FFmpeg  2.8.17
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mpeg4videodec.c
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1 /*
2  * MPEG4 decoder.
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define UNCHECKED_BITSTREAM_READER 1
24 
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "error_resilience.h"
28 #include "idctdsp.h"
29 #include "internal.h"
30 #include "mpegutils.h"
31 #include "mpegvideo.h"
32 #include "mpegvideodata.h"
33 #include "mpeg4video.h"
34 #include "h263.h"
35 #include "thread.h"
36 #include "xvididct.h"
37 
38 /* The defines below define the number of bits that are read at once for
39  * reading vlc values. Changing these may improve speed and data cache needs
40  * be aware though that decreasing them may need the number of stages that is
41  * passed to get_vlc* to be increased. */
42 #define SPRITE_TRAJ_VLC_BITS 6
43 #define DC_VLC_BITS 9
44 #define MB_TYPE_B_VLC_BITS 4
45 
49 
50 static const int mb_type_b_map[4] = {
55 };
56 
57 /**
58  * Predict the ac.
59  * @param n block index (0-3 are luma, 4-5 are chroma)
60  * @param dir the ac prediction direction
61  */
62 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
63 {
64  int i;
65  int16_t *ac_val, *ac_val1;
66  int8_t *const qscale_table = s->current_picture.qscale_table;
67 
68  /* find prediction */
69  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
70  ac_val1 = ac_val;
71  if (s->ac_pred) {
72  if (dir == 0) {
73  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
74  /* left prediction */
75  ac_val -= 16;
76 
77  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
78  n == 1 || n == 3) {
79  /* same qscale */
80  for (i = 1; i < 8; i++)
81  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
82  } else {
83  /* different qscale, we must rescale */
84  for (i = 1; i < 8; i++)
85  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
86  }
87  } else {
88  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
89  /* top prediction */
90  ac_val -= 16 * s->block_wrap[n];
91 
92  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
93  n == 2 || n == 3) {
94  /* same qscale */
95  for (i = 1; i < 8; i++)
96  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
97  } else {
98  /* different qscale, we must rescale */
99  for (i = 1; i < 8; i++)
100  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
101  }
102  }
103  }
104  /* left copy */
105  for (i = 1; i < 8; i++)
106  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
107 
108  /* top copy */
109  for (i = 1; i < 8; i++)
110  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
111 }
112 
113 /**
114  * check if the next stuff is a resync marker or the end.
115  * @return 0 if not
116  */
117 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
118 {
119  MpegEncContext *s = &ctx->m;
120  int bits_count = get_bits_count(&s->gb);
121  int v = show_bits(&s->gb, 16);
122 
124  return 0;
125 
126  while (v <= 0xFF) {
127  if (s->pict_type == AV_PICTURE_TYPE_B ||
128  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
129  break;
130  skip_bits(&s->gb, 8 + s->pict_type);
131  bits_count += 8 + s->pict_type;
132  v = show_bits(&s->gb, 16);
133  }
134 
135  if (bits_count + 8 >= s->gb.size_in_bits) {
136  v >>= 8;
137  v |= 0x7F >> (7 - (bits_count & 7));
138 
139  if (v == 0x7F)
140  return s->mb_num;
141  } else {
142  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
143  int len, mb_num;
144  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
145  GetBitContext gb = s->gb;
146 
147  skip_bits(&s->gb, 1);
148  align_get_bits(&s->gb);
149 
150  for (len = 0; len < 32; len++)
151  if (get_bits1(&s->gb))
152  break;
153 
154  mb_num = get_bits(&s->gb, mb_num_bits);
155  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
156  mb_num= -1;
157 
158  s->gb = gb;
159 
161  return mb_num;
162  }
163  }
164  return 0;
165 }
166 
168 {
169  MpegEncContext *s = &ctx->m;
170  int a = 2 << s->sprite_warping_accuracy;
171  int rho = 3 - s->sprite_warping_accuracy;
172  int r = 16 / a;
173  int alpha = 1;
174  int beta = 0;
175  int w = s->width;
176  int h = s->height;
177  int min_ab, i, w2, h2, w3, h3;
178  int sprite_ref[4][2];
179  int virtual_ref[2][2];
180  int64_t sprite_offset[2][2];
181  int64_t sprite_delta[2][2];
182 
183  // only true for rectangle shapes
184  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
185  { 0, s->height }, { s->width, s->height } };
186  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
187 
188  if (w <= 0 || h <= 0)
189  return AVERROR_INVALIDDATA;
190 
191  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
192  int length;
193  int x = 0, y = 0;
194 
195  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
196  if (length > 0)
197  x = get_xbits(gb, length);
198 
199  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
200  check_marker(gb, "before sprite_trajectory");
201 
202  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
203  if (length > 0)
204  y = get_xbits(gb, length);
205 
206  check_marker(gb, "after sprite_trajectory");
207  ctx->sprite_traj[i][0] = d[i][0] = x;
208  ctx->sprite_traj[i][1] = d[i][1] = y;
209  }
210  for (; i < 4; i++)
211  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
212 
213  while ((1 << alpha) < w)
214  alpha++;
215  while ((1 << beta) < h)
216  beta++; /* typo in the mpeg4 std for the definition of w' and h' */
217  w2 = 1 << alpha;
218  h2 = 1 << beta;
219 
220  // Note, the 4th point isn't used for GMC
221  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
222  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
223  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
224  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
225  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
226  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
227  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
228  } else {
229  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
230  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
231  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
232  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
233  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
234  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
235  }
236  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
237  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
238 
239  /* this is mostly identical to the mpeg4 std (and is totally unreadable
240  * because of that...). Perhaps it should be reordered to be more readable.
241  * The idea behind this virtual_ref mess is to be able to use shifts later
242  * per pixel instead of divides so the distance between points is converted
243  * from w&h based to w2&h2 based which are of the 2^x form. */
244  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
245  ROUNDED_DIV(((w - w2) *
246  (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
247  w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
248  virtual_ref[0][1] = 16 * vop_ref[0][1] +
249  ROUNDED_DIV(((w - w2) *
250  (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
251  w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
252  virtual_ref[1][0] = 16 * vop_ref[0][0] +
253  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
254  h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
255  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
256  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
257  h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
258 
259  switch (ctx->num_sprite_warping_points) {
260  case 0:
261  sprite_offset[0][0] =
262  sprite_offset[0][1] =
263  sprite_offset[1][0] =
264  sprite_offset[1][1] = 0;
265  sprite_delta[0][0] = a;
266  sprite_delta[0][1] =
267  sprite_delta[1][0] = 0;
268  sprite_delta[1][1] = a;
269  ctx->sprite_shift[0] =
270  ctx->sprite_shift[1] = 0;
271  break;
272  case 1: // GMC only
273  sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
274  sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
275  sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
276  a * (vop_ref[0][0] / 2);
277  sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
278  a * (vop_ref[0][1] / 2);
279  sprite_delta[0][0] = a;
280  sprite_delta[0][1] =
281  sprite_delta[1][0] = 0;
282  sprite_delta[1][1] = a;
283  ctx->sprite_shift[0] =
284  ctx->sprite_shift[1] = 0;
285  break;
286  case 2:
287  sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
288  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
289  ((int64_t) -vop_ref[0][0]) +
290  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
291  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
292  sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
293  ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
294  ((int64_t) -vop_ref[0][0]) +
295  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
296  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
297  sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
298  ((int64_t)-2 * vop_ref[0][0] + 1) +
299  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
300  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
301  (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
302  sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
303  ((int64_t)-2 * vop_ref[0][0] + 1) +
304  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
305  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
306  (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
307  sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
308  sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
309  sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
310  sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
311 
312  ctx->sprite_shift[0] = alpha + rho;
313  ctx->sprite_shift[1] = alpha + rho + 2;
314  break;
315  case 3:
316  min_ab = FFMIN(alpha, beta);
317  w3 = w2 >> min_ab;
318  h3 = h2 >> min_ab;
319  sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
320  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
321  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
322  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
323  sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
324  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
325  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
326  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
327  sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
328  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
329  (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
330  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
331  sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
332  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
333  (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
334  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
335  sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
336  sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
337  sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
338  sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
339 
340  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
341  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
342  break;
343  }
344  /* try to simplify the situation */
345  if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
346  sprite_delta[0][1] == 0 &&
347  sprite_delta[1][0] == 0 &&
348  sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
349  sprite_offset[0][0] >>= ctx->sprite_shift[0];
350  sprite_offset[0][1] >>= ctx->sprite_shift[0];
351  sprite_offset[1][0] >>= ctx->sprite_shift[1];
352  sprite_offset[1][1] >>= ctx->sprite_shift[1];
353  sprite_delta[0][0] = a;
354  sprite_delta[0][1] = 0;
355  sprite_delta[1][0] = 0;
356  sprite_delta[1][1] = a;
357  ctx->sprite_shift[0] = 0;
358  ctx->sprite_shift[1] = 0;
360  } else {
361  int shift_y = 16 - ctx->sprite_shift[0];
362  int shift_c = 16 - ctx->sprite_shift[1];
363 
364  for (i = 0; i < 2; i++) {
365  if (shift_c < 0 || shift_y < 0 ||
366  FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
367  FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
368  FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
369  FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
370  ) {
371  avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
372  goto overflow;
373  }
374  }
375 
376  for (i = 0; i < 2; i++) {
377  sprite_offset[0][i] *= 1 << shift_y;
378  sprite_offset[1][i] *= 1 << shift_c;
379  sprite_delta[0][i] *= 1 << shift_y;
380  sprite_delta[1][i] *= 1 << shift_y;
381  ctx->sprite_shift[i] = 16;
382 
383  }
384  for (i = 0; i < 2; i++) {
385  int64_t sd[2] = {
386  sprite_delta[i][0] - a * (1LL<<16),
387  sprite_delta[i][1] - a * (1LL<<16)
388  };
389 
390  if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
391  llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
392  llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
393  llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
394  llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
395  llabs(sd[0]) >= INT_MAX ||
396  llabs(sd[1]) >= INT_MAX ||
397  llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
398  llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
399  llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
400  ) {
401  avpriv_request_sample(s->avctx, "Overflow on sprite points");
402  goto overflow;
403  }
404  }
406  }
407 
408  for (i = 0; i < 4; i++) {
409  s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
410  s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
411  }
412 
413  return 0;
414 overflow:
415  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
416  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
417  return AVERROR_PATCHWELCOME;
418 }
419 
421  int len = FFMIN(ctx->time_increment_bits + 3, 15);
422 
423  get_bits(gb, len);
424  if (get_bits1(gb))
425  get_bits(gb, len);
426  check_marker(gb, "after new_pred");
427 
428  return 0;
429 }
430 
431 /**
432  * Decode the next video packet.
