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mpeg4videodec.c
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1 /*
2  * MPEG-4 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define UNCHECKED_BITSTREAM_READER 1
24 
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "error_resilience.h"
28 #include "idctdsp.h"
29 #include "internal.h"
30 #include "mpegutils.h"
31 #include "mpegvideo.h"
32 #include "mpegvideodata.h"
33 #include "mpeg4video.h"
34 #include "h263.h"
35 #include "profiles.h"
36 #include "thread.h"
37 #include "xvididct.h"
38 
39 /* The defines below define the number of bits that are read at once for
40  * reading vlc values. Changing these may improve speed and data cache needs
41  * be aware though that decreasing them may need the number of stages that is
42  * passed to get_vlc* to be increased. */
43 #define SPRITE_TRAJ_VLC_BITS 6
44 #define DC_VLC_BITS 9
45 #define MB_TYPE_B_VLC_BITS 4
46 
50 
51 static const int mb_type_b_map[4] = {
56 };
57 
58 /**
59  * Predict the ac.
60  * @param n block index (0-3 are luma, 4-5 are chroma)
61  * @param dir the ac prediction direction
62  */
63 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
64 {
65  int i;
66  int16_t *ac_val, *ac_val1;
67  int8_t *const qscale_table = s->current_picture.qscale_table;
68 
69  /* find prediction */
70  ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
71  ac_val1 = ac_val;
72  if (s->ac_pred) {
73  if (dir == 0) {
74  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
75  /* left prediction */
76  ac_val -= 16;
77 
78  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
79  n == 1 || n == 3) {
80  /* same qscale */
81  for (i = 1; i < 8; i++)
82  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
83  } else {
84  /* different qscale, we must rescale */
85  for (i = 1; i < 8; i++)
86  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
87  }
88  } else {
89  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
90  /* top prediction */
91  ac_val -= 16 * s->block_wrap[n];
92 
93  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
94  n == 2 || n == 3) {
95  /* same qscale */
96  for (i = 1; i < 8; i++)
97  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
98  } else {
99  /* different qscale, we must rescale */
100  for (i = 1; i < 8; i++)
101  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
102  }
103  }
104  }
105  /* left copy */
106  for (i = 1; i < 8; i++)
107  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
108 
109  /* top copy */
110  for (i = 1; i < 8; i++)
111  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
112 }
113 
114 /**
115  * check if the next stuff is a resync marker or the end.
116  * @return 0 if not
117  */
119 {
120  MpegEncContext *s = &ctx->m;
121  int bits_count = get_bits_count(&s->gb);
122  int v = show_bits(&s->gb, 16);
123 
125  return 0;
126 
127  while (v <= 0xFF) {
128  if (s->pict_type == AV_PICTURE_TYPE_B ||
129  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
130  break;
131  skip_bits(&s->gb, 8 + s->pict_type);
132  bits_count += 8 + s->pict_type;
133  v = show_bits(&s->gb, 16);
134  }
135 
136  if (bits_count + 8 >= s->gb.size_in_bits) {
137  v >>= 8;
138  v |= 0x7F >> (7 - (bits_count & 7));
139 
140  if (v == 0x7F)
141  return s->mb_num;
142  } else {
143  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
144  int len, mb_num;
145  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
146  GetBitContext gb = s->gb;
147 
148  skip_bits(&s->gb, 1);
149  align_get_bits(&s->gb);
150 
151  for (len = 0; len < 32; len++)
152  if (get_bits1(&s->gb))
153  break;
154 
155  mb_num = get_bits(&s->gb, mb_num_bits);
156  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
157  mb_num= -1;
158 
159  s->gb = gb;
160 
162  return mb_num;
163  }
164  }
165  return 0;
166 }
167 
169 {
170  MpegEncContext *s = &ctx->m;
171  int a = 2 << s->sprite_warping_accuracy;
172  int rho = 3 - s->sprite_warping_accuracy;
173  int r = 16 / a;
174  int alpha = 1;
175  int beta = 0;
176  int w = s->width;
177  int h = s->height;
178  int min_ab, i, w2, h2, w3, h3;
179  int sprite_ref[4][2];
180  int virtual_ref[2][2];
181  int64_t sprite_offset[2][2];
182  int64_t sprite_delta[2][2];
183 
184  // only true for rectangle shapes
185  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
186  { 0, s->height }, { s->width, s->height } };
187  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
188 
189  if (w <= 0 || h <= 0)
190  return AVERROR_INVALIDDATA;
191 
192  /* the decoder was not properly initialized and we cannot continue */
193  if (sprite_trajectory.table == NULL)
194  return AVERROR_INVALIDDATA;
195 
196  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
197  int length;
198  int x = 0, y = 0;
199 
200  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
201  if (length > 0)
202  x = get_xbits(gb, length);
203 
204  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
205  check_marker(s->avctx, gb, "before sprite_trajectory");
206 
207  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
208  if (length > 0)
209  y = get_xbits(gb, length);
210 
211  check_marker(s->avctx, gb, "after sprite_trajectory");
212  ctx->sprite_traj[i][0] = d[i][0] = x;
213  ctx->sprite_traj[i][1] = d[i][1] = y;
214  }
215  for (; i < 4; i++)
216  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
217 
218  while ((1 << alpha) < w)
219  alpha++;
220  while ((1 << beta) < h)
221  beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
222  w2 = 1 << alpha;
223  h2 = 1 << beta;
224 
225  // Note, the 4th point isn't used for GMC
226  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
227  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
228  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
229  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
230  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
231  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
232  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
233  } else {
234  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
235  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
236  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
237  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
238  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
239  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
240  }
241  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
242  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
243 
244  /* This is mostly identical to the MPEG-4 std (and is totally unreadable
245  * because of that...). Perhaps it should be reordered to be more readable.
246  * The idea behind this virtual_ref mess is to be able to use shifts later
247  * per pixel instead of divides so the distance between points is converted
248  * from w&h based to w2&h2 based which are of the 2^x form. */
249  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
250  ROUNDED_DIV(((w - w2) *
251  (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
252  w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
253  virtual_ref[0][1] = 16 * vop_ref[0][1] +
254  ROUNDED_DIV(((w - w2) *
255  (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
256  w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
257  virtual_ref[1][0] = 16 * vop_ref[0][0] +
258  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
259  h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
260  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
261  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
262  h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
263 
264  switch (ctx->num_sprite_warping_points) {
265  case 0:
266  sprite_offset[0][0] =
267  sprite_offset[0][1] =
268  sprite_offset[1][0] =
269  sprite_offset[1][1] = 0;
270  sprite_delta[0][0] = a;
271  sprite_delta[0][1] =
272  sprite_delta[1][0] = 0;
273  sprite_delta[1][1] = a;
274  ctx->sprite_shift[0] =
275  ctx->sprite_shift[1] = 0;
276  break;
277  case 1: // GMC only
278  sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
279  sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
280  sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
281  a * (vop_ref[0][0] / 2);
282  sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
283  a * (vop_ref[0][1] / 2);
284  sprite_delta[0][0] = a;
285  sprite_delta[0][1] =
286  sprite_delta[1][0] = 0;
287  sprite_delta[1][1] = a;
288  ctx->sprite_shift[0] =
289  ctx->sprite_shift[1] = 0;
290  break;
291  case 2:
292  sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
293  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
294  ((int64_t) -vop_ref[0][0]) +
295  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
296  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
297  sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
298  ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
299  ((int64_t) -vop_ref[0][0]) +
300  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
301  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
302  sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
303  ((int64_t)-2 * vop_ref[0][0] + 1) +
304  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
305  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
306  (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
307  sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
308  ((int64_t)-2 * vop_ref[0][0] + 1) +
309  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
310  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
311  (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
312  sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
313  sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
314  sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
315  sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
316 
317  ctx->sprite_shift[0] = alpha + rho;
318  ctx->sprite_shift[1] = alpha + rho + 2;
319  break;
320  case 3:
321  min_ab = FFMIN(alpha, beta);
322  w3 = w2 >> min_ab;
323  h3 = h2 >> min_ab;
324  sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
325  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
326  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
327  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
328  sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
329  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
330  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
331  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
332  sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
333  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
334  (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
335  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
336  sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
337  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
338  (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
339  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
340  sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
341  sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
342  sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
343  sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
344 
345  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
346  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
347  break;
348  }
349  /* try to simplify the situation */
350  if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
351  sprite_delta[0][1] == 0 &&
352  sprite_delta[1][0] == 0 &&
353  sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
354  sprite_offset[0][0] >>= ctx->sprite_shift[0];
355  sprite_offset[0][1] >>= ctx->sprite_shift[0];
356  sprite_offset[1][0] >>= ctx->sprite_shift[1];
357  sprite_offset[1][1] >>= ctx->sprite_shift[1];
358  sprite_delta[0][0] = a;
359  sprite_delta[0][1] = 0;
360  sprite_delta[1][0] = 0;
361  sprite_delta[1][1] = a;
362  ctx->sprite_shift[0] = 0;
363  ctx->sprite_shift[1] = 0;
365  } else {
366  int shift_y = 16 - ctx->sprite_shift[0];
367  int shift_c = 16 - ctx->sprite_shift[1];
368 
369  for (i = 0; i < 2; i++) {
370  if (shift_c < 0 || shift_y < 0 ||
371  FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
372  FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
373  FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
374  FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
375  ) {
376  avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
377  goto overflow;
378  }
379  }
380 
381  for (i = 0; i < 2; i++) {
382  sprite_offset[0][i] *= 1 << shift_y;
383  sprite_offset[1][i] *= 1 << shift_c;
384  sprite_delta[0][i] *= 1 << shift_y;
385  sprite_delta[1][i] *= 1 << shift_y;
386  ctx->sprite_shift[i] = 16;
387 
388  }
389  for (i = 0; i < 2; i++) {
390  int64_t sd[2] = {
391  sprite_delta[i][0] - a * (1LL<<16),
392  sprite_delta[i][1] - a * (1LL<<16)
393  };
394 
395  if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
396  llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
397  llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
398  llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
399  llabs(sprite_delta[i][1] * (w+16LL)) >= INT_MAX ||
400  llabs(sd[0]) >= INT_MAX ||
401  llabs(sd[1]) >= INT_MAX ||
402  llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
403  llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
404  llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
405  ) {
406  avpriv_request_sample(s->avctx, "Overflow on sprite points");
407  goto overflow;
408  }
409  }
411  }
412 
413  for (i = 0; i < 4; i++) {
414  s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
415  s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
416  }
417 
418  return 0;
419 overflow:
420  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
421  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
422  return AVERROR_PATCHWELCOME;
423 }
424 
426  MpegEncContext *s = &ctx->m;
427  int len = FFMIN(ctx->time_increment_bits + 3, 15);
428 
429  get_bits(gb, len);
430  if (get_bits1(gb))
431  get_bits(gb, len);
432  check_marker(s->avctx, gb, "after new_pred");
433 
434  return 0;
435 }
436 
437 /**
438  * Decode the next video packet.
