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 Libav.
7  *
8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "mpegvideo.h"
24 #include "mpeg4video.h"
25 #include "h263.h"
26 #include "thread.h"
27 
28 // The defines below define the number of bits that are read at once for
29 // reading vlc values. Changing these may improve speed and data cache needs
30 // be aware though that decreasing them may need the number of stages that is
31 // passed to get_vlc* to be increased.
32 #define SPRITE_TRAJ_VLC_BITS 6
33 #define DC_VLC_BITS 9
34 #define MB_TYPE_B_VLC_BITS 4
35 
36 
40 
41 static const int mb_type_b_map[4]= {
46 };
47 
54  int dir)
55 {
56  int i;
57  int16_t *ac_val, *ac_val1;
58  int8_t * const qscale_table = s->current_picture.f.qscale_table;
59 
60  /* find prediction */
61  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
62  ac_val1 = ac_val;
63  if (s->ac_pred) {
64  if (dir == 0) {
65  const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
66  /* left prediction */
67  ac_val -= 16;
68 
69  if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
70  /* same qscale */
71  for(i=1;i<8;i++) {
72  block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
73  }
74  }else{
75  /* different qscale, we must rescale */
76  for(i=1;i<8;i++) {
77  block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
78  }
79  }
80  } else {
81  const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
82  /* top prediction */
83  ac_val -= 16 * s->block_wrap[n];
84 
85  if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
86  /* same qscale */
87  for(i=1;i<8;i++) {
88  block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
89  }
90  }else{
91  /* different qscale, we must rescale */
92  for(i=1;i<8;i++) {
93  block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
94  }
95  }
96  }
97  }
98  /* left copy */
99  for(i=1;i<8;i++)
100  ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
101 
102  /* top copy */
103  for(i=1;i<8;i++)
104  ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
105 
106 }
107 
112 static inline int mpeg4_is_resync(MpegEncContext *s){
113  int bits_count= get_bits_count(&s->gb);
114  int v= show_bits(&s->gb, 16);
115 
117  return 0;
118  }
119 
120  while(v<=0xFF){
121  if(s->pict_type==AV_PICTURE_TYPE_B || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
122  break;
123  skip_bits(&s->gb, 8+s->pict_type);
124  bits_count+= 8+s->pict_type;
125  v= show_bits(&s->gb, 16);
126  }
127 
128  if(bits_count + 8 >= s->gb.size_in_bits){
129  v>>=8;
130  v|= 0x7F >> (7-(bits_count&7));
131 
132  if(v==0x7F)
133  return 1;
134  }else{
135  if(v == ff_mpeg4_resync_prefix[bits_count&7]){
136  int len;
137  GetBitContext gb= s->gb;
138 
139  skip_bits(&s->gb, 1);
140  align_get_bits(&s->gb);
141 
142  for(len=0; len<32; len++){
143  if(get_bits1(&s->gb)) break;
144  }
145 
146  s->gb= gb;
147 
149  return 1;
150  }
151  }
152  return 0;
153 }
154 
156 {
157  int i;
158  int a= 2<<s->sprite_warping_accuracy;
159  int rho= 3-s->sprite_warping_accuracy;
160  int r=16/a;
161  const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
162  int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
163  int sprite_ref[4][2];
164  int virtual_ref[2][2];
165  int w2, h2, w3, h3;
166  int alpha=0, beta=0;
167  int w= s->width;
168  int h= s->height;
169  int min_ab;
170 
171  for(i=0; i<s->num_sprite_warping_points; i++){
172  int length;
173  int x=0, y=0;
174 
175  length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
176  if(length){
177  x= get_xbits(gb, length);
178  }
179  if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
180 
181  length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
182  if(length){
183  y=get_xbits(gb, length);
184  }
185  skip_bits1(gb); /* marker bit */
186  s->sprite_traj[i][0]= d[i][0]= x;
187  s->sprite_traj[i][1]= d[i][1]= y;
188  }
189  for(; i<4; i++)
190  s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
191 
192  while((1<<alpha)<w) alpha++;
193  while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
194  w2= 1<<alpha;
195  h2= 1<<beta;
196 
197 // Note, the 4th point isn't used for GMC
198  if(s->divx_version==500 && s->divx_build==413){
199  sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
200  sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
201  sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
202  sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
203  sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
204  sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
205  } else {
206  sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
207  sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
208  sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
209  sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
210  sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
211  sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
212  }
213 /* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
214  sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
215 
216 // this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
217 // perhaps it should be reordered to be more readable ...
218 // the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
219 // so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
220  virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
221  + 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);
222  virtual_ref[0][1]= 16*vop_ref[0][1]
223  + 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);
224  virtual_ref[1][0]= 16*vop_ref[0][0]
225  + 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);
226  virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
227  + 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);
228 
229  switch(s->num_sprite_warping_points)
230  {
231  case 0:
232  s->sprite_offset[0][0]= 0;
233  s->sprite_offset[0][1]= 0;
234  s->sprite_offset[1][0]= 0;
235  s->sprite_offset[1][1]= 0;
236  s->sprite_delta[0][0]= a;
237  s->sprite_delta[0][1]= 0;
238  s->sprite_delta[1][0]= 0;
239  s->sprite_delta[1][1]= a;
240  s->sprite_shift[0]= 0;
241  s->sprite_shift[1]= 0;
242  break;
243  case 1: //GMC only
244  s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
245  s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
246  s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
247  s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
248  s->sprite_delta[0][0]= a;
249  s->sprite_delta[0][1]= 0;
250  s->sprite_delta[1][0]= 0;
251  s->sprite_delta[1][1]= a;
252  s->sprite_shift[0]= 0;
253  s->sprite_shift[1]= 0;
254  break;
255  case 2:
256  s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
257  + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
258  + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
259  + (1<<(alpha+rho-1));
260  s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
261  + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
262  + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
263  + (1<<(alpha+rho-1));
264  s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
265  +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
266  +2*w2*r*sprite_ref[0][0]
267  - 16*w2
268  + (1<<(alpha+rho+1)));
269  s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
270  +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
271  +2*w2*r*sprite_ref[0][1]
272  - 16*w2
273  + (1<<(alpha+rho+1)));
274  s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
275  s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
276  s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
277  s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
278 
279  s->sprite_shift[0]= alpha+rho;
280  s->sprite_shift[1]= alpha+rho+2;
281  break;
