FFmpeg  4.3.9
mpeg4videodec.c
Go to the documentation of this file.
1 /*
2  * MPEG-4 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define UNCHECKED_BITSTREAM_READER 1
24 
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/pixdesc.h"
28 #include "error_resilience.h"
29 #include "hwconfig.h"
30 #include "idctdsp.h"
31 #include "internal.h"
32 #include "mpegutils.h"
33 #include "mpegvideo.h"
34 #include "mpegvideodata.h"
35 #include "mpeg4video.h"
36 #include "h263.h"
37 #include "profiles.h"
38 #include "thread.h"
39 #include "xvididct.h"
40 #include "unary.h"
41 
42 /* The defines below define the number of bits that are read at once for
43  * reading vlc values. Changing these may improve speed and data cache needs
44  * be aware though that decreasing them may need the number of stages that is
45  * passed to get_vlc* to be increased. */
46 #define SPRITE_TRAJ_VLC_BITS 6
47 #define DC_VLC_BITS 9
48 #define MB_TYPE_B_VLC_BITS 4
49 #define STUDIO_INTRA_BITS 9
50 
52 
56 
57 static const int mb_type_b_map[4] = {
62 };
63 
64 /**
65  * Predict the ac.
66  * @param n block index (0-3 are luma, 4-5 are chroma)
67  * @param dir the ac prediction direction
68  */
69 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
70 {
71  int i;
72  int16_t *ac_val, *ac_val1;
73  int8_t *const qscale_table = s->current_picture.qscale_table;
74 
75  /* find prediction */
76  ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
77  ac_val1 = ac_val;
78  if (s->ac_pred) {
79  if (dir == 0) {
80  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
81  /* left prediction */
82  ac_val -= 16;
83 
84  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
85  n == 1 || n == 3) {
86  /* same qscale */
87  for (i = 1; i < 8; i++)
88  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
89  } else {
90  /* different qscale, we must rescale */
91  for (i = 1; i < 8; i++)
92  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
93  }
94  } else {
95  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
96  /* top prediction */
97  ac_val -= 16 * s->block_wrap[n];
98 
99  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
100  n == 2 || n == 3) {
101  /* same qscale */
102  for (i = 1; i < 8; i++)
103  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
104  } else {
105  /* different qscale, we must rescale */
106  for (i = 1; i < 8; i++)
107  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
108  }
109  }
110  }
111  /* left copy */
112  for (i = 1; i < 8; i++)
113  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
114 
115  /* top copy */
116  for (i = 1; i < 8; i++)
117  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
118 }
119 
120 /**
121  * check if the next stuff is a resync marker or the end.
122  * @return 0 if not
123  */
125 {
126  MpegEncContext *s = &ctx->m;
127  int bits_count = get_bits_count(&s->gb);
128  int v = show_bits(&s->gb, 16);
129 
131  return 0;
132 
133  while (v <= 0xFF) {
134  if (s->pict_type == AV_PICTURE_TYPE_B ||
135  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
136  break;
137  skip_bits(&s->gb, 8 + s->pict_type);
138  bits_count += 8 + s->pict_type;
139  v = show_bits(&s->gb, 16);
140  }
141 
142  if (bits_count + 8 >= s->gb.size_in_bits) {
143  v >>= 8;
144  v |= 0x7F >> (7 - (bits_count & 7));
145 
146  if (v == 0x7F)
147  return s->mb_num;
148  } else {
149  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
150  int len, mb_num;
151  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
152  GetBitContext gb = s->gb;
153 
154  skip_bits(&s->gb, 1);
155  align_get_bits(&s->gb);
156 
157  for (len = 0; len < 32; len++)
158  if (get_bits1(&s->gb))
159  break;
160 
161  mb_num = get_bits(&s->gb, mb_num_bits);
162  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
163  mb_num= -1;
164 
165  s->gb = gb;
166 
168  return mb_num;
169  }
170  }
171  return 0;
172 }
173 
175 {
176  MpegEncContext *s = &ctx->m;
177  int a = 2 << s->sprite_warping_accuracy;
178  int rho = 3 - s->sprite_warping_accuracy;
179  int r = 16 / a;
180  int alpha = 1;
181  int beta = 0;
182  int w = s->width;
183  int h = s->height;
184  int min_ab, i, w2, h2, w3, h3;
185  int sprite_ref[4][2];
186  int virtual_ref[2][2];
187  int64_t sprite_offset[2][2];
188  int64_t sprite_delta[2][2];
189 
190  // only true for rectangle shapes
191  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
192  { 0, s->height }, { s->width, s->height } };
193  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
194 
195  if (w <= 0 || h <= 0)
196  return AVERROR_INVALIDDATA;
197 
198  /* the decoder was not properly initialized and we cannot continue */
199  if (sprite_trajectory.table == NULL)
200  return AVERROR_INVALIDDATA;
201 
202  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
203  int length;
204  int x = 0, y = 0;
205 
206  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
207  if (length > 0)
208  x = get_xbits(gb, length);
209 
210  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
211  check_marker(s->avctx, gb, "before sprite_trajectory");
212 
213  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
214  if (length > 0)
215  y = get_xbits(gb, length);
216 
217  check_marker(s->avctx, gb, "after sprite_trajectory");
218  ctx->sprite_traj[i][0] = d[i][0] = x;
219  ctx->sprite_traj[i][1] = d[i][1] = y;
220  }
221  for (; i < 4; i++)
222  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
223 
224  while ((1 << alpha) < w)
225  alpha++;
226  while ((1 << beta) < h)
227  beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
228  w2 = 1 << alpha;
229  h2 = 1 << beta;
230 
231  // Note, the 4th point isn't used for GMC
232  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
233  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
234  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
235  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
236  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
237  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
238  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
239  } else {
240  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
241  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
242  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
243  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
244  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
245  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
246  }
247  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
248  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
249 
250  /* This is mostly identical to the MPEG-4 std (and is totally unreadable
251  * because of that...). Perhaps it should be reordered to be more readable.
252  * The idea behind this virtual_ref mess is to be able to use shifts later
253  * per pixel instead of divides so the distance between points is converted
254  * from w&h based to w2&h2 based which are of the 2^x form. */
255  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
256  ROUNDED_DIV(((w - w2) *
257  (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
258  w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
259  virtual_ref[0][1] = 16 * vop_ref[0][1] +
260  ROUNDED_DIV(((w - w2) *
261  (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
262  w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
263  virtual_ref[1][0] = 16 * vop_ref[0][0] +
264  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
265  h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
266  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
267  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
268  h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
269 
270  switch (ctx->num_sprite_warping_points) {
271  case 0:
272  sprite_offset[0][0] =
273  sprite_offset[0][1] =
274  sprite_offset[1][0] =
275  sprite_offset[1][1] = 0;
276  sprite_delta[0][0] = a;
277  sprite_delta[0][1] =
278  sprite_delta[1][0] = 0;
279  sprite_delta[1][1] = a;
280  ctx->sprite_shift[0] =
281  ctx->sprite_shift[1] = 0;
282  break;
283  case 1: // GMC only
284  sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
285  sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
286  sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
287  a * (vop_ref[0][0] / 2);
288  sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
289  a * (vop_ref[0][1] / 2);
290  sprite_delta[0][0] = a;
291  sprite_delta[0][1] =
292  sprite_delta[1][0] = 0;
293  sprite_delta[1][1] = a;
294  ctx->sprite_shift[0] =
295  ctx->sprite_shift[1] = 0;
296  break;
297  case 2:
298  sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
299  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
300  ((int64_t) -vop_ref[0][0]) +
301  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
302  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
303  sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
304  ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
305  ((int64_t) -vop_ref[0][0]) +
306  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
307  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
308  sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
309  ((int64_t)-2 * vop_ref[0][0] + 1) +
310  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
311  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
312  (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
313  sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
314  ((int64_t)-2 * vop_ref[0][0] + 1) +
315  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
316  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
317  (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
318  sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
319  sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
320  sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
321  sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
322 
323  ctx->sprite_shift[0] = alpha + rho;
324  ctx->sprite_shift[1] = alpha + rho + 2;
325  break;
326  case 3:
327  min_ab = FFMIN(alpha, beta);
328  w3 = w2 >> min_ab;
329  h3 = h2 >> min_ab;
330  sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
331  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
332  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
333  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
334  sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
335  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
336  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
337  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
338  sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
339  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
340  (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
341  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
342  sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
343  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
344  (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
345  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
346  sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
347  sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
348  sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
349  sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
350 
351  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
352  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
353  break;
354  default:
355  av_assert0(0);
356  }
357  /* try to simplify the situation */
358  if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
359  sprite_delta[0][1] == 0 &&
360  sprite_delta[1][0] == 0 &&
361  sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
362  sprite_offset[0][0] >>= ctx->sprite_shift[0];
363  sprite_offset[0][1] >>= ctx->sprite_shift[0];
364  sprite_offset[1][0] >>= ctx->sprite_shift[1];
365  sprite_offset[1][1] >>= ctx->sprite_shift[1];
366  sprite_delta[0][0] = a;
367  sprite_delta[0][1] = 0;
368  sprite_delta[1][0] = 0;
369  sprite_delta[1][1] = a;
370  ctx->sprite_shift[0] = 0;
371  ctx->sprite_shift[1] = 0;
373  } else {
374  int shift_y = 16 - ctx->sprite_shift[0];
375  int shift_c = 16 - ctx->sprite_shift[1];
376 
377  for (i = 0; i < 2; i++) {
378  if (shift_c < 0 || shift_y < 0 ||
379  FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
380  FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
381  FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
382  FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
383  ) {
384  avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
385  goto overflow;
386  }
387  }
388 
389  for (i = 0; i < 2; i++) {
390  sprite_offset[0][i] *= 1 << shift_y;
391  sprite_offset[1][i] *= 1 << shift_c;
392  sprite_delta[0][i] *= 1 << shift_y;
393  sprite_delta[1][i] *= 1 << shift_y;
394  ctx->sprite_shift[i] = 16;
395 
396  }
397  for (i = 0; i < 2; i++) {
398  int64_t sd[2] = {
399  sprite_delta[i][0] - a * (1LL<<16),
400  sprite_delta[i][1] - a * (1LL<<16)
401  };
402 
403  if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
404  llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
405  llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
406  llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
407  llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
408  llabs(sd[0]) >= INT_MAX ||
409  llabs(sd[1]) >= INT_MAX ||
410  llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
411  llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
412  llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
413  ) {
414  avpriv_request_sample(s->avctx, "Overflow on sprite points");
415  goto overflow;
416  }
417  }
419  }
420 
421  for (i = 0; i < 4; i++) {
422  s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
423  s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
424  }
425 
426  return 0;
427 overflow:
428  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
429  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
430  return AVERROR_PATCHWELCOME;
431 }
432 
434  MpegEncContext *s = &ctx->m;
435  int len = FFMIN(ctx->time_increment_bits + 3, 15);
436 
437  get_bits(gb, len);
438  if (get_bits1(gb))
439  get_bits(gb, len);
440  check_marker(s->avctx, gb, "after new_pred");
441 
442  return 0;
443 }
444 
445 /**
446  * Decode the next video packet.
447  * @return <0 if something went wrong
448  */
450 {
451  MpegEncContext *s = &ctx->m;
452 
453  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
454  int header_extension = 0, mb_num, len;
455 
456  /* is there enough space left for a video packet + header */
457  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
458  return AVERROR_INVALIDDATA;
459 
460  for (len = 0; len < 32; len++)
461  if (get_bits1(&s->gb))
462  break;
463 
465  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
466  return AVERROR_INVALIDDATA;
467  }
468 
469  if (ctx->shape != RECT_SHAPE) {
470  header_extension = get_bits1(&s->gb);
471  // FIXME more stuff here
472  }
473 
474  mb_num = get_bits(&s->gb, mb_num_bits);
475  if (mb_num >= s->mb_num || !mb_num) {
477  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
478  return AVERROR_INVALIDDATA;
479  }
480 
481  s->mb_x = mb_num % s->mb_width;
482  s->mb_y = mb_num / s->mb_width;
483 
484  if (ctx->shape != BIN_ONLY_SHAPE) {
485  int qscale = get_bits(&s->gb, s->quant_precision);
486  if (qscale)
487  s->chroma_qscale = s->qscale = qscale;
488  }
489 
490  if (ctx->shape == RECT_SHAPE)
491  header_extension = get_bits1(&s->gb);
492 
493  if (header_extension) {
494  int time_incr = 0;
495 
496  while (get_bits1(&s->gb) != 0)
497  time_incr++;
498 
499  check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
500  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
501  check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
502 
503  skip_bits(&s->gb, 2); /* vop coding type */
504  // FIXME not rect stuff here
505 
506  if (ctx->shape != BIN_ONLY_SHAPE) {
507  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
508  // FIXME don't just ignore everything
509  if (s->pict_type == AV_PICTURE_TYPE_S &&
510  ctx->vol_sprite_usage == GMC_SPRITE) {
511  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
512  return AVERROR_INVALIDDATA;
513  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
514  }
515 
516  // FIXME reduced res stuff here
517 
518  if (s->pict_type != AV_PICTURE_TYPE_I) {
519  int f_code = get_bits(&s->gb, 3); /* fcode_for */
520  if (f_code == 0)
522  "Error, video packet header damaged (f_code=0)\n");
523  }
524  if (s->pict_type == AV_PICTURE_TYPE_B) {
525  int b_code = get_bits(&s->gb, 3);
526  if (b_code == 0)
528  "Error, video packet header damaged (b_code=0)\n");
529  }
530  }
531  }
532  if (ctx->new_pred)
533  decode_new_pred(ctx, &s->gb);
534 
535  return 0;
536 }
537 
539 {
540  /* Reset DC Predictors */
541  s->last_dc[0] =
542  s->last_dc[1] =
543  s->last_dc[2] = 1 << (s->avctx->bits_per_raw_sample + s->dct_precision + s->intra_dc_precision - 1);
544 }
545 
546 /**
547  * Decode the next video packet.
548  * @return <0 if something went wrong
549  */
551 {
552  MpegEncContext *s = &ctx->m;
553  GetBitContext *gb = &s->gb;
554  unsigned vlc_len;
555  uint16_t mb_num;
556 
557  if (get_bits_left(gb) >= 32 && get_bits_long(gb, 32) == SLICE_START_CODE) {
558  vlc_len = av_log2(s->mb_width * s->mb_height) + 1;
559  mb_num = get_bits(gb, vlc_len);
560 
561  if (mb_num >= s->mb_num)
562  return AVERROR_INVALIDDATA;
563 
564  s->mb_x = mb_num % s->mb_width;
565  s->mb_y = mb_num / s->mb_width;
566 
567  if (ctx->shape != BIN_ONLY_SHAPE)
568  s->qscale = mpeg_get_qscale(s);
569 
570  if (get_bits1(gb)) { /* slice_extension_flag */
571  skip_bits1(gb); /* intra_slice */
572  skip_bits1(gb); /* slice_VOP_id_enable */
573  skip_bits(gb, 6); /* slice_VOP_id */
574  while (get_bits1(gb)) /* extra_bit_slice */
575  skip_bits(gb, 8); /* extra_information_slice */
576  }
577 
579  }
580  else {
581  return AVERROR_INVALIDDATA;
582  }
583 
584  return 0;
585 }
586 
587 /**
588  * Get the average motion vector for a GMC MB.
