f4f0c2949054439ed164ac053af2f3bee7d9b9b7
[libav.git] / libavcodec / h263dec.c
1 /*
2 * H.263 decoder
3 * Copyright (c) 2001 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 /**
21 * @file h263dec.c
22 * H.263 decoder.
23 */
24
25 #include "avcodec.h"
26 #include "dsputil.h"
27 #include "mpegvideo.h"
28
29 //#define DEBUG
30 //#define PRINT_FRAME_TIME
31 #ifdef PRINT_FRAME_TIME
32 static inline long long rdtsc()
33 {
34 long long l;
35 asm volatile( "rdtsc\n\t"
36 : "=A" (l)
37 );
38 // printf("%d\n", int(l/1000));
39 return l;
40 }
41 #endif
42
43 int ff_h263_decode_init(AVCodecContext *avctx)
44 {
45 MpegEncContext *s = avctx->priv_data;
46
47 s->avctx = avctx;
48 s->out_format = FMT_H263;
49
50 s->width = avctx->width;
51 s->height = avctx->height;
52 s->workaround_bugs= avctx->workaround_bugs;
53
54 // set defaults
55 s->quant_precision=5;
56 s->progressive_sequence=1;
57 s->decode_mb= ff_h263_decode_mb;
58 s->low_delay= 1;
59 avctx->pix_fmt= PIX_FMT_YUV420P;
60 s->unrestricted_mv= 1;
61
62 /* select sub codec */
63 switch(avctx->codec->id) {
64 case CODEC_ID_H263:
65 s->gob_number = 0;
66 break;
67 case CODEC_ID_MPEG4:
68 s->time_increment_bits = 4; /* default value for broken headers */
69 s->h263_pred = 1;
70 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
71 break;
72 case CODEC_ID_MSMPEG4V1:
73 s->h263_msmpeg4 = 1;
74 s->h263_pred = 1;
75 s->msmpeg4_version=1;
76 break;
77 case CODEC_ID_MSMPEG4V2:
78 s->h263_msmpeg4 = 1;
79 s->h263_pred = 1;
80 s->msmpeg4_version=2;
81 break;
82 case CODEC_ID_MSMPEG4V3:
83 s->h263_msmpeg4 = 1;
84 s->h263_pred = 1;
85 s->msmpeg4_version=3;
86 break;
87 case CODEC_ID_WMV1:
88 s->h263_msmpeg4 = 1;
89 s->h263_pred = 1;
90 s->msmpeg4_version=4;
91 break;
92 case CODEC_ID_WMV2:
93 s->h263_msmpeg4 = 1;
94 s->h263_pred = 1;
95 s->msmpeg4_version=5;
96 break;
97 case CODEC_ID_H263I:
98 s->h263_intel = 1;
99 break;
100 case CODEC_ID_FLV1:
101 s->h263_flv = 1;
102 break;
103 default:
104 return -1;
105 }
106 s->codec_id= avctx->codec->id;
107
108 /* for h263, we allocate the images after having read the header */
109 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
110 if (MPV_common_init(s) < 0)
111 return -1;
112
113 if (s->h263_msmpeg4)
114 ff_msmpeg4_decode_init(s);
115 else
116 h263_decode_init_vlc(s);
117
118 return 0;
119 }
120
121 int ff_h263_decode_end(AVCodecContext *avctx)
122 {
123 MpegEncContext *s = avctx->priv_data;
124
125 MPV_common_end(s);
126 return 0;
127 }
128
129 /**
130 * retunrs the number of bytes consumed for building the current frame
131 */
132 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
133 int pos= (get_bits_count(&s->gb)+7)>>3;
134
135 if(s->divx_packed){
136 //we would have to scan through the whole buf to handle the weird reordering ...