282  case 3:
283  min_ab= FFMIN(alpha, beta);
284  w3= w2>>min_ab;
285  h3= h2>>min_ab;
286  s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
287  + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
288  + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
289  + (1<<(alpha+beta+rho-min_ab-1));
290  s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
291  + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
292  + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
293  + (1<<(alpha+beta+rho-min_ab-1));
294  s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
295  + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
296  + 2*w2*h3*r*sprite_ref[0][0]
297  - 16*w2*h3
298  + (1<<(alpha+beta+rho-min_ab+1));
299  s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
300  + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
301  + 2*w2*h3*r*sprite_ref[0][1]
302  - 16*w2*h3
303  + (1<<(alpha+beta+rho-min_ab+1));
304  s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
305  s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
306  s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
307  s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
308 
309  s->sprite_shift[0]= alpha + beta + rho - min_ab;
310  s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
311  break;
312  }
313  /* try to simplify the situation */
314  if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
315  && s->sprite_delta[0][1] == 0
316  && s->sprite_delta[1][0] == 0
317  && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
318  {
319  s->sprite_offset[0][0]>>=s->sprite_shift[0];
320  s->sprite_offset[0][1]>>=s->sprite_shift[0];
321  s->sprite_offset[1][0]>>=s->sprite_shift[1];
322  s->sprite_offset[1][1]>>=s->sprite_shift[1];
323  s->sprite_delta[0][0]= a;
324  s->sprite_delta[0][1]= 0;
325  s->sprite_delta[1][0]= 0;
326  s->sprite_delta[1][1]= a;
327  s->sprite_shift[0]= 0;
328  s->sprite_shift[1]= 0;
330  }
331  else{
332  int shift_y= 16 - s->sprite_shift[0];
333  int shift_c= 16 - s->sprite_shift[1];
334  for(i=0; i<2; i++){
335  s->sprite_offset[0][i]<<= shift_y;
336  s->sprite_offset[1][i]<<= shift_c;
337  s->sprite_delta[0][i]<<= shift_y;
338  s->sprite_delta[1][i]<<= shift_y;
339  s->sprite_shift[i]= 16;
340  }
342  }
343 }
344 
350 {
351  int mb_num_bits= av_log2(s->mb_num - 1) + 1;
352  int header_extension=0, mb_num, len;
353 
354  /* is there enough space left for a video packet + header */
355  if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
356 
357  for(len=0; len<32; len++){
358  if(get_bits1(&s->gb)) break;
359  }
360 
362  av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
363  return -1;
364  }
365 
366  if(s->shape != RECT_SHAPE){
367  header_extension= get_bits1(&s->gb);
368  //FIXME more stuff here
369  }
370 
371  mb_num= get_bits(&s->gb, mb_num_bits);
372  if(mb_num>=s->mb_num){
373  av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
374  return -1;
375  }
376  if(s->pict_type == AV_PICTURE_TYPE_B){
377  int mb_x = 0, mb_y = 0;
378 
379  while (s->next_picture.f.mbskip_table[s->mb_index2xy[mb_num]]) {
380  if (!mb_x) ff_thread_await_progress((AVFrame*)s->next_picture_ptr, mb_y++, 0);
381  mb_num++;
382  if (++mb_x == s->mb_width) mb_x = 0;
383  }
384  if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
385  }
386 
387  s->mb_x= mb_num % s->mb_width;
388  s->mb_y= mb_num / s->mb_width;
389 
390  if(s->shape != BIN_ONLY_SHAPE){
391  int qscale= get_bits(&s->gb, s->quant_precision);
392  if(qscale)
393  s->chroma_qscale=s->qscale= qscale;
394  }
395 
396  if(s->shape == RECT_SHAPE){
397  header_extension= get_bits1(&s->gb);
398  }
399  if(header_extension){
400  int time_incr=0;
401 
402  while (get_bits1(&s->gb) != 0)
403  time_incr++;
404 
405  check_marker(&s->gb, "before time_increment in video packed header");
406  skip_bits(&s->gb, s->time_increment_bits); /* time_increment */
407  check_marker(&s->gb, "before vop_coding_type in video packed header");
408 
409  skip_bits(&s->gb, 2); /* vop coding type */
410  //FIXME not rect stuff here
411 
412  if(s->shape != BIN_ONLY_SHAPE){
413  skip_bits(&s->gb, 3); /* intra dc vlc threshold */
414 //FIXME don't just ignore everything
417  av_log(s->avctx, AV_LOG_ERROR, "untested\n");
418  }
419 
420  //FIXME reduced res stuff here
421 
422  if (s->pict_type != AV_PICTURE_TYPE_I) {
423  int f_code = get_bits(&s->gb, 3); /* fcode_for */
424  if(f_code==0){
425  av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
426  }
427  }
428  if (s->pict_type == AV_PICTURE_TYPE_B) {
429  int b_code = get_bits(&s->gb, 3);
430  if(b_code==0){
431  av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
432  }
433  }
434  }
435  }
436  //FIXME new-pred stuff
437 
438  return 0;
439 }
440 
446 static inline int get_amv(MpegEncContext *s, int n){
447  int x, y, mb_v, sum, dx, dy, shift;
448  int len = 1 << (s->f_code + 4);
449  const int a= s->sprite_warping_accuracy;
450 
451  if(s->workaround_bugs & FF_BUG_AMV)
452  len >>= s->quarter_sample;
453 
454  if(s->real_sprite_warping_points==1){
455  if(s->divx_version==500 && s->divx_build==413)
456  sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
457  else
458  sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
459  }else{
460  dx= s->sprite_delta[n][0];
461  dy= s->sprite_delta[n][1];
462  shift= s->sprite_shift[0];
463  if(n) dy -= 1<<(shift + a + 1);
464  else dx -= 1<<(shift + a + 1);
465  mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
466 
467  sum=0;
468  for(y=0; y<16; y++){
469  int v;
470 
471  v= mb_v + dy*y;
472  //XXX FIXME optimize
473  for(x=0; x<16; x++){
474  sum+= v>>shift;
475  v+= dx;
476  }
477  }
478  sum= RSHIFT(sum, a+8-s->quarter_sample);
479  }
480 
481  if (sum < -len) sum= -len;
482  else if (sum >= len) sum= len-1;
483 
484  return sum;
485 }
486 
493 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
494 {
495  int level, code;
496 
497  if (n < 4)
498  code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
499  else
500  code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
501  if (code < 0 || code > 9 /* && s->nbit<9 */){
502  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
503  return -1;
504  }
505  if (code == 0) {
506  level = 0;
507  } else {
508  if(IS_3IV1){
509  if(code==1)
510  level= 2*get_bits1(&s->gb)-1;
511  else{
512  if(get_bits1(&s->gb))
513  level = get_bits(&s->gb, code-1) + (1<<(code-1));
514  else
515  level = -get_bits(&s->gb, code-1) - (1<<(code-1));
516  }
517  }else{
518  level = get_xbits(&s->gb, code);
519  }
520 
521  if (code > 8){
522  if(get_bits1(&s->gb)==0){ /* marker */
524  av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
525  return -1;
526  }
527  }
528  }
529  }
530 
531  return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
532 }
533 
539  int mb_num;
540  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
541 
542  /* decode first partition */
543  mb_num=0;
544  s->first_slice_line=1;
545  for(; s->mb_y<s->mb_height; s->mb_y++){
547  for(; s->mb_x<s->mb_width; s->mb_x++){
548  const int xy= s->mb_x + s->mb_y*s->mb_stride;
549  int cbpc;
550  int dir=0;
551 
552  mb_num++;
554  if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
555  s->first_slice_line=0;
556 
558  int i;
559 
560  do{
561  if(show_bits_long(&s->gb, 19)==DC_MARKER){
562  return mb_num-1;
563  }
564 
566  if (cbpc < 0){
567  av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
568  return -1;
569  }
570  }while(cbpc == 8);
571 
572  s->cbp_table[xy]= cbpc & 3;
574  s->mb_intra = 1;
575 
576  if(cbpc & 4) {
577  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
578  }
580 
581  s->mbintra_table[xy]= 1;
582  for(i=0; i<6; i++){
583  int dc_pred_dir;
584  int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