589  * @param n either 0 for the x component or 1 for y
590  * @return the average MV for a GMC MB
591  */
592 static inline int get_amv(Mpeg4DecContext *ctx, int n)
593 {
594  MpegEncContext *s = &ctx->m;
595  int x, y, mb_v, sum, dx, dy, shift;
596  int len = 1 << (s->f_code + 4);
597  const int a = s->sprite_warping_accuracy;
598 
599  if (s->workaround_bugs & FF_BUG_AMV)
600  len >>= s->quarter_sample;
601 
602  if (s->real_sprite_warping_points == 1) {
603  if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
604  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
605  else
606  sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
607  } else {
608  dx = s->sprite_delta[n][0];
609  dy = s->sprite_delta[n][1];
610  shift = ctx->sprite_shift[0];
611  if (n)
612  dy -= 1 << (shift + a + 1);
613  else
614  dx -= 1 << (shift + a + 1);
615  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16U + dy * s->mb_y * 16U;
616 
617  sum = 0;
618  for (y = 0; y < 16; y++) {
619  int v;
620 
621  v = mb_v + (unsigned)dy * y;
622  // FIXME optimize
623  for (x = 0; x < 16; x++) {
624  sum += v >> shift;
625  v += dx;
626  }
627  }
628  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
629  }
630 
631  if (sum < -len)
632  sum = -len;
633  else if (sum >= len)
634  sum = len - 1;
635 
636  return sum;
637 }
638 
639 /**
640  * Decode the dc value.
641  * @param n block index (0-3 are luma, 4-5 are chroma)
642  * @param dir_ptr the prediction direction will be stored here
643  * @return the quantized dc
644  */
645 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
646 {
647  int level, code;
648 
649  if (n < 4)
650  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
651  else
652  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
653 
654  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
655  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
656  return AVERROR_INVALIDDATA;
657  }
658 
659  if (code == 0) {
660  level = 0;
661  } else {
662  if (IS_3IV1) {
663  if (code == 1)
664  level = 2 * get_bits1(&s->gb) - 1;
665  else {
666  if (get_bits1(&s->gb))
667  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
668  else
669  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
670  }
671  } else {
672  level = get_xbits(&s->gb, code);
673  }
674 
675  if (code > 8) {
676  if (get_bits1(&s->gb) == 0) { /* marker */
678  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
679  return AVERROR_INVALIDDATA;
680  }
681  }
682  }
683  }
684 
685  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
686 }
687 
688 /**
689  * Decode first partition.
690  * @return number of MBs decoded or <0 if an error occurred
691  */
693 {
694  MpegEncContext *s = &ctx->m;
695  int mb_num = 0;
696  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
697 
698  /* decode first partition */
699  s->first_slice_line = 1;
700  for (; s->mb_y < s->mb_height; s->mb_y++) {
702  for (; s->mb_x < s->mb_width; s->mb_x++) {
703  const int xy = s->mb_x + s->mb_y * s->mb_stride;
704  int cbpc;
705  int dir = 0;
706 
707  mb_num++;
709  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
710  s->first_slice_line = 0;
711 
712  if (s->pict_type == AV_PICTURE_TYPE_I) {
713  int i;
714 
715  do {
716  if (show_bits(&s->gb, 19) == DC_MARKER)
717  return mb_num - 1;
718 
720  if (cbpc < 0) {
722  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
723  return AVERROR_INVALIDDATA;
724  }
725  } while (cbpc == 8);
726 
727  s->cbp_table[xy] = cbpc & 3;
729  s->mb_intra = 1;
730 
731  if (cbpc & 4)
732  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
733 
734  s->current_picture.qscale_table[xy] = s->qscale;
735 
736  s->mbintra_table[xy] = 1;
737  for (i = 0; i < 6; i++) {
738  int dc_pred_dir;
739  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
740  if (dc < 0) {
742  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
743  return dc;
744  }
745  dir <<= 1;
746  if (dc_pred_dir)
747  dir |= 1;
748  }
749  s->pred_dir_table[xy] = dir;
750  } else { /* P/S_TYPE */
751  int mx, my, pred_x, pred_y, bits;
752  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
753  const int stride = s->b8_stride * 2;
754 
755 try_again:
756  bits = show_bits(&s->gb, 17);
757  if (bits == MOTION_MARKER)
758  return mb_num - 1;
759 
760  skip_bits1(&s->gb);
761  if (bits & 0x10000) {
762  /* skip mb */
763  if (s->pict_type == AV_PICTURE_TYPE_S &&
764  ctx->vol_sprite_usage == GMC_SPRITE) {
766  MB_TYPE_16x16 |
767  MB_TYPE_GMC |
768  MB_TYPE_L0;
769  mx = get_amv(ctx, 0);
770  my = get_amv(ctx, 1);
771  } else {
773  MB_TYPE_16x16 |
774  MB_TYPE_L0;
775  mx = my = 0;
776  }
777  mot_val[0] =
778  mot_val[2] =
779  mot_val[0 + stride] =
780  mot_val[2 + stride] = mx;
781  mot_val[1] =
782  mot_val[3] =
783  mot_val[1 + stride] =
784  mot_val[3 + stride] = my;
785 
786  if (s->mbintra_table[xy])
788  continue;
789  }
790 
792  if (cbpc < 0) {
794  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
795  return AVERROR_INVALIDDATA;
796  }
797  if (cbpc == 20)
798  goto try_again;
799 
800  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
801 
802  s->mb_intra = ((cbpc & 4) != 0);
803 
804  if (s->mb_intra) {
806  s->mbintra_table[xy] = 1;
807  mot_val[0] =
808  mot_val[2] =
809  mot_val[0 + stride] =
810  mot_val[2 + stride] = 0;
811  mot_val[1] =
812  mot_val[3] =
813  mot_val[1 + stride] =
814  mot_val[3 + stride] = 0;
815  } else {
816  if (s->mbintra_table[xy])
818 
819  if (s->pict_type == AV_PICTURE_TYPE_S &&
820  ctx->vol_sprite_usage == GMC_SPRITE &&
821  (cbpc & 16) == 0)
822  s->mcsel = get_bits1(&s->gb);
823  else
824  s->mcsel = 0;
825 
826  if ((cbpc & 16) == 0) {
827  /* 16x16 motion prediction */
828 
829  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
830  if (!s->mcsel) {
831  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
832  if (mx >= 0xffff)
833  return AVERROR_INVALIDDATA;
834 
835  my = ff_h263_decode_motion(s, pred_y, s->f_code);
836  if (my >= 0xffff)
837  return AVERROR_INVALIDDATA;
839  MB_TYPE_L0;
840  } else {
841  mx = get_amv(ctx, 0);
842  my = get_amv(ctx, 1);
844  MB_TYPE_GMC |
845  MB_TYPE_L0;
846  }
847 
848  mot_val[0] =
849  mot_val[2] =
850  mot_val[0 + stride] =
851  mot_val[2 + stride] = mx;
852  mot_val[1] =
853  mot_val[3] =
854  mot_val[1 + stride] =
855  mot_val[3 + stride] = my;
856  } else {
857  int i;
859  MB_TYPE_L0;
860  for (i = 0; i < 4; i++) {
861  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
862  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
863  if (mx >= 0xffff)
864  return AVERROR_INVALIDDATA;
865 
866  my = ff_h263_decode_motion(s, pred_y, s->f_code);
867  if (my >= 0xffff)
868  return AVERROR_INVALIDDATA;
869  mot_val[0] = mx;
870  mot_val[1] = my;
871  }
872  }
873  }
874  }
875  }
876  s->mb_x = 0;
877  }
878 
879  return mb_num;
880 }
881 
882 /**
883  * decode second partition.
884  * @return <0 if an error occurred
885  */
886 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
887 {
888  int mb_num = 0;
889  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
890 
891  s->mb_x = s->resync_mb_x;
892  s->first_slice_line = 1;
893  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
895  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
896  const int xy = s->mb_x + s->mb_y * s->mb_stride;
897 
898  mb_num++;
900  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
901  s->first_slice_line = 0;
902 
903  if (s->pict_type == AV_PICTURE_TYPE_I) {
904  int ac_pred = get_bits1(&s->gb);
905  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
906  if (cbpy < 0) {
908  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
909  return AVERROR_INVALIDDATA;
910  }
911 
912  s->cbp_table[xy] |= cbpy << 2;
913  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
914  } else { /* P || S_TYPE */
915  if (IS_INTRA(s->current_picture.mb_type[xy])) {
916  int i;
917  int dir = 0;
918  int ac_pred = get_bits1(&s->gb);
919  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
920 
921  if (cbpy < 0) {
923  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
924  return AVERROR_INVALIDDATA;
925  }
926 
927  if (s->cbp_table[xy] & 8)
928  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
929  s->current_picture.qscale_table[xy] = s->qscale;
930 
931  for (i = 0; i < 6; i++) {
932  int dc_pred_dir;
933  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
934  if (dc < 0) {
936  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
937  return dc;
938  }
939  dir <<= 1;
940  if (dc_pred_dir)
941  dir |= 1;
942  }
943  s->cbp_table[xy] &= 3; // remove dquant
944  s->cbp_table[xy] |= cbpy << 2;
945  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
946  s->pred_dir_table[xy] = dir;
947  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
948  s->current_picture.qscale_table[xy] = s->qscale;
949  s->cbp_table[xy] = 0;
950  } else {
951  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
952 
953  if (cbpy < 0) {
955  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
956  return AVERROR_INVALIDDATA;
957  }
958 
959  if (s->cbp_table[xy] & 8)
960  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
961  s->current_picture.qscale_table[xy] = s->qscale;
962 
963  s->cbp_table[xy] &= 3; // remove dquant
964  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
965  }
966  }
967  }
968  if (mb_num >= mb_count)
969  return 0;
970  s->mb_x = 0;
971  }
972  return 0;
973 }
974 
975 /**
976  * Decode the first and second partition.
977  * @return <0 if error (and sets error type in the error_status_table)
978  */
980 {
981  MpegEncContext *s = &ctx->m;
982  int mb_num;
983  int ret;
984  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
985  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
986 
987  mb_num = mpeg4_decode_partition_a(ctx);
988  if (mb_num <= 0) {
990  s->mb_x, s->mb_y, part_a_error);
991  return mb_num ? mb_num : AVERROR_INVALIDDATA;
992  }
993 
994  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
995  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
997  s->mb_x, s->mb_y, part_a_error);
998  return AVERROR_INVALIDDATA;
999  }
1000 
1001  s->mb_num_left = mb_num;
1002 
1003  if (s->pict_type == AV_PICTURE_TYPE_I) {
1004  while (show_bits(&s->gb, 9) == 1)
1005  skip_bits(&s->gb, 9);
1006  if (get_bits(&s->gb, 19) != DC_MARKER) {
1008  "marker missing after first I partition at %d %d\n",
1009  s->mb_x, s->mb_y);
1010  return AVERROR_INVALIDDATA;
1011  }
1012  } else {
1013  while (show_bits(&s->gb, 10) == 1)
1014  skip_bits(&s->gb, 10);
1015  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
1017  "marker missing after first P partition at %d %d\n",
1018  s->mb_x, s->mb_y);
1019  return AVERROR_INVALIDDATA;
1020  }
1021  }
1023  s->mb_x - 1, s->mb_y, part_a_end);
1024 
1025  ret = mpeg4_decode_partition_b(s, mb_num);
1026  if (ret < 0) {
1027  if (s->pict_type == AV_PICTURE_TYPE_P)
1029  s->mb_x, s->mb_y, ER_DC_ERROR);
1030  return ret;
1031  } else {
1032  if (s->pict_type == AV_PICTURE_TYPE_P)
1034  s->mb_x - 1, s->mb_y, ER_DC_END);
1035  }
1036 
1037  return 0;
1038 }
1039 
1040 /**
1041  * Decode a block.
