FFmpeg
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 "libavutil/pixdesc.h"
28 #include "error_resilience.h"
29 #include "hwaccel.h"
30 #include "idctdsp.h"
31 #include "internal.h"
32 #include "mpegutils.h"
33 #include "mpegvideo.h"
34 #include "mpegvideodata.h"
35 #include "mpeg4video.h"
36 #include "h263.h"
37 #include "profiles.h"
38 #include "thread.h"
39 #include "xvididct.h"
40 #include "unary.h"
41 
42 /* The defines below define the number of bits that are read at once for
43  * reading vlc values. Changing these may improve speed and data cache needs
44  * be aware though that decreasing them may need the number of stages that is
45  * passed to get_vlc* to be increased. */
46 #define SPRITE_TRAJ_VLC_BITS 6
47 #define DC_VLC_BITS 9
48 #define MB_TYPE_B_VLC_BITS 4
49 #define STUDIO_INTRA_BITS 9
50 
51 static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb);
52 
53 static VLC dc_lum, dc_chrom;
54 static VLC sprite_trajectory;
55 static VLC mb_type_b_vlc;
56 
57 static const int mb_type_b_map[4] = {
58  MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
59  MB_TYPE_L0L1 | MB_TYPE_16x16,
60  MB_TYPE_L1 | MB_TYPE_16x16,
61  MB_TYPE_L0 | MB_TYPE_16x16,
62 };
63 
64 /**
65  * Predict the ac.
66  * @param n block index (0-3 are luma, 4-5 are chroma)
67  * @param dir the ac prediction direction
68  */
69 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
70 {
71  int i;
72  int16_t *ac_val, *ac_val1;
73  int8_t *const qscale_table = s->current_picture.qscale_table;
74 
75  /* find prediction */
76  ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
77  ac_val1 = ac_val;
78  if (s->ac_pred) {
79  if (dir == 0) {
80  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
81  /* left prediction */
82  ac_val -= 16;
83 
84  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
85  n == 1 || n == 3) {
86  /* same qscale */
87  for (i = 1; i < 8; i++)
88  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
89  } else {
90  /* different qscale, we must rescale */
91  for (i = 1; i < 8; i++)
92  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
93  }
94  } else {
95  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
96  /* top prediction */
97  ac_val -= 16 * s->block_wrap[n];
98 
99  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
100  n == 2 || n == 3) {
101  /* same qscale */
102  for (i = 1; i < 8; i++)
103  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
104  } else {
105  /* different qscale, we must rescale */
106  for (i = 1; i < 8; i++)
107  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
108  }
109  }
110  }
111  /* left copy */
112  for (i = 1; i < 8; i++)
113  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
114 
115  /* top copy */
116  for (i = 1; i < 8; i++)
117  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
118 }
119 
120 /**
121  * check if the next stuff is a resync marker or the end.
122  * @return 0 if not
123  */
124 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
125 {
126  MpegEncContext *s = &ctx->m;
127  int bits_count = get_bits_count(&s->gb);
128  int v = show_bits(&s->gb, 16);
129 
130  if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
131  return 0;
132 
133  while (v <= 0xFF) {
134  if (s->pict_type == AV_PICTURE_TYPE_B ||
135  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
136  break;
137  skip_bits(&s->gb, 8 + s->pict_type);
138  bits_count += 8 + s->pict_type;
139  v = show_bits(&s->gb, 16);
140  }
141 
142  if (bits_count + 8 >= s->gb.size_in_bits) {
143  v >>= 8;
144  v |= 0x7F >> (7 - (bits_count & 7));
145 
146  if (v == 0x7F)
147  return s->mb_num;
148  } else {
149  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
150  int len, mb_num;
151  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
152  GetBitContext gb = s->gb;
153 
154  skip_bits(&s->gb, 1);
155  align_get_bits(&s->gb);
156 
157  for (len = 0; len < 32; len++)
158  if (get_bits1(&s->gb))
159  break;
160 
161  mb_num = get_bits(&s->gb, mb_num_bits);
162  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
163  mb_num= -1;
164 
165  s->gb = gb;
166 
167  if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
168  return mb_num;
169  }
170  }
171  return 0;
172 }
173 
174 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
175 {
176  MpegEncContext *s = &ctx->m;
177  int a = 2 << s->sprite_warping_accuracy;
178  int rho = 3 - s->sprite_warping_accuracy;
179  int r = 16 / a;
180  int alpha = 1;
181  int beta = 0;
182  int w = s->width;
183  int h = s->height;
184  int min_ab, i, w2, h2, w3, h3;
185  int sprite_ref[4][2];
186  int virtual_ref[2][2];
187  int64_t sprite_offset[2][2];
188  int64_t sprite_delta[2][2];
189 
190  // only true for rectangle shapes
191  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
192  { 0, s->height }, { s->width, s->height } };
193  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
194 
195  if (w <= 0 || h <= 0)
196  return AVERROR_INVALIDDATA;
197 
198  /* the decoder was not properly initialized and we cannot continue */
199  if (sprite_trajectory.table == NULL)
200  return AVERROR_INVALIDDATA;
201 
202  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
203  int length;
204  int x = 0, y = 0;
205 
206  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
207  if (length > 0)
208  x = get_xbits(gb, length);
209 
210  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
211  check_marker(s->avctx, gb, "before sprite_trajectory");
212 
213  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
214  if (length > 0)
215  y = get_xbits(gb, length);
216 
217  check_marker(s->avctx, gb, "after sprite_trajectory");
218  ctx->sprite_traj[i][0] = d[i][0] = x;
219  ctx->sprite_traj[i][1] = d[i][1] = y;
220  }
221  for (; i < 4; i++)
222  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
223 
224  while ((1 << alpha) < w)
225  alpha++;
226  while ((1 << beta) < h)
227  beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
228  w2 = 1 << alpha;
229  h2 = 1 << beta;
230 
231  // Note, the 4th point isn't used for GMC
232  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
233  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
234  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
235  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
236  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
237  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
238  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
239  } else {
240  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
241  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
242  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
243  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
244  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
245  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
246  }
247  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
248  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
249 
250  /* This is mostly identical to the MPEG-4 std (and is totally unreadable
251  * because of that...). Perhaps it should be reordered to be more readable.
252  * The idea behind this virtual_ref mess is to be able to use shifts later
253  * per pixel instead of divides so the distance between points is converted
254  * from w&h based to w2&h2 based which are of the 2^x form. */
255  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
256  ROUNDED_DIV(((w - w2) *
257  (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
258  w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
259  virtual_ref[0][1] = 16 * vop_ref[0][1] +
260  ROUNDED_DIV(((w - w2) *
261  (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
262  w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
263  virtual_ref[1][0] = 16 * vop_ref[0][0] +
264  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
265  h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
266  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
267  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
268  h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
269 
270  switch (ctx->num_sprite_warping_points) {
271  case 0:
272  sprite_offset[0][0] =
273  sprite_offset[0][1] =
274  sprite_offset[1][0] =
275  sprite_offset[1][1] = 0;
276  sprite_delta[0][0] = a;
277  sprite_delta[0][1] =
278  sprite_delta[1][0] = 0;
279  sprite_delta[1][1] = a;
280  ctx->sprite_shift[0] =
281  ctx->sprite_shift[1] = 0;
282  break;
283  case 1: // GMC only
284  sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
285  sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
286  sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
287  a * (vop_ref[0][0] / 2);
288  sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
289  a * (vop_ref[0][1] / 2);
290  sprite_delta[0][0] = a;
291  sprite_delta[0][1] =
292  sprite_delta[1][0] = 0;
293  sprite_delta[1][1] = a;
294  ctx->sprite_shift[0] =
295  ctx->sprite_shift[1] = 0;
296  break;
297  case 2:
298  sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
299  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
300  ((int64_t) -vop_ref[0][0]) +
301  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
302  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
303  sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
304  ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
305  ((int64_t) -vop_ref[0][0]) +
306  ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
307  ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
308  sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
309  ((int64_t)-2 * vop_ref[0][0] + 1) +
310  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
311  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
312  (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
313  sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
314  ((int64_t)-2 * vop_ref[0][0] + 1) +
315  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
316  ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
317  (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
318  sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
319  sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
320  sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
321  sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
322 
323  ctx->sprite_shift[0] = alpha + rho;
324  ctx->sprite_shift[1] = alpha + rho + 2;
325  break;
326  case 3:
327  min_ab = FFMIN(alpha, beta);
328  w3 = w2 >> min_ab;
329  h3 = h2 >> min_ab;
330  sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
331  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
332  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
333  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
334  sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
335  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
336  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
337  ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
338  sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
339  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
340  (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
341  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
342  sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
343  ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
344  (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
345  ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
346  sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
347  sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
348  sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
349  sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
350 
351  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
352  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
353  break;
354  }
355  /* try to simplify the situation */
356  if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
357  sprite_delta[0][1] == 0 &&
358  sprite_delta[1][0] == 0 &&
359  sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
360  sprite_offset[0][0] >>= ctx->sprite_shift[0];
361  sprite_offset[0][1] >>= ctx->sprite_shift[0];
362  sprite_offset[1][0] >>= ctx->sprite_shift[1];
363  sprite_offset[1][1] >>= ctx->sprite_shift[1];
364  sprite_delta[0][0] = a;
365  sprite_delta[0][1] = 0;
366  sprite_delta[1][0] = 0;
367  sprite_delta[1][1] = a;
368  ctx->sprite_shift[0] = 0;
369  ctx->sprite_shift[1] = 0;
370  s->real_sprite_warping_points = 1;
371  } else {
372  int shift_y = 16 - ctx->sprite_shift[0];
373  int shift_c = 16 - ctx->sprite_shift[1];
374 
375  for (i = 0; i < 2; i++) {
376  if (shift_c < 0 || shift_y < 0 ||
377  FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
378  FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
379  FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
380  FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
381  ) {
382  avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
383  goto overflow;
384  }
385  }
386 
387  for (i = 0; i < 2; i++) {
388  sprite_offset[0][i] *= 1 << shift_y;
389  sprite_offset[1][i] *= 1 << shift_c;
390  sprite_delta[0][i] *= 1 << shift_y;
391  sprite_delta[1][i] *= 1 << shift_y;
392  ctx->sprite_shift[i] = 16;
393 
394  }
395  for (i = 0; i < 2; i++) {
396  int64_t sd[2] = {
397  sprite_delta[i][0] - a * (1LL<<16),
398  sprite_delta[i][1] - a * (1LL<<16)
399  };
400 
401  if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
402  llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
403  llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
404  llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
405  llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
406  llabs(sd[0]) >= INT_MAX ||
407  llabs(sd[1]) >= INT_MAX ||
408  llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
409  llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
410  llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
411  ) {
412  avpriv_request_sample(s->avctx, "Overflow on sprite points");
413  goto overflow;
414  }
415  }
416  s->real_sprite_warping_points = ctx->num_sprite_warping_points;
417  }
418 
419  for (i = 0; i < 4; i++) {
420  s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
421  s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
422  }
423 
424  return 0;
425 overflow:
426  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
427  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
428  return AVERROR_PATCHWELCOME;
429 }
430 
431 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
432  MpegEncContext *s = &ctx->m;
433  int len = FFMIN(ctx->time_increment_bits + 3, 15);
434 
435  get_bits(gb, len);
436  if (get_bits1(gb))
437  get_bits(gb, len);
438  check_marker(s->avctx, gb, "after new_pred");
439 
440  return 0;
441 }
442 
443 /**
444  * Decode the next video packet.
445  * @return <0 if something went wrong
446  */
447 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
448 {
449  MpegEncContext *s = &ctx->m;
450 
451  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
452  int header_extension = 0, mb_num, len;
453 
454  /* is there enough space left for a video packet + header */
455  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
456  return AVERROR_INVALIDDATA;
457 
458  for (len = 0; len < 32; len++)
459  if (get_bits1(&s->gb))
460  break;
461 
462  if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
463  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
464  return AVERROR_INVALIDDATA;
465  }
466 
467  if (ctx->shape != RECT_SHAPE) {
468  header_extension = get_bits1(&s->gb);
469  // FIXME more stuff here
470  }
471 
472  mb_num = get_bits(&s->gb, mb_num_bits);
473  if (mb_num >= s->mb_num || !mb_num) {
474  av_log(s->avctx, AV_LOG_ERROR,
475  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
476  return AVERROR_INVALIDDATA;
477  }
478 
479  s->mb_x = mb_num % s->mb_width;
480  s->mb_y = mb_num / s->mb_width;
481 
482  if (ctx->shape != BIN_ONLY_SHAPE) {
483  int qscale = get_bits(&s->gb, s->quant_precision);
484  if (qscale)
485  s->chroma_qscale = s->qscale = qscale;
486  }
487 
488  if (ctx->shape == RECT_SHAPE)
489  header_extension = get_bits1(&s->gb);
490 
491  if (header_extension) {
492  int time_incr = 0;
493 
494  while (get_bits1(&s->gb) != 0)
495  time_incr++;
496 
497  check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
498  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
499  check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
500 
501  skip_bits(&s->gb, 2); /* vop coding type */
502  // FIXME not rect stuff here
503 
504  if (ctx->shape != BIN_ONLY_SHAPE) {
505  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
506  // FIXME don't just ignore everything
507  if (s->pict_type == AV_PICTURE_TYPE_S &&
508  ctx->vol_sprite_usage == GMC_SPRITE) {
509  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
510  return AVERROR_INVALIDDATA;
511  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
512  }
513 
514  // FIXME reduced res stuff here
515 
516  if (s->pict_type != AV_PICTURE_TYPE_I) {
517  int f_code = get_bits(&s->gb, 3); /* fcode_for */
518  if (f_code == 0)
519  av_log(s->avctx, AV_LOG_ERROR,
520  "Error, video packet header damaged (f_code=0)\n");
521  }
522  if (s->pict_type == AV_PICTURE_TYPE_B) {
523  int b_code = get_bits(&s->gb, 3);
524  if (b_code == 0)
525  av_log(s->avctx, AV_LOG_ERROR,
526  "Error, video packet header damaged (b_code=0)\n");
527  }
528  }
529  }
530  if (ctx->new_pred)
531  decode_new_pred(ctx, &s->gb);
532 
533  return 0;
534 }
535 
536 static void reset_studio_dc_predictors(MpegEncContext *s)
537 {
538  /* Reset DC Predictors */
539  s->last_dc[0] =
540  s->last_dc[1] =
541  s->last_dc[2] = 1 << (s->avctx->bits_per_raw_sample + s->dct_precision + s->intra_dc_precision - 1);
542 }
543 
544 /**
545  * Decode the next video packet.
546  * @return <0 if something went wrong
547  */
548 int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
549 {
550  MpegEncContext *s = &ctx->m;
551  GetBitContext *gb = &s->gb;
552  unsigned vlc_len;
553  uint16_t mb_num;
554 
555  if (get_bits_left(gb) >= 32 && get_bits_long(gb, 32) == SLICE_START_CODE) {
556  vlc_len = av_log2(s->mb_width * s->mb_height) + 1;
557  mb_num = get_bits(gb, vlc_len);
558 
559  if (mb_num >= s->mb_num)
560  return AVERROR_INVALIDDATA;
561 
562  s->mb_x = mb_num % s->mb_width;
563  s->mb_y = mb_num / s->mb_width;
564 
565  if (ctx->shape != BIN_ONLY_SHAPE)
566  s->qscale = mpeg_get_qscale(s);
567 
568  if (get_bits1(gb)) { /* slice_extension_flag */
569  skip_bits1(gb); /* intra_slice */
570  skip_bits1(gb); /* slice_VOP_id_enable */
571  skip_bits(gb, 6); /* slice_VOP_id */
572  while (get_bits1(gb)) /* extra_bit_slice */
573  skip_bits(gb, 8); /* extra_information_slice */
574  }
575 
576  reset_studio_dc_predictors(s);
577  }
578  else {
579  return AVERROR_INVALIDDATA;
580  }
581 
582  return 0;
583 }
584 
585 /**
586  * Get the average motion vector for a GMC MB.
