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mpeg4videodec.c
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1 /*
2  * MPEG-4 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define UNCHECKED_BITSTREAM_READER 1
24 
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "error_resilience.h"
28 #include "idctdsp.h"
29 #include "internal.h"
30 #include "mpegutils.h"
31 #include "mpegvideo.h"
32 #include "mpegvideodata.h"
33 #include "mpeg4video.h"
34 #include "h263.h"
35 #include "profiles.h"
36 #include "thread.h"
37 #include "xvididct.h"
38 
39 /* The defines below define the number of bits that are read at once for
40  * reading vlc values. Changing these may improve speed and data cache needs
41  * be aware though that decreasing them may need the number of stages that is
42  * passed to get_vlc* to be increased. */
43 #define SPRITE_TRAJ_VLC_BITS 6
44 #define DC_VLC_BITS 9
45 #define MB_TYPE_B_VLC_BITS 4
46 
47 static VLC dc_lum, dc_chrom;
48 static VLC sprite_trajectory;
49 static VLC mb_type_b_vlc;
50 
51 static const int mb_type_b_map[4] = {
52  MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
53  MB_TYPE_L0L1 | MB_TYPE_16x16,
54  MB_TYPE_L1 | MB_TYPE_16x16,
55  MB_TYPE_L0 | MB_TYPE_16x16,
56 };
57 
58 /**
59  * Predict the ac.
60  * @param n block index (0-3 are luma, 4-5 are chroma)
61  * @param dir the ac prediction direction
62  */
63 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
64 {
65  int i;
66  int16_t *ac_val, *ac_val1;
67  int8_t *const qscale_table = s->current_picture.qscale_table;
68 
69  /* find prediction */
70  ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
71  ac_val1 = ac_val;
72  if (s->ac_pred) {
73  if (dir == 0) {
74  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
75  /* left prediction */
76  ac_val -= 16;
77 
78  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
79  n == 1 || n == 3) {
80  /* same qscale */
81  for (i = 1; i < 8; i++)
82  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
83  } else {
84  /* different qscale, we must rescale */
85  for (i = 1; i < 8; i++)
86  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
87  }
88  } else {
89  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
90  /* top prediction */
91  ac_val -= 16 * s->block_wrap[n];
92 
93  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
94  n == 2 || n == 3) {
95  /* same qscale */
96  for (i = 1; i < 8; i++)
97  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
98  } else {
99  /* different qscale, we must rescale */
100  for (i = 1; i < 8; i++)
101  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
102  }
103  }
104  }
105  /* left copy */
106  for (i = 1; i < 8; i++)
107  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
108 
109  /* top copy */
110  for (i = 1; i < 8; i++)
111  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
112 }
113 
114 /**
115  * check if the next stuff is a resync marker or the end.
116  * @return 0 if not
117  */
118 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
119 {
120  MpegEncContext *s = &ctx->m;
121  int bits_count = get_bits_count(&s->gb);
122  int v = show_bits(&s->gb, 16);
123 
124  if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
125  return 0;
126 
127  while (v <= 0xFF) {
128  if (s->pict_type == AV_PICTURE_TYPE_B ||
129  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
130  break;
131  skip_bits(&s->gb, 8 + s->pict_type);
132  bits_count += 8 + s->pict_type;
133  v = show_bits(&s->gb, 16);
134  }
135 
136  if (bits_count + 8 >= s->gb.size_in_bits) {
137  v >>= 8;
138  v |= 0x7F >> (7 - (bits_count & 7));
139 
140  if (v == 0x7F)
141  return s->mb_num;
142  } else {
143  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
144  int len, mb_num;
145  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
146  GetBitContext gb = s->gb;
147 
148  skip_bits(&s->gb, 1);
149  align_get_bits(&s->gb);
150 
151  for (len = 0; len < 32; len++)
152  if (get_bits1(&s->gb))
153  break;
154 
155  mb_num = get_bits(&s->gb, mb_num_bits);
156  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
157  mb_num= -1;
158 
159  s->gb = gb;
160 
161  if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
162  return mb_num;
163  }
164  }
165  return 0;
166 }
167 
168 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
169 {
170  MpegEncContext *s = &ctx->m;
171  int a = 2 << s->sprite_warping_accuracy;
172  int rho = 3 - s->sprite_warping_accuracy;
173  int r = 16 / a;
174  int alpha = 1;
175  int beta = 0;
176  int w = s->width;
177  int h = s->height;
178  int min_ab, i, w2, h2, w3, h3;
179  int sprite_ref[4][2];
180  int virtual_ref[2][2];
181  int64_t sprite_offset[2][2];
182  int64_t sprite_delta[2][2];
183 
184  // only true for rectangle shapes
185  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
186  { 0, s->height }, { s->width, s->height } };
187  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
188 
189  if (w <= 0 || h <= 0)
190  return AVERROR_INVALIDDATA;
191 
192  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
193  int length;
194  int x = 0, y = 0;
195 
196  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
197  if (length > 0)
198  x = get_xbits(gb, length);
199 
200  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
201  check_marker(s->avctx, gb, "before sprite_trajectory");
202 
203  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
204  if (length > 0)
205  y = get_xbits(gb, length);
206 
207  check_marker(s->avctx, gb, "after sprite_trajectory");
208  ctx->sprite_traj[i][0] = d[i][0] = x;
209  ctx->sprite_traj[i][1] = d[i][1] = y;
210  }
211  for (; i < 4; i++)
212  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
213 
214  while ((1 << alpha) < w)
215  alpha++;
216  while ((1 << beta) < h)
217  beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
218  w2 = 1 << alpha;
219  h2 = 1 << beta;
220 
221  // Note, the 4th point isn't used for GMC
222  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
223  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
224  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
225  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
226  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
227  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
228  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
229  } else {
230  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
231  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
232  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
233  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
234  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
235  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
236  }
237  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
238  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
239 
240  /* This is mostly identical to the MPEG-4 std (and is totally unreadable
241  * because of that...). Perhaps it should be reordered to be more readable.
242  * The idea behind this virtual_ref mess is to be able to use shifts later
243  * per pixel instead of divides so the distance between points is converted
244  * from w&h based to w2&h2 based which are of the 2^x form. */
245  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
246  ROUNDED_DIV(((w - w2) *
247  (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
248  w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
249  virtual_ref[0][1] = 16 * vop_ref[0][1] +
250  ROUNDED_DIV(((w - w2) *
251  (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
252  w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
253  virtual_ref[1][0] = 16 * vop_ref[0][0] +
254  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
255  h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
256  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
257  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
258  h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
259 
260  switch (ctx->num_sprite_warping_points) {
261  case 0:
262  sprite_offset[0][0] =
263  sprite_offset[0][1] =
264  sprite_offset[1][0] =
265  sprite_offset[1][1] = 0;
266  sprite_delta[0][0] = a;
267  sprite_delta[0][1] =
268  sprite_delta[1][0] = 0;
269  sprite_delta[1][1] = a;
270  ctx->sprite_shift[0] =
271  ctx->sprite_shift[1] = 0;
272  break;
273  case 1: // GMC only
274  sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
275  sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
276  sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
277  a * (vop_ref[0][0] / 2);
278  sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
279  a * (vop_ref[0][1] / 2);
280  sprite_delta[0][0] = a;
281  sprite_delta[0][1] =
282  sprite_delta[1][0] = 0;
283  sprite_delta[1][1] = a;
284  ctx->sprite_shift[0] =
285  ctx->sprite_shift[1] = 0;
286  break;
287  case 2:
288  sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
289  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
290  ((int64_t) -vop_ref[0][0]) +
291  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
292  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
293  sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
294  ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
295  ((int64_t) -vop_ref[0][0]) +
296  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
297  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
298  sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
299  ((int64_t)-2 * vop_ref[0][0] + 1) +
300  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
301  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
302  (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
303  sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
304  ((int64_t)-2 * vop_ref[0][0] + 1) +
305  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
306  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
307  (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
308  sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
309  sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
310  sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
311  sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
312 
313  ctx->sprite_shift[0] = alpha + rho;
314  ctx->sprite_shift[1] = alpha + rho + 2;
315  break;
316  case 3:
317  min_ab = FFMIN(alpha, beta);
318  w3 = w2 >> min_ab;
319  h3 = h2 >> min_ab;
320  sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
321  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
322  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
323  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
324  sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
325  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
326  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
327  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
328  sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
329  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
330  (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
331  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
332  sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
333  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
334  (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
335  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
336  sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
337  sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
338  sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
339  sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
340 
341  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
342  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
343  break;
344  }
345  /* try to simplify the situation */
346  if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
347  sprite_delta[0][1] == 0 &&
348  sprite_delta[1][0] == 0 &&
349  sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
350  sprite_offset[0][0] >>= ctx->sprite_shift[0];
351  sprite_offset[0][1] >>= ctx->sprite_shift[0];
352  sprite_offset[1][0] >>= ctx->sprite_shift[1];
353  sprite_offset[1][1] >>= ctx->sprite_shift[1];
354  sprite_delta[0][0] = a;
355  sprite_delta[0][1] = 0;
356  sprite_delta[1][0] = 0;
357  sprite_delta[1][1] = a;
358  ctx->sprite_shift[0] = 0;
359  ctx->sprite_shift[1] = 0;
360  s->real_sprite_warping_points = 1;
361  } else {
362  int shift_y = 16 - ctx->sprite_shift[0];
363  int shift_c = 16 - ctx->sprite_shift[1];
364 
365  for (i = 0; i < 2; i++) {
366  if (shift_c < 0 || shift_y < 0 ||
367  FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
368  FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
369  FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
370  FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
371  ) {
372  avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
373  goto overflow;
374  }
375  }
376 
377  for (i = 0; i < 2; i++) {
378  sprite_offset[0][i] *= 1 << shift_y;
379  sprite_offset[1][i] *= 1 << shift_c;
380  sprite_delta[0][i] *= 1 << shift_y;
381  sprite_delta[1][i] *= 1 << shift_y;
382  ctx->sprite_shift[i] = 16;
383 
384  }
385  for (i = 0; i < 2; i++) {
386  int64_t sd[2] = {
387  sprite_delta[i][0] - a * (1LL<<16),
388  sprite_delta[i][1] - a * (1LL<<16)
389  };
390 
391  if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
392  llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
393  llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
394  llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
395  llabs(sprite_delta[i][1] * (w+16LL)) >= INT_MAX ||
396  llabs(sd[0]) >= INT_MAX ||
397  llabs(sd[1]) >= INT_MAX ||
398  llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
399  llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
400  llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
401  ) {
402  avpriv_request_sample(s->avctx, "Overflow on sprite points");
403  goto overflow;
404  }
405  }
406  s->real_sprite_warping_points = ctx->num_sprite_warping_points;
407  }
408 
409  for (i = 0; i < 4; i++) {
410  s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
411  s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
412  }
413 
414  return 0;
415 overflow:
416  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
417  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
418  return AVERROR_PATCHWELCOME;
419 }
420 
421 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
422  MpegEncContext *s = &ctx->m;
423  int len = FFMIN(ctx->time_increment_bits + 3, 15);
424 
425  get_bits(gb, len);
426  if (get_bits1(gb))
427  get_bits(gb, len);
428  check_marker(s->avctx, gb, "after new_pred");
429 
430  return 0;
431 }
432 
433 /**
434  * Decode the next video packet.
