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mpeg4videodec.c
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1 /*
2  * MPEG-4 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define UNCHECKED_BITSTREAM_READER 1
24 
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "error_resilience.h"
28 #include "idctdsp.h"
29 #include "internal.h"
30 #include "mpegutils.h"
31 #include "mpegvideo.h"
32 #include "mpegvideodata.h"
33 #include "mpeg4video.h"
34 #include "h263.h"
35 #include "profiles.h"
36 #include "thread.h"
37 #include "xvididct.h"
38 
39 /* The defines below define the number of bits that are read at once for
40  * reading vlc values. Changing these may improve speed and data cache needs
41  * be aware though that decreasing them may need the number of stages that is
42  * passed to get_vlc* to be increased. */
43 #define SPRITE_TRAJ_VLC_BITS 6
44 #define DC_VLC_BITS 9
45 #define MB_TYPE_B_VLC_BITS 4
46 
50 
51 static const int mb_type_b_map[4] = {
56 };
57 
58 /**
59  * Predict the ac.
60  * @param n block index (0-3 are luma, 4-5 are chroma)
61  * @param dir the ac prediction direction
62  */
63 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
64 {
65  int i;
66  int16_t *ac_val, *ac_val1;
67  int8_t *const qscale_table = s->current_picture.qscale_table;
68 
69  /* find prediction */
70  ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
71  ac_val1 = ac_val;
72  if (s->ac_pred) {
73  if (dir == 0) {
74  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
75  /* left prediction */
76  ac_val -= 16;
77 
78  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
79  n == 1 || n == 3) {
80  /* same qscale */
81  for (i = 1; i < 8; i++)
82  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
83  } else {
84  /* different qscale, we must rescale */
85  for (i = 1; i < 8; i++)
86  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
87  }
88  } else {
89  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
90  /* top prediction */
91  ac_val -= 16 * s->block_wrap[n];
92 
93  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
94  n == 2 || n == 3) {
95  /* same qscale */
96  for (i = 1; i < 8; i++)
97  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
98  } else {
99  /* different qscale, we must rescale */
100  for (i = 1; i < 8; i++)
101  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
102  }
103  }
104  }
105  /* left copy */
106  for (i = 1; i < 8; i++)
107  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
108 
109  /* top copy */
110  for (i = 1; i < 8; i++)
111  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
112 }
113 
114 /**
115  * check if the next stuff is a resync marker or the end.
116  * @return 0 if not
117  */
119 {
120  MpegEncContext *s = &ctx->m;
121  int bits_count = get_bits_count(&s->gb);
122  int v = show_bits(&s->gb, 16);
123 
125  return 0;
126 
127  while (v <= 0xFF) {
128  if (s->pict_type == AV_PICTURE_TYPE_B ||
129  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
130  break;
131  skip_bits(&s->gb, 8 + s->pict_type);
132  bits_count += 8 + s->pict_type;
133  v = show_bits(&s->gb, 16);
134  }
135 
136  if (bits_count + 8 >= s->gb.size_in_bits) {
137  v >>= 8;
138  v |= 0x7F >> (7 - (bits_count & 7));
139 
140  if (v == 0x7F)
141  return s->mb_num;
142  } else {
143  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
144  int len, mb_num;
145  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
146  GetBitContext gb = s->gb;
147 
148  skip_bits(&s->gb, 1);
149  align_get_bits(&s->gb);
150 
151  for (len = 0; len < 32; len++)
152  if (get_bits1(&s->gb))
153  break;
154 
155  mb_num = get_bits(&s->gb, mb_num_bits);
156  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
157  mb_num= -1;
158 
159  s->gb = gb;
160 
162  return mb_num;
163  }
164  }
165  return 0;
166 }
167 
169 {
170  MpegEncContext *s = &ctx->m;
171  int a = 2 << s->sprite_warping_accuracy;
172  int rho = 3 - s->sprite_warping_accuracy;
173  int r = 16 / a;
174  int alpha = 0;
175  int beta = 0;
176  int w = s->width;
177  int h = s->height;
178  int min_ab, i, w2, h2, w3, h3;
179  int sprite_ref[4][2];
180  int virtual_ref[2][2];
181 
182  // only true for rectangle shapes
183  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
184  { 0, s->height }, { s->width, s->height } };
185  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
186 
187  if (w <= 0 || h <= 0)
188  return AVERROR_INVALIDDATA;
189 
190  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
191  int length;
192  int x = 0, y = 0;
193 
194  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
195  if (length > 0)
196  x = get_xbits(gb, length);
197 
198  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
199  check_marker(s->avctx, gb, "before sprite_trajectory");
200 
201  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
202  if (length > 0)
203  y = get_xbits(gb, length);
204 
205  check_marker(s->avctx, gb, "after sprite_trajectory");
206  ctx->sprite_traj[i][0] = d[i][0] = x;
207  ctx->sprite_traj[i][1] = d[i][1] = y;
208  }
209  for (; i < 4; i++)
210  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
211 
212  while ((1 << alpha) < w)
213  alpha++;
214  while ((1 << beta) < h)
215  beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
216  w2 = 1 << alpha;
217  h2 = 1 << beta;
218 
219  // Note, the 4th point isn't used for GMC
220  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
221  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
222  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
223  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
224  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
225  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
226  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
227  } else {
228  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
229  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
230  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
231  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
232  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
233  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
234  }
235  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
236  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
237 
238  /* This is mostly identical to the MPEG-4 std (and is totally unreadable
239  * because of that...). Perhaps it should be reordered to be more readable.
240  * The idea behind this virtual_ref mess is to be able to use shifts later
241  * per pixel instead of divides so the distance between points is converted
242  * from w&h based to w2&h2 based which are of the 2^x form. */
243  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
244  ROUNDED_DIV(((w - w2) *
245  (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
246  w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
247  virtual_ref[0][1] = 16 * vop_ref[0][1] +
248  ROUNDED_DIV(((w - w2) *
249  (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
250  w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
251  virtual_ref[1][0] = 16 * vop_ref[0][0] +
252  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
253  h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
254  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
255  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
256  h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
257 
258  switch (ctx->num_sprite_warping_points) {
259  case 0:
260  s->sprite_offset[0][0] =
261  s->sprite_offset[0][1] =
262  s->sprite_offset[1][0] =
263  s->sprite_offset[1][1] = 0;
264  s->sprite_delta[0][0] = a;
265  s->sprite_delta[0][1] =
266  s->sprite_delta[1][0] = 0;
267  s->sprite_delta[1][1] = a;
268  ctx->sprite_shift[0] =
269  ctx->sprite_shift[1] = 0;
270  break;
271  case 1: // GMC only
272  s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
273  s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
274  s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
275  a * (vop_ref[0][0] / 2);
276  s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
277  a * (vop_ref[0][1] / 2);
278  s->sprite_delta[0][0] = a;
279  s->sprite_delta[0][1] =
280  s->sprite_delta[1][0] = 0;
281  s->sprite_delta[1][1] = a;
282  ctx->sprite_shift[0] =
283  ctx->sprite_shift[1] = 0;
284  break;
285  case 2:
286  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
287  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
288  (-vop_ref[0][0]) +
289  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
290  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
291  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
292  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
293  (-vop_ref[0][0]) +
294  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
295  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
296  s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
297  (-2 * vop_ref[0][0] + 1) +
298  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
299  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
300  sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
301  s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
302  (-2 * vop_ref[0][0] + 1) +
303  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
304  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
305  sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
306  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
307  s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
308  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
309  s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
310 
311  ctx->sprite_shift[0] = alpha + rho;
312  ctx->sprite_shift[1] = alpha + rho + 2;
313  break;
314  case 3:
315  min_ab = FFMIN(alpha, beta);
316  w3 = w2 >> min_ab;
317  h3 = h2 >> min_ab;
318  s->sprite_offset[0][0] = (sprite_ref[0][0] * (1<<(alpha + beta + rho - min_ab))) +
319  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
320  h3 * (-vop_ref[0][0]) +
321  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
322  w3 * (-vop_ref[0][1]) +
323  (1 << (alpha + beta + rho - min_ab - 1));
324  s->sprite_offset[0][1] = (sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
325  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
326  h3 * (-vop_ref[0][0]) +
327  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
328  w3 * (-vop_ref[0][1]) +
329  (1 << (alpha + beta + rho - min_ab - 1));
330  s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
331  h3 * (-2 * vop_ref[0][0] + 1) +
332  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
333  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
334  r * sprite_ref[0][0] - 16 * w2 * h3 +
335  (1 << (alpha + beta + rho - min_ab + 1));
336  s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
337  h3 * (-2 * vop_ref[0][0] + 1) +
338  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
339  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
340  r * sprite_ref[0][1] - 16 * w2 * h3 +
341  (1 << (alpha + beta + rho - min_ab + 1));
342  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
343  s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
344  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
345  s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
346 
347  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
348  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
349  break;
350  }
351  /* try to simplify the situation */
352  if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
353  s->sprite_delta[0][1] == 0 &&
354  s->sprite_delta[1][0] == 0 &&
355  s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
356  s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
357  s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
358  s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
359  s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
360  s->sprite_delta[0][0] = a;
361  s->sprite_delta[0][1] = 0;
362  s->sprite_delta[1][0] = 0;
363  s->sprite_delta[1][1] = a;
364  ctx->sprite_shift[0] = 0;
365  ctx->sprite_shift[1] = 0;
367  } else {
368  int shift_y = 16 - ctx->sprite_shift[0];
369  int shift_c = 16 - ctx->sprite_shift[1];
370  for (i = 0; i < 2; i++) {
371  s->sprite_offset[0][i] *= 1 << shift_y;
372  s->sprite_offset[1][i] *= 1 << shift_c;
373  s->sprite_delta[0][i] *= 1 << shift_y;
374  s->sprite_delta[1][i] *= 1 << shift_y;
375  ctx->sprite_shift[i] = 16;
376  }
378  }
379 
380  return 0;
381 }
382 
384  MpegEncContext *s = &ctx->m;
385  int len = FFMIN(ctx->time_increment_bits + 3, 15);
386 
387  get_bits(gb, len);
388  if (get_bits1(gb))
389  get_bits(gb, len);
390  check_marker(s->avctx, gb, "after new_pred");
391 
392  return 0;
393 }
394 
395 /**
396  * Decode the next video packet.
