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mpeg4videodec.c
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1 /*
2  * MPEG4 decoder.
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define UNCHECKED_BITSTREAM_READER 1
24 
25 #include "libavutil/opt.h"
26 #include "error_resilience.h"
27 #include "idctdsp.h"
28 #include "internal.h"
29 #include "mpegutils.h"
30 #include "mpegvideo.h"
31 #include "mpeg4video.h"
32 #include "h263.h"
33 #include "thread.h"
34 
35 /* The defines below define the number of bits that are read at once for
36  * reading vlc values. Changing these may improve speed and data cache needs
37  * be aware though that decreasing them may need the number of stages that is
38  * passed to get_vlc* to be increased. */
39 #define SPRITE_TRAJ_VLC_BITS 6
40 #define DC_VLC_BITS 9
41 #define MB_TYPE_B_VLC_BITS 4
42 
43 static VLC dc_lum, dc_chrom;
44 static VLC sprite_trajectory;
45 static VLC mb_type_b_vlc;
46 
47 static const int mb_type_b_map[4] = {
48  MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
49  MB_TYPE_L0L1 | MB_TYPE_16x16,
50  MB_TYPE_L1 | MB_TYPE_16x16,
51  MB_TYPE_L0 | MB_TYPE_16x16,
52 };
53 
54 /**
55  * Predict the ac.
56  * @param n block index (0-3 are luma, 4-5 are chroma)
57  * @param dir the ac prediction direction
58  */
59 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
60 {
61  int i;
62  int16_t *ac_val, *ac_val1;
63  int8_t *const qscale_table = s->current_picture.qscale_table;
64 
65  /* find prediction */
66  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
67  ac_val1 = ac_val;
68  if (s->ac_pred) {
69  if (dir == 0) {
70  const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
71  /* left prediction */
72  ac_val -= 16;
73 
74  if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
75  n == 1 || n == 3) {
76  /* same qscale */
77  for (i = 1; i < 8; i++)
78  block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
79  } else {
80  /* different qscale, we must rescale */
81  for (i = 1; i < 8; i++)
82  block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
83  }
84  } else {
85  const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
86  /* top prediction */
87  ac_val -= 16 * s->block_wrap[n];
88 
89  if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
90  n == 2 || n == 3) {
91  /* same qscale */
92  for (i = 1; i < 8; i++)
93  block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
94  } else {
95  /* different qscale, we must rescale */
96  for (i = 1; i < 8; i++)
97  block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
98  }
99  }
100  }
101  /* left copy */
102  for (i = 1; i < 8; i++)
103  ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
104 
105  /* top copy */
106  for (i = 1; i < 8; i++)
107  ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
108 }
109 
110 /**
111  * check if the next stuff is a resync marker or the end.
112  * @return 0 if not
113  */
114 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
115 {
116  MpegEncContext *s = &ctx->m;
117  int bits_count = get_bits_count(&s->gb);
118  int v = show_bits(&s->gb, 16);
119 
120  if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
121  return 0;
122 
123  while (v <= 0xFF) {
124  if (s->pict_type == AV_PICTURE_TYPE_B ||
125  (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
126  break;
127  skip_bits(&s->gb, 8 + s->pict_type);
128  bits_count += 8 + s->pict_type;
129  v = show_bits(&s->gb, 16);
130  }
131 
132  if (bits_count + 8 >= s->gb.size_in_bits) {
133  v >>= 8;
134  v |= 0x7F >> (7 - (bits_count & 7));
135 
136  if (v == 0x7F)
137  return s->mb_num;
138  } else {
139  if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
140  int len, mb_num;
141  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
142  GetBitContext gb = s->gb;
143 
144  skip_bits(&s->gb, 1);
145  align_get_bits(&s->gb);
146 
147  for (len = 0; len < 32; len++)
148  if (get_bits1(&s->gb))
149  break;
150 
151  mb_num = get_bits(&s->gb, mb_num_bits);
152  if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
153  mb_num= -1;
154 
155  s->gb = gb;
156 
157  if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
158  return mb_num;
159  }
160  }
161  return 0;
162 }
163 
164 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
165 {
166  MpegEncContext *s = &ctx->m;
167  int a = 2 << s->sprite_warping_accuracy;
168  int rho = 3 - s->sprite_warping_accuracy;
169  int r = 16 / a;
170  int alpha = 0;
171  int beta = 0;
172  int w = s->width;
173  int h = s->height;
174  int min_ab, i, w2, h2, w3, h3;
175  int sprite_ref[4][2];
176  int virtual_ref[2][2];
177 
178  // only true for rectangle shapes
179  const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
180  { 0, s->height }, { s->width, s->height } };
181  int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
182 
183  if (w <= 0 || h <= 0)
184  return AVERROR_INVALIDDATA;
185 
186  for (i = 0; i < ctx->num_sprite_warping_points; i++) {
187  int length;
188  int x = 0, y = 0;
189 
190  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
191  if (length)
192  x = get_xbits(gb, length);
193 
194  if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
195  skip_bits1(gb); /* marker bit */
196 
197  length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
198  if (length)
199  y = get_xbits(gb, length);
200 
201  skip_bits1(gb); /* marker bit */
202  ctx->sprite_traj[i][0] = d[i][0] = x;
203  ctx->sprite_traj[i][1] = d[i][1] = y;
204  }
205  for (; i < 4; i++)
206  ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
207 
208  while ((1 << alpha) < w)
209  alpha++;
210  while ((1 << beta) < h)
211  beta++; /* typo in the mpeg4 std for the definition of w' and h' */
212  w2 = 1 << alpha;
213  h2 = 1 << beta;
214 
215  // Note, the 4th point isn't used for GMC
216  if (ctx->divx_version == 500 && ctx->divx_build == 413) {
217  sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
218  sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
219  sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
220  sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
221  sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
222  sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
223  } else {
224  sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
225  sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
226  sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
227  sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
228  sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
229  sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
230  }
231  /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
232  * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
233 
234  /* this is mostly identical to the mpeg4 std (and is totally unreadable
235  * because of that...). Perhaps it should be reordered to be more readable.
236  * The idea behind this virtual_ref mess is to be able to use shifts later
237  * per pixel instead of divides so the distance between points is converted
238  * from w&h based to w2&h2 based which are of the 2^x form. */
239  virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
240  ROUNDED_DIV(((w - w2) *
241  (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
242  w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
243  virtual_ref[0][1] = 16 * vop_ref[0][1] +
244  ROUNDED_DIV(((w - w2) *
245  (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
246  w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
247  virtual_ref[1][0] = 16 * vop_ref[0][0] +
248  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
249  h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
250  virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
251  ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
252  h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
253 
254  switch (ctx->num_sprite_warping_points) {
255  case 0:
256  s->sprite_offset[0][0] =
257  s->sprite_offset[0][1] =
258  s->sprite_offset[1][0] =
259  s->sprite_offset[1][1] = 0;
260  s->sprite_delta[0][0] = a;
261  s->sprite_delta[0][1] =
262  s->sprite_delta[1][0] = 0;
263  s->sprite_delta[1][1] = a;
264  ctx->sprite_shift[0] =
265  ctx->sprite_shift[1] = 0;
266  break;
267  case 1: // GMC only
268  s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
269  s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
270  s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
271  a * (vop_ref[0][0] / 2);
272  s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
273  a * (vop_ref[0][1] / 2);
274  s->sprite_delta[0][0] = a;
275  s->sprite_delta[0][1] =
276  s->sprite_delta[1][0] = 0;
277  s->sprite_delta[1][1] = a;
278  ctx->sprite_shift[0] =
279  ctx->sprite_shift[1] = 0;
280  break;
281  case 2:
282  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
283  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
284  (-vop_ref[0][0]) +
285  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
286  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
287  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
288  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
289  (-vop_ref[0][0]) +
290  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
291  (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
292  s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
293  (-2 * vop_ref[0][0] + 1) +
294  (r * sprite_ref[0][1] - virtual_ref[0][1]) *
295  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
296  sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
297  s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
298  (-2 * vop_ref[0][0] + 1) +
299  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
300  (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
301  sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
302  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
303  s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
304  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
305  s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
306 
307  ctx->sprite_shift[0] = alpha + rho;
308  ctx->sprite_shift[1] = alpha + rho + 2;
309  break;
310  case 3:
311  min_ab = FFMIN(alpha, beta);
312  w3 = w2 >> min_ab;
313  h3 = h2 >> min_ab;
314  s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
315  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
316  h3 * (-vop_ref[0][0]) +
317  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
318  w3 * (-vop_ref[0][1]) +
319  (1 << (alpha + beta + rho - min_ab - 1));
320  s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
321  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
322  h3 * (-vop_ref[0][0]) +
323  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
324  w3 * (-vop_ref[0][1]) +
325  (1 << (alpha + beta + rho - min_ab - 1));
326  s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
327  h3 * (-2 * vop_ref[0][0] + 1) +
328  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
329  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
330  r * sprite_ref[0][0] - 16 * w2 * h3 +
331  (1 << (alpha + beta + rho - min_ab + 1));
332  s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
333  h3 * (-2 * vop_ref[0][0] + 1) +
334  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
335  w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
336  r * sprite_ref[0][1] - 16 * w2 * h3 +
337  (1 << (alpha + beta + rho - min_ab + 1));
338  s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
339  s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
340  s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
341  s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
342 
343  ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
344  ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
345  break;
346  }
347  /* try to simplify the situation */
348  if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
349  s->sprite_delta[0][1] == 0 &&
350  s->sprite_delta[1][0] == 0 &&
351  s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
352  s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
353  s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
354  s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
355  s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
356  s->sprite_delta[0][0] = a;
357  s->sprite_delta[0][1] = 0;
358  s->sprite_delta[1][0] = 0;
359  s->sprite_delta[1][1] = a;
360  ctx->sprite_shift[0] = 0;
361  ctx->sprite_shift[1] = 0;
362  s->real_sprite_warping_points = 1;
363  } else {
364  int shift_y = 16 - ctx->sprite_shift[0];
365  int shift_c = 16 - ctx->sprite_shift[1];
366  for (i = 0; i < 2; i++) {
367  s->sprite_offset[0][i] <<= shift_y;
368  s->sprite_offset[1][i] <<= shift_c;
369  s->sprite_delta[0][i] <<= shift_y;
370  s->sprite_delta[1][i] <<= shift_y;
371  ctx->sprite_shift[i] = 16;
372  }
373  s->real_sprite_warping_points = ctx->num_sprite_warping_points;
374  }
375 
376  return 0;
377 }
378 
379 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
380  int len = FFMIN(ctx->time_increment_bits + 3, 15);
381 
382  get_bits(gb, len);
383  if (get_bits1(gb))
384  get_bits(gb, len);
385  check_marker(gb, "after new_pred");
386 
387  return 0;
388 }
389 
390 /**
391  * Decode the next video packet.