1042  * @return <0 if an error occurred
1043  */
1044 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
1045  int n, int coded, int intra, int rvlc)
1046 {
1047  MpegEncContext *s = &ctx->m;
1048  int level, i, last, run, qmul, qadd;
1049  int av_uninit(dc_pred_dir);
1050  RLTable *rl;
1051  RL_VLC_ELEM *rl_vlc;
1052  const uint8_t *scan_table;
1053 
1054  // Note intra & rvlc should be optimized away if this is inlined
1055 
1056  if (intra) {
1057  if (ctx->use_intra_dc_vlc) {
1058  /* DC coef */
1059  if (s->partitioned_frame) {
1060  level = s->dc_val[0][s->block_index[n]];
1061  if (n < 4)
1062  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1063  else
1064  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1065  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1066  } else {
1067  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1068  if (level < 0)
1069  return level;
1070  }
1071  block[0] = level;
1072  i = 0;
1073  } else {
1074  i = -1;
1075  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1076  }
1077  if (!coded)
1078  goto not_coded;
1079 
1080  if (rvlc) {
1081  rl = &ff_rvlc_rl_intra;
1082  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1083  } else {
1084  rl = &ff_mpeg4_rl_intra;
1085  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1086  }
1087  if (s->ac_pred) {
1088  if (dc_pred_dir == 0)
1089  scan_table = s->intra_v_scantable.permutated; /* left */
1090  else
1091  scan_table = s->intra_h_scantable.permutated; /* top */
1092  } else {
1093  scan_table = s->intra_scantable.permutated;
1094  }
1095  qmul = 1;
1096  qadd = 0;
1097  } else {
1098  i = -1;
1099  if (!coded) {
1100  s->block_last_index[n] = i;
1101  return 0;
1102  }
1103  if (rvlc)
1104  rl = &ff_rvlc_rl_inter;
1105  else
1106  rl = &ff_h263_rl_inter;
1107 
1108  scan_table = s->intra_scantable.permutated;
1109 
1110  if (s->mpeg_quant) {
1111  qmul = 1;
1112  qadd = 0;
1113  if (rvlc)
1114  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1115  else
1116  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1117  } else {
1118  qmul = s->qscale << 1;
1119  qadd = (s->qscale - 1) | 1;
1120  if (rvlc)
1121  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1122  else
1123  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1124  }
1125  }
1126  {
1127  OPEN_READER(re, &s->gb);
1128  for (;;) {
1129  UPDATE_CACHE(re, &s->gb);
1130  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1131  if (level == 0) {
1132  /* escape */
1133  if (rvlc) {
1134  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1136  "1. marker bit missing in rvlc esc\n");
1137  return AVERROR_INVALIDDATA;
1138  }
1139  SKIP_CACHE(re, &s->gb, 1);
1140 
1141  last = SHOW_UBITS(re, &s->gb, 1);
1142  SKIP_CACHE(re, &s->gb, 1);
1143  run = SHOW_UBITS(re, &s->gb, 6);
1144  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1145  UPDATE_CACHE(re, &s->gb);
1146 
1147  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1149  "2. marker bit missing in rvlc esc\n");
1150  return AVERROR_INVALIDDATA;
1151  }
1152  SKIP_CACHE(re, &s->gb, 1);
1153 
1154  level = SHOW_UBITS(re, &s->gb, 11);
1155  SKIP_CACHE(re, &s->gb, 11);
1156 
1157  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1158  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1159  return AVERROR_INVALIDDATA;
1160  }
1161  SKIP_CACHE(re, &s->gb, 5);
1162 
1163  level = level * qmul + qadd;
1164  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1165  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1166 
1167  i += run + 1;
1168  if (last)
1169  i += 192;
1170  } else {
1171  int cache;
1172  cache = GET_CACHE(re, &s->gb);
1173 
1174  if (IS_3IV1)
1175  cache ^= 0xC0000000;
1176 
1177  if (cache & 0x80000000) {
1178  if (cache & 0x40000000) {
1179  /* third escape */
1180  SKIP_CACHE(re, &s->gb, 2);
1181  last = SHOW_UBITS(re, &s->gb, 1);
1182  SKIP_CACHE(re, &s->gb, 1);
1183  run = SHOW_UBITS(re, &s->gb, 6);
1184  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1185  UPDATE_CACHE(re, &s->gb);
1186 
1187  if (IS_3IV1) {
1188  level = SHOW_SBITS(re, &s->gb, 12);
1189  LAST_SKIP_BITS(re, &s->gb, 12);
1190  } else {
1191  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1193  "1. marker bit missing in 3. esc\n");
1194  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR) || get_bits_left(&s->gb) <= 0)
1195  return AVERROR_INVALIDDATA;
1196  }
1197  SKIP_CACHE(re, &s->gb, 1);
1198 
1199  level = SHOW_SBITS(re, &s->gb, 12);
1200  SKIP_CACHE(re, &s->gb, 12);
1201 
1202  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1204  "2. marker bit missing in 3. esc\n");
1205  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR) || get_bits_left(&s->gb) <= 0)
1206  return AVERROR_INVALIDDATA;
1207  }
1208 
1209  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1210  }
1211 
1212 #if 0
1213  if (s->error_recognition >= FF_ER_COMPLIANT) {
1214  const int abs_level= FFABS(level);
1215  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1216  const int run1= run - rl->max_run[last][abs_level] - 1;
1217  if (abs_level <= rl->max_level[last][run]) {
1218  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1219  return AVERROR_INVALIDDATA;
1220  }
1221  if (s->error_recognition > FF_ER_COMPLIANT) {
1222  if (abs_level <= rl->max_level[last][run]*2) {
1223  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1224  return AVERROR_INVALIDDATA;
1225  }
1226  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1227  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1228  return AVERROR_INVALIDDATA;
1229  }
1230  }
1231  }
1232  }
1233 #endif
1234  if (level > 0)
1235  level = level * qmul + qadd;
1236  else
1237  level = level * qmul - qadd;
1238 
1239  if ((unsigned)(level + 2048) > 4095) {
1241  if (level > 2560 || level < -2560) {
1243  "|level| overflow in 3. esc, qp=%d\n",
1244  s->qscale);
1245  return AVERROR_INVALIDDATA;
1246  }
1247  }
1248  level = level < 0 ? -2048 : 2047;
1249  }
1250 
1251  i += run + 1;
1252  if (last)
1253  i += 192;
1254  } else {
1255  /* second escape */
1256  SKIP_BITS(re, &s->gb, 2);
1257  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1258  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1259  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1260  LAST_SKIP_BITS(re, &s->gb, 1);
1261  }
1262  } else {
1263  /* first escape */
1264  SKIP_BITS(re, &s->gb, 1);
1265  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1266  i += run;
1267  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1268  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1269  LAST_SKIP_BITS(re, &s->gb, 1);
1270  }
1271  }
1272  } else {
1273  i += run;
1274  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1275  LAST_SKIP_BITS(re, &s->gb, 1);
1276  }
1277  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1278  if (i > 62) {
1279  i -= 192;
1280  if (i & (~63)) {
1282  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1283  return AVERROR_INVALIDDATA;
1284  }
1285 
1286  block[scan_table[i]] = level;
1287  break;
1288  }
1289 
1290  block[scan_table[i]] = level;
1291  }
1292  CLOSE_READER(re, &s->gb);
1293  }
1294 
1295 not_coded:
1296  if (intra) {
1297  if (!ctx->use_intra_dc_vlc) {
1298  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1299 
1300  i -= i >> 31; // if (i == -1) i = 0;
1301  }
1302 
1303  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1304  if (s->ac_pred)
1305  i = 63; // FIXME not optimal
1306  }
1307  s->block_last_index[n] = i;
1308  return 0;
1309 }
1310 
1311 /**
1312  * decode partition C of one MB.
1313  * @return <0 if an error occurred
1314  */
1316 {
1318  int cbp, mb_type;
1319  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1320 
1321  av_assert2(s == (void*)ctx);
1322 
1323  mb_type = s->current_picture.mb_type[xy];
1324  cbp = s->cbp_table[xy];
1325 
1326  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1327 
1328  if (s->current_picture.qscale_table[xy] != s->qscale)
1330 
1331  if (s->pict_type == AV_PICTURE_TYPE_P ||
1332  s->pict_type == AV_PICTURE_TYPE_S) {
1333  int i;
1334  for (i = 0; i < 4; i++) {
1335  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1336  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1337  }
1338  s->mb_intra = IS_INTRA(mb_type);
1339 
1340  if (IS_SKIP(mb_type)) {
1341  /* skip mb */
1342  for (i = 0; i < 6; i++)
1343  s->block_last_index[i] = -1;
1344  s->mv_dir = MV_DIR_FORWARD;
1345  s->mv_type = MV_TYPE_16X16;
1347  && ctx->vol_sprite_usage == GMC_SPRITE) {
1348  s->mcsel = 1;
1349  s->mb_skipped = 0;
1350  } else {
1351  s->mcsel = 0;
1352  s->mb_skipped = 1;
1353  }
1354  } else if (s->mb_intra) {
1356  } else if (!s->mb_intra) {
1357  // s->mcsel = 0; // FIXME do we need to init that?
1358 
1359  s->mv_dir = MV_DIR_FORWARD;
1360  if (IS_8X8(mb_type)) {
1361  s->mv_type = MV_TYPE_8X8;
1362  } else {
1363  s->mv_type = MV_TYPE_16X16;
1364  }
1365  }
1366  } else { /* I-Frame */
1367  s->mb_intra = 1;
1369  }
1370 
1371  if (!IS_SKIP(mb_type)) {
1372  int i;
1373  s->bdsp.clear_blocks(s->block[0]);
1374  /* decode each block */
1375  for (i = 0; i < 6; i++) {
1376  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1378  "texture corrupted at %d %d %d\n",
1379  s->mb_x, s->mb_y, s->mb_intra);
1380  return AVERROR_INVALIDDATA;
1381  }
1382  cbp += cbp;
1383  }
1384  }
1385 
1386  /* per-MB end of slice check */
1387  if (--s->mb_num_left <= 0) {
1388  if (mpeg4_is_resync(ctx))
1389  return SLICE_END;
1390  else
1391  return SLICE_NOEND;
1392  } else {
1393  if (mpeg4_is_resync(ctx)) {
1394  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1395  if (s->cbp_table[xy + delta])
1396  return SLICE_END;
1397  }
1398  return SLICE_OK;
1399  }
1400 }
1401 
1402 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1403 {
1405  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1406  int16_t *mot_val;
1407  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1408  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1409 
1410  av_assert2(s == (void*)ctx);
1411  av_assert2(s->h263_pred);
1412 
1413  if (s->pict_type == AV_PICTURE_TYPE_P ||
1414  s->pict_type == AV_PICTURE_TYPE_S) {
1415  do {
1416  if (get_bits1(&s->gb)) {
1417  /* skip mb */
1418  s->mb_intra = 0;
1419  for (i = 0; i < 6; i++)
1420  s->block_last_index[i] = -1;
1421  s->mv_dir = MV_DIR_FORWARD;
1422  s->mv_type = MV_TYPE_16X16;
1423  if (s->pict_type == AV_PICTURE_TYPE_S &&
1424  ctx->vol_sprite_usage == GMC_SPRITE) {
1426  MB_TYPE_GMC |
1427  MB_TYPE_16x16 |
1428  MB_TYPE_L0;
1429  s->mcsel = 1;
1430  s->mv[0][0][0] = get_amv(ctx, 0);
1431  s->mv[0][0][1] = get_amv(ctx, 1);
1432  s->mb_skipped = 0;
1433  } else {
1435  MB_TYPE_16x16 |
1436  MB_TYPE_L0;
1437  s->mcsel = 0;
1438  s->mv[0][0][0] = 0;
1439  s->mv[0][0][1] = 0;
1440  s->mb_skipped = 1;
1441  }
1442  goto end;
1443  }
1445  if (cbpc < 0) {
1447  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1448  return AVERROR_INVALIDDATA;
1449  }
1450  } while (cbpc == 20);
1451 
1452  s->bdsp.clear_blocks(s->block[0]);
1453  dquant = cbpc & 8;
1454  s->mb_intra = ((cbpc & 4) != 0);
1455  if (s->mb_intra)
1456  goto intra;
1457 
1458  if (s->pict_type == AV_PICTURE_TYPE_S &&
1459  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1460  s->mcsel = get_bits1(&s->gb);
1461  else
1462  s->mcsel = 0;
1463  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1464  if (cbpy < 0) {
1466  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1467  return AVERROR_INVALIDDATA;
1468  }
1469 
1470  cbp = (cbpc & 3) | (cbpy << 2);
1471  if (dquant)
1472  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1473  if ((!s->progressive_sequence) &&
1474  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1475  s->interlaced_dct = get_bits1(&s->gb);
1476 
1477  s->mv_dir = MV_DIR_FORWARD;
1478  if ((cbpc & 16) == 0) {
1479  if (s->mcsel) {
1481  MB_TYPE_16x16 |
1482  MB_TYPE_L0;
1483  /* 16x16 global motion prediction */
1484  s->mv_type = MV_TYPE_16X16;
1485  mx = get_amv(ctx, 0);
1486  my = get_amv(ctx, 1);
1487  s->mv[0][0][0] = mx;
1488  s->mv[0][0][1] = my;
1489  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1491  MB_TYPE_L0 |
1493  /* 16x8 field motion prediction */
1494  s->mv_type = MV_TYPE_FIELD;
1495 
1496  s->field_select[0][0] = get_bits1(&s->gb);
1497  s->field_select[0][1] = get_bits1(&s->gb);
1498 
1499  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1500 
1501  for (i = 0; i < 2; i++) {
1502  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1503  if (mx >= 0xffff)
1504  return AVERROR_INVALIDDATA;
1505 
1506  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1507  if (my >= 0xffff)
1508  return AVERROR_INVALIDDATA;
1509 
1510  s->mv[0][i][0] = mx;
1511  s->mv[0][i][1] = my;
1512  }
1513  } else {
1515  /* 16x16 motion prediction */
1516  s->mv_type = MV_TYPE_16X16;
1517  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1518  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1519 
1520  if (mx >= 0xffff)
1521  return AVERROR_INVALIDDATA;
1522 
1523  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1524 
1525  if (my >= 0xffff)
1526  return AVERROR_INVALIDDATA;
1527  s->mv[0][0][0] = mx;
1528  s->mv[0][0][1] = my;
1529  }
1530  } else {
1532  s->mv_type = MV_TYPE_8X8;
1533  for (i = 0; i < 4; i++) {
1534  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1535  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1536  if (mx >= 0xffff)
1537  return AVERROR_INVALIDDATA;
1538 
1539  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1540  if (my >= 0xffff)
1541  return AVERROR_INVALIDDATA;
1542  s->mv[0][i][0] = mx;
1543  s->mv[0][i][1] = my;
1544  mot_val[0] = mx;
1545  mot_val[1] = my;
1546  }
1547  }
1548  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1549  int modb1; // first bit of modb
1550  int modb2; // second bit of modb
1551  int mb_type;
1552 
1553  s->mb_intra = 0; // B-frames never contain intra blocks
1554  s->mcsel = 0; // ... true gmc blocks
1555 
1556  if (s->mb_x == 0) {
1557  for (i = 0; i < 2; i++) {
1558  s->last_mv[i][0][0] =
1559  s->last_mv[i][0][1] =
1560  s->last_mv[i][1][0] =
1561  s->last_mv[i][1][1] = 0;
1562  }
1563 
1565  }
1566 
1567  /* if we skipped it in the future P-frame than skip it now too */
1568  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1569 
1570  if (s->mb_skipped) {
1571  /* skip mb */
1572  for (i = 0; i < 6; i++)
1573  s->block_last_index[i] = -1;
1574 
1575  s->mv_dir = MV_DIR_FORWARD;
1576  s->mv_type = MV_TYPE_16X16;
1577  s->mv[0][0][0] =
1578  s->mv[0][0][1] =
1579  s->mv[1][0][0] =
1580  s->mv[1][0][1] = 0;
1582  MB_TYPE_16x16 |
1583  MB_TYPE_L0;
1584  goto end;
1585  }
1586 
1587  modb1 = get_bits1(&s->gb);
1588  if (modb1) {
1589  // like MB_TYPE_B_DIRECT but no vectors coded
1591  cbp = 0;
1592  } else {
1593  modb2 = get_bits1(&s->gb);
1594  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1595  if (mb_type < 0) {
1596  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1597  return AVERROR_INVALIDDATA;
1598  }
1599  mb_type = mb_type_b_map[mb_type];
1600  if (modb2) {
1601  cbp = 0;
1602  } else {