587  * @param n either 0 for the x component or 1 for y
588  * @return the average MV for a GMC MB
589  */
590 static inline int get_amv(Mpeg4DecContext *ctx, int n)
591 {
592  MpegEncContext *s = &ctx->m;
593  int x, y, mb_v, sum, dx, dy, shift;
594  int len = 1 << (s->f_code + 4);
595  const int a = s->sprite_warping_accuracy;
596 
597  if (s->workaround_bugs & FF_BUG_AMV)
598  len >>= s->quarter_sample;
599 
600  if (s->real_sprite_warping_points == 1) {
601  if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
602  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
603  else
604  sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
605  } else {
606  dx = s->sprite_delta[n][0];
607  dy = s->sprite_delta[n][1];
608  shift = ctx->sprite_shift[0];
609  if (n)
610  dy -= 1 << (shift + a + 1);
611  else
612  dx -= 1 << (shift + a + 1);
613  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16U + dy * s->mb_y * 16U;
614 
615  sum = 0;
616  for (y = 0; y < 16; y++) {
617  int v;
618 
619  v = mb_v + dy * y;
620  // FIXME optimize
621  for (x = 0; x < 16; x++) {
622  sum += v >> shift;
623  v += dx;
624  }
625  }
626  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
627  }
628 
629  if (sum < -len)
630  sum = -len;
631  else if (sum >= len)
632  sum = len - 1;
633 
634  return sum;
635 }
636 
637 /**
638  * Decode the dc value.
639  * @param n block index (0-3 are luma, 4-5 are chroma)
640  * @param dir_ptr the prediction direction will be stored here
641  * @return the quantized dc
642  */
643 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
644 {
645  int level, code;
646 
647  if (n < 4)
648  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
649  else
650  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
651 
652  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
653  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
654  return AVERROR_INVALIDDATA;
655  }
656 
657  if (code == 0) {
658  level = 0;
659  } else {
660  if (IS_3IV1) {
661  if (code == 1)
662  level = 2 * get_bits1(&s->gb) - 1;
663  else {
664  if (get_bits1(&s->gb))
665  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
666  else
667  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
668  }
669  } else {
670  level = get_xbits(&s->gb, code);
671  }
672 
673  if (code > 8) {
674  if (get_bits1(&s->gb) == 0) { /* marker */
675  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
676  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
677  return AVERROR_INVALIDDATA;
678  }
679  }
680  }
681  }
682 
683  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
684 }
685 
686 /**
687  * Decode first partition.
688  * @return number of MBs decoded or <0 if an error occurred
689  */
690 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
691 {
692  MpegEncContext *s = &ctx->m;
693  int mb_num = 0;
694  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
695 
696  /* decode first partition */
697  s->first_slice_line = 1;
698  for (; s->mb_y < s->mb_height; s->mb_y++) {
699  ff_init_block_index(s);
700  for (; s->mb_x < s->mb_width; s->mb_x++) {
701  const int xy = s->mb_x + s->mb_y * s->mb_stride;
702  int cbpc;
703  int dir = 0;
704 
705  mb_num++;
706  ff_update_block_index(s);
707  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
708  s->first_slice_line = 0;
709 
710  if (s->pict_type == AV_PICTURE_TYPE_I) {
711  int i;
712 
713  do {
714  if (show_bits_long(&s->gb, 19) == DC_MARKER)
715  return mb_num - 1;
716 
717  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
718  if (cbpc < 0) {
719  av_log(s->avctx, AV_LOG_ERROR,
720  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
721  return AVERROR_INVALIDDATA;
722  }
723  } while (cbpc == 8);
724 
725  s->cbp_table[xy] = cbpc & 3;
726  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
727  s->mb_intra = 1;
728 
729  if (cbpc & 4)
730  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
731 
732  s->current_picture.qscale_table[xy] = s->qscale;
733 
734  s->mbintra_table[xy] = 1;
735  for (i = 0; i < 6; i++) {
736  int dc_pred_dir;
737  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
738  if (dc < 0) {
739  av_log(s->avctx, AV_LOG_ERROR,
740  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
741  return dc;
742  }
743  dir <<= 1;
744  if (dc_pred_dir)
745  dir |= 1;
746  }
747  s->pred_dir_table[xy] = dir;
748  } else { /* P/S_TYPE */
749  int mx, my, pred_x, pred_y, bits;
750  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
751  const int stride = s->b8_stride * 2;
752 
753 try_again:
754  bits = show_bits(&s->gb, 17);
755  if (bits == MOTION_MARKER)
756  return mb_num - 1;
757 
758  skip_bits1(&s->gb);
759  if (bits & 0x10000) {
760  /* skip mb */
761  if (s->pict_type == AV_PICTURE_TYPE_S &&
762  ctx->vol_sprite_usage == GMC_SPRITE) {
763  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
764  MB_TYPE_16x16 |
765  MB_TYPE_GMC |
766  MB_TYPE_L0;
767  mx = get_amv(ctx, 0);
768  my = get_amv(ctx, 1);
769  } else {
770  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
771  MB_TYPE_16x16 |
772  MB_TYPE_L0;
773  mx = my = 0;
774  }
775  mot_val[0] =
776  mot_val[2] =
777  mot_val[0 + stride] =
778  mot_val[2 + stride] = mx;
779  mot_val[1] =
780  mot_val[3] =
781  mot_val[1 + stride] =
782  mot_val[3 + stride] = my;
783 
784  if (s->mbintra_table[xy])
785  ff_clean_intra_table_entries(s);
786  continue;
787  }
788 
789  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
790  if (cbpc < 0) {
791  av_log(s->avctx, AV_LOG_ERROR,
792  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
793  return AVERROR_INVALIDDATA;
794  }
795  if (cbpc == 20)
796  goto try_again;
797 
798  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
799 
800  s->mb_intra = ((cbpc & 4) != 0);
801 
802  if (s->mb_intra) {
803  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
804  s->mbintra_table[xy] = 1;
805  mot_val[0] =
806  mot_val[2] =
807  mot_val[0 + stride] =
808  mot_val[2 + stride] = 0;
809  mot_val[1] =
810  mot_val[3] =
811  mot_val[1 + stride] =
812  mot_val[3 + stride] = 0;
813  } else {
814  if (s->mbintra_table[xy])
815  ff_clean_intra_table_entries(s);
816 
817  if (s->pict_type == AV_PICTURE_TYPE_S &&
818  ctx->vol_sprite_usage == GMC_SPRITE &&
819  (cbpc & 16) == 0)
820  s->mcsel = get_bits1(&s->gb);
821  else
822  s->mcsel = 0;
823 
824  if ((cbpc & 16) == 0) {
825  /* 16x16 motion prediction */
826 
827  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
828  if (!s->mcsel) {
829  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
830  if (mx >= 0xffff)
831  return AVERROR_INVALIDDATA;
832 
833  my = ff_h263_decode_motion(s, pred_y, s->f_code);
834  if (my >= 0xffff)
835  return AVERROR_INVALIDDATA;
836  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
837  MB_TYPE_L0;
838  } else {
839  mx = get_amv(ctx, 0);
840  my = get_amv(ctx, 1);
841  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
842  MB_TYPE_GMC |
843  MB_TYPE_L0;
844  }
845 
846  mot_val[0] =
847  mot_val[2] =
848  mot_val[0 + stride] =
849  mot_val[2 + stride] = mx;
850  mot_val[1] =
851  mot_val[3] =
852  mot_val[1 + stride] =
853  mot_val[3 + stride] = my;
854  } else {
855  int i;
856  s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
857  MB_TYPE_L0;
858  for (i = 0; i < 4; i++) {
859  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
860  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
861  if (mx >= 0xffff)
862  return AVERROR_INVALIDDATA;
863 
864  my = ff_h263_decode_motion(s, pred_y, s->f_code);
865  if (my >= 0xffff)
866  return AVERROR_INVALIDDATA;
867  mot_val[0] = mx;
868  mot_val[1] = my;
869  }
870  }
871  }
872  }
873  }
874  s->mb_x = 0;
875  }
876 
877  return mb_num;
878 }
879 
880 /**
881  * decode second partition.
882  * @return <0 if an error occurred
883  */
884 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
885 {
886  int mb_num = 0;
887  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
888 
889  s->mb_x = s->resync_mb_x;
890  s->first_slice_line = 1;
891  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
892  ff_init_block_index(s);
893  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
894  const int xy = s->mb_x + s->mb_y * s->mb_stride;
895 
896  mb_num++;
897  ff_update_block_index(s);
898  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
899  s->first_slice_line = 0;
900 
901  if (s->pict_type == AV_PICTURE_TYPE_I) {
902  int ac_pred = get_bits1(&s->gb);
903  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
904  if (cbpy < 0) {
905  av_log(s->avctx, AV_LOG_ERROR,
906  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
907  return AVERROR_INVALIDDATA;
908  }
909 
910  s->cbp_table[xy] |= cbpy << 2;
911  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
912  } else { /* P || S_TYPE */
913  if (IS_INTRA(s->current_picture.mb_type[xy])) {
914  int i;
915  int dir = 0;
916  int ac_pred = get_bits1(&s->gb);
917  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
918 
919  if (cbpy < 0) {
920  av_log(s->avctx, AV_LOG_ERROR,
921  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
922  return AVERROR_INVALIDDATA;
923  }
924 
925  if (s->cbp_table[xy] & 8)
926  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
927  s->current_picture.qscale_table[xy] = s->qscale;
928 
929  for (i = 0; i < 6; i++) {
930  int dc_pred_dir;
931  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
932  if (dc < 0) {
933  av_log(s->avctx, AV_LOG_ERROR,
934  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
935  return dc;
936  }
937  dir <<= 1;
938  if (dc_pred_dir)
939  dir |= 1;
940  }
941  s->cbp_table[xy] &= 3; // remove dquant
942  s->cbp_table[xy] |= cbpy << 2;
943  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
944  s->pred_dir_table[xy] = dir;
945  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
946  s->current_picture.qscale_table[xy] = s->qscale;
947  s->cbp_table[xy] = 0;
948  } else {
949  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
950 
951  if (cbpy < 0) {
952  av_log(s->avctx, AV_LOG_ERROR,
953  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
954  return AVERROR_INVALIDDATA;
955  }
956 
957  if (s->cbp_table[xy] & 8)
958  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
959  s->current_picture.qscale_table[xy] = s->qscale;
960 
961  s->cbp_table[xy] &= 3; // remove dquant
962  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
963  }
964  }
965  }
966  if (mb_num >= mb_count)
967  return 0;
968  s->mb_x = 0;
969  }
970  return 0;
971 }
972 
973 /**
974  * Decode the first and second partition.
975  * @return <0 if error (and sets error type in the error_status_table)
976  */
977 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
978 {
979  MpegEncContext *s = &ctx->m;
980  int mb_num;
981  int ret;
982  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
983  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
984 
985  mb_num = mpeg4_decode_partition_a(ctx);
986  if (mb_num <= 0) {
987  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
988  s->mb_x, s->mb_y, part_a_error);
989  return mb_num ? mb_num : AVERROR_INVALIDDATA;
990  }
991 
992  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
993  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
994  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
995  s->mb_x, s->mb_y, part_a_error);
996  return AVERROR_INVALIDDATA;
997  }
998 
999  s->mb_num_left = mb_num;
1000 
1001  if (s->pict_type == AV_PICTURE_TYPE_I) {
1002  while (show_bits(&s->gb, 9) == 1)
1003  skip_bits(&s->gb, 9);
1004  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
1005  av_log(s->avctx, AV_LOG_ERROR,
1006  "marker missing after first I partition at %d %d\n",
1007  s->mb_x, s->mb_y);
1008  return AVERROR_INVALIDDATA;
1009  }
1010  } else {
1011  while (show_bits(&s->gb, 10) == 1)
1012  skip_bits(&s->gb, 10);
1013  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
1014  av_log(s->avctx, AV_LOG_ERROR,
1015  "marker missing after first P partition at %d %d\n",
1016  s->mb_x, s->mb_y);
1017  return AVERROR_INVALIDDATA;
1018  }
1019  }
1020  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1021  s->mb_x - 1, s->mb_y, part_a_end);
1022 
1023  ret = mpeg4_decode_partition_b(s, mb_num);
1024  if (ret < 0) {
1025  if (s->pict_type == AV_PICTURE_TYPE_P)
1026  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1027  s->mb_x, s->mb_y, ER_DC_ERROR);
1028  return ret;
1029  } else {
1030  if (s->pict_type == AV_PICTURE_TYPE_P)
1031  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1032  s->mb_x - 1, s->mb_y, ER_DC_END);
1033  }
1034 
1035  return 0;
1036 }
1037 
1038 /**
1039  * Decode a block.
1040  * @return <0 if an error occurred
1041  */
1042 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
1043  int n, int coded, int intra, int rvlc)
1044 {
1045  MpegEncContext *s = &ctx->m;
1046  int level, i, last, run, qmul, qadd;
1047  int av_uninit(dc_pred_dir);
1048  RLTable *rl;
1049  RL_VLC_ELEM *rl_vlc;
1050  const uint8_t *scan_table;
1051 
1052  // Note intra & rvlc should be optimized away if this is inlined
1053 
1054  if (intra) {
1055  if (ctx->use_intra_dc_vlc) {
1056  /* DC coef */
1057  if (s->partitioned_frame) {
1058  level = s->dc_val[0][s->block_index[n]];
1059  if (n < 4)
1060  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1061  else
1062  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1063  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1064  } else {
1065  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1066  if (level < 0)
1067  return level;
1068  }
1069  block[0] = level;
1070  i = 0;
1071  } else {
1072  i = -1;
1073  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1074  }
1075  if (!coded)
1076  goto not_coded;
1077 
1078  if (rvlc) {
1079  rl = &ff_rvlc_rl_intra;
1080  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1081  } else {
1082  rl = &ff_mpeg4_rl_intra;
1083  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1084  }
1085  if (s->ac_pred) {
1086  if (dc_pred_dir == 0)
1087  scan_table = s->intra_v_scantable.permutated; /* left */
1088  else
1089  scan_table = s->intra_h_scantable.permutated; /* top */
1090  } else {
1091  scan_table = s->intra_scantable.permutated;
1092  }
1093  qmul = 1;
1094  qadd = 0;
1095  } else {
1096  i = -1;
1097  if (!coded) {
1098  s->block_last_index[n] = i;
1099  return 0;
1100  }
1101  if (rvlc)
1102  rl = &ff_rvlc_rl_inter;
1103  else
1104  rl = &ff_h263_rl_inter;
1105 
1106  scan_table = s->intra_scantable.permutated;
1107 
1108  if (s->mpeg_quant) {
1109  qmul = 1;
1110  qadd = 0;
1111  if (rvlc)
1112  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1113  else
1114  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1115  } else {
1116  qmul = s->qscale << 1;
1117  qadd = (s->qscale - 1) | 1;
1118  if (rvlc)
1119  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1120  else
1121  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1122  }
1123  }
1124  {
1125  OPEN_READER(re, &s->gb);
1126  for (;;) {
1127  UPDATE_CACHE(re, &s->gb);
1128  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1129  if (level == 0) {
1130  /* escape */
1131  if (rvlc) {
1132  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1133  av_log(s->avctx, AV_LOG_ERROR,
1134  "1. marker bit missing in rvlc esc\n");
1135  return AVERROR_INVALIDDATA;
1136  }
1137  SKIP_CACHE(re, &s->gb, 1);
1138 
1139  last = SHOW_UBITS(re, &s->gb, 1);
1140  SKIP_CACHE(re, &s->gb, 1);
1141  run = SHOW_UBITS(re, &s->gb, 6);
1142  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1143  UPDATE_CACHE(re, &s->gb);
1144 
1145  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1146  av_log(s->avctx, AV_LOG_ERROR,
1147  "2. marker bit missing in rvlc esc\n");
1148  return AVERROR_INVALIDDATA;
1149  }
1150  SKIP_CACHE(re, &s->gb, 1);
1151 
1152  level = SHOW_UBITS(re, &s->gb, 11);
1153  SKIP_CACHE(re, &s->gb, 11);
1154 
1155  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1156  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1157  return AVERROR_INVALIDDATA;
1158  }
1159  SKIP_CACHE(re, &s->gb, 5);
1160 
1161  level = level * qmul + qadd;
1162  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1163  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1164 
1165  i += run + 1;
1166  if (last)
1167  i += 192;
1168  } else {
1169  int cache;
1170  cache = GET_CACHE(re, &s->gb);
1171 
1172  if (IS_3IV1)
1173  cache ^= 0xC0000000;
1174 
1175  if (cache & 0x80000000) {
1176  if (cache & 0x40000000) {
1177  /* third escape */
1178  SKIP_CACHE(re, &s->gb, 2);
1179  last = SHOW_UBITS(re, &s->gb, 1);
1180  SKIP_CACHE(re, &s->gb, 1);
1181  run = SHOW_UBITS(re, &s->gb, 6);
1182  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1183  UPDATE_CACHE(re, &s->gb);
1184 
1185  if (IS_3IV1) {
1186  level = SHOW_SBITS(re, &s->gb, 12);
1187  LAST_SKIP_BITS(re, &s->gb, 12);
1188  } else {
1189  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1190  av_log(s->avctx, AV_LOG_ERROR,
1191  "1. marker bit missing in 3. esc\n");
1192  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1193  return AVERROR_INVALIDDATA;
1194  }
1195  SKIP_CACHE(re, &s->gb, 1);
1196 
1197  level = SHOW_SBITS(re, &s->gb, 12);
1198  SKIP_CACHE(re, &s->gb, 12);
1199 
1200  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1201  av_log(s->avctx, AV_LOG_ERROR,
1202  "2. marker bit missing in 3. esc\n");
1203  if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1204  return AVERROR_INVALIDDATA;
1205  }
1206 
1207  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1208  }
1209 
1210 #if 0
1211  if (s->error_recognition >= FF_ER_COMPLIANT) {
1212  const int abs_level= FFABS(level);
1213  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1214  const int run1= run - rl->max_run[last][abs_level] - 1;
1215  if (abs_level <= rl->max_level[last][run]) {
1216  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1217  return AVERROR_INVALIDDATA;
1218  }
1219  if (s->error_recognition > FF_ER_COMPLIANT) {
1220  if (abs_level <= rl->max_level[last][run]*2) {
1221  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1222  return AVERROR_INVALIDDATA;
1223  }
1224  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1225  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1226  return AVERROR_INVALIDDATA;
1227  }
1228  }
1229  }
1230  }
1231 #endif
1232  if (level > 0)
1233  level = level * qmul + qadd;
1234  else
1235  level = level * qmul - qadd;
1236 
1237  if ((unsigned)(level + 2048) > 4095) {
1238  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1239  if (level > 2560 || level < -2560) {
1240  av_log(s->avctx, AV_LOG_ERROR,
1241  "|level| overflow in 3. esc, qp=%d\n",
1242  s->qscale);
1243  return AVERROR_INVALIDDATA;
1244  }
1245  }
1246  level = level < 0 ? -2048 : 2047;
1247  }
1248 
1249  i += run + 1;
1250  if (last)
1251  i += 192;
1252  } else {
1253  /* second escape */
1254  SKIP_BITS(re, &s->gb, 2);
1255  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1256  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1257  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1258  LAST_SKIP_BITS(re, &s->gb, 1);
1259  }
1260  } else {
1261  /* first escape */
1262  SKIP_BITS(re, &s->gb, 1);
1263  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1264  i += run;
1265  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1266  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1267  LAST_SKIP_BITS(re, &s->gb, 1);
1268  }
1269  }
1270  } else {
1271  i += run;
1272  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1273  LAST_SKIP_BITS(re, &s->gb, 1);
1274  }
1275  ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1276  if (i > 62) {
1277  i -= 192;
1278  if (i & (~63)) {
1279  av_log(s->avctx, AV_LOG_ERROR,
1280  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1281  return AVERROR_INVALIDDATA;
1282  }
1283 
1284  block[scan_table[i]] = level;
1285  break;
1286  }
1287 
1288  block[scan_table[i]] = level;
1289  }
1290  CLOSE_READER(re, &s->gb);
1291  }
1292 
1293 not_coded:
1294  if (intra) {
1295  if (!ctx->use_intra_dc_vlc) {
1296  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1297 
1298  i -= i >> 31; // if (i == -1) i = 0;
1299  }
1300 
1301  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1302  if (s->ac_pred)
1303  i = 63; // FIXME not optimal
1304  }
1305  s->block_last_index[n] = i;
1306  return 0;
1307 }
1308 
1309 /**
1310  * decode partition C of one MB.
