FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mpeg4videodec.c
Go to the documentation of this file.
1 /*
2  * MPEG-4 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/internal.h"
26 #include "libavutil/opt.h"
27 #include "error_resilience.h"
28 #include "idctdsp.h"
29 #include "internal.h"
30 #include "mpegutils.h"
31 #include "mpegvideo.h"
32 #include "mpegvideodata.h"
33 #include "mpeg4video.h"
34 #include "h263.h"
35 #include "profiles.h"
36 #include "thread.h"
37 #include "xvididct.h"
38 
39 /* The defines below define the number of bits that are read at once for
40  * reading vlc values. Changing these may improve speed and data cache needs
41  * be aware though that decreasing them may need the number of stages that is
42  * passed to get_vlc* to be increased. */
43 #define SPRITE_TRAJ_VLC_BITS 6
44 #define DC_VLC_BITS 9
45 #define MB_TYPE_B_VLC_BITS 4
46 
50 
51 static const int mb_type_b_map[4] = {
56 };
57 
58 /**
59  * Predict the ac.
60  * @param n block index (0-3 are luma, 4-5 are chroma)
61  * @param dir the ac prediction direction
62  */
63 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
64 {
65  int i;
66  int16_t *ac_val, *ac_val1;
67  int8_t *const qscale_table = s->current_picture.qscale_table;
68 
69  /* find prediction */
70  ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
71  ac_val1 = ac_val;
72  if (s->ac_pred) {
73  if (dir == 0) {
74  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
75  /* left prediction */
76  ac_val -= 16;
77 
78  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
79  n == 1 || n == 3) {
80  /* same qscale */
81  for (i = 1; i < 8; i++)
82  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
83  } else {
84  /* different qscale, we must rescale */
85  for (i = 1; i < 8; i++)
86  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
87  }
88  } else {
89  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
90  /* top prediction */
91  ac_val -= 16 * s->block_wrap[n];
92 
93  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
94  n == 2 || n == 3) {
95  /* same qscale */
96  for (i = 1; i < 8; i++)
97  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
98  } else {
99  /* different qscale, we must rescale */
100  for (i = 1; i < 8; i++)
101  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
102  }
103  }
104  }
105  /* left copy */
106  for (i = 1; i < 8; i++)
107  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
108 
109  /* top copy */
110  for (i = 1; i < 8; i++)
111  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
112 }
113 
114 /**
115  * check if the next stuff is a resync marker or the end.
116  * @return 0 if not
117  */
119 {
120  MpegEncContext *s = &ctx->m;
121  int bits_count = get_bits_count(&s->gb);
122  int v = show_bits(&s->gb, 16);
123 
125  return 0;
126 
127  while (v <= 0xFF) {
128  if (s->pict_type == AV_PICTURE_TYPE_B ||
129  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
130  break;
131  skip_bits(&s->gb, 8 + s->pict_type);
132  bits_count += 8 + s->pict_type;
133  v = show_bits(&s->gb, 16);
134  }
135 
136  if (bits_count + 8 >= s->gb.size_in_bits) {
137  v >>= 8;
138  v |= 0x7F >> (7 - (bits_count & 7));
139 
140  if (v == 0x7F)
141  return s->mb_num;
142  } else {
143  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
144  int len, mb_num;
145  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
146  GetBitContext gb = s->gb;
147 
148  skip_bits(&s->gb, 1);
149  align_get_bits(&s->gb);
150 
151  for (len = 0; len < 32; len++)
152  if (get_bits1(&s->gb))
153  break;
154 
155  mb_num = get_bits(&s->gb, mb_num_bits);
156  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
157  mb_num= -1;
158 
159  s->gb = gb;
160 
162  return mb_num;
163  }
164  }
165  return 0;
166 }
167 
169 {
170  MpegEncContext *s = &ctx->m;
171  int a = 2 << s->sprite_warping_accuracy;
172  int rho = 3 - s->sprite_warping_accuracy;
173  int r = 16 / a;
174  int alpha = 0;
175  int beta = 0;
176  int w = s->width;
177  int h = s->height;
178  int min_ab, i, w2, h2, w3, h3;
179  int sprite_ref[4][2];
180  int virtual_ref[2][2];
181 
182  // only true for rectangle shapes
183  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
184  { 0, s->height }, { s->width, s->height } };
185  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
186 
187  if (w <= 0 || h <= 0)
188  return AVERROR_INVALIDDATA;
189 
190  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
191  int length;
192  int x = 0, y = 0;
193 
194  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
195  if (length > 0)
196  x = get_xbits(gb, length);
197 
198  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
199  check_marker(s->avctx, gb, "before sprite_trajectory");
200 
201  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
202  if (length > 0)
203  y = get_xbits(gb, length);
204 
205  check_marker(s->avctx, gb, "after sprite_trajectory");
206  ctx->sprite_traj[i][0] = d[i][0] = x;
207  ctx->sprite_traj[i][1] = d[i][1] = y;
208  }
209  for (; i < 4; i++)
210  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
211 
212  while ((1 << alpha) < w)
213  alpha++;
214  while ((1 << beta) < h)
215  beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
216  w2 = 1 << alpha;
217  h2 = 1 << beta;
218 
219  // Note, the 4th point isn't used for GMC
220  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
221  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
222  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
223  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
224  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
225  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
226  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
227  } else {
228  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
229  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
230  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
231  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
232  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
233  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
234  }
235  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
236  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
237 
238  /* This is mostly identical to the MPEG-4 std (and is totally unreadable
239  * because of that...). Perhaps it should be reordered to be more readable.
240  * The idea behind this virtual_ref mess is to be able to use shifts later
241  * per pixel instead of divides so the distance between points is converted
242  * from w&h based to w2&h2 based which are of the 2^x form. */
243  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
244  ROUNDED_DIV(((w - w2) *
245  (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
246  w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
247  virtual_ref[0][1] = 16 * vop_ref[0][1] +
248  ROUNDED_DIV(((w - w2) *
249  (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
250  w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
251  virtual_ref[1][0] = 16 * vop_ref[0][0] +
252  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
253  h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
254  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
255  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
256  h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
257 
258  switch (ctx->num_sprite_warping_points) {
259  case 0:
260  s->sprite_offset[0][0] =
261  s->sprite_offset[0][1] =
262  s->sprite_offset[1][0] =
263  s->sprite_offset[1][1] = 0;
264  s->sprite_delta[0][0] = a;
265  s->sprite_delta[0][1] =
266  s->sprite_delta[1][0] = 0;
267  s->sprite_delta[1][1] = a;
268  ctx->sprite_shift[0] =
269  ctx->sprite_shift[1] = 0;
270  break;
271  case 1: // GMC only
272  s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
273  s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
274  s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
275  a * (vop_ref[0][0] / 2);
276  s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
277  a * (vop_ref[0][1] / 2);
278  s->sprite_delta[0][0] = a;
279  s->sprite_delta[0][1] =
280  s->sprite_delta[1][0] = 0;
281  s->sprite_delta[1][1] = a;
282  ctx->sprite_shift[0] =
283  ctx->sprite_shift[1] = 0;
284  break;
285  case 2:
286  s->sprite_offset[0][0] = (sprite_ref[0][0] * (1 << alpha + rho)) +
287  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
288  (-vop_ref[0][0]) +
289  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
290  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
291  s->sprite_offset[0][1] = (sprite_ref[0][1] * (1 << alpha + rho)) +
292  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
293  (-vop_ref[0][0]) +
294  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
295  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
296  s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
297  (-2 * vop_ref[0][0] + 1) +
298  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
299  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
300  sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
301  s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
302  (-2 * vop_ref[0][0] + 1) +
303  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
304  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
305  sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
306  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
307  s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
308  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
309  s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
310 
311  ctx->sprite_shift[0] = alpha + rho;
312  ctx->sprite_shift[1] = alpha + rho + 2;
313  break;
314  case 3:
315  min_ab = FFMIN(alpha, beta);
316  w3 = w2 >> min_ab;
317  h3 = h2 >> min_ab;
318  s->sprite_offset[0][0] = (sprite_ref[0][0] * (1<<(alpha + beta + rho - min_ab))) +
319  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
320  h3 * (-vop_ref[0][0]) +
321  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
322  w3 * (-vop_ref[0][1]) +
323  (1 << (alpha + beta + rho - min_ab - 1));
324  s->sprite_offset[0][1] = (sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
325  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
326  h3 * (-vop_ref[0][0]) +
327  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
328  w3 * (-vop_ref[0][1]) +
329  (1 << (alpha + beta + rho - min_ab - 1));
330  s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
331  h3 * (-2 * vop_ref[0][0] + 1) +
332  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
333  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
334  r * sprite_ref[0][0] - 16 * w2 * h3 +
335  (1 << (alpha + beta + rho - min_ab + 1));
336  s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
337  h3 * (-2 * vop_ref[0][0] + 1) +
338  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
339  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
340  r * sprite_ref[0][1] - 16 * w2 * h3 +
341  (1 << (alpha + beta + rho - min_ab + 1));
342  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
343  s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
344  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
345  s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
346 
347  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
348  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
349  break;
350  }
351  /* try to simplify the situation */
352  if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
353  s->sprite_delta[0][1] == 0 &&
354  s->sprite_delta[1][0] == 0 &&
355  s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
356  s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
357  s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
358  s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
359  s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
360  s->sprite_delta[0][0] = a;
361  s->sprite_delta[0][1] = 0;
362  s->sprite_delta[1][0] = 0;
363  s->sprite_delta[1][1] = a;
364  ctx->sprite_shift[0] = 0;
365  ctx->sprite_shift[1] = 0;
367  } else {
368  int shift_y = 16 - ctx->sprite_shift[0];
369  int shift_c = 16 - ctx->sprite_shift[1];
370 
371  if (shift_c < 0 || shift_y < 0 ||
372  FFABS(s->sprite_offset[0][0]) >= INT_MAX >> shift_y ||
373  FFABS(s->sprite_offset[1][0]) >= INT_MAX >> shift_c ||
374  FFABS(s->sprite_offset[0][1]) >= INT_MAX >> shift_y ||
375  FFABS(s->sprite_offset[1][1]) >= INT_MAX >> shift_c
376  ) {
377  avpriv_request_sample(s->avctx, "Too large sprite shift or offset");
378  goto overflow;
379  }
380 
381  for (i = 0; i < 2; i++) {
382  s->sprite_offset[0][i] *= 1 << shift_y;
383  s->sprite_offset[1][i] *= 1 << shift_c;
384  s->sprite_delta[0][i] *= 1 << shift_y;
385  s->sprite_delta[1][i] *= 1 << shift_y;
386  ctx->sprite_shift[i] = 16;
387 
388  }
389  for (i = 0; i < 2; i++) {
390  int64_t sd[2] = {
391  s->sprite_delta[i][0] - a * (1LL<<16),
392  s->sprite_delta[i][1] - a * (1LL<<16)
393  };
394 
395  if (llabs(s->sprite_offset[0][i] + s->sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
396  llabs(s->sprite_offset[0][i] + s->sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
397  llabs(s->sprite_offset[0][i] + s->sprite_delta[i][0] * (w+16LL) + s->sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
398  llabs(s->sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
399  llabs(s->sprite_delta[i][1] * (w+16LL)) >= INT_MAX ||
400  llabs(sd[0]) >= INT_MAX ||
401  llabs(sd[1]) >= INT_MAX ||
402  llabs(s->sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
403  llabs(s->sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
404  llabs(s->sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
405  ) {
406  avpriv_request_sample(s->avctx, "Overflow on sprite points");
407  goto overflow;
408  }
409  }
411  }
412 
413  return 0;
414 overflow:
415  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
416  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
417  return AVERROR_PATCHWELCOME;
418 }
419 
421  MpegEncContext *s = &ctx->m;
422  int len = FFMIN(ctx->time_increment_bits + 3, 15);
423 
424  get_bits(gb, len);
425  if (get_bits1(gb))
426  get_bits(gb, len);
427  check_marker(s->avctx, gb, "after new_pred");
428 
429  return 0;
430 }
431 
432 /**
433  * Decode the next video packet.