585  if(dc < 0){
586  av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
587  return -1;
588  }
589  dir<<=1;
590  if(dc_pred_dir) dir|=1;
591  }
592  s->pred_dir_table[xy]= dir;
593  }else{ /* P/S_TYPE */
594  int mx, my, pred_x, pred_y, bits;
595  int16_t * const mot_val = s->current_picture.f.motion_val[0][s->block_index[0]];
596  const int stride= s->b8_stride*2;
597 
598 try_again:
599  bits= show_bits(&s->gb, 17);
600  if(bits==MOTION_MARKER){
601  return mb_num-1;
602  }
603  skip_bits1(&s->gb);
604  if(bits&0x10000){
605  /* skip mb */
608  mx= get_amv(s, 0);
609  my= get_amv(s, 1);
610  }else{
612  mx=my=0;
613  }
614  mot_val[0 ]= mot_val[2 ]=
615  mot_val[0+stride]= mot_val[2+stride]= mx;
616  mot_val[1 ]= mot_val[3 ]=
617  mot_val[1+stride]= mot_val[3+stride]= my;
618 
619  if(s->mbintra_table[xy])
621  continue;
622  }
623 
625  if (cbpc < 0){
626  av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
627  return -1;
628  }
629  if(cbpc == 20)
630  goto try_again;
631 
632  s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
633 
634  s->mb_intra = ((cbpc & 4) != 0);
635 
636  if(s->mb_intra){
638  s->mbintra_table[xy]= 1;
639  mot_val[0 ]= mot_val[2 ]=
640  mot_val[0+stride]= mot_val[2+stride]= 0;
641  mot_val[1 ]= mot_val[3 ]=
642  mot_val[1+stride]= mot_val[3+stride]= 0;
643  }else{
644  if(s->mbintra_table[xy])
646 
647  if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
648  s->mcsel= get_bits1(&s->gb);
649  else s->mcsel= 0;
650 
651  if ((cbpc & 16) == 0) {
652  /* 16x16 motion prediction */
653 
654  h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
655  if(!s->mcsel){
656  mx = h263_decode_motion(s, pred_x, s->f_code);
657  if (mx >= 0xffff)
658  return -1;
659 
660  my = h263_decode_motion(s, pred_y, s->f_code);
661  if (my >= 0xffff)
662  return -1;
664  } else {
665  mx = get_amv(s, 0);
666  my = get_amv(s, 1);
668  }
669 
670  mot_val[0 ]= mot_val[2 ] =
671  mot_val[0+stride]= mot_val[2+stride]= mx;
672  mot_val[1 ]= mot_val[3 ]=
673  mot_val[1+stride]= mot_val[3+stride]= my;
674  } else {
675  int i;
677  for(i=0;i<4;i++) {
678  int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
679  mx = h263_decode_motion(s, pred_x, s->f_code);
680  if (mx >= 0xffff)
681  return -1;
682 
683  my = h263_decode_motion(s, pred_y, s->f_code);
684  if (my >= 0xffff)
685  return -1;
686  mot_val[0] = mx;
687  mot_val[1] = my;
688  }
689  }
690  }
691  }
692  }
693  s->mb_x= 0;
694  }
695 
696  return mb_num;
697 }
698 
703 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
704  int mb_num=0;
705  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
706 
707  s->mb_x= s->resync_mb_x;
708  s->first_slice_line=1;
709  for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
711  for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
712  const int xy= s->mb_x + s->mb_y*s->mb_stride;
713 
714  mb_num++;
716  if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
717  s->first_slice_line=0;
718 
720  int ac_pred= get_bits1(&s->gb);
721  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
722  if(cbpy<0){
723  av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
724  return -1;
725  }
726 
727  s->cbp_table[xy]|= cbpy<<2;
728  s->current_picture.f.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
729  }else{ /* P || S_TYPE */
730  if (IS_INTRA(s->current_picture.f.mb_type[xy])) {
731  int dir=0,i;
732  int ac_pred = get_bits1(&s->gb);
733  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
734 
735  if(cbpy<0){
736  av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
737  return -1;
738  }
739 
740  if(s->cbp_table[xy] & 8) {
741  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
742  }
743  s->current_picture.f.qscale_table[xy] = s->qscale;
744 
745  for(i=0; i<6; i++){
746  int dc_pred_dir;
747  int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
748  if(dc < 0){
749  av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
750  return -1;
751  }
752  dir<<=1;
753  if(dc_pred_dir) dir|=1;
754  }
755  s->cbp_table[xy]&= 3; //remove dquant
756  s->cbp_table[xy]|= cbpy<<2;
757  s->current_picture.f.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
758  s->pred_dir_table[xy]= dir;
759  } else if (IS_SKIP(s->current_picture.f.mb_type[xy])) {
760  s->current_picture.f.qscale_table[xy] = s->qscale;
761  s->cbp_table[xy]= 0;
762  }else{
763  int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
764 
765  if(cbpy<0){
766  av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
767  return -1;
768  }
769 
770  if(s->cbp_table[xy] & 8) {
771  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
772  }
773  s->current_picture.f.qscale_table[xy] = s->qscale;
774 
775  s->cbp_table[xy]&= 3; //remove dquant
776  s->cbp_table[xy]|= (cbpy^0xf)<<2;
777  }
778  }
779  }
780  if(mb_num >= mb_count) return 0;
781  s->mb_x= 0;
782  }
783  return 0;
784 }
785 
791 {
792  int mb_num;
793  const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_ERROR|ER_MV_ERROR) : ER_MV_ERROR;
794  const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_END |ER_MV_END) : ER_MV_END;
795 
796  mb_num= mpeg4_decode_partition_a(s);
797  if(mb_num<0){
798  ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
799  return -1;
800  }
801 
802  if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
803  av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
804  ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
805  return -1;
806  }
807 
808  s->mb_num_left= mb_num;
809 
811  while(show_bits(&s->gb, 9) == 1)
812  skip_bits(&s->gb, 9);
813  if(get_bits_long(&s->gb, 19)!=DC_MARKER){
814  av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
815  return -1;
816  }
817  }else{
818  while(show_bits(&s->gb, 10) == 1)
819  skip_bits(&s->gb, 10);
820  if(get_bits(&s->gb, 17)!=MOTION_MARKER){
821  av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
822  return -1;
823  }
824  }
825  ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
826 
827  if( mpeg4_decode_partition_b(s, mb_num) < 0){
830  return -1;
831  }else{
834  }
835 
836  return 0;
837 }
838 
844  int n, int coded, int intra, int rvlc)
845 {
846  int level, i, last, run;
847  int dc_pred_dir;
848  RLTable * rl;
849  RL_VLC_ELEM * rl_vlc;
850  const uint8_t * scan_table;
851  int qmul, qadd;
852 
853  //Note intra & rvlc should be optimized away if this is inlined
854 
855  if(intra) {
856  if(s->use_intra_dc_vlc){
857  /* DC coef */
858  if(s->partitioned_frame){
859  level = s->dc_val[0][ s->block_index[n] ];
860  if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
861  else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
862  dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
863  }else{
864  level = mpeg4_decode_dc(s, n, &dc_pred_dir);
865  if (level < 0)
866  return -1;
867  }
868  block[0] = level;
869  i = 0;
870  }else{
871  i = -1;
872  ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
873  }
874  if (!coded)
875  goto not_coded;
876 
877  if(rvlc){
878  rl = &rvlc_rl_intra;
879  rl_vlc = rvlc_rl_intra.rl_vlc[0];
880  }else{
881  rl = &ff_mpeg4_rl_intra;
882  rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
883  }
884  if (s->ac_pred) {
885  if (dc_pred_dir == 0)
886  scan_table = s->intra_v_scantable.permutated; /* left */
887  else
888  scan_table = s->intra_h_scantable.permutated; /* top */
889  } else {
890  scan_table = s->intra_scantable.permutated;
891  }
892  qmul=1;
893  qadd=0;
894  } else {
895  i = -1;
896  if (!coded) {
897  s->block_last_index[n] = i;
898  return 0;
899  }
900  if(rvlc) rl = &rvlc_rl_inter;
901  else rl = &ff_h263_rl_inter;
902 
903  scan_table = s->intra_scantable.permutated;
904 
905  if(s->mpeg_quant){
906  qmul=1;
907  qadd=0;
908  if(rvlc){
