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mpeg4videodec.c
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1 /*
2  * MPEG4 decoder.
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define UNCHECKED_BITSTREAM_READER 1
24 
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "error_resilience.h"
28 #include "idctdsp.h"
29 #include "internal.h"
30 #include "mpegutils.h"
31 #include "mpegvideo.h"
32 #include "mpegvideodata.h"
33 #include "mpeg4video.h"
34 #include "h263.h"
35 #include "thread.h"
36 #include "xvididct.h"
37 
38 /* The defines below define the number of bits that are read at once for
39  * reading vlc values. Changing these may improve speed and data cache needs
40  * be aware though that decreasing them may need the number of stages that is
41  * passed to get_vlc* to be increased. */
42 #define SPRITE_TRAJ_VLC_BITS 6
43 #define DC_VLC_BITS 9
44 #define MB_TYPE_B_VLC_BITS 4
45 
46 static VLC dc_lum, dc_chrom;
47 static VLC sprite_trajectory;
48 static VLC mb_type_b_vlc;
49 
50 static const int mb_type_b_map[4] = {
51  MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
52  MB_TYPE_L0L1 | MB_TYPE_16x16,
53  MB_TYPE_L1 | MB_TYPE_16x16,
54  MB_TYPE_L0 | MB_TYPE_16x16,
55 };
56 
57 /**
58  * Predict the ac.
59  * @param n block index (0-3 are luma, 4-5 are chroma)
60  * @param dir the ac prediction direction
61  */
62 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
63 {
64  int i;
65  int16_t *ac_val, *ac_val1;
66  int8_t *const qscale_table = s->current_picture.qscale_table;
67 
68  /* find prediction */
69  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
70  ac_val1 = ac_val;
71  if (s->ac_pred) {
72  if (dir == 0) {
73  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
74  /* left prediction */
75  ac_val -= 16;
76 
77  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
78  n == 1 || n == 3) {
79  /* same qscale */
80  for (i = 1; i < 8; i++)
81  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
82  } else {
83  /* different qscale, we must rescale */
84  for (i = 1; i < 8; i++)
85  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
86  }
87  } else {
88  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
89  /* top prediction */
90  ac_val -= 16 * s->block_wrap[n];
91 
92  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
93  n == 2 || n == 3) {
94  /* same qscale */
95  for (i = 1; i < 8; i++)
96  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
97  } else {
98  /* different qscale, we must rescale */
99  for (i = 1; i < 8; i++)
100  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
101  }
102  }
103  }
104  /* left copy */
105  for (i = 1; i < 8; i++)
106  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
107 
108  /* top copy */
109  for (i = 1; i < 8; i++)
110  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
111 }
112 
113 /**
114  * check if the next stuff is a resync marker or the end.
115  * @return 0 if not
116  */
117 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
118 {
119  MpegEncContext *s = &ctx->m;
120  int bits_count = get_bits_count(&s->gb);
121  int v = show_bits(&s->gb, 16);
122 
123  if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
124  return 0;
125 
126  while (v <= 0xFF) {
127  if (s->pict_type == AV_PICTURE_TYPE_B ||
128  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
129  break;
130  skip_bits(&s->gb, 8 + s->pict_type);
131  bits_count += 8 + s->pict_type;
132  v = show_bits(&s->gb, 16);
133  }
134 
135  if (bits_count + 8 >= s->gb.size_in_bits) {
136  v >>= 8;
137  v |= 0x7F >> (7 - (bits_count & 7));
138 
139  if (v == 0x7F)
140  return s->mb_num;
141  } else {
142  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
143  int len, mb_num;
144  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
145  GetBitContext gb = s->gb;
146 
147  skip_bits(&s->gb, 1);
148  align_get_bits(&s->gb);
149 
150  for (len = 0; len < 32; len++)
151  if (get_bits1(&s->gb))
152  break;
153 
154  mb_num = get_bits(&s->gb, mb_num_bits);
155  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
156  mb_num= -1;
157 
158  s->gb = gb;
159 
160  if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
161  return mb_num;
162  }
163  }
164  return 0;
165 }
166 
167 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
168 {
169  MpegEncContext *s = &ctx->m;
170  int a = 2 << s->sprite_warping_accuracy;
171  int rho = 3 - s->sprite_warping_accuracy;
172  int r = 16 / a;
173  int alpha = 0;
174  int beta = 0;
175  int w = s->width;
176  int h = s->height;
177  int min_ab, i, w2, h2, w3, h3;
178  int sprite_ref[4][2];
179  int virtual_ref[2][2];
180 
181  // only true for rectangle shapes
182  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
183  { 0, s->height }, { s->width, s->height } };
184  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
185 
186  if (w <= 0 || h <= 0)
187  return AVERROR_INVALIDDATA;
188 
189  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
190  int length;
191  int x = 0, y = 0;
192 
193  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
194  if (length > 0)
195  x = get_xbits(gb, length);
196 
197  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
198  check_marker(gb, "before sprite_trajectory");
199 
200  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
201  if (length > 0)
202  y = get_xbits(gb, length);
203 
204  check_marker(gb, "after sprite_trajectory");
205  ctx->sprite_traj[i][0] = d[i][0] = x;
206  ctx->sprite_traj[i][1] = d[i][1] = y;
207  }
208  for (; i < 4; i++)
209  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
210 
211  while ((1 << alpha) < w)
212  alpha++;
213  while ((1 << beta) < h)
214  beta++; /* typo in the mpeg4 std for the definition of w' and h' */
215  w2 = 1 << alpha;
216  h2 = 1 << beta;
217 
218  // Note, the 4th point isn't used for GMC
219  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
220  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
221  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
222  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
223  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
224  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
225  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
226  } else {
227  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
228  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
229  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
230  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
231  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
232  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
233  }
234  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
235  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
236 
237  /* this is mostly identical to the mpeg4 std (and is totally unreadable
238  * because of that...). Perhaps it should be reordered to be more readable.
239  * The idea behind this virtual_ref mess is to be able to use shifts later
240  * per pixel instead of divides so the distance between points is converted
241  * from w&h based to w2&h2 based which are of the 2^x form. */
242  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
243  ROUNDED_DIV(((w - w2) *
244  (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
245  w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
246  virtual_ref[0][1] = 16 * vop_ref[0][1] +
247  ROUNDED_DIV(((w - w2) *
248  (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
249  w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
250  virtual_ref[1][0] = 16 * vop_ref[0][0] +
251  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
252  h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
253  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
254  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
255  h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
256 
257  switch (ctx->num_sprite_warping_points) {
258  case 0:
259  s->sprite_offset[0][0] =
260  s->sprite_offset[0][1] =
261  s->sprite_offset[1][0] =
262  s->sprite_offset[1][1] = 0;
263  s->sprite_delta[0][0] = a;
264  s->sprite_delta[0][1] =
265  s->sprite_delta[1][0] = 0;
266  s->sprite_delta[1][1] = a;
267  ctx->sprite_shift[0] =
268  ctx->sprite_shift[1] = 0;
269  break;
270  case 1: // GMC only
271  s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
272  s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
273  s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
274  a * (vop_ref[0][0] / 2);
275  s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
276  a * (vop_ref[0][1] / 2);
277  s->sprite_delta[0][0] = a;
278  s->sprite_delta[0][1] =
279  s->sprite_delta[1][0] = 0;
280  s->sprite_delta[1][1] = a;
281  ctx->sprite_shift[0] =
282  ctx->sprite_shift[1] = 0;
283  break;
284  case 2:
285  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
286  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
287  (-vop_ref[0][0]) +
288  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
289  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
290  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
291  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
292  (-vop_ref[0][0]) +
293  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
294  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
295  s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
296  (-2 * vop_ref[0][0] + 1) +
297  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
298  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
299  sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
300  s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
301  (-2 * vop_ref[0][0] + 1) +
302  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
303  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
304  sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
305  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
306  s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
307  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
308  s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
309 
310  ctx->sprite_shift[0] = alpha + rho;
311  ctx->sprite_shift[1] = alpha + rho + 2;
312  break;
313  case 3:
314  min_ab = FFMIN(alpha, beta);
315  w3 = w2 >> min_ab;
316  h3 = h2 >> min_ab;
317  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
318  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
319  h3 * (-vop_ref[0][0]) +
320  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
321  w3 * (-vop_ref[0][1]) +
322  (1 << (alpha + beta + rho - min_ab - 1));
323  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
324  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
325  h3 * (-vop_ref[0][0]) +
326  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
327  w3 * (-vop_ref[0][1]) +
328  (1 << (alpha + beta + rho - min_ab - 1));
329  s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
330  h3 * (-2 * vop_ref[0][0] + 1) +
331  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
332  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
333  r * sprite_ref[0][0] - 16 * w2 * h3 +
334  (1 << (alpha + beta + rho - min_ab + 1));
335  s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
336  h3 * (-2 * vop_ref[0][0] + 1) +
337  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
338  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
339  r * sprite_ref[0][1] - 16 * w2 * h3 +
340  (1 << (alpha + beta + rho - min_ab + 1));
341  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
342  s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
343  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
344  s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
345 
346  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
347  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
348  break;
349  }
350  /* try to simplify the situation */
351  if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
352  s->sprite_delta[0][1] == 0 &&
353  s->sprite_delta[1][0] == 0 &&
354  s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
355  s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
356  s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
357  s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
358  s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
359  s->sprite_delta[0][0] = a;
360  s->sprite_delta[0][1] = 0;
361  s->sprite_delta[1][0] = 0;
362  s->sprite_delta[1][1] = a;
363  ctx->sprite_shift[0] = 0;
364  ctx->sprite_shift[1] = 0;
365  s->real_sprite_warping_points = 1;
366  } else {
367  int shift_y = 16 - ctx->sprite_shift[0];
368  int shift_c = 16 - ctx->sprite_shift[1];
369  for (i = 0; i < 2; i++) {
370  s->sprite_offset[0][i] <<= shift_y;
371  s->sprite_offset[1][i] <<= shift_c;
372  s->sprite_delta[0][i] <<= shift_y;
373  s->sprite_delta[1][i] <<= shift_y;
374  ctx->sprite_shift[i] = 16;
375  }
376  s->real_sprite_warping_points = ctx->num_sprite_warping_points;
377  }
378 
379  return 0;
380 }
381 
382 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
383  int len = FFMIN(ctx->time_increment_bits + 3, 15);
384 
385  get_bits(gb, len);
386  if (get_bits1(gb))
387  get_bits(gb, len);
388  check_marker(gb, "after new_pred");
389 
390  return 0;
391 }
392 
393 /**
394  * Decode the next video packet.
395  * @return <0 if something went wrong
396  */
397 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
398 {
399  MpegEncContext *s = &ctx->m;
400 
401  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
402  int header_extension = 0, mb_num, len;
403 
404  /* is there enough space left for a video packet + header */
405  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
406  return -1;
407 
408  for (len = 0; len < 32; len++)
409  if (get_bits1(&s->gb))
410  break;
411 
412  if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
413  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
414  return -1;
415  }
416 
417  if (ctx->shape != RECT_SHAPE) {
418  header_extension = get_bits1(&s->gb);
419  // FIXME more stuff here
420  }
421 
422  mb_num = get_bits(&s->gb, mb_num_bits);
423  if (mb_num >= s->mb_num) {
424  av_log(s->avctx, AV_LOG_ERROR,
425  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
426  return -1;
427  }
428 
429  s->mb_x = mb_num % s->mb_width;
430  s->mb_y = mb_num / s->mb_width;
431 
432  if (ctx->shape != BIN_ONLY_SHAPE) {
433  int qscale = get_bits(&s->gb, s->quant_precision);
434  if (qscale)
435  s->chroma_qscale = s->qscale = qscale;
436  }
437 
438  if (ctx->shape == RECT_SHAPE)
439  header_extension = get_bits1(&s->gb);
440 
441  if (header_extension) {
442  int time_incr = 0;
443 
444  while (get_bits1(&s->gb) != 0)
445  time_incr++;
446 
447  check_marker(&s->gb, "before time_increment in video packed header");
448  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
449  check_marker(&s->gb, "before vop_coding_type in video packed header");
450 
451  skip_bits(&s->gb, 2); /* vop coding type */
452  // FIXME not rect stuff here
453 
454  if (ctx->shape != BIN_ONLY_SHAPE) {
455  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
456  // FIXME don't just ignore everything
457  if (s->pict_type == AV_PICTURE_TYPE_S &&
458  ctx->vol_sprite_usage == GMC_SPRITE) {
459  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
460  return AVERROR_INVALIDDATA;
461  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
462  }
463 
464  // FIXME reduced res stuff here
465 
466  if (s->pict_type != AV_PICTURE_TYPE_I) {
467  int f_code = get_bits(&s->gb, 3); /* fcode_for */
468  if (f_code == 0)
469  av_log(s->avctx, AV_LOG_ERROR,
470  "Error, video packet header damaged (f_code=0)\n");
471  }
472  if (s->pict_type == AV_PICTURE_TYPE_B) {
473  int b_code = get_bits(&s->gb, 3);
474  if (b_code == 0)
475  av_log(s->avctx, AV_LOG_ERROR,
476  "Error, video packet header damaged (b_code=0)\n");
477  }
478  }
479  }
480  if (ctx->new_pred)
481  decode_new_pred(ctx, &s->gb);
482 
483  return 0;
484 }
485 
486 /**
487  * Get the average motion vector for a GMC MB.
