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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 "internal.h"
28 #include "mpegvideo.h"
29 #include "mpeg4video.h"
30 #include "h263.h"
31 #include "thread.h"
32 
33 // The defines below define the number of bits that are read at once for
34 // reading vlc values. Changing these may improve speed and data cache needs
35 // be aware though that decreasing them may need the number of stages that is
36 // passed to get_vlc* to be increased.
37 #define SPRITE_TRAJ_VLC_BITS 6
38 #define DC_VLC_BITS 9
39 #define MB_TYPE_B_VLC_BITS 4
40 
41 
45 
46 static const int mb_type_b_map[4]= {
51 };
52 
53 /**
54  * Predict the ac.
55  * @param n block index (0-3 are luma, 4-5 are chroma)
56  * @param dir the ac prediction direction
57  */
58 void ff_mpeg4_pred_ac(MpegEncContext * s, int16_t *block, int n,
59  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] || n==1 || n==3){
75  /* same qscale */
76  for(i=1;i<8;i++) {
77  block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
78  }
79  }else{
80  /* different qscale, we must rescale */
81  for(i=1;i<8;i++) {
82  block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
83  }
84  }
85  } else {
86  const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
87  /* top prediction */
88  ac_val -= 16 * s->block_wrap[n];
89 
90  if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
91  /* same qscale */
92  for(i=1;i<8;i++) {
93  block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
94  }
95  }else{
96  /* different qscale, we must rescale */
97  for(i=1;i<8;i++) {
98  block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
99  }
100  }
101  }
102  }
103  /* left copy */
104  for(i=1;i<8;i++)
105  ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
106 
107  /* top copy */
108  for(i=1;i<8;i++)
109  ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
110 
111 }
112 
113 /**
114  * check if the next stuff is a resync marker or the end.
115  * @return 0 if not
116  */
117 static inline int mpeg4_is_resync(MpegEncContext *s){
118  int bits_count= get_bits_count(&s->gb);
119  int v= show_bits(&s->gb, 16);
120 
122  return 0;
123  }
124 
125  while(v<=0xFF){
126  if(s->pict_type==AV_PICTURE_TYPE_B || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
127  break;
128  skip_bits(&s->gb, 8+s->pict_type);
129  bits_count+= 8+s->pict_type;
130  v= show_bits(&s->gb, 16);
131  }
132 
133  if(bits_count + 8 >= s->gb.size_in_bits){
134  v>>=8;
135  v|= 0x7F >> (7-(bits_count&7));
136 
137  if(v==0x7F)
138  return s->mb_num;
139  }else{
140  if(v == ff_mpeg4_resync_prefix[bits_count&7]){
141  int len, mb_num;
142  int mb_num_bits= av_log2(s->mb_num - 1) + 1;
143  GetBitContext gb= s->gb;
144 
145  skip_bits(&s->gb, 1);
146  align_get_bits(&s->gb);
147 
148  for(len=0; len<32; len++){
149  if(get_bits1(&s->gb)) break;
150  }
151 
152  mb_num= get_bits(&s->gb, mb_num_bits);
153  if(!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
154  mb_num= -1;
155 
156  s->gb= gb;
157 
159  return mb_num;
160  }
161  }
162  return 0;
163 }
164 
166 {
167  int i;
168  int a= 2<<s->sprite_warping_accuracy;
169  int rho= 3-s->sprite_warping_accuracy;
170  int r=16/a;
171  const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
172  int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
173  int sprite_ref[4][2];
174  int virtual_ref[2][2];
175  int w2, h2, w3, h3;
176  int alpha=0, beta=0;
177  int w= s->width;
178  int h= s->height;
179  int min_ab;
180 
181  if(w<=0 || h<=0)
182  return -1;
183 
184  for(i=0; i<s->num_sprite_warping_points; i++){
185  int length;
186  int x=0, y=0;
187 
188  length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
189  if(length){
190  x= get_xbits(gb, length);
191  }
192  if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
193 
194  length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
195  if(length){
196  y=get_xbits(gb, length);
197  }
198  skip_bits1(gb); /* marker bit */
199  s->sprite_traj[i][0]= d[i][0]= x;
200  s->sprite_traj[i][1]= d[i][1]= y;
201  }
202  for(; i<4; i++)
203  s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
204 
205  while((1<<alpha)<w) alpha++;
206  while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
207  w2= 1<<alpha;
208  h2= 1<<beta;
209 
210 // Note, the 4th point isn't used for GMC
211  if(s->divx_version==500 && s->divx_build==413){
212  sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
213  sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
214  sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
215  sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
216  sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
217  sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
218  } else {
219  sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
220  sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
221  sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
222  sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
223  sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
224  sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
225  }
226 /* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
227  sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
228 
229 // this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
230 // perhaps it should be reordered to be more readable ...
231 // the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
232 // so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
233  virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
234  + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w);
235  virtual_ref[0][1]= 16*vop_ref[0][1]
236  + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w);
237  virtual_ref[1][0]= 16*vop_ref[0][0]
238  + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h);
239  virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
240  + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),h);
241 
242  switch(s->num_sprite_warping_points)
243  {
244  case 0:
245  s->sprite_offset[0][0]= 0;
246  s->sprite_offset[0][1]= 0;
247  s->sprite_offset[1][0]= 0;
248  s->sprite_offset[1][1]= 0;
249  s->sprite_delta[0][0]= a;
250  s->sprite_delta[0][1]= 0;
251  s->sprite_delta[1][0]= 0;
252  s->sprite_delta[1][1]= a;
253  s->sprite_shift[0]= 0;
254  s->sprite_shift[1]= 0;
255  break;
256  case 1: //GMC only
257  s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
258  s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
259  s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
260  s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
261  s->sprite_delta[0][0]= a;
262  s->sprite_delta[0][1]= 0;
263  s->sprite_delta[1][0]= 0;
264  s->sprite_delta[1][1]= a;
265  s->sprite_shift[0]= 0;
266  s->sprite_shift[1]= 0;
267  break;
268  case 2:
269  s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
270  + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
271  + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
272  + (1<<(alpha+rho-1));
273  s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
274  + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
275  + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
276  + (1<<(alpha+rho-1));
277  s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
278  +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
279  +2*w2*r*sprite_ref[0][0]
280  - 16*w2
281  + (1<<(alpha+rho+1)));
282  s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
283  +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
284  +2*w2*r*sprite_ref[0][1]
285  - 16*w2
286  + (1<<(alpha+rho+1)));
287  s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
288  s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
289  s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
290  s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
291 
292  s->sprite_shift[0]= alpha+rho;
293  s->sprite_shift[1]= alpha+rho+2;
294  break;
295  case 3:
296  min_ab= FFMIN(alpha, beta);
297  w3= w2>>min_ab;
298  h3= h2>>min_ab;
299  s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
300  + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
301  + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
302  + (1<<(alpha+beta+rho-min_ab-1));
303  s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
304  + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
305  + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
306  + (1<<(alpha+beta+rho-min_ab-1));
307  s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
308  + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
309  + 2*w2*h3*r*sprite_ref[0][0]
310  - 16*w2*h3
311  + (1<<(alpha+beta+rho-min_ab+1));
312  s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
313  + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
314  + 2*w2*h3*r*sprite_ref[0][1]
315  - 16*w2*h3
316  + (1<<(alpha+beta+rho-min_ab+1));
317  s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
318  s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
319  s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
320  s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
321 
322  s->sprite_shift[0]= alpha + beta + rho - min_ab;
323  s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
324  break;
325  }
326  /* try to simplify the situation */
327  if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
328  && s->sprite_delta[0][1] == 0
329  && s->sprite_delta[1][0] == 0
330  && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
331  {
332  s->sprite_offset[0][0]>>=s->sprite_shift[0];
333  s->sprite_offset[0][1]>>=s->sprite_shift[0];
334  s->sprite_offset[1][0]>>=s->sprite_shift[1];
335  s->sprite_offset[1][1]>>=s->sprite_shift[1];
336  s->sprite_delta[0][0]= a;
337  s->sprite_delta[0][1]= 0;
338  s->sprite_delta[1][0]= 0;
339  s->sprite_delta[1][1]= a;
340  s->sprite_shift[0]= 0;
341  s->sprite_shift[1]= 0;
343  }
344  else{
345  int shift_y= 16 - s->sprite_shift[0];
346  int shift_c= 16 - s->sprite_shift[1];
347  for(i=0; i<2; i++){
348  s->sprite_offset[0][i]<<= shift_y;
349  s->sprite_offset[1][i]<<= shift_c;
350  s->sprite_delta[0][i]<<= shift_y;
351  s->sprite_delta[1][i]<<= shift_y;
352  s->sprite_shift[i]= 16;
353  }
355  }
356  return 0;
357 }
358 
359 /**
360  * Decode the next video packet.
