FFmpeg  4.4.5
mpeg4videodec.c
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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 "libavutil/pixdesc.h"
28 #include "libavutil/thread.h"
29 #include "error_resilience.h"
30 #include "hwconfig.h"
31 #include "idctdsp.h"
32 #include "internal.h"
33 #include "mpegutils.h"
34 #include "mpegvideo.h"
35 #include "mpegvideodata.h"
36 #include "mpeg4video.h"
37 #include "h263.h"
38 #include "profiles.h"
39 #include "thread.h"
40 #include "xvididct.h"
41 #include "unary.h"
42 
43 /* The defines below define the number of bits that are read at once for
44  * reading vlc values. Changing these may improve speed and data cache needs
45  * be aware though that decreasing them may need the number of stages that is
46  * passed to get_vlc* to be increased. */
47 #define SPRITE_TRAJ_VLC_BITS 6
48 #define DC_VLC_BITS 9
49 #define MB_TYPE_B_VLC_BITS 4
50 #define STUDIO_INTRA_BITS 9
51 
55 static VLC studio_intra_tab[12];
58 
59 static const int mb_type_b_map[4] = {
64 };
65 
66 /**
67  * Predict the ac.
68  * @param n block index (0-3 are luma, 4-5 are chroma)
69  * @param dir the ac prediction direction
70  */
71 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
72 {
73  int i;
74  int16_t *ac_val, *ac_val1;
75  int8_t *const qscale_table = s->current_picture.qscale_table;
76 
77  /* find prediction */
78  ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
79  ac_val1 = ac_val;
80  if (s->ac_pred) {
81  if (dir == 0) {
82  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
83  /* left prediction */
84  ac_val -= 16;
85 
86  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
87  n == 1 || n == 3) {
88  /* same qscale */
89  for (i = 1; i < 8; i++)
90  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
91  } else {
92  /* different qscale, we must rescale */
93  for (i = 1; i < 8; i++)
94  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
95  }
96  } else {
97  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
98  /* top prediction */
99  ac_val -= 16 * s->block_wrap[n];
100 
101  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
102  n == 2 || n == 3) {
103  /* same qscale */
104  for (i = 1; i < 8; i++)
105  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
106  } else {
107  /* different qscale, we must rescale */
108  for (i = 1; i < 8; i++)
109  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
110  }
111  }
112  }
113  /* left copy */
114  for (i = 1; i < 8; i++)
115  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
116 
117  /* top copy */
118  for (i = 1; i < 8; i++)
119  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
120 }
121 
122 /**
123  * check if the next stuff is a resync marker or the end.
124  * @return 0 if not
125  */
127 {
128  MpegEncContext *s = &ctx->m;
129  int bits_count = get_bits_count(&s->gb);
130  int v = show_bits(&s->gb, 16);
131 
132  if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
133  return 0;
134 
135  while (v <= 0xFF) {
136  if (s->pict_type == AV_PICTURE_TYPE_B ||
137  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
138  break;
139  skip_bits(&s->gb, 8 + s->pict_type);
140  bits_count += 8 + s->pict_type;
141  v = show_bits(&s->gb, 16);
142  }
143 
144  if (bits_count + 8 >= s->gb.size_in_bits) {
145  v >>= 8;
146  v |= 0x7F >> (7 - (bits_count & 7));
147 
148  if (v == 0x7F)
149  return s->mb_num;
150  } else {
151  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
152  int len, mb_num;
153  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
154  GetBitContext gb = s->gb;
155 
156  skip_bits(&s->gb, 1);
157  align_get_bits(&s->gb);
158 
159  for (len = 0; len < 32; len++)
160  if (get_bits1(&s->gb))
161  break;
162 
163  mb_num = get_bits(&s->gb, mb_num_bits);
164  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
165  mb_num= -1;
166 
167  s->gb = gb;
168 
170  return mb_num;
171  }
172  }
173  return 0;
174 }
175 
177 {
178  MpegEncContext *s = &ctx->m;
179  int a = 2 << s->sprite_warping_accuracy;
180  int rho = 3 - s->sprite_warping_accuracy;
181  int r = 16 / a;
182  int alpha = 1;
183  int beta = 0;
184  int w = s->width;
185  int h = s->height;
186  int min_ab, i, w2, h2, w3, h3;
187  int sprite_ref[4][2];
188  int virtual_ref[2][2];
189  int64_t sprite_offset[2][2];
190  int64_t sprite_delta[2][2];
191 
192  // only true for rectangle shapes
193  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
194  { 0, s->height }, { s->width, s->height } };
195  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
196 
197  if (w <= 0 || h <= 0)
198  return AVERROR_INVALIDDATA;
199 
200  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
201  int length;
202  int x = 0, y = 0;
203 
205  if (length > 0)
206  x = get_xbits(gb, length);
207 
208  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
209  check_marker(s->avctx, gb, "before sprite_trajectory");
210 
212  if (length > 0)
213  y = get_xbits(gb, length);
214 
215  check_marker(s->avctx, gb, "after sprite_trajectory");
216  ctx->sprite_traj[i][0] = d[i][0] = x;
217  ctx->sprite_traj[i][1] = d[i][1] = y;
218  }
219  for (; i < 4; i++)
220  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
221 
222  while ((1 << alpha) < w)
223  alpha++;
224  while ((1 << beta) < h)
225  beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
226  w2 = 1 << alpha;
227  h2 = 1 << beta;
228 
229  // Note, the 4th point isn't used for GMC
230  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
231  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
232  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
233  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
234  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
235  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
236  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
237  } else {
238  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
239  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
240  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
241  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
242  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
243  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
244  }
245  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
246  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
247 
248  /* This is mostly identical to the MPEG-4 std (and is totally unreadable
249  * because of that...). Perhaps it should be reordered to be more readable.
250  * The idea behind this virtual_ref mess is to be able to use shifts later
251  * per pixel instead of divides so the distance between points is converted
252  * from w&h based to w2&h2 based which are of the 2^x form. */
253  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
254  ROUNDED_DIV(((w - w2) *
255  (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
256  w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
257  virtual_ref[0][1] = 16 * vop_ref[0][1] +
258  ROUNDED_DIV(((w - w2) *
259  (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
260  w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
261  virtual_ref[1][0] = 16 * vop_ref[0][0] +
262  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
263  h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
264  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
265  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
266  h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
267 
268  switch (ctx->num_sprite_warping_points) {
269  case 0:
270  sprite_offset[0][0] =
271  sprite_offset[0][1] =
272  sprite_offset[1][0] =
273  sprite_offset[1][1] = 0;
274  sprite_delta[0][0] = a;
275  sprite_delta[0][1] =
276  sprite_delta[1][0] = 0;
277  sprite_delta[1][1] = a;
278  ctx->sprite_shift[0] =
279  ctx->sprite_shift[1] = 0;
280  break;
281  case 1: // GMC only
282  sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
283  sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
284  sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
285  a * (vop_ref[0][0] / 2);
286  sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
287  a * (vop_ref[0][1] / 2);
288  sprite_delta[0][0] = a;
289  sprite_delta[0][1] =
290  sprite_delta[1][0] = 0;
291  sprite_delta[1][1] = a;
292  ctx->sprite_shift[0] =
293  ctx->sprite_shift[1] = 0;
294  break;
295  case 2:
296  sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
297  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
298  ((int64_t) -vop_ref[0][0]) +
299  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
300  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
301  sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
302  ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
303  ((int64_t) -vop_ref[0][0]) +
304  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
305  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
306  sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
307  ((int64_t)-2 * vop_ref[0][0] + 1) +
308  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
309  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
310  (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
311  sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
312  ((int64_t)-2 * vop_ref[0][0] + 1) +
313  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
314  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
315  (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
316  sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
317  sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
318  sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
319  sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
320 
321  ctx->sprite_shift[0] = alpha + rho;
322  ctx->sprite_shift[1] = alpha + rho + 2;
323  break;
324  case 3:
325  min_ab = FFMIN(alpha, beta);
326  w3 = w2 >> min_ab;
327  h3 = h2 >> min_ab;
328  sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
329  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
330  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
331  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
332  sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
333  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
334  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
335  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
336  sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
337  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
338  (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
339  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
340  sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
341  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
342  (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
343  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
344  sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
345  sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
346  sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
347  sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
348 
349  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
350  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
351  break;
352  default:
353  av_assert0(0);
354  }
355  /* try to simplify the situation */
356  if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
357  sprite_delta[0][1] == 0 &&
358  sprite_delta[1][0] == 0 &&
359  sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
360  sprite_offset[0][0] >>= ctx->sprite_shift[0];
361  sprite_offset[0][1] >>= ctx->sprite_shift[0];
362  sprite_offset[1][0] >>= ctx->sprite_shift[1];
363  sprite_offset[1][1] >>= ctx->sprite_shift[1];
364  sprite_delta[0][0] = a;
365  sprite_delta[0][1] = 0;
366  sprite_delta[1][0] = 0;
367  sprite_delta[1][1] = a;
368  ctx->sprite_shift[0] = 0;
369  ctx->sprite_shift[1] = 0;
370  s->real_sprite_warping_points = 1;
371  } else {
372  int shift_y = 16 - ctx->sprite_shift[0];
373  int shift_c = 16 - ctx->sprite_shift[1];
374 
375  for (i = 0; i < 2; i++) {
376  if (shift_c < 0 || shift_y < 0 ||
377  FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
378  FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
379  FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
380  FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
381  ) {
382  avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
383  goto overflow;
384  }
385  }
386 
387  for (i = 0; i < 2; i++) {
388  sprite_offset[0][i] *= 1 << shift_y;
389  sprite_offset[1][i] *= 1 << shift_c;
390  sprite_delta[0][i] *= 1 << shift_y;
391  sprite_delta[1][i] *= 1 << shift_y;
392  ctx->sprite_shift[i] = 16;
393 
394  }
395  for (i = 0; i < 2; i++) {
396  int64_t sd[2] = {
397  sprite_delta[i][0] - a * (1LL<<16),
398  sprite_delta[i][1] - a * (1LL<<16)
399  };
400 
401  if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
402  llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
403  llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
404  llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
405  llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
406  llabs(sd[0]) >= INT_MAX ||
407  llabs(sd[1]) >= INT_MAX ||
408  llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
409  llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
410  llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
411  ) {
412  avpriv_request_sample(s->avctx, "Overflow on sprite points");
413  goto overflow;
414  }
415  }
416  s->real_sprite_warping_points = ctx->num_sprite_warping_points;
417  }
418 
419  for (i = 0; i < 4; i++) {
420  s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
421  s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
422  }
423 
424  return 0;
425 overflow:
426  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
427  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
428  return AVERROR_PATCHWELCOME;
429 }
430 
432  MpegEncContext *s = &ctx->m;
433  int len = FFMIN(ctx->time_increment_bits + 3, 15);
434 
435  get_bits(gb, len);
436  if (get_bits1(gb))
437  get_bits(gb, len);
438  check_marker(s->avctx, gb, "after new_pred");
439 
440  return 0;
441 }
442 
443 /**
444  * Decode the next video packet.
445  * @return <0 if something went wrong
446  */
448 {
449  MpegEncContext *s = &ctx->m;
450 
451  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
452  int header_extension = 0, mb_num, len;
453 
454  /* is there enough space left for a video packet + header */
455  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
456  return AVERROR_INVALIDDATA;
457 
458  for (len = 0; len < 32; len++)
459  if (get_bits1(&s->gb))
460  break;
461 
463  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
464  return AVERROR_INVALIDDATA;
465  }
466 
467  if (ctx->shape != RECT_SHAPE) {
468  header_extension = get_bits1(&s->gb);
469  // FIXME more stuff here
470  }
471 
472  mb_num = get_bits(&s->gb, mb_num_bits);
473  if (mb_num >= s->mb_num || !mb_num) {
474  av_log(s->avctx, AV_LOG_ERROR,
475  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
476  return AVERROR_INVALIDDATA;
477  }
478 
479  s->mb_x = mb_num % s->mb_width;
480  s->mb_y = mb_num / s->mb_width;
481 
482  if (ctx->shape != BIN_ONLY_SHAPE) {
483  int qscale = get_bits(&s->gb, s->quant_precision);
484  if (qscale)
485  s->chroma_qscale = s->qscale = qscale;
486  }
487 
488  if (ctx->shape == RECT_SHAPE)
489  header_extension = get_bits1(&s->gb);
490 
491  if (header_extension) {
492  int time_incr = 0;
493 
494  while (get_bits1(&s->gb) != 0)
495  time_incr++;
496 
497  check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
498  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
499  check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
500 
501  skip_bits(&s->gb, 2); /* vop coding type */
502  // FIXME not rect stuff here
503 
504  if (ctx->shape != BIN_ONLY_SHAPE) {
505  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
506  // FIXME don't just ignore everything
507  if (s->pict_type == AV_PICTURE_TYPE_S &&
508  ctx->vol_sprite_usage == GMC_SPRITE) {
509  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
510  return AVERROR_INVALIDDATA;
511  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
512  }
513 
514  // FIXME reduced res stuff here
515 
516  if (s->pict_type != AV_PICTURE_TYPE_I) {
517  int f_code = get_bits(&s->gb, 3); /* fcode_for */
518  if (f_code == 0)
519  av_log(s->avctx, AV_LOG_ERROR,
520  "Error, video packet header damaged (f_code=0)\n");
521  }
522  if (s->pict_type == AV_PICTURE_TYPE_B) {
523  int b_code = get_bits(&s->gb, 3);
524  if (b_code == 0)
525  av_log(s->avctx, AV_LOG_ERROR,
526  "Error, video packet header damaged (b_code=0)\n");
527  }
528  }
529  }
530  if (ctx->new_pred)
531  decode_new_pred(ctx, &s->gb);
532 
533  return 0;
534 }
535 
537 {
538  /* Reset DC Predictors */
539  s->last_dc[0] =
540  s->last_dc[1] =
541  s->last_dc[2] = 1 << (s->avctx->bits_per_raw_sample + s->dct_precision + s->intra_dc_precision - 1);
542 }
543 
544 /**
545  * Decode the next video packet.
546  * @return <0 if something went wrong
547  */
549 {
550  MpegEncContext *s = &ctx->m;
551  GetBitContext *gb = &s->gb;
552  unsigned vlc_len;
553  uint16_t mb_num;
554 
555  if (get_bits_left(gb) >= 32 && get_bits_long(gb, 32) == SLICE_START_CODE) {
556  vlc_len = av_log2(s->mb_width * s->mb_height) + 1;
557  mb_num = get_bits(gb, vlc_len);
558 
559  if (mb_num >= s->mb_num)
560  return AVERROR_INVALIDDATA;
561 
562  s->mb_x = mb_num % s->mb_width;
563  s->mb_y = mb_num / s->mb_width;
564 
565  if (ctx->shape != BIN_ONLY_SHAPE)
566  s->qscale = mpeg_get_qscale(s);
567 
568  if (get_bits1(gb)) { /* slice_extension_flag */
569  skip_bits1(gb); /* intra_slice */
570  skip_bits1(gb); /* slice_VOP_id_enable */
571  skip_bits(gb, 6); /* slice_VOP_id */
572  while (get_bits1(gb)) /* extra_bit_slice */
573  skip_bits(gb, 8); /* extra_information_slice */
574  }
575 
577  }
578  else {
579  return AVERROR_INVALIDDATA;
580  }
581 
582  return 0;
583 }
584 
585 /**
586  * Get the average motion vector for a GMC MB.