909  rl_vlc = rvlc_rl_inter.rl_vlc[0];
910  }else{
911  rl_vlc = ff_h263_rl_inter.rl_vlc[0];
912  }
913  }else{
914  qmul = s->qscale << 1;
915  qadd = (s->qscale - 1) | 1;
916  if(rvlc){
917  rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
918  }else{
919  rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
920  }
921  }
922  }
923  {
924  OPEN_READER(re, &s->gb);
925  for(;;) {
926  UPDATE_CACHE(re, &s->gb);
927  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
928  if (level==0) {
929  /* escape */
930  if(rvlc){
931  if(SHOW_UBITS(re, &s->gb, 1)==0){
932  av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
933  return -1;
934  }; SKIP_CACHE(re, &s->gb, 1);
935 
936  last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
937  run= SHOW_UBITS(re, &s->gb, 6);
938  SKIP_COUNTER(re, &s->gb, 1+1+6);
939  UPDATE_CACHE(re, &s->gb);
940 
941  if(SHOW_UBITS(re, &s->gb, 1)==0){
942  av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
943  return -1;
944  }; SKIP_CACHE(re, &s->gb, 1);
945 
946  level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
947 
948  if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
949  av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
950  return -1;
951  }; SKIP_CACHE(re, &s->gb, 5);
952 
953  level= level * qmul + qadd;
954  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
955  SKIP_COUNTER(re, &s->gb, 1+11+5+1);
956 
957  i+= run + 1;
958  if(last) i+=192;
959  }else{
960  int cache;
961  cache= GET_CACHE(re, &s->gb);
962 
963  if(IS_3IV1)
964  cache ^= 0xC0000000;
965 
966  if (cache&0x80000000) {
967  if (cache&0x40000000) {
968  /* third escape */
969  SKIP_CACHE(re, &s->gb, 2);
970  last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
971  run= SHOW_UBITS(re, &s->gb, 6);
972  SKIP_COUNTER(re, &s->gb, 2+1+6);
973  UPDATE_CACHE(re, &s->gb);
974 
975  if(IS_3IV1){
976  level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
977  }else{
978  if(SHOW_UBITS(re, &s->gb, 1)==0){
979  av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
980  return -1;
981  }; SKIP_CACHE(re, &s->gb, 1);
982 
983  level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
984 
985  if(SHOW_UBITS(re, &s->gb, 1)==0){
986  av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
987  return -1;
988  }
989 
990  SKIP_COUNTER(re, &s->gb, 1+12+1);
991  }
992 
993  if (level>0) level= level * qmul + qadd;
994  else level= level * qmul - qadd;
995 
996  if((unsigned)(level + 2048) > 4095){
998  if(level > 2560 || level<-2560){
999  av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
1000  return -1;
1001  }
1002  }
1003  level= level<0 ? -2048 : 2047;
1004  }
1005 
1006  i+= run + 1;
1007  if(last) i+=192;
1008  } else {
1009  /* second escape */
1010  SKIP_BITS(re, &s->gb, 2);
1011  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1012  i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
1013  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1014  LAST_SKIP_BITS(re, &s->gb, 1);
1015  }
1016  } else {
1017  /* first escape */
1018  SKIP_BITS(re, &s->gb, 1);
1019  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1020  i+= run;
1021  level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1022  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1023  LAST_SKIP_BITS(re, &s->gb, 1);
1024  }
1025  }
1026  } else {
1027  i+= run;
1028  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1029  LAST_SKIP_BITS(re, &s->gb, 1);
1030  }
1031  if (i > 62){
1032  i-= 192;
1033  if(i&(~63)){
1034  av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1035  return -1;
1036  }
1037 
1038  block[scan_table[i]] = level;
1039  break;
1040  }
1041 
1042  block[scan_table[i]] = level;
1043  }
1044  CLOSE_READER(re, &s->gb);
1045  }
1046  not_coded:
1047  if (intra) {
1048  if(!s->use_intra_dc_vlc){
1049  block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1050 
1051  i -= i>>31; //if(i == -1) i=0;
1052  }
1053 
1054  mpeg4_pred_ac(s, block, n, dc_pred_dir);
1055  if (s->ac_pred) {
1056  i = 63; /* XXX: not optimal */
1057  }
1058  }
1059  s->block_last_index[n] = i;
1060  return 0;
1061 }
1062 
1068 {
1069  int cbp, mb_type;
1070  const int xy= s->mb_x + s->mb_y*s->mb_stride;
1071 
1072  mb_type = s->current_picture.f.mb_type[xy];
1073  cbp = s->cbp_table[xy];
1074 
1076 
1077  if (s->current_picture.f.qscale_table[xy] != s->qscale) {
1079  }
1080 
1082  int i;
1083  for(i=0; i<4; i++){
1084  s->mv[0][i][0] = s->current_picture.f.motion_val[0][s->block_index[i]][0];
1085  s->mv[0][i][1] = s->current_picture.f.motion_val[0][s->block_index[i]][1];
1086  }
1087  s->mb_intra = IS_INTRA(mb_type);
1088 
1089  if (IS_SKIP(mb_type)) {
1090  /* skip mb */
1091  for(i=0;i<6;i++)
1092  s->block_last_index[i] = -1;
1093  s->mv_dir = MV_DIR_FORWARD;
1094  s->mv_type = MV_TYPE_16X16;
1096  s->mcsel=1;
1097  s->mb_skipped = 0;
1098  }else{
1099  s->mcsel=0;
1100  s->mb_skipped = 1;
1101  }
1102  }else if(s->mb_intra){
1103  s->ac_pred = IS_ACPRED(s->current_picture.f.mb_type[xy]);
1104  }else if(!s->mb_intra){
1105 // s->mcsel= 0; //FIXME do we need to init that
1106 
1107  s->mv_dir = MV_DIR_FORWARD;
1108  if (IS_8X8(mb_type)) {
1109  s->mv_type = MV_TYPE_8X8;
1110  } else {
1111  s->mv_type = MV_TYPE_16X16;
1112  }
1113  }
1114  } else { /* I-Frame */
1115  s->mb_intra = 1;
1116  s->ac_pred = IS_ACPRED(s->current_picture.f.mb_type[xy]);
1117  }
1118 
1119  if (!IS_SKIP(mb_type)) {
1120  int i;
1121  s->dsp.clear_blocks(s->block[0]);
1122  /* decode each block */
1123  for (i = 0; i < 6; i++) {
1124  if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
1125  av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
1126  return -1;
1127  }
1128  cbp+=cbp;
1129  }
1130  }
1131 
1132  /* per-MB end of slice check */
1133 
1134  if(--s->mb_num_left <= 0){
1135  if(mpeg4_is_resync(s))
1136  return SLICE_END;
1137  else
1138  return SLICE_NOEND;
1139  }else{
1140  if(mpeg4_is_resync(s)){
1141  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1142  if(s->cbp_table[xy+delta])
1143  return SLICE_END;
1144  }
1145  return SLICE_OK;
1146  }
1147 }
1148 
1150  DCTELEM block[6][64])
1151 {
1152  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1153  int16_t *mot_val;
1154  static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1155  const int xy= s->mb_x + s->mb_y * s->mb_stride;
1156 
1157  assert(s->h263_pred);
1158 
1160  do{
1161  if (get_bits1(&s->gb)) {
1162  /* skip mb */
1163  s->mb_intra = 0;
1164  for(i=0;i<6;i++)
1165  s->block_last_index[i] = -1;
1166  s->mv_dir = MV_DIR_FORWARD;
1167  s->mv_type = MV_TYPE_16X16;
1170  s->mcsel=1;
1171  s->mv[0][0][0]= get_amv(s, 0);
1172  s->mv[0][0][1]= get_amv(s, 1);
1173 
1174  s->mb_skipped = 0;
1175  }else{
1177  s->mcsel=0;
1178  s->mv[0][0][0] = 0;
1179  s->mv[0][0][1] = 0;
1180  s->mb_skipped = 1;
1181  }
1182  goto end;
1183  }
1185  if (cbpc < 0){
1186  av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1187  return -1;
1188  }
1189  }while(cbpc == 20);
1190 
1191  s->dsp.clear_blocks(s->block[0]);
1192  dquant = cbpc & 8;
1193  s->mb_intra = ((cbpc & 4) != 0);
1194  if (s->mb_intra) goto intra;
1195 
1196  if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
1197  s->mcsel= get_bits1(&s->gb);
1198  else s->mcsel= 0;
1199  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1200 
1201  cbp = (cbpc & 3) | (cbpy << 2);
1202  if (dquant) {
1203  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1204  }
1205  if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
1206  s->interlaced_dct= get_bits1(&s->gb);
1207 
1208  s->mv_dir = MV_DIR_FORWARD;
1209  if ((cbpc & 16) == 0) {
1210  if(s->mcsel){
1212  /* 16x16 global motion prediction */
1213  s->mv_type = MV_TYPE_16X16;
1214  mx= get_amv(s, 0);
1215  my= get_amv(s, 1);
