + header */
403  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
404  return -1;
405 
406  for (len = 0; len < 32; len++)
407  if (get_bits1(&s->gb))
408  break;
409 
411  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
412  return -1;
413  }
414 
415  if (ctx->shape != RECT_SHAPE) {
416  header_extension = get_bits1(&s->gb);
417  // FIXME more stuff here
418  }
419 
420  mb_num = get_bits(&s->gb, mb_num_bits);
421  if (mb_num >= s->mb_num) {
423  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
424  return -1;
425  }
426 
427  s->mb_x = mb_num % s->mb_width;
428  s->mb_y = mb_num / s->mb_width;
429 
430  if (ctx->shape != BIN_ONLY_SHAPE) {
431  int qscale = get_bits(&s->gb, s->quant_precision);
432  if (qscale)
433  s->chroma_qscale = s->qscale = qscale;
434  }
435 
436  if (ctx->shape == RECT_SHAPE)
437  header_extension = get_bits1(&s->gb);
438 
439  if (header_extension) {
440  int time_incr = 0;
441 
442  while (get_bits1(&s->gb) != 0)
443  time_incr++;
444 
445  check_marker(&s->gb, "before time_increment in video packed header");
446  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
447  check_marker(&s->gb, "before vop_coding_type in video packed header");
448 
449  skip_bits(&s->gb, 2); /* vop coding type */
450  // FIXME not rect stuff here
451 
452  if (ctx->shape != BIN_ONLY_SHAPE) {
453  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
454  // FIXME don't just ignore everything
455  if (s->pict_type == AV_PICTURE_TYPE_S &&
456  ctx->vol_sprite_usage == GMC_SPRITE) {
457  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
458  return AVERROR_INVALIDDATA;
459  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
460  }
461 
462  // FIXME reduced res stuff here
463 
464  if (s->pict_type != AV_PICTURE_TYPE_I) {
465  int f_code = get_bits(&s->gb, 3); /* fcode_for */
466  if (f_code == 0)
468  "Error, video packet header damaged (f_code=0)\n");
469  }
470  if (s->pict_type == AV_PICTURE_TYPE_B) {
471  int b_code = get_bits(&s->gb, 3);
472  if (b_code == 0)
474  "Error, video packet header damaged (b_code=0)\n");
475  }
476  }
477  }
478  if (ctx->new_pred)
479  decode_new_pred(ctx, &s->gb);
480 
481  return 0;
482 }
483 
484 /**
485  * Get the average motion vector for a GMC MB.
486  * @param n either 0 for the x component or 1 for y
487  * @return the average MV for a GMC MB
488  */
489 static inline int get_amv(Mpeg4DecContext *ctx, int n)
490 {
491  MpegEncContext *s = &ctx->m;
492  int x, y, mb_v, sum, dx, dy, shift;
493  int len = 1 << (s->f_code + 4);
494  const int a = s->sprite_warping_accuracy;
495 
496  if (s->workaround_bugs & FF_BUG_AMV)
497  len >>= s->quarter_sample;
498 
499  if (s->real_sprite_warping_points == 1) {
500  if (ctx->divx_version == 500 && ctx->divx_build == 413)
501  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
502  else
503  sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
504  } else {
505  dx = s->sprite_delta[n][0];
506  dy = s->sprite_delta[n][1];
507  shift = ctx->sprite_shift[0];
508  if (n)
509  dy -= 1 << (shift + a + 1);
510  else
511  dx -= 1 << (shift + a + 1);
512  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
513 
514  sum = 0;
515  for (y = 0; y < 16; y++) {
516  int v;
517 
518  v = mb_v + dy * y;
519  // FIXME optimize
520  for (x = 0; x < 16; x++) {
521  sum += v >> shift;
522  v += dx;
523  }
524  }
525  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
526  }
527 
528  if (sum < -len)
529  sum = -len;
530  else if (sum >= len)
531  sum = len - 1;
532 
533  return sum;
534 }
535 
536 /**
537  * Decode the dc value.
538  * @param n block index (0-3 are luma, 4-5 are chroma)
539  * @param dir_ptr the prediction direction will be stored here
540  * @return the quantized dc
541  */
542 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
543 {
544  int level, code;
545 
546  if (n < 4)
547  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
548  else
549  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
550 
551  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
552  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
553  return -1;
554  }
555 
556  if (code == 0) {
557  level = 0;
558  } else {
559  if (IS_3IV1) {
560  if (code == 1)
561  level = 2 * get_bits1(&s->gb) - 1;
562  else {
563  if (get_bits1(&s->gb))
564  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
565  else
566  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
567  }
568  } else {
569  level = get_xbits(&s->gb, code);
570  }
571 
572  if (code > 8) {
573  if (get_bits1(&s->gb) == 0) { /* marker */
575  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
576  return -1;
577  }
578  }
579  }
580  }
581 
582  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
583 }
584 
585 /**
586  * Decode first partition.
587  * @return number of MBs decoded or <0 if an error occurred
588  */
590 {
591  MpegEncContext *s = &ctx->m;
592  int mb_num = 0;
593  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
594 
595  /* decode first partition */
596  s->first_slice_line = 1;
597  for (; s->mb_y < s->mb_height; s->mb_y++) {
599  for (; s->mb_x < s->mb_width; s->mb_x++) {
600  const int xy = s->mb_x + s->mb_y * s->mb_stride;
601  int cbpc;
602  int dir = 0;
603 
604  mb_num++;
606  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
607  s->first_slice_line = 0;
608 
609  if (s->pict_type == AV_PICTURE_TYPE_I) {
610  int i;
611 
612  do {
613  if (show_bits_long(&s->gb, 19) == DC_MARKER)
614  return mb_num - 1;
615 
617  if (cbpc < 0) {
619  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
620  return -1;
621  }
622  } while (cbpc == 8);
623 
624  s->cbp_table[xy] = cbpc & 3;
626  s->mb_intra = 1;
627 
628  if (cbpc & 4)
629  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
630 
631  s->current_picture.qscale_table[xy] = s->qscale;
632 
633  s->mbintra_table[xy] = 1;
634  for (i = 0; i < 6; i++) {
635  int dc_pred_dir;
636  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
637  if (dc < 0) {
639  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
640  return -1;
641  }
642  dir <<= 1;
643  if (dc_pred_dir)
644  dir |= 1;
645  }
646  s->pred_dir_table[xy] = dir;
647  } else { /* P/S_TYPE */
648  int mx, my, pred_x, pred_y, bits;
649  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
650  const int stride = s->b8_stride * 2;
651 
652 try_again:
653  bits = show_bits(&s->gb, 17);
654  if (bits == MOTION_MARKER)
655  return mb_num - 1;
656 
657  skip_bits1(&s->gb);
658  if (bits & 0x10000) {
659  /* skip mb */
660  if (s->pict_type == AV_PICTURE_TYPE_S &&
661  ctx->vol_sprite_usage == GMC_SPRITE) {
663  MB_TYPE_16x16 |
664  MB_TYPE_GMC |
665  MB_TYPE_L0;
666  mx = get_amv(ctx, 0);
667  my = get_amv(ctx, 1);
668  } else {
670  MB_TYPE_16x16 |
671  MB_TYPE_L0;
672  mx = my = 0;
673  }
674  mot_val[0] =
675  mot_val[2] =
676  mot_val[0 + stride] =
677  mot_val[2 + stride] = mx;
678  mot_val[1] =
679  mot_val[3] =
680  mot_val[1 + stride] =
681  mot_val[3 + stride] = my;
682 
683  if (s->mbintra_table[xy])
685  continue;
686  }
687 
689  if (cbpc < 0) {
691  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
692  return -1;
693  }
694  if (cbpc == 20)
695  goto try_again;
696 
697  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
698 
699  s->mb_intra = ((cbpc & 4) != 0);
700 
701  if (s->mb_intra) {
703  s->mbintra_table[xy] = 1;
704  mot_val[0] =
705  mot_val[2] =
706  mot_val[0 + stride] =
707  mot_val[2 + stride] = 0;
708  mot_val[1] =
709  mot_val[3] =
710  mot_val[1 + stride] =
711  mot_val[3 + stride] = 0;
712  } else {
713  if (s->mbintra_table[xy])
715 
716  if (s->pict_type == AV_PICTURE_TYPE_S &&
717  ctx->vol_sprite_usage == GMC_SPRITE &&
718  (cbpc & 16) == 0)
719  s->mcsel = get_bits1(&s->gb);
720  else
721  s->mcsel = 0;
722 
723  if ((cbpc & 16) == 0) {
724  /* 16x16 motion prediction */
725 
726  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
727  if (!s->mcsel) {
728  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
729  if (mx >= 0xffff)
730  return -1;
731 
732  my = ff_h263_decode_motion(s, pred_y, s->f_code);
733  if (my >= 0xffff)
734  return -1;
736  MB_TYPE_L0;
737  } else {
738  mx = get_amv(ctx, 0);
739  my = get_amv(ctx, 1);
741  MB_TYPE_GMC |
742  MB_TYPE_L0;
743  }
744 
745  mot_val[0] =
746  mot_val[2] =
747  mot_val[0 + stride] =
748  mot_val[2 + stride] = mx;
749  mot_val[1] =
750  mot_val[3] =
751  mot_val[1 + stride] =
752  mot_val[3 + stride] = my;
753  } else {
754  int i;
756  MB_TYPE_L0;
757  for (i = 0; i < 4; i++) {
758  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
759  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
760  if (mx >= 0xffff)
761  return -1;
762 
763  my = ff_h263_decode_motion(s, pred_y, s->f_code);
764  if (my >= 0xffff)
765  return -1;
766  mot_val[0] = mx;
767  mot_val[1] = my;
768  }
769  }
770  }
771  }
772  }
773  s->mb_x = 0;
774  }
775 
776  return mb_num;
777 }
778 
779 /**
780  * decode second partition.