397  * @return <0 if something went wrong
398  */
400 {
401  MpegEncContext *s = &ctx->m;
402 
403  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
404  int header_extension = 0, mb_num, len;
405 
406  /* is there enough space left for a video packet + header */
407  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
408  return -1;
409 
410  for (len = 0; len < 32; len++)
411  if (get_bits1(&s->gb))
412  break;
413 
415  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
416  return -1;
417  }
418 
419  if (ctx->shape != RECT_SHAPE) {
420  header_extension = get_bits1(&s->gb);
421  // FIXME more stuff here
422  }
423 
424  mb_num = get_bits(&s->gb, mb_num_bits);
425  if (mb_num >= s->mb_num) {
427  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
428  return -1;
429  }
430 
431  s->mb_x = mb_num % s->mb_width;
432  s->mb_y = mb_num / s->mb_width;
433 
434  if (ctx->shape != BIN_ONLY_SHAPE) {
435  int qscale = get_bits(&s->gb, s->quant_precision);
436  if (qscale)
437  s->chroma_qscale = s->qscale = qscale;
438  }
439 
440  if (ctx->shape == RECT_SHAPE)
441  header_extension = get_bits1(&s->gb);
442 
443  if (header_extension) {
444  int time_incr = 0;
445 
446  while (get_bits1(&s->gb) != 0)
447  time_incr++;
448 
449  check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
450  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
451  check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
452 
453  skip_bits(&s->gb, 2); /* vop coding type */
454  // FIXME not rect stuff here
455 
456  if (ctx->shape != BIN_ONLY_SHAPE) {
457  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
458  // FIXME don't just ignore everything
459  if (s->pict_type == AV_PICTURE_TYPE_S &&
460  ctx->vol_sprite_usage == GMC_SPRITE) {
461  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
462  return AVERROR_INVALIDDATA;
463  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
464  }
465 
466  // FIXME reduced res stuff here
467 
468  if (s->pict_type != AV_PICTURE_TYPE_I) {
469  int f_code = get_bits(&s->gb, 3); /* fcode_for */
470  if (f_code == 0)
472  "Error, video packet header damaged (f_code=0)\n");
473  }
474  if (s->pict_type == AV_PICTURE_TYPE_B) {
475  int b_code = get_bits(&s->gb, 3);
476  if (b_code == 0)
478  "Error, video packet header damaged (b_code=0)\n");
479  }
480  }
481  }
482  if (ctx->new_pred)
483  decode_new_pred(ctx, &s->gb);
484 
485  return 0;
486 }
487 
488 /**
489  * Get the average motion vector for a GMC MB.
490  * @param n either 0 for the x component or 1 for y
491  * @return the average MV for a GMC MB
492  */
493 static inline int get_amv(Mpeg4DecContext *ctx, int n)
494 {
495  MpegEncContext *s = &ctx->m;
496  int x, y, mb_v, sum, dx, dy, shift;
497  int len = 1 << (s->f_code + 4);
498  const int a = s->sprite_warping_accuracy;
499 
500  if (s->workaround_bugs & FF_BUG_AMV)
501  len >>= s->quarter_sample;
502 
503  if (s->real_sprite_warping_points == 1) {
504  if (ctx->divx_version == 500 && ctx->divx_build == 413)
505  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
506  else
507  sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
508  } else {
509  dx = s->sprite_delta[n][0];
510  dy = s->sprite_delta[n][1];
511  shift = ctx->sprite_shift[0];
512  if (n)
513  dy -= 1 << (shift + a + 1);
514  else
515  dx -= 1 << (shift + a + 1);
516  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
517 
518  sum = 0;
519  for (y = 0; y < 16; y++) {
520  int v;
521 
522  v = mb_v + dy * y;
523  // FIXME optimize
524  for (x = 0; x < 16; x++) {
525  sum += v >> shift;
526  v += dx;
527  }
528  }
529  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
530  }
531 
532  if (sum < -len)
533  sum = -len;
534  else if (sum >= len)
535  sum = len - 1;
536 
537  return sum;
538 }
539 
540 /**
541  * Decode the dc value.
542  * @param n block index (0-3 are luma, 4-5 are chroma)
543  * @param dir_ptr the prediction direction will be stored here
544  * @return the quantized dc
545  */
546 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
547 {
548  int level, code;
549 
550  if (n < 4)
551  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
552  else
553  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
554 
555  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
556  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
557  return -1;
558  }
559 
560  if (code == 0) {
561  level = 0;
562  } else {
563  if (IS_3IV1) {
564  if (code == 1)
565  level = 2 * get_bits1(&s->gb) - 1;
566  else {
567  if (get_bits1(&s->gb))
568  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
569  else
570  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
571  }
572  } else {
573  level = get_xbits(&s->gb, code);
574  }
575 
576  if (code > 8) {
577  if (get_bits1(&s->gb) == 0) { /* marker */
579  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
580  return -1;
581  }
582  }
583  }
584  }
585 
586  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
587 }
588 
589 /**
590  * Decode first partition.
591  * @return number of MBs decoded or <0 if an error occurred
592  */
594 {
595  MpegEncContext *s = &ctx->m;
596  int mb_num = 0;
597  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
598 
599  /* decode first partition */
600  s->first_slice_line = 1;
601  for (; s->mb_y < s->mb_height; s->mb_y++) {
603  for (; s->mb_x < s->mb_width; s->mb_x++) {
604  const int xy = s->mb_x + s->mb_y * s->mb_stride;
605  int cbpc;
606  int dir = 0;
607 
608  mb_num++;
610  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
611  s->first_slice_line = 0;
612 
613  if (s->pict_type == AV_PICTURE_TYPE_I) {
614  int i;
615 
616  do {
617  if (show_bits_long(&s->gb, 19) == DC_MARKER)
618  return mb_num - 1;
619 
621  if (cbpc < 0) {
623  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
624  return -1;
625  }
626  } while (cbpc == 8);
627 
628  s->cbp_table[xy] = cbpc & 3;
630  s->mb_intra = 1;
631 
632  if (cbpc & 4)
633  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
634 
635  s->current_picture.qscale_table[xy] = s->qscale;
636 
637  s->mbintra_table[xy] = 1;
638  for (i = 0; i < 6; i++) {
639  int dc_pred_dir;
640  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
641  if (dc < 0) {
643  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
644  return -1;
645  }
646  dir <<= 1;
647  if (dc_pred_dir)
648  dir |= 1;
649  }
650  s->pred_dir_table[xy] = dir;
651  } else { /* P/S_TYPE */
652  int mx, my, pred_x, pred_y, bits;
653  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
654  const int stride = s->b8_stride * 2;
655 
656 try_again:
657  bits = show_bits(&s->gb, 17);
658  if (bits == MOTION_MARKER)
659  return mb_num - 1;
660 
661  skip_bits1(&s->gb);
662  if (bits & 0x10000) {
663  /* skip mb */
664  if (s->pict_type == AV_PICTURE_TYPE_S &&
665  ctx->vol_sprite_usage == GMC_SPRITE) {
667  MB_TYPE_16x16 |
668  MB_TYPE_GMC |
669  MB_TYPE_L0;
670  mx = get_amv(ctx, 0);
671  my = get_amv(ctx, 1);
672  } else {
674  MB_TYPE_16x16 |
675  MB_TYPE_L0;
676  mx = my = 0;
677  }
678  mot_val[0] =
679  mot_val[2] =
680  mot_val[0 + stride] =
681  mot_val[2 + stride] = mx;
682  mot_val[1] =
683  mot_val[3] =
684  mot_val[1 + stride] =
685  mot_val[3 + stride] = my;
686 
687  if (s->mbintra_table[xy])
689  continue;
690  }
691 
693  if (cbpc < 0) {
695  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
696  return -1;
697  }
698  if (cbpc == 20)
699  goto try_again;
700 
701  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
702 
703  s->mb_intra = ((cbpc & 4) != 0);
704 
705  if (s->mb_intra) {
707  s->mbintra_table[xy] = 1;
708  mot_val[0] =
709  mot_val[2] =
710  mot_val[0 + stride] =
711  mot_val[2 + stride] = 0;
712  mot_val[1] =
713  mot_val[3] =
714  mot_val[1 + stride] =
715  mot_val[3 + stride] = 0;
716  } else {
717  if (s->mbintra_table[xy])
719 
720  if (s->pict_type == AV_PICTURE_TYPE_S &&
721  ctx->vol_sprite_usage == GMC_SPRITE &&
722  (cbpc & 16) == 0)
723  s->mcsel = get_bits1(&s->gb);
724  else
725  s->mcsel = 0;
726 
727  if ((cbpc & 16) == 0) {
728  /* 16x16 motion prediction */
729 
730  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
731  if (!s->mcsel) {
732  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
733  if (mx >= 0xffff)
734  return -1;
735 
736  my = ff_h263_decode_motion(s, pred_y, s->f_code);
737  if (my >= 0xffff)
738  return -1;
740  MB_TYPE_L0;
741  } else {
742  mx = get_amv(ctx, 0);
743  my = get_amv(ctx, 1);
745  MB_TYPE_GMC |
746  MB_TYPE_L0;
747  }
748 
749  mot_val[0] =
750  mot_val[2] =
751  mot_val[0 + stride] =
752  mot_val[2 + stride] = mx;
753  mot_val[1] =
754  mot_val[3] =
755  mot_val[1 + stride] =
756  mot_val[3 + stride] = my;
757  } else {
758  int i;
760  MB_TYPE_L0;
761  for (i = 0; i < 4; i++) {
762  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
763  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
764  if (mx >= 0xffff)
765  return -1;
766 
767  my = ff_h263_decode_motion(s, pred_y, s->f_code);
768  if (my >= 0xffff)
769  return -1;
770  mot_val[0] = mx;
771  mot_val[1] = my;
772  }
773  }
774  }
775  }
776  }
777  s->mb_x = 0;
778  }
779 
780  return mb_num;
781 }
782 
783 /**
784  * decode second partition.
785  * @return <0 if an error occurred
786  */
787 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
788 {
789  int mb_num = 0;
790  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
791 
792  s->mb_x = s->resync_mb_x;
793  s->first_slice_line = 1;
794  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
796  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
797  const int xy = s->mb_x + s->mb_y * s->mb_stride;
798 
799  mb_num++;
801  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
802  s->first_slice_line = 0;
803 
804  if (s->pict_type == AV_PICTURE_TYPE_I) {
805  int ac_pred = get_bits1(&s->gb);
806  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
807  if (cbpy < 0) {
809  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
810  return -1;
811  }
812 
813  s->cbp_table[xy] |= cbpy << 2;
814  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
815  } else { /* P || S_TYPE */
816  if (IS_INTRA(s->current_picture.mb_type[xy])) {
817  int i;
818  int dir = 0;
819  int ac_pred = get_bits1(&s->gb);
820  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
821 
822  if (cbpy < 0) {
824  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
825  return -1;
826  }
827 
828  if (s->cbp_table[xy] & 8)
829  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
830  s->current_picture.qscale_table[xy] = s->qscale;
831 
832  for (i = 0; i < 6; i++) {
833  int dc_pred_dir;
834  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
835  if (dc < 0) {
837  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
838  return -1;
839  }
840  dir <<= 1;
841  if (dc_pred_dir)
842  dir |= 1;
843  }
844  s->cbp_table[xy] &= 3; // remove dquant
845  s->cbp_table[xy] |= cbpy << 2;
846  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
847  s->pred_dir_table[xy] = dir;
848  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
849  s->current_picture.qscale_table[xy] = s->qscale;
850  s->cbp_table[xy] = 0;
851  } else {
852  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
853 
854  if (cbpy < 0) {
856  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
857  return -1;
858  }
859 
860  if (s->cbp_table[xy] & 8)
861  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
862  s->current_picture.qscale_table[xy] = s->qscale;
863 
864  s->cbp_table[xy] &= 3; // remove dquant
865  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
866  }
867  }
868  }
869  if (mb_num >= mb_count)
870  return 0;
871  s->mb_x = 0;
872  }
873  return 0;
874 }
875 
876 /**
877  * Decode the first and second partition.
