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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 
371  if (shift_c < 0 || shift_y < 0) {
372  avpriv_request_sample(s->avctx, "Too large sprite shift");
373  return AVERROR_PATCHWELCOME;
374  }
375 
376  for (i = 0; i < 2; i++) {
377  s->sprite_offset[0][i] *= 1 << shift_y;
378  s->sprite_offset[1][i] *= 1 << shift_c;
379  s->sprite_delta[0][i] *= 1 << shift_y;
380  s->sprite_delta[1][i] *= 1 << shift_y;
381  ctx->sprite_shift[i] = 16;
382  }
384  }
385 
386  return 0;
387 }
388 
390  MpegEncContext *s = &ctx->m;
391  int len = FFMIN(ctx->time_increment_bits + 3, 15);
392 
393  get_bits(gb, len);
394  if (get_bits1(gb))
395  get_bits(gb, len);
396  check_marker(s->avctx, gb, "after new_pred");
397 
398  return 0;
399 }
400 
401 /**
402  * Decode the next video packet.
403  * @return <0 if something went wrong
404  */
406 {
407  MpegEncContext *s = &ctx->m;
408 
409  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
410  int header_extension = 0, mb_num, len;
411 
412  /* is there enough space left for a video packet + header */
413  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
414  return -1;
415 
416  for (len = 0; len < 32; len++)
417  if (get_bits1(&s->gb))
418  break;
419 
421  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
422  return -1;
423  }
424 
425  if (ctx->shape != RECT_SHAPE) {
426  header_extension = get_bits1(&s->gb);
427  // FIXME more stuff here
428  }
429 
430  mb_num = get_bits(&s->gb, mb_num_bits);
431  if (mb_num >= s->mb_num) {
433  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
434  return -1;
435  }
436 
437  s->mb_x = mb_num % s->mb_width;
438  s->mb_y = mb_num / s->mb_width;
439 
440  if (ctx->shape != BIN_ONLY_SHAPE) {
441  int qscale = get_bits(&s->gb, s->quant_precision);
442  if (qscale)
443  s->chroma_qscale = s->qscale = qscale;
444  }
445 
446  if (ctx->shape == RECT_SHAPE)
447  header_extension = get_bits1(&s->gb);
448 
449  if (header_extension) {
450  int time_incr = 0;
451 
452  while (get_bits1(&s->gb) != 0)
453  time_incr++;
454 
455  check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
456  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
457  check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
458 
459  skip_bits(&s->gb, 2); /* vop coding type */
460  // FIXME not rect stuff here
461 
462  if (ctx->shape != BIN_ONLY_SHAPE) {
463  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
464  // FIXME don't just ignore everything
465  if (s->pict_type == AV_PICTURE_TYPE_S &&
466  ctx->vol_sprite_usage == GMC_SPRITE) {
467  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
468  return AVERROR_INVALIDDATA;
469  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
470  }
471 
472  // FIXME reduced res stuff here
473 
474  if (s->pict_type != AV_PICTURE_TYPE_I) {
475  int f_code = get_bits(&s->gb, 3); /* fcode_for */
476  if (f_code == 0)
478  "Error, video packet header damaged (f_code=0)\n");
479  }
480  if (s->pict_type == AV_PICTURE_TYPE_B) {
481  int b_code = get_bits(&s->gb, 3);
482  if (b_code == 0)
484  "Error, video packet header damaged (b_code=0)\n");
485  }
486  }
487  }
488  if (ctx->new_pred)
489  decode_new_pred(ctx, &s->gb);
490 
491  return 0;
492 }
493 
494 /**
495  * Get the average motion vector for a GMC MB.
496  * @param n either 0 for the x component or 1 for y
497  * @return the average MV for a GMC MB
498  */
499 static inline int get_amv(Mpeg4DecContext *ctx, int n)
500 {
501  MpegEncContext *s = &ctx->m;
502  int x, y, mb_v, sum, dx, dy, shift;
503  int len = 1 << (s->f_code + 4);
504  const int a = s->sprite_warping_accuracy;
505 
506  if (s->workaround_bugs & FF_BUG_AMV)
507  len >>= s->quarter_sample;
508 
509  if (s->real_sprite_warping_points == 1) {
510  if (ctx->divx_version == 500 && ctx->divx_build == 413)
511  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
512  else
513  sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
514  } else {
515  dx = s->sprite_delta[n][0];
516  dy = s->sprite_delta[n][1];
517  shift = ctx->sprite_shift[0];
518  if (n)
519  dy -= 1 << (shift + a + 1);
520  else
521  dx -= 1 << (shift + a + 1);
522  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
523 
524  sum = 0;
525  for (y = 0; y < 16; y++) {
526  int v;
527 
528  v = mb_v + dy * y;
529  // FIXME optimize
530  for (x = 0; x < 16; x++) {
531  sum += v >> shift;
532  v += dx;
533  }
534  }
535  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
536  }
537 
538  if (sum < -len)
539  sum = -len;
540  else if (sum >= len)
541  sum = len - 1;
542 
543  return sum;
544 }
545 
546 /**
547  * Decode the dc value.
548  * @param n block index (0-3 are luma, 4-5 are chroma)
549  * @param dir_ptr the prediction direction will be stored here
550  * @return the quantized dc
551  */
552 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
553 {
554  int level, code;
555 
556  if (n < 4)
557  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
558  else
559  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
560 
561  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
562  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
563  return -1;
564  }
565 
566  if (code == 0) {
567  level = 0;
568  } else {
569  if (IS_3IV1) {
570  if (code == 1)
571  level = 2 * get_bits1(&s->gb) - 1;
572  else {
573  if (get_bits1(&s->gb))
574  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
575  else
576  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
577  }
578  } else {
579  level = get_xbits(&s->gb, code);
580  }
581 
582  if (code > 8) {
583  if (get_bits1(&s->gb) == 0) { /* marker */
585  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
586  return -1;
587  }
588  }
589  }
590  }
591 
592  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
593 }
594 
595 /**
596  * Decode first partition.
597  * @return number of MBs decoded or <0 if an error occurred
598  */
600 {
601  MpegEncContext *s = &ctx->m;
602  int mb_num = 0;
603  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
604 
605  /* decode first partition */
606  s->first_slice_line = 1;
607  for (; s->mb_y < s->mb_height; s->mb_y++) {
609  for (; s->mb_x < s->mb_width; s->mb_x++) {
610  const int xy = s->mb_x + s->mb_y * s->mb_stride;
611  int cbpc;
612  int dir = 0;
613 
614  mb_num++;
616  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
617  s->first_slice_line = 0;
618 
619  if (s->pict_type == AV_PICTURE_TYPE_I) {
620  int i;
621 
622  do {
623  if (show_bits_long(&s->gb, 19) == DC_MARKER)
624  return mb_num - 1;
625 
627  if (cbpc < 0) {
629  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
630  return -1;
631  }
632  } while (cbpc == 8);
633 
634  s->cbp_table[xy] = cbpc & 3;
636  s->mb_intra = 1;
637 
638  if (cbpc & 4)
639  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
640 
641  s->current_picture.qscale_table[xy] = s->qscale;
642 
643  s->mbintra_table[xy] = 1;
644  for (i = 0; i < 6; i++) {
645  int dc_pred_dir;
646  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
647  if (dc < 0) {
649  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
650  return -1;
651  }
652  dir <<= 1;
653  if (dc_pred_dir)
654  dir |= 1;
655  }
656  s->pred_dir_table[xy] = dir;
657  } else { /* P/S_TYPE */
658  int mx, my, pred_x, pred_y, bits;
659  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
660  const int stride = s->b8_stride * 2;
661 
662 try_again:
663  bits = show_bits(&s->gb, 17);
664  if (bits == MOTION_MARKER)
665  return mb_num - 1;
666 
667  skip_bits1(&s->gb);
668  if (bits & 0x10000) {
669  /* skip mb */
670  if (s->pict_type == AV_PICTURE_TYPE_S &&
671  ctx->vol_sprite_usage == GMC_SPRITE) {
673  MB_TYPE_16x16 |
674  MB_TYPE_GMC |
675  MB_TYPE_L0;
676  mx = get_amv(ctx, 0);
677  my = get_amv(ctx, 1);
678  } else {
680  MB_TYPE_16x16 |
681  MB_TYPE_L0;
682  mx = my = 0;
683  }
684  mot_val[0] =
685  mot_val[2] =
686  mot_val[0 + stride] =
687  mot_val[2 + stride] = mx;
688  mot_val[1] =
689  mot_val[3] =
690  mot_val[1 + stride] =
691  mot_val[3 + stride] = my;
692 
693  if (s->mbintra_table[xy])
695  continue;
696  }
697 
699  if (cbpc < 0) {
701  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
702  return -1;
703  }
704  if (cbpc == 20)
705  goto try_again;
706 
707  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
708 
709  s->mb_intra = ((cbpc & 4) != 0);
710 
711  if (s->mb_intra) {
713  s->mbintra_table[xy] = 1;
714  mot_val[0] =
715  mot_val[2] =
716  mot_val[0 + stride] =
717  mot_val[2 + stride] = 0;
718  mot_val[1] =
719  mot_val[3] =
720  mot_val[1 + stride] =
721  mot_val[3 + stride] = 0;
722  } else {
723  if (s->mbintra_table[xy])
725 
726  if (s->pict_type == AV_PICTURE_TYPE_S &&
727  ctx->vol_sprite_usage == GMC_SPRITE &&
728  (cbpc & 16) == 0)
729  s->mcsel = get_bits1(&s->gb);
730  else
731  s->mcsel = 0;
732 
733  if ((cbpc & 16) == 0) {
734  /* 16x16 motion prediction */
735 
736  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
737  if (!s->mcsel) {
738  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
739  if (mx >= 0xffff)
740  return -1;
741 
742  my = ff_h263_decode_motion(s, pred_y, s->f_code);
743  if (my >= 0xffff)
744  return -1;
746  MB_TYPE_L0;
747  } else {
748  mx = get_amv(ctx, 0);
749  my = get_amv(ctx, 1);
751  MB_TYPE_GMC |
752  MB_TYPE_L0;
753  }
754 
755  mot_val[0] =
756  mot_val[2] =
757  mot_val[0 + stride] =
758  mot_val[2 + stride] = mx;
759  mot_val[1] =
760  mot_val[3] =
761  mot_val[1 + stride] =
762  mot_val[3 + stride] = my;
763  } else {
764  int i;
766  MB_TYPE_L0;
767  for (i = 0; i < 4; i++) {
768  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
769  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
770  if (mx >= 0xffff)
771  return -1;
772 
773  my = ff_h263_decode_motion(s, pred_y, s->f_code);
774  if (my >= 0xffff)
775  return -1;
776  mot_val[0] = mx;
777  mot_val[1] = my;
778  }
779  }
780  }
781  }
782  }
783  s->mb_x = 0;
784  }
785 
786  return mb_num;
787 }
788 
789 /**
790  * decode second partition.