361  * @return <0 if something went wrong
362  */
364 {
365  int mb_num_bits= av_log2(s->mb_num - 1) + 1;
366  int header_extension=0, mb_num, len;
367 
368  /* is there enough space left for a video packet + header */
369  if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
370 
371  for(len=0; len<32; len++){
372  if(get_bits1(&s->gb)) break;
373  }
374 
376  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
377  return -1;
378  }
379 
380  if(s->shape != RECT_SHAPE){
381  header_extension= get_bits1(&s->gb);
382  //FIXME more stuff here
383  }
384 
385  mb_num= get_bits(&s->gb, mb_num_bits);
386  if(mb_num>=s->mb_num){
387  av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
388  return -1;
389  }
390 
391  s->mb_x= mb_num % s->mb_width;
392  s->mb_y= mb_num / s->mb_width;
393 
394  if(s->shape != BIN_ONLY_SHAPE){
395  int qscale= get_bits(&s->gb, s->quant_precision);
396  if(qscale)
397  s->chroma_qscale=s->qscale= qscale;
398  }
399 
400  if(s->shape == RECT_SHAPE){
401  header_extension= get_bits1(&s->gb);
402  }
403  if(header_extension){
404  int time_incr=0;
405 
406  while (get_bits1(&s->gb) != 0)
407  time_incr++;
408 
409  check_marker(&s->gb, "before time_increment in video packed header");
410  skip_bits(&s->gb, s->time_increment_bits); /* time_increment */
411  check_marker(&s->gb, "before vop_coding_type in video packed header");
412 
413  skip_bits(&s->gb, 2); /* vop coding type */
414  //FIXME not rect stuff here
415 
416  if(s->shape != BIN_ONLY_SHAPE){
417  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
418 //FIXME don't just ignore everything
420  if(mpeg4_decode_sprite_trajectory(s, &s->gb) < 0)
421  return -1;
422  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
423  }
424 
425  //FIXME reduced res stuff here
426 
427  if (s->pict_type != AV_PICTURE_TYPE_I) {
428  int f_code = get_bits(&s->gb, 3); /* fcode_for */
429  if(f_code==0){
430  av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
431  }
432  }
433  if (s->pict_type == AV_PICTURE_TYPE_B) {
434  int b_code = get_bits(&s->gb, 3);
435  if(b_code==0){
436  av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
437  }
438  }
439  }
440  }
441  //FIXME new-pred stuff
442 
443  return 0;
444 }
445 
446 /**
447  * Get the average motion vector for a GMC MB.
448  * @param n either 0 for the x component or 1 for y
449  * @return the average MV for a GMC MB
450  */
451 static inline int get_amv(MpegEncContext *s, int n){
452  int x, y, mb_v, sum, dx, dy, shift;
453  int len = 1 << (s->f_code + 4);
454  const int a= s->sprite_warping_accuracy;
455 
456  if(s->workaround_bugs & FF_BUG_AMV)
457  len >>= s->quarter_sample;
458 
459  if(s->real_sprite_warping_points==1){
460  if(s->divx_version==500 && s->divx_build==413)
461  sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
462  else
463  sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
464  }else{
465  dx= s->sprite_delta[n][0];
466  dy= s->sprite_delta[n][1];
467  shift= s->sprite_shift[0];
468  if(n) dy -= 1<<(shift + a + 1);
469  else dx -= 1<<(shift + a + 1);
470  mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
471 
472  sum=0;
473  for(y=0; y<16; y++){
474  int v;
475 
476  v= mb_v + dy*y;
477  //XXX FIXME optimize
478  for(x=0; x<16; x++){
479  sum+= v>>shift;
480  v+= dx;
481  }
482  }
483  sum= RSHIFT(sum, a+8-s->quarter_sample);
484  }
485 
486  if (sum < -len) sum= -len;
487  else if (sum >= len) sum= len-1;
488 
489  return sum;
490 }
491 
492 /**
493  * Decode the dc value.
494  * @param n block index (0-3 are luma, 4-5 are chroma)
495  * @param dir_ptr the prediction direction will be stored here
496  * @return the quantized dc
497  */
498 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
499 {
500  int level, code;
501 
502  if (n < 4)
503  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
504  else
505  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
506  if (code < 0 || code > 9 /* && s->nbit<9 */){
507  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
508  return -1;
509  }
510  if (code == 0) {
511  level = 0;
512  } else {
513  if(IS_3IV1){
514  if(code==1)
515  level= 2*get_bits1(&s->gb)-1;
516  else{
517  if(get_bits1(&s->gb))
518  level = get_bits(&s->gb, code-1) + (1<<(code-1));
519  else
520  level = -get_bits(&s->gb, code-1) - (1<<(code-1));
521  }
522  }else{
523  level = get_xbits(&s->gb, code);
524  }
525 
526  if (code > 8){
527  if(get_bits1(&s->gb)==0){ /* marker */
529  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
530  return -1;
531  }
532  }
533  }
534  }
535 
536  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
537 }
538 
539 /**
540  * Decode first partition.
541  * @return number of MBs decoded or <0 if an error occurred
542  */
544  int mb_num;
545  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
546 
547  /* decode first partition */
548  mb_num=0;
549  s->first_slice_line=1;
550  for(; s->mb_y<s->mb_height; s->mb_y++){
552  for(; s->mb_x<s->mb_width; s->mb_x++){
553  const int xy= s->mb_x + s->mb_y*s->mb_stride;
554  int cbpc;
555  int dir=0;
556 
557  mb_num++;
559  if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
560  s->first_slice_line=0;
561 
563  int i;
564 
565  do{
566  if(show_bits_long(&s->gb, 19)==DC_MARKER){
567  return mb_num-1;
568  }
569 
571  if (cbpc < 0){
572  av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
573  return -1;
574  }
575  }while(cbpc == 8);
576 
577  s->cbp_table[xy]= cbpc & 3;
579  s->mb_intra = 1;
580 
581  if(cbpc & 4) {
582  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
583  }
585 
586  s->mbintra_table[xy]= 1;
587  for(i=0; i<6; i++){
588  int dc_pred_dir;
589  int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
590  if(dc < 0){
591  av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
592  return -1;
593  }
594  dir<<=1;
595  if(dc_pred_dir) dir|=1;
596  }
597  s->pred_dir_table[xy]= dir;
598  }else{ /* P/S_TYPE */
599  int mx, my, pred_x, pred_y, bits;
600  int16_t * const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
601  const int stride= s->b8_stride*2;
602 
603 try_again:
604  bits= show_bits(&s->gb, 17);
605  if(bits==MOTION_MARKER){
606  return mb_num-1;
607  }
608  skip_bits1(&s->gb);
609  if(bits&0x10000){
610  /* skip mb */
613  mx= get_amv(s, 0);
614  my= get_amv(s, 1);
615  }else{
617  mx=my=0;
618  }
619  mot_val[0 ]= mot_val[2 ]=
620  mot_val[0+stride]= mot_val[2+stride]= mx;
621  mot_val[1 ]= mot_val[3 ]=
622  mot_val[1+stride]= mot_val[3+stride]= my;
623 
624  if(s->mbintra_table[xy])
626  continue;
627  }
628 
630  if (cbpc < 0){
631  av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
632  return -1;
633  }
634  if(cbpc == 20)
635  goto try_again;
636 
637  s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
638 
639  s->mb_intra = ((cbpc & 4) != 0);
640 
641  if(s->mb_intra){
643  s->mbintra_table[xy]= 1;
644  mot_val[0 ]= mot_val[2 ]=
645  mot_val[0+stride]= mot_val[2+stride]= 0;
646  mot_val[1 ]= mot_val[3 ]=
647  mot_val[1+stride]= mot_val[3+stride]= 0;
648  }else{
649  if(s->mbintra_table[xy])
651 
652  if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
653  s->mcsel= get_bits1(&s->gb);
654  else s->mcsel= 0;
655 
656  if ((cbpc & 16) == 0) {
657  /* 16x16 motion prediction */
658 
659  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
660  if(!s->mcsel){
661  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
662  if (mx >= 0xffff)
663  return -1;
664 
665  my = ff_h263_decode_motion(s, pred_y, s->f_code);
666  if (my >= 0xffff)
667  return -1;
669  } else {
670  mx = get_amv(s, 0);
671  my = get_amv(s, 1);
673  }
674 
675  mot_val[0 ]= mot_val[2 ] =
676  mot_val[0+stride]= mot_val[2+stride]= mx;
677  mot_val[1 ]= mot_val[3 ]=
678  mot_val[1+stride]= mot_val[3+stride]= my;
679  } else {
680  int i;
682  for(i=0;i<4;i++) {
683  int16_t *mot_val= ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
684  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
685  if (mx >= 0xffff)
686  return -1;
687 
688  my = ff_h263_decode_motion(s, pred_y, s->f_code);
689  if (my >= 0xffff)
690  return -1;
691  mot_val[0] = mx;
692  mot_val[1] = my;
693  }
694  }
695  }
696  }
697  }
698  s->mb_x= 0;
699  }
700 
701  return mb_num;
702 }
703 
704 /**
705  * decode second partition.