781  * @return <0 if an error occurred
782  */
783 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
784 {
785  int mb_num = 0;
786  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
787 
788  s->mb_x = s->resync_mb_x;
789  s->first_slice_line = 1;
790  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
792  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
793  const int xy = s->mb_x + s->mb_y * s->mb_stride;
794 
795  mb_num++;
797  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
798  s->first_slice_line = 0;
799 
800  if (s->pict_type == AV_PICTURE_TYPE_I) {
801  int ac_pred = get_bits1(&s->gb);
802  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
803  if (cbpy < 0) {
805  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
806  return -1;
807  }
808 
809  s->cbp_table[xy] |= cbpy << 2;
810  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
811  } else { /* P || S_TYPE */
812  if (IS_INTRA(s->current_picture.mb_type[xy])) {
813  int i;
814  int dir = 0;
815  int ac_pred = get_bits1(&s->gb);
816  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
817 
818  if (cbpy < 0) {
820  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
821  return -1;
822  }
823 
824  if (s->cbp_table[xy] & 8)
825  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
826  s->current_picture.qscale_table[xy] = s->qscale;
827 
828  for (i = 0; i < 6; i++) {
829  int dc_pred_dir;
830  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
831  if (dc < 0) {
833  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
834  return -1;
835  }
836  dir <<= 1;
837  if (dc_pred_dir)
838  dir |= 1;
839  }
840  s->cbp_table[xy] &= 3; // remove dquant
841  s->cbp_table[xy] |= cbpy << 2;
842  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
843  s->pred_dir_table[xy] = dir;
844  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
845  s->current_picture.qscale_table[xy] = s->qscale;
846  s->cbp_table[xy] = 0;
847  } else {
848  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
849 
850  if (cbpy < 0) {
852  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
853  return -1;
854  }
855 
856  if (s->cbp_table[xy] & 8)
857  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
858  s->current_picture.qscale_table[xy] = s->qscale;
859 
860  s->cbp_table[xy] &= 3; // remove dquant
861  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
862  }
863  }
864  }
865  if (mb_num >= mb_count)
866  return 0;
867  s->mb_x = 0;
868  }
869  return 0;
870 }
871 
872 /**
873  * Decode the first and second partition.
874  * @return <0 if error (and sets error type in the error_status_table)
875  */
877 {
878  MpegEncContext *s = &ctx->m;
879  int mb_num;
880  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
881  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
882 
883  mb_num = mpeg4_decode_partition_a(ctx);
884  if (mb_num <= 0) {
886  s->mb_x, s->mb_y, part_a_error);
887  return -1;
888  }
889 
890  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
891  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
893  s->mb_x, s->mb_y, part_a_error);
894  return -1;
895  }
896 
897  s->mb_num_left = mb_num;
898 
899  if (s->pict_type == AV_PICTURE_TYPE_I) {
900  while (show_bits(&s->gb, 9) == 1)
901  skip_bits(&s->gb, 9);
902  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
904  "marker missing after first I partition at %d %d\n",
905  s->mb_x, s->mb_y);
906  return -1;
907  }
908  } else {
909  while (show_bits(&s->gb, 10) == 1)
910  skip_bits(&s->gb, 10);
911  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
913  "marker missing after first P partition at %d %d\n",
914  s->mb_x, s->mb_y);
915  return -1;
916  }
917  }
919  s->mb_x - 1, s->mb_y, part_a_end);
920 
921  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
922  if (s->pict_type == AV_PICTURE_TYPE_P)
924  s->mb_x, s->mb_y, ER_DC_ERROR);
925  return -1;
926  } else {
927  if (s->pict_type == AV_PICTURE_TYPE_P)
929  s->mb_x - 1, s->mb_y, ER_DC_END);
930  }
931 
932  return 0;
933 }
934 
935 /**
936  * Decode a block.
937  * @return <0 if an error occurred
938  */
939 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
940  int n, int coded, int intra, int rvlc)
941 {
942  MpegEncContext *s = &ctx->m;
943  int level, i, last, run, qmul, qadd;
944  int av_uninit(dc_pred_dir);
945  RLTable *rl;
946  RL_VLC_ELEM *rl_vlc;
947  const uint8_t *scan_table;
948 
949  // Note intra & rvlc should be optimized away if this is inlined
950 
951  if (intra) {
952  if (ctx->use_intra_dc_vlc) {
953  /* DC coef */
954  if (s->partitioned_frame) {
955  level = s->dc_val[0][s->block_index[n]];
956  if (n < 4)
957  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
958  else
959  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
960  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
961  } else {
962  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
963  if (level < 0)
964  return -1;
965  }
966  block[0] = level;
967  i = 0;
968  } else {
969  i = -1;
970  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
971  }
972  if (!coded)
973  goto not_coded;
974 
975  if (rvlc) {
976  rl = &ff_rvlc_rl_intra;
977  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
978  } else {
979  rl = &ff_mpeg4_rl_intra;
980  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
981  }
982  if (s->ac_pred) {
983  if (dc_pred_dir == 0)
984  scan_table = s->intra_v_scantable.permutated; /* left */
985  else
986  scan_table = s->intra_h_scantable.permutated; /* top */
987  } else {
988  scan_table = s->intra_scantable.permutated;
989  }
990  qmul = 1;
991  qadd = 0;
992  } else {
993  i = -1;
994  if (!coded) {
995  s->block_last_index[n] = i;
996  return 0;
997  }
998  if (rvlc)
999  rl = &ff_rvlc_rl_inter;
1000  else
1001  rl = &ff_h263_rl_inter;
1002 
1003  scan_table = s->intra_scantable.permutated;
1004 
1005  if (s->mpeg_quant) {
1006  qmul = 1;
1007  qadd = 0;
1008  if (rvlc)
1009  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1010  else
1011  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1012  } else {
1013  qmul = s->qscale << 1;
1014  qadd = (s->qscale - 1) | 1;
1015  if (rvlc)
1016  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1017  else
1018  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1019  }
1020  }
1021  {
1022  OPEN_READER(re, &s->gb);
1023  for (;;) {
1024  UPDATE_CACHE(re, &s->gb);
1025  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1026  if (level == 0) {
1027  /* escape */
1028  if (rvlc) {
1029  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1031  "1. marker bit missing in rvlc esc\n");
1032  return -1;
1033  }
1034  SKIP_CACHE(re, &s->gb, 1);
1035 
1036  last = SHOW_UBITS(re, &s->gb, 1);
1037  SKIP_CACHE(re, &s->gb, 1);
1038  run = SHOW_UBITS(re, &s->gb, 6);
1039  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1040  UPDATE_CACHE(re, &s->gb);
1041 
1042  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1044  "2. marker bit missing in rvlc esc\n");
1045  return -1;
1046  }
1047  SKIP_CACHE(re, &s->gb, 1);
1048 
1049  level = SHOW_UBITS(re, &s->gb, 11);
1050  SKIP_CACHE(re, &s->gb, 11);
1051 
1052  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1053  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1054  return -1;
1055  }
1056  SKIP_CACHE(re, &s->gb, 5);
1057 
1058  level = level * qmul + qadd;
1059  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1060  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1061 
1062  i += run + 1;
1063  if (last)
1064  i += 192;
1065  } else {
1066  int cache;
1067  cache = GET_CACHE(re, &s->gb);
1068 
1069  if (IS_3IV1)
1070  cache ^= 0xC0000000;
1071 
1072  if (cache & 0x80000000) {
1073  if (cache & 0x40000000) {
1074  /* third escape */
1075  SKIP_CACHE(re, &s->gb, 2);
1076  last = SHOW_UBITS(re, &s->gb, 1);
1077  SKIP_CACHE(re, &s->gb, 1);
1078  run = SHOW_UBITS(re, &s->gb, 6);
1079  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1080  UPDATE_CACHE(re, &s->gb);
1081 
1082  if (IS_3IV1) {
1083  level = SHOW_SBITS(re, &s->gb, 12);
1084  LAST_SKIP_BITS(re, &s->gb, 12);
1085  } else {
1086  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1088  "1. marker bit missing in 3. esc\n");
1089  if (!(s->err_recognition & AV_EF_IGNORE_ERR))
1090  return -1;
1091  }
1092  SKIP_CACHE(re, &s->gb, 1);
1093 
1094  level = SHOW_SBITS(re, &s->gb, 12);
1095  SKIP_CACHE(re, &s->gb, 12);
1096 
1097  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1099  "2. marker bit missing in 3. esc\n");
1100  if (!(s->err_recognition & AV_EF_IGNORE_ERR))
1101  return -1;
1102  }
1103 
1104  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1105  }
1106 
1107 #if 0
1108  if (s->error_recognition >= FF_ER_COMPLIANT) {
1109  const int abs_level= FFABS(level);
1110  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1111  const int run1= run - rl->max_run[last][abs_level] - 1;
1112  if (abs_level <= rl->max_level[last][run]) {
1113  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1114  return -1;
1115  }
1116  if (s->error_recognition > FF_ER_COMPLIANT) {
1117  if (abs_level <= rl->max_level[last][run]*2) {
1118  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1119  return -1;
1120  }
1121  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1122  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1123  return -1;
1124  }
1125  }
1126  }
1127  }
1128 #endif
1129  if (level > 0)
1130  level = level * qmul + qadd;
1131  else
1132  level = level * qmul - qadd;
1133 
1134  if ((unsigned)(level + 2048) > 4095) {
1136  if (level > 2560 || level < -2560) {
1138  "|level| overflow in 3. esc, qp=%d\n",
1139  s->qscale);
1140  return -1;
1141  }
1142  }
1143  level = level < 0 ? -2048 : 2047;
1144  }
1145 
1146  i += run + 1;
1147  if (last)
1148  i += 192;
1149  } else {
1150  /* second escape */
1151  SKIP_BITS(re, &s->gb, 2);
1152  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1153  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1154  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1155  LAST_SKIP_BITS(re, &s->gb, 1);
1156  }
1157  } else {
1158  /* first escape */
1159  SKIP_BITS(re, &s->gb, 1);
1160  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1161  i += run;
1162  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1163  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1164  LAST_SKIP_BITS(re, &s->gb, 1);
1165  }
1166  }
1167  } else {
1168  i += run;
1169  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1170  LAST_SKIP_BITS(re, &s->gb, 1);
1171  }
1172  tprintf(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1173  if (i > 62) {
1174  i -= 192;
1175  if (i & (~63)) {
1177  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1178  return -1;
1179  }
1180 
1181  block[scan_table[i]] = level;
1182  break;
1183  }
1184 
1185  block[scan_table[i]] = level;
1186  }
1187  CLOSE_READER(re, &s->gb);
1188  }
1189 
1190 not_coded:
1191  if (intra) {
1192  if (!ctx->use_intra_dc_vlc) {
1193  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1194 
1195  i -= i >> 31; // if (i == -1) i = 0;
1196  }
1197 
1198  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1199  if (s->ac_pred)
1200  i = 63; // FIXME not optimal
1201  }
1202  s->block_last_index[n] = i;
1203  return 0;
1204 }
1205 
1206 /**
1207  * decode partition C of one MB.