1216  s->mv[0][0][0] = mx;
1217  s->mv[0][0][1] = my;
1218  }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
1220  /* 16x8 field motion prediction */
1221  s->mv_type= MV_TYPE_FIELD;
1222 
1223  s->field_select[0][0]= get_bits1(&s->gb);
1224  s->field_select[0][1]= get_bits1(&s->gb);
1225 
1226  h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1227 
1228  for(i=0; i<2; i++){
1229  mx = h263_decode_motion(s, pred_x, s->f_code);
1230  if (mx >= 0xffff)
1231  return -1;
1232 
1233  my = h263_decode_motion(s, pred_y/2, s->f_code);
1234  if (my >= 0xffff)
1235  return -1;
1236 
1237  s->mv[0][i][0] = mx;
1238  s->mv[0][i][1] = my;
1239  }
1240  }else{
1242  /* 16x16 motion prediction */
1243  s->mv_type = MV_TYPE_16X16;
1244  h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1245  mx = h263_decode_motion(s, pred_x, s->f_code);
1246 
1247  if (mx >= 0xffff)
1248  return -1;
1249 
1250  my = h263_decode_motion(s, pred_y, s->f_code);
1251 
1252  if (my >= 0xffff)
1253  return -1;
1254  s->mv[0][0][0] = mx;
1255  s->mv[0][0][1] = my;
1256  }
1257  } else {
1259  s->mv_type = MV_TYPE_8X8;
1260  for(i=0;i<4;i++) {
1261  mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1262  mx = h263_decode_motion(s, pred_x, s->f_code);
1263  if (mx >= 0xffff)
1264  return -1;
1265 
1266  my = h263_decode_motion(s, pred_y, s->f_code);
1267  if (my >= 0xffff)
1268  return -1;
1269  s->mv[0][i][0] = mx;
1270  s->mv[0][i][1] = my;
1271  mot_val[0] = mx;
1272  mot_val[1] = my;
1273  }
1274  }
1275  } else if(s->pict_type==AV_PICTURE_TYPE_B) {
1276  int modb1; // first bit of modb
1277  int modb2; // second bit of modb
1278  int mb_type;
1279 
1280  s->mb_intra = 0; //B-frames never contain intra blocks
1281  s->mcsel=0; // ... true gmc blocks
1282 
1283  if(s->mb_x==0){
1284  for(i=0; i<2; i++){
1285  s->last_mv[i][0][0]=
1286  s->last_mv[i][0][1]=
1287  s->last_mv[i][1][0]=
1288  s->last_mv[i][1][1]= 0;
1289  }
1290 
1292  }
1293 
1294  /* if we skipped it in the future P Frame than skip it now too */
1295  s->mb_skipped = s->next_picture.f.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1296 
1297  if(s->mb_skipped){
1298  /* skip mb */
1299  for(i=0;i<6;i++)
1300  s->block_last_index[i] = -1;
1301 
1302  s->mv_dir = MV_DIR_FORWARD;
1303  s->mv_type = MV_TYPE_16X16;
1304  s->mv[0][0][0] = 0;
1305  s->mv[0][0][1] = 0;
1306  s->mv[1][0][0] = 0;
1307  s->mv[1][0][1] = 0;
1309  goto end;
1310  }
1311 
1312  modb1= get_bits1(&s->gb);
1313  if(modb1){
1314  mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
1315  cbp=0;
1316  }else{
1317  modb2= get_bits1(&s->gb);
1318  mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1319  if(mb_type<0){
1320  av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1321  return -1;
1322  }
1323  mb_type= mb_type_b_map[ mb_type ];
1324  if(modb2) cbp= 0;
1325  else{
1326  s->dsp.clear_blocks(s->block[0]);
1327  cbp= get_bits(&s->gb, 6);
1328  }
1329 
1330  if ((!IS_DIRECT(mb_type)) && cbp) {
1331  if(get_bits1(&s->gb)){
1332  ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
1333  }
1334  }
1335 
1336  if(!s->progressive_sequence){
1337  if(cbp)
1338  s->interlaced_dct= get_bits1(&s->gb);
1339 
1340  if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
1341  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1342  mb_type &= ~MB_TYPE_16x16;
1343 
1344  if(USES_LIST(mb_type, 0)){
1345  s->field_select[0][0]= get_bits1(&s->gb);
1346  s->field_select[0][1]= get_bits1(&s->gb);
1347  }
1348  if(USES_LIST(mb_type, 1)){
1349  s->field_select[1][0]= get_bits1(&s->gb);
1350  s->field_select[1][1]= get_bits1(&s->gb);
1351  }
1352  }
1353  }
1354 
1355  s->mv_dir = 0;
1356  if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
1357  s->mv_type= MV_TYPE_16X16;
1358 
1359  if(USES_LIST(mb_type, 0)){
1360  s->mv_dir = MV_DIR_FORWARD;
1361 
1362  mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1363  my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1364  s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
1365  s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
1366  }
1367 
1368  if(USES_LIST(mb_type, 1)){
1369  s->mv_dir |= MV_DIR_BACKWARD;
1370 
1371  mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1372  my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1373  s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
1374  s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
1375  }
1376  }else if(!IS_DIRECT(mb_type)){
1377  s->mv_type= MV_TYPE_FIELD;
1378 
1379  if(USES_LIST(mb_type, 0)){
1380  s->mv_dir = MV_DIR_FORWARD;
1381 
1382  for(i=0; i<2; i++){
1383  mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
1384  my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
1385  s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
1386  s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
1387  }
1388  }
1389 
1390  if(USES_LIST(mb_type, 1)){
1391  s->mv_dir |= MV_DIR_BACKWARD;
1392 
1393  for(i=0; i<2; i++){
1394  mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
1395  my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
1396  s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
1397  s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
1398  }
1399  }
1400  }
1401  }
1402 
1403  if(IS_DIRECT(mb_type)){
1404  if(IS_SKIP(mb_type))
1405  mx=my=0;
1406  else{
1407  mx = h263_decode_motion(s, 0, 1);
1408  my = h263_decode_motion(s, 0, 1);
1409  }
1410 
1412  mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1413  }
1414  s->current_picture.f.mb_type[xy] = mb_type;
1415  } else { /* I-Frame */
1416  do{
1418  if (cbpc < 0){
1419  av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1420  return -1;
1421  }
1422  }while(cbpc == 8);
1423 
1424  dquant = cbpc & 4;
1425  s->mb_intra = 1;
1426 intra:
1427  s->ac_pred = get_bits1(&s->gb);
1428  if(s->ac_pred)
1430  else
1432 
1433  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1434  if(cbpy<0){
1435  av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1436  return -1;
1437  }
1438  cbp = (cbpc & 3) | (cbpy << 2);
1439 
1441 
1442  if (dquant) {
1443  ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1444  }
1445 
1446  if(!s->progressive_sequence)
1447  s->interlaced_dct= get_bits1(&s->gb);
1448 
1449  s->dsp.clear_blocks(s->block[0]);
1450  /* decode each block */
1451  for (i = 0; i < 6; i++) {
1452  if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
1453  return -1;
1454  cbp+=cbp;
1455  }
1456  goto end;
1457  }
1458 
1459  /* decode each block */
1460  for (i = 0; i < 6; i++) {
1461  if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
1462  return -1;
1463  cbp+=cbp;
1464  }
1465 end:
1466 
1467  /* per-MB end of slice check */
1468  if(s->codec_id==CODEC_ID_MPEG4){
1469  if(mpeg4_is_resync(s)){
1470  const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1471 
1472  if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.f.mbskip_table[xy + delta]) {
1474  (s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y+1, s->mb_height-1) : s->mb_y, 0);
1475  }
1476 
1477  if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.f.mbskip_table[xy + delta])
1478  return SLICE_OK;
1479  return SLICE_END;
1480  }
1481  }
1482 
1483  return SLICE_OK;
1484 }
1485 
1486 
1488  int hours, minutes, seconds;
1489  unsigned time_code = show_bits(gb, 18);
1490 
1491  if (time_code & 0x40) { /* marker_bit */
1492  hours = time_code >> 13;
1493  minutes = time_code >> 7 & 0x3f;
1494  seconds = time_code & 0x3f;
1495  s->time_base = seconds + 60*(minutes + 60*hours);
1496  skip_bits(gb, 20); /* time_code, closed_gov, broken_link */
1497  } else {
1498  av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n");
1499  }
1500 
1501  return 0;
1502 }
1503 
1505  int profile_and_level_indication;