392  * @return <0 if something went wrong
393  */
394 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
395 {
396  MpegEncContext *s = &ctx->m;
397 
398  int mb_num_bits = av_log2(s->mb_num - 1) + 1;
399  int header_extension = 0, mb_num, len;
400 
401  /* is there enough space left for a video packet + header */
402  if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
403  return -1;
404 
405  for (len = 0; len < 32; len++)
406  if (get_bits1(&s->gb))
407  break;
408 
409  if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
410  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
411  return -1;
412  }
413 
414  if (ctx->shape != RECT_SHAPE) {
415  header_extension = get_bits1(&s->gb);
416  // FIXME more stuff here
417  }
418 
419  mb_num = get_bits(&s->gb, mb_num_bits);
420  if (mb_num >= s->mb_num) {
421  av_log(s->avctx, AV_LOG_ERROR,
422  "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
423  return -1;
424  }
425 
426  s->mb_x = mb_num % s->mb_width;
427  s->mb_y = mb_num / s->mb_width;
428 
429  if (ctx->shape != BIN_ONLY_SHAPE) {
430  int qscale = get_bits(&s->gb, s->quant_precision);
431  if (qscale)
432  s->chroma_qscale = s->qscale = qscale;
433  }
434 
435  if (ctx->shape == RECT_SHAPE)
436  header_extension = get_bits1(&s->gb);
437 
438  if (header_extension) {
439  int time_incr = 0;
440 
441  while (get_bits1(&s->gb) != 0)
442  time_incr++;
443 
444  check_marker(&s->gb, "before time_increment in video packed header");
445  skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
446  check_marker(&s->gb, "before vop_coding_type in video packed header");
447 
448  skip_bits(&s->gb, 2); /* vop coding type */
449  // FIXME not rect stuff here
450 
451  if (ctx->shape != BIN_ONLY_SHAPE) {
452  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
453  // FIXME don't just ignore everything
454  if (s->pict_type == AV_PICTURE_TYPE_S &&
455  ctx->vol_sprite_usage == GMC_SPRITE) {
456  if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
457  return AVERROR_INVALIDDATA;
458  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
459  }
460 
461  // FIXME reduced res stuff here
462 
463  if (s->pict_type != AV_PICTURE_TYPE_I) {
464  int f_code = get_bits(&s->gb, 3); /* fcode_for */
465  if (f_code == 0)
466  av_log(s->avctx, AV_LOG_ERROR,
467  "Error, video packet header damaged (f_code=0)\n");
468  }
469  if (s->pict_type == AV_PICTURE_TYPE_B) {
470  int b_code = get_bits(&s->gb, 3);
471  if (b_code == 0)
472  av_log(s->avctx, AV_LOG_ERROR,
473  "Error, video packet header damaged (b_code=0)\n");
474  }
475  }
476  }
477  if (ctx->new_pred)
478  decode_new_pred(ctx, &s->gb);
479 
480  return 0;
481 }
482 
483 /**
484  * Get the average motion vector for a GMC MB.
485  * @param n either 0 for the x component or 1 for y
486  * @return the average MV for a GMC MB
487  */
488 static inline int get_amv(Mpeg4DecContext *ctx, int n)
489 {
490  MpegEncContext *s = &ctx->m;
491  int x, y, mb_v, sum, dx, dy, shift;
492  int len = 1 << (s->f_code + 4);
493  const int a = s->sprite_warping_accuracy;
494 
495  if (s->workaround_bugs & FF_BUG_AMV)
496  len >>= s->quarter_sample;
497 
498  if (s->real_sprite_warping_points == 1) {
499  if (ctx->divx_version == 500 && ctx->divx_build == 413)
500  sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
501  else
502  sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
503  } else {
504  dx = s->sprite_delta[n][0];
505  dy = s->sprite_delta[n][1];
506  shift = ctx->sprite_shift[0];
507  if (n)
508  dy -= 1 << (shift + a + 1);
509  else
510  dx -= 1 << (shift + a + 1);
511  mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
512 
513  sum = 0;
514  for (y = 0; y < 16; y++) {
515  int v;
516 
517  v = mb_v + dy * y;
518  // FIXME optimize
519  for (x = 0; x < 16; x++) {
520  sum += v >> shift;
521  v += dx;
522  }
523  }
524  sum = RSHIFT(sum, a + 8 - s->quarter_sample);
525  }
526 
527  if (sum < -len)
528  sum = -len;
529  else if (sum >= len)
530  sum = len - 1;
531 
532  return sum;
533 }
534 
535 /**
536  * Decode the dc value.
537  * @param n block index (0-3 are luma, 4-5 are chroma)
538  * @param dir_ptr the prediction direction will be stored here
539  * @return the quantized dc
540  */
541 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
542 {
543  int level, code;
544 
545  if (n < 4)
546  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
547  else
548  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
549 
550  if (code < 0 || code > 9 /* && s->nbit < 9 */) {
551  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
552  return -1;
553  }
554 
555  if (code == 0) {
556  level = 0;
557  } else {
558  if (IS_3IV1) {
559  if (code == 1)
560  level = 2 * get_bits1(&s->gb) - 1;
561  else {
562  if (get_bits1(&s->gb))
563  level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
564  else
565  level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
566  }
567  } else {
568  level = get_xbits(&s->gb, code);
569  }
570 
571  if (code > 8) {
572  if (get_bits1(&s->gb) == 0) { /* marker */
573  if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
574  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
575  return -1;
576  }
577  }
578  }
579  }
580 
581  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
582 }
583 
584 /**
585  * Decode first partition.
586  * @return number of MBs decoded or <0 if an error occurred
587  */
588 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
589 {
590  MpegEncContext *s = &ctx->m;
591  int mb_num = 0;
592  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
593 
594  /* decode first partition */
595  s->first_slice_line = 1;
596  for (; s->mb_y < s->mb_height; s->mb_y++) {
597  ff_init_block_index(s);
598  for (; s->mb_x < s->mb_width; s->mb_x++) {
599  const int xy = s->mb_x + s->mb_y * s->mb_stride;
600  int cbpc;
601  int dir = 0;
602 
603  mb_num++;
604  ff_update_block_index(s);
605  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
606  s->first_slice_line = 0;
607 
608  if (s->pict_type == AV_PICTURE_TYPE_I) {
609  int i;
610 
611  do {
612  if (show_bits_long(&s->gb, 19) == DC_MARKER)
613  return mb_num - 1;
614 
615  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
616  if (cbpc < 0) {
617  av_log(s->avctx, AV_LOG_ERROR,
618  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
619  return -1;
620  }
621  } while (cbpc == 8);
622 
623  s->cbp_table[xy] = cbpc & 3;
624  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
625  s->mb_intra = 1;
626 
627  if (cbpc & 4)
628  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
629 
630  s->current_picture.qscale_table[xy] = s->qscale;
631 
632  s->mbintra_table[xy] = 1;
633  for (i = 0; i < 6; i++) {
634  int dc_pred_dir;
635  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
636  if (dc < 0) {
637  av_log(s->avctx, AV_LOG_ERROR,
638  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
639  return -1;
640  }
641  dir <<= 1;
642  if (dc_pred_dir)
643  dir |= 1;
644  }
645  s->pred_dir_table[xy] = dir;
646  } else { /* P/S_TYPE */
647  int mx, my, pred_x, pred_y, bits;
648  int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
649  const int stride = s->b8_stride * 2;
650 
651 try_again:
652  bits = show_bits(&s->gb, 17);
653  if (bits == MOTION_MARKER)
654  return mb_num - 1;
655 
656  skip_bits1(&s->gb);
657  if (bits & 0x10000) {
658  /* skip mb */
659  if (s->pict_type == AV_PICTURE_TYPE_S &&
660  ctx->vol_sprite_usage == GMC_SPRITE) {
661  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
662  MB_TYPE_16x16 |
663  MB_TYPE_GMC |
664  MB_TYPE_L0;
665  mx = get_amv(ctx, 0);
666  my = get_amv(ctx, 1);
667  } else {
668  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
669  MB_TYPE_16x16 |
670  MB_TYPE_L0;
671  mx = my = 0;
672  }
673  mot_val[0] =
674  mot_val[2] =
675  mot_val[0 + stride] =
676  mot_val[2 + stride] = mx;
677  mot_val[1] =
678  mot_val[3] =
679  mot_val[1 + stride] =
680  mot_val[3 + stride] = my;
681 
682  if (s->mbintra_table[xy])
683  ff_clean_intra_table_entries(s);
684  continue;
685  }
686 
687  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
688  if (cbpc < 0) {
689  av_log(s->avctx, AV_LOG_ERROR,
690  "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
691  return -1;
692  }
693  if (cbpc == 20)
694  goto try_again;
695 
696  s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
697 
698  s->mb_intra = ((cbpc & 4) != 0);
699 
700  if (s->mb_intra) {
701  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
702  s->mbintra_table[xy] = 1;
703  mot_val[0] =
704  mot_val[2] =
705  mot_val[0 + stride] =
706  mot_val[2 + stride] = 0;
707  mot_val[1] =
708  mot_val[3] =
709  mot_val[1 + stride] =
710  mot_val[3 + stride] = 0;
711  } else {
712  if (s->mbintra_table[xy])
713  ff_clean_intra_table_entries(s);
714 
715  if (s->pict_type == AV_PICTURE_TYPE_S &&
716  ctx->vol_sprite_usage == GMC_SPRITE &&
717  (cbpc & 16) == 0)
718  s->mcsel = get_bits1(&s->gb);
719  else
720  s->mcsel = 0;
721 
722  if ((cbpc & 16) == 0) {
723  /* 16x16 motion prediction */
724 
725  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
726  if (!s->mcsel) {
727  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
728  if (mx >= 0xffff)
729  return -1;
730 
731  my = ff_h263_decode_motion(s, pred_y, s->f_code);
732  if (my >= 0xffff)
733  return -1;
734  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
735  MB_TYPE_L0;
736  } else {
737  mx = get_amv(ctx, 0);
738  my = get_amv(ctx, 1);
739  s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
740  MB_TYPE_GMC |
741  MB_TYPE_L0;
742  }
743 
744  mot_val[0] =
745  mot_val[2] =
746  mot_val[0 + stride] =
747  mot_val[2 + stride] = mx;
748  mot_val[1] =
749  mot_val[3] =
750  mot_val[1 + stride] =
751  mot_val[3 + stride] = my;
752  } else {
753  int i;
754  s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
755  MB_TYPE_L0;
756  for (i = 0; i < 4; i++) {
757  int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
758  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
759  if (mx >= 0xffff)
760  return -1;
761 
762  my = ff_h263_decode_motion(s, pred_y, s->f_code);
763  if (my >= 0xffff)
764  return -1;
765  mot_val[0] = mx;
766  mot_val[1] = my;
767  }
768  }
769  }
770  }
771  }
772  s->mb_x = 0;
773  }
774 
775  return mb_num;
776 }
777 
778 /**
779  * decode second partition.