1208  * @return <0 if an error occurred
1209  */
1211 {
1212  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1213  int cbp, mb_type;
1214  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1215 
1216  mb_type = s->current_picture.mb_type[xy];
1217  cbp = s->cbp_table[xy];
1218 
1219  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1220 
1221  if (s->current_picture.qscale_table[xy] != s->qscale)
1223 
1224  if (s->pict_type == AV_PICTURE_TYPE_P ||
1225  s->pict_type == AV_PICTURE_TYPE_S) {
1226  int i;
1227  for (i = 0; i < 4; i++) {
1228  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1229  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1230  }
1231  s->mb_intra = IS_INTRA(mb_type);
1232 
1233  if (IS_SKIP(mb_type)) {
1234  /* skip mb */
1235  for (i = 0; i < 6; i++)
1236  s->block_last_index[i] = -1;
1237  s->mv_dir = MV_DIR_FORWARD;
1238  s->mv_type = MV_TYPE_16X16;
1240  && ctx->vol_sprite_usage == GMC_SPRITE) {
1241  s->mcsel = 1;
1242  s->mb_skipped = 0;
1243  } else {
1244  s->mcsel = 0;
1245  s->mb_skipped = 1;
1246  }
1247  } else if (s->mb_intra) {
1249  } else if (!s->mb_intra) {
1250  // s->mcsel = 0; // FIXME do we need to init that?
1251 
1252  s->mv_dir = MV_DIR_FORWARD;
1253  if (IS_8X8(mb_type)) {
1254  s->mv_type = MV_TYPE_8X8;
1255  } else {
1256  s->mv_type = MV_TYPE_16X16;
1257  }
1258  }
1259  } else { /* I-Frame */
1260  s->mb_intra = 1;
1262  }
1263 
1264  if (!IS_SKIP(mb_type)) {
1265  int i;
1266  s->bdsp.clear_blocks(s->block[0]);
1267  /* decode each block */
1268  for (i = 0; i < 6; i++) {
1269  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1271  "texture corrupted at %d %d %d\n",
1272  s->mb_x, s->mb_y, s->mb_intra);
1273  return -1;
1274  }
1275  cbp += cbp;
1276  }
1277  }
1278 
1279  /* per-MB end of slice check */
1280  if (--s->mb_num_left <= 0) {
1281  if (mpeg4_is_resync(ctx))
1282  return SLICE_END;
1283  else
1284  return SLICE_NOEND;
1285  } else {
1286  if (mpeg4_is_resync(ctx)) {
1287  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1288  if (s->cbp_table[xy + delta])
1289  return SLICE_END;
1290  }
1291  return SLICE_OK;
1292  }
1293 }
1294 
1295 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1296 {
1297  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1298  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1299  int16_t *mot_val;
1300  static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1301  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1302 
1303  av_assert2(s->h263_pred);
1304 
1305  if (s->pict_type == AV_PICTURE_TYPE_P ||
1306  s->pict_type == AV_PICTURE_TYPE_S) {
1307  do {
1308  if (get_bits1(&s->gb)) {
1309  /* skip mb */
1310  s->mb_intra = 0;
1311  for (i = 0; i < 6; i++)
1312  s->block_last_index[i] = -1;
1313  s->mv_dir = MV_DIR_FORWARD;
1314  s->mv_type = MV_TYPE_16X16;
1315  if (s->pict_type == AV_PICTURE_TYPE_S &&
1316  ctx->vol_sprite_usage == GMC_SPRITE) {
1318  MB_TYPE_GMC |
1319  MB_TYPE_16x16 |
1320  MB_TYPE_L0;
1321  s->mcsel = 1;
1322  s->mv[0][0][0] = get_amv(ctx, 0);
1323  s->mv[0][0][1] = get_amv(ctx, 1);
1324  s->mb_skipped = 0;
1325  } else {
1327  MB_TYPE_16x16 |
1328  MB_TYPE_L0;
1329  s->mcsel = 0;
1330  s->mv[0][0][0] = 0;
1331  s->mv[0][0][1] = 0;
1332  s->mb_skipped = 1;
1333  }
1334  goto end;
1335  }
1337  if (cbpc < 0) {
1339  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1340  return -1;
1341  }
1342  } while (cbpc == 20);
1343 
1344  s->bdsp.clear_blocks(s->block[0]);
1345  dquant = cbpc & 8;
1346  s->mb_intra = ((cbpc & 4) != 0);
1347  if (s->mb_intra)
1348  goto intra;
1349 
1350  if (s->pict_type == AV_PICTURE_TYPE_S &&
1351  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1352  s->mcsel = get_bits1(&s->gb);
1353  else
1354  s->mcsel = 0;
1355  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1356 
1357  cbp = (cbpc & 3) | (cbpy << 2);
1358  if (dquant)
1359  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1360  if ((!s->progressive_sequence) &&
1361  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1362  s->interlaced_dct = get_bits1(&s->gb);
1363 
1364  s->mv_dir = MV_DIR_FORWARD;
1365  if ((cbpc & 16) == 0) {
1366  if (s->mcsel) {
1368  MB_TYPE_16x16 |
1369  MB_TYPE_L0;
1370  /* 16x16 global motion prediction */
1371  s->mv_type = MV_TYPE_16X16;
1372  mx = get_amv(ctx, 0);
1373  my = get_amv(ctx, 1);
1374  s->mv[0][0][0] = mx;
1375  s->mv[0][0][1] = my;
1376  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1378  MB_TYPE_L0 |
1380  /* 16x8 field motion prediction */
1381  s->mv_type = MV_TYPE_FIELD;
1382 
1383  s->field_select[0][0] = get_bits1(&s->gb);
1384  s->field_select[0][1] = get_bits1(&s->gb);
1385 
1386  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1387 
1388  for (i = 0; i < 2; i++) {
1389  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1390  if (mx >= 0xffff)
1391  return -1;
1392 
1393  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1394  if (my >= 0xffff)
1395  return -1;
1396 
1397  s->mv[0][i][0] = mx;
1398  s->mv[0][i][1] = my;
1399  }
1400  } else {
1402  /* 16x16 motion prediction */
1403  s->mv_type = MV_TYPE_16X16;
1404  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1405  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1406 
1407  if (mx >= 0xffff)
1408  return -1;
1409 
1410  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1411 
1412  if (my >= 0xffff)
1413  return -1;
1414  s->mv[0][0][0] = mx;
1415  s->mv[0][0][1] = my;
1416  }
1417  } else {
1419  s->mv_type = MV_TYPE_8X8;
1420  for (i = 0; i < 4; i++) {
1421  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1422  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1423  if (mx >= 0xffff)
1424  return -1;
1425 
1426  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1427  if (my >= 0xffff)
1428  return -1;
1429  s->mv[0][i][0] = mx;
1430  s->mv[0][i][1] = my;
1431  mot_val[0] = mx;
1432  mot_val[1] = my;
1433  }
1434  }
1435  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1436  int modb1; // first bit of modb
1437  int modb2; // second bit of modb
1438  int mb_type;
1439 
1440  s->mb_intra = 0; // B-frames never contain intra blocks
1441  s->mcsel = 0; // ... true gmc blocks
1442 
1443  if (s->mb_x == 0) {
1444  for (i = 0; i < 2; i++) {
1445  s->last_mv[i][0][0] =
1446  s->last_mv[i][0][1] =
1447  s->last_mv[i][1][0] =
1448  s->last_mv[i][1][1] = 0;
1449  }
1450 
1452  }
1453 
1454  /* if we skipped it in the future P Frame than skip it now too */
1455  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1456 
1457  if (s->mb_skipped) {
1458  /* skip mb */
1459  for (i = 0; i < 6; i++)
1460  s->block_last_index[i] = -1;
1461 
1462  s->mv_dir = MV_DIR_FORWARD;
1463  s->mv_type = MV_TYPE_16X16;
1464  s->mv[0][0][0] =
1465  s->mv[0][0][1] =
1466  s->mv[1][0][0] =
1467  s->mv[1][0][1] = 0;
1469  MB_TYPE_16x16 |
1470  MB_TYPE_L0;
1471  goto end;
1472  }
1473 
1474  modb1 = get_bits1(&s->gb);
1475  if (modb1) {
1476  // like MB_TYPE_B_DIRECT but no vectors coded
1478  cbp = 0;
1479  } else {
1480  modb2 = get_bits1(&s->gb);
1481  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1482  if (mb_type < 0) {
1483  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1484  return -1;
1485  }
1486  mb_type = mb_type_b_map[mb_type];
1487  if (modb2) {
1488  cbp = 0;
1489  } else {
1490  s->bdsp.clear_blocks(s->block[0]);
1491  cbp = get_bits(&s->gb, 6);
1492  }
1493 
1494  if ((!IS_DIRECT(mb_type)) && cbp) {
1495  if (get_bits1(&s->gb))
1496  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1497  }
1498 
1499  if (!s->progressive_sequence) {
1500  if (cbp)
1501  s->interlaced_dct = get_bits1(&s->gb);
1502 
1503  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1504  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1505  mb_type &= ~MB_TYPE_16x16;
1506 
1507  if (USES_LIST(mb_type, 0)) {
1508  s->field_select[0][0] = get_bits1(&s->gb);
1509  s->field_select[0][1] = get_bits1(&s->gb);
1510  }
1511  if (USES_LIST(mb_type, 1)) {
1512  s->field_select[1][0] = get_bits1(&s->gb);
1513  s->field_select[1][1] = get_bits1(&s->gb);
1514  }
1515  }
1516  }
1517 
1518  s->mv_dir = 0;
1519  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1520  s->mv_type = MV_TYPE_16X16;
1521 
1522  if (USES_LIST(mb_type, 0)) {
1523  s->mv_dir = MV_DIR_FORWARD;
1524 
1525  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1526  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1527  s->last_mv[0][1][0] =
1528  s->last_mv[0][0][0] =
1529  s->mv[0][0][0] = mx;
1530  s->last_mv[0][1][1] =
1531  s->last_mv[0][0][1] =
1532  s->mv[0][0][1] = my;
1533  }
1534 
1535  if (USES_LIST(mb_type, 1)) {
1536  s->mv_dir |= MV_DIR_BACKWARD;
1537 
1538  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1539  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1540  s->last_mv[1][1][0] =
1541  s->last_mv[1][0][0] =
1542  s->mv[1][0][0] = mx;
1543  s->last_mv[1][1][1] =
1544  s->last_mv[1][0][1] =
1545  s->mv[1][0][1] = my;
1546  }
1547  } else if (!IS_DIRECT(mb_type)) {
1548  s->mv_type = MV_TYPE_FIELD;
1549 
1550  if (USES_LIST(mb_type, 0)) {
1551  s->mv_dir = MV_DIR_FORWARD;
1552 