791  * @return <0 if an error occurred
792  */
793 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
794 {
795  int mb_num = 0;
796  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
797 
798  s->mb_x = s->resync_mb_x;
799  s->first_slice_line = 1;
800  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
802  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
803  const int xy = s->mb_x + s->mb_y * s->mb_stride;
804 
805  mb_num++;
807  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
808  s->first_slice_line = 0;
809 
810  if (s->pict_type == AV_PICTURE_TYPE_I) {
811  int ac_pred = get_bits1(&s->gb);
812  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
813  if (cbpy < 0) {
815  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
816  return -1;
817  }
818 
819  s->cbp_table[xy] |= cbpy << 2;
820  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
821  } else { /* P || S_TYPE */
822  if (IS_INTRA(s->current_picture.mb_type[xy])) {
823  int i;
824  int dir = 0;
825  int ac_pred = get_bits1(&s->gb);
826  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
827 
828  if (cbpy < 0) {
830  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
831  return -1;
832  }
833 
834  if (s->cbp_table[xy] & 8)
835  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
836  s->current_picture.qscale_table[xy] = s->qscale;
837 
838  for (i = 0; i < 6; i++) {
839  int dc_pred_dir;
840  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
841  if (dc < 0) {
843  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
844  return -1;
845  }
846  dir <<= 1;
847  if (dc_pred_dir)
848  dir |= 1;
849  }
850  s->cbp_table[xy] &= 3; // remove dquant
851  s->cbp_table[xy] |= cbpy << 2;
852  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
853  s->pred_dir_table[xy] = dir;
854  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
855  s->current_picture.qscale_table[xy] = s->qscale;
856  s->cbp_table[xy] = 0;
857  } else {
858  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
859 
860  if (cbpy < 0) {
862  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
863  return -1;
864  }
865 
866  if (s->cbp_table[xy] & 8)
867  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
868  s->current_picture.qscale_table[xy] = s->qscale;
869 
870  s->cbp_table[xy] &= 3; // remove dquant
871  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
872  }
873  }
874  }
875  if (mb_num >= mb_count)
876  return 0;
877  s->mb_x = 0;
878  }
879  return 0;
880 }
881 
882 /**
883  * Decode the first and second partition.
884  * @return <0 if error (and sets error type in the error_status_table)
885  */
887 {
888  MpegEncContext *s = &ctx->m;
889  int mb_num;
890  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
891  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
892 
893  mb_num = mpeg4_decode_partition_a(ctx);
894  if (mb_num <= 0) {
896  s->mb_x, s->mb_y, part_a_error);
897  return -1;
898  }
899 
900  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
901  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
903  s->mb_x, s->mb_y, part_a_error);
904  return -1;
905  }
906 
907  s->mb_num_left = mb_num;
908 
909  if (s->pict_type == AV_PICTURE_TYPE_I) {
910  while (show_bits(&s->gb, 9) == 1)
911  skip_bits(&s->gb, 9);
912  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
914  "marker missing after first I partition at %d %d\n",
915  s->mb_x, s->mb_y);
916  return -1;
917  }
918  } else {
919  while (show_bits(&s->gb, 10) == 1)
920  skip_bits(&s->gb, 10);
921  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
923  "marker missing after first P partition at %d %d\n",
924  s->mb_x, s->mb_y);
925  return -1;
926  }
927  }
929  s->mb_x - 1, s->mb_y, part_a_end);
930 
931  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
932  if (s->pict_type == AV_PICTURE_TYPE_P)
934  s->mb_x, s->mb_y, ER_DC_ERROR);
935  return -1;
936  } else {
937  if (s->pict_type == AV_PICTURE_TYPE_P)
939  s->mb_x - 1, s->mb_y, ER_DC_END);
940  }
941 
942  return 0;
943 }
944 
945 /**
946  * Decode a block.
947  * @return <0 if an error occurred
948  */
949 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
950  int n, int coded, int intra, int rvlc)
951 {
952  MpegEncContext *s = &ctx->m;
953  int level, i, last, run, qmul, qadd;
954  int av_uninit(dc_pred_dir);
955  RLTable *rl;
956  RL_VLC_ELEM *rl_vlc;
957  const uint8_t *scan_table;
958 
959  // Note intra & rvlc should be optimized away if this is inlined
960 
961  if (intra) {
962  if (ctx->use_intra_dc_vlc) {
963  /* DC coef */
964  if (s->partitioned_frame) {
965  level = s->dc_val[0][s->block_index[n]];
966  if (n < 4)
967  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
968  else
969  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
970  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
971  } else {
972  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
973  if (level < 0)
974  return -1;
975  }
976  block[0] = level;
977  i = 0;
978  } else {
979  i = -1;
980  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
981  }
982  if (!coded)
983  goto not_coded;
984 
985  if (rvlc) {
986  rl = &ff_rvlc_rl_intra;
987  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
988  } else {
989  rl = &ff_mpeg4_rl_intra;
990  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
991  }
992  if (s->ac_pred) {
993  if (dc_pred_dir == 0)
994  scan_table = s->intra_v_scantable.permutated; /* left */
995  else
996  scan_table = s->intra_h_scantable.permutated; /* top */
997  } else {
998  scan_table = s->intra_scantable.permutated;
999  }
1000  qmul = 1;
1001  qadd = 0;
1002  } else {
1003  i = -1;
1004  if (!coded) {
1005  s->block_last_index[n] = i;
1006  return 0;
1007  }
1008  if (rvlc)
1009  rl = &ff_rvlc_rl_inter;
1010  else
1011  rl = &ff_h263_rl_inter;
1012 
1013  scan_table = s->intra_scantable.permutated;
1014 
1015  if (s->mpeg_quant) {
1016  qmul = 1;
1017  qadd = 0;
1018  if (rvlc)
1019  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1020  else
1021  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1022  } else {
1023  qmul = s->qscale << 1;
1024  qadd = (s->qscale - 1) | 1;
1025  if (rvlc)
1026  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1027  else
1028  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1029  }
1030  }
1031  {
1032  OPEN_READER(re, &s->gb);
1033  for (;;) {
1034  UPDATE_CACHE(re, &s->gb);
1035  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1036  if (level == 0) {
1037  /* escape */
1038  if (rvlc) {
1039  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1041  "1. marker bit missing in rvlc esc\n");
1042  return -1;
1043  }
1044  SKIP_CACHE(re, &s->gb, 1);
1045 
1046  last = SHOW_UBITS(re, &s->gb, 1);
1047  SKIP_CACHE(re, &s->gb, 1);
1048  run = SHOW_UBITS(re, &s->gb, 6);
1049  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1050  UPDATE_CACHE(re, &s->gb);
1051 
1052  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1054  "2. marker bit missing in rvlc esc\n");
1055  return -1;
1056  }
1057  SKIP_CACHE(re, &s->gb, 1);
1058 
1059  level = SHOW_UBITS(re, &s->gb, 11);
1060  SKIP_CACHE(re, &s->gb, 11);
1061 
1062  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1063  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1064  return -1;
1065  }
1066  SKIP_CACHE(re, &s->gb, 5);
1067 
1068  level = level * qmul + qadd;
1069  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1070  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1071 
1072  i += run + 1;
1073  if (last)
1074  i += 192;
1075  } else {
1076  int cache;
1077  cache = GET_CACHE(re, &s->gb);
1078 
1079  if (IS_3IV1)
1080  cache ^= 0xC0000000;
1081 
1082  if (cache & 0x80000000) {
1083  if (cache & 0x40000000) {
1084  /* third escape */
1085  SKIP_CACHE(re, &s->gb, 2);
1086  last = SHOW_UBITS(re, &s->gb, 1);
1087  SKIP_CACHE(re, &s->gb, 1);
1088  run = SHOW_UBITS(re, &s->gb, 6);
1089  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1090  UPDATE_CACHE(re, &s->gb);
1091 
1092  if (IS_3IV1) {
1093  level = SHOW_SBITS(re, &s->gb, 12);
1094  LAST_SKIP_BITS(re, &s->gb, 12);
1095  } else {
1096  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1098  "1. marker bit missing in 3. esc\n");
1099  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1100  return -1;
1101  }
1102  SKIP_CACHE(re, &s->gb, 1);
1103 
1104  level = SHOW_SBITS(re, &s->gb, 12);
1105  SKIP_CACHE(re, &s->gb, 12);
1106 
1107  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1109  "2. marker bit missing in 3. esc\n");