439  * @return <0 if something went wrong
440  */
442 {
443  MpegEncContext *s = &ctx->m;
444 
445  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
446  int header_extension = 0, mb_num, len;
447 
448  /* is there enough space left for a video packet + header */
449  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
450  return -1;
451 
452  for (len = 0; len < 32; len++)
453  if (get_bits1(&s->gb))
454  break;
455 
457  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
458  return -1;
459  }
460 
461  if (ctx->shape != RECT_SHAPE) {
462  header_extension = get_bits1(&s->gb);
463  // FIXME more stuff here
464  }
465 
466  mb_num = get_bits(&s->gb, mb_num_bits);
467  if (mb_num >= s->mb_num) {
469  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
470  return -1;
471  }
472 
473  s->mb_x = mb_num % s->mb_width;
474  s->mb_y = mb_num / s->mb_width;
475 
476  if (ctx->shape != BIN_ONLY_SHAPE) {
477  int qscale = get_bits(&s->gb, s->quant_precision);
478  if (qscale)
479  s->chroma_qscale = s->qscale = qscale;
480  }
481 
482  if (ctx->shape == RECT_SHAPE)
483  header_extension = get_bits1(&s->gb);
484 
485  if (header_extension) {
486  int time_incr = 0;
487 
488  while (get_bits1(&s->gb) != 0)
489  time_incr++;
490 
491  check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
492  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
493  check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
494 
495  skip_bits(&s->gb, 2); /* vop coding type */
496  // FIXME not rect stuff here
497 
498  if (ctx->shape != BIN_ONLY_SHAPE) {
499  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
500  // FIXME don't just ignore everything
501  if (s->pict_type == AV_PICTURE_TYPE_S &&
502  ctx->vol_sprite_usage == GMC_SPRITE) {
503  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
504  return AVERROR_INVALIDDATA;
505  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
506  }
507 
508  // FIXME reduced res stuff here
509 
510  if (s->pict_type != AV_PICTURE_TYPE_I) {
511  int f_code = get_bits(&s->gb, 3); /* fcode_for */
512  if (f_code == 0)
514  "Error, video packet header damaged (f_code=0)\n");
515  }
516  if (s->pict_type == AV_PICTURE_TYPE_B) {
517  int b_code = get_bits(&s->gb, 3);
518  if (b_code == 0)
520  "Error, video packet header damaged (b_code=0)\n");
521  }
522  }
523  }
524  if (ctx->new_pred)
525  decode_new_pred(ctx, &s->gb);
526 
527  return 0;
528 }
529 
530 /**
531  * Get the average motion vector for a GMC MB.
532  * @param n either 0 for the x component or 1 for y
533  * @return the average MV for a GMC MB
534  */
535 static inline int get_amv(Mpeg4DecContext *ctx, int n)
536 {
537  MpegEncContext *s = &ctx->m;
538  int x, y, mb_v, sum, dx, dy, shift;
539  int len = 1 << (s->f_code + 4);
540  const int a = s->sprite_warping_accuracy;
541 
542  if (s->workaround_bugs & FF_BUG_AMV)
543  len >>= s->quarter_sample;
544 
545  if (s->real_sprite_warping_points == 1) {
546  if (ctx->divx_version == 500 && ctx->divx_build == 413)
547  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
548  else
549  sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
550  } else {
551  dx = s->sprite_delta[n][0];
552  dy = s->sprite_delta[n][1];
553  shift = ctx->sprite_shift[0];
554  if (n)
555  dy -= 1 << (shift + a + 1);
556  else
557  dx -= 1 << (shift + a + 1);
558  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
559 
560  sum = 0;
561  for (y = 0; y < 16; y++) {
562  int v;
563 
564  v = mb_v + dy * y;
565  // FIXME optimize
566  for (x = 0; x < 16; x++) {
567  sum += v >> shift;
568  v += dx;
569  }
570  }
571  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
572  }
573 
574  if (sum < -len)
575  sum = -len;
576  else if (sum >= len)
577  sum = len - 1;
578 
579  return sum;
580 }
581 
582 /**
583  * Decode the dc value.
584  * @param n block index (0-3 are luma, 4-5 are chroma)
585  * @param dir_ptr the prediction direction will be stored here
586  * @return the quantized dc
587  */
588 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
589 {
590  int level, code;
591 
592  if (n < 4)
593  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
594  else
595  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
596 
597  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
598  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
599  return -1;
600  }
601 
602  if (code == 0) {
603  level = 0;
604  } else {
605  if (IS_3IV1) {
606  if (code == 1)
607  level = 2 * get_bits1(&s->gb) - 1;
608  else {
609  if (get_bits1(&s->gb))
610  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
611  else
612  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
613  }
614  } else {
615  level = get_xbits(&s->gb, code);
616  }
617 
618  if (code > 8) {
619  if (get_bits1(&s->gb) == 0) { /* marker */
621  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
622  return -1;
623  }
624  }
625  }
626  }
627 
628  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
629 }
630 
631 /**
632  * Decode first partition.
633  * @return number of MBs decoded or <0 if an error occurred
634  */
636 {
637  MpegEncContext *s = &ctx->m;
638  int mb_num = 0;
639  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
640 
641  /* decode first partition */
642  s->first_slice_line = 1;
643  for (; s->mb_y < s->mb_height; s->mb_y++) {
645  for (; s->mb_x < s->mb_width; s->mb_x++) {
646  const int xy = s->mb_x + s->mb_y * s->mb_stride;
647  int cbpc;
648  int dir = 0;
649 
650  mb_num++;
652  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
653  s->first_slice_line = 0;
654 
655  if (s->pict_type == AV_PICTURE_TYPE_I) {
656  int i;
657 
658  do {
659  if (show_bits_long(&s->gb, 19) == DC_MARKER)
660  return mb_num - 1;
661 
663  if (cbpc < 0) {
665  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
666  return -1;
667  }
668  } while (cbpc == 8);
669 
670  s->cbp_table[xy] = cbpc & 3;
672  s->mb_intra = 1;
673 
674  if (cbpc & 4)
675  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
676 
677  s->current_picture.qscale_table[xy] = s->qscale;
678 
679  s->mbintra_table[xy] = 1;
680  for (i = 0; i < 6; i++) {
681  int dc_pred_dir;
682  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
683  if (dc < 0) {
685  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
686  return -1;
687  }
688  dir <<= 1;
689  if (dc_pred_dir)
690  dir |= 1;
691  }
692  s->pred_dir_table[xy] = dir;
693  } else { /* P/S_TYPE */
694  int mx, my, pred_x, pred_y, bits;
695  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
696  const int stride = s->b8_stride * 2;
697 
698 try_again:
699  bits = show_bits(&s->gb, 17);
700  if (bits == MOTION_MARKER)
701  return mb_num - 1;
702 
703  skip_bits1(&s->gb);
704  if (bits & 0x10000) {
705  /* skip mb */
706  if (s->pict_type == AV_PICTURE_TYPE_S &&
707  ctx->vol_sprite_usage == GMC_SPRITE) {
709  MB_TYPE_16x16 |
710  MB_TYPE_GMC |
711  MB_TYPE_L0;
712  mx = get_amv(ctx, 0);
713  my = get_amv(ctx, 1);
714  } else {
716  MB_TYPE_16x16 |
717  MB_TYPE_L0;
718  mx = my = 0;
719  }
720  mot_val[0] =
721  mot_val[2] =
722  mot_val[0 + stride] =
723  mot_val[2 + stride] = mx;
724  mot_val[1] =
725  mot_val[3] =
726  mot_val[1 + stride] =
727  mot_val[3 + stride] = my;
728 
729  if (s->mbintra_table[xy])
731  continue;
732  }
733 
735  if (cbpc < 0) {
737  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
738  return -1;
739  }
740  if (cbpc == 20)
741  goto try_again;
742 
743  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
744 
745  s->mb_intra = ((cbpc & 4) != 0);
746 
747  if (s->mb_intra) {
749  s->mbintra_table[xy] = 1;
750  mot_val[0] =
751  mot_val[2] =
752  mot_val[0 + stride] =
753  mot_val[2 + stride] = 0;
754  mot_val[1] =
755  mot_val[3] =
756  mot_val[1 + stride] =
757  mot_val[3 + stride] = 0;
758  } else {
759  if (s->mbintra_table[xy])
761 
762  if (s->pict_type == AV_PICTURE_TYPE_S &&
763  ctx->vol_sprite_usage == GMC_SPRITE &&
764  (cbpc & 16) == 0)
765  s->mcsel = get_bits1(&s->gb);
766  else
767  s->mcsel = 0;
768 
769  if ((cbpc & 16) == 0) {
770  /* 16x16 motion prediction */
771 
772  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
773  if (!s->mcsel) {
774  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
775  if (mx >= 0xffff)
776  return -1;
777 
778  my = ff_h263_decode_motion(s, pred_y, s->f_code);
779  if (my >= 0xffff)
780  return -1;
782  MB_TYPE_L0;
783  } else {
784  mx = get_amv(ctx, 0);
785  my = get_amv(ctx, 1);
787  MB_TYPE_GMC |
788  MB_TYPE_L0;
789  }
790 
791  mot_val[0] =
792  mot_val[2] =
793  mot_val[0 + stride] =
794  mot_val[2 + stride] = mx;
795  mot_val[1] =
796  mot_val[3] =
797  mot_val[1 + stride] =
798  mot_val[3 + stride] = my;
799  } else {
800  int i;
802  MB_TYPE_L0;
803  for (i = 0; i < 4; i++) {
804  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
805  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
806  if (mx >= 0xffff)
807  return -1;
808 
809  my = ff_h263_decode_motion(s, pred_y, s->f_code);
810  if (my >= 0xffff)
811  return -1;
812  mot_val[0] = mx;
813  mot_val[1] = my;
814  }
815  }
816  }
817  }
818  }
819  s->mb_x = 0;
820  }
821 
822  return mb_num;
823 }
824 
825 /**
826  * decode second partition.
827  * @return <0 if an error occurred
828  */
829 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
830 {
831  int mb_num = 0;
832  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
833 
834  s->mb_x = s->resync_mb_x;
835  s->first_slice_line = 1;
836  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
838  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
839  const int xy = s->mb_x + s->mb_y * s->mb_stride;
840 
841  mb_num++;
843  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
844  s->first_slice_line = 0;
845 
846  if (s->pict_type == AV_PICTURE_TYPE_I) {
847  int ac_pred = get_bits1(&s->gb);
848  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
849  if (cbpy < 0) {
851  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
852  return -1;
853  }
854 
855  s->cbp_table[xy] |= cbpy << 2;
856  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
857  } else { /* P || S_TYPE */
858  if (IS_INTRA(s->current_picture.mb_type[xy])) {
859  int i;
860  int dir = 0;
861  int ac_pred = get_bits1(&s->gb);
862  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
863 
864  if (cbpy < 0) {
866  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
867  return -1;
868  }
869 
870  if (s->cbp_table[xy] & 8)
871  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
872  s->current_picture.qscale_table[xy] = s->qscale;
873 
874  for (i = 0; i < 6; i++) {
875  int dc_pred_dir;
876  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
877  if (dc < 0) {
879  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
880  return -1;
881  }
882  dir <<= 1;
883  if (dc_pred_dir)
884  dir |= 1;
885  }
886  s->cbp_table[xy] &= 3; // remove dquant
887  s->cbp_table[xy] |= cbpy << 2;
888  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
889  s->pred_dir_table[xy] = dir;
890  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
891  s->current_picture.qscale_table[xy] = s->qscale;
892  s->cbp_table[xy] = 0;
893  } else {
894  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
895 
896  if (cbpy < 0) {
898  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
899  return -1;
900  }
901 
902  if (s->cbp_table[xy] & 8)
903  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
904  s->current_picture.qscale_table[xy] = s->qscale;
905 
906  s->cbp_table[xy] &= 3; // remove dquant
907  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
908  }
909  }
910  }
911  if (mb_num >= mb_count)
912  return 0;
913  s->mb_x = 0;
914  }
915  return 0;
916 }
917 
918 /**
919  * Decode the first and second partition.