878  * @return <0 if error (and sets error type in the error_status_table)
879  */
881 {
882  MpegEncContext *s = &ctx->m;
883  int mb_num;
884  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
885  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
886 
887  mb_num = mpeg4_decode_partition_a(ctx);
888  if (mb_num <= 0) {
890  s->mb_x, s->mb_y, part_a_error);
891  return -1;
892  }
893 
894  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
895  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
897  s->mb_x, s->mb_y, part_a_error);
898  return -1;
899  }
900 
901  s->mb_num_left = mb_num;
902 
903  if (s->pict_type == AV_PICTURE_TYPE_I) {
904  while (show_bits(&s->gb, 9) == 1)
905  skip_bits(&s->gb, 9);
906  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
908  "marker missing after first I partition at %d %d\n",
909  s->mb_x, s->mb_y);
910  return -1;
911  }
912  } else {
913  while (show_bits(&s->gb, 10) == 1)
914  skip_bits(&s->gb, 10);
915  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
917  "marker missing after first P partition at %d %d\n",
918  s->mb_x, s->mb_y);
919  return -1;
920  }
921  }
923  s->mb_x - 1, s->mb_y, part_a_end);
924 
925  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
926  if (s->pict_type == AV_PICTURE_TYPE_P)
928  s->mb_x, s->mb_y, ER_DC_ERROR);
929  return -1;
930  } else {
931  if (s->pict_type == AV_PICTURE_TYPE_P)
933  s->mb_x - 1, s->mb_y, ER_DC_END);
934  }
935 
936  return 0;
937 }
938 
939 /**
940  * Decode a block.
941  * @return <0 if an error occurred
942  */
943 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
944  int n, int coded, int intra, int rvlc)
945 {
946  MpegEncContext *s = &ctx->m;
947  int level, i, last, run, qmul, qadd;
948  int av_uninit(dc_pred_dir);
949  RLTable *rl;
950  RL_VLC_ELEM *rl_vlc;
951  const uint8_t *scan_table;
952 
953  // Note intra & rvlc should be optimized away if this is inlined
954 
955  if (intra) {
956  if (ctx->use_intra_dc_vlc) {
957  /* DC coef */
958  if (s->partitioned_frame) {
959  level = s->dc_val[0][s->block_index[n]];
960  if (n < 4)
961  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
962  else
963  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
964  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
965  } else {
966  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
967  if (level < 0)
968  return -1;
969  }
970  block[0] = level;
971  i = 0;
972  } else {
973  i = -1;
974  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
975  }
976  if (!coded)
977  goto not_coded;
978 
979  if (rvlc) {
980  rl = &ff_rvlc_rl_intra;
981  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
982  } else {
983  rl = &ff_mpeg4_rl_intra;
984  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
985  }
986  if (s->ac_pred) {
987  if (dc_pred_dir == 0)
988  scan_table = s->intra_v_scantable.permutated; /* left */
989  else
990  scan_table = s->intra_h_scantable.permutated; /* top */
991  } else {
992  scan_table = s->intra_scantable.permutated;
993  }
994  qmul = 1;
995  qadd = 0;
996  } else {
997  i = -1;
998  if (!coded) {
999  s->block_last_index[n] = i;
1000  return 0;
1001  }
1002  if (rvlc)
1003  rl = &ff_rvlc_rl_inter;
1004  else
1005  rl = &ff_h263_rl_inter;
1006 
1007  scan_table = s->intra_scantable.permutated;
1008 
1009  if (s->mpeg_quant) {
1010  qmul = 1;
1011  qadd = 0;
1012  if (rvlc)
1013  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1014  else
1015  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1016  } else {
1017  qmul = s->qscale << 1;
1018  qadd = (s->qscale - 1) | 1;
1019  if (rvlc)
1020  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1021  else
1022  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1023  }
1024  }
1025  {
1026  OPEN_READER(re, &s->gb);
1027  for (;;) {
1028  UPDATE_CACHE(re, &s->gb);
1029  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1030  if (level == 0) {
1031  /* escape */
1032  if (rvlc) {
1033  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1035  "1. marker bit missing in rvlc esc\n");
1036  return -1;
1037  }
1038  SKIP_CACHE(re, &s->gb, 1);
1039 
1040  last = SHOW_UBITS(re, &s->gb, 1);
1041  SKIP_CACHE(re, &s->gb, 1);
1042  run = SHOW_UBITS(re, &s->gb, 6);
1043  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1044  UPDATE_CACHE(re, &s->gb);
1045 
1046  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1048  "2. marker bit missing in rvlc esc\n");
1049  return -1;
1050  }
1051  SKIP_CACHE(re, &s->gb, 1);
1052 
1053  level = SHOW_UBITS(re, &s->gb, 11);
1054  SKIP_CACHE(re, &s->gb, 11);
1055 
1056  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1057  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1058  return -1;
1059  }
1060  SKIP_CACHE(re, &s->gb, 5);
1061 
1062  level = level * qmul + qadd;
1063  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1064  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1065 
1066  i += run + 1;
1067  if (last)
1068  i += 192;
1069  } else {
1070  int cache;
1071  cache = GET_CACHE(re, &s->gb);
1072 
1073  if (IS_3IV1)
1074  cache ^= 0xC0000000;
1075 
1076  if (cache & 0x80000000) {
1077  if (cache & 0x40000000) {
1078  /* third escape */
1079  SKIP_CACHE(re, &s->gb, 2);
1080  last = SHOW_UBITS(re, &s->gb, 1);
1081  SKIP_CACHE(re, &s->gb, 1);
1082  run = SHOW_UBITS(re, &s->gb, 6);
1083  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1084  UPDATE_CACHE(re, &s->gb);
1085 
1086  if (IS_3IV1) {
1087  level = SHOW_SBITS(re, &s->gb, 12);
1088  LAST_SKIP_BITS(re, &s->gb, 12);
1089  } else {
1090  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1092  "1. marker bit missing in 3. esc\n");
1093  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1094  return -1;
1095  }
1096  SKIP_CACHE(re, &s->gb, 1);
1097 
1098  level = SHOW_SBITS(re, &s->gb, 12);
1099  SKIP_CACHE(re, &s->gb, 12);
1100 
1101  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1103  "2. marker bit missing in 3. esc\n");
1104  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1105  return -1;
1106  }
1107 
1108  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1109  }
1110 
1111 #if 0
1112  if (s->error_recognition >= FF_ER_COMPLIANT) {
1113  const int abs_level= FFABS(level);
1114  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1115  const int run1= run - rl->max_run[last][abs_level] - 1;
1116  if (abs_level <= rl->max_level[last][run]) {
1117  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1118  return -1;
1119  }
1120  if (s->error_recognition > FF_ER_COMPLIANT) {
1121  if (abs_level <= rl->max_level[last][run]*2) {
1122  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1123  return -1;
1124  }
1125  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1126  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1127  return -1;
1128  }
1129  }
1130  }
1131  }
1132 #endif
1133  if (level > 0)
1134  level = level * qmul + qadd;
1135  else
1136  level = level * qmul - qadd;
1137 
1138  if ((unsigned)(level + 2048) > 4095) {
1140  if (level > 2560 || level < -2560) {
1142  "|level| overflow in 3. esc, qp=%d\n",
1143  s->qscale);
1144  return -1;
1145  }
1146  }
1147  level = level < 0 ? -2048 : 2047;
1148  }
1149 
1150  i += run + 1;
1151  if (last)
1152  i += 192;
1153  } else {
1154  /* second escape */
1155  SKIP_BITS(re, &s->gb, 2);
1156  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1157  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1158  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1159  LAST_SKIP_BITS(re, &s->gb, 1);
1160  }
1161  } else {
1162  /* first escape */
1163  SKIP_BITS(re, &s->gb, 1);
1164  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1165  i += run;
1166  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1167  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1168  LAST_SKIP_BITS(re, &s->gb, 1);
1169  }
1170  }
1171  } else {
1172  i += run;
1173  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1174  LAST_SKIP_BITS(re, &s->gb, 1);
1175  }
1176  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1177  if (i > 62) {
1178  i -= 192;
1179  if (i & (~63)) {
1181  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1182  return -1;
1183  }
1184 
1185  block[scan_table[i]] = level;
1186  break;
1187  }
1188 
1189  block[scan_table[i]] = level;
1190  }
1191  CLOSE_READER(re, &s->gb);
1192  }
1193 
1194 not_coded:
1195  if (intra) {
1196  if (!ctx->use_intra_dc_vlc) {
1197  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1198 
1199  i -= i >> 31; // if (i == -1) i = 0;
1200  }
1201 
1202  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1203  if (s->ac_pred)
1204  i = 63; // FIXME not optimal
1205  }
1206  s->block_last_index[n] = i;
1207  return 0;
1208 }
1209 
1210 /**
1211  * decode partition C of one MB.
1212  * @return <0 if an error occurred
1213  */
1215 {
1217  int cbp, mb_type;
1218  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1219 
1220  mb_type = s->current_picture.mb_type[xy];
1221  cbp = s->cbp_table[xy];
1222 
1223  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1224 
1225  if (s->current_picture.qscale_table[xy] != s->qscale)
1227 
1228  if (s->pict_type == AV_PICTURE_TYPE_P ||
1229  s->pict_type == AV_PICTURE_TYPE_S) {
1230  int i;
1231  for (i = 0; i < 4; i++) {
1232  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1233  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1234  }
1235  s->mb_intra = IS_INTRA(mb_type);
1236 
1237  if (IS_SKIP(mb_type)) {
1238  /* skip mb */
1239  for (i = 0; i < 6; i++)
1240  s->block_last_index[i] = -1;
1241  s->mv_dir = MV_DIR_FORWARD;
1242  s->mv_type = MV_TYPE_16X16;
1244  && ctx->vol_sprite_usage == GMC_SPRITE) {
1245  s->mcsel = 1;
1246  s->mb_skipped = 0;
1247  } else {
1248  s->mcsel = 0;
1249  s->mb_skipped = 1;
1250  }
1251  } else if (s->mb_intra) {
1253  } else if (!s->mb_intra) {
1254  // s->mcsel = 0; // FIXME do we need to init that?