780  * @return <0 if an error occurred
781  */
782 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
783 {
784  int mb_num = 0;
785  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
786 
787  s->mb_x = s->resync_mb_x;
788  s->first_slice_line = 1;
789  for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
790  ff_init_block_index(s);
791  for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
792  const int xy = s->mb_x + s->mb_y * s->mb_stride;
793 
794  mb_num++;
795  ff_update_block_index(s);
796  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
797  s->first_slice_line = 0;
798 
799  if (s->pict_type == AV_PICTURE_TYPE_I) {
800  int ac_pred = get_bits1(&s->gb);
801  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
802  if (cbpy < 0) {
803  av_log(s->avctx, AV_LOG_ERROR,
804  "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
805  return -1;
806  }
807 
808  s->cbp_table[xy] |= cbpy << 2;
809  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
810  } else { /* P || S_TYPE */
811  if (IS_INTRA(s->current_picture.mb_type[xy])) {
812  int i;
813  int dir = 0;
814  int ac_pred = get_bits1(&s->gb);
815  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
816 
817  if (cbpy < 0) {
818  av_log(s->avctx, AV_LOG_ERROR,
819  "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
820  return -1;
821  }
822 
823  if (s->cbp_table[xy] & 8)
824  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
825  s->current_picture.qscale_table[xy] = s->qscale;
826 
827  for (i = 0; i < 6; i++) {
828  int dc_pred_dir;
829  int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
830  if (dc < 0) {
831  av_log(s->avctx, AV_LOG_ERROR,
832  "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
833  return -1;
834  }
835  dir <<= 1;
836  if (dc_pred_dir)
837  dir |= 1;
838  }
839  s->cbp_table[xy] &= 3; // remove dquant
840  s->cbp_table[xy] |= cbpy << 2;
841  s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
842  s->pred_dir_table[xy] = dir;
843  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
844  s->current_picture.qscale_table[xy] = s->qscale;
845  s->cbp_table[xy] = 0;
846  } else {
847  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
848 
849  if (cbpy < 0) {
850  av_log(s->avctx, AV_LOG_ERROR,
851  "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
852  return -1;
853  }
854 
855  if (s->cbp_table[xy] & 8)
856  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
857  s->current_picture.qscale_table[xy] = s->qscale;
858 
859  s->cbp_table[xy] &= 3; // remove dquant
860  s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
861  }
862  }
863  }
864  if (mb_num >= mb_count)
865  return 0;
866  s->mb_x = 0;
867  }
868  return 0;
869 }
870 
871 /**
872  * Decode the first and second partition.
873  * @return <0 if error (and sets error type in the error_status_table)
874  */
875 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
876 {
877  MpegEncContext *s = &ctx->m;
878  int mb_num;
879  const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
880  const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
881 
882  mb_num = mpeg4_decode_partition_a(ctx);
883  if (mb_num < 0) {
884  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
885  s->mb_x, s->mb_y, part_a_error);
886  return -1;
887  }
888 
889  if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
890  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
891  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
892  s->mb_x, s->mb_y, part_a_error);
893  return -1;
894  }
895 
896  s->mb_num_left = mb_num;
897 
898  if (s->pict_type == AV_PICTURE_TYPE_I) {
899  while (show_bits(&s->gb, 9) == 1)
900  skip_bits(&s->gb, 9);
901  if (get_bits_long(&s->gb, 19) != DC_MARKER) {
902  av_log(s->avctx, AV_LOG_ERROR,
903  "marker missing after first I partition at %d %d\n",
904  s->mb_x, s->mb_y);
905  return -1;
906  }
907  } else {
908  while (show_bits(&s->gb, 10) == 1)
909  skip_bits(&s->gb, 10);
910  if (get_bits(&s->gb, 17) != MOTION_MARKER) {
911  av_log(s->avctx, AV_LOG_ERROR,
912  "marker missing after first P partition at %d %d\n",
913  s->mb_x, s->mb_y);
914  return -1;
915  }
916  }
917  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
918  s->mb_x - 1, s->mb_y, part_a_end);
919 
920  if (mpeg4_decode_partition_b(s, mb_num) < 0) {
921  if (s->pict_type == AV_PICTURE_TYPE_P)
922  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
923  s->mb_x, s->mb_y, ER_DC_ERROR);
924  return -1;
925  } else {
926  if (s->pict_type == AV_PICTURE_TYPE_P)
927  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
928  s->mb_x - 1, s->mb_y, ER_DC_END);
929  }
930 
931  return 0;
932 }
933 
934 /**
935  * Decode a block.
936  * @return <0 if an error occurred
937  */
938 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
939  int n, int coded, int intra, int rvlc)
940 {
941  MpegEncContext *s = &ctx->m;
942  int level, i, last, run, qmul, qadd;
943  int av_uninit(dc_pred_dir);
944  RLTable *rl;
945  RL_VLC_ELEM *rl_vlc;
946  const uint8_t *scan_table;
947 
948  // Note intra & rvlc should be optimized away if this is inlined
949 
950  if (intra) {
951  if (ctx->use_intra_dc_vlc) {
952  /* DC coef */
953  if (s->partitioned_frame) {
954  level = s->dc_val[0][s->block_index[n]];
955  if (n < 4)
956  level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
957  else
958  level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
959  dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
960  } else {
961  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
962  if (level < 0)
963  return -1;
964  }
965  block[0] = level;
966  i = 0;
967  } else {
968  i = -1;
969  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
970  }
971  if (!coded)
972  goto not_coded;
973 
974  if (rvlc) {
975  rl = &ff_rvlc_rl_intra;
976  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
977  } else {
978  rl = &ff_mpeg4_rl_intra;
979  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
980  }
981  if (s->ac_pred) {
982  if (dc_pred_dir == 0)
983  scan_table = s->intra_v_scantable.permutated; /* left */
984  else
985  scan_table = s->intra_h_scantable.permutated; /* top */
986  } else {
987  scan_table = s->intra_scantable.permutated;
988  }
989  qmul = 1;
990  qadd = 0;
991  } else {
992  i = -1;
993  if (!coded) {
994  s->block_last_index[n] = i;
995  return 0;
996  }
997  if (rvlc)
998  rl = &ff_rvlc_rl_inter;
999  else
1000  rl = &ff_h263_rl_inter;
1001 
1002  scan_table = s->intra_scantable.permutated;
1003 
1004  if (s->mpeg_quant) {
1005  qmul = 1;
1006  qadd = 0;
1007  if (rvlc)
1008  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1009  else
1010  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1011  } else {
1012  qmul = s->qscale << 1;
1013  qadd = (s->qscale - 1) | 1;
1014  if (rvlc)
1015  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1016  else
1017  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1018  }
1019  }
1020  {
1021  OPEN_READER(re, &s->gb);
1022  for (;;) {
1023  UPDATE_CACHE(re, &s->gb);
1024  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1025  if (level == 0) {
1026  /* escape */
1027  if (rvlc) {
1028  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1029  av_log(s->avctx, AV_LOG_ERROR,
1030  "1. marker bit missing in rvlc esc\n");
1031  return -1;
1032  }
1033  SKIP_CACHE(re, &s->gb, 1);
1034 
1035  last = SHOW_UBITS(re, &s->gb, 1);
1036  SKIP_CACHE(re, &s->gb, 1);
1037  run = SHOW_UBITS(re, &s->gb, 6);
1038  SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1039  UPDATE_CACHE(re, &s->gb);
1040 
1041  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1042  av_log(s->avctx, AV_LOG_ERROR,
1043  "2. marker bit missing in rvlc esc\n");
1044  return -1;
1045  }
1046  SKIP_CACHE(re, &s->gb, 1);
1047 
1048  level = SHOW_UBITS(re, &s->gb, 11);
1049  SKIP_CACHE(re, &s->gb, 11);
1050 
1051  if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1052  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1053  return -1;
1054  }
1055  SKIP_CACHE(re, &s->gb, 5);
1056 
1057  level = level * qmul + qadd;
1058  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1059  SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1060 
1061  i += run + 1;
1062  if (last)
1063  i += 192;
1064  } else {
1065  int cache;
1066  cache = GET_CACHE(re, &s->gb);
1067 
1068  if (IS_3IV1)
1069  cache ^= 0xC0000000;
1070 
1071  if (cache & 0x80000000) {
1072  if (cache & 0x40000000) {
1073  /* third escape */
1074  SKIP_CACHE(re, &s->gb, 2);
1075  last = SHOW_UBITS(re, &s->gb, 1);
1076  SKIP_CACHE(re, &s->gb, 1);
1077  run = SHOW_UBITS(re, &s->gb, 6);
1078  SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1079  UPDATE_CACHE(re, &s->gb);
1080 
1081  if (IS_3IV1) {
1082  level = SHOW_SBITS(re, &s->gb, 12);
1083  LAST_SKIP_BITS(re, &s->gb, 12);
1084  } else {
1085  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1086  av_log(s->avctx, AV_LOG_ERROR,
1087  "1. marker bit missing in 3. esc\n");
1088  if (!(s->err_recognition & AV_EF_IGNORE_ERR))
1089  return -1;
1090  }
1091  SKIP_CACHE(re, &s->gb, 1);
1092 
1093  level = SHOW_SBITS(re, &s->gb, 12);
1094  SKIP_CACHE(re, &s->gb, 12);
1095 
1096  if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1097  av_log(s->avctx, AV_LOG_ERROR,
1098  "2. marker bit missing in 3. esc\n");
1099  if (!(s->err_recognition & AV_EF_IGNORE_ERR))
1100  return -1;
1101  }
1102 
1103  SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1104  }
1105 
1106 #if 0
1107  if (s->error_recognition >= FF_ER_COMPLIANT) {
1108  const int abs_level= FFABS(level);
1109  if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1110  const int run1= run - rl->max_run[last][abs_level] - 1;
1111  if (abs_level <= rl->max_level[last][run]) {
1112  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1113  return -1;
1114  }
1115  if (s->error_recognition > FF_ER_COMPLIANT) {
1116  if (abs_level <= rl->max_level[last][run]*2) {
1117  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1118  return -1;
1119  }
1120  if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1121  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1122  return -1;
1123  }
1124  }
1125  }
1126  }
1127 #endif
1128  if (level > 0)
1129  level = level * qmul + qadd;
1130  else
1131  level = level * qmul - qadd;
1132 
1133  if ((unsigned)(level + 2048) > 4095) {
1134  if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1135  if (level > 2560 || level < -2560) {
1136  av_log(s->avctx, AV_LOG_ERROR,
1137  "|level| overflow in 3. esc, qp=%d\n",
1138  s->qscale);
1139  return -1;
1140  }
1141  }
1142  level = level < 0 ? -2048 : 2047;
1143  }
1144 
1145  i += run + 1;
1146  if (last)
1147  i += 192;
1148  } else {
1149  /* second escape */
1150  SKIP_BITS(re, &s->gb, 2);
1151  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1152  i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1153  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1154  LAST_SKIP_BITS(re, &s->gb, 1);
1155  }
1156  } else {
1157  /* first escape */
1158  SKIP_BITS(re, &s->gb, 1);
1159  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1160  i += run;
1161  level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1162  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1163  LAST_SKIP_BITS(re, &s->gb, 1);
1164  }
1165  }
1166  } else {
1167  i += run;
1168  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1169  LAST_SKIP_BITS(re, &s->gb, 1);
1170  }
1171  tprintf(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1172  if (i > 62) {
1173  i -= 192;
1174  if (i & (~63)) {
1175  av_log(s->avctx, AV_LOG_ERROR,
1176  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1177  return -1;
1178  }
1179 
1180  block[scan_table[i]] = level;
1181  break;
1182  }
1183 
1184  block[scan_table[i]] = level;
1185  }
1186  CLOSE_READER(re, &s->gb);
1187  }
1188 
1189 not_coded:
1190  if (intra) {
1191  if (!ctx->use_intra_dc_vlc) {
1192  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1193 
1194  i -= i >> 31; // if (i == -1) i = 0;
1195  }
1196 
1197  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1198  if (s->ac_pred)
1199  i = 63; // FIXME not optimal
1200  }
1201  s->block_last_index[n] = i;
1202  return 0;
1203 }
1204 
1205 /**
1206  * decode partition C of one MB.