137 return buf_size;
138 }else if(s->flags&CODEC_FLAG_TRUNCATED){
139 pos -= s->parse_context.last_index;
140 if(pos<0) pos=0; // padding is not really read so this might be -1
141 return pos;
142 }else{
143 if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
144 if(pos+10>buf_size) pos=buf_size; // oops ;)
145
146 return pos;
147 }
148 }
149
150 static int decode_slice(MpegEncContext *s){
151 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
152 s->last_resync_gb= s->gb;
153 s->first_slice_line= 1;
154
155 s->resync_mb_x= s->mb_x;
156 s->resync_mb_y= s->mb_y;
157
158 s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
159 s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
160
161 if(s->partitioned_frame){
162 const int qscale= s->qscale;
163
164 if(s->codec_id==CODEC_ID_MPEG4){
165 if(ff_mpeg4_decode_partitions(s) < 0)
166 return -1;
167 }
168
169 /* restore variables which were modified */
170 s->first_slice_line=1;
171 s->mb_x= s->resync_mb_x;
172 s->mb_y= s->resync_mb_y;
173 s->qscale= qscale;
174 s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
175 s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
176 }
177
178 for(; s->mb_y < s->mb_height; s->mb_y++) {
179 /* per-row end of slice checks */
180 if(s->msmpeg4_version){
181 if(s->resync_mb_y + s->slice_height == s->mb_y){
182 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
183
184 return 0;
185 }
186 }
187
188 if(s->msmpeg4_version==1){
189 s->last_dc[0]=
190 s->last_dc[1]=
191 s->last_dc[2]= 128;
192 }
193
194 ff_init_block_index(s);
195 for(; s->mb_x < s->mb_width; s->mb_x++) {
196 int ret;
197
198 ff_update_block_index(s);
199
200 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
201 s->first_slice_line=0;
202 }
203
204 /* DCT & quantize */
205 s->dsp.clear_blocks(s->block[0]);
206
207 s->mv_dir = MV_DIR_FORWARD;
208 s->mv_type = MV_TYPE_16X16;
209 // s->mb_skiped = 0;
210 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
211 ret= s->decode_mb(s, s->block);
212
213 if (s->pict_type!=B_TYPE)
214 ff_h263_update_motion_val(s);
215
216 if(ret<0){
217 const int xy= s->mb_x + s->mb_y*s->mb_stride;
218 if(ret==SLICE_END){
219 MPV_decode_mb(s, s->block);
220
221 //printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24));
222 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
223
224 s->padding_bug_score--;
225
226 if(++s->mb_x >= s->mb_width){
227 s->mb_x=0;
228 ff_draw_horiz_band(s, s->mb_y*16, 16);
229 s->mb_y++;
230 }
231 return 0;
232 }else if(ret==SLICE_NOEND){
233 fprintf(stderr,"Slice mismatch at MB: %d\n", xy);
234 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
235 return -1;
236 }
237 fprintf(stderr,"Error at MB: %d\n", xy);
238 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
239
240 return -1;
241 }
242
243 MPV_decode_mb(s, s->block);
244 }
245
246 ff_draw_horiz_band(s, s->mb_y*16, 16);
247
248 s->mb_x= 0;
249 }
250
251 assert(s->mb_x==0 && s->mb_y==s->mb_height);
252
253 /* try to detect the padding bug */
254 if( s->codec_id==CODEC_ID_MPEG4
255 && (s->workaround_bugs&FF_BUG_AUTODETECT)
256 && s->gb.size_in_bits - get_bits_count(&s->gb) >=0
257 && s->gb.size_in_bits - get_bits_count(&s->gb) < 48
258 // && !s->resync_marker
259 && !s->data_partitioning){
260
261 const int bits_count= get_bits_count(&s->gb);
262 const int bits_left = s->gb.size_in_bits - bits_count;
263
264 if(bits_left==0){
265 s->padding_bug_score+=16;
266 }else if(bits_left>8){
267 s->padding_bug_score++;
268 } else if(bits_left != 1){
269 int v= show_bits(&s->gb, 8);
270 v|= 0x7F >> (7-(bits_count&7));
271
272 if(v==0x7F)
273 s->padding_bug_score--;
274 else
275 s->padding_bug_score++;
276 }
277 }
278
279 // handle formats which dont have unique end markers
280 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
281 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
282 int max_extra=7;
283
284 /* no markers in M$ crap */
285 if(s->msmpeg4_version && s->pict_type==I_TYPE)
286 max_extra+= 17;
287
288 /* buggy padding but the frame should still end approximately at the bitstream end */
289 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
290 max_extra+= 48;
291 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
292 max_extra+= 256*256*256*64;
293
294 if(left>max_extra){
295 fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
296 }
297 else if(left<0){
298 fprintf(stderr, "overreading %d bits\n", -left);
299 }else
300 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
301
302 return 0;
303 }
304
305 fprintf(stderr, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
306 s->gb.size_in_bits - get_bits_count(&s->gb),
307 show_bits(&s->gb, 24), s->padding_bug_score);
308
309 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
310
311 return -1;
312 }
313
314 /**
315 * finds the end of the current frame in the bitstream.
