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mpeg4videodec.c
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1 /*
2  * MPEG4 decoder.
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define UNCHECKED_BITSTREAM_READER 1
24 
25 #include "libavutil/opt.h"
26 #include "error_resilience.h"
27 #include "idctdsp.h"
28 #include "internal.h"
29 #include "mpegutils.h"
30 #include "mpegvideo.h"
31 #include "mpegvideodata.h"
32 #include "mpeg4video.h"
33 #include "h263.h"
34 #include "thread.h"
35 #include "xvididct.h"
36 
37 /* The defines below define the number of bits that are read at once for
38  * reading vlc values. Changing these may improve speed and data cache needs
39  * be aware though that decreasing them may need the number of stages that is
40  * passed to get_vlc* to be increased. */
41 #define SPRITE_TRAJ_VLC_BITS 6
42 #define DC_VLC_BITS 9
43 #define MB_TYPE_B_VLC_BITS 4
44 
48 
49 static const int mb_type_b_map[4] = {
54 };
55 
56 /**
57  * Predict the ac.
58  * @param n block index (0-3 are luma, 4-5 are chroma)
59  * @param dir the ac prediction direction
60  */
61 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
62 {
63  int i;
64  int16_t *ac_val, *ac_val1;
65  int8_t *const qscale_table = s->current_picture.qscale_table;
66 
67  /* find prediction */
68  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
69  ac_val1 = ac_val;
70  if (s->ac_pred) {
71  if (dir == 0) {
72  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
73  /* left prediction */
74  ac_val -= 16;
75 
76  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
77  n == 1 || n == 3) {
78  /* same qscale */
79  for (i = 1; i < 8; i++)
80  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
81  } else {
82  /* different qscale, we must rescale */
83  for (i = 1; i < 8; i++)
84  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
85  }
86  } else {
87  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
88  /* top prediction */
89  ac_val -= 16 * s->block_wrap[n];
90 
91  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
92  n == 2 || n == 3) {
93  /* same qscale */
94  for (i = 1; i < 8; i++)
95  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
96  } else {
97  /* different qscale, we must rescale */
98  for (i = 1; i < 8; i++)
99  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
100  }
101  }
102  }
103  /* left copy */
104  for (i = 1; i < 8; i++)
105  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
106 
107  /* top copy */
108  for (i = 1; i < 8; i++)
109  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
110 }
111 
112 /**
113  * check if the next stuff is a resync marker or the end.
114  * @return 0 if not
115  */
116 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
117 {
118  MpegEncContext *s = &ctx->m;
119  int bits_count = get_bits_count(&s->gb);
120  int v = show_bits(&s->gb, 16);
121 
123  return 0;
124 
125  while (v <= 0xFF) {
126  if (s->pict_type == AV_PICTURE_TYPE_B ||
127  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
128  break;
129  skip_bits(&s->gb, 8 + s->pict_type);
130  bits_count += 8 + s->pict_type;
131  v = show_bits(&s->gb, 16);
132  }
133 
134  if (bits_count + 8 >= s->gb.size_in_bits) {
135  v >>= 8;
136  v |= 0x7F >> (7 - (bits_count & 7));
137 
138  if (v == 0x7F)
139  return s->mb_num;
140  } else {
141  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
142  int len, mb_num;
143  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
144  GetBitContext gb = s->gb;
145 
146  skip_bits(&s->gb, 1);
147  align_get_bits(&s->gb);
148 
149  for (len = 0; len < 32; len++)
150  if (get_bits1(&s->gb))
151  break;
152 
153  mb_num = get_bits(&s->gb, mb_num_bits);
154  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
155  mb_num= -1;
156 
157  s->gb = gb;
158 
160  return mb_num;
161  }
162  }
163  return 0;
164 }
165 
167 {
168  MpegEncContext *s = &ctx->m;
169  int a = 2 << s->sprite_warping_accuracy;
170  int rho = 3 - s->sprite_warping_accuracy;
171  int r = 16 / a;
172  int alpha = 0;
173  int beta = 0;
174  int w = s->width;
175  int h = s->height;
176  int min_ab, i, w2, h2, w3, h3;
177  int sprite_ref[4][2];
178  int virtual_ref[2][2];
179 
180  // only true for rectangle shapes
181  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
182  { 0, s->height }, { s->width, s->height } };
183  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
184 
185  if (w <= 0 || h <= 0)
186  return AVERROR_INVALIDDATA;
187 
188  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
189  int length;
190  int x = 0, y = 0;
191 
192  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
193  if (length > 0)
194  x = get_xbits(gb, length);
195 
196  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
197  check_marker(gb, "before sprite_trajectory");
198 
199  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
200  if (length > 0)
201  y = get_xbits(gb, length);
202 
203  check_marker(gb, "after sprite_trajectory");
204  ctx->sprite_traj[i][0] = d[i][0] = x;
205  ctx->sprite_traj[i][1] = d[i][1] = y;
206  }
207  for (; i < 4; i++)
208  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
209 
210  while ((1 << alpha) < w)
211  alpha++;
212  while ((1 << beta) < h)
213  beta++; /* typo in the mpeg4 std for the definition of w' and h' */
214  w2 = 1 << alpha;
215  h2 = 1 << beta;
216 
217  // Note, the 4th point isn't used for GMC
218  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
219  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
220  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
221  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
222  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
223  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
224  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
225  } else {
226  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
227  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
228  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
229  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
230  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
231  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
232  }
233  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
234  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
235 
236  /* this is mostly identical to the mpeg4 std (and is totally unreadable
237  * because of that...). Perhaps it should be reordered to be more readable.
238  * The idea behind this virtual_ref mess is to be able to use shifts later
239  * per pixel instead of divides so the distance between points is converted
240  * from w&h based to w2&h2 based which are of the 2^x form. */
241  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
242  ROUNDED_DIV(((w - w2) *
243  (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
244  w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
245  virtual_ref[0][1] = 16 * vop_ref[0][1] +
246  ROUNDED_DIV(((w - w2) *
247  (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
248  w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
249  virtual_ref[1][0] = 16 * vop_ref[0][0] +
250  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
251  h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
252  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
253  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
254  h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
255 
256  switch (ctx->num_sprite_warping_points) {
257  case 0:
258  s->sprite_offset[0][0] =
259  s->sprite_offset[0][1] =
260  s->sprite_offset[1][0] =
261  s->sprite_offset[1][1] = 0;
262  s->sprite_delta[0][0] = a;
263  s->sprite_delta[0][1] =
264  s->sprite_delta[1][0] = 0;
265  s->sprite_delta[1][1] = a;
266  ctx->sprite_shift[0] =
267  ctx->sprite_shift[1] = 0;
268  break;
269  case 1: // GMC only
270  s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
271  s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
272  s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
273  a * (vop_ref[0][0] / 2);
274  s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
275  a * (vop_ref[0][1] / 2);
276  s->sprite_delta[0][0] = a;
277  s->sprite_delta[0][1] =
278  s->sprite_delta[1][0] = 0;
279  s->sprite_delta[1][1] = a;
280  ctx->sprite_shift[0] =
281  ctx->sprite_shift[1] = 0;
282  break;
283  case 2:
284  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
285  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
286  (-vop_ref[0][0]) +
287  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
288  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
289  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
290  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
291  (-vop_ref[0][0]) +
292  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
293  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
294  s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
295  (-2 * vop_ref[0][0] + 1) +
296  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
297  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
298  sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
299  s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
300  (-2 * vop_ref[0][0] + 1) +
301  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
302  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
303  sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
304  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
305  s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
306  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
307  s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
308 
309  ctx->sprite_shift[0] = alpha + rho;
310  ctx->sprite_shift[1] = alpha + rho + 2;
311  break;
312  case 3:
313  min_ab = FFMIN(alpha, beta);
314  w3 = w2 >> min_ab;
315  h3 = h2 >> min_ab;
316  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
317  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
318  h3 * (-vop_ref[0][0]) +
319  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
320  w3 * (-vop_ref[0][1]) +
321  (1 << (alpha + beta + rho - min_ab - 1));
322  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
323  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
324  h3 * (-vop_ref[0][0]) +
325  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
326  w3 * (-vop_ref[0][1]) +
327  (1 << (alpha + beta + rho - min_ab - 1));
328  s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
329  h3 * (-2 * vop_ref[0][0] + 1) +
330  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
331  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
332  r * sprite_ref[0][0] - 16 * w2 * h3 +
333  (1 << (alpha + beta + rho - min_ab + 1));
334  s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
335  h3 * (-2 * vop_ref[0][0] + 1) +
336  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
337  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
338  r * sprite_ref[0][1] - 16 * w2 * h3 +
339  (1 << (alpha + beta + rho - min_ab + 1));
340  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
341  s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
342  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
343  s->sprite_delta[1][1] = (-r * 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 (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
351  s->sprite_delta[0][1] == 0 &&
352  s->sprite_delta[1][0] == 0 &&
353  s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
354  s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
355  s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
356  s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
357  s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
358  s->sprite_delta[0][0] = a;
359  s->sprite_delta[0][1] = 0;
360  s->sprite_delta[1][0] = 0;
361  s->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  for (i = 0; i < 2; i++) {
369  s->sprite_offset[0][i] <<= shift_y;
370  s->sprite_offset[1][i] <<= shift_c;
371  s->sprite_delta[0][i] <<= shift_y;
372  s->sprite_delta[1][i] <<= shift_y;
373  ctx->sprite_shift[i] = 16;
374  }
376  }
377 
378  return 0;
379 }
380 
382  int len = FFMIN(ctx->time_increment_bits + 3, 15);
383 
384  get_bits(gb, len);
385  if (get_bits1(gb))
386  get_bits(gb, len);
387  check_marker(gb, "after new_pred");
388 
389  return 0;
390 }
391 
392 /**
393  * Decode the next video packet.
394  * @return <0 if something went wrong
395  */
397 {
398  MpegEncContext *s = &ctx->m;
399 
400  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
401  int header_extension = 0, mb_num, len;
402 
403  /* is there enough space left for a video packet + header */
404  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
405  return -1;
406 
407  for (len = 0; len < 32; len++)
408  if (get_bits1(&s->gb))
409  break;
410 
412  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
413  return -1;
414  }
415 
416  if (ctx->shape != RECT_SHAPE) {
417  header_extension = get_bits1(&s->gb);
418  // FIXME more stuff here
419  }
420 
421  mb_num = get_bits(&s->gb, mb_num_bits);
422  if (mb_num >= s->mb_num) {
424  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
425  return -1;
426  }
427 
428  s->mb_x = mb_num % s->mb_width;
429  s->mb_y = mb_num / s->mb_width;
430 
431  if (ctx->shape != BIN_ONLY_SHAPE) {
432  int qscale = get_bits(&s->gb, s->quant_precision);
433  if (qscale)
434  s->chroma_qscale = s->qscale = qscale;
435  }
436 
437  if (ctx->shape == RECT_SHAPE)
438  header_extension = get_bits1(&s->gb);
439 
440  if (header_extension) {
441  int time_incr = 0;
442 
443  while (get_bits1(&s->gb) != 0)
444  time_incr++;
445 
446  check_marker(&s->gb, "before time_increment in video packed header");
447  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
448  check_marker(&s->gb, "before vop_coding_type in video packed header");
449 
450  skip_bits(&s->gb, 2); /* vop coding type */
451  // FIXME not rect stuff here
452 
453  if (ctx->shape != BIN_ONLY_SHAPE) {
454  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
455  // FIXME don't just ignore everything
456  if (s->pict_type == AV_PICTURE_TYPE_S &&
457  ctx->vol_sprite_usage == GMC_SPRITE) {
458  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
459  return AVERROR_INVALIDDATA;
460  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
461  }
462 
463  // FIXME reduced res stuff here
464 
465  if (s->pict_type != AV_PICTURE_TYPE_I) {
466  int f_code = get_bits(&s->gb, 3); /* fcode_for */
467  if (f_code == 0)
469  "Error, video packet header damaged (f_code=0)\n");
470  }
471  if (s->pict_type == AV_PICTURE_TYPE_B) {
472  int b_code = get_bits(&s->gb, 3);
473  if (b_code == 0)
475  "Error, video packet header damaged (b_code=0)\n");
476  }
477  }
478  }
479  if (ctx->new_pred)
480  decode_new_pred(ctx, &s->gb);
481 
482  return 0;
483 }
484 
485 /**
486  * Get the average motion vector for a GMC MB.