1110  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1111  return -1;
1112  }
1113 
1114  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1115  }
1116 
1117 #if 0
1118  if (s->error_recognition >= FF_ER_COMPLIANT) {
1119  const int abs_level= FFABS(level);
1120  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1121  const int run1= run - rl->max_run[last][abs_level] - 1;
1122  if (abs_level <= rl->max_level[last][run]) {
1123  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1124  return -1;
1125  }
1126  if (s->error_recognition > FF_ER_COMPLIANT) {
1127  if (abs_level <= rl->max_level[last][run]*2) {
1128  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1129  return -1;
1130  }
1131  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1132  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1133  return -1;
1134  }
1135  }
1136  }
1137  }
1138 #endif
1139  if (level > 0)
1140  level = level * qmul + qadd;
1141  else
1142  level = level * qmul - qadd;
1143 
1144  if ((unsigned)(level + 2048) > 4095) {
1146  if (level > 2560 || level < -2560) {
1148  "|level| overflow in 3. esc, qp=%d\n",
1149  s->qscale);
1150  return -1;
1151  }
1152  }
1153  level = level < 0 ? -2048 : 2047;
1154  }
1155 
1156  i += run + 1;
1157  if (last)
1158  i += 192;
1159  } else {
1160  /* second escape */
1161  SKIP_BITS(re, &s->gb, 2);
1162  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1163  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1164  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1165  LAST_SKIP_BITS(re, &s->gb, 1);
1166  }
1167  } else {
1168  /* first escape */
1169  SKIP_BITS(re, &s->gb, 1);
1170  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1171  i += run;
1172  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
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  }
1177  } else {
1178  i += run;
1179  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1180  LAST_SKIP_BITS(re, &s->gb, 1);
1181  }
1182  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1183  if (i > 62) {
1184  i -= 192;
1185  if (i & (~63)) {
1187  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1188  return -1;
1189  }
1190 
1191  block[scan_table[i]] = level;
1192  break;
1193  }
1194 
1195  block[scan_table[i]] = level;
1196  }
1197  CLOSE_READER(re, &s->gb);
1198  }
1199 
1200 not_coded:
1201  if (intra) {
1202  if (!ctx->use_intra_dc_vlc) {
1203  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1204 
1205  i -= i >> 31; // if (i == -1) i = 0;
1206  }
1207 
1208  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1209  if (s->ac_pred)
1210  i = 63; // FIXME not optimal
1211  }
1212  s->block_last_index[n] = i;
1213  return 0;
1214 }
1215 
1216 /**
1217  * decode partition C of one MB.
1218  * @return <0 if an error occurred
1219  */
1221 {
1223  int cbp, mb_type;
1224  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1225 
1226  mb_type = s->current_picture.mb_type[xy];
1227  cbp = s->cbp_table[xy];
1228 
1229  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1230 
1231  if (s->current_picture.qscale_table[xy] != s->qscale)
1233 
1234  if (s->pict_type == AV_PICTURE_TYPE_P ||
1235  s->pict_type == AV_PICTURE_TYPE_S) {
1236  int i;
1237  for (i = 0; i < 4; i++) {
1238  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1239  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1240  }
1241  s->mb_intra = IS_INTRA(mb_type);
1242 
1243  if (IS_SKIP(mb_type)) {
1244  /* skip mb */
1245  for (i = 0; i < 6; i++)
1246  s->block_last_index[i] = -1;
1247  s->mv_dir = MV_DIR_FORWARD;
1248  s->mv_type = MV_TYPE_16X16;
1250  && ctx->vol_sprite_usage == GMC_SPRITE) {
1251  s->mcsel = 1;
1252  s->mb_skipped = 0;
1253  } else {
1254  s->mcsel = 0;
1255  s->mb_skipped = 1;
1256  }
1257  } else if (s->mb_intra) {
1259  } else if (!s->mb_intra) {
1260  // s->mcsel = 0; // FIXME do we need to init that?
1261 
1262  s->mv_dir = MV_DIR_FORWARD;
1263  if (IS_8X8(mb_type)) {
1264  s->mv_type = MV_TYPE_8X8;
1265  } else {
1266  s->mv_type = MV_TYPE_16X16;
1267  }
1268  }
1269  } else { /* I-Frame */
1270  s->mb_intra = 1;
1272  }
1273 
1274  if (!IS_SKIP(mb_type)) {
1275  int i;
1276  s->bdsp.clear_blocks(s->block[0]);
1277  /* decode each block */
1278  for (i = 0; i < 6; i++) {
1279  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1281  "texture corrupted at %d %d %d\n",
1282  s->mb_x, s->mb_y, s->mb_intra);
1283  return -1;
1284  }
1285  cbp += cbp;
1286  }
1287  }
1288 
1289  /* per-MB end of slice check */
1290  if (--s->mb_num_left <= 0) {
1291  if (mpeg4_is_resync(ctx))
1292  return SLICE_END;
1293  else
1294  return SLICE_NOEND;
1295  } else {
1296  if (mpeg4_is_resync(ctx)) {
1297  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1298  if (s->cbp_table[xy + delta])
1299  return SLICE_END;
1300  }
1301  return SLICE_OK;
1302  }
1303 }
1304 
1305 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1306 {
1308  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1309  int16_t *mot_val;
1310  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1311  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1312 
1313  av_assert2(s->h263_pred);
1314 
1315  if (s->pict_type == AV_PICTURE_TYPE_P ||
1316  s->pict_type == AV_PICTURE_TYPE_S) {
1317  do {
1318  if (get_bits1(&s->gb)) {
1319  /* skip mb */
1320  s->mb_intra = 0;
1321  for (i = 0; i < 6; i++)
1322  s->block_last_index[i] = -1;
1323  s->mv_dir = MV_DIR_FORWARD;
1324  s->mv_type = MV_TYPE_16X16;
1325  if (s->pict_type == AV_PICTURE_TYPE_S &&
1326  ctx->vol_sprite_usage == GMC_SPRITE) {
1328  MB_TYPE_GMC |
1329  MB_TYPE_16x16 |
1330  MB_TYPE_L0;
1331  s->mcsel = 1;
1332  s->mv[0][0][0] = get_amv(ctx, 0);
1333  s->mv[0][0][1] = get_amv(ctx, 1);
1334  s->mb_skipped = 0;
1335  } else {
1337  MB_TYPE_16x16 |
1338  MB_TYPE_L0;
1339  s->mcsel = 0;
1340  s->mv[0][0][0] = 0;
1341  s->mv[0][0][1] = 0;
1342  s->mb_skipped = 1;
1343  }
1344  goto end;
1345  }
1347  if (cbpc < 0) {
1349  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1350  return -1;
1351  }
1352  } while (cbpc == 20);
1353 
1354  s->bdsp.clear_blocks(s->block[0]);
1355  dquant = cbpc & 8;
1356  s->mb_intra = ((cbpc & 4) != 0);
1357  if (s->mb_intra)
1358  goto intra;
1359 
1360  if (s->pict_type == AV_PICTURE_TYPE_S &&
1361  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1362  s->mcsel = get_bits1(&s->gb);
1363  else
1364  s->mcsel = 0;
1365  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1366  if (cbpy < 0) {
1368  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1369  return AVERROR_INVALIDDATA;
1370  }
1371 
1372  cbp = (cbpc & 3) | (cbpy << 2);
1373  if (dquant)
1374  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1375  if ((!s->progressive_sequence) &&
1376  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1377  s->interlaced_dct = get_bits1(&s->gb);
1378 
1379  s->mv_dir = MV_DIR_FORWARD;
1380  if ((cbpc & 16) == 0) {
1381  if (s->mcsel) {
1383  MB_TYPE_16x16 |
1384  MB_TYPE_L0;
1385  /* 16x16 global motion prediction */
1386  s->mv_type = MV_TYPE_16X16;
1387  mx = get_amv(ctx, 0);
1388  my = get_amv(ctx, 1);
1389  s->mv[0][0][0] = mx;
1390  s->mv[0][0][1] = my;
1391  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1393  MB_TYPE_L0 |
1395  /* 16x8 field motion prediction */
1396  s->mv_type = MV_TYPE_FIELD;
1397 
1398  s->field_select[0][0] = get_bits1(&s->gb);
1399  s->field_select[0][1] = get_bits1(&s->gb);
1400 
1401  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1402 
1403  for (i = 0; i < 2; i++) {
1404  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1405  if (mx >= 0xffff)
1406  return -1;
1407 
1408  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1409  if (my >= 0xffff)
1410  return -1;
1411 
1412  s->mv[0][i][0] = mx;
1413  s->mv[0][i][1] = my;
1414  }
1415  } else {
1417  /* 16x16 motion prediction */
1418  s->mv_type = MV_TYPE_16X16;
1419  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1420  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1421 
1422  if (mx >= 0xffff)
1423  return -1;
1424 
1425  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1426 
1427  if (my >= 0xffff)
1428  return -1;
1429  s->mv[0][0][0] = mx;
1430  s->mv[0][0][1] = my;
1431  }
1432  } else {
1434  s->mv_type = MV_TYPE_8X8;
1435  for (i = 0; i < 4; i++) {
1436  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1437  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1438  if (mx >= 0xffff)
1439  return -1;
1440 
1441  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1442  if (my >= 0xffff)