1311  * @return <0 if an error occurred
1312  */
1313 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1314 {
1315  Mpeg4DecContext *ctx = s->avctx->priv_data;
1316  int cbp, mb_type;
1317  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1318 
1319  av_assert2(s == (void*)ctx);
1320 
1321  mb_type = s->current_picture.mb_type[xy];
1322  cbp = s->cbp_table[xy];
1323 
1324  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1325 
1326  if (s->current_picture.qscale_table[xy] != s->qscale)
1327  ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1328 
1329  if (s->pict_type == AV_PICTURE_TYPE_P ||
1330  s->pict_type == AV_PICTURE_TYPE_S) {
1331  int i;
1332  for (i = 0; i < 4; i++) {
1333  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1334  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1335  }
1336  s->mb_intra = IS_INTRA(mb_type);
1337 
1338  if (IS_SKIP(mb_type)) {
1339  /* skip mb */
1340  for (i = 0; i < 6; i++)
1341  s->block_last_index[i] = -1;
1342  s->mv_dir = MV_DIR_FORWARD;
1343  s->mv_type = MV_TYPE_16X16;
1344  if (s->pict_type == AV_PICTURE_TYPE_S
1345  && ctx->vol_sprite_usage == GMC_SPRITE) {
1346  s->mcsel = 1;
1347  s->mb_skipped = 0;
1348  } else {
1349  s->mcsel = 0;
1350  s->mb_skipped = 1;
1351  }
1352  } else if (s->mb_intra) {
1353  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1354  } else if (!s->mb_intra) {
1355  // s->mcsel = 0; // FIXME do we need to init that?
1356 
1357  s->mv_dir = MV_DIR_FORWARD;
1358  if (IS_8X8(mb_type)) {
1359  s->mv_type = MV_TYPE_8X8;
1360  } else {
1361  s->mv_type = MV_TYPE_16X16;
1362  }
1363  }
1364  } else { /* I-Frame */
1365  s->mb_intra = 1;
1366  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1367  }
1368 
1369  if (!IS_SKIP(mb_type)) {
1370  int i;
1371  s->bdsp.clear_blocks(s->block[0]);
1372  /* decode each block */
1373  for (i = 0; i < 6; i++) {
1374  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1375  av_log(s->avctx, AV_LOG_ERROR,
1376  "texture corrupted at %d %d %d\n",
1377  s->mb_x, s->mb_y, s->mb_intra);
1378  return AVERROR_INVALIDDATA;
1379  }
1380  cbp += cbp;
1381  }
1382  }
1383 
1384  /* per-MB end of slice check */
1385  if (--s->mb_num_left <= 0) {
1386  if (mpeg4_is_resync(ctx))
1387  return SLICE_END;
1388  else
1389  return SLICE_NOEND;
1390  } else {
1391  if (mpeg4_is_resync(ctx)) {
1392  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1393  if (s->cbp_table[xy + delta])
1394  return SLICE_END;
1395  }
1396  return SLICE_OK;
1397  }
1398 }
1399 
1400 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1401 {
1402  Mpeg4DecContext *ctx = s->avctx->priv_data;
1403  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1404  int16_t *mot_val;
1405  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1406  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1407 
1408  av_assert2(s == (void*)ctx);
1409  av_assert2(s->h263_pred);
1410 
1411  if (s->pict_type == AV_PICTURE_TYPE_P ||
1412  s->pict_type == AV_PICTURE_TYPE_S) {
1413  do {
1414  if (get_bits1(&s->gb)) {
1415  /* skip mb */
1416  s->mb_intra = 0;
1417  for (i = 0; i < 6; i++)
1418  s->block_last_index[i] = -1;
1419  s->mv_dir = MV_DIR_FORWARD;
1420  s->mv_type = MV_TYPE_16X16;
1421  if (s->pict_type == AV_PICTURE_TYPE_S &&
1422  ctx->vol_sprite_usage == GMC_SPRITE) {
1423  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1424  MB_TYPE_GMC |
1425  MB_TYPE_16x16 |
1426  MB_TYPE_L0;
1427  s->mcsel = 1;
1428  s->mv[0][0][0] = get_amv(ctx, 0);
1429  s->mv[0][0][1] = get_amv(ctx, 1);
1430  s->mb_skipped = 0;
1431  } else {
1432  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1433  MB_TYPE_16x16 |
1434  MB_TYPE_L0;
1435  s->mcsel = 0;
1436  s->mv[0][0][0] = 0;
1437  s->mv[0][0][1] = 0;
1438  s->mb_skipped = 1;
1439  }
1440  goto end;
1441  }
1442  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1443  if (cbpc < 0) {
1444  av_log(s->avctx, AV_LOG_ERROR,
1445  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1446  return AVERROR_INVALIDDATA;
1447  }
1448  } while (cbpc == 20);
1449 
1450  s->bdsp.clear_blocks(s->block[0]);
1451  dquant = cbpc & 8;
1452  s->mb_intra = ((cbpc & 4) != 0);
1453  if (s->mb_intra)
1454  goto intra;
1455 
1456  if (s->pict_type == AV_PICTURE_TYPE_S &&
1457  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1458  s->mcsel = get_bits1(&s->gb);
1459  else
1460  s->mcsel = 0;
1461  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1462  if (cbpy < 0) {
1463  av_log(s->avctx, AV_LOG_ERROR,
1464  "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1465  return AVERROR_INVALIDDATA;
1466  }
1467 
1468  cbp = (cbpc & 3) | (cbpy << 2);
1469  if (dquant)
1470  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1471  if ((!s->progressive_sequence) &&
1472  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1473  s->interlaced_dct = get_bits1(&s->gb);
1474 
1475  s->mv_dir = MV_DIR_FORWARD;
1476  if ((cbpc & 16) == 0) {
1477  if (s->mcsel) {
1478  s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1479  MB_TYPE_16x16 |
1480  MB_TYPE_L0;
1481  /* 16x16 global motion prediction */
1482  s->mv_type = MV_TYPE_16X16;
1483  mx = get_amv(ctx, 0);
1484  my = get_amv(ctx, 1);
1485  s->mv[0][0][0] = mx;
1486  s->mv[0][0][1] = my;
1487  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1488  s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1489  MB_TYPE_L0 |
1490  MB_TYPE_INTERLACED;
1491  /* 16x8 field motion prediction */
1492  s->mv_type = MV_TYPE_FIELD;
1493 
1494  s->field_select[0][0] = get_bits1(&s->gb);
1495  s->field_select[0][1] = get_bits1(&s->gb);
1496 
1497  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1498 
1499  for (i = 0; i < 2; i++) {
1500  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1501  if (mx >= 0xffff)
1502  return AVERROR_INVALIDDATA;
1503 
1504  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1505  if (my >= 0xffff)
1506  return AVERROR_INVALIDDATA;
1507 
1508  s->mv[0][i][0] = mx;
1509  s->mv[0][i][1] = my;
1510  }
1511  } else {
1512  s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1513  /* 16x16 motion prediction */
1514  s->mv_type = MV_TYPE_16X16;
1515  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1516  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1517 
1518  if (mx >= 0xffff)
1519  return AVERROR_INVALIDDATA;
1520 
1521  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1522 
1523  if (my >= 0xffff)
1524  return AVERROR_INVALIDDATA;
1525  s->mv[0][0][0] = mx;
1526  s->mv[0][0][1] = my;
1527  }
1528  } else {
1529  s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1530  s->mv_type = MV_TYPE_8X8;
1531  for (i = 0; i < 4; i++) {
1532  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1533  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1534  if (mx >= 0xffff)
1535  return AVERROR_INVALIDDATA;
1536 
1537  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1538  if (my >= 0xffff)
1539  return AVERROR_INVALIDDATA;
1540  s->mv[0][i][0] = mx;
1541  s->mv[0][i][1] = my;
1542  mot_val[0] = mx;
1543  mot_val[1] = my;
1544  }
1545  }
1546  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1547  int modb1; // first bit of modb
1548  int modb2; // second bit of modb
1549  int mb_type;
1550 
1551  s->mb_intra = 0; // B-frames never contain intra blocks
1552  s->mcsel = 0; // ... true gmc blocks
1553 
1554  if (s->mb_x == 0) {
1555  for (i = 0; i < 2; i++) {
1556  s->last_mv[i][0][0] =
1557  s->last_mv[i][0][1] =
1558  s->last_mv[i][1][0] =
1559  s->last_mv[i][1][1] = 0;
1560  }
1561 
1562  ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1563  }
1564 
1565  /* if we skipped it in the future P-frame than skip it now too */
1566  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1567 
1568  if (s->mb_skipped) {
1569  /* skip mb */
1570  for (i = 0; i < 6; i++)
1571  s->block_last_index[i] = -1;
1572 
1573  s->mv_dir = MV_DIR_FORWARD;
1574  s->mv_type = MV_TYPE_16X16;
1575  s->mv[0][0][0] =
1576  s->mv[0][0][1] =
1577  s->mv[1][0][0] =
1578  s->mv[1][0][1] = 0;
1579  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1580  MB_TYPE_16x16 |
1581  MB_TYPE_L0;
1582  goto end;
1583  }
1584 
1585  modb1 = get_bits1(&s->gb);
1586  if (modb1) {
1587  // like MB_TYPE_B_DIRECT but no vectors coded
1588  mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1589  cbp = 0;
1590  } else {
1591  modb2 = get_bits1(&s->gb);
1592  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1593  if (mb_type < 0) {
1594  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1595  return AVERROR_INVALIDDATA;
1596  }
1597  mb_type = mb_type_b_map[mb_type];
1598  if (modb2) {
1599  cbp = 0;
1600  } else {
1601  s->bdsp.clear_blocks(s->block[0]);
1602  cbp = get_bits(&s->gb, 6);
1603  }
1604 
1605  if ((!IS_DIRECT(mb_type)) && cbp) {
1606  if (get_bits1(&s->gb))
1607  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1608  }
1609 
1610  if (!s->progressive_sequence) {
1611  if (cbp)
1612  s->interlaced_dct = get_bits1(&s->gb);
1613 
1614  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1615  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1616  mb_type &= ~MB_TYPE_16x16;
1617 
1618  if (USES_LIST(mb_type, 0)) {
1619  s->field_select[0][0] = get_bits1(&s->gb);
1620  s->field_select[0][1] = get_bits1(&s->gb);
1621  }
1622  if (USES_LIST(mb_type, 1)) {
1623  s->field_select[1][0] = get_bits1(&s->gb);
1624  s->field_select[1][1] = get_bits1(&s->gb);
1625  }
1626  }
1627  }
1628 
1629  s->mv_dir = 0;
1630  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1631  s->mv_type = MV_TYPE_16X16;
1632 
1633  if (USES_LIST(mb_type, 0)) {
1634  s->mv_dir = MV_DIR_FORWARD;
1635 
1636  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1637  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1638  s->last_mv[0][1][0] =
1639  s->last_mv[0][0][0] =
1640  s->mv[0][0][0] = mx;
1641  s->last_mv[0][1][1] =
1642  s->last_mv[0][0][1] =
1643  s->mv[0][0][1] = my;
1644  }
1645 
1646  if (USES_LIST(mb_type, 1)) {
1647  s->mv_dir |= MV_DIR_BACKWARD;
1648 
1649  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1650  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1651  s->last_mv[1][1][0] =
1652  s->last_mv[1][0][0] =
1653  s->mv[1][0][0] = mx;
1654  s->last_mv[1][1][1] =
1655  s->last_mv[1][0][1] =
1656  s->mv[1][0][1] = my;
1657  }
1658  } else if (!IS_DIRECT(mb_type)) {
1659  s->mv_type = MV_TYPE_FIELD;
1660 
1661  if (USES_LIST(mb_type, 0)) {
1662  s->mv_dir = MV_DIR_FORWARD;
1663 
1664  for (i = 0; i < 2; i++) {
1665  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1666  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1667  s->last_mv[0][i][0] =
1668  s->mv[0][i][0] = mx;
1669  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1670  }
1671  }
1672 
1673  if (USES_LIST(mb_type, 1)) {
1674  s->mv_dir |= MV_DIR_BACKWARD;
1675 
1676  for (i = 0; i < 2; i++) {
1677  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1678  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1679  s->last_mv[1][i][0] =
1680  s->mv[1][i][0] = mx;
1681  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1682  }
1683  }
1684  }
1685  }
1686 
1687  if (IS_DIRECT(mb_type)) {
1688  if (IS_SKIP(mb_type)) {
1689  mx =
1690  my = 0;
1691  } else {
1692  mx = ff_h263_decode_motion(s, 0, 1);
1693  my = ff_h263_decode_motion(s, 0, 1);
1694  }
1695 
1696  s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1697  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1698  }
1699  s->current_picture.mb_type[xy] = mb_type;
1700  } else { /* I-Frame */
1701  do {
1702  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1703  if (cbpc < 0) {
1704  av_log(s->avctx, AV_LOG_ERROR,
1705  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1706  return AVERROR_INVALIDDATA;
1707  }
1708  } while (cbpc == 8);
1709 
1710  dquant = cbpc & 4;
1711  s->mb_intra = 1;
1712 
1713 intra:
1714  s->ac_pred = get_bits1(&s->gb);
1715  if (s->ac_pred)
1716  s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1717  else
1718  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1719 
1720  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1721  if (cbpy < 0) {
1722  av_log(s->avctx, AV_LOG_ERROR,
1723  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1724  return AVERROR_INVALIDDATA;
1725  }
1726  cbp = (cbpc & 3) | (cbpy << 2);
1727 
1728  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1729 
1730  if (dquant)
1731  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1732 
1733  if (!s->progressive_sequence)
1734  s->interlaced_dct = get_bits1(&s->gb);
1735 
1736  s->bdsp.clear_blocks(s->block[0]);
1737  /* decode each block */
1738  for (i = 0; i < 6; i++) {
1739  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1740  return AVERROR_INVALIDDATA;
1741  cbp += cbp;
1742  }
1743  goto end;
1744  }
1745 
1746  /* decode each block */
1747  for (i = 0; i < 6; i++) {
1748  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1749  return AVERROR_INVALIDDATA;
1750  cbp += cbp;
1751  }
1752 
1753 end:
1754  /* per-MB end of slice check */
1755  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1756  int next = mpeg4_is_resync(ctx);
1757  if (next) {
1758  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1759  return AVERROR_INVALIDDATA;
1760  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1761  return SLICE_END;
1762 