487  * @param n either 0 for the x component or 1 for y
488  * @return the average MV for a GMC MB
489  */
490 static inline int get_amv(Mpeg4DecContext *ctx, int n)
491 {
492  MpegEncContext *s = &ctx->m;
493  int x, y, mb_v, sum, dx, dy, shift;
494  int len = 1 << (s->f_code + 4);
495  const int a = s->sprite_warping_accuracy;
496 
497  if (s->workaround_bugs & FF_BUG_AMV)
498  len >>= s->quarter_sample;
499 
500  if (s->real_sprite_warping_points == 1) {
501  if (ctx->divx_version == 500 && ctx->divx_build == 413)
502  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
503  else
504  sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
505  } else {
506  dx = s->sprite_delta[n][0];
507  dy = s->sprite_delta[n][1];
508  shift = ctx->sprite_shift[0];
509  if (n)
510  dy -= 1 << (shift + a + 1);
511  else
512  dx -= 1 << (shift + a + 1);
513  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
514 
515  sum = 0;
516  for (y = 0; y < 16; y++) {
517  int v;
518 
519  v = mb_v + dy * y;
520  // FIXME optimize
521  for (x = 0; x < 16; x++) {
522  sum += v >> shift;
523  v += dx;
524  }
525  }
526  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
527  }
528 
529  if (sum < -len)
530  sum = -len;
531  else if (sum >= len)
532  sum = len - 1;
533 
534  return sum;
535 }
536 
537 /**
538  * Decode the dc value.
539  * @param n block index (0-3 are luma, 4-5 are chroma)
540  * @param dir_ptr the prediction direction will be stored here
541  * @return the quantized dc
542  */
543 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
544 {
545  int level, code;
546 
547  if (n < 4)
548  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
549  else
550  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
551 
552  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
553  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
554  return -1;
555  }
556 
557  if (code == 0) {
558  level = 0;
559  } else {
560  if (IS_3IV1) {
561  if (code == 1)
562  level = 2 * get_bits1(&s->gb) - 1;
563  else {
564  if (get_bits1(&s->gb))
565  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
566  else
567  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
568  }
569  } else {
570  level = get_xbits(&s->gb, code);
571  }
572 
573  if (code > 8) {
574  if (get_bits1(&s->gb) == 0) { /* marker */
576  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
577  return -1;
578  }
579  }
580  }
581  }
582 
583  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
584 }
585 
586 /**
587  * Decode first partition.
588  * @return number of MBs decoded or <0 if an error occurred
589  */
591 {
592  MpegEncContext *s = &ctx->m;
593  int mb_num = 0;
594  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
595 
596  /* decode first partition */
597  s->first_slice_line = 1;
598  for (; s->mb_y < s->mb_height; s->mb_y++) {
600  for (; s->mb_x < s->mb_width; s->mb_x++) {
601  const int xy = s->mb_x + s->mb_y * s->mb_stride;
602  int cbpc;
603  int dir = 0;
604 
605  mb_num++;
607  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
608  s->first_slice_line = 0;
609 
610  if (s->pict_type == AV_PICTURE_TYPE_I) {
611  int i;
612 
613  do {
614  if (show_bits_long(&s->gb, 19) == DC_MARKER)
615  return mb_num - 1;
616 
618  if (cbpc < 0) {
620  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
621  return -1;
622  }
623  } while (cbpc == 8);
624 
625  s->cbp_table[xy] = cbpc & 3;
627  s->mb_intra = 1;
628 
629  if (cbpc & 4)
630  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
631 
632  s->current_picture.qscale_table[xy] = s->qscale;
633 
634  s->mbintra_table[xy] = 1;
635  for (i = 0; i < 6; i++) {
636  int dc_pred_dir;
637  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
638  if (dc < 0) {
640  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
641  return -1;
642  }
643  dir <<= 1;
644  if (dc_pred_dir)
645  dir |= 1;
646  }
647  s->pred_dir_table[xy] = dir;
648  } else { /* P/S_TYPE */
649  int mx, my, pred_x, pred_y, bits;
650  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
651  const int stride = s->b8_stride * 2;
652 
653 try_again:
654  bits = show_bits(&s->gb, 17);
655  if (bits == MOTION_MARKER)
656  return mb_num - 1;
657 
658  skip_bits1(&s->gb);
659  if (bits & 0x10000) {
660  /* skip mb */
661  if (s->pict_type == AV_PICTURE_TYPE_S &&
662  ctx->vol_sprite_usage == GMC_SPRITE) {
664  MB_TYPE_16x16 |
665  MB_TYPE_GMC |
666  MB_TYPE_L0;
667  mx = get_amv(ctx, 0);
668  my = get_amv(ctx, 1);
669  } else {
671  MB_TYPE_16x16 |
672  MB_TYPE_L0;
673  mx = my = 0;
674  }
675  mot_val[0] =
676  mot_val[2] =
677  mot_val[0 + stride] =
678  mot_val[2 + stride] = mx;
679  mot_val[1] =
680  mot_val[3] =
681  mot_val[1 + stride] =
682  mot_val[3 + stride] = my;
683 
684  if (s->mbintra_table[xy])
686  continue;
687  }
688 
690  if (cbpc < 0) {
692  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
693  return -1;
694  }
695  if (cbpc == 20)
696  goto try_again;
697 
698  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
699 
700  s->mb_intra = ((cbpc & 4) != 0);
701 
702  if (s->mb_intra) {
704  s->mbintra_table[xy] = 1;
705  mot_val[0] =
706  mot_val[2] =
707  mot_val[0 + stride] =
708  mot_val[2 + stride] = 0;
709  mot_val[1] =
710  mot_val[3] =
711  mot_val[1 + stride] =
712  mot_val[3 + stride] = 0;
713  } else {
714  if (s->mbintra_table[xy])
716 
717  if (s->pict_type == AV_PICTURE_TYPE_S &&
718  ctx->vol_sprite_usage == GMC_SPRITE &&
719  (cbpc & 16) == 0)
720  s->mcsel = get_bits1(&s->gb);
721  else
722  s->mcsel = 0;
723 
724  if ((cbpc & 16) == 0) {
725  /* 16x16 motion prediction */
726 
727  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
728  if (!s->mcsel) {
729  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
730  if (mx >= 0xffff)
731  return -1;
732 
733  my = ff_h263_decode_motion(s, pred_y, s->f_code);
734  if (my >= 0xffff)
735  return -1;
737  MB_TYPE_L0;
738  } else {
739  mx = get_amv(ctx, 0);
740  my = get_amv(ctx, 1);
742  MB_TYPE_GMC |
743  MB_TYPE_L0;
744  }
745 
746  mot_val[0] =
747  mot_val[2] =
748  mot_val[0 + stride] =
749  mot_val[2 + stride] = mx;
750  mot_val[1] =
751  mot_val[3] =
752  mot_val[1 + stride] =
753  mot_val[3 + stride] = my;
754  } else {
755  int i;
757  MB_TYPE_L0;
758  for (i = 0; i < 4; i++) {
759  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
760  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
761  if (mx >= 0xffff)
762  return -1;
763 
764  my = ff_h263_decode_motion(s, pred_y, s->f_code);
765  if (my >= 0xffff)
766  return -1;
767  mot_val[0] = mx;
768  mot_val[1] = my;
769  }
770  }
771  }
772  }
773  }
774  s->mb_x = 0;
775  }
776 
777  return mb_num;
778 }
779 
780 /**
781  * decode second partition.
782  * @return <0 if an error occurred
783  */
784 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
785 {
786  int mb_num = 0;
787  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
788 
789  s->mb_x = s->resync_mb_x;
790  s->first_slice_line = 1;
791  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
793  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
794  const int xy = s->mb_x + s->mb_y * s->mb_stride;
795 
796  mb_num++;
798  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
799  s->first_slice_line = 0;
800 
801  if (s->pict_type == AV_PICTURE_TYPE_I) {
802  int ac_pred = get_bits1(&s->gb);
803  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
804  if (cbpy < 0) {
806  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
807  return -1;
808  }
809 
810  s->cbp_table[xy] |= cbpy << 2;
811  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
812  } else { /* P || S_TYPE */
813  if (IS_INTRA(s->current_picture.mb_type[xy])) {
814  int i;
815  int dir = 0;
816  int ac_pred = get_bits1(&s->gb);
817  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
818 
819  if (cbpy < 0) {
821  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
822  return -1;
823  }
824 
825  if (s->cbp_table[xy] & 8)
826  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
827  s->current_picture.qscale_table[xy] = s->qscale;
828 
829  for (i = 0; i < 6; i++) {
830  int dc_pred_dir;
831  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
832  if (dc < 0) {
834  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
835  return -1;
836  }
837  dir <<= 1;
838  if (dc_pred_dir)
839  dir |= 1;
840  }
841  s->cbp_table[xy] &= 3; // remove dquant
842  s->cbp_table[xy] |= cbpy << 2;
843  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
844  s->pred_dir_table[xy] = dir;
845  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
846  s->current_picture.qscale_table[xy] = s->qscale;
847  s->cbp_table[xy] = 0;
848  } else {
849  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
850 
851  if (cbpy < 0) {
853  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
854  return -1;
855  }
856 
857  if (s->cbp_table[xy] & 8)
858  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
859  s->current_picture.qscale_table[xy] = s->qscale;
860 
861  s->cbp_table[xy] &= 3; // remove dquant
862  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
863  }
864  }
865  }
866  if (mb_num >= mb_count)
867  return 0;
868  s->mb_x = 0;
869  }
870  return 0;
871 }
872 
873 /**
874  * Decode the first and second partition.