920  * @return <0 if error (and sets error type in the error_status_table)
921  */
923 {
924  MpegEncContext *s = &ctx->m;
925  int mb_num;
926  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
927  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
928 
929  mb_num = mpeg4_decode_partition_a(ctx);
930  if (mb_num <= 0) {
932  s->mb_x, s->mb_y, part_a_error);
933  return -1;
934  }
935 
936  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
937  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
939  s->mb_x, s->mb_y, part_a_error);
940  return -1;
941  }
942 
943  s->mb_num_left = mb_num;
944 
945  if (s->pict_type == AV_PICTURE_TYPE_I) {
946  while (show_bits(&s->gb, 9) == 1)
947  skip_bits(&s->gb, 9);
948  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
950  "marker missing after first I partition at %d %d\n",
951  s->mb_x, s->mb_y);
952  return -1;
953  }
954  } else {
955  while (show_bits(&s->gb, 10) == 1)
956  skip_bits(&s->gb, 10);
957  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
959  "marker missing after first P partition at %d %d\n",
960  s->mb_x, s->mb_y);
961  return -1;
962  }
963  }
965  s->mb_x - 1, s->mb_y, part_a_end);
966 
967  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
968  if (s->pict_type == AV_PICTURE_TYPE_P)
970  s->mb_x, s->mb_y, ER_DC_ERROR);
971  return -1;
972  } else {
973  if (s->pict_type == AV_PICTURE_TYPE_P)
975  s->mb_x - 1, s->mb_y, ER_DC_END);
976  }
977 
978  return 0;
979 }
980 
981 /**
982  * Decode a block.
983  * @return <0 if an error occurred
984  */
985 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
986  int n, int coded, int intra, int rvlc)
987 {
988  MpegEncContext *s = &ctx->m;
989  int level, i, last, run, qmul, qadd;
990  int av_uninit(dc_pred_dir);
991  RLTable *rl;
992  RL_VLC_ELEM *rl_vlc;
993  const uint8_t *scan_table;
994 
995  // Note intra & rvlc should be optimized away if this is inlined
996 
997  if (intra) {
998  if (ctx->use_intra_dc_vlc) {
999  /* DC coef */
1000  if (s->partitioned_frame) {
1001  level = s->dc_val[0][s->block_index[n]];
1002  if (n < 4)
1003  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1004  else
1005  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1006  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1007  } else {
1008  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1009  if (level < 0)
1010  return -1;
1011  }
1012  block[0] = level;
1013  i = 0;
1014  } else {
1015  i = -1;
1016  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1017  }
1018  if (!coded)
1019  goto not_coded;
1020 
1021  if (rvlc) {
1022  rl = &ff_rvlc_rl_intra;
1023  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1024  } else {
1025  rl = &ff_mpeg4_rl_intra;
1026  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1027  }
1028  if (s->ac_pred) {
1029  if (dc_pred_dir == 0)
1030  scan_table = s->intra_v_scantable.permutated; /* left */
1031  else
1032  scan_table = s->intra_h_scantable.permutated; /* top */
1033  } else {
1034  scan_table = s->intra_scantable.permutated;
1035  }
1036  qmul = 1;
1037  qadd = 0;
1038  } else {
1039  i = -1;
1040  if (!coded) {
1041  s->block_last_index[n] = i;
1042  return 0;
1043  }
1044  if (rvlc)
1045  rl = &ff_rvlc_rl_inter;
1046  else
1047  rl = &ff_h263_rl_inter;
1048 
1049  scan_table = s->intra_scantable.permutated;
1050 
1051  if (s->mpeg_quant) {
1052  qmul = 1;
1053  qadd = 0;
1054  if (rvlc)
1055  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1056  else
1057  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1058  } else {
1059  qmul = s->qscale << 1;
1060  qadd = (s->qscale - 1) | 1;
1061  if (rvlc)
1062  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1063  else
1064  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1065  }
1066  }
1067  {
1068  OPEN_READER(re, &s->gb);
1069  for (;;) {
1070  UPDATE_CACHE(re, &s->gb);
1071  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1072  if (level == 0) {
1073  /* escape */
1074  if (rvlc) {
1075  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1077  "1. marker bit missing in rvlc esc\n");
1078  return -1;
1079  }
1080  SKIP_CACHE(re, &s->gb, 1);
1081 
1082  last = SHOW_UBITS(re, &s->gb, 1);
1083  SKIP_CACHE(re, &s->gb, 1);
1084  run = SHOW_UBITS(re, &s->gb, 6);
1085  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1086  UPDATE_CACHE(re, &s->gb);
1087 
1088  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1090  "2. marker bit missing in rvlc esc\n");
1091  return -1;
1092  }
1093  SKIP_CACHE(re, &s->gb, 1);
1094 
1095  level = SHOW_UBITS(re, &s->gb, 11);
1096  SKIP_CACHE(re, &s->gb, 11);
1097 
1098  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1099  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1100  return -1;
1101  }
1102  SKIP_CACHE(re, &s->gb, 5);
1103 
1104  level = level * qmul + qadd;
1105  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1106  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1107 
1108  i += run + 1;
1109  if (last)
1110  i += 192;
1111  } else {
1112  int cache;
1113  cache = GET_CACHE(re, &s->gb);
1114 
1115  if (IS_3IV1)
1116  cache ^= 0xC0000000;
1117 
1118  if (cache & 0x80000000) {
1119  if (cache & 0x40000000) {
1120  /* third escape */
1121  SKIP_CACHE(re, &s->gb, 2);
1122  last = SHOW_UBITS(re, &s->gb, 1);
1123  SKIP_CACHE(re, &s->gb, 1);
1124  run = SHOW_UBITS(re, &s->gb, 6);
1125  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1126  UPDATE_CACHE(re, &s->gb);
1127 
1128  if (IS_3IV1) {
1129  level = SHOW_SBITS(re, &s->gb, 12);
1130  LAST_SKIP_BITS(re, &s->gb, 12);
1131  } else {
1132  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1134  "1. marker bit missing in 3. esc\n");
1135  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1136  return -1;
1137  }
1138  SKIP_CACHE(re, &s->gb, 1);
1139 
1140  level = SHOW_SBITS(re, &s->gb, 12);
1141  SKIP_CACHE(re, &s->gb, 12);
1142 
1143  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1145  "2. marker bit missing in 3. esc\n");
1146  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1147  return -1;
1148  }
1149 
1150  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1151  }
1152 
1153 #if 0
1154  if (s->error_recognition >= FF_ER_COMPLIANT) {
1155  const int abs_level= FFABS(level);
1156  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1157  const int run1= run - rl->max_run[last][abs_level] - 1;
1158  if (abs_level <= rl->max_level[last][run]) {
1159  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1160  return -1;
1161  }
1162  if (s->error_recognition > FF_ER_COMPLIANT) {
1163  if (abs_level <= rl->max_level[last][run]*2) {
1164  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1165  return -1;
1166  }
1167  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1168  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1169  return -1;
1170  }
1171  }
1172  }
1173  }
1174 #endif
1175  if (level > 0)
1176  level = level * qmul + qadd;
1177  else
1178  level = level * qmul - qadd;
1179 
1180  if ((unsigned)(level + 2048) > 4095) {
1182  if (level > 2560 || level < -2560) {
1184  "|level| overflow in 3. esc, qp=%d\n",
1185  s->qscale);
1186  return -1;
1187  }
1188  }
1189  level = level < 0 ? -2048 : 2047;
1190  }
1191 
1192  i += run + 1;
1193  if (last)
1194  i += 192;
1195  } else {
1196  /* second escape */
1197  SKIP_BITS(re, &s->gb, 2);
1198  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1199  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1200  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1201  LAST_SKIP_BITS(re, &s->gb, 1);
1202  }
1203  } else {
1204  /* first escape */
1205  SKIP_BITS(re, &s->gb, 1);
1206  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1207  i += run;
1208  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
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  }
1213  } else {
1214  i += run;
1215  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1216  LAST_SKIP_BITS(re, &s->gb, 1);
1217  }
1218  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1219  if (i > 62) {
1220  i -= 192;
1221  if (i & (~63)) {
1223  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1224  return -1;
1225  }
1226 
1227  block[scan_table[i]] = level;
1228  break;
1229  }
1230 
1231  block[scan_table[i]] = level;
1232  }
1233  CLOSE_READER(re, &s->gb);
1234  }
1235 
1236 not_coded:
1237  if (intra) {
1238  if (!ctx->use_intra_dc_vlc) {
1239  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1240 
1241  i -= i >> 31; // if (i == -1) i = 0;
1242  }
1243 
1244  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1245  if (s->ac_pred)
1246  i = 63; // FIXME not optimal
1247  }
1248  s->block_last_index[n] = i;
1249  return 0;
1250 }
1251 
1252 /**
1253  * decode partition C of one MB.
1254  * @return <0 if an error occurred
1255  */
1257 {
1259  int cbp, mb_type;
1260  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1261 
1262  mb_type = s->current_picture.mb_type[xy];
1263  cbp = s->cbp_table[xy];
1264 
1265  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1266 
1267  if (s->current_picture.qscale_table[xy] != s->qscale)
1269 
1270  if (s->pict_type == AV_PICTURE_TYPE_P ||
1271  s->pict_type == AV_PICTURE_TYPE_S) {
1272  int i;
1273  for (i = 0; i < 4; i++) {
1274  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1275  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1276  }
1277  s->mb_intra = IS_INTRA(mb_type);
1278 
1279  if (IS_SKIP(mb_type)) {
1280  /* skip mb */
1281  for (i = 0; i < 6; i++)
1282  s->block_last_index[i] = -1;
1283  s->mv_dir = MV_DIR_FORWARD;
1284  s->mv_type = MV_TYPE_16X16;
1286  && ctx->vol_sprite_usage == GMC_SPRITE) {
1287  s->mcsel = 1;
1288  s->mb_skipped = 0;
1289  } else {
1290  s->mcsel = 0;
1291  s->mb_skipped = 1;
1292  }
1293  } else if (s->mb_intra) {
1295  } else if (!s->mb_intra) {
1296  // s->mcsel = 0; // FIXME do we need to init that?