433  * @return <0 if something went wrong
434  */
436 {
437  MpegEncContext *s = &ctx->m;
438 
439  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
440  int header_extension = 0, mb_num, len;
441 
442  /* is there enough space left for a video packet + header */
443  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
444  return -1;
445 
446  for (len = 0; len < 32; len++)
447  if (get_bits1(&s->gb))
448  break;
449 
451  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
452  return -1;
453  }
454 
455  if (ctx->shape != RECT_SHAPE) {
456  header_extension = get_bits1(&s->gb);
457  // FIXME more stuff here
458  }
459 
460  mb_num = get_bits(&s->gb, mb_num_bits);
461  if (mb_num >= s->mb_num || !mb_num) {
463  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
464  return -1;
465  }
466 
467  s->mb_x = mb_num % s->mb_width;
468  s->mb_y = mb_num / s->mb_width;
469 
470  if (ctx->shape != BIN_ONLY_SHAPE) {
471  int qscale = get_bits(&s->gb, s->quant_precision);
472  if (qscale)
473  s->chroma_qscale = s->qscale = qscale;
474  }
475 
476  if (ctx->shape == RECT_SHAPE)
477  header_extension = get_bits1(&s->gb);
478 
479  if (header_extension) {
480  int time_incr = 0;
481 
482  while (get_bits1(&s->gb) != 0)
483  time_incr++;
484 
485  check_marker(&s->gb, "before time_increment in video packed header");
486  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
487  check_marker(&s->gb, "before vop_coding_type in video packed header");
488 
489  skip_bits(&s->gb, 2); /* vop coding type */
490  // FIXME not rect stuff here
491 
492  if (ctx->shape != BIN_ONLY_SHAPE) {
493  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
494  // FIXME don't just ignore everything
495  if (s->pict_type == AV_PICTURE_TYPE_S &&
496  ctx->vol_sprite_usage == GMC_SPRITE) {
497  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
498  return AVERROR_INVALIDDATA;
499  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
500  }
501 
502  // FIXME reduced res stuff here
503 
504  if (s->pict_type != AV_PICTURE_TYPE_I) {
505  int f_code = get_bits(&s->gb, 3); /* fcode_for */
506  if (f_code == 0)
508  "Error, video packet header damaged (f_code=0)\n");
509  }
510  if (s->pict_type == AV_PICTURE_TYPE_B) {
511  int b_code = get_bits(&s->gb, 3);
512  if (b_code == 0)
514  "Error, video packet header damaged (b_code=0)\n");
515  }
516  }
517  }
518  if (ctx->new_pred)
519  decode_new_pred(ctx, &s->gb);
520 
521  return 0;
522 }
523 
524 /**
525  * Get the average motion vector for a GMC MB.
526  * @param n either 0 for the x component or 1 for y
527  * @return the average MV for a GMC MB
528  */
529 static inline int get_amv(Mpeg4DecContext *ctx, int n)
530 {
531  MpegEncContext *s = &ctx->m;
532  int x, y, mb_v, sum, dx, dy, shift;
533  int len = 1 << (s->f_code + 4);
534  const int a = s->sprite_warping_accuracy;
535 
536  if (s->workaround_bugs & FF_BUG_AMV)
537  len >>= s->quarter_sample;
538 
539  if (s->real_sprite_warping_points == 1) {
540  if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
541  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
542  else
543  sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
544  } else {
545  dx = s->sprite_delta[n][0];
546  dy = s->sprite_delta[n][1];
547  shift = ctx->sprite_shift[0];
548  if (n)
549  dy -= 1 << (shift + a + 1);
550  else
551  dx -= 1 << (shift + a + 1);
552  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16U + dy * s->mb_y * 16U;
553 
554  sum = 0;
555  for (y = 0; y < 16; y++) {
556  int v;
557 
558  v = mb_v + dy * y;
559  // FIXME optimize
560  for (x = 0; x < 16; x++) {
561  sum += v >> shift;
562  v += dx;
563  }
564  }
565  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
566  }
567 
568  if (sum < -len)
569  sum = -len;
570  else if (sum >= len)
571  sum = len - 1;
572 
573  return sum;
574 }
575 
576 /**
577  * Decode the dc value.
578  * @param n block index (0-3 are luma, 4-5 are chroma)
579  * @param dir_ptr the prediction direction will be stored here
580  * @return the quantized dc
581  */
582 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
583 {
584  int level, code;
585 
586  if (n < 4)
587  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
588  else
589  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
590 
591  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
592  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
593  return -1;
594  }
595 
596  if (code == 0) {
597  level = 0;
598  } else {
599  if (IS_3IV1) {
600  if (code == 1)
601  level = 2 * get_bits1(&s->gb) - 1;
602  else {
603  if (get_bits1(&s->gb))
604  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
605  else
606  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
607  }
608  } else {
609  level = get_xbits(&s->gb, code);
610  }
611 
612  if (code > 8) {
613  if (get_bits1(&s->gb) == 0) { /* marker */
615  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
616  return -1;
617  }
618  }
619  }
620  }
621 
622  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
623 }
624 
625 /**
626  * Decode first partition.
627  * @return number of MBs decoded or <0 if an error occurred
628  */
630 {
631  MpegEncContext *s = &ctx->m;
632  int mb_num = 0;
633  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
634 
635  /* decode first partition */
636  s->first_slice_line = 1;
637  for (; s->mb_y < s->mb_height; s->mb_y++) {
639  for (; s->mb_x < s->mb_width; s->mb_x++) {
640  const int xy = s->mb_x + s->mb_y * s->mb_stride;
641  int cbpc;
642  int dir = 0;
643 
644  mb_num++;
646  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
647  s->first_slice_line = 0;
648 
649  if (s->pict_type == AV_PICTURE_TYPE_I) {
650  int i;
651 
652  do {
653  if (show_bits_long(&s->gb, 19) == DC_MARKER)
654  return mb_num - 1;
655 
657  if (cbpc < 0) {
659  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
660  return -1;
661  }
662  } while (cbpc == 8);
663 
664  s->cbp_table[xy] = cbpc & 3;
666  s->mb_intra = 1;
667 
668  if (cbpc & 4)
669  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
670 
671  s->current_picture.qscale_table[xy] = s->qscale;
672 
673  s->mbintra_table[xy] = 1;
674  for (i = 0; i < 6; i++) {
675  int dc_pred_dir;
676  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
677  if (dc < 0) {
679  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
680  return -1;
681  }
682  dir <<= 1;
683  if (dc_pred_dir)
684  dir |= 1;
685  }
686  s->pred_dir_table[xy] = dir;
687  } else { /* P/S_TYPE */
688  int mx, my, pred_x, pred_y, bits;
689  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
690  const int stride = s->b8_stride * 2;
691 
692 try_again:
693  bits = show_bits(&s->gb, 17);
694  if (bits == MOTION_MARKER)
695  return mb_num - 1;
696 
697  skip_bits1(&s->gb);
698  if (bits & 0x10000) {
699  /* skip mb */
700  if (s->pict_type == AV_PICTURE_TYPE_S &&
701  ctx->vol_sprite_usage == GMC_SPRITE) {
703  MB_TYPE_16x16 |
704  MB_TYPE_GMC |
705  MB_TYPE_L0;
706  mx = get_amv(ctx, 0);
707  my = get_amv(ctx, 1);
708  } else {
710  MB_TYPE_16x16 |
711  MB_TYPE_L0;
712  mx = my = 0;
713  }
714  mot_val[0] =
715  mot_val[2] =
716  mot_val[0 + stride] =
717  mot_val[2 + stride] = mx;
718  mot_val[1] =
719  mot_val[3] =
720  mot_val[1 + stride] =
721  mot_val[3 + stride] = my;
722 
723  if (s->mbintra_table[xy])
725  continue;
726  }
727 
729  if (cbpc < 0) {
731  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
732  return -1;
733  }
734  if (cbpc == 20)
735  goto try_again;
736 
737  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
738 
739  s->mb_intra = ((cbpc & 4) != 0);
740 
741  if (s->mb_intra) {
743  s->mbintra_table[xy] = 1;
744  mot_val[0] =
745  mot_val[2] =
746  mot_val[0 + stride] =
747  mot_val[2 + stride] = 0;
748  mot_val[1] =
749  mot_val[3] =
750  mot_val[1 + stride] =
751  mot_val[3 + stride] = 0;
752  } else {
753  if (s->mbintra_table[xy])
755 
756  if (s->pict_type == AV_PICTURE_TYPE_S &&
757  ctx->vol_sprite_usage == GMC_SPRITE &&
758  (cbpc & 16) == 0)
759  s->mcsel = get_bits1(&s->gb);
760  else
761  s->mcsel = 0;
762 
763  if ((cbpc & 16) == 0) {
764  /* 16x16 motion prediction */
765 
766  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
767  if (!s->mcsel) {
768  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
769  if (mx >= 0xffff)
770  return -1;
771 
772  my = ff_h263_decode_motion(s, pred_y, s->f_code);
773  if (my >= 0xffff)
774  return -1;
776  MB_TYPE_L0;
777  } else {
778  mx = get_amv(ctx, 0);
779  my = get_amv(ctx, 1);
781  MB_TYPE_GMC |
782  MB_TYPE_L0;
783  }
784 
785  mot_val[0] =
786  mot_val[2] =
787  mot_val[0 + stride] =
788  mot_val[2 + stride] = mx;
789  mot_val[1] =
790  mot_val[3] =
791  mot_val[1 + stride] =
792  mot_val[3 + stride] = my;
793  } else {
794  int i;
796  MB_TYPE_L0;
797  for (i = 0; i < 4; i++) {
798  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
799  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
800  if (mx >= 0xffff)
801  return -1;
802 
803  my = ff_h263_decode_motion(s, pred_y, s->f_code);
804  if (my >= 0xffff)
805  return -1;
806  mot_val[0] = mx;
807  mot_val[1] = my;
808  }
809  }
810  }
811  }
812  }
813  s->mb_x = 0;
814  }
815 
816  return mb_num;
817 }
818 
819 /**
820  * decode second partition.
821  * @return <0 if an error occurred
822  */
823 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
824 {
825  int mb_num = 0;
826  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
827 
828  s->mb_x = s->resync_mb_x;
829  s->first_slice_line = 1;
830  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
832  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
833  const int xy = s->mb_x + s->mb_y * s->mb_stride;
834 
835  mb_num++;
837  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
838  s->first_slice_line = 0;
839 
840  if (s->pict_type == AV_PICTURE_TYPE_I) {
841  int ac_pred = get_bits1(&s->gb);
842  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
843  if (cbpy < 0) {
845  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
846  return -1;
847  }
848 
849  s->cbp_table[xy] |= cbpy << 2;
850  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
851  } else { /* P || S_TYPE */
852  if (IS_INTRA(s->current_picture.mb_type[xy])) {
853  int i;
854  int dir = 0;
855  int ac_pred = get_bits1(&s->gb);
856  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
857 
858  if (cbpy < 0) {
860  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
861  return -1;
862  }
863 
864  if (s->cbp_table[xy] & 8)
865  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
866  s->current_picture.qscale_table[xy] = s->qscale;
867 
868  for (i = 0; i < 6; i++) {
869  int dc_pred_dir;
870  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
871  if (dc < 0) {
873  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
874  return -1;
875  }
876  dir <<= 1;
877  if (dc_pred_dir)
878  dir |= 1;
879  }
880  s->cbp_table[xy] &= 3; // remove dquant
881  s->cbp_table[xy] |= cbpy << 2;
882  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
883  s->pred_dir_table[xy] = dir;
884  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
885  s->current_picture.qscale_table[xy] = s->qscale;
886  s->cbp_table[xy] = 0;
887  } else {
888  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
889 
890  if (cbpy < 0) {
892  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
893  return -1;
894  }
895 
896  if (s->cbp_table[xy] & 8)
897  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
898  s->current_picture.qscale_table[xy] = s->qscale;
899 
900  s->cbp_table[xy] &= 3; // remove dquant
901  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
902  }
903  }
904  }
905  if (mb_num >= mb_count)
906  return 0;
907  s->mb_x = 0;
908  }
909  return 0;
910 }
911 
912 /**
913  * Decode the first and second partition.