435  * @return <0 if something went wrong
436  */
437 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
438 {
439  MpegEncContext *s = &ctx->m;
440 
441  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
442  int header_extension = 0, mb_num, len;
443 
444  /* is there enough space left for a video packet + header */
445  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
446  return -1;
447 
448  for (len = 0; len < 32; len++)
449  if (get_bits1(&s->gb))
450  break;
451 
452  if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
453  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
454  return -1;
455  }
456 
457  if (ctx->shape != RECT_SHAPE) {
458  header_extension = get_bits1(&s->gb);
459  // FIXME more stuff here
460  }
461 
462  mb_num = get_bits(&s->gb, mb_num_bits);
463  if (mb_num >= s->mb_num) {
464  av_log(s->avctx, AV_LOG_ERROR,
465  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
466  return -1;
467  }
468 
469  s->mb_x = mb_num % s->mb_width;
470  s->mb_y = mb_num / s->mb_width;
471 
472  if (ctx->shape != BIN_ONLY_SHAPE) {
473  int qscale = get_bits(&s->gb, s->quant_precision);
474  if (qscale)
475  s->chroma_qscale = s->qscale = qscale;
476  }
477 
478  if (ctx->shape == RECT_SHAPE)
479  header_extension = get_bits1(&s->gb);
480 
481  if (header_extension) {
482  int time_incr = 0;
483 
484  while (get_bits1(&s->gb) != 0)
485  time_incr++;
486 
487  check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
488  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
489  check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
490 
491  skip_bits(&s->gb, 2); /* vop coding type */
492  // FIXME not rect stuff here
493 
494  if (ctx->shape != BIN_ONLY_SHAPE) {
495  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
496  // FIXME don't just ignore everything
497  if (s->pict_type == AV_PICTURE_TYPE_S &&
498  ctx->vol_sprite_usage == GMC_SPRITE) {
499  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
500  return AVERROR_INVALIDDATA;
501  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
502  }
503 
504  // FIXME reduced res stuff here
505 
506  if (s->pict_type != AV_PICTURE_TYPE_I) {
507  int f_code = get_bits(&s->gb, 3); /* fcode_for */
508  if (f_code == 0)
509  av_log(s->avctx, AV_LOG_ERROR,
510  "Error, video packet header damaged (f_code=0)\n");
511  }
512  if (s->pict_type == AV_PICTURE_TYPE_B) {
513  int b_code = get_bits(&s->gb, 3);
514  if (b_code == 0)
515  av_log(s->avctx, AV_LOG_ERROR,
516  "Error, video packet header damaged (b_code=0)\n");
517  }
518  }
519  }
520  if (ctx->new_pred)
521  decode_new_pred(ctx, &s->gb);
522 
523  return 0;
524 }
525 
526 /**
527  * Get the average motion vector for a GMC MB.
528  * @param n either 0 for the x component or 1 for y
529  * @return the average MV for a GMC MB
530  */
531 static inline int get_amv(Mpeg4DecContext *ctx, int n)
532 {
533  MpegEncContext *s = &ctx->m;
534  int x, y, mb_v, sum, dx, dy, shift;
535  int len = 1 << (s->f_code + 4);
536  const int a = s->sprite_warping_accuracy;
537 
538  if (s->workaround_bugs & FF_BUG_AMV)
539  len >>= s->quarter_sample;
540 
541  if (s->real_sprite_warping_points == 1) {
542  if (ctx->divx_version == 500 && ctx->divx_build == 413)
543  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
544  else
545  sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
546  } else {
547  dx = s->sprite_delta[n][0];
548  dy = s->sprite_delta[n][1];
549  shift = ctx->sprite_shift[0];
550  if (n)
551  dy -= 1 << (shift + a + 1);
552  else
553  dx -= 1 << (shift + a + 1);
554  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
555 
556  sum = 0;
557  for (y = 0; y < 16; y++) {
558  int v;
559 
560  v = mb_v + dy * y;
561  // FIXME optimize
562  for (x = 0; x < 16; x++) {
563  sum += v >> shift;
564  v += dx;
565  }
566  }
567  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
568  }
569 
570  if (sum < -len)
571  sum = -len;
572  else if (sum >= len)
573  sum = len - 1;
574 
575  return sum;
576 }
577 
578 /**
579  * Decode the dc value.
580  * @param n block index (0-3 are luma, 4-5 are chroma)
581  * @param dir_ptr the prediction direction will be stored here
582  * @return the quantized dc
583  */
584 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
585 {
586  int level, code;
587 
588  if (n < 4)
589  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
590  else
591  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
592 
593  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
594  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
595  return -1;
596  }
597 
598  if (code == 0) {
599  level = 0;
600  } else {
601  if (IS_3IV1) {
602  if (code == 1)
603  level = 2 * get_bits1(&s->gb) - 1;
604  else {
605  if (get_bits1(&s->gb))
606  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
607  else
608  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
609  }
610  } else {
611  level = get_xbits(&s->gb, code);
612  }
613 
614  if (code > 8) {
615  if (get_bits1(&s->gb) == 0) { /* marker */
616  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
617  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
618  return -1;
619  }
620  }
621  }
622  }
623 
624  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
625 }
626 
627 /**
628  * Decode first partition.
629  * @return number of MBs decoded or <0 if an error occurred
630  */
631 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
632 {
633  MpegEncContext *s = &ctx->m;
634  int mb_num = 0;
635  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
636 
637  /* decode first partition */
638  s->first_slice_line = 1;
639  for (; s->mb_y < s->mb_height; s->mb_y++) {
640  ff_init_block_index(s);
641  for (; s->mb_x < s->mb_width; s->mb_x++) {
642  const int xy = s->mb_x + s->mb_y * s->mb_stride;
643  int cbpc;
644  int dir = 0;
645 
646  mb_num++;
647  ff_update_block_index(s);
648  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
649  s->first_slice_line = 0;
650 
651  if (s->pict_type == AV_PICTURE_TYPE_I) {
652  int i;
653 
654  do {
655  if (show_bits_long(&s->gb, 19) == DC_MARKER)
656  return mb_num - 1;
657 
658  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
659  if (cbpc < 0) {
660  av_log(s->avctx, AV_LOG_ERROR,
661  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
662  return -1;
663  }
664  } while (cbpc == 8);
665 
666  s->cbp_table[xy] = cbpc & 3;
667  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
668  s->mb_intra = 1;
669 
670  if (cbpc & 4)
671  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
672 
673  s->current_picture.qscale_table[xy] = s->qscale;
674 
675  s->mbintra_table[xy] = 1;
676  for (i = 0; i < 6; i++) {
677  int dc_pred_dir;
678  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
679  if (dc < 0) {
680  av_log(s->avctx, AV_LOG_ERROR,
681  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
682  return -1;
683  }
684  dir <<= 1;
685  if (dc_pred_dir)
686  dir |= 1;
687  }
688  s->pred_dir_table[xy] = dir;
689  } else { /* P/S_TYPE */
690  int mx, my, pred_x, pred_y, bits;
691  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
692  const int stride = s->b8_stride * 2;
693 
694 try_again:
695  bits = show_bits(&s->gb, 17);
696  if (bits == MOTION_MARKER)
697  return mb_num - 1;
698 
699  skip_bits1(&s->gb);
700  if (bits & 0x10000) {
701  /* skip mb */
702  if (s->pict_type == AV_PICTURE_TYPE_S &&
703  ctx->vol_sprite_usage == GMC_SPRITE) {
704  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
705  MB_TYPE_16x16 |
706  MB_TYPE_GMC |
707  MB_TYPE_L0;
708  mx = get_amv(ctx, 0);
709  my = get_amv(ctx, 1);
710  } else {
711  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
712  MB_TYPE_16x16 |
713  MB_TYPE_L0;
714  mx = my = 0;
715  }
716  mot_val[0] =
717  mot_val[2] =
718  mot_val[0 + stride] =
719  mot_val[2 + stride] = mx;
720  mot_val[1] =
721  mot_val[3] =
722  mot_val[1 + stride] =
723  mot_val[3 + stride] = my;
724 
725  if (s->mbintra_table[xy])
726  ff_clean_intra_table_entries(s);
727  continue;
728  }
729 
730  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
731  if (cbpc < 0) {
732  av_log(s->avctx, AV_LOG_ERROR,
733  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
734  return -1;
735  }
736  if (cbpc == 20)
737  goto try_again;
738 
739  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
740 
741  s->mb_intra = ((cbpc & 4) != 0);
742 
743  if (s->mb_intra) {
744  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
745  s->mbintra_table[xy] = 1;
746  mot_val[0] =
747  mot_val[2] =
748  mot_val[0 + stride] =
749  mot_val[2 + stride] = 0;
750  mot_val[1] =
751  mot_val[3] =
752  mot_val[1 + stride] =
753  mot_val[3 + stride] = 0;
754  } else {
755  if (s->mbintra_table[xy])
756  ff_clean_intra_table_entries(s);
757 
758  if (s->pict_type == AV_PICTURE_TYPE_S &&
759  ctx->vol_sprite_usage == GMC_SPRITE &&
760  (cbpc & 16) == 0)
761  s->mcsel = get_bits1(&s->gb);
762  else
763  s->mcsel = 0;
764 
765  if ((cbpc & 16) == 0) {
766  /* 16x16 motion prediction */
767 
768  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
769  if (!s->mcsel) {
770  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
771  if (mx >= 0xffff)
772  return -1;
773 
774  my = ff_h263_decode_motion(s, pred_y, s->f_code);
775  if (my >= 0xffff)
776  return -1;
777  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
778  MB_TYPE_L0;
779  } else {
780  mx = get_amv(ctx, 0);
781  my = get_amv(ctx, 1);
782  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
783  MB_TYPE_GMC |
784  MB_TYPE_L0;
785  }
786 
787  mot_val[0] =
788  mot_val[2] =
789  mot_val[0 + stride] =
790  mot_val[2 + stride] = mx;
791  mot_val[1] =
792  mot_val[3] =
793  mot_val[1 + stride] =
794  mot_val[3 + stride] = my;
795  } else {
796  int i;
797  s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
798  MB_TYPE_L0;
799  for (i = 0; i < 4; i++) {
800  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
801  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
802  if (mx >= 0xffff)
803  return -1;
804 
805  my = ff_h263_decode_motion(s, pred_y, s->f_code);
806  if (my >= 0xffff)
807  return -1;
808  mot_val[0] = mx;
809  mot_val[1] = my;
810  }
811  }
812  }
813  }
814  }
815  s->mb_x = 0;
816  }
817 
818  return mb_num;
819 }
820 
821 /**
822  * decode second partition.
823  * @return <0 if an error occurred
824  */
825 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
826 {
827  int mb_num = 0;
828  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
829 
830  s->mb_x = s->resync_mb_x;
831  s->first_slice_line = 1;
832  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
833  ff_init_block_index(s);
834  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
835  const int xy = s->mb_x + s->mb_y * s->mb_stride;
836 
837  mb_num++;
838  ff_update_block_index(s);
839  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
840  s->first_slice_line = 0;
841 
842  if (s->pict_type == AV_PICTURE_TYPE_I) {
843  int ac_pred = get_bits1(&s->gb);
844  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
845  if (cbpy < 0) {
846  av_log(s->avctx, AV_LOG_ERROR,
847  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
848  return -1;
849  }
850 
851  s->cbp_table[xy] |= cbpy << 2;
852  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
853  } else { /* P || S_TYPE */
854  if (IS_INTRA(s->current_picture.mb_type[xy])) {
855  int i;
856  int dir = 0;
857  int ac_pred = get_bits1(&s->gb);
858  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
859 
860  if (cbpy < 0) {
861  av_log(s->avctx, AV_LOG_ERROR,
862  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
863  return -1;
864  }
865 
866  if (s->cbp_table[xy] & 8)
867  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
868  s->current_picture.qscale_table[xy] = s->qscale;
869 
870  for (i = 0; i < 6; i++) {
871  int dc_pred_dir;
872  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
873  if (dc < 0) {
874  av_log(s->avctx, AV_LOG_ERROR,
875  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
876  return -1;
877  }
878  dir <<= 1;
879  if (dc_pred_dir)
880  dir |= 1;
881  }
882  s->cbp_table[xy] &= 3; // remove dquant
883  s->cbp_table[xy] |= cbpy << 2;
884  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
885  s->pred_dir_table[xy] = dir;
886  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
887  s->current_picture.qscale_table[xy] = s->qscale;
888  s->cbp_table[xy] = 0;
889  } else {
890  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
891 
892  if (cbpy < 0) {
893  av_log(s->avctx, AV_LOG_ERROR,
894  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
895  return -1;
896  }
897 
898  if (s->cbp_table[xy] & 8)
899  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
900  s->current_picture.qscale_table[xy] = s->qscale;
901 
902  s->cbp_table[xy] &= 3; // remove dquant
903  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
904  }
905  }
906  }
907  if (mb_num >= mb_count)
908  return 0;
909  s->mb_x = 0;
910  }
911  return 0;
912 }
913 
914 /**
915  * Decode the first and second partition.