488  * @param n either 0 for the x component or 1 for y
489  * @return the average MV for a GMC MB
490  */
491 static inline int get_amv(Mpeg4DecContext *ctx, int n)
492 {
493  MpegEncContext *s = &ctx->m;
494  int x, y, mb_v, sum, dx, dy, shift;
495  int len = 1 << (s->f_code + 4);
496  const int a = s->sprite_warping_accuracy;
497 
498  if (s->workaround_bugs & FF_BUG_AMV)
499  len >>= s->quarter_sample;
500 
501  if (s->real_sprite_warping_points == 1) {
502  if (ctx->divx_version == 500 && ctx->divx_build == 413)
503  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
504  else
505  sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
506  } else {
507  dx = s->sprite_delta[n][0];
508  dy = s->sprite_delta[n][1];
509  shift = ctx->sprite_shift[0];
510  if (n)
511  dy -= 1 << (shift + a + 1);
512  else
513  dx -= 1 << (shift + a + 1);
514  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
515 
516  sum = 0;
517  for (y = 0; y < 16; y++) {
518  int v;
519 
520  v = mb_v + dy * y;
521  // FIXME optimize
522  for (x = 0; x < 16; x++) {
523  sum += v >> shift;
524  v += dx;
525  }
526  }
527  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
528  }
529 
530  if (sum < -len)
531  sum = -len;
532  else if (sum >= len)
533  sum = len - 1;
534 
535  return sum;
536 }
537 
538 /**
539  * Decode the dc value.
540  * @param n block index (0-3 are luma, 4-5 are chroma)
541  * @param dir_ptr the prediction direction will be stored here
542  * @return the quantized dc
543  */
544 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
545 {
546  int level, code;
547 
548  if (n < 4)
549  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
550  else
551  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
552 
553  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
554  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
555  return -1;
556  }
557 
558  if (code == 0) {
559  level = 0;
560  } else {
561  if (IS_3IV1) {
562  if (code == 1)
563  level = 2 * get_bits1(&s->gb) - 1;
564  else {
565  if (get_bits1(&s->gb))
566  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
567  else
568  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
569  }
570  } else {
571  level = get_xbits(&s->gb, code);
572  }
573 
574  if (code > 8) {
575  if (get_bits1(&s->gb) == 0) { /* marker */
576  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
577  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
578  return -1;
579  }
580  }
581  }
582  }
583 
584  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
585 }
586 
587 /**
588  * Decode first partition.
589  * @return number of MBs decoded or <0 if an error occurred
590  */
591 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
592 {
593  MpegEncContext *s = &ctx->m;
594  int mb_num = 0;
595  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
596 
597  /* decode first partition */
598  s->first_slice_line = 1;
599  for (; s->mb_y < s->mb_height; s->mb_y++) {
600  ff_init_block_index(s);
601  for (; s->mb_x < s->mb_width; s->mb_x++) {
602  const int xy = s->mb_x + s->mb_y * s->mb_stride;
603  int cbpc;
604  int dir = 0;
605 
606  mb_num++;
607  ff_update_block_index(s);
608  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
609  s->first_slice_line = 0;
610 
611  if (s->pict_type == AV_PICTURE_TYPE_I) {
612  int i;
613 
614  do {
615  if (show_bits_long(&s->gb, 19) == DC_MARKER)
616  return mb_num - 1;
617 
618  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
619  if (cbpc < 0) {
620  av_log(s->avctx, AV_LOG_ERROR,
621  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
622  return -1;
623  }
624  } while (cbpc == 8);
625 
626  s->cbp_table[xy] = cbpc & 3;
627  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
628  s->mb_intra = 1;
629 
630  if (cbpc & 4)
631  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
632 
633  s->current_picture.qscale_table[xy] = s->qscale;
634 
635  s->mbintra_table[xy] = 1;
636  for (i = 0; i < 6; i++) {
637  int dc_pred_dir;
638  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
639  if (dc < 0) {
640  av_log(s->avctx, AV_LOG_ERROR,
641  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
642  return -1;
643  }
644  dir <<= 1;
645  if (dc_pred_dir)
646  dir |= 1;
647  }
648  s->pred_dir_table[xy] = dir;
649  } else { /* P/S_TYPE */
650  int mx, my, pred_x, pred_y, bits;
651  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
652  const int stride = s->b8_stride * 2;
653 
654 try_again:
655  bits = show_bits(&s->gb, 17);
656  if (bits == MOTION_MARKER)
657  return mb_num - 1;
658 
659  skip_bits1(&s->gb);
660  if (bits & 0x10000) {
661  /* skip mb */
662  if (s->pict_type == AV_PICTURE_TYPE_S &&
663  ctx->vol_sprite_usage == GMC_SPRITE) {
664  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
665  MB_TYPE_16x16 |
666  MB_TYPE_GMC |
667  MB_TYPE_L0;
668  mx = get_amv(ctx, 0);
669  my = get_amv(ctx, 1);
670  } else {
671  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
672  MB_TYPE_16x16 |
673  MB_TYPE_L0;
674  mx = my = 0;
675  }
676  mot_val[0] =
677  mot_val[2] =
678  mot_val[0 + stride] =
679  mot_val[2 + stride] = mx;
680  mot_val[1] =
681  mot_val[3] =
682  mot_val[1 + stride] =
683  mot_val[3 + stride] = my;
684 
685  if (s->mbintra_table[xy])
686  ff_clean_intra_table_entries(s);
687  continue;
688  }
689 
690  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
691  if (cbpc < 0) {
692  av_log(s->avctx, AV_LOG_ERROR,
693  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
694  return -1;
695  }
696  if (cbpc == 20)
697  goto try_again;
698 
699  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
700 
701  s->mb_intra = ((cbpc & 4) != 0);
702 
703  if (s->mb_intra) {
704  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
705  s->mbintra_table[xy] = 1;
706  mot_val[0] =
707  mot_val[2] =
708  mot_val[0 + stride] =
709  mot_val[2 + stride] = 0;
710  mot_val[1] =
711  mot_val[3] =
712  mot_val[1 + stride] =
713  mot_val[3 + stride] = 0;
714  } else {
715  if (s->mbintra_table[xy])
716  ff_clean_intra_table_entries(s);
717 
718  if (s->pict_type == AV_PICTURE_TYPE_S &&
719  ctx->vol_sprite_usage == GMC_SPRITE &&
720  (cbpc & 16) == 0)
721  s->mcsel = get_bits1(&s->gb);
722  else
723  s->mcsel = 0;
724 
725  if ((cbpc & 16) == 0) {
726  /* 16x16 motion prediction */
727 
728  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
729  if (!s->mcsel) {
730  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
731  if (mx >= 0xffff)
732  return -1;
733 
734  my = ff_h263_decode_motion(s, pred_y, s->f_code);
735  if (my >= 0xffff)
736  return -1;
737  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
738  MB_TYPE_L0;
739  } else {
740  mx = get_amv(ctx, 0);
741  my = get_amv(ctx, 1);
742  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
743  MB_TYPE_GMC |
744  MB_TYPE_L0;
745  }
746 
747  mot_val[0] =
748  mot_val[2] =
749  mot_val[0 + stride] =
750  mot_val[2 + stride] = mx;
751  mot_val[1] =
752  mot_val[3] =
753  mot_val[1 + stride] =
754  mot_val[3 + stride] = my;
755  } else {
756  int i;
757  s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
758  MB_TYPE_L0;
759  for (i = 0; i < 4; i++) {
760  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
761  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
762  if (mx >= 0xffff)
763  return -1;
764 
765  my = ff_h263_decode_motion(s, pred_y, s->f_code);
766  if (my >= 0xffff)
767  return -1;
768  mot_val[0] = mx;
769  mot_val[1] = my;
770  }
771  }
772  }
773  }
774  }
775  s->mb_x = 0;
776  }
777 
778  return mb_num;
779 }
780 
781 /**
782  * decode second partition.
783  * @return <0 if an error occurred
784  */
785 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
786 {
787  int mb_num = 0;
788  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
789 
790  s->mb_x = s->resync_mb_x;
791  s->first_slice_line = 1;
792  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
793  ff_init_block_index(s);
794  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
795  const int xy = s->mb_x + s->mb_y * s->mb_stride;
796 
797  mb_num++;
798  ff_update_block_index(s);
799  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
800  s->first_slice_line = 0;
801 
802  if (s->pict_type == AV_PICTURE_TYPE_I) {
803  int ac_pred = get_bits1(&s->gb);
804  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
805  if (cbpy < 0) {
806  av_log(s->avctx, AV_LOG_ERROR,
807  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
808  return -1;
809  }
810 
811  s->cbp_table[xy] |= cbpy << 2;
812  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
813  } else { /* P || S_TYPE */
814  if (IS_INTRA(s->current_picture.mb_type[xy])) {
815  int i;
816  int dir = 0;
817  int ac_pred = get_bits1(&s->gb);
818  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
819 
820  if (cbpy < 0) {
821  av_log(s->avctx, AV_LOG_ERROR,
822  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
823  return -1;
824  }
825 
826  if (s->cbp_table[xy] & 8)
827  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
828  s->current_picture.qscale_table[xy] = s->qscale;
829 
830  for (i = 0; i < 6; i++) {
831  int dc_pred_dir;
832  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
833  if (dc < 0) {
834  av_log(s->avctx, AV_LOG_ERROR,
835  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
836  return -1;
837  }
838  dir <<= 1;
839  if (dc_pred_dir)
840  dir |= 1;
841  }
842  s->cbp_table[xy] &= 3; // remove dquant
843  s->cbp_table[xy] |= cbpy << 2;
844  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
845  s->pred_dir_table[xy] = dir;
846  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
847  s->current_picture.qscale_table[xy] = s->qscale;
848  s->cbp_table[xy] = 0;
849  } else {
850  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
851 
852  if (cbpy < 0) {
853  av_log(s->avctx, AV_LOG_ERROR,
854  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
855  return -1;
856  }
857 
858  if (s->cbp_table[xy] & 8)
859  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
860  s->current_picture.qscale_table[xy] = s->qscale;
861 
862  s->cbp_table[xy] &= 3; // remove dquant
863  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
864  }
865  }
866  }
867  if (mb_num >= mb_count)
868  return 0;
869  s->mb_x = 0;
870  }
871  return 0;
872 }
873 
874 /**
875  * Decode the first and second partition.
876  * @return <0 if error (and sets error type in the error_status_table)
877  */
878 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
879 {
880  MpegEncContext *s = &ctx->m;
881  int mb_num;
882  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
883  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
884 
885  mb_num = mpeg4_decode_partition_a(ctx);
886  if (mb_num < 0) {
887  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
888  s->mb_x, s->mb_y, part_a_error);
889  return -1;
890  }
891 
892  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
893  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
894  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
895  s->mb_x, s->mb_y, part_a_error);
896  return -1;
897  }
898 
899  s->mb_num_left = mb_num;
900 
901  if (s->pict_type == AV_PICTURE_TYPE_I) {
902  while (show_bits(&s->gb, 9) == 1)
903  skip_bits(&s->gb, 9);
904  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
905  av_log(s->avctx, AV_LOG_ERROR,
906  "marker missing after first I partition at %d %d\n",
907  s->mb_x, s->mb_y);
908  return -1;
909  }
910  } else {
911  while (show_bits(&s->gb, 10) == 1)
912  skip_bits(&s->gb, 10);
913  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
914  av_log(s->avctx, AV_LOG_ERROR,
915  "marker missing after first P partition at %d %d\n",
916  s->mb_x, s->mb_y);
917  return -1;
918  }
919  }
920  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
921  s->mb_x - 1, s->mb_y, part_a_end);
922 
923  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
924  if (s->pict_type == AV_PICTURE_TYPE_P)
925  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
926  s->mb_x, s->mb_y, ER_DC_ERROR);
927  return -1;
928  } else {
929  if (s->pict_type == AV_PICTURE_TYPE_P)
930  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
931  s->mb_x - 1, s->mb_y, ER_DC_END);
932  }
933 
934  return 0;
935 }
936 
937 /**
938  * Decode a block.