587  * @param n either 0 for the x component or 1 for y
588  * @return the average MV for a GMC MB
589  */
590 static inline int get_amv(Mpeg4DecContext *ctx, int n)
591 {
592  MpegEncContext *s = &ctx->m;
593  int x, y, mb_v, sum, dx, dy, shift;
594  int len = 1 << (s->f_code + 4);
595  const int a = s->sprite_warping_accuracy;
596 
597  if (s->workaround_bugs & FF_BUG_AMV)
598  len >>= s->quarter_sample;
599 
600  if (s->real_sprite_warping_points == 1) {
601  if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
602  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
603  else
604  sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
605  } else {
606  dx = s->sprite_delta[n][0];
607  dy = s->sprite_delta[n][1];
608  shift = ctx->sprite_shift[0];
609  if (n)
610  dy -= 1 << (shift + a + 1);
611  else
612  dx -= 1 << (shift + a + 1);
613  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16U + dy * s->mb_y * 16U;
614 
615  sum = 0;
616  for (y = 0; y < 16; y++) {
617  int v;
618 
619  v = mb_v + (unsigned)dy * y;
620  // FIXME optimize
621  for (x = 0; x < 16; x++) {
622  sum += v >> shift;
623  v += dx;
624  }
625  }
626  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
627  }
628 
629  if (sum < -len)
630  sum = -len;
631  else if (sum >= len)
632  sum = len - 1;
633 
634  return sum;
635 }
636 
637 /**
638  * Decode the dc value.
639  * @param n block index (0-3 are luma, 4-5 are chroma)
640  * @param dir_ptr the prediction direction will be stored here
641  * @return the quantized dc
642  */
643 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
644 {
645  int level, code;
646 
647  if (n < 4)
648  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
649  else
650  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
651 
652  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
653  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
654  return AVERROR_INVALIDDATA;
655  }
656 
657  if (code == 0) {
658  level = 0;
659  } else {
660  if (IS_3IV1) {
661  if (code == 1)
662  level = 2 * get_bits1(&s->gb) - 1;
663  else {
664  if (get_bits1(&s->gb))
665  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
666  else
667  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
668  }
669  } else {
670  level = get_xbits(&s->gb, code);
671  }
672 
673  if (code > 8) {
674  if (get_bits1(&s->gb) == 0) { /* marker */
675  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
676  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
677  return AVERROR_INVALIDDATA;
678  }
679  }
680  }
681  }
682 
683  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
684 }
685 
686 /**
687  * Decode first partition.
688  * @return number of MBs decoded or <0 if an error occurred
689  */
691 {
692  MpegEncContext *s = &ctx->m;
693  int mb_num = 0;
694  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
695 
696  /* decode first partition */
697  s->first_slice_line = 1;
698  for (; s->mb_y < s->mb_height; s->mb_y++) {
700  for (; s->mb_x < s->mb_width; s->mb_x++) {
701  const int xy = s->mb_x + s->mb_y * s->mb_stride;
702  int cbpc;
703  int dir = 0;
704 
705  mb_num++;
707  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
708  s->first_slice_line = 0;
709 
710  if (s->pict_type == AV_PICTURE_TYPE_I) {
711  int i;
712 
713  do {
714  if (show_bits(&s->gb, 19) == DC_MARKER)
715  return mb_num - 1;
716 
718  if (cbpc < 0) {
719  av_log(s->avctx, AV_LOG_ERROR,
720  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
721  return AVERROR_INVALIDDATA;
722  }
723  } while (cbpc == 8);
724 
725  s->cbp_table[xy] = cbpc & 3;
726  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
727  s->mb_intra = 1;
728 
729  if (cbpc & 4)
730  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
731 
732  s->current_picture.qscale_table[xy] = s->qscale;
733 
734  s->mbintra_table[xy] = 1;
735  for (i = 0; i < 6; i++) {
736  int dc_pred_dir;
737  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
738  if (dc < 0) {
739  av_log(s->avctx, AV_LOG_ERROR,
740  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
741  return dc;
742  }
743  dir <<= 1;
744  if (dc_pred_dir)
745  dir |= 1;
746  }
747  s->pred_dir_table[xy] = dir;
748  } else { /* P/S_TYPE */
749  int mx, my, pred_x, pred_y, bits;
750  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
751  const int stride = s->b8_stride * 2;
752 
753 try_again:
754  bits = show_bits(&s->gb, 17);
755  if (bits == MOTION_MARKER)
756  return mb_num - 1;
757 
758  skip_bits1(&s->gb);
759  if (bits & 0x10000) {
760  /* skip mb */
761  if (s->pict_type == AV_PICTURE_TYPE_S &&
762  ctx->vol_sprite_usage == GMC_SPRITE) {
763  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
764  MB_TYPE_16x16 |
765  MB_TYPE_GMC |
766  MB_TYPE_L0;
767  mx = get_amv(ctx, 0);
768  my = get_amv(ctx, 1);
769  } else {
770  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
771  MB_TYPE_16x16 |
772  MB_TYPE_L0;
773  mx = my = 0;
774  }
775  mot_val[0] =
776  mot_val[2] =
777  mot_val[0 + stride] =
778  mot_val[2 + stride] = mx;
779  mot_val[1] =
780  mot_val[3] =
781  mot_val[1 + stride] =
782  mot_val[3 + stride] = my;
783 
784  if (s->mbintra_table[xy])
786  continue;
787  }
788 
790  if (cbpc < 0) {
791  av_log(s->avctx, AV_LOG_ERROR,
792  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
793  return AVERROR_INVALIDDATA;
794  }
795  if (cbpc == 20)
796  goto try_again;
797 
798  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
799 
800  s->mb_intra = ((cbpc & 4) != 0);
801 
802  if (s->mb_intra) {
803  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
804  s->mbintra_table[xy] = 1;
805  mot_val[0] =
806  mot_val[2] =
807  mot_val[0 + stride] =
808  mot_val[2 + stride] = 0;
809  mot_val[1] =
810  mot_val[3] =
811  mot_val[1 + stride] =
812  mot_val[3 + stride] = 0;
813  } else {
814  if (s->mbintra_table[xy])
816 
817  if (s->pict_type == AV_PICTURE_TYPE_S &&
818  ctx->vol_sprite_usage == GMC_SPRITE &&
819  (cbpc & 16) == 0)
820  s->mcsel = get_bits1(&s->gb);
821  else
822  s->mcsel = 0;
823 
824  if ((cbpc & 16) == 0) {
825  /* 16x16 motion prediction */
826 
827  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
828  if (!s->mcsel) {
829  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
830  if (mx >= 0xffff)
831  return AVERROR_INVALIDDATA;
832 
833  my = ff_h263_decode_motion(s, pred_y, s->f_code);
834  if (my >= 0xffff)
835  return AVERROR_INVALIDDATA;
836  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
837  MB_TYPE_L0;
838  } else {
839  mx = get_amv(ctx, 0);
840  my = get_amv(ctx, 1);
841  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
842  MB_TYPE_GMC |
843  MB_TYPE_L0;
844  }
845 
846  mot_val[0] =
847  mot_val[2] =
848  mot_val[0 + stride] =
849  mot_val[2 + stride] = mx;
850  mot_val[1] =
851  mot_val[3] =
852  mot_val[1 + stride] =
853  mot_val[3 + stride] = my;
854  } else {
855  int i;
856  s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
857  MB_TYPE_L0;
858  for (i = 0; i < 4; i++) {
859  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
860  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
861  if (mx >= 0xffff)
862  return AVERROR_INVALIDDATA;
863 
864  my = ff_h263_decode_motion(s, pred_y, s->f_code);
865  if (my >= 0xffff)
866  return AVERROR_INVALIDDATA;
867  mot_val[0] = mx;
868  mot_val[1] = my;
869  }
870  }
871  }
872  }
873  }
874  s->mb_x = 0;
875  }
876 
877  return mb_num;
878 }
879 
880 /**
881  * decode second partition.
882  * @return <0 if an error occurred
883  */
884 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
885 {
886  int mb_num = 0;
887  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
888 
889  s->mb_x = s->resync_mb_x;
890  s->first_slice_line = 1;
891  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
893  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
894  const int xy = s->mb_x + s->mb_y * s->mb_stride;
895 
896  mb_num++;
898  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
899  s->first_slice_line = 0;
900 
901  if (s->pict_type == AV_PICTURE_TYPE_I) {
902  int ac_pred = get_bits1(&s->gb);
903  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
904  if (cbpy < 0) {
905  av_log(s->avctx, AV_LOG_ERROR,
906  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
907  return AVERROR_INVALIDDATA;
908  }
909 
910  s->cbp_table[xy] |= cbpy << 2;
911  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
912  } else { /* P || S_TYPE */
913  if (IS_INTRA(s->current_picture.mb_type[xy])) {
914  int i;
915  int dir = 0;
916  int ac_pred = get_bits1(&s->gb);
917  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
918 
919  if (cbpy < 0) {
920  av_log(s->avctx, AV_LOG_ERROR,
921  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
922  return AVERROR_INVALIDDATA;
923  }
924 
925  if (s->cbp_table[xy] & 8)
926  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
927  s->current_picture.qscale_table[xy] = s->qscale;
928 
929  for (i = 0; i < 6; i++) {
930  int dc_pred_dir;
931  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
932  if (dc < 0) {
933  av_log(s->avctx, AV_LOG_ERROR,
934  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
935  return dc;
936  }
937  dir <<= 1;
938  if (dc_pred_dir)
939  dir |= 1;
940  }
941  s->cbp_table[xy] &= 3; // remove dquant
942  s->cbp_table[xy] |= cbpy << 2;
943  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
944  s->pred_dir_table[xy] = dir;
945  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
946  s->current_picture.qscale_table[xy] = s->qscale;
947  s->cbp_table[xy] = 0;
948  } else {
949  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
950 
951  if (cbpy < 0) {
952  av_log(s->avctx, AV_LOG_ERROR,
953  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
954  return AVERROR_INVALIDDATA;
955  }
956 
957  if (s->cbp_table[xy] & 8)
958  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
959  s->current_picture.qscale_table[xy] = s->qscale;
960 
961  s->cbp_table[xy] &= 3; // remove dquant
962  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
963  }
964  }
965  }
966  if (mb_num >= mb_count)
967  return 0;
968  s->mb_x = 0;
969  }
970  return 0;
971 }
972 
973 /**
974  * Decode the first and second partition.
975  * @return <0 if error (and sets error type in the error_status_table)
976  */
978 {
979  MpegEncContext *s = &ctx->m;
980  int mb_num;
981  int ret;
982  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
983  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
984 
985  mb_num = mpeg4_decode_partition_a(ctx);
986  if (mb_num <= 0) {
987  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
988  s->mb_x, s->mb_y, part_a_error);
989  return mb_num ? mb_num : AVERROR_INVALIDDATA;
990  }
991 
992  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
993  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
994  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
995  s->mb_x, s->mb_y, part_a_error);
996  return AVERROR_INVALIDDATA;
997  }
998 
999  s->mb_num_left = mb_num;
1000 
1001  if (s->pict_type == AV_PICTURE_TYPE_I) {
1002  while (show_bits(&s->gb, 9) == 1)
1003  skip_bits(&s->gb, 9);
1004  if (get_bits(&s->gb, 19) != DC_MARKER) {
1005  av_log(s->avctx, AV_LOG_ERROR,
1006  "marker missing after first I partition at %d %d\n",
1007  s->mb_x, s->mb_y);
1008  return AVERROR_INVALIDDATA;
1009  }
1010  } else {
1011  while (show_bits(&s->gb, 10) == 1)
1012  skip_bits(&s->gb, 10);
1013  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
1014  av_log(s->avctx, AV_LOG_ERROR,
1015  "marker missing after first P partition at %d %d\n",
1016  s->mb_x, s->mb_y);
1017  return AVERROR_INVALIDDATA;
1018  }
1019  }
1020  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1021  s->mb_x - 1, s->mb_y, part_a_end);
1022 
1023  ret = mpeg4_decode_partition_b(s, mb_num);
1024  if (ret < 0) {
1025  if (s->pict_type == AV_PICTURE_TYPE_P)
1026  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1027  s->mb_x, s->mb_y, ER_DC_ERROR);
1028  return ret;
1029  } else {
1030  if (s->pict_type == AV_PICTURE_TYPE_P)
1031  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1032  s->mb_x - 1, s->mb_y, ER_DC_END);
1033  }
1034 
1035  return 0;
1036 }
1037 
1038 /**
1039  * Decode a block.