875  * @return <0 if error (and sets error type in the error_status_table)
876  */
878 {
879  MpegEncContext *s = &ctx->m;
880  int mb_num;
881  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
882  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
883 
884  mb_num = mpeg4_decode_partition_a(ctx);
885  if (mb_num < 0) {
887  s->mb_x, s->mb_y, part_a_error);
888  return -1;
889  }
890 
891  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
892  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
894  s->mb_x, s->mb_y, part_a_error);
895  return -1;
896  }
897 
898  s->mb_num_left = mb_num;
899 
900  if (s->pict_type == AV_PICTURE_TYPE_I) {
901  while (show_bits(&s->gb, 9) == 1)
902  skip_bits(&s->gb, 9);
903  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
905  "marker missing after first I partition at %d %d\n",
906  s->mb_x, s->mb_y);
907  return -1;
908  }
909  } else {
910  while (show_bits(&s->gb, 10) == 1)
911  skip_bits(&s->gb, 10);
912  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
914  "marker missing after first P partition at %d %d\n",
915  s->mb_x, s->mb_y);
916  return -1;
917  }
918  }
920  s->mb_x - 1, s->mb_y, part_a_end);
921 
922  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
923  if (s->pict_type == AV_PICTURE_TYPE_P)
925  s->mb_x, s->mb_y, ER_DC_ERROR);
926  return -1;
927  } else {
928  if (s->pict_type == AV_PICTURE_TYPE_P)
930  s->mb_x - 1, s->mb_y, ER_DC_END);
931  }
932 
933  return 0;
934 }
935 
936 /**
937  * Decode a block.
938  * @return <0 if an error occurred
939  */
940 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
941  int n, int coded, int intra, int rvlc)
942 {
943  MpegEncContext *s = &ctx->m;
944  int level, i, last, run, qmul, qadd;
945  int av_uninit(dc_pred_dir);
946  RLTable *rl;
947  RL_VLC_ELEM *rl_vlc;
948  const uint8_t *scan_table;
949 
950  // Note intra & rvlc should be optimized away if this is inlined
951 
952  if (intra) {
953  if (ctx->use_intra_dc_vlc) {
954  /* DC coef */
955  if (s->partitioned_frame) {
956  level = s->dc_val[0][s->block_index[n]];
957  if (n < 4)
958  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
959  else
960  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
961  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
962  } else {
963  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
964  if (level < 0)
965  return -1;
966  }
967  block[0] = level;
968  i = 0;
969  } else {
970  i = -1;
971  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
972  }
973  if (!coded)
974  goto not_coded;
975 
976  if (rvlc) {
977  rl = &ff_rvlc_rl_intra;
978  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
979  } else {
980  rl = &ff_mpeg4_rl_intra;
981  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
982  }
983  if (s->ac_pred) {
984  if (dc_pred_dir == 0)
985  scan_table = s->intra_v_scantable.permutated; /* left */
986  else
987  scan_table = s->intra_h_scantable.permutated; /* top */
988  } else {
989  scan_table = s->intra_scantable.permutated;
990  }
991  qmul = 1;
992  qadd = 0;
993  } else {
994  i = -1;
995  if (!coded) {
996  s->block_last_index[n] = i;
997  return 0;
998  }
999  if (rvlc)
1000  rl = &ff_rvlc_rl_inter;
1001  else
1002  rl = &ff_h263_rl_inter;
1003 
1004  scan_table = s->intra_scantable.permutated;
1005 
1006  if (s->mpeg_quant) {
1007  qmul = 1;
1008  qadd = 0;
1009  if (rvlc)
1010  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1011  else
1012  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1013  } else {
1014  qmul = s->qscale << 1;
1015  qadd = (s->qscale - 1) | 1;
1016  if (rvlc)
1017  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1018  else
1019  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1020  }
1021  }
1022  {
1023  OPEN_READER(re, &s->gb);
1024  for (;;) {
1025  UPDATE_CACHE(re, &s->gb);
1026  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1027  if (level == 0) {
1028  /* escape */
1029  if (rvlc) {
1030  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1032  "1. marker bit missing in rvlc esc\n");
1033  return -1;
1034  }
1035  SKIP_CACHE(re, &s->gb, 1);
1036 
1037  last = SHOW_UBITS(re, &s->gb, 1);
1038  SKIP_CACHE(re, &s->gb, 1);
1039  run = SHOW_UBITS(re, &s->gb, 6);
1040  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1041  UPDATE_CACHE(re, &s->gb);
1042 
1043  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1045  "2. marker bit missing in rvlc esc\n");
1046  return -1;
1047  }
1048  SKIP_CACHE(re, &s->gb, 1);
1049 
1050  level = SHOW_UBITS(re, &s->gb, 11);
1051  SKIP_CACHE(re, &s->gb, 11);
1052 
1053  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1054  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1055  return -1;
1056  }
1057  SKIP_CACHE(re, &s->gb, 5);
1058 
1059  level = level * qmul + qadd;
1060  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1061  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1062 
1063  i += run + 1;
1064  if (last)
1065  i += 192;
1066  } else {
1067  int cache;
1068  cache = GET_CACHE(re, &s->gb);
1069 
1070  if (IS_3IV1)
1071  cache ^= 0xC0000000;
1072 
1073  if (cache & 0x80000000) {
1074  if (cache & 0x40000000) {
1075  /* third escape */
1076  SKIP_CACHE(re, &s->gb, 2);
1077  last = SHOW_UBITS(re, &s->gb, 1);
1078  SKIP_CACHE(re, &s->gb, 1);
1079  run = SHOW_UBITS(re, &s->gb, 6);
1080  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1081  UPDATE_CACHE(re, &s->gb);
1082 
1083  if (IS_3IV1) {
1084  level = SHOW_SBITS(re, &s->gb, 12);
1085  LAST_SKIP_BITS(re, &s->gb, 12);
1086  } else {
1087  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1089  "1. marker bit missing in 3. esc\n");
1090  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1091  return -1;
1092  }
1093  SKIP_CACHE(re, &s->gb, 1);
1094 
1095  level = SHOW_SBITS(re, &s->gb, 12);
1096  SKIP_CACHE(re, &s->gb, 12);
1097 
1098  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1100  "2. marker bit missing in 3. esc\n");
1101  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1102  return -1;
1103  }
1104 
1105  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1106  }
1107 
1108 #if 0
1109  if (s->error_recognition >= FF_ER_COMPLIANT) {
1110  const int abs_level= FFABS(level);
1111  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1112  const int run1= run - rl->max_run[last][abs_level] - 1;
1113  if (abs_level <= rl->max_level[last][run]) {
1114  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1115  return -1;
1116  }
1117  if (s->error_recognition > FF_ER_COMPLIANT) {
1118  if (abs_level <= rl->max_level[last][run]*2) {
1119  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1120  return -1;
1121  }
1122  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1123  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1124  return -1;
1125  }
1126  }
1127  }
1128  }
1129 #endif
1130  if (level > 0)
1131  level = level * qmul + qadd;
1132  else
1133  level = level * qmul - qadd;
1134 
1135  if ((unsigned)(level + 2048) > 4095) {
1137  if (level > 2560 || level < -2560) {
1139  "|level| overflow in 3. esc, qp=%d\n",
1140  s->qscale);
1141  return -1;
1142  }
1143  }
1144  level = level < 0 ? -2048 : 2047;
1145  }
1146 
1147  i += run + 1;
1148  if (last)
1149  i += 192;
1150  } else {
1151  /* second escape */
1152  SKIP_BITS(re, &s->gb, 2);
1153  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1154  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1155  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1156  LAST_SKIP_BITS(re, &s->gb, 1);
1157  }
1158  } else {
1159  /* first escape */
1160  SKIP_BITS(re, &s->gb, 1);
1161  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1162  i += run;
1163  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1164  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1165  LAST_SKIP_BITS(re, &s->gb, 1);
1166  }
1167  }
1168  } else {
1169  i += run;
1170  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1171  LAST_SKIP_BITS(re, &s->gb, 1);
1172  }
1173  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1174  if (i > 62) {
1175  i -= 192;
1176  if (i & (~63)) {
1178  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1179  return -1;
1180  }
1181 
1182  block[scan_table[i]] = level;
1183  break;
1184  }
1185 
1186  block[scan_table[i]] = level;
1187  }
1188  CLOSE_READER(re, &s->gb);
1189  }
1190 
1191 not_coded:
1192  if (intra) {
1193  if (!ctx->use_intra_dc_vlc) {
1194  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1195 
1196  i -= i >> 31; // if (i == -1) i = 0;
1197  }
1198 
1199  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1200  if (s->ac_pred)
1201  i = 63; // FIXME not optimal
1202  }
1203  s->block_last_index[n] = i;
1204  return 0;
1205 }
1206 
1207 /**
1208  * decode partition C of one MB.
1209  * @return <0 if an error occurred
1210  */
1212 {
1213  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1214  int cbp, mb_type;
1215  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1216 
1217  mb_type = s->current_picture.mb_type[xy];
1218  cbp = s->cbp_table[xy];
1219 
1220  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1221 
1222  if (s->current_picture.qscale_table[xy] != s->qscale)
1224 
1225  if (s->pict_type == AV_PICTURE_TYPE_P ||
1226  s->pict_type == AV_PICTURE_TYPE_S) {
1227  int i;
1228  for (i = 0; i < 4; i++) {
1229  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1230  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1231  }
1232  s->mb_intra = IS_INTRA(mb_type);
1233 
1234  if (IS_SKIP(mb_type)) {
1235  /* skip mb */
1236  for (i = 0; i < 6; i++)
1237  s->block_last_index[i] = -1;
1238  s->mv_dir = MV_DIR_FORWARD;
1239  s->mv_type = MV_TYPE_16X16;
1241  && ctx->vol_sprite_usage == GMC_SPRITE) {
1242  s->mcsel = 1;
1243  s->mb_skipped = 0;
1244  } else {
1245  s->mcsel = 0;
1246  s->mb_skipped = 1;
1247  }
1248  } else if (s->mb_intra) {
1250  } else if (!s->mb_intra) {
1251  // s->mcsel = 0; // FIXME do we need to init that?