316 * @return the position of the first byte of the next frame, or -1
317 */
318 static int mpeg4_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
319 ParseContext *pc= &s->parse_context;
320 int vop_found, i;
321 uint32_t state;
322
323 vop_found= pc->frame_start_found;
324 state= pc->state;
325
326 i=0;
327 if(!vop_found){
328 for(i=0; i<buf_size; i++){
329 state= (state<<8) | buf[i];
330 if(state == 0x1B6){
331 i++;
332 vop_found=1;
333 break;
334 }
335 }
336 }
337
338 if(vop_found){
339 for(; i<buf_size; i++){
340 state= (state<<8) | buf[i];
341 if((state&0xFFFFFF00) == 0x100){
342 pc->frame_start_found=0;
343 pc->state=-1;
344 return i-3;
345 }
346 }
347 }
348 pc->frame_start_found= vop_found;
349 pc->state= state;
350 return END_NOT_FOUND;
351 }
352
353 static int h263_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
354 ParseContext *pc= &s->parse_context;
355 int vop_found, i;
356 uint32_t state;
357
358 vop_found= pc->frame_start_found;
359 state= pc->state;
360
361 i=0;
362 if(!vop_found){
363 for(i=0; i<buf_size; i++){
364 state= (state<<8) | buf[i];
365 if(state>>(32-22) == 0x20){
366 i++;
367 vop_found=1;
368 break;
369 }
370 }
371 }
372
373 if(vop_found){
374 for(; i<buf_size; i++){
375 state= (state<<8) | buf[i];
376 if(state>>(32-22) == 0x20){
377 pc->frame_start_found=0;
378 pc->state=-1;
379 return i-3;
380 }
381 }
382 }
383 pc->frame_start_found= vop_found;
384 pc->state= state;
385
386 return END_NOT_FOUND;
387 }
388
389 int ff_h263_decode_frame(AVCodecContext *avctx,
390 void *data, int *data_size,
391 uint8_t *buf, int buf_size)
392 {
393 MpegEncContext *s = avctx->priv_data;
394 int ret;
395 AVFrame *pict = data;
396 float new_aspect;
397
398 #ifdef PRINT_FRAME_TIME
399 uint64_t time= rdtsc();
400 #endif
401 #ifdef DEBUG
402 printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
403 printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
404 #endif
405 s->flags= avctx->flags;
406
407 *data_size = 0;
408
409 /* no supplementary picture */
410 if (buf_size == 0) {
411 /* special case for last picture */
412 if (s->low_delay==0 && s->next_picture_ptr) {
413 *pict= *(AVFrame*)s->next_picture_ptr;
414 s->next_picture_ptr= NULL;
415
416 *data_size = sizeof(AVFrame);
417 }
418
419 return 0;
420 }
421
422 if(s->flags&CODEC_FLAG_TRUNCATED){
423 int next;
424
425 if(s->codec_id==CODEC_ID_MPEG4){
426 next= mpeg4_find_frame_end(s, buf, buf_size);
427 }else if(s->codec_id==CODEC_ID_H263){
428 next= h263_find_frame_end(s, buf, buf_size);
429 }else{
430 fprintf(stderr, "this codec doesnt support truncated bitstreams\n");
431 return -1;
432 }
433
434 if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
435 return buf_size;
436 }
437
438 retry:
439
440 if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
441 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
442 }else
443 init_get_bits(&s->gb, buf, buf_size*8);
444 s->bitstream_buffer_size=0;
445
446 if (!s->context_initialized) {
447 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
448 return -1;
449 }
450
451 /* let's go :-) */
452 if (s->msmpeg4_version==5) {
453 ret= ff_wmv2_decode_picture_header(s);
454 } else if (s->msmpeg4_version) {
455 ret = msmpeg4_decode_picture_header(s);
456 } else if (s->h263_pred) {
457 if(s->avctx->extradata_size && s->picture_number==0){
458 GetBitContext gb;
459
460 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
461 ret = ff_mpeg4_decode_picture_header(s, &gb);
462 }
463 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
464
465 if(s->flags& CODEC_FLAG_LOW_DELAY)
466 s->low_delay=1;
467 } else if (s->h263_intel) {