1603  s->bdsp.clear_blocks(s->block[0]);
1604  cbp = get_bits(&s->gb, 6);
1605  }
1606 
1607  if ((!IS_DIRECT(mb_type)) && cbp) {
1608  if (get_bits1(&s->gb))
1609  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1610  }
1611 
1612  if (!s->progressive_sequence) {
1613  if (cbp)
1614  s->interlaced_dct = get_bits1(&s->gb);
1615 
1616  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1617  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1618  mb_type &= ~MB_TYPE_16x16;
1619 
1620  if (USES_LIST(mb_type, 0)) {
1621  s->field_select[0][0] = get_bits1(&s->gb);
1622  s->field_select[0][1] = get_bits1(&s->gb);
1623  }
1624  if (USES_LIST(mb_type, 1)) {
1625  s->field_select[1][0] = get_bits1(&s->gb);
1626  s->field_select[1][1] = get_bits1(&s->gb);
1627  }
1628  }
1629  }
1630 
1631  s->mv_dir = 0;
1632  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1633  s->mv_type = MV_TYPE_16X16;
1634 
1635  if (USES_LIST(mb_type, 0)) {
1636  s->mv_dir = MV_DIR_FORWARD;
1637 
1638  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1639  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1640  s->last_mv[0][1][0] =
1641  s->last_mv[0][0][0] =
1642  s->mv[0][0][0] = mx;
1643  s->last_mv[0][1][1] =
1644  s->last_mv[0][0][1] =
1645  s->mv[0][0][1] = my;
1646  }
1647 
1648  if (USES_LIST(mb_type, 1)) {
1649  s->mv_dir |= MV_DIR_BACKWARD;
1650 
1651  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1652  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1653  s->last_mv[1][1][0] =
1654  s->last_mv[1][0][0] =
1655  s->mv[1][0][0] = mx;
1656  s->last_mv[1][1][1] =
1657  s->last_mv[1][0][1] =
1658  s->mv[1][0][1] = my;
1659  }
1660  } else if (!IS_DIRECT(mb_type)) {
1661  s->mv_type = MV_TYPE_FIELD;
1662 
1663  if (USES_LIST(mb_type, 0)) {
1664  s->mv_dir = MV_DIR_FORWARD;
1665 
1666  for (i = 0; i < 2; i++) {
1667  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1668  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1669  s->last_mv[0][i][0] =
1670  s->mv[0][i][0] = mx;
1671  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1672  }
1673  }
1674 
1675  if (USES_LIST(mb_type, 1)) {
1676  s->mv_dir |= MV_DIR_BACKWARD;
1677 
1678  for (i = 0; i < 2; i++) {
1679  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1680  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1681  s->last_mv[1][i][0] =
1682  s->mv[1][i][0] = mx;
1683  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1684  }
1685  }
1686  }
1687  }
1688 
1689  if (IS_DIRECT(mb_type)) {
1690  if (IS_SKIP(mb_type)) {
1691  mx =
1692  my = 0;
1693  } else {
1694  mx = ff_h263_decode_motion(s, 0, 1);
1695  my = ff_h263_decode_motion(s, 0, 1);
1696  }
1697 
1699  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1700  }
1701  s->current_picture.mb_type[xy] = mb_type;
1702  } else { /* I-Frame */
1703  do {
1705  if (cbpc < 0) {
1707  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1708  return AVERROR_INVALIDDATA;
1709  }
1710  } while (cbpc == 8);
1711 
1712  dquant = cbpc & 4;
1713  s->mb_intra = 1;
1714 
1715 intra:
1716  s->ac_pred = get_bits1(&s->gb);
1717  if (s->ac_pred)
1719  else
1721 
1722  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1723  if (cbpy < 0) {
1725  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1726  return AVERROR_INVALIDDATA;
1727  }
1728  cbp = (cbpc & 3) | (cbpy << 2);
1729 
1730  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1731 
1732  if (dquant)
1733  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1734 
1735  if (!s->progressive_sequence)
1736  s->interlaced_dct = get_bits1(&s->gb);
1737 
1738  s->bdsp.clear_blocks(s->block[0]);
1739  /* decode each block */
1740  for (i = 0; i < 6; i++) {
1741  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1742  return AVERROR_INVALIDDATA;
1743  cbp += cbp;
1744  }
1745  goto end;
1746  }
1747 
1748  /* decode each block */
1749  for (i = 0; i < 6; i++) {
1750  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1751  return AVERROR_INVALIDDATA;
1752  cbp += cbp;
1753  }
1754 
1755 end:
1756  /* per-MB end of slice check */
1757  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1758  int next = mpeg4_is_resync(ctx);
1759  if (next) {
1760  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1761  return AVERROR_INVALIDDATA;
1762  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1763  return SLICE_END;
1764 
1765  if (s->pict_type == AV_PICTURE_TYPE_B) {
1766  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1768  (s->mb_x + delta >= s->mb_width)
1769  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1770  : s->mb_y, 0);
1771  if (s->next_picture.mbskip_table[xy + delta])
1772  return SLICE_OK;
1773  }
1774 
1775  return SLICE_END;
1776  }
1777  }
1778 
1779  return SLICE_OK;
1780 }
1781 
1782 /* As per spec, studio start code search isn't the same as the old type of start code */
1784 {
1785  align_get_bits(gb);
1786 
1787  while (get_bits_left(gb) >= 24 && show_bits(gb, 24) != 0x1) {
1788  get_bits(gb, 8);
1789  }
1790 }
1791 
1792 /* additional_code, vlc index */
1793 static const uint8_t ac_state_tab[22][2] =
1794 {
1795  {0, 0},
1796  {0, 1},
1797  {1, 1},
1798  {2, 1},
1799  {3, 1},
1800  {4, 1},
1801  {5, 1},
1802  {1, 2},
1803  {2, 2},
1804  {3, 2},
1805  {4, 2},
1806  {5, 2},
1807  {6, 2},
1808  {1, 3},
1809  {2, 4},
1810  {3, 5},
1811  {4, 6},
1812  {5, 7},
1813  {6, 8},
1814  {7, 9},
1815  {8, 10},
1816  {0, 11}
1817 };
1818 
1820 {
1822 
1823  int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
1824  additional_code_len, sign, mismatch;
1825  VLC *cur_vlc = &ctx->studio_intra_tab[0];
1826  uint8_t *const scantable = s->intra_scantable.permutated;
1827  const uint16_t *quant_matrix;
1828  uint32_t flc;
1829  const int min = -1 * (1 << (s->avctx->bits_per_raw_sample + 6));
1830  const int max = ((1 << (s->avctx->bits_per_raw_sample + 6)) - 1);
1831  int shift = 3 - s->dct_precision;
1832 
1833  mismatch = 1;
1834 
1835  memset(block, 0, 64 * sizeof(int32_t));
1836 
1837  if (n < 4) {
1838  cc = 0;
1839  dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1840  quant_matrix = s->intra_matrix;
1841  } else {
1842  cc = (n & 1) + 1;
1843  if (ctx->rgb)
1844  dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1845  else
1846  dct_dc_size = get_vlc2(&s->gb, ctx->studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
1847  quant_matrix = s->chroma_intra_matrix;
1848  }
1849 
1850  if (dct_dc_size < 0) {
1851  av_log(s->avctx, AV_LOG_ERROR, "illegal dct_dc_size vlc\n");
1852  return AVERROR_INVALIDDATA;
1853  } else if (dct_dc_size == 0) {
1854  dct_diff = 0;
1855  } else {
1856  dct_diff = get_xbits(&s->gb, dct_dc_size);
1857 
1858  if (dct_dc_size > 8) {
1859  if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
1860  return AVERROR_INVALIDDATA;
1861  }
1862 
1863  }
1864 
1865  s->last_dc[cc] += dct_diff;
1866 
1867  if (s->mpeg_quant)
1868  block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
1869  else
1870  block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
1871  /* TODO: support mpeg_quant for AC coefficients */
1872 
1873  block[0] = av_clip(block[0], min, max);
1874  mismatch ^= block[0];
1875 
1876  /* AC Coefficients */
1877  while (1) {
1878  group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);
1879 
1880  if (group < 0) {
1881  av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
1882  return AVERROR_INVALIDDATA;
1883  }
1884 
1885  additional_code_len = ac_state_tab[group][0];
1886  cur_vlc = &ctx->studio_intra_tab[ac_state_tab[group][1]];
1887 
1888  if (group == 0) {
1889  /* End of Block */
1890  break;
1891  } else if (group >= 1 && group <= 6) {
1892  /* Zero run length (Table B.47) */
1893  run = 1 << additional_code_len;
1894  if (additional_code_len)
1895  run += get_bits(&s->gb, additional_code_len);
1896  idx += run;
1897  continue;
1898  } else if (group >= 7 && group <= 12) {
1899  /* Zero run length and +/-1 level (Table B.48) */
1900  code = get_bits(&s->gb, additional_code_len);
1901  sign = code & 1;
1902  code >>= 1;
1903  run = (1 << (additional_code_len - 1)) + code;
1904  idx += run;
1905  if (idx > 63)
1906  return AVERROR_INVALIDDATA;
1907  j = scantable[idx++];
1908  block[j] = sign ? 1 : -1;
1909  } else if (group >= 13 && group <= 20) {
1910  /* Level value (Table B.49) */
1911  if (idx > 63)
1912  return AVERROR_INVALIDDATA;
1913  j = scantable[idx++];
1914  block[j] = get_xbits(&s->gb, additional_code_len);
1915  } else if (group == 21) {
1916  /* Escape */
1917  if (idx > 63)
1918  return AVERROR_INVALIDDATA;
1919  j = scantable[idx++];
1920  additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
1921  flc = get_bits(&s->gb, additional_code_len);
1922  if (flc >> (additional_code_len-1))
1923  block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
1924  else
1925  block[j] = flc;
1926  }
1927  block[j] = ((block[j] * quant_matrix[j] * s->qscale) * (1 << shift)) / 16;
1928  block[j] = av_clip(block[j], min, max);
1929  mismatch ^= block[j];
1930  }
1931 
1932  block[63] ^= mismatch & 1;
1933 
1934  return 0;
1935 }
1936 
1937 static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
1938 {
1939  int i, j, w, h, idx = 0;
1940  int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
1941  dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
1942  h = 16 >> (n ? s->chroma_y_shift : 0);
1943  w = 16 >> (n ? s->chroma_x_shift : 0);
1944 
1945  block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1946  if (block_mean == 0){
1947  av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
1948  return AVERROR_INVALIDDATA;
1949  }
1950  s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));
1951 
1952  rice_parameter = get_bits(&s->gb, 4);
1953  if (rice_parameter == 0) {
1954  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1955  return AVERROR_INVALIDDATA;
1956  }
1957 
1958  if (rice_parameter == 15)
1959  rice_parameter = 0;
1960 
1961  if (rice_parameter > 11) {
1962  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1963  return AVERROR_INVALIDDATA;
1964  }
1965 
1966  for (i = 0; i < h; i++) {
1967  output = 1 << (s->avctx->bits_per_raw_sample - 1);
1968  top = 1 << (s->avctx->bits_per_raw_sample - 1);
1969 
1970  for (j = 0; j < w; j++) {
1971  left = output;
1972  topleft = top;
1973 
1974  rice_prefix_code = get_unary(&s->gb, 1, 12);
1975 
1976  /* Escape */
1977  if (rice_prefix_code == 11)
1978  dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1979  else {
1980  if (rice_prefix_code == 12) {
1981  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
1982  return AVERROR_INVALIDDATA;
1983  }
1984  rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
1985  dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
1986  }
1987 
1988  /* Map to a signed residual */
1989  if (dpcm_residual & 1)
1990  dpcm_residual = (-1 * dpcm_residual) >> 1;
1991  else
1992  dpcm_residual = (dpcm_residual >> 1);
1993 
1994  if (i != 0)
1995  top = macroblock[idx-w];
1996 
1997  p = left + top - topleft;
1998  min_left_top = FFMIN(left, top);
1999  if (p < min_left_top)
2000  p = min_left_top;
2001 
2002  max_left_top = FFMAX(left, top);
2003  if (p > max_left_top)
2004  p = max_left_top;
2005 
2006  p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
2007  if (p2 == p)
2008  p2 = block_mean;
2009 
2010  if (p2 > p)
2011  dpcm_residual *= -1;
2012 
2013  macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
2014  }
2015  }
2016 
2017  return 0;
2018 }
2019 
2020 static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
2021 {
2022  int i;
2023 
2024  s->dpcm_direction = 0;
2025 
2026  /* StudioMacroblock */
2027  /* Assumes I-VOP */
2028  s->mb_intra = 1;
2029  if (get_bits1(&s->gb)) { /* compression_mode */
2030  /* DCT */
2031  /* macroblock_type, 1 or 2-bit VLC */
2032  if (!get_bits1(&s->gb)) {
2033  skip_bits1(&s->gb);
2034  s->qscale = mpeg_get_qscale(s);
2035  }
2036 
2037  for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
2038  if (mpeg4_decode_studio_block(s, (*s->block32)[i], i) < 0)
2039  return AVERROR_INVALIDDATA;
2040  }
2041  } else {
2042  /* DPCM */
2043  check_marker(s->avctx, &s->gb, "DPCM block start");
2044  s->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
2045  for (i = 0; i < 3; i++) {
2046  if (mpeg4_decode_dpcm_macroblock(s, (*s->dpcm_macroblock)[i], i) < 0)
2047  return AVERROR_INVALIDDATA;
2048  }
2049  }
2050 
2051  if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
2053  return SLICE_END;
2054  }
2055 
2056  //vcon-stp9L1.bits (first frame)
2057  if (get_bits_left(&s->gb) == 0)
2058  return SLICE_END;
2059 
2060  //vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
2061  if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
2062  return SLICE_END;
2063 
2064  return SLICE_OK;
2065 }
2066 
2068 {
2069  int hours, minutes, seconds;
2070 
2071  if (!show_bits(gb, 23)) {
2072  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
2073  return AVERROR_INVALIDDATA;
2074  }
2075 
2076  hours = get_bits(gb, 5);
2077  minutes = get_bits(gb, 6);
2078  check_marker(s->avctx, gb, "in gop_header");
2079  seconds = get_bits(gb, 6);
2080 
2081  s->time_base = seconds + 60*(minutes + 60*hours);
2082 
2083  skip_bits1(gb);
2084  skip_bits1(gb);
2085 
2086  return 0;
2087 }
2088 
2090 {
2091 
2092  *profile = get_bits(gb, 4);
2093  *level = get_bits(gb, 4);
2094 
2095  // for Simple profile, level 0
2096  if (*profile == 0 && *level == 8) {
2097  *level = 0;
2098  }
2099 
2100  return 0;
2101 }
2102 
2104 {
2105  int visual_object_type;
2106  int is_visual_object_identifier = get_bits1(gb);
2107 
2108  if (is_visual_object_identifier) {
2109  skip_bits(gb, 4+3);
2110  }
2111  visual_object_type = get_bits(gb, 4);
2112 
2113  if (visual_object_type == VOT_VIDEO_ID ||
2114  visual_object_type == VOT_STILL_TEXTURE_ID) {
2115  int video_signal_type = get_bits1(gb);
2116  if (video_signal_type) {
2117  int video_range, color_description;
2118  skip_bits(gb, 3); // video_format
2119  video_range = get_bits1(gb);
2120  color_description = get_bits1(gb);
2121 
2122  s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
2123 
2124  if (color_description) {
2125  s->avctx->color_primaries = get_bits(gb, 8);
2126  s->avctx->color_trc = get_bits(gb, 8);
2127  s->avctx->colorspace = get_bits(gb, 8);
2128  }
2129  }
2130  }
2131 
2132  return 0;
2133 }
2134 
2136 {
2137  int i, v;
2138 
2139  /* load default matrices */
2140  for (i = 0; i < 64; i++) {
2141  int j = s->idsp.idct_permutation[i];
2143  s->intra_matrix[j] = v;
2144  s->chroma_intra_matrix[j] = v;
2145 
2147  s->inter_matrix[j] = v;
2148  s->chroma_inter_matrix[j] = v;
2149  }
2150 }
2151 
2153 {
2154  MpegEncContext *s = &ctx->m;
2155  int width, height, vo_ver_id;
2156 
2157  /* vol header */
2158  skip_bits(gb, 1); /* random access */
2159  s->vo_type = get_bits(gb, 8);
2160 
2161  /* If we are in studio profile (per vo_type), check if its all consistent
2162  * and if so continue pass control to decode_studio_vol_header().
2163  * elIf something is inconsistent, error out
2164  * else continue with (non studio) vol header decpoding.