1252 
1253  s->mv_dir = MV_DIR_FORWARD;
1254  if (IS_8X8(mb_type)) {
1255  s->mv_type = MV_TYPE_8X8;
1256  } else {
1257  s->mv_type = MV_TYPE_16X16;
1258  }
1259  }
1260  } else { /* I-Frame */
1261  s->mb_intra = 1;
1263  }
1264 
1265  if (!IS_SKIP(mb_type)) {
1266  int i;
1267  s->bdsp.clear_blocks(s->block[0]);
1268  /* decode each block */
1269  for (i = 0; i < 6; i++) {
1270  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1272  "texture corrupted at %d %d %d\n",
1273  s->mb_x, s->mb_y, s->mb_intra);
1274  return -1;
1275  }
1276  cbp += cbp;
1277  }
1278  }
1279 
1280  /* per-MB end of slice check */
1281  if (--s->mb_num_left <= 0) {
1282  if (mpeg4_is_resync(ctx))
1283  return SLICE_END;
1284  else
1285  return SLICE_NOEND;
1286  } else {
1287  if (mpeg4_is_resync(ctx)) {
1288  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1289  if (s->cbp_table[xy + delta])
1290  return SLICE_END;
1291  }
1292  return SLICE_OK;
1293  }
1294 }
1295 
1296 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1297 {
1298  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1299  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1300  int16_t *mot_val;
1301  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1302  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1303 
1304  av_assert2(s->h263_pred);
1305 
1306  if (s->pict_type == AV_PICTURE_TYPE_P ||
1307  s->pict_type == AV_PICTURE_TYPE_S) {
1308  do {
1309  if (get_bits1(&s->gb)) {
1310  /* skip mb */
1311  s->mb_intra = 0;
1312  for (i = 0; i < 6; i++)
1313  s->block_last_index[i] = -1;
1314  s->mv_dir = MV_DIR_FORWARD;
1315  s->mv_type = MV_TYPE_16X16;
1316  if (s->pict_type == AV_PICTURE_TYPE_S &&
1317  ctx->vol_sprite_usage == GMC_SPRITE) {
1319  MB_TYPE_GMC |
1320  MB_TYPE_16x16 |
1321  MB_TYPE_L0;
1322  s->mcsel = 1;
1323  s->mv[0][0][0] = get_amv(ctx, 0);
1324  s->mv[0][0][1] = get_amv(ctx, 1);
1325  s->mb_skipped = 0;
1326  } else {
1328  MB_TYPE_16x16 |
1329  MB_TYPE_L0;
1330  s->mcsel = 0;
1331  s->mv[0][0][0] = 0;
1332  s->mv[0][0][1] = 0;
1333  s->mb_skipped = 1;
1334  }
1335  goto end;
1336  }
1338  if (cbpc < 0) {
1340  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1341  return -1;
1342  }
1343  } while (cbpc == 20);
1344 
1345  s->bdsp.clear_blocks(s->block[0]);
1346  dquant = cbpc & 8;
1347  s->mb_intra = ((cbpc & 4) != 0);
1348  if (s->mb_intra)
1349  goto intra;
1350 
1351  if (s->pict_type == AV_PICTURE_TYPE_S &&
1352  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1353  s->mcsel = get_bits1(&s->gb);
1354  else
1355  s->mcsel = 0;
1356  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1357  if (cbpy < 0) {
1359  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1360  return AVERROR_INVALIDDATA;
1361  }
1362 
1363  cbp = (cbpc & 3) | (cbpy << 2);
1364  if (dquant)
1365  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1366  if ((!s->progressive_sequence) &&
1367  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1368  s->interlaced_dct = get_bits1(&s->gb);
1369 
1370  s->mv_dir = MV_DIR_FORWARD;
1371  if ((cbpc & 16) == 0) {
1372  if (s->mcsel) {
1374  MB_TYPE_16x16 |
1375  MB_TYPE_L0;
1376  /* 16x16 global motion prediction */
1377  s->mv_type = MV_TYPE_16X16;
1378  mx = get_amv(ctx, 0);
1379  my = get_amv(ctx, 1);
1380  s->mv[0][0][0] = mx;
1381  s->mv[0][0][1] = my;
1382  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1384  MB_TYPE_L0 |
1386  /* 16x8 field motion prediction */
1387  s->mv_type = MV_TYPE_FIELD;
1388 
1389  s->field_select[0][0] = get_bits1(&s->gb);
1390  s->field_select[0][1] = get_bits1(&s->gb);
1391 
1392  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1393 
1394  for (i = 0; i < 2; i++) {
1395  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1396  if (mx >= 0xffff)
1397  return -1;
1398 
1399  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1400  if (my >= 0xffff)
1401  return -1;
1402 
1403  s->mv[0][i][0] = mx;
1404  s->mv[0][i][1] = my;
1405  }
1406  } else {
1408  /* 16x16 motion prediction */
1409  s->mv_type = MV_TYPE_16X16;
1410  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1411  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1412 
1413  if (mx >= 0xffff)
1414  return -1;
1415 
1416  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1417 
1418  if (my >= 0xffff)
1419  return -1;
1420  s->mv[0][0][0] = mx;
1421  s->mv[0][0][1] = my;
1422  }
1423  } else {
1425  s->mv_type = MV_TYPE_8X8;
1426  for (i = 0; i < 4; i++) {
1427  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1428  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1429  if (mx >= 0xffff)
1430  return -1;
1431 
1432  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1433  if (my >= 0xffff)
1434  return -1;
1435  s->mv[0][i][0] = mx;
1436  s->mv[0][i][1] = my;
1437  mot_val[0] = mx;
1438  mot_val[1] = my;
1439  }
1440  }
1441  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1442  int modb1; // first bit of modb
1443  int modb2; // second bit of modb
1444  int mb_type;
1445 
1446  s->mb_intra = 0; // B-frames never contain intra blocks
1447  s->mcsel = 0; // ... true gmc blocks
1448 
1449  if (s->mb_x == 0) {
1450  for (i = 0; i < 2; i++) {
1451  s->last_mv[i][0][0] =
1452  s->last_mv[i][0][1] =
1453  s->last_mv[i][1][0] =
1454  s->last_mv[i][1][1] = 0;
1455  }
1456 
1458  }
1459 
1460  /* if we skipped it in the future P Frame than skip it now too */
1461  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1462 
1463  if (s->mb_skipped) {
1464  /* skip mb */
1465  for (i = 0; i < 6; i++)
1466  s->block_last_index[i] = -1;
1467 
1468  s->mv_dir = MV_DIR_FORWARD;
1469  s->mv_type = MV_TYPE_16X16;
1470  s->mv[0][0][0] =
1471  s->mv[0][0][1] =
1472  s->mv[1][0][0] =
1473  s->mv[1][0][1] = 0;
1475  MB_TYPE_16x16 |
1476  MB_TYPE_L0;
1477  goto end;
1478  }
1479 
1480  modb1 = get_bits1(&s->gb);
1481  if (modb1) {
1482  // like MB_TYPE_B_DIRECT but no vectors coded
1484  cbp = 0;
1485  } else {
1486  modb2 = get_bits1(&s->gb);
1487  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1488  if (mb_type < 0) {
1489  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1490  return -1;
1491  }
1492  mb_type = mb_type_b_map[mb_type];
1493  if (modb2) {
1494  cbp = 0;
1495  } else {
1496  s->bdsp.clear_blocks(s->block[0]);
1497  cbp = get_bits(&s->gb, 6);
1498  }
1499 
1500  if ((!IS_DIRECT(mb_type)) && cbp) {
1501  if (get_bits1(&s->gb))
1502  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1503  }
1504 
1505  if (!s->progressive_sequence) {
1506  if (cbp)
1507  s->interlaced_dct = get_bits1(&s->gb);
1508 
1509  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1510  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1511  mb_type &= ~MB_TYPE_16x16;
1512 
1513  if (USES_LIST(mb_type, 0)) {
1514  s->field_select[0][0] = get_bits1(&s->gb);
1515  s->field_select[0][1] = get_bits1(&s->gb);
1516  }
1517  if (USES_LIST(mb_type, 1)) {
1518  s->field_select[1][0] = get_bits1(&s->gb);
1519  s->field_select[1][1] = get_bits1(&s->gb);
1520  }
1521  }
1522  }
1523 
1524  s->mv_dir = 0;
1525  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1526  s->mv_type = MV_TYPE_16X16;
1527 
1528  if (USES_LIST(mb_type, 0)) {
1529  s->mv_dir = MV_DIR_FORWARD;
1530 
1531  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1532  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1533  s->last_mv[0][1][0] =
1534  s->last_mv[0][0][0] =
1535  s->mv[0][0][0] = mx;
1536  s->last_mv[0][1][1] =
1537  s->last_mv[0][0][1] =
1538  s->mv[0][0][1] = my;
1539  }
1540 
1541  if (USES_LIST(mb_type, 1)) {
1542  s->mv_dir |= MV_DIR_BACKWARD;
1543 
1544  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1545  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1546  s->last_mv[1][1][0] =
1547  s->last_mv[1][0][0] =
1548  s->mv[1][0][0] = mx;
1549  s->last_mv[1][1][1] =
1550  s->last_mv[1][0][1] =
1551  s->mv[1][0][1] = my;
1552  }
1553  } else if (!IS_DIRECT(mb_type)) {
1554  s->mv_type = MV_TYPE_FIELD;
1555 
1556  if (USES_LIST(mb_type, 0)) {
1557  s->mv_dir = MV_DIR_FORWARD;
1558 
1559  for (i = 0; i < 2; i++) {
1560  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1561  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1562  s->last_mv[0][i][0] =
1563  s->mv[0][i][0] = mx;
1564  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1565  }
1566  }
1567 
1568  if (USES_LIST(mb_type, 1)) {
1569  s->mv_dir |= MV_DIR_BACKWARD;
1570 
1571  for (i = 0; i < 2; i++) {
1572  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1573  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1574  s->last_mv[1][i][0] =
1575  s->mv[1][i][0] = mx;
1576  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1577  }
1578  }
1579  }
1580  }
1581 
1582  if (IS_DIRECT(mb_type)) {
1583  if (IS_SKIP(mb_type)) {
1584  mx =
1585  my = 0;
1586  } else {
1587  mx = ff_h263_decode_motion(s, 0, 1);
1588  my = ff_h263_decode_motion(s, 0, 1);
1589  }
1590 
1592  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1593  }
1594  s->current_picture.mb_type[xy] = mb_type;
1595  } else { /* I-Frame */
1596  do {
1598  if (cbpc < 0) {
1600  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1601  return -1;
1602  }
1603  } while (cbpc == 8);
1604 
1605  dquant = cbpc & 4;
1606  s->mb_intra = 1;
1607 
1608 intra:
1609  s->ac_pred = get_bits1(&s->gb);
1610  if (s->ac_pred)
1612  else
1614 
1615  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1616  if (cbpy < 0) {
1618  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1619  return -1;
1620  }
1621  cbp = (cbpc & 3) | (cbpy << 2);
1622 
1623  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1624 
1625  if (dquant)
1626  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1627 
1628  if (!s->progressive_sequence)
1629  s->interlaced_dct = get_bits1(&s->gb);
1630 
1631  s->bdsp.clear_blocks(s->block[0]);
1632  /* decode each block */
1633  for (i = 0; i < 6; i++) {
1634  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1635  return -1;
1636  cbp += cbp;
1637  }
1638  goto end;
1639  }
1640 
1641  /* decode each block */
1642  for (i = 0; i < 6; i++) {
1643  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1644  return -1;
1645  cbp += cbp;
1646  }
1647 
1648 end:
1649  /* per-MB end of slice check */
1650  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1651  int next = mpeg4_is_resync(ctx);
1652  if (next) {
1653  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1654  return -1;
1655  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1656  return SLICE_END;
1657 
1658  if (s->pict_type == AV_PICTURE_TYPE_B) {
1659  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1661  (s->mb_x + delta >= s->mb_width)
1662  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1663  : s->mb_y, 0);
1664  if (s->next_picture.mbskip_table[xy + delta])
1665  return SLICE_OK;
1666  }
1667 
1668  return SLICE_END;
1669  }
1670  }
1671 
1672  return SLICE_OK;
1673 }
1674 
1676 {
1677  int hours, minutes, seconds;
1678 
1679  if (!show_bits(gb, 23)) {
1680  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1681  return -1;
1682  }
1683 
1684  hours = get_bits(gb, 5);
1685  minutes = get_bits(gb, 6);
1686  check_marker(gb, "in gop_header");
1687  seconds = get_bits(gb, 6);
1688 
1689  s->time_base = seconds + 60*(minutes + 60*hours);
1690 
1691  skip_bits1(gb);
1692  skip_bits1(gb);
1693 
1694  return 0;
1695 }
1696 
1698 {
1699 
1700  s->avctx->profile = get_bits(gb, 4);
1701  s->avctx->level = get_bits(gb, 4);
1702 
1703  // for Simple profile, level 0
1704  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1705  s->avctx->level = 0;
1706  }
1707 
1708  return 0;
1709 }
1710 
1712 {
1713  MpegEncContext *s = &ctx->m;
1714  int width, height, vo_ver_id;
1715 
1716  /* vol header */
1717  skip_bits(gb, 1); /* random access */
1718  s->vo_type = get_bits(gb, 8);
1719  if (get_bits1(gb) != 0) { /* is_ol_id */
1720  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1721  skip_bits(gb, 3); /* vo_priority */
1722  } else {
1723  vo_ver_id = 1;
1724  }
1725  s->aspect_ratio_info = get_bits(gb, 4);
1727  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1728  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1729  } else {
1731  }
1732 
1733  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1734  int chroma_format = get_bits(gb, 2);
1735  if (chroma_format != CHROMA_420)
1736  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1737 
1738  s->low_delay = get_bits1(gb);
1739  if (get_bits1(gb)) { /* vbv parameters */
1740  get_bits(gb, 15); /* first_half_bitrate */
1741  check_marker(gb, "after first_half_bitrate");
1742  get_bits(gb, 15); /* latter_half_bitrate */
1743  check_marker(gb, "after latter_half_bitrate");
1744  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1745  check_marker(gb, "after first_half_vbv_buffer_size");
1746  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1747  get_bits(gb, 11); /* first_half_vbv_occupancy */
1748  check_marker(gb, "after first_half_vbv_occupancy");
1749  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1750  check_marker(gb, "after latter_half_vbv_occupancy");
1751  }
1752  } else {
1753  /* is setting low delay flag only once the smartest thing to do?