1040  * @return <0 if an error occurred
1041  */
1042 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
1043  int n, int coded, int intra, int rvlc)
1044 {
1045  MpegEncContext *s = &ctx->m;
1046  int level, i, last, run, qmul, qadd;
1047  int av_uninit(dc_pred_dir);
1048  RLTable *rl;
1050  const uint8_t *scan_table;
1051 
1052  // Note intra & rvlc should be optimized away if this is inlined
1053 
1054  if (intra) {
1055  if (ctx->use_intra_dc_vlc) {
1056  /* DC coef */
1057  if (s->partitioned_frame) {
1058  level = s->dc_val[0][s->block_index[n]];
1059  if (n < 4)
1060  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1061  else
1062  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1063  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1064  } else {
1065  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1066  if (level < 0)
1067  return level;
1068  }
1069  block[0] = level;
1070  i = 0;
1071  } else {
1072  i = -1;
1073  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1074  }
1075  if (!coded)
1076  goto not_coded;
1077 
1078  if (rvlc) {
1079  rl = &ff_rvlc_rl_intra;
1081  } else {
1082  rl = &ff_mpeg4_rl_intra;
1084  }
1085  if (s->ac_pred) {
1086  if (dc_pred_dir == 0)
1087  scan_table = s->intra_v_scantable.permutated; /* left */
1088  else
1089  scan_table = s->intra_h_scantable.permutated; /* top */
1090  } else {
1091  scan_table = s->intra_scantable.permutated;
1092  }
1093  qmul = 1;
1094  qadd = 0;
1095  } else {
1096  i = -1;
1097  if (!coded) {
1098  s->block_last_index[n] = i;
1099  return 0;
1100  }
1101  if (rvlc)
1102  rl = &ff_rvlc_rl_inter;
1103  else
1104  rl = &ff_h263_rl_inter;
1105 
1106  scan_table = s->intra_scantable.permutated;
1107 
1108  if (s->mpeg_quant) {
1109  qmul = 1;
1110  qadd = 0;
1111  if (rvlc)
1113  else
1115  } else {
1116  qmul = s->qscale << 1;
1117  qadd = (s->qscale - 1) | 1;
1118  if (rvlc)
1119  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1120  else
1121  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1122  }
1123  }
1124  {
1125  OPEN_READER(re, &s->gb);
1126  for (;;) {
1127  UPDATE_CACHE(re, &s->gb);
1128  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1129  if (level == 0) {
1130  /* escape */
1131  if (rvlc) {
1132  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1133  av_log(s->avctx, AV_LOG_ERROR,
1134  "1. marker bit missing in rvlc esc\n");
1135  return AVERROR_INVALIDDATA;
1136  }
1137  SKIP_CACHE(re, &s->gb, 1);
1138 
1139  last = SHOW_UBITS(re, &s->gb, 1);
1140  SKIP_CACHE(re, &s->gb, 1);
1141  run = SHOW_UBITS(re, &s->gb, 6);
1142  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1143  UPDATE_CACHE(re, &s->gb);
1144 
1145  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1146  av_log(s->avctx, AV_LOG_ERROR,
1147  "2. marker bit missing in rvlc esc\n");
1148  return AVERROR_INVALIDDATA;
1149  }
1150  SKIP_CACHE(re, &s->gb, 1);
1151 
1152  level = SHOW_UBITS(re, &s->gb, 11);
1153  SKIP_CACHE(re, &s->gb, 11);
1154 
1155  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1156  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1157  return AVERROR_INVALIDDATA;
1158  }
1159  SKIP_CACHE(re, &s->gb, 5);
1160 
1161  level = level * qmul + qadd;
1162  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1163  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1164 
1165  i += run + 1;
1166  if (last)
1167  i += 192;
1168  } else {
1169  int cache;
1170  cache = GET_CACHE(re, &s->gb);
1171 
1172  if (IS_3IV1)
1173  cache ^= 0xC0000000;
1174 
1175  if (cache & 0x80000000) {
1176  if (cache & 0x40000000) {
1177  /* third escape */
1178  SKIP_CACHE(re, &s->gb, 2);
1179  last = SHOW_UBITS(re, &s->gb, 1);
1180  SKIP_CACHE(re, &s->gb, 1);
1181  run = SHOW_UBITS(re, &s->gb, 6);
1182  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1183  UPDATE_CACHE(re, &s->gb);
1184 
1185  if (IS_3IV1) {
1186  level = SHOW_SBITS(re, &s->gb, 12);
1187  LAST_SKIP_BITS(re, &s->gb, 12);
1188  } else {
1189  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1190  av_log(s->avctx, AV_LOG_ERROR,
1191  "1. marker bit missing in 3. esc\n");
1192  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR) || get_bits_left(&s->gb) <= 0)
1193  return AVERROR_INVALIDDATA;
1194  }
1195  SKIP_CACHE(re, &s->gb, 1);
1196 
1197  level = SHOW_SBITS(re, &s->gb, 12);
1198  SKIP_CACHE(re, &s->gb, 12);
1199 
1200  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1201  av_log(s->avctx, AV_LOG_ERROR,
1202  "2. marker bit missing in 3. esc\n");
1203  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR) || get_bits_left(&s->gb) <= 0)
1204  return AVERROR_INVALIDDATA;
1205  }
1206 
1207  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1208  }
1209 
1210 #if 0
1211  if (s->error_recognition >= FF_ER_COMPLIANT) {
1212  const int abs_level= FFABS(level);
1213  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1214  const int run1= run - rl->max_run[last][abs_level] - 1;
1215  if (abs_level <= rl->max_level[last][run]) {
1216  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1217  return AVERROR_INVALIDDATA;
1218  }
1219  if (s->error_recognition > FF_ER_COMPLIANT) {
1220  if (abs_level <= rl->max_level[last][run]*2) {
1221  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1222  return AVERROR_INVALIDDATA;
1223  }
1224  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1225  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1226  return AVERROR_INVALIDDATA;
1227  }
1228  }
1229  }
1230  }
1231 #endif
1232  if (level > 0)
1233  level = level * qmul + qadd;
1234  else
1235  level = level * qmul - qadd;
1236 
1237  if ((unsigned)(level + 2048) > 4095) {
1238  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1239  if (level > 2560 || level < -2560) {
1240  av_log(s->avctx, AV_LOG_ERROR,
1241  "|level| overflow in 3. esc, qp=%d\n",
1242  s->qscale);
1243  return AVERROR_INVALIDDATA;
1244  }
1245  }
1246  level = level < 0 ? -2048 : 2047;
1247  }
1248 
1249  i += run + 1;
1250  if (last)
1251  i += 192;
1252  } else {
1253  /* second escape */
1254  SKIP_BITS(re, &s->gb, 2);
1255  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1256  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1257  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1258  LAST_SKIP_BITS(re, &s->gb, 1);
1259  }
1260  } else {
1261  /* first escape */
1262  SKIP_BITS(re, &s->gb, 1);
1263  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1264  i += run;
1265  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1266  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1267  LAST_SKIP_BITS(re, &s->gb, 1);
1268  }
1269  }
1270  } else {
1271  i += run;
1272  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1273  LAST_SKIP_BITS(re, &s->gb, 1);
1274  }
1275  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1276  if (i > 62) {
1277  i -= 192;
1278  if (i & (~63)) {
1279  av_log(s->avctx, AV_LOG_ERROR,
1280  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1281  return AVERROR_INVALIDDATA;
1282  }
1283 
1284  block[scan_table[i]] = level;
1285  break;
1286  }
1287 
1288  block[scan_table[i]] = level;
1289  }
1290  CLOSE_READER(re, &s->gb);
1291  }
1292 
1293 not_coded:
1294  if (intra) {
1295  if (!ctx->use_intra_dc_vlc) {
1296  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1297 
1298  i -= i >> 31; // if (i == -1) i = 0;
1299  }
1300 
1301  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1302  if (s->ac_pred)
1303  i = 63; // FIXME not optimal
1304  }
1305  s->block_last_index[n] = i;
1306  return 0;
1307 }
1308 
1309 /**
1310  * decode partition C of one MB.
1311  * @return <0 if an error occurred
1312  */
1314 {
1315  Mpeg4DecContext *ctx = s->avctx->priv_data;
1316  int cbp, mb_type;
1317  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1318 
1319  av_assert2(s == (void*)ctx);
1320 
1321  mb_type = s->current_picture.mb_type[xy];
1322  cbp = s->cbp_table[xy];
1323 
1324  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1325 
1326  if (s->current_picture.qscale_table[xy] != s->qscale)
1327  ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1328 
1329  if (s->pict_type == AV_PICTURE_TYPE_P ||
1330  s->pict_type == AV_PICTURE_TYPE_S) {
1331  int i;
1332  for (i = 0; i < 4; i++) {
1333  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1334  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1335  }
1336  s->mb_intra = IS_INTRA(mb_type);
1337 
1338  if (IS_SKIP(mb_type)) {
1339  /* skip mb */
1340  for (i = 0; i < 6; i++)
1341  s->block_last_index[i] = -1;
1342  s->mv_dir = MV_DIR_FORWARD;
1343  s->mv_type = MV_TYPE_16X16;
1344  if (s->pict_type == AV_PICTURE_TYPE_S
1345  && ctx->vol_sprite_usage == GMC_SPRITE) {
1346  s->mcsel = 1;
1347  s->mb_skipped = 0;
1348  } else {
1349  s->mcsel = 0;
1350  s->mb_skipped = 1;
1351  }
1352  } else if (s->mb_intra) {
1353  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1354  } else if (!s->mb_intra) {
1355  // s->mcsel = 0; // FIXME do we need to init that?
1356 
1357  s->mv_dir = MV_DIR_FORWARD;
1358  if (IS_8X8(mb_type)) {
1359  s->mv_type = MV_TYPE_8X8;
1360  } else {
1361  s->mv_type = MV_TYPE_16X16;
1362  }
1363  }
1364  } else { /* I-Frame */
1365  s->mb_intra = 1;
1366  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1367  }
1368 
1369  if (!IS_SKIP(mb_type)) {
1370  int i;
1371  s->bdsp.clear_blocks(s->block[0]);
1372  /* decode each block */
1373  for (i = 0; i < 6; i++) {
1374  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1375  av_log(s->avctx, AV_LOG_ERROR,
1376  "texture corrupted at %d %d %d\n",
1377  s->mb_x, s->mb_y, s->mb_intra);
1378  return AVERROR_INVALIDDATA;
1379  }
1380  cbp += cbp;
1381  }
1382  }
1383 
1384  /* per-MB end of slice check */
1385  if (--s->mb_num_left <= 0) {
1386  if (mpeg4_is_resync(ctx))
1387  return SLICE_END;
1388  else
1389  return SLICE_NOEND;
1390  } else {
1391  if (mpeg4_is_resync(ctx)) {
1392  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1393  if (s->cbp_table[xy + delta])
1394  return SLICE_END;
1395  }
1396  return SLICE_OK;
1397  }
1398 }
1399 
1400 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1401 {
1402  Mpeg4DecContext *ctx = s->avctx->priv_data;
1403  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1404  int16_t *mot_val;
1405  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1406  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1407 
1408  av_assert2(s == (void*)ctx);
1409  av_assert2(s->h263_pred);
1410 
1411  if (s->pict_type == AV_PICTURE_TYPE_P ||
1412  s->pict_type == AV_PICTURE_TYPE_S) {
1413  do {
1414  if (get_bits1(&s->gb)) {
1415  /* skip mb */
1416  s->mb_intra = 0;
1417  for (i = 0; i < 6; i++)
1418  s->block_last_index[i] = -1;
1419  s->mv_dir = MV_DIR_FORWARD;
1420  s->mv_type = MV_TYPE_16X16;
1421  if (s->pict_type == AV_PICTURE_TYPE_S &&
1422  ctx->vol_sprite_usage == GMC_SPRITE) {
1423  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1424  MB_TYPE_GMC |
1425  MB_TYPE_16x16 |
1426  MB_TYPE_L0;
1427  s->mcsel = 1;
1428  s->mv[0][0][0] = get_amv(ctx, 0);
1429  s->mv[0][0][1] = get_amv(ctx, 1);
1430  s->mb_skipped = 0;
1431  } else {
1432  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1433  MB_TYPE_16x16 |
1434  MB_TYPE_L0;
1435  s->mcsel = 0;
1436  s->mv[0][0][0] = 0;
1437  s->mv[0][0][1] = 0;
1438  s->mb_skipped = 1;
1439  }
1440  goto end;
1441  }
1443  if (cbpc < 0) {
1444  av_log(s->avctx, AV_LOG_ERROR,
1445  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1446  return AVERROR_INVALIDDATA;
1447  }
1448  } while (cbpc == 20);
1449 
1450  s->bdsp.clear_blocks(s->block[0]);
1451  dquant = cbpc & 8;
1452  s->mb_intra = ((cbpc & 4) != 0);
1453  if (s->mb_intra)
1454  goto intra;
1455 
1456  if (s->pict_type == AV_PICTURE_TYPE_S &&
1457  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1458  s->mcsel = get_bits1(&s->gb);
1459  else
1460  s->mcsel = 0;
1461  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1462  if (cbpy < 0) {
1463  av_log(s->avctx, AV_LOG_ERROR,
1464  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1465  return AVERROR_INVALIDDATA;
1466  }
1467 
1468  cbp = (cbpc & 3) | (cbpy << 2);
1469  if (dquant)
1470  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1471  if ((!s->progressive_sequence) &&
1472  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1473  s->interlaced_dct = get_bits1(&s->gb);
1474 
1475  s->mv_dir = MV_DIR_FORWARD;
1476  if ((cbpc & 16) == 0) {
1477  if (s->mcsel) {
1478  s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1479  MB_TYPE_16x16 |
1480  MB_TYPE_L0;
1481  /* 16x16 global motion prediction */
1482  s->mv_type = MV_TYPE_16X16;
1483  mx = get_amv(ctx, 0);
1484  my = get_amv(ctx, 1);
1485  s->mv[0][0][0] = mx;
1486  s->mv[0][0][1] = my;
1487  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1488  s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1489  MB_TYPE_L0 |
1491  /* 16x8 field motion prediction */
1492  s->mv_type = MV_TYPE_FIELD;
1493 
1494  s->field_select[0][0] = get_bits1(&s->gb);
1495  s->field_select[0][1] = get_bits1(&s->gb);
1496 
1497  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1498 
1499  for (i = 0; i < 2; i++) {
1500  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1501  if (mx >= 0xffff)
1502  return AVERROR_INVALIDDATA;
1503 
1504  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1505  if (my >= 0xffff)
1506  return AVERROR_INVALIDDATA;
1507 
1508  s->mv[0][i][0] = mx;
1509  s->mv[0][i][1] = my;
1510  }
1511  } else {
1512  s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1513  /* 16x16 motion prediction */
1514  s->mv_type = MV_TYPE_16X16;
1515  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1516  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1517 
1518  if (mx >= 0xffff)
1519  return AVERROR_INVALIDDATA;
1520 
1521  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1522 
1523  if (my >= 0xffff)
1524  return AVERROR_INVALIDDATA;
1525  s->mv[0][0][0] = mx;
1526  s->mv[0][0][1] = my;
1527  }
1528  } else {
1529  s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1530  s->mv_type = MV_TYPE_8X8;
1531  for (i = 0; i < 4; i++) {
1532  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1533  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1534  if (mx >= 0xffff)
1535  return AVERROR_INVALIDDATA;
1536 
1537  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1538  if (my >= 0xffff)
1539  return AVERROR_INVALIDDATA;
1540  s->mv[0][i][0] = mx;
1541  s->mv[0][i][1] = my;
1542  mot_val[0] = mx;
1543  mot_val[1] = my;
1544  }
1545  }
1546  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1547  int modb1; // first bit of modb
1548  int modb2; // second bit of modb
1549  int mb_type;
1550 
1551  s->mb_intra = 0; // B-frames never contain intra blocks
1552  s->mcsel = 0; // ... true gmc blocks
1553 
1554  if (s->mb_x == 0) {
1555  for (i = 0; i < 2; i++) {
1556  s->last_mv[i][0][0] =
1557  s->last_mv[i][0][1] =
1558  s->last_mv[i][1][0] =
1559  s->last_mv[i][1][1] = 0;
1560  }
1561 
1562  ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1563  }
1564 
1565  /* if we skipped it in the future P-frame than skip it now too */
1566  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1567 
1568  if (s->mb_skipped) {
1569  /* skip mb */
1570  for (i = 0; i < 6; i++)
1571  s->block_last_index[i] = -1;
1572 
1573  s->mv_dir = MV_DIR_FORWARD;
1574  s->mv_type = MV_TYPE_16X16;
1575  s->mv[0][0][0] =
1576  s->mv[0][0][1] =
1577  s->mv[1][0][0] =
1578  s->mv[1][0][1] = 0;
1579  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1580  MB_TYPE_16x16 |
1581  MB_TYPE_L0;
1582  goto end;
1583  }
1584 
1585  modb1 = get_bits1(&s->gb);
1586  if (modb1) {
1587  // like MB_TYPE_B_DIRECT but no vectors coded
1589  cbp = 0;
1590  } else {
1591  modb2 = get_bits1(&s->gb);
1592  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1593  if (mb_type < 0) {
1594  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1595  return AVERROR_INVALIDDATA;
1596  }
1597  mb_type = mb_type_b_map[mb_type];
1598  if (modb2) {
1599  cbp = 0;
1600  } else {
1601  s->bdsp.clear_blocks(s->block[0]);
1602  cbp = get_bits(&s->gb, 6);
1603  }
1604 
1605  if ((!IS_DIRECT(mb_type)) && cbp) {
1606  if (get_bits1(&s->gb))
1607  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1608  }
1609 