939  * @return <0 if an error occurred
940  */
941 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
942  int n, int coded, int intra, int rvlc)
943 {
944  MpegEncContext *s = &ctx->m;
945  int level, i, last, run, qmul, qadd;
946  int av_uninit(dc_pred_dir);
947  RLTable *rl;
948  RL_VLC_ELEM *rl_vlc;
949  const uint8_t *scan_table;
950 
951  // Note intra & rvlc should be optimized away if this is inlined
952 
953  if (intra) {
954  if (ctx->use_intra_dc_vlc) {
955  /* DC coef */
956  if (s->partitioned_frame) {
957  level = s->dc_val[0][s->block_index[n]];
958  if (n < 4)
959  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
960  else
961  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
962  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
963  } else {
964  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
965  if (level < 0)
966  return -1;
967  }
968  block[0] = level;
969  i = 0;
970  } else {
971  i = -1;
972  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
973  }
974  if (!coded)
975  goto not_coded;
976 
977  if (rvlc) {
978  rl = &ff_rvlc_rl_intra;
979  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
980  } else {
981  rl = &ff_mpeg4_rl_intra;
982  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
983  }
984  if (s->ac_pred) {
985  if (dc_pred_dir == 0)
986  scan_table = s->intra_v_scantable.permutated; /* left */
987  else
988  scan_table = s->intra_h_scantable.permutated; /* top */
989  } else {
990  scan_table = s->intra_scantable.permutated;
991  }
992  qmul = 1;
993  qadd = 0;
994  } else {
995  i = -1;
996  if (!coded) {
997  s->block_last_index[n] = i;
998  return 0;
999  }
1000  if (rvlc)
1001  rl = &ff_rvlc_rl_inter;
1002  else
1003  rl = &ff_h263_rl_inter;
1004 
1005  scan_table = s->intra_scantable.permutated;
1006 
1007  if (s->mpeg_quant) {
1008  qmul = 1;
1009  qadd = 0;
1010  if (rvlc)
1011  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1012  else
1013  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1014  } else {
1015  qmul = s->qscale << 1;
1016  qadd = (s->qscale - 1) | 1;
1017  if (rvlc)
1018  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1019  else
1020  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1021  }
1022  }
1023  {
1024  OPEN_READER(re, &s->gb);
1025  for (;;) {
1026  UPDATE_CACHE(re, &s->gb);
1027  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1028  if (level == 0) {
1029  /* escape */
1030  if (rvlc) {
1031  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1032  av_log(s->avctx, AV_LOG_ERROR,
1033  "1. marker bit missing in rvlc esc\n");
1034  return -1;
1035  }
1036  SKIP_CACHE(re, &s->gb, 1);
1037 
1038  last = SHOW_UBITS(re, &s->gb, 1);
1039  SKIP_CACHE(re, &s->gb, 1);
1040  run = SHOW_UBITS(re, &s->gb, 6);
1041  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1042  UPDATE_CACHE(re, &s->gb);
1043 
1044  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1045  av_log(s->avctx, AV_LOG_ERROR,
1046  "2. marker bit missing in rvlc esc\n");
1047  return -1;
1048  }
1049  SKIP_CACHE(re, &s->gb, 1);
1050 
1051  level = SHOW_UBITS(re, &s->gb, 11);
1052  SKIP_CACHE(re, &s->gb, 11);
1053 
1054  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1055  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1056  return -1;
1057  }
1058  SKIP_CACHE(re, &s->gb, 5);
1059 
1060  level = level * qmul + qadd;
1061  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1062  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1063 
1064  i += run + 1;
1065  if (last)
1066  i += 192;
1067  } else {
1068  int cache;
1069  cache = GET_CACHE(re, &s->gb);
1070 
1071  if (IS_3IV1)
1072  cache ^= 0xC0000000;
1073 
1074  if (cache & 0x80000000) {
1075  if (cache & 0x40000000) {
1076  /* third escape */
1077  SKIP_CACHE(re, &s->gb, 2);
1078  last = SHOW_UBITS(re, &s->gb, 1);
1079  SKIP_CACHE(re, &s->gb, 1);
1080  run = SHOW_UBITS(re, &s->gb, 6);
1081  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1082  UPDATE_CACHE(re, &s->gb);
1083 
1084  if (IS_3IV1) {
1085  level = SHOW_SBITS(re, &s->gb, 12);
1086  LAST_SKIP_BITS(re, &s->gb, 12);
1087  } else {
1088  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1089  av_log(s->avctx, AV_LOG_ERROR,
1090  "1. marker bit missing in 3. esc\n");
1091  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1092  return -1;
1093  }
1094  SKIP_CACHE(re, &s->gb, 1);
1095 
1096  level = SHOW_SBITS(re, &s->gb, 12);
1097  SKIP_CACHE(re, &s->gb, 12);
1098 
1099  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1100  av_log(s->avctx, AV_LOG_ERROR,
1101  "2. marker bit missing in 3. esc\n");
1102  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1103  return -1;
1104  }
1105 
1106  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1107  }
1108 
1109 #if 0
1110  if (s->error_recognition >= FF_ER_COMPLIANT) {
1111  const int abs_level= FFABS(level);
1112  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1113  const int run1= run - rl->max_run[last][abs_level] - 1;
1114  if (abs_level <= rl->max_level[last][run]) {
1115  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1116  return -1;
1117  }
1118  if (s->error_recognition > FF_ER_COMPLIANT) {
1119  if (abs_level <= rl->max_level[last][run]*2) {
1120  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1121  return -1;
1122  }
1123  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1124  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1125  return -1;
1126  }
1127  }
1128  }
1129  }
1130 #endif
1131  if (level > 0)
1132  level = level * qmul + qadd;
1133  else
1134  level = level * qmul - qadd;
1135 
1136  if ((unsigned)(level + 2048) > 4095) {
1137  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1138  if (level > 2560 || level < -2560) {
1139  av_log(s->avctx, AV_LOG_ERROR,
1140  "|level| overflow in 3. esc, qp=%d\n",
1141  s->qscale);
1142  return -1;
1143  }
1144  }
1145  level = level < 0 ? -2048 : 2047;
1146  }
1147 
1148  i += run + 1;
1149  if (last)
1150  i += 192;
1151  } else {
1152  /* second escape */
1153  SKIP_BITS(re, &s->gb, 2);
1154  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1155  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1156  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1157  LAST_SKIP_BITS(re, &s->gb, 1);
1158  }
1159  } else {
1160  /* first escape */
1161  SKIP_BITS(re, &s->gb, 1);
1162  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1163  i += run;
1164  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1165  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1166  LAST_SKIP_BITS(re, &s->gb, 1);
1167  }
1168  }
1169  } else {
1170  i += run;
1171  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1172  LAST_SKIP_BITS(re, &s->gb, 1);
1173  }
1174  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1175  if (i > 62) {
1176  i -= 192;
1177  if (i & (~63)) {
1178  av_log(s->avctx, AV_LOG_ERROR,
1179  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1180  return -1;
1181  }
1182 
1183  block[scan_table[i]] = level;
1184  break;
1185  }
1186 
1187  block[scan_table[i]] = level;
1188  }
1189  CLOSE_READER(re, &s->gb);
1190  }
1191 
1192 not_coded:
1193  if (intra) {
1194  if (!ctx->use_intra_dc_vlc) {
1195  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1196 
1197  i -= i >> 31; // if (i == -1) i = 0;
1198  }
1199 
1200  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1201  if (s->ac_pred)
1202  i = 63; // FIXME not optimal
1203  }
1204  s->block_last_index[n] = i;
1205  return 0;
1206 }
1207 
1208 /**
1209  * decode partition C of one MB.
1210  * @return <0 if an error occurred
1211  */
1212 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1213 {
1214  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1215  int cbp, mb_type;
1216  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1217 
1218  mb_type = s->current_picture.mb_type[xy];
1219  cbp = s->cbp_table[xy];
1220 
1221  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1222 
1223  if (s->current_picture.qscale_table[xy] != s->qscale)
1224  ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1225 
1226  if (s->pict_type == AV_PICTURE_TYPE_P ||
1227  s->pict_type == AV_PICTURE_TYPE_S) {
1228  int i;
1229  for (i = 0; i < 4; i++) {
1230  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1231  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1232  }
1233  s->mb_intra = IS_INTRA(mb_type);
1234 
1235  if (IS_SKIP(mb_type)) {
1236  /* skip mb */
1237  for (i = 0; i < 6; i++)
1238  s->block_last_index[i] = -1;
1239  s->mv_dir = MV_DIR_FORWARD;
1240  s->mv_type = MV_TYPE_16X16;
1241  if (s->pict_type == AV_PICTURE_TYPE_S
1242  && ctx->vol_sprite_usage == GMC_SPRITE) {
1243  s->mcsel = 1;
1244  s->mb_skipped = 0;
1245  } else {
1246  s->mcsel = 0;
1247  s->mb_skipped = 1;
1248  }
1249  } else if (s->mb_intra) {
1250  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1251  } else if (!s->mb_intra) {
1252  // s->mcsel = 0; // FIXME do we need to init that?