1754  * low delay detection won't be overridden. */
1755  if (s->picture_number == 0)
1756  s->low_delay = 0;
1757  }
1758 
1759  ctx->shape = get_bits(gb, 2); /* vol shape */
1760  if (ctx->shape != RECT_SHAPE)
1761  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1762  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1763  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1764  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1765  }
1766 
1767  check_marker(gb, "before time_increment_resolution");
1768 
1769  s->avctx->framerate.num = get_bits(gb, 16);
1770  if (!s->avctx->framerate.num) {
1771  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1772  return AVERROR_INVALIDDATA;
1773  }
1774 
1775  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1776  if (ctx->time_increment_bits < 1)
1777  ctx->time_increment_bits = 1;
1778 
1779  check_marker(gb, "before fixed_vop_rate");
1780 
1781  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1783  else
1784  s->avctx->framerate.den = 1;
1785 
1787 
1788  ctx->t_frame = 0;
1789 
1790  if (ctx->shape != BIN_ONLY_SHAPE) {
1791  if (ctx->shape == RECT_SHAPE) {
1792  check_marker(gb, "before width");
1793  width = get_bits(gb, 13);
1794  check_marker(gb, "before height");
1795  height = get_bits(gb, 13);
1796  check_marker(gb, "after height");
1797  if (width && height && /* they should be non zero but who knows */
1798  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1799  if (s->width && s->height &&
1800  (s->width != width || s->height != height))
1801  s->context_reinit = 1;
1802  s->width = width;
1803  s->height = height;
1804  }
1805  }
1806 
1807  s->progressive_sequence =
1808  s->progressive_frame = get_bits1(gb) ^ 1;
1809  s->interlaced_dct = 0;
1810  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1811  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1812  "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1813  if (vo_ver_id == 1)
1814  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1815  else
1816  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1817 
1818  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1819  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1820  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1821  ctx->vol_sprite_usage == GMC_SPRITE) {
1822  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1823  skip_bits(gb, 13); // sprite_width
1824  check_marker(gb, "after sprite_width");
1825  skip_bits(gb, 13); // sprite_height
1826  check_marker(gb, "after sprite_height");
1827  skip_bits(gb, 13); // sprite_left
1828  check_marker(gb, "after sprite_left");
1829  skip_bits(gb, 13); // sprite_top
1830  check_marker(gb, "after sprite_top");
1831  }
1832  ctx->num_sprite_warping_points = get_bits(gb, 6);
1833  if (ctx->num_sprite_warping_points > 3) {
1834  av_log(s->avctx, AV_LOG_ERROR,
1835  "%d sprite_warping_points\n",
1836  ctx->num_sprite_warping_points);
1837  ctx->num_sprite_warping_points = 0;
1838  return AVERROR_INVALIDDATA;
1839  }
1840  s->sprite_warping_accuracy = get_bits(gb, 2);
1841  ctx->sprite_brightness_change = get_bits1(gb);
1842  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1843  skip_bits1(gb); // low_latency_sprite
1844  }
1845  // FIXME sadct disable bit if verid!=1 && shape not rect
1846 
1847  if (get_bits1(gb) == 1) { /* not_8_bit */
1848  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1849  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1850  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1851  if (s->quant_precision != 5)
1852  av_log(s->avctx, AV_LOG_ERROR,
1853  "quant precision %d\n", s->quant_precision);
1854  if (s->quant_precision<3 || s->quant_precision>9) {
1855  s->quant_precision = 5;
1856  }
1857  } else {
1858  s->quant_precision = 5;
1859  }
1860 
1861  // FIXME a bunch of grayscale shape things
1862 
1863  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1864  int i, v;
1865 
1866  /* load default matrixes */
1867  for (i = 0; i < 64; i++) {
1868  int j = s->idsp.idct_permutation[i];
1870  s->intra_matrix[j] = v;
1871  s->chroma_intra_matrix[j] = v;
1872 
1874  s->inter_matrix[j] = v;
1875  s->chroma_inter_matrix[j] = v;
1876  }
1877 
1878  /* load custom intra matrix */
1879  if (get_bits1(gb)) {
1880  int last = 0;
1881  for (i = 0; i < 64; i++) {
1882  int j;
1883  v = get_bits(gb, 8);
1884  if (v == 0)
1885  break;
1886 
1887  last = v;
1888  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1889  s->intra_matrix[j] = last;
1890  s->chroma_intra_matrix[j] = last;
1891  }
1892 
1893  /* replicate last value */
1894  for (; i < 64; i++) {
1895  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1896  s->intra_matrix[j] = last;
1897  s->chroma_intra_matrix[j] = last;
1898  }
1899  }
1900 
1901  /* load custom non intra matrix */
1902  if (get_bits1(gb)) {
1903  int last = 0;
1904  for (i = 0; i < 64; i++) {
1905  int j;
1906  v = get_bits(gb, 8);
1907  if (v == 0)
1908  break;
1909 
1910  last = v;
1911  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1912  s->inter_matrix[j] = v;
1913  s->chroma_inter_matrix[j] = v;
1914  }
1915 
1916  /* replicate last value */
1917  for (; i < 64; i++) {
1918  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1919  s->inter_matrix[j] = last;
1920  s->chroma_inter_matrix[j] = last;
1921  }
1922  }
1923 
1924  // FIXME a bunch of grayscale shape things
1925  }
1926 
1927  if (vo_ver_id != 1)
1928  s->quarter_sample = get_bits1(gb);
1929  else
1930  s->quarter_sample = 0;
1931 
1932  if (get_bits_left(gb) < 4) {
1933  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1934  return AVERROR_INVALIDDATA;
1935  }
1936 
1937  if (!get_bits1(gb)) {
1938  int pos = get_bits_count(gb);
1939  int estimation_method = get_bits(gb, 2);
1940  if (estimation_method < 2) {
1941  if (!get_bits1(gb)) {
1942  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1943  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1944  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1945  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1946  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1947  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1948  }
1949  if (!get_bits1(gb)) {
1950  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1951  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1952  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1953  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1954  }
1955  if (!check_marker(gb, "in complexity estimation part 1")) {
1956  skip_bits_long(gb, pos - get_bits_count(gb));
1957  goto no_cplx_est;
1958  }
1959  if (!get_bits1(gb)) {
1960  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1961  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1962  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1963  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1964  }
1965  if (!get_bits1(gb)) {
1966  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1967  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1968  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1969  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1970  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1971  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1972  }
1973  if (!check_marker(gb, "in complexity estimation part 2")) {
1974  skip_bits_long(gb, pos - get_bits_count(gb));
1975  goto no_cplx_est;
1976  }
1977  if (estimation_method == 1) {
1978  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1979  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1980  }
1981  } else
1982  av_log(s->avctx, AV_LOG_ERROR,
1983  "Invalid Complexity estimation method %d\n",
1984  estimation_method);
1985  } else {
1986 
1987 no_cplx_est:
1988  ctx->cplx_estimation_trash_i =
1989  ctx->cplx_estimation_trash_p =
1990  ctx->cplx_estimation_trash_b = 0;
1991  }
1992 
1993  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1994 
1995  s->data_partitioning = get_bits1(gb);
1996  if (s->data_partitioning)
1997  ctx->rvlc = get_bits1(gb);
1998 
1999  if (vo_ver_id != 1) {
2000  ctx->new_pred = get_bits1(gb);
2001  if (ctx->new_pred) {
2002  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2003  skip_bits(gb, 2); /* requested upstream message type */
2004  skip_bits1(gb); /* newpred segment type */
2005  }
2006  if (get_bits1(gb)) // reduced_res_vop
2007  av_log(s->avctx, AV_LOG_ERROR,
2008  "reduced resolution VOP not supported\n");
2009  } else {
2010  ctx->new_pred = 0;
2011  }
2012 
2013  ctx->scalability = get_bits1(gb);
2014 
2015  if (ctx->scalability) {
2016  GetBitContext bak = *gb;
2017  int h_sampling_factor_n;
2018  int h_sampling_factor_m;
2019  int v_sampling_factor_n;
2020  int v_sampling_factor_m;
2021 
2022  skip_bits1(gb); // hierarchy_type
2023  skip_bits(gb, 4); /* ref_layer_id */
2024  skip_bits1(gb); /* ref_layer_sampling_dir */
2025  h_sampling_factor_n = get_bits(gb, 5);
2026  h_sampling_factor_m = get_bits(gb, 5);
2027  v_sampling_factor_n = get_bits(gb, 5);
2028  v_sampling_factor_m = get_bits(gb, 5);
2029  ctx->enhancement_type = get_bits1(gb);
2030 
2031  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2032  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2033  /* illegal scalability header (VERY broken encoder),
2034  * trying to workaround */
2035  ctx->scalability = 0;
2036  *gb = bak;
2037  } else
2038  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2039 
2040  // bin shape stuff FIXME
2041  }
2042  }
2043 
2044  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2045  av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
2046  s->avctx->framerate.den, s->avctx->framerate.num,
2047  ctx->time_increment_bits,
2048  s->quant_precision,
2049  s->progressive_sequence,
2050  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2051  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2052  );
2053  }
2054 
2055  return 0;
2056 }
2057 
2058 /**
2059  * Decode the user data stuff in the header.
2060  * Also initializes divx/xvid/lavc_version/build.