1610  if (!s->progressive_sequence) {
1611  if (cbp)
1612  s->interlaced_dct = get_bits1(&s->gb);
1613 
1614  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1615  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1616  mb_type &= ~MB_TYPE_16x16;
1617 
1618  if (USES_LIST(mb_type, 0)) {
1619  s->field_select[0][0] = get_bits1(&s->gb);
1620  s->field_select[0][1] = get_bits1(&s->gb);
1621  }
1622  if (USES_LIST(mb_type, 1)) {
1623  s->field_select[1][0] = get_bits1(&s->gb);
1624  s->field_select[1][1] = get_bits1(&s->gb);
1625  }
1626  }
1627  }
1628 
1629  s->mv_dir = 0;
1630  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1631  s->mv_type = MV_TYPE_16X16;
1632 
1633  if (USES_LIST(mb_type, 0)) {
1634  s->mv_dir = MV_DIR_FORWARD;
1635 
1636  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1637  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1638  s->last_mv[0][1][0] =
1639  s->last_mv[0][0][0] =
1640  s->mv[0][0][0] = mx;
1641  s->last_mv[0][1][1] =
1642  s->last_mv[0][0][1] =
1643  s->mv[0][0][1] = my;
1644  }
1645 
1646  if (USES_LIST(mb_type, 1)) {
1647  s->mv_dir |= MV_DIR_BACKWARD;
1648 
1649  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1650  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1651  s->last_mv[1][1][0] =
1652  s->last_mv[1][0][0] =
1653  s->mv[1][0][0] = mx;
1654  s->last_mv[1][1][1] =
1655  s->last_mv[1][0][1] =
1656  s->mv[1][0][1] = my;
1657  }
1658  } else if (!IS_DIRECT(mb_type)) {
1659  s->mv_type = MV_TYPE_FIELD;
1660 
1661  if (USES_LIST(mb_type, 0)) {
1662  s->mv_dir = MV_DIR_FORWARD;
1663 
1664  for (i = 0; i < 2; i++) {
1665  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1666  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1667  s->last_mv[0][i][0] =
1668  s->mv[0][i][0] = mx;
1669  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1670  }
1671  }
1672 
1673  if (USES_LIST(mb_type, 1)) {
1674  s->mv_dir |= MV_DIR_BACKWARD;
1675 
1676  for (i = 0; i < 2; i++) {
1677  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1678  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1679  s->last_mv[1][i][0] =
1680  s->mv[1][i][0] = mx;
1681  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1682  }
1683  }
1684  }
1685  }
1686 
1687  if (IS_DIRECT(mb_type)) {
1688  if (IS_SKIP(mb_type)) {
1689  mx =
1690  my = 0;
1691  } else {
1692  mx = ff_h263_decode_motion(s, 0, 1);
1693  my = ff_h263_decode_motion(s, 0, 1);
1694  }
1695 
1696  s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1697  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1698  }
1699  s->current_picture.mb_type[xy] = mb_type;
1700  } else { /* I-Frame */
1701  do {
1703  if (cbpc < 0) {
1704  av_log(s->avctx, AV_LOG_ERROR,
1705  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1706  return AVERROR_INVALIDDATA;
1707  }
1708  } while (cbpc == 8);
1709 
1710  dquant = cbpc & 4;
1711  s->mb_intra = 1;
1712 
1713 intra:
1714  s->ac_pred = get_bits1(&s->gb);
1715  if (s->ac_pred)
1716  s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1717  else
1718  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1719 
1720  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1721  if (cbpy < 0) {
1722  av_log(s->avctx, AV_LOG_ERROR,
1723  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1724  return AVERROR_INVALIDDATA;
1725  }
1726  cbp = (cbpc & 3) | (cbpy << 2);
1727 
1728  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1729 
1730  if (dquant)
1731  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1732 
1733  if (!s->progressive_sequence)
1734  s->interlaced_dct = get_bits1(&s->gb);
1735 
1736  s->bdsp.clear_blocks(s->block[0]);
1737  /* decode each block */
1738  for (i = 0; i < 6; i++) {
1739  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1740  return AVERROR_INVALIDDATA;
1741  cbp += cbp;
1742  }
1743  goto end;
1744  }
1745 
1746  /* decode each block */
1747  for (i = 0; i < 6; i++) {
1748  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1749  return AVERROR_INVALIDDATA;
1750  cbp += cbp;
1751  }
1752 
1753 end:
1754  /* per-MB end of slice check */
1755  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1756  int next = mpeg4_is_resync(ctx);
1757  if (next) {
1758  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1759  return AVERROR_INVALIDDATA;
1760  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1761  return SLICE_END;
1762 
1763  if (s->pict_type == AV_PICTURE_TYPE_B) {
1764  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1765  ff_thread_await_progress(&s->next_picture_ptr->tf,
1766  (s->mb_x + delta >= s->mb_width)
1767  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1768  : s->mb_y, 0);
1769  if (s->next_picture.mbskip_table[xy + delta])
1770  return SLICE_OK;
1771  }
1772 
1773  return SLICE_END;
1774  }
1775  }
1776 
1777  return SLICE_OK;
1778 }
1779 
1780 /* As per spec, studio start code search isn't the same as the old type of start code */
1782 {
1783  align_get_bits(gb);
1784 
1785  while (get_bits_left(gb) >= 24 && show_bits(gb, 24) != 0x1) {
1786  get_bits(gb, 8);
1787  }
1788 }
1789 
1790 /* additional_code, vlc index */
1791 static const uint8_t ac_state_tab[22][2] =
1792 {
1793  {0, 0},
1794  {0, 1},
1795  {1, 1},
1796  {2, 1},
1797  {3, 1},
1798  {4, 1},
1799  {5, 1},
1800  {1, 2},
1801  {2, 2},
1802  {3, 2},
1803  {4, 2},
1804  {5, 2},
1805  {6, 2},
1806  {1, 3},
1807  {2, 4},
1808  {3, 5},
1809  {4, 6},
1810  {5, 7},
1811  {6, 8},
1812  {7, 9},
1813  {8, 10},
1814  {0, 11}
1815 };
1816 
1818 {
1819  Mpeg4DecContext *ctx = s->avctx->priv_data;
1820 
1821  int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
1822  additional_code_len, sign, mismatch;
1823  const VLC *cur_vlc = &studio_intra_tab[0];
1824  uint8_t *const scantable = s->intra_scantable.permutated;
1825  const uint16_t *quant_matrix;
1826  uint32_t flc;
1827  const int min = -1 * (1 << (s->avctx->bits_per_raw_sample + 6));
1828  const int max = ((1 << (s->avctx->bits_per_raw_sample + 6)) - 1);
1829  int shift = 3 - s->dct_precision;
1830 
1831  mismatch = 1;
1832 
1833  memset(block, 0, 64 * sizeof(int32_t));
1834 
1835  if (n < 4) {
1836  cc = 0;
1837  dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1838  quant_matrix = s->intra_matrix;
1839  } else {
1840  cc = (n & 1) + 1;
1841  if (ctx->rgb)
1842  dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1843  else
1844  dct_dc_size = get_vlc2(&s->gb, studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
1845  quant_matrix = s->chroma_intra_matrix;
1846  }
1847 
1848  if (dct_dc_size == 0) {
1849  dct_diff = 0;
1850  } else {
1851  dct_diff = get_xbits(&s->gb, dct_dc_size);
1852 
1853  if (dct_dc_size > 8) {
1854  if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
1855  return AVERROR_INVALIDDATA;
1856  }
1857 
1858  }
1859 
1860  s->last_dc[cc] += dct_diff;
1861 
1862  if (s->mpeg_quant)
1863  block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
1864  else
1865  block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
1866  /* TODO: support mpeg_quant for AC coefficients */
1867 
1868  block[0] = av_clip(block[0], min, max);
1869  mismatch ^= block[0];
1870 
1871  /* AC Coefficients */
1872  while (1) {
1873  group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);
1874 
1875  if (group < 0) {
1876  av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
1877  return AVERROR_INVALIDDATA;
1878  }
1879 
1880  additional_code_len = ac_state_tab[group][0];
1881  cur_vlc = &studio_intra_tab[ac_state_tab[group][1]];
1882 
1883  if (group == 0) {
1884  /* End of Block */
1885  break;
1886  } else if (group >= 1 && group <= 6) {
1887  /* Zero run length (Table B.47) */
1888  run = 1 << additional_code_len;
1889  if (additional_code_len)
1890  run += get_bits(&s->gb, additional_code_len);
1891  idx += run;
1892  continue;
1893  } else if (group >= 7 && group <= 12) {
1894  /* Zero run length and +/-1 level (Table B.48) */
1895  code = get_bits(&s->gb, additional_code_len);
1896  sign = code & 1;
1897  code >>= 1;
1898  run = (1 << (additional_code_len - 1)) + code;
1899  idx += run;
1900  if (idx > 63)
1901  return AVERROR_INVALIDDATA;
1902  j = scantable[idx++];
1903  block[j] = sign ? 1 : -1;
1904  } else if (group >= 13 && group <= 20) {
1905  /* Level value (Table B.49) */
1906  if (idx > 63)
1907  return AVERROR_INVALIDDATA;
1908  j = scantable[idx++];
1909  block[j] = get_xbits(&s->gb, additional_code_len);
1910  } else if (group == 21) {
1911  /* Escape */
1912  if (idx > 63)
1913  return AVERROR_INVALIDDATA;
1914  j = scantable[idx++];
1915  additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
1916  flc = get_bits(&s->gb, additional_code_len);
1917  if (flc >> (additional_code_len-1))
1918  block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
1919  else
1920  block[j] = flc;
1921  }
1922  block[j] = ((block[j] * quant_matrix[j] * s->qscale) * (1 << shift)) / 16;
1923  block[j] = av_clip(block[j], min, max);
1924  mismatch ^= block[j];
1925  }
1926 
1927  block[63] ^= mismatch & 1;
1928 
1929  return 0;
1930 }
1931 
1932 static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
1933 {
1934  int i, j, w, h, idx = 0;
1935  int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
1936  dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
1937  h = 16 >> (n ? s->chroma_y_shift : 0);
1938  w = 16 >> (n ? s->chroma_x_shift : 0);
1939 
1940  block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1941  if (block_mean == 0){
1942  av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
1943  return AVERROR_INVALIDDATA;
1944  }
1945  s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));
1946 
1947  rice_parameter = get_bits(&s->gb, 4);
1948  if (rice_parameter == 0) {
1949  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1950  return AVERROR_INVALIDDATA;
1951  }
1952 
1953  if (rice_parameter == 15)
1954  rice_parameter = 0;
1955 
1956  if (rice_parameter > 11) {
1957  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1958  return AVERROR_INVALIDDATA;
1959  }
1960 
1961  for (i = 0; i < h; i++) {
1962  output = 1 << (s->avctx->bits_per_raw_sample - 1);
1963  top = 1 << (s->avctx->bits_per_raw_sample - 1);
1964 
1965  for (j = 0; j < w; j++) {
1966  left = output;
1967  topleft = top;
1968 
1969  rice_prefix_code = get_unary(&s->gb, 1, 12);
1970 
1971  /* Escape */
1972  if (rice_prefix_code == 11)
1973  dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1974  else {
1975  if (rice_prefix_code == 12) {
1976  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
1977  return AVERROR_INVALIDDATA;
1978  }
1979  rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
1980  dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
1981  }
1982 
1983  /* Map to a signed residual */
1984  if (dpcm_residual & 1)
1985  dpcm_residual = (-1 * dpcm_residual) >> 1;
1986  else
1987  dpcm_residual = (dpcm_residual >> 1);
1988 
1989  if (i != 0)
1990  top = macroblock[idx-w];
1991 
1992  p = left + top - topleft;
1993  min_left_top = FFMIN(left, top);
1994  if (p < min_left_top)
1995  p = min_left_top;
1996 
1997  max_left_top = FFMAX(left, top);
1998  if (p > max_left_top)
1999  p = max_left_top;
2000 
2001  p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
2002  if (p2 == p)
2003  p2 = block_mean;
2004 
2005  if (p2 > p)
2006  dpcm_residual *= -1;
2007 
2008  macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
2009  }
2010  }
2011 
2012  return 0;
2013 }
2014 
2015 static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
2016 {
2017  int i;
2018 
2019  s->dpcm_direction = 0;
2020 
2021  /* StudioMacroblock */
2022  /* Assumes I-VOP */
2023  s->mb_intra = 1;
2024  if (get_bits1(&s->gb)) { /* compression_mode */
2025  /* DCT */
2026  /* macroblock_type, 1 or 2-bit VLC */
2027  if (!get_bits1(&s->gb)) {
2028  skip_bits1(&s->gb);
2029  s->qscale = mpeg_get_qscale(s);
2030  }
2031 
2032  for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
2033  if (mpeg4_decode_studio_block(s, (*s->block32)[i], i) < 0)
2034  return AVERROR_INVALIDDATA;
2035  }
2036  } else {
2037  /* DPCM */
2038  check_marker(s->avctx, &s->gb, "DPCM block start");
2039  s->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
2040  for (i = 0; i < 3; i++) {
2041  if (mpeg4_decode_dpcm_macroblock(s, (*s->dpcm_macroblock)[i], i) < 0)
2042  return AVERROR_INVALIDDATA;
2043  }
2044  }
2045 
2046  if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
2047  next_start_code_studio(&s->gb);
2048  return SLICE_END;
2049  }
2050 
2051  //vcon-stp9L1.bits (first frame)
2052  if (get_bits_left(&s->gb) == 0)
2053  return SLICE_END;
2054 
2055  //vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
2056  if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
2057  return SLICE_END;
2058 
2059  return SLICE_OK;
2060 }
2061 
2063 {
2064  int hours, minutes, seconds;
2065 
2066  if (!show_bits(gb, 23)) {
2067  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
2068  return AVERROR_INVALIDDATA;
2069  }
2070 
2071  hours = get_bits(gb, 5);
2072  minutes = get_bits(gb, 6);
2073  check_marker(s->avctx, gb, "in gop_header");
2074  seconds = get_bits(gb, 6);
2075 
2076  s->time_base = seconds + 60*(minutes + 60*hours);
2077 
2078  skip_bits1(gb);
2079  skip_bits1(gb);
2080 
2081  return 0;
2082 }
2083 
2085 {
2086 
2087  *profile = get_bits(gb, 4);
2088  *level = get_bits(gb, 4);
2089 
2090  // for Simple profile, level 0
2091  if (*profile == 0 && *level == 8) {
2092  *level = 0;
2093  }
2094 
2095  return 0;
2096 }
2097 
2099 {
2100  int visual_object_type;
2101  int is_visual_object_identifier = get_bits1(gb);
2102 
2103  if (is_visual_object_identifier) {
2104  skip_bits(gb, 4+3);
2105  }
2106  visual_object_type = get_bits(gb, 4);
2107 
2108  if (visual_object_type == VOT_VIDEO_ID ||
2109  visual_object_type == VOT_STILL_TEXTURE_ID) {
2110  int video_signal_type = get_bits1(gb);
2111  if (video_signal_type) {
2112  int video_range, color_description;
2113  skip_bits(gb, 3); // video_format
2114  video_range = get_bits1(gb);
2115  color_description = get_bits1(gb);
2116 
2117  s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
2118 
2119  if (color_description) {
2120  s->avctx->color_primaries = get_bits(gb, 8);
2121  s->avctx->color_trc = get_bits(gb, 8);
2122  s->avctx->colorspace = get_bits(gb, 8);
2123  }
2124  }
2125  }
2126 
2127  return 0;
2128 }
2129 
2131 {
2132  int i, v;
2133 
2134  /* load default matrices */
2135  for (i = 0; i < 64; i++) {
2136  int j = s->idsp.idct_permutation[i];
2138  s->intra_matrix[j] = v;
2139  s->chroma_intra_matrix[j] = v;
2140 
2142  s->inter_matrix[j] = v;
2143  s->chroma_inter_matrix[j] = v;
2144  }
2145 }
2146 
2148 {
2149  int i, j, v;
2150 
2151  if (get_bits1(gb)) {
2152  if (get_bits_left(gb) < 64*8)
2153  return AVERROR_INVALIDDATA;
2154  /* intra_quantiser_matrix */
2155  for (i = 0; i < 64; i++) {
2156  v = get_bits(gb, 8);
2157  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2158  s->intra_matrix[j] = v;
2159  s->chroma_intra_matrix[j] = v;
2160  }
2161  }
2162 
2163  if (get_bits1(gb)) {
2164  if (get_bits_left(gb) < 64*8)
2165  return AVERROR_INVALIDDATA;
2166  /* non_intra_quantiser_matrix */
2167  for (i = 0; i < 64; i++) {
2168  get_bits(gb, 8);
2169  }
2170  }
2171 
2172  if (get_bits1(gb)) {
2173  if (get_bits_left(gb) < 64*8)
2174  return AVERROR_INVALIDDATA;
2175  /* chroma_intra_quantiser_matrix */
2176  for (i = 0; i < 64; i++) {
2177  v = get_bits(gb, 8);
2178  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2179  s->chroma_intra_matrix[j] = v;
2180  }
2181  }
2182 
2183  if (get_bits1(gb)) {
2184  if (get_bits_left(gb) < 64*8)
2185  return AVERROR_INVALIDDATA;
2186  /* chroma_non_intra_quantiser_matrix */
2187  for (i = 0; i < 64; i++) {
2188  get_bits(gb, 8);
2189  }
2190  }
2191 
2193  return 0;
2194 }
2195 
2197 {
2198  uint32_t startcode;
2199  uint8_t extension_type;
2200 
2201  startcode = show_bits_long(gb, 32);
2202  if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {
2203 
2204  if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
2205  skip_bits_long(gb, 32);
2206  extension_type = get_bits(gb, 4);
2207  if (extension_type == QUANT_MATRIX_EXT_ID)
2208  read_quant_matrix_ext(s, gb);
2209  }
2210  }
2211 }
2212 
2214 {
2215  MpegEncContext *s = &ctx->m;