916  * @return <0 if error (and sets error type in the error_status_table)
917  */
918 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
919 {
920  MpegEncContext *s = &ctx->m;
921  int mb_num;
922  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
923  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
924 
925  mb_num = mpeg4_decode_partition_a(ctx);
926  if (mb_num <= 0) {
927  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
928  s->mb_x, s->mb_y, part_a_error);
929  return -1;
930  }
931 
932  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
933  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
934  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
935  s->mb_x, s->mb_y, part_a_error);
936  return -1;
937  }
938 
939  s->mb_num_left = mb_num;
940 
941  if (s->pict_type == AV_PICTURE_TYPE_I) {
942  while (show_bits(&s->gb, 9) == 1)
943  skip_bits(&s->gb, 9);
944  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
945  av_log(s->avctx, AV_LOG_ERROR,
946  "marker missing after first I partition at %d %d\n",
947  s->mb_x, s->mb_y);
948  return -1;
949  }
950  } else {
951  while (show_bits(&s->gb, 10) == 1)
952  skip_bits(&s->gb, 10);
953  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
954  av_log(s->avctx, AV_LOG_ERROR,
955  "marker missing after first P partition at %d %d\n",
956  s->mb_x, s->mb_y);
957  return -1;
958  }
959  }
960  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
961  s->mb_x - 1, s->mb_y, part_a_end);
962 
963  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
964  if (s->pict_type == AV_PICTURE_TYPE_P)
965  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
966  s->mb_x, s->mb_y, ER_DC_ERROR);
967  return -1;
968  } else {
969  if (s->pict_type == AV_PICTURE_TYPE_P)
970  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
971  s->mb_x - 1, s->mb_y, ER_DC_END);
972  }
973 
974  return 0;
975 }
976 
977 /**
978  * Decode a block.
979  * @return <0 if an error occurred
980  */
981 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
982  int n, int coded, int intra, int rvlc)
983 {
984  MpegEncContext *s = &ctx->m;
985  int level, i, last, run, qmul, qadd;
986  int av_uninit(dc_pred_dir);
987  RLTable *rl;
988  RL_VLC_ELEM *rl_vlc;
989  const uint8_t *scan_table;
990 
991  // Note intra & rvlc should be optimized away if this is inlined
992 
993  if (intra) {
994  if (ctx->use_intra_dc_vlc) {
995  /* DC coef */
996  if (s->partitioned_frame) {
997  level = s->dc_val[0][s->block_index[n]];
998  if (n < 4)
999  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1000  else
1001  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1002  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1003  } else {
1004  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1005  if (level < 0)
1006  return -1;
1007  }
1008  block[0] = level;
1009  i = 0;
1010  } else {
1011  i = -1;
1012  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1013  }
1014  if (!coded)
1015  goto not_coded;
1016 
1017  if (rvlc) {
1018  rl = &ff_rvlc_rl_intra;
1019  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1020  } else {
1021  rl = &ff_mpeg4_rl_intra;
1022  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1023  }
1024  if (s->ac_pred) {
1025  if (dc_pred_dir == 0)
1026  scan_table = s->intra_v_scantable.permutated; /* left */
1027  else
1028  scan_table = s->intra_h_scantable.permutated; /* top */
1029  } else {
1030  scan_table = s->intra_scantable.permutated;
1031  }
1032  qmul = 1;
1033  qadd = 0;
1034  } else {
1035  i = -1;
1036  if (!coded) {
1037  s->block_last_index[n] = i;
1038  return 0;
1039  }
1040  if (rvlc)
1041  rl = &ff_rvlc_rl_inter;
1042  else
1043  rl = &ff_h263_rl_inter;
1044 
1045  scan_table = s->intra_scantable.permutated;
1046 
1047  if (s->mpeg_quant) {
1048  qmul = 1;
1049  qadd = 0;
1050  if (rvlc)
1051  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1052  else
1053  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1054  } else {
1055  qmul = s->qscale << 1;
1056  qadd = (s->qscale - 1) | 1;
1057  if (rvlc)
1058  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1059  else
1060  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1061  }
1062  }
1063  {
1064  OPEN_READER(re, &s->gb);
1065  for (;;) {
1066  UPDATE_CACHE(re, &s->gb);
1067  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1068  if (level == 0) {
1069  /* escape */
1070  if (rvlc) {
1071  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1072  av_log(s->avctx, AV_LOG_ERROR,
1073  "1. marker bit missing in rvlc esc\n");
1074  return -1;
1075  }
1076  SKIP_CACHE(re, &s->gb, 1);
1077 
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, 1 + 1 + 6);
1082  UPDATE_CACHE(re, &s->gb);
1083 
1084  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1085  av_log(s->avctx, AV_LOG_ERROR,
1086  "2. marker bit missing in rvlc esc\n");
1087  return -1;
1088  }
1089  SKIP_CACHE(re, &s->gb, 1);
1090 
1091  level = SHOW_UBITS(re, &s->gb, 11);
1092  SKIP_CACHE(re, &s->gb, 11);
1093 
1094  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1095  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1096  return -1;
1097  }
1098  SKIP_CACHE(re, &s->gb, 5);
1099 
1100  level = level * qmul + qadd;
1101  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1102  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1103 
1104  i += run + 1;
1105  if (last)
1106  i += 192;
1107  } else {
1108  int cache;
1109  cache = GET_CACHE(re, &s->gb);
1110 
1111  if (IS_3IV1)
1112  cache ^= 0xC0000000;
1113 
1114  if (cache & 0x80000000) {
1115  if (cache & 0x40000000) {
1116  /* third escape */
1117  SKIP_CACHE(re, &s->gb, 2);
1118  last = SHOW_UBITS(re, &s->gb, 1);
1119  SKIP_CACHE(re, &s->gb, 1);
1120  run = SHOW_UBITS(re, &s->gb, 6);
1121  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1122  UPDATE_CACHE(re, &s->gb);
1123 
1124  if (IS_3IV1) {
1125  level = SHOW_SBITS(re, &s->gb, 12);
1126  LAST_SKIP_BITS(re, &s->gb, 12);
1127  } else {
1128  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1129  av_log(s->avctx, AV_LOG_ERROR,
1130  "1. marker bit missing in 3. esc\n");
1131  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1132  return -1;
1133  }
1134  SKIP_CACHE(re, &s->gb, 1);
1135 
1136  level = SHOW_SBITS(re, &s->gb, 12);
1137  SKIP_CACHE(re, &s->gb, 12);
1138 
1139  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1140  av_log(s->avctx, AV_LOG_ERROR,
1141  "2. marker bit missing in 3. esc\n");
1142  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1143  return -1;
1144  }
1145 
1146  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1147  }
1148 
1149 #if 0
1150  if (s->error_recognition >= FF_ER_COMPLIANT) {
1151  const int abs_level= FFABS(level);
1152  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1153  const int run1= run - rl->max_run[last][abs_level] - 1;
1154  if (abs_level <= rl->max_level[last][run]) {
1155  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1156  return -1;
1157  }
1158  if (s->error_recognition > FF_ER_COMPLIANT) {
1159  if (abs_level <= rl->max_level[last][run]*2) {
1160  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1161  return -1;
1162  }
1163  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1164  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1165  return -1;
1166  }
1167  }
1168  }
1169  }
1170 #endif
1171  if (level > 0)
1172  level = level * qmul + qadd;
1173  else
1174  level = level * qmul - qadd;
1175 
1176  if ((unsigned)(level + 2048) > 4095) {
1177  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1178  if (level > 2560 || level < -2560) {
1179  av_log(s->avctx, AV_LOG_ERROR,
1180  "|level| overflow in 3. esc, qp=%d\n",
1181  s->qscale);
1182  return -1;
1183  }
1184  }
1185  level = level < 0 ? -2048 : 2047;
1186  }
1187 
1188  i += run + 1;
1189  if (last)
1190  i += 192;
1191  } else {
1192  /* second escape */
1193  SKIP_BITS(re, &s->gb, 2);
1194  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1195  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1196  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1197  LAST_SKIP_BITS(re, &s->gb, 1);
1198  }
1199  } else {
1200  /* first escape */
1201  SKIP_BITS(re, &s->gb, 1);
1202  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1203  i += run;
1204  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1205  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1206  LAST_SKIP_BITS(re, &s->gb, 1);
1207  }
1208  }
1209  } else {
1210  i += run;
1211  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1212  LAST_SKIP_BITS(re, &s->gb, 1);
1213  }
1214  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1215  if (i > 62) {
1216  i -= 192;
1217  if (i & (~63)) {
1218  av_log(s->avctx, AV_LOG_ERROR,
1219  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1220  return -1;
1221  }
1222 
1223  block[scan_table[i]] = level;
1224  break;
1225  }
1226 
1227  block[scan_table[i]] = level;
1228  }
1229  CLOSE_READER(re, &s->gb);
1230  }
1231 
1232 not_coded:
1233  if (intra) {
1234  if (!ctx->use_intra_dc_vlc) {
1235  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1236 
1237  i -= i >> 31; // if (i == -1) i = 0;
1238  }
1239 
1240  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1241  if (s->ac_pred)
1242  i = 63; // FIXME not optimal
1243  }
1244  s->block_last_index[n] = i;
1245  return 0;
1246 }
1247 
1248 /**
1249  * decode partition C of one MB.
1250  * @return <0 if an error occurred
1251  */
1252 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1253 {
1254  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1255  int cbp, mb_type;
1256  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1257 
1258  mb_type = s->current_picture.mb_type[xy];
1259  cbp = s->cbp_table[xy];
1260 
1261  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1262 
1263  if (s->current_picture.qscale_table[xy] != s->qscale)
1264  ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1265 
1266  if (s->pict_type == AV_PICTURE_TYPE_P ||
1267  s->pict_type == AV_PICTURE_TYPE_S) {
1268  int i;
1269  for (i = 0; i < 4; i++) {
1270  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1271  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1272  }
1273  s->mb_intra = IS_INTRA(mb_type);
1274 
1275  if (IS_SKIP(mb_type)) {
1276  /* skip mb */
1277  for (i = 0; i < 6; i++)
1278  s->block_last_index[i] = -1;
1279  s->mv_dir = MV_DIR_FORWARD;
1280  s->mv_type = MV_TYPE_16X16;
1281  if (s->pict_type == AV_PICTURE_TYPE_S
1282  && ctx->vol_sprite_usage == GMC_SPRITE) {
1283  s->mcsel = 1;
1284  s->mb_skipped = 0;
1285  } else {
1286  s->mcsel = 0;
1287  s->mb_skipped = 1;
1288  }
1289  } else if (s->mb_intra) {
1290  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1291  } else if (!s->mb_intra) {
1292  // s->mcsel = 0; // FIXME do we need to init that?