2061  */
2063 {
2064  MpegEncContext *s = &ctx->m;
2065  char buf[256];
2066  int i;
2067  int e;
2068  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2069  char last;
2070 
2071  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2072  if (show_bits(gb, 23) == 0)
2073  break;
2074  buf[i] = get_bits(gb, 8);
2075  }
2076  buf[i] = 0;
2077 
2078  /* divx detection */
2079  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2080  if (e < 2)
2081  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2082  if (e >= 2) {
2083  ctx->divx_version = ver;
2084  ctx->divx_build = build;
2085  s->divx_packed = e == 3 && last == 'p';
2086  }
2087 
2088  /* libavcodec detection */
2089  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2090  if (e != 4)
2091  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2092  if (e != 4) {
2093  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2094  if (e > 1)
2095  build = (ver << 16) + (ver2 << 8) + ver3;
2096  }
2097  if (e != 4) {
2098  if (strcmp(buf, "ffmpeg") == 0)
2099  ctx->lavc_build = 4600;
2100  }
2101  if (e == 4)
2102  ctx->lavc_build = build;
2103 
2104  /* Xvid detection */
2105  e = sscanf(buf, "XviD%d", &build);
2106  if (e == 1)
2107  ctx->xvid_build = build;
2108 
2109  return 0;
2110 }
2111 
2113 {
2114  Mpeg4DecContext *ctx = avctx->priv_data;
2115  MpegEncContext *s = &ctx->m;
2116 
2117  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2118  if (s->codec_tag == AV_RL32("XVID") ||
2119  s->codec_tag == AV_RL32("XVIX") ||
2120  s->codec_tag == AV_RL32("RMP4") ||
2121  s->codec_tag == AV_RL32("ZMP4") ||
2122  s->codec_tag == AV_RL32("SIPP"))
2123  ctx->xvid_build = 0;
2124  }
2125 
2126  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2127  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2128  ctx->vol_control_parameters == 0)
2129  ctx->divx_version = 400; // divx 4
2130 
2131  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2132  ctx->divx_version =
2133  ctx->divx_build = -1;
2134  }
2135 
2137  if (s->codec_tag == AV_RL32("XVIX"))
2139 
2140  if (s->codec_tag == AV_RL32("UMP4"))
2142 
2143  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2145 
2146  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2148 
2149  if (ctx->xvid_build <= 3U)
2150  s->padding_bug_score = 256 * 256 * 256 * 64;
2151 
2152  if (ctx->xvid_build <= 1U)
2154 
2155  if (ctx->xvid_build <= 12U)
2157 
2158  if (ctx->xvid_build <= 32U)
2160 
2161 #define SET_QPEL_FUNC(postfix1, postfix2) \
2162  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2163  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2164  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2165 
2166  if (ctx->lavc_build < 4653U)
2168 
2169  if (ctx->lavc_build < 4655U)
2171 
2172  if (ctx->lavc_build < 4670U)
2174 
2175  if (ctx->lavc_build <= 4712U)
2177 
2178  if (ctx->divx_version >= 0)
2180  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2181  s->padding_bug_score = 256 * 256 * 256 * 64;
2182 
2183  if (ctx->divx_version < 500U)
2185 
2186  if (ctx->divx_version >= 0)
2188  }
2189 
2190  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2191  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2192  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2193  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2194  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2195  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2196  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2197 
2198  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2199  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2200  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2201  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2202  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2203  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2204  }
2205 
2206  if (avctx->debug & FF_DEBUG_BUGS)
2208  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2209  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2210  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2211 
2212  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2213  s->codec_id == AV_CODEC_ID_MPEG4 &&
2214  avctx->idct_algo == FF_IDCT_AUTO) {
2215  avctx->idct_algo = FF_IDCT_XVID;
2216  ff_mpv_idct_init(s);
2217  return 1;
2218  }
2219 
2220  return 0;
2221 }
2222 
2224 {
2225  MpegEncContext *s = &ctx->m;
2226  int time_incr, time_increment;
2227  int64_t pts;
2228 
2229  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2230  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2231  ctx->vol_control_parameters == 0 && !(s->avctx->flags & CODEC_FLAG_LOW_DELAY)) {
2232  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2233  s->low_delay = 0;
2234  }
2235 
2237  if (s->partitioned_frame)
2239  else
2241 
2242  time_incr = 0;
2243  while (get_bits1(gb) != 0)
2244  time_incr++;
2245 
2246  check_marker(gb, "before time_increment");
2247 
2248  if (ctx->time_increment_bits == 0 ||
2249  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2251  "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);
2252 
2253  for (ctx->time_increment_bits = 1;
2254  ctx->time_increment_bits < 16;
2255  ctx->time_increment_bits++) {
2256  if (s->pict_type == AV_PICTURE_TYPE_P ||
2257  (s->pict_type == AV_PICTURE_TYPE_S &&
2258  ctx->vol_sprite_usage == GMC_SPRITE)) {
2259  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2260  break;
2261  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2262  break;
2263  }
2264 
2266  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2267  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2268  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2270  }
2271  }
2272 
2273  if (IS_3IV1)
2274  time_increment = get_bits1(gb); // FIXME investigate further
2275  else
2276  time_increment = get_bits(gb, ctx->time_increment_bits);
2277 
2278  if (s->pict_type != AV_PICTURE_TYPE_B) {
2279  s->last_time_base = s->time_base;
2280  s->time_base += time_incr;
2281  s->time = s->time_base * s->avctx->framerate.num + time_increment;
2282  if (s->workaround_bugs & FF_BUG_UMP4) {
2283  if (s->time < s->last_non_b_time) {
2284  /* header is not mpeg-4-compatible, broken encoder,
2285  * trying to workaround */
2286  s->time_base++;
2287  s->time += s->avctx->framerate.num;
2288  }
2289  }
2290  s->pp_time = s->time - s->last_non_b_time;
2291  s->last_non_b_time = s->time;
2292  } else {
2293  s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2294  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2295  if (s->pp_time <= s->pb_time ||
2296  s->pp_time <= s->pp_time - s->pb_time ||
2297  s->pp_time <= 0) {
2298  /* messed up order, maybe after seeking? skipping current b-frame */
2299  return FRAME_SKIPPED;
2300  }
2302 
2303  if (ctx->t_frame == 0)
2304  ctx->t_frame = s->pb_time;
2305  if (ctx->t_frame == 0)
2306  ctx->t_frame = 1; // 1/0 protection
2307  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2308  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2309  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2310  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2311  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2312  s->pb_field_time = 2;
2313  s->pp_field_time = 4;
2314  if (!s->progressive_sequence)
2315  return FRAME_SKIPPED;
2316  }
2317  }
2318 
2319  if (s->avctx->framerate.den)
2320  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2321  else
2322  pts = AV_NOPTS_VALUE;
2323  if (s->avctx->debug&FF_DEBUG_PTS)
2324  av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
2325  pts);
2326 
2327  check_marker(gb, "before vop_coded");
2328 
2329  /* vop coded */
2330  if (get_bits1(gb) != 1) {
2331  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2332  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2333  return FRAME_SKIPPED;
2334  }
2335  if (ctx->new_pred)
2336  decode_new_pred(ctx, gb);
2337 
2338  if (ctx->shape != BIN_ONLY_SHAPE &&
2339  (s->pict_type == AV_PICTURE_TYPE_P ||
2340  (s->pict_type == AV_PICTURE_TYPE_S &&
2341  ctx->vol_sprite_usage == GMC_SPRITE))) {
2342  /* rounding type for motion estimation */
2343  s->no_rounding = get_bits1(gb);
2344  } else {
2345  s->no_rounding = 0;
2346  }
2347  // FIXME reduced res stuff
2348 
2349  if (ctx->shape != RECT_SHAPE) {
2350  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2351  skip_bits(gb, 13); /* width */
2352  check_marker(gb, "after width");
2353  skip_bits(gb, 13); /* height */
2354  check_marker(gb, "after height");
2355  skip_bits(gb, 13); /* hor_spat_ref */
2356  check_marker(gb, "after hor_spat_ref");
2357  skip_bits(gb, 13); /* ver_spat_ref */
2358  }
2359  skip_bits1(gb); /* change_CR_disable */
2360 
2361  if (get_bits1(gb) != 0)
2362  skip_bits(gb, 8); /* constant_alpha_value */
2363  }
2364 
2365  // FIXME complexity estimation stuff
2366 
2367  if (ctx->shape != BIN_ONLY_SHAPE) {
2368  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2369  if (s->pict_type != AV_PICTURE_TYPE_I)
2370  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2371  if (s->pict_type == AV_PICTURE_TYPE_B)
2372  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2373 
2374  if (get_bits_left(gb) < 3) {
2375  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2376  return AVERROR_INVALIDDATA;
2377  }
2378  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2379  if (!s->progressive_sequence) {
2380  s->top_field_first = get_bits1(gb);
2381  s->alternate_scan = get_bits1(gb);
2382  } else
2383  s->alternate_scan = 0;
2384  }
2385 
2386  if (s->alternate_scan) {
2387  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2388  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2389  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2390  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2391  } else {
2392  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2393  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2394  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2395  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2396  }
2397 
2398  if (s->pict_type == AV_PICTURE_TYPE_S &&
2399  (ctx->vol_sprite_usage == STATIC_SPRITE ||
2400  ctx->vol_sprite_usage == GMC_SPRITE)) {
2401  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2402  return AVERROR_INVALIDDATA;
2403  if (ctx->sprite_brightness_change)
2404  av_log(s->avctx, AV_LOG_ERROR,
2405  "sprite_brightness_change not supported\n");
2406  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2407  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2408  }
2409 
2410  if (ctx->shape != BIN_ONLY_SHAPE) {
2411  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2412  if (s->qscale == 0) {
2413  av_log(s->avctx, AV_LOG_ERROR,
2414  "Error, header damaged or not MPEG4 header (qscale=0)\n");
2415  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2416  }
2417 
2418  if (s->pict_type != AV_PICTURE_TYPE_I) {
2419  s->f_code = get_bits(gb, 3); /* fcode_for */
2420  if (s->f_code == 0) {
2421  av_log(s->avctx, AV_LOG_ERROR,
2422  "Error, header damaged or not MPEG4 header (f_code=0)\n");
2423  s->f_code = 1;
2424  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2425  }
2426  } else
2427  s->f_code = 1;
2428 
2429  if (s->pict_type == AV_PICTURE_TYPE_B) {
2430  s->b_code = get_bits(gb, 3);
2431  if (s->b_code == 0) {
2432  av_log(s->avctx, AV_LOG_ERROR,
2433  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2434  s->b_code=1;
2435  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2436  }
2437  } else
2438  s->b_code = 1;
2439 
2440  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2441  av_log(s->avctx, AV_LOG_DEBUG,
2442  "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",
2443  s->qscale, s->f_code, s->b_code,
2444  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")),
2445  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2446  s->top_field_first, s->quarter_sample ? "q" : "h",
2447  s->data_partitioning, ctx->resync_marker,
2448  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2449  1 - s->no_rounding, s->vo_type,
2450  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2451  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2452  ctx->cplx_estimation_trash_b,
2453  s->time,
2454  time_increment
2455  );
2456  }
2457 
2458  if (!ctx->scalability) {
2459  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2460  skip_bits1(gb); // vop shape coding type
2461  } else {
2462  if (ctx->enhancement_type) {
2463  int load_backward_shape = get_bits1(gb);
2464  if (load_backward_shape)
2465  av_log(s->avctx, AV_LOG_ERROR,
2466  "load backward shape isn't supported\n");
2467  }
2468  skip_bits(gb, 2); // ref_select_code
2469  }
2470  }
2471  /* detect buggy encoders which don't set the low_delay flag
2472  * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2473  * easily (although it's buggy too) */
2474  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2475  ctx->divx_version == -1 && s->picture_number == 0) {
2476  av_log(s->avctx, AV_LOG_WARNING,
2477  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2478  s->low_delay = 1;
2479  }
2480 
2481  s->picture_number++; // better than pic number==0 always ;)
2482 
2483  // FIXME add short header support
2484  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2485  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2486 
2487  if (s->workaround_bugs & FF_BUG_EDGE) {
2488  s->h_edge_pos = s->width;
2489  s->v_edge_pos = s->height;
2490  }
2491  return 0;
2492 }
2493 
2494 /**
2495  * Decode mpeg4 headers.