1255 
1256  s->mv_dir = MV_DIR_FORWARD;
1257  if (IS_8X8(mb_type)) {
1258  s->mv_type = MV_TYPE_8X8;
1259  } else {
1260  s->mv_type = MV_TYPE_16X16;
1261  }
1262  }
1263  } else { /* I-Frame */
1264  s->mb_intra = 1;
1266  }
1267 
1268  if (!IS_SKIP(mb_type)) {
1269  int i;
1270  s->bdsp.clear_blocks(s->block[0]);
1271  /* decode each block */
1272  for (i = 0; i < 6; i++) {
1273  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1275  "texture corrupted at %d %d %d\n",
1276  s->mb_x, s->mb_y, s->mb_intra);
1277  return -1;
1278  }
1279  cbp += cbp;
1280  }
1281  }
1282 
1283  /* per-MB end of slice check */
1284  if (--s->mb_num_left <= 0) {
1285  if (mpeg4_is_resync(ctx))
1286  return SLICE_END;
1287  else
1288  return SLICE_NOEND;
1289  } else {
1290  if (mpeg4_is_resync(ctx)) {
1291  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1292  if (s->cbp_table[xy + delta])
1293  return SLICE_END;
1294  }
1295  return SLICE_OK;
1296  }
1297 }
1298 
1299 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1300 {
1302  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1303  int16_t *mot_val;
1304  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1305  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1306 
1307  av_assert2(s->h263_pred);
1308 
1309  if (s->pict_type == AV_PICTURE_TYPE_P ||
1310  s->pict_type == AV_PICTURE_TYPE_S) {
1311  do {
1312  if (get_bits1(&s->gb)) {
1313  /* skip mb */
1314  s->mb_intra = 0;
1315  for (i = 0; i < 6; i++)
1316  s->block_last_index[i] = -1;
1317  s->mv_dir = MV_DIR_FORWARD;
1318  s->mv_type = MV_TYPE_16X16;
1319  if (s->pict_type == AV_PICTURE_TYPE_S &&
1320  ctx->vol_sprite_usage == GMC_SPRITE) {
1322  MB_TYPE_GMC |
1323  MB_TYPE_16x16 |
1324  MB_TYPE_L0;
1325  s->mcsel = 1;
1326  s->mv[0][0][0] = get_amv(ctx, 0);
1327  s->mv[0][0][1] = get_amv(ctx, 1);
1328  s->mb_skipped = 0;
1329  } else {
1331  MB_TYPE_16x16 |
1332  MB_TYPE_L0;
1333  s->mcsel = 0;
1334  s->mv[0][0][0] = 0;
1335  s->mv[0][0][1] = 0;
1336  s->mb_skipped = 1;
1337  }
1338  goto end;
1339  }
1341  if (cbpc < 0) {
1343  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1344  return -1;
1345  }
1346  } while (cbpc == 20);
1347 
1348  s->bdsp.clear_blocks(s->block[0]);
1349  dquant = cbpc & 8;
1350  s->mb_intra = ((cbpc & 4) != 0);
1351  if (s->mb_intra)
1352  goto intra;
1353 
1354  if (s->pict_type == AV_PICTURE_TYPE_S &&
1355  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1356  s->mcsel = get_bits1(&s->gb);
1357  else
1358  s->mcsel = 0;
1359  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1360  if (cbpy < 0) {
1362  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1363  return AVERROR_INVALIDDATA;
1364  }
1365 
1366  cbp = (cbpc & 3) | (cbpy << 2);
1367  if (dquant)
1368  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1369  if ((!s->progressive_sequence) &&
1370  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1371  s->interlaced_dct = get_bits1(&s->gb);
1372 
1373  s->mv_dir = MV_DIR_FORWARD;
1374  if ((cbpc & 16) == 0) {
1375  if (s->mcsel) {
1377  MB_TYPE_16x16 |
1378  MB_TYPE_L0;
1379  /* 16x16 global motion prediction */
1380  s->mv_type = MV_TYPE_16X16;
1381  mx = get_amv(ctx, 0);
1382  my = get_amv(ctx, 1);
1383  s->mv[0][0][0] = mx;
1384  s->mv[0][0][1] = my;
1385  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1387  MB_TYPE_L0 |
1389  /* 16x8 field motion prediction */
1390  s->mv_type = MV_TYPE_FIELD;
1391 
1392  s->field_select[0][0] = get_bits1(&s->gb);
1393  s->field_select[0][1] = get_bits1(&s->gb);
1394 
1395  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1396 
1397  for (i = 0; i < 2; i++) {
1398  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1399  if (mx >= 0xffff)
1400  return -1;
1401 
1402  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1403  if (my >= 0xffff)
1404  return -1;
1405 
1406  s->mv[0][i][0] = mx;
1407  s->mv[0][i][1] = my;
1408  }
1409  } else {
1411  /* 16x16 motion prediction */
1412  s->mv_type = MV_TYPE_16X16;
1413  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1414  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1415 
1416  if (mx >= 0xffff)
1417  return -1;
1418 
1419  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1420 
1421  if (my >= 0xffff)
1422  return -1;
1423  s->mv[0][0][0] = mx;
1424  s->mv[0][0][1] = my;
1425  }
1426  } else {
1428  s->mv_type = MV_TYPE_8X8;
1429  for (i = 0; i < 4; i++) {
1430  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1431  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1432  if (mx >= 0xffff)
1433  return -1;
1434 
1435  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1436  if (my >= 0xffff)
1437  return -1;
1438  s->mv[0][i][0] = mx;
1439  s->mv[0][i][1] = my;
1440  mot_val[0] = mx;
1441  mot_val[1] = my;
1442  }
1443  }
1444  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1445  int modb1; // first bit of modb
1446  int modb2; // second bit of modb
1447  int mb_type;
1448 
1449  s->mb_intra = 0; // B-frames never contain intra blocks
1450  s->mcsel = 0; // ... true gmc blocks
1451 
1452  if (s->mb_x == 0) {
1453  for (i = 0; i < 2; i++) {
1454  s->last_mv[i][0][0] =
1455  s->last_mv[i][0][1] =
1456  s->last_mv[i][1][0] =
1457  s->last_mv[i][1][1] = 0;
1458  }
1459 
1461  }
1462 
1463  /* if we skipped it in the future P-frame than skip it now too */
1464  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1465 
1466  if (s->mb_skipped) {
1467  /* skip mb */
1468  for (i = 0; i < 6; i++)
1469  s->block_last_index[i] = -1;
1470 
1471  s->mv_dir = MV_DIR_FORWARD;
1472  s->mv_type = MV_TYPE_16X16;
1473  s->mv[0][0][0] =
1474  s->mv[0][0][1] =
1475  s->mv[1][0][0] =
1476  s->mv[1][0][1] = 0;
1478  MB_TYPE_16x16 |
1479  MB_TYPE_L0;
1480  goto end;
1481  }
1482 
1483  modb1 = get_bits1(&s->gb);
1484  if (modb1) {
1485  // like MB_TYPE_B_DIRECT but no vectors coded
1487  cbp = 0;
1488  } else {
1489  modb2 = get_bits1(&s->gb);
1490  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1491  if (mb_type < 0) {
1492  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1493  return -1;
1494  }
1495  mb_type = mb_type_b_map[mb_type];
1496  if (modb2) {
1497  cbp = 0;
1498  } else {
1499  s->bdsp.clear_blocks(s->block[0]);
1500  cbp = get_bits(&s->gb, 6);
1501  }
1502 
1503  if ((!IS_DIRECT(mb_type)) && cbp) {
1504  if (get_bits1(&s->gb))
1505  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1506  }
1507 
1508  if (!s->progressive_sequence) {
1509  if (cbp)
1510  s->interlaced_dct = get_bits1(&s->gb);
1511 
1512  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1513  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1514  mb_type &= ~MB_TYPE_16x16;
1515 
1516  if (USES_LIST(mb_type, 0)) {
1517  s->field_select[0][0] = get_bits1(&s->gb);
1518  s->field_select[0][1] = get_bits1(&s->gb);
1519  }
1520  if (USES_LIST(mb_type, 1)) {
1521  s->field_select[1][0] = get_bits1(&s->gb);
1522  s->field_select[1][1] = get_bits1(&s->gb);
1523  }
1524  }
1525  }
1526 
1527  s->mv_dir = 0;
1528  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1529  s->mv_type = MV_TYPE_16X16;
1530 
1531  if (USES_LIST(mb_type, 0)) {
1532  s->mv_dir = MV_DIR_FORWARD;
1533 
1534  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1535  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1536  s->last_mv[0][1][0] =
1537  s->last_mv[0][0][0] =
1538  s->mv[0][0][0] = mx;
1539  s->last_mv[0][1][1] =
1540  s->last_mv[0][0][1] =
1541  s->mv[0][0][1] = my;
1542  }
1543 
1544  if (USES_LIST(mb_type, 1)) {
1545  s->mv_dir |= MV_DIR_BACKWARD;
1546 
1547  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1548  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1549  s->last_mv[1][1][0] =
1550  s->last_mv[1][0][0] =
1551  s->mv[1][0][0] = mx;
1552  s->last_mv[1][1][1] =
1553  s->last_mv[1][0][1] =
1554  s->mv[1][0][1] = my;
1555  }
1556  } else if (!IS_DIRECT(mb_type)) {
1557  s->mv_type = MV_TYPE_FIELD;
1558 
1559  if (USES_LIST(mb_type, 0)) {
1560  s->mv_dir = MV_DIR_FORWARD;
1561 
1562  for (i = 0; i < 2; i++) {
1563  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1564  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1565  s->last_mv[0][i][0] =
1566  s->mv[0][i][0] = mx;
1567  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1568  }
1569  }
1570 
1571  if (USES_LIST(mb_type, 1)) {
1572  s->mv_dir |= MV_DIR_BACKWARD;
1573 
1574  for (i = 0; i < 2; i++) {
1575  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1576  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1577  s->last_mv[1][i][0] =
1578  s->mv[1][i][0] = mx;
1579  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1580  }
1581  }
1582  }
1583  }
1584 
1585  if (IS_DIRECT(mb_type)) {
1586  if (IS_SKIP(mb_type)) {
1587  mx =
1588  my = 0;
1589  } else {
1590  mx = ff_h263_decode_motion(s, 0, 1);
1591  my = ff_h263_decode_motion(s, 0, 1);
1592  }
1593 
1595  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1596  }
1597  s->current_picture.mb_type[xy] = mb_type;
1598  } else { /* I-Frame */
1599  do {
1601  if (cbpc < 0) {
1603  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1604  return -1;
1605  }
1606  } while (cbpc == 8);
1607 
1608  dquant = cbpc & 4;
1609  s->mb_intra = 1;
1610 
1611 intra:
1612  s->ac_pred = get_bits1(&s->gb);
1613  if (s->ac_pred)
1615  else
1617 
1618  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1619  if (cbpy < 0) {
1621  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1622  return -1;
1623  }
1624  cbp = (cbpc & 3) | (cbpy << 2);
1625 
1626  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1627 
1628  if (dquant)
1629  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1630 
1631  if (!s->progressive_sequence)
1632  s->interlaced_dct = get_bits1(&s->gb);
1633 
1634  s->bdsp.clear_blocks(s->block[0]);
1635  /* decode each block */
1636  for (i = 0; i < 6; i++) {
1637  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1638  return -1;
1639  cbp += cbp;
1640  }
1641  goto end;
1642  }
1643 
1644  /* decode each block */
1645  for (i = 0; i < 6; i++) {
1646  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1647  return -1;
1648  cbp += cbp;
1649  }
1650 
1651 end:
1652  /* per-MB end of slice check */
1653  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1654  int next = mpeg4_is_resync(ctx);
1655  if (next) {
1656  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1657  return -1;
1658  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1659  return SLICE_END;
1660 
1661  if (s->pict_type == AV_PICTURE_TYPE_B) {
1662  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1664  (s->mb_x + delta >= s->mb_width)
1665  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1666  : s->mb_y, 0);
1667  if (s->next_picture.mbskip_table[xy + delta])
1668  return SLICE_OK;
1669  }
1670 
1671  return SLICE_END;
1672  }
1673  }
1674 
1675  return SLICE_OK;
1676 }
1677 
1679 {
1680  int hours, minutes, seconds;
1681 
1682  if (!show_bits(gb, 23)) {
1683  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1684  return -1;
1685  }
1686 
1687  hours = get_bits(gb, 5);
1688  minutes = get_bits(gb, 6);
1689  check_marker(s->avctx, gb, "in gop_header");
1690  seconds = get_bits(gb, 6);
1691 
1692  s->time_base = seconds + 60*(minutes + 60*hours);
1693 
1694  skip_bits1(gb);
1695  skip_bits1(gb);
1696 
1697  return 0;
1698 }
1699 
1701 {
1702 
1703  s->avctx->profile = get_bits(gb, 4);
1704  s->avctx->level = get_bits(gb, 4);
1705 
1706  // for Simple profile, level 0
1707  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1708  s->avctx->level = 0;
1709  }
1710 
1711  return 0;
1712 }
1713 
1715 {
1716  MpegEncContext *s = &ctx->m;
1717  int width, height, vo_ver_id;
1718 
1719  /* vol header */
1720  skip_bits(gb, 1); /* random access */
1721  s->vo_type = get_bits(gb, 8);
1722  if (get_bits1(gb) != 0) { /* is_ol_id */
1723  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1724  skip_bits(gb, 3); /* vo_priority */
1725  } else {
1726  vo_ver_id = 1;
1727  }
1728  s->aspect_ratio_info = get_bits(gb, 4);
1730  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1731  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1732  } else {
1734  }
1735 
1736  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1737  int chroma_format = get_bits(gb, 2);
1738  if (chroma_format != CHROMA_420)
1739  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1740 
1741  s->low_delay = get_bits1(gb);
1742  if (get_bits1(gb)) { /* vbv parameters */
1743  get_bits(gb, 15); /* first_half_bitrate */
1744  check_marker(s->avctx, gb, "after first_half_bitrate");
1745  get_bits(gb, 15); /* latter_half_bitrate */
1746  check_marker(s->avctx, gb, "after latter_half_bitrate");
1747  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1748  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1749  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1750  get_bits(gb, 11); /* first_half_vbv_occupancy */
1751  check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1752  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1753  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1754  }
1755  } else {
1756  /* is setting low delay flag only once the smartest thing to do?