1506 
1507  profile_and_level_indication = get_bits(gb, 8);
1508 
1509  s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4;
1510  s->avctx->level = (profile_and_level_indication & 0x0f);
1511 
1512  // for Simple profile, level 0
1513  if (s->avctx->profile == 0 && s->avctx->level == 8) {
1514  s->avctx->level = 0;
1515  }
1516 
1517  return 0;
1518 }
1519 
1521  int width, height, vo_ver_id;
1522 
1523  /* vol header */
1524  skip_bits(gb, 1); /* random access */
1525  s->vo_type= get_bits(gb, 8);
1526  if (get_bits1(gb) != 0) { /* is_ol_id */
1527  vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1528  skip_bits(gb, 3); /* vo_priority */
1529  } else {
1530  vo_ver_id = 1;
1531  }
1532  s->aspect_ratio_info= get_bits(gb, 4);
1534  s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
1535  s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
1536  }else{
1538  }
1539 
1540  if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
1541  int chroma_format= get_bits(gb, 2);
1542  if(chroma_format!=CHROMA_420){
1543  av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1544  }
1545  s->low_delay= get_bits1(gb);
1546  if(get_bits1(gb)){ /* vbv parameters */
1547  get_bits(gb, 15); /* first_half_bitrate */
1548  skip_bits1(gb); /* marker */
1549  get_bits(gb, 15); /* latter_half_bitrate */
1550  skip_bits1(gb); /* marker */
1551  get_bits(gb, 15); /* first_half_vbv_buffer_size */
1552  skip_bits1(gb); /* marker */
1553  get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1554  get_bits(gb, 11); /* first_half_vbv_occupancy */
1555  skip_bits1(gb); /* marker */
1556  get_bits(gb, 15); /* latter_half_vbv_occupancy */
1557  skip_bits1(gb); /* marker */
1558  }
1559  }else{
1560  // set low delay flag only once the smartest? low delay detection won't be overriden
1561  if(s->picture_number==0)
1562  s->low_delay=0;
1563  }
1564 
1565  s->shape = get_bits(gb, 2); /* vol shape */
1566  if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1567  if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
1568  av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1569  skip_bits(gb, 4); //video_object_layer_shape_extension
1570  }
1571 
1572  check_marker(gb, "before time_increment_resolution");
1573 
1574  s->avctx->time_base.den = get_bits(gb, 16);
1575  if(!s->avctx->time_base.den){
1576  av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1577  s->avctx->time_base.num = 0;
1578  return -1;
1579  }
1580 
1581  s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1582  if (s->time_increment_bits < 1)
1583  s->time_increment_bits = 1;
1584 
1585  check_marker(gb, "before fixed_vop_rate");
1586 
1587  if (get_bits1(gb) != 0) { /* fixed_vop_rate */
1589  }else
1590  s->avctx->time_base.num = 1;
1591 
1592  s->t_frame=0;
1593 
1594  if (s->shape != BIN_ONLY_SHAPE) {
1595  if (s->shape == RECT_SHAPE) {
1596  skip_bits1(gb); /* marker */
1597  width = get_bits(gb, 13);
1598  skip_bits1(gb); /* marker */
1599  height = get_bits(gb, 13);
1600  skip_bits1(gb); /* marker */
1601  if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
1602  s->width = width;
1603  s->height = height;
1604  }
1605  }
1606 
1608  s->progressive_frame= get_bits1(gb)^1;
1609  s->interlaced_dct=0;
1610  if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1611  av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
1612  if (vo_ver_id == 1) {
1613  s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1614  } else {
1615  s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1616  }
1617  if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1620  s->sprite_width = get_bits(gb, 13);
1621  skip_bits1(gb); /* marker */
1622  s->sprite_height= get_bits(gb, 13);
1623  skip_bits1(gb); /* marker */
1624  s->sprite_left = get_bits(gb, 13);
1625  skip_bits1(gb); /* marker */
1626  s->sprite_top = get_bits(gb, 13);
1627  skip_bits1(gb); /* marker */
1628  }
1630  if(s->num_sprite_warping_points > 3){
1631  av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
1633  return -1;
1634  }
1635  s->sprite_warping_accuracy = get_bits(gb, 2);
1638  s->low_latency_sprite= get_bits1(gb);
1639  }
1640  // FIXME sadct disable bit if verid!=1 && shape not rect
1641 
1642  if (get_bits1(gb) == 1) { /* not_8_bit */
1643  s->quant_precision = get_bits(gb, 4); /* quant_precision */
1644  if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
1645  if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
1646  } else {
1647  s->quant_precision = 5;
1648  }
1649 
1650  // FIXME a bunch of grayscale shape things
1651 
1652  if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
1653  int i, v;
1654 
1655  /* load default matrixes */
1656  for(i=0; i<64; i++){
1657  int j= s->dsp.idct_permutation[i];
1659  s->intra_matrix[j]= v;
1660  s->chroma_intra_matrix[j]= v;
1661 
1663  s->inter_matrix[j]= v;
1664  s->chroma_inter_matrix[j]= v;
1665  }
1666 
1667  /* load custom intra matrix */
1668  if(get_bits1(gb)){
1669  int last=0;
1670  for(i=0; i<64; i++){
1671  int j;
1672  v= get_bits(gb, 8);
1673  if(v==0) break;
1674 
1675  last= v;
1677  s->intra_matrix[j]= v;
1678  s->chroma_intra_matrix[j]= v;
1679  }
1680 
1681  /* replicate last value */
1682  for(; i<64; i++){
1683  int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1684  s->intra_matrix[j]= last;
1685  s->chroma_intra_matrix[j]= last;
1686  }
1687  }
1688 
1689  /* load custom non intra matrix */
1690  if(get_bits1(gb)){
1691  int last=0;
1692  for(i=0; i<64; i++){
1693  int j;
1694  v= get_bits(gb, 8);
1695  if(v==0) break;
1696 
1697  last= v;
1699  s->inter_matrix[j]= v;
1700  s->chroma_inter_matrix[j]= v;
1701  }
1702 
1703  /* replicate last value */
1704  for(; i<64; i++){
1705  int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1706  s->inter_matrix[j]= last;
1707  s->chroma_inter_matrix[j]= last;
1708  }
1709  }
1710 
1711  // FIXME a bunch of grayscale shape things
1712  }
1713 
1714  if(vo_ver_id != 1)
1715  s->quarter_sample= get_bits1(gb);
1716  else s->quarter_sample=0;
1717 
1718  if(!get_bits1(gb)){
1719  int pos= get_bits_count(gb);
1720  int estimation_method= get_bits(gb, 2);
1721  if(estimation_method<2){
1722  if(!get_bits1(gb)){
1723  s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
1724  s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
1725  s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
1726  s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
1727  s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
1728  s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
1729  }
1730  if(!get_bits1(gb)){
1731  s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
1732  s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
1733  s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
1734  s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
1735  }
1736  if(!check_marker(gb, "in complexity estimation part 1")){
1737  skip_bits_long(gb, pos - get_bits_count(gb));
1738  goto no_cplx_est;
1739  }
1740  if(!get_bits1(gb)){
1741  s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
1742  s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
1743  s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
1744  s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
1745  }
1746  if(!get_bits1(gb)){
1747  s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
1748  s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
1749  s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
1750  s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
1751  s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
1752  s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
1753  }
1754  if(!check_marker(gb, "in complexity estimation part 2")){
1755  skip_bits_long(gb, pos - get_bits_count(gb));