1297 
1298  s->mv_dir = MV_DIR_FORWARD;
1299  if (IS_8X8(mb_type)) {
1300  s->mv_type = MV_TYPE_8X8;
1301  } else {
1302  s->mv_type = MV_TYPE_16X16;
1303  }
1304  }
1305  } else { /* I-Frame */
1306  s->mb_intra = 1;
1308  }
1309 
1310  if (!IS_SKIP(mb_type)) {
1311  int i;
1312  s->bdsp.clear_blocks(s->block[0]);
1313  /* decode each block */
1314  for (i = 0; i < 6; i++) {
1315  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1317  "texture corrupted at %d %d %d\n",
1318  s->mb_x, s->mb_y, s->mb_intra);
1319  return -1;
1320  }
1321  cbp += cbp;
1322  }
1323  }
1324 
1325  /* per-MB end of slice check */
1326  if (--s->mb_num_left <= 0) {
1327  if (mpeg4_is_resync(ctx))
1328  return SLICE_END;
1329  else
1330  return SLICE_NOEND;
1331  } else {
1332  if (mpeg4_is_resync(ctx)) {
1333  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1334  if (s->cbp_table[xy + delta])
1335  return SLICE_END;
1336  }
1337  return SLICE_OK;
1338  }
1339 }
1340 
1341 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1342 {
1344  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1345  int16_t *mot_val;
1346  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1347  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1348 
1349  av_assert2(s->h263_pred);
1350 
1351  if (s->pict_type == AV_PICTURE_TYPE_P ||
1352  s->pict_type == AV_PICTURE_TYPE_S) {
1353  do {
1354  if (get_bits1(&s->gb)) {
1355  /* skip mb */
1356  s->mb_intra = 0;
1357  for (i = 0; i < 6; i++)
1358  s->block_last_index[i] = -1;
1359  s->mv_dir = MV_DIR_FORWARD;
1360  s->mv_type = MV_TYPE_16X16;
1361  if (s->pict_type == AV_PICTURE_TYPE_S &&
1362  ctx->vol_sprite_usage == GMC_SPRITE) {
1364  MB_TYPE_GMC |
1365  MB_TYPE_16x16 |
1366  MB_TYPE_L0;
1367  s->mcsel = 1;
1368  s->mv[0][0][0] = get_amv(ctx, 0);
1369  s->mv[0][0][1] = get_amv(ctx, 1);
1370  s->mb_skipped = 0;
1371  } else {
1373  MB_TYPE_16x16 |
1374  MB_TYPE_L0;
1375  s->mcsel = 0;
1376  s->mv[0][0][0] = 0;
1377  s->mv[0][0][1] = 0;
1378  s->mb_skipped = 1;
1379  }
1380  goto end;
1381  }
1383  if (cbpc < 0) {
1385  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1386  return -1;
1387  }
1388  } while (cbpc == 20);
1389 
1390  s->bdsp.clear_blocks(s->block[0]);
1391  dquant = cbpc & 8;
1392  s->mb_intra = ((cbpc & 4) != 0);
1393  if (s->mb_intra)
1394  goto intra;
1395 
1396  if (s->pict_type == AV_PICTURE_TYPE_S &&
1397  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1398  s->mcsel = get_bits1(&s->gb);
1399  else
1400  s->mcsel = 0;
1401  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1402  if (cbpy < 0) {
1404  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1405  return AVERROR_INVALIDDATA;
1406  }
1407 
1408  cbp = (cbpc & 3) | (cbpy << 2);
1409  if (dquant)
1410  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1411  if ((!s->progressive_sequence) &&
1412  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1413  s->interlaced_dct = get_bits1(&s->gb);
1414 
1415  s->mv_dir = MV_DIR_FORWARD;
1416  if ((cbpc & 16) == 0) {
1417  if (s->mcsel) {
1419  MB_TYPE_16x16 |
1420  MB_TYPE_L0;
1421  /* 16x16 global motion prediction */
1422  s->mv_type = MV_TYPE_16X16;
1423  mx = get_amv(ctx, 0);
1424  my = get_amv(ctx, 1);
1425  s->mv[0][0][0] = mx;
1426  s->mv[0][0][1] = my;
1427  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1429  MB_TYPE_L0 |
1431  /* 16x8 field motion prediction */
1432  s->mv_type = MV_TYPE_FIELD;
1433 
1434  s->field_select[0][0] = get_bits1(&s->gb);
1435  s->field_select[0][1] = get_bits1(&s->gb);
1436 
1437  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1438 
1439  for (i = 0; i < 2; i++) {
1440  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1441  if (mx >= 0xffff)
1442  return -1;
1443 
1444  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1445  if (my >= 0xffff)
1446  return -1;
1447 
1448  s->mv[0][i][0] = mx;
1449  s->mv[0][i][1] = my;
1450  }
1451  } else {
1453  /* 16x16 motion prediction */
1454  s->mv_type = MV_TYPE_16X16;
1455  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1456  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1457 
1458  if (mx >= 0xffff)
1459  return -1;
1460 
1461  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1462 
1463  if (my >= 0xffff)
1464  return -1;
1465  s->mv[0][0][0] = mx;
1466  s->mv[0][0][1] = my;
1467  }
1468  } else {
1470  s->mv_type = MV_TYPE_8X8;
1471  for (i = 0; i < 4; i++) {
1472  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1473  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1474  if (mx >= 0xffff)
1475  return -1;
1476 
1477  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1478  if (my >= 0xffff)
1479  return -1;
1480  s->mv[0][i][0] = mx;
1481  s->mv[0][i][1] = my;
1482  mot_val[0] = mx;
1483  mot_val[1] = my;
1484  }
1485  }
1486  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1487  int modb1; // first bit of modb
1488  int modb2; // second bit of modb
1489  int mb_type;
1490 
1491  s->mb_intra = 0; // B-frames never contain intra blocks
1492  s->mcsel = 0; // ... true gmc blocks
1493 
1494  if (s->mb_x == 0) {
1495  for (i = 0; i < 2; i++) {
1496  s->last_mv[i][0][0] =
1497  s->last_mv[i][0][1] =
1498  s->last_mv[i][1][0] =
1499  s->last_mv[i][1][1] = 0;
1500  }
1501 
1503  }
1504 
1505  /* if we skipped it in the future P-frame than skip it now too */
1506  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1507 
1508  if (s->mb_skipped) {
1509  /* skip mb */
1510  for (i = 0; i < 6; i++)
1511  s->block_last_index[i] = -1;
1512 
1513  s->mv_dir = MV_DIR_FORWARD;
1514  s->mv_type = MV_TYPE_16X16;
1515  s->mv[0][0][0] =
1516  s->mv[0][0][1] =
1517  s->mv[1][0][0] =
1518  s->mv[1][0][1] = 0;
1520  MB_TYPE_16x16 |
1521  MB_TYPE_L0;
1522  goto end;
1523  }
1524 
1525  modb1 = get_bits1(&s->gb);
1526  if (modb1) {
1527  // like MB_TYPE_B_DIRECT but no vectors coded
1529  cbp = 0;
1530  } else {
1531  modb2 = get_bits1(&s->gb);
1532  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1533  if (mb_type < 0) {
1534  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1535  return -1;
1536  }
1537  mb_type = mb_type_b_map[mb_type];
1538  if (modb2) {
1539  cbp = 0;
1540  } else {
1541  s->bdsp.clear_blocks(s->block[0]);
1542  cbp = get_bits(&s->gb, 6);
1543  }
1544 
1545  if ((!IS_DIRECT(mb_type)) && cbp) {
1546  if (get_bits1(&s->gb))
1547  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1548  }
1549 
1550  if (!s->progressive_sequence) {
1551  if (cbp)
1552  s->interlaced_dct = get_bits1(&s->gb);
1553 
1554  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1555  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1556  mb_type &= ~MB_TYPE_16x16;
1557 
1558  if (USES_LIST(mb_type, 0)) {
1559  s->field_select[0][0] = get_bits1(&s->gb);
1560  s->field_select[0][1] = get_bits1(&s->gb);
1561  }
1562  if (USES_LIST(mb_type, 1)) {
1563  s->field_select[1][0] = get_bits1(&s->gb);
1564  s->field_select[1][1] = get_bits1(&s->gb);
1565  }
1566  }
1567  }
1568 
1569  s->mv_dir = 0;
1570  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1571  s->mv_type = MV_TYPE_16X16;
1572 
1573  if (USES_LIST(mb_type, 0)) {
1574  s->mv_dir = MV_DIR_FORWARD;
1575 
1576  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1577  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1578  s->last_mv[0][1][0] =
1579  s->last_mv[0][0][0] =
1580  s->mv[0][0][0] = mx;
1581  s->last_mv[0][1][1] =
1582  s->last_mv[0][0][1] =
1583  s->mv[0][0][1] = my;
1584  }
1585 
1586  if (USES_LIST(mb_type, 1)) {
1587  s->mv_dir |= MV_DIR_BACKWARD;
1588 
1589  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1590  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1591  s->last_mv[1][1][0] =
1592  s->last_mv[1][0][0] =
1593  s->mv[1][0][0] = mx;
1594  s->last_mv[1][1][1] =
1595  s->last_mv[1][0][1] =
1596  s->mv[1][0][1] = my;
1597  }
1598  } else if (!IS_DIRECT(mb_type)) {
1599  s->mv_type = MV_TYPE_FIELD;
1600 
1601  if (USES_LIST(mb_type, 0)) {
1602  s->mv_dir = MV_DIR_FORWARD;
1603 
1604  for (i = 0; i < 2; i++) {
1605  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1606  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1607  s->last_mv[0][i][0] =
1608  s->mv[0][i][0] = mx;
1609  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1610  }
1611  }
1612 
1613  if (USES_LIST(mb_type, 1)) {
1614  s->mv_dir |= MV_DIR_BACKWARD;
1615 
1616  for (i = 0; i < 2; i++) {
1617  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1618  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1619  s->last_mv[1][i][0] =
1620  s->mv[1][i][0] = mx;
1621  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1622  }
1623  }
1624  }
1625  }
1626 
1627  if (IS_DIRECT(mb_type)) {
1628  if (IS_SKIP(mb_type)) {
1629  mx =
1630  my = 0;
1631  } else {
1632  mx = ff_h263_decode_motion(s, 0, 1);
1633  my = ff_h263_decode_motion(s, 0, 1);
1634  }
1635 
1637  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1638  }
1639  s->current_picture.mb_type[xy] = mb_type;
1640  } else { /* I-Frame */
1641  do {
1643  if (cbpc < 0) {
1645  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1646  return -1;
1647  }
1648  } while (cbpc == 8);
1649 
1650  dquant = cbpc & 4;
1651  s->mb_intra = 1;
1652 
1653 intra:
1654  s->ac_pred = get_bits1(&s->gb);
1655  if (s->ac_pred)
1657  else
1659 
1660  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1661  if (cbpy < 0) {
1663  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1664  return -1;
1665  }
1666  cbp = (cbpc & 3) | (cbpy << 2);
1667 
1668  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1669 
1670  if (dquant)
1671  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1672 
1673  if (!s->progressive_sequence)
1674  s->interlaced_dct = get_bits1(&s->gb);
1675 
1676  s->bdsp.clear_blocks(s->block[0]);
1677  /* decode each block */
1678  for (i = 0; i < 6; i++) {
1679  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1680  return -1;
1681  cbp += cbp;
1682  }
1683  goto end;
1684  }
1685 
1686  /* decode each block */
1687  for (i = 0; i < 6; i++) {
1688  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1689  return -1;
1690  cbp += cbp;
1691  }
1692 
1693 end:
1694  /* per-MB end of slice check */
1695  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1696  int next = mpeg4_is_resync(ctx);
1697  if (next) {
1698  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1699  return -1;
1700  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1701  return SLICE_END;
1702 
1703  if (s->pict_type == AV_PICTURE_TYPE_B) {
1704  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1706  (s->mb_x + delta >= s->mb_width)
1707  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1708  : s->mb_y, 0);
1709  if (s->next_picture.mbskip_table[xy + delta])
1710  return SLICE_OK;
1711  }
1712 
1713  return SLICE_END;
1714  }
1715  }
1716 
1717  return SLICE_OK;
1718 }
1719 
1721 {
1722  int hours, minutes, seconds;
1723 
1724  if (!show_bits(gb, 23)) {
1725  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1726  return -1;
1727  }
1728 
1729  hours = get_bits(gb, 5);
1730  minutes = get_bits(gb, 6);
1731  check_marker(s->avctx, gb, "in gop_header");
1732  seconds = get_bits(gb, 6);
1733 
1734  s->time_base = seconds + 60*(minutes + 60*hours);
1735 
1736  skip_bits1(gb);
1737  skip_bits1(gb);
1738 
1739  return 0;
1740 }
1741 
1743 {
1744 
1745  s->avctx->profile = get_bits(gb, 4);
1746  s->avctx->level = get_bits(gb, 4);
1747 
1748  // for Simple profile, level 0
1749  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1750  s->avctx->level = 0;
1751  }
1752 
1753  return 0;
1754 }
1755 
1757 {
1758  MpegEncContext *s = &ctx->m;
1759  int width, height, vo_ver_id;
1760 
1761  /* vol header */
1762  skip_bits(gb, 1); /* random access */
1763  s->vo_type = get_bits(gb, 8);
1764  if (get_bits1(gb) != 0) { /* is_ol_id */
1765  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1766  skip_bits(gb, 3); /* vo_priority */
1767  } else {
1768  vo_ver_id = 1;
1769  }
1770  s->aspect_ratio_info = get_bits(gb, 4);
1772  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1773  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1774  } else {
1776  }
1777 
1778  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1779  int chroma_format = get_bits(gb, 2);
1780  if (chroma_format != CHROMA_420)
1781  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1782 
1783  s->low_delay = get_bits1(gb);
1784  if (get_bits1(gb)) { /* vbv parameters */
1785  get_bits(gb, 15); /* first_half_bitrate */
1786  check_marker(s->avctx, gb, "after first_half_bitrate");
1787  get_bits(gb, 15); /* latter_half_bitrate */
1788  check_marker(s->avctx, gb, "after latter_half_bitrate");
1789  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1790  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1791  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1792  get_bits(gb, 11); /* first_half_vbv_occupancy */
1793  check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1794  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1795  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1796  }
1797  } else {
1798  /* is setting low delay flag only once the smartest thing to do?