1207  * @return <0 if an error occurred
1208  */
1209 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1210 {
1211  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1212  int cbp, mb_type;
1213  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1214 
1215  mb_type = s->current_picture.mb_type[xy];
1216  cbp = s->cbp_table[xy];
1217 
1218  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1219 
1220  if (s->current_picture.qscale_table[xy] != s->qscale)
1221  ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1222 
1223  if (s->pict_type == AV_PICTURE_TYPE_P ||
1224  s->pict_type == AV_PICTURE_TYPE_S) {
1225  int i;
1226  for (i = 0; i < 4; i++) {
1227  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1228  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1229  }
1230  s->mb_intra = IS_INTRA(mb_type);
1231 
1232  if (IS_SKIP(mb_type)) {
1233  /* skip mb */
1234  for (i = 0; i < 6; i++)
1235  s->block_last_index[i] = -1;
1236  s->mv_dir = MV_DIR_FORWARD;
1237  s->mv_type = MV_TYPE_16X16;
1238  if (s->pict_type == AV_PICTURE_TYPE_S
1239  && ctx->vol_sprite_usage == GMC_SPRITE) {
1240  s->mcsel = 1;
1241  s->mb_skipped = 0;
1242  } else {
1243  s->mcsel = 0;
1244  s->mb_skipped = 1;
1245  }
1246  } else if (s->mb_intra) {
1247  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1248  } else if (!s->mb_intra) {
1249  // s->mcsel = 0; // FIXME do we need to init that?
1250 
1251  s->mv_dir = MV_DIR_FORWARD;
1252  if (IS_8X8(mb_type)) {
1253  s->mv_type = MV_TYPE_8X8;
1254  } else {
1255  s->mv_type = MV_TYPE_16X16;
1256  }
1257  }
1258  } else { /* I-Frame */
1259  s->mb_intra = 1;
1260  s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1261  }
1262 
1263  if (!IS_SKIP(mb_type)) {
1264  int i;
1265  s->bdsp.clear_blocks(s->block[0]);
1266  /* decode each block */
1267  for (i = 0; i < 6; i++) {
1268  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1269  av_log(s->avctx, AV_LOG_ERROR,
1270  "texture corrupted at %d %d %d\n",
1271  s->mb_x, s->mb_y, s->mb_intra);
1272  return -1;
1273  }
1274  cbp += cbp;
1275  }
1276  }
1277 
1278  /* per-MB end of slice check */
1279  if (--s->mb_num_left <= 0) {
1280  if (mpeg4_is_resync(ctx))
1281  return SLICE_END;
1282  else
1283  return SLICE_NOEND;
1284  } else {
1285  if (mpeg4_is_resync(ctx)) {
1286  const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1287  if (s->cbp_table[xy + delta])
1288  return SLICE_END;
1289  }
1290  return SLICE_OK;
1291  }
1292 }
1293 
1294 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1295 {
1296  Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1297  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1298  int16_t *mot_val;
1299  static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1300  const int xy = s->mb_x + s->mb_y * s->mb_stride;
1301 
1302  av_assert2(s->h263_pred);
1303 
1304  if (s->pict_type == AV_PICTURE_TYPE_P ||
1305  s->pict_type == AV_PICTURE_TYPE_S) {
1306  do {
1307  if (get_bits1(&s->gb)) {
1308  /* skip mb */
1309  s->mb_intra = 0;
1310  for (i = 0; i < 6; i++)
1311  s->block_last_index[i] = -1;
1312  s->mv_dir = MV_DIR_FORWARD;
1313  s->mv_type = MV_TYPE_16X16;
1314  if (s->pict_type == AV_PICTURE_TYPE_S &&
1315  ctx->vol_sprite_usage == GMC_SPRITE) {
1316  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1317  MB_TYPE_GMC |
1318  MB_TYPE_16x16 |
1319  MB_TYPE_L0;
1320  s->mcsel = 1;
1321  s->mv[0][0][0] = get_amv(ctx, 0);
1322  s->mv[0][0][1] = get_amv(ctx, 1);
1323  s->mb_skipped = 0;
1324  } else {
1325  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1326  MB_TYPE_16x16 |
1327  MB_TYPE_L0;
1328  s->mcsel = 0;
1329  s->mv[0][0][0] = 0;
1330  s->mv[0][0][1] = 0;
1331  s->mb_skipped = 1;
1332  }
1333  goto end;
1334  }
1335  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1336  if (cbpc < 0) {
1337  av_log(s->avctx, AV_LOG_ERROR,
1338  "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1339  return -1;
1340  }
1341  } while (cbpc == 20);
1342 
1343  s->bdsp.clear_blocks(s->block[0]);
1344  dquant = cbpc & 8;
1345  s->mb_intra = ((cbpc & 4) != 0);
1346  if (s->mb_intra)
1347  goto intra;
1348 
1349  if (s->pict_type == AV_PICTURE_TYPE_S &&
1350  ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1351  s->mcsel = get_bits1(&s->gb);
1352  else
1353  s->mcsel = 0;
1354  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1355 
1356  cbp = (cbpc & 3) | (cbpy << 2);
1357  if (dquant)
1358  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1359  if ((!s->progressive_sequence) &&
1360  (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1361  s->interlaced_dct = get_bits1(&s->gb);
1362 
1363  s->mv_dir = MV_DIR_FORWARD;
1364  if ((cbpc & 16) == 0) {
1365  if (s->mcsel) {
1366  s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1367  MB_TYPE_16x16 |
1368  MB_TYPE_L0;
1369  /* 16x16 global motion prediction */
1370  s->mv_type = MV_TYPE_16X16;
1371  mx = get_amv(ctx, 0);
1372  my = get_amv(ctx, 1);
1373  s->mv[0][0][0] = mx;
1374  s->mv[0][0][1] = my;
1375  } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1376  s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1377  MB_TYPE_L0 |
1378  MB_TYPE_INTERLACED;
1379  /* 16x8 field motion prediction */
1380  s->mv_type = MV_TYPE_FIELD;
1381 
1382  s->field_select[0][0] = get_bits1(&s->gb);
1383  s->field_select[0][1] = get_bits1(&s->gb);
1384 
1385  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1386 
1387  for (i = 0; i < 2; i++) {
1388  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1389  if (mx >= 0xffff)
1390  return -1;
1391 
1392  my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1393  if (my >= 0xffff)
1394  return -1;
1395 
1396  s->mv[0][i][0] = mx;
1397  s->mv[0][i][1] = my;
1398  }
1399  } else {
1400  s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1401  /* 16x16 motion prediction */
1402  s->mv_type = MV_TYPE_16X16;
1403  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1404  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1405 
1406  if (mx >= 0xffff)
1407  return -1;
1408 
1409  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1410 
1411  if (my >= 0xffff)
1412  return -1;
1413  s->mv[0][0][0] = mx;
1414  s->mv[0][0][1] = my;
1415  }
1416  } else {
1417  s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1418  s->mv_type = MV_TYPE_8X8;
1419  for (i = 0; i < 4; i++) {
1420  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1421  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1422  if (mx >= 0xffff)
1423  return -1;
1424 
1425  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1426  if (my >= 0xffff)
1427  return -1;
1428  s->mv[0][i][0] = mx;
1429  s->mv[0][i][1] = my;
1430  mot_val[0] = mx;
1431  mot_val[1] = my;
1432  }
1433  }
1434  } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1435  int modb1; // first bit of modb
1436  int modb2; // second bit of modb
1437  int mb_type;
1438 
1439  s->mb_intra = 0; // B-frames never contain intra blocks
1440  s->mcsel = 0; // ... true gmc blocks
1441 
1442  if (s->mb_x == 0) {
1443  for (i = 0; i < 2; i++) {
1444  s->last_mv[i][0][0] =
1445  s->last_mv[i][0][1] =
1446  s->last_mv[i][1][0] =
1447  s->last_mv[i][1][1] = 0;
1448  }
1449 
1450  ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1451  }
1452 
1453  /* if we skipped it in the future P Frame than skip it now too */
1454  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1455 
1456  if (s->mb_skipped) {
1457  /* skip mb */
1458  for (i = 0; i < 6; i++)
1459  s->block_last_index[i] = -1;
1460 
1461  s->mv_dir = MV_DIR_FORWARD;
1462  s->mv_type = MV_TYPE_16X16;
1463  s->mv[0][0][0] =
1464  s->mv[0][0][1] =
1465  s->mv[1][0][0] =
1466  s->mv[1][0][1] = 0;
1467  s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1468  MB_TYPE_16x16 |
1469  MB_TYPE_L0;
1470  goto end;
1471  }
1472 
1473  modb1 = get_bits1(&s->gb);
1474  if (modb1) {
1475  // like MB_TYPE_B_DIRECT but no vectors coded