2216  int width, height;
2217  int bits_per_raw_sample;
2218  int rgb, chroma_format;
2219 
2220  // random_accessible_vol and video_object_type_indication have already
2221  // been read by the caller decode_vol_header()
2222  skip_bits(gb, 4); /* video_object_layer_verid */
2223  ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
2224  skip_bits(gb, 4); /* video_object_layer_shape_extension */
2225  skip_bits1(gb); /* progressive_sequence */
2226  if (ctx->shape != RECT_SHAPE) {
2227  avpriv_request_sample(s->avctx, "MPEG-4 Studio profile non rectangular shape");
2228  return AVERROR_PATCHWELCOME;
2229  }
2230  if (ctx->shape != BIN_ONLY_SHAPE) {
2231  rgb = get_bits1(gb); /* rgb_components */
2232  chroma_format = get_bits(gb, 2); /* chroma_format */
2233  if (!chroma_format || chroma_format == CHROMA_420 || (rgb && chroma_format == CHROMA_422)) {
2234  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2235  return AVERROR_INVALIDDATA;
2236  }
2237 
2238  bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
2239  if (bits_per_raw_sample == 10) {
2240  if (rgb) {
2241  s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
2242  } else {
2243  s->avctx->pix_fmt = chroma_format == CHROMA_422 ? AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV444P10;
2244  }
2245  } else {
2246  avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
2247  return AVERROR_PATCHWELCOME;
2248  }
2249  if (rgb != ctx->rgb || s->chroma_format != chroma_format)
2250  s->context_reinit = 1;
2251  s->avctx->bits_per_raw_sample = bits_per_raw_sample;
2252  ctx->rgb = rgb;
2253  s->chroma_format = chroma_format;
2254  }
2255  if (ctx->shape == RECT_SHAPE) {
2256  check_marker(s->avctx, gb, "before video_object_layer_width");
2257  width = get_bits(gb, 14); /* video_object_layer_width */
2258  check_marker(s->avctx, gb, "before video_object_layer_height");
2259  height = get_bits(gb, 14); /* video_object_layer_height */
2260  check_marker(s->avctx, gb, "after video_object_layer_height");
2261 
2262  /* Do the same check as non-studio profile */
2263  if (width && height) {
2264  if (s->width && s->height &&
2265  (s->width != width || s->height != height))
2266  s->context_reinit = 1;
2267  s->width = width;
2268  s->height = height;
2269  }
2270  }
2271  s->aspect_ratio_info = get_bits(gb, 4);
2272  if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
2273  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2274  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2275  } else {
2276  s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2277  }
2278  skip_bits(gb, 4); /* frame_rate_code */
2279  skip_bits(gb, 15); /* first_half_bit_rate */
2280  check_marker(s->avctx, gb, "after first_half_bit_rate");
2281  skip_bits(gb, 15); /* latter_half_bit_rate */
2282  check_marker(s->avctx, gb, "after latter_half_bit_rate");
2283  skip_bits(gb, 15); /* first_half_vbv_buffer_size */
2284  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2285  skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
2286  skip_bits(gb, 11); /* first_half_vbv_buffer_size */
2287  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2288  skip_bits(gb, 15); /* latter_half_vbv_occupancy */
2289  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2290  s->low_delay = get_bits1(gb);
2291  s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */
2292 
2294  extension_and_user_data(s, gb, 2);
2295 
2296  return 0;
2297 }
2298 
2300 {
2301  MpegEncContext *s = &ctx->m;
2302  int width, height, vo_ver_id;
2303 
2304  /* vol header */
2305  skip_bits(gb, 1); /* random access */
2306  s->vo_type = get_bits(gb, 8);
2307 
2308  /* If we are in studio profile (per vo_type), check if its all consistent
2309  * and if so continue pass control to decode_studio_vol_header().
2310  * elIf something is inconsistent, error out
2311  * else continue with (non studio) vol header decpoding.
2312  */
2313  if (s->vo_type == CORE_STUDIO_VO_TYPE ||
2314  s->vo_type == SIMPLE_STUDIO_VO_TYPE) {
2315  if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
2316  return AVERROR_INVALIDDATA;
2317  s->studio_profile = 1;
2318  s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
2319  return decode_studio_vol_header(ctx, gb);
2320  } else if (s->studio_profile) {
2321  return AVERROR_PATCHWELCOME;
2322  }
2323 
2324  if (get_bits1(gb) != 0) { /* is_ol_id */
2325  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
2326  skip_bits(gb, 3); /* vo_priority */
2327  } else {
2328  vo_ver_id = 1;
2329  }
2330  s->aspect_ratio_info = get_bits(gb, 4);
2331  if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
2332  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2333  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2334  } else {
2335  s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2336  }
2337 
2338  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
2339  int chroma_format = get_bits(gb, 2);
2340  if (chroma_format != CHROMA_420)
2341  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2342 
2343  s->low_delay = get_bits1(gb);
2344  if (get_bits1(gb)) { /* vbv parameters */
2345  get_bits(gb, 15); /* first_half_bitrate */
2346  check_marker(s->avctx, gb, "after first_half_bitrate");
2347  get_bits(gb, 15); /* latter_half_bitrate */
2348  check_marker(s->avctx, gb, "after latter_half_bitrate");
2349  get_bits(gb, 15); /* first_half_vbv_buffer_size */
2350  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2351  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
2352  get_bits(gb, 11); /* first_half_vbv_occupancy */
2353  check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
2354  get_bits(gb, 15); /* latter_half_vbv_occupancy */
2355  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2356  }
2357  } else {
2358  /* is setting low delay flag only once the smartest thing to do?
2359  * low delay detection will not be overridden. */
2360  if (s->picture_number == 0) {
2361  switch(s->vo_type) {
2362  case SIMPLE_VO_TYPE:
2363  case ADV_SIMPLE_VO_TYPE:
2364  s->low_delay = 1;
2365  break;
2366  default:
2367  s->low_delay = 0;
2368  }
2369  }
2370  }
2371 
2372  ctx->shape = get_bits(gb, 2); /* vol shape */
2373  if (ctx->shape != RECT_SHAPE)
2374  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
2375  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
2376  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
2377  skip_bits(gb, 4); /* video_object_layer_shape_extension */
2378  }
2379 
2380  check_marker(s->avctx, gb, "before time_increment_resolution");
2381 
2382  s->avctx->framerate.num = get_bits(gb, 16);
2383  if (!s->avctx->framerate.num) {
2384  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
2385  return AVERROR_INVALIDDATA;
2386  }
2387 
2388  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
2389  if (ctx->time_increment_bits < 1)
2390  ctx->time_increment_bits = 1;
2391 
2392  check_marker(s->avctx, gb, "before fixed_vop_rate");
2393 
2394  if (get_bits1(gb) != 0) /* fixed_vop_rate */
2395  s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
2396  else
2397  s->avctx->framerate.den = 1;
2398 
2399  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2400 
2401  ctx->t_frame = 0;
2402 
2403  if (ctx->shape != BIN_ONLY_SHAPE) {
2404  if (ctx->shape == RECT_SHAPE) {
2405  check_marker(s->avctx, gb, "before width");
2406  width = get_bits(gb, 13);
2407  check_marker(s->avctx, gb, "before height");
2408  height = get_bits(gb, 13);
2409  check_marker(s->avctx, gb, "after height");
2410  if (width && height && /* they should be non zero but who knows */
2411  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
2412  if (s->width && s->height &&
2413  (s->width != width || s->height != height))
2414  s->context_reinit = 1;
2415  s->width = width;
2416  s->height = height;
2417  }
2418  }
2419 
2420  s->progressive_sequence =
2421  s->progressive_frame = get_bits1(gb) ^ 1;
2422  s->interlaced_dct = 0;
2423  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
2424  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
2425  "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
2426  if (vo_ver_id == 1)
2427  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
2428  else
2429  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
2430 
2431  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2432  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
2433  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
2434  ctx->vol_sprite_usage == GMC_SPRITE) {
2435  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
2436  skip_bits(gb, 13); // sprite_width
2437  check_marker(s->avctx, gb, "after sprite_width");
2438  skip_bits(gb, 13); // sprite_height
2439  check_marker(s->avctx, gb, "after sprite_height");
2440  skip_bits(gb, 13); // sprite_left
2441  check_marker(s->avctx, gb, "after sprite_left");
2442  skip_bits(gb, 13); // sprite_top
2443  check_marker(s->avctx, gb, "after sprite_top");
2444  }
2445  ctx->num_sprite_warping_points = get_bits(gb, 6);
2446  if (ctx->num_sprite_warping_points > 3) {
2447  av_log(s->avctx, AV_LOG_ERROR,
2448  "%d sprite_warping_points\n",
2449  ctx->num_sprite_warping_points);
2450  ctx->num_sprite_warping_points = 0;
2451  return AVERROR_INVALIDDATA;
2452  }
2453  s->sprite_warping_accuracy = get_bits(gb, 2);
2454  ctx->sprite_brightness_change = get_bits1(gb);
2455  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2456  skip_bits1(gb); // low_latency_sprite
2457  }
2458  // FIXME sadct disable bit if verid!=1 && shape not rect
2459 
2460  if (get_bits1(gb) == 1) { /* not_8_bit */
2461  s->quant_precision = get_bits(gb, 4); /* quant_precision */
2462  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
2463  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
2464  if (s->quant_precision != 5)
2465  av_log(s->avctx, AV_LOG_ERROR,
2466  "quant precision %d\n", s->quant_precision);
2467  if (s->quant_precision<3 || s->quant_precision>9) {
2468  s->quant_precision = 5;
2469  }
2470  } else {
2471  s->quant_precision = 5;
2472  }
2473 
2474  // FIXME a bunch of grayscale shape things
2475 
2476  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
2477  int i, v;
2478 
2480 
2481  /* load custom intra matrix */
2482  if (get_bits1(gb)) {
2483  int last = 0;
2484  for (i = 0; i < 64; i++) {
2485  int j;
2486  if (get_bits_left(gb) < 8) {
2487  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2488  return AVERROR_INVALIDDATA;
2489  }
2490  v = get_bits(gb, 8);
2491  if (v == 0)
2492  break;
2493 
2494  last = v;
2495  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2496  s->intra_matrix[j] = last;
2497  s->chroma_intra_matrix[j] = last;
2498  }
2499 
2500  /* replicate last value */
2501  for (; i < 64; i++) {
2502  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2503  s->intra_matrix[j] = last;
2504  s->chroma_intra_matrix[j] = last;
2505  }
2506  }
2507 
2508  /* load custom non intra matrix */
2509  if (get_bits1(gb)) {
2510  int last = 0;
2511  for (i = 0; i < 64; i++) {
2512  int j;
2513  if (get_bits_left(gb) < 8) {
2514  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2515  return AVERROR_INVALIDDATA;
2516  }
2517  v = get_bits(gb, 8);
2518  if (v == 0)
2519  break;
2520 
2521  last = v;
2522  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2523  s->inter_matrix[j] = v;
2524  s->chroma_inter_matrix[j] = v;
2525  }
2526 
2527  /* replicate last value */
2528  for (; i < 64; i++) {
2529  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2530  s->inter_matrix[j] = last;
2531  s->chroma_inter_matrix[j] = last;
2532  }
2533  }
2534 
2535  // FIXME a bunch of grayscale shape things
2536  }
2537 
2538  if (vo_ver_id != 1)
2539  s->quarter_sample = get_bits1(gb);
2540  else
2541  s->quarter_sample = 0;
2542 
2543  if (get_bits_left(gb) < 4) {
2544  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
2545  return AVERROR_INVALIDDATA;
2546  }
2547 
2548  if (!get_bits1(gb)) {
2549  int pos = get_bits_count(gb);
2550  int estimation_method = get_bits(gb, 2);
2551  if (estimation_method < 2) {
2552  if (!get_bits1(gb)) {
2553  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2554  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2555  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2556  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2557  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2558  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2559  }
2560  if (!get_bits1(gb)) {
2561  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2562  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2563  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2564  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2565  }
2566  if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2567  skip_bits_long(gb, pos - get_bits_count(gb));
2568  goto no_cplx_est;
2569  }
2570  if (!get_bits1(gb)) {
2571  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2572  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2573  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2574  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2575  }
2576  if (!get_bits1(gb)) {
2577  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2578  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2579  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2580  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2581  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2582  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2583  }
2584  if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2585  skip_bits_long(gb, pos - get_bits_count(gb));
2586  goto no_cplx_est;
2587  }
2588  if (estimation_method == 1) {
2589  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2590  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2591  }
2592  } else
2593  av_log(s->avctx, AV_LOG_ERROR,
2594  "Invalid Complexity estimation method %d\n",
2595  estimation_method);
2596  } else {
2597 
2598 no_cplx_est:
2599  ctx->cplx_estimation_trash_i =
2600  ctx->cplx_estimation_trash_p =
2601  ctx->cplx_estimation_trash_b = 0;
2602  }
2603 
2604  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2605 
2606  s->data_partitioning = get_bits1(gb);
2607  if (s->data_partitioning)
2608  ctx->rvlc = get_bits1(gb);
2609 
2610  if (vo_ver_id != 1) {
2611  ctx->new_pred = get_bits1(gb);
2612  if (ctx->new_pred) {
2613  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2614  skip_bits(gb, 2); /* requested upstream message type */
2615  skip_bits1(gb); /* newpred segment type */
2616  }
2617  if (get_bits1(gb)) // reduced_res_vop
2618  av_log(s->avctx, AV_LOG_ERROR,
2619  "reduced resolution VOP not supported\n");
2620  } else {
2621  ctx->new_pred = 0;
2622  }
2623 
2624  ctx->scalability = get_bits1(gb);
2625 
2626  if (ctx->scalability) {
2627  GetBitContext bak = *gb;
2628  int h_sampling_factor_n;
2629  int h_sampling_factor_m;
2630  int v_sampling_factor_n;
2631  int v_sampling_factor_m;
2632 
2633  skip_bits1(gb); // hierarchy_type
2634  skip_bits(gb, 4); /* ref_layer_id */
2635  skip_bits1(gb); /* ref_layer_sampling_dir */
2636  h_sampling_factor_n = get_bits(gb, 5);
2637  h_sampling_factor_m = get_bits(gb, 5);
2638  v_sampling_factor_n = get_bits(gb, 5);
2639  v_sampling_factor_m = get_bits(gb, 5);
2640  ctx->enhancement_type = get_bits1(gb);
2641 
2642  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2643  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2644  /* illegal scalability header (VERY broken encoder),
2645  * trying to workaround */
2646  ctx->scalability = 0;
2647  *gb = bak;
2648  } else
2649  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2650 
2651  // bin shape stuff FIXME
2652  }
2653  }
2654 
2655  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2656  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",
2657  s->avctx->framerate.den, s->avctx->framerate.num,
2658  ctx->time_increment_bits,
2659  s->quant_precision,
2660  s->progressive_sequence,
2661  s->low_delay,
2662  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2663  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2664  );
2665  }
2666 
2667  return 0;
2668 }
2669 
2670 /**
2671  * Decode the user data stuff in the header.