1293 
1294  s->mv_dir = MV_DIR_FORWARD;
1295  if (IS_8X8(mb_type)) {
1296  s->mv_type = MV_TYPE_8X8;
1297  } else {
1298  s->mv_type = MV_TYPE_16X16;
1299  }
1300  }
1301  } else { /* I-Frame */
1302  s->mb_intra = 1;
1303  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1304  }
1305 
1306  if (!IS_SKIP(mb_type)) {
1307  int i;
1308  s->bdsp.clear_blocks(s->block[0]);
1309  /* decode each block */
1310  for (i = 0; i < 6; i++) {
1311  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1312  av_log(s->avctx, AV_LOG_ERROR,
1313  "texture corrupted at %d %d %d\n",
1314  s->mb_x, s->mb_y, s->mb_intra);
1315  return -1;
1316  }
1317  cbp += cbp;
1318  }
1319  }
1320 
1321  /* per-MB end of slice check */
1322  if (--s->mb_num_left <= 0) {
1323  if (mpeg4_is_resync(ctx))
1324  return SLICE_END;
1325  else
1326  return SLICE_NOEND;
1327  } else {
1328  if (mpeg4_is_resync(ctx)) {
1329  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1330  if (s->cbp_table[xy + delta])
1331  return SLICE_END;
1332  }
1333  return SLICE_OK;
1334  }
1335 }
1336 
1337 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1338 {
1339  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1340  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1341  int16_t *mot_val;
1342  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1343  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1344 
1345  av_assert2(s->h263_pred);
1346 
1347  if (s->pict_type == AV_PICTURE_TYPE_P ||
1348  s->pict_type == AV_PICTURE_TYPE_S) {
1349  do {
1350  if (get_bits1(&s->gb)) {
1351  /* skip mb */
1352  s->mb_intra = 0;
1353  for (i = 0; i < 6; i++)
1354  s->block_last_index[i] = -1;
1355  s->mv_dir = MV_DIR_FORWARD;
1356  s->mv_type = MV_TYPE_16X16;
1357  if (s->pict_type == AV_PICTURE_TYPE_S &&
1358  ctx->vol_sprite_usage == GMC_SPRITE) {
1359  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1360  MB_TYPE_GMC |
1361  MB_TYPE_16x16 |
1362  MB_TYPE_L0;
1363  s->mcsel = 1;
1364  s->mv[0][0][0] = get_amv(ctx, 0);
1365  s->mv[0][0][1] = get_amv(ctx, 1);
1366  s->mb_skipped = 0;
1367  } else {
1368  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1369  MB_TYPE_16x16 |
1370  MB_TYPE_L0;
1371  s->mcsel = 0;
1372  s->mv[0][0][0] = 0;
1373  s->mv[0][0][1] = 0;
1374  s->mb_skipped = 1;
1375  }
1376  goto end;
1377  }
1378  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1379  if (cbpc < 0) {
1380  av_log(s->avctx, AV_LOG_ERROR,
1381  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1382  return -1;
1383  }
1384  } while (cbpc == 20);
1385 
1386  s->bdsp.clear_blocks(s->block[0]);
1387  dquant = cbpc & 8;
1388  s->mb_intra = ((cbpc & 4) != 0);
1389  if (s->mb_intra)
1390  goto intra;
1391 
1392  if (s->pict_type == AV_PICTURE_TYPE_S &&
1393  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1394  s->mcsel = get_bits1(&s->gb);
1395  else
1396  s->mcsel = 0;
1397  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1398  if (cbpy < 0) {
1399  av_log(s->avctx, AV_LOG_ERROR,
1400  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1401  return AVERROR_INVALIDDATA;
1402  }
1403 
1404  cbp = (cbpc & 3) | (cbpy << 2);
1405  if (dquant)
1406  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1407  if ((!s->progressive_sequence) &&
1408  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1409  s->interlaced_dct = get_bits1(&s->gb);
1410 
1411  s->mv_dir = MV_DIR_FORWARD;
1412  if ((cbpc & 16) == 0) {
1413  if (s->mcsel) {
1414  s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1415  MB_TYPE_16x16 |
1416  MB_TYPE_L0;
1417  /* 16x16 global motion prediction */
1418  s->mv_type = MV_TYPE_16X16;
1419  mx = get_amv(ctx, 0);
1420  my = get_amv(ctx, 1);
1421  s->mv[0][0][0] = mx;
1422  s->mv[0][0][1] = my;
1423  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1424  s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1425  MB_TYPE_L0 |
1426  MB_TYPE_INTERLACED;
1427  /* 16x8 field motion prediction */
1428  s->mv_type = MV_TYPE_FIELD;
1429 
1430  s->field_select[0][0] = get_bits1(&s->gb);
1431  s->field_select[0][1] = get_bits1(&s->gb);
1432 
1433  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1434 
1435  for (i = 0; i < 2; i++) {
1436  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1437  if (mx >= 0xffff)
1438  return -1;
1439 
1440  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1441  if (my >= 0xffff)
1442  return -1;
1443 
1444  s->mv[0][i][0] = mx;
1445  s->mv[0][i][1] = my;
1446  }
1447  } else {
1448  s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1449  /* 16x16 motion prediction */
1450  s->mv_type = MV_TYPE_16X16;
1451  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1452  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1453 
1454  if (mx >= 0xffff)
1455  return -1;
1456 
1457  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1458 
1459  if (my >= 0xffff)
1460  return -1;
1461  s->mv[0][0][0] = mx;
1462  s->mv[0][0][1] = my;
1463  }
1464  } else {
1465  s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1466  s->mv_type = MV_TYPE_8X8;
1467  for (i = 0; i < 4; i++) {
1468  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1469  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1470  if (mx >= 0xffff)
1471  return -1;
1472 
1473  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1474  if (my >= 0xffff)
1475  return -1;
1476  s->mv[0][i][0] = mx;
1477  s->mv[0][i][1] = my;
1478  mot_val[0] = mx;
1479  mot_val[1] = my;
1480  }
1481  }
1482  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1483  int modb1; // first bit of modb
1484  int modb2; // second bit of modb
1485  int mb_type;
1486 
1487  s->mb_intra = 0; // B-frames never contain intra blocks
1488  s->mcsel = 0; // ... true gmc blocks
1489 
1490  if (s->mb_x == 0) {
1491  for (i = 0; i < 2; i++) {
1492  s->last_mv[i][0][0] =
1493  s->last_mv[i][0][1] =
1494  s->last_mv[i][1][0] =
1495  s->last_mv[i][1][1] = 0;
1496  }
1497 
1498  ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1499  }
1500 
1501  /* if we skipped it in the future P-frame than skip it now too */
1502  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1503 
1504  if (s->mb_skipped) {
1505  /* skip mb */
1506  for (i = 0; i < 6; i++)
1507  s->block_last_index[i] = -1;
1508 
1509  s->mv_dir = MV_DIR_FORWARD;
1510  s->mv_type = MV_TYPE_16X16;
1511  s->mv[0][0][0] =
1512  s->mv[0][0][1] =
1513  s->mv[1][0][0] =
1514  s->mv[1][0][1] = 0;
1515  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1516  MB_TYPE_16x16 |
1517  MB_TYPE_L0;
1518  goto end;
1519  }
1520 
1521  modb1 = get_bits1(&s->gb);
1522  if (modb1) {
1523  // like MB_TYPE_B_DIRECT but no vectors coded
1524  mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1525  cbp = 0;
1526  } else {
1527  modb2 = get_bits1(&s->gb);
1528  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1529  if (mb_type < 0) {
1530  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1531  return -1;
1532  }
1533  mb_type = mb_type_b_map[mb_type];
1534  if (modb2) {
1535  cbp = 0;
1536  } else {
1537  s->bdsp.clear_blocks(s->block[0]);
1538  cbp = get_bits(&s->gb, 6);
1539  }
1540 
1541  if ((!IS_DIRECT(mb_type)) && cbp) {
1542  if (get_bits1(&s->gb))
1543  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1544  }
1545 
1546  if (!s->progressive_sequence) {
1547  if (cbp)
1548  s->interlaced_dct = get_bits1(&s->gb);
1549 
1550  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1551  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1552  mb_type &= ~MB_TYPE_16x16;
1553 
1554  if (USES_LIST(mb_type, 0)) {
1555  s->field_select[0][0] = get_bits1(&s->gb);
1556  s->field_select[0][1] = get_bits1(&s->gb);
1557  }
1558  if (USES_LIST(mb_type, 1)) {
1559  s->field_select[1][0] = get_bits1(&s->gb);
1560  s->field_select[1][1] = get_bits1(&s->gb);
1561  }
1562  }
1563  }
1564 
1565  s->mv_dir = 0;
1566  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1567  s->mv_type = MV_TYPE_16X16;
1568 
1569  if (USES_LIST(mb_type, 0)) {
1570  s->mv_dir = MV_DIR_FORWARD;
1571 
1572  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1573  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1574  s->last_mv[0][1][0] =
1575  s->last_mv[0][0][0] =
1576  s->mv[0][0][0] = mx;
1577  s->last_mv[0][1][1] =
1578  s->last_mv[0][0][1] =
1579  s->mv[0][0][1] = my;
1580  }
1581 
1582  if (USES_LIST(mb_type, 1)) {
1583  s->mv_dir |= MV_DIR_BACKWARD;
1584 
1585  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1586  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1587  s->last_mv[1][1][0] =
1588  s->last_mv[1][0][0] =
1589  s->mv[1][0][0] = mx;
1590  s->last_mv[1][1][1] =
1591  s->last_mv[1][0][1] =
1592  s->mv[1][0][1] = my;
1593  }
1594  } else if (!IS_DIRECT(mb_type)) {
1595  s->mv_type = MV_TYPE_FIELD;
1596 
1597  if (USES_LIST(mb_type, 0)) {
1598  s->mv_dir = MV_DIR_FORWARD;
1599 
1600  for (i = 0; i < 2; i++) {
1601  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1602  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1603  s->last_mv[0][i][0] =
1604  s->mv[0][i][0] = mx;
1605  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1606  }
1607  }
1608 
1609  if (USES_LIST(mb_type, 1)) {
1610  s->mv_dir |= MV_DIR_BACKWARD;
1611 
1612  for (i = 0; i < 2; i++) {
1613  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1614  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1615  s->last_mv[1][i][0] =
1616  s->mv[1][i][0] = mx;
1617  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1618  }
1619  }
1620  }
1621  }
1622 
1623  if (IS_DIRECT(mb_type)) {
1624  if (IS_SKIP(mb_type)) {
1625  mx =
1626  my = 0;
1627  } else {
1628  mx = ff_h263_decode_motion(s, 0, 1);
1629  my = ff_h263_decode_motion(s, 0, 1);
1630  }
1631 
1632  s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1633  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1634  }
1635  s->current_picture.mb_type[xy] = mb_type;
1636  } else { /* I-Frame */
1637  do {
1638  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1639  if (cbpc < 0) {
1640  av_log(s->avctx, AV_LOG_ERROR,
1641  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1642  return -1;
1643  }
1644  } while (cbpc == 8);
1645 
1646  dquant = cbpc & 4;
1647  s->mb_intra = 1;
1648 
1649 intra:
1650  s->ac_pred = get_bits1(&s->gb);
1651  if (s->ac_pred)
1652  s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1653  else
1654  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1655 
1656  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1657  if (cbpy < 0) {
1658  av_log(s->avctx, AV_LOG_ERROR,
1659  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1660  return -1;
1661  }
1662  cbp = (cbpc & 3) | (cbpy << 2);
1663 
1664  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1665 
1666  if (dquant)
1667  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1668 
1669  if (!s->progressive_sequence)
1670  s->interlaced_dct = get_bits1(&s->gb);
1671 
1672  s->bdsp.clear_blocks(s->block[0]);
1673  /* decode each block */
1674  for (i = 0; i < 6; i++) {
1675  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1676  return -1;
1677  cbp += cbp;
1678  }
1679  goto end;
1680  }
1681 
1682  /* decode each block */
1683  for (i = 0; i < 6; i++) {
1684  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1685  return -1;
1686  cbp += cbp;
1687  }
1688 
1689 end:
1690  /* per-MB end of slice check */
1691  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1692  int next = mpeg4_is_resync(ctx);
1693  if (next) {
1694  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1695  return -1;
1696  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1697  return SLICE_END;
1698 
1699  if (s->pict_type == AV_PICTURE_TYPE_B) {
1700  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1701  ff_thread_await_progress(&s->next_picture_ptr->tf,
1702  (s->mb_x + delta >= s->mb_width)
1703  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1704  : s->mb_y, 0);
1705  if (s->next_picture.mbskip_table[xy + delta])
1706  return SLICE_OK;
1707  }
1708 
1709  return SLICE_END;
1710  }
1711  }
1712 
1713  return SLICE_OK;
1714 }
1715 
1716 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1717 {
1718  int hours, minutes, seconds;
1719 
1720  if (!show_bits(gb, 23)) {
1721  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1722  return -1;
1723  }
1724 
1725  hours = get_bits(gb, 5);
1726  minutes = get_bits(gb, 6);
1727  check_marker(s->avctx, gb, "in gop_header");
1728  seconds = get_bits(gb, 6);
1729 
1730  s->time_base = seconds + 60*(minutes + 60*hours);
1731 
1732  skip_bits1(gb);
1733  skip_bits1(gb);
1734 
1735  return 0;
1736 }
1737 
1738 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1739 {
1740 
1741  s->avctx->profile = get_bits(gb, 4);
1742  s->avctx->level = get_bits(gb, 4);
1743 
1744  // for Simple profile, level 0
1745  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1746  s->avctx->level = 0;
1747  }
1748 
1749  return 0;
1750 }
1751 
1752 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1753 {
1754  MpegEncContext *s = &ctx->m;
1755  int width, height, vo_ver_id;
1756 
1757  /* vol header */
1758  skip_bits(gb, 1); /* random access */
1759  s->vo_type = get_bits(gb, 8);
1760  if (get_bits1(gb) != 0) { /* is_ol_id */
1761  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1762  skip_bits(gb, 3); /* vo_priority */
1763  } else {
1764  vo_ver_id = 1;
1765  }
1766  s->aspect_ratio_info = get_bits(gb, 4);
1767  if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1768  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1769  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1770  } else {
1771  s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1772  }
1773 
1774  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1775  int chroma_format = get_bits(gb, 2);
1776  if (chroma_format != CHROMA_420)
1777  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1778 
1779  s->low_delay = get_bits1(gb);
1780  if (get_bits1(gb)) { /* vbv parameters */
1781  get_bits(gb, 15); /* first_half_bitrate */
1782  check_marker(s->avctx, gb, "after first_half_bitrate");
1783  get_bits(gb, 15); /* latter_half_bitrate */
1784  check_marker(s->avctx, gb, "after latter_half_bitrate");
1785  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1786  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1787  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1788  get_bits(gb, 11); /* first_half_vbv_occupancy */
1789  check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1790  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1791  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1792  }
1793  } else {
1794  /* is setting low delay flag only once the smartest thing to do?