914  * @return <0 if error (and sets error type in the error_status_table)
915  */
917 {
918  MpegEncContext *s = &ctx->m;
919  int mb_num;
920  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
921  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
922 
923  mb_num = mpeg4_decode_partition_a(ctx);
924  if (mb_num <= 0) {
926  s->mb_x, s->mb_y, part_a_error);
927  return -1;
928  }
929 
930  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
931  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
933  s->mb_x, s->mb_y, part_a_error);
934  return -1;
935  }
936 
937  s->mb_num_left = mb_num;
938 
939  if (s->pict_type == AV_PICTURE_TYPE_I) {
940  while (show_bits(&s->gb, 9) == 1)
941  skip_bits(&s->gb, 9);
942  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
944  "marker missing after first I partition at %d %d\n",
945  s->mb_x, s->mb_y);
946  return -1;
947  }
948  } else {
949  while (show_bits(&s->gb, 10) == 1)
950  skip_bits(&s->gb, 10);
951  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
953  "marker missing after first P partition at %d %d\n",
954  s->mb_x, s->mb_y);
955  return -1;
956  }
957  }
959  s->mb_x - 1, s->mb_y, part_a_end);
960 
961  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
962  if (s->pict_type == AV_PICTURE_TYPE_P)
964  s->mb_x, s->mb_y, ER_DC_ERROR);
965  return -1;
966  } else {
967  if (s->pict_type == AV_PICTURE_TYPE_P)
969  s->mb_x - 1, s->mb_y, ER_DC_END);
970  }
971 
972  return 0;
973 }
974 
975 /**
976  * Decode a block.
977  * @return <0 if an error occurred
978  */
979 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
980  int n, int coded, int intra, int rvlc)
981 {
982  MpegEncContext *s = &ctx->m;
983  int level, i, last, run, qmul, qadd;
984  int av_uninit(dc_pred_dir);
985  RLTable *rl;
986  RL_VLC_ELEM *rl_vlc;
987  const uint8_t *scan_table;
988 
989  // Note intra & rvlc should be optimized away if this is inlined
990 
991  if (intra) {
992  if (ctx->use_intra_dc_vlc) {
993  /* DC coef */
994  if (s->partitioned_frame) {
995  level = s->dc_val[0][s->block_index[n]];
996  if (n < 4)
997  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
998  else
999  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1000  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1001  } else {
1002  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1003  if (level < 0)
1004  return -1;
1005  }
1006  block[0] = level;
1007  i = 0;
1008  } else {
1009  i = -1;
1010  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1011  }
1012  if (!coded)
1013  goto not_coded;
1014 
1015  if (rvlc) {
1016  rl = &ff_rvlc_rl_intra;
1017  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1018  } else {
1019  rl = &ff_mpeg4_rl_intra;
1020  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1021  }
1022  if (s->ac_pred) {
1023  if (dc_pred_dir == 0)
1024  scan_table = s->intra_v_scantable.permutated; /* left */
1025  else
1026  scan_table = s->intra_h_scantable.permutated; /* top */
1027  } else {
1028  scan_table = s->intra_scantable.permutated;
1029  }
1030  qmul = 1;
1031  qadd = 0;
1032  } else {
1033  i = -1;
1034  if (!coded) {
1035  s->block_last_index[n] = i;
1036  return 0;
1037  }
1038  if (rvlc)
1039  rl = &ff_rvlc_rl_inter;
1040  else
1041  rl = &ff_h263_rl_inter;
1042 
1043  scan_table = s->intra_scantable.permutated;
1044 
1045  if (s->mpeg_quant) {
1046  qmul = 1;
1047  qadd = 0;
1048  if (rvlc)
1049  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1050  else
1051  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1052  } else {
1053  qmul = s->qscale << 1;
1054  qadd = (s->qscale - 1) | 1;
1055  if (rvlc)
1056  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1057  else
1058  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1059  }
1060  }
1061  {
1062  OPEN_READER(re, &s->gb);
1063  for (;;) {
1064  UPDATE_CACHE(re, &s->gb);
1065  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1066  if (level == 0) {
1067  /* escape */
1068  if (rvlc) {
1069  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1071  "1. marker bit missing in rvlc esc\n");
1072  return -1;
1073  }
1074  SKIP_CACHE(re, &s->gb, 1);
1075 
1076  last = SHOW_UBITS(re, &s->gb, 1);
1077  SKIP_CACHE(re, &s->gb, 1);
1078  run = SHOW_UBITS(re, &s->gb, 6);
1079  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1080  UPDATE_CACHE(re, &s->gb);
1081 
1082  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1084  "2. marker bit missing in rvlc esc\n");
1085  return -1;
1086  }
1087  SKIP_CACHE(re, &s->gb, 1);
1088 
1089  level = SHOW_UBITS(re, &s->gb, 11);
1090  SKIP_CACHE(re, &s->gb, 11);
1091 
1092  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1093  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1094  return -1;
1095  }
1096  SKIP_CACHE(re, &s->gb, 5);
1097 
1098  level = level * qmul + qadd;
1099  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1100  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1101 
1102  i += run + 1;
1103  if (last)
1104  i += 192;
1105  } else {
1106  int cache;
1107  cache = GET_CACHE(re, &s->gb);
1108 
1109  if (IS_3IV1)
1110  cache ^= 0xC0000000;
1111 
1112  if (cache & 0x80000000) {
1113  if (cache & 0x40000000) {
1114  /* third escape */
1115  SKIP_CACHE(re, &s->gb, 2);
1116  last = SHOW_UBITS(re, &s->gb, 1);
1117  SKIP_CACHE(re, &s->gb, 1);
1118  run = SHOW_UBITS(re, &s->gb, 6);
1119  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1120  UPDATE_CACHE(re, &s->gb);
1121 
1122  if (IS_3IV1) {
1123  level = SHOW_SBITS(re, &s->gb, 12);
1124  LAST_SKIP_BITS(re, &s->gb, 12);
1125  } else {
1126  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1128  "1. marker bit missing in 3. esc\n");
1129  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1130  return -1;
1131  }
1132  SKIP_CACHE(re, &s->gb, 1);
1133 
1134  level = SHOW_SBITS(re, &s->gb, 12);
1135  SKIP_CACHE(re, &s->gb, 12);
1136 
1137  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1139  "2. marker bit missing in 3. esc\n");
1140  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1141  return -1;
1142  }
1143 
1144  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1145  }
1146 
1147 #if 0
1148  if (s->error_recognition >= FF_ER_COMPLIANT) {
1149  const int abs_level= FFABS(level);
1150  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1151  const int run1= run - rl->max_run[last][abs_level] - 1;
1152  if (abs_level <= rl->max_level[last][run]) {
1153  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1154  return -1;
1155  }
1156  if (s->error_recognition > FF_ER_COMPLIANT) {
1157  if (abs_level <= rl->max_level[last][run]*2) {
1158  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1159  return -1;
1160  }
1161  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1162  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1163  return -1;
1164  }
1165  }
1166  }
1167  }
1168 #endif
1169  if (level > 0)
1170  level = level * qmul + qadd;
1171  else
1172  level = level * qmul - qadd;
1173 
1174  if ((unsigned)(level + 2048) > 4095) {
1176  if (level > 2560 || level < -2560) {
1178  "|level| overflow in 3. esc, qp=%d\n",
1179  s->qscale);
1180  return -1;
1181  }
1182  }
1183  level = level < 0 ? -2048 : 2047;
1184  }
1185 
1186  i += run + 1;
1187  if (last)
1188  i += 192;
1189  } else {
1190  /* second escape */
1191  SKIP_BITS(re, &s->gb, 2);
1192  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1193  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1194  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1195  LAST_SKIP_BITS(re, &s->gb, 1);
1196  }
1197  } else {
1198  /* first escape */
1199  SKIP_BITS(re, &s->gb, 1);
1200  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1201  i += run;
1202  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1203  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1204  LAST_SKIP_BITS(re, &s->gb, 1);
1205  }
1206  }
1207  } else {
1208  i += run;
1209  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1210  LAST_SKIP_BITS(re, &s->gb, 1);
1211  }
1212  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1213  if (i > 62) {
1214  i -= 192;
1215  if (i & (~63)) {
1217  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1218  return -1;
1219  }
1220 
1221  block[scan_table[i]] = level;
1222  break;
1223  }
1224 
1225  block[scan_table[i]] = level;
1226  }
1227  CLOSE_READER(re, &s->gb);
1228  }
1229 
1230 not_coded:
1231  if (intra) {
1232  if (!ctx->use_intra_dc_vlc) {
1233  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1234 
1235  i -= i >> 31; // if (i == -1) i = 0;
1236  }
1237 
1238  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1239  if (s->ac_pred)
1240  i = 63; // FIXME not optimal
1241  }
1242  s->block_last_index[n] = i;
1243  return 0;
1244 }
1245 
1246 /**
1247  * decode partition C of one MB.
1248  * @return <0 if an error occurred
1249  */
1251 {
1252  Mpeg4DecContext *ctx = s->avctx->priv_data;
1253  int cbp, mb_type;
1254  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1255 
1256  av_assert2(s == (void*)ctx);
1257 
1258  mb_type = s->current_picture.mb_type[xy];
1259  cbp = s->cbp_table[xy];
1260 
1261  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1262 
1263  if (s->current_picture.qscale_table[xy] != s->qscale)
1265 
1266  if (s->pict_type == AV_PICTURE_TYPE_P ||
1267  s->pict_type == AV_PICTURE_TYPE_S) {
1268  int i;
1269  for (i = 0; i < 4; i++) {
1270  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1271  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1272  }
1273  s->mb_intra = IS_INTRA(mb_type);
1274 
1275  if (IS_SKIP(mb_type)) {
1276  /* skip mb */
1277  for (i = 0; i < 6; i++)
1278  s->block_last_index[i] = -1;
1279  s->mv_dir = MV_DIR_FORWARD;
1280  s->mv_type = MV_TYPE_16X16;
1282  && ctx->vol_sprite_usage == GMC_SPRITE) {
1283  s->mcsel = 1;
1284  s->mb_skipped = 0;
1285  } else {
1286  s->mcsel = 0;
1287  s->mb_skipped = 1;
1288  }
1289  } else if (s->mb_intra) {
1291  } else if (!s->mb_intra) {
1292  // s->mcsel = 0; // FIXME do we need to init that?
