FFmpeg  4.4.4
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  }
353  /* try to simplify the situation */
354  if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
355  sprite_delta[0][1] == 0 &&
356  sprite_delta[1][0] == 0 &&
357  sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
358  sprite_offset[0][0] >>= ctx->sprite_shift[0];
359  sprite_offset[0][1] >>= ctx->sprite_shift[0];
360  sprite_offset[1][0] >>= ctx->sprite_shift[1];
361  sprite_offset[1][1] >>= ctx->sprite_shift[1];
362  sprite_delta[0][0] = a;
363  sprite_delta[0][1] = 0;
364  sprite_delta[1][0] = 0;
365  sprite_delta[1][1] = a;
366  ctx->sprite_shift[0] = 0;
367  ctx->sprite_shift[1] = 0;
368  s->real_sprite_warping_points = 1;
369  } else {
370  int shift_y = 16 - ctx->sprite_shift[0];
371  int shift_c = 16 - ctx->sprite_shift[1];
372 
373  for (i = 0; i < 2; i++) {
374  if (shift_c < 0 || shift_y < 0 ||
375  FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
376  FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
377  FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
378  FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
379  ) {
380  avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
381  goto overflow;
382  }
383  }
384 
385  for (i = 0; i < 2; i++) {
386  sprite_offset[0][i] *= 1 << shift_y;
387  sprite_offset[1][i] *= 1 << shift_c;
388  sprite_delta[0][i] *= 1 << shift_y;
389  sprite_delta[1][i] *= 1 << shift_y;
390  ctx->sprite_shift[i] = 16;
391 
392  }
393  for (i = 0; i < 2; i++) {
394  int64_t sd[2] = {
395  sprite_delta[i][0] - a * (1LL<<16),
396  sprite_delta[i][1] - a * (1LL<<16)
397  };
398 
399  if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
400  llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
401  llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
402  llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
403  llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
404  llabs(sd[0]) >= INT_MAX ||
405  llabs(sd[1]) >= INT_MAX ||
406  llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
407  llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
408  llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
409  ) {
410  avpriv_request_sample(s->avctx, "Overflow on sprite points");
411  goto overflow;
412  }
413  }
414  s->real_sprite_warping_points = ctx->num_sprite_warping_points;
415  }
416 
417  for (i = 0; i < 4; i++) {
418  s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
419  s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
420  }
421 
422  return 0;
423 overflow:
424  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
425  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
426  return AVERROR_PATCHWELCOME;
427 }
428 
430  MpegEncContext *s = &ctx->m;
431  int len = FFMIN(ctx->time_increment_bits + 3, 15);
432 
433  get_bits(gb, len);
434  if (get_bits1(gb))
435  get_bits(gb, len);
436  check_marker(s->avctx, gb, "after new_pred");
437 
438  return 0;
439 }
440 
441 /**
442  * Decode the next video packet.
443  * @return <0 if something went wrong
444  */
446 {
447  MpegEncContext *s = &ctx->m;
448 
449  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
450  int header_extension = 0, mb_num, len;
451 
452  /* is there enough space left for a video packet + header */
453  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
454  return AVERROR_INVALIDDATA;
455 
456  for (len = 0; len < 32; len++)
457  if (get_bits1(&s->gb))
458  break;
459 
461  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
462  return AVERROR_INVALIDDATA;
463  }
464 
465  if (ctx->shape != RECT_SHAPE) {
466  header_extension = get_bits1(&s->gb);
467  // FIXME more stuff here
468  }
469 
470  mb_num = get_bits(&s->gb, mb_num_bits);
471  if (mb_num >= s->mb_num || !mb_num) {
472  av_log(s->avctx, AV_LOG_ERROR,
473  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
474  return AVERROR_INVALIDDATA;
475  }
476 
477  s->mb_x = mb_num % s->mb_width;
478  s->mb_y = mb_num / s->mb_width;
479 
480  if (ctx->shape != BIN_ONLY_SHAPE) {
481  int qscale = get_bits(&s->gb, s->quant_precision);
482  if (qscale)
483  s->chroma_qscale = s->qscale = qscale;
484  }
485 
486  if (ctx->shape == RECT_SHAPE)
487  header_extension = get_bits1(&s->gb);
488 
489  if (header_extension) {
490  int time_incr = 0;
491 
492  while (get_bits1(&s->gb) != 0)
493  time_incr++;
494 
495  check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
496  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
497  check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
498 
499  skip_bits(&s->gb, 2); /* vop coding type */
500  // FIXME not rect stuff here
501 
502  if (ctx->shape != BIN_ONLY_SHAPE) {
503  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
504  // FIXME don't just ignore everything
505  if (s->pict_type == AV_PICTURE_TYPE_S &&
506  ctx->vol_sprite_usage == GMC_SPRITE) {
507  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
508  return AVERROR_INVALIDDATA;
509  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
510  }
511 
512  // FIXME reduced res stuff here
513 
514  if (s->pict_type != AV_PICTURE_TYPE_I) {
515  int f_code = get_bits(&s->gb, 3); /* fcode_for */
516  if (f_code == 0)
517  av_log(s->avctx, AV_LOG_ERROR,
518  "Error, video packet header damaged (f_code=0)\n");
519  }
520  if (s->pict_type == AV_PICTURE_TYPE_B) {
521  int b_code = get_bits(&s->gb, 3);
522  if (b_code == 0)
523  av_log(s->avctx, AV_LOG_ERROR,
524  "Error, video packet header damaged (b_code=0)\n");
525  }
526  }
527  }
528  if (ctx->new_pred)
529  decode_new_pred(ctx, &s->gb);
530 
531  return 0;
532 }
533 
535 {
536  /* Reset DC Predictors */
537  s->last_dc[0] =
538  s->last_dc[1] =
539  s->last_dc[2] = 1 << (s->avctx->bits_per_raw_sample + s->dct_precision + s->intra_dc_precision - 1);
540 }
541 
542 /**
543  * Decode the next video packet.
544  * @return <0 if something went wrong
545  */
547 {
548  MpegEncContext *s = &ctx->m;
549  GetBitContext *gb = &s->gb;
550  unsigned vlc_len;
551  uint16_t mb_num;
552 
553  if (get_bits_left(gb) >= 32 && get_bits_long(gb, 32) == SLICE_START_CODE) {
554  vlc_len = av_log2(s->mb_width * s->mb_height) + 1;
555  mb_num = get_bits(gb, vlc_len);
556 
557  if (mb_num >= s->mb_num)
558  return AVERROR_INVALIDDATA;
559 
560  s->mb_x = mb_num % s->mb_width;
561  s->mb_y = mb_num / s->mb_width;
562 
563  if (ctx->shape != BIN_ONLY_SHAPE)
564  s->qscale = mpeg_get_qscale(s);
565 
566  if (get_bits1(gb)) { /* slice_extension_flag */
567  skip_bits1(gb); /* intra_slice */
568  skip_bits1(gb); /* slice_VOP_id_enable */
569  skip_bits(gb, 6); /* slice_VOP_id */
570  while (get_bits1(gb)) /* extra_bit_slice */
571  skip_bits(gb, 8); /* extra_information_slice */
572  }
573 
575  }
576  else {
577  return AVERROR_INVALIDDATA;
578  }
579 
580  return 0;
581 }
582 
583 /**
584  * Get the average motion vector for a GMC MB.
585  * @param n either 0 for the x component or 1 for y
586  * @return the average MV for a GMC MB
587  */
588 static inline int get_amv(Mpeg4DecContext *ctx, int n)
589 {
590  MpegEncContext *s = &ctx->m;
591  int x, y, mb_v, sum, dx, dy, shift;
592  int len = 1 << (s->f_code + 4);
593  const int a = s->sprite_warping_accuracy;
594 
595  if (s->workaround_bugs & FF_BUG_AMV)
596  len >>= s->quarter_sample;
597 
598  if (s->real_sprite_warping_points == 1) {
599  if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
600  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
601  else
602  sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
603  } else {
604  dx = s->sprite_delta[n][0];
605  dy = s->sprite_delta[n][1];
606  shift = ctx->sprite_shift[0];
607  if (n)
608  dy -= 1 << (shift + a + 1);
609  else
610  dx -= 1 << (shift + a + 1);
611  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16U + dy * s->mb_y * 16U;
612 
613  sum = 0;
614  for (y = 0; y < 16; y++) {
615  int v;
616 
617  v = mb_v + dy * y;
618  // FIXME optimize
619  for (x = 0; x < 16; x++) {
620  sum += v >> shift;
621  v += dx;
622  }
623  }
624  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
625  }
626 
627  if (sum < -len)
628  sum = -len;
629  else if (sum >= len)
630  sum = len - 1;
631 
632  return sum;
633 }
634 
635 /**
636  * Decode the dc value.
637  * @param n block index (0-3 are luma, 4-5 are chroma)
638  * @param dir_ptr the prediction direction will be stored here
639  * @return the quantized dc
640  */
641 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
642 {
643  int level, code;
644 
645  if (n < 4)
646  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
647  else
648  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
649 
650  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
651  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
652  return AVERROR_INVALIDDATA;
653  }
654 
655  if (code == 0) {
656  level = 0;
657  } else {
658  if (IS_3IV1) {
659  if (code == 1)
660  level = 2 * get_bits1(&s->gb) - 1;
661  else {
662  if (get_bits1(&s->gb))
663  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
664  else
665  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
666  }
667  } else {
668  level = get_xbits(&s->gb, code);
669  }
670 
671  if (code > 8) {
672  if (get_bits1(&s->gb) == 0) { /* marker */
673  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
674  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
675  return AVERROR_INVALIDDATA;
676  }
677  }
678  }
679  }
680 
681  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
682 }
683 
684 /**
685  * Decode first partition.
686  * @return number of MBs decoded or <0 if an error occurred
687  */
689 {
690  MpegEncContext *s = &ctx->m;
691  int mb_num = 0;
692  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
693 
694  /* decode first partition */
695  s->first_slice_line = 1;
696  for (; s->mb_y < s->mb_height; s->mb_y++) {
698  for (; s->mb_x < s->mb_width; s->mb_x++) {
699  const int xy = s->mb_x + s->mb_y * s->mb_stride;
700  int cbpc;
701  int dir = 0;
702 
703  mb_num++;
705  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
706  s->first_slice_line = 0;
707 
708  if (s->pict_type == AV_PICTURE_TYPE_I) {
709  int i;
710 
711  do {
712  if (show_bits(&s->gb, 19) == DC_MARKER)
713  return mb_num - 1;
714 
716  if (cbpc < 0) {
717  av_log(s->avctx, AV_LOG_ERROR,
718  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
719  return AVERROR_INVALIDDATA;
720  }
721  } while (cbpc == 8);
722 
723  s->cbp_table[xy] = cbpc & 3;
724  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
725  s->mb_intra = 1;
726 
727  if (cbpc & 4)
728  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
729 
730  s->current_picture.qscale_table[xy] = s->qscale;
731 
732  s->mbintra_table[xy] = 1;
733  for (i = 0; i < 6; i++) {
734  int dc_pred_dir;
735  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
736  if (dc < 0) {
737  av_log(s->avctx, AV_LOG_ERROR,
738  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
739  return dc;
740  }
741  dir <<= 1;
742  if (dc_pred_dir)
743  dir |= 1;
744  }
745  s->pred_dir_table[xy] = dir;
746  } else { /* P/S_TYPE */
747  int mx, my, pred_x, pred_y, bits;
748  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
749  const int stride = s->b8_stride * 2;
750 
751 try_again:
752  bits = show_bits(&s->gb, 17);
753  if (bits == MOTION_MARKER)
754  return mb_num - 1;
755 
756  skip_bits1(&s->gb);
757  if (bits & 0x10000) {
758  /* skip mb */
759  if (s->pict_type == AV_PICTURE_TYPE_S &&
760  ctx->vol_sprite_usage == GMC_SPRITE) {
761  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
762  MB_TYPE_16x16 |
763  MB_TYPE_GMC |
764  MB_TYPE_L0;
765  mx = get_amv(ctx, 0);
766  my = get_amv(ctx, 1);
767  } else {
768  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
769  MB_TYPE_16x16 |
770  MB_TYPE_L0;
771  mx = my = 0;
772  }
773  mot_val[0] =
774  mot_val[2] =
775  mot_val[0 + stride] =
776  mot_val[2 + stride] = mx;
777  mot_val[1] =
778  mot_val[3] =
779  mot_val[1 + stride] =
780  mot_val[3 + stride] = my;
781 
782  if (s->mbintra_table[xy])
784  continue;
785  }
786 
788  if (cbpc < 0) {
789  av_log(s->avctx, AV_LOG_ERROR,
790  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
791  return AVERROR_INVALIDDATA;
792  }
793  if (cbpc == 20)
794  goto try_again;
795 
796  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
797 
798  s->mb_intra = ((cbpc & 4) != 0);
799 
800  if (s->mb_intra) {
801  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
802  s->mbintra_table[xy] = 1;
803  mot_val[0] =
804  mot_val[2] =
805  mot_val[0 + stride] =
806  mot_val[2 + stride] = 0;
807  mot_val[1] =
808  mot_val[3] =
809  mot_val[1 + stride] =
810  mot_val[3 + stride] = 0;
811  } else {
812  if (s->mbintra_table[xy])
814 
815  if (s->pict_type == AV_PICTURE_TYPE_S &&
816  ctx->vol_sprite_usage == GMC_SPRITE &&
817  (cbpc & 16) == 0)
818  s->mcsel = get_bits1(&s->gb);
819  else
820  s->mcsel = 0;
821 
822  if ((cbpc & 16) == 0) {
823  /* 16x16 motion prediction */
824 
825  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
826  if (!s->mcsel) {
827  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
828  if (mx >= 0xffff)
829  return AVERROR_INVALIDDATA;
830 
831  my = ff_h263_decode_motion(s, pred_y, s->f_code);
832  if (my >= 0xffff)
833  return AVERROR_INVALIDDATA;
834  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
835  MB_TYPE_L0;
836  } else {
837  mx = get_amv(ctx, 0);
838  my = get_amv(ctx, 1);
839  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
840  MB_TYPE_GMC |
841  MB_TYPE_L0;
842  }
843 
844  mot_val[0] =
845  mot_val[2] =
846  mot_val[0 + stride] =
847  mot_val[2 + stride] = mx;
848  mot_val[1] =
849  mot_val[3] =
850  mot_val[1 + stride] =
851  mot_val[3 + stride] = my;
852  } else {
853  int i;
854  s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
855  MB_TYPE_L0;
856  for (i = 0; i < 4; i++) {
857  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
858  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
859  if (mx >= 0xffff)
860  return AVERROR_INVALIDDATA;
861 
862  my = ff_h263_decode_motion(s, pred_y, s->f_code);
863  if (my >= 0xffff)
864  return AVERROR_INVALIDDATA;
865  mot_val[0] = mx;
866  mot_val[1] = my;
867  }
868  }
869  }
870  }
871  }
872  s->mb_x = 0;
873  }
874 
875  return mb_num;
876 }
877 
878 /**
879  * decode second partition.