1757  * low delay detection will not be overridden. */
1758  if (s->picture_number == 0) {
1759  switch(s->vo_type) {
1760  case SIMPLE_VO_TYPE:
1761  case ADV_SIMPLE_VO_TYPE:
1762  s->low_delay = 1;
1763  break;
1764  default:
1765  s->low_delay = 0;
1766  }
1767  }
1768  }
1769 
1770  ctx->shape = get_bits(gb, 2); /* vol shape */
1771  if (ctx->shape != RECT_SHAPE)
1772  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1773  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1774  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1775  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1776  }
1777 
1778  check_marker(s->avctx, gb, "before time_increment_resolution");
1779 
1780  s->avctx->framerate.num = get_bits(gb, 16);
1781  if (!s->avctx->framerate.num) {
1782  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1783  return AVERROR_INVALIDDATA;
1784  }
1785 
1786  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1787  if (ctx->time_increment_bits < 1)
1788  ctx->time_increment_bits = 1;
1789 
1790  check_marker(s->avctx, gb, "before fixed_vop_rate");
1791 
1792  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1794  else
1795  s->avctx->framerate.den = 1;
1796 
1798 
1799  ctx->t_frame = 0;
1800 
1801  if (ctx->shape != BIN_ONLY_SHAPE) {
1802  if (ctx->shape == RECT_SHAPE) {
1803  check_marker(s->avctx, gb, "before width");
1804  width = get_bits(gb, 13);
1805  check_marker(s->avctx, gb, "before height");
1806  height = get_bits(gb, 13);
1807  check_marker(s->avctx, gb, "after height");
1808  if (width && height && /* they should be non zero but who knows */
1809  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1810  if (s->width && s->height &&
1811  (s->width != width || s->height != height))
1812  s->context_reinit = 1;
1813  s->width = width;
1814  s->height = height;
1815  }
1816  }
1817 
1818  s->progressive_sequence =
1819  s->progressive_frame = get_bits1(gb) ^ 1;
1820  s->interlaced_dct = 0;
1821  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1822  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1823  "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1824  if (vo_ver_id == 1)
1825  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1826  else
1827  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1828 
1829  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1830  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1831  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1832  ctx->vol_sprite_usage == GMC_SPRITE) {
1833  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1834  skip_bits(gb, 13); // sprite_width
1835  check_marker(s->avctx, gb, "after sprite_width");
1836  skip_bits(gb, 13); // sprite_height
1837  check_marker(s->avctx, gb, "after sprite_height");
1838  skip_bits(gb, 13); // sprite_left
1839  check_marker(s->avctx, gb, "after sprite_left");
1840  skip_bits(gb, 13); // sprite_top
1841  check_marker(s->avctx, gb, "after sprite_top");
1842  }
1843  ctx->num_sprite_warping_points = get_bits(gb, 6);
1844  if (ctx->num_sprite_warping_points > 3) {
1845  av_log(s->avctx, AV_LOG_ERROR,
1846  "%d sprite_warping_points\n",
1847  ctx->num_sprite_warping_points);
1848  ctx->num_sprite_warping_points = 0;
1849  return AVERROR_INVALIDDATA;
1850  }
1851  s->sprite_warping_accuracy = get_bits(gb, 2);
1852  ctx->sprite_brightness_change = get_bits1(gb);
1853  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1854  skip_bits1(gb); // low_latency_sprite
1855  }
1856  // FIXME sadct disable bit if verid!=1 && shape not rect
1857 
1858  if (get_bits1(gb) == 1) { /* not_8_bit */
1859  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1860  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1861  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1862  if (s->quant_precision != 5)
1863  av_log(s->avctx, AV_LOG_ERROR,
1864  "quant precision %d\n", s->quant_precision);
1865  if (s->quant_precision<3 || s->quant_precision>9) {
1866  s->quant_precision = 5;
1867  }
1868  } else {
1869  s->quant_precision = 5;
1870  }
1871 
1872  // FIXME a bunch of grayscale shape things
1873 
1874  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1875  int i, v;
1876 
1877  /* load default matrixes */
1878  for (i = 0; i < 64; i++) {
1879  int j = s->idsp.idct_permutation[i];
1881  s->intra_matrix[j] = v;
1882  s->chroma_intra_matrix[j] = v;
1883 
1885  s->inter_matrix[j] = v;
1886  s->chroma_inter_matrix[j] = v;
1887  }
1888 
1889  /* load custom intra matrix */
1890  if (get_bits1(gb)) {
1891  int last = 0;
1892  for (i = 0; i < 64; i++) {
1893  int j;
1894  if (get_bits_left(gb) < 8) {
1895  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1896  return AVERROR_INVALIDDATA;
1897  }
1898  v = get_bits(gb, 8);
1899  if (v == 0)
1900  break;
1901 
1902  last = v;
1903  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1904  s->intra_matrix[j] = last;
1905  s->chroma_intra_matrix[j] = last;
1906  }
1907 
1908  /* replicate last value */
1909  for (; i < 64; i++) {
1910  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1911  s->intra_matrix[j] = last;
1912  s->chroma_intra_matrix[j] = last;
1913  }
1914  }
1915 
1916  /* load custom non intra matrix */
1917  if (get_bits1(gb)) {
1918  int last = 0;
1919  for (i = 0; i < 64; i++) {
1920  int j;
1921  if (get_bits_left(gb) < 8) {
1922  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1923  return AVERROR_INVALIDDATA;
1924  }
1925  v = get_bits(gb, 8);
1926  if (v == 0)
1927  break;
1928 
1929  last = v;
1930  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1931  s->inter_matrix[j] = v;
1932  s->chroma_inter_matrix[j] = v;
1933  }
1934 
1935  /* replicate last value */
1936  for (; i < 64; i++) {
1937  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1938  s->inter_matrix[j] = last;
1939  s->chroma_inter_matrix[j] = last;
1940  }
1941  }
1942 
1943  // FIXME a bunch of grayscale shape things
1944  }
1945 
1946  if (vo_ver_id != 1)
1947  s->quarter_sample = get_bits1(gb);
1948  else
1949  s->quarter_sample = 0;
1950 
1951  if (get_bits_left(gb) < 4) {
1952  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1953  return AVERROR_INVALIDDATA;
1954  }
1955 
1956  if (!get_bits1(gb)) {
1957  int pos = get_bits_count(gb);
1958  int estimation_method = get_bits(gb, 2);
1959  if (estimation_method < 2) {
1960  if (!get_bits1(gb)) {
1961  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1962  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1963  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1964  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1965  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1966  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
1967  }
1968  if (!get_bits1(gb)) {
1969  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1970  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1971  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1972  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1973  }
1974  if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
1975  skip_bits_long(gb, pos - get_bits_count(gb));
1976  goto no_cplx_est;
1977  }
1978  if (!get_bits1(gb)) {
1979  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1980  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1981  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1982  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1983  }
1984  if (!get_bits1(gb)) {
1985  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1986  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1987  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1988  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1989  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1990  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1991  }
1992  if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
1993  skip_bits_long(gb, pos - get_bits_count(gb));
1994  goto no_cplx_est;
1995  }
1996  if (estimation_method == 1) {
1997  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1998  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1999  }
2000  } else
2001  av_log(s->avctx, AV_LOG_ERROR,
2002  "Invalid Complexity estimation method %d\n",
2003  estimation_method);
2004  } else {
2005 
2006 no_cplx_est:
2007  ctx->cplx_estimation_trash_i =
2008  ctx->cplx_estimation_trash_p =
2009  ctx->cplx_estimation_trash_b = 0;
2010  }
2011 
2012  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2013 
2014  s->data_partitioning = get_bits1(gb);
2015  if (s->data_partitioning)
2016  ctx->rvlc = get_bits1(gb);
2017 
2018  if (vo_ver_id != 1) {
2019  ctx->new_pred = get_bits1(gb);
2020  if (ctx->new_pred) {
2021  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2022  skip_bits(gb, 2); /* requested upstream message type */
2023  skip_bits1(gb); /* newpred segment type */
2024  }
2025  if (get_bits1(gb)) // reduced_res_vop
2026  av_log(s->avctx, AV_LOG_ERROR,
2027  "reduced resolution VOP not supported\n");
2028  } else {
2029  ctx->new_pred = 0;
2030  }
2031 
2032  ctx->scalability = get_bits1(gb);
2033 
2034  if (ctx->scalability) {
2035  GetBitContext bak = *gb;
2036  int h_sampling_factor_n;
2037  int h_sampling_factor_m;
2038  int v_sampling_factor_n;
2039  int v_sampling_factor_m;
2040 
2041  skip_bits1(gb); // hierarchy_type
2042  skip_bits(gb, 4); /* ref_layer_id */
2043  skip_bits1(gb); /* ref_layer_sampling_dir */
2044  h_sampling_factor_n = get_bits(gb, 5);
2045  h_sampling_factor_m = get_bits(gb, 5);
2046  v_sampling_factor_n = get_bits(gb, 5);
2047  v_sampling_factor_m = get_bits(gb, 5);
2048  ctx->enhancement_type = get_bits1(gb);
2049 
2050  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2051  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2052  /* illegal scalability header (VERY broken encoder),
2053  * trying to workaround */
2054  ctx->scalability = 0;
2055  *gb = bak;
2056  } else
2057  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2058 
2059  // bin shape stuff FIXME
2060  }
2061  }
2062 
2063  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2064  av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d %s%s%s%s\n",
2065  s->avctx->framerate.den, s->avctx->framerate.num,
2066  ctx->time_increment_bits,
2067  s->quant_precision,
2068  s->progressive_sequence,
2069  s->low_delay,
2070  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2071  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2072  );
2073  }
2074 
2075  return 0;
2076 }
2077 
2078 /**
2079  * Decode the user data stuff in the header.