706  * @return <0 if an error occurred
707  */
708 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
709  int mb_num=0;
710  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
711 
712  s->mb_x= s->resync_mb_x;
713  s->first_slice_line=1;
714  for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
716  for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
717  const int xy= s->mb_x + s->mb_y*s->mb_stride;
718 
719  mb_num++;
721  if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
722  s->first_slice_line=0;
723 
725  int ac_pred= get_bits1(&s->gb);
726  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
727  if(cbpy<0){
728  av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
729  return -1;
730  }
731 
732  s->cbp_table[xy]|= cbpy<<2;
733  s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
734  }else{ /* P || S_TYPE */
735  if (IS_INTRA(s->current_picture.mb_type[xy])) {
736  int dir=0,i;
737  int ac_pred = get_bits1(&s->gb);
738  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
739 
740  if(cbpy<0){
741  av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
742  return -1;
743  }
744 
745  if(s->cbp_table[xy] & 8) {
746  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
747  }
748  s->current_picture.qscale_table[xy] = s->qscale;
749 
750  for(i=0; i<6; i++){
751  int dc_pred_dir;
752  int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
753  if(dc < 0){
754  av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
755  return -1;
756  }
757  dir<<=1;
758  if(dc_pred_dir) dir|=1;
759  }
760  s->cbp_table[xy]&= 3; //remove dquant
761  s->cbp_table[xy]|= cbpy<<2;
762  s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
763  s->pred_dir_table[xy]= dir;
764  } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
765  s->current_picture.qscale_table[xy] = s->qscale;
766  s->cbp_table[xy]= 0;
767  }else{
768  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
769 
770  if(cbpy<0){
771  av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
772  return -1;
773  }
774 
775  if(s->cbp_table[xy] & 8) {
776  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
777  }
778  s->current_picture.qscale_table[xy] = s->qscale;
779 
780  s->cbp_table[xy]&= 3; //remove dquant
781  s->cbp_table[xy]|= (cbpy^0xf)<<2;
782  }
783  }
784  }
785  if(mb_num >= mb_count) return 0;
786  s->mb_x= 0;
787  }
788  return 0;
789 }
790 
791 /**
792  * Decode the first and second partition.
793  * @return <0 if error (and sets error type in the error_status_table)
794  */
796 {
797  int mb_num;
798  const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_ERROR|ER_MV_ERROR) : ER_MV_ERROR;
799  const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_END |ER_MV_END) : ER_MV_END;
800 
801  mb_num= mpeg4_decode_partition_a(s);
802  if(mb_num<0){
803  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
804  return -1;
805  }
806 
807  if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
808  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
809  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
810  return -1;
811  }
812 
813  s->mb_num_left= mb_num;
814 
816  while(show_bits(&s->gb, 9) == 1)
817  skip_bits(&s->gb, 9);
818  if(get_bits_long(&s->gb, 19)!=DC_MARKER){
819  av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
820  return -1;
821  }
822  }else{
823  while(show_bits(&s->gb, 10) == 1)
824  skip_bits(&s->gb, 10);
825  if(get_bits(&s->gb, 17)!=MOTION_MARKER){
826  av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
827  return -1;
828  }
829  }
830  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
831 
832  if( mpeg4_decode_partition_b(s, mb_num) < 0){
835  return -1;
836  }else{
838  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_DC_END);
839  }
840 
841  return 0;
842 }
843 
844 /**
845  * Decode a block.
846  * @return <0 if an error occurred
847  */
848 static inline int mpeg4_decode_block(MpegEncContext * s, int16_t * block,
849  int n, int coded, int intra, int rvlc)
850 {
851  int level, i, last, run;
852  int av_uninit(dc_pred_dir);
853  RLTable * rl;
854  RL_VLC_ELEM * rl_vlc;
855  const uint8_t * scan_table;
856  int qmul, qadd;
857 
858  //Note intra & rvlc should be optimized away if this is inlined
859 
860  if(intra) {
861  if(s->use_intra_dc_vlc){
862  /* DC coef */
863  if(s->partitioned_frame){
864  level = s->dc_val[0][ s->block_index[n] ];
865  if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
866  else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
867  dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
868  }else{
869  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
870  if (level < 0)
871  return -1;
872  }
873  block[0] = level;
874  i = 0;
875  }else{
876  i = -1;
877  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
878  }
879  if (!coded)
880  goto not_coded;
881 
882  if(rvlc){
883  rl = &ff_rvlc_rl_intra;
884  rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
885  }else{
886  rl = &ff_mpeg4_rl_intra;
887  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
888  }
889  if (s->ac_pred) {
890  if (dc_pred_dir == 0)
891  scan_table = s->intra_v_scantable.permutated; /* left */
892  else
893  scan_table = s->intra_h_scantable.permutated; /* top */
894  } else {
895  scan_table = s->intra_scantable.permutated;
896  }
897  qmul=1;
898  qadd=0;
899  } else {
900  i = -1;
901  if (!coded) {
902  s->block_last_index[n] = i;
903  return 0;
904  }
905  if(rvlc) rl = &ff_rvlc_rl_inter;
906  else rl = &ff_h263_rl_inter;
907 
908  scan_table = s->intra_scantable.permutated;
909 
910  if(s->mpeg_quant){
911  qmul=1;
912  qadd=0;
913  if(rvlc){
914  rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
915  }else{
916  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
917  }
918  }else{
919  qmul = s->qscale << 1;
920  qadd = (s->qscale - 1) | 1;
921  if(rvlc){
922  rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
923  }else{
924  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
925  }
926  }
927  }
928  {
929  OPEN_READER(re, &s->gb);
930  for(;;) {
931  UPDATE_CACHE(re, &s->gb);
932  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
933  if (level==0) {
934  /* escape */
935  if(rvlc){
936  if(SHOW_UBITS(re, &s->gb, 1)==0){
937  av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
938  return -1;
939  }; SKIP_CACHE(re, &s->gb, 1);
940 
941  last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
942  run= SHOW_UBITS(re, &s->gb, 6);
943  SKIP_COUNTER(re, &s->gb, 1+1+6);
944  UPDATE_CACHE(re, &s->gb);
945 
946  if(SHOW_UBITS(re, &s->gb, 1)==0){
947  av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
948  return -1;
949  }; SKIP_CACHE(re, &s->gb, 1);
950 
951  level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
952 
953  if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
954  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
955  return -1;
956  }; SKIP_CACHE(re, &s->gb, 5);
957 
958  level= level * qmul + qadd;
959  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
960  SKIP_COUNTER(re, &s->gb, 1+11+5+1);
961 
962  i+= run + 1;
963  if(last) i+=192;
964  }else{
965  int cache;
966  cache= GET_CACHE(re, &s->gb);
967 
968  if(IS_3IV1)
969  cache ^= 0xC0000000;
970 
971  if (cache&0x80000000) {
972  if (cache&0x40000000) {
973  /* third escape */
974  SKIP_CACHE(re, &s->gb, 2);
975  last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
976  run= SHOW_UBITS(re, &s->gb, 6);
977  SKIP_COUNTER(re, &s->gb, 2+1+6);
978  UPDATE_CACHE(re, &s->gb);
979 
980  if(IS_3IV1){
981  level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
982  }else{
983  if(SHOW_UBITS(re, &s->gb, 1)==0){
984  av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
985  return -1;
986  }; SKIP_CACHE(re, &s->gb, 1);
987 
988  level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
989 
990  if(SHOW_UBITS(re, &s->gb, 1)==0){