1756  goto no_cplx_est;
1757  }
1758  if(estimation_method==1){
1759  s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
1760  s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
1761  }
1762  }else
1763  av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
1764  }else{
1765 no_cplx_est:
1769  }
1770 
1771  s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
1772 
1773  s->data_partitioning= get_bits1(gb);
1774  if(s->data_partitioning){
1775  s->rvlc= get_bits1(gb);
1776  }
1777 
1778  if(vo_ver_id != 1) {
1779  s->new_pred= get_bits1(gb);
1780  if(s->new_pred){
1781  av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1782  skip_bits(gb, 2); /* requested upstream message type */
1783  skip_bits1(gb); /* newpred segment type */
1784  }
1785  s->reduced_res_vop= get_bits1(gb);
1786  if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
1787  }
1788  else{
1789  s->new_pred=0;
1790  s->reduced_res_vop= 0;
1791  }
1792 
1793  s->scalability= get_bits1(gb);
1794 
1795  if (s->scalability) {
1796  GetBitContext bak= *gb;
1797  int h_sampling_factor_n;
1798  int h_sampling_factor_m;
1799  int v_sampling_factor_n;
1800  int v_sampling_factor_m;
1801 
1802  s->hierachy_type= get_bits1(gb);
1803  skip_bits(gb, 4); /* ref_layer_id */
1804  skip_bits1(gb); /* ref_layer_sampling_dir */
1805  h_sampling_factor_n= get_bits(gb, 5);
1806  h_sampling_factor_m= get_bits(gb, 5);
1807  v_sampling_factor_n= get_bits(gb, 5);
1808  v_sampling_factor_m= get_bits(gb, 5);
1809  s->enhancement_type= get_bits1(gb);
1810 
1811  if( h_sampling_factor_n==0 || h_sampling_factor_m==0
1812  || v_sampling_factor_n==0 || v_sampling_factor_m==0){
1813  /* illegal scalability header (VERY broken encoder),
1814  * trying to workaround */
1815  s->scalability=0;
1816  *gb= bak;
1817  }else
1818  av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1819 
1820  // bin shape stuff FIXME
1821  }
1822  }
1823  return 0;
1824 }
1825 
1831  char buf[256];
1832  int i;
1833  int e;
1834  int ver = 0, build = 0, ver2 = 0, ver3 = 0;
1835  char last;
1836 
1837  for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
1838  if(show_bits(gb, 23) == 0) break;
1839  buf[i]= get_bits(gb, 8);
1840  }
1841  buf[i]=0;
1842 
1843  /* divx detection */
1844  e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
1845  if(e<2)
1846  e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
1847  if(e>=2){
1848  s->divx_version= ver;
1849  s->divx_build= build;
1850  s->divx_packed= e==3 && last=='p';
1851  if(s->divx_packed && !s->showed_packed_warning) {
1852  av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
1853  s->showed_packed_warning=1;
1854  }
1855  }
1856 
1857  /* libavcodec detection */
1858  e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
1859  if(e!=4)
1860  e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
1861  if(e!=4){
1862  e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
1863  if (e>1)
1864  build= (ver<<16) + (ver2<<8) + ver3;
1865  }
1866  if(e!=4){
1867  if(strcmp(buf, "ffmpeg")==0){
1868  s->lavc_build= 4600;
1869  }
1870  }
1871  if(e==4){
1872  s->lavc_build= build;
1873  }
1874 
1875  /* Xvid detection */
1876  e=sscanf(buf, "XviD%d", &build);
1877  if(e==1){
1878  s->xvid_build= build;
1879  }
1880 
1881  return 0;
1882 }
1883 
1885  int time_incr, time_increment;
1886 
1887  s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
1889  av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
1890  s->low_delay=0;
1891  }
1892 
1894  if(s->partitioned_frame)
1896  else
1898 
1899  time_incr=0;
1900  while (get_bits1(gb) != 0)
1901  time_incr++;
1902 
1903  check_marker(gb, "before time_increment");
1904 
1905  if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
1906  av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
1907 
1909  if ( s->pict_type == AV_PICTURE_TYPE_P
1911  if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
1912  }else
1913  if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
1914  }
1915 
1916  av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
1917  }
1918 
1919  if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
1920  else time_increment= get_bits(gb, s->time_increment_bits);
1921 
1922  if(s->pict_type!=AV_PICTURE_TYPE_B){
1923  s->last_time_base= s->time_base;
1924  s->time_base+= time_incr;
1925  s->time= s->time_base*s->avctx->time_base.den + time_increment;
1927  if(s->time < s->last_non_b_time){
1928  /* header is not mpeg-4-compatible, broken encoder,
1929  * trying to workaround */
1930  s->time_base++;
1931  s->time+= s->avctx->time_base.den;
1932  }
1933  }
1934  s->pp_time= s->time - s->last_non_b_time;
1935  s->last_non_b_time= s->time;
1936  }else{
1937  s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
1938  s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
1939  if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
1940  /* messed up order, maybe after seeking? skipping current b-frame */
1941  return FRAME_SKIPPED;
1942  }
1944 
1945  if(s->t_frame==0) s->t_frame= s->pb_time;
1946  if(s->t_frame==0) s->t_frame=1; // 1/0 protection
1948  - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1949  s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
1950  - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1951  if(!s->progressive_sequence){
1952  if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
1953  return FRAME_SKIPPED;
1954  }
1955  }
1956 
1957  if(s->avctx->time_base.num)
1958  s->current_picture_ptr->f.pts = (s->time + s->avctx->time_base.num / 2) / s->avctx->time_base.num;
1959  else
1961  if(s->avctx->debug&FF_DEBUG_PTS)
1962  av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
1963  s->current_picture_ptr->f.pts);
1964 
1965  check_marker(gb, "before vop_coded");
1966 
1967  /* vop coded */
1968  if (get_bits1(gb) != 1){
1970  av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
1971  return FRAME_SKIPPED;
1972  }
1973  if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == AV_PICTURE_TYPE_P
1975  /* rounding type for motion estimation */
1976  s->no_rounding = get_bits1(gb);
1977  } else {
1978  s->no_rounding = 0;
1979  }
1980 //FIXME reduced res stuff
1981 
1982  if (s->shape != RECT_SHAPE) {
1983  if (s->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
1984  skip_bits(gb, 13); /* width */
1985  skip_bits1(gb); /* marker */
1986  skip_bits(gb, 13); /* height */
1987  skip_bits1(gb); /* marker */
1988  skip_bits(gb, 13); /* hor_spat_ref */
1989  skip_bits1(gb); /* marker */
1990  skip_bits(gb, 13); /* ver_spat_ref */
1991  }
1992  skip_bits1(gb); /* change_CR_disable */
1993 
1994  if (get_bits1(gb) != 0) {
1995  skip_bits(gb, 8); /* constant_alpha_value */
1996  }
1997  }
1998 //FIXME complexity estimation stuff
1999 
2000  if (s->shape != BIN_ONLY_SHAPE) {
2002  if(s->pict_type != AV_PICTURE_TYPE_I)
2004  if(s->pict_type == AV_PICTURE_TYPE_B)
2006 
2008  if(!s->progressive_sequence){
2009  s->top_field_first= get_bits1(gb);
2010  s->alternate_scan= get_bits1(gb);
2011  }else
2012  s->alternate_scan= 0;
2013  }
2014 
2015  if(s->alternate_scan){
2020  } else{
2025  }
2026 
2029  if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
2030  if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2031  }
2032 
2033  if (s->shape != BIN_ONLY_SHAPE) {
2034  s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
2035  if(s->qscale==0){
2036  av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
2037  return -1; // makes no sense to continue, as there is nothing left from the image then
2038  }
2039 
2040  if (s->pict_type != AV_PICTURE_TYPE_I) {
2041  s->f_code = get_bits(gb, 3); /* fcode_for */
2042  if(s->f_code==0){
2043  av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