1253 
1254  s->mv_dir = MV_DIR_FORWARD;
1255  if (IS_8X8(mb_type)) {
1256  s->mv_type = MV_TYPE_8X8;
1257  } else {
1258  s->mv_type = MV_TYPE_16X16;
1259  }
1260  }
1261  } else { /* I-Frame */
1262  s->mb_intra = 1;
1263  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1264  }
1265 
1266  if (!IS_SKIP(mb_type)) {
1267  int i;
1268  s->bdsp.clear_blocks(s->block[0]);
1269  /* decode each block */
1270  for (i = 0; i < 6; i++) {
1271  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1272  av_log(s->avctx, AV_LOG_ERROR,
1273  "texture corrupted at %d %d %d\n",
1274  s->mb_x, s->mb_y, s->mb_intra);
1275  return -1;
1276  }
1277  cbp += cbp;
1278  }
1279  }
1280 
1281  /* per-MB end of slice check */
1282  if (--s->mb_num_left <= 0) {
1283  if (mpeg4_is_resync(ctx))
1284  return SLICE_END;
1285  else
1286  return SLICE_NOEND;
1287  } else {
1288  if (mpeg4_is_resync(ctx)) {
1289  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1290  if (s->cbp_table[xy + delta])
1291  return SLICE_END;
1292  }
1293  return SLICE_OK;
1294  }
1295 }
1296 
1297 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1298 {
1299  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1300  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1301  int16_t *mot_val;
1302  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1303  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1304 
1305  av_assert2(s->h263_pred);
1306 
1307  if (s->pict_type == AV_PICTURE_TYPE_P ||
1308  s->pict_type == AV_PICTURE_TYPE_S) {
1309  do {
1310  if (get_bits1(&s->gb)) {
1311  /* skip mb */
1312  s->mb_intra = 0;
1313  for (i = 0; i < 6; i++)
1314  s->block_last_index[i] = -1;
1315  s->mv_dir = MV_DIR_FORWARD;
1316  s->mv_type = MV_TYPE_16X16;
1317  if (s->pict_type == AV_PICTURE_TYPE_S &&
1318  ctx->vol_sprite_usage == GMC_SPRITE) {
1319  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1320  MB_TYPE_GMC |
1321  MB_TYPE_16x16 |
1322  MB_TYPE_L0;
1323  s->mcsel = 1;
1324  s->mv[0][0][0] = get_amv(ctx, 0);
1325  s->mv[0][0][1] = get_amv(ctx, 1);
1326  s->mb_skipped = 0;
1327  } else {
1328  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1329  MB_TYPE_16x16 |
1330  MB_TYPE_L0;
1331  s->mcsel = 0;
1332  s->mv[0][0][0] = 0;
1333  s->mv[0][0][1] = 0;
1334  s->mb_skipped = 1;
1335  }
1336  goto end;
1337  }
1338  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1339  if (cbpc < 0) {
1340  av_log(s->avctx, AV_LOG_ERROR,
1341  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1342  return -1;
1343  }
1344  } while (cbpc == 20);
1345 
1346  s->bdsp.clear_blocks(s->block[0]);
1347  dquant = cbpc & 8;
1348  s->mb_intra = ((cbpc & 4) != 0);
1349  if (s->mb_intra)
1350  goto intra;
1351 
1352  if (s->pict_type == AV_PICTURE_TYPE_S &&
1353  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1354  s->mcsel = get_bits1(&s->gb);
1355  else
1356  s->mcsel = 0;
1357  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1358  if (cbpy < 0) {
1359  av_log(s->avctx, AV_LOG_ERROR,
1360  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1361  return AVERROR_INVALIDDATA;
1362  }
1363 
1364  cbp = (cbpc & 3) | (cbpy << 2);
1365  if (dquant)
1366  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1367  if ((!s->progressive_sequence) &&
1368  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1369  s->interlaced_dct = get_bits1(&s->gb);
1370 
1371  s->mv_dir = MV_DIR_FORWARD;
1372  if ((cbpc & 16) == 0) {
1373  if (s->mcsel) {
1374  s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1375  MB_TYPE_16x16 |
1376  MB_TYPE_L0;
1377  /* 16x16 global motion prediction */
1378  s->mv_type = MV_TYPE_16X16;
1379  mx = get_amv(ctx, 0);
1380  my = get_amv(ctx, 1);
1381  s->mv[0][0][0] = mx;
1382  s->mv[0][0][1] = my;
1383  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1384  s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1385  MB_TYPE_L0 |
1386  MB_TYPE_INTERLACED;
1387  /* 16x8 field motion prediction */
1388  s->mv_type = MV_TYPE_FIELD;
1389 
1390  s->field_select[0][0] = get_bits1(&s->gb);
1391  s->field_select[0][1] = get_bits1(&s->gb);
1392 
1393  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1394 
1395  for (i = 0; i < 2; i++) {
1396  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1397  if (mx >= 0xffff)
1398  return -1;
1399 
1400  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1401  if (my >= 0xffff)
1402  return -1;
1403 
1404  s->mv[0][i][0] = mx;
1405  s->mv[0][i][1] = my;
1406  }
1407  } else {
1408  s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1409  /* 16x16 motion prediction */
1410  s->mv_type = MV_TYPE_16X16;
1411  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1412  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1413 
1414  if (mx >= 0xffff)
1415  return -1;
1416 
1417  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1418 
1419  if (my >= 0xffff)
1420  return -1;
1421  s->mv[0][0][0] = mx;
1422  s->mv[0][0][1] = my;
1423  }
1424  } else {
1425  s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1426  s->mv_type = MV_TYPE_8X8;
1427  for (i = 0; i < 4; i++) {
1428  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1429  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1430  if (mx >= 0xffff)
1431  return -1;
1432 
1433  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1434  if (my >= 0xffff)
1435  return -1;
1436  s->mv[0][i][0] = mx;
1437  s->mv[0][i][1] = my;
1438  mot_val[0] = mx;
1439  mot_val[1] = my;
1440  }
1441  }
1442  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1443  int modb1; // first bit of modb
1444  int modb2; // second bit of modb
1445  int mb_type;
1446 
1447  s->mb_intra = 0; // B-frames never contain intra blocks
1448  s->mcsel = 0; // ... true gmc blocks
1449 
1450  if (s->mb_x == 0) {
1451  for (i = 0; i < 2; i++) {
1452  s->last_mv[i][0][0] =
1453  s->last_mv[i][0][1] =
1454  s->last_mv[i][1][0] =
1455  s->last_mv[i][1][1] = 0;
1456  }
1457 
1458  ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1459  }
1460 
1461  /* if we skipped it in the future P Frame than skip it now too */
1462  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1463 
1464  if (s->mb_skipped) {
1465  /* skip mb */
1466  for (i = 0; i < 6; i++)
1467  s->block_last_index[i] = -1;
1468 
1469  s->mv_dir = MV_DIR_FORWARD;
1470  s->mv_type = MV_TYPE_16X16;
1471  s->mv[0][0][0] =
1472  s->mv[0][0][1] =
1473  s->mv[1][0][0] =
1474  s->mv[1][0][1] = 0;
1475  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1476  MB_TYPE_16x16 |
1477  MB_TYPE_L0;
1478  goto end;
1479  }
1480 
1481  modb1 = get_bits1(&s->gb);
1482  if (modb1) {
1483  // like MB_TYPE_B_DIRECT but no vectors coded
1484  mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1485  cbp = 0;
1486  } else {
1487  modb2 = get_bits1(&s->gb);
1488  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1489  if (mb_type < 0) {
1490  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1491  return -1;
1492  }
1493  mb_type = mb_type_b_map[mb_type];
1494  if (modb2) {
1495  cbp = 0;
1496  } else {
1497  s->bdsp.clear_blocks(s->block[0]);
1498  cbp = get_bits(&s->gb, 6);
1499  }
1500 
1501  if ((!IS_DIRECT(mb_type)) && cbp) {
1502  if (get_bits1(&s->gb))
1503  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1504  }
1505 
1506  if (!s->progressive_sequence) {
1507  if (cbp)
1508  s->interlaced_dct = get_bits1(&s->gb);
1509 
1510  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1511  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1512  mb_type &= ~MB_TYPE_16x16;
1513 
1514  if (USES_LIST(mb_type, 0)) {
1515  s->field_select[0][0] = get_bits1(&s->gb);
1516  s->field_select[0][1] = get_bits1(&s->gb);
1517  }
1518  if (USES_LIST(mb_type, 1)) {
1519  s->field_select[1][0] = get_bits1(&s->gb);
1520  s->field_select[1][1] = get_bits1(&s->gb);
1521  }
1522  }
1523  }
1524 
1525  s->mv_dir = 0;
1526  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1527  s->mv_type = MV_TYPE_16X16;
1528 
1529  if (USES_LIST(mb_type, 0)) {
1530  s->mv_dir = MV_DIR_FORWARD;
1531 
1532  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1533  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1534  s->last_mv[0][1][0] =
1535  s->last_mv[0][0][0] =
1536  s->mv[0][0][0] = mx;
1537  s->last_mv[0][1][1] =
1538  s->last_mv[0][0][1] =
1539  s->mv[0][0][1] = my;
1540  }
1541 
1542  if (USES_LIST(mb_type, 1)) {
1543  s->mv_dir |= MV_DIR_BACKWARD;
1544 
1545  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1546  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1547  s->last_mv[1][1][0] =
1548  s->last_mv[1][0][0] =
1549  s->mv[1][0][0] = mx;
1550  s->last_mv[1][1][1] =
1551  s->last_mv[1][0][1] =
1552  s->mv[1][0][1] = my;
1553  }
1554  } else if (!IS_DIRECT(mb_type)) {
1555  s->mv_type = MV_TYPE_FIELD;
1556 
1557  if (USES_LIST(mb_type, 0)) {
1558  s->mv_dir = MV_DIR_FORWARD;
1559 
1560  for (i = 0; i < 2; i++) {
1561  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1562  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1563  s->last_mv[0][i][0] =
1564  s->mv[0][i][0] = mx;
1565  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1566  }
1567  }
1568 
1569  if (USES_LIST(mb_type, 1)) {
1570  s->mv_dir |= MV_DIR_BACKWARD;
1571 
1572  for (i = 0; i < 2; i++) {
1573  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1574  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1575  s->last_mv[1][i][0] =
1576  s->mv[1][i][0] = mx;
1577  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1578  }
1579  }
1580  }
1581  }
1582 
1583  if (IS_DIRECT(mb_type)) {
1584  if (IS_SKIP(mb_type)) {
1585  mx =
1586  my = 0;
1587  } else {
1588  mx = ff_h263_decode_motion(s, 0, 1);
1589  my = ff_h263_decode_motion(s, 0, 1);
1590  }
1591 
1592  s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1593  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1594  }
1595  s->current_picture.mb_type[xy] = mb_type;
1596  } else { /* I-Frame */
1597  do {
1598  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1599  if (cbpc < 0) {
1600  av_log(s->avctx, AV_LOG_ERROR,
1601  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1602  return -1;
1603  }
1604  } while (cbpc == 8);
1605 
1606  dquant = cbpc & 4;
1607  s->mb_intra = 1;
1608 
1609 intra:
1610  s->ac_pred = get_bits1(&s->gb);
1611  if (s->ac_pred)
1612  s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1613  else
1614  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1615 
1616  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1617  if (cbpy < 0) {
1618  av_log(s->avctx, AV_LOG_ERROR,
1619  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1620  return -1;
1621  }
1622  cbp = (cbpc & 3) | (cbpy << 2);
1623 
1624  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1625 
1626  if (dquant)
1627  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1628 
1629  if (!s->progressive_sequence)
1630  s->interlaced_dct = get_bits1(&s->gb);
1631 
1632  s->bdsp.clear_blocks(s->block[0]);
1633  /* decode each block */
1634  for (i = 0; i < 6; i++) {
1635  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1636  return -1;
1637  cbp += cbp;
1638  }
1639  goto end;
1640  }
1641 
1642  /* decode each block */
1643  for (i = 0; i < 6; i++) {
1644  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1645  return -1;
1646  cbp += cbp;
1647  }
1648 
1649 end:
1650  /* per-MB end of slice check */
1651  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1652  int next = mpeg4_is_resync(ctx);
1653  if (next) {
1654  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1655  return -1;
1656  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1657  return SLICE_END;
1658 
1659  if (s->pict_type == AV_PICTURE_TYPE_B) {
1660  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1661  ff_thread_await_progress(&s->next_picture_ptr->tf,
1662  (s->mb_x + delta >= s->mb_width)
1663  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1664  : s->mb_y, 0);
1665  if (s->next_picture.mbskip_table[xy + delta])
1666  return SLICE_OK;
1667  }
1668 
1669  return SLICE_END;
1670  }
1671  }
1672 
1673  return SLICE_OK;
1674 }
1675 
1676 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1677 {
1678  int hours, minutes, seconds;
1679 
1680  if (!show_bits(gb, 23)) {
1681  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1682  return -1;
1683  }
1684 
1685  hours = get_bits(gb, 5);
1686  minutes = get_bits(gb, 6);
1687  check_marker(gb, "in gop_header");
1688  seconds = get_bits(gb, 6);
1689 
1690  s->time_base = seconds + 60*(minutes + 60*hours);
1691 
1692  skip_bits1(gb);
1693  skip_bits1(gb);
1694 
1695  return 0;
1696 }
1697 
1698 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1699 {
1700 
1701  s->avctx->profile = get_bits(gb, 4);
1702  s->avctx->level = get_bits(gb, 4);
1703 
1704  // for Simple profile, level 0
1705  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1706  s->avctx->level = 0;
1707  }
1708 
1709  return 0;
1710 }
1711 
1712 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1713 {
1714  MpegEncContext *s = &ctx->m;
1715  int width, height, vo_ver_id;
1716 
1717  /* vol header */
1718  skip_bits(gb, 1); /* random access */
1719  s->vo_type = get_bits(gb, 8);
1720  if (get_bits1(gb) != 0) { /* is_ol_id */
1721  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1722  skip_bits(gb, 3); /* vo_priority */
1723  } else {
1724  vo_ver_id = 1;
1725  }
1726  s->aspect_ratio_info = get_bits(gb, 4);
1727  if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1728  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1729  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1730  } else {
1731  s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1732  }
1733 
1734  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1735  int chroma_format = get_bits(gb, 2);
1736  if (chroma_format != CHROMA_420)
1737  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1738 
1739  s->low_delay = get_bits1(gb);
1740  if (get_bits1(gb)) { /* vbv parameters */
1741  get_bits(gb, 15); /* first_half_bitrate */
1742  check_marker(gb, "after first_half_bitrate");
1743  get_bits(gb, 15); /* latter_half_bitrate */
1744  check_marker(gb, "after latter_half_bitrate");
1745  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1746  check_marker(gb, "after first_half_vbv_buffer_size");
1747  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1748  get_bits(gb, 11); /* first_half_vbv_occupancy */
1749  check_marker(gb, "after first_half_vbv_occupancy");
1750  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1751  check_marker(gb, "after latter_half_vbv_occupancy");
1752  }
1753  } else {
1754  /* is setting low delay flag only once the smartest thing to do?