2672  * Also initializes divx/xvid/lavc_version/build.
2673  */
2675 {
2676  MpegEncContext *s = &ctx->m;
2677  char buf[256];
2678  int i;
2679  int e;
2680  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2681  char last;
2682 
2683  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2684  if (show_bits(gb, 23) == 0)
2685  break;
2686  buf[i] = get_bits(gb, 8);
2687  }
2688  buf[i] = 0;
2689 
2690  /* divx detection */
2691  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2692  if (e < 2)
2693  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2694  if (e >= 2) {
2695  ctx->divx_version = ver;
2696  ctx->divx_build = build;
2697  s->divx_packed = e == 3 && last == 'p';
2698  }
2699 
2700  /* libavcodec detection */
2701  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2702  if (e != 4)
2703  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2704  if (e != 4) {
2705  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2706  if (e > 1) {
2707  if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2708  av_log(s->avctx, AV_LOG_WARNING,
2709  "Unknown Lavc version string encountered, %d.%d.%d; "
2710  "clamping sub-version values to 8-bits.\n",
2711  ver, ver2, ver3);
2712  }
2713  build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2714  }
2715  }
2716  if (e != 4) {
2717  if (strcmp(buf, "ffmpeg") == 0)
2718  ctx->lavc_build = 4600;
2719  }
2720  if (e == 4)
2721  ctx->lavc_build = build;
2722 
2723  /* Xvid detection */
2724  e = sscanf(buf, "XviD%d", &build);
2725  if (e == 1)
2726  ctx->xvid_build = build;
2727 
2728  return 0;
2729 }
2730 
2732 {
2733  Mpeg4DecContext *ctx = avctx->priv_data;
2734  MpegEncContext *s = &ctx->m;
2735 
2736  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2737  if (s->codec_tag == AV_RL32("XVID") ||
2738  s->codec_tag == AV_RL32("XVIX") ||
2739  s->codec_tag == AV_RL32("RMP4") ||
2740  s->codec_tag == AV_RL32("ZMP4") ||
2741  s->codec_tag == AV_RL32("SIPP"))
2742  ctx->xvid_build = 0;
2743  }
2744 
2745  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2746  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2747  ctx->vol_control_parameters == 0)
2748  ctx->divx_version = 400; // divx 4
2749 
2750  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2751  ctx->divx_version =
2752  ctx->divx_build = -1;
2753  }
2754 
2755  if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2756  if (s->codec_tag == AV_RL32("XVIX"))
2757  s->workaround_bugs |= FF_BUG_XVID_ILACE;
2758 
2759  if (s->codec_tag == AV_RL32("UMP4"))
2760  s->workaround_bugs |= FF_BUG_UMP4;
2761 
2762  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2763  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2764 
2765  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2766  s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2767 
2768  if (ctx->xvid_build <= 3U)
2769  s->padding_bug_score = 256 * 256 * 256 * 64;
2770 
2771  if (ctx->xvid_build <= 1U)
2772  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2773 
2774  if (ctx->xvid_build <= 12U)
2775  s->workaround_bugs |= FF_BUG_EDGE;
2776 
2777  if (ctx->xvid_build <= 32U)
2778  s->workaround_bugs |= FF_BUG_DC_CLIP;
2779 
2780 #define SET_QPEL_FUNC(postfix1, postfix2) \
2781  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2782  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2783  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2784 
2785  if (ctx->lavc_build < 4653U)
2786  s->workaround_bugs |= FF_BUG_STD_QPEL;
2787 
2788  if (ctx->lavc_build < 4655U)
2789  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2790 
2791  if (ctx->lavc_build < 4670U)
2792  s->workaround_bugs |= FF_BUG_EDGE;
2793 
2794  if (ctx->lavc_build <= 4712U)
2795  s->workaround_bugs |= FF_BUG_DC_CLIP;
2796 
2797  if ((ctx->lavc_build&0xFF) >= 100) {
2798  if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2799  (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2800  )
2801  s->workaround_bugs |= FF_BUG_IEDGE;
2802  }
2803 
2804  if (ctx->divx_version >= 0)
2805  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2806  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2807  s->padding_bug_score = 256 * 256 * 256 * 64;
2808 
2809  if (ctx->divx_version < 500U)
2810  s->workaround_bugs |= FF_BUG_EDGE;
2811 
2812  if (ctx->divx_version >= 0)
2813  s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2814  }
2815 
2816  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2817  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2818  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2819  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2820  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2821  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2822  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2823 
2824  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2825  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2826  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2827  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2828  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2829  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2830  }
2831 
2832  if (avctx->debug & FF_DEBUG_BUGS)
2833  av_log(s->avctx, AV_LOG_DEBUG,
2834  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2835  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2836  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2837 
2838  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2839  s->codec_id == AV_CODEC_ID_MPEG4 &&
2840  avctx->idct_algo == FF_IDCT_AUTO) {
2841  avctx->idct_algo = FF_IDCT_XVID;
2843  return 1;
2844  }
2845 
2846  return 0;
2847 }
2848 
2850 {
2851  MpegEncContext *s = &ctx->m;
2852  int time_incr, time_increment;
2853  int64_t pts;
2854 
2855  s->mcsel = 0;
2856  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2857  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2858  ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2859  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2860  s->low_delay = 0;
2861  }
2862 
2863  s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2864  if (s->partitioned_frame)
2865  s->decode_mb = mpeg4_decode_partitioned_mb;
2866  else
2867  s->decode_mb = mpeg4_decode_mb;
2868 
2869  time_incr = 0;
2870  while (get_bits1(gb) != 0)
2871  time_incr++;
2872 
2873  check_marker(s->avctx, gb, "before time_increment");
2874 
2875  if (ctx->time_increment_bits == 0 ||
2876  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2877  av_log(s->avctx, AV_LOG_WARNING,
2878  "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);
2879 
2880  for (ctx->time_increment_bits = 1;
2881  ctx->time_increment_bits < 16;
2882  ctx->time_increment_bits++) {
2883  if (s->pict_type == AV_PICTURE_TYPE_P ||
2884  (s->pict_type == AV_PICTURE_TYPE_S &&
2885  ctx->vol_sprite_usage == GMC_SPRITE)) {
2886  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2887  break;
2888  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2889  break;
2890  }
2891 
2892  av_log(s->avctx, AV_LOG_WARNING,
2893  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2894  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2895  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2896  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2897  }
2898  }
2899 
2900  if (IS_3IV1)
2901  time_increment = get_bits1(gb); // FIXME investigate further
2902  else
2903  time_increment = get_bits(gb, ctx->time_increment_bits);
2904 
2905  if (s->pict_type != AV_PICTURE_TYPE_B) {
2906  s->last_time_base = s->time_base;
2907  s->time_base += time_incr;
2908  s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2909  if (s->workaround_bugs & FF_BUG_UMP4) {
2910  if (s->time < s->last_non_b_time) {
2911  /* header is not mpeg-4-compatible, broken encoder,
2912  * trying to workaround */
2913  s->time_base++;
2914  s->time += s->avctx->framerate.num;
2915  }
2916  }
2917  s->pp_time = s->time - s->last_non_b_time;
2918  s->last_non_b_time = s->time;
2919  } else {
2920  s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2921  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2922  if (s->pp_time <= s->pb_time ||
2923  s->pp_time <= s->pp_time - s->pb_time ||
2924  s->pp_time <= 0) {
2925  /* messed up order, maybe after seeking? skipping current B-frame */
2926  return FRAME_SKIPPED;
2927  }
2929 
2930  if (ctx->t_frame == 0)
2931  ctx->t_frame = s->pb_time;
2932  if (ctx->t_frame == 0)
2933  ctx->t_frame = 1; // 1/0 protection
2934  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2935  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2936  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2937  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2938  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2939  s->pb_field_time = 2;
2940  s->pp_field_time = 4;
2941  if (!s->progressive_sequence)
2942  return FRAME_SKIPPED;
2943  }
2944  }
2945 
2946  if (s->avctx->framerate.den)
2947  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2948  else
2949  pts = AV_NOPTS_VALUE;
2950  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2951 
2952  check_marker(s->avctx, gb, "before vop_coded");
2953 
2954  /* vop coded */
2955  if (get_bits1(gb) != 1) {
2956  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2957  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2958  return FRAME_SKIPPED;
2959  }
2960  if (ctx->new_pred)
2961  decode_new_pred(ctx, gb);
2962 
2963  if (ctx->shape != BIN_ONLY_SHAPE &&
2964  (s->pict_type == AV_PICTURE_TYPE_P ||
2965  (s->pict_type == AV_PICTURE_TYPE_S &&
2966  ctx->vol_sprite_usage == GMC_SPRITE))) {
2967  /* rounding type for motion estimation */
2968  s->no_rounding = get_bits1(gb);
2969  } else {
2970  s->no_rounding = 0;
2971  }
2972  // FIXME reduced res stuff
2973 
2974  if (ctx->shape != RECT_SHAPE) {
2975  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2976  skip_bits(gb, 13); /* width */
2977  check_marker(s->avctx, gb, "after width");
2978  skip_bits(gb, 13); /* height */
2979  check_marker(s->avctx, gb, "after height");
2980  skip_bits(gb, 13); /* hor_spat_ref */
2981  check_marker(s->avctx, gb, "after hor_spat_ref");
2982  skip_bits(gb, 13); /* ver_spat_ref */
2983  }
2984  skip_bits1(gb); /* change_CR_disable */
2985 
2986  if (get_bits1(gb) != 0)
2987  skip_bits(gb, 8); /* constant_alpha_value */
2988  }
2989 
2990  // FIXME complexity estimation stuff
2991 
2992  if (ctx->shape != BIN_ONLY_SHAPE) {
2993  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2994  if (s->pict_type != AV_PICTURE_TYPE_I)
2995  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2996  if (s->pict_type == AV_PICTURE_TYPE_B)
2997  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2998 
2999  if (get_bits_left(gb) < 3) {
3000  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
3001  return AVERROR_INVALIDDATA;
3002  }
3003  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
3004  if (!s->progressive_sequence) {
3005  s->top_field_first = get_bits1(gb);
3006  s->alternate_scan = get_bits1(gb);
3007  } else
3008  s->alternate_scan = 0;
3009  }
3010 
3011  if (s->alternate_scan) {
3012  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3013  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3014  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3015  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3016  } else {
3017  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3018  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3019  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3020  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3021  }
3022 
3023  if (s->pict_type == AV_PICTURE_TYPE_S) {
3024  if((ctx->vol_sprite_usage == STATIC_SPRITE ||
3025  ctx->vol_sprite_usage == GMC_SPRITE)) {
3026  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
3027  return AVERROR_INVALIDDATA;
3028  if (ctx->sprite_brightness_change)
3029  av_log(s->avctx, AV_LOG_ERROR,
3030  "sprite_brightness_change not supported\n");
3031  if (ctx->vol_sprite_usage == STATIC_SPRITE)
3032  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
3033  } else {
3034  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
3035  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
3036  }
3037  }
3038 
3039  if (ctx->shape != BIN_ONLY_SHAPE) {
3040  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
3041  if (s->qscale == 0) {
3042  av_log(s->avctx, AV_LOG_ERROR,
3043  "Error, header damaged or not MPEG-4 header (qscale=0)\n");
3044  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
3045  }
3046 
3047  if (s->pict_type != AV_PICTURE_TYPE_I) {
3048  s->f_code = get_bits(gb, 3); /* fcode_for */
3049  if (s->f_code == 0) {
3050  av_log(s->avctx, AV_LOG_ERROR,
3051  "Error, header damaged or not MPEG-4 header (f_code=0)\n");
3052  s->f_code = 1;
3053  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
3054  }
3055  } else
3056  s->f_code = 1;
3057 
3058  if (s->pict_type == AV_PICTURE_TYPE_B) {
3059  s->b_code = get_bits(gb, 3);
3060  if (s->b_code == 0) {
3061  av_log(s->avctx, AV_LOG_ERROR,
3062  "Error, header damaged or not MPEG4 header (b_code=0)\n");
3063  s->b_code=1;
3064  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
3065  }
3066  } else
3067  s->b_code = 1;
3068 
3069  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
3070  av_log(s->avctx, AV_LOG_DEBUG,
3071  "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",
3072  s->qscale, s->f_code, s->b_code,
3073  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")),
3074  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
3075  s->top_field_first, s->quarter_sample ? "q" : "h",
3076  s->data_partitioning, ctx->resync_marker,
3077  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
3078  1 - s->no_rounding, s->vo_type,
3079  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
3080  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
3081  ctx->cplx_estimation_trash_b,
3082  s->time,
3083  time_increment
3084  );
3085  }
3086 
3087  if (!ctx->scalability) {
3088  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
3089  skip_bits1(gb); // vop shape coding type
3090  } else {
3091  if (ctx->enhancement_type) {
3092  int load_backward_shape = get_bits1(gb);
3093  if (load_backward_shape)
3094  av_log(s->avctx, AV_LOG_ERROR,
3095  "load backward shape isn't supported\n");
3096  }
3097  skip_bits(gb, 2); // ref_select_code
3098  }
3099  }
3100  /* detect buggy encoders which don't set the low_delay flag
3101  * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
3102  * easily (although it's buggy too) */
3103  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
3104  ctx->divx_version == -1 && s->picture_number == 0) {
3105  av_log(s->avctx, AV_LOG_WARNING,
3106  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
3107  s->low_delay = 1;
3108  }
3109 
3110  s->picture_number++; // better than pic number==0 always ;)
3111 
3112  // FIXME add short header support
3113  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
3114  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
3115 
3116  if (s->workaround_bugs & FF_BUG_EDGE) {
3117  s->h_edge_pos = s->width;
3118  s->v_edge_pos = s->height;
3119  }
3120  return 0;
3121 }
3122 
3124 {
3125  MpegEncContext *s = &ctx->m;
3126 
3127  skip_bits(gb, 16); /* Time_code[63..48] */
3128  check_marker(s->avctx, gb, "after Time_code[63..48]");
3129  skip_bits(gb, 16); /* Time_code[47..32] */
3130  check_marker(s->avctx, gb, "after Time_code[47..32]");
3131  skip_bits(gb, 16); /* Time_code[31..16] */
3132  check_marker(s->avctx, gb, "after Time_code[31..16]");
3133  skip_bits(gb, 16); /* Time_code[15..0] */
3134  check_marker(s->avctx, gb, "after Time_code[15..0]");
3135  skip_bits(gb, 4); /* reserved_bits */
3136 }
3137 
3138 /**
3139  * Decode the next studio vop header.