1795  * low delay detection will not be overridden. */
1796  if (s->picture_number == 0) {
1797  switch(s->vo_type) {
1798  case SIMPLE_VO_TYPE:
1799  case ADV_SIMPLE_VO_TYPE:
1800  s->low_delay = 1;
1801  break;
1802  default:
1803  s->low_delay = 0;
1804  }
1805  }
1806  }
1807 
1808  ctx->shape = get_bits(gb, 2); /* vol shape */
1809  if (ctx->shape != RECT_SHAPE)
1810  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1811  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1812  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1813  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1814  }
1815 
1816  check_marker(s->avctx, gb, "before time_increment_resolution");
1817 
1818  s->avctx->framerate.num = get_bits(gb, 16);
1819  if (!s->avctx->framerate.num) {
1820  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1821  return AVERROR_INVALIDDATA;
1822  }
1823 
1824  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1825  if (ctx->time_increment_bits < 1)
1826  ctx->time_increment_bits = 1;
1827 
1828  check_marker(s->avctx, gb, "before fixed_vop_rate");
1829 
1830  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1831  s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
1832  else
1833  s->avctx->framerate.den = 1;
1834 
1835  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1836 
1837  ctx->t_frame = 0;
1838 
1839  if (ctx->shape != BIN_ONLY_SHAPE) {
1840  if (ctx->shape == RECT_SHAPE) {
1841  check_marker(s->avctx, gb, "before width");
1842  width = get_bits(gb, 13);
1843  check_marker(s->avctx, gb, "before height");
1844  height = get_bits(gb, 13);
1845  check_marker(s->avctx, gb, "after height");
1846  if (width && height && /* they should be non zero but who knows */
1847  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1848  if (s->width && s->height &&
1849  (s->width != width || s->height != height))
1850  s->context_reinit = 1;
1851  s->width = width;
1852  s->height = height;
1853  }
1854  }
1855 
1856  s->progressive_sequence =
1857  s->progressive_frame = get_bits1(gb) ^ 1;
1858  s->interlaced_dct = 0;
1859  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1860  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1861  "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1862  if (vo_ver_id == 1)
1863  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1864  else
1865  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1866 
1867  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1868  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1869  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1870  ctx->vol_sprite_usage == GMC_SPRITE) {
1871  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1872  skip_bits(gb, 13); // sprite_width
1873  check_marker(s->avctx, gb, "after sprite_width");
1874  skip_bits(gb, 13); // sprite_height
1875  check_marker(s->avctx, gb, "after sprite_height");
1876  skip_bits(gb, 13); // sprite_left
1877  check_marker(s->avctx, gb, "after sprite_left");
1878  skip_bits(gb, 13); // sprite_top
1879  check_marker(s->avctx, gb, "after sprite_top");
1880  }
1881  ctx->num_sprite_warping_points = get_bits(gb, 6);
1882  if (ctx->num_sprite_warping_points > 3) {
1883  av_log(s->avctx, AV_LOG_ERROR,
1884  "%d sprite_warping_points\n",
1885  ctx->num_sprite_warping_points);
1886  ctx->num_sprite_warping_points = 0;
1887  return AVERROR_INVALIDDATA;
1888  }
1889  s->sprite_warping_accuracy = get_bits(gb, 2);
1890  ctx->sprite_brightness_change = get_bits1(gb);
1891  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1892  skip_bits1(gb); // low_latency_sprite
1893  }
1894  // FIXME sadct disable bit if verid!=1 && shape not rect
1895 
1896  if (get_bits1(gb) == 1) { /* not_8_bit */
1897  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1898  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1899  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1900  if (s->quant_precision != 5)
1901  av_log(s->avctx, AV_LOG_ERROR,
1902  "quant precision %d\n", s->quant_precision);
1903  if (s->quant_precision<3 || s->quant_precision>9) {
1904  s->quant_precision = 5;
1905  }
1906  } else {
1907  s->quant_precision = 5;
1908  }
1909 
1910  // FIXME a bunch of grayscale shape things
1911 
1912  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1913  int i, v;
1914 
1915  /* load default matrixes */
1916  for (i = 0; i < 64; i++) {
1917  int j = s->idsp.idct_permutation[i];
1918  v = ff_mpeg4_default_intra_matrix[i];
1919  s->intra_matrix[j] = v;
1920  s->chroma_intra_matrix[j] = v;
1921 
1922  v = ff_mpeg4_default_non_intra_matrix[i];
1923  s->inter_matrix[j] = v;
1924  s->chroma_inter_matrix[j] = v;
1925  }
1926 
1927  /* load custom intra matrix */
1928  if (get_bits1(gb)) {
1929  int last = 0;
1930  for (i = 0; i < 64; i++) {
1931  int j;
1932  if (get_bits_left(gb) < 8) {
1933  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1934  return AVERROR_INVALIDDATA;
1935  }
1936  v = get_bits(gb, 8);
1937  if (v == 0)
1938  break;
1939 
1940  last = v;
1941  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1942  s->intra_matrix[j] = last;
1943  s->chroma_intra_matrix[j] = last;
1944  }
1945 
1946  /* replicate last value */
1947  for (; i < 64; i++) {
1948  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1949  s->intra_matrix[j] = last;
1950  s->chroma_intra_matrix[j] = last;
1951  }
1952  }
1953 
1954  /* load custom non intra matrix */
1955  if (get_bits1(gb)) {
1956  int last = 0;
1957  for (i = 0; i < 64; i++) {
1958  int j;
1959  if (get_bits_left(gb) < 8) {
1960  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1961  return AVERROR_INVALIDDATA;
1962  }
1963  v = get_bits(gb, 8);
1964  if (v == 0)
1965  break;
1966 
1967  last = v;
1968  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1969  s->inter_matrix[j] = v;
1970  s->chroma_inter_matrix[j] = v;
1971  }
1972 
1973  /* replicate last value */
1974  for (; i < 64; i++) {
1975  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1976  s->inter_matrix[j] = last;
1977  s->chroma_inter_matrix[j] = last;
1978  }
1979  }
1980 
1981  // FIXME a bunch of grayscale shape things
1982  }
1983 
1984  if (vo_ver_id != 1)
1985  s->quarter_sample = get_bits1(gb);
1986  else
1987  s->quarter_sample = 0;
1988 
1989  if (get_bits_left(gb) < 4) {
1990  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1991  return AVERROR_INVALIDDATA;
1992  }
1993 
1994  if (!get_bits1(gb)) {
1995  int pos = get_bits_count(gb);
1996  int estimation_method = get_bits(gb, 2);
1997  if (estimation_method < 2) {
1998  if (!get_bits1(gb)) {
1999  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2000  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2001  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2002  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2003  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2004  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2005  }
2006  if (!get_bits1(gb)) {
2007  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2008  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2009  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2010  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2011  }
2012  if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2013  skip_bits_long(gb, pos - get_bits_count(gb));
2014  goto no_cplx_est;
2015  }
2016  if (!get_bits1(gb)) {
2017  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2018  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2019  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2020  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2021  }
2022  if (!get_bits1(gb)) {
2023  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2024  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2025  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2026  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2027  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2028  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2029  }
2030  if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2031  skip_bits_long(gb, pos - get_bits_count(gb));
2032  goto no_cplx_est;
2033  }
2034  if (estimation_method == 1) {
2035  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2036  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2037  }
2038  } else
2039  av_log(s->avctx, AV_LOG_ERROR,
2040  "Invalid Complexity estimation method %d\n",
2041  estimation_method);
2042  } else {
2043 
2044 no_cplx_est:
2045  ctx->cplx_estimation_trash_i =
2046  ctx->cplx_estimation_trash_p =
2047  ctx->cplx_estimation_trash_b = 0;
2048  }
2049 
2050  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2051 
2052  s->data_partitioning = get_bits1(gb);
2053  if (s->data_partitioning)
2054  ctx->rvlc = get_bits1(gb);
2055 
2056  if (vo_ver_id != 1) {
2057  ctx->new_pred = get_bits1(gb);
2058  if (ctx->new_pred) {
2059  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2060  skip_bits(gb, 2); /* requested upstream message type */
2061  skip_bits1(gb); /* newpred segment type */
2062  }
2063  if (get_bits1(gb)) // reduced_res_vop
2064  av_log(s->avctx, AV_LOG_ERROR,
2065  "reduced resolution VOP not supported\n");
2066  } else {
2067  ctx->new_pred = 0;
2068  }
2069 
2070  ctx->scalability = get_bits1(gb);
2071 
2072  if (ctx->scalability) {
2073  GetBitContext bak = *gb;
2074  int h_sampling_factor_n;
2075  int h_sampling_factor_m;
2076  int v_sampling_factor_n;
2077  int v_sampling_factor_m;
2078 
2079  skip_bits1(gb); // hierarchy_type
2080  skip_bits(gb, 4); /* ref_layer_id */
2081  skip_bits1(gb); /* ref_layer_sampling_dir */
2082  h_sampling_factor_n = get_bits(gb, 5);
2083  h_sampling_factor_m = get_bits(gb, 5);
2084  v_sampling_factor_n = get_bits(gb, 5);
2085  v_sampling_factor_m = get_bits(gb, 5);
2086  ctx->enhancement_type = get_bits1(gb);
2087 
2088  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2089  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2090  /* illegal scalability header (VERY broken encoder),
2091  * trying to workaround */
2092  ctx->scalability = 0;
2093  *gb = bak;
2094  } else
2095  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2096 
2097  // bin shape stuff FIXME
2098  }
2099  }
2100 
2101  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2102  av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d %s%s%s%s\n",
2103  s->avctx->framerate.den, s->avctx->framerate.num,
2104  ctx->time_increment_bits,
2105  s->quant_precision,
2106  s->progressive_sequence,
2107  s->low_delay,
2108  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2109  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2110  );
2111  }
2112 
2113  return 0;
2114 }
2115 
2116 /**
2117  * Decode the user data stuff in the header.
2118  * Also initializes divx/xvid/lavc_version/build.