1293 
1294  s->mv_dir = MV_DIR_FORWARD;
1295  if (IS_8X8(mb_type)) {
1296  s->mv_type = MV_TYPE_8X8;
1297  } else {
1298  s->mv_type = MV_TYPE_16X16;
1299  }
1300  }
1301  } else { /* I-Frame */
1302  s->mb_intra = 1;
1304  }
1305 
1306  if (!IS_SKIP(mb_type)) {
1307  int i;
1308  s->bdsp.clear_blocks(s->block[0]);
1309  /* decode each block */
1310  for (i = 0; i < 6; i++) {
1311  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1313  "texture corrupted at %d %d %d\n",
1314  s->mb_x, s->mb_y, s->mb_intra);
1315  return -1;
1316  }
1317  cbp += cbp;
1318  }
1319  }
1320 
1321  /* per-MB end of slice check */
1322  if (--s->mb_num_left <= 0) {
1323  if (mpeg4_is_resync(ctx))
1324  return SLICE_END;
1325  else
1326  return SLICE_NOEND;
1327  } else {
1328  if (mpeg4_is_resync(ctx)) {
1329  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1330  if (s->cbp_table[xy + delta])
1331  return SLICE_END;
1332  }
1333  return SLICE_OK;
1334  }
1335 }
1336 
1337 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1338 {
1339  Mpeg4DecContext *ctx = s->avctx->priv_data;
1340  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1341  int16_t *mot_val;
1342  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1343  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1344 
1345  av_assert2(s == (void*)ctx);
1346  av_assert2(s->h263_pred);
1347 
1348  if (s->pict_type == AV_PICTURE_TYPE_P ||
1349  s->pict_type == AV_PICTURE_TYPE_S) {
1350  do {
1351  if (get_bits1(&s->gb)) {
1352  /* skip mb */
1353  s->mb_intra = 0;
1354  for (i = 0; i < 6; i++)
1355  s->block_last_index[i] = -1;
1356  s->mv_dir = MV_DIR_FORWARD;
1357  s->mv_type = MV_TYPE_16X16;
1358  if (s->pict_type == AV_PICTURE_TYPE_S &&
1359  ctx->vol_sprite_usage == GMC_SPRITE) {
1361  MB_TYPE_GMC |
1362  MB_TYPE_16x16 |
1363  MB_TYPE_L0;
1364  s->mcsel = 1;
1365  s->mv[0][0][0] = get_amv(ctx, 0);
1366  s->mv[0][0][1] = get_amv(ctx, 1);
1367  s->mb_skipped = 0;
1368  } else {
1370  MB_TYPE_16x16 |
1371  MB_TYPE_L0;
1372  s->mcsel = 0;
1373  s->mv[0][0][0] = 0;
1374  s->mv[0][0][1] = 0;
1375  s->mb_skipped = 1;
1376  }
1377  goto end;
1378  }
1380  if (cbpc < 0) {
1382  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1383  return -1;
1384  }
1385  } while (cbpc == 20);
1386 
1387  s->bdsp.clear_blocks(s->block[0]);
1388  dquant = cbpc & 8;
1389  s->mb_intra = ((cbpc & 4) != 0);
1390  if (s->mb_intra)
1391  goto intra;
1392 
1393  if (s->pict_type == AV_PICTURE_TYPE_S &&
1394  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1395  s->mcsel = get_bits1(&s->gb);
1396  else
1397  s->mcsel = 0;
1398  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1399  if (cbpy < 0) {
1401  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1402  return AVERROR_INVALIDDATA;
1403  }
1404 
1405  cbp = (cbpc & 3) | (cbpy << 2);
1406  if (dquant)
1407  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1408  if ((!s->progressive_sequence) &&
1409  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1410  s->interlaced_dct = get_bits1(&s->gb);
1411 
1412  s->mv_dir = MV_DIR_FORWARD;
1413  if ((cbpc & 16) == 0) {
1414  if (s->mcsel) {
1416  MB_TYPE_16x16 |
1417  MB_TYPE_L0;
1418  /* 16x16 global motion prediction */
1419  s->mv_type = MV_TYPE_16X16;
1420  mx = get_amv(ctx, 0);
1421  my = get_amv(ctx, 1);
1422  s->mv[0][0][0] = mx;
1423  s->mv[0][0][1] = my;
1424  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1426  MB_TYPE_L0 |
1428  /* 16x8 field motion prediction */
1429  s->mv_type = MV_TYPE_FIELD;
1430 
1431  s->field_select[0][0] = get_bits1(&s->gb);
1432  s->field_select[0][1] = get_bits1(&s->gb);
1433 
1434  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1435 
1436  for (i = 0; i < 2; i++) {
1437  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1438  if (mx >= 0xffff)
1439  return -1;
1440 
1441  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1442  if (my >= 0xffff)
1443  return -1;
1444 
1445  s->mv[0][i][0] = mx;
1446  s->mv[0][i][1] = my;
1447  }
1448  } else {
1450  /* 16x16 motion prediction */
1451  s->mv_type = MV_TYPE_16X16;
1452  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1453  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1454 
1455  if (mx >= 0xffff)
1456  return -1;
1457 
1458  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1459 
1460  if (my >= 0xffff)
1461  return -1;
1462  s->mv[0][0][0] = mx;
1463  s->mv[0][0][1] = my;
1464  }
1465  } else {
1467  s->mv_type = MV_TYPE_8X8;
1468  for (i = 0; i < 4; i++) {
1469  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1470  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1471  if (mx >= 0xffff)
1472  return -1;
1473 
1474  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1475  if (my >= 0xffff)
1476  return -1;
1477  s->mv[0][i][0] = mx;
1478  s->mv[0][i][1] = my;
1479  mot_val[0] = mx;
1480  mot_val[1] = my;
1481  }
1482  }
1483  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1484  int modb1; // first bit of modb
1485  int modb2; // second bit of modb
1486  int mb_type;
1487 
1488  s->mb_intra = 0; // B-frames never contain intra blocks
1489  s->mcsel = 0; // ... true gmc blocks
1490 
1491  if (s->mb_x == 0) {
1492  for (i = 0; i < 2; i++) {
1493  s->last_mv[i][0][0] =
1494  s->last_mv[i][0][1] =
1495  s->last_mv[i][1][0] =
1496  s->last_mv[i][1][1] = 0;
1497  }
1498 
1500  }
1501 
1502  /* if we skipped it in the future P Frame than skip it now too */
1503  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1504 
1505  if (s->mb_skipped) {
1506  /* skip mb */
1507  for (i = 0; i < 6; i++)
1508  s->block_last_index[i] = -1;
1509 
1510  s->mv_dir = MV_DIR_FORWARD;
1511  s->mv_type = MV_TYPE_16X16;
1512  s->mv[0][0][0] =
1513  s->mv[0][0][1] =
1514  s->mv[1][0][0] =
1515  s->mv[1][0][1] = 0;
1517  MB_TYPE_16x16 |
1518  MB_TYPE_L0;
1519  goto end;
1520  }
1521 
1522  modb1 = get_bits1(&s->gb);
1523  if (modb1) {
1524  // like MB_TYPE_B_DIRECT but no vectors coded
1526  cbp = 0;
1527  } else {
1528  modb2 = get_bits1(&s->gb);
1529  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1530  if (mb_type < 0) {
1531  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1532  return -1;
1533  }
1534  mb_type = mb_type_b_map[mb_type];
1535  if (modb2) {
1536  cbp = 0;
1537  } else {
1538  s->bdsp.clear_blocks(s->block[0]);
1539  cbp = get_bits(&s->gb, 6);
1540  }
1541 
1542  if ((!IS_DIRECT(mb_type)) && cbp) {
1543  if (get_bits1(&s->gb))
1544  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1545  }
1546 
1547  if (!s->progressive_sequence) {
1548  if (cbp)
1549  s->interlaced_dct = get_bits1(&s->gb);
1550 
1551  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1552  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1553  mb_type &= ~MB_TYPE_16x16;
1554 
1555  if (USES_LIST(mb_type, 0)) {
1556  s->field_select[0][0] = get_bits1(&s->gb);
1557  s->field_select[0][1] = get_bits1(&s->gb);
1558  }
1559  if (USES_LIST(mb_type, 1)) {
1560  s->field_select[1][0] = get_bits1(&s->gb);
1561  s->field_select[1][1] = get_bits1(&s->gb);
1562  }
1563  }
1564  }
1565 
1566  s->mv_dir = 0;
1567  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1568  s->mv_type = MV_TYPE_16X16;
1569 
1570  if (USES_LIST(mb_type, 0)) {
1571  s->mv_dir = MV_DIR_FORWARD;
1572 
1573  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1574  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1575  s->last_mv[0][1][0] =
1576  s->last_mv[0][0][0] =
1577  s->mv[0][0][0] = mx;
1578  s->last_mv[0][1][1] =
1579  s->last_mv[0][0][1] =
1580  s->mv[0][0][1] = my;
1581  }
1582 
1583  if (USES_LIST(mb_type, 1)) {
1584  s->mv_dir |= MV_DIR_BACKWARD;
1585 
1586  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1587  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1588  s->last_mv[1][1][0] =
1589  s->last_mv[1][0][0] =
1590  s->mv[1][0][0] = mx;
1591  s->last_mv[1][1][1] =
1592  s->last_mv[1][0][1] =
1593  s->mv[1][0][1] = my;
1594  }
1595  } else if (!IS_DIRECT(mb_type)) {
1596  s->mv_type = MV_TYPE_FIELD;
1597 
1598  if (USES_LIST(mb_type, 0)) {
1599  s->mv_dir = MV_DIR_FORWARD;
1600 
1601  for (i = 0; i < 2; i++) {
1602  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1603  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1604  s->last_mv[0][i][0] =
1605  s->mv[0][i][0] = mx;
1606  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1607  }
1608  }
1609 
1610  if (USES_LIST(mb_type, 1)) {
1611  s->mv_dir |= MV_DIR_BACKWARD;
1612 
1613  for (i = 0; i < 2; i++) {
1614  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1615  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1616  s->last_mv[1][i][0] =
1617  s->mv[1][i][0] = mx;
1618  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1619  }
1620  }
1621  }
1622  }
1623 
1624  if (IS_DIRECT(mb_type)) {
1625  if (IS_SKIP(mb_type)) {
1626  mx =
1627  my = 0;
1628  } else {
1629  mx = ff_h263_decode_motion(s, 0, 1);
1630  my = ff_h263_decode_motion(s, 0, 1);
1631  }
1632 
1634  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1635  }
1636  s->current_picture.mb_type[xy] = mb_type;
1637  } else { /* I-Frame */
1638  do {
1640  if (cbpc < 0) {
1642  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1643  return -1;
1644  }
1645  } while (cbpc == 8);
1646 
1647  dquant = cbpc & 4;
1648  s->mb_intra = 1;
1649 
1650 intra:
1651  s->ac_pred = get_bits1(&s->gb);
1652  if (s->ac_pred)
1654  else
1656 
1657  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1658  if (cbpy < 0) {
1660  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1661  return -1;
1662  }
1663  cbp = (cbpc & 3) | (cbpy << 2);
1664 
1665  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1666 
1667  if (dquant)
1668  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1669 
1670  if (!s->progressive_sequence)
1671  s->interlaced_dct = get_bits1(&s->gb);
1672 
1673  s->bdsp.clear_blocks(s->block[0]);
1674  /* decode each block */
1675  for (i = 0; i < 6; i++) {
1676  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1677  return -1;
1678  cbp += cbp;
1679  }
1680  goto end;
1681  }
1682 
1683  /* decode each block */
1684  for (i = 0; i < 6; i++) {
1685  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1686  return -1;
1687  cbp += cbp;
1688  }
1689 
1690 end:
1691  /* per-MB end of slice check */
1692  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1693  int next = mpeg4_is_resync(ctx);
1694  if (next) {
1695  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1696  return -1;
1697  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1698  return SLICE_END;
1699 
1700  if (s->pict_type == AV_PICTURE_TYPE_B) {
1701  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1703  (s->mb_x + delta >= s->mb_width)
1704  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1705  : s->mb_y, 0);
1706  if (s->next_picture.mbskip_table[xy + delta])
1707  return SLICE_OK;
1708  }
1709 
1710  return SLICE_END;
1711  }
1712  }
1713 
1714  return SLICE_OK;
1715 }
1716 
1718 {
1719  int hours, minutes, seconds;
1720 
1721  if (!show_bits(gb, 23)) {
1722  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1723  return -1;
1724  }
1725 
1726  hours = get_bits(gb, 5);
1727  minutes = get_bits(gb, 6);
1728  check_marker(gb, "in gop_header");
1729  seconds = get_bits(gb, 6);
1730 
1731  s->time_base = seconds + 60*(minutes + 60*hours);
1732 
1733  skip_bits1(gb);
1734  skip_bits1(gb);
1735 
1736  return 0;
1737 }
1738 
1740 {
1741 
1742  s->avctx->profile = get_bits(gb, 4);
1743  s->avctx->level = get_bits(gb, 4);
1744 
1745  // for Simple profile, level 0
1746  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1747  s->avctx->level = 0;
1748  }
1749 
1750  return 0;
1751 }
1752 
1754 {
1755  MpegEncContext *s = &ctx->m;
1756  int width, height, vo_ver_id;
1757 
1758  /* vol header */
1759  skip_bits(gb, 1); /* random access */
1760  s->vo_type = get_bits(gb, 8);
1761  if (get_bits1(gb) != 0) { /* is_ol_id */
1762  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1763  skip_bits(gb, 3); /* vo_priority */
1764  } else {
1765  vo_ver_id = 1;
1766  }
1767  s->aspect_ratio_info = get_bits(gb, 4);
1769  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1770  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1771  } else {
1773  }
1774 
1775  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1776  int chroma_format = get_bits(gb, 2);
1777  if (chroma_format != CHROMA_420)
1778  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1779 
1780  s->low_delay = get_bits1(gb);
1781  if (get_bits1(gb)) { /* vbv parameters */
1782  get_bits(gb, 15); /* first_half_bitrate */
1783  check_marker(gb, "after first_half_bitrate");
1784  get_bits(gb, 15); /* latter_half_bitrate */
1785  check_marker(gb, "after latter_half_bitrate");
1786  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1787  check_marker(gb, "after first_half_vbv_buffer_size");
1788  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1789  get_bits(gb, 11); /* first_half_vbv_occupancy */
1790  check_marker(gb, "after first_half_vbv_occupancy");
1791  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1792  check_marker(gb, "after latter_half_vbv_occupancy");
1793  }
1794  } else {
1795  /* is setting low delay flag only once the smartest thing to do?