434  * @return <0 if something went wrong
435  */
437 {
438  MpegEncContext *s = &ctx->m;
439 
440  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
441  int header_extension = 0, mb_num, len;
442 
443  /* is there enough space left for a video packet + header */
444  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
445  return -1;
446 
447  for (len = 0; len < 32; len++)
448  if (get_bits1(&s->gb))
449  break;
450 
452  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
453  return -1;
454  }
455 
456  if (ctx->shape != RECT_SHAPE) {
457  header_extension = get_bits1(&s->gb);
458  // FIXME more stuff here
459  }
460 
461  mb_num = get_bits(&s->gb, mb_num_bits);
462  if (mb_num >= s->mb_num) {
464  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
465  return -1;
466  }
467 
468  s->mb_x = mb_num % s->mb_width;
469  s->mb_y = mb_num / s->mb_width;
470 
471  if (ctx->shape != BIN_ONLY_SHAPE) {
472  int qscale = get_bits(&s->gb, s->quant_precision);
473  if (qscale)
474  s->chroma_qscale = s->qscale = qscale;
475  }
476 
477  if (ctx->shape == RECT_SHAPE)
478  header_extension = get_bits1(&s->gb);
479 
480  if (header_extension) {
481  int time_incr = 0;
482 
483  while (get_bits1(&s->gb) != 0)
484  time_incr++;
485 
486  check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
487  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
488  check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
489 
490  skip_bits(&s->gb, 2); /* vop coding type */
491  // FIXME not rect stuff here
492 
493  if (ctx->shape != BIN_ONLY_SHAPE) {
494  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
495  // FIXME don't just ignore everything
496  if (s->pict_type == AV_PICTURE_TYPE_S &&
497  ctx->vol_sprite_usage == GMC_SPRITE) {
498  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
499  return AVERROR_INVALIDDATA;
500  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
501  }
502 
503  // FIXME reduced res stuff here
504 
505  if (s->pict_type != AV_PICTURE_TYPE_I) {
506  int f_code = get_bits(&s->gb, 3); /* fcode_for */
507  if (f_code == 0)
509  "Error, video packet header damaged (f_code=0)\n");
510  }
511  if (s->pict_type == AV_PICTURE_TYPE_B) {
512  int b_code = get_bits(&s->gb, 3);
513  if (b_code == 0)
515  "Error, video packet header damaged (b_code=0)\n");
516  }
517  }
518  }
519  if (ctx->new_pred)
520  decode_new_pred(ctx, &s->gb);
521 
522  return 0;
523 }
524 
525 /**
526  * Get the average motion vector for a GMC MB.
527  * @param n either 0 for the x component or 1 for y
528  * @return the average MV for a GMC MB
529  */
530 static inline int get_amv(Mpeg4DecContext *ctx, int n)
531 {
532  MpegEncContext *s = &ctx->m;
533  int x, y, mb_v, sum, dx, dy, shift;
534  int len = 1 << (s->f_code + 4);
535  const int a = s->sprite_warping_accuracy;
536 
537  if (s->workaround_bugs & FF_BUG_AMV)
538  len >>= s->quarter_sample;
539 
540  if (s->real_sprite_warping_points == 1) {
541  if (ctx->divx_version == 500 && ctx->divx_build == 413)
542  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
543  else
544  sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
545  } else {
546  dx = s->sprite_delta[n][0];
547  dy = s->sprite_delta[n][1];
548  shift = ctx->sprite_shift[0];
549  if (n)
550  dy -= 1 << (shift + a + 1);
551  else
552  dx -= 1 << (shift + a + 1);
553  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
554 
555  sum = 0;
556  for (y = 0; y < 16; y++) {
557  int v;
558 
559  v = mb_v + dy * y;
560  // FIXME optimize
561  for (x = 0; x < 16; x++) {
562  sum += v >> shift;
563  v += dx;
564  }
565  }
566  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
567  }
568 
569  if (sum < -len)
570  sum = -len;
571  else if (sum >= len)
572  sum = len - 1;
573 
574  return sum;
575 }
576 
577 /**
578  * Decode the dc value.
579  * @param n block index (0-3 are luma, 4-5 are chroma)
580  * @param dir_ptr the prediction direction will be stored here
581  * @return the quantized dc
582  */
583 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
584 {
585  int level, code;
586 
587  if (n < 4)
588  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
589  else
590  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
591 
592  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
593  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
594  return -1;
595  }
596 
597  if (code == 0) {
598  level = 0;
599  } else {
600  if (IS_3IV1) {
601  if (code == 1)
602  level = 2 * get_bits1(&s->gb) - 1;
603  else {
604  if (get_bits1(&s->gb))
605  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
606  else
607  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
608  }
609  } else {
610  level = get_xbits(&s->gb, code);
611  }
612 
613  if (code > 8) {
614  if (get_bits1(&s->gb) == 0) { /* marker */
616  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
617  return -1;
618  }
619  }
620  }
621  }
622 
623  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
624 }
625 
626 /**
627  * Decode first partition.
628  * @return number of MBs decoded or <0 if an error occurred
629  */
631 {
632  MpegEncContext *s = &ctx->m;
633  int mb_num = 0;
634  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
635 
636  /* decode first partition */
637  s->first_slice_line = 1;
638  for (; s->mb_y < s->mb_height; s->mb_y++) {
640  for (; s->mb_x < s->mb_width; s->mb_x++) {
641  const int xy = s->mb_x + s->mb_y * s->mb_stride;
642  int cbpc;
643  int dir = 0;
644 
645  mb_num++;
647  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
648  s->first_slice_line = 0;
649 
650  if (s->pict_type == AV_PICTURE_TYPE_I) {
651  int i;
652 
653  do {
654  if (show_bits_long(&s->gb, 19) == DC_MARKER)
655  return mb_num - 1;
656 
658  if (cbpc < 0) {
660  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
661  return -1;
662  }
663  } while (cbpc == 8);
664 
665  s->cbp_table[xy] = cbpc & 3;
667  s->mb_intra = 1;
668 
669  if (cbpc & 4)
670  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
671 
672  s->current_picture.qscale_table[xy] = s->qscale;
673 
674  s->mbintra_table[xy] = 1;
675  for (i = 0; i < 6; i++) {
676  int dc_pred_dir;
677  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
678  if (dc < 0) {
680  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
681  return -1;
682  }
683  dir <<= 1;
684  if (dc_pred_dir)
685  dir |= 1;
686  }
687  s->pred_dir_table[xy] = dir;
688  } else { /* P/S_TYPE */
689  int mx, my, pred_x, pred_y, bits;
690  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
691  const int stride = s->b8_stride * 2;
692 
693 try_again:
694  bits = show_bits(&s->gb, 17);
695  if (bits == MOTION_MARKER)
696  return mb_num - 1;
697 
698  skip_bits1(&s->gb);
699  if (bits & 0x10000) {
700  /* skip mb */
701  if (s->pict_type == AV_PICTURE_TYPE_S &&
702  ctx->vol_sprite_usage == GMC_SPRITE) {
704  MB_TYPE_16x16 |
705  MB_TYPE_GMC |
706  MB_TYPE_L0;
707  mx = get_amv(ctx, 0);
708  my = get_amv(ctx, 1);
709  } else {
711  MB_TYPE_16x16 |
712  MB_TYPE_L0;
713  mx = my = 0;
714  }
715  mot_val[0] =
716  mot_val[2] =
717  mot_val[0 + stride] =
718  mot_val[2 + stride] = mx;
719  mot_val[1] =
720  mot_val[3] =
721  mot_val[1 + stride] =
722  mot_val[3 + stride] = my;
723 
724  if (s->mbintra_table[xy])
726  continue;
727  }
728 
730  if (cbpc < 0) {
732  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
733  return -1;
734  }
735  if (cbpc == 20)
736  goto try_again;
737 
738  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
739 
740  s->mb_intra = ((cbpc & 4) != 0);
741 
742  if (s->mb_intra) {
744  s->mbintra_table[xy] = 1;
745  mot_val[0] =
746  mot_val[2] =
747  mot_val[0 + stride] =
748  mot_val[2 + stride] = 0;
749  mot_val[1] =
750  mot_val[3] =
751  mot_val[1 + stride] =
752  mot_val[3 + stride] = 0;
753  } else {
754  if (s->mbintra_table[xy])
756 
757  if (s->pict_type == AV_PICTURE_TYPE_S &&
758  ctx->vol_sprite_usage == GMC_SPRITE &&
759  (cbpc & 16) == 0)
760  s->mcsel = get_bits1(&s->gb);
761  else
762  s->mcsel = 0;
763 
764  if ((cbpc & 16) == 0) {
765  /* 16x16 motion prediction */
766 
767  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
768  if (!s->mcsel) {
769  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
770  if (mx >= 0xffff)
771  return -1;
772 
773  my = ff_h263_decode_motion(s, pred_y, s->f_code);
774  if (my >= 0xffff)
775  return -1;
777  MB_TYPE_L0;
778  } else {
779  mx = get_amv(ctx, 0);
780  my = get_amv(ctx, 1);
782  MB_TYPE_GMC |
783  MB_TYPE_L0;
784  }
785 
786  mot_val[0] =
787  mot_val[2] =
788  mot_val[0 + stride] =
789  mot_val[2 + stride] = mx;
790  mot_val[1] =
791  mot_val[3] =
792  mot_val[1 + stride] =
793  mot_val[3 + stride] = my;
794  } else {
795  int i;
797  MB_TYPE_L0;
798  for (i = 0; i < 4; i++) {
799  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
800  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
801  if (mx >= 0xffff)
802  return -1;
803 
804  my = ff_h263_decode_motion(s, pred_y, s->f_code);
805  if (my >= 0xffff)
806  return -1;
807  mot_val[0] = mx;
808  mot_val[1] = my;
809  }
810  }
811  }
812  }
813  }
814  s->mb_x = 0;
815  }
816 
817  return mb_num;
818 }
819 
820 /**
821  * decode second partition.