1755  * low delay detection won't be overridden. */
1756  if (s->picture_number == 0)
1757  s->low_delay = 0;
1758  }
1759 
1760  ctx->shape = get_bits(gb, 2); /* vol shape */
1761  if (ctx->shape != RECT_SHAPE)
1762  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1763  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1764  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1765  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1766  }
1767 
1768  check_marker(gb, "before time_increment_resolution");
1769 
1770  s->avctx->framerate.num = get_bits(gb, 16);
1771  if (!s->avctx->framerate.num) {
1772  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1773  return AVERROR_INVALIDDATA;
1774  }
1775 
1776  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1777  if (ctx->time_increment_bits < 1)
1778  ctx->time_increment_bits = 1;
1779 
1780  check_marker(gb, "before fixed_vop_rate");
1781 
1782  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1783  s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
1784  else
1785  s->avctx->framerate.den = 1;
1786 
1787  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1788 
1789  ctx->t_frame = 0;
1790 
1791  if (ctx->shape != BIN_ONLY_SHAPE) {
1792  if (ctx->shape == RECT_SHAPE) {
1793  check_marker(gb, "before width");
1794  width = get_bits(gb, 13);
1795  check_marker(gb, "before height");
1796  height = get_bits(gb, 13);
1797  check_marker(gb, "after height");
1798  if (width && height && /* they should be non zero but who knows */
1799  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1800  if (s->width && s->height &&
1801  (s->width != width || s->height != height))
1802  s->context_reinit = 1;
1803  s->width = width;
1804  s->height = height;
1805  }
1806  }
1807 
1808  s->progressive_sequence =
1809  s->progressive_frame = get_bits1(gb) ^ 1;
1810  s->interlaced_dct = 0;
1811  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1812  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1813  "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1814  if (vo_ver_id == 1)
1815  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1816  else
1817  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1818 
1819  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1820  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1821  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1822  ctx->vol_sprite_usage == GMC_SPRITE) {
1823  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1824  skip_bits(gb, 13); // sprite_width
1825  check_marker(gb, "after sprite_width");
1826  skip_bits(gb, 13); // sprite_height
1827  check_marker(gb, "after sprite_height");
1828  skip_bits(gb, 13); // sprite_left
1829  check_marker(gb, "after sprite_left");
1830  skip_bits(gb, 13); // sprite_top
1831  check_marker(gb, "after sprite_top");
1832  }
1833  ctx->num_sprite_warping_points = get_bits(gb, 6);
1834  if (ctx->num_sprite_warping_points > 3) {
1835  av_log(s->avctx, AV_LOG_ERROR,
1836  "%d sprite_warping_points\n",
1837  ctx->num_sprite_warping_points);
1838  ctx->num_sprite_warping_points = 0;
1839  return AVERROR_INVALIDDATA;
1840  }
1841  s->sprite_warping_accuracy = get_bits(gb, 2);
1842  ctx->sprite_brightness_change = get_bits1(gb);
1843  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1844  skip_bits1(gb); // low_latency_sprite
1845  }
1846  // FIXME sadct disable bit if verid!=1 && shape not rect
1847 
1848  if (get_bits1(gb) == 1) { /* not_8_bit */
1849  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1850  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1851  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1852  if (s->quant_precision != 5)
1853  av_log(s->avctx, AV_LOG_ERROR,
1854  "quant precision %d\n", s->quant_precision);
1855  if (s->quant_precision<3 || s->quant_precision>9) {
1856  s->quant_precision = 5;
1857  }
1858  } else {
1859  s->quant_precision = 5;
1860  }
1861 
1862  // FIXME a bunch of grayscale shape things
1863 
1864  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1865  int i, v;
1866 
1867  /* load default matrixes */
1868  for (i = 0; i < 64; i++) {
1869  int j = s->idsp.idct_permutation[i];
1870  v = ff_mpeg4_default_intra_matrix[i];
1871  s->intra_matrix[j] = v;
1872  s->chroma_intra_matrix[j] = v;
1873 
1874  v = ff_mpeg4_default_non_intra_matrix[i];
1875  s->inter_matrix[j] = v;
1876  s->chroma_inter_matrix[j] = v;
1877  }
1878 
1879  /* load custom intra matrix */
1880  if (get_bits1(gb)) {
1881  int last = 0;
1882  for (i = 0; i < 64; i++) {
1883  int j;
1884  v = get_bits(gb, 8);
1885  if (v == 0)
1886  break;
1887 
1888  last = v;
1889  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1890  s->intra_matrix[j] = last;
1891  s->chroma_intra_matrix[j] = last;
1892  }
1893 
1894  /* replicate last value */
1895  for (; i < 64; i++) {
1896  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1897  s->intra_matrix[j] = last;
1898  s->chroma_intra_matrix[j] = last;
1899  }
1900  }
1901 
1902  /* load custom non intra matrix */
1903  if (get_bits1(gb)) {
1904  int last = 0;
1905  for (i = 0; i < 64; i++) {
1906  int j;
1907  v = get_bits(gb, 8);
1908  if (v == 0)
1909  break;
1910 
1911  last = v;
1912  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1913  s->inter_matrix[j] = v;
1914  s->chroma_inter_matrix[j] = v;
1915  }
1916 
1917  /* replicate last value */
1918  for (; i < 64; i++) {
1919  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1920  s->inter_matrix[j] = last;
1921  s->chroma_inter_matrix[j] = last;
1922  }
1923  }
1924 
1925  // FIXME a bunch of grayscale shape things
1926  }
1927 
1928  if (vo_ver_id != 1)
1929  s->quarter_sample = get_bits1(gb);
1930  else
1931  s->quarter_sample = 0;
1932 
1933  if (get_bits_left(gb) < 4) {
1934  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1935  return AVERROR_INVALIDDATA;
1936  }
1937 
1938  if (!get_bits1(gb)) {
1939  int pos = get_bits_count(gb);
1940  int estimation_method = get_bits(gb, 2);
1941  if (estimation_method < 2) {
1942  if (!get_bits1(gb)) {
1943  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1944  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1945  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1946  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1947  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1948  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1949  }
1950  if (!get_bits1(gb)) {
1951  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1952  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1953  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1954  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1955  }
1956  if (!check_marker(gb, "in complexity estimation part 1")) {
1957  skip_bits_long(gb, pos - get_bits_count(gb));
1958  goto no_cplx_est;
1959  }
1960  if (!get_bits1(gb)) {
1961  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1962  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1963  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1964  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1965  }
1966  if (!get_bits1(gb)) {
1967  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1968  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1969  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1970  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1971  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1972  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1973  }
1974  if (!check_marker(gb, "in complexity estimation part 2")) {
1975  skip_bits_long(gb, pos - get_bits_count(gb));
1976  goto no_cplx_est;
1977  }
1978  if (estimation_method == 1) {
1979  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1980  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1981  }
1982  } else
1983  av_log(s->avctx, AV_LOG_ERROR,
1984  "Invalid Complexity estimation method %d\n",
1985  estimation_method);
1986  } else {
1987 
1988 no_cplx_est:
1989  ctx->cplx_estimation_trash_i =
1990  ctx->cplx_estimation_trash_p =
1991  ctx->cplx_estimation_trash_b = 0;
1992  }
1993 
1994  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1995 
1996  s->data_partitioning = get_bits1(gb);
1997  if (s->data_partitioning)
1998  ctx->rvlc = get_bits1(gb);
1999 
2000  if (vo_ver_id != 1) {
2001  ctx->new_pred = get_bits1(gb);
2002  if (ctx->new_pred) {
2003  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2004  skip_bits(gb, 2); /* requested upstream message type */
2005  skip_bits1(gb); /* newpred segment type */
2006  }
2007  if (get_bits1(gb)) // reduced_res_vop
2008  av_log(s->avctx, AV_LOG_ERROR,
2009  "reduced resolution VOP not supported\n");
2010  } else {
2011  ctx->new_pred = 0;
2012  }
2013 
2014  ctx->scalability = get_bits1(gb);
2015 
2016  if (ctx->scalability) {
2017  GetBitContext bak = *gb;
2018  int h_sampling_factor_n;
2019  int h_sampling_factor_m;
2020  int v_sampling_factor_n;
2021  int v_sampling_factor_m;
2022 
2023  skip_bits1(gb); // hierarchy_type
2024  skip_bits(gb, 4); /* ref_layer_id */
2025  skip_bits1(gb); /* ref_layer_sampling_dir */
2026  h_sampling_factor_n = get_bits(gb, 5);
2027  h_sampling_factor_m = get_bits(gb, 5);
2028  v_sampling_factor_n = get_bits(gb, 5);
2029  v_sampling_factor_m = get_bits(gb, 5);
2030  ctx->enhancement_type = get_bits1(gb);
2031 
2032  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2033  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2034  /* illegal scalability header (VERY broken encoder),
2035  * trying to workaround */
2036  ctx->scalability = 0;
2037  *gb = bak;
2038  } else
2039  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2040 
2041  // bin shape stuff FIXME
2042  }
2043  }
2044 
2045  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2046  av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
2047  s->avctx->framerate.den, s->avctx->framerate.num,
2048  ctx->time_increment_bits,
2049  s->quant_precision,
2050  s->progressive_sequence,
2051  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2052  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2053  );
2054  }
2055 
2056  return 0;
2057 }
2058 
2059 /**
2060  * Decode the user data stuff in the header.
2061  * Also initializes divx/xvid/lavc_version/build.
2062  */
2063 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2064 {
2065  MpegEncContext *s = &ctx->m;
2066  char buf[256];
2067  int i;
2068  int e;
2069  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2070  char last;
2071 
2072  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2073  if (show_bits(gb, 23) == 0)
2074  break;
2075  buf[i] = get_bits(gb, 8);
2076  }
2077  buf[i] = 0;
2078 
2079  /* divx detection */
2080  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2081  if (e < 2)
2082  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2083  if (e >= 2) {
2084  ctx->divx_version = ver;
2085  ctx->divx_build = build;
2086  s->divx_packed = e == 3 && last == 'p';
2087  }
2088 
2089  /* libavcodec detection */
2090  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2091  if (e != 4)
2092  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2093  if (e != 4) {
2094  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2095  if (e > 1)
2096  build = (ver << 16) + (ver2 << 8) + ver3;
2097  }
2098  if (e != 4) {
2099  if (strcmp(buf, "ffmpeg") == 0)
2100  ctx->lavc_build = 4600;
2101  }
2102  if (e == 4)
2103  ctx->lavc_build = build;
2104 
2105  /* Xvid detection */
2106  e = sscanf(buf, "XviD%d", &build);
2107  if (e == 1)
2108  ctx->xvid_build = build;
2109 
2110  return 0;
2111 }
2112 
2113 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2114 {
2115  Mpeg4DecContext *ctx = avctx->priv_data;
2116  MpegEncContext *s = &ctx->m;
2117 
2118  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2119  if (s->codec_tag == AV_RL32("XVID") ||
2120  s->codec_tag == AV_RL32("XVIX") ||
2121  s->codec_tag == AV_RL32("RMP4") ||
2122  s->codec_tag == AV_RL32("ZMP4") ||
2123  s->codec_tag == AV_RL32("SIPP"))
2124  ctx->xvid_build = 0;
2125  }
2126 
2127  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2128  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2129  ctx->vol_control_parameters == 0)
2130  ctx->divx_version = 400; // divx 4
2131 
2132  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2133  ctx->divx_version =
2134  ctx->divx_build = -1;
2135  }
2136 
2137  if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2138  if (s->codec_tag == AV_RL32("XVIX"))
2139  s->workaround_bugs |= FF_BUG_XVID_ILACE;
2140 
2141  if (s->codec_tag == AV_RL32("UMP4"))
2142  s->workaround_bugs |= FF_BUG_UMP4;
2143 
2144  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2145  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2146 
2147  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2148  s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2149 
2150  if (ctx->xvid_build <= 3U)
2151  s->padding_bug_score = 256 * 256 * 256 * 64;
2152 
2153  if (ctx->xvid_build <= 1U)
2154  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2155 
2156  if (ctx->xvid_build <= 12U)
2157  s->workaround_bugs |= FF_BUG_EDGE;
2158 
2159  if (ctx->xvid_build <= 32U)
2160  s->workaround_bugs |= FF_BUG_DC_CLIP;
2161 
2162 #define SET_QPEL_FUNC(postfix1, postfix2) \
2163  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2164  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2165  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2166 
2167  if (ctx->lavc_build < 4653U)
2168  s->workaround_bugs |= FF_BUG_STD_QPEL;
2169 
2170  if (ctx->lavc_build < 4655U)
2171  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2172 
2173  if (ctx->lavc_build < 4670U)
2174  s->workaround_bugs |= FF_BUG_EDGE;
2175 
2176  if (ctx->lavc_build <= 4712U)
2177  s->workaround_bugs |= FF_BUG_DC_CLIP;
2178 
2179  if (ctx->divx_version >= 0)
2180  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2181  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2182  s->padding_bug_score = 256 * 256 * 256 * 64;
2183 
2184  if (ctx->divx_version < 500U)
2185  s->workaround_bugs |= FF_BUG_EDGE;
2186 
2187  if (ctx->divx_version >= 0)
2188  s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2189  }
2190 
2191  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2192  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2193  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2194  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2195  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2196  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2197  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2198 
2199  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2200  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2201  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2202  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2203  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2204  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2205  }
2206 
2207  if (avctx->debug & FF_DEBUG_BUGS)
2208  av_log(s->avctx, AV_LOG_DEBUG,
2209  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2210  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2211  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2212 
2213  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2214  s->codec_id == AV_CODEC_ID_MPEG4 &&
2215  avctx->idct_algo == FF_IDCT_AUTO) {
2216  avctx->idct_algo = FF_IDCT_XVID;
2217  ff_mpv_idct_init(s);
2218  return 1;
2219  }
2220 
2221  return 0;
2222 }
2223 
2224 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2225 {
2226  MpegEncContext *s = &ctx->m;
2227  int time_incr, time_increment;
2228  int64_t pts;
2229 
2230  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2231  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2232  ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2233  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2234  s->low_delay = 0;
2235  }
2236 
2237  s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2238  if (s->partitioned_frame)
2239  s->decode_mb = mpeg4_decode_partitioned_mb;
2240  else
2241  s->decode_mb = mpeg4_decode_mb;
2242 
2243  time_incr = 0;
2244  while (get_bits1(gb) != 0)