3140  * @return <0 if something went wrong
3141  */
3143 {
3144  MpegEncContext *s = &ctx->m;
3145 
3146  if (get_bits_left(gb) <= 32)
3147  return 0;
3148 
3149  s->partitioned_frame = 0;
3150  s->interlaced_dct = 0;
3151  s->decode_mb = mpeg4_decode_studio_mb;
3152 
3153  decode_smpte_tc(ctx, gb);
3154 
3155  skip_bits(gb, 10); /* temporal_reference */
3156  skip_bits(gb, 2); /* vop_structure */
3157  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
3158  if (get_bits1(gb)) { /* vop_coded */
3159  skip_bits1(gb); /* top_field_first */
3160  skip_bits1(gb); /* repeat_first_field */
3161  s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
3162  }
3163 
3164  if (s->pict_type == AV_PICTURE_TYPE_I) {
3165  if (get_bits1(gb))
3167  }
3168 
3169  if (ctx->shape != BIN_ONLY_SHAPE) {
3170  s->alternate_scan = get_bits1(gb);
3171  s->frame_pred_frame_dct = get_bits1(gb);
3172  s->dct_precision = get_bits(gb, 2);
3173  s->intra_dc_precision = get_bits(gb, 2);
3174  s->q_scale_type = get_bits1(gb);
3175  }
3176 
3177  if (s->alternate_scan) {
3178  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3179  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3180  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3181  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3182  } else {
3183  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3184  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3185  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3186  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3187  }
3188 
3190 
3192  extension_and_user_data(s, gb, 4);
3193 
3194  return 0;
3195 }
3196 
3198 {
3199  MpegEncContext *s = &ctx->m;
3200  int visual_object_type;
3201 
3202  skip_bits(gb, 4); /* visual_object_verid */
3203  visual_object_type = get_bits(gb, 4);
3204  if (visual_object_type != VOT_VIDEO_ID) {
3205  avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
3206  return AVERROR_PATCHWELCOME;
3207  }
3208 
3210  extension_and_user_data(s, gb, 1);
3211 
3212  return 0;
3213 }
3214 
3215 /**
3216  * Decode MPEG-4 headers.
3217  *
3218  * @param header If set the absence of a VOP is not treated as error; otherwise, it is treated as such.
3219  * @return <0 if an error occurred
3220  * FRAME_SKIPPED if a not coded VOP is found
3221  * 0 else
3222  */
3224 {
3225  MpegEncContext *s = &ctx->m;
3226  unsigned startcode, v;
3227  int ret;
3228  int vol = 0;
3229 
3230  /* search next start code */
3231  align_get_bits(gb);
3232 
3233  // If we have not switched to studio profile than we also did not switch bps
3234  // that means something else (like a previous instance) outside set bps which
3235  // would be inconsistant with the currect state, thus reset it
3236  if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
3237  s->avctx->bits_per_raw_sample = 0;
3238 
3239  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
3240  skip_bits(gb, 24);
3241  if (get_bits(gb, 8) == 0xF0)
3242  goto end;
3243  }
3244 
3245  startcode = 0xff;
3246  for (;;) {
3247  if (get_bits_count(gb) >= gb->size_in_bits) {
3248  if (gb->size_in_bits == 8 &&
3249  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
3250  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
3251  return FRAME_SKIPPED; // divx bug
3252  } else if (header && get_bits_count(gb) == gb->size_in_bits) {
3253  return 0; // ordinary return value for parsing of extradata
3254  } else
3255  return AVERROR_INVALIDDATA; // end of stream
3256  }
3257 
3258  /* use the bits after the test */
3259  v = get_bits(gb, 8);
3260  startcode = ((startcode << 8) | v) & 0xffffffff;
3261 
3262  if ((startcode & 0xFFFFFF00) != 0x100)
3263  continue; // no startcode
3264 
3265  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
3266  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
3267  if (startcode <= 0x11F)
3268  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
3269  else if (startcode <= 0x12F)
3270  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
3271  else if (startcode <= 0x13F)
3272  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3273  else if (startcode <= 0x15F)
3274  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
3275  else if (startcode <= 0x1AF)
3276  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3277  else if (startcode == 0x1B0)
3278  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
3279  else if (startcode == 0x1B1)
3280  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
3281  else if (startcode == 0x1B2)
3282  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
3283  else if (startcode == 0x1B3)
3284  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
3285  else if (startcode == 0x1B4)
3286  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
3287  else if (startcode == 0x1B5)
3288  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
3289  else if (startcode == 0x1B6)
3290  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
3291  else if (startcode == 0x1B7)
3292  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
3293  else if (startcode == 0x1B8)
3294  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
3295  else if (startcode == 0x1B9)
3296  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
3297  else if (startcode == 0x1BA)
3298  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
3299  else if (startcode == 0x1BB)
3300  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
3301  else if (startcode == 0x1BC)
3302  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
3303  else if (startcode == 0x1BD)
3304  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
3305  else if (startcode == 0x1BE)
3306  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
3307  else if (startcode == 0x1BF)
3308  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
3309  else if (startcode == 0x1C0)
3310  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
3311  else if (startcode == 0x1C1)
3312  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
3313  else if (startcode == 0x1C2)
3314  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
3315  else if (startcode == 0x1C3)
3316  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
3317  else if (startcode <= 0x1C5)
3318  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
3319  else if (startcode <= 0x1FF)
3320  av_log(s->avctx, AV_LOG_DEBUG, "System start");
3321  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
3322  }
3323 
3324  if (startcode >= 0x120 && startcode <= 0x12F) {
3325  if (vol) {
3326  av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
3327  continue;
3328  }
3329  vol++;
3330  if ((ret = decode_vol_header(ctx, gb)) < 0)
3331  return ret;
3332  } else if (startcode == USER_DATA_STARTCODE) {
3333  decode_user_data(ctx, gb);
3334  } else if (startcode == GOP_STARTCODE) {
3336  } else if (startcode == VOS_STARTCODE) {
3337  int profile, level;
3340  (level > 0 && level < 9)) {
3341  s->studio_profile = 1;
3343  extension_and_user_data(s, gb, 0);
3344  } else if (s->studio_profile) {
3345  avpriv_request_sample(s->avctx, "Mix of studio and non studio profile");
3346  return AVERROR_PATCHWELCOME;
3347  }
3348  s->avctx->profile = profile;
3349  s->avctx->level = level;
3350  } else if (startcode == VISUAL_OBJ_STARTCODE) {
3351  if (s->studio_profile) {
3352  if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
3353  return ret;
3354  } else
3356  } else if (startcode == VOP_STARTCODE) {
3357  break;
3358  }
3359 
3360  align_get_bits(gb);
3361  startcode = 0xff;
3362  }
3363 
3364 end:
3365  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
3366  s->low_delay = 1;
3367  s->avctx->has_b_frames = !s->low_delay;
3368 
3369  if (s->studio_profile) {
3370  if (!s->avctx->bits_per_raw_sample) {
3371  av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
3372  return AVERROR_INVALIDDATA;
3373  }
3374  return decode_studio_vop_header(ctx, gb);
3375  } else
3376  return decode_vop_header(ctx, gb);
3377 }
3378 
3380  static int done = 0;
3381 
3382  if (!done) {
3389  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
3390  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
3391  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
3392  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
3393  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
3394  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
3397  NULL, 0, 0, 0, 0, 128);
3399  &ff_mb_type_b_tab[0][1], 2, 1,
3400  &ff_mb_type_b_tab[0][0], 2, 1, 16);
3401  done = 1;
3402  }
3403 }
3404 
3405 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
3406 {
3407  Mpeg4DecContext *ctx = avctx->priv_data;
3408  MpegEncContext *s = &ctx->m;
3409 
3410  /* divx 5.01+ bitstream reorder stuff */
3411  /* Since this clobbers the input buffer and hwaccel codecs still need the
3412  * data during hwaccel->end_frame we should not do this any earlier */
3413  if (s->divx_packed) {
3414  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
3415  int startcode_found = 0;
3416 
3417  if (buf_size - current_pos > 7) {
3418 
3419  int i;
3420  for (i = current_pos; i < buf_size - 4; i++)
3421 
3422  if (buf[i] == 0 &&
3423  buf[i + 1] == 0 &&
3424  buf[i + 2] == 1 &&
3425  buf[i + 3] == 0xB6) {
3426  startcode_found = !(buf[i + 4] & 0x40);
3427  break;
3428  }
3429  }
3430 
3431  if (startcode_found) {
3432  if (!ctx->showed_packed_warning) {
3433  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
3434  "wasteful way to store B-frames ('packed B-frames'). "
3435  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
3436  ctx->showed_packed_warning = 1;
3437  }
3438  av_fast_padded_malloc(&s->bitstream_buffer,
3439  &s->allocated_bitstream_buffer_size,
3440  buf_size - current_pos);
3441  if (!s->bitstream_buffer) {
3442  s->bitstream_buffer_size = 0;
3443  return AVERROR(ENOMEM);
3444  }
3445  memcpy(s->bitstream_buffer, buf + current_pos,
3446  buf_size - current_pos);
3447  s->bitstream_buffer_size = buf_size - current_pos;
3448  }
3449  }
3450 
3451  return 0;
3452 }
3453 
3454 #if HAVE_THREADS
3455 static int mpeg4_update_thread_context(AVCodecContext *dst,
3456  const AVCodecContext *src)
3457 {
3458  Mpeg4DecContext *s = dst->priv_data;
3459  const Mpeg4DecContext *s1 = src->priv_data;
3460  int init = s->m.context_initialized;
3461 
3462  int ret = ff_mpeg_update_thread_context(dst, src);
3463 
3464  if (ret < 0)
3465  return ret;
3466 
3467  // copy all the necessary fields explicitly
3468  s->time_increment_bits = s1->time_increment_bits;
3469  s->shape = s1->shape;
3470  s->vol_sprite_usage = s1->vol_sprite_usage;
3471  s->sprite_brightness_change = s1->sprite_brightness_change;
3472  s->num_sprite_warping_points = s1->num_sprite_warping_points;
3473  s->rvlc = s1->rvlc;
3474  s->resync_marker = s1->resync_marker;
3475  s->t_frame = s1->t_frame;
3476  s->new_pred = s1->new_pred;
3477  s->enhancement_type = s1->enhancement_type;
3478  s->scalability = s1->scalability;
3479  s->use_intra_dc_vlc = s1->use_intra_dc_vlc;
3480  s->intra_dc_threshold = s1->intra_dc_threshold;
3481  s->divx_version = s1->divx_version;
3482  s->divx_build = s1->divx_build;
3483  s->xvid_build = s1->xvid_build;
3484  s->lavc_build = s1->lavc_build;
3485  s->showed_packed_warning = s1->showed_packed_warning;
3486  s->vol_control_parameters = s1->vol_control_parameters;
3487  s->cplx_estimation_trash_i = s1->cplx_estimation_trash_i;
3488  s->cplx_estimation_trash_p = s1->cplx_estimation_trash_p;
3489  s->cplx_estimation_trash_b = s1->cplx_estimation_trash_b;
3490  s->rgb = s1->rgb;
3491 
3492  memcpy(s->sprite_shift, s1->sprite_shift, sizeof(s1->sprite_shift));
3493  memcpy(s->sprite_traj, s1->sprite_traj, sizeof(s1->sprite_traj));
3494 
3495  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
3496  ff_xvid_idct_init(&s->m.idsp, dst);
3497 
3498  return 0;
3499 }
3500 #endif
3501 
3502 static av_cold void mpeg4_init_static(void)
3503 {
3505  &ff_mpeg4_studio_dc_luma[0][1], 2,
3506  &ff_mpeg4_studio_dc_luma[0][0], 2, 1,
3507  0, 0, 528);
3508 
3510  &ff_mpeg4_studio_dc_chroma[0][1], 2,
3511  &ff_mpeg4_studio_dc_chroma[0][0], 2, 1,
3512  0, 0, 528);
3513 
3514  for (unsigned i = 0, offset = 0; i < 12; i++) {
3515  static VLC_TYPE vlc_buf[6498][2];
3516 
3520  STUDIO_INTRA_BITS, 24,
3521  &ff_mpeg4_studio_intra[i][0][1], 2,
3522  &ff_mpeg4_studio_intra[i][0][0], 2, 1,
3525  }
3527 }
3528 
3530 {
3531  static AVOnce init_static_once = AV_ONCE_INIT;
3532  Mpeg4DecContext *ctx = avctx->priv_data;
3533  MpegEncContext *s = &ctx->m;
3534  int ret;
3535 
3536  ctx->divx_version =
3537  ctx->divx_build =
3538  ctx->xvid_build =
3539  ctx->lavc_build = -1;
3540 
3541  if ((ret = ff_h263_decode_init(avctx)) < 0)
3542  return ret;
3543 
3544  s->h263_pred = 1;
3545  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
3546  s->decode_mb = mpeg4_decode_mb;
3547  ctx->time_increment_bits = 4; /* default value for broken headers */
3548 
3550 
3551  ff_thread_once(&init_static_once, mpeg4_init_static);
3552 
3553  return 0;
3554 }
3555 
3556 #define OFFSET(x) offsetof(MpegEncContext, x)
3557 #define FLAGS AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY
3558 static const AVOption mpeg4_options[] = {
3559  {"quarter_sample", "1/4 subpel MC", OFFSET(quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
3560  {"divx_packed", "divx style packed b frames", OFFSET(divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
3561  {NULL}
3562 };
3563 
3564 static const AVClass mpeg4_class = {
3565  .class_name = "MPEG4 Video Decoder",
3566  .item_name = av_default_item_name,
3567  .option = mpeg4_options,
3568  .version = LIBAVUTIL_VERSION_INT,
3569 };
3570 
3572  .name = "mpeg4",
3573  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
3574  .type = AVMEDIA_TYPE_VIDEO,
3575  .id = AV_CODEC_ID_MPEG4,
3576  .priv_data_size = sizeof(Mpeg4DecContext),
3577  .init = decode_init,
3578  .close = ff_h263_decode_end,
3583  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
3585  .flush = ff_mpeg_flush,
3586  .max_lowres = 3,
3589  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
3590  .priv_class = &mpeg4_class,
3591  .hw_configs = (const AVCodecHWConfigInternal *const []) {
3592 #if CONFIG_MPEG4_NVDEC_HWACCEL
3593  HWACCEL_NVDEC(mpeg4),
3594 #endif
3595 #if CONFIG_MPEG4_VAAPI_HWACCEL
3596  HWACCEL_VAAPI(mpeg4),
3597 #endif
3598 #if CONFIG_MPEG4_VDPAU_HWACCEL
3599  HWACCEL_VDPAU(mpeg4),
3600 #endif
3601 #if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
3602  HWACCEL_VIDEOTOOLBOX(mpeg4),
3603 #endif
3604  NULL
3605  },
3606 };
static void flush(AVCodecContext *avctx)
#define av_uninit(x)
Definition: attributes.h:154
#define av_cold
Definition: attributes.h:88
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;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);return NULL;} return ac;} 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;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->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);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> dc
uint8_t
int32_t
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
#define FF_BUG_EDGE
Definition: avcodec.h:1582
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:1631
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:1654
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:1574
#define FF_PROFILE_UNKNOWN
Definition: avcodec.h:1859
#define FF_BUG_DC_CLIP
Definition: avcodec.h:1584
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:1583
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:1660
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:1580
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:1658
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:1581
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1624
#define FF_BUG_AMV
Definition: avcodec.h:1577
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO
Definition: avcodec.h:1932
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:1661
#define FF_BUG_UMP4
Definition: avcodec.h:1575
#define FF_IDCT_AUTO
Definition: avcodec.h:1720
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:1573
#define FF_DEBUG_BUGS
Definition: avcodec.h:1634
#define FF_IDCT_XVID
Definition: avcodec.h:1727
#define FF_BUG_IEDGE
Definition: avcodec.h:1587
#define FF_BUG_STD_QPEL
Definition: avcodec.h:1579
#define FF_BUG_NO_PADDING
Definition: avcodec.h:1576
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:1578
#define AV_RL32
Definition: intreadwrite.h:146
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
int ff_init_vlc_from_lengths(VLC *vlc_arg, int nb_bits, int nb_codes, const int8_t *lens, int lens_wrap, const void *symbols, int symbols_wrap, int symbols_size, int offset, int flags, void *logctx)
Build VLC decoding tables suitable for use with get_vlc2()
Definition: bitstream.c:381
#define s(width, name)
Definition: cbs_vp9.c:257
static VLC_TYPE vlc_buf[16716][2]
Definition: clearvideo.c:86
#define FFMIN(a, b)
Definition: common.h:105
#define av_clip
Definition: common.h:122
#define ROUNDED_DIV(a, b)
Definition: common.h:56
#define FFMAX(a, b)
Definition: common.h:103
#define RSHIFT(a, b)
Definition: common.h:54
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define CONFIG_MPEG4_DECODER
Definition: config.h:871
#define NULL
Definition: coverity.c:32
long long int64_t
Definition: coverity.c:34
#define max(a, b)
Definition: cuda_runtime.h:33
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
#define ER_DC_ERROR
#define ER_MV_ERROR
#define ER_MV_END
#define ER_DC_END
@ HWACCEL_VIDEOTOOLBOX
Definition: ffmpeg.h:62
float re
Definition: fft.c:82
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:602
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
#define GET_CACHE(name, gb)
Definition: get_bits.h:215
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:180
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:797
#define CLOSE_READER(name, gb)
Definition: get_bits.h:149
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:291
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:212
#define OPEN_READER(name, gb)
Definition: get_bits.h:138
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:193
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:738
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:178
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:199
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:538
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:185
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:612
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:693
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
Definition: get_bits.h:415
static int get_xbits(GetBitContext *s, int n)
Read MPEG-1 dc-style VLC (sign bit + mantissa with no MSB).