991  av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
992  return -1;
993  }
994 
995  SKIP_COUNTER(re, &s->gb, 1+12+1);
996  }
997 
998 #if 0
999  if(s->error_recognition >= FF_ER_COMPLIANT){
1000  const int abs_level= FFABS(level);
1001  if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
1002  const int run1= run - rl->max_run[last][abs_level] - 1;
1003  if(abs_level <= rl->max_level[last][run]){
1004  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1005  return -1;
1006  }
1007  if(s->error_recognition > FF_ER_COMPLIANT){
1008  if(abs_level <= rl->max_level[last][run]*2){
1009  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1010  return -1;
1011  }
1012  if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
1013  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1014  return -1;
1015  }
1016  }
1017  }
1018  }
1019 #endif
1020  if (level>0) level= level * qmul + qadd;
1021  else level= level * qmul - qadd;
1022 
1023  if((unsigned)(level + 2048) > 4095){
1025  if(level > 2560 || level<-2560){
1026  av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
1027  return -1;
1028  }
1029  }
1030  level= level<0 ? -2048 : 2047;
1031  }
1032 
1033  i+= run + 1;
1034  if(last) i+=192;
1035  } else {
1036  /* second escape */
1037  SKIP_BITS(re, &s->gb, 2);
1038  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1039  i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
1040  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1041  LAST_SKIP_BITS(re, &s->gb, 1);
1042  }
1043  } else {
1044  /* first escape */
1045  SKIP_BITS(re, &s->gb, 1);
1046  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1047  i+= run;
1048  level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1049  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1050  LAST_SKIP_BITS(re, &s->gb, 1);
1051  }
1052  }
1053  } else {
1054  i+= run;
1055  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1056  LAST_SKIP_BITS(re, &s->gb, 1);
1057  }
1058  if (i > 62){
1059  i-= 192;
1060  if(i&(~63)){
1061  av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1062  return -1;
1063  }
1064 
1065  block[scan_table[i]] = level;
1066  break;
1067  }
1068 
1069  block[scan_table[i]] = level;
1070  }
1071  CLOSE_READER(re, &s->gb);
1072  }
1073  not_coded:
1074  if (intra) {
1075  if(!s->use_intra_dc_vlc){
1076  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1077 
1078  i -= i>>31; //if(i == -1) i=0;
1079  }
1080 
1081  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1082  if (s->ac_pred) {
1083  i = 63; /* XXX: not optimal */
1084  }
1085  }
1086  s->block_last_index[n] = i;
1087  return 0;
1088 }
1089 
1090 /**
1091  * decode partition C of one MB.
1092  * @return <0 if an error occurred
1093  */
1095 {
1096  int cbp, mb_type;
1097  const int xy= s->mb_x + s->mb_y*s->mb_stride;
1098 
1099  mb_type = s->current_picture.mb_type[xy];
1100  cbp = s->cbp_table[xy];
1101 
1103 
1104  if (s->current_picture.qscale_table[xy] != s->qscale) {
1106  }
1107 
1109  int i;
1110  for(i=0; i<4; i++){
1111  s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1112  s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1113  }
1114  s->mb_intra = IS_INTRA(mb_type);
1115 
1116  if (IS_SKIP(mb_type)) {
1117  /* skip mb */
1118  for(i=0;i<6;i++)
1119  s->block_last_index[i] = -1;
1120  s->mv_dir = MV_DIR_FORWARD;
1121  s->mv_type = MV_TYPE_16X16;
1123  s->mcsel=1;
1124  s->mb_skipped = 0;
1125  }else{
1126  s->mcsel=0;
1127  s->mb_skipped = 1;
1128  }
1129  }else if(s->mb_intra){
1131  }else if(!s->mb_intra){
1132 // s->mcsel= 0; //FIXME do we need to init that
1133 
1134  s->mv_dir = MV_DIR_FORWARD;
1135  if (IS_8X8(mb_type)) {
1136  s->mv_type = MV_TYPE_8X8;
1137  } else {
1138  s->mv_type = MV_TYPE_16X16;
1139  }
1140  }
1141  } else { /* I-Frame */
1142  s->mb_intra = 1;
1144  }
1145 
1146  if (!IS_SKIP(mb_type)) {
1147  int i;
1148  s->dsp.clear_blocks(s->block[0]);
1149  /* decode each block */
1150  for (i = 0; i < 6; i++) {
1151  if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
1152  av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
1153  return -1;
1154  }
1155  cbp+=cbp;
1156  }
1157  }
1158 
1159  /* per-MB end of slice check */
1160 
1161  if(--s->mb_num_left <= 0){
1162  if(mpeg4_is_resync(s))
1163  return SLICE_END;
1164  else
1165  return SLICE_NOEND;
1166  }else{
1167  if(mpeg4_is_resync(s)){
1168  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1169  if(s->cbp_table[xy+delta])
1170  return SLICE_END;
1171  }
1172  return SLICE_OK;
1173  }
1174 }
1175 
1177  int16_t block[6][64])
1178 {
1179  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1180  int16_t *mot_val;
1181  static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1182  const int xy= s->mb_x + s->mb_y * s->mb_stride;
1183 
1184  av_assert2(s->h263_pred);
1185 
1187  do{
1188  if (get_bits1(&s->gb)) {
1189  /* skip mb */
1190  s->mb_intra = 0;
1191  for(i=0;i<6;i++)
1192  s->block_last_index[i] = -1;
1193  s->mv_dir = MV_DIR_FORWARD;
1194  s->mv_type = MV_TYPE_16X16;
1197  s->mcsel=1;
1198  s->mv[0][0][0]= get_amv(s, 0);
1199  s->mv[0][0][1]= get_amv(s, 1);
1200 
1201  s->mb_skipped = 0;
1202  }else{
1204  s->mcsel=0;
1205  s->mv[0][0][0] = 0;
1206  s->mv[0][0][1] = 0;
1207  s->mb_skipped = 1;
1208  }
1209  goto end;
1210  }
1212  if (cbpc < 0){
1213  av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1214  return -1;
1215  }
1216  }while(cbpc == 20);
1217 
1218  s->dsp.clear_blocks(s->block[0]);
1219  dquant = cbpc & 8;
1220  s->mb_intra = ((cbpc & 4) != 0);
1221  if (s->mb_intra) goto intra;
1222 
1223  if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
1224  s->mcsel= get_bits1(&s->gb);
1225  else s->mcsel= 0;
1226  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1227 
1228  cbp = (cbpc & 3) | (cbpy << 2);
1229  if (dquant) {
1230  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1231  }
1232  if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
1233  s->interlaced_dct= get_bits1(&s->gb);
1234 
1235  s->mv_dir = MV_DIR_FORWARD;
1236  if ((cbpc & 16) == 0) {
1237  if(s->mcsel){
1239  /* 16x16 global motion prediction */
1240  s->mv_type = MV_TYPE_16X16;
1241  mx= get_amv(s, 0);
1242  my= get_amv(s, 1);
1243  s->mv[0][0][0] = mx;
1244  s->mv[0][0][1] = my;
1245  }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
1247  /* 16x8 field motion prediction */
1248  s->mv_type= MV_TYPE_FIELD;
1249 
1250  s->field_select[0][0]= get_bits1(&s->gb);
1251  s->field_select[0][1]= get_bits1(&s->gb);
1252 
1253  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1254 
1255  for(i=0; i<2; i++){
1256  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1257  if (mx >= 0xffff)
1258  return -1;
1259 
1260  my = ff_h263_decode_motion(s, pred_y/2, s->f_code);
1261  if (my >= 0xffff)
1262  return -1;
1263 
1264  s->mv[0][i][0] = mx;
1265  s->mv[0][i][1] = my;
1266  }
1267  }else{
1269  /* 16x16 motion prediction */
1270  s->mv_type = MV_TYPE_16X16;
1271  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1272  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1273 
1274  if (mx >= 0xffff)
1275  return -1;
1276 
1277  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1278 
1279  if (my >= 0xffff)
1280  return -1;
1281  s->mv[0][0][0] = mx;
1282  s->mv[0][0][1] = my;
1283  }
1284  } else {
1286  s->mv_type = MV_TYPE_8X8;
1287  for(i=0;i<4;i++) {
1288  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1289  mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1290  if (mx >= 0xffff)
1291  return -1;
1292 
1293  my = ff_h263_decode_motion(s, pred_y, s->f_code);
1294  if (my >= 0xffff)
1295  return -1;
1296  s->mv[0][i][0] = mx;
1297  s->mv[0][i][1] = my;
1298  mot_val[0] = mx;
1299  mot_val[1] = my;
1300  }
1301  }
1302  } else if(s->pict_type==AV_PICTURE_TYPE_B) {
1303  int modb1; // first bit of modb
1304  int modb2; // second bit of modb