822  * @return <0 if an error occurred
823  */
824 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
825 {
826  int mb_num = 0;
827  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
828 
829  s->mb_x = s->resync_mb_x;
830  s->first_slice_line = 1;
831  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
833  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
834  const int xy = s->mb_x + s->mb_y * s->mb_stride;
835 
836  mb_num++;
838  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
839  s->first_slice_line = 0;
840 
841  if (s->pict_type == AV_PICTURE_TYPE_I) {
842  int ac_pred = get_bits1(&s->gb);
843  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
844  if (cbpy < 0) {
846  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
847  return -1;
848  }
849 
850  s->cbp_table[xy] |= cbpy << 2;
851  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
852  } else { /* P || S_TYPE */
853  if (IS_INTRA(s->current_picture.mb_type[xy])) {
854  int i;
855  int dir = 0;
856  int ac_pred = get_bits1(&s->gb);
857  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
858 
859  if (cbpy < 0) {
861  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
862  return -1;
863  }
864 
865  if (s->cbp_table[xy] & 8)
866  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
867  s->current_picture.qscale_table[xy] = s->qscale;
868 
869  for (i = 0; i < 6; i++) {
870  int dc_pred_dir;
871  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
872  if (dc < 0) {
874  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
875  return -1;
876  }
877  dir <<= 1;
878  if (dc_pred_dir)
879  dir |= 1;
880  }
881  s->cbp_table[xy] &= 3; // remove dquant
882  s->cbp_table[xy] |= cbpy << 2;
883  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
884  s->pred_dir_table[xy] = dir;
885  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
886  s->current_picture.qscale_table[xy] = s->qscale;
887  s->cbp_table[xy] = 0;
888  } else {
889  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
890 
891  if (cbpy < 0) {
893  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
894  return -1;
895  }
896 
897  if (s->cbp_table[xy] & 8)
898  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
899  s->current_picture.qscale_table[xy] = s->qscale;
900 
901  s->cbp_table[xy] &= 3; // remove dquant
902  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
903  }
904  }
905  }
906  if (mb_num >= mb_count)
907  return 0;
908  s->mb_x = 0;
909  }
910  return 0;
911 }
912 
913 /**
914  * Decode the first and second partition.
915  * @return <0 if error (and sets error type in the error_status_table)
916  */
918 {
919  MpegEncContext *s = &ctx->m;
920  int mb_num;
921  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
922  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
923 
924  mb_num = mpeg4_decode_partition_a(ctx);
925  if (mb_num <= 0) {
927  s->mb_x, s->mb_y, part_a_error);
928  return -1;
929  }
930 
931  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
932  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
934  s->mb_x, s->mb_y, part_a_error);
935  return -1;
936  }
937 
938  s->mb_num_left = mb_num;
939 
940  if (s->pict_type == AV_PICTURE_TYPE_I) {
941  while (show_bits(&s->gb, 9) == 1)
942  skip_bits(&s->gb, 9);
943  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
945  "marker missing after first I partition at %d %d\n",
946  s->mb_x, s->mb_y);
947  return -1;
948  }
949  } else {
950  while (show_bits(&s->gb, 10) == 1)
951  skip_bits(&s->gb, 10);
952  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
954  "marker missing after first P partition at %d %d\n",
955  s->mb_x, s->mb_y);
956  return -1;
957  }
958  }
960  s->mb_x - 1, s->mb_y, part_a_end);
961 
962  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
963  if (s->pict_type == AV_PICTURE_TYPE_P)
965  s->mb_x, s->mb_y, ER_DC_ERROR);
966  return -1;
967  } else {
968  if (s->pict_type == AV_PICTURE_TYPE_P)
970  s->mb_x - 1, s->mb_y, ER_DC_END);
971  }
972 
973  return 0;
974 }
975 
976 /**
977  * Decode a block.
978  * @return <0 if an error occurred
979  */
980 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
981  int n, int coded, int intra, int rvlc)
982 {
983  MpegEncContext *s = &ctx->m;
984  int level, i, last, run, qmul, qadd;
985  int av_uninit(dc_pred_dir);
986  RLTable *rl;
987  RL_VLC_ELEM *rl_vlc;
988  const uint8_t *scan_table;
989 
990  // Note intra & rvlc should be optimized away if this is inlined
991 
992  if (intra) {
993  if (ctx->use_intra_dc_vlc) {
994  /* DC coef */
995  if (s->partitioned_frame) {
996  level = s->dc_val[0][s->block_index[n]];
997  if (n < 4)
998  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
999  else
1000  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1001  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1002  } else {
1003  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1004  if (level < 0)
1005  return -1;
1006  }
1007  block[0] = level;
1008  i = 0;
1009  } else {
1010  i = -1;
1011  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1012  }
1013  if (!coded)
1014  goto not_coded;
1015 
1016  if (rvlc) {
1017  rl = &ff_rvlc_rl_intra;
1018  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1019  } else {
1020  rl = &ff_mpeg4_rl_intra;
1021  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1022  }
1023  if (s->ac_pred) {
1024  if (dc_pred_dir == 0)
1025  scan_table = s->intra_v_scantable.permutated; /* left */
1026  else
1027  scan_table = s->intra_h_scantable.permutated; /* top */
1028  } else {
1029  scan_table = s->intra_scantable.permutated;
1030  }
1031  qmul = 1;
1032  qadd = 0;
1033  } else {
1034  i = -1;
1035  if (!coded) {
1036  s->block_last_index[n] = i;
1037  return 0;
1038  }
1039  if (rvlc)
1040  rl = &ff_rvlc_rl_inter;
1041  else
1042  rl = &ff_h263_rl_inter;
1043 
1044  scan_table = s->intra_scantable.permutated;
1045 
1046  if (s->mpeg_quant) {
1047  qmul = 1;
1048  qadd = 0;
1049  if (rvlc)
1050  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1051  else
1052  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1053  } else {
1054  qmul = s->qscale << 1;
1055  qadd = (s->qscale - 1) | 1;
1056  if (rvlc)
1057  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1058  else
1059  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1060  }
1061  }
1062  {
1063  OPEN_READER(re, &s->gb);
1064  for (;;) {
1065  UPDATE_CACHE(re, &s->gb);
1066  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1067  if (level == 0) {
1068  /* escape */
1069  if (rvlc) {
1070  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1072  "1. marker bit missing in rvlc esc\n");
1073  return -1;
1074  }
1075  SKIP_CACHE(re, &s->gb, 1);
1076 
1077  last = SHOW_UBITS(re, &s->gb, 1);
1078  SKIP_CACHE(re, &s->gb, 1);
1079  run = SHOW_UBITS(re, &s->gb, 6);
1080  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1081  UPDATE_CACHE(re, &s->gb);
1082 
1083  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1085  "2. marker bit missing in rvlc esc\n");
1086  return -1;
1087  }
1088  SKIP_CACHE(re, &s->gb, 1);
1089 
1090  level = SHOW_UBITS(re, &s->gb, 11);
1091  SKIP_CACHE(re, &s->gb, 11);
1092 
1093  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1094  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1095  return -1;
1096  }
1097  SKIP_CACHE(re, &s->gb, 5);
1098 
1099  level = level * qmul + qadd;
1100  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1101  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1102 
1103  i += run + 1;
1104  if (last)
1105  i += 192;
1106  } else {
1107  int cache;
1108  cache = GET_CACHE(re, &s->gb);
1109 
1110  if (IS_3IV1)
1111  cache ^= 0xC0000000;
1112 
1113  if (cache & 0x80000000) {
1114  if (cache & 0x40000000) {
1115  /* third escape */
1116  SKIP_CACHE(re, &s->gb, 2);
1117  last = SHOW_UBITS(re, &s->gb, 1);
1118  SKIP_CACHE(re, &s->gb, 1);
1119  run = SHOW_UBITS(re, &s->gb, 6);
1120  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1121  UPDATE_CACHE(re, &s->gb);
1122 
1123  if (IS_3IV1) {
1124  level = SHOW_SBITS(re, &s->gb, 12);
1125  LAST_SKIP_BITS(re, &s->gb, 12);
1126  } else {
1127  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1129  "1. marker bit missing in 3. esc\n");
1130  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1131  return -1;
1132  }
1133  SKIP_CACHE(re, &s->gb, 1);
1134 
1135  level = SHOW_SBITS(re, &s->gb, 12);
1136  SKIP_CACHE(re, &s->gb, 12);
1137 
1138  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1140  "2. marker bit missing in 3. esc\n");
1141  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1142  return -1;
1143  }
1144 
1145  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1146  }
1147 
1148 #if 0
1149  if (s->error_recognition >= FF_ER_COMPLIANT) {
1150  const int abs_level= FFABS(level);
1151  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1152  const int run1= run - rl->max_run[last][abs_level] - 1;
1153  if (abs_level <= rl->max_level[last][run]) {
1154  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1155  return -1;
1156  }
1157  if (s->error_recognition > FF_ER_COMPLIANT) {
1158  if (abs_level <= rl->max_level[last][run]*2) {
1159  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1160  return -1;
1161  }
1162  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1163  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1164  return -1;
1165  }
1166  }
1167  }
1168  }
1169 #endif
1170  if (level > 0)
1171  level = level * qmul + qadd;
1172  else
1173  level = level * qmul - qadd;
1174 
1175  if ((unsigned)(level + 2048) > 4095) {
1177  if (level > 2560 || level < -2560) {
1179  "|level| overflow in 3. esc, qp=%d\n",
1180  s->qscale);
1181  return -1;
1182  }
1183  }
1184  level = level < 0 ? -2048 : 2047;
1185  }
1186 
1187  i += run + 1;
1188  if (last)
1189  i += 192;
1190  } else {
1191  /* second escape */
1192  SKIP_BITS(re, &s->gb, 2);
1193  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1194  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1195  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1196  LAST_SKIP_BITS(re, &s->gb, 1);
1197  }
1198  } else {
1199  /* first escape */
1200  SKIP_BITS(re, &s->gb, 1);
1201  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1202  i += run;
1203  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1204  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1205  LAST_SKIP_BITS(re, &s->gb, 1);
1206  }
1207  }
1208  } else {
1209  i += run;
1210  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1211  LAST_SKIP_BITS(re, &s->gb, 1);
1212  }
1213  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1214  if (i > 62) {
1215  i -= 192;
1216  if (i & (~63)) {
1218  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1219  return -1;
1220  }
1221 
1222  block[scan_table[i]] = level;
1223  break;
1224  }
1225 
1226  block[scan_table[i]] = level;
1227  }
1228  CLOSE_READER(re, &s->gb);
1229  }
1230 
1231 not_coded:
1232  if (intra) {
1233  if (!ctx->use_intra_dc_vlc) {
1234  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1235 
1236  i -= i >> 31; // if (i == -1) i = 0;
1237  }
1238 
1239  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1240  if (s->ac_pred)
1241  i = 63; // FIXME not optimal
1242  }
1243  s->block_last_index[n] = i;
1244  return 0;
1245 }
1246 
1247 /**
1248  * decode partition C of one MB.
1249  * @return <0 if an error occurred
1250  */
1252 {
1254  int cbp, mb_type;
1255  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1256 
1257  mb_type = s->current_picture.mb_type[xy];
1258  cbp = s->cbp_table[xy];
1259 
1260  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1261 
1262  if (s->current_picture.qscale_table[xy] != s->qscale)
1264 
1265  if (s->pict_type == AV_PICTURE_TYPE_P ||
1266  s->pict_type == AV_PICTURE_TYPE_S) {
1267  int i;
1268  for (i = 0; i < 4; i++) {
1269  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1270  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1271  }
1272  s->mb_intra = IS_INTRA(mb_type);
1273 
1274  if (IS_SKIP(mb_type)) {
1275  /* skip mb */
1276  for (i = 0; i < 6; i++)
1277  s->block_last_index[i] = -1;
1278  s->mv_dir = MV_DIR_FORWARD;
1279  s->mv_type = MV_TYPE_16X16;
1281  && ctx->vol_sprite_usage == GMC_SPRITE) {
1282  s->mcsel = 1;
1283  s->mb_skipped = 0;
1284  } else {
1285  s->mcsel = 0;
1286  s->mb_skipped = 1;
1287  }
1288  } else if (s->mb_intra) {
1290  } else if (!s->mb_intra) {
1291  // s->mcsel = 0; // FIXME do we need to init that?