880  * @return <0 if an error occurred
881  */
882 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
883 {
884  int mb_num = 0;
885  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
886 
887  s->mb_x = s->resync_mb_x;
888  s->first_slice_line = 1;
889  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
891  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
892  const int xy = s->mb_x + s->mb_y * s->mb_stride;
893 
894  mb_num++;
896  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
897  s->first_slice_line = 0;
898 
899  if (s->pict_type == AV_PICTURE_TYPE_I) {
900  int ac_pred = get_bits1(&s->gb);
901  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
902  if (cbpy < 0) {
903  av_log(s->avctx, AV_LOG_ERROR,
904  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
905  return AVERROR_INVALIDDATA;
906  }
907 
908  s->cbp_table[xy] |= cbpy << 2;
909  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
910  } else { /* P || S_TYPE */
911  if (IS_INTRA(s->current_picture.mb_type[xy])) {
912  int i;
913  int dir = 0;
914  int ac_pred = get_bits1(&s->gb);
915  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
916 
917  if (cbpy < 0) {
918  av_log(s->avctx, AV_LOG_ERROR,
919  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
920  return AVERROR_INVALIDDATA;
921  }
922 
923  if (s->cbp_table[xy] & 8)
924  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
925  s->current_picture.qscale_table[xy] = s->qscale;
926 
927  for (i = 0; i < 6; i++) {
928  int dc_pred_dir;
929  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
930  if (dc < 0) {
931  av_log(s->avctx, AV_LOG_ERROR,
932  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
933  return dc;
934  }
935  dir <<= 1;
936  if (dc_pred_dir)
937  dir |= 1;
938  }
939  s->cbp_table[xy] &= 3; // remove dquant
940  s->cbp_table[xy] |= cbpy << 2;
941  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
942  s->pred_dir_table[xy] = dir;
943  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
944  s->current_picture.qscale_table[xy] = s->qscale;
945  s->cbp_table[xy] = 0;
946  } else {
947  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
948 
949  if (cbpy < 0) {
950  av_log(s->avctx, AV_LOG_ERROR,
951  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
952  return AVERROR_INVALIDDATA;
953  }
954 
955  if (s->cbp_table[xy] & 8)
956  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
957  s->current_picture.qscale_table[xy] = s->qscale;
958 
959  s->cbp_table[xy] &= 3; // remove dquant
960  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
961  }
962  }
963  }
964  if (mb_num >= mb_count)
965  return 0;
966  s->mb_x = 0;
967  }
968  return 0;
969 }
970 
971 /**
972  * Decode the first and second partition.
973  * @return <0 if error (and sets error type in the error_status_table)
974  */
976 {
977  MpegEncContext *s = &ctx->m;
978  int mb_num;
979  int ret;
980  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
981  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
982 
983  mb_num = mpeg4_decode_partition_a(ctx);
984  if (mb_num <= 0) {
985  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
986  s->mb_x, s->mb_y, part_a_error);
987  return mb_num ? mb_num : AVERROR_INVALIDDATA;
988  }
989 
990  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
991  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
992  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
993  s->mb_x, s->mb_y, part_a_error);
994  return AVERROR_INVALIDDATA;
995  }
996 
997  s->mb_num_left = mb_num;
998 
999  if (s->pict_type == AV_PICTURE_TYPE_I) {
1000  while (show_bits(&s->gb, 9) == 1)
1001  skip_bits(&s->gb, 9);
1002  if (get_bits(&s->gb, 19) != DC_MARKER) {
1003  av_log(s->avctx, AV_LOG_ERROR,
1004  "marker missing after first I partition at %d %d\n",
1005  s->mb_x, s->mb_y);
1006  return AVERROR_INVALIDDATA;
1007  }
1008  } else {
1009  while (show_bits(&s->gb, 10) == 1)
1010  skip_bits(&s->gb, 10);
1011  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
1012  av_log(s->avctx, AV_LOG_ERROR,
1013  "marker missing after first P partition at %d %d\n",
1014  s->mb_x, s->mb_y);
1015  return AVERROR_INVALIDDATA;
1016  }
1017  }
1018  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1019  s->mb_x - 1, s->mb_y, part_a_end);
1020 
1021  ret = mpeg4_decode_partition_b(s, mb_num);
1022  if (ret < 0) {
1023  if (s->pict_type == AV_PICTURE_TYPE_P)
1024  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1025  s->mb_x, s->mb_y, ER_DC_ERROR);
1026  return ret;
1027  } else {
1028  if (s->pict_type == AV_PICTURE_TYPE_P)
1029  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1030  s->mb_x - 1, s->mb_y, ER_DC_END);
1031  }
1032 
1033  return 0;
1034 }
1035 
1036 /**
1037  * Decode a block.
1038  * @return <0 if an error occurred
1039  */
1040 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
1041  int n, int coded, int intra, int rvlc)
1042 {
1043  MpegEncContext *s = &ctx->m;
1044  int level, i, last, run, qmul, qadd;
1045  int av_uninit(dc_pred_dir);
1046  RLTable *rl;
1048  const uint8_t *scan_table;
1049 
1050  // Note intra & rvlc should be optimized away if this is inlined
1051 
1052  if (intra) {
1053  if (ctx->use_intra_dc_vlc) {
1054  /* DC coef */
1055  if (s->partitioned_frame) {
1056  level = s->dc_val[0][s->block_index[n]];
1057  if (n < 4)
1058  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1059  else
1060  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1061  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1062  } else {
1063  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1064  if (level < 0)
1065  return level;
1066  }
1067  block[0] = level;
1068  i = 0;
1069  } else {
1070  i = -1;
1071  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1072  }
1073  if (!coded)
1074  goto not_coded;
1075 
1076  if (rvlc) {
1077  rl = &ff_rvlc_rl_intra;
1079  } else {
1080  rl = &ff_mpeg4_rl_intra;
1082  }
1083  if (s->ac_pred) {
1084  if (dc_pred_dir == 0)
1085  scan_table = s->intra_v_scantable.permutated; /* left */
1086  else
1087  scan_table = s->intra_h_scantable.permutated; /* top */
1088  } else {
1089  scan_table = s->intra_scantable.permutated;
1090  }
1091  qmul = 1;
1092  qadd = 0;
1093  } else {
1094  i = -1;
1095  if (!coded) {
1096  s->block_last_index[n] = i;
1097  return 0;
1098  }
1099  if (rvlc)
1100  rl = &ff_rvlc_rl_inter;
1101  else
1102  rl = &ff_h263_rl_inter;
1103 
1104  scan_table = s->intra_scantable.permutated;
1105 
1106  if (s->mpeg_quant) {
1107  qmul = 1;
1108  qadd = 0;
1109  if (rvlc)
1111  else
1113  } else {
1114  qmul = s->qscale << 1;
1115  qadd = (s->qscale - 1) | 1;
1116  if (rvlc)
1117  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1118  else
1119  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1120  }
1121  }
1122  {
1123  OPEN_READER(re, &s->gb);
1124  for (;;) {
1125  UPDATE_CACHE(re, &s->gb);
1126  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1127  if (level == 0) {
1128  /* escape */
1129  if (rvlc) {
1130  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1131  av_log(s->avctx, AV_LOG_ERROR,
1132  "1. marker bit missing in rvlc esc\n");
1133  return AVERROR_INVALIDDATA;
1134  }
1135  SKIP_CACHE(re, &s->gb, 1);
1136 
1137  last = SHOW_UBITS(re, &s->gb, 1);
1138  SKIP_CACHE(re, &s->gb, 1);
1139  run = SHOW_UBITS(re, &s->gb, 6);
1140  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1141  UPDATE_CACHE(re, &s->gb);
1142 
1143  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1144  av_log(s->avctx, AV_LOG_ERROR,
1145  "2. marker bit missing in rvlc esc\n");
1146  return AVERROR_INVALIDDATA;
1147  }
1148  SKIP_CACHE(re, &s->gb, 1);
1149 
1150  level = SHOW_UBITS(re, &s->gb, 11);
1151  SKIP_CACHE(re, &s->gb, 11);
1152 
1153  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1154  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1155  return AVERROR_INVALIDDATA;
1156  }
1157  SKIP_CACHE(re, &s->gb, 5);
1158 
1159  level = level * qmul + qadd;
1160  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1161  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1162 
1163  i += run + 1;
1164  if (last)
1165  i += 192;
1166  } else {
1167  int cache;
1168  cache = GET_CACHE(re, &s->gb);
1169 
1170  if (IS_3IV1)
1171  cache ^= 0xC0000000;
1172 
1173  if (cache & 0x80000000) {
1174  if (cache & 0x40000000) {
1175  /* third escape */
1176  SKIP_CACHE(re, &s->gb, 2);
1177  last = SHOW_UBITS(re, &s->gb, 1);
1178  SKIP_CACHE(re, &s->gb, 1);
1179  run = SHOW_UBITS(re, &s->gb, 6);
1180  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1181  UPDATE_CACHE(re, &s->gb);
1182 
1183  if (IS_3IV1) {
1184  level = SHOW_SBITS(re, &s->gb, 12);
1185  LAST_SKIP_BITS(re, &s->gb, 12);
1186  } else {
1187  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1188  av_log(s->avctx, AV_LOG_ERROR,
1189  "1. marker bit missing in 3. esc\n");
1190  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1191  return AVERROR_INVALIDDATA;
1192  }
1193  SKIP_CACHE(re, &s->gb, 1);
1194 
1195  level = SHOW_SBITS(re, &s->gb, 12);
1196  SKIP_CACHE(re, &s->gb, 12);
1197 
1198  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1199  av_log(s->avctx, AV_LOG_ERROR,
1200  "2. marker bit missing in 3. esc\n");
1201  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1202  return AVERROR_INVALIDDATA;
1203  }
1204 
1205  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1206  }
1207 
1208 #if 0
1209  if (s->error_recognition >= FF_ER_COMPLIANT) {
1210  const int abs_level= FFABS(level);
1211  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1212  const int run1= run - rl->max_run[last][abs_level] - 1;
1213  if (abs_level <= rl->max_level[last][run]) {
1214  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1215  return AVERROR_INVALIDDATA;
1216  }
1217  if (s->error_recognition > FF_ER_COMPLIANT) {
1218  if (abs_level <= rl->max_level[last][run]*2) {
1219  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1220  return AVERROR_INVALIDDATA;
1221  }
1222  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1223  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1224  return AVERROR_INVALIDDATA;
1225  }
1226  }
1227  }
1228  }
1229 #endif
1230  if (level > 0)
1231  level = level * qmul + qadd;
1232  else
1233  level = level * qmul - qadd;
1234 
1235  if ((unsigned)(level + 2048) > 4095) {
1236  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1237  if (level > 2560 || level < -2560) {
1238  av_log(s->avctx, AV_LOG_ERROR,
1239  "|level| overflow in 3. esc, qp=%d\n",
1240  s->qscale);
1241  return AVERROR_INVALIDDATA;
1242  }
1243  }
1244  level = level < 0 ? -2048 : 2047;
1245  }
1246 
1247  i += run + 1;
1248  if (last)
1249  i += 192;
1250  } else {
1251  /* second escape */
1252  SKIP_BITS(re, &s->gb, 2);
1253  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1254  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1255  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1256  LAST_SKIP_BITS(re, &s->gb, 1);
1257  }
1258  } else {
1259  /* first escape */
1260  SKIP_BITS(re, &s->gb, 1);
1261  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1262  i += run;
1263  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1264  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1265  LAST_SKIP_BITS(re, &s->gb, 1);
1266  }
1267  }
1268  } else {
1269  i += run;
1270  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1271  LAST_SKIP_BITS(re, &s->gb, 1);
1272  }
1273  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1274  if (i > 62) {
1275  i -= 192;
1276  if (i & (~63)) {
1277  av_log(s->avctx, AV_LOG_ERROR,
1278  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1279  return AVERROR_INVALIDDATA;
1280  }
1281 
1282  block[scan_table[i]] = level;
1283  break;
1284  }
1285 
1286  block[scan_table[i]] = level;
1287  }
1288  CLOSE_READER(re, &s->gb);
1289  }
1290 
1291 not_coded:
1292  if (intra) {
1293  if (!ctx->use_intra_dc_vlc) {
1294  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1295 
1296  i -= i >> 31; // if (i == -1) i = 0;
1297  }
1298 
1299  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1300  if (s->ac_pred)
1301  i = 63; // FIXME not optimal
1302  }
1303  s->block_last_index[n] = i;
1304  return 0;
1305 }
1306 
1307 /**
1308  * decode partition C of one MB.