2245  time_incr++;
2246 
2247  check_marker(gb, "before time_increment");
2248 
2249  if (ctx->time_increment_bits == 0 ||
2250  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2251  av_log(s->avctx, AV_LOG_WARNING,
2252  "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);
2253 
2254  for (ctx->time_increment_bits = 1;
2255  ctx->time_increment_bits < 16;
2256  ctx->time_increment_bits++) {
2257  if (s->pict_type == AV_PICTURE_TYPE_P ||
2258  (s->pict_type == AV_PICTURE_TYPE_S &&
2259  ctx->vol_sprite_usage == GMC_SPRITE)) {
2260  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2261  break;
2262  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2263  break;
2264  }
2265 
2266  av_log(s->avctx, AV_LOG_WARNING,
2267  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2268  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2269  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2270  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2271  }
2272  }
2273 
2274  if (IS_3IV1)
2275  time_increment = get_bits1(gb); // FIXME investigate further
2276  else
2277  time_increment = get_bits(gb, ctx->time_increment_bits);
2278 
2279  if (s->pict_type != AV_PICTURE_TYPE_B) {
2280  s->last_time_base = s->time_base;
2281  s->time_base += time_incr;
2282  s->time = s->time_base * s->avctx->framerate.num + time_increment;
2283  if (s->workaround_bugs & FF_BUG_UMP4) {
2284  if (s->time < s->last_non_b_time) {
2285  /* header is not mpeg-4-compatible, broken encoder,
2286  * trying to workaround */
2287  s->time_base++;
2288  s->time += s->avctx->framerate.num;
2289  }
2290  }
2291  s->pp_time = s->time - s->last_non_b_time;
2292  s->last_non_b_time = s->time;
2293  } else {
2294  s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2295  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2296  if (s->pp_time <= s->pb_time ||
2297  s->pp_time <= s->pp_time - s->pb_time ||
2298  s->pp_time <= 0) {
2299  /* messed up order, maybe after seeking? skipping current b-frame */
2300  return FRAME_SKIPPED;
2301  }
2302  ff_mpeg4_init_direct_mv(s);
2303 
2304  if (ctx->t_frame == 0)
2305  ctx->t_frame = s->pb_time;
2306  if (ctx->t_frame == 0)
2307  ctx->t_frame = 1; // 1/0 protection
2308  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2309  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2310  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2311  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2312  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2313  s->pb_field_time = 2;
2314  s->pp_field_time = 4;
2315  if (!s->progressive_sequence)
2316  return FRAME_SKIPPED;
2317  }
2318  }
2319 
2320  if (s->avctx->framerate.den)
2321  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2322  else
2323  pts = AV_NOPTS_VALUE;
2324  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2325 
2326  check_marker(gb, "before vop_coded");
2327 
2328  /* vop coded */
2329  if (get_bits1(gb) != 1) {
2330  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2331  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2332  return FRAME_SKIPPED;
2333  }
2334  if (ctx->new_pred)
2335  decode_new_pred(ctx, gb);
2336 
2337  if (ctx->shape != BIN_ONLY_SHAPE &&
2338  (s->pict_type == AV_PICTURE_TYPE_P ||
2339  (s->pict_type == AV_PICTURE_TYPE_S &&
2340  ctx->vol_sprite_usage == GMC_SPRITE))) {
2341  /* rounding type for motion estimation */
2342  s->no_rounding = get_bits1(gb);
2343  } else {
2344  s->no_rounding = 0;
2345  }
2346  // FIXME reduced res stuff
2347 
2348  if (ctx->shape != RECT_SHAPE) {
2349  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2350  skip_bits(gb, 13); /* width */
2351  check_marker(gb, "after width");
2352  skip_bits(gb, 13); /* height */
2353  check_marker(gb, "after height");
2354  skip_bits(gb, 13); /* hor_spat_ref */
2355  check_marker(gb, "after hor_spat_ref");
2356  skip_bits(gb, 13); /* ver_spat_ref */
2357  }
2358  skip_bits1(gb); /* change_CR_disable */
2359 
2360  if (get_bits1(gb) != 0)
2361  skip_bits(gb, 8); /* constant_alpha_value */
2362  }
2363 
2364  // FIXME complexity estimation stuff
2365 
2366  if (ctx->shape != BIN_ONLY_SHAPE) {
2367  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2368  if (s->pict_type != AV_PICTURE_TYPE_I)
2369  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2370  if (s->pict_type == AV_PICTURE_TYPE_B)
2371  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2372 
2373  if (get_bits_left(gb) < 3) {
2374  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2375  return AVERROR_INVALIDDATA;
2376  }
2377  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2378  if (!s->progressive_sequence) {
2379  s->top_field_first = get_bits1(gb);
2380  s->alternate_scan = get_bits1(gb);
2381  } else
2382  s->alternate_scan = 0;
2383  }
2384 
2385  if (s->alternate_scan) {
2386  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2387  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2388  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2389  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2390  } else {
2391  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2392  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2393  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2394  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2395  }
2396 
2397  if (s->pict_type == AV_PICTURE_TYPE_S &&
2398  (ctx->vol_sprite_usage == STATIC_SPRITE ||
2399  ctx->vol_sprite_usage == GMC_SPRITE)) {
2400  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2401  return AVERROR_INVALIDDATA;
2402  if (ctx->sprite_brightness_change)
2403  av_log(s->avctx, AV_LOG_ERROR,
2404  "sprite_brightness_change not supported\n");
2405  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2406  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2407  }
2408 
2409  if (ctx->shape != BIN_ONLY_SHAPE) {
2410  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2411  if (s->qscale == 0) {
2412  av_log(s->avctx, AV_LOG_ERROR,
2413  "Error, header damaged or not MPEG4 header (qscale=0)\n");
2414  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2415  }
2416 
2417  if (s->pict_type != AV_PICTURE_TYPE_I) {
2418  s->f_code = get_bits(gb, 3); /* fcode_for */
2419  if (s->f_code == 0) {
2420  av_log(s->avctx, AV_LOG_ERROR,
2421  "Error, header damaged or not MPEG4 header (f_code=0)\n");
2422  s->f_code = 1;
2423  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2424  }
2425  } else
2426  s->f_code = 1;
2427 
2428  if (s->pict_type == AV_PICTURE_TYPE_B) {
2429  s->b_code = get_bits(gb, 3);
2430  if (s->b_code == 0) {
2431  av_log(s->avctx, AV_LOG_ERROR,
2432  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2433  s->b_code=1;
2434  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2435  }
2436  } else
2437  s->b_code = 1;
2438 
2439  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2440  av_log(s->avctx, AV_LOG_DEBUG,
2441  "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",
2442  s->qscale, s->f_code, s->b_code,
2443  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")),
2444  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2445  s->top_field_first, s->quarter_sample ? "q" : "h",
2446  s->data_partitioning, ctx->resync_marker,
2447  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2448  1 - s->no_rounding, s->vo_type,
2449  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2450  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2451  ctx->cplx_estimation_trash_b,
2452  s->time,
2453  time_increment
2454  );
2455  }
2456 
2457  if (!ctx->scalability) {
2458  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2459  skip_bits1(gb); // vop shape coding type
2460  } else {
2461  if (ctx->enhancement_type) {
2462  int load_backward_shape = get_bits1(gb);
2463  if (load_backward_shape)
2464  av_log(s->avctx, AV_LOG_ERROR,
2465  "load backward shape isn't supported\n");
2466  }
2467  skip_bits(gb, 2); // ref_select_code
2468  }
2469  }
2470  /* detect buggy encoders which don't set the low_delay flag
2471  * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2472  * easily (although it's buggy too) */
2473  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2474  ctx->divx_version == -1 && s->picture_number == 0) {
2475  av_log(s->avctx, AV_LOG_WARNING,
2476  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2477  s->low_delay = 1;
2478  }
2479 
2480  s->picture_number++; // better than pic number==0 always ;)
2481 
2482  // FIXME add short header support
2483  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2484  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2485 
2486  if (s->workaround_bugs & FF_BUG_EDGE) {
2487  s->h_edge_pos = s->width;
2488  s->v_edge_pos = s->height;
2489  }
2490  return 0;
2491 }
2492 
2493 /**
2494  * Decode mpeg4 headers.
2495  * @return <0 if no VOP found (or a damaged one)
2496  * FRAME_SKIPPED if a not coded VOP is found
2497  * 0 if a VOP is found
2498  */
2499 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2500 {
2501  MpegEncContext *s = &ctx->m;
2502  unsigned startcode, v;
2503  int ret;
2504 
2505  /* search next start code */
2506  align_get_bits(gb);
2507 
2508  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2509  skip_bits(gb, 24);
2510  if (get_bits(gb, 8) == 0xF0)
2511  goto end;
2512  }
2513 
2514  startcode = 0xff;
2515  for (;;) {
2516  if (get_bits_count(gb) >= gb->size_in_bits) {
2517  if (gb->size_in_bits == 8 &&
2518  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2519  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2520  return FRAME_SKIPPED; // divx bug
2521  } else
2522  return -1; // end of stream
2523  }
2524 
2525  /* use the bits after the test */
2526  v = get_bits(gb, 8);
2527  startcode = ((startcode << 8) | v) & 0xffffffff;
2528 
2529  if ((startcode & 0xFFFFFF00) != 0x100)
2530  continue; // no startcode
2531 
2532  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2533  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2534  if (startcode <= 0x11F)
2535  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2536  else if (startcode <= 0x12F)
2537  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2538  else if (startcode <= 0x13F)
2539  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2540  else if (startcode <= 0x15F)
2541  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2542  else if (startcode <= 0x1AF)
2543  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2544  else if (startcode == 0x1B0)
2545  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2546  else if (startcode == 0x1B1)
2547  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2548  else if (startcode == 0x1B2)
2549  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2550  else if (startcode == 0x1B3)
2551  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2552  else if (startcode == 0x1B4)
2553  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2554  else if (startcode == 0x1B5)
2555  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2556  else if (startcode == 0x1B6)
2557  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2558  else if (startcode == 0x1B7)
2559  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2560  else if (startcode == 0x1B8)
2561  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2562  else if (startcode == 0x1B9)
2563  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2564  else if (startcode == 0x1BA)
2565  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2566  else if (startcode == 0x1BB)
2567  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2568  else if (startcode == 0x1BC)
2569  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2570  else if (startcode == 0x1BD)
2571  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2572  else if (startcode == 0x1BE)
2573  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2574  else if (startcode == 0x1BF)
2575  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2576  else if (startcode == 0x1C0)
2577  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2578  else if (startcode == 0x1C1)
2579  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2580  else if (startcode == 0x1C2)
2581  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2582  else if (startcode == 0x1C3)
2583  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2584  else if (startcode <= 0x1C5)
2585  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2586  else if (startcode <= 0x1FF)
2587  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2588  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2589  }
2590 
2591  if (startcode >= 0x120 && startcode <= 0x12F) {
2592  if ((ret = decode_vol_header(ctx, gb)) < 0)
2593  return ret;
2594  } else if (startcode == USER_DATA_STARTCODE) {
2595  decode_user_data(ctx, gb);
2596  } else if (startcode == GOP_STARTCODE) {
2597  mpeg4_decode_gop_header(s, gb);
2598  } else if (startcode == VOS_STARTCODE) {
2599  mpeg4_decode_profile_level(s, gb);
2600  } else if (startcode == VOP_STARTCODE) {
2601  break;
2602  }
2603 
2604  align_get_bits(gb);
2605  startcode = 0xff;
2606  }
2607 
2608 end:
2609  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2610  s->low_delay = 1;
2611  s->avctx->has_b_frames = !s->low_delay;
2612 
2613  return decode_vop_header(ctx, gb);
2614 }
2615 
2616 av_cold void ff_mpeg4videodec_static_init(void) {
2617  static int done = 0;
2618 
2619  if (!done) {
2620  ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2621  ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2622  ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2623  INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2624  INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2625  INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2626  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2627  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2628  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2629  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2630  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2631  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2632  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2633  &ff_sprite_trajectory_tab[0][1], 4, 2,
2634  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2635  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2636  &ff_mb_type_b_tab[0][1], 2, 1,
2637  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2638  done = 1;
2639  }
2640 }
2641 
2642 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2643 {
2644  Mpeg4DecContext *ctx = avctx->priv_data;
2645  MpegEncContext *s = &ctx->m;
2646 
2647  /* divx 5.01+ bitstream reorder stuff */
2648  /* Since this clobbers the input buffer and hwaccel codecs still need the
2649  * data during hwaccel->end_frame we should not do this any earlier */
2650  if (s->divx_packed) {
2651  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2652  int startcode_found = 0;
2653 
2654  if (buf_size - current_pos > 7) {
2655 
2656  int i;
2657  for (i = current_pos; i < buf_size - 4; i++)
2658 
2659  if (buf[i] == 0 &&
2660  buf[i + 1] == 0 &&
2661  buf[i + 2] == 1 &&
2662  buf[i + 3] == 0xB6) {
2663  startcode_found = !(buf[i + 4] & 0x40);
2664  break;
2665  }
2666  }
2667 
2668  if (startcode_found) {
2669  if (!ctx->showed_packed_warning) {
2670  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2671  "wasteful way to store B-frames ('packed B-frames'). "
2672  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2673  ctx->showed_packed_warning = 1;
2674  }
2675  av_fast_padded_malloc(&s->bitstream_buffer,
2676  &s->allocated_bitstream_buffer_size,
2677  buf_size - current_pos);
2678  if (!s->bitstream_buffer) {
2679  s->bitstream_buffer_size = 0;
2680  return AVERROR(ENOMEM);
2681  }
2682  memcpy(s->bitstream_buffer, buf + current_pos,
2683  buf_size - current_pos);
2684  s->bitstream_buffer_size = buf_size - current_pos;
2685  }
2686  }
2687 
2688  return 0;
2689 }
2690 
2691 static int mpeg4_update_thread_context(AVCodecContext *dst,
2692  const AVCodecContext *src)
2693 {
2694  Mpeg4DecContext *s = dst->priv_data;
2695  const Mpeg4DecContext *s1 = src->priv_data;
2696  int init = s->m.context_initialized;
2697 