1292 
1293  s->mv_dir = MV_DIR_FORWARD;
1294  if (IS_8X8(mb_type)) {
1295  s->mv_type = MV_TYPE_8X8;
1296  } else {
1297  s->mv_type = MV_TYPE_16X16;
1298  }
1299  }
1300  } else { /* I-Frame */
1301  s->mb_intra = 1;
1303  }
1304 
1305  if (!IS_SKIP(mb_type)) {
1306  int i;
1307  s->bdsp.clear_blocks(s->block[0]);
1308  /* decode each block */
1309  for (i = 0; i < 6; i++) {
1310  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1312  "texture corrupted at %d %d %d\n",
1313  s->mb_x, s->mb_y, s->mb_intra);
1314  return -1;
1315  }
1316  cbp += cbp;
1317  }
1318  }
1319 
1320  /* per-MB end of slice check */
1321  if (--s->mb_num_left <= 0) {
1322  if (mpeg4_is_resync(ctx))
1323  return SLICE_END;
1324  else
1325  return SLICE_NOEND;
1326  } else {
1327  if (mpeg4_is_resync(ctx)) {
1328  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1329  if (s->cbp_table[xy + delta])
1330  return SLICE_END;
1331  }
1332  return SLICE_OK;
1333  }
1334 }
1335 
1336 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1337 {
1339  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1340  int16_t *mot_val;
1341  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1342  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1343 
1344  av_assert2(s->h263_pred);
1345 
1346  if (s->pict_type == AV_PICTURE_TYPE_P ||
1347  s->pict_type == AV_PICTURE_TYPE_S) {
1348  do {
1349  if (get_bits1(&s->gb)) {
1350  /* skip mb */
1351  s->mb_intra = 0;
1352  for (i = 0; i < 6; i++)
1353  s->block_last_index[i] = -1;
1354  s->mv_dir = MV_DIR_FORWARD;
1355  s->mv_type = MV_TYPE_16X16;
1356  if (s->pict_type == AV_PICTURE_TYPE_S &&
1357  ctx->vol_sprite_usage == GMC_SPRITE) {
1359  MB_TYPE_GMC |
1360  MB_TYPE_16x16 |
1361  MB_TYPE_L0;
1362  s->mcsel = 1;
1363  s->mv[0][0][0] = get_amv(ctx, 0);
1364  s->mv[0][0][1] = get_amv(ctx, 1);
1365  s->mb_skipped = 0;
1366  } else {
1368  MB_TYPE_16x16 |
1369  MB_TYPE_L0;
1370  s->mcsel = 0;
1371  s->mv[0][0][0] = 0;
1372  s->mv[0][0][1] = 0;
1373  s->mb_skipped = 1;
1374  }
1375  goto end;
1376  }
1378  if (cbpc < 0) {
1380  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1381  return -1;
1382  }
1383  } while (cbpc == 20);
1384 
1385  s->bdsp.clear_blocks(s->block[0]);
1386  dquant = cbpc & 8;
1387  s->mb_intra = ((cbpc & 4) != 0);
1388  if (s->mb_intra)
1389  goto intra;
1390 
1391  if (s->pict_type == AV_PICTURE_TYPE_S &&
1392  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1393  s->mcsel = get_bits1(&s->gb);
1394  else
1395  s->mcsel = 0;
1396  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1397  if (cbpy < 0) {
1399  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1400  return AVERROR_INVALIDDATA;
1401  }
1402 
1403  cbp = (cbpc & 3) | (cbpy << 2);
1404  if (dquant)
1405  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1406  if ((!s->progressive_sequence) &&
1407  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1408  s->interlaced_dct = get_bits1(&s->gb);
1409 
1410  s->mv_dir = MV_DIR_FORWARD;
1411  if ((cbpc & 16) == 0) {
1412  if (s->mcsel) {
1414  MB_TYPE_16x16 |
1415  MB_TYPE_L0;
1416  /* 16x16 global motion prediction */
1417  s->mv_type = MV_TYPE_16X16;
1418  mx = get_amv(ctx, 0);
1419  my = get_amv(ctx, 1);
1420  s->mv[0][0][0] = mx;
1421  s->mv[0][0][1] = my;
1422  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1424  MB_TYPE_L0 |
1426  /* 16x8 field motion prediction */
1427  s->mv_type = MV_TYPE_FIELD;
1428 
1429  s->field_select[0][0] = get_bits1(&s->gb);
1430  s->field_select[0][1] = get_bits1(&s->gb);
1431 
1432  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1433 
1434  for (i = 0; i < 2; i++) {
1435  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1436  if (mx >= 0xffff)
1437  return -1;
1438 
1439  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1440  if (my >= 0xffff)
1441  return -1;
1442 
1443  s->mv[0][i][0] = mx;
1444  s->mv[0][i][1] = my;
1445  }
1446  } else {
1448  /* 16x16 motion prediction */
1449  s->mv_type = MV_TYPE_16X16;
1450  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1451  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1452 
1453  if (mx >= 0xffff)
1454  return -1;
1455 
1456  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1457 
1458  if (my >= 0xffff)
1459  return -1;
1460  s->mv[0][0][0] = mx;
1461  s->mv[0][0][1] = my;
1462  }
1463  } else {
1465  s->mv_type = MV_TYPE_8X8;
1466  for (i = 0; i < 4; i++) {
1467  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1468  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1469  if (mx >= 0xffff)
1470  return -1;
1471 
1472  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1473  if (my >= 0xffff)
1474  return -1;
1475  s->mv[0][i][0] = mx;
1476  s->mv[0][i][1] = my;
1477  mot_val[0] = mx;
1478  mot_val[1] = my;
1479  }
1480  }
1481  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1482  int modb1; // first bit of modb
1483  int modb2; // second bit of modb
1484  int mb_type;
1485 
1486  s->mb_intra = 0; // B-frames never contain intra blocks
1487  s->mcsel = 0; // ... true gmc blocks
1488 
1489  if (s->mb_x == 0) {
1490  for (i = 0; i < 2; i++) {
1491  s->last_mv[i][0][0] =
1492  s->last_mv[i][0][1] =
1493  s->last_mv[i][1][0] =
1494  s->last_mv[i][1][1] = 0;
1495  }
1496 
1498  }
1499 
1500  /* if we skipped it in the future P-frame than skip it now too */
1501  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1502 
1503  if (s->mb_skipped) {
1504  /* skip mb */
1505  for (i = 0; i < 6; i++)
1506  s->block_last_index[i] = -1;
1507 
1508  s->mv_dir = MV_DIR_FORWARD;
1509  s->mv_type = MV_TYPE_16X16;
1510  s->mv[0][0][0] =
1511  s->mv[0][0][1] =
1512  s->mv[1][0][0] =
1513  s->mv[1][0][1] = 0;
1515  MB_TYPE_16x16 |
1516  MB_TYPE_L0;
1517  goto end;
1518  }
1519 
1520  modb1 = get_bits1(&s->gb);
1521  if (modb1) {
1522  // like MB_TYPE_B_DIRECT but no vectors coded
1524  cbp = 0;
1525  } else {
1526  modb2 = get_bits1(&s->gb);
1527  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1528  if (mb_type < 0) {
1529  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1530  return -1;
1531  }
1532  mb_type = mb_type_b_map[mb_type];
1533  if (modb2) {
1534  cbp = 0;
1535  } else {
1536  s->bdsp.clear_blocks(s->block[0]);
1537  cbp = get_bits(&s->gb, 6);
1538  }
1539 
1540  if ((!IS_DIRECT(mb_type)) && cbp) {
1541  if (get_bits1(&s->gb))
1542  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1543  }
1544 
1545  if (!s->progressive_sequence) {
1546  if (cbp)
1547  s->interlaced_dct = get_bits1(&s->gb);
1548 
1549  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1550  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1551  mb_type &= ~MB_TYPE_16x16;
1552 
1553  if (USES_LIST(mb_type, 0)) {
1554  s->field_select[0][0] = get_bits1(&s->gb);
1555  s->field_select[0][1] = get_bits1(&s->gb);
1556  }
1557  if (USES_LIST(mb_type, 1)) {
1558  s->field_select[1][0] = get_bits1(&s->gb);
1559  s->field_select[1][1] = get_bits1(&s->gb);
1560  }
1561  }
1562  }
1563 
1564  s->mv_dir = 0;
1565  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1566  s->mv_type = MV_TYPE_16X16;
1567 
1568  if (USES_LIST(mb_type, 0)) {
1569  s->mv_dir = MV_DIR_FORWARD;
1570 
1571  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1572  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1573  s->last_mv[0][1][0] =
1574  s->last_mv[0][0][0] =
1575  s->mv[0][0][0] = mx;
1576  s->last_mv[0][1][1] =
1577  s->last_mv[0][0][1] =
1578  s->mv[0][0][1] = my;
1579  }
1580 
1581  if (USES_LIST(mb_type, 1)) {
1582  s->mv_dir |= MV_DIR_BACKWARD;
1583 
1584  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1585  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1586  s->last_mv[1][1][0] =
1587  s->last_mv[1][0][0] =
1588  s->mv[1][0][0] = mx;
1589  s->last_mv[1][1][1] =
1590  s->last_mv[1][0][1] =
1591  s->mv[1][0][1] = my;
1592  }
1593  } else if (!IS_DIRECT(mb_type)) {
1594  s->mv_type = MV_TYPE_FIELD;
1595 
1596  if (USES_LIST(mb_type, 0)) {
1597  s->mv_dir = MV_DIR_FORWARD;
1598 
1599  for (i = 0; i < 2; i++) {
1600  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1601  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1602  s->last_mv[0][i][0] =
1603  s->mv[0][i][0] = mx;
1604  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1605  }
1606  }
1607 
1608  if (USES_LIST(mb_type, 1)) {
1609  s->mv_dir |= MV_DIR_BACKWARD;
1610 
1611  for (i = 0; i < 2; i++) {
1612  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1613  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1614  s->last_mv[1][i][0] =
1615  s->mv[1][i][0] = mx;
1616  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1617  }
1618  }
1619  }
1620  }
1621 
1622  if (IS_DIRECT(mb_type)) {
1623  if (IS_SKIP(mb_type)) {
1624  mx =
1625  my = 0;
1626  } else {
1627  mx = ff_h263_decode_motion(s, 0, 1);
1628  my = ff_h263_decode_motion(s, 0, 1);
1629  }
1630 
1632  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1633  }
1634  s->current_picture.mb_type[xy] = mb_type;
1635  } else { /* I-Frame */
1636  do {
1638  if (cbpc < 0) {
1640  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1641  return -1;
1642  }
1643  } while (cbpc == 8);
1644 
1645  dquant = cbpc & 4;
1646  s->mb_intra = 1;
1647 
1648 intra:
1649  s->ac_pred = get_bits1(&s->gb);
1650  if (s->ac_pred)
1652  else
1654 
1655  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1656  if (cbpy < 0) {
1658  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1659  return -1;
1660  }
1661  cbp = (cbpc & 3) | (cbpy << 2);
1662 
1663  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1664 
1665  if (dquant)
1666  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1667 
1668  if (!s->progressive_sequence)
1669  s->interlaced_dct = get_bits1(&s->gb);
1670 
1671  s->bdsp.clear_blocks(s->block[0]);
1672  /* decode each block */
1673  for (i = 0; i < 6; i++) {
1674  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1675  return -1;
1676  cbp += cbp;
1677  }
1678  goto end;
1679  }
1680 
1681  /* decode each block */
1682  for (i = 0; i < 6; i++) {
1683  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1684  return -1;
1685  cbp += cbp;
1686  }
1687 
1688 end:
1689  /* per-MB end of slice check */
1690  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1691  int next = mpeg4_is_resync(ctx);
1692  if (next) {
1693  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1694  return -1;
1695  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1696  return SLICE_END;
1697 
1698  if (s->pict_type == AV_PICTURE_TYPE_B) {
1699  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1701  (s->mb_x + delta >= s->mb_width)
1702  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1703  : s->mb_y, 0);
1704  if (s->next_picture.mbskip_table[xy + delta])
1705  return SLICE_OK;
1706  }
1707 
1708  return SLICE_END;
1709  }
1710  }
1711 
1712  return SLICE_OK;
1713 }
1714 
1716 {
1717  int hours, minutes, seconds;
1718 
1719  if (!show_bits(gb, 23)) {
1720  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1721  return -1;
1722  }
1723 
1724  hours = get_bits(gb, 5);
1725  minutes = get_bits(gb, 6);
1726  check_marker(s->avctx, gb, "in gop_header");
1727  seconds = get_bits(gb, 6);
1728 
1729  s->time_base = seconds + 60*(minutes + 60*hours);
1730 
1731  skip_bits1(gb);
1732  skip_bits1(gb);
1733 
1734  return 0;
1735 }
1736 
1738 {
1739 
1740  s->avctx->profile = get_bits(gb, 4);
1741  s->avctx->level = get_bits(gb, 4);
1742 
1743  // for Simple profile, level 0
1744  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1745  s->avctx->level = 0;
1746  }
1747 
1748  return 0;
1749 }
1750 
1752 {
1753  MpegEncContext *s = &ctx->m;
1754  int width, height, vo_ver_id;
1755 
1756  /* vol header */
1757  skip_bits(gb, 1); /* random access */
1758  s->vo_type = get_bits(gb, 8);
1759  if (get_bits1(gb) != 0) { /* is_ol_id */
1760  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1761  skip_bits(gb, 3); /* vo_priority */
1762  } else {
1763  vo_ver_id = 1;
1764  }
1765  s->aspect_ratio_info = get_bits(gb, 4);
1767  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1768  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1769  } else {
1771  }
1772 
1773  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1774  int chroma_format = get_bits(gb, 2);
1775  if (chroma_format != CHROMA_420)
1776  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1777 
1778  s->low_delay = get_bits1(gb);
1779  if (get_bits1(gb)) { /* vbv parameters */
1780  get_bits(gb, 15); /* first_half_bitrate */
1781  check_marker(s->avctx, gb, "after first_half_bitrate");
1782  get_bits(gb, 15); /* latter_half_bitrate */
1783  check_marker(s->avctx, gb, "after latter_half_bitrate");
1784  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1785  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1786  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1787  get_bits(gb, 11); /* first_half_vbv_occupancy */
1788  check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1789  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1790  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1791  }
1792  } else {
1793  /* is setting low delay flag only once the smartest thing to do?