2165  */
2166  if (s->vo_type == CORE_STUDIO_VO_TYPE ||
2169  return AVERROR_INVALIDDATA;
2170  s->studio_profile = 1;
2172  return decode_studio_vol_header(ctx, gb);
2173  } else if (s->studio_profile) {
2174  return AVERROR_PATCHWELCOME;
2175  }
2176 
2177  if (get_bits1(gb) != 0) { /* is_ol_id */
2178  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
2179  skip_bits(gb, 3); /* vo_priority */
2180  } else {
2181  vo_ver_id = 1;
2182  }
2183  s->aspect_ratio_info = get_bits(gb, 4);
2185  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2186  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2187  } else {
2189  }
2190 
2191  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
2192  int chroma_format = get_bits(gb, 2);
2193  if (chroma_format != CHROMA_420)
2194  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2195 
2196  s->low_delay = get_bits1(gb);
2197  if (get_bits1(gb)) { /* vbv parameters */
2198  get_bits(gb, 15); /* first_half_bitrate */
2199  check_marker(s->avctx, gb, "after first_half_bitrate");
2200  get_bits(gb, 15); /* latter_half_bitrate */
2201  check_marker(s->avctx, gb, "after latter_half_bitrate");
2202  get_bits(gb, 15); /* first_half_vbv_buffer_size */
2203  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2204  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
2205  get_bits(gb, 11); /* first_half_vbv_occupancy */
2206  check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
2207  get_bits(gb, 15); /* latter_half_vbv_occupancy */
2208  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2209  }
2210  } else {
2211  /* is setting low delay flag only once the smartest thing to do?
2212  * low delay detection will not be overridden. */
2213  if (s->picture_number == 0) {
2214  switch(s->vo_type) {
2215  case SIMPLE_VO_TYPE:
2216  case ADV_SIMPLE_VO_TYPE:
2217  s->low_delay = 1;
2218  break;
2219  default:
2220  s->low_delay = 0;
2221  }
2222  }
2223  }
2224 
2225  ctx->shape = get_bits(gb, 2); /* vol shape */
2226  if (ctx->shape != RECT_SHAPE)
2227  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
2228  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
2229  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
2230  skip_bits(gb, 4); /* video_object_layer_shape_extension */
2231  }
2232 
2233  check_marker(s->avctx, gb, "before time_increment_resolution");
2234 
2235  s->avctx->framerate.num = get_bits(gb, 16);
2236  if (!s->avctx->framerate.num) {
2237  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
2238  return AVERROR_INVALIDDATA;
2239  }
2240 
2241  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
2242  if (ctx->time_increment_bits < 1)
2243  ctx->time_increment_bits = 1;
2244 
2245  check_marker(s->avctx, gb, "before fixed_vop_rate");
2246 
2247  if (get_bits1(gb) != 0) /* fixed_vop_rate */
2249  else
2250  s->avctx->framerate.den = 1;
2251 
2252  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2253 
2254  ctx->t_frame = 0;
2255 
2256  if (ctx->shape != BIN_ONLY_SHAPE) {
2257  if (ctx->shape == RECT_SHAPE) {
2258  check_marker(s->avctx, gb, "before width");
2259  width = get_bits(gb, 13);
2260  check_marker(s->avctx, gb, "before height");
2261  height = get_bits(gb, 13);
2262  check_marker(s->avctx, gb, "after height");
2263  if (width && height && /* they should be non zero but who knows */
2264  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
2265  if (s->width && s->height &&
2266  (s->width != width || s->height != height))
2267  s->context_reinit = 1;
2268  s->width = width;
2269  s->height = height;
2270  }
2271  }
2272 
2274  s->progressive_frame = get_bits1(gb) ^ 1;
2275  s->interlaced_dct = 0;
2276  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
2277  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
2278  "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
2279  if (vo_ver_id == 1)
2280  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
2281  else
2282  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
2283 
2284  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2285  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
2286  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
2287  ctx->vol_sprite_usage == GMC_SPRITE) {
2288  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
2289  skip_bits(gb, 13); // sprite_width
2290  check_marker(s->avctx, gb, "after sprite_width");
2291  skip_bits(gb, 13); // sprite_height
2292  check_marker(s->avctx, gb, "after sprite_height");
2293  skip_bits(gb, 13); // sprite_left
2294  check_marker(s->avctx, gb, "after sprite_left");
2295  skip_bits(gb, 13); // sprite_top
2296  check_marker(s->avctx, gb, "after sprite_top");
2297  }
2298  ctx->num_sprite_warping_points = get_bits(gb, 6);
2299  if (ctx->num_sprite_warping_points > 3) {
2301  "%d sprite_warping_points\n",
2303  ctx->num_sprite_warping_points = 0;
2304  return AVERROR_INVALIDDATA;
2305  }
2306  s->sprite_warping_accuracy = get_bits(gb, 2);
2308  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2309  skip_bits1(gb); // low_latency_sprite
2310  }
2311  // FIXME sadct disable bit if verid!=1 && shape not rect
2312 
2313  if (get_bits1(gb) == 1) { /* not_8_bit */
2314  s->quant_precision = get_bits(gb, 4); /* quant_precision */
2315  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
2316  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
2317  if (s->quant_precision != 5)
2319  "quant precision %d\n", s->quant_precision);
2320  if (s->quant_precision<3 || s->quant_precision>9) {
2321  s->quant_precision = 5;
2322  }
2323  } else {
2324  s->quant_precision = 5;
2325  }
2326 
2327  // FIXME a bunch of grayscale shape things
2328 
2329  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
2330  int i, v;
2331 
2333 
2334  /* load custom intra matrix */
2335  if (get_bits1(gb)) {
2336  int last = 0;
2337  for (i = 0; i < 64; i++) {
2338  int j;
2339  if (get_bits_left(gb) < 8) {
2340  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2341  return AVERROR_INVALIDDATA;
2342  }
2343  v = get_bits(gb, 8);
2344  if (v == 0)
2345  break;
2346 
2347  last = v;
2349  s->intra_matrix[j] = last;
2350  s->chroma_intra_matrix[j] = last;
2351  }
2352 
2353  /* replicate last value */
2354  for (; i < 64; i++) {
2355  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2356  s->intra_matrix[j] = last;
2357  s->chroma_intra_matrix[j] = last;
2358  }
2359  }
2360 
2361  /* load custom non intra matrix */
2362  if (get_bits1(gb)) {
2363  int last = 0;
2364  for (i = 0; i < 64; i++) {
2365  int j;
2366  if (get_bits_left(gb) < 8) {
2367  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2368  return AVERROR_INVALIDDATA;
2369  }
2370  v = get_bits(gb, 8);
2371  if (v == 0)
2372  break;
2373 
2374  last = v;
2376  s->inter_matrix[j] = v;
2377  s->chroma_inter_matrix[j] = v;
2378  }
2379 
2380  /* replicate last value */
2381  for (; i < 64; i++) {
2382  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2383  s->inter_matrix[j] = last;
2384  s->chroma_inter_matrix[j] = last;
2385  }
2386  }
2387 
2388  // FIXME a bunch of grayscale shape things
2389  }
2390 
2391  if (vo_ver_id != 1)
2392  s->quarter_sample = get_bits1(gb);
2393  else
2394  s->quarter_sample = 0;
2395 
2396  if (get_bits_left(gb) < 4) {
2397  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
2398  return AVERROR_INVALIDDATA;
2399  }
2400 
2401  if (!get_bits1(gb)) {
2402  int pos = get_bits_count(gb);
2403  int estimation_method = get_bits(gb, 2);
2404  if (estimation_method < 2) {
2405  if (!get_bits1(gb)) {
2406  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2407  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2408  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2409  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2410  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2411  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2412  }
2413  if (!get_bits1(gb)) {
2414  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2415  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2416  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2417  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2418  }
2419  if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2420  skip_bits_long(gb, pos - get_bits_count(gb));
2421  goto no_cplx_est;
2422  }
2423  if (!get_bits1(gb)) {
2424  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2425  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2426  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2427  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2428  }
2429  if (!get_bits1(gb)) {
2430  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2431  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2432  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2433  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2434  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2435  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2436  }
2437  if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2438  skip_bits_long(gb, pos - get_bits_count(gb));
2439  goto no_cplx_est;
2440  }
2441  if (estimation_method == 1) {
2442  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2443  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2444  }
2445  } else
2447  "Invalid Complexity estimation method %d\n",
2448  estimation_method);
2449  } else {
2450 
2451 no_cplx_est:
2454  ctx->cplx_estimation_trash_b = 0;
2455  }
2456 
2457  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2458 
2459  s->data_partitioning = get_bits1(gb);
2460  if (s->data_partitioning)
2461  ctx->rvlc = get_bits1(gb);
2462 
2463  if (vo_ver_id != 1) {
2464  ctx->new_pred = get_bits1(gb);
2465  if (ctx->new_pred) {
2466  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2467  skip_bits(gb, 2); /* requested upstream message type */
2468  skip_bits1(gb); /* newpred segment type */
2469  }
2470  if (get_bits1(gb)) // reduced_res_vop
2472  "reduced resolution VOP not supported\n");
2473  } else {
2474  ctx->new_pred = 0;
2475  }
2476 
2477  ctx->scalability = get_bits1(gb);
2478 
2479  if (ctx->scalability) {
2480  GetBitContext bak = *gb;
2481  int h_sampling_factor_n;
2482  int h_sampling_factor_m;
2483  int v_sampling_factor_n;
2484  int v_sampling_factor_m;
2485 
2486  skip_bits1(gb); // hierarchy_type
2487  skip_bits(gb, 4); /* ref_layer_id */
2488  skip_bits1(gb); /* ref_layer_sampling_dir */
2489  h_sampling_factor_n = get_bits(gb, 5);
2490  h_sampling_factor_m = get_bits(gb, 5);
2491  v_sampling_factor_n = get_bits(gb, 5);
2492  v_sampling_factor_m = get_bits(gb, 5);
2493  ctx->enhancement_type = get_bits1(gb);
2494 
2495  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2496  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2497  /* illegal scalability header (VERY broken encoder),
2498  * trying to workaround */
2499  ctx->scalability = 0;
2500  *gb = bak;
2501  } else
2502  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2503 
2504  // bin shape stuff FIXME
2505  }
2506  }
2507 
2508  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2509  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",
2510  s->avctx->framerate.den, s->avctx->framerate.num,
2511  ctx->time_increment_bits,
2512  s->quant_precision,
2514  s->low_delay,
2515  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2516  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2517  );
2518  }
2519 
2520  return 0;
2521 }
2522 
2523 /**
2524  * Decode the user data stuff in the header.
2525  * Also initializes divx/xvid/lavc_version/build.
2526  */
2528 {
2529  MpegEncContext *s = &ctx->m;
2530  char buf[256];
2531  int i;
2532  int e;
2533  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2534  char last;
2535 
2536  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2537  if (show_bits(gb, 23) == 0)
2538  break;
2539  buf[i] = get_bits(gb, 8);
2540  }
2541  buf[i] = 0;
2542 
2543  /* divx detection */
2544  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2545  if (e < 2)
2546  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2547  if (e >= 2) {
2548  ctx->divx_version = ver;
2549  ctx->divx_build = build;
2550  s->divx_packed = e == 3 && last == 'p';
2551  }
2552 
2553  /* libavcodec detection */
2554  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2555  if (e != 4)
2556  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2557  if (e != 4) {
2558  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2559  if (e > 1) {
2560  if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2562  "Unknown Lavc version string encountered, %d.%d.%d; "
2563  "clamping sub-version values to 8-bits.\n",
2564  ver, ver2, ver3);
2565  }
2566  build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2567  }
2568  }
2569  if (e != 4) {
2570  if (strcmp(buf, "ffmpeg") == 0)
2571  ctx->lavc_build = 4600;
2572  }
2573  if (e == 4)
2574  ctx->lavc_build = build;
2575 
2576  /* Xvid detection */
2577  e = sscanf(buf, "XviD%d", &build);
2578  if (e == 1)
2579  ctx->xvid_build = build;
2580 
2581  return 0;
2582 }
2583 
2585 {
2586  Mpeg4DecContext *ctx = avctx->priv_data;
2587  MpegEncContext *s = &ctx->m;
2588 
2589  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2590  if (s->codec_tag == AV_RL32("XVID") ||
2591  s->codec_tag == AV_RL32("XVIX") ||
2592  s->codec_tag == AV_RL32("RMP4") ||
2593  s->codec_tag == AV_RL32("ZMP4") ||
2594  s->codec_tag == AV_RL32("SIPP"))
2595  ctx->xvid_build = 0;
2596  }
2597 
2598  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2599  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2600  ctx->vol_control_parameters == 0)
2601  ctx->divx_version = 400; // divx 4
2602 
2603  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2604  ctx->divx_version =
2605  ctx->divx_build = -1;
2606  }
2607 
2609  if (s->codec_tag == AV_RL32("XVIX"))
2611 
2612  if (s->codec_tag == AV_RL32("UMP4"))
2614 
2615  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2617 
2618  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2620 
2621  if (ctx->xvid_build <= 3U)
2622  s->padding_bug_score = 256 * 256 * 256 * 64;
2623 
2624  if (ctx->xvid_build <= 1U)
2626 
2627  if (ctx->xvid_build <= 12U)
2629 
2630  if (ctx->xvid_build <= 32U)
2632 
2633 #define SET_QPEL_FUNC(postfix1, postfix2) \
2634  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2635  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2636  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2637 
2638  if (ctx->lavc_build < 4653U)
2640 
2641  if (ctx->lavc_build < 4655U)
2643 
2644  if (ctx->lavc_build < 4670U)
2646 
2647  if (ctx->lavc_build <= 4712U)
2649 
2650  if ((ctx->lavc_build&0xFF) >= 100) {
2651  if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2652  (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2653  )
2655  }
2656 
2657  if (ctx->divx_version >= 0)
2659  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2660  s->padding_bug_score = 256 * 256 * 256 * 64;
2661 
2662  if (ctx->divx_version < 500U)
2664 
2665  if (ctx->divx_version >= 0)
2667  }
2668 
2669  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2670  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2671  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2672  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2673  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2674  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2675  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2676 
