wmv2dec.c
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1 /*
2  * Copyright (c) 2002 The Libav Project
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "avcodec.h"
22 #include "dsputil.h"
23 #include "mpegvideo.h"
24 #include "h263.h"
25 #include "mathops.h"
26 #include "msmpeg4.h"
27 #include "msmpeg4data.h"
28 #include "intrax8.h"
29 #include "wmv2.h"
30 
31 
32 static void parse_mb_skip(Wmv2Context * w){
33  int mb_x, mb_y;
34  MpegEncContext * const s= &w->s;
35  uint32_t * const mb_type = s->current_picture_ptr->f.mb_type;
36 
37  w->skip_type= get_bits(&s->gb, 2);
38  switch(w->skip_type){
39  case SKIP_TYPE_NONE:
40  for(mb_y=0; mb_y<s->mb_height; mb_y++){
41  for(mb_x=0; mb_x<s->mb_width; mb_x++){
42  mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_16x16 | MB_TYPE_L0;
43  }
44  }
45  break;
46  case SKIP_TYPE_MPEG:
47  for(mb_y=0; mb_y<s->mb_height; mb_y++){
48  for(mb_x=0; mb_x<s->mb_width; mb_x++){
49  mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
50  }
51  }
52  break;
53  case SKIP_TYPE_ROW:
54  for(mb_y=0; mb_y<s->mb_height; mb_y++){
55  if(get_bits1(&s->gb)){
56  for(mb_x=0; mb_x<s->mb_width; mb_x++){
57  mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
58  }
59  }else{
60  for(mb_x=0; mb_x<s->mb_width; mb_x++){
61  mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
62  }
63  }
64  }
65  break;
66  case SKIP_TYPE_COL:
67  for(mb_x=0; mb_x<s->mb_width; mb_x++){
68  if(get_bits1(&s->gb)){
69  for(mb_y=0; mb_y<s->mb_height; mb_y++){
70  mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
71  }
72  }else{
73  for(mb_y=0; mb_y<s->mb_height; mb_y++){
74  mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
75  }
76  }
77  }
78  break;
79  }
80 }
81 
83  MpegEncContext * const s= &w->s;
84  GetBitContext gb;
85  int fps;
86  int code;
87 
88  if(s->avctx->extradata_size<4) return -1;
89 
90  init_get_bits(&gb, s->avctx->extradata, 32);
91 
92  fps = get_bits(&gb, 5);
93  s->bit_rate = get_bits(&gb, 11)*1024;
94  w->mspel_bit = get_bits1(&gb);
95  s->loop_filter = get_bits1(&gb);
96  w->abt_flag = get_bits1(&gb);
97  w->j_type_bit = get_bits1(&gb);
98  w->top_left_mv_flag= get_bits1(&gb);
99  w->per_mb_rl_bit = get_bits1(&gb);
100  code = get_bits(&gb, 3);
101 
102  if(code==0) return -1;
103 
104  s->slice_height = s->mb_height / code;
105 
107  av_log(s->avctx, AV_LOG_DEBUG, "fps:%d, br:%d, qpbit:%d, abt_flag:%d, j_type_bit:%d, tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, slices:%d\n",
108  fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit, w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
109  code);
110  }
111  return 0;
112 }
113 
115 {
116  Wmv2Context * const w= (Wmv2Context*)s;
117  int code;
118 
119  if(s->picture_number==0)
121 
122  s->pict_type = get_bits1(&s->gb) + 1;
123  if(s->pict_type == AV_PICTURE_TYPE_I){
124  code = get_bits(&s->gb, 7);
125  av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
126  }
127  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
128  if(s->qscale <= 0)
129  return -1;
130 
131  return 0;
132 }
133 
135 {
136  Wmv2Context * const w= (Wmv2Context*)s;
137 
138  if (s->pict_type == AV_PICTURE_TYPE_I) {
139  if(w->j_type_bit) w->j_type= get_bits1(&s->gb);
140  else w->j_type= 0; //FIXME check
141 
142  if(!w->j_type){
143  if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
144  else s->per_mb_rl_table= 0;
145 
146  if(!s->per_mb_rl_table){
148  s->rl_table_index = decode012(&s->gb);
149  }
150 
151  s->dc_table_index = get_bits1(&s->gb);
152  }
153  s->inter_intra_pred= 0;
154  s->no_rounding = 1;
156  av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
157  s->qscale,
159  s->rl_table_index,
160  s->dc_table_index,
161  s->per_mb_rl_table,
162  w->j_type);
163  }
164  }else{