1794  * low delay detection will not be overridden. */
1795  if (s->picture_number == 0) {
1796  switch(s->vo_type) {
1797  case SIMPLE_VO_TYPE:
1798  case ADV_SIMPLE_VO_TYPE:
1799  s->low_delay = 1;
1800  break;
1801  default:
1802  s->low_delay = 0;
1803  }
1804  }
1805  }
1806 
1807  ctx->shape = get_bits(gb, 2); /* vol shape */
1808  if (ctx->shape != RECT_SHAPE)
1809  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1810  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1811  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1812  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1813  }
1814 
1815  check_marker(s->avctx, gb, "before time_increment_resolution");
1816 
1817  s->avctx->framerate.num = get_bits(gb, 16);
1818  if (!s->avctx->framerate.num) {
1819  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1820  return AVERROR_INVALIDDATA;
1821  }
1822 
1823  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1824  if (ctx->time_increment_bits < 1)
1825  ctx->time_increment_bits = 1;
1826 
1827  check_marker(s->avctx, gb, "before fixed_vop_rate");
1828 
1829  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1831  else
1832  s->avctx->framerate.den = 1;
1833 
1835 
1836  ctx->t_frame = 0;
1837 
1838  if (ctx->shape != BIN_ONLY_SHAPE) {
1839  if (ctx->shape == RECT_SHAPE) {
1840  check_marker(s->avctx, gb, "before width");
1841  width = get_bits(gb, 13);
1842  check_marker(s->avctx, gb, "before height");
1843  height = get_bits(gb, 13);
1844  check_marker(s->avctx, gb, "after height");
1845  if (width && height && /* they should be non zero but who knows */
1846  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1847  if (s->width && s->height &&
1848  (s->width != width || s->height != height))
1849  s->context_reinit = 1;
1850  s->width = width;
1851  s->height = height;
1852  }
1853  }
1854 
1855  s->progressive_sequence =
1856  s->progressive_frame = get_bits1(gb) ^ 1;
1857  s->interlaced_dct = 0;
1858  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1859  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1860  "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1861  if (vo_ver_id == 1)
1862  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1863  else
1864  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1865 
1866  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1867  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1868  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1869  ctx->vol_sprite_usage == GMC_SPRITE) {
1870  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1871  skip_bits(gb, 13); // sprite_width
1872  check_marker(s->avctx, gb, "after sprite_width");
1873  skip_bits(gb, 13); // sprite_height
1874  check_marker(s->avctx, gb, "after sprite_height");
1875  skip_bits(gb, 13); // sprite_left
1876  check_marker(s->avctx, gb, "after sprite_left");
1877  skip_bits(gb, 13); // sprite_top
1878  check_marker(s->avctx, gb, "after sprite_top");
1879  }
1880  ctx->num_sprite_warping_points = get_bits(gb, 6);
1881  if (ctx->num_sprite_warping_points > 3) {
1882  av_log(s->avctx, AV_LOG_ERROR,
1883  "%d sprite_warping_points\n",
1884  ctx->num_sprite_warping_points);
1885  ctx->num_sprite_warping_points = 0;
1886  return AVERROR_INVALIDDATA;
1887  }
1888  s->sprite_warping_accuracy = get_bits(gb, 2);
1889  ctx->sprite_brightness_change = get_bits1(gb);
1890  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1891  skip_bits1(gb); // low_latency_sprite
1892  }
1893  // FIXME sadct disable bit if verid!=1 && shape not rect
1894 
1895  if (get_bits1(gb) == 1) { /* not_8_bit */
1896  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1897  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1898  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1899  if (s->quant_precision != 5)
1900  av_log(s->avctx, AV_LOG_ERROR,
1901  "quant precision %d\n", s->quant_precision);
1902  if (s->quant_precision<3 || s->quant_precision>9) {
1903  s->quant_precision = 5;
1904  }
1905  } else {
1906  s->quant_precision = 5;
1907  }
1908 
1909  // FIXME a bunch of grayscale shape things
1910 
1911  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1912  int i, v;
1913 
1914  /* load default matrixes */
1915  for (i = 0; i < 64; i++) {
1916  int j = s->idsp.idct_permutation[i];
1918  s->intra_matrix[j] = v;
1919  s->chroma_intra_matrix[j] = v;
1920 
1922  s->inter_matrix[j] = v;
1923  s->chroma_inter_matrix[j] = v;
1924  }
1925 
1926  /* load custom intra matrix */
1927  if (get_bits1(gb)) {
1928  int last = 0;
1929  for (i = 0; i < 64; i++) {
1930  int j;
1931  if (get_bits_left(gb) < 8) {
1932  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1933  return AVERROR_INVALIDDATA;
1934  }
1935  v = get_bits(gb, 8);
1936  if (v == 0)
1937  break;
1938 
1939  last = v;
1940  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1941  s->intra_matrix[j] = last;
1942  s->chroma_intra_matrix[j] = last;
1943  }
1944 
1945  /* replicate last value */
1946  for (; i < 64; i++) {
1947  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1948  s->intra_matrix[j] = last;
1949  s->chroma_intra_matrix[j] = last;
1950  }
1951  }
1952 
1953  /* load custom non intra matrix */
1954  if (get_bits1(gb)) {
1955  int last = 0;
1956  for (i = 0; i < 64; i++) {
1957  int j;
1958  if (get_bits_left(gb) < 8) {
1959  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1960  return AVERROR_INVALIDDATA;
1961  }
1962  v = get_bits(gb, 8);
1963  if (v == 0)
1964  break;
1965 
1966  last = v;
1967  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1968  s->inter_matrix[j] = v;
1969  s->chroma_inter_matrix[j] = v;
1970  }
1971 
1972  /* replicate last value */
1973  for (; i < 64; i++) {
1974  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1975  s->inter_matrix[j] = last;
1976  s->chroma_inter_matrix[j] = last;
1977  }
1978  }
1979 
1980  // FIXME a bunch of grayscale shape things
1981  }
1982 
1983  if (vo_ver_id != 1)
1984  s->quarter_sample = get_bits1(gb);
1985  else
1986  s->quarter_sample = 0;
1987 
1988  if (get_bits_left(gb) < 4) {
1989  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1990  return AVERROR_INVALIDDATA;
1991  }
1992 
1993  if (!get_bits1(gb)) {
1994  int pos = get_bits_count(gb);
1995  int estimation_method = get_bits(gb, 2);
1996  if (estimation_method < 2) {
1997  if (!get_bits1(gb)) {
1998  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1999  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2000  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2001  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2002  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2003  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2004  }
2005  if (!get_bits1(gb)) {
2006  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2007  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2008  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2009  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2010  }
2011  if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2012  skip_bits_long(gb, pos - get_bits_count(gb));
2013  goto no_cplx_est;
2014  }
2015  if (!get_bits1(gb)) {
2016  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2017  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2018  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2019  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2020  }
2021  if (!get_bits1(gb)) {
2022  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2023  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2024  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2025  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2026  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2027  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2028  }
2029  if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2030  skip_bits_long(gb, pos - get_bits_count(gb));
2031  goto no_cplx_est;
2032  }
2033  if (estimation_method == 1) {
2034  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2035  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2036  }
2037  } else
2038  av_log(s->avctx, AV_LOG_ERROR,
2039  "Invalid Complexity estimation method %d\n",
2040  estimation_method);
2041  } else {
2042 
2043 no_cplx_est:
2044  ctx->cplx_estimation_trash_i =
2045  ctx->cplx_estimation_trash_p =
2046  ctx->cplx_estimation_trash_b = 0;
2047  }
2048 
2049  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2050 
2051  s->data_partitioning = get_bits1(gb);
2052  if (s->data_partitioning)
2053  ctx->rvlc = get_bits1(gb);
2054 
2055  if (vo_ver_id != 1) {
2056  ctx->new_pred = get_bits1(gb);
2057  if (ctx->new_pred) {
2058  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2059  skip_bits(gb, 2); /* requested upstream message type */
2060  skip_bits1(gb); /* newpred segment type */
2061  }
2062  if (get_bits1(gb)) // reduced_res_vop
2063  av_log(s->avctx, AV_LOG_ERROR,
2064  "reduced resolution VOP not supported\n");
2065  } else {
2066  ctx->new_pred = 0;
2067  }
2068 
2069  ctx->scalability = get_bits1(gb);
2070 
2071  if (ctx->scalability) {
2072  GetBitContext bak = *gb;
2073  int h_sampling_factor_n;
2074  int h_sampling_factor_m;
2075  int v_sampling_factor_n;
2076  int v_sampling_factor_m;
2077 
2078  skip_bits1(gb); // hierarchy_type
2079  skip_bits(gb, 4); /* ref_layer_id */
2080  skip_bits1(gb); /* ref_layer_sampling_dir */
2081  h_sampling_factor_n = get_bits(gb, 5);
2082  h_sampling_factor_m = get_bits(gb, 5);
2083  v_sampling_factor_n = get_bits(gb, 5);
2084  v_sampling_factor_m = get_bits(gb, 5);
2085  ctx->enhancement_type = get_bits1(gb);
2086 
2087  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2088  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2089  /* illegal scalability header (VERY broken encoder),
2090  * trying to workaround */
2091  ctx->scalability = 0;
2092  *gb = bak;
2093  } else
2094  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2095 
2096  // bin shape stuff FIXME
2097  }
2098  }
2099 
2100  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2101  av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d %s%s%s%s\n",
2102  s->avctx->framerate.den, s->avctx->framerate.num,
2103  ctx->time_increment_bits,
2104  s->quant_precision,
2105  s->progressive_sequence,
2106  s->low_delay,
2107  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2108  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2109  );
2110  }
2111 
2112  return 0;
2113 }
2114 
2115 /**
2116  * Decode the user data stuff in the header.