2677  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2678  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2679  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2680  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2681  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2682  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2683  }
2684 
2685  if (avctx->debug & FF_DEBUG_BUGS)
2687  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2688  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2689  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2690 
2691  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2692  s->codec_id == AV_CODEC_ID_MPEG4 &&
2693  avctx->idct_algo == FF_IDCT_AUTO) {
2694  avctx->idct_algo = FF_IDCT_XVID;
2695  ff_mpv_idct_init(s);
2696  return 1;
2697  }
2698 
2699  return 0;
2700 }
2701 
2703 {
2704  MpegEncContext *s = &ctx->m;
2705  int time_incr, time_increment;
2706  int64_t pts;
2707 
2708  s->mcsel = 0;
2709  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2710  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2712  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2713  s->low_delay = 0;
2714  }
2715 
2717  if (s->partitioned_frame)
2719  else
2721 
2722  time_incr = 0;
2723  while (get_bits1(gb) != 0)
2724  time_incr++;
2725 
2726  check_marker(s->avctx, gb, "before time_increment");
2727 
2728  if (ctx->time_increment_bits == 0 ||
2729  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2731  "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);
2732 
2733  for (ctx->time_increment_bits = 1;
2734  ctx->time_increment_bits < 16;
2735  ctx->time_increment_bits++) {
2736  if (s->pict_type == AV_PICTURE_TYPE_P ||
2737  (s->pict_type == AV_PICTURE_TYPE_S &&
2738  ctx->vol_sprite_usage == GMC_SPRITE)) {
2739  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2740  break;
2741  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2742  break;
2743  }
2744 
2746  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2747  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2748  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2749  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2750  }
2751  }
2752 
2753  if (IS_3IV1)
2754  time_increment = get_bits1(gb); // FIXME investigate further
2755  else
2756  time_increment = get_bits(gb, ctx->time_increment_bits);
2757 
2758  if (s->pict_type != AV_PICTURE_TYPE_B) {
2759  s->last_time_base = s->time_base;
2760  s->time_base += time_incr;
2761  s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2762  if (s->workaround_bugs & FF_BUG_UMP4) {
2763  if (s->time < s->last_non_b_time) {
2764  /* header is not mpeg-4-compatible, broken encoder,
2765  * trying to workaround */
2766  s->time_base++;
2767  s->time += s->avctx->framerate.num;
2768  }
2769  }
2770  s->pp_time = s->time - s->last_non_b_time;
2771  s->last_non_b_time = s->time;
2772  } else {
2773  s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2774  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2775  if (s->pp_time <= s->pb_time ||
2776  s->pp_time <= s->pp_time - s->pb_time ||
2777  s->pp_time <= 0) {
2778  /* messed up order, maybe after seeking? skipping current B-frame */
2779  return FRAME_SKIPPED;
2780  }
2782 
2783  if (ctx->t_frame == 0)
2784  ctx->t_frame = s->pb_time;
2785  if (ctx->t_frame == 0)
2786  ctx->t_frame = 1; // 1/0 protection
2788  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2789  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2790  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2791  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2792  s->pb_field_time = 2;
2793  s->pp_field_time = 4;
2794  if (!s->progressive_sequence)
2795  return FRAME_SKIPPED;
2796  }
2797  }
2798 
2799  if (s->avctx->framerate.den)
2800  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2801  else
2802  pts = AV_NOPTS_VALUE;
2803  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2804 
2805  check_marker(s->avctx, gb, "before vop_coded");
2806 
2807  /* vop coded */
2808  if (get_bits1(gb) != 1) {
2809  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2810  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2811  return FRAME_SKIPPED;
2812  }
2813  if (ctx->new_pred)
2814  decode_new_pred(ctx, gb);
2815 
2816  if (ctx->shape != BIN_ONLY_SHAPE &&
2817  (s->pict_type == AV_PICTURE_TYPE_P ||
2818  (s->pict_type == AV_PICTURE_TYPE_S &&
2819  ctx->vol_sprite_usage == GMC_SPRITE))) {
2820  /* rounding type for motion estimation */
2821  s->no_rounding = get_bits1(gb);
2822  } else {
2823  s->no_rounding = 0;
2824  }
2825  // FIXME reduced res stuff
2826 
2827  if (ctx->shape != RECT_SHAPE) {
2828  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2829  skip_bits(gb, 13); /* width */
2830  check_marker(s->avctx, gb, "after width");
2831  skip_bits(gb, 13); /* height */
2832  check_marker(s->avctx, gb, "after height");
2833  skip_bits(gb, 13); /* hor_spat_ref */
2834  check_marker(s->avctx, gb, "after hor_spat_ref");
2835  skip_bits(gb, 13); /* ver_spat_ref */
2836  }
2837  skip_bits1(gb); /* change_CR_disable */
2838 
2839  if (get_bits1(gb) != 0)
2840  skip_bits(gb, 8); /* constant_alpha_value */
2841  }
2842 
2843  // FIXME complexity estimation stuff
2844 
2845  if (ctx->shape != BIN_ONLY_SHAPE) {
2847  if (s->pict_type != AV_PICTURE_TYPE_I)
2849  if (s->pict_type == AV_PICTURE_TYPE_B)
2851 
2852  if (get_bits_left(gb) < 3) {
2853  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2854  return AVERROR_INVALIDDATA;
2855  }
2857  if (!s->progressive_sequence) {
2858  s->top_field_first = get_bits1(gb);
2859  s->alternate_scan = get_bits1(gb);
2860  } else
2861  s->alternate_scan = 0;
2862  }
2863 
2864  if (s->alternate_scan) {
2869  } else {
2874  }
2875 
2876  if (s->pict_type == AV_PICTURE_TYPE_S) {
2877  if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2878  ctx->vol_sprite_usage == GMC_SPRITE)) {
2879  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2880  return AVERROR_INVALIDDATA;
2881  if (ctx->sprite_brightness_change)
2883  "sprite_brightness_change not supported\n");
2884  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2885  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2886  } else {
2887  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2888  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2889  }
2890  }
2891 
2892  if (ctx->shape != BIN_ONLY_SHAPE) {
2893  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2894  if (s->qscale == 0) {
2896  "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2897  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2898  }
2899 
2900  if (s->pict_type != AV_PICTURE_TYPE_I) {
2901  s->f_code = get_bits(gb, 3); /* fcode_for */
2902  if (s->f_code == 0) {
2904  "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2905  s->f_code = 1;
2906  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2907  }
2908  } else
2909  s->f_code = 1;
2910 
2911  if (s->pict_type == AV_PICTURE_TYPE_B) {
2912  s->b_code = get_bits(gb, 3);
2913  if (s->b_code == 0) {
2915  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2916  s->b_code=1;
2917  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2918  }
2919  } else
2920  s->b_code = 1;
2921 
2922  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2924  "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",
2925  s->qscale, s->f_code, s->b_code,
2926  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")),
2928  s->top_field_first, s->quarter_sample ? "q" : "h",
2931  1 - s->no_rounding, s->vo_type,
2932  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2935  s->time,
2936  time_increment
2937  );
2938  }
2939 
2940  if (!ctx->scalability) {
2941  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2942  skip_bits1(gb); // vop shape coding type
2943  } else {
2944  if (ctx->enhancement_type) {
2945  int load_backward_shape = get_bits1(gb);
2946  if (load_backward_shape)
2948  "load backward shape isn't supported\n");
2949  }
2950  skip_bits(gb, 2); // ref_select_code
2951  }
2952  }
2953  /* detect buggy encoders which don't set the low_delay flag
2954  * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2955  * easily (although it's buggy too) */
2956  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2957  ctx->divx_version == -1 && s->picture_number == 0) {
2959  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2960  s->low_delay = 1;
2961  }
2962 
2963  s->picture_number++; // better than pic number==0 always ;)
2964 
2965  // FIXME add short header support
2968 
2969  if (s->workaround_bugs & FF_BUG_EDGE) {
2970  s->h_edge_pos = s->width;
2971  s->v_edge_pos = s->height;
2972  }
2973  return 0;
2974 }
2975 
2977 {
2978  int i, j, v;
2979 
2980  if (get_bits1(gb)) {
2981  if (get_bits_left(gb) < 64*8)
2982  return AVERROR_INVALIDDATA;
2983  /* intra_quantiser_matrix */
2984  for (i = 0; i < 64; i++) {
2985  v = get_bits(gb, 8);
2987  s->intra_matrix[j] = v;
2988  s->chroma_intra_matrix[j] = v;
2989  }
2990  }
2991 
2992  if (get_bits1(gb)) {
2993  if (get_bits_left(gb) < 64*8)
2994  return AVERROR_INVALIDDATA;
2995  /* non_intra_quantiser_matrix */
2996  for (i = 0; i < 64; i++) {
2997  get_bits(gb, 8);
2998  }
2999  }
3000 
3001  if (get_bits1(gb)) {
3002  if (get_bits_left(gb) < 64*8)
3003  return AVERROR_INVALIDDATA;
3004  /* chroma_intra_quantiser_matrix */
3005  for (i = 0; i < 64; i++) {
3006  v = get_bits(gb, 8);
3008  s->chroma_intra_matrix[j] = v;
3009  }
3010  }
3011 
3012  if (get_bits1(gb)) {
3013  if (get_bits_left(gb) < 64*8)
3014  return AVERROR_INVALIDDATA;
3015  /* chroma_non_intra_quantiser_matrix */
3016  for (i = 0; i < 64; i++) {
3017  get_bits(gb, 8);
3018  }
3019  }
3020 
3022  return 0;
3023 }
3024 
3026 {
3027  uint32_t startcode;
3028  uint8_t extension_type;
3029 
3030  startcode = show_bits_long(gb, 32);
3031  if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {
3032 
3033  if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
3034  skip_bits_long(gb, 32);
3035  extension_type = get_bits(gb, 4);
3036  if (extension_type == QUANT_MATRIX_EXT_ID)
3037  read_quant_matrix_ext(s, gb);
3038  }
3039  }
3040 }
3041 
3043 {
3044  MpegEncContext *s = &ctx->m;
3045 
3046  skip_bits(gb, 16); /* Time_code[63..48] */
3047  check_marker(s->avctx, gb, "after Time_code[63..48]");
3048  skip_bits(gb, 16); /* Time_code[47..32] */
3049  check_marker(s->avctx, gb, "after Time_code[47..32]");
3050  skip_bits(gb, 16); /* Time_code[31..16] */
3051  check_marker(s->avctx, gb, "after Time_code[31..16]");
3052  skip_bits(gb, 16); /* Time_code[15..0] */
3053  check_marker(s->avctx, gb, "after Time_code[15..0]");
3054  skip_bits(gb, 4); /* reserved_bits */
3055 }
3056 
3057 /**
3058  * Decode the next studio vop header.
3059  * @return <0 if something went wrong
3060  */
3062 {
3063  MpegEncContext *s = &ctx->m;
3064 
3065  if (get_bits_left(gb) <= 32)
3066  return 0;
3067 
3068  s->partitioned_frame = 0;
3069  s->interlaced_dct = 0;
3071 
3072  decode_smpte_tc(ctx, gb);
3073 
3074  skip_bits(gb, 10); /* temporal_reference */
3075  skip_bits(gb, 2); /* vop_structure */
3076  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
3077  if (get_bits1(gb)) { /* vop_coded */
3078  skip_bits1(gb); /* top_field_first */
3079  skip_bits1(gb); /* repeat_first_field */
3080  s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
3081  }
3082 
3083  if (s->pict_type == AV_PICTURE_TYPE_I) {
3084  if (get_bits1(gb))
3086  }
3087 
3088  if (ctx->shape != BIN_ONLY_SHAPE) {
3089  s->alternate_scan = get_bits1(gb);
3091  s->dct_precision = get_bits(gb, 2);
3092  s->intra_dc_precision = get_bits(gb, 2);
3093  s->q_scale_type = get_bits1(gb);
3094  }
3095 
3096  if (s->alternate_scan) {
3101  } else {
3106  }
3107 
3109 
3111  extension_and_user_data(s, gb, 4);
3112 
3113  return 0;
3114 }
3115 
3117 {
3118  MpegEncContext *s = &ctx->m;
3119  int visual_object_type;
3120 
3121  skip_bits(gb, 4); /* visual_object_verid */
3122  visual_object_type = get_bits(gb, 4);
3123  if (visual_object_type != VOT_VIDEO_ID) {
3124  avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
3125  return AVERROR_PATCHWELCOME;
3126  }
3127 
3129  extension_and_user_data(s, gb, 1);
3130 
3131  return 0;
3132 }
3133 
3135 {
3136  MpegEncContext *s = &ctx->m;
3137  int width, height;
3138  int bits_per_raw_sample;
3139  int rgb, chroma_format;
3140 
3141  // random_accessible_vol and video_object_type_indication have already
3142  // been read by the caller decode_vol_header()
3143  skip_bits(gb, 4); /* video_object_layer_verid */
3144  ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
3145  skip_bits(gb, 4); /* video_object_layer_shape_extension */
3146  skip_bits1(gb); /* progressive_sequence */
3147  if (ctx->shape != RECT_SHAPE) {
3148  avpriv_request_sample(s->avctx, "MPEG-4 Studio profile non rectangular shape");
3149  return AVERROR_PATCHWELCOME;
3150  }
3151  if (ctx->shape != BIN_ONLY_SHAPE) {
3152  rgb = get_bits1(gb); /* rgb_components */
3153  chroma_format = get_bits(gb, 2); /* chroma_format */
3154  if (!chroma_format || chroma_format == CHROMA_420 || (rgb && chroma_format == CHROMA_422)) {
3155  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
3156  return AVERROR_INVALIDDATA;
3157  }
3158 
3159  bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
3160  if (bits_per_raw_sample == 10) {
3161  if (rgb) {
3163  }
3164  else {
3166  }
3167  }
3168  else {
3169  avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
3170  return AVERROR_PATCHWELCOME;
3171  }
3172  if (rgb != ctx->rgb || s->chroma_format != chroma_format)
3173  s->context_reinit = 1;
3174  s->avctx->bits_per_raw_sample = bits_per_raw_sample;
3175  ctx->rgb = rgb;
3176  s->chroma_format = chroma_format;
3177  }
3178  if (ctx->shape == RECT_SHAPE) {
3179  check_marker(s->avctx, gb, "before video_object_layer_width");
3180  width = get_bits(gb, 14); /* video_object_layer_width */
3181  check_marker(s->avctx, gb, "before video_object_layer_height");
3182  height = get_bits(gb, 14); /* video_object_layer_height */
3183  check_marker(s->avctx, gb, "after video_object_layer_height");
3184 
3185  /* Do the same check as non-studio profile */
3186  if (width && height) {
3187  if (s->width && s->height &&
3188  (s->width != width || s->height != height))
3189  s->context_reinit = 1;
3190  s->width = width;
3191  s->height = height;
3192  }
3193  }
3194  s->aspect_ratio_info = get_bits(gb, 4);
3196  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
3197  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
3198  } else {
3200  }
3201  skip_bits(gb, 4); /* frame_rate_code */
3202  skip_bits(gb, 15); /* first_half_bit_rate */
3203  check_marker(s->avctx, gb, "after first_half_bit_rate");
3204  skip_bits(gb, 15); /* latter_half_bit_rate */
3205  check_marker(s->avctx, gb, "after latter_half_bit_rate");
3206  skip_bits(gb, 15); /* first_half_vbv_buffer_size */
3207  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
3208  skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
3209  skip_bits(gb, 11); /* first_half_vbv_buffer_size */
3210  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
3211  skip_bits(gb, 15); /* latter_half_vbv_occupancy */
3212  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
3213  s->low_delay = get_bits1(gb);
3214  s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */
3215 
3217  extension_and_user_data(s, gb, 2);
3218 
3219  return 0;
3220 }
3221 
3222 /**
3223  * Decode MPEG-4 headers.
3224  *
3225  * @param header If set the absence of a VOP is not treated as error; otherwise, it is treated as such.