1799  * low delay detection will not be overridden. */
1800  if (s->picture_number == 0) {
1801  switch(s->vo_type) {
1802  case SIMPLE_VO_TYPE:
1803  case ADV_SIMPLE_VO_TYPE:
1804  s->low_delay = 1;
1805  break;
1806  default:
1807  s->low_delay = 0;
1808  }
1809  }
1810  }
1811 
1812  ctx->shape = get_bits(gb, 2); /* vol shape */
1813  if (ctx->shape != RECT_SHAPE)
1814  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1815  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1816  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1817  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1818  }
1819 
1820  check_marker(s->avctx, gb, "before time_increment_resolution");
1821 
1822  s->avctx->framerate.num = get_bits(gb, 16);
1823  if (!s->avctx->framerate.num) {
1824  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1825  return AVERROR_INVALIDDATA;
1826  }
1827 
1828  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1829  if (ctx->time_increment_bits < 1)
1830  ctx->time_increment_bits = 1;
1831 
1832  check_marker(s->avctx, gb, "before fixed_vop_rate");
1833 
1834  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1836  else
1837  s->avctx->framerate.den = 1;
1838 
1840 
1841  ctx->t_frame = 0;
1842 
1843  if (ctx->shape != BIN_ONLY_SHAPE) {
1844  if (ctx->shape == RECT_SHAPE) {
1845  check_marker(s->avctx, gb, "before width");
1846  width = get_bits(gb, 13);
1847  check_marker(s->avctx, gb, "before height");
1848  height = get_bits(gb, 13);
1849  check_marker(s->avctx, gb, "after height");
1850  if (width && height && /* they should be non zero but who knows */
1851  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1852  if (s->width && s->height &&
1853  (s->width != width || s->height != height))
1854  s->context_reinit = 1;
1855  s->width = width;
1856  s->height = height;
1857  }
1858  }
1859 
1860  s->progressive_sequence =
1861  s->progressive_frame = get_bits1(gb) ^ 1;
1862  s->interlaced_dct = 0;
1863  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1864  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1865  "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1866  if (vo_ver_id == 1)
1867  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1868  else
1869  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1870 
1871  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1872  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1873  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1874  ctx->vol_sprite_usage == GMC_SPRITE) {
1875  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1876  skip_bits(gb, 13); // sprite_width
1877  check_marker(s->avctx, gb, "after sprite_width");
1878  skip_bits(gb, 13); // sprite_height
1879  check_marker(s->avctx, gb, "after sprite_height");
1880  skip_bits(gb, 13); // sprite_left
1881  check_marker(s->avctx, gb, "after sprite_left");
1882  skip_bits(gb, 13); // sprite_top
1883  check_marker(s->avctx, gb, "after sprite_top");
1884  }
1885  ctx->num_sprite_warping_points = get_bits(gb, 6);
1886  if (ctx->num_sprite_warping_points > 3) {
1887  av_log(s->avctx, AV_LOG_ERROR,
1888  "%d sprite_warping_points\n",
1889  ctx->num_sprite_warping_points);
1890  ctx->num_sprite_warping_points = 0;
1891  return AVERROR_INVALIDDATA;
1892  }
1893  s->sprite_warping_accuracy = get_bits(gb, 2);
1894  ctx->sprite_brightness_change = get_bits1(gb);
1895  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1896  skip_bits1(gb); // low_latency_sprite
1897  }
1898  // FIXME sadct disable bit if verid!=1 && shape not rect
1899 
1900  if (get_bits1(gb) == 1) { /* not_8_bit */
1901  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1902  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1903  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1904  if (s->quant_precision != 5)
1905  av_log(s->avctx, AV_LOG_ERROR,
1906  "quant precision %d\n", s->quant_precision);
1907  if (s->quant_precision<3 || s->quant_precision>9) {
1908  s->quant_precision = 5;
1909  }
1910  } else {
1911  s->quant_precision = 5;
1912  }
1913 
1914  // FIXME a bunch of grayscale shape things
1915 
1916  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1917  int i, v;
1918 
1919  /* load default matrixes */
1920  for (i = 0; i < 64; i++) {
1921  int j = s->idsp.idct_permutation[i];
1923  s->intra_matrix[j] = v;
1924  s->chroma_intra_matrix[j] = v;
1925 
1927  s->inter_matrix[j] = v;
1928  s->chroma_inter_matrix[j] = v;
1929  }
1930 
1931  /* load custom intra matrix */
1932  if (get_bits1(gb)) {
1933  int last = 0;
1934  for (i = 0; i < 64; i++) {
1935  int j;
1936  if (get_bits_left(gb) < 8) {
1937  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1938  return AVERROR_INVALIDDATA;
1939  }
1940  v = get_bits(gb, 8);
1941  if (v == 0)
1942  break;
1943 
1944  last = v;
1945  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1946  s->intra_matrix[j] = last;
1947  s->chroma_intra_matrix[j] = last;
1948  }
1949 
1950  /* replicate last value */
1951  for (; i < 64; i++) {
1952  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1953  s->intra_matrix[j] = last;
1954  s->chroma_intra_matrix[j] = last;
1955  }
1956  }
1957 
1958  /* load custom non intra matrix */
1959  if (get_bits1(gb)) {
1960  int last = 0;
1961  for (i = 0; i < 64; i++) {
1962  int j;
1963  if (get_bits_left(gb) < 8) {
1964  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1965  return AVERROR_INVALIDDATA;
1966  }
1967  v = get_bits(gb, 8);
1968  if (v == 0)
1969  break;
1970 
1971  last = v;
1972  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1973  s->inter_matrix[j] = v;
1974  s->chroma_inter_matrix[j] = v;
1975  }
1976 
1977  /* replicate last value */
1978  for (; i < 64; i++) {
1979  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1980  s->inter_matrix[j] = last;
1981  s->chroma_inter_matrix[j] = last;
1982  }
1983  }
1984 
1985  // FIXME a bunch of grayscale shape things
1986  }
1987 
1988  if (vo_ver_id != 1)
1989  s->quarter_sample = get_bits1(gb);
1990  else
1991  s->quarter_sample = 0;
1992 
1993  if (get_bits_left(gb) < 4) {
1994  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1995  return AVERROR_INVALIDDATA;
1996  }
1997 
1998  if (!get_bits1(gb)) {
1999  int pos = get_bits_count(gb);
2000  int estimation_method = get_bits(gb, 2);
2001  if (estimation_method < 2) {
2002  if (!get_bits1(gb)) {
2003  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2004  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2005  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2006  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2007  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2008  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2009  }
2010  if (!get_bits1(gb)) {
2011  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2012  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2013  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2014  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2015  }
2016  if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2017  skip_bits_long(gb, pos - get_bits_count(gb));
2018  goto no_cplx_est;
2019  }
2020  if (!get_bits1(gb)) {
2021  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2022  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2023  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2024  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2025  }
2026  if (!get_bits1(gb)) {
2027  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2028  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2029  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2030  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2031  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2032  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2033  }
2034  if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2035  skip_bits_long(gb, pos - get_bits_count(gb));
2036  goto no_cplx_est;
2037  }
2038  if (estimation_method == 1) {
2039  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2040  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2041  }
2042  } else
2043  av_log(s->avctx, AV_LOG_ERROR,
2044  "Invalid Complexity estimation method %d\n",
2045  estimation_method);
2046  } else {
2047 
2048 no_cplx_est:
2049  ctx->cplx_estimation_trash_i =
2050  ctx->cplx_estimation_trash_p =
2051  ctx->cplx_estimation_trash_b = 0;
2052  }
2053 
2054  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2055 
2056  s->data_partitioning = get_bits1(gb);
2057  if (s->data_partitioning)
2058  ctx->rvlc = get_bits1(gb);
2059 
2060  if (vo_ver_id != 1) {
2061  ctx->new_pred = get_bits1(gb);
2062  if (ctx->new_pred) {
2063  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2064  skip_bits(gb, 2); /* requested upstream message type */
2065  skip_bits1(gb); /* newpred segment type */
2066  }
2067  if (get_bits1(gb)) // reduced_res_vop
2068  av_log(s->avctx, AV_LOG_ERROR,
2069  "reduced resolution VOP not supported\n");
2070  } else {
2071  ctx->new_pred = 0;
2072  }
2073 
2074  ctx->scalability = get_bits1(gb);
2075 
2076  if (ctx->scalability) {
2077  GetBitContext bak = *gb;
2078  int h_sampling_factor_n;
2079  int h_sampling_factor_m;
2080  int v_sampling_factor_n;
2081  int v_sampling_factor_m;
2082 
2083  skip_bits1(gb); // hierarchy_type
2084  skip_bits(gb, 4); /* ref_layer_id */
2085  skip_bits1(gb); /* ref_layer_sampling_dir */
2086  h_sampling_factor_n = get_bits(gb, 5);
2087  h_sampling_factor_m = get_bits(gb, 5);
2088  v_sampling_factor_n = get_bits(gb, 5);
2089  v_sampling_factor_m = get_bits(gb, 5);
2090  ctx->enhancement_type = get_bits1(gb);
2091 
2092  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2093  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2094  /* illegal scalability header (VERY broken encoder),
2095  * trying to workaround */
2096  ctx->scalability = 0;
2097  *gb = bak;
2098  } else
2099  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2100 
2101  // bin shape stuff FIXME
2102  }
2103  }
2104 
2105  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2106  av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d %s%s%s%s\n",
2107  s->avctx->framerate.den, s->avctx->framerate.num,
2108  ctx->time_increment_bits,
2109  s->quant_precision,
2110  s->progressive_sequence,
2111  s->low_delay,
2112  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2113  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2114  );
2115  }
2116 
2117  return 0;
2118 }
2119 
2120 /**
2121  * Decode the user data stuff in the header.