1309  * @return <0 if an error occurred
1310  */
1312 {
1313  Mpeg4DecContext *ctx = s->avctx->priv_data;
1314  int cbp, mb_type;
1315  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1316 
1317  av_assert2(s == (void*)ctx);
1318 
1319  mb_type = s->current_picture.mb_type[xy];
1320  cbp = s->cbp_table[xy];
1321 
1322  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1323 
1324  if (s->current_picture.qscale_table[xy] != s->qscale)
1325  ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1326 
1327  if (s->pict_type == AV_PICTURE_TYPE_P ||
1328  s->pict_type == AV_PICTURE_TYPE_S) {
1329  int i;
1330  for (i = 0; i < 4; i++) {
1331  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1332  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1333  }
1334  s->mb_intra = IS_INTRA(mb_type);
1335 
1336  if (IS_SKIP(mb_type)) {
1337  /* skip mb */
1338  for (i = 0; i < 6; i++)
1339  s->block_last_index[i] = -1;
1340  s->mv_dir = MV_DIR_FORWARD;
1341  s->mv_type = MV_TYPE_16X16;
1342  if (s->pict_type == AV_PICTURE_TYPE_S
1343  && ctx->vol_sprite_usage == GMC_SPRITE) {
1344  s->mcsel = 1;
1345  s->mb_skipped = 0;
1346  } else {
1347  s->mcsel = 0;
1348  s->mb_skipped = 1;
1349  }
1350  } else if (s->mb_intra) {
1351  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1352  } else if (!s->mb_intra) {
1353  // s->mcsel = 0; // FIXME do we need to init that?
1354 
1355  s->mv_dir = MV_DIR_FORWARD;
1356  if (IS_8X8(mb_type)) {
1357  s->mv_type = MV_TYPE_8X8;
1358  } else {
1359  s->mv_type = MV_TYPE_16X16;
1360  }
1361  }
1362  } else { /* I-Frame */
1363  s->mb_intra = 1;
1364  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1365  }
1366 
1367  if (!IS_SKIP(mb_type)) {
1368  int i;
1369  s->bdsp.clear_blocks(s->block[0]);
1370  /* decode each block */
1371  for (i = 0; i < 6; i++) {
1372  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1373  av_log(s->avctx, AV_LOG_ERROR,
1374  "texture corrupted at %d %d %d\n",
1375  s->mb_x, s->mb_y, s->mb_intra);
1376  return AVERROR_INVALIDDATA;
1377  }
1378  cbp += cbp;
1379  }
1380  }
1381 
1382  /* per-MB end of slice check */
1383  if (--s->mb_num_left <= 0) {
1384  if (mpeg4_is_resync(ctx))
1385  return SLICE_END;
1386  else
1387  return SLICE_NOEND;
1388  } else {
1389  if (mpeg4_is_resync(ctx)) {
1390  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1391  if (s->cbp_table[xy + delta])
1392  return SLICE_END;
1393  }
1394  return SLICE_OK;
1395  }
1396 }
1397 
1398 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1399 {
1400  Mpeg4DecContext *ctx = s->avctx->priv_data;
1401  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1402  int16_t *mot_val;
1403  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1404  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1405 
1406  av_assert2(s == (void*)ctx);
1407  av_assert2(s->h263_pred);
1408 
1409  if (s->pict_type == AV_PICTURE_TYPE_P ||
1410  s->pict_type == AV_PICTURE_TYPE_S) {
1411  do {
1412  if (get_bits1(&s->gb)) {
1413  /* skip mb */
1414  s->mb_intra = 0;
1415  for (i = 0; i < 6; i++)
1416  s->block_last_index[i] = -1;
1417  s->mv_dir = MV_DIR_FORWARD;
1418  s->mv_type = MV_TYPE_16X16;
1419  if (s->pict_type == AV_PICTURE_TYPE_S &&
1420  ctx->vol_sprite_usage == GMC_SPRITE) {
1421  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1422  MB_TYPE_GMC |
1423  MB_TYPE_16x16 |
1424  MB_TYPE_L0;
1425  s->mcsel = 1;
1426  s->mv[0][0][0] = get_amv(ctx, 0);
1427  s->mv[0][0][1] = get_amv(ctx, 1);
1428  s->mb_skipped = 0;
1429  } else {
1430  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1431  MB_TYPE_16x16 |
1432  MB_TYPE_L0;
1433  s->mcsel = 0;
1434  s->mv[0][0][0] = 0;
1435  s->mv[0][0][1] = 0;
1436  s->mb_skipped = 1;
1437  }
1438  goto end;
1439  }
1441  if (cbpc < 0) {
1442  av_log(s->avctx, AV_LOG_ERROR,
1443  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1444  return AVERROR_INVALIDDATA;
1445  }
1446  } while (cbpc == 20);
1447 
1448  s->bdsp.clear_blocks(s->block[0]);
1449  dquant = cbpc & 8;
1450  s->mb_intra = ((cbpc & 4) != 0);
1451  if (s->mb_intra)
1452  goto intra;
1453 
1454  if (s->pict_type == AV_PICTURE_TYPE_S &&
1455  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1456  s->mcsel = get_bits1(&s->gb);
1457  else
1458  s->mcsel = 0;
1459  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1460  if (cbpy < 0) {
1461  av_log(s->avctx, AV_LOG_ERROR,
1462  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1463  return AVERROR_INVALIDDATA;
1464  }
1465 
1466  cbp = (cbpc & 3) | (cbpy << 2);
1467  if (dquant)
1468  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1469  if ((!s->progressive_sequence) &&
1470  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1471  s->interlaced_dct = get_bits1(&s->gb);
1472 
1473  s->mv_dir = MV_DIR_FORWARD;
1474  if ((cbpc & 16) == 0) {
1475  if (s->mcsel) {
1476  s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1477  MB_TYPE_16x16 |
1478  MB_TYPE_L0;
1479  /* 16x16 global motion prediction */
1480  s->mv_type = MV_TYPE_16X16;
1481  mx = get_amv(ctx, 0);
1482  my = get_amv(ctx, 1);
1483  s->mv[0][0][0] = mx;
1484  s->mv[0][0][1] = my;
1485  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1486  s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1487  MB_TYPE_L0 |
1489  /* 16x8 field motion prediction */
1490  s->mv_type = MV_TYPE_FIELD;
1491 
1492  s->field_select[0][0] = get_bits1(&s->gb);
1493  s->field_select[0][1] = get_bits1(&s->gb);
1494 
1495  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1496 
1497  for (i = 0; i < 2; i++) {
1498  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1499  if (mx >= 0xffff)
1500  return AVERROR_INVALIDDATA;
1501 
1502  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1503  if (my >= 0xffff)
1504  return AVERROR_INVALIDDATA;
1505 
1506  s->mv[0][i][0] = mx;
1507  s->mv[0][i][1] = my;
1508  }
1509  } else {
1510  s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1511  /* 16x16 motion prediction */
1512  s->mv_type = MV_TYPE_16X16;
1513  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1514  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1515 
1516  if (mx >= 0xffff)
1517  return AVERROR_INVALIDDATA;
1518 
1519  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1520 
1521  if (my >= 0xffff)
1522  return AVERROR_INVALIDDATA;
1523  s->mv[0][0][0] = mx;
1524  s->mv[0][0][1] = my;
1525  }
1526  } else {
1527  s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1528  s->mv_type = MV_TYPE_8X8;
1529  for (i = 0; i < 4; i++) {
1530  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1531  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1532  if (mx >= 0xffff)
1533  return AVERROR_INVALIDDATA;
1534 
1535  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1536  if (my >= 0xffff)
1537  return AVERROR_INVALIDDATA;
1538  s->mv[0][i][0] = mx;
1539  s->mv[0][i][1] = my;
1540  mot_val[0] = mx;
1541  mot_val[1] = my;
1542  }
1543  }
1544  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1545  int modb1; // first bit of modb
1546  int modb2; // second bit of modb
1547  int mb_type;
1548 
1549  s->mb_intra = 0; // B-frames never contain intra blocks
1550  s->mcsel = 0; // ... true gmc blocks
1551 
1552  if (s->mb_x == 0) {
1553  for (i = 0; i < 2; i++) {
1554  s->last_mv[i][0][0] =
1555  s->last_mv[i][0][1] =
1556  s->last_mv[i][1][0] =
1557  s->last_mv[i][1][1] = 0;
1558  }
1559 
1560  ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1561  }
1562 
1563  /* if we skipped it in the future P-frame than skip it now too */
1564  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1565 
1566  if (s->mb_skipped) {
1567  /* skip mb */
1568  for (i = 0; i < 6; i++)
1569  s->block_last_index[i] = -1;
1570 
1571  s->mv_dir = MV_DIR_FORWARD;
1572  s->mv_type = MV_TYPE_16X16;
1573  s->mv[0][0][0] =
1574  s->mv[0][0][1] =
1575  s->mv[1][0][0] =
1576  s->mv[1][0][1] = 0;
1577  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1578  MB_TYPE_16x16 |
1579  MB_TYPE_L0;
1580  goto end;
1581  }
1582 
1583  modb1 = get_bits1(&s->gb);
1584  if (modb1) {
1585  // like MB_TYPE_B_DIRECT but no vectors coded
1587  cbp = 0;
1588  } else {
1589  modb2 = get_bits1(&s->gb);
1590  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1591  if (mb_type < 0) {
1592  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1593  return AVERROR_INVALIDDATA;
1594  }
1595  mb_type = mb_type_b_map[mb_type];
1596  if (modb2) {
1597  cbp = 0;
1598  } else {
1599  s->bdsp.clear_blocks(s->block[0]);
1600  cbp = get_bits(&s->gb, 6);
1601  }
1602 
1603  if ((!IS_DIRECT(mb_type)) && cbp) {
1604  if (get_bits1(&s->gb))
1605  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1606  }
1607 
1608  if (!s->progressive_sequence) {
1609  if (cbp)
1610  s->interlaced_dct = get_bits1(&s->gb);
1611 
1612  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1613  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1614  mb_type &= ~MB_TYPE_16x16;
1615 
1616  if (USES_LIST(mb_type, 0)) {
1617  s->field_select[0][0] = get_bits1(&s->gb);
1618  s->field_select[0][1] = get_bits1(&s->gb);
1619  }
1620  if (USES_LIST(mb_type, 1)) {
1621  s->field_select[1][0] = get_bits1(&s->gb);
1622  s->field_select[1][1] = get_bits1(&s->gb);
1623  }
1624  }
1625  }
1626 
1627  s->mv_dir = 0;
1628  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1629  s->mv_type = MV_TYPE_16X16;
1630 
1631  if (USES_LIST(mb_type, 0)) {
1632  s->mv_dir = MV_DIR_FORWARD;
1633 
1634  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1635  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1636  s->last_mv[0][1][0] =
1637  s->last_mv[0][0][0] =
1638  s->mv[0][0][0] = mx;
1639  s->last_mv[0][1][1] =
1640  s->last_mv[0][0][1] =
1641  s->mv[0][0][1] = my;
1642  }
1643 
1644  if (USES_LIST(mb_type, 1)) {
1645  s->mv_dir |= MV_DIR_BACKWARD;
1646 
1647  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1648  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1649  s->last_mv[1][1][0] =
1650  s->last_mv[1][0][0] =
1651  s->mv[1][0][0] = mx;
1652  s->last_mv[1][1][1] =
1653  s->last_mv[1][0][1] =
1654  s->mv[1][0][1] = my;
1655  }
1656  } else if (!IS_DIRECT(mb_type)) {
1657  s->mv_type = MV_TYPE_FIELD;
1658 
1659  if (USES_LIST(mb_type, 0)) {
1660  s->mv_dir = MV_DIR_FORWARD;
1661 
1662  for (i = 0; i < 2; i++) {