165  int cbp_index;
166  w->j_type=0;
167 
168  parse_mb_skip(w);
169  cbp_index= decode012(&s->gb);
170  if(s->qscale <= 10){
171  int map[3]= {0,2,1};
172  w->cbp_table_index= map[cbp_index];
173  }else if(s->qscale <= 20){
174  int map[3]= {1,0,2};
175  w->cbp_table_index= map[cbp_index];
176  }else{
177  int map[3]= {2,1,0};
178  w->cbp_table_index= map[cbp_index];
179  }
180 
181  if(w->mspel_bit) s->mspel= get_bits1(&s->gb);
182  else s->mspel= 0; //FIXME check
183 
184  if(w->abt_flag){
185  w->per_mb_abt= get_bits1(&s->gb)^1;
186  if(!w->per_mb_abt){
187  w->abt_type= decode012(&s->gb);
188  }
189  }
190 
191  if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
192  else s->per_mb_rl_table= 0;
193 
194  if(!s->per_mb_rl_table){
195  s->rl_table_index = decode012(&s->gb);
197  }
198 
199  s->dc_table_index = get_bits1(&s->gb);
200  s->mv_table_index = get_bits1(&s->gb);
201 
202  s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
203  s->no_rounding ^= 1;
204 
206  av_log(s->avctx, AV_LOG_DEBUG, "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
207  s->rl_table_index,
209  s->dc_table_index,
210  s->mv_table_index,
211  s->per_mb_rl_table,
212  s->qscale,
213  s->mspel,
214  w->per_mb_abt,
215  w->abt_type,
216  w->cbp_table_index,
217  s->inter_intra_pred);
218  }
219  }
220  s->esc3_level_length= 0;
221  s->esc3_run_length= 0;
222 
223 s->picture_number++; //FIXME ?
224 
225 
226  if(w->j_type){
227  ff_intrax8_decode_picture(&w->x8, 2*s->qscale, (s->qscale-1)|1 );
228  return 1;
229  }
230 
231  return 0;
232 }
233 
234 static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr){
235  MpegEncContext * const s= &w->s;
236  int ret;
237 
238  ret= ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
239 
240  if(ret<0) return -1;
241 
242  if((((*mx_ptr)|(*my_ptr)) & 1) && s->mspel)
243  w->hshift= get_bits1(&s->gb);
244  else
245  w->hshift= 0;
246 
247 //printf("%d %d ", *mx_ptr, *my_ptr);
248 
249  return 0;
250 }
251 
252 static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py){
253  MpegEncContext * const s= &w->s;
254  int xy, wrap, diff, type;
255  int16_t *A, *B, *C, *mot_val;
256 
257  wrap = s->b8_stride;
258  xy = s->block_index[0];
259 
260  mot_val = s->current_picture.f.motion_val[0][xy];
261 
262  A = s->current_picture.f.motion_val[0][xy - 1];
263  B = s->current_picture.f.motion_val[0][xy - wrap];
264  C = s->current_picture.f.motion_val[0][xy + 2 - wrap];
265 
266  if(s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
267  diff= FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
268  else
269  diff=0;
270 
271  if(diff >= 8)
272  type= get_bits1(&s->gb);
273  else
274  type= 2;
275 
276  if(type == 0){
277  *px= A[0];
278  *py= A[1];
279  }else if(type == 1){
280  *px= B[0];
281  *py= B[1];
282  }else{
283  /* special case for first (slice) line */
284  if (s->first_slice_line) {
285  *px = A[0];
286  *py = A[1];
287  } else {
288  *px = mid_pred(A[0], B[0], C[0]);
289  *py = mid_pred(A[1], B[1], C[1]);
290  }
291  }
292 
293  return mot_val;
294 }
295 
296 static inline int wmv2_decode_inter_block(Wmv2Context *w, DCTELEM *block, int n, int cbp){
297  MpegEncContext * const s= &w->s;
298  static const int sub_cbp_table[3]= {2,3,1};
299  int sub_cbp;
300 
301  if(!cbp){
302  s->block_last_index[n] = -1;
303 
304  return 0;
305  }
306 
307  if(w->per_block_abt)
308  w->abt_type= decode012(&s->gb);
309  w->abt_type_table[n]= w->abt_type;
310 
311  if(w->abt_type){
312 // const uint8_t *scantable= w->abt_scantable[w->abt_type-1].permutated;
313  const uint8_t *scantable= w->abt_scantable[w->abt_type-1].scantable;
314 // const uint8_t *scantable= w->abt_type-1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
315 
316  sub_cbp= sub_cbp_table[ decode012(&s->gb) ];