468 ret = intel_h263_decode_picture_header(s);
469 } else if (s->h263_flv) {
470 ret = flv_h263_decode_picture_header(s);
471 } else {
472 ret = h263_decode_picture_header(s);
473 }
474
475 if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
476
477 /* skip if the header was thrashed */
478 if (ret < 0){
479 fprintf(stderr, "header damaged\n");
480 return -1;
481 }
482
483 avctx->has_b_frames= !s->low_delay;
484
485 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
486 if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
487 s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
488 s->xvid_build= -1;
489 #if 0
490 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
491 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
492 s->xvid_build= -1;
493 #endif
494 }
495
496 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
497 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
498 s->divx_version= 400; //divx 4
499 }
500
501 if(s->workaround_bugs&FF_BUG_AUTODETECT){
502 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
503
504 if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
505 s->workaround_bugs |= FF_BUG_NO_PADDING;
506
507 if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
508 s->workaround_bugs|= FF_BUG_XVID_ILACE;
509
510 if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
511 s->workaround_bugs|= FF_BUG_UMP4;
512 }
513
514 if(s->divx_version>=500){
515 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
516 }
517
518 if(s->divx_version>502){
519 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
520 }
521
522 if(s->xvid_build && s->xvid_build<=3)
523 s->padding_bug_score= 256*256*256*64;
524
525 if(s->xvid_build && s->xvid_build<=1)
526 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
527
528 if(s->xvid_build && s->xvid_build<=12)
529 s->workaround_bugs|= FF_BUG_EDGE;
530
531 #define SET_QPEL_FUNC(postfix1, postfix2) \
532 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
533 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
534 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
535
536 if(s->lavc_build && s->lavc_build<4653)
537 s->workaround_bugs|= FF_BUG_STD_QPEL;
538
539 if(s->lavc_build && s->lavc_build<4655)
540 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
541
542 if(s->lavc_build && s->lavc_build<4670){
543 s->workaround_bugs|= FF_BUG_EDGE;
544 }
545
546 if(s->divx_version)
547 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
548 //printf("padding_bug_score: %d\n", s->padding_bug_score);
549 if(s->divx_version==501 && s->divx_build==20020416)
550 s->padding_bug_score= 256*256*256*64;
551
552 if(s->divx_version && s->divx_version<500){
553 s->workaround_bugs|= FF_BUG_EDGE;
554 }
555
556 #if 0
557 if(s->divx_version==500)
558 s->padding_bug_score= 256*256*256*64;
559
560 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
561 * lets hope this at least works
562 */
563 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
564 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
565 s->workaround_bugs|= FF_BUG_NO_PADDING;
566
567 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
568 s->workaround_bugs|= FF_BUG_NO_PADDING;
569 #endif
570 }
571
572 if(s->workaround_bugs& FF_BUG_STD_QPEL){
573 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
574 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
575 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
576 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
577 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
578 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
579