1305  int mb_type;
1306 
1307  s->mb_intra = 0; //B-frames never contain intra blocks
1308  s->mcsel=0; // ... true gmc blocks
1309 
1310  if(s->mb_x==0){
1311  for(i=0; i<2; i++){
1312  s->last_mv[i][0][0]=
1313  s->last_mv[i][0][1]=
1314  s->last_mv[i][1][0]=
1315  s->last_mv[i][1][1]= 0;
1316  }
1317 
1319  }
1320 
1321  /* if we skipped it in the future P Frame than skip it now too */
1322  s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1323 
1324  if(s->mb_skipped){
1325  /* skip mb */
1326  for(i=0;i<6;i++)
1327  s->block_last_index[i] = -1;
1328 
1329  s->mv_dir = MV_DIR_FORWARD;
1330  s->mv_type = MV_TYPE_16X16;
1331  s->mv[0][0][0] = 0;
1332  s->mv[0][0][1] = 0;
1333  s->mv[1][0][0] = 0;
1334  s->mv[1][0][1] = 0;
1336  goto end;
1337  }
1338 
1339  modb1= get_bits1(&s->gb);
1340  if(modb1){
1341  mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
1342  cbp=0;
1343  }else{
1344  modb2= get_bits1(&s->gb);
1345  mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1346  if(mb_type<0){
1347  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1348  return -1;
1349  }
1350  mb_type= mb_type_b_map[ mb_type ];
1351  if(modb2) cbp= 0;
1352  else{
1353  s->dsp.clear_blocks(s->block[0]);
1354  cbp= get_bits(&s->gb, 6);
1355  }
1356 
1357  if ((!IS_DIRECT(mb_type)) && cbp) {
1358  if(get_bits1(&s->gb)){
1359  ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
1360  }
1361  }
1362 
1363  if(!s->progressive_sequence){
1364  if(cbp)
1365  s->interlaced_dct= get_bits1(&s->gb);
1366 
1367  if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
1368  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1369  mb_type &= ~MB_TYPE_16x16;
1370 
1371  if(USES_LIST(mb_type, 0)){
1372  s->field_select[0][0]= get_bits1(&s->gb);
1373  s->field_select[0][1]= get_bits1(&s->gb);
1374  }
1375  if(USES_LIST(mb_type, 1)){
1376  s->field_select[1][0]= get_bits1(&s->gb);
1377  s->field_select[1][1]= get_bits1(&s->gb);
1378  }
1379  }
1380  }
1381 
1382  s->mv_dir = 0;
1383  if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
1384  s->mv_type= MV_TYPE_16X16;
1385 
1386  if(USES_LIST(mb_type, 0)){
1387  s->mv_dir = MV_DIR_FORWARD;
1388 
1389  mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1390  my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1391  s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
1392  s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
1393  }
1394 
1395  if(USES_LIST(mb_type, 1)){
1396  s->mv_dir |= MV_DIR_BACKWARD;
1397 
1398  mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1399  my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1400  s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
1401  s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
1402  }
1403  }else if(!IS_DIRECT(mb_type)){
1404  s->mv_type= MV_TYPE_FIELD;
1405 
1406  if(USES_LIST(mb_type, 0)){
1407  s->mv_dir = MV_DIR_FORWARD;
1408 
1409  for(i=0; i<2; i++){
1410  mx = ff_h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
1411  my = ff_h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
1412  s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
1413  s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
1414  }
1415  }
1416 
1417  if(USES_LIST(mb_type, 1)){
1418  s->mv_dir |= MV_DIR_BACKWARD;
1419 
1420  for(i=0; i<2; i++){
1421  mx = ff_h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
1422  my = ff_h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
1423  s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
1424  s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
1425  }
1426  }
1427  }
1428  }
1429 
1430  if(IS_DIRECT(mb_type)){
1431  if(IS_SKIP(mb_type))
1432  mx=my=0;
1433  else{
1434  mx = ff_h263_decode_motion(s, 0, 1);
1435  my = ff_h263_decode_motion(s, 0, 1);
1436  }
1437 
1439  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1440  }
1441  s->current_picture.mb_type[xy] = mb_type;
1442  } else { /* I-Frame */
1443  do{
1445  if (cbpc < 0){
1446  av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1447  return -1;
1448  }
1449  }while(cbpc == 8);
1450 
1451  dquant = cbpc & 4;
1452  s->mb_intra = 1;
1453 intra:
1454  s->ac_pred = get_bits1(&s->gb);
1455  if(s->ac_pred)
1457  else
1459 
1460  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1461  if(cbpy<0){
1462  av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1463  return -1;
1464  }
1465  cbp = (cbpc & 3) | (cbpy << 2);
1466 
1468 
1469  if (dquant) {
1470  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1471  }
1472 
1473  if(!s->progressive_sequence)
1474  s->interlaced_dct= get_bits1(&s->gb);
1475 
1476  s->dsp.clear_blocks(s->block[0]);
1477  /* decode each block */
1478  for (i = 0; i < 6; i++) {
1479  if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
1480  return -1;
1481  cbp+=cbp;
1482  }
1483  goto end;
1484  }
1485 
1486  /* decode each block */
1487  for (i = 0; i < 6; i++) {
1488  if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
1489  return -1;
1490  cbp+=cbp;
1491  }
1492 end:
1493 
1494  /* per-MB end of slice check */
1495  if(s->codec_id==AV_CODEC_ID_MPEG4){
1496  int next= mpeg4_is_resync(s);
1497  if(next) {
1498  if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1499  return -1;
1500  } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1501  return SLICE_END;
1502 
1503  if(s->pict_type==AV_PICTURE_TYPE_B){
1504  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1506  (s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y+1, s->mb_height-1) : s->mb_y, 0);
1507  if (s->next_picture.mbskip_table[xy + delta])
1508  return SLICE_OK;
1509  }
1510 
1511  return SLICE_END;
1512  }
1513  }
1514 
1515  return SLICE_OK;
1516 }
1517 
1518 
1520  int hours, minutes, seconds;
1521 
1522  if(!show_bits(gb, 23)){
1523  av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1524  return -1;
1525  }
1526 
1527  hours= get_bits(gb, 5);
1528  minutes= get_bits(gb, 6);
1529  skip_bits1(gb);
1530  seconds= get_bits(gb, 6);
1531 
1532  s->time_base= seconds + 60*(minutes + 60*hours);
1533 
1534  skip_bits1(gb);
1535  skip_bits1(gb);
1536 
1537  return 0;
1538 }
1539 
1541 
1542  s->avctx->profile = get_bits(gb, 4);
1543  s->avctx->level = get_bits(gb, 4);
1544 
1545  // for Simple profile, level 0
1546  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1547  s->avctx->level = 0;
1548  }
1549 
1550  return 0;
1551 }
1552 
1554  int width, height, vo_ver_id;
1555 
1556  /* vol header */
1557  skip_bits(gb, 1); /* random access */
1558  s->vo_type= get_bits(gb, 8);
1559  if (get_bits1(gb) != 0) { /* is_ol_id */
1560  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1561  skip_bits(gb, 3); /* vo_priority */
1562  } else {
1563  vo_ver_id = 1;
1564  }
1565  s->aspect_ratio_info= get_bits(gb, 4);
1567  s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
1568  s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
1569  }else{
1571  }
1572 
1573  if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
1574  int chroma_format= get_bits(gb, 2);
1575  if(chroma_format!=CHROMA_420){
1576  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1577  }
1578  s->low_delay= get_bits1(gb);
1579  if(get_bits1(gb)){ /* vbv parameters */
1580  get_bits(gb, 15); /* first_half_bitrate */
1581  skip_bits1(gb); /* marker */
1582  get_bits(gb, 15); /* latter_half_bitrate */
1583  skip_bits1(gb); /* marker */
1584  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1585  skip_bits1(gb); /* marker */
1586  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1587  get_bits(gb, 11); /* first_half_vbv_occupancy */
1588  skip_bits1(gb); /* marker */
1589  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1590  skip_bits1(gb); /* marker */
1591  }
1592  }else{
1593  // set low delay flag only once the smartest? low delay detection won't be overridden
1594  if(s->picture_number==0)
1595  s->low_delay=0;