2080  * Also initializes divx/xvid/lavc_version/build.
2081  */
2083 {
2084  MpegEncContext *s = &ctx->m;
2085  char buf[256];
2086  int i;
2087  int e;
2088  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2089  char last;
2090 
2091  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2092  if (show_bits(gb, 23) == 0)
2093  break;
2094  buf[i] = get_bits(gb, 8);
2095  }
2096  buf[i] = 0;
2097 
2098  /* divx detection */
2099  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2100  if (e < 2)
2101  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2102  if (e >= 2) {
2103  ctx->divx_version = ver;
2104  ctx->divx_build = build;
2105  s->divx_packed = e == 3 && last == 'p';
2106  }
2107 
2108  /* libavcodec detection */
2109  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2110  if (e != 4)
2111  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2112  if (e != 4) {
2113  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2114  if (e > 1)
2115  build = (ver << 16) + (ver2 << 8) + ver3;
2116  }
2117  if (e != 4) {
2118  if (strcmp(buf, "ffmpeg") == 0)
2119  ctx->lavc_build = 4600;
2120  }
2121  if (e == 4)
2122  ctx->lavc_build = build;
2123 
2124  /* Xvid detection */
2125  e = sscanf(buf, "XviD%d", &build);
2126  if (e == 1)
2127  ctx->xvid_build = build;
2128 
2129  return 0;
2130 }
2131 
2133 {
2134  Mpeg4DecContext *ctx = avctx->priv_data;
2135  MpegEncContext *s = &ctx->m;
2136 
2137  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2138  if (s->codec_tag == AV_RL32("XVID") ||
2139  s->codec_tag == AV_RL32("XVIX") ||
2140  s->codec_tag == AV_RL32("RMP4") ||
2141  s->codec_tag == AV_RL32("ZMP4") ||
2142  s->codec_tag == AV_RL32("SIPP"))
2143  ctx->xvid_build = 0;
2144  }
2145 
2146  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2147  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2148  ctx->vol_control_parameters == 0)
2149  ctx->divx_version = 400; // divx 4
2150 
2151  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2152  ctx->divx_version =
2153  ctx->divx_build = -1;
2154  }
2155 
2157  if (s->codec_tag == AV_RL32("XVIX"))
2159 
2160  if (s->codec_tag == AV_RL32("UMP4"))
2162 
2163  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2165 
2166  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2168 
2169  if (ctx->xvid_build <= 3U)
2170  s->padding_bug_score = 256 * 256 * 256 * 64;
2171 
2172  if (ctx->xvid_build <= 1U)
2174 
2175  if (ctx->xvid_build <= 12U)
2177 
2178  if (ctx->xvid_build <= 32U)
2180 
2181 #define SET_QPEL_FUNC(postfix1, postfix2) \
2182  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2183  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2184  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2185 
2186  if (ctx->lavc_build < 4653U)
2188 
2189  if (ctx->lavc_build < 4655U)
2191 
2192  if (ctx->lavc_build < 4670U)
2194 
2195  if (ctx->lavc_build <= 4712U)
2197 
2198  if ((ctx->lavc_build&0xFF) >= 100) {
2199  if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2200  (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2201  )
2203  }
2204 
2205  if (ctx->divx_version >= 0)
2207  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2208  s->padding_bug_score = 256 * 256 * 256 * 64;
2209 
2210  if (ctx->divx_version < 500U)
2212 
2213  if (ctx->divx_version >= 0)
2215  }
2216 
2217  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2218  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2219  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2220  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2221  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2222  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2223  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2224 
2225  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2226  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2227  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2228  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2229  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2230  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2231  }
2232 
2233  if (avctx->debug & FF_DEBUG_BUGS)
2235  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2236  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2237  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2238 
2239  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2240  s->codec_id == AV_CODEC_ID_MPEG4 &&
2241  avctx->idct_algo == FF_IDCT_AUTO) {
2242  avctx->idct_algo = FF_IDCT_XVID;
2243  ff_mpv_idct_init(s);
2244  return 1;
2245  }
2246 
2247  return 0;
2248 }
2249 
2251 {
2252  MpegEncContext *s = &ctx->m;
2253  int time_incr, time_increment;
2254  int64_t pts;
2255 
2256  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2257  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2259  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2260  s->low_delay = 0;
2261  }
2262 
2264  if (s->partitioned_frame)
2266  else
2268 
2269  time_incr = 0;
2270  while (get_bits1(gb) != 0)
2271  time_incr++;
2272 
2273  check_marker(s->avctx, gb, "before time_increment");
2274 
2275  if (ctx->time_increment_bits == 0 ||
2276  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2278  "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);
2279 
2280  for (ctx->time_increment_bits = 1;
2281  ctx->time_increment_bits < 16;
2282  ctx->time_increment_bits++) {
2283  if (s->pict_type == AV_PICTURE_TYPE_P ||
2284  (s->pict_type == AV_PICTURE_TYPE_S &&
2285  ctx->vol_sprite_usage == GMC_SPRITE)) {
2286  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2287  break;
2288  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2289  break;
2290  }
2291 
2293  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2294  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2295  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2297  }
2298  }
2299 
2300  if (IS_3IV1)
2301  time_increment = get_bits1(gb); // FIXME investigate further
2302  else
2303  time_increment = get_bits(gb, ctx->time_increment_bits);
2304 
2305  if (s->pict_type != AV_PICTURE_TYPE_B) {
2306  s->last_time_base = s->time_base;
2307  s->time_base += time_incr;
2308  s->time = s->time_base * s->avctx->framerate.num + time_increment;
2309  if (s->workaround_bugs & FF_BUG_UMP4) {
2310  if (s->time < s->last_non_b_time) {
2311  /* header is not mpeg-4-compatible, broken encoder,
2312  * trying to workaround */
2313  s->time_base++;
2314  s->time += s->avctx->framerate.num;
2315  }
2316  }
2317  s->pp_time = s->time - s->last_non_b_time;
2318  s->last_non_b_time = s->time;
2319  } else {
2320  s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2321  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2322  if (s->pp_time <= s->pb_time ||
2323  s->pp_time <= s->pp_time - s->pb_time ||
2324  s->pp_time <= 0) {
2325  /* messed up order, maybe after seeking? skipping current B-frame */
2326  return FRAME_SKIPPED;
2327  }
2329 
2330  if (ctx->t_frame == 0)
2331  ctx->t_frame = s->pb_time;
2332  if (ctx->t_frame == 0)
2333  ctx->t_frame = 1; // 1/0 protection
2334  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2335  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2336  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2337  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2338  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2339  s->pb_field_time = 2;
2340  s->pp_field_time = 4;
2341  if (!s->progressive_sequence)
2342  return FRAME_SKIPPED;
2343  }
2344  }
2345 
2346  if (s->avctx->framerate.den)
2347  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2348  else
2349  pts = AV_NOPTS_VALUE;
2350  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2351 
2352  check_marker(s->avctx, gb, "before vop_coded");
2353 
2354  /* vop coded */
2355  if (get_bits1(gb) != 1) {
2356  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2357  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2358  return FRAME_SKIPPED;
2359  }
2360  if (ctx->new_pred)
2361  decode_new_pred(ctx, gb);
2362 
2363  if (ctx->shape != BIN_ONLY_SHAPE &&
2364  (s->pict_type == AV_PICTURE_TYPE_P ||
2365  (s->pict_type == AV_PICTURE_TYPE_S &&
2366  ctx->vol_sprite_usage == GMC_SPRITE))) {
2367  /* rounding type for motion estimation */
2368  s->no_rounding = get_bits1(gb);
2369  } else {
2370  s->no_rounding = 0;
2371  }
2372  // FIXME reduced res stuff
2373 
2374  if (ctx->shape != RECT_SHAPE) {
2375  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2376  skip_bits(gb, 13); /* width */
2377  check_marker(s->avctx, gb, "after width");
2378  skip_bits(gb, 13); /* height */
2379  check_marker(s->avctx, gb, "after height");
2380  skip_bits(gb, 13); /* hor_spat_ref */
2381  check_marker(s->avctx, gb, "after hor_spat_ref");
2382  skip_bits(gb, 13); /* ver_spat_ref */
2383  }
2384  skip_bits1(gb); /* change_CR_disable */
2385 
2386  if (get_bits1(gb) != 0)
2387  skip_bits(gb, 8); /* constant_alpha_value */
2388  }
2389 
2390  // FIXME complexity estimation stuff
2391 
2392  if (ctx->shape != BIN_ONLY_SHAPE) {
2393  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2394  if (s->pict_type != AV_PICTURE_TYPE_I)
2395  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2396  if (s->pict_type == AV_PICTURE_TYPE_B)
2397  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2398 
2399  if (get_bits_left(gb) < 3) {
2400  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2401  return AVERROR_INVALIDDATA;
2402  }
2403  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2404  if (!s->progressive_sequence) {
2405  s->top_field_first = get_bits1(gb);
2406  s->alternate_scan = get_bits1(gb);
2407  } else
2408  s->alternate_scan = 0;
2409  }
2410 
2411  if (s->alternate_scan) {
2412  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2413  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2414  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2415  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2416  } else {
2417  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2418  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2419  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2420  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2421  }
2422 
2423  if (s->pict_type == AV_PICTURE_TYPE_S &&
2424  (ctx->vol_sprite_usage == STATIC_SPRITE ||
2425  ctx->vol_sprite_usage == GMC_SPRITE)) {
2426  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2427  return AVERROR_INVALIDDATA;
2428  if (ctx->sprite_brightness_change)
2429  av_log(s->avctx, AV_LOG_ERROR,
2430  "sprite_brightness_change not supported\n");
2431  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2432  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2433  }
2434 
2435  if (ctx->shape != BIN_ONLY_SHAPE) {
2436  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2437  if (s->qscale == 0) {
2438  av_log(s->avctx, AV_LOG_ERROR,
2439  "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2440  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2441  }
2442 
2443  if (s->pict_type != AV_PICTURE_TYPE_I) {
2444  s->f_code = get_bits(gb, 3); /* fcode_for */
2445  if (s->f_code == 0) {
2446  av_log(s->avctx, AV_LOG_ERROR,
2447  "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2448  s->f_code = 1;
2449  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2450  }
2451  } else
2452  s->f_code = 1;
2453 
2454  if (s->pict_type == AV_PICTURE_TYPE_B) {
2455  s->b_code = get_bits(gb, 3);
2456  if (s->b_code == 0) {
2457  av_log(s->avctx, AV_LOG_ERROR,
2458  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2459  s->b_code=1;
2460  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2461  }
2462  } else
2463  s->b_code = 1;
2464 
2465  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2466  av_log(s->avctx, AV_LOG_DEBUG,
2467  "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",
2468  s->qscale, s->f_code, s->b_code,
2469  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")),
2470  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2471  s->top_field_first, s->quarter_sample ? "q" : "h",
2472  s->data_partitioning, ctx->resync_marker,
2473  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2474  1 - s->no_rounding, s->vo_type,
2475  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2476  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2477  ctx->cplx_estimation_trash_b,
2478  s->time,
2479  time_increment
2480  );
2481  }
2482 
2483  if (!ctx->scalability) {
2484  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2485  skip_bits1(gb); // vop shape coding type
2486  } else {
2487  if (ctx->enhancement_type) {
2488  int load_backward_shape = get_bits1(gb);
2489  if (load_backward_shape)
2490  av_log(s->avctx, AV_LOG_ERROR,
2491  "load backward shape isn't supported\n");
2492  }
2493  skip_bits(gb, 2); // ref_select_code
2494  }
2495  }
2496  /* detect buggy encoders which don't set the low_delay flag
2497  * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2498  * easily (although it's buggy too) */
2499  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2500  ctx->divx_version == -1 && s->picture_number == 0) {
2501  av_log(s->avctx, AV_LOG_WARNING,
2502  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2503  s->low_delay = 1;
2504  }
2505 
2506  s->picture_number++; // better than pic number==0 always ;)
2507 
2508  // FIXME add short header support
2509  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2510  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2511 
2512  if (s->workaround_bugs & FF_BUG_EDGE) {
2513  s->h_edge_pos = s->width;
2514  s->v_edge_pos = s->height;
2515  }
2516  return 0;
2517 }
2518 
2519 /**
2520  * Decode MPEG-4 headers.