1763  if (s->pict_type == AV_PICTURE_TYPE_B) {
1764  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1765  ff_thread_await_progress(&s->next_picture_ptr->tf,
1766  (s->mb_x + delta >= s->mb_width)
1767  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1768  : s->mb_y, 0);
1769  if (s->next_picture.mbskip_table[xy + delta])
1770  return SLICE_OK;
1771  }
1772 
1773  return SLICE_END;
1774  }
1775  }
1776 
1777  return SLICE_OK;
1778 }
1779 
1780 /* As per spec, studio start code search isn't the same as the old type of start code */
1781 static void next_start_code_studio(GetBitContext *gb)
1782 {
1783  align_get_bits(gb);
1784 
1785  while (get_bits_left(gb) >= 24 && show_bits_long(gb, 24) != 0x1) {
1786  get_bits(gb, 8);
1787  }
1788 }
1789 
1790 /* additional_code, vlc index */
1791 static const uint8_t ac_state_tab[22][2] =
1792 {
1793  {0, 0},
1794  {0, 1},
1795  {1, 1},
1796  {2, 1},
1797  {3, 1},
1798  {4, 1},
1799  {5, 1},
1800  {1, 2},
1801  {2, 2},
1802  {3, 2},
1803  {4, 2},
1804  {5, 2},
1805  {6, 2},
1806  {1, 3},
1807  {2, 4},
1808  {3, 5},
1809  {4, 6},
1810  {5, 7},
1811  {6, 8},
1812  {7, 9},
1813  {8, 10},
1814  {0, 11}
1815 };
1816 
1817 static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n)
1818 {
1819  Mpeg4DecContext *ctx = s->avctx->priv_data;
1820 
1821  int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
1822  additional_code_len, sign, mismatch;
1823  VLC *cur_vlc = &ctx->studio_intra_tab[0];
1824  uint8_t *const scantable = s->intra_scantable.permutated;
1825  const uint16_t *quant_matrix;
1826  uint32_t flc;
1827  const int min = -1 * (1 << (s->avctx->bits_per_raw_sample + 6));
1828  const int max = ((1 << (s->avctx->bits_per_raw_sample + 6)) - 1);
1829  int shift = 3 - s->dct_precision;
1830 
1831  mismatch = 1;
1832 
1833  memset(block, 0, 64 * sizeof(int32_t));
1834 
1835  if (n < 4) {
1836  cc = 0;
1837  dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1838  quant_matrix = s->intra_matrix;
1839  } else {
1840  cc = (n & 1) + 1;
1841  if (ctx->rgb)
1842  dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1843  else
1844  dct_dc_size = get_vlc2(&s->gb, ctx->studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
1845  quant_matrix = s->chroma_intra_matrix;
1846  }
1847 
1848  if (dct_dc_size < 0) {
1849  av_log(s->avctx, AV_LOG_ERROR, "illegal dct_dc_size vlc\n");
1850  return AVERROR_INVALIDDATA;
1851  } else if (dct_dc_size == 0) {
1852  dct_diff = 0;
1853  } else {
1854  dct_diff = get_xbits(&s->gb, dct_dc_size);
1855 
1856  if (dct_dc_size > 8) {
1857  if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
1858  return AVERROR_INVALIDDATA;
1859  }
1860 
1861  }
1862 
1863  s->last_dc[cc] += dct_diff;
1864 
1865  if (s->mpeg_quant)
1866  block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
1867  else
1868  block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
1869  /* TODO: support mpeg_quant for AC coefficients */
1870 
1871  block[0] = av_clip(block[0], min, max);
1872  mismatch ^= block[0];
1873 
1874  /* AC Coefficients */
1875  while (1) {
1876  group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);
1877 
1878  if (group < 0) {
1879  av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
1880  return AVERROR_INVALIDDATA;
1881  }
1882 
1883  additional_code_len = ac_state_tab[group][0];
1884  cur_vlc = &ctx->studio_intra_tab[ac_state_tab[group][1]];
1885 
1886  if (group == 0) {
1887  /* End of Block */
1888  break;
1889  } else if (group >= 1 && group <= 6) {
1890  /* Zero run length (Table B.47) */
1891  run = 1 << additional_code_len;
1892  if (additional_code_len)
1893  run += get_bits(&s->gb, additional_code_len);
1894  idx += run;
1895  continue;
1896  } else if (group >= 7 && group <= 12) {
1897  /* Zero run length and +/-1 level (Table B.48) */
1898  code = get_bits(&s->gb, additional_code_len);
1899  sign = code & 1;
1900  code >>= 1;
1901  run = (1 << (additional_code_len - 1)) + code;
1902  idx += run;
1903  if (idx > 63)
1904  return AVERROR_INVALIDDATA;
1905  j = scantable[idx++];
1906  block[j] = sign ? 1 : -1;
1907  } else if (group >= 13 && group <= 20) {
1908  /* Level value (Table B.49) */
1909  if (idx > 63)
1910  return AVERROR_INVALIDDATA;
1911  j = scantable[idx++];
1912  block[j] = get_xbits(&s->gb, additional_code_len);
1913  } else if (group == 21) {
1914  /* Escape */
1915  if (idx > 63)
1916  return AVERROR_INVALIDDATA;
1917  j = scantable[idx++];
1918  additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
1919  flc = get_bits(&s->gb, additional_code_len);
1920  if (flc >> (additional_code_len-1))
1921  block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
1922  else
1923  block[j] = flc;
1924  }
1925  block[j] = ((block[j] * quant_matrix[j] * s->qscale) * (1 << shift)) / 16;
1926  block[j] = av_clip(block[j], min, max);
1927  mismatch ^= block[j];
1928  }
1929 
1930  block[63] ^= mismatch & 1;
1931 
1932  return 0;
1933 }
1934 
1935 static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
1936 {
1937  int i, j, w, h, idx = 0;
1938  int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
1939  dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
1940  h = 16 >> (n ? s->chroma_y_shift : 0);
1941  w = 16 >> (n ? s->chroma_x_shift : 0);
1942 
1943  block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1944  if (block_mean == 0){
1945  av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
1946  return AVERROR_INVALIDDATA;
1947  }
1948  s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));
1949 
1950  rice_parameter = get_bits(&s->gb, 4);
1951  if (rice_parameter == 0) {
1952  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1953  return AVERROR_INVALIDDATA;
1954  }
1955 
1956  if (rice_parameter == 15)
1957  rice_parameter = 0;
1958 
1959  if (rice_parameter > 11) {
1960  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1961  return AVERROR_INVALIDDATA;
1962  }
1963 
1964  for (i = 0; i < h; i++) {
1965  output = 1 << (s->avctx->bits_per_raw_sample - 1);
1966  top = 1 << (s->avctx->bits_per_raw_sample - 1);
1967 
1968  for (j = 0; j < w; j++) {
1969  left = output;
1970  topleft = top;
1971 
1972  rice_prefix_code = get_unary(&s->gb, 1, 12);
1973 
1974  /* Escape */
1975  if (rice_prefix_code == 11)
1976  dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1977  else {
1978  if (rice_prefix_code == 12) {
1979  av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
1980  return AVERROR_INVALIDDATA;
1981  }
1982  rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
1983  dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
1984  }
1985 
1986  /* Map to a signed residual */
1987  if (dpcm_residual & 1)
1988  dpcm_residual = (-1 * dpcm_residual) >> 1;
1989  else
1990  dpcm_residual = (dpcm_residual >> 1);
1991 
1992  if (i != 0)
1993  top = macroblock[idx-w];
1994 
1995  p = left + top - topleft;
1996  min_left_top = FFMIN(left, top);
1997  if (p < min_left_top)
1998  p = min_left_top;
1999 
2000  max_left_top = FFMAX(left, top);
2001  if (p > max_left_top)
2002  p = max_left_top;
2003 
2004  p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
2005  if (p2 == p)
2006  p2 = block_mean;
2007 
2008  if (p2 > p)
2009  dpcm_residual *= -1;
2010 
2011  macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
2012  }
2013  }
2014 
2015  return 0;
2016 }
2017 
2018 static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
2019 {
2020  int i;
2021 
2022  s->dpcm_direction = 0;
2023 
2024  /* StudioMacroblock */
2025  /* Assumes I-VOP */
2026  s->mb_intra = 1;
2027  if (get_bits1(&s->gb)) { /* compression_mode */
2028  /* DCT */
2029  /* macroblock_type, 1 or 2-bit VLC */
2030  if (!get_bits1(&s->gb)) {
2031  skip_bits1(&s->gb);
2032  s->qscale = mpeg_get_qscale(s);
2033  }
2034 
2035  for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
2036  if (mpeg4_decode_studio_block(s, (*s->block32)[i], i) < 0)
2037  return AVERROR_INVALIDDATA;
2038  }
2039  } else {
2040  /* DPCM */
2041  check_marker(s->avctx, &s->gb, "DPCM block start");
2042  s->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
2043  for (i = 0; i < 3; i++) {
2044  if (mpeg4_decode_dpcm_macroblock(s, (*s->dpcm_macroblock)[i], i) < 0)
2045  return AVERROR_INVALIDDATA;
2046  }
2047  }
2048 
2049  if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
2050  next_start_code_studio(&s->gb);
2051  return SLICE_END;
2052  }
2053 
2054  //vcon-stp9L1.bits (first frame)
2055  if (get_bits_left(&s->gb) == 0)
2056  return SLICE_END;
2057 
2058  //vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
2059  if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
2060  return SLICE_END;
2061 
2062  return SLICE_OK;
2063 }
2064 
2065 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
2066 {
2067  int hours, minutes, seconds;
2068 
2069  if (!show_bits(gb, 23)) {
2070  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
2071  return AVERROR_INVALIDDATA;
2072  }
2073 
2074  hours = get_bits(gb, 5);
2075  minutes = get_bits(gb, 6);
2076  check_marker(s->avctx, gb, "in gop_header");
2077  seconds = get_bits(gb, 6);
2078 
2079  s->time_base = seconds + 60*(minutes + 60*hours);
2080 
2081  skip_bits1(gb);
2082  skip_bits1(gb);
2083 
2084  return 0;
2085 }
2086 
2087 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
2088 {
2089 
2090  *profile = get_bits(gb, 4);
2091  *level = get_bits(gb, 4);
2092 
2093  // for Simple profile, level 0
2094  if (*profile == 0 && *level == 8) {
2095  *level = 0;
2096  }
2097 
2098  return 0;
2099 }
2100 
2101 static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
2102 {
2103  int visual_object_type;
2104  int is_visual_object_identifier = get_bits1(gb);
2105 
2106  if (is_visual_object_identifier) {
2107  skip_bits(gb, 4+3);
2108  }
2109  visual_object_type = get_bits(gb, 4);
2110 
2111  if (visual_object_type == VOT_VIDEO_ID ||
2112  visual_object_type == VOT_STILL_TEXTURE_ID) {
2113  int video_signal_type = get_bits1(gb);
2114  if (video_signal_type) {
2115  int video_range, color_description;
2116  skip_bits(gb, 3); // video_format
2117  video_range = get_bits1(gb);
2118  color_description = get_bits1(gb);
2119 
2120  s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
2121 
2122  if (color_description) {
2123  s->avctx->color_primaries = get_bits(gb, 8);
2124  s->avctx->color_trc = get_bits(gb, 8);
2125  s->avctx->colorspace = get_bits(gb, 8);
2126  }
2127  }
2128  }
2129 
2130  return 0;
2131 }
2132 
2133 static void mpeg4_load_default_matrices(MpegEncContext *s)
2134 {
2135  int i, v;
2136 
2137  /* load default matrices */
2138  for (i = 0; i < 64; i++) {
2139  int j = s->idsp.idct_permutation[i];
2140  v = ff_mpeg4_default_intra_matrix[i];
2141  s->intra_matrix[j] = v;
2142  s->chroma_intra_matrix[j] = v;
2143 
2144  v = ff_mpeg4_default_non_intra_matrix[i];
2145  s->inter_matrix[j] = v;
2146  s->chroma_inter_matrix[j] = v;
2147  }
2148 }
2149 
2150 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2151 {
2152  MpegEncContext *s = &ctx->m;
2153  int width, height, vo_ver_id;
2154 
2155  /* vol header */
2156  skip_bits(gb, 1); /* random access */
2157  s->vo_type = get_bits(gb, 8);
2158 
2159  /* If we are in studio profile (per vo_type), check if its all consistent
2160  * and if so continue pass control to decode_studio_vol_header().
2161  * elIf something is inconsistent, error out
2162  * else continue with (non studio) vol header decpoding.
2163  */
2164  if (s->vo_type == CORE_STUDIO_VO_TYPE ||
2165  s->vo_type == SIMPLE_STUDIO_VO_TYPE) {
2166  if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
2167  return AVERROR_INVALIDDATA;
2168  s->studio_profile = 1;
2169  s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
2170  return decode_studio_vol_header(ctx, gb);
2171  } else if (s->studio_profile) {
2172  return AVERROR_PATCHWELCOME;
2173  }
2174 
2175  if (get_bits1(gb) != 0) { /* is_ol_id */
2176  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
2177  skip_bits(gb, 3); /* vo_priority */
2178  } else {
2179  vo_ver_id = 1;
2180  }
2181  s->aspect_ratio_info = get_bits(gb, 4);
2182  if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
2183  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2184  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2185  } else {
2186  s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2187  }
2188 
2189  if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
2190  int chroma_format = get_bits(gb, 2);
2191  if (chroma_format != CHROMA_420)
2192  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2193 
2194  s->low_delay = get_bits1(gb);
2195  if (get_bits1(gb)) { /* vbv parameters */
2196  get_bits(gb, 15); /* first_half_bitrate */
2197  check_marker(s->avctx, gb, "after first_half_bitrate");
2198  get_bits(gb, 15); /* latter_half_bitrate */
2199  check_marker(s->avctx, gb, "after latter_half_bitrate");
2200  get_bits(gb, 15); /* first_half_vbv_buffer_size */
2201  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2202  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
2203  get_bits(gb, 11); /* first_half_vbv_occupancy */
2204  check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
2205  get_bits(gb, 15); /* latter_half_vbv_occupancy */
2206  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2207  }
2208  } else {
2209  /* is setting low delay flag only once the smartest thing to do?