1596  }
1597 
1598  s->shape = get_bits(gb, 2); /* vol shape */
1599  if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1600  if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
1601  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1602  skip_bits(gb, 4); //video_object_layer_shape_extension
1603  }
1604 
1605  check_marker(gb, "before time_increment_resolution");
1606 
1607  s->avctx->time_base.den = get_bits(gb, 16);
1608  if(!s->avctx->time_base.den){
1609  av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1610  s->avctx->time_base.num = 0;
1611  return -1;
1612  }
1613 
1614  s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1615  if (s->time_increment_bits < 1)
1616  s->time_increment_bits = 1;
1617 
1618  check_marker(gb, "before fixed_vop_rate");
1619 
1620  if (get_bits1(gb) != 0) { /* fixed_vop_rate */
1622  }else
1623  s->avctx->time_base.num = 1;
1624 
1625  s->t_frame=0;
1626 
1627  if (s->shape != BIN_ONLY_SHAPE) {
1628  if (s->shape == RECT_SHAPE) {
1629  skip_bits1(gb); /* marker */
1630  width = get_bits(gb, 13);
1631  skip_bits1(gb); /* marker */
1632  height = get_bits(gb, 13);
1633  skip_bits1(gb); /* marker */
1634  if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
1635  if (s->width && s->height &&
1636  (s->width != width || s->height != height))
1637  s->context_reinit = 1;
1638  s->width = width;
1639  s->height = height;
1640  }
1641  }
1642 
1644  s->progressive_frame= get_bits1(gb)^1;
1645  s->interlaced_dct=0;
1646  if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1647  av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
1648  if (vo_ver_id == 1) {
1649  s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1650  } else {
1651  s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1652  }
1653  if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1656  s->sprite_width = get_bits(gb, 13);
1657  skip_bits1(gb); /* marker */
1658  s->sprite_height= get_bits(gb, 13);
1659  skip_bits1(gb); /* marker */
1660  s->sprite_left = get_bits(gb, 13);
1661  skip_bits1(gb); /* marker */
1662  s->sprite_top = get_bits(gb, 13);
1663  skip_bits1(gb); /* marker */
1664  }
1666  if(s->num_sprite_warping_points > 3){
1667  av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
1669  return -1;
1670  }
1671  s->sprite_warping_accuracy = get_bits(gb, 2);
1674  s->low_latency_sprite= get_bits1(gb);
1675  }
1676  // FIXME sadct disable bit if verid!=1 && shape not rect
1677 
1678  if (get_bits1(gb) == 1) { /* not_8_bit */
1679  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1680  if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
1681  if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
1682  if(s->quant_precision<3 || s->quant_precision>9) {
1683  s->quant_precision = 5;
1684  }
1685  } else {
1686  s->quant_precision = 5;
1687  }
1688 
1689  // FIXME a bunch of grayscale shape things
1690 
1691  if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
1692  int i, v;
1693 
1694  /* load default matrixes */
1695  for(i=0; i<64; i++){
1696  int j= s->dsp.idct_permutation[i];
1698  s->intra_matrix[j]= v;
1699  s->chroma_intra_matrix[j]= v;
1700 
1702  s->inter_matrix[j]= v;
1703  s->chroma_inter_matrix[j]= v;
1704  }
1705 
1706  /* load custom intra matrix */
1707  if(get_bits1(gb)){
1708  int last=0;
1709  for(i=0; i<64; i++){
1710  int j;
1711  v= get_bits(gb, 8);
1712  if(v==0) break;
1713 
1714  last= v;
1716  s->intra_matrix[j]= v;
1717  s->chroma_intra_matrix[j]= v;
1718  }
1719 
1720  /* replicate last value */
1721  for(; i<64; i++){
1722  int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1723  s->intra_matrix[j]= last;
1724  s->chroma_intra_matrix[j]= last;
1725  }
1726  }
1727 
1728  /* load custom non intra matrix */
1729  if(get_bits1(gb)){
1730  int last=0;
1731  for(i=0; i<64; i++){
1732  int j;
1733  v= get_bits(gb, 8);
1734  if(v==0) break;
1735 
1736  last= v;
1738  s->inter_matrix[j]= v;
1739  s->chroma_inter_matrix[j]= v;
1740  }
1741 
1742  /* replicate last value */
1743  for(; i<64; i++){
1744  int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1745  s->inter_matrix[j]= last;
1746  s->chroma_inter_matrix[j]= last;
1747  }
1748  }
1749 
1750  // FIXME a bunch of grayscale shape things
1751  }
1752 
1753  if(vo_ver_id != 1)
1754  s->quarter_sample= get_bits1(gb);
1755  else s->quarter_sample=0;
1756 
1757  if(!get_bits1(gb)){
1758  int pos= get_bits_count(gb);
1759  int estimation_method= get_bits(gb, 2);
1760  if(estimation_method<2){
1761  if(!get_bits1(gb)){
1762  s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
1763  s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
1764  s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
1765  s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
1766  s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
1767  s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
1768  }
1769  if(!get_bits1(gb)){
1770  s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
1771  s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
1772  s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
1773  s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
1774  }
1775  if(!check_marker(gb, "in complexity estimation part 1")){
1776  skip_bits_long(gb, pos - get_bits_count(gb));
1777  goto no_cplx_est;
1778  }
1779  if(!get_bits1(gb)){
1780  s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
1781  s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
1782  s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
1783  s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
1784  }
1785  if(!get_bits1(gb)){
1786  s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
1787  s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
1788  s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
1789  s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
1790  s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
1791  s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
1792  }
1793  if(!check_marker(gb, "in complexity estimation part 2")){
1794  skip_bits_long(gb, pos - get_bits_count(gb));
1795  goto no_cplx_est;
1796  }
1797  if(estimation_method==1){
1798  s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
1799  s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
1800  }
1801  }else
1802  av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
1803  }else{
1804 no_cplx_est:
1808  }
1809 
1810  s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
1811 
1812  s->data_partitioning= get_bits1(gb);
1813  if(s->data_partitioning){
1814  s->rvlc= get_bits1(gb);
1815  }
1816 
1817  if(vo_ver_id != 1) {
1818  s->new_pred= get_bits1(gb);
1819  if(s->new_pred){
1820  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1821  skip_bits(gb, 2); /* requested upstream message type */
1822  skip_bits1(gb); /* newpred segment type */
1823  }
1824  s->reduced_res_vop= get_bits1(gb);
1825  if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
1826  }
1827  else{
1828  s->new_pred=0;
1829  s->reduced_res_vop= 0;
1830  }
1831 
1832  s->scalability= get_bits1(gb);
1833 
1834  if (s->scalability) {
1835  GetBitContext bak= *gb;
1836  int h_sampling_factor_n;
1837  int h_sampling_factor_m;
1838  int v_sampling_factor_n;
1839  int v_sampling_factor_m;
1840 
1841  s->hierachy_type= get_bits1(gb);
1842  skip_bits(gb, 4); /* ref_layer_id */
1843  skip_bits1(gb); /* ref_layer_sampling_dir */
1844  h_sampling_factor_n= get_bits(gb, 5);
1845  h_sampling_factor_m= get_bits(gb, 5);
1846  v_sampling_factor_n= get_bits(gb, 5);
1847  v_sampling_factor_m= get_bits(gb, 5);
1848  s->enhancement_type= get_bits1(gb);
1849 
1850  if( h_sampling_factor_n==0 || h_sampling_factor_m==0
1851  || v_sampling_factor_n==0 || v_sampling_factor_m==0){
1852  /* illegal scalability header (VERY broken encoder),
1853  * trying to workaround */