3226  * @return <0 if an error occurred
3227  * FRAME_SKIPPED if a not coded VOP is found
3228  * 0 else
3229  */
3231 {
3232  MpegEncContext *s = &ctx->m;
3233  unsigned startcode, v;
3234  int ret;
3235  int vol = 0;
3236 
3237  /* search next start code */
3238  align_get_bits(gb);
3239 
3240  // If we have not switched to studio profile than we also did not switch bps
3241  // that means something else (like a previous instance) outside set bps which
3242  // would be inconsistant with the currect state, thus reset it
3243  if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
3244  s->avctx->bits_per_raw_sample = 0;
3245 
3246  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
3247  skip_bits(gb, 24);
3248  if (get_bits(gb, 8) == 0xF0)
3249  goto end;
3250  }
3251 
3252  startcode = 0xff;
3253  for (;;) {
3254  if (get_bits_count(gb) >= gb->size_in_bits) {
3255  if (gb->size_in_bits == 8 &&
3256  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
3257  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
3258  return FRAME_SKIPPED; // divx bug
3259  } else if (header && get_bits_count(gb) == gb->size_in_bits) {
3260  return 0; // ordinary return value for parsing of extradata
3261  } else
3262  return AVERROR_INVALIDDATA; // end of stream
3263  }
3264 
3265  /* use the bits after the test */
3266  v = get_bits(gb, 8);
3267  startcode = ((startcode << 8) | v) & 0xffffffff;
3268 
3269  if ((startcode & 0xFFFFFF00) != 0x100)
3270  continue; // no startcode
3271 
3272  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
3273  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
3274  if (startcode <= 0x11F)
3275  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
3276  else if (startcode <= 0x12F)
3277  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
3278  else if (startcode <= 0x13F)
3279  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3280  else if (startcode <= 0x15F)
3281  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
3282  else if (startcode <= 0x1AF)
3283  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3284  else if (startcode == 0x1B0)
3285  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
3286  else if (startcode == 0x1B1)
3287  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
3288  else if (startcode == 0x1B2)
3289  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
3290  else if (startcode == 0x1B3)
3291  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
3292  else if (startcode == 0x1B4)
3293  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
3294  else if (startcode == 0x1B5)
3295  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
3296  else if (startcode == 0x1B6)
3297  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
3298  else if (startcode == 0x1B7)
3299  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
3300  else if (startcode == 0x1B8)
3301  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
3302  else if (startcode == 0x1B9)
3303  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
3304  else if (startcode == 0x1BA)
3305  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
3306  else if (startcode == 0x1BB)
3307  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
3308  else if (startcode == 0x1BC)
3309  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
3310  else if (startcode == 0x1BD)
3311  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
3312  else if (startcode == 0x1BE)
3313  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
3314  else if (startcode == 0x1BF)
3315  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
3316  else if (startcode == 0x1C0)
3317  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
3318  else if (startcode == 0x1C1)
3319  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
3320  else if (startcode == 0x1C2)
3321  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
3322  else if (startcode == 0x1C3)
3323  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
3324  else if (startcode <= 0x1C5)
3325  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
3326  else if (startcode <= 0x1FF)
3327  av_log(s->avctx, AV_LOG_DEBUG, "System start");
3328  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
3329  }
3330 
3331  if (startcode >= 0x120 && startcode <= 0x12F) {
3332  if (vol) {
3333  av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
3334  continue;
3335  }
3336  vol++;
3337  if ((ret = decode_vol_header(ctx, gb)) < 0)
3338  return ret;
3339  } else if (startcode == USER_DATA_STARTCODE) {
3340  decode_user_data(ctx, gb);
3341  } else if (startcode == GOP_STARTCODE) {
3342  mpeg4_decode_gop_header(s, gb);
3343  } else if (startcode == VOS_STARTCODE) {
3344  int profile, level;
3345  mpeg4_decode_profile_level(s, gb, &profile, &level);
3346  if (profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO &&
3347  (level > 0 && level < 9)) {
3348  s->studio_profile = 1;
3350  extension_and_user_data(s, gb, 0);
3351  } else if (s->studio_profile) {
3352  avpriv_request_sample(s->avctx, "Mixes studio and non studio profile\n");
3353  return AVERROR_PATCHWELCOME;
3354  }
3355  s->avctx->profile = profile;
3356  s->avctx->level = level;
3357  } else if (startcode == VISUAL_OBJ_STARTCODE) {
3358  if (s->studio_profile) {
3359  if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
3360  return ret;
3361  } else
3363  } else if (startcode == VOP_STARTCODE) {
3364  break;
3365  }
3366 
3367  align_get_bits(gb);
3368  startcode = 0xff;
3369  }
3370 
3371 end:
3373  s->low_delay = 1;
3374  s->avctx->has_b_frames = !s->low_delay;
3375 
3376  if (s->studio_profile) {
3377  if (!s->avctx->bits_per_raw_sample) {
3378  av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
3379  return AVERROR_INVALIDDATA;
3380  }
3381  return decode_studio_vop_header(ctx, gb);
3382  } else
3383  return decode_vop_header(ctx, gb);
3384 }
3385 
3387  static int done = 0;
3388 
3389  if (!done) {
3396  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
3397  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
3398  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
3399  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
3400  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
3401  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
3402  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
3403  &ff_sprite_trajectory_tab[0][1], 4, 2,
3404  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
3405  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
3406  &ff_mb_type_b_tab[0][1], 2, 1,
3407  &ff_mb_type_b_tab[0][0], 2, 1, 16);
3408  done = 1;
3409  }
3410 }
3411 
3412 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
3413 {
3414  Mpeg4DecContext *ctx = avctx->priv_data;
3415  MpegEncContext *s = &ctx->m;
3416 
3417  /* divx 5.01+ bitstream reorder stuff */
3418  /* Since this clobbers the input buffer and hwaccel codecs still need the
3419  * data during hwaccel->end_frame we should not do this any earlier */
3420  if (s->divx_packed) {
3421  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
3422  int startcode_found = 0;
3423 
3424  if (buf_size - current_pos > 7) {
3425 
3426  int i;
3427  for (i = current_pos; i < buf_size - 4; i++)
3428 
3429  if (buf[i] == 0 &&
3430  buf[i + 1] == 0 &&
3431  buf[i + 2] == 1 &&
3432  buf[i + 3] == 0xB6) {
3433  startcode_found = !(buf[i + 4] & 0x40);
3434  break;
3435  }
3436  }
3437 
3438  if (startcode_found) {
3439  if (!ctx->showed_packed_warning) {
3440  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
3441  "wasteful way to store B-frames ('packed B-frames'). "
3442  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
3443  ctx->showed_packed_warning = 1;
3444  }
3447  buf_size - current_pos);
3448  if (!s->bitstream_buffer) {
3449  s->bitstream_buffer_size = 0;
3450  return AVERROR(ENOMEM);
3451  }
3452  memcpy(s->bitstream_buffer, buf + current_pos,
3453  buf_size - current_pos);
3454  s->bitstream_buffer_size = buf_size - current_pos;
3455  }
3456  }
3457 
3458  return 0;
3459 }
3460 
3461 #if HAVE_THREADS
3462 static int mpeg4_update_thread_context(AVCodecContext *dst,
3463  const AVCodecContext *src)
3464 {
3465  Mpeg4DecContext *s = dst->priv_data;
3466  const Mpeg4DecContext *s1 = src->priv_data;
3467  int init = s->m.context_initialized;
3468 
3469  int ret = ff_mpeg_update_thread_context(dst, src);
3470 
3471  if (ret < 0)
3472  return ret;
3473 
3474  // copy all the necessary fields explicitly
3476  s->shape = s1->shape;
3480  s->rvlc = s1->rvlc;
3481  s->resync_marker = s1->resync_marker;
3482  s->t_frame = s1->t_frame;
3483  s->new_pred = s1->new_pred;
3485  s->scalability = s1->scalability;
3488  s->divx_version = s1->divx_version;
3489  s->divx_build = s1->divx_build;
3490  s->xvid_build = s1->xvid_build;
3491  s->lavc_build = s1->lavc_build;
3497  s->rgb = s1->rgb;
3498 
3499  memcpy(s->sprite_shift, s1->sprite_shift, sizeof(s1->sprite_shift));
3500  memcpy(s->sprite_traj, s1->sprite_traj, sizeof(s1->sprite_traj));
3501 
3502  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
3503  ff_xvid_idct_init(&s->m.idsp, dst);
3504 
3505  return 0;
3506 }
3507 #endif
3508 
3510 {
3511  int i, ret;
3512 
3513  for (i = 0; i < 12; i++) {
3514  ret = init_vlc(&ctx->studio_intra_tab[i], STUDIO_INTRA_BITS, 22,
3515  &ff_mpeg4_studio_intra[i][0][1], 4, 2,
3516  &ff_mpeg4_studio_intra[i][0][0], 4, 2,
3517  0);
3518 
3519  if (ret < 0)
3520  return ret;
3521  }
3522 
3523  ret = init_vlc(&ctx->studio_luma_dc, STUDIO_INTRA_BITS, 19,
3524  &ff_mpeg4_studio_dc_luma[0][1], 4, 2,
3525  &ff_mpeg4_studio_dc_luma[0][0], 4, 2,
3526  0);
3527  if (ret < 0)
3528  return ret;
3529 
3530  ret = init_vlc(&ctx->studio_chroma_dc, STUDIO_INTRA_BITS, 19,
3531  &ff_mpeg4_studio_dc_chroma[0][1], 4, 2,
3532  &ff_mpeg4_studio_dc_chroma[0][0], 4, 2,
3533  0);
3534  if (ret < 0)
3535  return ret;
3536 
3537  return 0;
3538 }
3539 
3541 {
3542  Mpeg4DecContext *ctx = avctx->priv_data;
3543  MpegEncContext *s = &ctx->m;
3544  int ret;
3545 
3546  ctx->divx_version =
3547  ctx->divx_build =
3548  ctx->xvid_build =
3549  ctx->lavc_build = -1;
3550 
3551  if ((ret = ff_h263_decode_init(avctx)) < 0)
3552  return ret;
3553 
3555  if ((ret = init_studio_vlcs(ctx)) < 0)
3556  return ret;
3557 
3558  s->h263_pred = 1;
3559  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
3561  ctx->time_increment_bits = 4; /* default value for broken headers */
3562 
3564 
3565  return 0;
3566 }
3567 
3569 {
3570  Mpeg4DecContext *ctx = avctx->priv_data;
3571  int i;
3572 
3573  for (i = 0; i < 12; i++)
3574  ff_free_vlc(&ctx->studio_intra_tab[i]);
3575 
3576  ff_free_vlc(&ctx->studio_luma_dc);
3578 
3579  return ff_h263_decode_end(avctx);
3580 }
3581 
3582 static const AVOption mpeg4_options[] = {
3583  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
3584  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
3585  {NULL}
3586 };
3587 
3588 static const AVClass mpeg4_class = {
3589  .class_name = "MPEG4 Video Decoder",
3590  .item_name = av_default_item_name,
3591  .option = mpeg4_options,
3592  .version = LIBAVUTIL_VERSION_INT,
3593 };
3594 
3596  .name = "mpeg4",
3597  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
3598  .type = AVMEDIA_TYPE_VIDEO,
3599  .id = AV_CODEC_ID_MPEG4,
3600  .priv_data_size = sizeof(Mpeg4DecContext),
3601  .init = decode_init,
3602  .close = decode_end,
3607  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
3609  .flush = ff_mpeg_flush,
3610  .max_lowres = 3,
3613  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
3614  .priv_class = &mpeg4_class,
3615  .hw_configs = (const AVCodecHWConfigInternal*[]) {
3616 #if CONFIG_MPEG4_NVDEC_HWACCEL
3617  HWACCEL_NVDEC(mpeg4),
3618 #endif
3619 #if CONFIG_MPEG4_VAAPI_HWACCEL
3620  HWACCEL_VAAPI(mpeg4),
3621 #endif
3622 #if CONFIG_MPEG4_VDPAU_HWACCEL
3623  HWACCEL_VDPAU(mpeg4),
3624 #endif
3625 #if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
3626  HWACCEL_VIDEOTOOLBOX(mpeg4),
3627 #endif
3628  NULL
3629  },
3630 };
int last_time_base
Definition: mpegvideo.h:388
int bitstream_buffer_size
Definition: mpegvideo.h:416
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:602
uint16_t sprite_traj[4][2]
sprite trajectory points
Definition: mpeg4video.h:84
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:1675
#define ff_tlog(ctx,...)
Definition: internal.h:86
IDCTDSPContext idsp
Definition: mpegvideo.h:230
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:2073
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2279
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define EXT_STARTCODE
Definition: mpeg4video.h:67
static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
int aspect_ratio_info
Definition: mpegvideo.h:402
int picture_number
Definition: mpegvideo.h:127
#define MB_TYPE_L1
Definition: mpegutils.h:68
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:1566
ScanTable intra_v_scantable
Definition: mpegvideo.h:93
static int shift(int a, int b)
Definition: sonic.c:82
S(GMC)-VOP MPEG-4.
Definition: avutil.h:277
RLTable ff_mpeg4_rl_intra
Definition: mpeg4data.h:109
const uint8_t ff_mpeg4_c_dc_scale_table[32]
Definition: mpeg4data.h:363
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
Definition: pixfmt.h:556
static const uint8_t ac_state_tab[22][2]
static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
#define CBPY_VLC_BITS
Definition: h263.h:39
const uint16_t ff_mpeg4_studio_dc_chroma[19][2]
Definition: mpeg4data.h:385
int sprite_brightness_change
Definition: mpeg4video.h:81
int dpcm_direction
Definition: mpegvideo.h:513
AVOption.
Definition: opt.h:246
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:269
static void flush(AVCodecContext *avctx)
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:188
#define MB_TYPE_DIRECT2
Definition: mpegutils.h:59
int sprite_warping_accuracy
Definition: mpegvideo.h:403
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG-1 & B-frame MPEG-4
Definition: mpegvideo.h:278
av_cold void ff_mpeg4videodec_static_init(void)
float re
Definition: fft.c:82
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:519
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
Decode the next video packet.
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:291
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:48
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
int resync_marker
could this stream contain resync markers
Definition: mpeg4video.h:91
static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:301
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:75
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
int16_t(*[3] ac_val)[16]
used for MPEG-4 AC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:194
#define avpriv_request_sample(...)
int v_edge_pos
horizontal / vertical position of the right/bottom edge (pixel replication)
Definition: mpegvideo.h:132
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:185
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:303
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1161
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:612
int num
Numerator.
Definition: rational.h:59
#define HWACCEL_NVDEC(codec)
Definition: hwconfig.h:71
uint8_t * bitstream_buffer
Definition: mpegvideo.h:415
enum AVCodecID codec_id
Definition: mpegvideo.h:112
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:1674
#define AV_PIX_FMT_GBRP10
Definition: pixfmt.h:413
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
#define SIMPLE_STUDIO_VO_TYPE
Definition: mpeg4video.h:44
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:1575
const uint8_t * buffer
Definition: get_bits.h:62
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:69
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:905
static av_cold int decode_init(AVCodecContext *avctx)
#define MB_TYPE_INTRA
Definition: mpegutils.h:73
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO
Definition: avcodec.h:1937
#define MB_TYPE_16x8
Definition: mpegutils.h:55
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:70
int studio_profile
Definition: mpegvideo.h:384
int real_sprite_warping_points
Definition: mpegvideo.h:396
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:1668
mpegvideo header.
#define DC_VLC_BITS
Definition: mpeg4videodec.c:47
#define DC_MARKER
Definition: mpeg4video.h:59
uint8_t permutated[64]
Definition: idctdsp.h:33
uint8_t run
Definition: svq3.c:209
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1761
#define ER_MV_ERROR
int padding_bug_score
used to detect the VERY common padding bug in MPEG-4
Definition: mpegvideo.h:411
#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
Definition: vlc.h:38
void ff_thread_await_progress(ThreadFrame *f, int n, int field)
Wait for earlier decoding threads to finish reference pictures.