1476  mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1477  cbp = 0;
1478  } else {
1479  modb2 = get_bits1(&s->gb);
1480  mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1481  if (mb_type < 0) {
1482  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1483  return -1;
1484  }
1485  mb_type = mb_type_b_map[mb_type];
1486  if (modb2) {
1487  cbp = 0;
1488  } else {
1489  s->bdsp.clear_blocks(s->block[0]);
1490  cbp = get_bits(&s->gb, 6);
1491  }
1492 
1493  if ((!IS_DIRECT(mb_type)) && cbp) {
1494  if (get_bits1(&s->gb))
1495  ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1496  }
1497 
1498  if (!s->progressive_sequence) {
1499  if (cbp)
1500  s->interlaced_dct = get_bits1(&s->gb);
1501 
1502  if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1503  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1504  mb_type &= ~MB_TYPE_16x16;
1505 
1506  if (USES_LIST(mb_type, 0)) {
1507  s->field_select[0][0] = get_bits1(&s->gb);
1508  s->field_select[0][1] = get_bits1(&s->gb);
1509  }
1510  if (USES_LIST(mb_type, 1)) {
1511  s->field_select[1][0] = get_bits1(&s->gb);
1512  s->field_select[1][1] = get_bits1(&s->gb);
1513  }
1514  }
1515  }
1516 
1517  s->mv_dir = 0;
1518  if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1519  s->mv_type = MV_TYPE_16X16;
1520 
1521  if (USES_LIST(mb_type, 0)) {
1522  s->mv_dir = MV_DIR_FORWARD;
1523 
1524  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1525  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1526  s->last_mv[0][1][0] =
1527  s->last_mv[0][0][0] =
1528  s->mv[0][0][0] = mx;
1529  s->last_mv[0][1][1] =
1530  s->last_mv[0][0][1] =
1531  s->mv[0][0][1] = my;
1532  }
1533 
1534  if (USES_LIST(mb_type, 1)) {
1535  s->mv_dir |= MV_DIR_BACKWARD;
1536 
1537  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1538  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1539  s->last_mv[1][1][0] =
1540  s->last_mv[1][0][0] =
1541  s->mv[1][0][0] = mx;
1542  s->last_mv[1][1][1] =
1543  s->last_mv[1][0][1] =
1544  s->mv[1][0][1] = my;
1545  }
1546  } else if (!IS_DIRECT(mb_type)) {
1547  s->mv_type = MV_TYPE_FIELD;
1548 
1549  if (USES_LIST(mb_type, 0)) {
1550  s->mv_dir = MV_DIR_FORWARD;
1551 
1552  for (i = 0; i < 2; i++) {
1553  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1554  my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1555  s->last_mv[0][i][0] =
1556  s->mv[0][i][0] = mx;
1557  s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1558  }
1559  }
1560 
1561  if (USES_LIST(mb_type, 1)) {
1562  s->mv_dir |= MV_DIR_BACKWARD;
1563 
1564  for (i = 0; i < 2; i++) {
1565  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1566  my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1567  s->last_mv[1][i][0] =
1568  s->mv[1][i][0] = mx;
1569  s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1570  }
1571  }
1572  }
1573  }
1574 
1575  if (IS_DIRECT(mb_type)) {
1576  if (IS_SKIP(mb_type)) {
1577  mx =
1578  my = 0;
1579  } else {
1580  mx = ff_h263_decode_motion(s, 0, 1);
1581  my = ff_h263_decode_motion(s, 0, 1);
1582  }
1583 
1584  s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1585  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1586  }
1587  s->current_picture.mb_type[xy] = mb_type;
1588  } else { /* I-Frame */
1589  do {
1590  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1591  if (cbpc < 0) {
1592  av_log(s->avctx, AV_LOG_ERROR,
1593  "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1594  return -1;
1595  }
1596  } while (cbpc == 8);
1597 
1598  dquant = cbpc & 4;
1599  s->mb_intra = 1;
1600 
1601 intra:
1602  s->ac_pred = get_bits1(&s->gb);
1603  if (s->ac_pred)
1604  s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1605  else
1606  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1607 
1608  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1609  if (cbpy < 0) {
1610  av_log(s->avctx, AV_LOG_ERROR,
1611  "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1612  return -1;
1613  }
1614  cbp = (cbpc & 3) | (cbpy << 2);
1615 
1616  ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1617 
1618  if (dquant)
1619  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1620 
1621  if (!s->progressive_sequence)
1622  s->interlaced_dct = get_bits1(&s->gb);
1623 
1624  s->bdsp.clear_blocks(s->block[0]);
1625  /* decode each block */
1626  for (i = 0; i < 6; i++) {
1627  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1628  return -1;
1629  cbp += cbp;
1630  }
1631  goto end;
1632  }
1633 
1634  /* decode each block */
1635  for (i = 0; i < 6; i++) {
1636  if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1637  return -1;
1638  cbp += cbp;
1639  }
1640 
1641 end:
1642  /* per-MB end of slice check */
1643  if (s->codec_id == AV_CODEC_ID_MPEG4) {
1644  int next = mpeg4_is_resync(ctx);
1645  if (next) {
1646  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1647  return -1;
1648  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1649  return SLICE_END;
1650 
1651  if (s->pict_type == AV_PICTURE_TYPE_B) {
1652  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1653  ff_thread_await_progress(&s->next_picture_ptr->tf,
1654  (s->mb_x + delta >= s->mb_width)
1655  ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1656  : s->mb_y, 0);
1657  if (s->next_picture.mbskip_table[xy + delta])
1658  return SLICE_OK;
1659  }
1660 
1661  return SLICE_END;
1662  }
1663  }
1664 
1665  return SLICE_OK;
1666 }
1667 
1668 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1669 {
1670  int hours, minutes, seconds;
1671 
1672  if (!show_bits(gb, 23)) {
1673  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1674  return -1;
1675  }
1676 
1677  hours = get_bits(gb, 5);
1678  minutes = get_bits(gb, 6);
1679  skip_bits1(gb);
1680  seconds = get_bits(gb, 6);
1681 
1682  s->time_base = seconds + 60*(minutes + 60*hours);
1683 
1684  skip_bits1(gb);
1685  skip_bits1(gb);
1686 
1687  return 0;
1688 }
1689 
1690 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1691 {
1692 
1693  s->avctx->profile = get_bits(gb, 4);
1694  s->avctx->level = get_bits(gb, 4);
1695 
1696  // for Simple profile, level 0
1697  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1698  s->avctx->level = 0;
1699  }
1700 
1701  return 0;
1702 }
1703 
1704 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1705 {
1706  MpegEncContext *s = &ctx->m;
1707  int width, height, vo_ver_id;
1708 
1709  /* vol header */
1710  skip_bits(gb, 1); /* random access */
1711  s->vo_type = get_bits(gb, 8);
1712  if (get_bits1(gb) != 0) { /* is_ol_id */
1713  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1714  skip_bits(gb, 3); /* vo_priority */
1715  } else {
1716  vo_ver_id = 1;
1717  }
1718  s->aspect_ratio_info = get_bits(gb, 4);
1719  if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1720  s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1721  s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1722  } else {
1723  s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1724  }
1725 
1726  if ((s->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1727  int chroma_format = get_bits(gb, 2);
1728  if (chroma_format != CHROMA_420)
1729  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1730 
1731  s->low_delay = get_bits1(gb);
1732  if (get_bits1(gb)) { /* vbv parameters */
1733  get_bits(gb, 15); /* first_half_bitrate */
1734  skip_bits1(gb); /* marker */
1735  get_bits(gb, 15); /* latter_half_bitrate */
1736  skip_bits1(gb); /* marker */
1737  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1738  skip_bits1(gb); /* marker */
1739  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1740  get_bits(gb, 11); /* first_half_vbv_occupancy */
1741  skip_bits1(gb); /* marker */
1742  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1743  skip_bits1(gb); /* marker */
1744  }
1745  } else {
1746  /* is setting low delay flag only once the smartest thing to do?