1443  return -1;
1444  s->mv[0][i][0] = mx;
1445  s->mv[0][i][1] = my;
1446  mot_val[0] = mx;
1447  mot_val[1] = my;
1448  }
1449  }
1450  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1451  int modb1; // first bit of modb
1452  int modb2; // second bit of modb
1453  int mb_type;
1454 
1455  s->mb_intra = 0; // B-frames never contain intra blocks
1456  s->mcsel = 0; // ... true gmc blocks
1457 
1458  if (s->mb_x == 0) {
1459  for (i = 0; i < 2; i++) {
1460  s->last_mv[i][0][0] =
1461  s->last_mv[i][0][1] =
1462  s->last_mv[i][1][0] =
1463  s->last_mv[i][1][1] = 0;
1464  }
1465 
1467  }
1468 
1469  /* if we skipped it in the future P-frame than skip it now too */
1470  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1471 
1472  if (s->mb_skipped) {
1473  /* skip mb */
1474  for (i = 0; i < 6; i++)
1475  s->block_last_index[i] = -1;
1476 
1477  s->mv_dir = MV_DIR_FORWARD;
1478  s->mv_type = MV_TYPE_16X16;
1479  s->mv[0][0][0] =
1480  s->mv[0][0][1] =
1481  s->mv[1][0][0] =
1482  s->mv[1][0][1] = 0;
1484  MB_TYPE_16x16 |
1485  MB_TYPE_L0;
1486  goto end;
1487  }
1488 
1489  modb1 = get_bits1(&s->gb);
1490  if (modb1) {
1491  // like MB_TYPE_B_DIRECT but no vectors coded
1493  cbp = 0;
1494  } else {
1495  modb2 = get_bits1(&s->gb);
1496  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1497  if (mb_type < 0) {
1498  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1499  return -1;
1500  }
1501  mb_type = mb_type_b_map[mb_type];
1502  if (modb2) {
1503  cbp = 0;
1504  } else {
1505  s->bdsp.clear_blocks(s->block[0]);
1506  cbp = get_bits(&s->gb, 6);
1507  }
1508 
1509  if ((!IS_DIRECT(mb_type)) && cbp) {
1510  if (get_bits1(&s->gb))
1511  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1512  }
1513 
1514  if (!s->progressive_sequence) {
1515  if (cbp)
1516  s->interlaced_dct = get_bits1(&s->gb);
1517 
1518  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1519  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1520  mb_type &= ~MB_TYPE_16x16;
1521 
1522  if (USES_LIST(mb_type, 0)) {
1523  s->field_select[0][0] = get_bits1(&s->gb);
1524  s->field_select[0][1] = get_bits1(&s->gb);
1525  }
1526  if (USES_LIST(mb_type, 1)) {
1527  s->field_select[1][0] = get_bits1(&s->gb);
1528  s->field_select[1][1] = get_bits1(&s->gb);
1529  }
1530  }
1531  }
1532 
1533  s->mv_dir = 0;
1534  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1535  s->mv_type = MV_TYPE_16X16;
1536 
1537  if (USES_LIST(mb_type, 0)) {
1538  s->mv_dir = MV_DIR_FORWARD;
1539 
1540  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1541  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1542  s->last_mv[0][1][0] =
1543  s->last_mv[0][0][0] =
1544  s->mv[0][0][0] = mx;
1545  s->last_mv[0][1][1] =
1546  s->last_mv[0][0][1] =
1547  s->mv[0][0][1] = my;
1548  }
1549 
1550  if (USES_LIST(mb_type, 1)) {
1551  s->mv_dir |= MV_DIR_BACKWARD;
1552 
1553  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1554  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1555  s->last_mv[1][1][0] =
1556  s->last_mv[1][0][0] =
1557  s->mv[1][0][0] = mx;
1558  s->last_mv[1][1][1] =
1559  s->last_mv[1][0][1] =
1560  s->mv[1][0][1] = my;
1561  }
1562  } else if (!IS_DIRECT(mb_type)) {
1563  s->mv_type = MV_TYPE_FIELD;
1564 
1565  if (USES_LIST(mb_type, 0)) {
1566  s->mv_dir = MV_DIR_FORWARD;
1567 
1568  for (i = 0; i < 2; i++) {
1569  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1570  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1571  s->last_mv[0][i][0] =
1572  s->mv[0][i][0] = mx;
1573  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1574  }
1575  }
1576 
1577  if (USES_LIST(mb_type, 1)) {
1578  s->mv_dir |= MV_DIR_BACKWARD;
1579 
1580  for (i = 0; i < 2; i++) {
1581  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1582  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1583  s->last_mv[1][i][0] =
1584  s->mv[1][i][0] = mx;
1585  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1586  }
1587  }
1588  }
1589  }
1590 
1591  if (IS_DIRECT(mb_type)) {
1592  if (IS_SKIP(mb_type)) {
1593  mx =
1594  my = 0;
1595  } else {
1596  mx = ff_h263_decode_motion(s, 0, 1);
1597  my = ff_h263_decode_motion(s, 0, 1);
1598  }
1599 
1601  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1602  }
1603  s->current_picture.mb_type[xy] = mb_type;
1604  } else { /* I-Frame */
1605  do {
1607  if (cbpc < 0) {
1609  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1610  return -1;
1611  }
1612  } while (cbpc == 8);
1613 
1614  dquant = cbpc & 4;
1615  s->mb_intra = 1;
1616 
1617 intra:
1618  s->ac_pred = get_bits1(&s->gb);
1619  if (s->ac_pred)
1621  else
1623 
1624  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1625  if (cbpy < 0) {
1627  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1628  return -1;
1629  }
1630  cbp = (cbpc & 3) | (cbpy << 2);
1631 
1632  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1633 
1634  if (dquant)
1635  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1636 
1637  if (!s->progressive_sequence)
1638  s->interlaced_dct = get_bits1(&s->gb);
1639 
1640  s->bdsp.clear_blocks(s->block[0]);
1641  /* decode each block */
1642  for (i = 0; i < 6; i++) {
1643  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1644  return -1;
1645  cbp += cbp;
1646  }
1647  goto end;
1648  }
1649 
1650  /* decode each block */
1651  for (i = 0; i < 6; i++) {
1652  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1653  return -1;
1654  cbp += cbp;
1655  }
1656 
1657 end:
1658  /* per-MB end of slice check */
1659  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1660  int next = mpeg4_is_resync(ctx);
1661  if (next) {
1662  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1663  return -1;
1664  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1665  return SLICE_END;
1666 
1667  if (s->pict_type == AV_PICTURE_TYPE_B) {
1668  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1670  (s->mb_x + delta >= s->mb_width)
1671  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1672  : s->mb_y, 0);
1673  if (s->next_picture.mbskip_table[xy + delta])
1674  return SLICE_OK;
1675  }
1676 
1677  return SLICE_END;
1678  }
1679  }
1680 
1681  return SLICE_OK;
1682 }
1683 
1685 {
1686  int hours, minutes, seconds;
1687 
1688  if (!show_bits(gb, 23)) {
1689  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1690  return -1;
1691  }
1692 
1693  hours = get_bits(gb, 5);
1694  minutes = get_bits(gb, 6);
1695  check_marker(s->avctx, gb, "in gop_header");
1696  seconds = get_bits(gb, 6);
1697 
1698  s->time_base = seconds + 60*(minutes + 60*hours);
1699 
1700  skip_bits1(gb);
1701  skip_bits1(gb);
1702 
1703  return 0;
1704 }
1705 
1707 {
1708 
1709  s->avctx->profile = get_bits(gb, 4);
1710  s->avctx->level = get_bits(gb, 4);
1711 
1712  // for Simple profile, level 0
1713  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1714  s->avctx->level = 0;
1715  }
1716 
1717  return 0;
1718 }
1719 
1721 {
1722  MpegEncContext *s = &ctx->m;
1723  int width, height, vo_ver_id;
1724 
1725  /* vol header */
1726  skip_bits(gb, 1); /* random access */
1727  s->vo_type = get_bits(gb, 8);
1728  if (get_bits1(gb) != 0) { /* is_ol_id */
1729  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1730  skip_bits(gb, 3); /* vo_priority */
1731  } else {
1732  vo_ver_id = 1;
1733  }
1734  s->aspect_ratio_info = get_bits(gb, 4);
1736  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1737  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1738  } else {
1740  }
1741 
1742  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1743  int chroma_format = get_bits(gb, 2);
1744  if (chroma_format != CHROMA_420)
1745  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1746 
1747  s->low_delay = get_bits1(gb);
1748  if (get_bits1(gb)) { /* vbv parameters */
1749  get_bits(gb, 15); /* first_half_bitrate */
1750  check_marker(s->avctx, gb, "after first_half_bitrate");
1751  get_bits(gb, 15); /* latter_half_bitrate */
1752  check_marker(s->avctx, gb, "after latter_half_bitrate");
1753  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1754  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1755  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1756  get_bits(gb, 11); /* first_half_vbv_occupancy */
1757  check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1758  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1759  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1760  }
1761  } else {
1762  /* is setting low delay flag only once the smartest thing to do?