2117  * Also initializes divx/xvid/lavc_version/build.
2118  */
2120 {
2121  MpegEncContext *s = &ctx->m;
2122  char buf[256];
2123  int i;
2124  int e;
2125  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2126  char last;
2127 
2128  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2129  if (show_bits(gb, 23) == 0)
2130  break;
2131  buf[i] = get_bits(gb, 8);
2132  }
2133  buf[i] = 0;
2134 
2135  /* divx detection */
2136  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2137  if (e < 2)
2138  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2139  if (e >= 2) {
2140  ctx->divx_version = ver;
2141  ctx->divx_build = build;
2142  s->divx_packed = e == 3 && last == 'p';
2143  }
2144 
2145  /* libavcodec detection */
2146  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2147  if (e != 4)
2148  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2149  if (e != 4) {
2150  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2151  if (e > 1)
2152  build = (ver << 16) + (ver2 << 8) + ver3;
2153  }
2154  if (e != 4) {
2155  if (strcmp(buf, "ffmpeg") == 0)
2156  ctx->lavc_build = 4600;
2157  }
2158  if (e == 4)
2159  ctx->lavc_build = build;
2160 
2161  /* Xvid detection */
2162  e = sscanf(buf, "XviD%d", &build);
2163  if (e == 1)
2164  ctx->xvid_build = build;
2165 
2166  return 0;
2167 }
2168 
2170 {
2171  Mpeg4DecContext *ctx = avctx->priv_data;
2172  MpegEncContext *s = &ctx->m;
2173 
2174  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2175  if (s->codec_tag == AV_RL32("XVID") ||
2176  s->codec_tag == AV_RL32("XVIX") ||
2177  s->codec_tag == AV_RL32("RMP4") ||
2178  s->codec_tag == AV_RL32("ZMP4") ||
2179  s->codec_tag == AV_RL32("SIPP"))
2180  ctx->xvid_build = 0;
2181  }
2182 
2183  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2184  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2185  ctx->vol_control_parameters == 0)
2186  ctx->divx_version = 400; // divx 4
2187 
2188  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2189  ctx->divx_version =
2190  ctx->divx_build = -1;
2191  }
2192 
2194  if (s->codec_tag == AV_RL32("XVIX"))
2196 
2197  if (s->codec_tag == AV_RL32("UMP4"))
2199 
2200  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2202 
2203  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2205 
2206  if (ctx->xvid_build <= 3U)
2207  s->padding_bug_score = 256 * 256 * 256 * 64;
2208 
2209  if (ctx->xvid_build <= 1U)
2211 
2212  if (ctx->xvid_build <= 12U)
2214 
2215  if (ctx->xvid_build <= 32U)
2217 
2218 #define SET_QPEL_FUNC(postfix1, postfix2) \
2219  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2220  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2221  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2222 
2223  if (ctx->lavc_build < 4653U)
2225 
2226  if (ctx->lavc_build < 4655U)
2228 
2229  if (ctx->lavc_build < 4670U)
2231 
2232  if (ctx->lavc_build <= 4712U)
2234 
2235  if ((ctx->lavc_build&0xFF) >= 100) {
2236  if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2237  (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2238  )
2240  }
2241 
2242  if (ctx->divx_version >= 0)
2244  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2245  s->padding_bug_score = 256 * 256 * 256 * 64;
2246 
2247  if (ctx->divx_version < 500U)
2249 
2250  if (ctx->divx_version >= 0)
2252  }
2253 
2254  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2255  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2256  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2257  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2258  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2259  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2260  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2261 
2262  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2263  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2264  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2265  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2266  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2267  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2268  }
2269 
2270  if (avctx->debug & FF_DEBUG_BUGS)
2272  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2273  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2274  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2275 
2276  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2277  s->codec_id == AV_CODEC_ID_MPEG4 &&
2278  avctx->idct_algo == FF_IDCT_AUTO) {
2279  avctx->idct_algo = FF_IDCT_XVID;
2280  ff_mpv_idct_init(s);
2281  return 1;
2282  }
2283 
2284  return 0;
2285 }
2286 
2288 {
2289  MpegEncContext *s = &ctx->m;
2290  int time_incr, time_increment;
2291  int64_t pts;
2292 
2293  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2294  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2296  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2297  s->low_delay = 0;
2298  }
2299 
2301  if (s->partitioned_frame)
2303  else
2305 
2306  time_incr = 0;
2307  while (get_bits1(gb) != 0)
2308  time_incr++;
2309 
2310  check_marker(s->avctx, gb, "before time_increment");
2311 
2312  if (ctx->time_increment_bits == 0 ||
2313  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2315  "time_increment_bits %d is invalid in relation to the current bitstream, this is likely caused by a missing VOL header\n", ctx->time_increment_bits);
2316 
2317  for (ctx->time_increment_bits = 1;
2318  ctx->time_increment_bits < 16;
2319  ctx->time_increment_bits++) {
2320  if (s->pict_type == AV_PICTURE_TYPE_P ||
2321  (s->pict_type == AV_PICTURE_TYPE_S &&
2322  ctx->vol_sprite_usage == GMC_SPRITE)) {
2323  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2324  break;
2325  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2326  break;
2327  }
2328 
2330  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2331  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2332  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2334  }
2335  }
2336 
2337  if (IS_3IV1)
2338  time_increment = get_bits1(gb); // FIXME investigate further
2339  else
2340  time_increment = get_bits(gb, ctx->time_increment_bits);
2341 
2342  if (s->pict_type != AV_PICTURE_TYPE_B) {
2343  s->last_time_base = s->time_base;
2344  s->time_base += time_incr;
2345  s->time = s->time_base * s->avctx->framerate.num + time_increment;
2346  if (s->workaround_bugs & FF_BUG_UMP4) {
2347  if (s->time < s->last_non_b_time) {
2348  /* header is not mpeg-4-compatible, broken encoder,
2349  * trying to workaround */
2350  s->time_base++;
2351  s->time += s->avctx->framerate.num;
2352  }
2353  }
2354  s->pp_time = s->time - s->last_non_b_time;
2355  s->last_non_b_time = s->time;
2356  } else {
2357  s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2358  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2359  if (s->pp_time <= s->pb_time ||
2360  s->pp_time <= s->pp_time - s->pb_time ||
2361  s->pp_time <= 0) {
2362  /* messed up order, maybe after seeking? skipping current B-frame */
2363  return FRAME_SKIPPED;
2364  }
2366 
2367  if (ctx->t_frame == 0)
2368  ctx->t_frame = s->pb_time;
2369  if (ctx->t_frame == 0)
2370  ctx->t_frame = 1; // 1/0 protection
2371  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2372  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2373  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2374  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2375  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2376  s->pb_field_time = 2;
2377  s->pp_field_time = 4;
2378  if (!s->progressive_sequence)
2379  return FRAME_SKIPPED;
2380  }
2381  }
2382 
2383  if (s->avctx->framerate.den)
2384  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2385  else
2386  pts = AV_NOPTS_VALUE;
2387  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2388 
2389  check_marker(s->avctx, gb, "before vop_coded");
2390 
2391  /* vop coded */
2392  if (get_bits1(gb) != 1) {
2393  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2394  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2395  return FRAME_SKIPPED;
2396  }
2397  if (ctx->new_pred)
2398  decode_new_pred(ctx, gb);
2399 
2400  if (ctx->shape != BIN_ONLY_SHAPE &&
2401  (s->pict_type == AV_PICTURE_TYPE_P ||
2402  (s->pict_type == AV_PICTURE_TYPE_S &&
2403  ctx->vol_sprite_usage == GMC_SPRITE))) {
2404  /* rounding type for motion estimation */
2405  s->no_rounding = get_bits1(gb);
2406  } else {
2407  s->no_rounding = 0;
2408  }
2409  // FIXME reduced res stuff
2410 
2411  if (ctx->shape != RECT_SHAPE) {
2412  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2413  skip_bits(gb, 13); /* width */
2414  check_marker(s->avctx, gb, "after width");
2415  skip_bits(gb, 13); /* height */
2416  check_marker(s->avctx, gb, "after height");
2417  skip_bits(gb, 13); /* hor_spat_ref */
2418  check_marker(s->avctx, gb, "after hor_spat_ref");
2419  skip_bits(gb, 13); /* ver_spat_ref */
2420  }
2421  skip_bits1(gb); /* change_CR_disable */
2422 
2423  if (get_bits1(gb) != 0)
2424  skip_bits(gb, 8); /* constant_alpha_value */
2425  }
2426 
2427  // FIXME complexity estimation stuff
2428 
2429  if (ctx->shape != BIN_ONLY_SHAPE) {
2430  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2431  if (s->pict_type != AV_PICTURE_TYPE_I)
2432  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2433  if (s->pict_type == AV_PICTURE_TYPE_B)
2434  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2435 
2436  if (get_bits_left(gb) < 3) {
2437  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2438  return AVERROR_INVALIDDATA;
2439  }
2440  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2441  if (!s->progressive_sequence) {
2442  s->top_field_first = get_bits1(gb);
2443  s->alternate_scan = get_bits1(gb);
2444  } else
2445  s->alternate_scan = 0;
2446  }
2447 
2448  if (s->alternate_scan) {
2449  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2450  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2451  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2452  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2453  } else {
2454  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2455  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2456  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2457  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2458  }
2459 
2460  if (s->pict_type == AV_PICTURE_TYPE_S &&
2461  (ctx->vol_sprite_usage == STATIC_SPRITE ||
2462  ctx->vol_sprite_usage == GMC_SPRITE)) {
2463  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2464  return AVERROR_INVALIDDATA;
2465  if (ctx->sprite_brightness_change)
2466  av_log(s->avctx, AV_LOG_ERROR,
2467  "sprite_brightness_change not supported\n");
2468  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2469  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2470  }
2471 
2472  if (ctx->shape != BIN_ONLY_SHAPE) {
2473  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2474  if (s->qscale == 0) {
2475  av_log(s->avctx, AV_LOG_ERROR,
2476  "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2477  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2478  }
2479 
2480  if (s->pict_type != AV_PICTURE_TYPE_I) {
2481  s->f_code = get_bits(gb, 3); /* fcode_for */
2482  if (s->f_code == 0) {
2483  av_log(s->avctx, AV_LOG_ERROR,
2484  "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2485  s->f_code = 1;
2486  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2487  }
2488  } else
2489  s->f_code = 1;
2490 
2491  if (s->pict_type == AV_PICTURE_TYPE_B) {
2492  s->b_code = get_bits(gb, 3);
2493  if (s->b_code == 0) {
2494  av_log(s->avctx, AV_LOG_ERROR,
2495  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2496  s->b_code=1;
2497  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2498  }
2499  } else
2500  s->b_code = 1;
2501 
2502  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2503  av_log(s->avctx, AV_LOG_DEBUG,
2504  "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",
2505  s->qscale, s->f_code, s->b_code,
2506  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")),
2507  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2508  s->top_field_first, s->quarter_sample ? "q" : "h",
2509  s->data_partitioning, ctx->resync_marker,
2510  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2511  1 - s->no_rounding, s->vo_type,
2512  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2513  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2514  ctx->cplx_estimation_trash_b,
2515  s->time,
2516  time_increment
2517  );
2518  }
2519 
2520  if (!ctx->scalability) {
2521  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2522  skip_bits1(gb); // vop shape coding type
2523  } else {
2524  if (ctx->enhancement_type) {
2525  int load_backward_shape = get_bits1(gb);
2526  if (load_backward_shape)
2527  av_log(s->avctx, AV_LOG_ERROR,
2528  "load backward shape isn't supported\n");
2529  }
2530  skip_bits(gb, 2); // ref_select_code
2531  }
2532  }
2533  /* detect buggy encoders which don't set the low_delay flag
2534  * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2535  * easily (although it's buggy too) */
2536  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2537  ctx->divx_version == -1 && s->picture_number == 0) {
2538  av_log(s->avctx, AV_LOG_WARNING,
2539  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2540  s->low_delay = 1;
2541  }
2542 
2543  s->picture_number++; // better than pic number==0 always ;)
2544 
2545  // FIXME add short header support
2546  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2547  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2548 
2549  if (s->workaround_bugs & FF_BUG_EDGE) {
2550  s->h_edge_pos = s->width;
2551  s->v_edge_pos = s->height;
2552  }
2553  return 0;
2554 }
2555 
2556 /**
2557  * Decode MPEG-4 headers.