1553  for (i = 0; i < 2; i++) {
1554  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1555  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1556  s->last_mv[0][i][0] =
1557  s->mv[0][i][0] = mx;
1558  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1559  }
1560  }
1561 
1562  if (USES_LIST(mb_type, 1)) {
1563  s->mv_dir |= MV_DIR_BACKWARD;
1564 
1565  for (i = 0; i < 2; i++) {
1566  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1567  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1568  s->last_mv[1][i][0] =
1569  s->mv[1][i][0] = mx;
1570  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1571  }
1572  }
1573  }
1574  }
1575 
1576  if (IS_DIRECT(mb_type)) {
1577  if (IS_SKIP(mb_type)) {
1578  mx =
1579  my = 0;
1580  } else {
1581  mx = ff_h263_decode_motion(s, 0, 1);
1582  my = ff_h263_decode_motion(s, 0, 1);
1583  }
1584 
1586  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1587  }
1588  s->current_picture.mb_type[xy] = mb_type;
1589  } else { /* I-Frame */
1590  do {
1592  if (cbpc < 0) {
1594  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1595  return -1;
1596  }
1597  } while (cbpc == 8);
1598 
1599  dquant = cbpc & 4;
1600  s->mb_intra = 1;
1601 
1602 intra:
1603  s->ac_pred = get_bits1(&s->gb);
1604  if (s->ac_pred)
1606  else
1608 
1609  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1610  if (cbpy < 0) {
1612  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1613  return -1;
1614  }
1615  cbp = (cbpc & 3) | (cbpy << 2);
1616 
1617  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1618 
1619  if (dquant)
1620  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1621 
1622  if (!s->progressive_sequence)
1623  s->interlaced_dct = get_bits1(&s->gb);
1624 
1625  s->bdsp.clear_blocks(s->block[0]);
1626  /* decode each block */
1627  for (i = 0; i < 6; i++) {
1628  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1629  return -1;
1630  cbp += cbp;
1631  }
1632  goto end;
1633  }
1634 
1635  /* decode each block */
1636  for (i = 0; i < 6; i++) {
1637  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1638  return -1;
1639  cbp += cbp;
1640  }
1641 
1642 end:
1643  /* per-MB end of slice check */
1644  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1645  int next = mpeg4_is_resync(ctx);
1646  if (next) {
1647  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1648  return -1;
1649  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1650  return SLICE_END;
1651 
1652  if (s->pict_type == AV_PICTURE_TYPE_B) {
1653  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1655  (s->mb_x + delta >= s->mb_width)
1656  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1657  : s->mb_y, 0);
1658  if (s->next_picture.mbskip_table[xy + delta])
1659  return SLICE_OK;
1660  }
1661 
1662  return SLICE_END;
1663  }
1664  }
1665 
1666  return SLICE_OK;
1667 }
1668 
1670 {
1671  int hours, minutes, seconds;
1672 
1673  if (!show_bits(gb, 23)) {
1674  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1675  return -1;
1676  }
1677 
1678  hours = get_bits(gb, 5);
1679  minutes = get_bits(gb, 6);
1680  skip_bits1(gb);
1681  seconds = get_bits(gb, 6);
1682 
1683  s->time_base = seconds + 60*(minutes + 60*hours);
1684 
1685  skip_bits1(gb);
1686  skip_bits1(gb);
1687 
1688  return 0;
1689 }
1690 
1692 {
1693 
1694  s->avctx->profile = get_bits(gb, 4);
1695  s->avctx->level = get_bits(gb, 4);
1696 
1697  // for Simple profile, level 0
1698  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1699  s->avctx->level = 0;
1700  }
1701 
1702  return 0;
1703 }
1704 
1706 {
1707  MpegEncContext *s = &ctx->m;
1708  int width, height, vo_ver_id;
1709 
1710  /* vol header */
1711  skip_bits(gb, 1); /* random access */
1712  s->vo_type = get_bits(gb, 8);
1713  if (get_bits1(gb) != 0) { /* is_ol_id */
1714  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1715  skip_bits(gb, 3); /* vo_priority */
1716  } else {
1717  vo_ver_id = 1;
1718  }
1719  s->aspect_ratio_info = get_bits(gb, 4);
1721  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1722  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1723  } else {
1725  }
1726 
1727  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1728  int chroma_format = get_bits(gb, 2);
1729  if (chroma_format != CHROMA_420)
1730  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1731 
1732  s->low_delay = get_bits1(gb);
1733  if (get_bits1(gb)) { /* vbv parameters */
1734  get_bits(gb, 15); /* first_half_bitrate */
1735  skip_bits1(gb); /* marker */
1736  get_bits(gb, 15); /* latter_half_bitrate */
1737  skip_bits1(gb); /* marker */
1738  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1739  skip_bits1(gb); /* marker */
1740  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1741  get_bits(gb, 11); /* first_half_vbv_occupancy */
1742  skip_bits1(gb); /* marker */
1743  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1744  skip_bits1(gb); /* marker */
1745  }
1746  } else {
1747  /* is setting low delay flag only once the smartest thing to do?
1748  * low delay detection won't be overridden. */
1749  if (s->picture_number == 0)
1750  s->low_delay = 0;
1751  }
1752 
1753  ctx->shape = get_bits(gb, 2); /* vol shape */
1754  if (ctx->shape != RECT_SHAPE)
1755  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1756  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1757  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1758  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1759  }
1760 
1761  check_marker(gb, "before time_increment_resolution");
1762 
1763  s->avctx->framerate.num = get_bits(gb, 16);
1764  if (!s->avctx->framerate.num) {
1765  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1766  return AVERROR_INVALIDDATA;
1767  }
1768 
1769  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1770  if (ctx->time_increment_bits < 1)
1771  ctx->time_increment_bits = 1;
1772 
1773  check_marker(gb, "before fixed_vop_rate");
1774 
1775  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1777  else
1778  s->avctx->framerate.den = 1;
1779 
1780  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1781 
1782  ctx->t_frame = 0;
1783 
1784  if (ctx->shape != BIN_ONLY_SHAPE) {
1785  if (ctx->shape == RECT_SHAPE) {
1786  check_marker(gb, "before width");
1787  width = get_bits(gb, 13);
1788  check_marker(gb, "before height");
1789  height = get_bits(gb, 13);
1790  check_marker(gb, "after height");
1791  if (width && height && /* they should be non zero but who knows */
1792  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1793  if (s->width && s->height &&
1794  (s->width != width || s->height != height))
1795  s->context_reinit = 1;
1796  s->width = width;
1797  s->height = height;
1798  }
1799  }
1800 
1802  s->progressive_frame = get_bits1(gb) ^ 1;
1803  s->interlaced_dct = 0;
1804  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1805  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1806  "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1807  if (vo_ver_id == 1)
1808  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1809  else
1810  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1811 
1812  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1813  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1814  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1815  ctx->vol_sprite_usage == GMC_SPRITE) {
1816  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1817  skip_bits(gb, 13); // sprite_width
1818  skip_bits1(gb); /* marker */
1819  skip_bits(gb, 13); // sprite_height
1820  skip_bits1(gb); /* marker */
1821  skip_bits(gb, 13); // sprite_left
1822  skip_bits1(gb); /* marker */
1823  skip_bits(gb, 13); // sprite_top
1824  skip_bits1(gb); /* marker */
1825  }
1826  ctx->num_sprite_warping_points = get_bits(gb, 6);
1827  if (ctx->num_sprite_warping_points > 3) {
1829  "%d sprite_warping_points\n",
1831  ctx->num_sprite_warping_points = 0;
1832  return AVERROR_INVALIDDATA;
1833  }
1834  s->sprite_warping_accuracy = get_bits(gb, 2);
1836  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1837  skip_bits1(gb); // low_latency_sprite
1838  }
1839  // FIXME sadct disable bit if verid!=1 && shape not rect
1840 
1841  if (get_bits1(gb) == 1) { /* not_8_bit */
1842  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1843  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1844  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1845  if (s->quant_precision != 5)
1847  "quant precision %d\n", s->quant_precision);
1848  if (s->quant_precision<3 || s->quant_precision>9) {
1849  s->quant_precision = 5;
1850  }
1851  } else {
1852  s->quant_precision = 5;
1853  }
1854 
1855  // FIXME a bunch of grayscale shape things
1856 
1857  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1858  int i, v;
1859 
1860  /* load default matrixes */
1861  for (i = 0; i < 64; i++) {
1862  int j = s->idsp.idct_permutation[i];
1864  s->intra_matrix[j] = v;
1865  s->chroma_intra_matrix[j] = v;
1866 
1868  s->inter_matrix[j] = v;
1869  s->chroma_inter_matrix[j] = v;
1870  }
1871 
1872  /* load custom intra matrix */
1873  if (get_bits1(gb)) {