2210  * low delay detection will not be overridden. */
2211  if (s->picture_number == 0) {
2212  switch(s->vo_type) {
2213  case SIMPLE_VO_TYPE:
2214  case ADV_SIMPLE_VO_TYPE:
2215  s->low_delay = 1;
2216  break;
2217  default:
2218  s->low_delay = 0;
2219  }
2220  }
2221  }
2222 
2223  ctx->shape = get_bits(gb, 2); /* vol shape */
2224  if (ctx->shape != RECT_SHAPE)
2225  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
2226  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
2227  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
2228  skip_bits(gb, 4); /* video_object_layer_shape_extension */
2229  }
2230 
2231  check_marker(s->avctx, gb, "before time_increment_resolution");
2232 
2233  s->avctx->framerate.num = get_bits(gb, 16);
2234  if (!s->avctx->framerate.num) {
2235  av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
2236  return AVERROR_INVALIDDATA;
2237  }
2238 
2239  ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
2240  if (ctx->time_increment_bits < 1)
2241  ctx->time_increment_bits = 1;
2242 
2243  check_marker(s->avctx, gb, "before fixed_vop_rate");
2244 
2245  if (get_bits1(gb) != 0) /* fixed_vop_rate */
2246  s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
2247  else
2248  s->avctx->framerate.den = 1;
2249 
2250  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2251 
2252  ctx->t_frame = 0;
2253 
2254  if (ctx->shape != BIN_ONLY_SHAPE) {
2255  if (ctx->shape == RECT_SHAPE) {
2256  check_marker(s->avctx, gb, "before width");
2257  width = get_bits(gb, 13);
2258  check_marker(s->avctx, gb, "before height");
2259  height = get_bits(gb, 13);
2260  check_marker(s->avctx, gb, "after height");
2261  if (width && height && /* they should be non zero but who knows */
2262  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
2263  if (s->width && s->height &&
2264  (s->width != width || s->height != height))
2265  s->context_reinit = 1;
2266  s->width = width;
2267  s->height = height;
2268  }
2269  }
2270 
2271  s->progressive_sequence =
2272  s->progressive_frame = get_bits1(gb) ^ 1;
2273  s->interlaced_dct = 0;
2274  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
2275  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
2276  "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
2277  if (vo_ver_id == 1)
2278  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
2279  else
2280  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
2281 
2282  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2283  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
2284  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
2285  ctx->vol_sprite_usage == GMC_SPRITE) {
2286  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
2287  skip_bits(gb, 13); // sprite_width
2288  check_marker(s->avctx, gb, "after sprite_width");
2289  skip_bits(gb, 13); // sprite_height
2290  check_marker(s->avctx, gb, "after sprite_height");
2291  skip_bits(gb, 13); // sprite_left
2292  check_marker(s->avctx, gb, "after sprite_left");
2293  skip_bits(gb, 13); // sprite_top
2294  check_marker(s->avctx, gb, "after sprite_top");
2295  }
2296  ctx->num_sprite_warping_points = get_bits(gb, 6);
2297  if (ctx->num_sprite_warping_points > 3) {
2298  av_log(s->avctx, AV_LOG_ERROR,
2299  "%d sprite_warping_points\n",
2300  ctx->num_sprite_warping_points);
2301  ctx->num_sprite_warping_points = 0;
2302  return AVERROR_INVALIDDATA;
2303  }
2304  s->sprite_warping_accuracy = get_bits(gb, 2);
2305  ctx->sprite_brightness_change = get_bits1(gb);
2306  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2307  skip_bits1(gb); // low_latency_sprite
2308  }
2309  // FIXME sadct disable bit if verid!=1 && shape not rect
2310 
2311  if (get_bits1(gb) == 1) { /* not_8_bit */
2312  s->quant_precision = get_bits(gb, 4); /* quant_precision */
2313  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
2314  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
2315  if (s->quant_precision != 5)
2316  av_log(s->avctx, AV_LOG_ERROR,
2317  "quant precision %d\n", s->quant_precision);
2318  if (s->quant_precision<3 || s->quant_precision>9) {
2319  s->quant_precision = 5;
2320  }
2321  } else {
2322  s->quant_precision = 5;
2323  }
2324 
2325  // FIXME a bunch of grayscale shape things
2326 
2327  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
2328  int i, v;
2329 
2330  mpeg4_load_default_matrices(s);
2331 
2332  /* load custom intra matrix */
2333  if (get_bits1(gb)) {
2334  int last = 0;
2335  for (i = 0; i < 64; i++) {
2336  int j;
2337  if (get_bits_left(gb) < 8) {
2338  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2339  return AVERROR_INVALIDDATA;
2340  }
2341  v = get_bits(gb, 8);
2342  if (v == 0)
2343  break;
2344 
2345  last = v;
2346  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2347  s->intra_matrix[j] = last;
2348  s->chroma_intra_matrix[j] = last;
2349  }
2350 
2351  /* replicate last value */
2352  for (; i < 64; i++) {
2353  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2354  s->intra_matrix[j] = last;
2355  s->chroma_intra_matrix[j] = last;
2356  }
2357  }
2358 
2359  /* load custom non intra matrix */
2360  if (get_bits1(gb)) {
2361  int last = 0;
2362  for (i = 0; i < 64; i++) {
2363  int j;
2364  if (get_bits_left(gb) < 8) {
2365  av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2366  return AVERROR_INVALIDDATA;
2367  }
2368  v = get_bits(gb, 8);
2369  if (v == 0)
2370  break;
2371 
2372  last = v;
2373  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2374  s->inter_matrix[j] = v;
2375  s->chroma_inter_matrix[j] = v;
2376  }
2377 
2378  /* replicate last value */
2379  for (; i < 64; i++) {
2380  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2381  s->inter_matrix[j] = last;
2382  s->chroma_inter_matrix[j] = last;
2383  }
2384  }
2385 
2386  // FIXME a bunch of grayscale shape things
2387  }
2388 
2389  if (vo_ver_id != 1)
2390  s->quarter_sample = get_bits1(gb);
2391  else
2392  s->quarter_sample = 0;
2393 
2394  if (get_bits_left(gb) < 4) {
2395  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
2396  return AVERROR_INVALIDDATA;
2397  }
2398 
2399  if (!get_bits1(gb)) {
2400  int pos = get_bits_count(gb);
2401  int estimation_method = get_bits(gb, 2);
2402  if (estimation_method < 2) {
2403  if (!get_bits1(gb)) {
2404  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2405  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2406  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2407  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2408  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2409  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2410  }
2411  if (!get_bits1(gb)) {
2412  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2413  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2414  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2415  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2416  }
2417  if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2418  skip_bits_long(gb, pos - get_bits_count(gb));
2419  goto no_cplx_est;
2420  }
2421  if (!get_bits1(gb)) {
2422  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2423  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2424  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2425  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2426  }
2427  if (!get_bits1(gb)) {
2428  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2429  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2430  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2431  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2432  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2433  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2434  }
2435  if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2436  skip_bits_long(gb, pos - get_bits_count(gb));
2437  goto no_cplx_est;
2438  }
2439  if (estimation_method == 1) {
2440  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2441  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2442  }
2443  } else
2444  av_log(s->avctx, AV_LOG_ERROR,
2445  "Invalid Complexity estimation method %d\n",
2446  estimation_method);
2447  } else {
2448 
2449 no_cplx_est:
2450  ctx->cplx_estimation_trash_i =
2451  ctx->cplx_estimation_trash_p =
2452  ctx->cplx_estimation_trash_b = 0;
2453  }
2454 
2455  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2456 
2457  s->data_partitioning = get_bits1(gb);
2458  if (s->data_partitioning)
2459  ctx->rvlc = get_bits1(gb);
2460 
2461  if (vo_ver_id != 1) {
2462  ctx->new_pred = get_bits1(gb);
2463  if (ctx->new_pred) {
2464  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2465  skip_bits(gb, 2); /* requested upstream message type */
2466  skip_bits1(gb); /* newpred segment type */
2467  }
2468  if (get_bits1(gb)) // reduced_res_vop
2469  av_log(s->avctx, AV_LOG_ERROR,
2470  "reduced resolution VOP not supported\n");
2471  } else {
2472  ctx->new_pred = 0;
2473  }
2474 
2475  ctx->scalability = get_bits1(gb);
2476 
2477  if (ctx->scalability) {
2478  GetBitContext bak = *gb;
2479  int h_sampling_factor_n;
2480  int h_sampling_factor_m;
2481  int v_sampling_factor_n;
2482  int v_sampling_factor_m;
2483 
2484  skip_bits1(gb); // hierarchy_type
2485  skip_bits(gb, 4); /* ref_layer_id */
2486  skip_bits1(gb); /* ref_layer_sampling_dir */
2487  h_sampling_factor_n = get_bits(gb, 5);
2488  h_sampling_factor_m = get_bits(gb, 5);
2489  v_sampling_factor_n = get_bits(gb, 5);
2490  v_sampling_factor_m = get_bits(gb, 5);
2491  ctx->enhancement_type = get_bits1(gb);
2492 
2493  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2494  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2495  /* illegal scalability header (VERY broken encoder),
2496  * trying to workaround */
2497  ctx->scalability = 0;
2498  *gb = bak;
2499  } else
2500  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2501 
2502  // bin shape stuff FIXME
2503  }
2504  }
2505 
2506  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2507  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",
2508  s->avctx->framerate.den, s->avctx->framerate.num,
2509  ctx->time_increment_bits,
2510  s->quant_precision,
2511  s->progressive_sequence,
2512  s->low_delay,
2513  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2514  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2515  );
2516  }
2517 
2518  return 0;
2519 }
2520 
2521 /**
2522  * Decode the user data stuff in the header.
2523  * Also initializes divx/xvid/lavc_version/build.
2524  */
2525 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2526 {
2527  MpegEncContext *s = &ctx->m;
2528  char buf[256];
2529  int i;
2530  int e;
2531  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2532  char last;
2533 
2534  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2535  if (show_bits(gb, 23) == 0)
2536  break;
2537  buf[i] = get_bits(gb, 8);
2538  }
2539  buf[i] = 0;
2540 
2541  /* divx detection */
2542  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2543  if (e < 2)
2544  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2545  if (e >= 2) {
2546  ctx->divx_version = ver;
2547  ctx->divx_build = build;
2548  s->divx_packed = e == 3 && last == 'p';
2549  }
2550 
2551  /* libavcodec detection */
2552  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2553  if (e != 4)
2554  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2555  if (e != 4) {
2556  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2557  if (e > 1) {
2558  if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2559  av_log(s->avctx, AV_LOG_WARNING,
2560  "Unknown Lavc version string encountered, %d.%d.%d; "
2561  "clamping sub-version values to 8-bits.\n",
2562  ver, ver2, ver3);
2563  }
2564  build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2565  }
2566  }
2567  if (e != 4) {
2568  if (strcmp(buf, "ffmpeg") == 0)
2569  ctx->lavc_build = 4600;
2570  }
2571  if (e == 4)
2572  ctx->lavc_build = build;
2573 
2574  /* Xvid detection */
2575  e = sscanf(buf, "XviD%d", &build);
2576  if (e == 1)
2577  ctx->xvid_build = build;
2578 
2579  return 0;
2580 }
2581 
2582 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2583 {
2584  Mpeg4DecContext *ctx = avctx->priv_data;
2585  MpegEncContext *s = &ctx->m;
2586 
2587  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2588  if (s->codec_tag == AV_RL32("XVID") ||
2589  s->codec_tag == AV_RL32("XVIX") ||
2590  s->codec_tag == AV_RL32("RMP4") ||
2591  s->codec_tag == AV_RL32("ZMP4") ||
2592  s->codec_tag == AV_RL32("SIPP"))
2593  ctx->xvid_build = 0;
2594  }
2595 
2596  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2597  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2598  ctx->vol_control_parameters == 0)
2599  ctx->divx_version = 400; // divx 4
2600 
2601  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2602  ctx->divx_version =
2603  ctx->divx_build = -1;
2604  }
2605 
2606  if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2607  if (s->codec_tag == AV_RL32("XVIX"))
2608  s->workaround_bugs |= FF_BUG_XVID_ILACE;
2609 
2610  if (s->codec_tag == AV_RL32("UMP4"))
2611  s->workaround_bugs |= FF_BUG_UMP4;
2612 
2613  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2614  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2615 
2616  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2617  s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2618 
2619  if (ctx->xvid_build <= 3U)
2620  s->padding_bug_score = 256 * 256 * 256 * 64;
2621 
2622  if (ctx->xvid_build <= 1U)
2623  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2624 
2625  if (ctx->xvid_build <= 12U)
2626  s->workaround_bugs |= FF_BUG_EDGE;
2627 
2628  if (ctx->xvid_build <= 32U)
2629  s->workaround_bugs |= FF_BUG_DC_CLIP;
2630 
2631 #define SET_QPEL_FUNC(postfix1, postfix2) \
2632  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2633  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2634  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2635 
2636  if (ctx->lavc_build < 4653U)
2637  s->workaround_bugs |= FF_BUG_STD_QPEL;
2638 
2639  if (ctx->lavc_build < 4655U)
2640  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2641 
2642  if (ctx->lavc_build < 4670U)
2643  s->workaround_bugs |= FF_BUG_EDGE;
2644 
2645  if (ctx->lavc_build <= 4712U)
2646  s->workaround_bugs |= FF_BUG_DC_CLIP;
2647 
2648  if ((ctx->lavc_build&0xFF) >= 100) {
2649  if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2650  (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2651  )
2652  s->workaround_bugs |= FF_BUG_IEDGE;
2653  }
2654 
2655  if (ctx->divx_version >= 0)
2656  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2657  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2658  s->padding_bug_score = 256 * 256 * 256 * 64;
2659 
2660  if (ctx->divx_version < 500U)
2661  s->workaround_bugs |= FF_BUG_EDGE;
2662 
2663  if (ctx->divx_version >= 0)
2664  s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2665  }
2666 
2667  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2668  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2669  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2670  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2671  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2672  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2673  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2674 
2675  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2676  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2677  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2678  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2679  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2680  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2681  }
2682 
2683  if (avctx->debug & FF_DEBUG_BUGS)
2684  av_log(s->avctx, AV_LOG_DEBUG,
2685  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2686  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2687  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2688 
2689  if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2690  s->codec_id == AV_CODEC_ID_MPEG4 &&
2691  avctx->idct_algo == FF_IDCT_AUTO) {
2692  avctx->idct_algo = FF_IDCT_XVID;
2693  ff_mpv_idct_init(s);
2694  return 1;
2695  }
2696 
2697  return 0;
2698 }
2699 
2700 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2701 {
2702  MpegEncContext *s = &ctx->m;
2703  int time_incr, time_increment;
2704  int64_t pts;
2705 
2706  s->mcsel = 0;
2707  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2708  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2709  ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2710  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2711  s->low_delay = 0;
2712  }
2713 
2714  s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2715  if (s->partitioned_frame)
2716  s->decode_mb = mpeg4_decode_partitioned_mb;
2717  else
2718  s->decode_mb = mpeg4_decode_mb;
2719 
2720  time_incr = 0;
2721  while (get_bits1(gb) != 0)
2722  time_incr++;
2723 
2724  check_marker(s->avctx, gb, "before time_increment");
2725 
2726  if (ctx->time_increment_bits == 0 ||
2727  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2728  av_log(s->avctx, AV_LOG_WARNING,