317 // printf("S%d", sub_cbp);
318 
319  if(sub_cbp&1){
320  if (ff_msmpeg4_decode_block(s, block, n, 1, scantable) < 0)
321  return -1;
322  }
323 
324  if(sub_cbp&2){
325  if (ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0)
326  return -1;
327  }
328  s->block_last_index[n] = 63;
329 
330  return 0;
331  }else{
332  return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated);
333  }
334 }
335 
336 
338 {
339  Wmv2Context * const w= (Wmv2Context*)s;
340  int cbp, code, i;
341  uint8_t *coded_val;
342 
343  if(w->j_type) return 0;
344 
345  if (s->pict_type == AV_PICTURE_TYPE_P) {
346  if (IS_SKIP(s->current_picture.f.mb_type[s->mb_y * s->mb_stride + s->mb_x])) {
347  /* skip mb */
348  s->mb_intra = 0;
349  for(i=0;i<6;i++)
350  s->block_last_index[i] = -1;
351  s->mv_dir = MV_DIR_FORWARD;
352  s->mv_type = MV_TYPE_16X16;
353  s->mv[0][0][0] = 0;
354  s->mv[0][0][1] = 0;
355  s->mb_skipped = 1;
356  w->hshift=0;
357  return 0;
358  }
359 
361  if (code < 0)
362  return -1;
363  s->mb_intra = (~code & 0x40) >> 6;
364 
365  cbp = code & 0x3f;
366  } else {
367  s->mb_intra = 1;
369  if (code < 0){
370  av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
371  return -1;
372  }
373  /* predict coded block pattern */
374  cbp = 0;
375  for(i=0;i<6;i++) {
376  int val = ((code >> (5 - i)) & 1);
377  if (i < 4) {
378  int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
379  val = val ^ pred;
380  *coded_val = val;
381  }
382  cbp |= val << (5 - i);
383  }
384  }
385 
386  if (!s->mb_intra) {
387  int mx, my;
388 //printf("P at %d %d\n", s->mb_x, s->mb_y);
389  wmv2_pred_motion(w, &mx, &my);
390 
391  if(cbp){
392  s->dsp.clear_blocks(s->block[0]);
393  if(s->per_mb_rl_table){
394  s->rl_table_index = decode012(&s->gb);
396  }
397 
398  if(w->abt_flag && w->per_mb_abt){
399  w->per_block_abt= get_bits1(&s->gb);
400  if(!w->per_block_abt)
401  w->abt_type= decode012(&s->gb);
402  }else
403  w->per_block_abt=0;
404  }
405 
406  if (wmv2_decode_motion(w, &mx, &my) < 0)
407  return -1;
408 
409  s->mv_dir = MV_DIR_FORWARD;
410  s->mv_type = MV_TYPE_16X16;
411  s->mv[0][0][0] = mx;
412  s->mv[0][0][1] = my;
413 
414  for (i = 0; i < 6; i++) {
415  if (wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1) < 0)
416  {
417  av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
418  return -1;
419  }
420  }
421  } else {
422 //if(s->pict_type==AV_PICTURE_TYPE_P)
423 // printf("%d%d ", s->inter_intra_pred, cbp);
424 //printf("I at %d %d %d %06X\n", s->mb_x, s->mb_y, ((cbp&3)? 1 : 0) +((cbp&0x3C)? 2 : 0), show_bits(&s->gb, 24));
425  s->ac_pred = get_bits1(&s->gb);
426  if(s->inter_intra_pred){
428 // printf("%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
429  }
430  if(s->per_mb_rl_table && cbp){
431  s->rl_table_index = decode012(&s->gb);
433  }
434 
435  s->dsp.clear_blocks(s->block[0]);
436  for (i = 0; i < 6; i++) {
437  if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
438  {
439  av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
440  return -1;
441  }
442  }
443  }
444 
445  return 0;
446 }
447 
449  Wmv2Context * const w= avctx->priv_data;
450 
451  if(avctx->idct_algo==FF_IDCT_AUTO){
452  avctx->idct_algo=FF_IDCT_WMV2;
453  }
454 
455  if(ff_msmpeg4_decode_init(avctx) < 0)
456  return -1;
457 
459 
460  ff_intrax8_common_init(&w->x8,&w->s);
461 
462  return 0;
463 }
464 
466 {
467  Wmv2Context *w = avctx->priv_data;
468 
470  return ff_h263_decode_end(avctx);
471 }
472 
474  .name = "wmv2",
475  .type = AVMEDIA_TYPE_VIDEO,
476  .id = CODEC_ID_WMV2,
477  .priv_data_size = sizeof(Wmv2Context),
481  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
482  .max_lowres = 3,
483  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
484  .pix_fmts= ff_pixfmt_list_420,
485 };