1663  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1664  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1665  s->last_mv[0][i][0] =
1666  s->mv[0][i][0] = mx;
1667  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1668  }
1669  }
1670 
1671  if (USES_LIST(mb_type, 1)) {
1672  s->mv_dir |= MV_DIR_BACKWARD;
1673 
1674  for (i = 0; i < 2; i++) {
1675  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1676  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1677  s->last_mv[1][i][0] =
1678  s->mv[1][i][0] = mx;
1679  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1680  }
1681  }
1682  }
1683  }
1684 
1685  if (IS_DIRECT(mb_type)) {
1686  if (IS_SKIP(mb_type)) {
1687  mx =
1688  my = 0;
1689  } else {
1690  mx = ff_h263_decode_motion(s, 0, 1);
1691  my = ff_h263_decode_motion(s, 0, 1);
1692  }
1693 
1694  s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1695  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1696  }
1697  s->current_picture.mb_type[xy] = mb_type;
1698  } else { /* I-Frame */
1699  do {
1701  if (cbpc < 0) {
1702  av_log(s->avctx, AV_LOG_ERROR,
1703  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1704  return AVERROR_INVALIDDATA;
1705  }
1706  } while (cbpc == 8);
1707 
1708  dquant = cbpc & 4;
1709  s->mb_intra = 1;
1710 
1711 intra:
1712  s->ac_pred = get_bits1(&s->gb);
1713  if (s->ac_pred)
1714  s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1715  else
1716  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1717 
1718  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1719  if (cbpy < 0) {
1720  av_log(s->avctx, AV_LOG_ERROR,
1721  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1722  return AVERROR_INVALIDDATA;
1723  }
1724  cbp = (cbpc & 3) | (cbpy << 2);
1725 
1726  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1727 
1728  if (dquant)
1729  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1730 
1731  if (!s->progressive_sequence)
1732  s->interlaced_dct = get_bits1(&s->gb);
1733 
1734  s->bdsp.clear_blocks(s->block[0]);
1735  /* decode each block */
1736  for (i = 0; i < 6; i++) {
1737  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1738  return AVERROR_INVALIDDATA;
1739  cbp += cbp;
1740  }
1741  goto end;
1742  }
1743 
1744  /* decode each block */
1745  for (i = 0; i < 6; i++) {
1746  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1747  return AVERROR_INVALIDDATA;
1748  cbp += cbp;
1749  }
1750 
1751 end:
1752  /* per-MB end of slice check */
1753  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1754  int next = mpeg4_is_resync(ctx);
1755  if (next) {
1756  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1757  return AVERROR_INVALIDDATA;
1758  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1759  return SLICE_END;
1760 
1761  if (s->pict_type == AV_PICTURE_TYPE_B) {
1762  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1763  ff_thread_await_progress(&s->next_picture_ptr->tf,
1764  (s->mb_x + delta >= s->mb_width)
1765  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1766  : s->mb_y, 0);
1767  if (s->next_picture.mbskip_table[xy + delta])
1768  return SLICE_OK;
1769  }
1770 
1771  return SLICE_END;
1772  }
1773  }
1774 
1775  return SLICE_OK;
1776 }
1777 
1778 /* As per spec, studio start code search isn't the same as the old type of start code */
1780 {
1781  align_get_bits(gb);
1782 
1783  while (get_bits_left(gb) >= 24 && show_bits(gb, 24) != 0x1) {
1784  get_bits(gb, 8);
1785  }
1786 }
1787 
1788 /* additional_code, vlc index */
1789 static const uint8_t ac_state_tab[22][2] =
1790 {
1791  {0, 0},
1792  {0, 1},
1793  {1, 1},
1794  {2, 1},
1795  {3, 1},
1796  {4, 1},
1797  {5, 1},
1798  {1, 2},
1799  {2, 2},
1800  {3, 2},
1801  {4, 2},
1802  {5, 2},
1803  {6, 2},
1804  {1, 3},
1805  {2, 4},
1806  {3, 5},
1807  {4, 6},
1808  {5, 7},
1809  {6, 8},
1810  {7, 9},
1811  {8, 10},
1812  {0, 11}
1813 };
1814 
1816 {
1817  Mpeg4DecContext *ctx = s->avctx->priv_data;
1818 
1819  int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
1820  additional_code_len, sign, mismatch;
1821  const VLC *cur_vlc = &studio_intra_tab[0];
1822  uint8_t *const scantable = s->intra_scantable.permutated;
1823  const uint16_t *quant_matrix;
1824  uint32_t flc;
1825  const int min = -1 * (1 << (s->avctx->bits_per_raw_sample + 6));
1826  const int max = ((1 << (s->avctx->bits_per_raw_sample + 6)) - 1);
1827  int shift = 3 - s->dct_precision;
1828 
1829  mismatch = 1;
1830 
1831  memset(block, 0, 64 * sizeof(int32_t));
1832 
1833  if (n < 4) {
1834  cc = 0;
1835  dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1836  quant_matrix = s->intra_matrix;
1837  } else {
1838  cc = (n & 1) + 1;
1839  if (ctx->rgb)
1840  dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1841  else
1842  dct_dc_size = get_vlc2(&s->gb, studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
1843  quant_matrix = s->chroma_intra_matrix;
1844  }
1845 
1846  if (dct_dc_size == 0) {
1847  dct_diff = 0;
1848  } else {
1849  dct_diff = get_xbits(&s->gb, dct_dc_size);
1850 
1851  if (dct_dc_size > 8) {
1852  if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
1853  return AVERROR_INVALIDDATA;
1854  }
1855 
1856  }
1857 
1858  s->last_dc[cc] += dct_diff;
1859 
1860  if (s->mpeg_quant)
1861  block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
1862  else
1863  block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
1864  /* TODO: support mpeg_quant for AC coefficients */
1865 
1866  block[0] = av_clip(block[0], min, max);
1867  mismatch ^= block[0];
1868 
1869  /* AC Coefficients */
1870  while (1) {
1871  group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);
1872 
1873  if (group < 0) {
1874  av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
1875  return AVERROR_INVALIDDATA;
1876  }
1877 
1878  additional_code_len = ac_state_tab[group][0];
1879  cur_vlc = &studio_intra_tab[ac_state_tab[group][1]];
1880 
1881  if (group == 0) {
1882  /* End of Block */
1883  break;
1884  } else if (group >= 1 && group <= 6) {
1885  /* Zero run length (Table B.47) */
1886  run = 1 << additional_code_len;
1887  if (additional_code_len)
1888  run += get_bits(&s->gb, additional_code_len);
1889  idx += run;
1890  continue;
1891  } else if (group >= 7 && group <= 12) {
1892  /* Zero run length and +/-1 level (Table B.48) */
1893  code = get_bits(&s->gb, additional_code_len);
1894  sign = code & 1;
1895  code >>= 1;
1896  run = (1 << (additional_code_len - 1)) + code;
1897  idx += run;
1898  if (idx > 63)
1899  return AVERROR_INVALIDDATA;
1900  j = scantable[idx++];
1901  block[j] = sign ? 1 : -1;
1902  } else if (group >= 13 && group <= 20) {
1903  /* Level value (Table B.49) */
1904  if (idx > 63)
1905  return AVERROR_INVALIDDATA;
1906  j = scantable[idx++];
1907  block[j] = get_xbits(&s->gb, additional_code_len);
1908  } else if (group == 21) {
1909  /* Escape */
1910  if (idx > 63)
1911  return AVERROR_INVALIDDATA;
1912  j = scantable[idx++];
1913  additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
1914  flc = get_bits(&s->gb, additional_code_len);
1915  if (flc >> (additional_code_len-1))
1916  block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
1917  else
1918  block[j] = flc;
1919  }
1920  block[j] = ((block[j] * quant_matrix[j] * s->qscale) * (1 << shift)) / 16;
1921  block[j] = av_clip(block[j], min, max);
1922  mismatch ^= block[j];
1923  }
1924 
1925  block[63] ^= mismatch & 1;
1926 
1927  return 0;
1928 }
1929 
1930 static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
1931 {
1932  int i, j, w, h, idx = 0;
1933  int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
1934  dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
1935  h = 16 >> (n ? s->chroma_y_shift : 0);
1936  w = 16 >> (n ? s->chroma_x_shift : 0);
1937 
1938  block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1939  if (block_mean == 0){
1940  av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
1941  return AVERROR_INVALIDDATA;
1942  }
1943  s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));
1944 
1945  rice_parameter = get_bits(&s->gb, 4);
1946  if (rice_parameter == 0) {
1947  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1948  return AVERROR_INVALIDDATA;
1949  }
1950 
1951  if (rice_parameter == 15)
1952  rice_parameter = 0;
1953 
1954  if (rice_parameter > 11) {
1955  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1956  return AVERROR_INVALIDDATA;
1957  }
1958 
1959  for (i = 0; i < h; i++) {
1960  output = 1 << (s->avctx->bits_per_raw_sample - 1);
1961  top = 1 << (s->avctx->bits_per_raw_sample - 1);
1962 
1963  for (j = 0; j < w; j++) {
1964  left = output;
1965  topleft = top;
1966 
1967  rice_prefix_code = get_unary(&s->gb, 1, 12);
1968 
1969  /* Escape */
1970  if (rice_prefix_code == 11)
1971  dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1972  else {
1973  if (rice_prefix_code == 12) {
1974  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
1975  return AVERROR_INVALIDDATA;
1976  }
1977  rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
1978  dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
1979  }
1980 
1981  /* Map to a signed residual */
1982  if (dpcm_residual & 1)
1983  dpcm_residual = (-1 * dpcm_residual) >> 1;
1984  else
1985  dpcm_residual = (dpcm_residual >> 1);
1986 
1987  if (i != 0)
1988  top = macroblock[idx-w];
1989 
1990  p = left + top - topleft;
1991  min_left_top = FFMIN(left, top);
1992  if (p < min_left_top)
1993  p = min_left_top;
1994 
1995  max_left_top = FFMAX(left, top);
1996  if (p > max_left_top)
1997  p = max_left_top;
1998 
1999  p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
2000  if (p2 == p)
2001  p2 = block_mean;
2002 
2003  if (p2 > p)
2004  dpcm_residual *= -1;
2005 
2006  macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
2007  }
2008  }
2009 
2010  return 0;
2011 }
2012 
2013 static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
2014 {
2015  int i;
2016 
2017  s->dpcm_direction = 0;
2018 
2019  /* StudioMacroblock */
2020  /* Assumes I-VOP */
2021  s->mb_intra = 1;
2022  if (get_bits1(&s->gb)) { /* compression_mode */
2023  /* DCT */
2024  /* macroblock_type, 1 or 2-bit VLC */
2025  if (!get_bits1(&s->gb)) {
2026  skip_bits1(&s->gb);
2027  s->qscale = mpeg_get_qscale(s);
2028  }