1796  * low delay detection won't be overridden. */
1797  if (s->picture_number == 0)
1798  s->low_delay = 0;
1799  }
1800 
1801  ctx->shape = get_bits(gb, 2); /* vol shape */
1802  if (ctx->shape != RECT_SHAPE)
1803  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1804  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1805  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1806  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1807  }
1808 
1809  check_marker(gb, "before time_increment_resolution");
1810 
1811  s->avctx->framerate.num = get_bits(gb, 16);
1812  if (!s->avctx->framerate.num) {
1813  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1814  return AVERROR_INVALIDDATA;
1815  }
1816 
1817  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1818  if (ctx->time_increment_bits < 1)
1819  ctx->time_increment_bits = 1;
1820 
1821  check_marker(gb, "before fixed_vop_rate");
1822 
1823  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1825  else
1826  s->avctx->framerate.den = 1;
1827 
1828  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1829 
1830  ctx->t_frame = 0;
1831 
1832  if (ctx->shape != BIN_ONLY_SHAPE) {
1833  if (ctx->shape == RECT_SHAPE) {
1834  check_marker(gb, "before width");
1835  width = get_bits(gb, 13);
1836  check_marker(gb, "before height");
1837  height = get_bits(gb, 13);
1838  check_marker(gb, "after height");
1839  if (width && height && /* they should be non zero but who knows */
1840  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1841  if (s->width && s->height &&
1842  (s->width != width || s->height != height))
1843  s->context_reinit = 1;
1844  s->width = width;
1845  s->height = height;
1846  }
1847  }
1848 
1850  s->progressive_frame = get_bits1(gb) ^ 1;
1851  s->interlaced_dct = 0;
1852  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1853  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1854  "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1855  if (vo_ver_id == 1)
1856  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1857  else
1858  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1859 
1860  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1861  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1862  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1863  ctx->vol_sprite_usage == GMC_SPRITE) {
1864  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1865  skip_bits(gb, 13); // sprite_width
1866  check_marker(gb, "after sprite_width");
1867  skip_bits(gb, 13); // sprite_height
1868  check_marker(gb, "after sprite_height");
1869  skip_bits(gb, 13); // sprite_left
1870  check_marker(gb, "after sprite_left");
1871  skip_bits(gb, 13); // sprite_top
1872  check_marker(gb, "after sprite_top");
1873  }
1874  ctx->num_sprite_warping_points = get_bits(gb, 6);
1875  if (ctx->num_sprite_warping_points > 3) {
1877  "%d sprite_warping_points\n",
1879  ctx->num_sprite_warping_points = 0;
1880  return AVERROR_INVALIDDATA;
1881  }
1882  s->sprite_warping_accuracy = get_bits(gb, 2);
1884  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1885  skip_bits1(gb); // low_latency_sprite
1886  }
1887  // FIXME sadct disable bit if verid!=1 && shape not rect
1888 
1889  if (get_bits1(gb) == 1) { /* not_8_bit */
1890  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1891  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1892  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1893  if (s->quant_precision != 5)
1895  "quant precision %d\n", s->quant_precision);
1896  if (s->quant_precision<3 || s->quant_precision>9) {
1897  s->quant_precision = 5;
1898  }
1899  } else {
1900  s->quant_precision = 5;
1901  }
1902 
1903  // FIXME a bunch of grayscale shape things
1904 
1905  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1906  int i, v;
1907 
1908  /* load default matrixes */
1909  for (i = 0; i < 64; i++) {
1910  int j = s->idsp.idct_permutation[i];
1912  s->intra_matrix[j] = v;
1913  s->chroma_intra_matrix[j] = v;
1914 
1916  s->inter_matrix[j] = v;
1917  s->chroma_inter_matrix[j] = v;
1918  }
1919 
1920  /* load custom intra matrix */
1921  if (get_bits1(gb)) {
1922  int last = 0;
1923  for (i = 0; i < 64; i++) {
1924  int j;
1925  if (get_bits_left(gb) < 8) {
1926  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1927  return AVERROR_INVALIDDATA;
1928  }
1929  v = get_bits(gb, 8);
1930  if (v == 0)
1931  break;
1932 
1933  last = v;
1935  s->intra_matrix[j] = last;
1936  s->chroma_intra_matrix[j] = last;
1937  }
1938 
1939  /* replicate last value */
1940  for (; i < 64; i++) {
1941  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1942  s->intra_matrix[j] = last;
1943  s->chroma_intra_matrix[j] = last;
1944  }
1945  }
1946 
1947  /* load custom non intra matrix */
1948  if (get_bits1(gb)) {
1949  int last = 0;
1950  for (i = 0; i < 64; i++) {
1951  int j;
1952  if (get_bits_left(gb) < 8) {
1953  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1954  return AVERROR_INVALIDDATA;
1955  }
1956  v = get_bits(gb, 8);
1957  if (v == 0)
1958  break;
1959 
1960  last = v;
1962  s->inter_matrix[j] = v;
1963  s->chroma_inter_matrix[j] = v;
1964  }
1965 
1966  /* replicate last value */
1967  for (; i < 64; i++) {
1968  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1969  s->inter_matrix[j] = last;
1970  s->chroma_inter_matrix[j] = last;
1971  }
1972  }
1973 
1974  // FIXME a bunch of grayscale shape things
1975  }
1976 
1977  if (vo_ver_id != 1)
1978  s->quarter_sample = get_bits1(gb);
1979  else
1980  s->quarter_sample = 0;
1981 
1982  if (get_bits_left(gb) < 4) {
1983  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1984  return AVERROR_INVALIDDATA;
1985  }
1986 
1987  if (!get_bits1(gb)) {
1988  int pos = get_bits_count(gb);
1989  int estimation_method = get_bits(gb, 2);
1990  if (estimation_method < 2) {
1991  if (!get_bits1(gb)) {
1992  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1993  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1994  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1995  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1996  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1997  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1998  }
1999  if (!get_bits1(gb)) {
2000  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2001  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2002  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2003  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2004  }
2005  if (!check_marker(gb, "in complexity estimation part 1")) {
2006  skip_bits_long(gb, pos - get_bits_count(gb));
2007  goto no_cplx_est;
2008  }
2009  if (!get_bits1(gb)) {
2010  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2011  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2012  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2013  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2014  }
2015  if (!get_bits1(gb)) {
2016  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2017  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2018  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2019  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2020  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2021  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2022  }
2023  if (!check_marker(gb, "in complexity estimation part 2")) {
2024  skip_bits_long(gb, pos - get_bits_count(gb));
2025  goto no_cplx_est;
2026  }
2027  if (estimation_method == 1) {
2028  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2029  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2030  }
2031  } else
2033  "Invalid Complexity estimation method %d\n",
2034  estimation_method);
2035  } else {
2036 
2037 no_cplx_est:
2040  ctx->cplx_estimation_trash_b = 0;
2041  }
2042 
2043  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2044 
2045  s->data_partitioning = get_bits1(gb);
2046  if (s->data_partitioning)
2047  ctx->rvlc = get_bits1(gb);
2048 
2049  if (vo_ver_id != 1) {
2050  ctx->new_pred = get_bits1(gb);
2051  if (ctx->new_pred) {
2052  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2053  skip_bits(gb, 2); /* requested upstream message type */
2054  skip_bits1(gb); /* newpred segment type */
2055  }
2056  if (get_bits1(gb)) // reduced_res_vop
2058  "reduced resolution VOP not supported\n");
2059  } else {
2060  ctx->new_pred = 0;
2061  }
2062 
2063  ctx->scalability = get_bits1(gb);
2064 
2065  if (ctx->scalability) {
2066  GetBitContext bak = *gb;
2067  int h_sampling_factor_n;
2068  int h_sampling_factor_m;
2069  int v_sampling_factor_n;
2070  int v_sampling_factor_m;
2071 
2072  skip_bits1(gb); // hierarchy_type
2073  skip_bits(gb, 4); /* ref_layer_id */
2074  skip_bits1(gb); /* ref_layer_sampling_dir */
2075  h_sampling_factor_n = get_bits(gb, 5);
2076  h_sampling_factor_m = get_bits(gb, 5);
2077  v_sampling_factor_n = get_bits(gb, 5);
2078  v_sampling_factor_m = get_bits(gb, 5);
2079  ctx->enhancement_type = get_bits1(gb);
2080 
2081  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2082  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2083  /* illegal scalability header (VERY broken encoder),
2084  * trying to workaround */
2085  ctx->scalability = 0;
2086  *gb = bak;
2087  } else
2088  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2089 
2090  // bin shape stuff FIXME
2091  }
2092  }
2093 
2094  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2095  av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
2096  s->avctx->framerate.den, s->avctx->framerate.num,
2097  ctx->time_increment_bits,
2098  s->quant_precision,
2100  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2101  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2102  );
2103  }
2104 
2105  return 0;
2106 }
2107 
2108 /**
2109  * Decode the user data stuff in the header.
2110  * Also initializes divx/xvid/lavc_version/build.