580 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
581 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
582 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
583 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
584 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
585 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
586 }
587
588 if(avctx->debug & FF_DEBUG_BUGS)
589 printf("bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
590 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
591 s->divx_packed ? "p" : "");
592
593 #if 0 // dump bits per frame / qp / complexity
594 {
595 static FILE *f=NULL;
596 if(!f) f=fopen("rate_qp_cplx.txt", "w");
597 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
598 }
599 #endif
600
601 /* After H263 & mpeg4 header decode we have the height, width,*/
602 /* and other parameters. So then we could init the picture */
603 /* FIXME: By the way H263 decoder is evolving it should have */
604 /* an H263EncContext */
605 if(s->aspected_height)
606 new_aspect= s->aspected_width*s->width / (float)(s->height*s->aspected_height);
607 else
608 new_aspect=0;
609
610 if ( s->width != avctx->width || s->height != avctx->height
611 || ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
612 /* H.263 could change picture size any time */
613 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
614 s->parse_context.buffer=0;
615 MPV_common_end(s);
616 s->parse_context= pc;
617 }
618 if (!s->context_initialized) {
619 avctx->width = s->width;
620 avctx->height = s->height;
621 avctx->aspect_ratio= new_aspect;
622
623 goto retry;
624 }
625
626 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
627 s->gob_index = ff_h263_get_gob_height(s);
628
629 // for hurry_up==5
630 s->current_picture.pict_type= s->pict_type;
631 s->current_picture.key_frame= s->pict_type == I_TYPE;
632
633 /* skip b frames if we dont have reference frames */
634 if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
635 /* skip b frames if we are in a hurry */
636 if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
637 /* skip everything if we are in a hurry>=5 */
638 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
639
640 if(s->next_p_frame_damaged){
641 if(s->pict_type==B_TYPE)
642 return get_consumed_bytes(s, buf_size);
643 else
644 s->next_p_frame_damaged=0;
645 }
646
647 if(MPV_frame_start(s, avctx) < 0)
648 return -1;
649
650 #ifdef DEBUG
651 printf("qscale=%d\n", s->qscale);
652 #endif
653
654 ff_er_frame_start(s);
655
656 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
657 //which isnt available before MPV_frame_start()
658 if (s->msmpeg4_version==5){
659 if(ff_wmv2_decode_secondary_picture_header(s) < 0)
660 return -1;
661 }
662
663 /* decode each macroblock */
664 s->mb_x=0;
665 s->mb_y=0;
666
667 decode_slice(s);
668 while(s->mb_y<s->mb_height){
669 if(s->msmpeg4_version){
670 if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
671 break;
672 }else{
673 if(ff_h263_resync(s)<0)
674 break;
675 }
676
677 if(s->msmpeg4_version<4 && s->h263_pred)
678 ff_mpeg4_clean_buffers(s);
679
680 decode_slice(s);
681 }
682
683 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
684 if(msmpeg4_decode_ext_header(s, buf_size) < 0){
685 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
686 }
687
688 /* divx 5.01+ bistream reorder stuff */
689 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
690 int current_pos= get_bits_count(&s->gb)>>3;
691
692 if( buf_size - current_pos > 5
693 && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
694 int i;
695 int startcode_found=0;
696 for(i=current_pos; i<buf_size-3; i++){