1874  int last = 0;
1875  for (i = 0; i < 64; i++) {
1876  int j;
1877  if (get_bits_left(gb) < 8) {
1878  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1879  return AVERROR_INVALIDDATA;
1880  }
1881  v = get_bits(gb, 8);
1882  if (v == 0)
1883  break;
1884 
1885  last = v;
1887  s->intra_matrix[j] = last;
1888  s->chroma_intra_matrix[j] = last;
1889  }
1890 
1891  /* replicate last value */
1892  for (; i < 64; i++) {
1893  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1894  s->intra_matrix[j] = last;
1895  s->chroma_intra_matrix[j] = last;
1896  }
1897  }
1898 
1899  /* load custom non intra matrix */
1900  if (get_bits1(gb)) {
1901  int last = 0;
1902  for (i = 0; i < 64; i++) {
1903  int j;
1904  if (get_bits_left(gb) < 8) {
1905  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1906  return AVERROR_INVALIDDATA;
1907  }
1908  v = get_bits(gb, 8);
1909  if (v == 0)
1910  break;
1911 
1912  last = v;
1914  s->inter_matrix[j] = v;
1915  s->chroma_inter_matrix[j] = v;
1916  }
1917 
1918  /* replicate last value */
1919  for (; i < 64; i++) {
1920  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1921  s->inter_matrix[j] = last;
1922  s->chroma_inter_matrix[j] = last;
1923  }
1924  }
1925 
1926  // FIXME a bunch of grayscale shape things
1927  }
1928 
1929  if (vo_ver_id != 1)
1930  s->quarter_sample = get_bits1(gb);
1931  else
1932  s->quarter_sample = 0;
1933 
1934  if (get_bits_left(gb) < 4) {
1935  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1936  return AVERROR_INVALIDDATA;
1937  }
1938 
1939  if (!get_bits1(gb)) {
1940  int pos = get_bits_count(gb);
1941  int estimation_method = get_bits(gb, 2);
1942  if (estimation_method < 2) {
1943  if (!get_bits1(gb)) {
1944  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1945  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1946  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1947  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1948  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1949  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1950  }
1951  if (!get_bits1(gb)) {
1952  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1953  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1954  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1955  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1956  }
1957  if (!check_marker(gb, "in complexity estimation part 1")) {
1958  skip_bits_long(gb, pos - get_bits_count(gb));
1959  goto no_cplx_est;
1960  }
1961  if (!get_bits1(gb)) {
1962  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1963  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1964  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1965  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1966  }
1967  if (!get_bits1(gb)) {
1968  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1969  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1970  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1971  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1972  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1973  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1974  }
1975  if (!check_marker(gb, "in complexity estimation part 2")) {
1976  skip_bits_long(gb, pos - get_bits_count(gb));
1977  goto no_cplx_est;
1978  }
1979  if (estimation_method == 1) {
1980  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1981  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1982  }
1983  } else
1985  "Invalid Complexity estimation method %d\n",
1986  estimation_method);
1987  } else {
1988 
1989 no_cplx_est:
1992  ctx->cplx_estimation_trash_b = 0;
1993  }
1994 
1995  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1996 
1997  s->data_partitioning = get_bits1(gb);
1998  if (s->data_partitioning)
1999  ctx->rvlc = get_bits1(gb);
2000 
2001  if (vo_ver_id != 1) {
2002  ctx->new_pred = get_bits1(gb);
2003  if (ctx->new_pred) {
2004  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2005  skip_bits(gb, 2); /* requested upstream message type */
2006  skip_bits1(gb); /* newpred segment type */
2007  }
2008  if (get_bits1(gb)) // reduced_res_vop
2010  "reduced resolution VOP not supported\n");
2011  } else {
2012  ctx->new_pred = 0;
2013  }
2014 
2015  ctx->scalability = get_bits1(gb);
2016 
2017  if (ctx->scalability) {
2018  GetBitContext bak = *gb;
2019  int h_sampling_factor_n;
2020  int h_sampling_factor_m;
2021  int v_sampling_factor_n;
2022  int v_sampling_factor_m;
2023 
2024  skip_bits1(gb); // hierarchy_type
2025  skip_bits(gb, 4); /* ref_layer_id */
2026  skip_bits1(gb); /* ref_layer_sampling_dir */
2027  h_sampling_factor_n = get_bits(gb, 5);
2028  h_sampling_factor_m = get_bits(gb, 5);
2029  v_sampling_factor_n = get_bits(gb, 5);
2030  v_sampling_factor_m = get_bits(gb, 5);
2031  ctx->enhancement_type = get_bits1(gb);
2032 
2033  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2034  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2035  /* illegal scalability header (VERY broken encoder),
2036  * trying to workaround */
2037  ctx->scalability = 0;
2038  *gb = bak;
2039  } else
2040  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2041 
2042  // bin shape stuff FIXME
2043  }
2044  }
2045 
2046  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2047  av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
2048  s->avctx->framerate.den, s->avctx->framerate.num,
2049  ctx->time_increment_bits,
2050  s->quant_precision,
2052  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2053  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2054  );
2055  }
2056 
2057  return 0;
2058 }
2059 
2060 /**
2061  * Decode the user data stuff in the header.
2062  * Also initializes divx/xvid/lavc_version/build.
2063  */
2065 {
2066  MpegEncContext *s = &ctx->m;
2067  char buf[256];
2068  int i;
2069  int e;
2070  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2071  char last;
2072 
2073  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2074  if (show_bits(gb, 23) == 0)
2075  break;
2076  buf[i] = get_bits(gb, 8);
2077  }
2078  buf[i] = 0;
2079 
2080  /* divx detection */
2081  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2082  if (e < 2)
2083  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2084  if (e >= 2) {
2085  ctx->divx_version = ver;
2086  ctx->divx_build = build;
2087  s->divx_packed = e == 3 && last == 'p';
2088  if (s->divx_packed && !ctx->showed_packed_warning) {
2089  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2090  "wasteful way to store B-frames ('packed B-frames'). "
2091  "Consider using a tool like VirtualDub or avidemux to fix it.\n");
2092  ctx->showed_packed_warning = 1;
2093  }
2094  }
2095 
2096  /* libavcodec detection */
2097  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2098  if (e != 4)
2099  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2100  if (e != 4) {
2101  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2102  if (e > 1)
2103  build = (ver << 16) + (ver2 << 8) + ver3;
2104  }
2105  if (e != 4) {
2106  if (strcmp(buf, "ffmpeg") == 0)
2107  ctx->lavc_build = 4600;
2108  }
2109  if (e == 4)
2110  ctx->lavc_build = build;
2111 
2112  /* Xvid detection */
2113  e = sscanf(buf, "XviD%d", &build);
2114  if (e == 1)
2115  ctx->xvid_build = build;
2116 
2117  return 0;
2118 }
2119 
2121 {
2122  Mpeg4DecContext *ctx = avctx->priv_data;
2123  MpegEncContext *s = &ctx->m;
2124 
2125  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2126  if (s->codec_tag == AV_RL32("XVID") ||
2127  s->codec_tag == AV_RL32("XVIX") ||
2128  s->codec_tag == AV_RL32("RMP4") ||
2129  s->codec_tag == AV_RL32("ZMP4") ||
2130  s->codec_tag == AV_RL32("SIPP"))
2131  ctx->xvid_build = 0;
2132  }
2133 
2134  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2135  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2136  ctx->vol_control_parameters == 0)
2137  ctx->divx_version = 400; // divx 4
2138 
2139  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2140  ctx->divx_version =
2141  ctx->divx_build = -1;
2142  }
2143 
2145  if (s->codec_tag == AV_RL32("XVIX"))
2147 
2148  if (s->codec_tag == AV_RL32("UMP4"))
2150 
2151  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2153 
2154  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2156 
2157  if (ctx->xvid_build <= 3U)
2158  s->padding_bug_score = 256 * 256 * 256 * 64;
2159 
2160  if (ctx->xvid_build <= 1U)
2162 
2163  if (ctx->xvid_build <= 12U)
2165 
2166  if (ctx->xvid_build <= 32U)
2168 
2169 #define SET_QPEL_FUNC(postfix1, postfix2) \
2170  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2171  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2172  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2173 
2174  if (ctx->lavc_build < 4653U)
2176 
2177  if (ctx->lavc_build < 4655U)
2179 
2180  if (ctx->lavc_build < 4670U)
2182 
2183  if (ctx->lavc_build <= 4712U)
2185 
2186  if (ctx->divx_version >= 0)
2188  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2189  s->padding_bug_score = 256 * 256 * 256 * 64;
2190 
2191  if (ctx->divx_version < 500U)
2193 
2194  if (ctx->divx_version >= 0)
2196  }
2197 