2558  * @return <0 if no VOP found (or a damaged one)
2559  * FRAME_SKIPPED if a not coded VOP is found
2560  * 0 if a VOP is found
2561  */
2563 {
2564  MpegEncContext *s = &ctx->m;
2565  unsigned startcode, v;
2566  int ret;
2567 
2568  /* search next start code */
2569  align_get_bits(gb);
2570 
2571  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2572  skip_bits(gb, 24);
2573  if (get_bits(gb, 8) == 0xF0)
2574  goto end;
2575  }
2576 
2577  startcode = 0xff;
2578  for (;;) {
2579  if (get_bits_count(gb) >= gb->size_in_bits) {
2580  if (gb->size_in_bits == 8 &&
2581  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2582  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2583  return FRAME_SKIPPED; // divx bug
2584  } else
2585  return -1; // end of stream
2586  }
2587 
2588  /* use the bits after the test */
2589  v = get_bits(gb, 8);
2590  startcode = ((startcode << 8) | v) & 0xffffffff;
2591 
2592  if ((startcode & 0xFFFFFF00) != 0x100)
2593  continue; // no startcode
2594 
2595  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2596  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2597  if (startcode <= 0x11F)
2598  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2599  else if (startcode <= 0x12F)
2600  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2601  else if (startcode <= 0x13F)
2602  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2603  else if (startcode <= 0x15F)
2604  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2605  else if (startcode <= 0x1AF)
2606  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2607  else if (startcode == 0x1B0)
2608  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2609  else if (startcode == 0x1B1)
2610  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2611  else if (startcode == 0x1B2)
2612  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2613  else if (startcode == 0x1B3)
2614  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2615  else if (startcode == 0x1B4)
2616  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2617  else if (startcode == 0x1B5)
2618  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2619  else if (startcode == 0x1B6)
2620  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2621  else if (startcode == 0x1B7)
2622  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2623  else if (startcode == 0x1B8)
2624  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2625  else if (startcode == 0x1B9)
2626  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2627  else if (startcode == 0x1BA)
2628  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2629  else if (startcode == 0x1BB)
2630  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2631  else if (startcode == 0x1BC)
2632  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2633  else if (startcode == 0x1BD)
2634  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2635  else if (startcode == 0x1BE)
2636  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2637  else if (startcode == 0x1BF)
2638  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2639  else if (startcode == 0x1C0)
2640  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2641  else if (startcode == 0x1C1)
2642  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2643  else if (startcode == 0x1C2)
2644  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2645  else if (startcode == 0x1C3)
2646  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2647  else if (startcode <= 0x1C5)
2648  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2649  else if (startcode <= 0x1FF)
2650  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2651  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2652  }
2653 
2654  if (startcode >= 0x120 && startcode <= 0x12F) {
2655  if ((ret = decode_vol_header(ctx, gb)) < 0)
2656  return ret;
2657  } else if (startcode == USER_DATA_STARTCODE) {
2658  decode_user_data(ctx, gb);
2659  } else if (startcode == GOP_STARTCODE) {
2660  mpeg4_decode_gop_header(s, gb);
2661  } else if (startcode == VOS_STARTCODE) {
2663  } else if (startcode == VOP_STARTCODE) {
2664  break;
2665  }
2666 
2667  align_get_bits(gb);
2668  startcode = 0xff;
2669  }
2670 
2671 end:
2673  s->low_delay = 1;
2674  s->avctx->has_b_frames = !s->low_delay;
2675 
2676  return decode_vop_header(ctx, gb);
2677 }
2678 
2680  static int done = 0;
2681 
2682  if (!done) {
2689  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2690  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2691  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2692  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2693  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2694  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2695  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2696  &ff_sprite_trajectory_tab[0][1], 4, 2,
2697  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2698  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2699  &ff_mb_type_b_tab[0][1], 2, 1,
2700  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2701  done = 1;
2702  }
2703 }
2704 
2705 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2706 {
2707  Mpeg4DecContext *ctx = avctx->priv_data;
2708  MpegEncContext *s = &ctx->m;
2709 
2710  /* divx 5.01+ bitstream reorder stuff */
2711  /* Since this clobbers the input buffer and hwaccel codecs still need the
2712  * data during hwaccel->end_frame we should not do this any earlier */
2713  if (s->divx_packed) {
2714  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2715  int startcode_found = 0;
2716 
2717  if (buf_size - current_pos > 7) {
2718 
2719  int i;
2720  for (i = current_pos; i < buf_size - 4; i++)
2721 
2722  if (buf[i] == 0 &&
2723  buf[i + 1] == 0 &&
2724  buf[i + 2] == 1 &&
2725  buf[i + 3] == 0xB6) {
2726  startcode_found = !(buf[i + 4] & 0x40);
2727  break;
2728  }
2729  }
2730 
2731  if (startcode_found) {
2732  if (!ctx->showed_packed_warning) {
2733  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2734  "wasteful way to store B-frames ('packed B-frames'). "
2735  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2736  ctx->showed_packed_warning = 1;
2737  }
2740  buf_size - current_pos);
2741  if (!s->bitstream_buffer) {
2742  s->bitstream_buffer_size = 0;
2743  return AVERROR(ENOMEM);
2744  }
2745  memcpy(s->bitstream_buffer, buf + current_pos,
2746  buf_size - current_pos);
2747  s->bitstream_buffer_size = buf_size - current_pos;
2748  }
2749  }
2750 
2751  return 0;
2752 }
2753 
2754 #if HAVE_THREADS
2755 static int mpeg4_update_thread_context(AVCodecContext *dst,
2756  const AVCodecContext *src)
2757 {
2758  Mpeg4DecContext *s = dst->priv_data;
2759  const Mpeg4DecContext *s1 = src->priv_data;
2760  int init = s->m.context_initialized;
2761 
2762  int ret = ff_mpeg_update_thread_context(dst, src);
2763 
2764  if (ret < 0)
2765  return ret;
2766 
2767  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2768 
2769  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2770  ff_xvid_idct_init(&s->m.idsp, dst);
2771 
2772  return 0;
2773 }
2774 #endif
2775 
2777 {
2778  Mpeg4DecContext *ctx = avctx->priv_data;
2779  MpegEncContext *s = &ctx->m;
2780  int ret;
2781 
2782  ctx->divx_version =
2783  ctx->divx_build =
2784  ctx->xvid_build =
2785  ctx->lavc_build = -1;
2786 
2787  if ((ret = ff_h263_decode_init(avctx)) < 0)
2788  return ret;
2789 
2791 
2792  s->h263_pred = 1;
2793  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2795  ctx->time_increment_bits = 4; /* default value for broken headers */
2796 
2798  avctx->internal->allocate_progress = 1;
2799 
2800  return 0;
2801 }
2802 
2803 static const AVOption mpeg4_options[] = {
2804  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2805  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2806  {NULL}
2807 };
2808 
2809 static const AVClass mpeg4_class = {
2810  "MPEG4 Video Decoder",
2812  mpeg4_options,
2814 };
2815 
2817  .name = "mpeg4",
2818  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2819  .type = AVMEDIA_TYPE_VIDEO,
2820  .id = AV_CODEC_ID_MPEG4,
2821  .priv_data_size = sizeof(Mpeg4DecContext),
2822  .init = decode_init,
2823  .close = ff_h263_decode_end,
2828  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2829  .flush = ff_mpeg_flush,
2830  .max_lowres = 3,
2833  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2834  .priv_class = &mpeg4_class,
2835 };
2836 
2837 
2838 #if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
2839 static const AVClass mpeg4_vdpau_class = {
2840  "MPEG4 Video VDPAU Decoder",
2842  mpeg4_options,
2844 };
2845 
2846 AVCodec ff_mpeg4_vdpau_decoder = {
2847  .name = "mpeg4_vdpau",
2848  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2849  .type = AVMEDIA_TYPE_VIDEO,
2850  .id = AV_CODEC_ID_MPEG4,
2851  .priv_data_size = sizeof(Mpeg4DecContext),
2852  .init = decode_init,
2853  .close = ff_h263_decode_end,
2857  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2858  AV_PIX_FMT_NONE },
2859  .priv_class = &mpeg4_vdpau_class,
2860 };
2861 #endif
int bitstream_buffer_size
Definition: mpegvideo.h:414
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:397
uint16_t sprite_traj[4][2]
sprite trajectory points
Definition: mpeg4video.h:75
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:3036
#define ff_tlog(ctx,...)
Definition: internal.h:65
IDCTDSPContext idsp
Definition: mpegvideo.h:227
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3429
#define MB_TYPE_SKIP
Definition: avcodec.h:1302
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2741
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
int aspect_ratio_info
Definition: mpegvideo.h:400
int picture_number
Definition: mpegvideo.h:124
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2921
ScanTable intra_v_scantable
Definition: mpegvideo.h:90
static int shift(int a, int b)
Definition: sonic.c:82
S(GMC)-VOP MPEG-4.