2029 
2030  for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
2031  if (mpeg4_decode_studio_block(s, (*s->block32)[i], i) < 0)
2032  return AVERROR_INVALIDDATA;
2033  }
2034  } else {
2035  /* DPCM */
2036  check_marker(s->avctx, &s->gb, "DPCM block start");
2037  s->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
2038  for (i = 0; i < 3; i++) {
2039  if (mpeg4_decode_dpcm_macroblock(s, (*s->dpcm_macroblock)[i], i) < 0)
2040  return AVERROR_INVALIDDATA;
2041  }
2042  }
2043 
2044  if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
2045  next_start_code_studio(&s->gb);
2046  return SLICE_END;
2047  }
2048 
2049  //vcon-stp9L1.bits (first frame)
2050  if (get_bits_left(&s->gb) == 0)
2051  return SLICE_END;
2052 
2053  //vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
2054  if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
2055  return SLICE_END;
2056 
2057  return SLICE_OK;
2058 }
2059 
2061 {
2062  int hours, minutes, seconds;
2063 
2064  if (!show_bits(gb, 23)) {
2065  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
2066  return AVERROR_INVALIDDATA;
2067  }
2068 
2069  hours = get_bits(gb, 5);
2070  minutes = get_bits(gb, 6);
2071  check_marker(s->avctx, gb, "in gop_header");
2072  seconds = get_bits(gb, 6);
2073 
2074  s->time_base = seconds + 60*(minutes + 60*hours);
2075 
2076  skip_bits1(gb);
2077  skip_bits1(gb);
2078 
2079  return 0;
2080 }
2081 
2083 {
2084 
2085  *profile = get_bits(gb, 4);
2086  *level = get_bits(gb, 4);
2087 
2088  // for Simple profile, level 0
2089  if (*profile == 0 && *level == 8) {
2090  *level = 0;
2091  }
2092 
2093  return 0;
2094 }
2095 
2097 {
2098  int visual_object_type;
2099  int is_visual_object_identifier = get_bits1(gb);
2100 
2101  if (is_visual_object_identifier) {
2102  skip_bits(gb, 4+3);
2103  }
2104  visual_object_type = get_bits(gb, 4);
2105 
2106  if (visual_object_type == VOT_VIDEO_ID ||
2107  visual_object_type == VOT_STILL_TEXTURE_ID) {
2108  int video_signal_type = get_bits1(gb);
2109  if (video_signal_type) {
2110  int video_range, color_description;
2111  skip_bits(gb, 3); // video_format
2112  video_range = get_bits1(gb);
2113  color_description = get_bits1(gb);
2114 
2115  s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
2116 
2117  if (color_description) {
2118  s->avctx->color_primaries = get_bits(gb, 8);
2119  s->avctx->color_trc = get_bits(gb, 8);
2120  s->avctx->colorspace = get_bits(gb, 8);
2121  }
2122  }
2123  }
2124 
2125  return 0;
2126 }
2127 
2129 {
2130  int i, v;
2131 
2132  /* load default matrices */
2133  for (i = 0; i < 64; i++) {
2134  int j = s->idsp.idct_permutation[i];
2136  s->intra_matrix[j] = v;
2137  s->chroma_intra_matrix[j] = v;
2138 
2140  s->inter_matrix[j] = v;
2141  s->chroma_inter_matrix[j] = v;
2142  }
2143 }
2144 
2146 {
2147  int i, j, v;
2148 
2149  if (get_bits1(gb)) {
2150  if (get_bits_left(gb) < 64*8)
2151  return AVERROR_INVALIDDATA;
2152  /* intra_quantiser_matrix */
2153  for (i = 0; i < 64; i++) {
2154  v = get_bits(gb, 8);
2155  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2156  s->intra_matrix[j] = v;
2157  s->chroma_intra_matrix[j] = v;
2158  }
2159  }
2160 
2161  if (get_bits1(gb)) {
2162  if (get_bits_left(gb) < 64*8)
2163  return AVERROR_INVALIDDATA;
2164  /* non_intra_quantiser_matrix */
2165  for (i = 0; i < 64; i++) {
2166  get_bits(gb, 8);
2167  }
2168  }
2169 
2170  if (get_bits1(gb)) {
2171  if (get_bits_left(gb) < 64*8)
2172  return AVERROR_INVALIDDATA;
2173  /* chroma_intra_quantiser_matrix */
2174  for (i = 0; i < 64; i++) {
2175  v = get_bits(gb, 8);
2176  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2177  s->chroma_intra_matrix[j] = v;
2178  }
2179  }
2180 
2181  if (get_bits1(gb)) {
2182  if (get_bits_left(gb) < 64*8)
2183  return AVERROR_INVALIDDATA;
2184  /* chroma_non_intra_quantiser_matrix */
2185  for (i = 0; i < 64; i++) {
2186  get_bits(gb, 8);
2187  }
2188  }
2189 
2191  return 0;
2192 }
2193 
2195 {
2196  uint32_t startcode;
2197  uint8_t extension_type;
2198 
2199  startcode = show_bits_long(gb, 32);
2200  if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {
2201 
2202  if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
2203  skip_bits_long(gb, 32);
2204  extension_type = get_bits(gb, 4);
2205  if (extension_type == QUANT_MATRIX_EXT_ID)
2206  read_quant_matrix_ext(s, gb);
2207  }
2208  }
2209 }
2210 
2212 {
2213  MpegEncContext *s = &ctx->m;
2214  int width, height;
2215  int bits_per_raw_sample;
2216  int rgb, chroma_format;
2217 
2218  // random_accessible_vol and video_object_type_indication have already
2219  // been read by the caller decode_vol_header()
2220  skip_bits(gb, 4); /* video_object_layer_verid */
2221  ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
2222  skip_bits(gb, 4); /* video_object_layer_shape_extension */
2223  skip_bits1(gb); /* progressive_sequence */
2224  if (ctx->shape != RECT_SHAPE) {
2225  avpriv_request_sample(s->avctx, "MPEG-4 Studio profile non rectangular shape");
2226  return AVERROR_PATCHWELCOME;
2227  }
2228  if (ctx->shape != BIN_ONLY_SHAPE) {
2229  rgb = get_bits1(gb); /* rgb_components */
2230  chroma_format = get_bits(gb, 2); /* chroma_format */
2231  if (!chroma_format || chroma_format == CHROMA_420 || (rgb && chroma_format == CHROMA_422)) {
2232  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2233  return AVERROR_INVALIDDATA;
2234  }
2235 
2236  bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
2237  if (bits_per_raw_sample == 10) {
2238  if (rgb) {
2239  s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
2240  } else {
2241  s->avctx->pix_fmt = chroma_format == CHROMA_422 ? AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV444P10;
2242  }
2243  } else {
2244  avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
2245  return AVERROR_PATCHWELCOME;
2246  }
2247  if (rgb != ctx->rgb || s->chroma_format != chroma_format)
2248  s->context_reinit = 1;
2249  s->avctx->bits_per_raw_sample = bits_per_raw_sample;
2250  ctx->rgb = rgb;
2251  s->chroma_format = chroma_format;
2252  }
2253  if (ctx->shape == RECT_SHAPE) {
2254  check_marker(s->avctx, gb, "before video_object_layer_width");
2255  width = get_bits(gb, 14); /* video_object_layer_width */
2256  check_marker(s->avctx, gb, "before video_object_layer_height");
2257  height = get_bits(gb, 14); /* video_object_layer_height */
2258  check_marker(s->avctx, gb, "after video_object_layer_height");
2259 
2260  /* Do the same check as non-studio profile */
2261  if (width && height) {
2262  if (s->width && s->height &&
2263  (s->width != width || s->height != height))
2264  s->context_reinit = 1;
2265  s->width = width;
2266  s->height = height;
2267  }
2268  }
2269  s->aspect_ratio_info = get_bits(gb, 4);
2270  if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
2271  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2272  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2273  } else {
2274  s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2275  }
2276  skip_bits(gb, 4); /* frame_rate_code */
2277  skip_bits(gb, 15); /* first_half_bit_rate */
2278  check_marker(s->avctx, gb, "after first_half_bit_rate");
2279  skip_bits(gb, 15); /* latter_half_bit_rate */
2280  check_marker(s->avctx, gb, "after latter_half_bit_rate");
2281  skip_bits(gb, 15); /* first_half_vbv_buffer_size */
2282  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2283  skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
2284  skip_bits(gb, 11); /* first_half_vbv_buffer_size */
2285  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2286  skip_bits(gb, 15); /* latter_half_vbv_occupancy */
2287  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2288  s->low_delay = get_bits1(gb);
2289  s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */
2290 
2292  extension_and_user_data(s, gb, 2);
2293 
2294  return 0;
2295 }
2296 
2298 {
2299  MpegEncContext *s = &ctx->m;
2300  int width, height, vo_ver_id;
2301 
2302  /* vol header */
2303  skip_bits(gb, 1); /* random access */
2304  s->vo_type = get_bits(gb, 8);
2305 
2306  /* If we are in studio profile (per vo_type), check if its all consistent
2307  * and if so continue pass control to decode_studio_vol_header().
2308  * elIf something is inconsistent, error out
2309  * else continue with (non studio) vol header decpoding.
2310  */
2311  if (s->vo_type == CORE_STUDIO_VO_TYPE ||
2312  s->vo_type == SIMPLE_STUDIO_VO_TYPE) {
2313  if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
2314  return AVERROR_INVALIDDATA;
2315  s->studio_profile = 1;
2316  s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
2317  return decode_studio_vol_header(ctx, gb);
2318  } else if (s->studio_profile) {
2319  return AVERROR_PATCHWELCOME;
2320  }
2321 
2322  if (get_bits1(gb) != 0) { /* is_ol_id */
2323  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
2324  skip_bits(gb, 3); /* vo_priority */
2325  } else {
2326  vo_ver_id = 1;
2327  }
2328  s->aspect_ratio_info = get_bits(gb, 4);
2329  if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
2330  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2331  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2332  } else {
2333  s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2334  }
2335 
2336  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
2337  int chroma_format = get_bits(gb, 2);
2338  if (chroma_format != CHROMA_420)
2339  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2340 
2341  s->low_delay = get_bits1(gb);
2342  if (get_bits1(gb)) { /* vbv parameters */
2343  get_bits(gb, 15); /* first_half_bitrate */
2344  check_marker(s->avctx, gb, "after first_half_bitrate");
2345  get_bits(gb, 15); /* latter_half_bitrate */
2346  check_marker(s->avctx, gb, "after latter_half_bitrate");
2347  get_bits(gb, 15); /* first_half_vbv_buffer_size */
2348  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2349  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
2350  get_bits(gb, 11); /* first_half_vbv_occupancy */
2351  check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
2352  get_bits(gb, 15); /* latter_half_vbv_occupancy */
2353  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2354  }
2355  } else {
2356  /* is setting low delay flag only once the smartest thing to do?