2198  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2199  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2200  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2201  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2202  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2203  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2204  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2205 
2206  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2207  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2208  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2209  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2210  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2211  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2212  }
2213 
2214  if (avctx->debug & FF_DEBUG_BUGS)
2216  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2217  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2218  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2219 
2220  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2221  s->codec_id == AV_CODEC_ID_MPEG4 &&
2222  avctx->idct_algo == FF_IDCT_AUTO) {
2223  avctx->idct_algo = FF_IDCT_XVID;
2224  ff_mpv_idct_init(s);
2225  return 1;
2226  }
2227 
2228  return 0;
2229 }
2230 
2232 {
2233  MpegEncContext *s = &ctx->m;
2234  int time_incr, time_increment;
2235  int64_t pts;
2236 
2237  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2238  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2239  ctx->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) {
2240  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2241  s->low_delay = 0;
2242  }
2243 
2245  if (s->partitioned_frame)
2247  else
2249 
2250  time_incr = 0;
2251  while (get_bits1(gb) != 0)
2252  time_incr++;
2253 
2254  check_marker(gb, "before time_increment");
2255 
2256  if (ctx->time_increment_bits == 0 ||
2257  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2259  "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
2260 
2261  for (ctx->time_increment_bits = 1;
2262  ctx->time_increment_bits < 16;
2263  ctx->time_increment_bits++) {
2264  if (s->pict_type == AV_PICTURE_TYPE_P ||
2265  (s->pict_type == AV_PICTURE_TYPE_S &&
2266  ctx->vol_sprite_usage == GMC_SPRITE)) {
2267  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2268  break;
2269  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2270  break;
2271  }
2272 
2274  "my guess is %d bits ;)\n", ctx->time_increment_bits);
2275  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2276  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2277  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2278  }
2279  }
2280 
2281  if (IS_3IV1)
2282  time_increment = get_bits1(gb); // FIXME investigate further
2283  else
2284  time_increment = get_bits(gb, ctx->time_increment_bits);
2285 
2286  if (s->pict_type != AV_PICTURE_TYPE_B) {
2287  s->last_time_base = s->time_base;
2288  s->time_base += time_incr;
2289  s->time = s->time_base * s->avctx->framerate.num + time_increment;
2290  if (s->workaround_bugs & FF_BUG_UMP4) {
2291  if (s->time < s->last_non_b_time) {
2292  /* header is not mpeg-4-compatible, broken encoder,
2293  * trying to workaround */
2294  s->time_base++;
2295  s->time += s->avctx->framerate.num;
2296  }
2297  }
2298  s->pp_time = s->time - s->last_non_b_time;
2299  s->last_non_b_time = s->time;
2300  } else {
2301  s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2302  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2303  if (s->pp_time <= s->pb_time ||
2304  s->pp_time <= s->pp_time - s->pb_time ||
2305  s->pp_time <= 0) {
2306  /* messed up order, maybe after seeking? skipping current b-frame */
2307  return FRAME_SKIPPED;
2308  }
2310 
2311  if (ctx->t_frame == 0)
2312  ctx->t_frame = s->pb_time;
2313  if (ctx->t_frame == 0)
2314  ctx->t_frame = 1; // 1/0 protection
2316  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2317  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2318  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2319  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2320  s->pb_field_time = 2;
2321  s->pp_field_time = 4;
2322  if (!s->progressive_sequence)
2323  return FRAME_SKIPPED;
2324  }
2325  }
2326 
2327  if (s->avctx->framerate.den)
2328  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2329  else
2330  pts = AV_NOPTS_VALUE;
2331  if (s->avctx->debug&FF_DEBUG_PTS)
2332  av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
2333  pts);
2334 
2335  check_marker(gb, "before vop_coded");
2336 
2337  /* vop coded */
2338  if (get_bits1(gb) != 1) {
2339  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2340  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2341  return FRAME_SKIPPED;
2342  }
2343  if (ctx->new_pred)
2344  decode_new_pred(ctx, gb);
2345 
2346  if (ctx->shape != BIN_ONLY_SHAPE &&
2347  (s->pict_type == AV_PICTURE_TYPE_P ||
2348  (s->pict_type == AV_PICTURE_TYPE_S &&
2349  ctx->vol_sprite_usage == GMC_SPRITE))) {
2350  /* rounding type for motion estimation */
2351  s->no_rounding = get_bits1(gb);
2352  } else {
2353  s->no_rounding = 0;
2354  }
2355  // FIXME reduced res stuff
2356 
2357  if (ctx->shape != RECT_SHAPE) {
2358  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2359  skip_bits(gb, 13); /* width */
2360  skip_bits1(gb); /* marker */
2361  skip_bits(gb, 13); /* height */
2362  skip_bits1(gb); /* marker */
2363  skip_bits(gb, 13); /* hor_spat_ref */
2364  skip_bits1(gb); /* marker */
2365  skip_bits(gb, 13); /* ver_spat_ref */
2366  }
2367  skip_bits1(gb); /* change_CR_disable */
2368 
2369  if (get_bits1(gb) != 0)
2370  skip_bits(gb, 8); /* constant_alpha_value */
2371  }
2372 
2373  // FIXME complexity estimation stuff
2374 
2375  if (ctx->shape != BIN_ONLY_SHAPE) {
2377  if (s->pict_type != AV_PICTURE_TYPE_I)
2379  if (s->pict_type == AV_PICTURE_TYPE_B)
2381 
2382  if (get_bits_left(gb) < 3) {
2383  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2384  return AVERROR_INVALIDDATA;
2385  }
2387  if (!s->progressive_sequence) {
2388  s->top_field_first = get_bits1(gb);
2389  s->alternate_scan = get_bits1(gb);
2390  } else
2391  s->alternate_scan = 0;
2392  }
2393 
2394  if (s->alternate_scan) {
2399  } else {
2404  }
2405 
2406  if (s->pict_type == AV_PICTURE_TYPE_S &&
2407  (ctx->vol_sprite_usage == STATIC_SPRITE ||
2408  ctx->vol_sprite_usage == GMC_SPRITE)) {
2409  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2410  return AVERROR_INVALIDDATA;
2411  if (ctx->sprite_brightness_change)
2413  "sprite_brightness_change not supported\n");
2414  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2415  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2416  }
2417 
2418  if (ctx->shape != BIN_ONLY_SHAPE) {
2419  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2420  if (s->qscale == 0) {
2422  "Error, header damaged or not MPEG4 header (qscale=0)\n");
2423  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2424  }
2425 
2426  if (s->pict_type != AV_PICTURE_TYPE_I) {
2427  s->f_code = get_bits(gb, 3); /* fcode_for */
2428  if (s->f_code == 0) {
2430  "Error, header damaged or not MPEG4 header (f_code=0)\n");
2431  s->f_code = 1;
2432  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2433  }
2434  } else
2435  s->f_code = 1;
2436 
2437  if (s->pict_type == AV_PICTURE_TYPE_B) {
2438  s->b_code = get_bits(gb, 3);
2439  if (s->b_code == 0) {
2441  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2442  s->b_code=1;
2443  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2444  }
2445  } else
2446  s->b_code = 1;
2447 
2448  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2450  "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 time:%"PRId64" tincr:%d\n",
2451  s->qscale, s->f_code, s->b_code,
2452  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")),
2454  s->top_field_first, s->quarter_sample ? "q" : "h",
2457  1 - s->no_rounding, s->vo_type,
2458  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2461  s->time,
2462  time_increment
2463  );
2464  }
2465 
2466  if (!ctx->scalability) {
2467  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2468  skip_bits1(gb); // vop shape coding type
2469  } else {
2470  if (ctx->enhancement_type) {
2471  int load_backward_shape = get_bits1(gb);
2472  if (load_backward_shape)
2474  "load backward shape isn't supported\n");
2475  }
2476  skip_bits(gb, 2); // ref_select_code
2477  }
2478  }
2479  /* detect buggy encoders which don't set the low_delay flag
2480  * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2481  * easily (although it's buggy too) */
2482  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2483  ctx->divx_version == -1 && s->picture_number == 0) {
2485  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2486  s->low_delay = 1;
2487  }
2488 
2489  s->picture_number++; // better than pic number==0 always ;)
2490 
2491  // FIXME add short header support
2494 
2495  if (s->workaround_bugs & FF_BUG_EDGE) {
2496  s->h_edge_pos = s->width;
2497  s->v_edge_pos = s->height;
2498  }
2499  return 0;
2500 }
2501 
2502 /**
2503  * Decode mpeg4 headers.