2496  * @return <0 if no VOP found (or a damaged one)
2497  * FRAME_SKIPPED if a not coded VOP is found
2498  * 0 if a VOP is found
2499  */
2501 {
2502  MpegEncContext *s = &ctx->m;
2503  unsigned startcode, v;
2504  int ret;
2505 
2506  /* search next start code */
2507  align_get_bits(gb);
2508 
2509  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2510  skip_bits(gb, 24);
2511  if (get_bits(gb, 8) == 0xF0)
2512  goto end;
2513  }
2514 
2515  startcode = 0xff;
2516  for (;;) {
2517  if (get_bits_count(gb) >= gb->size_in_bits) {
2518  if (gb->size_in_bits == 8 &&
2519  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2520  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2521  return FRAME_SKIPPED; // divx bug
2522  } else
2523  return -1; // end of stream
2524  }
2525 
2526  /* use the bits after the test */
2527  v = get_bits(gb, 8);
2528  startcode = ((startcode << 8) | v) & 0xffffffff;
2529 
2530  if ((startcode & 0xFFFFFF00) != 0x100)
2531  continue; // no startcode
2532 
2533  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2534  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2535  if (startcode <= 0x11F)
2536  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2537  else if (startcode <= 0x12F)
2538  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2539  else if (startcode <= 0x13F)
2540  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2541  else if (startcode <= 0x15F)
2542  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2543  else if (startcode <= 0x1AF)
2544  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2545  else if (startcode == 0x1B0)
2546  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2547  else if (startcode == 0x1B1)
2548  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2549  else if (startcode == 0x1B2)
2550  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2551  else if (startcode == 0x1B3)
2552  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2553  else if (startcode == 0x1B4)
2554  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2555  else if (startcode == 0x1B5)
2556  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2557  else if (startcode == 0x1B6)
2558  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2559  else if (startcode == 0x1B7)
2560  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2561  else if (startcode == 0x1B8)
2562  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2563  else if (startcode == 0x1B9)
2564  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2565  else if (startcode == 0x1BA)
2566  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2567  else if (startcode == 0x1BB)
2568  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2569  else if (startcode == 0x1BC)
2570  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2571  else if (startcode == 0x1BD)
2572  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2573  else if (startcode == 0x1BE)
2574  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2575  else if (startcode == 0x1BF)
2576  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2577  else if (startcode == 0x1C0)
2578  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2579  else if (startcode == 0x1C1)
2580  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2581  else if (startcode == 0x1C2)
2582  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2583  else if (startcode == 0x1C3)
2584  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2585  else if (startcode <= 0x1C5)
2586  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2587  else if (startcode <= 0x1FF)
2588  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2589  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2590  }
2591 
2592  if (startcode >= 0x120 && startcode <= 0x12F) {
2593  if ((ret = decode_vol_header(ctx, gb)) < 0)
2594  return ret;
2595  } else if (startcode == USER_DATA_STARTCODE) {
2596  decode_user_data(ctx, gb);
2597  } else if (startcode == GOP_STARTCODE) {
2598  mpeg4_decode_gop_header(s, gb);
2599  } else if (startcode == VOS_STARTCODE) {
2601  } else if (startcode == VOP_STARTCODE) {
2602  break;
2603  }
2604 
2605  align_get_bits(gb);
2606  startcode = 0xff;
2607  }
2608 
2609 end:
2610  if (s->avctx->flags & CODEC_FLAG_LOW_DELAY)
2611  s->low_delay = 1;
2612  s->avctx->has_b_frames = !s->low_delay;
2613 
2614  return decode_vop_header(ctx, gb);
2615 }
2616 
2618  static int done = 0;
2619 
2620  if (!done) {
2627  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2628  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2629  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2630  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2631  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2632  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2633  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2634  &ff_sprite_trajectory_tab[0][1], 4, 2,
2635  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2636  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2637  &ff_mb_type_b_tab[0][1], 2, 1,
2638  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2639  done = 1;
2640  }
2641 }
2642 
2643 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2644 {
2645  Mpeg4DecContext *ctx = avctx->priv_data;
2646  MpegEncContext *s = &ctx->m;
2647 
2648  /* divx 5.01+ bitstream reorder stuff */
2649  /* Since this clobbers the input buffer and hwaccel codecs still need the
2650  * data during hwaccel->end_frame we should not do this any earlier */
2651  if (s->divx_packed) {
2652  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2653  int startcode_found = 0;
2654 
2655  if (buf_size - current_pos > 7) {
2656 
2657  int i;
2658  for (i = current_pos; i < buf_size - 4; i++)
2659 
2660  if (buf[i] == 0 &&
2661  buf[i + 1] == 0 &&
2662  buf[i + 2] == 1 &&
2663  buf[i + 3] == 0xB6) {
2664  startcode_found = !(buf[i + 4] & 0x40);
2665  break;
2666  }
2667  }
2668 
2669  if (startcode_found) {
2670  if (!ctx->showed_packed_warning) {
2671  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2672  "wasteful way to store B-frames ('packed B-frames'). "
2673  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2674  ctx->showed_packed_warning = 1;
2675  }
2678  buf_size - current_pos);
2679  if (!s->bitstream_buffer) {
2680  s->bitstream_buffer_size = 0;
2681  return AVERROR(ENOMEM);
2682  }
2683  memcpy(s->bitstream_buffer, buf + current_pos,
2684  buf_size - current_pos);
2685  s->bitstream_buffer_size = buf_size - current_pos;
2686  }
2687  }
2688 
2689  return 0;
2690 }
2691 
2693  const AVCodecContext *src)
2694 {
2695  Mpeg4DecContext *s = dst->priv_data;
2696  const Mpeg4DecContext *s1 = src->priv_data;
2697  int init = s->m.context_initialized;
2698 
2699  int ret = ff_mpeg_update_thread_context(dst, src);
2700 
2701  if (ret < 0)
2702  return ret;
2703 
2704  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2705 
2706  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2707  ff_xvid_idct_init(&s->m.idsp, dst);
2708 
2709  return 0;
2710 }
2711 
2713 {
2714  Mpeg4DecContext *ctx = avctx->priv_data;
2715  MpegEncContext *s = &ctx->m;
2716  int ret;
2717 
2718  ctx->divx_version =
2719  ctx->divx_build =
2720  ctx->xvid_build =
2721  ctx->lavc_build = -1;
2722 
2723  if ((ret = ff_h263_decode_init(avctx)) < 0)
2724  return ret;
2725 
2727 
2728  s->h263_pred = 1;
2729  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2731  ctx->time_increment_bits = 4; /* default value for broken headers */
2732 
2734  avctx->internal->allocate_progress = 1;
2735 
2736  return 0;
2737 }
2738 
2740  { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2741  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2742  { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2743  { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2744  { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2745  { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2746  { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2747  { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2748  { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2749  { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2750  { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2751  { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2752  { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2753  { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2754  { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2755  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2756  { FF_PROFILE_UNKNOWN },
2757 };
2758 
2759 static const AVOption mpeg4_options[] = {
2760  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2761  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2762  {NULL}
2763 };
2764 
2765 static const AVClass mpeg4_class = {
2766  "MPEG4 Video Decoder",
2768  mpeg4_options,
2770 };
2771 
2773  .name = "mpeg4",
2774  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2775  .type = AVMEDIA_TYPE_VIDEO,
2776  .id = AV_CODEC_ID_MPEG4,
2777  .priv_data_size = sizeof(Mpeg4DecContext),
2778  .init = decode_init,
2779  .close = ff_h263_decode_end,
2781  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2784  .flush = ff_mpeg_flush,
2785  .max_lowres = 3,
2787  .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2788  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2789  .priv_class = &mpeg4_class,
2790 };
2791 
2792 
2793 #if CONFIG_MPEG4_VDPAU_DECODER
2794 static const AVClass mpeg4_vdpau_class = {
2795  "MPEG4 Video VDPAU Decoder",
2797  mpeg4_options,
2799 };
2800 
2801 AVCodec ff_mpeg4_vdpau_decoder = {
2802  .name = "mpeg4_vdpau",
2803  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2804  .type = AVMEDIA_TYPE_VIDEO,
2805  .id = AV_CODEC_ID_MPEG4,
2806  .priv_data_size = sizeof(Mpeg4DecContext),
2807  .init = decode_init,
2808  .close = ff_h263_decode_end,
2810  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2812  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2813  AV_PIX_FMT_NONE },
2814  .priv_class = &mpeg4_vdpau_class,
2815 };
2816 #endif
#define FF_PROFILE_MPEG4_SCALABLE_TEXTURE
Definition: avcodec.h:2938
int bitstream_buffer_size
Definition: mpegvideo.h:418
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:383
uint16_t sprite_traj[4][2]
sprite trajectory points
Definition: mpeg4video.h:75
#define ff_tlog(ctx,...)
Definition: internal.h:60
IDCTDSPContext idsp
Definition: mpegvideo.h:237
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3069
#define MB_TYPE_SKIP
Definition: avcodec.h:916
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2721
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
float v
int aspect_ratio_info
Definition: mpegvideo.h:404
int picture_number
Definition: mpegvideo.h:134
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ScanTable intra_v_scantable
Definition: mpegvideo.h:100
static int shift(int a, int b)
Definition: sonic.c:82
S(GMC)-VOP MPEG4.
Definition: avutil.h:277
RLTable ff_mpeg4_rl_intra
Definition: mpeg4data.h:109
const uint8_t ff_mpeg4_c_dc_scale_table[32]
Definition: mpeg4data.h:363
mpeg2/4 4:2:0, h264 default for 4:2:0
Definition: pixfmt.h:547
#define FF_PROFILE_MPEG4_ADVANCED_CORE
Definition: avcodec.h:2945
#define CBPY_VLC_BITS
Definition: h263.h:41
#define GET_RL_VLC
Definition: get_bits.h:689
AVOption.
Definition: opt.h:255
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:274
static void flush(AVCodecContext *avctx)
#define FF_PROFILE_MPEG4_MAIN
Definition: avcodec.h:2936
int sprite_warping_accuracy
Definition: mpegvideo.h:405
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG1 & B-frame MPEG4
Definition: mpegvideo.h:283
av_cold void ff_mpeg4videodec_static_init(void)
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:503
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:217
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:43
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 CODEC_CAP_TRUNCATED
Definition: avcodec.h:795
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
int16_t(*[3] ac_val)[16]
used for mpeg4 AC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:201
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:180
#define FF_PROFILE_MPEG4_ADVANCED_SIMPLE
Definition: avcodec.h:2948
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
int num
numerator
Definition: rational.h:44
uint8_t * bitstream_buffer
Definition: mpegvideo.h:417
enum AVCodecID codec_id
Definition: mpegvideo.h:119
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2671
const uint8_t * buffer
Definition: get_bits.h:55
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:61
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:1667
static av_cold int decode_init(AVCodecContext *avctx)
#define MB_TYPE_INTRA
Definition: mpegutils.h:69
#define FF_PROFILE_MPEG4_N_BIT
Definition: avcodec.h:2937
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional FF_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:126
int real_sprite_warping_points
Definition: mpegvideo.h:398
mpegvideo header.