2521  * @return <0 if no VOP found (or a damaged one)
2522  * FRAME_SKIPPED if a not coded VOP is found
2523  * 0 if a VOP is found
2524  */
2526 {
2527  MpegEncContext *s = &ctx->m;
2528  unsigned startcode, v;
2529  int ret;
2530 
2531  /* search next start code */
2532  align_get_bits(gb);
2533 
2534  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2535  skip_bits(gb, 24);
2536  if (get_bits(gb, 8) == 0xF0)
2537  goto end;
2538  }
2539 
2540  startcode = 0xff;
2541  for (;;) {
2542  if (get_bits_count(gb) >= gb->size_in_bits) {
2543  if (gb->size_in_bits == 8 &&
2544  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2545  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2546  return FRAME_SKIPPED; // divx bug
2547  } else
2548  return -1; // end of stream
2549  }
2550 
2551  /* use the bits after the test */
2552  v = get_bits(gb, 8);
2553  startcode = ((startcode << 8) | v) & 0xffffffff;
2554 
2555  if ((startcode & 0xFFFFFF00) != 0x100)
2556  continue; // no startcode
2557 
2558  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2559  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2560  if (startcode <= 0x11F)
2561  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2562  else if (startcode <= 0x12F)
2563  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2564  else if (startcode <= 0x13F)
2565  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2566  else if (startcode <= 0x15F)
2567  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2568  else if (startcode <= 0x1AF)
2569  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2570  else if (startcode == 0x1B0)
2571  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2572  else if (startcode == 0x1B1)
2573  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2574  else if (startcode == 0x1B2)
2575  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2576  else if (startcode == 0x1B3)
2577  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2578  else if (startcode == 0x1B4)
2579  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2580  else if (startcode == 0x1B5)
2581  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2582  else if (startcode == 0x1B6)
2583  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2584  else if (startcode == 0x1B7)
2585  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2586  else if (startcode == 0x1B8)
2587  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2588  else if (startcode == 0x1B9)
2589  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2590  else if (startcode == 0x1BA)
2591  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2592  else if (startcode == 0x1BB)
2593  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2594  else if (startcode == 0x1BC)
2595  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2596  else if (startcode == 0x1BD)
2597  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2598  else if (startcode == 0x1BE)
2599  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2600  else if (startcode == 0x1BF)
2601  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2602  else if (startcode == 0x1C0)
2603  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2604  else if (startcode == 0x1C1)
2605  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2606  else if (startcode == 0x1C2)
2607  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2608  else if (startcode == 0x1C3)
2609  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2610  else if (startcode <= 0x1C5)
2611  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2612  else if (startcode <= 0x1FF)
2613  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2614  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2615  }
2616 
2617  if (startcode >= 0x120 && startcode <= 0x12F) {
2618  if ((ret = decode_vol_header(ctx, gb)) < 0)
2619  return ret;
2620  } else if (startcode == USER_DATA_STARTCODE) {
2621  decode_user_data(ctx, gb);
2622  } else if (startcode == GOP_STARTCODE) {
2623  mpeg4_decode_gop_header(s, gb);
2624  } else if (startcode == VOS_STARTCODE) {
2626  } else if (startcode == VOP_STARTCODE) {
2627  break;
2628  }
2629 
2630  align_get_bits(gb);
2631  startcode = 0xff;
2632  }
2633 
2634 end:
2636  s->low_delay = 1;
2637  s->avctx->has_b_frames = !s->low_delay;
2638 
2639  return decode_vop_header(ctx, gb);
2640 }
2641 
2643  static int done = 0;
2644 
2645  if (!done) {
2652  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2653  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2654  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2655  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2656  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2657  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2658  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2659  &ff_sprite_trajectory_tab[0][1], 4, 2,
2660  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2661  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2662  &ff_mb_type_b_tab[0][1], 2, 1,
2663  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2664  done = 1;
2665  }
2666 }
2667 
2668 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2669 {
2670  Mpeg4DecContext *ctx = avctx->priv_data;
2671  MpegEncContext *s = &ctx->m;
2672 
2673  /* divx 5.01+ bitstream reorder stuff */
2674  /* Since this clobbers the input buffer and hwaccel codecs still need the
2675  * data during hwaccel->end_frame we should not do this any earlier */
2676  if (s->divx_packed) {
2677  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2678  int startcode_found = 0;
2679 
2680  if (buf_size - current_pos > 7) {
2681 
2682  int i;
2683  for (i = current_pos; i < buf_size - 4; i++)
2684 
2685  if (buf[i] == 0 &&
2686  buf[i + 1] == 0 &&
2687  buf[i + 2] == 1 &&
2688  buf[i + 3] == 0xB6) {
2689  startcode_found = !(buf[i + 4] & 0x40);
2690  break;
2691  }
2692  }
2693 
2694  if (startcode_found) {
2695  if (!ctx->showed_packed_warning) {
2696  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2697  "wasteful way to store B-frames ('packed B-frames'). "
2698  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2699  ctx->showed_packed_warning = 1;
2700  }
2703  buf_size - current_pos);
2704  if (!s->bitstream_buffer) {
2705  s->bitstream_buffer_size = 0;
2706  return AVERROR(ENOMEM);
2707  }
2708  memcpy(s->bitstream_buffer, buf + current_pos,
2709  buf_size - current_pos);
2710  s->bitstream_buffer_size = buf_size - current_pos;
2711  }
2712  }
2713 
2714  return 0;
2715 }
2716 
2717 #if HAVE_THREADS
2718 static int mpeg4_update_thread_context(AVCodecContext *dst,
2719  const AVCodecContext *src)
2720 {
2721  Mpeg4DecContext *s = dst->priv_data;
2722  const Mpeg4DecContext *s1 = src->priv_data;
2723  int init = s->m.context_initialized;
2724 
2725  int ret = ff_mpeg_update_thread_context(dst, src);
2726 
2727  if (ret < 0)
2728  return ret;
2729 
2730  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2731 
2732  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2733  ff_xvid_idct_init(&s->m.idsp, dst);
2734 
2735  return 0;
2736 }
2737 #endif
2738 
2740 {
2741  Mpeg4DecContext *ctx = avctx->priv_data;
2742  MpegEncContext *s = &ctx->m;
2743  int ret;
2744 
2745  ctx->divx_version =
2746  ctx->divx_build =
2747  ctx->xvid_build =
2748  ctx->lavc_build = -1;
2749 
2750  if ((ret = ff_h263_decode_init(avctx)) < 0)
2751  return ret;
2752 
2754 
2755  s->h263_pred = 1;
2756  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2758  ctx->time_increment_bits = 4; /* default value for broken headers */
2759 
2761  avctx->internal->allocate_progress = 1;
2762 
2763  return 0;
2764 }
2765 
2766 static const AVOption mpeg4_options[] = {
2767  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2768  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2769  {NULL}
2770 };
2771 
2772 static const AVClass mpeg4_class = {
2773  "MPEG4 Video Decoder",
2775  mpeg4_options,
2777 };
2778 
2780  .name = "mpeg4",
2781  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2782  .type = AVMEDIA_TYPE_VIDEO,
2783  .id = AV_CODEC_ID_MPEG4,
2784  .priv_data_size = sizeof(Mpeg4DecContext),
2785  .init = decode_init,
2786  .close = ff_h263_decode_end,
2791  .flush = ff_mpeg_flush,
2792  .max_lowres = 3,
2795  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2796  .priv_class = &mpeg4_class,
2797 };
2798 
2799 
2800 #if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
2801 static const AVClass mpeg4_vdpau_class = {
2802  "MPEG4 Video VDPAU Decoder",
2804  mpeg4_options,
2806 };
2807 
2808 AVCodec ff_mpeg4_vdpau_decoder = {
2809  .name = "mpeg4_vdpau",
2810  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2811  .type = AVMEDIA_TYPE_VIDEO,
2812  .id = AV_CODEC_ID_MPEG4,
2813  .priv_data_size = sizeof(Mpeg4DecContext),
2814  .init = decode_init,
2815  .close = ff_h263_decode_end,
2819  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2820  AV_PIX_FMT_NONE },
2821  .priv_class = &mpeg4_vdpau_class,
2822 };
2823 #endif
int bitstream_buffer_size
Definition: mpegvideo.h:414
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:382
uint16_t sprite_traj[4][2]
sprite trajectory points
Definition: mpeg4video.h:75
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2987
#define ff_tlog(ctx,...)
Definition: internal.h:65
IDCTDSPContext idsp
Definition: mpegvideo.h:227
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3382
#define MB_TYPE_SKIP
Definition: avcodec.h:1264
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2741
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
int aspect_ratio_info
Definition: mpegvideo.h:400
int picture_number
Definition: mpegvideo.h:124
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2871
ScanTable intra_v_scantable
Definition: mpegvideo.h:90
static int shift(int a, int b)
Definition: sonic.c:82
S(GMC)-VOP MPEG-4.