2122  * Also initializes divx/xvid/lavc_version/build.
2123  */
2125 {
2126  MpegEncContext *s = &ctx->m;
2127  char buf[256];
2128  int i;
2129  int e;
2130  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2131  char last;
2132 
2133  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2134  if (show_bits(gb, 23) == 0)
2135  break;
2136  buf[i] = get_bits(gb, 8);
2137  }
2138  buf[i] = 0;
2139 
2140  /* divx detection */
2141  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2142  if (e < 2)
2143  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2144  if (e >= 2) {
2145  ctx->divx_version = ver;
2146  ctx->divx_build = build;
2147  s->divx_packed = e == 3 && last == 'p';
2148  }
2149 
2150  /* libavcodec detection */
2151  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2152  if (e != 4)
2153  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2154  if (e != 4) {
2155  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2156  if (e > 1)
2157  build = (ver << 16) + (ver2 << 8) + ver3;
2158  }
2159  if (e != 4) {
2160  if (strcmp(buf, "ffmpeg") == 0)
2161  ctx->lavc_build = 4600;
2162  }
2163  if (e == 4)
2164  ctx->lavc_build = build;
2165 
2166  /* Xvid detection */
2167  e = sscanf(buf, "XviD%d", &build);
2168  if (e == 1)
2169  ctx->xvid_build = build;
2170 
2171  return 0;
2172 }
2173 
2175 {
2176  Mpeg4DecContext *ctx = avctx->priv_data;
2177  MpegEncContext *s = &ctx->m;
2178 
2179  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2180  if (s->codec_tag == AV_RL32("XVID") ||
2181  s->codec_tag == AV_RL32("XVIX") ||
2182  s->codec_tag == AV_RL32("RMP4") ||
2183  s->codec_tag == AV_RL32("ZMP4") ||
2184  s->codec_tag == AV_RL32("SIPP"))
2185  ctx->xvid_build = 0;
2186  }
2187 
2188  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2189  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2190  ctx->vol_control_parameters == 0)
2191  ctx->divx_version = 400; // divx 4
2192 
2193  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2194  ctx->divx_version =
2195  ctx->divx_build = -1;
2196  }
2197 
2199  if (s->codec_tag == AV_RL32("XVIX"))
2201 
2202  if (s->codec_tag == AV_RL32("UMP4"))
2204 
2205  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2207 
2208  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2210 
2211  if (ctx->xvid_build <= 3U)
2212  s->padding_bug_score = 256 * 256 * 256 * 64;
2213 
2214  if (ctx->xvid_build <= 1U)
2216 
2217  if (ctx->xvid_build <= 12U)
2219 
2220  if (ctx->xvid_build <= 32U)
2222 
2223 #define SET_QPEL_FUNC(postfix1, postfix2) \
2224  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2225  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2226  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2227 
2228  if (ctx->lavc_build < 4653U)
2230 
2231  if (ctx->lavc_build < 4655U)
2233 
2234  if (ctx->lavc_build < 4670U)
2236 
2237  if (ctx->lavc_build <= 4712U)
2239 
2240  if ((ctx->lavc_build&0xFF) >= 100) {
2241  if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2242  (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2243  )
2245  }
2246 
2247  if (ctx->divx_version >= 0)
2249  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2250  s->padding_bug_score = 256 * 256 * 256 * 64;
2251 
2252  if (ctx->divx_version < 500U)
2254 
2255  if (ctx->divx_version >= 0)
2257  }
2258 
2259  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2260  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2261  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2262  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2263  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2264  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2265  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2266 
2267  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2268  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2269  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2270  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2271  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2272  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2273  }
2274 
2275  if (avctx->debug & FF_DEBUG_BUGS)
2277  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2278  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2279  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2280 
2281  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2282  s->codec_id == AV_CODEC_ID_MPEG4 &&
2283  avctx->idct_algo == FF_IDCT_AUTO) {
2284  avctx->idct_algo = FF_IDCT_XVID;
2285  ff_mpv_idct_init(s);
2286  return 1;
2287  }
2288 
2289  return 0;
2290 }
2291 
2293 {
2294  MpegEncContext *s = &ctx->m;
2295  int time_incr, time_increment;
2296  int64_t pts;
2297 
2298  s->mcsel = 0;
2299  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2300  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2302  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2303  s->low_delay = 0;
2304  }
2305 
2307  if (s->partitioned_frame)
2309  else
2311 
2312  time_incr = 0;
2313  while (get_bits1(gb) != 0)
2314  time_incr++;
2315 
2316  check_marker(s->avctx, gb, "before time_increment");
2317 
2318  if (ctx->time_increment_bits == 0 ||
2319  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2321  "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);
2322 
2323  for (ctx->time_increment_bits = 1;
2324  ctx->time_increment_bits < 16;
2325  ctx->time_increment_bits++) {
2326  if (s->pict_type == AV_PICTURE_TYPE_P ||
2327  (s->pict_type == AV_PICTURE_TYPE_S &&
2328  ctx->vol_sprite_usage == GMC_SPRITE)) {
2329  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2330  break;
2331  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2332  break;
2333  }
2334 
2336  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2337  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2338  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2340  }
2341  }
2342 
2343  if (IS_3IV1)
2344  time_increment = get_bits1(gb); // FIXME investigate further
2345  else
2346  time_increment = get_bits(gb, ctx->time_increment_bits);
2347 
2348  if (s->pict_type != AV_PICTURE_TYPE_B) {
2349  s->last_time_base = s->time_base;
2350  s->time_base += time_incr;
2351  s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2352  if (s->workaround_bugs & FF_BUG_UMP4) {
2353  if (s->time < s->last_non_b_time) {
2354  /* header is not mpeg-4-compatible, broken encoder,
2355  * trying to workaround */
2356  s->time_base++;
2357  s->time += s->avctx->framerate.num;
2358  }
2359  }
2360  s->pp_time = s->time - s->last_non_b_time;
2361  s->last_non_b_time = s->time;
2362  } else {
2363  s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2364  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2365  if (s->pp_time <= s->pb_time ||
2366  s->pp_time <= s->pp_time - s->pb_time ||
2367  s->pp_time <= 0) {
2368  /* messed up order, maybe after seeking? skipping current B-frame */
2369  return FRAME_SKIPPED;
2370  }
2372 
2373  if (ctx->t_frame == 0)
2374  ctx->t_frame = s->pb_time;
2375  if (ctx->t_frame == 0)
2376  ctx->t_frame = 1; // 1/0 protection
2377  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2378  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2379  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2380  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2381  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2382  s->pb_field_time = 2;
2383  s->pp_field_time = 4;
2384  if (!s->progressive_sequence)
2385  return FRAME_SKIPPED;
2386  }
2387  }
2388 
2389  if (s->avctx->framerate.den)
2390  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2391  else
2392  pts = AV_NOPTS_VALUE;
2393  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2394 
2395  check_marker(s->avctx, gb, "before vop_coded");
2396 
2397  /* vop coded */
2398  if (get_bits1(gb) != 1) {
2399  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2400  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2401  return FRAME_SKIPPED;
2402  }
2403  if (ctx->new_pred)
2404  decode_new_pred(ctx, gb);
2405 
2406  if (ctx->shape != BIN_ONLY_SHAPE &&
2407  (s->pict_type == AV_PICTURE_TYPE_P ||
2408  (s->pict_type == AV_PICTURE_TYPE_S &&
2409  ctx->vol_sprite_usage == GMC_SPRITE))) {
2410  /* rounding type for motion estimation */
2411  s->no_rounding = get_bits1(gb);
2412  } else {
2413  s->no_rounding = 0;
2414  }
2415  // FIXME reduced res stuff
2416 
2417  if (ctx->shape != RECT_SHAPE) {
2418  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2419  skip_bits(gb, 13); /* width */
2420  check_marker(s->avctx, gb, "after width");
2421  skip_bits(gb, 13); /* height */
2422  check_marker(s->avctx, gb, "after height");
2423  skip_bits(gb, 13); /* hor_spat_ref */
2424  check_marker(s->avctx, gb, "after hor_spat_ref");
2425  skip_bits(gb, 13); /* ver_spat_ref */
2426  }
2427  skip_bits1(gb); /* change_CR_disable */
2428 
2429  if (get_bits1(gb) != 0)
2430  skip_bits(gb, 8); /* constant_alpha_value */
2431  }
2432 
2433  // FIXME complexity estimation stuff
2434 
2435  if (ctx->shape != BIN_ONLY_SHAPE) {
2436  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2437  if (s->pict_type != AV_PICTURE_TYPE_I)
2438  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2439  if (s->pict_type == AV_PICTURE_TYPE_B)
2440  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2441 
2442  if (get_bits_left(gb) < 3) {
2443  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2444  return AVERROR_INVALIDDATA;
2445  }
2446  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2447  if (!s->progressive_sequence) {
2448  s->top_field_first = get_bits1(gb);
2449  s->alternate_scan = get_bits1(gb);
2450  } else
2451  s->alternate_scan = 0;
2452  }
2453 
2454  if (s->alternate_scan) {
2455  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2456  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2457  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2458  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2459  } else {
2460  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2461  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2462  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2463  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2464  }
2465 
2466  if (s->pict_type == AV_PICTURE_TYPE_S) {
2467  if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2468  ctx->vol_sprite_usage == GMC_SPRITE)) {
2469  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2470  return AVERROR_INVALIDDATA;
2471  if (ctx->sprite_brightness_change)
2472  av_log(s->avctx, AV_LOG_ERROR,
2473  "sprite_brightness_change not supported\n");
2474  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2475  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2476  } else {
2477  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2478  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2479  }
2480  }
2481 
2482  if (ctx->shape != BIN_ONLY_SHAPE) {
2483  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2484  if (s->qscale == 0) {
2485  av_log(s->avctx, AV_LOG_ERROR,
2486  "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2487  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2488  }
2489 
2490  if (s->pict_type != AV_PICTURE_TYPE_I) {
2491  s->f_code = get_bits(gb, 3); /* fcode_for */
2492  if (s->f_code == 0) {
2493  av_log(s->avctx, AV_LOG_ERROR,
2494  "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2495  s->f_code = 1;
2496  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2497  }
2498  } else
2499  s->f_code = 1;
2500 
2501  if (s->pict_type == AV_PICTURE_TYPE_B) {
2502  s->b_code = get_bits(gb, 3);
2503  if (s->b_code == 0) {
2504  av_log(s->avctx, AV_LOG_ERROR,
2505  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2506  s->b_code=1;
2507  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2508  }
2509  } else
2510  s->b_code = 1;
2511 
2512  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2513  av_log(s->avctx, AV_LOG_DEBUG,
2514  "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",
2515  s->qscale, s->f_code, s->b_code,
2516  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")),
2517  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2518  s->top_field_first, s->quarter_sample ? "q" : "h",
2519  s->data_partitioning, ctx->resync_marker,
2520  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2521  1 - s->no_rounding, s->vo_type,
2522  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2523  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2524  ctx->cplx_estimation_trash_b,
2525  s->time,
2526  time_increment
2527  );
2528  }
2529 
2530  if (!ctx->scalability) {
2531  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2532  skip_bits1(gb); // vop shape coding type
2533  } else {
2534  if (ctx->enhancement_type) {
2535  int load_backward_shape = get_bits1(gb);
2536  if (load_backward_shape)
2537  av_log(s->avctx, AV_LOG_ERROR,
2538  "load backward shape isn't supported\n");
2539  }
2540  skip_bits(gb, 2); // ref_select_code
2541  }
2542  }
2543  /* detect buggy encoders which don't set the low_delay flag
2544  * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2545  * easily (although it's buggy too) */
2546  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2547  ctx->divx_version == -1 && s->picture_number == 0) {
2548  av_log(s->avctx, AV_LOG_WARNING,
2549  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2550  s->low_delay = 1;
2551  }
2552 
2553  s->picture_number++; // better than pic number==0 always ;)
2554 
2555  // FIXME add short header support
2556  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2557  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2558 
2559  if (s->workaround_bugs & FF_BUG_EDGE) {
2560  s->h_edge_pos = s->width;
2561  s->v_edge_pos = s->height;
2562  }
2563  return 0;
2564 }
2565 
2566 /**
2567  * Decode MPEG-4 headers.