2698  int ret = ff_mpeg_update_thread_context(dst, src);
2699 
2700  if (ret < 0)
2701  return ret;
2702 
2703  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2704 
2705  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2706  ff_xvid_idct_init(&s->m.idsp, dst);
2707 
2708  return 0;
2709 }
2710 
2711 static av_cold int decode_init(AVCodecContext *avctx)
2712 {
2713  Mpeg4DecContext *ctx = avctx->priv_data;
2714  MpegEncContext *s = &ctx->m;
2715  int ret;
2716 
2717  ctx->divx_version =
2718  ctx->divx_build =
2719  ctx->xvid_build =
2720  ctx->lavc_build = -1;
2721 
2722  if ((ret = ff_h263_decode_init(avctx)) < 0)
2723  return ret;
2724 
2725  ff_mpeg4videodec_static_init();
2726 
2727  s->h263_pred = 1;
2728  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2729  s->decode_mb = mpeg4_decode_mb;
2730  ctx->time_increment_bits = 4; /* default value for broken headers */
2731 
2732  avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2733  avctx->internal->allocate_progress = 1;
2734 
2735  return 0;
2736 }
2737 
2738 static const AVProfile mpeg4_video_profiles[] = {
2739  { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2740  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2741  { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2742  { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2743  { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2744  { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2745  { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2746  { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2747  { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2748  { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2749  { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2750  { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2751  { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2752  { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2753  { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2754  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2755  { FF_PROFILE_UNKNOWN },
2756 };
2757 
2758 static const AVOption mpeg4_options[] = {
2759  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2760  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2761  {NULL}
2762 };
2763 
2764 static const AVClass mpeg4_class = {
2765  "MPEG4 Video Decoder",
2766  av_default_item_name,
2767  mpeg4_options,
2768  LIBAVUTIL_VERSION_INT,
2769 };
2770 
2771 AVCodec ff_mpeg4_decoder = {
2772  .name = "mpeg4",
2773  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2774  .type = AVMEDIA_TYPE_VIDEO,
2775  .id = AV_CODEC_ID_MPEG4,
2776  .priv_data_size = sizeof(Mpeg4DecContext),
2777  .init = decode_init,
2778  .close = ff_h263_decode_end,
2779  .decode = ff_h263_decode_frame,
2780  .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2781  AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2782  AV_CODEC_CAP_FRAME_THREADS,
2783  .flush = ff_mpeg_flush,
2784  .max_lowres = 3,
2785  .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2786  .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2787  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2788  .priv_class = &mpeg4_class,
2789 };
2790 
2791 
2792 #if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
2793 static const AVClass mpeg4_vdpau_class = {
2794  "MPEG4 Video VDPAU Decoder",
2795  av_default_item_name,
2796  mpeg4_options,
2797  LIBAVUTIL_VERSION_INT,
2798 };
2799 
2800 AVCodec ff_mpeg4_vdpau_decoder = {
2801  .name = "mpeg4_vdpau",
2802  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2803  .type = AVMEDIA_TYPE_VIDEO,
2804  .id = AV_CODEC_ID_MPEG4,
2805  .priv_data_size = sizeof(Mpeg4DecContext),
2806  .init = decode_init,
2807  .close = ff_h263_decode_end,
2808  .decode = ff_h263_decode_frame,
2809  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2810  AV_CODEC_CAP_HWACCEL_VDPAU,
2811  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2812  AV_PIX_FMT_NONE },
2813  .priv_class = &mpeg4_vdpau_class,
2814 };
2815 #endif
FF_PROFILE_MPEG4_SCALABLE_TEXTURE
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Definition: avcodec.h:3171
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Definition: mpegvideo.h:421
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Definition: get_bits.h:383
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consider things that a sane encoder should not do as an error
Definition: avcodec.h:2906
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Definition: get_bits.h:55
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Definition: mpegvideo.h:416
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Definition: pthread_frame.c:514
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Definition: avcodec.h:3472
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Definition: rl.h:38
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Definition: mpegvideo.h:211
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Definition: mpegvideo.h:405
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Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:2420
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This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1631
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Definition: mpeg4video.h:71
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Definition: mpeg4videodec.c:2113
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#define USER_DATA_STARTCODE
Definition: mpeg4video.h:57
MpegEncContext::mb_num_left
int mb_num_left
number of MBs left in this video packet (for partitioned Slices only)
Definition: mpegvideo.h:366
RLTable::max_run
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:46
FF_BUG_UMP4
#define FF_BUG_UMP4
Definition: avcodec.h:2792
MV_DIRECT
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4) ...
Definition: mpegvideo.h:272
bits
uint8_t bits
Definition: crc.c:295
uint8_t
uint8_t
Definition: audio_convert.c:194
av_cold
#define av_cold
Definition: attributes.h:74
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:63
mpeg4_decode_mb
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: mpeg4videodec.c:1297
delta
float delta
Definition: vorbis_enc_data.h:457
opt.h
AVOptions.
INIT_VLC_STATIC
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:476
ff_mpeg4_resync_prefix
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
ff_sprite_trajectory_tab
const uint16_t ff_sprite_trajectory_tab[15][2]
Definition: mpeg4data.h:326
VOP_STARTCODE
#define VOP_STARTCODE
Definition: mpeg4video.h:60
end
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
BIN_ONLY_SHAPE
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
IS_3IV1
#define IS_3IV1
Definition: mpeg4video.h:171
MpegEncContext::pred_dir_table
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:207
thread.h
Multithreading support functions.
AV_CODEC_FLAG_LOW_DELAY
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:780
FF_PROFILE_UNKNOWN
#define FF_PROFILE_UNKNOWN
Definition: avcodec.h:3116
MpegEncContext::interlaced_dct
int interlaced_dct
Definition: mpegvideo.h:484
MpegEncContext::current_picture
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:187
CHROMA_420
#define CHROMA_420
Definition: mpegvideo.h:476
ff_mpeg4_DCtab_chrom
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
RECT_SHAPE
#define RECT_SHAPE
Definition: mpeg4video.h:33
decode_user_data
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
Definition: mpeg4videodec.c:2063
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
FF_BUG_NO_PADDING
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2793
RLTable::max_level
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:45
AV_CODEC_CAP_HWACCEL_VDPAU
#define AV_CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:893
ER_MV_END
#define ER_MV_END
Definition: error_resilience.h:36
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
ff_mpv_idct_init
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:321
MpegEncContext::mb_height
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:136
MpegEncContext::codec_tag
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:127
Mpeg4DecContext::intra_dc_threshold
int intra_dc_threshold
QP above which the ac VLC should be used for intra dc.
Definition: mpeg4video.h:92
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2244
MAX_LEVEL
#define MAX_LEVEL
Definition: rl.h:35
FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE
#define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE
Definition: avcodec.h:3173
ff_mpeg4_pred_dc
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:181
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
MOTION_MARKER
#define MOTION_MARKER
Definition: mpeg4video.h:53
ff_update_block_index
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:681
ff_set_qscale
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2791
Mpeg4DecContext::m
MpegEncContext m
Definition: mpeg4video.h:66
MpegEncContext::sprite_offset
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:402
ROUNDED_DIV
#define ROUNDED_DIV(a, b)
Definition: common.h:55
FF_BUG_QPEL_CHROMA
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2798
Picture::tf
ThreadFrame tf
Definition: mpegpicture.h:47
AV_EF_IGNORE_ERR
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2903
ff_xvid_idct_init
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333
U
#define U(x)
Definition: vp56_arith.h:37
FF_BUG_DIRECT_BLOCKSIZE
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2801
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:588
MpegEncContext::dc_val
int16_t * dc_val[3]
used for mpeg4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:194
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:173
alpha
static double alpha(void *priv, double x, double y)
Definition: vf_geq.c:99
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVCodecContext::has_b_frames
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1812
Picture::mbskip_table
uint8_t * mbskip_table
Definition: mpegpicture.h:59
ff_er_add_slice
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
Definition: error_resilience.c:797
MpegEncContext::mb_skipped
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:202
av_default_item_name
av_default_item_name
Definition: libopenh264enc.c:59
MpegEncContext::partitioned_frame
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:410
STATIC_SPRITE
#define STATIC_SPRITE
Definition: mpeg4video.h:50
ff_mpeg4_decode_partitions
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
Definition: mpeg4videodec.c:878
AVERROR
#define AVERROR(e)
Definition: error.h:43
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
MpegEncContext::er
ERContext er
Definition: mpegvideo.h:553
get_amv
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
Definition: mpeg4videodec.c:491
r
const char * r
Definition: vf_curves.c:107
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1597
INTER_MCBPC_VLC_BITS
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:40
FF_BUG_AUTODETECT
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2787
length
GLsizei GLsizei * length
Definition: opengl_enc.c:115
ff_mpeg4_init_direct_mv
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:71
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3479
IS_SKIP
#define IS_SKIP(a)
Definition: mpegutils.h:77
FF_PROFILE_MPEG4_SIMPLE_SCALABLE
#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE
Definition: avcodec.h:3167
MpegEncContext::quarter_sample
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:406
MpegEncContext::low_delay
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:411
SET_QPEL_FUNC
#define SET_QPEL_FUNC(postfix1, postfix2)
MpegEncContext::gb
GetBitContext gb
Definition: mpegvideo.h:451
FF_PROFILE_MPEG4_ADVANCED_REAL_TIME
#define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME
Definition: avcodec.h:3175
MpegEncContext::decode_mb
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:502
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:144
FF_PROFILE_MPEG4_HYBRID
#define FF_PROFILE_MPEG4_HYBRID
Definition: avcodec.h:3174
INIT_VLC_RL
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:920
check_marker
static int check_marker(GetBitContext *s, const char *msg)
Definition: get_bits.h:393
VLC
Definition: get_bits.h:63
ff_mpeg_flush
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2760
SKIP_BITS
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:188
ONLY_IF_THREADS_ENABLED
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:214
MpegEncContext::resync_mb_x
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:363
ff_alternate_horizontal_scan
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideodata.c:82
ff_h263_decode_init
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:62
internal.h
common internal API header
FF_DEBUG_STARTCODE
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2856
MpegEncContext::sprite_delta
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:403
ff_mpeg4_DCtab_lum
const uint8_t ff_mpeg4_DCtab_lum[13][2]
Definition: mpeg4data.h:35
ff_mpeg4_static_rl_table_store
uint8_t ff_mpeg4_static_rl_table_store[3][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg4video.c:28
MB_TYPE_GMC
#define MB_TYPE_GMC
Definition: avcodec.h:1151
ff_h263_inter_MCBPC_vlc
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:99
ff_h263_decode_frame
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:409
AV_CODEC_CAP_DRAW_HORIZ_BAND
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:851
mpeg4_decode_sprite_trajectory
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:167
AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:266
mb_type_b_map
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:50
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2890
FF_PROFILE_MPEG4_SIMPLE
#define FF_PROFILE_MPEG4_SIMPLE
Definition: avcodec.h:3166
MB_TYPE_DIRECT2
#define MB_TYPE_DIRECT2
Definition: avcodec.h:1149
FFMIN
#define FFMIN(a, b)
Definition: common.h:81
y
float y
Definition: avf_showspectrum.c:96
ff_mpeg4_y_dc_scale_table
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
IS_DIRECT
#define IS_DIRECT(a)
Definition: mpegutils.h:80
dc_lum
static VLC dc_lum
Definition: mpeg4videodec.c:46
mpeg4_decode_partition_a
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
Definition: mpeg4videodec.c:591
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2961
mpeg4_decode_dc
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
Definition: mpeg4videodec.c:544
MB_TYPE_INTERLACED
#define MB_TYPE_INTERLACED
Definition: avcodec.h:1148
Picture::motion_val
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
GRAY_SHAPE
#define GRAY_SHAPE
Definition: mpeg4video.h:36
ER_DC_END
#define ER_DC_END
Definition: error_resilience.h:35
ff_h263_hwaccel_pixfmt_list_420
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:721
ff_mpeg4_decoder
AVCodec ff_mpeg4_decoder
Definition: mpeg4videodec.c:2771
MpegEncContext::allocated_bitstream_buffer_size
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:422
GetBitContext::size_in_bits
int size_in_bits
Definition: get_bits.h:57
Mpeg4DecContext::use_intra_dc_vlc
int use_intra_dc_vlc
Definition: mpeg4video.h:89
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:287
MB_TYPE_L0L1
#define MB_TYPE_L0L1
Definition: avcodec.h:1159
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:68
AVCodecContext::level
int level
level
Definition: avcodec.h:3204
ff_mpeg4_decode_video_packet_header
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
Definition: mpeg4videodec.c:397
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:194
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:555
MpegEncContext::block_last_index
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:93
n
int n
Definition: avisynth_c.h:547
MB_TYPE_ACPRED
#define MB_TYPE_ACPRED
Definition: avcodec.h:1150
IDCTDSPContext::idct_permutation
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
AVCodecContext::ticks_per_frame
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1640
MB_TYPE_L1
#define MB_TYPE_L1
Definition: avcodec.h:1158
Mpeg4DecContext::vol_control_parameters
int vol_control_parameters
does the stream contain the low_delay flag, used to work around buggy encoders.