2729  "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);
2730 
2731  for (ctx->time_increment_bits = 1;
2732  ctx->time_increment_bits < 16;
2733  ctx->time_increment_bits++) {
2734  if (s->pict_type == AV_PICTURE_TYPE_P ||
2735  (s->pict_type == AV_PICTURE_TYPE_S &&
2736  ctx->vol_sprite_usage == GMC_SPRITE)) {
2737  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2738  break;
2739  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2740  break;
2741  }
2742 
2743  av_log(s->avctx, AV_LOG_WARNING,
2744  "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2745  if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2746  s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2747  s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2748  }
2749  }
2750 
2751  if (IS_3IV1)
2752  time_increment = get_bits1(gb); // FIXME investigate further
2753  else
2754  time_increment = get_bits(gb, ctx->time_increment_bits);
2755 
2756  if (s->pict_type != AV_PICTURE_TYPE_B) {
2757  s->last_time_base = s->time_base;
2758  s->time_base += time_incr;
2759  s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2760  if (s->workaround_bugs & FF_BUG_UMP4) {
2761  if (s->time < s->last_non_b_time) {
2762  /* header is not mpeg-4-compatible, broken encoder,
2763  * trying to workaround */
2764  s->time_base++;
2765  s->time += s->avctx->framerate.num;
2766  }
2767  }
2768  s->pp_time = s->time - s->last_non_b_time;
2769  s->last_non_b_time = s->time;
2770  } else {
2771  s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2772  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2773  if (s->pp_time <= s->pb_time ||
2774  s->pp_time <= s->pp_time - s->pb_time ||
2775  s->pp_time <= 0) {
2776  /* messed up order, maybe after seeking? skipping current B-frame */
2777  return FRAME_SKIPPED;
2778  }
2779  ff_mpeg4_init_direct_mv(s);
2780 
2781  if (ctx->t_frame == 0)
2782  ctx->t_frame = s->pb_time;
2783  if (ctx->t_frame == 0)
2784  ctx->t_frame = 1; // 1/0 protection
2785  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2786  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2787  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2788  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2789  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2790  s->pb_field_time = 2;
2791  s->pp_field_time = 4;
2792  if (!s->progressive_sequence)
2793  return FRAME_SKIPPED;
2794  }
2795  }
2796 
2797  if (s->avctx->framerate.den)
2798  pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2799  else
2800  pts = AV_NOPTS_VALUE;
2801  ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2802 
2803  check_marker(s->avctx, gb, "before vop_coded");
2804 
2805  /* vop coded */
2806  if (get_bits1(gb) != 1) {
2807  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2808  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2809  return FRAME_SKIPPED;
2810  }
2811  if (ctx->new_pred)
2812  decode_new_pred(ctx, gb);
2813 
2814  if (ctx->shape != BIN_ONLY_SHAPE &&
2815  (s->pict_type == AV_PICTURE_TYPE_P ||
2816  (s->pict_type == AV_PICTURE_TYPE_S &&
2817  ctx->vol_sprite_usage == GMC_SPRITE))) {
2818  /* rounding type for motion estimation */
2819  s->no_rounding = get_bits1(gb);
2820  } else {
2821  s->no_rounding = 0;
2822  }
2823  // FIXME reduced res stuff
2824 
2825  if (ctx->shape != RECT_SHAPE) {
2826  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2827  skip_bits(gb, 13); /* width */
2828  check_marker(s->avctx, gb, "after width");
2829  skip_bits(gb, 13); /* height */
2830  check_marker(s->avctx, gb, "after height");
2831  skip_bits(gb, 13); /* hor_spat_ref */
2832  check_marker(s->avctx, gb, "after hor_spat_ref");
2833  skip_bits(gb, 13); /* ver_spat_ref */
2834  }
2835  skip_bits1(gb); /* change_CR_disable */
2836 
2837  if (get_bits1(gb) != 0)
2838  skip_bits(gb, 8); /* constant_alpha_value */
2839  }
2840 
2841  // FIXME complexity estimation stuff
2842 
2843  if (ctx->shape != BIN_ONLY_SHAPE) {
2844  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2845  if (s->pict_type != AV_PICTURE_TYPE_I)
2846  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2847  if (s->pict_type == AV_PICTURE_TYPE_B)
2848  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2849 
2850  if (get_bits_left(gb) < 3) {
2851  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2852  return AVERROR_INVALIDDATA;
2853  }
2854  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2855  if (!s->progressive_sequence) {
2856  s->top_field_first = get_bits1(gb);
2857  s->alternate_scan = get_bits1(gb);
2858  } else
2859  s->alternate_scan = 0;
2860  }
2861 
2862  if (s->alternate_scan) {
2863  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2864  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2865  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2866  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2867  } else {
2868  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2869  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2870  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2871  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2872  }
2873 
2874  if (s->pict_type == AV_PICTURE_TYPE_S) {
2875  if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2876  ctx->vol_sprite_usage == GMC_SPRITE)) {
2877  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2878  return AVERROR_INVALIDDATA;
2879  if (ctx->sprite_brightness_change)
2880  av_log(s->avctx, AV_LOG_ERROR,
2881  "sprite_brightness_change not supported\n");
2882  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2883  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2884  } else {
2885  memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2886  memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2887  }
2888  }
2889 
2890  if (ctx->shape != BIN_ONLY_SHAPE) {
2891  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2892  if (s->qscale == 0) {
2893  av_log(s->avctx, AV_LOG_ERROR,
2894  "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2895  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2896  }
2897 
2898  if (s->pict_type != AV_PICTURE_TYPE_I) {
2899  s->f_code = get_bits(gb, 3); /* fcode_for */
2900  if (s->f_code == 0) {
2901  av_log(s->avctx, AV_LOG_ERROR,
2902  "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2903  s->f_code = 1;
2904  return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2905  }
2906  } else
2907  s->f_code = 1;
2908 
2909  if (s->pict_type == AV_PICTURE_TYPE_B) {
2910  s->b_code = get_bits(gb, 3);
2911  if (s->b_code == 0) {
2912  av_log(s->avctx, AV_LOG_ERROR,
2913  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2914  s->b_code=1;
2915  return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2916  }
2917  } else
2918  s->b_code = 1;
2919 
2920  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2921  av_log(s->avctx, AV_LOG_DEBUG,
2922  "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",
2923  s->qscale, s->f_code, s->b_code,
2924  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")),
2925  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2926  s->top_field_first, s->quarter_sample ? "q" : "h",
2927  s->data_partitioning, ctx->resync_marker,
2928  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2929  1 - s->no_rounding, s->vo_type,
2930  ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2931  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2932  ctx->cplx_estimation_trash_b,
2933  s->time,
2934  time_increment
2935  );
2936  }
2937 
2938  if (!ctx->scalability) {
2939  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2940  skip_bits1(gb); // vop shape coding type
2941  } else {
2942  if (ctx->enhancement_type) {
2943  int load_backward_shape = get_bits1(gb);
2944  if (load_backward_shape)
2945  av_log(s->avctx, AV_LOG_ERROR,
2946  "load backward shape isn't supported\n");
2947  }
2948  skip_bits(gb, 2); // ref_select_code
2949  }
2950  }
2951  /* detect buggy encoders which don't set the low_delay flag
2952  * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2953  * easily (although it's buggy too) */
2954  if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2955  ctx->divx_version == -1 && s->picture_number == 0) {
2956  av_log(s->avctx, AV_LOG_WARNING,
2957  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2958  s->low_delay = 1;
2959  }
2960 
2961  s->picture_number++; // better than pic number==0 always ;)
2962 
2963  // FIXME add short header support
2964  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2965  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2966 
2967  if (s->workaround_bugs & FF_BUG_EDGE) {
2968  s->h_edge_pos = s->width;
2969  s->v_edge_pos = s->height;
2970  }
2971  return 0;
2972 }
2973 
2974 static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
2975 {
2976  int i, j, v;
2977 
2978  if (get_bits1(gb)) {
2979  if (get_bits_left(gb) < 64*8)
2980  return AVERROR_INVALIDDATA;
2981  /* intra_quantiser_matrix */
2982  for (i = 0; i < 64; i++) {
2983  v = get_bits(gb, 8);
2984  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2985  s->intra_matrix[j] = v;
2986  s->chroma_intra_matrix[j] = v;
2987  }
2988  }
2989 
2990  if (get_bits1(gb)) {
2991  if (get_bits_left(gb) < 64*8)
2992  return AVERROR_INVALIDDATA;
2993  /* non_intra_quantiser_matrix */
2994  for (i = 0; i < 64; i++) {
2995  get_bits(gb, 8);
2996  }
2997  }
2998 
2999  if (get_bits1(gb)) {
3000  if (get_bits_left(gb) < 64*8)
3001  return AVERROR_INVALIDDATA;
3002  /* chroma_intra_quantiser_matrix */
3003  for (i = 0; i < 64; i++) {
3004  v = get_bits(gb, 8);
3005  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
3006  s->chroma_intra_matrix[j] = v;
3007  }
3008  }
3009 
3010  if (get_bits1(gb)) {
3011  if (get_bits_left(gb) < 64*8)
3012  return AVERROR_INVALIDDATA;
3013  /* chroma_non_intra_quantiser_matrix */
3014  for (i = 0; i < 64; i++) {
3015  get_bits(gb, 8);
3016  }
3017  }
3018 
3019  next_start_code_studio(gb);
3020  return 0;
3021 }
3022 
3023 static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
3024 {
3025  uint32_t startcode;
3026  uint8_t extension_type;
3027 
3028  startcode = show_bits_long(gb, 32);
3029  if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {
3030 
3031  if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
3032  skip_bits_long(gb, 32);
3033  extension_type = get_bits(gb, 4);
3034  if (extension_type == QUANT_MATRIX_EXT_ID)
3035  read_quant_matrix_ext(s, gb);
3036  }
3037  }
3038 }
3039 
3040 static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
3041 {
3042  MpegEncContext *s = &ctx->m;
3043 
3044  skip_bits(gb, 16); /* Time_code[63..48] */
3045  check_marker(s->avctx, gb, "after Time_code[63..48]");
3046  skip_bits(gb, 16); /* Time_code[47..32] */
3047  check_marker(s->avctx, gb, "after Time_code[47..32]");
3048  skip_bits(gb, 16); /* Time_code[31..16] */
3049  check_marker(s->avctx, gb, "after Time_code[31..16]");
3050  skip_bits(gb, 16); /* Time_code[15..0] */
3051  check_marker(s->avctx, gb, "after Time_code[15..0]");
3052  skip_bits(gb, 4); /* reserved_bits */
3053 }
3054 
3055 /**
3056  * Decode the next studio vop header.
3057  * @return <0 if something went wrong
3058  */
3059 static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3060 {
3061  MpegEncContext *s = &ctx->m;
3062 
3063  if (get_bits_left(gb) <= 32)
3064  return 0;
3065 
3066  s->partitioned_frame = 0;
3067  s->interlaced_dct = 0;
3068  s->decode_mb = mpeg4_decode_studio_mb;
3069 
3070  decode_smpte_tc(ctx, gb);
3071 
3072  skip_bits(gb, 10); /* temporal_reference */
3073  skip_bits(gb, 2); /* vop_structure */
3074  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
3075  if (get_bits1(gb)) { /* vop_coded */
3076  skip_bits1(gb); /* top_field_first */
3077  skip_bits1(gb); /* repeat_first_field */
3078  s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
3079  }
3080 
3081  if (s->pict_type == AV_PICTURE_TYPE_I) {
3082  if (get_bits1(gb))
3083  reset_studio_dc_predictors(s);
3084  }
3085 
3086  if (ctx->shape != BIN_ONLY_SHAPE) {
3087  s->alternate_scan = get_bits1(gb);
3088  s->frame_pred_frame_dct = get_bits1(gb);
3089  s->dct_precision = get_bits(gb, 2);
3090  s->intra_dc_precision = get_bits(gb, 2);
3091  s->q_scale_type = get_bits1(gb);
3092  }
3093 
3094  if (s->alternate_scan) {
3095  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3096  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3097  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3098  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3099  } else {
3100  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3101  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3102  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3103  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3104  }
3105 
3106  mpeg4_load_default_matrices(s);
3107 
3108  next_start_code_studio(gb);
3109  extension_and_user_data(s, gb, 4);
3110 
3111  return 0;
3112 }
3113 
3114 static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
3115 {
3116  MpegEncContext *s = &ctx->m;
3117  int visual_object_type;
3118 
3119  skip_bits(gb, 4); /* visual_object_verid */
3120  visual_object_type = get_bits(gb, 4);
3121  if (visual_object_type != VOT_VIDEO_ID) {
3122  avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
3123  return AVERROR_PATCHWELCOME;
3124  }
3125 
3126  next_start_code_studio(gb);
3127  extension_and_user_data(s, gb, 1);
3128 
3129  return 0;
3130 }
3131 
3132 static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3133 {
3134  MpegEncContext *s = &ctx->m;
3135  int width, height;
3136  int bits_per_raw_sample;
3137  int rgb, chroma_format;
3138 
3139  // random_accessible_vol and video_object_type_indication have already
3140  // been read by the caller decode_vol_header()
3141  skip_bits(gb, 4); /* video_object_layer_verid */
3142  ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
3143  skip_bits(gb, 4); /* video_object_layer_shape_extension */
3144  skip_bits1(gb); /* progressive_sequence */
3145  if (ctx->shape != RECT_SHAPE) {
3146  avpriv_request_sample(s->avctx, "MPEG-4 Studio profile non rectangular shape");
3147  return AVERROR_PATCHWELCOME;
3148  }
3149  if (ctx->shape != BIN_ONLY_SHAPE) {
3150  rgb = get_bits1(gb); /* rgb_components */
3151  chroma_format = get_bits(gb, 2); /* chroma_format */
3152  if (!chroma_format || chroma_format == CHROMA_420 || (rgb && chroma_format == CHROMA_422)) {
3153  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
3154  return AVERROR_INVALIDDATA;
3155  }
3156 
3157  bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
3158  if (bits_per_raw_sample == 10) {
3159  if (rgb) {
3160  s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
3161  }
3162  else {
3163  s->avctx->pix_fmt = chroma_format == CHROMA_422 ? AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV444P10;
3164  }
3165  }
3166  else {
3167  avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
3168  return AVERROR_PATCHWELCOME;
3169  }
3170  if (rgb != ctx->rgb || s->chroma_format != chroma_format)
3171  s->context_reinit = 1;
3172  s->avctx->bits_per_raw_sample = bits_per_raw_sample;
3173  ctx->rgb = rgb;
3174  s->chroma_format = chroma_format;
3175  }
3176  if (ctx->shape == RECT_SHAPE) {
3177  check_marker(s->avctx, gb, "before video_object_layer_width");
3178  width = get_bits(gb, 14); /* video_object_layer_width */
3179  check_marker(s->avctx, gb, "before video_object_layer_height");
3180  height = get_bits(gb, 14); /* video_object_layer_height */
3181  check_marker(s->avctx, gb, "after video_object_layer_height");
3182 
3183  /* Do the same check as non-studio profile */
3184  if (width && height) {
3185  if (s->width && s->height &&
3186  (s->width != width || s->height != height))
3187  s->context_reinit = 1;
3188  s->width = width;
3189  s->height = height;
3190  }
3191  }
3192  s->aspect_ratio_info = get_bits(gb, 4);
3193  if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
3194  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
3195  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
3196  } else {
3197  s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
3198  }
3199  skip_bits(gb, 4); /* frame_rate_code */
3200  skip_bits(gb, 15); /* first_half_bit_rate */
3201  check_marker(s->avctx, gb, "after first_half_bit_rate");
3202  skip_bits(gb, 15); /* latter_half_bit_rate */
3203  check_marker(s->avctx, gb, "after latter_half_bit_rate");
3204  skip_bits(gb, 15); /* first_half_vbv_buffer_size */
3205  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
3206  skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
3207  skip_bits(gb, 11); /* first_half_vbv_buffer_size */
3208  check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
3209  skip_bits(gb, 15); /* latter_half_vbv_occupancy */
3210  check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
3211  s->low_delay = get_bits1(gb);
3212  s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */
3213 
3214  next_start_code_studio(gb);
3215  extension_and_user_data(s, gb, 2);
3216 
3217  return 0;
3218 }
3219 
3220 /**
3221  * Decode MPEG-4 headers.
3222  *
3223  * @param header If set the absence of a VOP is not treated as error; otherwise, it is treated as such.