1854  s->scalability=0;
1855  *gb= bak;
1856  }else
1857  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1858 
1859  // bin shape stuff FIXME
1860  }
1861  }
1862 
1863  if(s->avctx->debug&FF_DEBUG_PICT_INFO) {
1864  av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
1865  s->avctx->time_base.num, s->avctx->time_base.den,
1867  s->quant_precision,
1869  s->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
1870  s->data_partitioning ? "partition " : "", s->rvlc ? "rvlc " : ""
1871  );
1872  }
1873 
1874  return 0;
1875 }
1876 
1877 /**
1878  * Decode the user data stuff in the header.
1879  * Also initializes divx/xvid/lavc_version/build.
1880  */
1882  char buf[256];
1883  int i;
1884  int e;
1885  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
1886  char last;
1887 
1888  for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
1889  if(show_bits(gb, 23) == 0) break;
1890  buf[i]= get_bits(gb, 8);
1891  }
1892  buf[i]=0;
1893 
1894  /* divx detection */
1895  e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
1896  if(e<2)
1897  e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
1898  if(e>=2){
1899  s->divx_version= ver;
1900  s->divx_build= build;
1901  s->divx_packed= e==3 && last=='p';
1902  if(s->divx_packed && !s->showed_packed_warning) {
1903  av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
1904  s->showed_packed_warning=1;
1905  }
1906  }
1907 
1908  /* libavcodec detection */
1909  e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
1910  if(e!=4)
1911  e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
1912  if(e!=4){
1913  e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
1914  if (e>1)
1915  build= (ver<<16) + (ver2<<8) + ver3;
1916  }
1917  if(e!=4){
1918  if(strcmp(buf, "ffmpeg")==0){
1919  s->lavc_build= 4600;
1920  }
1921  }
1922  if(e==4){
1923  s->lavc_build= build;
1924  }
1925 
1926  /* Xvid detection */
1927  e=sscanf(buf, "XviD%d", &build);
1928  if(e==1){
1929  s->xvid_build= build;
1930  }
1931 
1932  return 0;
1933 }
1934 
1936  int time_incr, time_increment;
1937 
1938  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
1940  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
1941  s->low_delay=0;
1942  }
1943 
1945  if(s->partitioned_frame)
1947  else
1949 
1950  time_incr=0;
1951  while (get_bits1(gb) != 0)
1952  time_incr++;
1953 
1954  check_marker(gb, "before time_increment");
1955 
1956  if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
1957  av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
1958 
1960  if ( s->pict_type == AV_PICTURE_TYPE_P
1962  if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
1963  }else
1964  if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
1965  }
1966 
1967  av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
1968  if (s->avctx->time_base.den && 4*s->avctx->time_base.den < 1<<s->time_increment_bits) {
1969  s->avctx->time_base.den = 1<<s->time_increment_bits;
1970  }
1971  }
1972 
1973  if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
1974  else time_increment= get_bits(gb, s->time_increment_bits);
1975 
1976  if(s->pict_type!=AV_PICTURE_TYPE_B){
1977  s->last_time_base= s->time_base;
1978  s->time_base+= time_incr;
1979  s->time= s->time_base*s->avctx->time_base.den + time_increment;
1981  if(s->time < s->last_non_b_time){
1982  /* header is not mpeg-4-compatible, broken encoder,
1983  * trying to workaround */
1984  s->time_base++;
1985  s->time+= s->avctx->time_base.den;
1986  }
1987  }
1988  s->pp_time= s->time - s->last_non_b_time;
1989  s->last_non_b_time= s->time;
1990  }else{
1991  s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
1992  s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
1993  if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
1994  /* messed up order, maybe after seeking? skipping current b-frame */
1995  return FRAME_SKIPPED;
1996  }
1998 
1999  if(s->t_frame==0) s->t_frame= s->pb_time;
2000  if(s->t_frame==0) s->t_frame=1; // 1/0 protection
2002  - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
2003  s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
2004  - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
2005  if(!s->progressive_sequence){
2006  if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
2007  return FRAME_SKIPPED;
2008  }
2009  }
2010 
2011  if(s->avctx->time_base.num)
2013  else
2015  if(s->avctx->debug&FF_DEBUG_PTS)
2016  av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
2017  s->current_picture_ptr->f.pts);
2018 
2019  check_marker(gb, "before vop_coded");
2020 
2021  /* vop coded */
2022  if (get_bits1(gb) != 1){
2024  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2025  return FRAME_SKIPPED;
2026  }
2027  if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == AV_PICTURE_TYPE_P
2029  /* rounding type for motion estimation */
2030  s->no_rounding = get_bits1(gb);
2031  } else {
2032  s->no_rounding = 0;
2033  }
2034 //FIXME reduced res stuff
2035 
2036  if (s->shape != RECT_SHAPE) {
2037  if (s->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2038  skip_bits(gb, 13); /* width */
2039  skip_bits1(gb); /* marker */
2040  skip_bits(gb, 13); /* height */
2041  skip_bits1(gb); /* marker */
2042  skip_bits(gb, 13); /* hor_spat_ref */
2043  skip_bits1(gb); /* marker */
2044  skip_bits(gb, 13); /* ver_spat_ref */
2045  }
2046  skip_bits1(gb); /* change_CR_disable */
2047 
2048  if (get_bits1(gb) != 0) {
2049  skip_bits(gb, 8); /* constant_alpha_value */
2050  }
2051  }
2052 //FIXME complexity estimation stuff
2053 
2054  if (s->shape != BIN_ONLY_SHAPE) {
2056  if(s->pict_type != AV_PICTURE_TYPE_I)
2058  if(s->pict_type == AV_PICTURE_TYPE_B)
2060 
2061  if(get_bits_left(gb) < 3) {
2062  av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2063  return -1;
2064  }
2066  if(!s->progressive_sequence){
2067  s->top_field_first= get_bits1(gb);
2068  s->alternate_scan= get_bits1(gb);
2069  }else
2070  s->alternate_scan= 0;
2071  }
2072 
2073  if(s->alternate_scan){
2078  } else{
2083  }
2084 
2086  if(mpeg4_decode_sprite_trajectory(s, gb) < 0)
2087  return -1;
2088  if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
2089  if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2090  }
2091 
2092  if (s->shape != BIN_ONLY_SHAPE) {
2093  s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
2094  if(s->qscale==0){
2095  av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
2096  return -1; // makes no sense to continue, as there is nothing left from the image then
2097  }
2098 
2099  if (s->pict_type != AV_PICTURE_TYPE_I) {
2100  s->f_code = get_bits(gb, 3); /* fcode_for */
2101  if(s->f_code==0){
2102  av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
2103  s->f_code=1;
2104  return -1; // makes no sense to continue, as the MV decoding will break very quickly
2105  }
2106  }else
2107  s->f_code=1;
2108 
2109  if (s->pict_type == AV_PICTURE_TYPE_B) {
2110  s->b_code = get_bits(gb, 3);
2111  if(s->b_code==0){
2112  av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (b_code=0)\n");
2113  s->b_code=1;
2114  return -1; // makes no sense to continue, as the MV decoding will break very quickly
2115  }
2116  }else
2117  s->b_code=1;
2118 
2119  if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2120  av_log(s->avctx, AV_LOG_DEBUG, "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",
2121  s->qscale, s->f_code, s->b_code,
2122  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")),
2127  s->time,
2128  time_increment
2129  );
2130  }
2131 
2132  if(!s->scalability){
2133  if (s->shape!=RECT_SHAPE && s->pict_type!=AV_PICTURE_TYPE_I) {
2134  skip_bits1(gb); // vop shape coding type
2135  }
2136  }else{
2137  if(s->enhancement_type){
2138  int load_backward_shape= get_bits1(gb);
2139  if(load_backward_shape){
2140  av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
2141  }
2142  }