Definition: mpeg4video.h:104
ff_mpeg4_default_non_intra_matrix
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:348
MpegEncContext::mbintra_table
uint8_t * mbintra_table
used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
Definition: mpegvideo.h:205
ff_mpeg_update_thread_context
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:474
RLTable::rl_vlc
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:47
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:206
SPRITE_TRAJ_VLC_BITS
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:42
MpegEncContext::block_index
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:301
av_log2
#define av_log2
Definition: intmath.h:100
MV_TYPE_16X16
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:274
MpegEncContext::first_slice_line
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:439
FF_IDCT_AUTO
#define FF_IDCT_AUTO
Definition: avcodec.h:2962
mpeg4_decode_partitioned_mb
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
decode partition C of one MB.
Definition: mpeg4videodec.c:1212
MV_DIR_BACKWARD
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:271
FF_PROFILE_MPEG4_CORE
#define FF_PROFILE_MPEG4_CORE
Definition: avcodec.h:3168
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
profiles
static const AVProfile profiles[]
Definition: aacdec_template.c:3219
src
AVS_Value src
Definition: avisynth_c.h:482
MpegEncContext::bdsp
BlockDSPContext bdsp
Definition: mpegvideo.h:233
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:2842
error_resilience.h
AVCodecContext
main external API structure.
Definition: avcodec.h:1502
decode_vop_header
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:2224
FASTDIV
#define FASTDIV(a, b)
Definition: mathops.h:210
RSHIFT
#define RSHIFT(a, b)
Definition: common.h:53
MpegEncContext::intra_scantable
ScanTable intra_scantable
Definition: mpegvideo.h:98
MpegEncContext::height
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:107
get_xbits
static int get_xbits(GetBitContext *s, int n)
read mpeg1 dc style vlc (sign bit + mantissa with no MSB).
Definition: get_bits.h:231
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:133
ff_rl_init
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:37
FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE
#define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE
Definition: avcodec.h:3179
buf
void * buf
Definition: avisynth_c.h:553
AV_PIX_FMT_VDPAU_MPEG4
MPEG4 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstre...
Definition: pixfmt.h:147
SLICE_END
#define SLICE_END
end marker found
Definition: mpegvideo.h:505
MpegEncContext::data_partitioning
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:409
Mpeg4DecContext::showed_packed_warning
int showed_packed_warning
flag for having shown the warning about invalid Divx B-frames
Definition: mpeg4video.h:101
MpegEncContext::progressive_sequence
int progressive_sequence
Definition: mpegvideo.h:459
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
height
BYTE int const BYTE int int int height
Definition: avisynth_c.h:676
skip_bits1
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:329
mpeg4_update_thread_context
static int mpeg4_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpeg4videodec.c:2691
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
MpegEncContext::intra_h_scantable
ScanTable intra_h_scantable
Definition: mpegvideo.h:99
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:297
mpeg4_video_profiles
static const AVProfile mpeg4_video_profiles[]
Definition: mpeg4videodec.c:2738
MpegEncContext::cbp_table
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:206
FF_BUG_XVID_ILACE
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2791
AVRational
rational number numerator/denominator
Definition: rational.h:43
ff_mpeg4_decode_picture_header
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode mpeg4 headers.
Definition: mpeg4videodec.c:2499
MpegEncContext::context_initialized
int context_initialized
Definition: mpegvideo.h:131
GET_CACHE
#define GET_CACHE(name, gb)
Definition: get_bits.h:210
MB_TYPE_16x16
#define MB_TYPE_16x16
Definition: avcodec.h:1144
FF_BUG_DC_CLIP
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2804
ff_h263_rl_inter
RLTable ff_h263_rl_inter
Definition: h263data.c:161
ff_zigzag_direct
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
s1
#define s1
Definition: regdef.h:38
SKIP_CACHE
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:175
ff_mpeg4_default_intra_matrix
const int16_t ff_mpeg4_default_intra_matrix[64]
Definition: mpeg4data.h:337
ER_DC_ERROR
#define ER_DC_ERROR
Definition: error_resilience.h:32
AVCodecInternal::allocate_progress
int allocate_progress
Whether to allocate progress for frame threading.
Definition: internal.h:115
MpegEncContext::f_code
int f_code
forward MV resolution
Definition: mpegvideo.h:245
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:337
ff_mpeg4_set_direct_mv
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
FF_IDCT_XVID
#define FF_IDCT_XVID
Definition: avcodec.h:2975
Mpeg4DecContext::sprite_shift
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:77
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:270
MpegEncContext::pict_type
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:219
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:209
AV_CODEC_CAP_TRUNCATED
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:858
ff_mpeg4_dc_threshold
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
MpegEncContext::h263_pred
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:112
pts
static int64_t pts
Global timestamp for the audio frames.
Definition: transcode_aac.c:547
ff_mpeg4_get_video_packet_prefix_length
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
FF_BUG_HPEL_CHROMA
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2803
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:133
ff_h263_pixel_aspect
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
FF_ASPECT_EXTENDED
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1699
level
uint8_t level
Definition: svq3.c:150
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2843
MpegEncContext::mv
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:284
MpegEncContext::b8_stride
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:138
FF_BUG_AMV
#define FF_BUG_AMV
Definition: avcodec.h:2794
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:88
MpegEncContext::next_picture_ptr
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:190
Picture::qscale_table
int8_t * qscale_table
Definition: mpegpicture.h:50
MAX_RUN
#define MAX_RUN
Definition: rl.h:34
MpegEncContext::avctx
struct AVCodecContext * avctx
Definition: mpegvideo.h:105
mpeg4_is_resync
static int mpeg4_is_resync(Mpeg4DecContext *ctx)
check if the next stuff is a resync marker or the end.
Definition: mpeg4videodec.c:117
decode
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:523
SHOW_SBITS
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:207
sprite_trajectory
static VLC sprite_trajectory
Definition: mpeg4videodec.c:47
stride
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
mpeg4_options
static const AVOption mpeg4_options[]
Definition: mpeg4videodec.c:2758
internal.h
common internal api header.
MpegEncContext::mb_stride
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:137
if
if(ret< 0)
Definition: vf_mcdeint.c:280
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dv.h:93
dc_chrom
static VLC dc_chrom
Definition: mpeg4videodec.c:46
MB_TYPE_8x8
#define MB_TYPE_8x8
Definition: avcodec.h:1147
AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:268
AVProfile
AVProfile.
Definition: avcodec.h:3460
AV_EF_BITSTREAM
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2899
mb_type_b_vlc
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:48
mpeg4_decode_partition_b
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
Definition: mpeg4videodec.c:785
AVRational::den
int den
denominator
Definition: rational.h:45
ff_alternate_vertical_scan
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideodata.c:93
MB_TYPE_16x8
#define MB_TYPE_16x8
Definition: avcodec.h:1145
mpeg4_class
static const AVClass mpeg4_class
Definition: mpeg4videodec.c:2764
IS_INTRA
#define IS_INTRA(x, y)
ff_h263_decode_end
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:149
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1544
re
float re
Definition: fft-test.c:73
ff_init_scantable
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
IS_8X8
#define IS_8X8(a)
Definition: mpegutils.h:85
len
int len
Definition: vorbis_enc_data.h:452
AVCodecContext::internal
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1552
MpegEncContext::resync_mb_y
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:364
MpegEncContext::block
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:500
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
FF_DEBUG_BUGS
#define FF_DEBUG_BUGS
Definition: avcodec.h:2862
MpegEncContext::next_picture
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:175
IS_ACPRED
#define IS_ACPRED(a)
Definition: mpegutils.h:90
decode_new_pred
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:382
AV_EF_COMPLIANT
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2905
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:449
mpeg4_decode_profile_level
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
Definition: mpeg4videodec.c:1698
MpegEncContext::chroma_qscale
int chroma_qscale
chroma QP
Definition: mpegvideo.h:212
dc
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
Definition: audio_convert.c:194
ff_h263_decode_motion
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:254
av_uninit
#define av_uninit(x)
Definition: attributes.h:141
ff_rvlc_rl_intra
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
FF_PROFILE_MPEG4_SIMPLE_STUDIO
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO
Definition: avcodec.h:3180
Picture::mb_type
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
Mpeg4DecContext::time_increment_bits
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:69
MpegEncContext::workaround_bugs
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:126
FRAME_SKIPPED
#define FRAME_SKIPPED
return value for header parsers if frame is not coded
Definition: mpegvideo.h:61
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:193
FF_PROFILE_MPEG4_ADVANCED_CODING
#define FF_PROFILE_MPEG4_ADVANCED_CODING
Definition: avcodec.h:3177
Mpeg4DecContext::num_sprite_warping_points
int num_sprite_warping_points
Definition: mpeg4video.h:73
stride
#define stride
MV_TYPE_8X8
#define MV_TYPE_8X8
4 vectors (h263, mpeg4 4MV)
Definition: mpegvideo.h:275
MpegEncContext::b_code
int b_code
backward MV resolution for B Frames (mpeg4)
Definition: mpegvideo.h:246
FF_BUG_EDGE
#define FF_BUG_EDGE
Definition: avcodec.h:2802
FF_PROFILE_MPEG4_CORE_SCALABLE
#define FF_PROFILE_MPEG4_CORE_SCALABLE
Definition: avcodec.h:3176
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
ff_mb_type_b_tab
const uint8_t ff_mb_type_b_tab[4][2]
Definition: mpeg4data.h:332
mpeg4_decode_block
static int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block, int n, int coded, int intra, int rvlc)
Decode a block.
Definition: mpeg4videodec.c:941
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:857
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
MB_TYPE_L0
#define MB_TYPE_L0
Definition: avcodec.h:1157
FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION
#define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION
Definition: avcodec.h:3172
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:267
INTRA_MCBPC_VLC_BITS
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:39
GOP_STARTCODE
#define GOP_STARTCODE
Definition: mpeg4video.h:58
a
a
Definition: h264pred_template.c:468
VOS_STARTCODE
#define VOS_STARTCODE
Definition: mpeg4video.h:56
width
static int width
Definition: demuxing_decoding.c:39
GMC_SPRITE
#define GMC_SPRITE
Definition: mpeg4video.h:51
block
static int16_t block[64]
Definition: dct-test.c:110
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