2357  * low delay detection will not be overridden. */
2358  if (s->picture_number == 0) {
2359  switch(s->vo_type) {
2360  case SIMPLE_VO_TYPE:
2361  case ADV_SIMPLE_VO_TYPE:
2362  s->low_delay = 1;
2363  break;
2364  default:
2365  s->low_delay = 0;
2366  }
2367  }
2368  }
2369 
2370  ctx->shape = get_bits(gb, 2); /* vol shape */
2371  if (ctx->shape != RECT_SHAPE)
2372  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
2373  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
2374  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
2375  skip_bits(gb, 4); /* video_object_layer_shape_extension */
2376  }
2377 
2378  check_marker(s->avctx, gb, "before time_increment_resolution");
2379 
2380  s->avctx->framerate.num = get_bits(gb, 16);
2381  if (!s->avctx->framerate.num) {
2382  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
2383  return AVERROR_INVALIDDATA;
2384  }
2385 
2386  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
2387  if (ctx->time_increment_bits < 1)
2388  ctx->time_increment_bits = 1;
2389 
2390  check_marker(s->avctx, gb, "before fixed_vop_rate");
2391 
2392  if (get_bits1(gb) != 0) /* fixed_vop_rate */
2393  s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
2394  else
2395  s->avctx->framerate.den = 1;
2396 
2397  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2398 
2399  ctx->t_frame = 0;
2400 
2401  if (ctx->shape != BIN_ONLY_SHAPE) {
2402  if (ctx->shape == RECT_SHAPE) {
2403  check_marker(s->avctx, gb, "before width");
2404  width = get_bits(gb, 13);
2405  check_marker(s->avctx, gb, "before height");
2406  height = get_bits(gb, 13);
2407  check_marker(s->avctx, gb, "after height");
2408  if (width && height && /* they should be non zero but who knows */
2409  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
2410  if (s->width && s->height &&
2411  (s->width != width || s->height != height))
2412  s->context_reinit = 1;
2413  s->width = width;
2414  s->height = height;
2415  }
2416  }
2417 
2418  s->progressive_sequence =
2419  s->progressive_frame = get_bits1(gb) ^ 1;
2420  s->interlaced_dct = 0;
2421  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
2422  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
2423  "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
2424  if (vo_ver_id == 1)
2425  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
2426  else
2427  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
2428 
2429  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2430  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
2431  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
2432  ctx->vol_sprite_usage == GMC_SPRITE) {
2433  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
2434  skip_bits(gb, 13); // sprite_width
2435  check_marker(s->avctx, gb, "after sprite_width");
2436  skip_bits(gb, 13); // sprite_height
2437  check_marker(s->avctx, gb, "after sprite_height");
2438  skip_bits(gb, 13); // sprite_left
2439  check_marker(s->avctx, gb, "after sprite_left");
2440  skip_bits(gb, 13); // sprite_top
2441  check_marker(s->avctx, gb, "after sprite_top");
2442  }
2443  ctx->num_sprite_warping_points = get_bits(gb, 6);
2444  if (ctx->num_sprite_warping_points > 3) {
2445  av_log(s->avctx, AV_LOG_ERROR,
2446  "%d sprite_warping_points\n",
2447  ctx->num_sprite_warping_points);
2448  ctx->num_sprite_warping_points = 0;
2449  return AVERROR_INVALIDDATA;
2450  }
2451  s->sprite_warping_accuracy = get_bits(gb, 2);
2452  ctx->sprite_brightness_change = get_bits1(gb);
2453  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2454  skip_bits1(gb); // low_latency_sprite
2455  }
2456  // FIXME sadct disable bit if verid!=1 && shape not rect
2457 
2458  if (get_bits1(gb) == 1) { /* not_8_bit */
2459  s->quant_precision = get_bits(gb, 4); /* quant_precision */
2460  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
2461  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
2462  if (s->quant_precision != 5)
2463  av_log(s->avctx, AV_LOG_ERROR,
2464  "quant precision %d\n", s->quant_precision);
2465  if (s->quant_precision<3 || s->quant_precision>9) {
2466  s->quant_precision = 5;
2467  }
2468  } else {
2469  s->quant_precision = 5;
2470  }
2471 
2472  // FIXME a bunch of grayscale shape things
2473 
2474  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
2475  int i, v;
2476 
2478 
2479  /* load custom intra matrix */
2480  if (get_bits1(gb)) {
2481  int last = 0;
2482  for (i = 0; i < 64; i++) {
2483  int j;
2484  if (get_bits_left(gb) < 8) {
2485  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2486  return AVERROR_INVALIDDATA;
2487  }
2488  v = get_bits(gb, 8);
2489  if (v == 0)
2490  break;
2491 
2492  last = v;
2493  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2494  s->intra_matrix[j] = last;
2495  s->chroma_intra_matrix[j] = last;
2496  }
2497 
2498  /* replicate last value */
2499  for (; i < 64; i++) {
2500  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2501  s->intra_matrix[j] = last;
2502  s->chroma_intra_matrix[j] = last;
2503  }
2504  }
2505 
2506  /* load custom non intra matrix */
2507  if (get_bits1(gb)) {
2508  int last = 0;
2509  for (i = 0; i < 64; i++) {
2510  int j;
2511  if (get_bits_left(gb) < 8) {
2512  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2513  return AVERROR_INVALIDDATA;
2514  }
2515  v = get_bits(gb, 8);
2516  if (v == 0)
2517  break;
2518 
2519  last = v;
2520  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2521  s->inter_matrix[j] = v;
2522  s->chroma_inter_matrix[j] = v;
2523  }
2524 
2525  /* replicate last value */
2526  for (; i < 64; i++) {
2527  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2528  s->inter_matrix[j] = last;
2529  s->chroma_inter_matrix[j] = last;
2530  }
2531  }
2532 
2533  // FIXME a bunch of grayscale shape things
2534  }
2535 
2536  if (vo_ver_id != 1)
2537  s->quarter_sample = get_bits1(gb);
2538  else
2539  s->quarter_sample = 0;
2540 
2541  if (get_bits_left(gb) < 4) {
2542  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
2543  return AVERROR_INVALIDDATA;
2544  }
2545 
2546  if (!get_bits1(gb)) {
2547  int pos = get_bits_count(gb);
2548  int estimation_method = get_bits(gb, 2);
2549  if (estimation_method < 2) {
2550  if (!get_bits1(gb)) {
2551  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2552  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2553  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2554  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2555  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2556  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2557  }
2558  if (!get_bits1(gb)) {
2559  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2560  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2561  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2562  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2563  }
2564  if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2565  skip_bits_long(gb, pos - get_bits_count(gb));
2566  goto no_cplx_est;
2567  }
2568  if (!get_bits1(gb)) {
2569  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2570  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2571  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2572  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2573  }
2574  if (!get_bits1(gb)) {
2575  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2576  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2577  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2578  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2579  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2580  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2581  }
2582  if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2583  skip_bits_long(gb, pos - get_bits_count(gb));
2584  goto no_cplx_est;
2585  }
2586  if (estimation_method == 1) {
2587  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2588  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2589  }
2590  } else
2591  av_log(s->avctx, AV_LOG_ERROR,
2592  "Invalid Complexity estimation method %d\n",
2593  estimation_method);
2594  } else {
2595 
2596 no_cplx_est:
2597  ctx->cplx_estimation_trash_i =
2598  ctx->cplx_estimation_trash_p =
2599  ctx->cplx_estimation_trash_b = 0;
2600  }
2601 
2602  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2603 
2604  s->data_partitioning = get_bits1(gb);
2605  if (s->data_partitioning)
2606  ctx->rvlc = get_bits1(gb);
2607 
2608  if (vo_ver_id != 1) {
2609  ctx->new_pred = get_bits1(gb);
2610  if (ctx->new_pred) {
2611  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2612  skip_bits(gb, 2); /* requested upstream message type */
2613  skip_bits1(gb); /* newpred segment type */
2614  }
2615  if (get_bits1(gb)) // reduced_res_vop
2616  av_log(s->avctx, AV_LOG_ERROR,
2617  "reduced resolution VOP not supported\n");
2618  } else {
2619  ctx->new_pred = 0;
2620  }
2621 
2622  ctx->scalability = get_bits1(gb);
2623 
2624  if (ctx->scalability) {
2625  GetBitContext bak = *gb;
2626  int h_sampling_factor_n;
2627  int h_sampling_factor_m;
2628  int v_sampling_factor_n;
2629  int v_sampling_factor_m;
2630 
2631  skip_bits1(gb); // hierarchy_type
2632  skip_bits(gb, 4); /* ref_layer_id */
2633  skip_bits1(gb); /* ref_layer_sampling_dir */
2634  h_sampling_factor_n = get_bits(gb, 5);
2635  h_sampling_factor_m = get_bits(gb, 5);
2636  v_sampling_factor_n = get_bits(gb, 5);
2637  v_sampling_factor_m = get_bits(gb, 5);
2638  ctx->enhancement_type = get_bits1(gb);
2639 
2640  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2641  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2642  /* illegal scalability header (VERY broken encoder),
2643  * trying to workaround */
2644  ctx->scalability = 0;
2645  *gb = bak;
2646  } else
2647  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2648 
2649  // bin shape stuff FIXME
2650  }
2651  }
2652 
2653  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2654  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",
2655  s->avctx->framerate.den, s->avctx->framerate.num,
2656  ctx->time_increment_bits,
2657  s->quant_precision,
2658  s->progressive_sequence,
2659  s->low_delay,
2660  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2661  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2662  );
2663  }
2664 
2665  return 0;
2666 }
2667 
2668 /**
2669  * Decode the user data stuff in the header.
2670  * Also initializes divx/xvid/lavc_version/build.
2671  */
2673 {
2674  MpegEncContext *s = &ctx->m;
2675  char buf[256];
2676  int i;
2677  int e;
2678  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2679  char last;
2680 
2681  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2682  if (show_bits(gb, 23) == 0)
2683  break;
2684  buf[i] = get_bits(gb, 8);
2685  }
2686  buf[i] = 0;
2687 
2688  /* divx detection */
2689  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2690  if (e < 2)
2691  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2692  if (e >= 2) {
2693  ctx->divx_version = ver;
2694  ctx->divx_build = build;
2695  s->divx_packed = e == 3 && last == 'p';
2696  }
2697 
2698  /* libavcodec detection */
2699  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2700  if (e != 4)
2701  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2702  if (e != 4) {
2703  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2704  if (e > 1) {
2705  if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2706  av_log(s->avctx, AV_LOG_WARNING,
2707  "Unknown Lavc version string encountered, %d.%d.%d; "
2708  "clamping sub-version values to 8-bits.\n",
2709  ver, ver2, ver3);
2710  }
2711  build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2712  }
2713  }
2714  if (e != 4) {
2715  if (strcmp(buf, "ffmpeg") == 0)
2716  ctx->lavc_build = 4600;
2717  }
2718  if (e == 4)
2719  ctx->lavc_build = build;
2720 
2721  /* Xvid detection */
2722  e = sscanf(buf, "XviD%d", &build);
2723  if (e == 1)
2724  ctx->xvid_build = build;
2725 
2726  return 0;
2727 }
2728 
2730 {
2731  Mpeg4DecContext *ctx = avctx->priv_data;
2732  MpegEncContext *s = &ctx->m;
2733 
2734  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2735  if (s->codec_tag == AV_RL32("XVID") ||
2736  s->codec_tag == AV_RL32("XVIX") ||
2737  s->codec_tag == AV_RL32("RMP4") ||
2738  s->codec_tag == AV_RL32("ZMP4") ||
2739  s->codec_tag == AV_RL32("SIPP"))
2740  ctx->xvid_build = 0;
2741  }
2742 
2743  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2744  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2745  ctx->vol_control_parameters == 0)
2746  ctx->divx_version = 400; // divx 4
2747 
2748  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2749  ctx->divx_version =
2750  ctx->divx_build = -1;
2751  }
2752 
2753  if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2754  if (s->codec_tag == AV_RL32("XVIX"))
2755  s->workaround_bugs |= FF_BUG_XVID_ILACE;
2756 
2757  if (s->codec_tag == AV_RL32("UMP4"))
2758  s->workaround_bugs |= FF_BUG_UMP4;
2759 
2760  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2761  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2762 
2763  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2764  s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2765 
2766  if (ctx->xvid_build <= 3U)
2767  s->padding_bug_score = 256 * 256 * 256 * 64;
2768 
2769  if (ctx->xvid_build <= 1U)
2770  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2771 
2772  if (ctx->xvid_build <= 12U)
2773  s->workaround_bugs |= FF_BUG_EDGE;
2774 
2775  if (ctx->xvid_build <= 32U)
2776  s->workaround_bugs |= FF_BUG_DC_CLIP;
2777 
2778 #define SET_QPEL_FUNC(postfix1, postfix2) \
2779  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2780  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2781  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2782 
2783  if (ctx->lavc_build < 4653U)
2784  s->workaround_bugs |= FF_BUG_STD_QPEL;
2785 
2786  if (ctx->lavc_build < 4655U)
2787  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2788 
2789  if (ctx->lavc_build < 4670U)
2790  s->workaround_bugs |= FF_BUG_EDGE;
2791 
2792  if (ctx->lavc_build <= 4712U)
2793  s->workaround_bugs |= FF_BUG_DC_CLIP;
2794 
2795  if ((ctx->lavc_build&0xFF) >= 100) {