1763  * low delay detection will not be overridden. */
1764  if (s->picture_number == 0) {
1765  switch(s->vo_type) {
1766  case SIMPLE_VO_TYPE:
1767  case ADV_SIMPLE_VO_TYPE:
1768  s->low_delay = 1;
1769  break;
1770  default:
1771  s->low_delay = 0;
1772  }
1773  }
1774  }
1775 
1776  ctx->shape = get_bits(gb, 2); /* vol shape */
1777  if (ctx->shape != RECT_SHAPE)
1778  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1779  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1780  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1781  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1782  }
1783 
1784  check_marker(s->avctx, gb, "before time_increment_resolution");
1785 
1786  s->avctx->framerate.num = get_bits(gb, 16);
1787  if (!s->avctx->framerate.num) {
1788  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1789  return AVERROR_INVALIDDATA;
1790  }
1791 
1792  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1793  if (ctx->time_increment_bits < 1)
1794  ctx->time_increment_bits = 1;
1795 
1796  check_marker(s->avctx, gb, "before fixed_vop_rate");
1797 
1798  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1800  else
1801  s->avctx->framerate.den = 1;
1802 
1804 
1805  ctx->t_frame = 0;
1806 
1807  if (ctx->shape != BIN_ONLY_SHAPE) {
1808  if (ctx->shape == RECT_SHAPE) {
1809  check_marker(s->avctx, gb, "before width");
1810  width = get_bits(gb, 13);
1811  check_marker(s->avctx, gb, "before height");
1812  height = get_bits(gb, 13);
1813  check_marker(s->avctx, gb, "after height");
1814  if (width && height && /* they should be non zero but who knows */
1815  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1816  if (s->width && s->height &&
1817  (s->width != width || s->height != height))
1818  s->context_reinit = 1;
1819  s->width = width;
1820  s->height = height;
1821  }
1822  }
1823 
1824  s->progressive_sequence =
1825  s->progressive_frame = get_bits1(gb) ^ 1;
1826  s->interlaced_dct = 0;
1827  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1828  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1829  "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1830  if (vo_ver_id == 1)
1831  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1832  else
1833  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1834 
1835  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1836  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1837  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1838  ctx->vol_sprite_usage == GMC_SPRITE) {
1839  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1840  skip_bits(gb, 13); // sprite_width
1841  check_marker(s->avctx, gb, "after sprite_width");
1842  skip_bits(gb, 13); // sprite_height
1843  check_marker(s->avctx, gb, "after sprite_height");
1844  skip_bits(gb, 13); // sprite_left
1845  check_marker(s->avctx, gb, "after sprite_left");
1846  skip_bits(gb, 13); // sprite_top
1847  check_marker(s->avctx, gb, "after sprite_top");
1848  }
1849  ctx->num_sprite_warping_points = get_bits(gb, 6);
1850  if (ctx->num_sprite_warping_points > 3) {
1851  av_log(s->avctx, AV_LOG_ERROR,
1852  "%d sprite_warping_points\n",
1853  ctx->num_sprite_warping_points);
1854  ctx->num_sprite_warping_points = 0;
1855  return AVERROR_INVALIDDATA;
1856  }
1857  s->sprite_warping_accuracy = get_bits(gb, 2);
1858  ctx->sprite_brightness_change = get_bits1(gb);
1859  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1860  skip_bits1(gb); // low_latency_sprite
1861  }
1862  // FIXME sadct disable bit if verid!=1 && shape not rect
1863 
1864  if (get_bits1(gb) == 1) { /* not_8_bit */
1865  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1866  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1867  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1868  if (s->quant_precision != 5)
1869  av_log(s->avctx, AV_LOG_ERROR,
1870  "quant precision %d\n", s->quant_precision);
1871  if (s->quant_precision<3 || s->quant_precision>9) {
1872  s->quant_precision = 5;
1873  }
1874  } else {
1875  s->quant_precision = 5;
1876  }
1877 
1878  // FIXME a bunch of grayscale shape things
1879 
1880  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1881  int i, v;
1882 
1883  /* load default matrixes */
1884  for (i = 0; i < 64; i++) {
1885  int j = s->idsp.idct_permutation[i];
1887  s->intra_matrix[j] = v;
1888  s->chroma_intra_matrix[j] = v;
1889 
1891  s->inter_matrix[j] = v;
1892  s->chroma_inter_matrix[j] = v;
1893  }
1894 
1895  /* load custom intra matrix */
1896  if (get_bits1(gb)) {
1897  int last = 0;
1898  for (i = 0; i < 64; i++) {
1899  int j;
1900  if (get_bits_left(gb) < 8) {
1901  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1902  return AVERROR_INVALIDDATA;
1903  }
1904  v = get_bits(gb, 8);
1905  if (v == 0)
1906  break;
1907 
1908  last = v;
1909  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1910  s->intra_matrix[j] = last;
1911  s->chroma_intra_matrix[j] = last;
1912  }
1913 
1914  /* replicate last value */
1915  for (; i < 64; i++) {
1916  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1917  s->intra_matrix[j] = last;
1918  s->chroma_intra_matrix[j] = last;
1919  }
1920  }
1921 
1922  /* load custom non intra matrix */
1923  if (get_bits1(gb)) {
1924  int last = 0;
1925  for (i = 0; i < 64; i++) {
1926  int j;
1927  if (get_bits_left(gb) < 8) {
1928  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1929  return AVERROR_INVALIDDATA;
1930  }
1931  v = get_bits(gb, 8);
1932  if (v == 0)
1933  break;
1934 
1935  last = v;
1936  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1937  s->inter_matrix[j] = v;
1938  s->chroma_inter_matrix[j] = v;
1939  }
1940 
1941  /* replicate last value */
1942  for (; i < 64; i++) {
1943  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1944  s->inter_matrix[j] = last;
1945  s->chroma_inter_matrix[j] = last;
1946  }
1947  }
1948 
1949  // FIXME a bunch of grayscale shape things
1950  }
1951 
1952  if (vo_ver_id != 1)
1953  s->quarter_sample = get_bits1(gb);
1954  else
1955  s->quarter_sample = 0;
1956 
1957  if (get_bits_left(gb) < 4) {
1958  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1959  return AVERROR_INVALIDDATA;
1960  }
1961 
1962  if (!get_bits1(gb)) {
1963  int pos = get_bits_count(gb);
1964  int estimation_method = get_bits(gb, 2);
1965  if (estimation_method < 2) {
1966  if (!get_bits1(gb)) {
1967  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1968  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1969  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1970  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1971  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1972  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
1973  }
1974  if (!get_bits1(gb)) {
1975  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1976  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1977  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1978  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1979  }
1980  if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
1981  skip_bits_long(gb, pos - get_bits_count(gb));
1982  goto no_cplx_est;
1983  }
1984  if (!get_bits1(gb)) {
1985  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1986  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1987  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1988  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1989  }
1990  if (!get_bits1(gb)) {
1991  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1992  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1993  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1994  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1995  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1996  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1997  }
1998  if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
1999  skip_bits_long(gb, pos - get_bits_count(gb));
2000  goto no_cplx_est;
2001  }
2002  if (estimation_method == 1) {
2003  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2004  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2005  }
2006  } else
2007  av_log(s->avctx, AV_LOG_ERROR,
2008  "Invalid Complexity estimation method %d\n",
2009  estimation_method);
2010  } else {
2011 
2012 no_cplx_est:
2013  ctx->cplx_estimation_trash_i =
2014  ctx->cplx_estimation_trash_p =
2015  ctx->cplx_estimation_trash_b = 0;
2016  }
2017 
2018  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2019 
2020  s->data_partitioning = get_bits1(gb);
2021  if (s->data_partitioning)
2022  ctx->rvlc = get_bits1(gb);
2023 
2024  if (vo_ver_id != 1) {
2025  ctx->new_pred = get_bits1(gb);
2026  if (ctx->new_pred) {
2027  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2028  skip_bits(gb, 2); /* requested upstream message type */
2029  skip_bits1(gb); /* newpred segment type */
2030  }
2031  if (get_bits1(gb)) // reduced_res_vop
2032  av_log(s->avctx, AV_LOG_ERROR,
2033  "reduced resolution VOP not supported\n");
2034  } else {
2035  ctx->new_pred = 0;
2036  }
2037 
2038  ctx->scalability = get_bits1(gb);
2039 
2040  if (ctx->scalability) {
2041  GetBitContext bak = *gb;
2042  int h_sampling_factor_n;
2043  int h_sampling_factor_m;
2044  int v_sampling_factor_n;
2045  int v_sampling_factor_m;
2046 
2047  skip_bits1(gb); // hierarchy_type
2048  skip_bits(gb, 4); /* ref_layer_id */
2049  skip_bits1(gb); /* ref_layer_sampling_dir */
2050  h_sampling_factor_n = get_bits(gb, 5);
2051  h_sampling_factor_m = get_bits(gb, 5);
2052  v_sampling_factor_n = get_bits(gb, 5);
2053  v_sampling_factor_m = get_bits(gb, 5);
2054  ctx->enhancement_type = get_bits1(gb);
2055 
2056  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2057  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2058  /* illegal scalability header (VERY broken encoder),
2059  * trying to workaround */
2060  ctx->scalability = 0;
2061  *gb = bak;
2062  } else
2063  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2064 
2065  // bin shape stuff FIXME
2066  }
2067  }
2068 
2069  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2070  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",