3224  * @return <0 if an error occurred
3225  * FRAME_SKIPPED if a not coded VOP is found
3226  * 0 else
3227  */
3228 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header)
3229 {
3230  MpegEncContext *s = &ctx->m;
3231  unsigned startcode, v;
3232  int ret;
3233  int vol = 0;
3234 
3235  /* search next start code */
3236  align_get_bits(gb);
3237 
3238  // If we have not switched to studio profile than we also did not switch bps
3239  // that means something else (like a previous instance) outside set bps which
3240  // would be inconsistant with the currect state, thus reset it
3241  if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
3242  s->avctx->bits_per_raw_sample = 0;
3243 
3244  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
3245  skip_bits(gb, 24);
3246  if (get_bits(gb, 8) == 0xF0)
3247  goto end;
3248  }
3249 
3250  startcode = 0xff;
3251  for (;;) {
3252  if (get_bits_count(gb) >= gb->size_in_bits) {
3253  if (gb->size_in_bits == 8 &&
3254  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
3255  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
3256  return FRAME_SKIPPED; // divx bug
3257  } else if (header && get_bits_count(gb) == gb->size_in_bits) {
3258  return 0; // ordinary return value for parsing of extradata
3259  } else
3260  return AVERROR_INVALIDDATA; // end of stream
3261  }
3262 
3263  /* use the bits after the test */
3264  v = get_bits(gb, 8);
3265  startcode = ((startcode << 8) | v) & 0xffffffff;
3266 
3267  if ((startcode & 0xFFFFFF00) != 0x100)
3268  continue; // no startcode
3269 
3270  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
3271  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
3272  if (startcode <= 0x11F)
3273  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
3274  else if (startcode <= 0x12F)
3275  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
3276  else if (startcode <= 0x13F)
3277  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3278  else if (startcode <= 0x15F)
3279  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
3280  else if (startcode <= 0x1AF)
3281  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3282  else if (startcode == 0x1B0)
3283  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
3284  else if (startcode == 0x1B1)
3285  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
3286  else if (startcode == 0x1B2)
3287  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
3288  else if (startcode == 0x1B3)
3289  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
3290  else if (startcode == 0x1B4)
3291  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
3292  else if (startcode == 0x1B5)
3293  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
3294  else if (startcode == 0x1B6)
3295  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
3296  else if (startcode == 0x1B7)
3297  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
3298  else if (startcode == 0x1B8)
3299  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
3300  else if (startcode == 0x1B9)
3301  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
3302  else if (startcode == 0x1BA)
3303  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
3304  else if (startcode == 0x1BB)
3305  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
3306  else if (startcode == 0x1BC)
3307  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
3308  else if (startcode == 0x1BD)
3309  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
3310  else if (startcode == 0x1BE)
3311  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
3312  else if (startcode == 0x1BF)
3313  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
3314  else if (startcode == 0x1C0)
3315  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
3316  else if (startcode == 0x1C1)
3317  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
3318  else if (startcode == 0x1C2)
3319  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
3320  else if (startcode == 0x1C3)
3321  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
3322  else if (startcode <= 0x1C5)
3323  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
3324  else if (startcode <= 0x1FF)
3325  av_log(s->avctx, AV_LOG_DEBUG, "System start");
3326  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
3327  }
3328 
3329  if (startcode >= 0x120 && startcode <= 0x12F) {
3330  if (vol) {
3331  av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
3332  continue;
3333  }
3334  vol++;
3335  if ((ret = decode_vol_header(ctx, gb)) < 0)
3336  return ret;
3337  } else if (startcode == USER_DATA_STARTCODE) {
3338  decode_user_data(ctx, gb);
3339  } else if (startcode == GOP_STARTCODE) {
3340  mpeg4_decode_gop_header(s, gb);
3341  } else if (startcode == VOS_STARTCODE) {
3342  int profile, level;
3343  mpeg4_decode_profile_level(s, gb, &profile, &level);
3344  if (profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO &&
3345  (level > 0 && level < 9)) {
3346  s->studio_profile = 1;
3347  next_start_code_studio(gb);
3348  extension_and_user_data(s, gb, 0);
3349  } else if (s->studio_profile) {
3350  avpriv_request_sample(s->avctx, "Mixes studio and non studio profile\n");
3351  return AVERROR_PATCHWELCOME;
3352  }
3353  s->avctx->profile = profile;
3354  s->avctx->level = level;
3355  } else if (startcode == VISUAL_OBJ_STARTCODE) {
3356  if (s->studio_profile) {
3357  if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
3358  return ret;
3359  } else
3360  mpeg4_decode_visual_object(s, gb);
3361  } else if (startcode == VOP_STARTCODE) {
3362  break;
3363  }
3364 
3365  align_get_bits(gb);
3366  startcode = 0xff;
3367  }
3368 
3369 end:
3370  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
3371  s->low_delay = 1;
3372  s->avctx->has_b_frames = !s->low_delay;
3373 
3374  if (s->studio_profile) {
3375  if (!s->avctx->bits_per_raw_sample) {
3376  av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
3377  return AVERROR_INVALIDDATA;
3378  }
3379  return decode_studio_vop_header(ctx, gb);
3380  } else
3381  return decode_vop_header(ctx, gb);
3382 }
3383 
3384 av_cold void ff_mpeg4videodec_static_init(void) {
3385  static int done = 0;
3386 
3387  if (!done) {
3388  ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
3389  ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
3390  ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
3391  INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
3392  INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
3393  INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
3394  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
3395  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
3396  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
3397  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
3398  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
3399  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
3400  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
3401  &ff_sprite_trajectory_tab[0][1], 4, 2,
3402  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
3403  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
3404  &ff_mb_type_b_tab[0][1], 2, 1,
3405  &ff_mb_type_b_tab[0][0], 2, 1, 16);
3406  done = 1;
3407  }
3408 }
3409 
3410 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
3411 {
3412  Mpeg4DecContext *ctx = avctx->priv_data;
3413  MpegEncContext *s = &ctx->m;
3414 
3415  /* divx 5.01+ bitstream reorder stuff */
3416  /* Since this clobbers the input buffer and hwaccel codecs still need the
3417  * data during hwaccel->end_frame we should not do this any earlier */
3418  if (s->divx_packed) {
3419  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
3420  int startcode_found = 0;
3421 
3422  if (buf_size - current_pos > 7) {
3423 
3424  int i;
3425  for (i = current_pos; i < buf_size - 4; i++)
3426 
3427  if (buf[i] == 0 &&
3428  buf[i + 1] == 0 &&
3429  buf[i + 2] == 1 &&
3430  buf[i + 3] == 0xB6) {
3431  startcode_found = !(buf[i + 4] & 0x40);
3432  break;
3433  }
3434  }
3435 
3436  if (startcode_found) {
3437  if (!ctx->showed_packed_warning) {
3438  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
3439  "wasteful way to store B-frames ('packed B-frames'). "
3440  "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
3441  ctx->showed_packed_warning = 1;
3442  }
3443  av_fast_padded_malloc(&s->bitstream_buffer,
3444  &s->allocated_bitstream_buffer_size,
3445  buf_size - current_pos);
3446  if (!s->bitstream_buffer) {
3447  s->bitstream_buffer_size = 0;
3448  return AVERROR(ENOMEM);
3449  }
3450  memcpy(s->bitstream_buffer, buf + current_pos,
3451  buf_size - current_pos);
3452  s->bitstream_buffer_size = buf_size - current_pos;
3453  }
3454  }
3455 
3456  return 0;
3457 }
3458 
3459 #if HAVE_THREADS
3460 static int mpeg4_update_thread_context(AVCodecContext *dst,
3461  const AVCodecContext *src)
3462 {
3463  Mpeg4DecContext *s = dst->priv_data;
3464  const Mpeg4DecContext *s1 = src->priv_data;
3465  int init = s->m.context_initialized;
3466 
3467  int ret = ff_mpeg_update_thread_context(dst, src);
3468 
3469  if (ret < 0)
3470  return ret;
3471 
3472  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
3473 
3474  if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
3475  ff_xvid_idct_init(&s->m.idsp, dst);
3476 
3477  return 0;
3478 }
3479 #endif
3480 
3481 static av_cold int init_studio_vlcs(Mpeg4DecContext *ctx)
3482 {
3483  int i, ret;
3484 
3485  for (i = 0; i < 12; i++) {
3486  ret = init_vlc(&ctx->studio_intra_tab[i], STUDIO_INTRA_BITS, 22,
3487  &ff_mpeg4_studio_intra[i][0][1], 4, 2,
3488  &ff_mpeg4_studio_intra[i][0][0], 4, 2,
3489  0);
3490 
3491  if (ret < 0)
3492  return ret;
3493  }
3494 
3495  ret = init_vlc(&ctx->studio_luma_dc, STUDIO_INTRA_BITS, 19,
3496  &ff_mpeg4_studio_dc_luma[0][1], 4, 2,
3497  &ff_mpeg4_studio_dc_luma[0][0], 4, 2,
3498  0);
3499  if (ret < 0)
3500  return ret;
3501 
3502  ret = init_vlc(&ctx->studio_chroma_dc, STUDIO_INTRA_BITS, 19,
3503  &ff_mpeg4_studio_dc_chroma[0][1], 4, 2,
3504  &ff_mpeg4_studio_dc_chroma[0][0], 4, 2,
3505  0);
3506  if (ret < 0)
3507  return ret;
3508 
3509  return 0;
3510 }
3511 
3512 static av_cold int decode_init(AVCodecContext *avctx)
3513 {
3514  Mpeg4DecContext *ctx = avctx->priv_data;
3515  MpegEncContext *s = &ctx->m;
3516  int ret;
3517 
3518  ctx->divx_version =
3519  ctx->divx_build =
3520  ctx->xvid_build =
3521  ctx->lavc_build = -1;
3522 
3523  if ((ret = ff_h263_decode_init(avctx)) < 0)
3524  return ret;
3525 
3526  ff_mpeg4videodec_static_init();
3527  if ((ret = init_studio_vlcs(ctx)) < 0)
3528  return ret;
3529 
3530  s->h263_pred = 1;
3531  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
3532  s->decode_mb = mpeg4_decode_mb;
3533  ctx->time_increment_bits = 4; /* default value for broken headers */
3534 
3535  avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
3536  avctx->internal->allocate_progress = 1;
3537 
3538  return 0;
3539 }
3540 
3541 static av_cold int decode_end(AVCodecContext *avctx)
3542 {
3543  Mpeg4DecContext *ctx = avctx->priv_data;
3544  int i;
3545 
3546  if (!avctx->internal->is_copy) {
3547  for (i = 0; i < 12; i++)
3548  ff_free_vlc(&ctx->studio_intra_tab[i]);
3549 
3550  ff_free_vlc(&ctx->studio_luma_dc);
3551  ff_free_vlc(&ctx->studio_chroma_dc);
3552  }
3553 
3554  return ff_h263_decode_end(avctx);
3555 }
3556 
3557 static const AVOption mpeg4_options[] = {
3558  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
3559  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
3560  {NULL}
3561 };
3562 
3563 static const AVClass mpeg4_class = {
3564  .class_name = "MPEG4 Video Decoder",
3565  .item_name = av_default_item_name,
3566  .option = mpeg4_options,
3567  .version = LIBAVUTIL_VERSION_INT,
3568 };
3569 
3570 AVCodec ff_mpeg4_decoder = {
3571  .name = "mpeg4",
3572  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
3573  .type = AVMEDIA_TYPE_VIDEO,
3574  .id = AV_CODEC_ID_MPEG4,
3575  .priv_data_size = sizeof(Mpeg4DecContext),
3576  .init = decode_init,
3577  .close = decode_end,
3578  .decode = ff_h263_decode_frame,
3579  .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
3580  AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
3581  AV_CODEC_CAP_FRAME_THREADS,
3582  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
3583  .flush = ff_mpeg_flush,
3584  .max_lowres = 3,
3585  .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
3586  .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
3587  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
3588  .priv_class = &mpeg4_class,
3589  .hw_configs = (const AVCodecHWConfigInternal*[]) {
3590 #if CONFIG_MPEG4_NVDEC_HWACCEL
3591  HWACCEL_NVDEC(mpeg4),
3592 #endif
3593 #if CONFIG_MPEG4_VAAPI_HWACCEL
3594  HWACCEL_VAAPI(mpeg4),
3595 #endif
3596 #if CONFIG_MPEG4_VDPAU_HWACCEL
3597  HWACCEL_VDPAU(mpeg4),
3598 #endif
3599 #if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
3600  HWACCEL_VIDEOTOOLBOX(mpeg4),
3601 #endif
3602  NULL
3603  },
3604 };
ff_mpeg4videodec_static_init
av_cold void ff_mpeg4videodec_static_init(void)
Definition: mpeg4videodec.c:3384
HWACCEL_NVDEC
#define HWACCEL_NVDEC(codec)
Definition: hwaccel.h:71
AVCodec
AVCodec.
Definition: avcodec.h:3481
IS_8X8
#define IS_8X8(a)
Definition: mpegutils.h:89
MB_TYPE_L0
#define MB_TYPE_L0
Definition: mpegutils.h:67
stride
int stride
Definition: mace.c:144
FF_BUG_DC_CLIP
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2611
ff_mpeg4_video_profiles
const AVProfile ff_mpeg4_video_profiles[]
Definition: profiles.c:106
MV_TYPE_16X16
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:291
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
mpeg4_class
static const AVClass mpeg4_class
Definition: mpeg4videodec.c:3563
ff_init_scantable
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
FF_ASPECT_EXTENDED
#define FF_ASPECT_EXTENDED
Definition: h263.h:30
level
uint8_t level
Definition: svq3.c:207
VISUAL_OBJ_STARTCODE
#define VISUAL_OBJ_STARTCODE
Definition: mpeg4video.h:64
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
show_bits_long
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:602
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
IS_ACPRED
#define IS_ACPRED(a)
Definition: mpegutils.h:94
r
const char * r
Definition: vf_curves.c:114
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
ff_xvid_idct_init
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: xvididct.c:333
mpeg4_block_count
static const uint8_t mpeg4_block_count[4]
Definition: mpeg4video.h:125
n
int n
Definition: avisynth_c.h:760
mpeg_get_qscale
static int mpeg_get_qscale(MpegEncContext *s)
Definition: mpegvideo.h:761
INIT_VLC_STATIC
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:75
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
MB_TYPE_16x8
#define MB_TYPE_16x8
Definition: mpegutils.h:55
output
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
Definition: filter_design.txt:225
MAX_RUN
#define MAX_RUN
Definition: rl.h:35
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:1042
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
VOT_VIDEO_ID
#define VOT_VIDEO_ID
Definition: mpeg4video.h:48
ac_state_tab
static const uint8_t ac_state_tab[22][2]
Definition: mpeg4videodec.c:1791
ff_sprite_trajectory_tab
const uint16_t ff_sprite_trajectory_tab[15][2]
Definition: mpeg4data.h:326
GetBitContext::size_in_bits
int size_in_bits
Definition: get_bits.h:68
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
AV_CODEC_ID_MPEG4
@ AV_CODEC_ID_MPEG4
Definition: avcodec.h:230
profile
mfxU16 profile
Definition: qsvenc.c:44
end
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
AV_CODEC_CAP_TRUNCATED
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:982
pixdesc.h
w
uint8_t w
Definition: llviddspenc.c:38
STATIC_SPRITE
#define STATIC_SPRITE
Definition: mpeg4video.h:55
FF_BUG_EDGE
#define FF_BUG_EDGE
Definition: avcodec.h:2609
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
the normal 2^n-1 "JPEG" YUV ranges
Definition: pixfmt.h:522
internal.h
BIN_ONLY_SHAPE
#define BIN_ONLY_SHAPE
Definition: mpeg4video.h:35
mpeg4_decode_studio_mb
static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
Definition: mpeg4videodec.c:2018
ADV_SIMPLE_VO_TYPE
#define ADV_SIMPLE_VO_TYPE
Definition: mpeg4video.h:46
ff_mpeg4_decode_studio_slice_header
int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
Decode the next video packet.
Definition: mpeg4videodec.c:548
AVOption
AVOption.
Definition: opt.h:246
init_vlc
#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
Definition: vlc.h:38
mpeg4_decode_gop_header
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
Definition: mpeg4videodec.c:2065
MB_TYPE_16x16
#define MB_TYPE_16x16
Definition: mpegutils.h:54
decode_studiovisualobject
static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:3114
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:797
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
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:1918
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:830
ff_init_block_index
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2281
max
#define max(a, b)
Definition: cuda_runtime.h:33
ff_tlog
#define ff_tlog(ctx,...)
Definition: internal.h:75
mpegvideo.h
AV_EF_COMPLIANT
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2709
MB_TYPE_L1
#define MB_TYPE_L1
Definition: mpegutils.h:68
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:178
FF_BUG_HPEL_CHROMA
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2610
ER_DC_END
#define ER_DC_END
Definition: error_resilience.h:35
decode_smpte_tc
static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:3040
mpegutils.h
FF_PROFILE_MPEG4_SIMPLE_STUDIO
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO
Definition: avcodec.h:2972
FF_IDCT_AUTO
#define FF_IDCT_AUTO
Definition: avcodec.h:2769
mpeg4_decode_visual_object
static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
Definition: mpeg4videodec.c:2101
ER_MV_ERROR
#define ER_MV_ERROR
Definition: error_resilience.h:33
thread.h
ff_thread_await_progress
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before ff_thread_await_progress() has been called on them. reget_buffer() and buffer age optimizations no longer work. *The contents of buffers must not be written to after ff_thread_report_progress() has been called on them. This includes draw_edges(). Porting codecs to frame threading
ff_mpeg4_resync_prefix
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
ff_mpeg4_studio_dc_chroma
const uint16_t ff_mpeg4_studio_dc_chroma[19][2]
Definition: mpeg4data.h:385
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2651
MV_DIR_BACKWARD
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:263
FF_IDCT_XVID
#define FF_IDCT_XVID
Definition: avcodec.h:2776
GET_CACHE
#define GET_CACHE(name, gb)
Definition: get_bits.h:215
VOT_STILL_TEXTURE_ID
#define VOT_STILL_TEXTURE_ID
Definition: mpeg4video.h:49
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
ff_mpeg4_frame_end
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg4videodec.c:3410
AVCodecInternal::is_copy
int is_copy
Whether the parent AVCodecContext is a copy of the context which had init() called on it.