2111  */
2113 {
2114  MpegEncContext *s = &ctx->m;
2115  char buf[256];
2116  int i;
2117  int e;
2118  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2119  char last;
2120 
2121  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2122  if (show_bits(gb, 23) == 0)
2123  break;
2124  buf[i] = get_bits(gb, 8);
2125  }
2126  buf[i] = 0;
2127 
2128  /* divx detection */
2129  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2130  if (e < 2)
2131  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2132  if (e >= 2) {
2133  ctx->divx_version = ver;
2134  ctx->divx_build = build;
2135  s->divx_packed = e == 3 && last == 'p';
2136  }
2137 
2138  /* libavcodec detection */
2139  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2140  if (e != 4)
2141  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2142  if (e != 4) {
2143  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2144  if (e > 1) {
2145  if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2147  "Unknown Lavc version string encountered, %d.%d.%d; "
2148  "clamping sub-version values to 8-bits.\n",
2149  ver, ver2, ver3);
2150  }
2151  build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2152  }
2153  }
2154  if (e != 4) {
2155  if (strcmp(buf, "ffmpeg") == 0)
2156  ctx->lavc_build = 4600;
2157  }
2158  if (e == 4)
2159  ctx->lavc_build = build;
2160 
2161  /* Xvid detection */
2162  e = sscanf(buf, "XviD%d", &build);
2163  if (e == 1)
2164  ctx->xvid_build = build;
2165 
2166  return 0;
2167 }
2168 
2170 {
2171  Mpeg4DecContext *ctx = avctx->priv_data;
2172  MpegEncContext *s = &ctx->m;
2173 
2174  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2175  if (s->codec_tag == AV_RL32("XVID") ||
2176  s->codec_tag == AV_RL32("XVIX") ||
2177  s->codec_tag == AV_RL32("RMP4") ||
2178  s->codec_tag == AV_RL32("ZMP4") ||
2179  s->codec_tag == AV_RL32("SIPP"))
2180  ctx->xvid_build = 0;
2181  }
2182 
2183  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2184  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2185  ctx->vol_control_parameters == 0)
2186  ctx->divx_version = 400; // divx 4
2187 
2188  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2189  ctx->divx_version =
2190  ctx->divx_build = -1;
2191  }
2192 
2194  if (s->codec_tag == AV_RL32("XVIX"))
2196 
2197  if (s->codec_tag == AV_RL32("UMP4"))
2199 
2200  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2202 
2203  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2205 
2206  if (ctx->xvid_build <= 3U)
2207  s->padding_bug_score = 256 * 256 * 256 * 64;
2208 
2209  if (ctx->xvid_build <= 1U)
2211 
2212  if (ctx->xvid_build <= 12U)
2214 
2215  if (ctx->xvid_build <= 32U)
2217 
2218 #define SET_QPEL_FUNC(postfix1, postfix2) \
2219  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2220  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2221  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2222 
2223  if (ctx->lavc_build < 4653U)
2225 
2226  if (ctx->lavc_build < 4655U)
2228 
2229  if (ctx->lavc_build < 4670U)
2231 
2232  if (ctx->lavc_build <= 4712U)
2234 
2235  if (ctx->divx_version >= 0)
2237  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2238  s->padding_bug_score = 256 * 256 * 256 * 64;
2239 
2240  if (ctx->divx_version < 500U)
2242 
2243  if (ctx->divx_version >= 0)
2245  }
2246 
2247  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2248  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2249  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2250  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2251  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2252  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2253  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2254 
2255  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2256  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2257  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2258  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2259  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2260  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2261  }
2262 
2263  if (avctx->debug & FF_DEBUG_BUGS)
2265  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2266  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2267  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2268 
2269  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2270  s->codec_id == AV_CODEC_ID_MPEG4 &&
2271  avctx->idct_algo == FF_IDCT_AUTO) {
2272  avctx->idct_algo = FF_IDCT_XVID;
2273  ff_mpv_idct_init(s);
2274  return 1;
2275  }
2276 
2277  return 0;
2278 }
2279 
2281 {
2282  MpegEncContext *s = &ctx->m;
2283  int time_incr, time_increment;
2284  int64_t pts;
2285 
2286  s->mcsel = 0;
2287  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2288  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2290  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2291  s->low_delay = 0;
2292  }
2293 
2295  if (s->partitioned_frame)
2297  else
2299 
2300  time_incr = 0;
2301  while (get_bits1(gb) != 0)
2302  time_incr++;
2303 
2304  check_marker(gb, "before time_increment");
2305 
2306  if (ctx->time_increment_bits == 0 ||
2307  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2309  "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);
2310 
2311  for (ctx->time_increment_bits = 1;
2312  ctx->time_increment_bits < 16;
2313  ctx->time_increment_bits++) {
2314  if (s->pict_type == AV_PICTURE_TYPE_P ||
2315  (s->pict_type == AV_PICTURE_TYPE_S &&
2316  ctx->vol_sprite_usage == GMC_SPRITE)) {
2317  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2318  break;
2319  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2320  break;
2321  }
2322 
2324  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2325  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2326  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2327  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2328  }
2329  }
2330 
2331  if (IS_3IV1)
2332  time_increment = get_bits1(gb); // FIXME investigate further
2333  else
2334  time_increment = get_bits(gb, ctx->time_increment_bits);
2335 
2336  if (s->pict_type != AV_PICTURE_TYPE_B) {
2337  s->last_time_base = s->time_base;
2338  s->time_base += time_incr;
2339  s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2340  if (s->workaround_bugs & FF_BUG_UMP4) {
2341  if (s->time < s->last_non_b_time) {
2342  /* header is not mpeg-4-compatible, broken encoder,
2343  * trying to workaround */
2344  s->time_base++;
2345  s->time += s->avctx->framerate.num;
2346  }
2347  }
2348  s->pp_time = s->time - s->last_non_b_time;
2349  s->last_non_b_time = s->time;
2350  } else {
2351  s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2352  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2353  if (s->pp_time <= s->pb_time ||
2354  s->pp_time <= s->pp_time - s->pb_time ||
2355  s->pp_time <= 0) {
2356  /* messed up order, maybe after seeking? skipping current b-frame */
2357  return FRAME_SKIPPED;
2358  }
2360 
2361  if (ctx->t_frame == 0)
2362  ctx->t_frame = s->pb_time;
2363  if (ctx->t_frame == 0)
2364  ctx->t_frame = 1; // 1/0 protection
2366  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2367  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2368  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2369  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2370  s->pb_field_time = 2;
2371  s->pp_field_time = 4;
2372  if (!s->progressive_sequence)
2373  return FRAME_SKIPPED;
2374  }
2375  }
2376 
2377  if (s->avctx->framerate.den)
2378  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2379  else
2380  pts = AV_NOPTS_VALUE;
2381  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2382 
2383  check_marker(gb, "before vop_coded");
2384 
2385  /* vop coded */
2386  if (get_bits1(gb) != 1) {
2387  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2388  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2389  return FRAME_SKIPPED;
2390  }
2391  if (ctx->new_pred)
2392  decode_new_pred(ctx, gb);
2393 
2394  if (ctx->shape != BIN_ONLY_SHAPE &&
2395  (s->pict_type == AV_PICTURE_TYPE_P ||
2396  (s->pict_type == AV_PICTURE_TYPE_S &&
2397  ctx->vol_sprite_usage == GMC_SPRITE))) {
2398  /* rounding type for motion estimation */
2399  s->no_rounding = get_bits1(gb);
2400  } else {
2401  s->no_rounding = 0;
2402  }
2403  // FIXME reduced res stuff
2404 
2405  if (ctx->shape != RECT_SHAPE) {
2406  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2407  skip_bits(gb, 13); /* width */
2408  check_marker(gb, "after width");
2409  skip_bits(gb, 13); /* height */
2410  check_marker(gb, "after height");
2411  skip_bits(gb, 13); /* hor_spat_ref */
2412  check_marker(gb, "after hor_spat_ref");
2413  skip_bits(gb, 13); /* ver_spat_ref */
2414  }
2415  skip_bits1(gb); /* change_CR_disable */
2416 
2417  if (get_bits1(gb) != 0)
2418  skip_bits(gb, 8); /* constant_alpha_value */
2419  }
2420 
2421  // FIXME complexity estimation stuff
2422 
2423  if (ctx->shape != BIN_ONLY_SHAPE) {
2425  if (s->pict_type != AV_PICTURE_TYPE_I)
2427  if (s->pict_type == AV_PICTURE_TYPE_B)
2429 
2430  if (get_bits_left(gb) < 3) {
2431  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2432  return AVERROR_INVALIDDATA;
2433  }
2435  if (!s->progressive_sequence) {
2436  s->top_field_first = get_bits1(gb);
2437  s->alternate_scan = get_bits1(gb);
2438  } else
2439  s->alternate_scan = 0;
2440  }
2441 
2442  if (s->alternate_scan) {
2447  } else {
2452  }
2453 
2454  if (s->pict_type == AV_PICTURE_TYPE_S) {
2455  if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2456  ctx->vol_sprite_usage == GMC_SPRITE)) {
2457  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2458  return AVERROR_INVALIDDATA;
2459  if (ctx->sprite_brightness_change)
2461  "sprite_brightness_change not supported\n");
2462  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2463  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2464  } else {
2465  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2466  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2467  }
2468  }
2469 
2470  if (ctx->shape != BIN_ONLY_SHAPE) {
2471  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2472  if (s->qscale == 0) {
2474  "Error, header damaged or not MPEG4 header (qscale=0)\n");
2475  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2476  }
2477 
2478  if (s->pict_type != AV_PICTURE_TYPE_I) {
2479  s->f_code = get_bits(gb, 3); /* fcode_for */
2480  if (s->f_code == 0) {
2482  "Error, header damaged or not MPEG4 header (f_code=0)\n");
2483  s->f_code = 1;
2484  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2485  }
2486  } else
2487  s->f_code = 1;
2488 
2489  if (s->pict_type == AV_PICTURE_TYPE_B) {
2490  s->b_code = get_bits(gb, 3);
2491  if (s->b_code == 0) {
2493  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2494  s->b_code=1;
2495  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2496  }
2497  } else
2498  s->b_code = 1;
2499 
2500  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2502  "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",
2503  s->qscale, s->f_code, s->b_code,
2504  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")),
2506  s->top_field_first, s->quarter_sample ? "q" : "h",
2509  1 - s->no_rounding, s->vo_type,
2510  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2513  s->time,
2514  time_increment
2515  );
2516  }
2517 
2518  if (!ctx->scalability) {
2519  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2520  skip_bits1(gb); // vop shape coding type
2521  } else {
2522  if (ctx->enhancement_type) {
2523  int load_backward_shape = get_bits1(gb);
2524  if (load_backward_shape)
2526  "load backward shape isn't supported\n");
2527  }
2528  skip_bits(gb, 2); // ref_select_code
2529  }
2530  }
2531  /* detect buggy encoders which don't set the low_delay flag
2532  * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2533  * easily (although it's buggy too) */
2534  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2535  ctx->divx_version == -1 && s->picture_number == 0) {
2537  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2538  s->low_delay = 1;
2539  }
2540 
2541  s->picture_number++; // better than pic number==0 always ;)
2542 
2543  // FIXME add short header support
2546 
2547  if (s->workaround_bugs & FF_BUG_EDGE) {
2548  s->h_edge_pos = s->width;
2549  s->v_edge_pos = s->height;
2550  }
2551  return 0;
2552 }
2553 
2554 /**
2555  * Decode mpeg4 headers.