2796  if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2797  (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2798  )
2799  s->workaround_bugs |= FF_BUG_IEDGE;
2800  }
2801 
2802  if (ctx->divx_version >= 0)
2803  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2804  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2805  s->padding_bug_score = 256 * 256 * 256 * 64;
2806 
2807  if (ctx->divx_version < 500U)
2808  s->workaround_bugs |= FF_BUG_EDGE;
2809 
2810  if (ctx->divx_version >= 0)
2811  s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2812  }
2813 
2814  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2815  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2816  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2817  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2818  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2819  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2820  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2821 
2822  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2823  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2824  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2825  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2826  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2827  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2828  }
2829 
2830  if (avctx->debug & FF_DEBUG_BUGS)
2831  av_log(s->avctx, AV_LOG_DEBUG,
2832  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2833  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2834  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2835 
2836  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2837  s->codec_id == AV_CODEC_ID_MPEG4 &&
2838  avctx->idct_algo == FF_IDCT_AUTO) {
2839  avctx->idct_algo = FF_IDCT_XVID;
2841  return 1;
2842  }
2843 
2844  return 0;
2845 }
2846 
2848 {
2849  MpegEncContext *s = &ctx->m;
2850  int time_incr, time_increment;
2851  int64_t pts;
2852 
2853  s->mcsel = 0;
2854  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2855  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2856  ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2857  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2858  s->low_delay = 0;
2859  }
2860 
2861  s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2862  if (s->partitioned_frame)
2863  s->decode_mb = mpeg4_decode_partitioned_mb;
2864  else
2865  s->decode_mb = mpeg4_decode_mb;
2866 
2867  time_incr = 0;
2868  while (get_bits1(gb) != 0)
2869  time_incr++;
2870 
2871  check_marker(s->avctx, gb, "before time_increment");
2872 
2873  if (ctx->time_increment_bits == 0 ||
2874  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2875  av_log(s->avctx, AV_LOG_WARNING,
2876  "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);
2877 
2878  for (ctx->time_increment_bits = 1;
2879  ctx->time_increment_bits < 16;
2880  ctx->time_increment_bits++) {
2881  if (s->pict_type == AV_PICTURE_TYPE_P ||
2882  (s->pict_type == AV_PICTURE_TYPE_S &&
2883  ctx->vol_sprite_usage == GMC_SPRITE)) {
2884  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2885  break;
2886  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2887  break;
2888  }
2889 
2890  av_log(s->avctx, AV_LOG_WARNING,
2891  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2892  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2893  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2894  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2895  }
2896  }
2897 
2898  if (IS_3IV1)
2899  time_increment = get_bits1(gb); // FIXME investigate further
2900  else
2901  time_increment = get_bits(gb, ctx->time_increment_bits);
2902 
2903  if (s->pict_type != AV_PICTURE_TYPE_B) {
2904  s->last_time_base = s->time_base;
2905  s->time_base += time_incr;
2906  s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2907  if (s->workaround_bugs & FF_BUG_UMP4) {
2908  if (s->time < s->last_non_b_time) {
2909  /* header is not mpeg-4-compatible, broken encoder,
2910  * trying to workaround */
2911  s->time_base++;
2912  s->time += s->avctx->framerate.num;
2913  }
2914  }
2915  s->pp_time = s->time - s->last_non_b_time;
2916  s->last_non_b_time = s->time;
2917  } else {
2918  s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2919  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2920  if (s->pp_time <= s->pb_time ||
2921  s->pp_time <= s->pp_time - s->pb_time ||
2922  s->pp_time <= 0) {
2923  /* messed up order, maybe after seeking? skipping current B-frame */
2924  return FRAME_SKIPPED;
2925  }
2927 
2928  if (ctx->t_frame == 0)
2929  ctx->t_frame = s->pb_time;
2930  if (ctx->t_frame == 0)
2931  ctx->t_frame = 1; // 1/0 protection
2932  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2933  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2934  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2935  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2936  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2937  s->pb_field_time = 2;
2938  s->pp_field_time = 4;
2939  if (!s->progressive_sequence)
2940  return FRAME_SKIPPED;
2941  }
2942  }
2943 
2944  if (s->avctx->framerate.den)
2945  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2946  else
2947  pts = AV_NOPTS_VALUE;
2948  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2949 
2950  check_marker(s->avctx, gb, "before vop_coded");
2951 
2952  /* vop coded */
2953  if (get_bits1(gb) != 1) {
2954  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2955  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2956  return FRAME_SKIPPED;
2957  }
2958  if (ctx->new_pred)
2959  decode_new_pred(ctx, gb);
2960 
2961  if (ctx->shape != BIN_ONLY_SHAPE &&
2962  (s->pict_type == AV_PICTURE_TYPE_P ||
2963  (s->pict_type == AV_PICTURE_TYPE_S &&
2964  ctx->vol_sprite_usage == GMC_SPRITE))) {
2965  /* rounding type for motion estimation */
2966  s->no_rounding = get_bits1(gb);
2967  } else {
2968  s->no_rounding = 0;
2969  }
2970  // FIXME reduced res stuff
2971 
2972  if (ctx->shape != RECT_SHAPE) {
2973  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2974  skip_bits(gb, 13); /* width */
2975  check_marker(s->avctx, gb, "after width");
2976  skip_bits(gb, 13); /* height */
2977  check_marker(s->avctx, gb, "after height");
2978  skip_bits(gb, 13); /* hor_spat_ref */
2979  check_marker(s->avctx, gb, "after hor_spat_ref");
2980  skip_bits(gb, 13); /* ver_spat_ref */
2981  }
2982  skip_bits1(gb); /* change_CR_disable */
2983 
2984  if (get_bits1(gb) != 0)
2985  skip_bits(gb, 8); /* constant_alpha_value */
2986  }
2987 
2988  // FIXME complexity estimation stuff
2989 
2990  if (ctx->shape != BIN_ONLY_SHAPE) {
2991  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2992  if (s->pict_type != AV_PICTURE_TYPE_I)
2993  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2994  if (s->pict_type == AV_PICTURE_TYPE_B)
2995  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2996 
2997  if (get_bits_left(gb) < 3) {
2998  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2999  return AVERROR_INVALIDDATA;
3000  }
3001  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
3002  if (!s->progressive_sequence) {
3003  s->top_field_first = get_bits1(gb);
3004  s->alternate_scan = get_bits1(gb);
3005  } else
3006  s->alternate_scan = 0;
3007  }
3008 
3009  if (s->alternate_scan) {
3010  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3011  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3012  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3013  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3014  } else {
3015  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3016  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3017  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3018  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3019  }
3020 
3021  if (s->pict_type == AV_PICTURE_TYPE_S) {
3022  if((ctx->vol_sprite_usage == STATIC_SPRITE ||
3023  ctx->vol_sprite_usage == GMC_SPRITE)) {
3024  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
3025  return AVERROR_INVALIDDATA;
3026  if (ctx->sprite_brightness_change)
3027  av_log(s->avctx, AV_LOG_ERROR,
3028  "sprite_brightness_change not supported\n");
3029  if (ctx->vol_sprite_usage == STATIC_SPRITE)
3030  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
3031  } else {
3032  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
3033  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
3034  }
3035  }
3036 
3037  if (ctx->shape != BIN_ONLY_SHAPE) {
3038  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
3039  if (s->qscale == 0) {
3040  av_log(s->avctx, AV_LOG_ERROR,
3041  "Error, header damaged or not MPEG-4 header (qscale=0)\n");
3042  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
3043  }
3044 
3045  if (s->pict_type != AV_PICTURE_TYPE_I) {
3046  s->f_code = get_bits(gb, 3); /* fcode_for */
3047  if (s->f_code == 0) {
3048  av_log(s->avctx, AV_LOG_ERROR,
3049  "Error, header damaged or not MPEG-4 header (f_code=0)\n");
3050  s->f_code = 1;
3051  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
3052  }
3053  } else
3054  s->f_code = 1;
3055 
3056  if (s->pict_type == AV_PICTURE_TYPE_B) {
3057  s->b_code = get_bits(gb, 3);
3058  if (s->b_code == 0) {
3059  av_log(s->avctx, AV_LOG_ERROR,
3060  "Error, header damaged or not MPEG4 header (b_code=0)\n");
3061  s->b_code=1;
3062  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
3063  }
3064  } else
3065  s->b_code = 1;
3066 
3067  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
3068  av_log(s->avctx, AV_LOG_DEBUG,
3069  "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",
3070  s->qscale, s->f_code, s->b_code,
3071  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")),
3072  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
3073  s->top_field_first, s->quarter_sample ? "q" : "h",
3074  s->data_partitioning, ctx->resync_marker,
3075  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
3076  1 - s->no_rounding, s->vo_type,
3077  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
3078  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
3079  ctx->cplx_estimation_trash_b,
3080  s->time,
3081  time_increment
3082  );
3083  }
3084 
3085  if (!ctx->scalability) {
3086  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
3087  skip_bits1(gb); // vop shape coding type
3088  } else {
3089  if (ctx->enhancement_type) {
3090  int load_backward_shape = get_bits1(gb);
3091  if (load_backward_shape)
3092  av_log(s->avctx, AV_LOG_ERROR,
3093  "load backward shape isn't supported\n");
3094  }
3095  skip_bits(gb, 2); // ref_select_code
3096  }
3097  }
3098  /* detect buggy encoders which don't set the low_delay flag
3099  * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
3100  * easily (although it's buggy too) */
3101  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
3102  ctx->divx_version == -1 && s->picture_number == 0) {
3103  av_log(s->avctx, AV_LOG_WARNING,
3104  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
3105  s->low_delay = 1;
3106  }
3107 
3108  s->picture_number++; // better than pic number==0 always ;)
3109 
3110  // FIXME add short header support
3111  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
3112  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
3113 
3114  if (s->workaround_bugs & FF_BUG_EDGE) {
3115  s->h_edge_pos = s->width;
3116  s->v_edge_pos = s->height;
3117  }
3118  return 0;
3119 }
3120 
3122 {
3123  MpegEncContext *s = &ctx->m;
3124 
3125  skip_bits(gb, 16); /* Time_code[63..48] */
3126  check_marker(s->avctx, gb, "after Time_code[63..48]");
3127  skip_bits(gb, 16); /* Time_code[47..32] */
3128  check_marker(s->avctx, gb, "after Time_code[47..32]");
3129  skip_bits(gb, 16); /* Time_code[31..16] */
3130  check_marker(s->avctx, gb, "after Time_code[31..16]");
3131  skip_bits(gb, 16); /* Time_code[15..0] */
3132  check_marker(s->avctx, gb, "after Time_code[15..0]");
3133  skip_bits(gb, 4); /* reserved_bits */
3134 }
3135 
3136 /**
3137  * Decode the next studio vop header.
3138  * @return <0 if something went wrong
3139  */
3141 {
3142  MpegEncContext *s = &ctx->m;
3143 
3144  if (get_bits_left(gb) <= 32)
3145  return 0;
3146 
3147  s->partitioned_frame = 0;
3148  s->interlaced_dct = 0;
3149  s->decode_mb = mpeg4_decode_studio_mb;
3150 
3151  decode_smpte_tc(ctx, gb);
3152 
3153  skip_bits(gb, 10); /* temporal_reference */
3154  skip_bits(gb, 2); /* vop_structure */
3155  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
3156  if (get_bits1(gb)) { /* vop_coded */
3157  skip_bits1(gb); /* top_field_first */
3158  skip_bits1(gb); /* repeat_first_field */
3159  s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
3160  }
3161 
3162  if (s->pict_type == AV_PICTURE_TYPE_I) {
3163  if (get_bits1(gb))
3165  }
3166 
3167  if (ctx->shape != BIN_ONLY_SHAPE) {
3168  s->alternate_scan = get_bits1(gb);
3169  s->frame_pred_frame_dct = get_bits1(gb);
3170  s->dct_precision = get_bits(gb, 2);
3171  s->intra_dc_precision = get_bits(gb, 2);
3172  s->q_scale_type = get_bits1(gb);
3173  }
3174 
3175  if (s->alternate_scan) {
3176  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3177  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3178  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3179  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3180  } else {
3181  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3182  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3183  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3184  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3185  }
3186 
3188 
3190  extension_and_user_data(s, gb, 4);
3191 
3192  return 0;
3193 }
3194 
3196 {
3197  MpegEncContext *s = &ctx->m;
3198  int visual_object_type;
3199 
3200  skip_bits(gb, 4); /* visual_object_verid */
3201  visual_object_type = get_bits(gb, 4);
3202  if (visual_object_type != VOT_VIDEO_ID) {
3203  avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
3204  return AVERROR_PATCHWELCOME;
3205  }
3206 
3208  extension_and_user_data(s, gb, 1);
3209 
3210  return 0;
3211 }
3212 
3213 /**
3214  * Decode MPEG-4 headers.
3215  *
3216  * @param header If set the absence of a VOP is not treated as error; otherwise, it is treated as such.