#define DC_VLC_BITS
Definition: mpeg4videodec.c:42
#define DC_MARKER
Definition: mpeg4video.h:54
uint8_t permutated[64]
Definition: idctdsp.h:31
uint8_t run
Definition: svq3.c:149
#define ER_MV_ERROR
int padding_bug_score
used to detect the VERY common padding bug in MPEG4
Definition: mpegvideo.h:413
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:500
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:140
int profile
profile
Definition: avcodec.h:2882
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2564
AVCodec.
Definition: avcodec.h:3239
int time_base
time in seconds of last I,P,S Frame
Definition: mpegvideo.h:391
RLTable.
Definition: rl.h:38
int qscale
QP.
Definition: mpegvideo.h:211
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:310
int field_select[2][2]
Definition: mpegvideo.h:282
int block_wrap[6]
Definition: mpegvideo.h:299
int quant_precision
Definition: mpegvideo.h:402
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:2413
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1395
int vol_sprite_usage
Definition: mpeg4video.h:71
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
#define USES_LIST(a, list)
Definition: mpegutils.h:95
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:2565
#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:363
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:46
#define FF_BUG_UMP4
Definition: avcodec.h:2557
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4) ...
Definition: mpegvideo.h:269
if()
Definition: avfilter.c:975
uint8_t bits
Definition: crc.c:295
uint8_t
#define av_cold
Definition: attributes.h:74
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:63
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
float delta
AVOptions.
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:476
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
const uint16_t ff_sprite_trajectory_tab[15][2]
Definition: mpeg4data.h:326
#define VOP_STARTCODE
Definition: mpeg4video.h:60
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
#define IS_3IV1
Definition: mpeg4video.h:171
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:207
Multithreading support functions.
#define CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:839
#define FF_PROFILE_UNKNOWN
Definition: avcodec.h:2883
int interlaced_dct
Definition: mpegvideo.h:481
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:187
#define CHROMA_420
Definition: mpegvideo.h:473
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:794
#define RECT_SHAPE
Definition: mpeg4video.h:33
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2558
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:45
#define ER_MV_END
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:321
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:136
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:127
int intra_dc_threshold
QP above which the ac VLC should be used for intra dc.
Definition: mpeg4video.h:92
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2009
#define MAX_LEVEL
Definition: rl.h:35
#define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE
Definition: avcodec.h:2940
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:181
#define av_log(a,...)
#define MOTION_MARKER
Definition: mpeg4video.h:53
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:673
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2784
MpegEncContext m
Definition: mpeg4video.h:66
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:399
#define ROUNDED_DIV(a, b)
Definition: common.h:55
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2563
ThreadFrame tf
Definition: mpegpicture.h:47
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2668
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333
#define U(x)
Definition: vp56_arith.h:37
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2566
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:588
int16_t * dc_val[3]
used for mpeg4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:194
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:173
static double alpha(void *priv, double x, double y)
Definition: vf_geq.c:99
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1577
uint8_t * mbskip_table
Definition: mpegpicture.h:59
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:202
#define 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:829
av_default_item_name
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:407
#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:175
ERContext er
Definition: mpegvideo.h:549
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
const char * r
Definition: vf_curves.c:107
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1361
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:40
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2552
#define FF_DEBUG_PTS
Definition: avcodec.h:2623
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:3246
#define IS_SKIP(a)
Definition: mpegutils.h:77
#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE
Definition: avcodec.h:2934
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:403
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:408
#define SET_QPEL_FUNC(postfix1, postfix2)
GetBitContext gb
Definition: mpegvideo.h:448
#define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME
Definition: avcodec.h:2942
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:499
#define CLOSE_READER(name, gb)
Definition: get_bits.h:144
#define FF_PROFILE_MPEG4_HYBRID
Definition: avcodec.h:2941
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
#define CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:762
static int check_marker(GetBitContext *s, const char *msg)
Definition: get_bits.h:393
Definition: get_bits.h:63
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2753
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:188
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:214
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:360
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideodata.c:82
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:62
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2621
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:400
const uint8_t ff_mpeg4_DCtab_lum[13][2]
Definition: mpeg4data.h:35
uint8_t ff_mpeg4_static_rl_table_store[3][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg4video.c:28
#define MB_TYPE_GMC
Definition: avcodec.h:915
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:99
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:409
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:49
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2655
#define FF_PROFILE_MPEG4_SIMPLE
Definition: avcodec.h:2933
#define CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:788
#define MB_TYPE_DIRECT2
Definition: avcodec.h:913
#define FFMIN(a, b)
Definition: common.h:66
float y
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
#define IS_DIRECT(a)
Definition: mpegutils.h:80
static VLC dc_lum
Definition: mpeg4videodec.c:45
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
ret
Definition: avfilter.c:974
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2728
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
#define MB_TYPE_INTERLACED
Definition: avcodec.h:912
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:719
AVCodec ff_mpeg4_decoder
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:419
int size_in_bits
Definition: get_bits.h:57
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:287
#define MB_TYPE_L0L1
Definition: avcodec.h:923
#define FFABS(a)
Definition: common.h:61
int level
level
Definition: avcodec.h:2971
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:194
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:555
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:93
int n
Definition: avisynth_c.h:547
#define MB_TYPE_ACPRED
Definition: avcodec.h:914
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1404
#define MB_TYPE_L1
Definition: avcodec.h:922
int vol_control_parameters
does the stream contain the low_delay flag, used to work around buggy encoders.
Definition: mpeg4video.h:104
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:348
uint8_t * mbintra_table
used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
Definition: mpegvideo.h:205
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:474
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:47
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:206
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:41
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:298
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:271
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:436
#define FF_IDCT_AUTO
Definition: avcodec.h:2729
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:268
#define FF_PROFILE_MPEG4_CORE
Definition: avcodec.h:2935
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
static const AVProfile profiles[]
AVS_Value src
Definition: avisynth_c.h:482
BlockDSPContext bdsp
Definition: mpegvideo.h:233
int debug
debug
Definition: avcodec.h:2607
main external API structure.
Definition: avcodec.h:1266
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define FASTDIV(a, b)
Definition: mathops.h:211
#define RSHIFT(a, b)
Definition: common.h:53
ScanTable intra_scantable
Definition: mpegvideo.h:98
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:107
static int get_xbits(GetBitContext *s, int n)
read mpeg1 dc style vlc (sign bit + mantissa with no MSB).
Definition: get_bits.h:231
#define OPEN_READER(name, gb)
Definition: get_bits.h:133
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:37
#define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE
Definition: avcodec.h:2946
void * buf
Definition: avisynth_c.h:553
MPEG4 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstre...
Definition: pixfmt.h:135
#define SLICE_END
end marker found
Definition: mpegvideo.h:502
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:406
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:456
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
BYTE int const BYTE int int int height
Definition: avisynth_c.h:676
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:329
static int mpeg4_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Describe the class of an AVClass context structure.
Definition: log.h:67
ScanTable intra_h_scantable
Definition: mpegvideo.h:99
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:297
static const AVProfile mpeg4_video_profiles[]
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:206
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2556
rational number numerator/denominator
Definition: rational.h:43
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode mpeg4 headers.
int context_initialized
Definition: mpegvideo.h:131
#define GET_CACHE(name, gb)
Definition: get_bits.h:210
#define MB_TYPE_16x16
Definition: avcodec.h:908
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2569
RLTable ff_h263_rl_inter
Definition: h263data.c:161
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:117
#define s1
Definition: regdef.h:38
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:175
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:121
int f_code
forward MV resolution
Definition: mpegvideo.h:245
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:337
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
#define FF_IDCT_XVID
Definition: avcodec.h:2742
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:77
#define MV_DIR_FORWARD
Definition: mpegvideo.h:267
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:219
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:209
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:112
static int64_t pts
Global timestamp for the audio frames.
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2568
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:133
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1463
uint8_t level
Definition: svq3.c:150
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2608
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:281
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:138
#define FF_BUG_AMV
Definition: avcodec.h:2559
MpegEncContext.
Definition: mpegvideo.h:88
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:190
int8_t * qscale_table
Definition: mpegpicture.h:50
#define MAX_RUN
Definition: rl.h:34
struct AVCodecContext * avctx
Definition: mpegvideo.h:105
static int mpeg4_is_resync(Mpeg4DecContext *ctx)
check if the next stuff is a resync marker or the end.
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:522
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:207
static VLC sprite_trajectory
Definition: mpeg4videodec.c:46
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
static const AVOption mpeg4_options[]
common internal api header.
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:137
#define CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:871
#define TEX_VLC_BITS
Definition: dv.h:93
static VLC dc_chrom
Definition: mpeg4videodec.c:45
#define MB_TYPE_8x8
Definition: avcodec.h:911
Bi-dir predicted.
Definition: avutil.h:276
AVProfile.
Definition: avcodec.h:3227
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2664
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:47
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
int den
denominator
Definition: rational.h:45
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideodata.c:93
#define MB_TYPE_16x8
Definition: avcodec.h:909
static const AVClass mpeg4_class
#define IS_INTRA(x, y)
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:149
void * priv_data
Definition: avcodec.h:1308
float re
Definition: fft-test.c:73
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
#define IS_8X8(a)
Definition: mpegutils.h:85
int len
#define av_log2
Definition: intmath.h:105
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1316
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:361
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:497
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
#define FF_DEBUG_BUGS
Definition: avcodec.h:2627
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:175
#define IS_ACPRED(a)
Definition: mpegutils.h:90
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2670
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:449
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
int chroma_qscale
chroma QP
Definition: mpegvideo.h:212
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:254
#define av_uninit(x)
Definition: attributes.h:141
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO
Definition: avcodec.h:2947
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:69
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:126
#define FRAME_SKIPPED
return value for header parsers if frame is not coded
Definition: mpegvideo.h:61
#define FF_PROFILE_MPEG4_ADVANCED_CODING
Definition: avcodec.h:2944
int num_sprite_warping_points
Definition: mpeg4video.h:73
#define stride
#define MV_TYPE_8X8
4 vectors (h263, mpeg4 4MV)
Definition: mpegvideo.h:272
int b_code
backward MV resolution for B Frames (mpeg4)
Definition: mpegvideo.h:246
#define FF_BUG_EDGE
Definition: avcodec.h:2567
#define FF_PROFILE_MPEG4_CORE_SCALABLE
Definition: avcodec.h:2943
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
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.
for(j=16;j >0;--j)
#define MB_TYPE_L0
Definition: avcodec.h:921
#define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION
Definition: avcodec.h:2939
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
Predicted.
Definition: avutil.h:275
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:39
#define GOP_STARTCODE
Definition: mpeg4video.h:58
#define VOS_STARTCODE
Definition: mpeg4video.h:56
static int width
#define GMC_SPRITE
Definition: mpeg4video.h:51
static int16_t block[64]
Definition: dct-test.c:110