2504  * @return <0 if no VOP found (or a damaged one)
2505  * FRAME_SKIPPED if a not coded VOP is found
2506  * 0 if a VOP is found
2507  */
2509 {
2510  MpegEncContext *s = &ctx->m;
2511  unsigned startcode, v;
2512  int ret;
2513 
2514  /* search next start code */
2515  align_get_bits(gb);
2516 
2517  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2518  skip_bits(gb, 24);
2519  if (get_bits(gb, 8) == 0xF0)
2520  goto end;
2521  }
2522 
2523  startcode = 0xff;
2524  for (;;) {
2525  if (get_bits_count(gb) >= gb->size_in_bits) {
2526  if (gb->size_in_bits == 8 &&
2527  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2528  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2529  return FRAME_SKIPPED; // divx bug
2530  } else
2531  return -1; // end of stream
2532  }
2533 
2534  /* use the bits after the test */
2535  v = get_bits(gb, 8);
2536  startcode = ((startcode << 8) | v) & 0xffffffff;
2537 
2538  if ((startcode & 0xFFFFFF00) != 0x100)
2539  continue; // no startcode
2540 
2541  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2542  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2543  if (startcode <= 0x11F)
2544  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2545  else if (startcode <= 0x12F)
2546  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2547  else if (startcode <= 0x13F)
2548  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2549  else if (startcode <= 0x15F)
2550  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2551  else if (startcode <= 0x1AF)
2552  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2553  else if (startcode == 0x1B0)
2554  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2555  else if (startcode == 0x1B1)
2556  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2557  else if (startcode == 0x1B2)
2558  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2559  else if (startcode == 0x1B3)
2560  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2561  else if (startcode == 0x1B4)
2562  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2563  else if (startcode == 0x1B5)
2564  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2565  else if (startcode == 0x1B6)
2566  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2567  else if (startcode == 0x1B7)
2568  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2569  else if (startcode == 0x1B8)
2570  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2571  else if (startcode == 0x1B9)
2572  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2573  else if (startcode == 0x1BA)
2574  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2575  else if (startcode == 0x1BB)
2576  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2577  else if (startcode == 0x1BC)
2578  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2579  else if (startcode == 0x1BD)
2580  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2581  else if (startcode == 0x1BE)
2582  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2583  else if (startcode == 0x1BF)
2584  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2585  else if (startcode == 0x1C0)
2586  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2587  else if (startcode == 0x1C1)
2588  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2589  else if (startcode == 0x1C2)
2590  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2591  else if (startcode == 0x1C3)
2592  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2593  else if (startcode <= 0x1C5)
2594  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2595  else if (startcode <= 0x1FF)
2596  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2597  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2598  }
2599 
2600  if (startcode >= 0x120 && startcode <= 0x12F) {
2601  if ((ret = decode_vol_header(ctx, gb)) < 0)
2602  return ret;
2603  } else if (startcode == USER_DATA_STARTCODE) {
2604  decode_user_data(ctx, gb);
2605  } else if (startcode == GOP_STARTCODE) {
2606  mpeg4_decode_gop_header(s, gb);
2607  } else if (startcode == VOS_STARTCODE) {
2609  } else if (startcode == VOP_STARTCODE) {
2610  break;
2611  }
2612 
2613  align_get_bits(gb);
2614  startcode = 0xff;
2615  }
2616 
2617 end:
2618  if (s->flags & CODEC_FLAG_LOW_DELAY)
2619  s->low_delay = 1;
2620  s->avctx->has_b_frames = !s->low_delay;
2621 
2622  return decode_vop_header(ctx, gb);
2623 }
2624 
2626  static int done = 0;
2627 
2628  if (!done) {
2635  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2636  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2637  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2638  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2639  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2640  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2641  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2642  &ff_sprite_trajectory_tab[0][1], 4, 2,
2643  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2644  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2645  &ff_mb_type_b_tab[0][1], 2, 1,
2646  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2647  done = 1;
2648  }
2649 }
2650 
2651 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2652 {
2653  Mpeg4DecContext *ctx = avctx->priv_data;
2654  MpegEncContext *s = &ctx->m;
2655 
2656  /* divx 5.01+ bitstream reorder stuff */
2657  /* Since this clobbers the input buffer and hwaccel codecs still need the
2658  * data during hwaccel->end_frame we should not do this any earlier */
2659  if (s->divx_packed) {
2660  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2661  int startcode_found = 0;
2662 
2663  if (buf_size - current_pos > 7) {
2664 
2665  int i;
2666  for (i = current_pos; i < buf_size - 4; i++)
2667 
2668  if (buf[i] == 0 &&
2669  buf[i + 1] == 0 &&
2670  buf[i + 2] == 1 &&
2671  buf[i + 3] == 0xB6) {
2672  startcode_found = !(buf[i + 4] & 0x40);
2673  break;
2674  }
2675  }
2676 
2677  if (startcode_found) {
2680  buf_size - current_pos);
2681  if (!s->bitstream_buffer)
2682  return AVERROR(ENOMEM);
2683  memcpy(s->bitstream_buffer, buf + current_pos,
2684  buf_size - current_pos);
2685  s->bitstream_buffer_size = buf_size - current_pos;
2686  }
2687  }
2688 
2689  return 0;
2690 }
2691 
2693  const AVCodecContext *src)
2694 {
2695  Mpeg4DecContext *s = dst->priv_data;
2696  const Mpeg4DecContext *s1 = src->priv_data;
2697  int init = s->m.context_initialized;
2698 
2699  int ret = ff_mpeg_update_thread_context(dst, src);
2700 
2701  if (ret < 0)
2702  return ret;
2703 
2704  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2705 
2706  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2707  ff_xvid_idct_init(&s->m.idsp, dst);
2708 
2709  return 0;
2710 }
2711 
2713 {
2714  Mpeg4DecContext *ctx = avctx->priv_data;
2715  MpegEncContext *s = &ctx->m;
2716  int ret;
2717 
2718  ctx->divx_version =
2719  ctx->divx_build =
2720  ctx->xvid_build =
2721  ctx->lavc_build = -1;
2722 
2723  if ((ret = ff_h263_decode_init(avctx)) < 0)
2724  return ret;
2725 
2727 
2728  s->h263_pred = 1;
2729  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2731  ctx->time_increment_bits = 4; /* default value for broken headers */
2732 
2734  avctx->internal->allocate_progress = 1;
2735 
2736  return 0;
2737 }
2738 
2740  { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2741  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2742  { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2743  { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2744  { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2745  { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2746  { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2747  { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2748  { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2749  { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2750  { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2751  { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2752  { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2753  { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2754  { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2755  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2756  { FF_PROFILE_UNKNOWN },
2757 };
2758 
2759 static const AVOption mpeg4_options[] = {
2760  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2761  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2762  {NULL}
2763 };
2764 
2765 static const AVClass mpeg4_class = {
2766  "MPEG4 Video Decoder",
2768  mpeg4_options,
2770 };
2771 
2773  .name = "mpeg4",
2774  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2775  .type = AVMEDIA_TYPE_VIDEO,
2776  .id = AV_CODEC_ID_MPEG4,
2777  .priv_data_size = sizeof(Mpeg4DecContext),
2778  .init = decode_init,
2779  .close = ff_h263_decode_end,
2781  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2784  .flush = ff_mpeg_flush,
2785  .max_lowres = 3,
2786  .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2787  .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2788  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2789  .priv_class = &mpeg4_class,
2790 };
2791 
2792 
2793 #if CONFIG_MPEG4_VDPAU_DECODER
2794 static const AVClass mpeg4_vdpau_class = {
2795  "MPEG4 Video VDPAU Decoder",
2797  mpeg4_options,
2799 };
2800 
2801 AVCodec ff_mpeg4_vdpau_decoder = {
2802  .name = "mpeg4_vdpau",
2803  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2804  .type = AVMEDIA_TYPE_VIDEO,
2805  .id = AV_CODEC_ID_MPEG4,
2806  .priv_data_size = sizeof(Mpeg4DecContext),
2807  .init = decode_init,
2808  .close = ff_h263_decode_end,
2810  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2812  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2813  AV_PIX_FMT_NONE },
2814  .priv_class = &mpeg4_vdpau_class,
2815 };
2816 #endif
#define FF_PROFILE_MPEG4_SCALABLE_TEXTURE
Definition: avcodec.h:2888
int last_time_base
Definition: mpegvideo.h:520
int bitstream_buffer_size
Definition: mpegvideo.h:548
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:383
uint16_t sprite_traj[4][2]
sprite trajectory points
Definition: mpeg4video.h:72
IDCTDSPContext idsp
Definition: mpegvideo.h:367
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3015
#define MB_TYPE_SKIP
Definition: avcodec.h:903
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:3378
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
float v
int aspect_ratio_info
Definition: mpegvideo.h:534
int picture_number
Definition: mpegvideo.h:262
const char * s
Definition: avisynth_c.h:669
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ScanTable intra_v_scantable
Definition: mpegvideo.h:225
static int shift(int a, int b)
Definition: sonic.c:82
S(GMC)-VOP MPEG4.
Definition: avutil.h:270
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:528
#define FF_PROFILE_MPEG4_ADVANCED_CORE
Definition: avcodec.h:2895
#define CBPY_VLC_BITS
Definition: h263.h:40
int sprite_brightness_change
Definition: mpeg4video.h:69
#define GET_RL_VLC
Definition: get_bits.h:693
AVOption.
Definition: opt.h:255
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:404
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:323
#define FF_PROFILE_MPEG4_MAIN
Definition: avcodec.h:2886
int sprite_warping_accuracy
Definition: mpegvideo.h:535
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG1 & B-frame MPEG4
Definition: mpegvideo.h:413
av_cold void ff_mpeg4videodec_static_init(void)
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:633
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:181
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideo.c:111
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:217
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:42
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:93
int resync_marker
could this stream contain resync markers
Definition: mpeg4video.h:79
#define CODEC_CAP_TRUNCATED
Definition: avcodec.h:788
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:436
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 mpeg4 AC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:329
int v_edge_pos
horizontal / vertical position of the right/bottom edge (pixel replication)
Definition: mpegvideo.h:267
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:95
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:180
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:438
#define FF_PROFILE_MPEG4_ADVANCED_SIMPLE
Definition: avcodec.h:2898
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
int num
numerator
Definition: rational.h:44
uint8_t * bitstream_buffer
Definition: mpegvideo.h:547
enum AVCodecID codec_id
Definition: mpegvideo.h:244
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2626
const uint8_t * buffer
Definition: get_bits.h:55
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:60
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:1621
static av_cold int decode_init(AVCodecContext *avctx)
#define MB_TYPE_INTRA
Definition: mpegutils.h:69
#define FF_PROFILE_MPEG4_N_BIT
Definition: avcodec.h:2887
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional FF_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:139
int real_sprite_warping_points
Definition: mpegvideo.h:528
mpegvideo header.
#define DC_VLC_BITS
Definition: mpeg4videodec.c:41
#define DC_MARKER
Definition: mpeg4video.h:54
uint8_t permutated[64]
Definition: idctdsp.h:31
uint8_t run
Definition: svq3.c:149
#define ER_MV_ERROR
int padding_bug_score
used to detect the VERY common padding bug in MPEG4
Definition: mpegvideo.h:543
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:630
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:268
int profile
profile
Definition: avcodec.h:2833
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2520
AVCodec.
Definition: avcodec.h:3173
int time_base
time in seconds of last I,P,S Frame
Definition: mpegvideo.h:521
RLTable.
Definition: rl.h:38
int qscale
QP.
Definition: mpegvideo.h:341
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:412
int block_wrap[6]
Definition: mpegvideo.h:429
int quant_precision
Definition: mpegvideo.h:532
int cplx_estimation_trash_b
Definition: mpeg4video.h:104
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:3072
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1367
int vol_sprite_usage
Definition: mpeg4video.h:68
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
#define USES_LIST(a, list)
Definition: mpegutils.h:95
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:2521
#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:493
int64_t time
time of current frame
Definition: mpegvideo.h:522
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:46
#define FF_BUG_UMP4
Definition: avcodec.h:2513
int context_reinit
Definition: mpegvideo.h:677
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4) ...
Definition: mpegvideo.h:399
if()
Definition: avfilter.c:975
uint8_t bits
Definition: crc.c:295
uint8_t
#define av_cold
Definition: attributes.h:74
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:63
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
float delta
AVOptions.
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:476
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
const uint16_t ff_sprite_trajectory_tab[15][2]
Definition: mpeg4data.h:326
#define VOP_STARTCODE
Definition: mpeg4video.h:60
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:67
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
#define IS_3IV1
Definition: mpeg4video.h:168
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:335
Multithreading support functions.