2044  return -1; // makes no sense to continue, as the MV decoding will break very quickly
2045  }
2046  }else
2047  s->f_code=1;
2048 
2049  if (s->pict_type == AV_PICTURE_TYPE_B) {
2050  s->b_code = get_bits(gb, 3);
2051  }else
2052  s->b_code=1;
2053 
2054  if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2055  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\n",
2056  s->qscale, s->f_code, s->b_code,
2057  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")),
2061  }
2062 
2063  if(!s->scalability){
2064  if (s->shape!=RECT_SHAPE && s->pict_type!=AV_PICTURE_TYPE_I) {
2065  skip_bits1(gb); // vop shape coding type
2066  }
2067  }else{
2068  if(s->enhancement_type){
2069  int load_backward_shape= get_bits1(gb);
2070  if(load_backward_shape){
2071  av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
2072  }
2073  }
2074  skip_bits(gb, 2); //ref_select_code
2075  }
2076  }
2077  /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
2078  // note we cannot detect divx5 without b-frames easily (although it's buggy too)
2079  if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
2080  av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2081  s->low_delay=1;
2082  }
2083 
2084  s->picture_number++; // better than pic number==0 always ;)
2085 
2086  s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
2088 
2090  s->h_edge_pos= s->width;
2091  s->v_edge_pos= s->height;
2092  }
2093  return 0;
2094 }
2095 
2103 {
2104  unsigned startcode, v;
2105 
2106  /* search next start code */
2107  align_get_bits(gb);
2108 
2109  if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
2110  skip_bits(gb, 24);
2111  if(get_bits(gb, 8) == 0xF0)
2112  goto end;
2113  }
2114 
2115  startcode = 0xff;
2116  for(;;) {
2117  if(get_bits_count(gb) >= gb->size_in_bits){
2118  if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){
2119  av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2120  return FRAME_SKIPPED; //divx bug
2121  }else
2122  return -1; //end of stream
2123  }
2124 
2125  /* use the bits after the test */
2126  v = get_bits(gb, 8);
2127  startcode = ((startcode << 8) | v) & 0xffffffff;
2128 
2129  if((startcode&0xFFFFFF00) != 0x100)
2130  continue; //no startcode
2131 
2132  if(s->avctx->debug&FF_DEBUG_STARTCODE){
2133  av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2134  if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2135  else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2136  else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2137  else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2138  else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2139  else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2140  else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2141  else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2142  else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2143  else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2144  else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2145  else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2146  else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2147  else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2148  else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2149  else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2150  else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2151  else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2152  else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2153  else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2154  else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2155  else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2156  else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2157  else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2158  else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2159  else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2160  else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
2161  av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2162  }
2163 
2164  if(startcode >= 0x120 && startcode <= 0x12F){
2165  if(decode_vol_header(s, gb) < 0)
2166  return -1;
2167  }
2168  else if(startcode == USER_DATA_STARTCODE){
2169  decode_user_data(s, gb);
2170  }
2171  else if(startcode == GOP_STARTCODE){
2172  mpeg4_decode_gop_header(s, gb);
2173  }
2174  else if(startcode == VOS_STARTCODE){
2176  }
2177  else if(startcode == VOP_STARTCODE){
2178  break;
2179  }
2180 
2181  align_get_bits(gb);
2182  startcode = 0xff;
2183  }
2184 end:
2185  if(s->flags& CODEC_FLAG_LOW_DELAY)
2186  s->low_delay=1;
2187  s->avctx->has_b_frames= !s->low_delay;
2188  return decode_vop_header(s, gb);
2189 }
2190 
2192 {
2193  MpegEncContext *s = avctx->priv_data;
2194  int ret;
2195  static int done = 0;
2196 
2197  s->divx_version=
2198  s->divx_build=
2199  s->xvid_build=
2200  s->lavc_build= -1;
2201 
2202  if((ret=ff_h263_decode_init(avctx)) < 0)
2203  return ret;
2204 
2205  if (!done) {
2206  done = 1;
2207 
2212  INIT_VLC_RL(rvlc_rl_inter, 1072);
2213  INIT_VLC_RL(rvlc_rl_intra, 1072);
2214  INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2215  &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2216  &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2217  INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2218  &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2219  &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2220  INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2221  &sprite_trajectory_tab[0][1], 4, 2,
2222  &sprite_trajectory_tab[0][0], 4, 2, 128);
2223  INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2224  &mb_type_b_tab[0][1], 2, 1,
2225  &mb_type_b_tab[0][0], 2, 1, 16);
2226  }
2227 
2228  s->h263_pred = 1;
2229  s->low_delay = 0; //default, might be overriden in the vol header during header parsing
2231  s->time_increment_bits = 4; /* default value for broken headers */
2233 
2234  return 0;
2235 }
2236 
2238  { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2239  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2240  { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2241  { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2242  { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2243  { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2244  { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2245  { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2246  { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2247  { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2248  { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2249  { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2250  { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2251  { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2252  { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2253  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2254 };
2255 
2257  .name = "mpeg4",
2258  .type = AVMEDIA_TYPE_VIDEO,
2259  .id = CODEC_ID_MPEG4,
2260  .priv_data_size = sizeof(MpegEncContext),
2261  .init = decode_init,
2265  .flush= ff_mpeg_flush,
2266  .max_lowres= 3,
2267  .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2268  .pix_fmts= ff_hwaccel_pixfmt_list_420,
2269  .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2271 };
2272 
2273 
2274 #if CONFIG_MPEG4_VDPAU_DECODER
2275 AVCodec ff_mpeg4_vdpau_decoder = {
2276  .name = "mpeg4_vdpau",
2277  .type = AVMEDIA_TYPE_VIDEO,
2278  .id = CODEC_ID_MPEG4,
2279  .priv_data_size = sizeof(MpegEncContext),
2280  .init = decode_init,
2284  .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2285  .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE},
2286 };
2287 #endif