2071  s->avctx->framerate.den, s->avctx->framerate.num,
2072  ctx->time_increment_bits,
2073  s->quant_precision,
2074  s->progressive_sequence,
2075  s->low_delay,
2076  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2077  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2078  );
2079  }
2080 
2081  return 0;
2082 }
2083 
2084 /**
2085  * Decode the user data stuff in the header.
2086  * Also initializes divx/xvid/lavc_version/build.
2087  */
2089 {
2090  MpegEncContext *s = &ctx->m;
2091  char buf[256];
2092  int i;
2093  int e;
2094  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2095  char last;
2096 
2097  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2098  if (show_bits(gb, 23) == 0)
2099  break;
2100  buf[i] = get_bits(gb, 8);
2101  }
2102  buf[i] = 0;
2103 
2104  /* divx detection */
2105  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2106  if (e < 2)
2107  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2108  if (e >= 2) {
2109  ctx->divx_version = ver;
2110  ctx->divx_build = build;
2111  s->divx_packed = e == 3 && last == 'p';
2112  }
2113 
2114  /* libavcodec detection */
2115  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2116  if (e != 4)
2117  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2118  if (e != 4) {
2119  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2120  if (e > 1)
2121  build = (ver << 16) + (ver2 << 8) + ver3;
2122  }
2123  if (e != 4) {
2124  if (strcmp(buf, "ffmpeg") == 0)
2125  ctx->lavc_build = 4600;
2126  }
2127  if (e == 4)
2128  ctx->lavc_build = build;
2129 
2130  /* Xvid detection */
2131  e = sscanf(buf, "XviD%d", &build);
2132  if (e == 1)
2133  ctx->xvid_build = build;
2134 
2135  return 0;
2136 }
2137 
2139 {
2140  Mpeg4DecContext *ctx = avctx->priv_data;
2141  MpegEncContext *s = &ctx->m;
2142 
2143  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2144  if (s->codec_tag == AV_RL32("XVID") ||
2145  s->codec_tag == AV_RL32("XVIX") ||
2146  s->codec_tag == AV_RL32("RMP4") ||
2147  s->codec_tag == AV_RL32("ZMP4") ||
2148  s->codec_tag == AV_RL32("SIPP"))
2149  ctx->xvid_build = 0;
2150  }
2151 
2152  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2153  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2154  ctx->vol_control_parameters == 0)
2155  ctx->divx_version = 400; // divx 4
2156 
2157  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2158  ctx->divx_version =
2159  ctx->divx_build = -1;
2160  }
2161 
2163  if (s->codec_tag == AV_RL32("XVIX"))
2165 
2166  if (s->codec_tag == AV_RL32("UMP4"))
2168 
2169  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2171 
2172  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2174 
2175  if (ctx->xvid_build <= 3U)
2176  s->padding_bug_score = 256 * 256 * 256 * 64;
2177 
2178  if (ctx->xvid_build <= 1U)
2180 
2181  if (ctx->xvid_build <= 12U)
2183 
2184  if (ctx->xvid_build <= 32U)
2186 
2187 #define SET_QPEL_FUNC(postfix1, postfix2) \
2188  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2189  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2190  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2191 
2192  if (ctx->lavc_build < 4653U)
2194 
2195  if (ctx->lavc_build < 4655U)
2197 
2198  if (ctx->lavc_build < 4670U)
2200 
2201  if (ctx->lavc_build <= 4712U)
2203 
2204  if ((ctx->lavc_build&0xFF) >= 100) {
2205  if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2206  (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2207  )
2209  }
2210 
2211  if (ctx->divx_version >= 0)
2213  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2214  s->padding_bug_score = 256 * 256 * 256 * 64;
2215 
2216  if (ctx->divx_version < 500U)
2218 
2219  if (ctx->divx_version >= 0)
2221  }
2222 
2223  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2224  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2225  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2226  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2227  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2228  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2229  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2230 
2231  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2232  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2233  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2234  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2235  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2236  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2237  }
2238 
2239  if (avctx->debug & FF_DEBUG_BUGS)
2241  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2242  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2243  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2244 
2245  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2246  s->codec_id == AV_CODEC_ID_MPEG4 &&
2247  avctx->idct_algo == FF_IDCT_AUTO) {
2248  avctx->idct_algo = FF_IDCT_XVID;
2249  ff_mpv_idct_init(s);
2250  return 1;
2251  }
2252 
2253  return 0;
2254 }
2255 
2257 {
2258  MpegEncContext *s = &ctx->m;
2259  int time_incr, time_increment;
2260  int64_t pts;
2261 
2262  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2263  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2265  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2266  s->low_delay = 0;
2267  }
2268 
2270  if (s->partitioned_frame)
2272  else
2274 
2275  time_incr = 0;
2276  while (get_bits1(gb) != 0)
2277  time_incr++;
2278 
2279  check_marker(s->avctx, gb, "before time_increment");
2280 
2281  if (ctx->time_increment_bits == 0 ||
2282  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2284  "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);
2285 
2286  for (ctx->time_increment_bits = 1;
2287  ctx->time_increment_bits < 16;
2288  ctx->time_increment_bits++) {
2289  if (s->pict_type == AV_PICTURE_TYPE_P ||
2290  (s->pict_type == AV_PICTURE_TYPE_S &&
2291  ctx->vol_sprite_usage == GMC_SPRITE)) {
2292  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2293  break;
2294  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2295  break;
2296  }
2297 
2299  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2300  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2301  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2303  }
2304  }
2305 
2306  if (IS_3IV1)
2307  time_increment = get_bits1(gb); // FIXME investigate further
2308  else
2309  time_increment = get_bits(gb, ctx->time_increment_bits);
2310 
2311  if (s->pict_type != AV_PICTURE_TYPE_B) {
2312  s->last_time_base = s->time_base;
2313  s->time_base += time_incr;
2314  s->time = s->time_base * s->avctx->framerate.num + time_increment;
2315  if (s->workaround_bugs & FF_BUG_UMP4) {
2316  if (s->time < s->last_non_b_time) {
2317  /* header is not mpeg-4-compatible, broken encoder,
2318  * trying to workaround */
2319  s->time_base++;
2320  s->time += s->avctx->framerate.num;
2321  }
2322  }
2323  s->pp_time = s->time - s->last_non_b_time;
2324  s->last_non_b_time = s->time;
2325  } else {
2326  s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2327  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2328  if (s->pp_time <= s->pb_time ||
2329  s->pp_time <= s->pp_time - s->pb_time ||
2330  s->pp_time <= 0) {
2331  /* messed up order, maybe after seeking? skipping current B-frame */
2332  return FRAME_SKIPPED;
2333  }
2335 
2336  if (ctx->t_frame == 0)
2337  ctx->t_frame = s->pb_time;
2338  if (ctx->t_frame == 0)
2339  ctx->t_frame = 1; // 1/0 protection
2340  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2341  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2342  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2343  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2344  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2345  s->pb_field_time = 2;
2346  s->pp_field_time = 4;
2347  if (!s->progressive_sequence)
2348  return FRAME_SKIPPED;
2349  }
2350  }
2351 
2352  if (s->avctx->framerate.den)
2353  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2354  else
2355  pts = AV_NOPTS_VALUE;
2356  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2357 
2358  check_marker(s->avctx, gb, "before vop_coded");
2359 
2360  /* vop coded */
2361  if (get_bits1(gb) != 1) {
2362  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2363  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2364  return FRAME_SKIPPED;
2365  }
2366  if (ctx->new_pred)
2367  decode_new_pred(ctx, gb);
2368 
2369  if (ctx->shape != BIN_ONLY_SHAPE &&
2370  (s->pict_type == AV_PICTURE_TYPE_P ||
2371  (s->pict_type == AV_PICTURE_TYPE_S &&
2372  ctx->vol_sprite_usage == GMC_SPRITE))) {
2373  /* rounding type for motion estimation */
2374  s->no_rounding = get_bits1(gb);
2375  } else {
2376  s->no_rounding = 0;
2377  }
2378  // FIXME reduced res stuff
2379 
2380  if (ctx->shape != RECT_SHAPE) {
2381  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2382  skip_bits(gb, 13); /* width */
2383  check_marker(s->avctx, gb, "after width");
2384  skip_bits(gb, 13); /* height */
2385  check_marker(s->avctx, gb, "after height");
2386  skip_bits(gb, 13); /* hor_spat_ref */
2387  check_marker(s->avctx, gb, "after hor_spat_ref");
2388  skip_bits(gb, 13); /* ver_spat_ref */
2389  }
2390  skip_bits1(gb); /* change_CR_disable */
2391 
2392  if (get_bits1(gb) != 0)
2393  skip_bits(gb, 8); /* constant_alpha_value */
2394  }
2395 
2396  // FIXME complexity estimation stuff
2397 
2398  if (ctx->shape != BIN_ONLY_SHAPE) {
2399  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2400  if (s->pict_type != AV_PICTURE_TYPE_I)
2401  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2402  if (s->pict_type == AV_PICTURE_TYPE_B)
2403  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2404 
2405  if (get_bits_left(gb) < 3) {
2406  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2407  return AVERROR_INVALIDDATA;
2408  }
2409  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2410  if (!s->progressive_sequence) {
2411  s->top_field_first = get_bits1(gb);
2412  s->alternate_scan = get_bits1(gb);
2413  } else
2414  s->alternate_scan = 0;
2415  }
2416 