2119  */
2120 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2121 {
2122  MpegEncContext *s = &ctx->m;
2123  char buf[256];
2124  int i;
2125  int e;
2126  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2127  char last;
2128 
2129  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2130  if (show_bits(gb, 23) == 0)
2131  break;
2132  buf[i] = get_bits(gb, 8);
2133  }
2134  buf[i] = 0;
2135 
2136  /* divx detection */
2137  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2138  if (e < 2)
2139  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2140  if (e >= 2) {
2141  ctx->divx_version = ver;
2142  ctx->divx_build = build;
2143  s->divx_packed = e == 3 && last == 'p';
2144  }
2145 
2146  /* libavcodec detection */
2147  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2148  if (e != 4)
2149  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2150  if (e != 4) {
2151  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2152  if (e > 1) {
2153  if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2154  av_log(s->avctx, AV_LOG_WARNING,
2155  "Unknown Lavc version string encountered, %d.%d.%d; "
2156  "clamping sub-version values to 8-bits.\n",
2157  ver, ver2, ver3);
2158  }
2159  build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2160  }
2161  }
2162  if (e != 4) {
2163  if (strcmp(buf, "ffmpeg") == 0)
2164  ctx->lavc_build = 4600;
2165  }
2166  if (e == 4)
2167  ctx->lavc_build = build;
2168 
2169  /* Xvid detection */
2170  e = sscanf(buf, "XviD%d", &build);
2171  if (e == 1)
2172  ctx->xvid_build = build;
2173 
2174  return 0;
2175 }
2176 
2177 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2178 {
2179  Mpeg4DecContext *ctx = avctx->priv_data;
2180  MpegEncContext *s = &ctx->m;
2181 
2182  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2183  if (s->codec_tag == AV_RL32("XVID") ||
2184  s->codec_tag == AV_RL32("XVIX") ||
2185  s->codec_tag == AV_RL32("RMP4") ||
2186  s->codec_tag == AV_RL32("ZMP4") ||
2187  s->codec_tag == AV_RL32("SIPP"))
2188  ctx->xvid_build = 0;
2189  }
2190 
2191  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2192  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2193  ctx->vol_control_parameters == 0)
2194  ctx->divx_version = 400; // divx 4
2195 
2196  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2197  ctx->divx_version =
2198  ctx->divx_build = -1;
2199  }
2200 
2201  if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2202  if (s->codec_tag == AV_RL32("XVIX"))
2203  s->workaround_bugs |= FF_BUG_XVID_ILACE;
2204 
2205  if (s->codec_tag == AV_RL32("UMP4"))
2206  s->workaround_bugs |= FF_BUG_UMP4;
2207 
2208  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2209  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2210 
2211  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2212  s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2213 
2214  if (ctx->xvid_build <= 3U)
2215  s->padding_bug_score = 256 * 256 * 256 * 64;
2216 
2217  if (ctx->xvid_build <= 1U)
2218  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2219 
2220  if (ctx->xvid_build <= 12U)
2221  s->workaround_bugs |= FF_BUG_EDGE;
2222 
2223  if (ctx->xvid_build <= 32U)
2224  s->workaround_bugs |= FF_BUG_DC_CLIP;
2225 
2226 #define SET_QPEL_FUNC(postfix1, postfix2) \
2227  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2228  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2229  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2230 
2231  if (ctx->lavc_build < 4653U)
2232  s->workaround_bugs |= FF_BUG_STD_QPEL;
2233 
2234  if (ctx->lavc_build < 4655U)
2235  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2236 
2237  if (ctx->lavc_build < 4670U)
2238  s->workaround_bugs |= FF_BUG_EDGE;
2239 
2240  if (ctx->lavc_build <= 4712U)
2241  s->workaround_bugs |= FF_BUG_DC_CLIP;
2242 
2243  if ((ctx->lavc_build&0xFF) >= 100) {
2244  if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2245  (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2246  )
2247  s->workaround_bugs |= FF_BUG_IEDGE;
2248  }
2249 
2250  if (ctx->divx_version >= 0)
2251  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2252  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2253  s->padding_bug_score = 256 * 256 * 256 * 64;
2254 
2255  if (ctx->divx_version < 500U)
2256  s->workaround_bugs |= FF_BUG_EDGE;
2257 
2258  if (ctx->divx_version >= 0)
2259  s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2260  }
2261 
2262  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2263  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2264  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2265  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2266  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2267  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2268  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2269 
2270  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2271  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2272  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2273  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2274  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2275  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2276  }
2277 
2278  if (avctx->debug & FF_DEBUG_BUGS)
2279  av_log(s->avctx, AV_LOG_DEBUG,
2280  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2281  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2282  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2283 
2284  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2285  s->codec_id == AV_CODEC_ID_MPEG4 &&
2286  avctx->idct_algo == FF_IDCT_AUTO) {
2287  avctx->idct_algo = FF_IDCT_XVID;
2288  ff_mpv_idct_init(s);
2289  return 1;
2290  }
2291 
2292  return 0;
2293 }
2294 
2295 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2296 {
2297  MpegEncContext *s = &ctx->m;
2298  int time_incr, time_increment;
2299  int64_t pts;
2300 
2301  s->mcsel = 0;
2302  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2303  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2304  ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2305  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2306  s->low_delay = 0;
2307  }
2308 
2309  s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2310  if (s->partitioned_frame)
2311  s->decode_mb = mpeg4_decode_partitioned_mb;
2312  else
2313  s->decode_mb = mpeg4_decode_mb;
2314 
2315  time_incr = 0;
2316  while (get_bits1(gb) != 0)
2317  time_incr++;
2318 
2319  check_marker(s->avctx, gb, "before time_increment");
2320 
2321  if (ctx->time_increment_bits == 0 ||
2322  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2323  av_log(s->avctx, AV_LOG_WARNING,
2324  "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);
2325 
2326  for (ctx->time_increment_bits = 1;
2327  ctx->time_increment_bits < 16;
2328  ctx->time_increment_bits++) {
2329  if (s->pict_type == AV_PICTURE_TYPE_P ||
2330  (s->pict_type == AV_PICTURE_TYPE_S &&
2331  ctx->vol_sprite_usage == GMC_SPRITE)) {
2332  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2333  break;
2334  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2335  break;
2336  }
2337 
2338  av_log(s->avctx, AV_LOG_WARNING,
2339  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2340  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2341  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2342  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2343  }
2344  }
2345 
2346  if (IS_3IV1)
2347  time_increment = get_bits1(gb); // FIXME investigate further
2348  else
2349  time_increment = get_bits(gb, ctx->time_increment_bits);
2350 
2351  if (s->pict_type != AV_PICTURE_TYPE_B) {
2352  s->last_time_base = s->time_base;
2353  s->time_base += time_incr;
2354  s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2355  if (s->workaround_bugs & FF_BUG_UMP4) {
2356  if (s->time < s->last_non_b_time) {
2357  /* header is not mpeg-4-compatible, broken encoder,
2358  * trying to workaround */
2359  s->time_base++;
2360  s->time += s->avctx->framerate.num;
2361  }
2362  }
2363  s->pp_time = s->time - s->last_non_b_time;
2364  s->last_non_b_time = s->time;
2365  } else {
2366  s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2367  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2368  if (s->pp_time <= s->pb_time ||
2369  s->pp_time <= s->pp_time - s->pb_time ||
2370  s->pp_time <= 0) {
2371  /* messed up order, maybe after seeking? skipping current B-frame */
2372  return FRAME_SKIPPED;
2373  }
2374  ff_mpeg4_init_direct_mv(s);
2375 
2376  if (ctx->t_frame == 0)
2377  ctx->t_frame = s->pb_time;
2378  if (ctx->t_frame == 0)
2379  ctx->t_frame = 1; // 1/0 protection
2380  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2381  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2382  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2383  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2384  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2385  s->pb_field_time = 2;
2386  s->pp_field_time = 4;
2387  if (!s->progressive_sequence)
2388  return FRAME_SKIPPED;
2389  }
2390  }
2391 
2392  if (s->avctx->framerate.den)
2393  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2394  else
2395  pts = AV_NOPTS_VALUE;
2396  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2397 
2398  check_marker(s->avctx, gb, "before vop_coded");
2399 
2400  /* vop coded */
2401  if (get_bits1(gb) != 1) {
2402  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2403  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2404  return FRAME_SKIPPED;
2405  }
2406  if (ctx->new_pred)
2407  decode_new_pred(ctx, gb);
2408 
2409  if (ctx->shape != BIN_ONLY_SHAPE &&
2410  (s->pict_type == AV_PICTURE_TYPE_P ||
2411  (s->pict_type == AV_PICTURE_TYPE_S &&
2412  ctx->vol_sprite_usage == GMC_SPRITE))) {
2413  /* rounding type for motion estimation */
2414  s->no_rounding = get_bits1(gb);
2415  } else {
2416  s->no_rounding = 0;
2417  }
2418  // FIXME reduced res stuff
2419 
2420  if (ctx->shape != RECT_SHAPE) {
2421  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2422  skip_bits(gb, 13); /* width */
2423  check_marker(s->avctx, gb, "after width");
2424  skip_bits(gb, 13); /* height */
2425  check_marker(s->avctx, gb, "after height");
2426  skip_bits(gb, 13); /* hor_spat_ref */
2427  check_marker(s->avctx, gb, "after hor_spat_ref");
2428  skip_bits(gb, 13); /* ver_spat_ref */
2429  }
2430  skip_bits1(gb); /* change_CR_disable */
2431 
2432  if (get_bits1(gb) != 0)
2433  skip_bits(gb, 8); /* constant_alpha_value */
2434  }
2435 
2436  // FIXME complexity estimation stuff
2437 
2438  if (ctx->shape != BIN_ONLY_SHAPE) {
2439  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2440  if (s->pict_type != AV_PICTURE_TYPE_I)
2441  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2442  if (s->pict_type == AV_PICTURE_TYPE_B)
2443  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2444 
2445  if (get_bits_left(gb) < 3) {
2446  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2447  return AVERROR_INVALIDDATA;
2448  }
2449  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2450  if (!s->progressive_sequence) {
2451  s->top_field_first = get_bits1(gb);
2452  s->alternate_scan = get_bits1(gb);
2453  } else
2454  s->alternate_scan = 0;
2455  }
2456 
2457  if (s->alternate_scan) {
2458  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2459  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2460  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2461  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2462  } else {
2463  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2464  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2465  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2466  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2467  }
2468 
2469  if (s->pict_type == AV_PICTURE_TYPE_S) {
2470  if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2471  ctx->vol_sprite_usage == GMC_SPRITE)) {
2472  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2473  return AVERROR_INVALIDDATA;
2474  if (ctx->sprite_brightness_change)
2475  av_log(s->avctx, AV_LOG_ERROR,
2476  "sprite_brightness_change not supported\n");
2477  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2478  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2479  } else {
2480  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2481  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2482  }
2483  }
2484 
2485  if (ctx->shape != BIN_ONLY_SHAPE) {
2486  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2487  if (s->qscale == 0) {
2488  av_log(s->avctx, AV_LOG_ERROR,
2489  "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2490  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2491  }
2492 
2493  if (s->pict_type != AV_PICTURE_TYPE_I) {
2494  s->f_code = get_bits(gb, 3); /* fcode_for */
2495  if (s->f_code == 0) {
2496  av_log(s->avctx, AV_LOG_ERROR,
2497  "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2498  s->f_code = 1;
2499  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2500  }
2501  } else
2502  s->f_code = 1;
2503 
2504  if (s->pict_type == AV_PICTURE_TYPE_B) {
2505  s->b_code = get_bits(gb, 3);
2506  if (s->b_code == 0) {
2507  av_log(s->avctx, AV_LOG_ERROR,
2508  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2509  s->b_code=1;
2510  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2511  }
2512  } else
2513  s->b_code = 1;
2514 
2515  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2516  av_log(s->avctx, AV_LOG_DEBUG,
2517  "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",
2518  s->qscale, s->f_code, s->b_code,
2519  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")),
2520  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2521  s->top_field_first, s->quarter_sample ? "q" : "h",
2522  s->data_partitioning, ctx->resync_marker,
2523  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2524  1 - s->no_rounding, s->vo_type,
2525  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2526  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2527  ctx->cplx_estimation_trash_b,
2528  s->time,
2529  time_increment
2530  );
2531  }
2532 
2533  if (!ctx->scalability) {
2534  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2535  skip_bits1(gb); // vop shape coding type
2536  } else {
2537  if (ctx->enhancement_type) {
2538  int load_backward_shape = get_bits1(gb);
2539  if (load_backward_shape)
2540  av_log(s->avctx, AV_LOG_ERROR,
2541  "load backward shape isn't supported\n");
2542  }
2543  skip_bits(gb, 2); // ref_select_code
2544  }
2545  }
2546  /* detect buggy encoders which don't set the low_delay flag
2547  * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2548  * easily (although it's buggy too) */
2549  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2550  ctx->divx_version == -1 && s->picture_number == 0) {
2551  av_log(s->avctx, AV_LOG_WARNING,
2552  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2553  s->low_delay = 1;
2554  }
2555 
2556  s->picture_number++; // better than pic number==0 always ;)
2557 
2558  // FIXME add short header support
2559  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2560  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2561 
2562  if (s->workaround_bugs & FF_BUG_EDGE) {
2563  s->h_edge_pos = s->width;
2564  s->v_edge_pos = s->height;
2565  }
2566  return 0;
2567 }
2568 
2569 /**
2570  * Decode MPEG-4 headers.