Definition: internal.h:136
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
VOS_STARTCODE
#define VOS_STARTCODE
Definition: mpeg4video.h:61
ff_mpeg4_DCtab_chrom
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
decode_user_data
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the user data stuff in the header.
Definition: mpeg4videodec.c:2525
SKIP_CACHE
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:180
get_amv
static int get_amv(Mpeg4DecContext *ctx, int n)
Get the average motion vector for a GMC MB.
Definition: mpeg4videodec.c:590
INTRA_MCBPC_VLC_BITS
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:37
ff_h263_pred_motion
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:307
ff_mpeg4_studio_intra
const uint16_t ff_mpeg4_studio_intra[12][22][2]
Definition: mpeg4data.h:393
U
#define U(x)
Definition: vp56_arith.h:37
ff_h263_intra_MCBPC_vlc
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
MB_TYPE_B_VLC_BITS
#define MB_TYPE_B_VLC_BITS
Definition: mpeg4videodec.c:48
STUDIO_INTRA_BITS
#define STUDIO_INTRA_BITS
Definition: mpeg4videodec.c:49
FF_BUG_QPEL_CHROMA2
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:2607
AV_PIX_FMT_GBRP10
#define AV_PIX_FMT_GBRP10
Definition: pixfmt.h:403
ff_mpeg4_pred_ac
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:69
ff_rvlc_rl_intra
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
ff_h263_pixel_aspect
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
RLTable
RLTable.
Definition: rl.h:39
ff_mpeg4_get_video_packet_prefix_length
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
GetBitContext
Definition: get_bits.h:61
CORE_STUDIO_VO_TYPE
#define CORE_STUDIO_VO_TYPE
Definition: mpeg4video.h:45
ff_rvlc_rl_inter
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
USES_LIST
#define USES_LIST(a, list)
Definition: mpegutils.h:99
mpeg4_decode_profile_level
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
Definition: mpeg4videodec.c:2087
AV_CODEC_FLAG_LOW_DELAY
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:900
pts
static int64_t pts
Definition: transcode_aac.c:647
SLICE_END
#define SLICE_END
end marker found
Definition: mpegvideo.h:518
src
#define src
Definition: vp8dsp.c:254
HWACCEL_VIDEOTOOLBOX
@ HWACCEL_VIDEOTOOLBOX
Definition: ffmpeg.h:62
CBPY_VLC_BITS
#define CBPY_VLC_BITS
Definition: h263.h:39
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
DC_VLC_BITS
#define DC_VLC_BITS
Definition: mpeg4videodec.c:47
AV_PIX_FMT_YUV444P10
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:390
AV_EF_BITSTREAM
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2703
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
buf
void * buf
Definition: avisynth_c.h:766
ER_DC_ERROR
#define ER_DC_ERROR
Definition: error_resilience.h:32
av_cold
#define av_cold
Definition: attributes.h:84
ff_mpeg4_decode_partitions
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
Definition: mpeg4videodec.c:977
extension_and_user_data
static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
Definition: mpeg4videodec.c:3023
MB_TYPE_ACPRED
#define MB_TYPE_ACPRED
Definition: mpegutils.h:60
ff_mpeg4_set_direct_mv
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:149
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
hwaccel.h
width
#define width
RLTable::max_level
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:46
s
#define s(width, name)
Definition: cbs_vp9.c:257
CHROMA_422
#define CHROMA_422
Definition: mpegvideo.h:484
ff_mpeg4_decode_picture_header
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header)
Decode MPEG-4 headers.
Definition: mpeg4videodec.c:3228
GOP_STARTCODE
#define GOP_STARTCODE
Definition: mpeg4video.h:63
s1
#define s1
Definition: regdef.h:38
SHOW_SBITS
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:212
FF_BUG_NO_PADDING
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2603
ff_mpeg4_rl_intra
RLTable ff_mpeg4_rl_intra
Definition: mpeg4data.h:109
bits
uint8_t bits
Definition: vp3data.h:202
FF_PROFILE_UNKNOWN
#define FF_PROFILE_UNKNOWN
Definition: avcodec.h:2899
dc_lum
static VLC dc_lum
Definition: mpeg4videodec.c:53
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
ctx
AVFormatContext * ctx
Definition: movenc.c:48
ff_mpeg4_workaround_bugs
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
Definition: mpeg4videodec.c:2582
GRAY_SHAPE
#define GRAY_SHAPE
Definition: mpeg4video.h:36
IS_SKIP
#define IS_SKIP(a)
Definition: mpegutils.h:81
mpeg4_decode_mb
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: mpeg4videodec.c:1400
SKIP_BITS
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:193
IS_INTRA
#define IS_INTRA(x, y)
ff_free_vlc
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:359
xvididct.h
RSHIFT
#define RSHIFT(a, b)
Definition: common.h:54
GMC_SPRITE
#define GMC_SPRITE
Definition: mpeg4video.h:56
FF_BUG_DIRECT_BLOCKSIZE
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2608
int32_t
int32_t
Definition: audio_convert.c:194
mpeg4_decode_sprite_trajectory
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:174
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
if
if(ret)
Definition: filter_design.txt:179
ff_mpeg4_DCtab_lum
const uint8_t ff_mpeg4_DCtab_lum[13][2]
Definition: mpeg4data.h:35
FRAME_SKIPPED
#define FRAME_SKIPPED
Return value for header parsers if frame is not coded.
Definition: mpegutils.h:34
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1037
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: mpeg4videodec.c:3541
mb_type_b_map
static const int mb_type_b_map[4]
Definition: mpeg4videodec.c:57
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
mpeg4_load_default_matrices
static void mpeg4_load_default_matrices(MpegEncContext *s)
Definition: mpeg4videodec.c:2133
FF_BUG_UMP4
#define FF_BUG_UMP4
Definition: avcodec.h:2602
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
flush
static void flush(AVCodecContext *avctx)
Definition: aacdec_template.c:500
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
run
uint8_t run
Definition: svq3.c:206
FF_BUG_STD_QPEL
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2606
ff_mpv_idct_init
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:330
AVCHROMA_LOC_LEFT
@ AVCHROMA_LOC_LEFT
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
Definition: pixfmt.h:543
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
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:1313
MB_TYPE_GMC
#define MB_TYPE_GMC
Definition: mpegutils.h:61
mpeg4_decode_studio_block
static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n)
Definition: mpeg4videodec.c:1817
AVCodecContext::internal
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1600
SLICE_NOEND
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:519
MB_TYPE_8x8
#define MB_TYPE_8x8
Definition: mpegutils.h:57
ff_h263_hwaccel_pixfmt_list_420
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:729
ROUNDED_DIV
#define ROUNDED_DIV(a, b)
Definition: common.h:56
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
profiles.h
ff_set_qscale
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2345
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:199
FF_BUG_IEDGE
#define FF_BUG_IEDGE
Definition: avcodec.h:2614
ONLY_IF_THREADS_ENABLED
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:227
SET_QPEL_FUNC
#define SET_QPEL_FUNC(postfix1, postfix2)
Mpeg4DecContext
Definition: mpeg4video.h:74
ff_alternate_horizontal_scan
const uint8_t ff_alternate_horizontal_scan[64]
Definition: mpegvideodata.c:89
FASTDIV
#define FASTDIV(a, b)
Definition: mathops.h:202
AV_PIX_FMT_YUV422P10
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:388
ff_mpeg4_dc_threshold
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
get_unary
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
MV_TYPE_8X8
#define MV_TYPE_8X8
4 vectors (H.263, MPEG-4 4MV)
Definition: mpegvideo.h:267
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
MAX_LEVEL
#define MAX_LEVEL
Definition: rl.h:36
mpeg4_decode_partition_a
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
Decode first partition.
Definition: mpeg4videodec.c:690
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981
ff_h263_decode_motion
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:270
AV_EF_IGNORE_ERR
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2707
ff_h263_rl_inter
RLTable ff_h263_rl_inter
Definition: h263data.c:161
dc
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled top and top right vectors is used as motion vector prediction the used motion vector is the sum of the predictor and(mvx_diff, mvy_diff) *mv_scale Intra DC Prediction block[y][x] dc[1]
Definition: snow.txt:400
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:188
ff_mpeg4_y_dc_scale_table
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
RL_VLC_ELEM
Definition: vlc.h:32
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:202
AVCodecInternal::allocate_progress
int allocate_progress
Whether to allocate progress for frame threading.
Definition: internal.h:151
FFMAX
#define FFMAX(a, b)
Definition: common.h:94
FF_DEBUG_BUGS
#define FF_DEBUG_BUGS
Definition: avcodec.h:2667
ff_mpeg4_default_intra_matrix
const int16_t ff_mpeg4_default_intra_matrix[64]
Definition: mpeg4data.h:337
read_quant_matrix_ext
static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
Definition: mpeg4videodec.c:2974
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
MB_TYPE_SKIP
#define MB_TYPE_SKIP
Definition: mpegutils.h:62
ff_mpeg_flush
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2314
AVCodecHWConfigInternal
Definition: hwaccel.h:29
header
static const uint8_t header[24]
Definition: sdr2.c:67
MB_TYPE_INTERLACED
#define MB_TYPE_INTERLACED
Definition: mpegutils.h:58
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:138
INTER_MCBPC_VLC_BITS
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:38
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
height
#define height
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
ff_mpeg4_default_non_intra_matrix
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:348
ff_mpeg_update_thread_context
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:495
mpegvideodata.h
MV_TYPE_FIELD
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:269
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:321
skip_bits1
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:538
IS_DIRECT
#define IS_DIRECT(a)
Definition: mpegutils.h:84
unary.h
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
DC_MARKER
#define DC_MARKER
Definition: mpeg4video.h:59
ff_update_block_index
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:737
MB_TYPE_L0L1
#define MB_TYPE_L0L1
Definition: mpegutils.h:69
init_studio_vlcs
static av_cold int init_studio_vlcs(Mpeg4DecContext *ctx)
Definition: mpeg4videodec.c:3481
EXT_STARTCODE
#define EXT_STARTCODE
Definition: mpeg4video.h:67
ff_h263_decode_init
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:68
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
mpeg4_decode_dc
static int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Decode the dc value.
Definition: mpeg4videodec.c:643
SKIP_COUNTER
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:185
CHROMA_420
#define CHROMA_420
Definition: mpegvideo.h:483
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
ff_mpeg4_decoder
AVCodec ff_mpeg4_decoder
Definition: mpeg4videodec.c:3570
ff_alternate_vertical_scan
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideodata.c:100
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
RLTable::max_run
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:47
internal.h
ff_mpeg4_decode_video_packet_header
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
Definition: mpeg4videodec.c:447
ff_h263_decode_end
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:155
SIMPLE_STUDIO_VO_TYPE
#define SIMPLE_STUDIO_VO_TYPE
Definition: mpeg4video.h:44
ff_h263_cbpy_vlc
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
FF_BUG_AUTODETECT
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2600
delta
float delta
Definition: vorbis_enc_data.h:457
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:70
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dv.h:96
FF_DEBUG_STARTCODE
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2664
uint8_t
uint8_t
Definition: audio_convert.c:194
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2768
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3488
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2207
len
int len
Definition: vorbis_enc_data.h:452
USER_DATA_STARTCODE
#define USER_DATA_STARTCODE
Definition: mpeg4video.h:62
FF_BUG_QPEL_CHROMA
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2605
AVCOL_RANGE_MPEG
@ AVCOL_RANGE_MPEG
the normal 219*2^(n-8) "MPEG" YUV ranges
Definition: pixfmt.h:521
idctdsp.h
SPRITE_TRAJ_VLC_BITS
#define SPRITE_TRAJ_VLC_BITS
Definition: mpeg4videodec.c:46
GET_RL_VLC
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:738
ff_zigzag_direct
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
av_uninit
#define av_uninit(x)
Definition: attributes.h:148
ret
ret
Definition: filter_design.txt:187
SLICE_OK
#define SLICE_OK
Definition: mpegvideo.h:516
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:693
dc_chrom
static VLC dc_chrom
Definition: mpeg4videodec.c:53
ff_mpeg4_init_direct_mv
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:71
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:88
decode_vop_header
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:2700
AVCodecContext
main external API structure.
Definition: avcodec.h:1565
HWACCEL_VAAPI
#define HWACCEL_VAAPI(codec)
Definition: hwaccel.h:73
mpeg4_decode_partition_b
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
decode second partition.
Definition: mpeg4videodec.c:884
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
ff_mb_type_b_tab
const uint8_t ff_mb_type_b_tab[4][2]
Definition: mpeg4data.h:332
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
mpeg4video.h
error_resilience.h
VLC
Definition: vlc.h:26
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
mpeg4_options
static const AVOption mpeg4_options[]
Definition: mpeg4videodec.c:3557
profiles
static const AVProfile profiles[]
Definition: libfdk-aacenc.c:426
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:1006
decode_studio_vol_header
static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:3132
RECT_SHAPE
#define RECT_SHAPE
Definition: mpeg4video.h:33
VOP_STARTCODE
#define VOP_STARTCODE
Definition: mpeg4video.h:65
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
decode_vol_header
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:2150
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:2650
AV_EF_AGGRESSIVE
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2710
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:124
shift
static int shift(int a, int b)
Definition: sonic.c:82
INIT_VLC_RL
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
mpeg4_decode_dpcm_macroblock
static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
Definition: mpeg4videodec.c:1935
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
get_bitsz
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
Definition: get_bits.h:415
SLICE_START_CODE
#define SLICE_START_CODE
Definition: mpegvideo.h:75
overflow
Undefined Behavior In the C some operations are like signed integer overflow
Definition: undefined.txt:3
FF_BUG_XVID_ILACE
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2601
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
ff_h263_decode_frame
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:421
reset_studio_dc_predictors
static void reset_studio_dc_predictors(MpegEncContext *s)
Definition: mpeg4videodec.c:536
ff_mpeg4_c_dc_scale_table
const uint8_t ff_mpeg4_c_dc_scale_table[32]
Definition: mpeg4data.h:363
check_marker
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:612
ER_MV_END
#define ER_MV_END
Definition: error_resilience.h:36
QUANT_MATRIX_EXT_ID
#define QUANT_MATRIX_EXT_ID
Definition: mpeg4video.h:69
next_start_code_studio
static void next_start_code_studio(GetBitContext *gb)
Definition: mpeg4videodec.c:1781
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
alpha
static const int16_t alpha[]
Definition: ilbcdata.h:55
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1592
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:240
decode_studio_vop_header
static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode the next studio vop header.
Definition: mpeg4videodec.c:3059
mb_type_b_vlc
static VLC mb_type_b_vlc
Definition: mpeg4videodec.c:55
MB_TYPE_DIRECT2
#define MB_TYPE_DIRECT2
Definition: mpegutils.h:59
AV_CODEC_CAP_DRAW_HORIZ_BAND
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:975
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
MOTION_MARKER
#define MOTION_MARKER
Definition: mpeg4video.h:58
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
length
const char int length
Definition: avisynth_c.h:860
h
h
Definition: vp9dsp_template.c:2038
ff_mpeg4_studio_dc_luma
const uint16_t ff_mpeg4_studio_dc_luma[19][2]
Definition: mpeg4data.h:377
decode_new_pred
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb)
Definition: mpeg4videodec.c:431
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: mpeg4videodec.c:3512
FF_BUG_AMV
#define FF_BUG_AMV
Definition: avcodec.h:2604
sprite_trajectory
static VLC sprite_trajectory
Definition: mpeg4videodec.c:54
AV_PICTURE_TYPE_S
@ AV_PICTURE_TYPE_S
S(GMC)-VOP MPEG-4.
Definition: avutil.h:277
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:81
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
av_log2
int av_log2(unsigned v)
Definition: intmath.c:26
SIMPLE_VO_TYPE
#define SIMPLE_VO_TYPE
Definition: mpeg4video.h:38
HWACCEL_VDPAU
#define HWACCEL_VDPAU(codec)
Definition: hwaccel.h:75
RLTable::rl_vlc
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
IS_3IV1
#define IS_3IV1
Definition: mpeg4video.h:192
MB_TYPE_INTRA
#define MB_TYPE_INTRA
Definition: mpegutils.h:73
re
float re
Definition: fft.c:82
h263.h
min
float min
Definition: vorbis_enc_data.h:456
ff_h263_inter_MCBPC_vlc
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:99
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