2143  skip_bits(gb, 2); //ref_select_code
2144  }
2145  }
2146  /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
2147  // note we cannot detect divx5 without b-frames easily (although it's buggy too)
2148  if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
2149  av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2150  s->low_delay=1;
2151  }
2152 
2153  s->picture_number++; // better than pic number==0 always ;)
2154 
2155  s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
2157 
2159  s->h_edge_pos= s->width;
2160  s->v_edge_pos= s->height;
2161  }
2162  return 0;
2163 }
2164 
2165 /**
2166  * Decode mpeg4 headers.
2167  * @return <0 if no VOP found (or a damaged one)
2168  * FRAME_SKIPPED if a not coded VOP is found
2169  * 0 if a VOP is found
2170  */
2172 {
2173  unsigned startcode, v;
2174 
2175  /* search next start code */
2176  align_get_bits(gb);
2177 
2178  if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
2179  skip_bits(gb, 24);
2180  if(get_bits(gb, 8) == 0xF0)
2181  goto end;
2182  }
2183 
2184  startcode = 0xff;
2185  for(;;) {
2186  if(get_bits_count(gb) >= gb->size_in_bits){
2187  if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0) || s->codec_tag == AV_RL32("QMP4")){
2188  av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2189  return FRAME_SKIPPED; //divx bug
2190  }else
2191  return -1; //end of stream
2192  }
2193 
2194  /* use the bits after the test */
2195  v = get_bits(gb, 8);
2196  startcode = ((startcode << 8) | v) & 0xffffffff;
2197 
2198  if((startcode&0xFFFFFF00) != 0x100)
2199  continue; //no startcode
2200 
2201  if(s->avctx->debug&FF_DEBUG_STARTCODE){
2202  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2203  if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2204  else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2205  else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2206  else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2207  else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2208  else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2209  else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2210  else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2211  else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2212  else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2213  else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2214  else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2215  else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2216  else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2217  else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2218  else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2219  else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2220  else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2221  else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2222  else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2223  else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2224  else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2225  else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2226  else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2227  else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2228  else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2229  else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
2230  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2231  }
2232 
2233  if(startcode >= 0x120 && startcode <= 0x12F){
2234  if(decode_vol_header(s, gb) < 0)
2235  return -1;
2236  }
2237  else if(startcode == USER_DATA_STARTCODE){
2238  decode_user_data(s, gb);
2239  }
2240  else if(startcode == GOP_STARTCODE){
2241  mpeg4_decode_gop_header(s, gb);
2242  }
2243  else if(startcode == VOS_STARTCODE){
2245  }
2246  else if(startcode == VOP_STARTCODE){
2247  break;
2248  }
2249 
2250  align_get_bits(gb);
2251  startcode = 0xff;
2252  }
2253 end:
2254  if(s->flags& CODEC_FLAG_LOW_DELAY)
2255  s->low_delay=1;
2256  s->avctx->has_b_frames= !s->low_delay;
2257  return decode_vop_header(s, gb);
2258 }
2259 
2261  static int done = 0;
2262 
2263  if (!done) {
2270  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2271  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2272  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2273  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2274  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2275  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2276  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2277  &ff_sprite_trajectory_tab[0][1], 4, 2,
2278  &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2279  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2280  &ff_mb_type_b_tab[0][1], 2, 1,
2281  &ff_mb_type_b_tab[0][0], 2, 1, 16);
2282  done = 1;
2283  }
2284 }
2285 
2287 {
2288  MpegEncContext *s = avctx->priv_data;
2289  int ret;
2290 
2291  s->divx_version=
2292  s->divx_build=
2293  s->xvid_build=
2294  s->lavc_build= -1;
2295 
2296  if((ret=ff_h263_decode_init(avctx)) < 0)
2297  return ret;
2298 
2300 
2301  s->h263_pred = 1;
2302  s->low_delay = 0; //default, might be overridden in the vol header during header parsing
2304  s->time_increment_bits = 4; /* default value for broken headers */
2306 
2307  avctx->internal->allocate_progress = 1;
2308 
2309  return 0;
2310 }
2311 
2313  { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2314  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2315  { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2316  { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2317  { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2318  { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2319  { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2320  { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2321  { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2322  { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2323  { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2324  { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2325  { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2326  { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2327  { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2328  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2329  { FF_PROFILE_UNKNOWN },
2330 };
2331 
2332 static const AVOption mpeg4_options[] = {
2333  {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2334  {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2335  {NULL}
2336 };
2337 
2338 static const AVClass mpeg4_class = {
2339  "MPEG4 Video Decoder",
2341  mpeg4_options,
2343 };
2344 
2345 static const AVClass mpeg4_vdpau_class = {
2346  "MPEG4 Video VDPAU Decoder",
2348  mpeg4_options,
2350 };
2351 
2353  .name = "mpeg4",
2354  .type = AVMEDIA_TYPE_VIDEO,
2355  .id = AV_CODEC_ID_MPEG4,
2356  .priv_data_size = sizeof(MpegEncContext),
2357  .init = decode_init,
2360  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2363  .flush = ff_mpeg_flush,
2364  .max_lowres = 3,
2365  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2366  .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2367  .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2368  .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context),
2369  .priv_class = &mpeg4_class,
2370 };
2371 
2372 
2373 #if CONFIG_MPEG4_VDPAU_DECODER
2374 AVCodec ff_mpeg4_vdpau_decoder = {
2375  .name = "mpeg4_vdpau",
2376  .type = AVMEDIA_TYPE_VIDEO,
2377  .id = AV_CODEC_ID_MPEG4,
2378  .priv_data_size = sizeof(MpegEncContext),
2379  .init = decode_init,
2382  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2384  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2385  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_MPEG4,
2386  AV_PIX_FMT_NONE },
2387  .priv_class = &mpeg4_vdpau_class,
2388 };
2389 #endif