2568  * @return <0 if no VOP found (or a damaged one)
2569  * FRAME_SKIPPED if a not coded VOP is found
2570  * 0 if a VOP is found
2571  */
2573 {
2574  MpegEncContext *s = &ctx->m;
2575  unsigned startcode, v;
2576  int ret;
2577  int vol = 0;
2578 
2579  /* search next start code */
2580  align_get_bits(gb);
2581 
2582  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2583  skip_bits(gb, 24);
2584  if (get_bits(gb, 8) == 0xF0)
2585  goto end;
2586  }
2587 
2588  startcode = 0xff;
2589  for (;;) {
2590  if (get_bits_count(gb) >= gb->size_in_bits) {
2591  if (gb->size_in_bits == 8 &&
2592  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2593  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2594  return FRAME_SKIPPED; // divx bug
2595  } else
2596  return -1; // end of stream
2597  }
2598 
2599  /* use the bits after the test */
2600  v = get_bits(gb, 8);
2601  startcode = ((startcode << 8) | v) & 0xffffffff;
2602 
2603  if ((startcode & 0xFFFFFF00) != 0x100)
2604  continue; // no startcode
2605 
2606  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2607  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2608  if (startcode <= 0x11F)
2609  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2610  else if (startcode <= 0x12F)
2611  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2612  else if (startcode <= 0x13F)
2613  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2614  else if (startcode <= 0x15F)
2615  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2616  else if (startcode <= 0x1AF)
2617  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2618  else if (startcode == 0x1B0)
2619  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2620  else if (startcode == 0x1B1)
2621  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2622  else if (startcode == 0x1B2)
2623  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2624  else if (startcode == 0x1B3)
2625  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2626  else if (startcode == 0x1B4)
2627  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2628  else if (startcode == 0x1B5)
2629  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2630  else if (startcode == 0x1B6)
2631  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2632  else if (startcode == 0x1B7)
2633  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2634  else if (startcode == 0x1B8)
2635  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2636  else if (startcode == 0x1B9)
2637  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2638  else if (startcode == 0x1BA)
2639  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2640  else if (startcode == 0x1BB)
2641  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2642  else if (startcode == 0x1BC)
2643  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2644  else if (startcode == 0x1BD)
2645  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2646  else if (startcode == 0x1BE)
2647  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2648  else if (startcode == 0x1BF)
2649  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2650  else if (startcode == 0x1C0)
2651  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2652  else if (startcode == 0x1C1)
2653  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2654  else if (startcode == 0x1C2)
2655  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2656  else if (startcode == 0x1C3)
2657  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2658  else if (startcode <= 0x1C5)
2659  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2660  else if (startcode <= 0x1FF)
2661  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2662  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2663  }
2664 
2665  if (startcode >= 0x120 && startcode <= 0x12F) {
2666  if (vol) {
2667  av_log(s->avctx, AV_LOG_ERROR, "Multiple VOL headers");
2668  return AVERROR_INVALIDDATA;
2669  }
2670  vol++;
2671  if ((ret = decode_vol_header(ctx, gb)) < 0)
2672  return ret;
2673  } else if (startcode == USER_DATA_STARTCODE) {
2674  decode_user_data(ctx, gb);
2675  } else if (startcode == GOP_STARTCODE) {
2676  mpeg4_decode_gop_header(s, gb);
2677  } else if (startcode == VOS_STARTCODE) {
2679  } else if (startcode == VOP_STARTCODE) {
2680  break;
2681  }
2682 
2683  align_get_bits(gb);
2684  startcode = 0xff;
2685  }
2686 
2687 end:
2689  s->low_delay = 1;
2690  s->avctx->has_b_frames = !s->low_delay;
2691 
2692  return decode_vop_header(ctx, gb);
2693 }
2694 
2696  static int done = 0;
2697 
2698  if (!done) {
2705  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2706  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2707  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2708  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2709  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2710  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2711  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2712  &ff_sprite_trajectory_tab[0][1], 4, 2,
2713  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2714  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2715  &ff_mb_type_b_tab[0][1], 2, 1,
2716  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2717  done = 1;
2718  }
2719 }
2720 
2721 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2722 {
2723  Mpeg4DecContext *ctx = avctx->priv_data;
2724  MpegEncContext *s = &ctx->m;
2725 
2726  /* divx 5.01+ bitstream reorder stuff */
2727  /* Since this clobbers the input buffer and hwaccel codecs still need the
2728  * data during hwaccel->end_frame we should not do this any earlier */
2729  if (s->divx_packed) {
2730  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2731  int startcode_found = 0;
2732 
2733  if (buf_size - current_pos > 7) {
2734 
2735  int i;
2736  for (i = current_pos; i < buf_size - 4; i++)
2737 
2738  if (buf[i] == 0 &&
2739  buf[i + 1] == 0 &&
2740  buf[i + 2] == 1 &&
2741  buf[i + 3] == 0xB6) {
2742  startcode_found = !(buf[i + 4] & 0x40);
2743  break;
2744  }
2745  }
2746 
2747  if (startcode_found) {
2748  if (!ctx->showed_packed_warning) {
2749  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2750  "wasteful way to store B-frames ('packed B-frames'). "
2751  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2752  ctx->showed_packed_warning = 1;
2753  }
2756  buf_size - current_pos);
2757  if (!s->bitstream_buffer) {
2758  s->bitstream_buffer_size = 0;
2759  return AVERROR(ENOMEM);
2760  }
2761  memcpy(s->bitstream_buffer, buf + current_pos,
2762  buf_size - current_pos);
2763  s->bitstream_buffer_size = buf_size - current_pos;
2764  }
2765  }
2766 
2767  return 0;
2768 }
2769 
2770 #if HAVE_THREADS
2771 static int mpeg4_update_thread_context(AVCodecContext *dst,
2772  const AVCodecContext *src)
2773 {
2774  Mpeg4DecContext *s = dst->priv_data;
2775  const Mpeg4DecContext *s1 = src->priv_data;
2776  int init = s->m.context_initialized;
2777 
2778  int ret = ff_mpeg_update_thread_context(dst, src);
2779 
2780  if (ret < 0)
2781  return ret;
2782 
2783  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2784 
2785  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2786  ff_xvid_idct_init(&s->m.idsp, dst);
2787 
2788  return 0;
2789 }
2790 #endif
2791 
2793 {
2794  Mpeg4DecContext *ctx = avctx->priv_data;
2795  MpegEncContext *s = &ctx->m;
2796  int ret;
2797 
2798  ctx->divx_version =
2799  ctx->divx_build =
2800  ctx->xvid_build =
2801  ctx->lavc_build = -1;
2802 
2803  if ((ret = ff_h263_decode_init(avctx)) < 0)
2804  return ret;
2805 
2807 
2808  s->h263_pred = 1;
2809  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2811  ctx->time_increment_bits = 4; /* default value for broken headers */
2812 
2814  avctx->internal->allocate_progress = 1;
2815 
2816  return 0;
2817 }
2818 
2819 static const AVOption mpeg4_options[] = {
2820  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2821  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2822  {NULL}
2823 };
2824 
2825 static const AVClass mpeg4_class = {
2826  .class_name = "MPEG4 Video Decoder",
2827  .item_name = av_default_item_name,
2828  .option = mpeg4_options,
2829  .version = LIBAVUTIL_VERSION_INT,
2830 };
2831 
2833  .name = "mpeg4",
2834  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2835  .type = AVMEDIA_TYPE_VIDEO,
2836  .id = AV_CODEC_ID_MPEG4,
2837  .priv_data_size = sizeof(Mpeg4DecContext),
2838  .init = decode_init,
2839  .close = ff_h263_decode_end,
2844  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2845  .flush = ff_mpeg_flush,
2846  .max_lowres = 3,
2849  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2850  .priv_class = &mpeg4_class,
2851 };
int bitstream_buffer_size
Definition: mpegvideo.h:411
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:397
uint16_t sprite_traj[4][2]
sprite trajectory points
Definition: mpeg4video.h:75
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2621
#define ff_tlog(ctx,...)
Definition: internal.h:80
IDCTDSPContext idsp
Definition: mpegvideo.h:227
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:2991
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2516
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
int aspect_ratio_info
Definition: mpegvideo.h:397
int picture_number
Definition: mpegvideo.h:124
const char * s
Definition: avisynth_c.h:768
#define MB_TYPE_L1
Definition: mpegutils.h:68
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2512
ScanTable intra_v_scantable
Definition: mpegvideo.h:90
static int shift(int a, int b)
Definition: sonic.c:82
S(GMC)-VOP MPEG-4.