2571  * @return <0 if no VOP found (or a damaged one)
2572  * FRAME_SKIPPED if a not coded VOP is found
2573  * 0 if a VOP is found
2574  */
2575 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2576 {
2577  MpegEncContext *s = &ctx->m;
2578  unsigned startcode, v;
2579  int ret;
2580  int vol = 0;
2581 
2582  /* search next start code */
2583  align_get_bits(gb);
2584 
2585  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2586  skip_bits(gb, 24);
2587  if (get_bits(gb, 8) == 0xF0)
2588  goto end;
2589  }
2590 
2591  startcode = 0xff;
2592  for (;;) {
2593  if (get_bits_count(gb) >= gb->size_in_bits) {
2594  if (gb->size_in_bits == 8 &&
2595  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2596  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2597  return FRAME_SKIPPED; // divx bug
2598  } else
2599  return -1; // end of stream
2600  }
2601 
2602  /* use the bits after the test */
2603  v = get_bits(gb, 8);
2604  startcode = ((startcode << 8) | v) & 0xffffffff;
2605 
2606  if ((startcode & 0xFFFFFF00) != 0x100)
2607  continue; // no startcode
2608 
2609  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2610  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2611  if (startcode <= 0x11F)
2612  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2613  else if (startcode <= 0x12F)
2614  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2615  else if (startcode <= 0x13F)
2616  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2617  else if (startcode <= 0x15F)
2618  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2619  else if (startcode <= 0x1AF)
2620  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2621  else if (startcode == 0x1B0)
2622  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2623  else if (startcode == 0x1B1)
2624  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2625  else if (startcode == 0x1B2)
2626  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2627  else if (startcode == 0x1B3)
2628  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2629  else if (startcode == 0x1B4)
2630  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2631  else if (startcode == 0x1B5)
2632  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2633  else if (startcode == 0x1B6)
2634  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2635  else if (startcode == 0x1B7)
2636  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2637  else if (startcode == 0x1B8)
2638  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2639  else if (startcode == 0x1B9)
2640  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2641  else if (startcode == 0x1BA)
2642  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2643  else if (startcode == 0x1BB)
2644  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2645  else if (startcode == 0x1BC)
2646  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2647  else if (startcode == 0x1BD)
2648  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2649  else if (startcode == 0x1BE)
2650  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2651  else if (startcode == 0x1BF)
2652  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2653  else if (startcode == 0x1C0)
2654  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2655  else if (startcode == 0x1C1)
2656  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2657  else if (startcode == 0x1C2)
2658  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2659  else if (startcode == 0x1C3)
2660  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2661  else if (startcode <= 0x1C5)
2662  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2663  else if (startcode <= 0x1FF)
2664  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2665  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2666  }
2667 
2668  if (startcode >= 0x120 && startcode <= 0x12F) {
2669  if (vol) {
2670  av_log(s->avctx, AV_LOG_ERROR, "Multiple VOL headers");
2671  return AVERROR_INVALIDDATA;
2672  }
2673  vol++;
2674  if ((ret = decode_vol_header(ctx, gb)) < 0)
2675  return ret;
2676  } else if (startcode == USER_DATA_STARTCODE) {
2677  decode_user_data(ctx, gb);
2678  } else if (startcode == GOP_STARTCODE) {
2679  mpeg4_decode_gop_header(s, gb);
2680  } else if (startcode == VOS_STARTCODE) {
2681  mpeg4_decode_profile_level(s, gb);
2682  } else if (startcode == VOP_STARTCODE) {
2683  break;
2684  }
2685 
2686  align_get_bits(gb);
2687  startcode = 0xff;
2688  }
2689 
2690 end:
2691  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2692  s->low_delay = 1;
2693  s->avctx->has_b_frames = !s->low_delay;
2694 
2695  return decode_vop_header(ctx, gb);
2696 }
2697 
2698 av_cold void ff_mpeg4videodec_static_init(void) {
2699  static int done = 0;
2700 
2701  if (!done) {
2702  ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2703  ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2704  ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2705  INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2706  INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2707  INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2708  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2709  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2710  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2711  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2712  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2713  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2714  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2715  &ff_sprite_trajectory_tab[0][1], 4, 2,
2716  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2717  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2718  &ff_mb_type_b_tab[0][1], 2, 1,
2719  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2720  done = 1;
2721  }
2722 }
2723 
2724 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2725 {
2726  Mpeg4DecContext *ctx = avctx->priv_data;
2727  MpegEncContext *s = &ctx->m;
2728 
2729  /* divx 5.01+ bitstream reorder stuff */
2730  /* Since this clobbers the input buffer and hwaccel codecs still need the
2731  * data during hwaccel->end_frame we should not do this any earlier */
2732  if (s->divx_packed) {
2733  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2734  int startcode_found = 0;
2735 
2736  if (buf_size - current_pos > 7) {
2737 
2738  int i;
2739  for (i = current_pos; i < buf_size - 4; i++)
2740 
2741  if (buf[i] == 0 &&
2742  buf[i + 1] == 0 &&
2743  buf[i + 2] == 1 &&
2744  buf[i + 3] == 0xB6) {
2745  startcode_found = !(buf[i + 4] & 0x40);
2746  break;
2747  }
2748  }
2749 
2750  if (startcode_found) {
2751  if (!ctx->showed_packed_warning) {
2752  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2753  "wasteful way to store B-frames ('packed B-frames'). "
2754  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2755  ctx->showed_packed_warning = 1;
2756  }
2757  av_fast_padded_malloc(&s->bitstream_buffer,
2758  &s->allocated_bitstream_buffer_size,
2759  buf_size - current_pos);
2760  if (!s->bitstream_buffer) {
2761  s->bitstream_buffer_size = 0;
2762  return AVERROR(ENOMEM);
2763  }
2764  memcpy(s->bitstream_buffer, buf + current_pos,
2765  buf_size - current_pos);
2766  s->bitstream_buffer_size = buf_size - current_pos;
2767  }
2768  }
2769 
2770  return 0;
2771 }
2772 
2773 #if HAVE_THREADS
2774 static int mpeg4_update_thread_context(AVCodecContext *dst,
2775  const AVCodecContext *src)
2776 {
2777  Mpeg4DecContext *s = dst->priv_data;
2778  const Mpeg4DecContext *s1 = src->priv_data;
2779  int init = s->m.context_initialized;
2780 
2781  int ret = ff_mpeg_update_thread_context(dst, src);
2782 
2783  if (ret < 0)
2784  return ret;
2785 
2786  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2787 
2788  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2789  ff_xvid_idct_init(&s->m.idsp, dst);
2790 
2791  return 0;
2792 }
2793 #endif
2794 
2795 static av_cold int decode_init(AVCodecContext *avctx)
2796 {
2797  Mpeg4DecContext *ctx = avctx->priv_data;
2798  MpegEncContext *s = &ctx->m;
2799  int ret;
2800 
2801  ctx->divx_version =
2802  ctx->divx_build =
2803  ctx->xvid_build =
2804  ctx->lavc_build = -1;
2805 
2806  if ((ret = ff_h263_decode_init(avctx)) < 0)
2807  return ret;
2808 
2809  ff_mpeg4videodec_static_init();
2810 
2811  s->h263_pred = 1;
2812  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2813  s->decode_mb = mpeg4_decode_mb;
2814  ctx->time_increment_bits = 4; /* default value for broken headers */
2815 
2816  avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2817  avctx->internal->allocate_progress = 1;
2818 
2819  return 0;
2820 }
2821 
2822 static const AVOption mpeg4_options[] = {
2823  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2824  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2825  {NULL}
2826 };
2827 
2828 static const AVClass mpeg4_class = {
2829  "MPEG4 Video Decoder",
2830  av_default_item_name,
2831  mpeg4_options,
2832  LIBAVUTIL_VERSION_INT,
2833 };
2834 
2835 AVCodec ff_mpeg4_decoder = {
2836  .name = "mpeg4",
2837  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2838  .type = AVMEDIA_TYPE_VIDEO,
2839  .id = AV_CODEC_ID_MPEG4,
2840  .priv_data_size = sizeof(Mpeg4DecContext),
2841  .init = decode_init,
2842  .close = ff_h263_decode_end,
2843  .decode = ff_h263_decode_frame,
2844  .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2845  AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2846  AV_CODEC_CAP_FRAME_THREADS,
2847  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2848  .flush = ff_mpeg_flush,
2849  .max_lowres = 3,
2850  .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2851  .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
2852  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2853  .priv_class = &mpeg4_class,
2854 };
2855 
2856 
2857 #if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
2858 static const AVClass mpeg4_vdpau_class = {
2859  "MPEG4 Video VDPAU Decoder",
2860  av_default_item_name,
2861  mpeg4_options,
2862  LIBAVUTIL_VERSION_INT,
2863 };
2864 
2865 AVCodec ff_mpeg4_vdpau_decoder = {
2866  .name = "mpeg4_vdpau",
2867  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2868  .type = AVMEDIA_TYPE_VIDEO,
2869  .id = AV_CODEC_ID_MPEG4,
2870  .priv_data_size = sizeof(Mpeg4DecContext),
2871  .init = decode_init,
2872  .close = ff_h263_decode_end,
2873  .decode = ff_h263_decode_frame,
2874  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2875  AV_CODEC_CAP_HWACCEL_VDPAU,
2876  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2877  AV_PIX_FMT_NONE },
2878  .priv_class = &mpeg4_vdpau_class,
2879 };
2880 #endif
MpegEncContext::bitstream_buffer_size
int bitstream_buffer_size
Definition: mpegvideo.h:414
show_bits_long
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Show 0-32 bits.
Definition: get_bits.h:397
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Definition: mpeg4video.h:75
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consider things that a sane encoder should not do as an error
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Definition: error.h:59
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Definition: mpegvideo.h:90
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Definition: avutil.h:277
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Definition: mpeg4data.h:109
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Definition: opt.h:246
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Definition: mpegvideo.h:269
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Definition: mpegvideo.h:504
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Read 1-25 bits.
Definition: get_bits.h:261
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Definition: log.h:182
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#define LIBAVUTIL_VERSION_INT
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VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
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int resync_marker
could this stream contain resync markers
Definition: mpeg4video.h:82
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Definition: vlc.h:75
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Definition: mpeg4videodec.c:1716
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used for MPEG-4 AC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:191
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Definition: ituh263dec.c:100
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Definition: get_bits.h:167
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Definition: mpeg4data.h:214
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Definition: get_bits.h:407
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Definition: rational.h:59
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Definition: mpegvideo.h:413
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enum AVCodecID codec_id
Definition: mpegvideo.h:109
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Definition: avcodec.h:3035
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Definition: blockdsp.h:37
FF_BUG_HPEL_CHROMA
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2933
GetBitContext::buffer
const uint8_t * buffer
Definition: get_bits.h:56
ff_mpeg4_pred_ac
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:63
av_log2
int av_log2(unsigned v)
Definition: intmath.c:26
AVCodecContext::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:2143
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: mpeg4videodec.c:2795
MB_TYPE_INTRA
#define MB_TYPE_INTRA
Definition: mpegutils.h:75
av_fast_padded_malloc
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:120
MpegEncContext::real_sprite_warping_points
int real_sprite_warping_points
Definition: mpegvideo.h:394
AV_CODEC_ID_MPEG4
Definition: avcodec.h:232
AV_EF_BITSTREAM
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:3029
mpegvideo.h
mpegvideo header.
FF_ASPECT_EXTENDED
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1937
DC_VLC_BITS
#define DC_VLC_BITS
Definition: mpeg4videodec.c:44
DC_MARKER
#define DC_MARKER
Definition: mpeg4video.h:54
ScanTable::permutated
uint8_t permutated[64]
Definition: idctdsp.h:33
run
uint8_t run
Definition: svq3.c:206
ER_MV_ERROR
#define ER_MV_ERROR
Definition: error_resilience.h:32
MpegEncContext::padding_bug_score
int padding_bug_score
used to detect the VERY common padding bug in MPEG-4
Definition: mpegvideo.h:409
ff_thread_await_progress
void ff_thread_await_progress(ThreadFrame *f, int n, int field)
Wait for earlier decoding threads to finish reference pictures.
Definition: pthread_frame.c:580
SLICE_OK
#define SLICE_OK
Definition: mpegvideo.h:501
MpegEncContext::mb_num
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:130
src
#define src
Definition: vp8dsp.c:254
AVCodecContext::profile
int profile
profile
Definition: avcodec.h:3235
AVCodec
AVCodec.
Definition: avcodec.h:3681
MpegEncContext::time_base
int time_base
time in seconds of last I,P,S Frame
Definition: mpegvideo.h:387
RLTable
RLTable.
Definition: rl.h:39
MpegEncContext::qscale
int qscale
QP.
Definition: mpegvideo.h:201
ff_mpeg4_video_profiles
const AVProfile ff_mpeg4_video_profiles[]
Definition: profiles.c:107
ff_h263_pred_motion
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:307
MpegEncContext::field_select
int field_select[2][2]
Definition: mpegvideo.h:277
MpegEncContext::block_wrap
int block_wrap[6]
Definition: mpegvideo.h:294
MpegEncContext::quant_precision
int quant_precision
Definition: mpegvideo.h:398
ff_clean_intra_table_entries
void ff_clean_intra_table_entries(MpegEncContext *s)
Clean dc, ac, coded_block for the current non-intra MB.
Definition: mpegvideo.c:2433
AVCodecContext::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1869
Mpeg4DecContext::vol_sprite_usage
int vol_sprite_usage
Definition: mpeg4video.h:71
block
static int16_t block[64]
Definition: dct.c:115
ff_mpeg4_workaround_bugs
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
Definition: mpeg4videodec.c:2177
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:1019
USES_LIST
#define USES_LIST(a, list)
Definition: mpegutils.h:101
USER_DATA_STARTCODE
#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:359
RLTable::max_run
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:47
avpriv_request_sample
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
MV_DIRECT
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (MPEG-4) ...