2417  if (s->alternate_scan) {
2418  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2419  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2420  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2421  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2422  } else {
2423  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2424  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2425  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2426  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2427  }
2428 
2429  if (s->pict_type == AV_PICTURE_TYPE_S &&
2430  (ctx->vol_sprite_usage == STATIC_SPRITE ||
2431  ctx->vol_sprite_usage == GMC_SPRITE)) {
2432  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2433  return AVERROR_INVALIDDATA;
2434  if (ctx->sprite_brightness_change)
2435  av_log(s->avctx, AV_LOG_ERROR,
2436  "sprite_brightness_change not supported\n");
2437  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2438  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2439  }
2440 
2441  if (ctx->shape != BIN_ONLY_SHAPE) {
2442  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2443  if (s->qscale == 0) {
2444  av_log(s->avctx, AV_LOG_ERROR,
2445  "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2446  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2447  }
2448 
2449  if (s->pict_type != AV_PICTURE_TYPE_I) {
2450  s->f_code = get_bits(gb, 3); /* fcode_for */
2451  if (s->f_code == 0) {
2452  av_log(s->avctx, AV_LOG_ERROR,
2453  "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2454  s->f_code = 1;
2455  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2456  }
2457  } else
2458  s->f_code = 1;
2459 
2460  if (s->pict_type == AV_PICTURE_TYPE_B) {
2461  s->b_code = get_bits(gb, 3);
2462  if (s->b_code == 0) {
2463  av_log(s->avctx, AV_LOG_ERROR,
2464  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2465  s->b_code=1;
2466  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2467  }
2468  } else
2469  s->b_code = 1;
2470 
2471  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2472  av_log(s->avctx, AV_LOG_DEBUG,
2473  "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",
2474  s->qscale, s->f_code, s->b_code,
2475  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")),
2476  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2477  s->top_field_first, s->quarter_sample ? "q" : "h",
2478  s->data_partitioning, ctx->resync_marker,
2479  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2480  1 - s->no_rounding, s->vo_type,
2481  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2482  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2483  ctx->cplx_estimation_trash_b,
2484  s->time,
2485  time_increment
2486  );
2487  }
2488 
2489  if (!ctx->scalability) {
2490  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2491  skip_bits1(gb); // vop shape coding type
2492  } else {
2493  if (ctx->enhancement_type) {
2494  int load_backward_shape = get_bits1(gb);
2495  if (load_backward_shape)
2496  av_log(s->avctx, AV_LOG_ERROR,
2497  "load backward shape isn't supported\n");
2498  }
2499  skip_bits(gb, 2); // ref_select_code
2500  }
2501  }
2502  /* detect buggy encoders which don't set the low_delay flag
2503  * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2504  * easily (although it's buggy too) */
2505  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2506  ctx->divx_version == -1 && s->picture_number == 0) {
2507  av_log(s->avctx, AV_LOG_WARNING,
2508  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2509  s->low_delay = 1;
2510  }
2511 
2512  s->picture_number++; // better than pic number==0 always ;)
2513 
2514  // FIXME add short header support
2515  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2516  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2517 
2518  if (s->workaround_bugs & FF_BUG_EDGE) {
2519  s->h_edge_pos = s->width;
2520  s->v_edge_pos = s->height;
2521  }
2522  return 0;
2523 }
2524 
2525 /**
2526  * Decode MPEG-4 headers.
2527  * @return <0 if no VOP found (or a damaged one)
2528  * FRAME_SKIPPED if a not coded VOP is found
2529  * 0 if a VOP is found
2530  */
2532 {
2533  MpegEncContext *s = &ctx->m;
2534  unsigned startcode, v;
2535  int ret;
2536 
2537  /* search next start code */
2538  align_get_bits(gb);
2539 
2540  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2541  skip_bits(gb, 24);
2542  if (get_bits(gb, 8) == 0xF0)
2543  goto end;
2544  }
2545 
2546  startcode = 0xff;
2547  for (;;) {
2548  if (get_bits_count(gb) >= gb->size_in_bits) {
2549  if (gb->size_in_bits == 8 &&
2550  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2551  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2552  return FRAME_SKIPPED; // divx bug
2553  } else
2554  return -1; // end of stream
2555  }
2556 
2557  /* use the bits after the test */
2558  v = get_bits(gb, 8);
2559  startcode = ((startcode << 8) | v) & 0xffffffff;
2560 
2561  if ((startcode & 0xFFFFFF00) != 0x100)
2562  continue; // no startcode
2563 
2564  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2565  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2566  if (startcode <= 0x11F)
2567  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2568  else if (startcode <= 0x12F)
2569  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2570  else if (startcode <= 0x13F)
2571  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2572  else if (startcode <= 0x15F)
2573  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2574  else if (startcode <= 0x1AF)
2575  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2576  else if (startcode == 0x1B0)
2577  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2578  else if (startcode == 0x1B1)
2579  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2580  else if (startcode == 0x1B2)
2581  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2582  else if (startcode == 0x1B3)
2583  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2584  else if (startcode == 0x1B4)
2585  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2586  else if (startcode == 0x1B5)
2587  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2588  else if (startcode == 0x1B6)
2589  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2590  else if (startcode == 0x1B7)
2591  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2592  else if (startcode == 0x1B8)
2593  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2594  else if (startcode == 0x1B9)
2595  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2596  else if (startcode == 0x1BA)
2597  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2598  else if (startcode == 0x1BB)
2599  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2600  else if (startcode == 0x1BC)
2601  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2602  else if (startcode == 0x1BD)
2603  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2604  else if (startcode == 0x1BE)
2605  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2606  else if (startcode == 0x1BF)
2607  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2608  else if (startcode == 0x1C0)
2609  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2610  else if (startcode == 0x1C1)
2611  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2612  else if (startcode == 0x1C2)
2613  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2614  else if (startcode == 0x1C3)
2615  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2616  else if (startcode <= 0x1C5)
2617  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2618  else if (startcode <= 0x1FF)
2619  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2620  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2621  }
2622 
2623  if (startcode >= 0x120 && startcode <= 0x12F) {
2624  if ((ret = decode_vol_header(ctx, gb)) < 0)
2625  return ret;
2626  } else if (startcode == USER_DATA_STARTCODE) {
2627  decode_user_data(ctx, gb);
2628  } else if (startcode == GOP_STARTCODE) {
2629  mpeg4_decode_gop_header(s, gb);
2630  } else if (startcode == VOS_STARTCODE) {
2632  } else if (startcode == VOP_STARTCODE) {
2633  break;
2634  }
2635 
2636  align_get_bits(gb);
2637  startcode = 0xff;
2638  }
2639 
2640 end:
2642  s->low_delay = 1;
2643  s->avctx->has_b_frames = !s->low_delay;
2644 
2645  return decode_vop_header(ctx, gb);
2646 }
2647 
2649  static int done = 0;
2650 
2651  if (!done) {
2658  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2659  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2660  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2661  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2662  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2663  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2664  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2665  &ff_sprite_trajectory_tab[0][1], 4, 2,
2666  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2667  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2668  &ff_mb_type_b_tab[0][1], 2, 1,
2669  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2670  done = 1;
2671  }
2672 }
2673 
2674 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2675 {
2676  Mpeg4DecContext *ctx = avctx->priv_data;
2677  MpegEncContext *s = &ctx->m;
2678 
2679  /* divx 5.01+ bitstream reorder stuff */
2680  /* Since this clobbers the input buffer and hwaccel codecs still need the
2681  * data during hwaccel->end_frame we should not do this any earlier */
2682  if (s->divx_packed) {
2683  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2684  int startcode_found = 0;
2685 
2686  if (buf_size - current_pos > 7) {
2687 
2688  int i;
2689  for (i = current_pos; i < buf_size - 4; i++)
2690 
2691  if (buf[i] == 0 &&
2692  buf[i + 1] == 0 &&
2693  buf[i + 2] == 1 &&
2694  buf[i + 3] == 0xB6) {
2695  startcode_found = !(buf[i + 4] & 0x40);
2696  break;
2697  }
2698  }
2699 
2700  if (startcode_found) {
2701  if (!ctx->showed_packed_warning) {
2702  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2703  "wasteful way to store B-frames ('packed B-frames'). "