2556  * @return <0 if no VOP found (or a damaged one)
2557  * FRAME_SKIPPED if a not coded VOP is found
2558  * 0 if a VOP is found
2559  */
2561 {
2562  MpegEncContext *s = &ctx->m;
2563  unsigned startcode, v;
2564  int ret;
2565  int vol = 0;
2566 
2567  /* search next start code */
2568  align_get_bits(gb);
2569 
2570  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2571  skip_bits(gb, 24);
2572  if (get_bits(gb, 8) == 0xF0)
2573  goto end;
2574  }
2575 
2576  startcode = 0xff;
2577  for (;;) {
2578  if (get_bits_count(gb) >= gb->size_in_bits) {
2579  if (gb->size_in_bits == 8 &&
2580  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2581  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2582  return FRAME_SKIPPED; // divx bug
2583  } else
2584  return -1; // end of stream
2585  }
2586 
2587  /* use the bits after the test */
2588  v = get_bits(gb, 8);
2589  startcode = ((startcode << 8) | v) & 0xffffffff;
2590 
2591  if ((startcode & 0xFFFFFF00) != 0x100)
2592  continue; // no startcode
2593 
2594  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2595  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2596  if (startcode <= 0x11F)
2597  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2598  else if (startcode <= 0x12F)
2599  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2600  else if (startcode <= 0x13F)
2601  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2602  else if (startcode <= 0x15F)
2603  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2604  else if (startcode <= 0x1AF)
2605  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2606  else if (startcode == 0x1B0)
2607  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2608  else if (startcode == 0x1B1)
2609  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2610  else if (startcode == 0x1B2)
2611  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2612  else if (startcode == 0x1B3)
2613  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2614  else if (startcode == 0x1B4)
2615  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2616  else if (startcode == 0x1B5)
2617  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2618  else if (startcode == 0x1B6)
2619  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2620  else if (startcode == 0x1B7)
2621  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2622  else if (startcode == 0x1B8)
2623  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2624  else if (startcode == 0x1B9)
2625  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2626  else if (startcode == 0x1BA)
2627  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2628  else if (startcode == 0x1BB)
2629  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2630  else if (startcode == 0x1BC)
2631  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2632  else if (startcode == 0x1BD)
2633  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2634  else if (startcode == 0x1BE)
2635  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2636  else if (startcode == 0x1BF)
2637  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2638  else if (startcode == 0x1C0)
2639  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2640  else if (startcode == 0x1C1)
2641  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2642  else if (startcode == 0x1C2)
2643  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2644  else if (startcode == 0x1C3)
2645  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2646  else if (startcode <= 0x1C5)
2647  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2648  else if (startcode <= 0x1FF)
2649  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2650  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2651  }
2652 
2653  if (startcode >= 0x120 && startcode <= 0x12F) {
2654  if (vol) {
2655  av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
2656  continue;
2657  }
2658  vol++;
2659  if ((ret = decode_vol_header(ctx, gb)) < 0)
2660  return ret;
2661  } else if (startcode == USER_DATA_STARTCODE) {
2662  decode_user_data(ctx, gb);
2663  } else if (startcode == GOP_STARTCODE) {
2664  mpeg4_decode_gop_header(s, gb);
2665  } else if (startcode == VOS_STARTCODE) {
2667  } else if (startcode == VOP_STARTCODE) {
2668  break;
2669  }
2670 
2671  align_get_bits(gb);
2672  startcode = 0xff;
2673  }
2674 
2675 end:
2677  s->low_delay = 1;
2678  s->avctx->has_b_frames = !s->low_delay;
2679 
2680  return decode_vop_header(ctx, gb);
2681 }
2682 
2684  static int done = 0;
2685 
2686  if (!done) {
2693  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2694  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2695  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2696  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2697  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2698  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2699  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2700  &ff_sprite_trajectory_tab[0][1], 4, 2,
2701  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2702  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2703  &ff_mb_type_b_tab[0][1], 2, 1,
2704  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2705  done = 1;
2706  }
2707 }
2708 
2709 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2710 {
2711  Mpeg4DecContext *ctx = avctx->priv_data;
2712  MpegEncContext *s = &ctx->m;
2713 
2714  /* divx 5.01+ bitstream reorder stuff */
2715  /* Since this clobbers the input buffer and hwaccel codecs still need the
2716  * data during hwaccel->end_frame we should not do this any earlier */
2717  if (s->divx_packed) {
2718  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2719  int startcode_found = 0;
2720 
2721  if (buf_size - current_pos > 7) {
2722 
2723  int i;
2724  for (i = current_pos; i < buf_size - 4; i++)
2725 
2726  if (buf[i] == 0 &&
2727  buf[i + 1] == 0 &&
2728  buf[i + 2] == 1 &&
2729  buf[i + 3] == 0xB6) {
2730  startcode_found = !(buf[i + 4] & 0x40);
2731  break;
2732  }
2733  }
2734 
2735  if (startcode_found) {
2736  if (!ctx->showed_packed_warning) {
2737  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2738  "wasteful way to store B-frames ('packed B-frames'). "
2739  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2740  ctx->showed_packed_warning = 1;
2741  }
2744  buf_size - current_pos);
2745  if (!s->bitstream_buffer) {
2746  s->bitstream_buffer_size = 0;
2747  return AVERROR(ENOMEM);
2748  }
2749  memcpy(s->bitstream_buffer, buf + current_pos,
2750  buf_size - current_pos);
2751  s->bitstream_buffer_size = buf_size - current_pos;
2752  }
2753  }
2754 
2755  return 0;
2756 }
2757 
2759  const AVCodecContext *src)
2760 {
2761  Mpeg4DecContext *s = dst->priv_data;
2762  const Mpeg4DecContext *s1 = src->priv_data;
2763  int init = s->m.context_initialized;
2764 
2765  int ret = ff_mpeg_update_thread_context(dst, src);
2766 
2767  if (ret < 0)
2768  return ret;
2769 
2770  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2771 
2772  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2773  ff_xvid_idct_init(&s->m.idsp, dst);
2774 
2775  return 0;
2776 }
2777 
2779 {
2780  Mpeg4DecContext *ctx = avctx->priv_data;
2781  MpegEncContext *s = &ctx->m;
2782  int ret;
2783 
2784  ctx->divx_version =
2785  ctx->divx_build =
2786  ctx->xvid_build =
2787  ctx->lavc_build = -1;
2788 
2789  if ((ret = ff_h263_decode_init(avctx)) < 0)
2790  return ret;
2791 
2793 
2794  s->h263_pred = 1;
2795  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2797  ctx->time_increment_bits = 4; /* default value for broken headers */
2798 
2800  avctx->internal->allocate_progress = 1;
2801 
2802  return 0;
2803 }
2804 
2806  { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2807  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2808  { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2809  { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2810  { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2811  { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2812  { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2813  { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2814  { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2815  { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2816  { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2817  { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2818  { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2819  { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2820  { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2821  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2822  { FF_PROFILE_UNKNOWN },
2823 };
2824 
2825 static const AVOption mpeg4_options[] = {
2826  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2827  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2828  {NULL}
2829 };
2830 
2831 static const AVClass mpeg4_class = {
2832  "MPEG4 Video Decoder",
2834  mpeg4_options,
2836 };
2837 
2839  .name = "mpeg4",
2840  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2841  .type = AVMEDIA_TYPE_VIDEO,
2842  .id = AV_CODEC_ID_MPEG4,
2843  .priv_data_size = sizeof(Mpeg4DecContext),
2844  .init = decode_init,
2845  .close = ff_h263_decode_end,
2850  .flush = ff_mpeg_flush,
2851  .max_lowres = 3,
2853  .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2854  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2855  .priv_class = &mpeg4_class,
2856 };
2857 
2858 
2859 #if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
2860 static const AVClass mpeg4_vdpau_class = {
2861  "MPEG4 Video VDPAU Decoder",
2863  mpeg4_options,
2865 };
2866 
2867 AVCodec ff_mpeg4_vdpau_decoder = {
2868  .name = "mpeg4_vdpau",
2869  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2870  .type = AVMEDIA_TYPE_VIDEO,
2871  .id = AV_CODEC_ID_MPEG4,
2872  .priv_data_size = sizeof(Mpeg4DecContext),
2873  .init = decode_init,
2874  .close = ff_h263_decode_end,
2878  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2879  AV_PIX_FMT_NONE },
2880  .priv_class = &mpeg4_vdpau_class,
2881 };
2882 #endif
#define FF_PROFILE_MPEG4_SCALABLE_TEXTURE
Definition: avcodec.h:3181
int last_time_base
Definition: mpegvideo.h:393
int bitstream_buffer_size
Definition: mpegvideo.h:421
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:388
uint16_t sprite_traj[4][2]
sprite trajectory points
Definition: mpeg4video.h:75
#define ff_tlog(ctx,...)
Definition: internal.h:54
IDCTDSPContext idsp
Definition: mpegvideo.h:237
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3312
#define MB_TYPE_SKIP
Definition: avcodec.h:1152
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2727
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
float v
int aspect_ratio_info
Definition: mpegvideo.h:407
int picture_number
Definition: mpegvideo.h:134
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ScanTable intra_v_scantable
Definition: mpegvideo.h:100
static int shift(int a, int b)
Definition: sonic.c:82
S(GMC)-VOP MPEG4.
Definition: avutil.h:269
RLTable ff_mpeg4_rl_intra
Definition: mpeg4data.h:109
const uint8_t ff_mpeg4_c_dc_scale_table[32]
Definition: mpeg4data.h:363
mpeg2/4 4:2:0, h264 default for 4:2:0
Definition: pixfmt.h:565
#define FF_PROFILE_MPEG4_ADVANCED_CORE
Definition: avcodec.h:3188
#define CBPY_VLC_BITS
Definition: h263.h:41
int sprite_brightness_change
Definition: mpeg4video.h:72
#define GET_RL_VLC
Definition: get_bits.h:695
AVOption.
Definition: opt.h:255
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:277
static void flush(AVCodecContext *avctx)
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:195
#define FF_PROFILE_MPEG4_MAIN
Definition: avcodec.h:3179
int sprite_warping_accuracy
Definition: mpegvideo.h:408
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG1 & B-frame MPEG4
Definition: mpegvideo.h:286
av_cold void ff_mpeg4videodec_static_init(void)
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:506
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:218
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:44
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
int resync_marker
could this stream contain resync markers
Definition: mpeg4video.h:82
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:309
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
int16_t(*[3] ac_val)[16]
used for mpeg4 AC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:201
#define avpriv_request_sample(...)
int v_edge_pos
horizontal / vertical position of the right/bottom edge (pixel replication)
Definition: mpegvideo.h:139
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:181
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:311
#define FF_PROFILE_MPEG4_ADVANCED_SIMPLE
Definition: avcodec.h:3191
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
int num
numerator
Definition: rational.h:44
uint8_t * bitstream_buffer
Definition: mpegvideo.h:420
enum AVCodecID codec_id
Definition: mpegvideo.h:119
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2916
const uint8_t * buffer
Definition: get_bits.h:56
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:62
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:1912
static av_cold int decode_init(AVCodecContext *avctx)
#define MB_TYPE_INTRA
Definition: mpegutils.h:69
#define FF_PROFILE_MPEG4_N_BIT
Definition: avcodec.h:3180
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:126
int real_sprite_warping_points
Definition: mpegvideo.h:401
mpegvideo header.
#define DC_VLC_BITS
Definition: mpeg4videodec.c:43
#define DC_MARKER
Definition: mpeg4video.h:54
uint8_t permutated[64]
Definition: idctdsp.h:31
uint8_t run
Definition: svq3.c:149
#define ER_MV_ERROR
int padding_bug_score
used to detect the VERY common padding bug in MPEG4
Definition: mpegvideo.h:416
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:503
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:140
int profile
profile
Definition: avcodec.h:3125
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2809
AVCodec.
Definition: avcodec.h:3482
int time_base
time in seconds of last I,P,S Frame
Definition: mpegvideo.h:394
RLTable.
Definition: rl.h:38
int qscale
QP.
Definition: mpegvideo.h:211
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:310
int field_select[2][2]
Definition: mpegvideo.h:285
int block_wrap[6]
Definition: mpegvideo.h:302
int quant_precision
Definition: mpegvideo.h:405
int cplx_estimation_trash_b
Definition: mpeg4video.h:107
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:2419
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1641
int vol_sprite_usage
Definition: mpeg4video.h:71
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:882
#define USES_LIST(a, list)
Definition: mpegutils.h:95
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:2810
#define USER_DATA_STARTCODE
Definition: mpeg4video.h:57
int mb_num_left
number of MBs left in this video packet (for partitioned Slices only)
Definition: mpegvideo.h:366
int64_t time
time of current frame
Definition: mpegvideo.h:395
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:46
#define FF_BUG_UMP4
Definition: avcodec.h:2802
int context_reinit
Definition: mpegvideo.h:551
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4) ...