Definition: avutil.h:277
RLTable ff_mpeg4_rl_intra
Definition: mpeg4data.h:109
const uint8_t ff_mpeg4_c_dc_scale_table[32]
Definition: mpeg4data.h:363
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
Definition: pixfmt.h:500
#define CBPY_VLC_BITS
Definition: h263.h:41
AVOption.
Definition: opt.h:246
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:269
static void flush(AVCodecContext *avctx)
int sprite_warping_accuracy
Definition: mpegvideo.h:401
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG-1 & B-frame MPEG-4
Definition: mpegvideo.h:278
av_cold void ff_mpeg4videodec_static_init(void)
float re
Definition: fft.c:82
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:504
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:204
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:45
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
int resync_marker
could this stream contain resync markers
Definition: mpeg4video.h:82
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:75
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
int16_t(*[3] ac_val)[16]
used for MPEG-4 AC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:191
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:167
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:407
int num
Numerator.
Definition: rational.h:59
uint8_t * bitstream_buffer
Definition: mpegvideo.h:413
enum AVCodecID codec_id
Definition: mpegvideo.h:109
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:3035
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:37
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2933
const uint8_t * buffer
Definition: get_bits.h:56
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:63
int av_log2(unsigned v)
Definition: intmath.c:26
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:2143
static av_cold int decode_init(AVCodecContext *avctx)
#define MB_TYPE_INTRA
Definition: mpegutils.h:75
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:121
int real_sprite_warping_points
Definition: mpegvideo.h:394
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:3029
mpegvideo header.
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1937
#define DC_VLC_BITS
Definition: mpeg4videodec.c:44
#define DC_MARKER
Definition: mpeg4video.h:54
uint8_t permutated[64]
Definition: idctdsp.h:33
uint8_t run
Definition: svq3.c:206
#define ER_MV_ERROR
int padding_bug_score
used to detect the VERY common padding bug in MPEG-4
Definition: mpegvideo.h:409
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:501
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:130
#define src
Definition: vp8dsp.c:254
int profile
profile
Definition: avcodec.h:3235
AVCodec.
Definition: avcodec.h:3681
int time_base
time in seconds of last I,P,S Frame
Definition: mpegvideo.h:387
RLTable.
Definition: rl.h:39
int qscale
QP.
Definition: mpegvideo.h:201
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
const AVProfile ff_mpeg4_video_profiles[]
Definition: profiles.c:107
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:307
int field_select[2][2]
Definition: mpegvideo.h:277
int block_wrap[6]
Definition: mpegvideo.h:294
int quant_precision
Definition: mpegvideo.h:398
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:2433
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1869
int vol_sprite_usage
Definition: mpeg4video.h:71
static int16_t block[64]
Definition: dct.c:115
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
#define AV_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:1022
#define USES_LIST(a, list)
Definition: mpegutils.h:101
#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:359
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:47
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (MPEG-4) ...
Definition: mpegvideo.h:264
uint8_t bits
Definition: crc.c:296
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
float delta
AVOptions.
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2974
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:90
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
#define IS_3IV1
Definition: mpeg4video.h:170
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:197
Multithreading support functions.
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:916
#define FF_BUG_EDGE
Definition: avcodec.h:2932
int interlaced_dct
Definition: mpegvideo.h:481
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:177
#define CHROMA_420
Definition: mpegvideo.h:473
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
#define RECT_SHAPE
Definition: mpeg4video.h:33
#define height
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:2930
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2929
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:46
#define AV_CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:1033
#define ER_MV_END
#define ff_dlog(a,...)
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:330
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:126
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:117
int intra_dc_threshold
QP above which the ac VLC should be used for intra dc.
Definition: mpeg4video.h:92
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2476
#define MAX_LEVEL
Definition: rl.h:36
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:180
#define FF_BUG_IEDGE
Definition: avcodec.h:2937
#define av_log(a,...)
#define MOTION_MARKER
Definition: mpeg4video.h:53
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:731
#define FF_IDCT_AUTO
Definition: avcodec.h:3092
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2804
MpegEncContext m
Definition: mpeg4video.h:66
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:395
#define ROUNDED_DIV(a, b)
Definition: common.h:56
ThreadFrame tf
Definition: mpegpicture.h:47
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2931
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:587
#define FF_IDCT_XVID
Definition: avcodec.h:3105
int16_t * dc_val[3]
used for MPEG-4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:184
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:160
static double alpha(void *priv, double x, double y)
Definition: vf_geq.c:99
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:2054
uint8_t * mbskip_table
Definition: mpegpicture.h:59
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:192
av_default_item_name
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:403
#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:179
ERContext er
Definition: mpegvideo.h:551
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
const char * r
Definition: vf_curves.c:111
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1827
#define SIMPLE_VO_TYPE
Definition: mpeg4video.h:38
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:40
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2923
#define FF_DEBUG_BUGS
Definition: avcodec.h:2993
GLsizei GLsizei * length
Definition: opengl_enc.c:115
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:71
const char * name
Name of the codec implementation.
Definition: avcodec.h:3688
#define IS_SKIP(a)
Definition: mpegutils.h:83
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:399
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:404
#define SET_QPEL_FUNC(postfix1, postfix2)
GetBitContext gb
Definition: mpegvideo.h:446
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:500
#define CLOSE_READER(name, gb)
Definition: get_bits.h:131
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1060
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
Definition: get_bits.h:509
Definition: vlc.h:26
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2773
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:175
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:218
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:356
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideodata.c:89
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:62
common internal API header
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:396
#define ADV_SIMPLE_VO_TYPE
Definition: mpeg4video.h:44
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:1301
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:99
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:409
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:991
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:51
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:3020
#define MB_TYPE_DIRECT2
Definition: avcodec.h:1299
#define FFMIN(a, b)
Definition: common.h:96
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
#define IS_DIRECT(a)
Definition: mpegutils.h:86
static VLC dc_lum
Definition: mpeg4videodec.c:47
#define width
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:3091
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
#define MB_TYPE_INTERLACED
Definition: avcodec.h:1298
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
#define GRAY_SHAPE
Definition: mpeg4video.h:36
#define ER_DC_END
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:721
AVCodec ff_mpeg4_decoder
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:415
int size_in_bits
Definition: get_bits.h:58
AVFormatContext * ctx
Definition: movenc.c:48
int use_intra_dc_vlc
Definition: mpeg4video.h:89
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:296
#define MB_TYPE_L0L1
Definition: avcodec.h:1309
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
int level
level
Definition: avcodec.h:3333
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:181
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:554
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:83
int n
Definition: avisynth_c.h:684
#define MB_TYPE_ACPRED
Definition: avcodec.h:1300
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:96
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1878
#define MB_TYPE_L1
Definition: avcodec.h:1308
int vol_control_parameters
does the stream contain the low_delay flag, used to work around buggy encoders.
Definition: mpeg4video.h:104
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:348
#define FRAME_SKIPPED
Return value for header parsers if frame is not coded.
Definition: mpegutils.h:34
uint8_t * mbintra_table
used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
Definition: mpegvideo.h:195
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2928
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:483
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:193
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:43
#define FF_BUG_UMP4
Definition: avcodec.h:2922
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:293
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:434
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:263
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
BlockDSPContext bdsp
Definition: mpegvideo.h:223
int debug
debug
Definition: avcodec.h:2973
main external API structure.
Definition: avcodec.h:1732
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define FASTDIV(a, b)
Definition: mathops.h:202
#define RSHIFT(a, b)
Definition: common.h:54
ScanTable intra_scantable
Definition: mpegvideo.h:88
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
static int get_xbits(GetBitContext *s, int n)
Read MPEG-1 dc-style VLC (sign bit + mantissa with no MSB).
Definition: get_bits.h:218
#define OPEN_READER(name, gb)
Definition: get_bits.h:120
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:39
void * buf
Definition: avisynth_c.h:690
MPEG-4 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstr...
Definition: pixfmt.h:146
#define SLICE_END
end marker found
Definition: mpegvideo.h:503
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:402
int showed_packed_warning
flag for having shown the warning about invalid Divx B-frames
Definition: mpeg4video.h:101
int progressive_sequence
Definition: mpegvideo.h:454
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:313
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:338
Describe the class of an AVClass context structure.
Definition: log.h:67
ScanTable intra_h_scantable
Definition: mpegvideo.h:89
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:306
static const AVProfile profiles[]
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:196
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode MPEG-4 headers.
int context_initialized
Definition: mpegvideo.h:121
#define GET_CACHE(name, gb)
Definition: get_bits.h:197
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:3033
#define MB_TYPE_16x16
Definition: avcodec.h:1294
RLTable ff_h263_rl_inter
Definition: h263data.c:161
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
#define s1
Definition: regdef.h:38
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:162
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:136
int f_code
forward MV resolution
Definition: mpegvideo.h:235
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:346
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:77
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:998
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2917
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:102
static int64_t pts
Global timestamp for the audio frames.
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
uint8_t level
Definition: svq3.c:207
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:276
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:128
MpegEncContext.
Definition: mpegvideo.h:78
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:180
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
int8_t * qscale_table
Definition: mpegpicture.h:50
#define MAX_RUN
Definition: rl.h:35
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
static int mpeg4_is_resync(Mpeg4DecContext *ctx)
check if the next stuff is a resync marker or the end.
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:194
static VLC sprite_trajectory
Definition: mpeg4videodec.c:48
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
#define FF_BUG_AMV
Definition: avcodec.h:2924
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:127
if(ret< 0)
Definition: vf_mcdeint.c:282
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:60
#define TEX_VLC_BITS
Definition: dv.h:93
static VLC dc_chrom
Definition: mpeg4videodec.c:47
#define MB_TYPE_8x8
Definition: avcodec.h:1297
Bi-dir predicted.
Definition: avutil.h:276
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:49
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
int den
Denominator.
Definition: rational.h:60
const uint8_t ff_alternate_vertical_scan[64]
#define MB_TYPE_16x8
Definition: avcodec.h:1295
static const AVClass mpeg4_class
#define IS_INTRA(x, y)
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:149
void * priv_data
Definition: avcodec.h:1774
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2987
#define IS_8X8(a)
Definition: mpegutils.h:91
int len
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1782
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:357
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:498
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:165
#define IS_ACPRED(a)
Definition: mpegutils.h:96
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:464
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
int chroma_qscale
chroma QP
Definition: mpegvideo.h:202
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_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:255
#define av_uninit(x)
Definition: attributes.h:148
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:69
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:116
int num_sprite_warping_points
Definition: mpeg4video.h:73
#define stride
#define MV_TYPE_8X8
4 vectors (H.263, MPEG-4 4MV)
Definition: mpegvideo.h:267
int b_code
backward MV resolution for B-frames (MPEG-4)
Definition: mpegvideo.h:236
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2934
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
const uint8_t ff_mb_type_b_tab[4][2]
Definition: mpeg4data.h:332
static int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block, int n, int coded, int intra, int rvlc)
Decode a block.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:997
for(j=16;j >0;--j)
#define MB_TYPE_L0
Definition: avcodec.h:1307
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
Predicted.
Definition: avutil.h:275
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:39
#define GOP_STARTCODE
Definition: mpeg4video.h:58
#define VOS_STARTCODE
Definition: mpeg4video.h:56
#define GMC_SPRITE
Definition: mpeg4video.h:51