#define SLICE_OK
Definition: mpegvideo.h:516
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:133
static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
int profile
profile
Definition: avcodec.h:1863
static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
int stride
Definition: mace.c:144
AVCodec.
Definition: codec.h:190
int time_base
time in seconds of last I,P,S Frame
Definition: mpegvideo.h:389
RLTable.
Definition: rl.h:39
int qscale
QP.
Definition: mpegvideo.h:204
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
const AVProfile ff_mpeg4_video_profiles[]
Definition: profiles.c:105
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:307
int chroma_x_shift
Definition: mpegvideo.h:486
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header)
Decode MPEG-4 headers.
int field_select[2][2]
Definition: mpegvideo.h:277
int block_wrap[6]
Definition: mpegvideo.h:294
int quant_precision
Definition: mpegvideo.h:400
int cplx_estimation_trash_b
Definition: mpeg4video.h:116
#define STUDIO_INTRA_BITS
Definition: mpeg4videodec.c:49
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:1916
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:649
#define SLICE_START_CODE
Definition: mpegvideo.h:75
int vol_sprite_usage
Definition: mpeg4video.h:80
static int16_t block[64]
Definition: dct.c:115
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
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
#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:75
#define USES_LIST(a, list)
Definition: mpegutils.h:99
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
#define USER_DATA_STARTCODE
Definition: mpeg4video.h:62
int mb_num_left
number of MBs left in this video packet (for partitioned Slices only)
Definition: mpegvideo.h:359
int64_t time
time of current frame
Definition: mpegvideo.h:390
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:47
int context_reinit
Definition: mpegvideo.h:564
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (MPEG-4) ...
Definition: mpegvideo.h:264
uint8_t
#define av_cold
Definition: attributes.h:88
#define HWACCEL_VDPAU(codec)
Definition: hwconfig.h:75
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
float delta
AVOptions.
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1616
const uint16_t ff_sprite_trajectory_tab[15][2]
Definition: mpeg4data.h:326
#define VOP_STARTCODE
Definition: mpeg4video.h:65
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:92
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
#define IS_3IV1
Definition: mpeg4video.h:192
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:200
Multithreading support functions.
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:325
#define FF_BUG_EDGE
Definition: avcodec.h:1574
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
Definition: mpegvideo.h:284
int enhancement_type
Definition: mpeg4video.h:96
int interlaced_dct
Definition: mpegvideo.h:491
static void mpeg4_load_default_matrices(MpegEncContext *s)
#define MB_TYPE_16x16
Definition: mpegutils.h:54
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:180
#define CHROMA_420
Definition: mpegvideo.h:483
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
#define MB_TYPE_ACPRED
Definition: mpegutils.h:60
int intra_dc_precision
Definition: mpegvideo.h:464
int cplx_estimation_trash_p
Definition: mpeg4video.h:115
#define RECT_SHAPE
Definition: mpeg4video.h:33
#define height
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
const uint16_t ff_mpeg4_studio_intra[12][22][2]
Definition: mpeg4data.h:393
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:1572
#define FF_BUG_STD_QPEL
Definition: avcodec.h:1571
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:46
#define ER_MV_END
#define ff_dlog(a,...)
uint16_t pp_time
time distance between the last 2 p,s,i frames
Definition: mpegvideo.h:392
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:329
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:129
#define max(a, b)
Definition: cuda_runtime.h:33
static const uint8_t header[24]
Definition: sdr2.c:67
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:120
int intra_dc_threshold
QP above which the ac VLC should be used for intra dc.
Definition: mpeg4video.h:101
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1168
#define MAX_LEVEL
Definition: rl.h:36
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:202
#define FF_BUG_IEDGE
Definition: avcodec.h:1579
#define av_log(a,...)
#define MOTION_MARKER
Definition: mpeg4video.h:58
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:740
#define FF_IDCT_AUTO
Definition: avcodec.h:1734
#define FF_CODEC_CAP_ALLOCATE_PROGRESS
Definition: internal.h:75
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2343
MpegEncContext m
Definition: mpeg4video.h:75
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:397
#define ROUNDED_DIV(a, b)
Definition: common.h:56
ThreadFrame tf
Definition: mpegpicture.h:47
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:1573
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333
#define U(x)
Definition: vp56_arith.h:37
#define src
Definition: vp8dsp.c:254
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
#define FF_IDCT_XVID
Definition: avcodec.h:1741
int16_t * dc_val[3]
used for MPEG-4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:187
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:178
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:816
uint8_t * mbskip_table
Definition: mpegpicture.h:59
#define QUANT_MATRIX_EXT_ID
Definition: mpeg4video.h:69
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:185
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:195
int chroma_y_shift
Definition: mpegvideo.h:487
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:405
#define STATIC_SPRITE
Definition: mpeg4video.h:55
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
#define AVERROR(e)
Definition: error.h:43
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:37
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
ERContext er
Definition: mpegvideo.h:566
const uint8_t * code
Definition: spdifenc.c:413
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
const char * r
Definition: vf_curves.c:114
unsigned int pos
Definition: spdifenc.c:412
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:606
#define SIMPLE_VO_TYPE
Definition: mpeg4video.h:38
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:38
#define FF_BUG_NO_PADDING
Definition: avcodec.h:1568
#define MB_TYPE_GMC
Definition: mpegutils.h:61
#define FF_DEBUG_BUGS
Definition: avcodec.h:1632
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:71
int(* decode_mb)(struct MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.h:510
const char * name
Name of the codec implementation.
Definition: codec.h:197
#define IS_SKIP(a)
Definition: mpegutils.h:81
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:400
uint8_t bits
Definition: vp3data.h:202
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:401
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:406
#define SET_QPEL_FUNC(postfix1, postfix2)
GetBitContext gb
Definition: mpegvideo.h:448
#define CLOSE_READER(name, gb)
Definition: get_bits.h:149
#define FFMAX(a, b)
Definition: common.h:94
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:106
Definition: vlc.h:26
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2312
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:193
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:227
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:356
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideodata.c:84
int dct_precision
number of bits to represent the fractional part of time (encoder only)
Definition: mpegvideo.h:385
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:68
common internal API header
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:398
static av_cold int decode_end(AVCodecContext *avctx)
#define ADV_SIMPLE_VO_TYPE
Definition: mpeg4video.h:46
const uint8_t ff_mpeg4_DCtab_lum[13][2]
Definition: mpeg4data.h:35
uint8_t ff_mpeg4_static_rl_table_store[3][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg4video.c:28
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:421
#define CHROMA_422
Definition: mpegvideo.h:484
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: codec.h:44
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
int progressive_frame
Definition: mpegvideo.h:489
#define CONFIG_MPEG4_DECODER
Definition: config.h:859
int top_field_first
Definition: mpegvideo.h:466
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:57
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1659
#define FFMIN(a, b)
Definition: common.h:96
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
#define IS_DIRECT(a)
Definition: mpegutils.h:84
static VLC dc_lum
Definition: mpeg4videodec.c:53
#define width
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1733
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
uint8_t w
Definition: llviddspenc.c:38
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
#define GRAY_SHAPE
Definition: mpeg4video.h:36
#define FF_PROFILE_UNKNOWN
Definition: avcodec.h:1864
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:738
#define ER_DC_END
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:737
int alternate_scan
Definition: mpegvideo.h:471
AVCodec ff_mpeg4_decoder
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:417
int size_in_bits
Definition: get_bits.h:68
int32_t
AVFormatContext * ctx
Definition: movenc.c:48
int use_intra_dc_vlc
Definition: mpeg4video.h:98
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:1140
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define s(width, name)
Definition: cbs_vp9.c:257
int level
level
Definition: avcodec.h:1986
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:199
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 AV_RL32
Definition: intreadwrite.h:146
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:86
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:96
int vol_control_parameters
does the stream contain the low_delay flag, used to work around buggy encoders.
Definition: mpeg4video.h:113
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:348
#define FRAME_SKIPPED
Return value for header parsers if frame is not coded.
Definition: mpegutils.h:34
uint8_t * mbintra_table
used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
Definition: mpegvideo.h:198
#define MB_TYPE_INTERLACED
Definition: mpegutils.h:58
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:1570
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:491
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
#define VOT_VIDEO_ID
Definition: mpeg4video.h:48
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:46
#define FF_BUG_UMP4
Definition: avcodec.h:1567
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:293
#define av_log2
Definition: intmath.h:83
the normal 2^n-1 "JPEG" YUV ranges
Definition: pixfmt.h:535
static av_cold int init_studio_vlcs(Mpeg4DecContext *ctx)
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define MB_TYPE_8x8
Definition: mpegutils.h:57
static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n)
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:436
int frame_pred_frame_dct
Definition: mpegvideo.h:465
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
decode partition C of one MB.
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:263
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
uint16_t inter_matrix[64]
Definition: mpegvideo.h:302
int64_t last_non_b_time
Definition: mpegvideo.h:391
#define FF_ASPECT_EXTENDED
Definition: h263.h:30
static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
BlockDSPContext bdsp
Definition: mpegvideo.h:226
int debug
debug
Definition: avcodec.h:1615
static const int16_t alpha[]
Definition: ilbcdata.h:55
main external API structure.
Definition: avcodec.h:526
int cplx_estimation_trash_i
Definition: mpeg4video.h:114
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define FASTDIV(a, b)
Definition: mathops.h:202
long long int64_t
Definition: coverity.c:34
#define RSHIFT(a, b)
Definition: common.h:54
ScanTable intra_scantable
Definition: mpegvideo.h:91
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:100
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
#define OPEN_READER(name, gb)
Definition: get_bits.h:138
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:39
#define SLICE_END
end marker found
Definition: mpegvideo.h:518
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:404
int showed_packed_warning
flag for having shown the warning about invalid Divx B-frames
Definition: mpeg4video.h:110
int progressive_sequence
Definition: mpegvideo.h:456
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:538
Describe the class of an AVClass context structure.
Definition: log.h:67
ScanTable intra_h_scantable
Definition: mpegvideo.h:92
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
static const AVProfile profiles[]
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:199
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:1154
Rational number (pair of numerator and denominator).
Definition: rational.h:58
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:1147
static void reset_studio_dc_predictors(MpegEncContext *s)
#define VOT_STILL_TEXTURE_ID
Definition: mpeg4video.h:49
int context_initialized
Definition: mpegvideo.h:124
#define GET_CACHE(name, gb)
Definition: get_bits.h:215
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:1672
RLTable ff_h263_rl_inter
Definition: h263data.c:161
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
#define s1
Definition: regdef.h:38
static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:180
const int16_t ff_mpeg4_default_intra_matrix[64]
Definition: mpeg4data.h:337
#define ER_DC_ERROR
int f_code
forward MV resolution
Definition: mpegvideo.h:238
#define MB_TYPE_SKIP
Definition: mpegutils.h:62
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:86
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:212
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
mfxU16 profile
Definition: qsvenc.c:45
#define AV_CODEC_CAP_TRUNCATED
Definition: codec.h:51
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)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> dc
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:1565
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:105
static int64_t pts
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:398
uint16_t pb_field_time
like above, just for interlaced
Definition: mpegvideo.h:395
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:189
uint8_t level
Definition: svq3.c:210
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:276
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:131
the normal 219*2^(n-8) "MPEG" YUV ranges
Definition: pixfmt.h:534
MpegEncContext.
Definition: mpegvideo.h:81
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:183
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
int8_t * qscale_table
Definition: mpegpicture.h:50
#define MAX_RUN
Definition: rl.h:35
struct AVCodecContext * avctx
Definition: mpegvideo.h:98
uint16_t pp_field_time
Definition: mpegvideo.h:394
static int mpeg4_is_resync(Mpeg4DecContext *ctx)
check if the next stuff is a resync marker or the end.
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:212
#define VISUAL_OBJ_STARTCODE
Definition: mpeg4video.h:64
static VLC sprite_trajectory
Definition: mpeg4videodec.c:54
#define FF_BUG_AMV
Definition: avcodec.h:1569
int t_frame
time distance of first I -> B, used for interlaced B-frames
Definition: mpeg4video.h:93
VLC studio_intra_tab[12]
Definition: mpeg4video.h:118
#define MB_TYPE_L0L1
Definition: mpegutils.h:69
static const AVOption mpeg4_options[]
common internal api header.
int32_t(* block32)[12][64]
Definition: mpegvideo.h:512
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:130
if(ret< 0)
Definition: vf_mcdeint.c:279
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:60
#define TEX_VLC_BITS
Definition: dv.h:99
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
static VLC dc_chrom
Definition: mpeg4videodec.c:53
Bi-dir predicted.
Definition: avutil.h:276
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:55
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
int den
Denominator.
Definition: rational.h:60
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideodata.c:95
static const AVClass mpeg4_class
#define IS_INTRA(x, y)
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:155
void * priv_data
Definition: avcodec.h:553
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:1629
static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the next studio vop header.
#define IS_8X8(a)
Definition: mpegutils.h:89
int len
#define HWACCEL_VAAPI(codec)
Definition: hwconfig.h:73
const uint16_t ff_mpeg4_studio_dc_luma[19][2]
Definition: mpeg4data.h:377
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:357
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:508
#define CORE_STUDIO_VO_TYPE
Definition: mpeg4video.h:45
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:168
#define IS_ACPRED(a)
Definition: mpegutils.h:94
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:693
int chroma_qscale
chroma QP
Definition: mpegvideo.h:205
static const uint8_t mpeg4_block_count[4]
Definition: mpeg4video.h:125
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:270
#define av_uninit(x)
Definition: attributes.h:154
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:300
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
int16_t(* dpcm_macroblock)[3][256]
Definition: mpegvideo.h:514
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:78
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:119
ScanTable inter_scantable
if inter == intra then intra should be used to reduce the cache usage
Definition: mpegvideo.h:90
static void next_start_code_studio(GetBitContext *gb)
static int mpeg_get_qscale(MpegEncContext *s)
Definition: mpegvideo.h:764
int num_sprite_warping_points
Definition: mpeg4video.h:82
#define MV_TYPE_8X8
4 vectors (H.263, MPEG-4 4MV)
Definition: mpegvideo.h:267
int b_code
backward MV resolution for B-frames (MPEG-4)
Definition: mpegvideo.h:239
float min
#define FF_BUG_DC_CLIP
Definition: avcodec.h:1576
const uint8_t ff_mb_type_b_tab[4][2]
Definition: mpeg4data.h:332
static int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block, int n, int coded, int intra, int rvlc)
Decode a block.
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:359
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
#define MB_TYPE_L0
Definition: mpegutils.h:67
for(j=16;j >0;--j)
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
Definition: get_bits.h:415
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
Predicted.
Definition: avutil.h:275
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:37
#define GOP_STARTCODE
Definition: mpeg4video.h:63
#define VOS_STARTCODE
Definition: mpeg4video.h:61
uint16_t pb_time
time distance between the last b and p,s,i frame
Definition: mpegvideo.h:393
#define GMC_SPRITE
Definition: mpeg4video.h:56