Definition: get_bits.h:321
@ AV_OPT_TYPE_BOOL
Definition: opt.h:242
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: codec.h:44
#define AV_CODEC_CAP_TRUNCATED
Definition: codec.h:53
#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: codec.h:77
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:325
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:108
@ AV_CODEC_ID_MPEG4
Definition: codec_id.h:61
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:50
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
@ AV_PICTURE_TYPE_S
S(GMC)-VOP MPEG-4.
Definition: avutil.h:277
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:319
#define FF_ASPECT_EXTENDED
Definition: h263.h:30
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:732
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:269
#define CBPY_VLC_BITS
Definition: h263.h:40
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:422
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:38
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:156
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:70
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:39
RLTable ff_h263_rl_inter
Definition: h263data.c:159
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:273
for(j=16;j >0;--j)
#define IS_INTRA(x, y)
#define HWACCEL_VDPAU(codec)
Definition: hwconfig.h:75
#define HWACCEL_NVDEC(codec)
Definition: hwconfig.h:71
#define HWACCEL_VAAPI(codec)
Definition: hwconfig.h:73
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
static const int16_t alpha[]
Definition: ilbcdata.h:55
int i
Definition: input.c:407
#define av_log2
Definition: intmath.h:83
#define TEX_VLC_BITS
Definition: dv.h:99
#define FF_CODEC_CAP_ALLOCATE_PROGRESS
Definition: internal.h:76
#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:61
#define ff_tlog(ctx,...)
Definition: internal.h:96
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:156
#define AVOnce
Definition: thread.h:172
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:175
#define AV_ONCE_INIT
Definition: thread.h:173
static const AVProfile profiles[]
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:309
uint8_t w
Definition: llviddspenc.c:39
int stride
Definition: mace.c:144
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
#define FASTDIV(a, b)
Definition: mathops.h:202
static VLC rl_vlc[2]
Definition: mobiclip.c:276
const uint8_t ff_sprite_trajectory_lens[15]
Definition: mpeg4data.h:326
const uint8_t ff_mpeg4_DCtab_lum[13][2]
Definition: mpeg4data.h:35
const uint8_t ff_mpeg4_studio_intra[12][24][2]
Definition: mpeg4data.h:389
RLTable ff_mpeg4_rl_intra
Definition: mpeg4data.h:109
const uint8_t ff_mb_type_b_tab[4][2]
Definition: mpeg4data.h:330
const int16_t ff_mpeg4_default_intra_matrix[64]
Definition: mpeg4data.h:335
const uint8_t ff_mpeg4_c_dc_scale_table[32]
Definition: mpeg4data.h:361
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:366
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:357
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
const uint8_t ff_mpeg4_studio_dc_chroma[19][2]
Definition: mpeg4data.h:382
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:346
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
const uint8_t ff_mpeg4_studio_dc_luma[19][2]
Definition: mpeg4data.h:375
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:370
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:71
uint8_t ff_mpeg4_static_rl_table_store[3][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg4video.c:28
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
#define QUANT_MATRIX_EXT_ID
Definition: mpeg4video.h:69
#define ADV_SIMPLE_VO_TYPE
Definition: mpeg4video.h:46
#define VOT_STILL_TEXTURE_ID
Definition: mpeg4video.h:49
#define GRAY_SHAPE
Definition: mpeg4video.h:36
#define USER_DATA_STARTCODE
Definition: mpeg4video.h:62
#define VOT_VIDEO_ID
Definition: mpeg4video.h:48
#define STATIC_SPRITE
Definition: mpeg4video.h:55
#define IS_3IV1
Definition: mpeg4video.h:188
#define SIMPLE_STUDIO_VO_TYPE
Definition: mpeg4video.h:44
#define EXT_STARTCODE
Definition: mpeg4video.h:67
#define GMC_SPRITE
Definition: mpeg4video.h:56
#define SIMPLE_VO_TYPE
Definition: mpeg4video.h:38
#define DC_MARKER
Definition: mpeg4video.h:59
#define MOTION_MARKER
Definition: mpeg4video.h:58
#define RECT_SHAPE
Definition: mpeg4video.h:33
static const uint8_t mpeg4_block_count[4]
Definition: mpeg4video.h:121
#define VOS_STARTCODE
Definition: mpeg4video.h:61
#define CORE_STUDIO_VO_TYPE
Definition: mpeg4video.h:45
#define VOP_STARTCODE
Definition: mpeg4video.h:65
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:198
#define GOP_STARTCODE
Definition: mpeg4video.h:63
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
#define VISUAL_OBJ_STARTCODE
Definition: mpeg4video.h:64
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
static void reset_studio_dc_predictors(MpegEncContext *s)
static av_cold void mpeg4_init_static(void)
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
static VLC studio_luma_dc
Definition: mpeg4videodec.c:56
AVCodec ff_mpeg4_decoder
static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
#define STUDIO_INTRA_BITS
Definition: mpeg4videodec.c:50
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the next studio vop header.
static const uint8_t ac_state_tab[22][2]
static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n)
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:54
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:49
static av_cold int decode_init(AVCodecContext *avctx)
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
decode partition C of one MB.
int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
Decode the next video packet.
#define FLAGS
static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
static VLC dc_lum
Definition: mpeg4videodec.c:52
static VLC sprite_trajectory
Definition: mpeg4videodec.c:53
static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
static void next_start_code_studio(GetBitContext *gb)
av_cold void ff_mpeg4videodec_static_init(void)
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
static const AVClass mpeg4_class
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:47
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
static VLC studio_chroma_dc
Definition: mpeg4videodec.c:57
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
static const AVOption mpeg4_options[]
#define DC_VLC_BITS
Definition: mpeg4videodec.c:48
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:59
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
static VLC dc_chrom
Definition: mpeg4videodec.c:52
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
#define SET_QPEL_FUNC(postfix1, postfix2)
static void mpeg4_load_default_matrices(MpegEncContext *s)
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
#define OFFSET(x)
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header)
Decode MPEG-4 headers.
static VLC studio_intra_tab[12]
Definition: mpeg4videodec.c:55
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:71
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
static int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block, int n, int coded, int intra, int rvlc)
Decode a block.
static int mpeg4_is_resync(Mpeg4DecContext *ctx)
check if the next stuff is a resync marker or the end.
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
#define MB_TYPE_8x8
Definition: mpegutils.h:57
#define MB_TYPE_GMC
Definition: mpegutils.h:61
#define IS_ACPRED(a)
Definition: mpegutils.h:94
#define IS_DIRECT(a)
Definition: mpegutils.h:84
#define MB_TYPE_SKIP
Definition: mpegutils.h:62
#define MB_TYPE_L1
Definition: mpegutils.h:68
#define MB_TYPE_INTRA
Definition: mpegutils.h:73
#define MB_TYPE_L0L1
Definition: mpegutils.h:69
#define MB_TYPE_DIRECT2
Definition: mpegutils.h:59
#define USES_LIST(a, list)
Definition: mpegutils.h:99
#define MB_TYPE_16x8
Definition: mpegutils.h:55
#define IS_8X8(a)
Definition: mpegutils.h:89
#define MB_TYPE_INTERLACED
Definition: mpegutils.h:58
#define MB_TYPE_16x16
Definition: mpegutils.h:54
#define MB_TYPE_ACPRED
Definition: mpegutils.h:60
#define MB_TYPE_L0
Definition: mpegutils.h:67
#define FRAME_SKIPPED
Return value for header parsers if frame is not coded.
Definition: mpegutils.h:34
#define IS_SKIP(a)
Definition: mpegutils.h:81
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2300
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:331
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2331
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2267
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:524
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:1904
mpegvideo header.
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:263
#define SLICE_START_CODE
Definition: mpegvideo.h:75
#define SLICE_END
end marker found
Definition: mpegvideo.h:523
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:524
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:269
#define MV_TYPE_8X8
4 vectors (H.263, MPEG-4 4MV)
Definition: mpegvideo.h:267
static int mpeg_get_qscale(MpegEncContext *s)
Definition: mpegvideo.h:774
#define CHROMA_420
Definition: mpegvideo.h:488
#define SLICE_OK
Definition: mpegvideo.h:521
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (MPEG-4)
Definition: mpegvideo.h:264
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
#define CHROMA_422
Definition: mpegvideo.h:489
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:750
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideodata.c:84
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideodata.c:95
AVOptions.
@ AVCHROMA_LOC_LEFT
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
Definition: pixfmt.h:607
@ AVCOL_RANGE_MPEG
Narrow or limited range content.
Definition: pixfmt.h:569
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:586
#define AV_PIX_FMT_GBRP10
Definition: pixfmt.h:415
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:400
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:402
const AVProfile ff_mpeg4_video_profiles[]
Definition: profiles.c:111
void ff_thread_await_progress(ThreadFrame *f, int n, int field)
Wait for earlier decoding threads to finish reference pictures.
mfxU16 profile
Definition: qsvenc.c:45
#define s1
Definition: regdef.h:38
av_cold void ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:28
#define MAX_LEVEL
Definition: rl.h:36
#define MAX_RUN
Definition: rl.h:35
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:58
#define INIT_FIRST_VLC_RL(rl, static_size)
Definition: rl.h:71
static const uint8_t header[24]
Definition: sdr2.c:67
static const SheerTable rgb[2]
#define FF_ARRAY_ELEMS(a)
static int shift(int a, int b)
Definition: sonic.c:82
const uint8_t * code
Definition: spdifenc.c:413
unsigned int pos
Definition: spdifenc.c:412
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
main external API structure.
Definition: avcodec.h:536
int debug
debug
Definition: avcodec.h:1623
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1719
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1178
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
AVOption.
Definition: opt.h:248
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int size_in_bits
Definition: get_bits.h:68
MpegEncContext.
Definition: mpegvideo.h:81
RLTable.
Definition: rl.h:39
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:47
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:46
Definition: vlc.h:26
int table_size
Definition: vlc.h:29
int table_allocated
Definition: vlc.h:29
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
Definition: rpzaenc.c:58
uint8_t run
Definition: svq3.c:205
uint8_t level
Definition: svq3.c:206
#define ff_dlog(a,...)
#define avpriv_request_sample(...)
#define av_log(a,...)
#define src
Definition: vp8dsp.c:255
static int16_t block[64]
Definition: dct.c:116
AVFormatContext * ctx
Definition: movenc.c:48
#define height
#define width
static int64_t pts
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
const char * r
Definition: vf_curves.c:116
if(ret< 0)
Definition: vf_mcdeint.c:282
static const uint8_t offset[127][2]
Definition: vf_spp.c:107
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:120
#define INIT_VLC_STATIC_OVERLONG
Definition: vlc.h:96
#define INIT_VLC_STATIC_FROM_LENGTHS(vlc, bits, nb_codes, lens, len_wrap, symbols, symbols_wrap, symbols_size, offset, flags, static_size)
Definition: vlc.h:126
#define VLC_TYPE
Definition: vlc.h:24
float delta
float min
int len
uint8_t bits
Definition: vp3data.h:141
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333