1747  * low delay detection won't be overridden. */
1748  if (s->picture_number == 0)
1749  s->low_delay = 0;
1750  }
1751 
1752  ctx->shape = get_bits(gb, 2); /* vol shape */
1753  if (ctx->shape != RECT_SHAPE)
1754  av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1755  if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1756  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1757  skip_bits(gb, 4); /* video_object_layer_shape_extension */
1758  }
1759 
1760  check_marker(gb, "before time_increment_resolution");
1761 
1762  s->avctx->time_base.den = get_bits(gb, 16);
1763  if (!s->avctx->time_base.den) {
1764  av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1765  s->avctx->time_base.num = 0;
1766  return -1;
1767  }
1768 
1769  ctx->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1770  if (ctx->time_increment_bits < 1)
1771  ctx->time_increment_bits = 1;
1772 
1773  check_marker(gb, "before fixed_vop_rate");
1774 
1775  if (get_bits1(gb) != 0) /* fixed_vop_rate */
1776  s->avctx->time_base.num = get_bits(gb, ctx->time_increment_bits);
1777  else
1778  s->avctx->time_base.num = 1;
1779 
1780  ctx->t_frame = 0;
1781 
1782  if (ctx->shape != BIN_ONLY_SHAPE) {
1783  if (ctx->shape == RECT_SHAPE) {
1784  check_marker(gb, "before width");
1785  width = get_bits(gb, 13);
1786  check_marker(gb, "before height");
1787  height = get_bits(gb, 13);
1788  check_marker(gb, "after height");
1789  if (width && height && /* they should be non zero but who knows */
1790  !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1791  if (s->width && s->height &&
1792  (s->width != width || s->height != height))
1793  s->context_reinit = 1;
1794  s->width = width;
1795  s->height = height;
1796  }
1797  }
1798 
1799  s->progressive_sequence =
1800  s->progressive_frame = get_bits1(gb) ^ 1;
1801  s->interlaced_dct = 0;
1802  if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1803  av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1804  "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1805  if (vo_ver_id == 1)
1806  ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1807  else
1808  ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1809 
1810  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1811  av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1812  if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1813  ctx->vol_sprite_usage == GMC_SPRITE) {
1814  if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1815  skip_bits(gb, 13); // sprite_width
1816  skip_bits1(gb); /* marker */
1817  skip_bits(gb, 13); // sprite_height
1818  skip_bits1(gb); /* marker */
1819  skip_bits(gb, 13); // sprite_left
1820  skip_bits1(gb); /* marker */
1821  skip_bits(gb, 13); // sprite_top
1822  skip_bits1(gb); /* marker */
1823  }
1824  ctx->num_sprite_warping_points = get_bits(gb, 6);
1825  if (ctx->num_sprite_warping_points > 3) {
1826  av_log(s->avctx, AV_LOG_ERROR,
1827  "%d sprite_warping_points\n",
1828  ctx->num_sprite_warping_points);
1829  ctx->num_sprite_warping_points = 0;
1830  return -1;
1831  }
1832  s->sprite_warping_accuracy = get_bits(gb, 2);
1833  ctx->sprite_brightness_change = get_bits1(gb);
1834  if (ctx->vol_sprite_usage == STATIC_SPRITE)
1835  skip_bits1(gb); // low_latency_sprite
1836  }
1837  // FIXME sadct disable bit if verid!=1 && shape not rect
1838 
1839  if (get_bits1(gb) == 1) { /* not_8_bit */
1840  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1841  if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1842  av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1843  if (s->quant_precision != 5)
1844  av_log(s->avctx, AV_LOG_ERROR,
1845  "quant precision %d\n", s->quant_precision);
1846  if (s->quant_precision<3 || s->quant_precision>9) {
1847  s->quant_precision = 5;
1848  }
1849  } else {
1850  s->quant_precision = 5;
1851  }
1852 
1853  // FIXME a bunch of grayscale shape things
1854 
1855  if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1856  int i, v;
1857 
1858  /* load default matrixes */
1859  for (i = 0; i < 64; i++) {
1860  int j = s->idsp.idct_permutation[i];
1861  v = ff_mpeg4_default_intra_matrix[i];
1862  s->intra_matrix[j] = v;
1863  s->chroma_intra_matrix[j] = v;
1864 
1865  v = ff_mpeg4_default_non_intra_matrix[i];
1866  s->inter_matrix[j] = v;
1867  s->chroma_inter_matrix[j] = v;
1868  }
1869 
1870  /* load custom intra matrix */
1871  if (get_bits1(gb)) {
1872  int last = 0;
1873  for (i = 0; i < 64; i++) {
1874  int j;
1875  v = get_bits(gb, 8);
1876  if (v == 0)
1877  break;
1878 
1879  last = v;
1880  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1881  s->intra_matrix[j] = last;
1882  s->chroma_intra_matrix[j] = last;
1883  }
1884 
1885  /* replicate last value */
1886  for (; i < 64; i++) {
1887  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1888  s->intra_matrix[j] = last;
1889  s->chroma_intra_matrix[j] = last;
1890  }
1891  }
1892 
1893  /* load custom non intra matrix */
1894  if (get_bits1(gb)) {
1895  int last = 0;
1896  for (i = 0; i < 64; i++) {
1897  int j;
1898  v = get_bits(gb, 8);
1899  if (v == 0)
1900  break;
1901 
1902  last = v;
1903  j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1904  s->inter_matrix[j] = v;
1905  s->chroma_inter_matrix[j] = v;
1906  }
1907 
1908  /* replicate last value */
1909  for (; i < 64; i++) {
1910  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1911  s->inter_matrix[j] = last;
1912  s->chroma_inter_matrix[j] = last;
1913  }
1914  }
1915 
1916  // FIXME a bunch of grayscale shape things
1917  }
1918 
1919  if (vo_ver_id != 1)
1920  s->quarter_sample = get_bits1(gb);
1921  else
1922  s->quarter_sample = 0;
1923 
1924  if (get_bits_left(gb) < 4) {
1925  av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1926  return AVERROR_INVALIDDATA;
1927  }
1928 
1929  if (!get_bits1(gb)) {
1930  int pos = get_bits_count(gb);
1931  int estimation_method = get_bits(gb, 2);
1932  if (estimation_method < 2) {
1933  if (!get_bits1(gb)) {
1934  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1935  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1936  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1937  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1938  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1939  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1940  }
1941  if (!get_bits1(gb)) {
1942  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1943  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1944  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1945  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1946  }
1947  if (!check_marker(gb, "in complexity estimation part 1")) {
1948  skip_bits_long(gb, pos - get_bits_count(gb));
1949  goto no_cplx_est;
1950  }
1951  if (!get_bits1(gb)) {
1952  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1953  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1954  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1955  ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1956  }
1957  if (!get_bits1(gb)) {
1958  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1959  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1960  ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1961  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1962  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1963  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1964  }
1965  if (!check_marker(gb, "in complexity estimation part 2")) {
1966  skip_bits_long(gb, pos - get_bits_count(gb));
1967  goto no_cplx_est;
1968  }
1969  if (estimation_method == 1) {
1970  ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1971  ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1972  }
1973  } else
1974  av_log(s->avctx, AV_LOG_ERROR,
1975  "Invalid Complexity estimation method %d\n",
1976  estimation_method);
1977  } else {
1978 
1979 no_cplx_est:
1980  ctx->cplx_estimation_trash_i =
1981  ctx->cplx_estimation_trash_p =
1982  ctx->cplx_estimation_trash_b = 0;
1983  }
1984 
1985  ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1986 
1987  s->data_partitioning = get_bits1(gb);
1988  if (s->data_partitioning)
1989  ctx->rvlc = get_bits1(gb);
1990 
1991  if (vo_ver_id != 1) {
1992  ctx->new_pred = get_bits1(gb);
1993  if (ctx->new_pred) {
1994  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1995  skip_bits(gb, 2); /* requested upstream message type */
1996  skip_bits1(gb); /* newpred segment type */
1997  }
1998  if (get_bits1(gb)) // reduced_res_vop
1999  av_log(s->avctx, AV_LOG_ERROR,
2000  "reduced resolution VOP not supported\n");
2001  } else {
2002  ctx->new_pred = 0;
2003  }
2004 
2005  ctx->scalability = get_bits1(gb);
2006 
2007  if (ctx->scalability) {
2008  GetBitContext bak = *gb;
2009  int h_sampling_factor_n;
2010  int h_sampling_factor_m;
2011  int v_sampling_factor_n;
2012  int v_sampling_factor_m;
2013 
2014  skip_bits1(gb); // hierarchy_type
2015  skip_bits(gb, 4); /* ref_layer_id */
2016  skip_bits1(gb); /* ref_layer_sampling_dir */
2017  h_sampling_factor_n = get_bits(gb, 5);
2018  h_sampling_factor_m = get_bits(gb, 5);
2019  v_sampling_factor_n = get_bits(gb, 5);
2020  v_sampling_factor_m = get_bits(gb, 5);
2021  ctx->enhancement_type = get_bits1(gb);
2022 
2023  if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2024  v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2025  /* illegal scalability header (VERY broken encoder),
2026  * trying to workaround */
2027  ctx->scalability = 0;
2028  *gb = bak;
2029  } else
2030  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2031 
2032  // bin shape stuff FIXME
2033  }
2034  }
2035 
2036  if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2037  av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
2038  s->avctx->time_base.num, s->avctx->time_base.den,
2039  ctx->time_increment_bits,
2040  s->quant_precision,
2041  s->progressive_sequence,
2042  ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2043  s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2044  );
2045  }
2046 
2047  return 0;
2048 }
2049 
2050 /**
2051  * Decode the user data stuff in the header.
2052  * Also initializes divx/xvid/lavc_version/build.