3217  * @return <0 if an error occurred
3218  * FRAME_SKIPPED if a not coded VOP is found
3219  * 0 else
3220  */
3222 {
3223  MpegEncContext *s = &ctx->m;
3224  unsigned startcode, v;
3225  int ret;
3226  int vol = 0;
3227 
3228  /* search next start code */
3229  align_get_bits(gb);
3230 
3231  // If we have not switched to studio profile than we also did not switch bps
3232  // that means something else (like a previous instance) outside set bps which
3233  // would be inconsistant with the currect state, thus reset it
3234  if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
3235  s->avctx->bits_per_raw_sample = 0;
3236 
3237  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
3238  skip_bits(gb, 24);
3239  if (get_bits(gb, 8) == 0xF0)
3240  goto end;
3241  }
3242 
3243  startcode = 0xff;
3244  for (;;) {
3245  if (get_bits_count(gb) >= gb->size_in_bits) {
3246  if (gb->size_in_bits == 8 &&
3247  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
3248  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
3249  return FRAME_SKIPPED; // divx bug
3250  } else if (header && get_bits_count(gb) == gb->size_in_bits) {
3251  return 0; // ordinary return value for parsing of extradata
3252  } else
3253  return AVERROR_INVALIDDATA; // end of stream
3254  }
3255 
3256  /* use the bits after the test */
3257  v = get_bits(gb, 8);
3258  startcode = ((startcode << 8) | v) & 0xffffffff;
3259 
3260  if ((startcode & 0xFFFFFF00) != 0x100)
3261  continue; // no startcode
3262 
3263  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
3264  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
3265  if (startcode <= 0x11F)
3266  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
3267  else if (startcode <= 0x12F)
3268  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
3269  else if (startcode <= 0x13F)
3270  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3271  else if (startcode <= 0x15F)
3272  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
3273  else if (startcode <= 0x1AF)
3274  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3275  else if (startcode == 0x1B0)
3276  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
3277  else if (startcode == 0x1B1)
3278  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
3279  else if (startcode == 0x1B2)
3280  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
3281  else if (startcode == 0x1B3)
3282  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
3283  else if (startcode == 0x1B4)
3284  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
3285  else if (startcode == 0x1B5)
3286  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
3287  else if (startcode == 0x1B6)
3288  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
3289  else if (startcode == 0x1B7)
3290  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
3291  else if (startcode == 0x1B8)
3292  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
3293  else if (startcode == 0x1B9)
3294  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
3295  else if (startcode == 0x1BA)
3296  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
3297  else if (startcode == 0x1BB)
3298  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
3299  else if (startcode == 0x1BC)
3300  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
3301  else if (startcode == 0x1BD)
3302  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
3303  else if (startcode == 0x1BE)
3304  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
3305  else if (startcode == 0x1BF)
3306  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
3307  else if (startcode == 0x1C0)
3308  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
3309  else if (startcode == 0x1C1)
3310  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
3311  else if (startcode == 0x1C2)
3312  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
3313  else if (startcode == 0x1C3)
3314  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
3315  else if (startcode <= 0x1C5)
3316  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
3317  else if (startcode <= 0x1FF)
3318  av_log(s->avctx, AV_LOG_DEBUG, "System start");
3319  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
3320  }
3321 
3322  if (startcode >= 0x120 && startcode <= 0x12F) {
3323  if (vol) {
3324  av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
3325  continue;
3326  }
3327  vol++;
3328  if ((ret = decode_vol_header(ctx, gb)) < 0)
3329  return ret;
3330  } else if (startcode == USER_DATA_STARTCODE) {
3331  decode_user_data(ctx, gb);
3332  } else if (startcode == GOP_STARTCODE) {
3334  } else if (startcode == VOS_STARTCODE) {
3335  int profile, level;
3338  (level > 0 && level < 9)) {
3339  s->studio_profile = 1;
3341  extension_and_user_data(s, gb, 0);
3342  } else if (s->studio_profile) {
3343  avpriv_request_sample(s->avctx, "Mix of studio and non studio profile");
3344  return AVERROR_PATCHWELCOME;
3345  }
3346  s->avctx->profile = profile;
3347  s->avctx->level = level;
3348  } else if (startcode == VISUAL_OBJ_STARTCODE) {
3349  if (s->studio_profile) {
3350  if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
3351  return ret;
3352  } else
3354  } else if (startcode == VOP_STARTCODE) {
3355  break;
3356  }
3357 
3358  align_get_bits(gb);
3359  startcode = 0xff;
3360  }
3361 
3362 end:
3363  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
3364  s->low_delay = 1;
3365  s->avctx->has_b_frames = !s->low_delay;
3366 
3367  if (s->studio_profile) {
3368  if (!s->avctx->bits_per_raw_sample) {
3369  av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
3370  return AVERROR_INVALIDDATA;
3371  }
3372  return decode_studio_vop_header(ctx, gb);
3373  } else
3374  return decode_vop_header(ctx, gb);
3375 }
3376 
3378  static int done = 0;
3379 
3380  if (!done) {
3387  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
3388  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
3389  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
3390  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
3391  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
3392  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
3395  NULL, 0, 0, 0, 0, 128);
3397  &ff_mb_type_b_tab[0][1], 2, 1,
3398  &ff_mb_type_b_tab[0][0], 2, 1, 16);
3399  done = 1;
3400  }
3401 }
3402 
3403 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
3404 {
3405  Mpeg4DecContext *ctx = avctx->priv_data;
3406  MpegEncContext *s = &ctx->m;
3407 
3408  /* divx 5.01+ bitstream reorder stuff */
3409  /* Since this clobbers the input buffer and hwaccel codecs still need the
3410  * data during hwaccel->end_frame we should not do this any earlier */
3411  if (s->divx_packed) {
3412  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
3413  int startcode_found = 0;
3414 
3415  if (buf_size - current_pos > 7) {
3416 
3417  int i;
3418  for (i = current_pos; i < buf_size - 4; i++)
3419 
3420  if (buf[i] == 0 &&
3421  buf[i + 1] == 0 &&
3422  buf[i + 2] == 1 &&
3423  buf[i + 3] == 0xB6) {
3424  startcode_found = !(buf[i + 4] & 0x40);
3425  break;
3426  }
3427  }
3428 
3429  if (startcode_found) {
3430  if (!ctx->showed_packed_warning) {
3431  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
3432  "wasteful way to store B-frames ('packed B-frames'). "
3433  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
3434  ctx->showed_packed_warning = 1;
3435  }
3436  av_fast_padded_malloc(&s->bitstream_buffer,
3437  &s->allocated_bitstream_buffer_size,
3438  buf_size - current_pos);
3439  if (!s->bitstream_buffer) {
3440  s->bitstream_buffer_size = 0;
3441  return AVERROR(ENOMEM);
3442  }
3443  memcpy(s->bitstream_buffer, buf + current_pos,
3444  buf_size - current_pos);
3445  s->bitstream_buffer_size = buf_size - current_pos;
3446  }
3447  }
3448 
3449  return 0;
3450 }
3451 
3452 #if HAVE_THREADS
3453 static int mpeg4_update_thread_context(AVCodecContext *dst,
3454  const AVCodecContext *src)
3455 {
3456  Mpeg4DecContext *s = dst->priv_data;
3457  const Mpeg4DecContext *s1 = src->priv_data;
3458  int init = s->m.context_initialized;
3459 
3460  int ret = ff_mpeg_update_thread_context(dst, src);
3461 
3462  if (ret < 0)
3463  return ret;
3464 
3465  // copy all the necessary fields explicitly
3466  s->time_increment_bits = s1->time_increment_bits;
3467  s->shape = s1->shape;
3468  s->vol_sprite_usage = s1->vol_sprite_usage;
3469  s->sprite_brightness_change = s1->sprite_brightness_change;
3470  s->num_sprite_warping_points = s1->num_sprite_warping_points;
3471  s->rvlc = s1->rvlc;
3472  s->resync_marker = s1->resync_marker;
3473  s->t_frame = s1->t_frame;
3474  s->new_pred = s1->new_pred;
3475  s->enhancement_type = s1->enhancement_type;
3476  s->scalability = s1->scalability;
3477  s->use_intra_dc_vlc = s1->use_intra_dc_vlc;
3478  s->intra_dc_threshold = s1->intra_dc_threshold;
3479  s->divx_version = s1->divx_version;
3480  s->divx_build = s1->divx_build;
3481  s->xvid_build = s1->xvid_build;
3482  s->lavc_build = s1->lavc_build;
3483  s->showed_packed_warning = s1->showed_packed_warning;
3484  s->vol_control_parameters = s1->vol_control_parameters;
3485  s->cplx_estimation_trash_i = s1->cplx_estimation_trash_i;
3486  s->cplx_estimation_trash_p = s1->cplx_estimation_trash_p;
3487  s->cplx_estimation_trash_b = s1->cplx_estimation_trash_b;
3488  s->rgb = s1->rgb;
3489 
3490  memcpy(s->sprite_shift, s1->sprite_shift, sizeof(s1->sprite_shift));
3491  memcpy(s->sprite_traj, s1->sprite_traj, sizeof(s1->sprite_traj));
3492 
3493  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
3494  ff_xvid_idct_init(&s->m.idsp, dst);
3495 
3496  return 0;
3497 }
3498 #endif
3499 
3500 static av_cold void mpeg4_init_static(void)
3501 {
3503  &ff_mpeg4_studio_dc_luma[0][1], 2,
3504  &ff_mpeg4_studio_dc_luma[0][0], 2, 1,
3505  0, 0, 528);
3506 
3508  &ff_mpeg4_studio_dc_chroma[0][1], 2,
3509  &ff_mpeg4_studio_dc_chroma[0][0], 2, 1,
3510  0, 0, 528);
3511 
3512  for (unsigned i = 0, offset = 0; i < 12; i++) {
3513  static VLC_TYPE vlc_buf[6498][2];
3514 
3518  STUDIO_INTRA_BITS, 24,
3519  &ff_mpeg4_studio_intra[i][0][1], 2,
3520  &ff_mpeg4_studio_intra[i][0][0], 2, 1,
3523  }
3525 }
3526 
3528 {
3529  static AVOnce init_static_once = AV_ONCE_INIT;
3530  Mpeg4DecContext *ctx = avctx->priv_data;
3531  MpegEncContext *s = &ctx->m;
3532  int ret;
3533 
3534  ctx->divx_version =
3535  ctx->divx_build =
3536  ctx->xvid_build =
3537  ctx->lavc_build = -1;
3538 
3539  if ((ret = ff_h263_decode_init(avctx)) < 0)
3540  return ret;
3541 
3542  s->h263_pred = 1;
3543  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
3544  s->decode_mb = mpeg4_decode_mb;
3545  ctx->time_increment_bits = 4; /* default value for broken headers */
3546 
3548 
3549  ff_thread_once(&init_static_once, mpeg4_init_static);
3550 
3551  return 0;
3552 }
3553 
3554 #define OFFSET(x) offsetof(MpegEncContext, x)
3555 #define FLAGS AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY
3556 static const AVOption mpeg4_options[] = {
3557  {"quarter_sample", "1/4 subpel MC", OFFSET(quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
3558  {"divx_packed", "divx style packed b frames", OFFSET(divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
3559  {NULL}
3560 };
3561 
3562 static const AVClass mpeg4_class = {
3563  .class_name = "MPEG4 Video Decoder",
3564  .item_name = av_default_item_name,
3565  .option = mpeg4_options,
3566  .version = LIBAVUTIL_VERSION_INT,
3567 };
3568 
3570  .name = "mpeg4",
3571  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
3572  .type = AVMEDIA_TYPE_VIDEO,
3573  .id = AV_CODEC_ID_MPEG4,
3574  .priv_data_size = sizeof(Mpeg4DecContext),
3575  .init = decode_init,
3576  .close = ff_h263_decode_end,
3581  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
3583  .flush = ff_mpeg_flush,
3584  .max_lowres = 3,
3587  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
3588  .priv_class = &mpeg4_class,
3589  .hw_configs = (const AVCodecHWConfigInternal *const []) {
3590 #if CONFIG_MPEG4_NVDEC_HWACCEL
3591  HWACCEL_NVDEC(mpeg4),
3592 #endif
3593 #if CONFIG_MPEG4_VAAPI_HWACCEL
3594  HWACCEL_VAAPI(mpeg4),
3595 #endif
3596 #if CONFIG_MPEG4_VDPAU_HWACCEL
3597  HWACCEL_VDPAU(mpeg4),
3598 #endif
3599 #if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
3600  HWACCEL_VIDEOTOOLBOX(mpeg4),
3601 #endif
3602  NULL
3603  },
3604 };
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 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
#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