Definition: mpegvideo.h:264
bits
uint8_t bits
Definition: crc.c:296
uint8_t
uint8_t
Definition: audio_convert.c:194
av_cold
#define av_cold
Definition: attributes.h:82
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
mpeg4_decode_mb
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: mpeg4videodec.c:1337
delta
float delta
Definition: vorbis_enc_data.h:457
opt.h
AVOptions.
ff_mpeg4_resync_prefix
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2974
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:170
MpegEncContext::pred_dir_table
uint8_t * pred_dir_table
used to store pred_dir for partitioned decoding
Definition: mpegvideo.h:197
thread.h
Multithreading support functions.
AV_CODEC_FLAG_LOW_DELAY
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:913
FF_BUG_EDGE
#define FF_BUG_EDGE
Definition: avcodec.h:2932
MpegEncContext::interlaced_dct
int interlaced_dct
Definition: mpegvideo.h:481
MpegEncContext::current_picture
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:177
CHROMA_420
#define CHROMA_420
Definition: mpegvideo.h:473
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
height
#define height
decode_user_data
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
Definition: mpeg4videodec.c:2120
FF_BUG_QPEL_CHROMA2
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:2930
FF_BUG_STD_QPEL
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2929
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
RLTable::max_level
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:46
AV_CODEC_CAP_HWACCEL_VDPAU
#define AV_CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:1030
ER_MV_END
#define ER_MV_END
Definition: error_resilience.h:35
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:330
MpegEncContext::mb_height
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:126
MpegEncContext::codec_tag
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:117
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:2476
MAX_LEVEL
#define MAX_LEVEL
Definition: rl.h:36
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:180
FF_BUG_IEDGE
#define FF_BUG_IEDGE
Definition: avcodec.h:2937
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:731
FF_IDCT_AUTO
#define FF_IDCT_AUTO
Definition: avcodec.h:3092
ff_set_qscale
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2804
Mpeg4DecContext::m
MpegEncContext m
Definition: mpeg4video.h:66
MpegEncContext::sprite_offset
int sprite_offset[2][2]
sprite offset[isChroma][isMVY]
Definition: mpegvideo.h:395
ROUNDED_DIV
#define ROUNDED_DIV(a, b)
Definition: common.h:56
Picture::tf
ThreadFrame tf
Definition: mpegpicture.h:47
FF_BUG_DIRECT_BLOCKSIZE
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2931
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
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:587
FF_IDCT_XVID
#define FF_IDCT_XVID
Definition: avcodec.h:3105
MpegEncContext::dc_val
int16_t * dc_val[3]
used for MPEG-4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:184
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:160
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:2054
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:834
MpegEncContext::mb_skipped
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:192
av_default_item_name
av_default_item_name
Definition: libopenh264enc.c:78
MpegEncContext::partitioned_frame
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:403
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:918
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:179
MpegEncContext::er
ERContext er
Definition: mpegvideo.h:551
get_amv
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
Definition: mpeg4videodec.c:531
r
const char * r
Definition: vf_curves.c:111
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:1827
SIMPLE_VO_TYPE
#define SIMPLE_VO_TYPE
Definition: mpeg4video.h:38
INTER_MCBPC_VLC_BITS
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:40
FF_BUG_NO_PADDING
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2923
FF_DEBUG_BUGS
#define FF_DEBUG_BUGS
Definition: avcodec.h:2993
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:3688
IS_SKIP
#define IS_SKIP(a)
Definition: mpegutils.h:83
MpegEncContext::quarter_sample
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:399
MpegEncContext::low_delay
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:404
SET_QPEL_FUNC
#define SET_QPEL_FUNC(postfix1, postfix2)
MpegEncContext::gb
GetBitContext gb
Definition: mpegvideo.h:446
MpegEncContext::decode_mb
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:500
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:131
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:1057
GET_RL_VLC
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
Definition: get_bits.h:509
VLC
Definition: vlc.h:26
ff_mpeg_flush
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2773
SKIP_BITS
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:175
ONLY_IF_THREADS_ENABLED
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:218
MpegEncContext::resync_mb_x
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:356
ff_alternate_horizontal_scan
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideodata.c:89
ff_h263_decode_init
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:62
internal.h
common internal API header
MpegEncContext::sprite_delta
int sprite_delta[2][2]
sprite_delta [isY][isMVY]
Definition: mpegvideo.h:396
ADV_SIMPLE_VO_TYPE
#define ADV_SIMPLE_VO_TYPE
Definition: mpeg4video.h:44
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:1298
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:988
mpeg4_decode_sprite_trajectory
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:168
AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
mb_type_b_map
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:51
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:3020
MB_TYPE_DIRECT2
#define MB_TYPE_DIRECT2
Definition: avcodec.h:1296
FFMIN
#define FFMIN(a, b)
Definition: common.h: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:86
dc_lum
static VLC dc_lum
Definition: mpeg4videodec.c:47
width
#define width
mpeg4_decode_partition_a
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
Definition: mpeg4videodec.c:631
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:3091
mpeg4_decode_dc
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
Definition: mpeg4videodec.c:584
MB_TYPE_INTERLACED
#define MB_TYPE_INTERLACED
Definition: avcodec.h:1295
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:34
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:2835
MpegEncContext::allocated_bitstream_buffer_size
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:415
GetBitContext::size_in_bits
int size_in_bits
Definition: get_bits.h:58
ctx
AVFormatContext * ctx
Definition: movenc.c:48
Mpeg4DecContext::use_intra_dc_vlc
int use_intra_dc_vlc
Definition: mpeg4video.h:89
AV_OPT_TYPE_BOOL
Definition: opt.h:240
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:296
MB_TYPE_L0L1
#define MB_TYPE_L0L1
Definition: avcodec.h:1306
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
AVCodecContext::level
int level
level
Definition: avcodec.h:3333
ff_mpeg4_decode_video_packet_header
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
Definition: mpeg4videodec.c:437
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:181
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:554
MpegEncContext::block_last_index
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:83
n
int n
Definition: avisynth_c.h:684
MB_TYPE_ACPRED
#define MB_TYPE_ACPRED
Definition: avcodec.h:1297
IDCTDSPContext::idct_permutation
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:96
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:1878
MB_TYPE_L1
#define MB_TYPE_L1
Definition: avcodec.h:1305
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
FRAME_SKIPPED
#define FRAME_SKIPPED
Return value for header parsers if frame is not coded.
Definition: mpegutils.h:34
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:195
FF_BUG_QPEL_CHROMA
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2928
ff_mpeg_update_thread_context
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:483
RLTable::rl_vlc
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:193
SPRITE_TRAJ_VLC_BITS
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:43
FF_BUG_UMP4
#define FF_BUG_UMP4
Definition: avcodec.h:2922
MpegEncContext::block_index
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:293
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
MV_TYPE_16X16
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
MpegEncContext::first_slice_line
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:434
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:1252
MV_DIR_BACKWARD
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:263
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
MpegEncContext::bdsp
BlockDSPContext bdsp
Definition: mpegvideo.h:223
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:2973
error_resilience.h
AVCodecContext
main external API structure.
Definition: avcodec.h:1732
decode_vop_header
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:2295
FASTDIV
#define FASTDIV(a, b)
Definition: mathops.h:202
RSHIFT
#define RSHIFT(a, b)
Definition: common.h:54
MpegEncContext::intra_scantable
ScanTable intra_scantable
Definition: mpegvideo.h:88
MpegEncContext::height
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
get_xbits
static int get_xbits(GetBitContext *s, int n)
Read MPEG-1 dc-style VLC (sign bit + mantissa with no MSB).
Definition: get_bits.h:218
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:120
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:39
buf
void * buf
Definition: avisynth_c.h:690
AV_PIX_FMT_VDPAU_MPEG4
MPEG-4 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstr...
Definition: pixfmt.h:146
SLICE_END
#define SLICE_END
end marker found
Definition: mpegvideo.h:503
MpegEncContext::data_partitioning
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:402
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:454
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:313
skip_bits1
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:338
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
MpegEncContext::intra_h_scantable
ScanTable intra_h_scantable
Definition: mpegvideo.h:89
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:306
profiles
static const AVProfile profiles[]
Definition: libfdk-aacenc.c:378
MpegEncContext::cbp_table
uint8_t * cbp_table
used to store cbp, ac_pred for partitioned decoding
Definition: mpegvideo.h:196
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
ff_mpeg4_decode_picture_header
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode MPEG-4 headers.
Definition: mpeg4videodec.c:2575
MpegEncContext::context_initialized
int context_initialized
Definition: mpegvideo.h:121
GET_CACHE
#define GET_CACHE(name, gb)
Definition: get_bits.h:197
AV_EF_IGNORE_ERR
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:3033
MB_TYPE_16x16
#define MB_TYPE_16x16
Definition: avcodec.h:1291
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:162
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:31
AVCodecInternal::allocate_progress
int allocate_progress
Whether to allocate progress for frame threading.
Definition: internal.h:126
MpegEncContext::f_code
int f_code
forward MV resolution
Definition: mpegvideo.h:235
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:346
ff_mpeg4_set_direct_mv
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
Mpeg4DecContext::sprite_shift
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:77
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
MpegEncContext::pict_type
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:262
AV_CODEC_CAP_TRUNCATED
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:995
ff_mpeg4_dc_threshold
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
FF_BUG_AUTODETECT
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2917
MpegEncContext::h263_pred
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:102
pts
static int64_t pts
Global timestamp for the audio frames.
Definition: transcode_aac.c:567
ff_mpeg4_get_video_packet_prefix_length
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
ff_h263_pixel_aspect
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
level
uint8_t level
Definition: svq3.c:207
MpegEncContext::mv
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:276
MpegEncContext::b8_stride
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:128
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:78
MpegEncContext::next_picture_ptr
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:180
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
Picture::qscale_table
int8_t * qscale_table
Definition: mpegpicture.h:50
MAX_RUN
#define MAX_RUN
Definition: rl.h:35
MpegEncContext::avctx
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
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:118
SHOW_SBITS
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:194
sprite_trajectory
static VLC sprite_trajectory
Definition: mpeg4videodec.c:48
stride
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
FF_BUG_AMV
#define FF_BUG_AMV
Definition: avcodec.h:2924
mpeg4_options
static const AVOption mpeg4_options[]
Definition: mpeg4videodec.c:2822
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:127
if
if(ret< 0)
Definition: vf_mcdeint.c:282
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:60
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dv.h:93
dc_chrom
static VLC dc_chrom
Definition: mpeg4videodec.c:47
MB_TYPE_8x8
#define MB_TYPE_8x8
Definition: avcodec.h:1294
AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
mb_type_b_vlc
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:49
mpeg4_decode_partition_b
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
Definition: mpeg4videodec.c:825
AVRational::den
int den
Denominator.
Definition: rational.h:60
ff_alternate_vertical_scan
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideodata.c:100
MB_TYPE_16x8
#define MB_TYPE_16x8
Definition: avcodec.h:1292
mpeg4_class
static const AVClass mpeg4_class
Definition: mpeg4videodec.c:2828
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:1774
ff_init_scantable
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
FF_DEBUG_STARTCODE
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2987
IS_8X8
#define IS_8X8(a)
Definition: mpegutils.h:91
len
int len
Definition: vorbis_enc_data.h:452
AVCodecContext::internal
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1782
MpegEncContext::resync_mb_y
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:357
MpegEncContext::block
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:498
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
MpegEncContext::next_picture
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:165
IS_ACPRED
#define IS_ACPRED(a)
Definition: mpegutils.h:96
decode_new_pred
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:421
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:464
mpeg4_decode_profile_level
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
Definition: mpeg4videodec.c:1738
MpegEncContext::chroma_qscale
int chroma_qscale
chroma QP
Definition: mpegvideo.h:202
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:255
av_uninit
#define av_uninit(x)
Definition: attributes.h:148
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
ff_rvlc_rl_intra
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
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:116
decode
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2257
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
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 (H.263, MPEG-4 4MV)
Definition: mpegvideo.h:267
MpegEncContext::b_code
int b_code
backward MV resolution for B-frames (MPEG-4)
Definition: mpegvideo.h:236
FF_BUG_DC_CLIP
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2934
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
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:981
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:994
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
MB_TYPE_L0
#define MB_TYPE_L0
Definition: avcodec.h:1304
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
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
GMC_SPRITE
#define GMC_SPRITE
Definition: mpeg4video.h:51
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