2053  */
2054 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2055 {
2056  MpegEncContext *s = &ctx->m;
2057  char buf[256];
2058  int i;
2059  int e;
2060  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2061  char last;
2062 
2063  for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2064  if (show_bits(gb, 23) == 0)
2065  break;
2066  buf[i] = get_bits(gb, 8);
2067  }
2068  buf[i] = 0;
2069 
2070  /* divx detection */
2071  e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2072  if (e < 2)
2073  e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2074  if (e >= 2) {
2075  ctx->divx_version = ver;
2076  ctx->divx_build = build;
2077  s->divx_packed = e == 3 && last == 'p';
2078  if (s->divx_packed && !ctx->showed_packed_warning) {
2079  av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2080  "wasteful way to store B-frames ('packed B-frames'). "
2081  "Consider using a tool like VirtualDub or avidemux to fix it.\n");
2082  ctx->showed_packed_warning = 1;
2083  }
2084  }
2085 
2086  /* libavcodec detection */
2087  e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2088  if (e != 4)
2089  e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2090  if (e != 4) {
2091  e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2092  if (e > 1)
2093  build = (ver << 16) + (ver2 << 8) + ver3;
2094  }
2095  if (e != 4) {
2096  if (strcmp(buf, "ffmpeg") == 0)
2097  ctx->lavc_build = 4600;
2098  }
2099  if (e == 4)
2100  ctx->lavc_build = build;
2101 
2102  /* Xvid detection */
2103  e = sscanf(buf, "XviD%d", &build);
2104  if (e == 1)
2105  ctx->xvid_build = build;
2106 
2107  return 0;
2108 }
2109 
2110 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2111 {
2112  Mpeg4DecContext *ctx = avctx->priv_data;
2113  MpegEncContext *s = &ctx->m;
2114 
2115  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2116  if (s->stream_codec_tag == AV_RL32("XVID") ||
2117  s->codec_tag == AV_RL32("XVID") ||
2118  s->codec_tag == AV_RL32("XVIX") ||
2119  s->codec_tag == AV_RL32("RMP4") ||
2120  s->codec_tag == AV_RL32("ZMP4") ||
2121  s->codec_tag == AV_RL32("SIPP"))
2122  ctx->xvid_build = 0;
2123  }
2124 
2125  if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2126  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2127  s->vol_control_parameters == 0)
2128  ctx->divx_version = 400; // divx 4
2129 
2130  if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2131  ctx->divx_version =
2132  ctx->divx_build = -1;
2133  }
2134 
2135  if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2136  if (s->codec_tag == AV_RL32("XVIX"))
2137  s->workaround_bugs |= FF_BUG_XVID_ILACE;
2138 
2139  if (s->codec_tag == AV_RL32("UMP4"))
2140  s->workaround_bugs |= FF_BUG_UMP4;
2141 
2142  if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2143  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2144 
2145  if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2146  s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2147 
2148  if (ctx->xvid_build <= 3U)
2149  s->padding_bug_score = 256 * 256 * 256 * 64;
2150 
2151  if (ctx->xvid_build <= 1U)
2152  s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2153 
2154  if (ctx->xvid_build <= 12U)
2155  s->workaround_bugs |= FF_BUG_EDGE;
2156 
2157  if (ctx->xvid_build <= 32U)
2158  s->workaround_bugs |= FF_BUG_DC_CLIP;
2159 
2160 #define SET_QPEL_FUNC(postfix1, postfix2) \
2161  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2162  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2163  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2164 
2165  if (ctx->lavc_build < 4653U)
2166  s->workaround_bugs |= FF_BUG_STD_QPEL;
2167 
2168  if (ctx->lavc_build < 4655U)
2169  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2170 
2171  if (ctx->lavc_build < 4670U)
2172  s->workaround_bugs |= FF_BUG_EDGE;
2173 
2174  if (ctx->lavc_build <= 4712U)
2175  s->workaround_bugs |= FF_BUG_DC_CLIP;
2176 
2177  if (ctx->divx_version >= 0)
2178  s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2179  if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2180  s->padding_bug_score = 256 * 256 * 256 * 64;
2181 
2182  if (ctx->divx_version < 500U)
2183  s->workaround_bugs |= FF_BUG_EDGE;
2184 
2185  if (ctx->divx_version >= 0)
2186  s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2187  }
2188 
2189  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2190  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2191  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2192  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2193  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2194  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2195  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2196 
2197  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2198  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2199  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2200  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2201  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2202  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2203  }
2204 
2205  if (avctx->debug & FF_DEBUG_BUGS)
2206  av_log(s->avctx, AV_LOG_DEBUG,
2207  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2208  s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2209  ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2210 
2211 #if HAVE_MMX
2212  if (s->codec_id == AV_CODEC_ID_MPEG4 && ctx->xvid_build >= 0 &&
2213  avctx->idct_algo == FF_IDCT_AUTO &&
2214  (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
2215  avctx->idct_algo = FF_IDCT_XVIDMMX;
2216  ff_dct_common_init(s);
2217  return 1;
2218  }
2219 #endif
2220  return 0;
2221 }
2222 
2223 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2224 {
2225  MpegEncContext *s = &ctx->m;
2226  int time_incr, time_increment;
2227  int64_t pts;
2228 
2229  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2230  if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2231  s->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) {
2232  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
2233  s->low_delay = 0;
2234  }
2235 
2236  s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2237  if (s->partitioned_frame)
2238  s->decode_mb = mpeg4_decode_partitioned_mb;
2239  else
2240  s->decode_mb = mpeg4_decode_mb;
2241 
2242  time_incr = 0;
2243  while (get_bits1(gb) != 0)
2244  time_incr++;
2245 
2246  check_marker(gb, "before time_increment");
2247 
2248  if (ctx->time_increment_bits == 0 ||
2249  !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2250  av_log(s->avctx, AV_LOG_ERROR,
2251  "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
2252 
2253  for (ctx->time_increment_bits = 1;
2254  ctx->time_increment_bits < 16;
2255  ctx->time_increment_bits++) {
2256  if (s->pict_type == AV_PICTURE_TYPE_P ||
2257  (s->pict_type == AV_PICTURE_TYPE_S &&
2258  ctx->vol_sprite_usage == GMC_SPRITE)) {
2259  if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2260  break;
2261  } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2262  break;
2263  }
2264 
2265  av_log(s->avctx, AV_LOG_ERROR,
2266  "my guess is %d bits ;)\n", ctx->time_increment_bits);
2267  if (s->avctx->time_base.den && 4*s->avctx->time_base.den < 1<<ctx->time_increment_bits) {
2268  s->avctx->time_base.den = 1<<ctx->time_increment_bits;
2269  }
2270  }
2271 
2272  if (IS_3IV1)
2273  time_increment = get_bits1(gb); // FIXME investigate further
2274  else
2275  time_increment = get_bits(gb, ctx->time_increment_bits);
2276 
2277  if (s->pict_type != AV_PICTURE_TYPE_B) {
2278  s->last_time_base = s->time_base;
2279  s->time_base += time_incr;
2280  s->time = s->time_base * s->avctx->time_base.den + time_increment;
2281  if (s->workaround_bugs & FF_BUG_UMP4) {
2282  if (s->time < s->last_non_b_time) {
2283  /* header is not mpeg-4-compatible, broken encoder,
2284  * trying to workaround */
2285  s->time_base++;
2286  s->time += s->avctx->time_base.den;
2287  }
2288  }
2289  s->pp_time = s->time - s->last_non_b_time;
2290  s->last_non_b_time = s->time;
2291  } else {
2292  s->time = (s->last_time_base + time_incr) * s->avctx->time_base.den + time_increment;
2293  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2294  if (s->pp_time <= s->pb_time ||
2295  s->pp_time <= s->pp_time - s->pb_time ||
2296  s->pp_time <= 0) {
2297  /* messed up order, maybe after seeking? skipping current b-frame */
2298  return FRAME_SKIPPED;
2299  }
2300  ff_mpeg4_init_direct_mv(s);
2301 
2302  if (ctx->t_frame == 0)
2303  ctx->t_frame = s->pb_time;
2304  if (ctx->t_frame == 0)
2305  ctx->t_frame = 1; // 1/0 protection
2306  s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2307  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2308  s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2309  ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2310  if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2311  s->pb_field_time = 2;
2312  s->pp_field_time = 4;
2313  if (!s->progressive_sequence)
2314  return FRAME_SKIPPED;
2315  }
2316  }
2317 
2318  if (s->avctx->time_base.num)
2319  pts = ROUNDED_DIV(s->time, s->avctx->time_base.num);
2320  else
2321  pts = AV_NOPTS_VALUE;
2322  if (s->avctx->debug&FF_DEBUG_PTS)
2323  av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
2324  pts);
2325 
2326  check_marker(gb, "before vop_coded");
2327 
2328  /* vop coded */
2329  if (get_bits1(gb) != 1) {
2330  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2331  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2332  return FRAME_SKIPPED;
2333  }
2334  if (ctx->new_pred)
2335  decode_new_pred(ctx, gb);
2336 
2337  if (ctx->shape != BIN_ONLY_SHAPE &&
2338  (s->pict_type == AV_PICTURE_TYPE_P ||
2339  (s->pict_type == AV_PICTURE_TYPE_S &&
2340  ctx->vol_sprite_usage == GMC_SPRITE))) {
2341  /* rounding type for motion estimation */
2342  s->no_rounding = get_bits1(gb);
2343  } else {
2344  s->no_rounding = 0;
2345  }
2346  // FIXME reduced res stuff
2347 
2348  if (ctx->shape != RECT_SHAPE) {
2349  if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2350  skip_bits(gb, 13); /* width */
2351  skip_bits1(gb); /* marker */
2352  skip_bits(gb, 13); /* height */
2353  skip_bits1(gb); /* marker */
2354  skip_bits(gb, 13); /* hor_spat_ref */
2355  skip_bits1(gb); /* marker */
2356  skip_bits(gb, 13); /* ver_spat_ref */
2357  }
2358  skip_bits1(gb); /* change_CR_disable */
2359 
2360  if (get_bits1(gb) != 0)
2361  skip_bits(gb, 8); /* constant_alpha_value */
2362  }
2363 
2364  // FIXME complexity estimation stuff
2365 
2366  if (ctx->shape != BIN_ONLY_SHAPE) {
2367  skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2368  if (s->pict_type != AV_PICTURE_TYPE_I)
2369  skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2370  if (s->pict_type == AV_PICTURE_TYPE_B)
2371  skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2372 
2373  if (get_bits_left(gb) < 3) {
2374  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2375  return -1;
2376  }
2377  ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2378  if (!s->progressive_sequence) {
2379  s->top_field_first = get_bits1(gb);
2380  s->alternate_scan = get_bits1(gb);
2381  } else
2382  s->alternate_scan = 0;
2383  }
2384 
2385  if (s->alternate_scan) {
2386  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2387  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2388  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2389  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2390  } else {
2391  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2392  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2393  ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2394  ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2395  }
2396 
2397  if (s->pict_type == AV_PICTURE_TYPE_S &&
2398  (ctx->vol_sprite_usage == STATIC_SPRITE ||
2399  ctx->vol_sprite_usage == GMC_SPRITE)) {
2400  if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2401  return AVERROR_INVALIDDATA;
2402  if (ctx->sprite_brightness_change)
2403  av_log(s->avctx, AV_LOG_ERROR,
2404  "sprite_brightness_change not supported\n");
2405  if (ctx->vol_sprite_usage == STATIC_SPRITE)
2406  av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2407  }
2408 
2409  if (ctx->shape != BIN_ONLY_SHAPE) {
2410  s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2411  if (s->qscale == 0) {
2412  av_log(s->avctx, AV_LOG_ERROR,
2413  "Error, header damaged or not MPEG4 header (qscale=0)\n");
2414  return -1; // makes no sense to continue, as there is nothing left from the image then
2415  }
2416 
2417  if (s->pict_type != AV_PICTURE_TYPE_I) {
2418  s->f_code = get_bits(gb, 3); /* fcode_for */
2419  if (s->f_code == 0) {
2420  av_log(s->avctx, AV_LOG_ERROR,
2421  "Error, header damaged or not MPEG4 header (f_code=0)\n");
2422  s->f_code = 1;
2423  return -1; // makes no sense to continue, as there is nothing left from the image then
2424  }
2425  } else
2426  s->f_code = 1;
2427 
2428  if (s->pict_type == AV_PICTURE_TYPE_B) {
2429  s->b_code = get_bits(gb, 3);
2430  if (s->b_code == 0) {
2431  av_log(s->avctx, AV_LOG_ERROR,
2432  "Error, header damaged or not MPEG4 header (b_code=0)\n");
2433  s->b_code=1;
2434  return -1; // makes no sense to continue, as the MV decoding will break very quickly
2435  }
2436  } else
2437  s->b_code = 1;
2438 
2439  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2440  av_log(s->avctx, AV_LOG_DEBUG,
2441  "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d time:%"PRId64" tincr:%d\n",
2442  s->qscale, s->f_code, s->b_code,
2443  s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
2444  gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2445  s->top_field_first, s->quarter_sample ? "q" : "h",
2446  s->data_partitioning, ctx->resync_marker,
2447  ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2448  1 - s->no_rounding, s->vo_type,
2449  s->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2450  ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2451  ctx->cplx_estimation_trash_b,
2452  s->time,
2453  time_increment
2454  );
2455  }
2456 
2457  if (!ctx->scalability) {
2458  if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2459  skip_bits1(gb); // vop shape coding type
2460  } else {
2461  if (ctx->enhancement_type) {
2462  int load_backward_shape = get_bits1(gb);
2463  if (load_backward_shape)
2464  av_log(s->avctx, AV_LOG_ERROR,
2465  "load backward shape isn't supported\n");
2466  }
2467  skip_bits(gb, 2); // ref_select_code
2468  }
2469  }
2470  /* detect buggy encoders which don't set the low_delay flag
2471  * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2472  * easily (although it's buggy too) */
2473  if (s->vo_type == 0 && s->vol_control_parameters == 0 &&
2474  ctx->divx_version == -1 && s->picture_number == 0) {
2475  av_log(s->avctx, AV_LOG_WARNING,
2476  "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2477  s->low_delay = 1;
2478  }
2479 
2480  s->picture_number++; // better than pic number==0 always ;)
2481 
2482  // FIXME add short header support
2483  s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2484  s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2485 
2486  if (s->workaround_bugs & FF_BUG_EDGE) {
2487  s->h_edge_pos = s->width;
2488  s->v_edge_pos = s->height;
2489  }
2490  return 0;
2491 }
2492 
2493 /**
2494  * Decode mpeg4 headers.