#define CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:832
#define FF_PROFILE_UNKNOWN
Definition: avcodec.h:2834
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:419
int enhancement_type
Definition: mpeg4video.h:84
int interlaced_dct
Definition: mpegvideo.h:611
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:315
#define CHROMA_420
Definition: mpegvideo.h:603
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:787
int cplx_estimation_trash_p
Definition: mpeg4video.h:103
#define RECT_SHAPE
Definition: mpeg4video.h:33
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2514
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:524
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:191
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:427
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:264
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:254
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:89
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1965
#define MAX_LEVEL
Definition: rl.h:35
#define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE
Definition: avcodec.h:2890
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:178
#define av_log(a,...)
#define MOTION_MARKER
Definition: mpeg4video.h:53
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:821
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:3470
MpegEncContext m
Definition: mpeg4video.h:63
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:529
#define ROUNDED_DIV(a, b)
Definition: common.h:55
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2519
ThreadFrame tf
Definition: mpegvideo.h:105
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2623
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333
#define U(x)
Definition: vp56_arith.h:37
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2522
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:588
int16_t * dc_val[3]
used for mpeg4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:322
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:173
static double alpha(void *priv, double x, double y)
Definition: vf_geq.c:98
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:175
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1531
uint8_t * mbskip_table
Definition: mpegvideo.h:117
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:330
#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:822
av_default_item_name
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:537
#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:180
ERContext er
Definition: mpegvideo.h:679
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
const char * r
Definition: vf_curves.c:107
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:196
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:39
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2508
#define FF_DEBUG_PTS
Definition: avcodec.h:2579
GLsizei GLsizei * length
Definition: opengl_enc.c:115
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:81
const char * name
Name of the codec implementation.
Definition: avcodec.h:3180
#define IS_SKIP(a)
Definition: mpegutils.h:77
#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE
Definition: avcodec.h:2884
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:533
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:538
#define SET_QPEL_FUNC(postfix1, postfix2)
GetBitContext gb
Definition: mpegvideo.h:578
#define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME
Definition: avcodec.h:2892
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:629
#define CLOSE_READER(name, gb)
Definition: get_bits.h:144
#define FF_PROFILE_MPEG4_HYBRID
Definition: avcodec.h:2891
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:58
#define CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:755
static int check_marker(GetBitContext *s, const char *msg)
Definition: get_bits.h:393
Definition: get_bits.h:63
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:3439
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:188
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:219
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:490
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:54
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2577
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:530
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:902
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideo.c:122
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:94
int err_recognition
Definition: mpegvideo.h:495
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:401
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
int progressive_frame
Definition: mpegvideo.h:609
#define CONFIG_MPEG4_DECODER
Definition: config.h:672
int top_field_first
Definition: mpegvideo.h:594
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:48
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2610
#define FF_PROFILE_MPEG4_SIMPLE
Definition: avcodec.h:2883
#define CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:781
#define MB_TYPE_DIRECT2
Definition: avcodec.h:900
#define FFMIN(a, b)
Definition: common.h:81
float y
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:44
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
ret
Definition: avfilter.c:974
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2683
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
#define MB_TYPE_INTERLACED
Definition: avcodec.h:899
int16_t(*[2] motion_val)[2]
Definition: mpegvideo.h:111
#define GRAY_SHAPE
Definition: mpeg4video.h:36
#define ER_DC_END
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:714
int alternate_scan
Definition: mpegvideo.h:598
AVCodec ff_mpeg4_decoder
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:549
int size_in_bits
Definition: get_bits.h:57
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:287
#define MB_TYPE_L0L1
Definition: avcodec.h:910
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:68
int level
level
Definition: avcodec.h:2917
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:194
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:555
#define AV_RL32
Definition: intreadwrite.h:146
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:218
int n
Definition: avisynth_c.h:589
#define MB_TYPE_ACPRED
Definition: avcodec.h:901
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
#define MB_TYPE_L1
Definition: avcodec.h:909
int vol_control_parameters
does the stream contain the low_delay flag, used to work around buggy encoders.
Definition: mpeg4video.h:101
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:333
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:945
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:47
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:206
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:40
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:428
static void flush(AVCodecContext *avctx)
Definition: aacdec.c:502
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:401
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:566
#define FF_IDCT_AUTO
Definition: avcodec.h:2684
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
decode partition C of one MB.
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:398
#define FF_PROFILE_MPEG4_CORE
Definition: avcodec.h:2885
#define AV_LOG_INFO
Standard information.
Definition: log.h:186
uint16_t inter_matrix[64]
Definition: mpegvideo.h:437
int64_t last_non_b_time
Definition: mpegvideo.h:523
AVS_Value src
Definition: avisynth_c.h:524
BlockDSPContext bdsp
Definition: mpegvideo.h:363
int debug
debug
Definition: avcodec.h:2563
main external API structure.
Definition: avcodec.h:1239
int cplx_estimation_trash_i
Definition: mpeg4video.h:102
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define FASTDIV(a, b)
Definition: mathops.h:211
#define RSHIFT(a, b)
Definition: common.h:53
ScanTable intra_scantable
Definition: mpegvideo.h:223
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:232
static int get_xbits(GetBitContext *s, int n)
read mpeg1 dc style vlc (sign bit + mantissa with no MSB).
Definition: get_bits.h:231
#define OPEN_READER(name, gb)
Definition: get_bits.h:133
#define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE
Definition: avcodec.h:2896
void * buf
Definition: avisynth_c.h:595
MPEG4 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstre...
Definition: pixfmt.h:140
#define SLICE_END
end marker found
Definition: mpegvideo.h:632
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:536
int showed_packed_warning
flag for having shown the warning about invalid Divx B-frames
Definition: mpeg4video.h:98
int progressive_sequence
Definition: mpegvideo.h:586
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
BYTE int const BYTE int int int height
Definition: avisynth_c.h:714
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:329
static int mpeg4_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Describe the class of an AVClass context structure.
Definition: log.h:66
ScanTable intra_h_scantable
Definition: mpegvideo.h:224
static const AVProfile profiles[]
Definition: aacdec.c:3518
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:297
static const AVProfile mpeg4_video_profiles[]
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:334
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2512
rational number numerator/denominator
Definition: rational.h:43
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode mpeg4 headers.
int context_initialized
Definition: mpegvideo.h:259
#define GET_CACHE(name, gb)
Definition: get_bits.h:210
#define MB_TYPE_16x16
Definition: avcodec.h:895
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2525
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:117
#define s1
Definition: regdef.h:38
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:175
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:89
int f_code
forward MV resolution
Definition: mpegvideo.h:375
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:337
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:127
#define FF_IDCT_XVID
Definition: avcodec.h:2697
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:74
#define MV_DIR_FORWARD
Definition: mpegvideo.h:397
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:349
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:237
static int64_t pts
Global timestamp for the audio frames.
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2524
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:133
uint16_t pb_field_time
like above, just for interlaced
Definition: mpegvideo.h:527
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:324
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1425
uint8_t level
Definition: svq3.c:150
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2564
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:411
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:266
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
#define FF_BUG_AMV
Definition: avcodec.h:2515
MpegEncContext.
Definition: mpegvideo.h:213
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:318
int8_t * qscale_table
Definition: mpegvideo.h:108
#define MAX_RUN
Definition: rl.h:34
struct AVCodecContext * avctx
Definition: mpegvideo.h:230
uint16_t pp_field_time
Definition: mpegvideo.h:526
static int mpeg4_is_resync(Mpeg4DecContext *ctx)
check if the next stuff is a resync marker or the end.
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:520
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:207
static VLC sprite_trajectory
Definition: mpeg4videodec.c:45
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
int t_frame
time distance of first I -> B, used for interlaced B-frames
Definition: mpeg4video.h:81
#define tprintf(p,...)
Definition: get_bits.h:692
static const AVOption mpeg4_options[]
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:265
#define CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:864
#define TEX_VLC_BITS
Definition: dv.h:93
static VLC dc_chrom
Definition: mpeg4videodec.c:44
#define MB_TYPE_8x8
Definition: avcodec.h:898
Bi-dir predicted.
Definition: avutil.h:269
AVProfile.
Definition: avcodec.h:3161
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2619
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:46
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:896
static const AVClass mpeg4_class
#define IS_INTRA(x, y)
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:141
void * priv_data
Definition: avcodec.h:1281
float re
Definition: fft-test.c:73
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
#define IS_8X8(a)
Definition: mpegutils.h:85
int len
#define av_log2
Definition: intmath.h:105
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1289
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:491
av_cold void ff_init_rl(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: mpegvideo.c:1659
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:627
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
#define FF_DEBUG_BUGS
Definition: avcodec.h:2583
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:303
#define IS_ACPRED(a)
Definition: mpegutils.h:90
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2625
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:449
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
int chroma_qscale
chroma QP
Definition: mpegvideo.h:342
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:249
#define av_uninit(x)
Definition: attributes.h:141
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO
Definition: avcodec.h:2897
int flags
AVCodecContext.flags (HQ, MV4, ...)
Definition: mpegvideo.h:247
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:435
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegvideo.h:114
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:253
ScanTable inter_scantable
if inter == intra then intra should be used to reduce tha cache usage
Definition: mpegvideo.h:222
#define FRAME_SKIPPED
return value for header parsers if frame is not coded
Definition: mpegvideo.h:58
#define FF_PROFILE_MPEG4_ADVANCED_CODING
Definition: avcodec.h:2894
int num_sprite_warping_points
Definition: mpeg4video.h:70
#define stride
#define MV_TYPE_8X8
4 vectors (h263, mpeg4 4MV)
Definition: mpegvideo.h:402
int b_code
backward MV resolution for B Frames (mpeg4)
Definition: mpegvideo.h:376
#define FF_BUG_EDGE
Definition: avcodec.h:2523
#define FF_PROFILE_MPEG4_CORE_SCALABLE
Definition: avcodec.h:2893
AVPixelFormat
Pixel format.
Definition: pixfmt.h:66
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.
for(j=16;j >0;--j)
#define MB_TYPE_L0
Definition: avcodec.h:908
#define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION
Definition: avcodec.h:2889
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:241
Predicted.
Definition: avutil.h:268
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:38
#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:525
static int width
#define GMC_SPRITE
Definition: mpeg4video.h:51
static int16_t block[64]
Definition: dct-test.c:110