697 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
698 startcode_found=1;
699 break;
700 }
701 }
702 if(startcode_found){
703 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
704 s->bitstream_buffer_size= buf_size - current_pos;
705 }
706 }
707 }
708
709 ff_er_frame_end(s);
710
711 MPV_frame_end(s);
712
713 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
714 assert(s->current_picture.pict_type == s->pict_type);
715 if(s->pict_type==B_TYPE || s->low_delay){
716 *pict= *(AVFrame*)&s->current_picture;
717 ff_print_debug_info(s, s->current_picture_ptr);
718 } else {
719 *pict= *(AVFrame*)&s->last_picture;
720 ff_print_debug_info(s, s->last_picture_ptr);
721 }
722
723 /* Return the Picture timestamp as the frame number */
724 /* we substract 1 because it is added on utils.c */
725 avctx->frame_number = s->picture_number - 1;
726
727 /* dont output the last pic after seeking */
728 if(s->last_picture_ptr || s->low_delay)
729 *data_size = sizeof(AVFrame);
730 #ifdef PRINT_FRAME_TIME
731 printf("%Ld\n", rdtsc()-time);
732 #endif
733
734 return get_consumed_bytes(s, buf_size);
735 }
736
737 static const AVOption mpeg4_decoptions[] =
738 {
739 AVOPTION_SUB(avoptions_workaround_bug),
740 AVOPTION_END()
741 };
742
743 AVCodec mpeg4_decoder = {
744 "mpeg4",
745 CODEC_TYPE_VIDEO,
746 CODEC_ID_MPEG4,
747 sizeof(MpegEncContext),
748 ff_h263_decode_init,
749 NULL,
750 ff_h263_decode_end,
751 ff_h263_decode_frame,
752 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
753 .options = mpeg4_decoptions,
754 .flush= ff_mpeg_flush,
755 };
756
757 AVCodec h263_decoder = {
758 "h263",
759 CODEC_TYPE_VIDEO,
760 CODEC_ID_H263,
761 sizeof(MpegEncContext),
762 ff_h263_decode_init,
763 NULL,
764 ff_h263_decode_end,
765 ff_h263_decode_frame,
766 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
767 .flush= ff_mpeg_flush,
768 };
769
770 AVCodec msmpeg4v1_decoder = {
771 "msmpeg4v1",
772 CODEC_TYPE_VIDEO,
773 CODEC_ID_MSMPEG4V1,
774 sizeof(MpegEncContext),
775 ff_h263_decode_init,
776 NULL,
777 ff_h263_decode_end,
778 ff_h263_decode_frame,
779 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
780 mpeg4_decoptions,
781 };
782
783 AVCodec msmpeg4v2_decoder = {
784 "msmpeg4v2",
785 CODEC_TYPE_VIDEO,
786 CODEC_ID_MSMPEG4V2,
787 sizeof(MpegEncContext),
788 ff_h263_decode_init,
789 NULL,
790 ff_h263_decode_end,
791 ff_h263_decode_frame,
792 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
793 mpeg4_decoptions,
794 };
795
796 AVCodec msmpeg4v3_decoder = {
797 "msmpeg4",
798 CODEC_TYPE_VIDEO,
799 CODEC_ID_MSMPEG4V3,
800 sizeof(MpegEncContext),
801 ff_h263_decode_init,
802 NULL,
803 ff_h263_decode_end,
804 ff_h263_decode_frame,
805 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
806 .options = mpeg4_decoptions,
807 };
808
809 AVCodec wmv1_decoder = {
810 "wmv1",
811 CODEC_TYPE_VIDEO,
812 CODEC_ID_WMV1,
813 sizeof(MpegEncContext),
814 ff_h263_decode_init,
815 NULL,
816 ff_h263_decode_end,
817 ff_h263_decode_frame,
818 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
819 mpeg4_decoptions,
820 };
821
822 AVCodec h263i_decoder = {
823 "h263i",
824 CODEC_TYPE_VIDEO,
825 CODEC_ID_H263I,
826 sizeof(MpegEncContext),
827 ff_h263_decode_init,
828 NULL,
829 ff_h263_decode_end,
830 ff_h263_decode_frame,
831 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
832 mpeg4_decoptions,
833 };
834
835 AVCodec flv_decoder = {
836 "flv",
837 CODEC_TYPE_VIDEO,
838 CODEC_ID_FLV1,
839 sizeof(MpegEncContext),
840 ff_h263_decode_init,
841 NULL,
842 ff_h263_decode_end,
843 ff_h263_decode_frame,
844 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
845 };