Definition: mpegvideo.h:272
uint8_t bits
Definition: crc.c:295
uint8_t
#define av_cold
Definition: attributes.h:74
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:63
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
float delta
AVOptions.
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:481
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
const uint16_t ff_sprite_trajectory_tab[15][2]
Definition: mpeg4data.h:326
#define VOP_STARTCODE
Definition: mpeg4video.h:60
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
#define IS_3IV1
Definition: mpeg4video.h:171
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:207
Multithreading support functions.
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:780
#define FF_PROFILE_UNKNOWN
Definition: avcodec.h:3126
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:292
int enhancement_type
Definition: mpeg4video.h:87
int interlaced_dct
Definition: mpegvideo.h:484
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:187
#define CHROMA_420
Definition: mpegvideo.h:476
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
int cplx_estimation_trash_p
Definition: mpeg4video.h:106
#define RECT_SHAPE
Definition: mpeg4video.h:33
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:213
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2803
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:45
#define AV_CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:893
#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:397
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:321
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:136
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:127
int intra_dc_threshold
QP above which the ac VLC should be used for intra dc.
Definition: mpeg4video.h:92
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2254
#define MAX_LEVEL
Definition: rl.h:35
#define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE
Definition: avcodec.h:3183
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:181
#define av_log(a,...)
#define MOTION_MARKER
Definition: mpeg4video.h:53
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:681
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2790
MpegEncContext m
Definition: mpeg4video.h:66
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:402
#define ROUNDED_DIV(a, b)
Definition: common.h:55
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2808
ThreadFrame tf
Definition: mpegpicture.h:47
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2913
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333
#define U(x)
Definition: vp56_arith.h:37
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2811
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:594
int16_t * dc_val[3]
used for mpeg4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:194
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:174
static double alpha(void *priv, double x, double y)
Definition: vf_geq.c:99
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1822
uint8_t * mbskip_table
Definition: mpegpicture.h:59
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:202
av_default_item_name
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:410
#define STATIC_SPRITE
Definition: mpeg4video.h:50
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:178
ERContext er
Definition: mpegvideo.h:553
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
const char * r
Definition: vf_curves.c:107
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1607
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:40
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2797
GLsizei GLsizei * length
Definition: opengl_enc.c:115
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:71
const char * name
Name of the codec implementation.
Definition: avcodec.h:3489
#define IS_SKIP(a)
Definition: mpegutils.h:77
#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE
Definition: avcodec.h:3177
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:406
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:411
#define SET_QPEL_FUNC(postfix1, postfix2)
GetBitContext gb
Definition: mpegvideo.h:451
#define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME
Definition: avcodec.h:3185
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:502
#define CLOSE_READER(name, gb)
Definition: get_bits.h:145
#define FF_PROFILE_MPEG4_HYBRID
Definition: avcodec.h:3184
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:920
static int check_marker(GetBitContext *s, const char *msg)
Definition: get_bits.h:398
Definition: get_bits.h:64
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2759
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:189
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:217
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:363
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideodata.c:82
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:62
common internal API header
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2866
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:403
const uint8_t ff_mpeg4_DCtab_lum[13][2]
Definition: mpeg4data.h:35
uint8_t ff_mpeg4_static_rl_table_store[3][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg4video.c:28
#define MB_TYPE_GMC
Definition: avcodec.h:1151
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:99
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:409
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:851
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
int progressive_frame
Definition: mpegvideo.h:482
#define CONFIG_MPEG4_DECODER
Definition: config.h:729
int top_field_first
Definition: mpegvideo.h:467
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:50
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2900
#define FF_PROFILE_MPEG4_SIMPLE
Definition: avcodec.h:3176
#define MB_TYPE_DIRECT2
Definition: avcodec.h:1149
#define FFMIN(a, b)
Definition: common.h:92
float y
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
#define IS_DIRECT(a)
Definition: mpegutils.h:80
static VLC dc_lum
Definition: mpeg4videodec.c:46
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2971
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
#define MB_TYPE_INTERLACED
Definition: avcodec.h:1148
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
#define GRAY_SHAPE
Definition: mpeg4video.h:36
#define ER_DC_END
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:721
int alternate_scan
Definition: mpegvideo.h:471
AVCodec ff_mpeg4_decoder
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:422
int size_in_bits
Definition: get_bits.h:58
int use_intra_dc_vlc
Definition: mpeg4video.h:89
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:288
#define MB_TYPE_L0L1
Definition: avcodec.h:1159
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:68
int level
level
Definition: avcodec.h:3214
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:195
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:561
#define AV_RL32
Definition: intreadwrite.h:146
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:93
int n
Definition: avisynth_c.h:547
#define MB_TYPE_ACPRED
Definition: avcodec.h:1150
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
#define MB_TYPE_L1
Definition: avcodec.h:1158
int vol_control_parameters
does the stream contain the low_delay flag, used to work around buggy encoders.
Definition: mpeg4video.h:104
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:348
uint8_t * mbintra_table
used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
Definition: mpegvideo.h:205
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:474
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:47
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:207
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:42
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:301
#define av_log2
Definition: intmath.h:100
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:274
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:439
#define FF_IDCT_AUTO
Definition: avcodec.h:2972
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:271
#define FF_PROFILE_MPEG4_CORE
Definition: avcodec.h:3178
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
uint16_t inter_matrix[64]
Definition: mpegvideo.h:310
int64_t last_non_b_time
Definition: mpegvideo.h:396
static const AVProfile profiles[]
AVS_Value src
Definition: avisynth_c.h:482
BlockDSPContext bdsp
Definition: mpegvideo.h:233
int debug
debug
Definition: avcodec.h:2852
main external API structure.
Definition: avcodec.h:1512
int cplx_estimation_trash_i
Definition: mpeg4video.h:105
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define FASTDIV(a, b)
Definition: mathops.h:210
#define RSHIFT(a, b)
Definition: common.h:53
ScanTable intra_scantable
Definition: mpegvideo.h:98
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:107
static int get_xbits(GetBitContext *s, int n)
read mpeg1 dc style vlc (sign bit + mantissa with no MSB).
Definition: get_bits.h:232
#define OPEN_READER(name, gb)
Definition: get_bits.h:134
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:37
#define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE
Definition: avcodec.h:3189
void * buf
Definition: avisynth_c.h:553
MPEG4 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstre...
Definition: pixfmt.h:151
#define SLICE_END
end marker found
Definition: mpegvideo.h:505
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:409
int showed_packed_warning
flag for having shown the warning about invalid Divx B-frames
Definition: mpeg4video.h:101
int progressive_sequence
Definition: mpegvideo.h:459
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:305
BYTE int const BYTE int int int height
Definition: avisynth_c.h:676
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:330
static int mpeg4_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Describe the class of an AVClass context structure.
Definition: log.h:67
ScanTable intra_h_scantable
Definition: mpegvideo.h:99
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:298
static const AVProfile mpeg4_video_profiles[]
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:206
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2801
rational number numerator/denominator
Definition: rational.h:43
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode mpeg4 headers.
int context_initialized
Definition: mpegvideo.h:131
#define GET_CACHE(name, gb)
Definition: get_bits.h:211
#define MB_TYPE_16x16
Definition: avcodec.h:1144
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2814
RLTable ff_h263_rl_inter
Definition: h263data.c:161
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
#define s1
Definition: regdef.h:38
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:176
const int16_t ff_mpeg4_default_intra_matrix[64]
Definition: mpeg4data.h:337
#define ER_DC_ERROR
int allocate_progress
Whether to allocate progress for frame threading.
Definition: internal.h:115
int f_code
forward MV resolution
Definition: mpegvideo.h:245
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:338
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
#define FF_IDCT_XVID
Definition: avcodec.h:2985
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:77
#define MV_DIR_FORWARD
Definition: mpegvideo.h:270
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:219
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:245
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:858
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:112
static int64_t pts
Global timestamp for the audio frames.
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2813
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:133
uint16_t pb_field_time
like above, just for interlaced
Definition: mpegvideo.h:400
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:196
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1709
uint8_t level
Definition: svq3.c:150
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2853
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:284
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:138
#define FF_BUG_AMV
Definition: avcodec.h:2804
MpegEncContext.
Definition: mpegvideo.h:88
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:190
int8_t * qscale_table
Definition: mpegpicture.h:50
#define MAX_RUN
Definition: rl.h:34
struct AVCodecContext * avctx
Definition: mpegvideo.h:105
uint16_t pp_field_time
Definition: mpegvideo.h:399
static int mpeg4_is_resync(Mpeg4DecContext *ctx)
check if the next stuff is a resync marker or the end.
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:521
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:208
static VLC sprite_trajectory
Definition: mpeg4videodec.c:47
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
int t_frame
time distance of first I -> B, used for interlaced B-frames
Definition: mpeg4video.h:84
static const AVOption mpeg4_options[]
common internal api header.
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:137
if(ret< 0)
Definition: vf_mcdeint.c:280
#define TEX_VLC_BITS
Definition: dv.h:93
static VLC dc_chrom
Definition: mpeg4videodec.c:46
#define MB_TYPE_8x8
Definition: avcodec.h:1147
Bi-dir predicted.
Definition: avutil.h:268
AVProfile.
Definition: avcodec.h:3470
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2909
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:48
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
int den
denominator
Definition: rational.h:45
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideodata.c:93
#define MB_TYPE_16x8
Definition: avcodec.h:1145
static const AVClass mpeg4_class
#define IS_INTRA(x, y)
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:149
void * priv_data
Definition: avcodec.h:1554
float re
Definition: fft-test.c:73
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
#define IS_8X8(a)
Definition: mpegutils.h:85
int len
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1562
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:364
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:500
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
#define FF_DEBUG_BUGS
Definition: avcodec.h:2872
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:175
#define IS_ACPRED(a)
Definition: mpegutils.h:90
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2915
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:454
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
int chroma_qscale
chroma QP
Definition: mpegvideo.h:212
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:255
#define av_uninit(x)
Definition: attributes.h:141
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO
Definition: avcodec.h:3190
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:308
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:69
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:126
ScanTable inter_scantable
if inter == intra then intra should be used to reduce tha cache usage
Definition: mpegvideo.h:97
#define FRAME_SKIPPED
return value for header parsers if frame is not coded
Definition: mpegvideo.h:61
#define FF_PROFILE_MPEG4_ADVANCED_CODING
Definition: avcodec.h:3187
int num_sprite_warping_points
Definition: mpeg4video.h:73
#define stride
#define MV_TYPE_8X8
4 vectors (h263, mpeg4 4MV)
Definition: mpegvideo.h:275
int b_code
backward MV resolution for B Frames (mpeg4)
Definition: mpegvideo.h:246
#define FF_BUG_EDGE
Definition: avcodec.h:2812
#define FF_PROFILE_MPEG4_CORE_SCALABLE
Definition: avcodec.h:3186
AVPixelFormat
Pixel format.
Definition: pixfmt.h:65
const uint8_t ff_mb_type_b_tab[4][2]
Definition: mpeg4data.h:332
static int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block, int n, int coded, int intra, int rvlc)
Decode a block.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:857
for(j=16;j >0;--j)
#define MB_TYPE_L0
Definition: avcodec.h:1157
#define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION
Definition: avcodec.h:3182
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
Predicted.
Definition: avutil.h:267
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:39
#define GOP_STARTCODE
Definition: mpeg4video.h:58
#define VOS_STARTCODE
Definition: mpeg4video.h:56
uint16_t pb_time
time distance between the last b and p,s,i frame
Definition: mpegvideo.h:398
static int width
#define GMC_SPRITE
Definition: mpeg4video.h:51
static int16_t block[64]
Definition: dct-test.c:110