Definition: avutil.h:277
RLTable ff_mpeg4_rl_intra
Definition: mpeg4data.h:109
static float alpha(float a)
const uint8_t ff_mpeg4_c_dc_scale_table[32]
Definition: mpeg4data.h:363
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
Definition: pixfmt.h:513
#define CBPY_VLC_BITS
Definition: h263.h:39
AVOption.
Definition: opt.h:246
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:266
static void flush(AVCodecContext *avctx)
#define MB_TYPE_DIRECT2
Definition: mpegutils.h:59
int sprite_warping_accuracy
Definition: mpegvideo.h:398
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG-1 & B-frame MPEG-4
Definition: mpegvideo.h:275
av_cold void ff_mpeg4videodec_static_init(void)
float re
Definition: fft.c:82
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:501
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:86
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:204
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:45
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
int resync_marker
could this stream contain resync markers
Definition: mpeg4video.h:82
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:75
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
int16_t(*[3] ac_val)[16]
used for MPEG-4 AC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:191
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:167
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:407
int num
Numerator.
Definition: rational.h:59
uint8_t * bitstream_buffer
Definition: mpegvideo.h:410
enum AVCodecID codec_id
Definition: mpegvideo.h:109
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2620
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:193
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:37
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2521
const uint8_t * buffer
Definition: get_bits.h:56
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:63
int av_log2(unsigned v)
Definition: intmath.c:26
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1859
static av_cold int decode_init(AVCodecContext *avctx)
#define MB_TYPE_INTRA
Definition: mpegutils.h:73
#define MB_TYPE_16x8
Definition: mpegutils.h:55
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:121
int real_sprite_warping_points
Definition: mpegvideo.h:391
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2614
mpegvideo header.
#define DC_VLC_BITS
Definition: mpeg4videodec.c:44
#define DC_MARKER
Definition: mpeg4video.h:54
uint8_t permutated[64]
Definition: idctdsp.h:33
uint8_t run
Definition: svq3.c:206
#define ER_MV_ERROR
int padding_bug_score
used to detect the VERY common padding bug in MPEG-4
Definition: mpegvideo.h:406
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:498
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:130
#define src
Definition: vp8dsp.c:254
int profile
profile
Definition: avcodec.h:2806
AVCodec.
Definition: avcodec.h:3289
int time_base
time in seconds of last I,P,S Frame
Definition: mpegvideo.h:384
RLTable.
Definition: rl.h:39
int qscale
QP.
Definition: mpegvideo.h:201
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
const AVProfile ff_mpeg4_video_profiles[]
Definition: profiles.c:107
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:307
int field_select[2][2]
Definition: mpegvideo.h:274
int block_wrap[6]
Definition: mpegvideo.h:291
int quant_precision
Definition: mpegvideo.h:395
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:2208
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1603
int vol_sprite_usage
Definition: mpeg4video.h:71
static int16_t block[64]
Definition: dct.c:115
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:980
#define USES_LIST(a, list)
Definition: mpegutils.h:99
#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:356
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:47
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (MPEG-4) ...
Definition: mpegvideo.h:261
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
float delta
AVOptions.
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2562
const uint16_t ff_sprite_trajectory_tab[15][2]
Definition: mpeg4data.h:326
#define VOP_STARTCODE
Definition: mpeg4video.h:60
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
#define IS_3IV1
Definition: mpeg4video.h:170
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:197
Multithreading support functions.
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:874
#define FF_BUG_EDGE
Definition: avcodec.h:2520
int interlaced_dct
Definition: mpegvideo.h:478
#define MB_TYPE_16x16
Definition: mpegutils.h:54
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:177
#define CHROMA_420
Definition: mpegvideo.h:470
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
#define MB_TYPE_ACPRED
Definition: mpegutils.h:60
#define RECT_SHAPE
Definition: mpeg4video.h:33
#define height
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:2518
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2517
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:46
#define ER_MV_END
#define ff_dlog(a,...)
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:330
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:126
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:117
int intra_dc_threshold
QP above which the ac VLC should be used for intra dc.
Definition: mpeg4video.h:92
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2118
#define MAX_LEVEL
Definition: rl.h:36
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:180
#define FF_BUG_IEDGE
Definition: avcodec.h:2525
#define av_log(a,...)
#define MOTION_MARKER
Definition: mpeg4video.h:53
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:728
#define FF_IDCT_AUTO
Definition: avcodec.h:2677
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2579
MpegEncContext m
Definition: mpeg4video.h:66
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:392
#define ROUNDED_DIV(a, b)
Definition: common.h:56
ThreadFrame tf
Definition: mpegpicture.h:47
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2519
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:587
#define FF_IDCT_XVID
Definition: avcodec.h:2684
int16_t * dc_val[3]
used for MPEG-4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:184
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:160
#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:1770
uint8_t * mbskip_table
Definition: mpegpicture.h:59
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:192
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:400
#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:190
ERContext er
Definition: mpegvideo.h:548
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
const char * r
Definition: vf_curves.c:111
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1561
#define SIMPLE_VO_TYPE
Definition: mpeg4video.h:38
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:38
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2514
uint16_t width
Definition: gdv.c:47
#define MB_TYPE_GMC
Definition: mpegutils.h:61
#define FF_DEBUG_BUGS
Definition: avcodec.h:2578
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:3296
#define IS_SKIP(a)
Definition: mpegutils.h:81
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:396
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:401
#define SET_QPEL_FUNC(postfix1, postfix2)
GetBitContext gb
Definition: mpegvideo.h:443
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:497
#define CLOSE_READER(name, gb)
Definition: get_bits.h:131
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1011
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
Definition: get_bits.h:509
Definition: vlc.h:26
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2548
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:175
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:229
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:353
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideodata.c:89
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:61
common internal API header
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:393
#define ADV_SIMPLE_VO_TYPE
Definition: mpeg4video.h:44
const uint8_t ff_mpeg4_DCtab_lum[13][2]
Definition: mpeg4data.h:35
uint8_t ff_mpeg4_static_rl_table_store[3][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg4video.c:28
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:408
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:949
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:51
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2605
#define FFMIN(a, b)
Definition: common.h:96
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
#define IS_DIRECT(a)
Definition: mpegutils.h:84
static VLC dc_lum
Definition: mpeg4videodec.c:47
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2676
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
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:713
AVCodec ff_mpeg4_decoder
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:412
int size_in_bits
Definition: get_bits.h:58
AVFormatContext * ctx
Definition: movenc.c:48
int use_intra_dc_vlc
Definition: mpeg4video.h:89
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:296
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
int level
level
Definition: avcodec.h:2904
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:181
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:554
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:83
int n
Definition: avisynth_c.h:684
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:96
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1612
int vol_control_parameters
does the stream contain the low_delay flag, used to work around buggy encoders.
Definition: mpeg4video.h:104
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:348
#define FRAME_SKIPPED
Return value for header parsers if frame is not coded.
Definition: mpegutils.h:34
uint8_t * mbintra_table
used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
Definition: mpegvideo.h:195
#define MB_TYPE_INTERLACED
Definition: mpegutils.h:58
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2516
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:483
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:193
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:43
#define FF_BUG_UMP4
Definition: avcodec.h:2513
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:290
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define MB_TYPE_8x8
Definition: mpegutils.h:57
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:263
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:431
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:260
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
#define FF_ASPECT_EXTENDED
Definition: h263.h:30
BlockDSPContext bdsp
Definition: mpegvideo.h:223
int debug
debug
Definition: avcodec.h:2561
main external API structure.
Definition: avcodec.h:1481
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define FASTDIV(a, b)
Definition: mathops.h:202
#define RSHIFT(a, b)
Definition: common.h:54
ScanTable intra_scantable
Definition: mpegvideo.h:88
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
static int get_xbits(GetBitContext *s, int n)
Read MPEG-1 dc-style VLC (sign bit + mantissa with no MSB).
Definition: get_bits.h:218
#define OPEN_READER(name, gb)
Definition: get_bits.h:120
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:39
void * buf
Definition: avisynth_c.h:690
#define SLICE_END
end marker found
Definition: mpegvideo.h:500
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:399
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:451
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:313
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:338
Describe the class of an AVClass context structure.
Definition: log.h:67
ScanTable intra_h_scantable
Definition: mpegvideo.h:89
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:306
static const AVProfile profiles[]
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:196
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode MPEG-4 headers.
int context_initialized
Definition: mpegvideo.h:121
#define GET_CACHE(name, gb)
Definition: get_bits.h:197
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2618
RLTable ff_h263_rl_inter
Definition: h263data.c:161
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
#define s1
Definition: regdef.h:38
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:162
const int16_t ff_mpeg4_default_intra_matrix[64]
Definition: mpeg4data.h:337
#define ER_DC_ERROR
int allocate_progress
Whether to allocate progress for frame threading.
Definition: internal.h:154
int f_code
forward MV resolution
Definition: mpegvideo.h:235
#define MB_TYPE_SKIP
Definition: mpegutils.h:62
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:346
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:77
#define MV_DIR_FORWARD
Definition: mpegvideo.h:259
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:956
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2511
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:102
static int64_t pts
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
uint8_t level
Definition: svq3.c:207
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:273
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:128
MpegEncContext.
Definition: mpegvideo.h:78
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:180
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
int8_t * qscale_table
Definition: mpegpicture.h:50
#define MAX_RUN
Definition: rl.h:35
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
static int mpeg4_is_resync(Mpeg4DecContext *ctx)
check if the next stuff is a resync marker or the end.
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:194
static VLC sprite_trajectory
Definition: mpeg4videodec.c:48
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
#define FF_BUG_AMV
Definition: avcodec.h:2515
#define MB_TYPE_L0L1
Definition: mpegutils.h:69
static const AVOption mpeg4_options[]
common internal api header.
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:127
if(ret< 0)
Definition: vf_mcdeint.c:279
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:60
#define TEX_VLC_BITS
Definition: dv.h:96
static VLC dc_chrom
Definition: mpeg4videodec.c:47
Bi-dir predicted.
Definition: avutil.h:276
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:49
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
int den
Denominator.
Definition: rational.h:60
const uint8_t ff_alternate_vertical_scan[64]
static const AVClass mpeg4_class
#define IS_INTRA(x, y)
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:148
void * priv_data
Definition: avcodec.h:1508
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2575
#define IS_8X8(a)
Definition: mpegutils.h:89
int len
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1516
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:354
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:495
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:165
#define IS_ACPRED(a)
Definition: mpegutils.h:94
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:464
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
int chroma_qscale
chroma QP
Definition: mpegvideo.h:202
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:255
#define av_uninit(x)
Definition: attributes.h:148
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:69
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:116
int num_sprite_warping_points
Definition: mpeg4video.h:73
#define stride
#define MV_TYPE_8X8
4 vectors (H.263, MPEG-4 4MV)
Definition: mpegvideo.h:264
int b_code
backward MV resolution for B-frames (MPEG-4)
Definition: mpegvideo.h:236
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2522
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
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:955
#define MB_TYPE_L0
Definition: mpegutils.h:67
for(j=16;j >0;--j)
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
Predicted.
Definition: avutil.h:275
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:37
#define GOP_STARTCODE
Definition: mpeg4video.h:58
#define VOS_STARTCODE
Definition: mpeg4video.h:56
#define GMC_SPRITE
Definition: mpeg4video.h:51