Definition: avutil.h:277
RLTable ff_mpeg4_rl_intra
Definition: mpeg4data.h:109
const uint8_t ff_mpeg4_c_dc_scale_table[32]
Definition: mpeg4data.h:363
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
Definition: pixfmt.h:495
#define CBPY_VLC_BITS
Definition: h263.h:41
AVOption.
Definition: opt.h:246
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:269
static void flush(AVCodecContext *avctx)
int sprite_warping_accuracy
Definition: mpegvideo.h:401
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG-1 & B-frame MPEG-4
Definition: mpegvideo.h:278
av_cold void ff_mpeg4videodec_static_init(void)
float re
Definition: fft.c:82
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:503
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:247
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:204
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:45
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
int resync_marker
could this stream contain resync markers
Definition: mpeg4video.h:82
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:57
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
int16_t(*[3] ac_val)[16]
used for MPEG-4 AC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:191
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:167
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:392
int num
Numerator.
Definition: rational.h:59
uint8_t * bitstream_buffer
Definition: mpegvideo.h:413
enum AVCodecID codec_id
Definition: mpegvideo.h:109
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2986
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2883
const uint8_t * buffer
Definition: get_bits.h:56
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:63
int av_log2(unsigned v)
Definition: intmath.c:26
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:2093
static av_cold int decode_init(AVCodecContext *avctx)
#define MB_TYPE_INTRA
Definition: mpegutils.h:75
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:120
int real_sprite_warping_points
Definition: mpegvideo.h:394
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2980
mpegvideo header.
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1887
#define DC_VLC_BITS
Definition: mpeg4videodec.c:44
#define DC_MARKER
Definition: mpeg4video.h:54
uint8_t permutated[64]
Definition: idctdsp.h:31
uint8_t run
Definition: svq3.c:206
#define ER_MV_ERROR
int padding_bug_score
used to detect the VERY common padding bug in MPEG-4
Definition: mpegvideo.h:409
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:130
#define src
Definition: vp8dsp.c:254
int profile
profile
Definition: avcodec.h:3188
AVCodec.
Definition: avcodec.h:3607
int time_base
time in seconds of last I,P,S Frame
Definition: mpegvideo.h:387
RLTable.
Definition: rl.h:39
int qscale
QP.
Definition: mpegvideo.h:201
const AVProfile ff_mpeg4_video_profiles[]
Definition: profiles.c:107
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:309
int field_select[2][2]
Definition: mpegvideo.h:277
int block_wrap[6]
Definition: mpegvideo.h:294
int quant_precision
Definition: mpegvideo.h:398
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:2433
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1819
int vol_sprite_usage
Definition: mpeg4video.h:71
static int16_t block[64]
Definition: dct.c:113
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:984
#define USES_LIST(a, list)
Definition: mpegutils.h:101
#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:359
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:47
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (MPEG-4) ...
Definition: mpegvideo.h:264
uint8_t bits
Definition: crc.c:296
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
float delta
AVOptions.
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2924
const uint16_t ff_sprite_trajectory_tab[15][2]
Definition: mpeg4data.h:326
#define VOP_STARTCODE
Definition: mpeg4video.h:60
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
#define IS_3IV1
Definition: mpeg4video.h:170
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:197
Multithreading support functions.
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:878
#define FF_BUG_EDGE
Definition: avcodec.h:2882
int interlaced_dct
Definition: mpegvideo.h:480
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:177
#define CHROMA_420
Definition: mpegvideo.h:472
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
#define RECT_SHAPE
Definition: mpeg4video.h:33
#define height
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:2880
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2879
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:46
#define AV_CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:995
#define ER_MV_END
#define ff_dlog(a,...)
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:330
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:126
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:117
int intra_dc_threshold
QP above which the ac VLC should be used for intra dc.
Definition: mpeg4video.h:92
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2426
#define MAX_LEVEL
Definition: rl.h:36
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:180
#define FF_BUG_IEDGE
Definition: avcodec.h:2887
#define av_log(a,...)
#define MOTION_MARKER
Definition: mpeg4video.h:53
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:730
#define FF_IDCT_AUTO
Definition: avcodec.h:3043
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2804
MpegEncContext m
Definition: mpeg4video.h:66
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:395
#define ROUNDED_DIV(a, b)
Definition: common.h:56
ThreadFrame tf
Definition: mpegpicture.h:47
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2881
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:572
#define FF_IDCT_XVID
Definition: avcodec.h:3056
int16_t * dc_val[3]
used for MPEG-4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:184
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:160
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:2004
uint8_t * mbskip_table
Definition: mpegpicture.h:59
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:192
av_default_item_name
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:403
#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:176
ERContext er
Definition: mpegvideo.h:550
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
const char * r
Definition: vf_curves.c:111
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1777
#define SIMPLE_VO_TYPE
Definition: mpeg4video.h:38
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:40
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2873
#define FF_DEBUG_BUGS
Definition: avcodec.h:2943
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:3614
#define IS_SKIP(a)
Definition: mpegutils.h:83
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:399
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:404
#define SET_QPEL_FUNC(postfix1, postfix2)
GetBitContext gb
Definition: mpegvideo.h:445
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:499
#define CLOSE_READER(name, gb)
Definition: get_bits.h:131
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1022
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
Definition: get_bits.h:494
Definition: vlc.h:26
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2773
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:175
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:215
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:356
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideodata.c:89
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:62
common internal API header
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:396
#define ADV_SIMPLE_VO_TYPE
Definition: mpeg4video.h:44
const uint8_t ff_mpeg4_DCtab_lum[13][2]
Definition: mpeg4data.h:35
uint8_t ff_mpeg4_static_rl_table_store[3][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg4video.c:28
#define MB_TYPE_GMC
Definition: avcodec.h:1263
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:99
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:409
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:953
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:51
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2971
#define MB_TYPE_DIRECT2
Definition: avcodec.h:1261
#define FFMIN(a, b)
Definition: common.h:96
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
#define IS_DIRECT(a)
Definition: mpegutils.h:86
static VLC dc_lum
Definition: mpeg4videodec.c:47
#define width
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:3042
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
#define MB_TYPE_INTERLACED
Definition: avcodec.h:1260
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
#define GRAY_SHAPE
Definition: mpeg4video.h:36
#define ER_DC_END
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:721
AVCodec ff_mpeg4_decoder
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:415
int size_in_bits
Definition: get_bits.h:58
AVFormatContext * ctx
Definition: movenc.c:48
int use_intra_dc_vlc
Definition: mpeg4video.h:89
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:282
#define MB_TYPE_L0L1
Definition: avcodec.h:1271
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
int level
level
Definition: avcodec.h:3286
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:181
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:539
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:83
int n
Definition: avisynth_c.h:684
#define MB_TYPE_ACPRED
Definition: avcodec.h:1262
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:1828
#define MB_TYPE_L1
Definition: avcodec.h:1270
int vol_control_parameters
does the stream contain the low_delay flag, used to work around buggy encoders.
Definition: mpeg4video.h:104
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:348
#define FRAME_SKIPPED
Return value for header parsers if frame is not coded.
Definition: mpegutils.h:34
uint8_t * mbintra_table
used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
Definition: mpegvideo.h:195
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2878
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:483
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:193
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:43
#define FF_BUG_UMP4
Definition: avcodec.h:2872
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:293
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:433
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
decode partition C of one MB.
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:263
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
BlockDSPContext bdsp
Definition: mpegvideo.h:223
int debug
debug
Definition: avcodec.h:2923
main external API structure.
Definition: avcodec.h:1682
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define FASTDIV(a, b)
Definition: mathops.h:211
#define RSHIFT(a, b)
Definition: common.h:54
ScanTable intra_scantable
Definition: mpegvideo.h:88
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
static int get_xbits(GetBitContext *s, int n)
Read MPEG-1 dc-style VLC (sign bit + mantissa with no MSB).
Definition: get_bits.h:218
#define OPEN_READER(name, gb)
Definition: get_bits.h:120
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:39
void * buf
Definition: avisynth_c.h:690
MPEG-4 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstr...
Definition: pixfmt.h:146
#define SLICE_END
end marker found
Definition: mpegvideo.h:502
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:402
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:453
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:324
Describe the class of an AVClass context structure.
Definition: log.h:67
ScanTable intra_h_scantable
Definition: mpegvideo.h:89
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:292
static const AVProfile profiles[]
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:196
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode MPEG-4 headers.
int context_initialized
Definition: mpegvideo.h:121
#define GET_CACHE(name, gb)
Definition: get_bits.h:197
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2984
#define MB_TYPE_16x16
Definition: avcodec.h:1256
RLTable ff_h263_rl_inter
Definition: h263data.c:161
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
#define s1
Definition: regdef.h:38
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:162
const int16_t ff_mpeg4_default_intra_matrix[64]
Definition: mpeg4data.h:337
#define ER_DC_ERROR
int allocate_progress
Whether to allocate progress for frame threading.
Definition: internal.h:126
int f_code
forward MV resolution
Definition: mpegvideo.h:235
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:332
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:77
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:262
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:960
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2867
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:102
static int64_t pts
Global timestamp for the audio frames.
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
uint8_t level
Definition: svq3.c:207
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:276
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:128
MpegEncContext.
Definition: mpegvideo.h:78
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:180
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
int8_t * qscale_table
Definition: mpegpicture.h:50
#define MAX_RUN
Definition: rl.h:35
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
static int mpeg4_is_resync(Mpeg4DecContext *ctx)
check if the next stuff is a resync marker or the end.
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:194
static VLC sprite_trajectory
Definition: mpeg4videodec.c:48
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
#define FF_BUG_AMV
Definition: avcodec.h:2874
static const AVOption mpeg4_options[]
common internal api header.
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:127
if(ret< 0)
Definition: vf_mcdeint.c:282
#define TEX_VLC_BITS
Definition: dv.h:93
static VLC dc_chrom
Definition: mpeg4videodec.c:47
#define MB_TYPE_8x8
Definition: avcodec.h:1259
Bi-dir predicted.
Definition: avutil.h:276
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:49
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
int den
Denominator.
Definition: rational.h:60
const uint8_t ff_alternate_vertical_scan[64]
#define MB_TYPE_16x8
Definition: avcodec.h:1257
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:1724
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2937
#define IS_8X8(a)
Definition: mpegutils.h:91
int len
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1732
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:357
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:497
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:165
#define IS_ACPRED(a)
Definition: mpegutils.h:96
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
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:202
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:255
#define av_uninit(x)
Definition: attributes.h:149
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:69
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:116
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2045
int num_sprite_warping_points
Definition: mpeg4video.h:73
#define stride
#define MV_TYPE_8X8
4 vectors (H.263, MPEG-4 4MV)
Definition: mpegvideo.h:267
int b_code
backward MV resolution for B-frames (MPEG-4)
Definition: mpegvideo.h:236
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2884
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
const uint8_t ff_mb_type_b_tab[4][2]
Definition: mpeg4data.h:332
static int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block, int n, int coded, int intra, int rvlc)
Decode a block.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:959
for(j=16;j >0;--j)
#define MB_TYPE_L0
Definition: avcodec.h:1269
#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
#define GMC_SPRITE
Definition: mpeg4video.h:51