2704  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2705  ctx->showed_packed_warning = 1;
2706  }
2709  buf_size - current_pos);
2710  if (!s->bitstream_buffer) {
2711  s->bitstream_buffer_size = 0;
2712  return AVERROR(ENOMEM);
2713  }
2714  memcpy(s->bitstream_buffer, buf + current_pos,
2715  buf_size - current_pos);
2716  s->bitstream_buffer_size = buf_size - current_pos;
2717  }
2718  }
2719 
2720  return 0;
2721 }
2722 
2723 #if HAVE_THREADS
2724 static int mpeg4_update_thread_context(AVCodecContext *dst,
2725  const AVCodecContext *src)
2726 {
2727  Mpeg4DecContext *s = dst->priv_data;
2728  const Mpeg4DecContext *s1 = src->priv_data;
2729  int init = s->m.context_initialized;
2730 
2731  int ret = ff_mpeg_update_thread_context(dst, src);
2732 
2733  if (ret < 0)
2734  return ret;
2735 
2736  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2737 
2738  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2739  ff_xvid_idct_init(&s->m.idsp, dst);
2740 
2741  return 0;
2742 }
2743 #endif
2744 
2746 {
2747  Mpeg4DecContext *ctx = avctx->priv_data;
2748  MpegEncContext *s = &ctx->m;
2749  int ret;
2750 
2751  ctx->divx_version =
2752  ctx->divx_build =
2753  ctx->xvid_build =
2754  ctx->lavc_build = -1;
2755 
2756  if ((ret = ff_h263_decode_init(avctx)) < 0)
2757  return ret;
2758 
2760 
2761  s->h263_pred = 1;
2762  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2764  ctx->time_increment_bits = 4; /* default value for broken headers */
2765 
2767  avctx->internal->allocate_progress = 1;
2768 
2769  return 0;
2770 }
2771 
2772 static const AVOption mpeg4_options[] = {
2773  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2774  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2775  {NULL}
2776 };
2777 
2778 static const AVClass mpeg4_class = {
2779  "MPEG4 Video Decoder",
2781  mpeg4_options,
2783 };
2784 
2786  .name = "mpeg4",
2787  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2788  .type = AVMEDIA_TYPE_VIDEO,
2789  .id = AV_CODEC_ID_MPEG4,
2790  .priv_data_size = sizeof(Mpeg4DecContext),
2791  .init = decode_init,
2792  .close = ff_h263_decode_end,
2797  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2798  .flush = ff_mpeg_flush,
2799  .max_lowres = 3,
2802  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2803  .priv_class = &mpeg4_class,
2804 };
2805 
2806 
2807 #if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
2808 static const AVClass mpeg4_vdpau_class = {
2809  "MPEG4 Video VDPAU Decoder",
2811  mpeg4_options,
2813 };
2814 
2815 AVCodec ff_mpeg4_vdpau_decoder = {
2816  .name = "mpeg4_vdpau",
2817  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2818  .type = AVMEDIA_TYPE_VIDEO,
2819  .id = AV_CODEC_ID_MPEG4,
2820  .priv_data_size = sizeof(Mpeg4DecContext),
2821  .init = decode_init,
2822  .close = ff_h263_decode_end,
2826  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2827  AV_PIX_FMT_NONE },
2828  .priv_class = &mpeg4_vdpau_class,
2829 };
2830 #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:397
uint16_t sprite_traj[4][2]
sprite trajectory points
Definition: mpeg4video.h:75
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2995
#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:3390
#define MB_TYPE_SKIP
Definition: avcodec.h:1272
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:2879
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:504
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h: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:75
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
int16_t(*[3] ac_val)[16]
used for MPEG-4 AC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:191
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:167
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:407
int num
Numerator.
Definition: rational.h:59
uint8_t * bitstream_buffer
Definition: mpegvideo.h:413
enum AVCodecID codec_id
Definition: mpegvideo.h:109
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2994
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2891
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:2101
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:2988
mpegvideo header.
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1895
#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:501
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:3196
AVCodec.
Definition: avcodec.h:3645
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:307
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:1827
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:992
#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
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (MPEG-4) ...
Definition: mpegvideo.h: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:2932
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:886
#define FF_BUG_EDGE
Definition: avcodec.h:2890
int interlaced_dct
Definition: mpegvideo.h:481
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:177
#define CHROMA_420
Definition: mpegvideo.h:473
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:2888
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2887
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:1003
#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:2434
#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:2895
#define av_log(a,...)
#define MOTION_MARKER
Definition: mpeg4video.h:53
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:731
#define FF_IDCT_AUTO
Definition: avcodec.h:3051
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:2889
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:587
#define FF_IDCT_XVID
Definition: avcodec.h:3064
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:2012
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:180
ERContext er
Definition: mpegvideo.h:551
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:1785
#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:2881
#define FF_DEBUG_BUGS
Definition: avcodec.h:2951
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:3652
#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:446
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:500
#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:1030
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
Definition: get_bits.h:509
Definition: vlc.h:26
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c: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:219
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:1271
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:961
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:2979
#define MB_TYPE_DIRECT2
Definition: avcodec.h:1269
#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:3050
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
#define MB_TYPE_INTERLACED
Definition: avcodec.h:1268
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:296
#define MB_TYPE_L0L1
Definition: avcodec.h:1279
#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:3294
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:181
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:554
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:83
int n
Definition: avisynth_c.h:684
#define MB_TYPE_ACPRED
Definition: avcodec.h:1270
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:1836
#define MB_TYPE_L1
Definition: avcodec.h:1278
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:2886
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:2880
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:293
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:434
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:2931
main external API structure.
Definition: avcodec.h:1690
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
#define FASTDIV(a, b)
Definition: mathops.h:212
#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:503
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:454
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:313
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:338
Describe the class of an AVClass context structure.
Definition: log.h:67
ScanTable intra_h_scantable
Definition: mpegvideo.h:89
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:306
static const AVProfile profiles[]
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:196
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode MPEG-4 headers.
int context_initialized
Definition: mpegvideo.h:121
#define GET_CACHE(name, gb)
Definition: get_bits.h:197
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2992
#define MB_TYPE_16x16
Definition: avcodec.h:1264
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:346
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:77
#define MV_DIR_FORWARD
Definition: mpegvideo.h: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:968
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2875
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:2882
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 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:60
#define TEX_VLC_BITS
Definition: dv.h:93
static VLC dc_chrom
Definition: mpeg4videodec.c:47
#define MB_TYPE_8x8
Definition: avcodec.h:1267
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:1265
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:1732
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:2945
#define IS_8X8(a)
Definition: mpegutils.h:91
int len
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1740
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:498
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:464
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
int chroma_qscale
chroma QP
Definition: mpegvideo.h:202
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:255
#define av_uninit(x)
Definition: attributes.h:148
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:69
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:116
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:2892
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:967
for(j=16;j >0;--j)
#define MB_TYPE_L0
Definition: avcodec.h:1277
#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