2495  * @return <0 if no VOP found (or a damaged one)
2496  * FRAME_SKIPPED if a not coded VOP is found
2497  * 0 if a VOP is found
2498  */
2499 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2500 {
2501  MpegEncContext *s = &ctx->m;
2502  unsigned startcode, v;
2503 
2504  /* search next start code */
2505  align_get_bits(gb);
2506 
2507  if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2508  skip_bits(gb, 24);
2509  if (get_bits(gb, 8) == 0xF0)
2510  goto end;
2511  }
2512 
2513  startcode = 0xff;
2514  for (;;) {
2515  if (get_bits_count(gb) >= gb->size_in_bits) {
2516  if (gb->size_in_bits == 8 &&
2517  (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2518  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2519  return FRAME_SKIPPED; // divx bug
2520  } else
2521  return -1; // end of stream
2522  }
2523 
2524  /* use the bits after the test */
2525  v = get_bits(gb, 8);
2526  startcode = ((startcode << 8) | v) & 0xffffffff;
2527 
2528  if ((startcode & 0xFFFFFF00) != 0x100)
2529  continue; // no startcode
2530 
2531  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2532  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2533  if (startcode <= 0x11F)
2534  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2535  else if (startcode <= 0x12F)
2536  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2537  else if (startcode <= 0x13F)
2538  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2539  else if (startcode <= 0x15F)
2540  av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2541  else if (startcode <= 0x1AF)
2542  av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2543  else if (startcode == 0x1B0)
2544  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2545  else if (startcode == 0x1B1)
2546  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2547  else if (startcode == 0x1B2)
2548  av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2549  else if (startcode == 0x1B3)
2550  av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2551  else if (startcode == 0x1B4)
2552  av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2553  else if (startcode == 0x1B5)
2554  av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2555  else if (startcode == 0x1B6)
2556  av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2557  else if (startcode == 0x1B7)
2558  av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2559  else if (startcode == 0x1B8)
2560  av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2561  else if (startcode == 0x1B9)
2562  av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2563  else if (startcode == 0x1BA)
2564  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2565  else if (startcode == 0x1BB)
2566  av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2567  else if (startcode == 0x1BC)
2568  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2569  else if (startcode == 0x1BD)
2570  av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2571  else if (startcode == 0x1BE)
2572  av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2573  else if (startcode == 0x1BF)
2574  av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2575  else if (startcode == 0x1C0)
2576  av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2577  else if (startcode == 0x1C1)
2578  av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2579  else if (startcode == 0x1C2)
2580  av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2581  else if (startcode == 0x1C3)
2582  av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2583  else if (startcode <= 0x1C5)
2584  av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2585  else if (startcode <= 0x1FF)
2586  av_log(s->avctx, AV_LOG_DEBUG, "System start");
2587  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2588  }
2589 
2590  if (startcode >= 0x120 && startcode <= 0x12F) {
2591  if (decode_vol_header(ctx, gb) < 0)
2592  return -1;
2593  } else if (startcode == USER_DATA_STARTCODE) {
2594  decode_user_data(ctx, gb);
2595  } else if (startcode == GOP_STARTCODE) {
2596  mpeg4_decode_gop_header(s, gb);
2597  } else if (startcode == VOS_STARTCODE) {
2598  mpeg4_decode_profile_level(s, gb);
2599  } else if (startcode == VOP_STARTCODE) {
2600  break;
2601  }
2602 
2603  align_get_bits(gb);
2604  startcode = 0xff;
2605  }
2606 
2607 end:
2608  if (s->flags & CODEC_FLAG_LOW_DELAY)
2609  s->low_delay = 1;
2610  s->avctx->has_b_frames = !s->low_delay;
2611 
2612  return decode_vop_header(ctx, gb);
2613 }
2614 
2615 av_cold void ff_mpeg4videodec_static_init(void) {
2616  static int done = 0;
2617 
2618  if (!done) {
2619  ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2620  ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2621  ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2622  INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2623  INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2624  INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2625  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2626  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2627  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2628  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2629  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2630  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2631  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2632  &ff_sprite_trajectory_tab[0][1], 4, 2,
2633  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2634  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2635  &ff_mb_type_b_tab[0][1], 2, 1,
2636  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2637  done = 1;
2638  }
2639 }
2640 
2641 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2642 {
2643  Mpeg4DecContext *ctx = avctx->priv_data;
2644  MpegEncContext *s = &ctx->m;
2645 
2646  /* divx 5.01+ bitstream reorder stuff */
2647  /* Since this clobbers the input buffer and hwaccel codecs still need the
2648  * data during hwaccel->end_frame we should not do this any earlier */
2649  if (s->divx_packed) {
2650  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2651  int startcode_found = 0;
2652 
2653  if (buf_size - current_pos > 7) {
2654 
2655  int i;
2656  for (i = current_pos; i < buf_size - 4; i++)
2657 
2658  if (buf[i] == 0 &&
2659  buf[i + 1] == 0 &&
2660  buf[i + 2] == 1 &&
2661  buf[i + 3] == 0xB6) {
2662  startcode_found = !(buf[i + 4] & 0x40);
2663  break;
2664  }
2665  }
2666 
2667  if (startcode_found) {
2668  av_fast_padded_malloc(&s->bitstream_buffer,
2669  &s->allocated_bitstream_buffer_size,
2670  buf_size - current_pos);
2671  if (!s->bitstream_buffer)
2672  return AVERROR(ENOMEM);
2673  memcpy(s->bitstream_buffer, buf + current_pos,
2674  buf_size - current_pos);
2675  s->bitstream_buffer_size = buf_size - current_pos;
2676  }
2677  }
2678 
2679  return 0;
2680 }
2681 
2682 static int mpeg4_update_thread_context(AVCodecContext *dst,
2683  const AVCodecContext *src)
2684 {
2685  Mpeg4DecContext *s = dst->priv_data;
2686  const Mpeg4DecContext *s1 = src->priv_data;
2687 
2688  int ret = ff_mpeg_update_thread_context(dst, src);
2689 
2690  if (ret < 0)
2691  return ret;
2692 
2693  memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2694 
2695  return 0;
2696 }
2697 
2698 static av_cold int decode_init(AVCodecContext *avctx)
2699 {
2700  Mpeg4DecContext *ctx = avctx->priv_data;
2701  MpegEncContext *s = &ctx->m;
2702  int ret;
2703 
2704  ctx->divx_version =
2705  ctx->divx_build =
2706  ctx->xvid_build =
2707  ctx->lavc_build = -1;
2708 
2709  if ((ret = ff_h263_decode_init(avctx)) < 0)
2710  return ret;
2711 
2712  ff_mpeg4videodec_static_init();
2713 
2714  s->h263_pred = 1;
2715  s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2716  s->decode_mb = mpeg4_decode_mb;
2717  ctx->time_increment_bits = 4; /* default value for broken headers */
2718 
2719  avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2720  avctx->internal->allocate_progress = 1;
2721 
2722  return 0;
2723 }
2724 
2725 static const AVProfile mpeg4_video_profiles[] = {
2726  { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2727  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2728  { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2729  { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2730  { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2731  { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2732  { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2733  { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2734  { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2735  { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2736  { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2737  { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2738  { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2739  { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2740  { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2741  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2742  { FF_PROFILE_UNKNOWN },
2743 };
2744 
2745 static const AVOption mpeg4_options[] = {
2746  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2747  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2748  {NULL}
2749 };
2750 
2751 static const AVClass mpeg4_class = {
2752  "MPEG4 Video Decoder",
2753  av_default_item_name,
2754  mpeg4_options,
2755  LIBAVUTIL_VERSION_INT,
2756 };
2757 
2758 static const AVClass mpeg4_vdpau_class = {
2759  "MPEG4 Video VDPAU Decoder",
2760  av_default_item_name,
2761  mpeg4_options,
2762  LIBAVUTIL_VERSION_INT,
2763 };
2764 
2765 AVCodec ff_mpeg4_decoder = {
2766  .name = "mpeg4",
2767  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2768  .type = AVMEDIA_TYPE_VIDEO,
2769  .id = AV_CODEC_ID_MPEG4,
2770  .priv_data_size = sizeof(Mpeg4DecContext),
2771  .init = decode_init,
2772  .close = ff_h263_decode_end,
2773  .decode = ff_h263_decode_frame,
2774  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2775  CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2776  CODEC_CAP_FRAME_THREADS,
2777  .flush = ff_mpeg_flush,
2778  .max_lowres = 3,
2779  .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2780  .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2781  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2782  .priv_class = &mpeg4_class,
2783 };
2784 
2785 
2786 #if CONFIG_MPEG4_VDPAU_DECODER
2787 AVCodec ff_mpeg4_vdpau_decoder = {
2788  .name = "mpeg4_vdpau",
2789  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2790  .type = AVMEDIA_TYPE_VIDEO,
2791  .id = AV_CODEC_ID_MPEG4,
2792  .priv_data_size = sizeof(MpegEncContext),
2793  .init = decode_init,
2794  .close = ff_h263_decode_end,
2795  .decode = ff_h263_decode_frame,
2796  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2797  CODEC_CAP_HWACCEL_VDPAU,
2798  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2799  AV_PIX_FMT_NONE },
2800  .priv_class = &mpeg4_vdpau_class,
2801 };
2802 #endif
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