AVRational
[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
397 #ifdef PRINT_FRAME_TIME
398 uint64_t time= rdtsc();
399 #endif
400 #ifdef DEBUG
401 printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
402 printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
403 #endif
404 s->flags= avctx->flags;
405
406 *data_size = 0;
407
408 /* no supplementary picture */
409 if (buf_size == 0) {
410 /* special case for last picture */
411 if (s->low_delay==0 && s->next_picture_ptr) {
412 *pict= *(AVFrame*)s->next_picture_ptr;
413 s->next_picture_ptr= NULL;
414
415 *data_size = sizeof(AVFrame);
416 }
417
418 return 0;
419 }
420
421 if(s->flags&CODEC_FLAG_TRUNCATED){
422 int next;
423
424 if(s->codec_id==CODEC_ID_MPEG4){
425 next= mpeg4_find_frame_end(s, buf, buf_size);
426 }else if(s->codec_id==CODEC_ID_H263){
427 next= h263_find_frame_end(s, buf, buf_size);
428 }else{
429 fprintf(stderr, "this codec doesnt support truncated bitstreams\n");
430 return -1;
431 }
432
433 if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
434 return buf_size;
435 }
436
437 retry:
438
439 if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
440 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
441 }else
442 init_get_bits(&s->gb, buf, buf_size*8);
443 s->bitstream_buffer_size=0;
444
445 if (!s->context_initialized) {
446 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
447 return -1;
448 }
449
450 /* let's go :-) */
451 if (s->msmpeg4_version==5) {
452 ret= ff_wmv2_decode_picture_header(s);
453 } else if (s->msmpeg4_version) {
454 ret = msmpeg4_decode_picture_header(s);
455 } else if (s->h263_pred) {
456 if(s->avctx->extradata_size && s->picture_number==0){
457 GetBitContext gb;
458
459 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
460 ret = ff_mpeg4_decode_picture_header(s, &gb);
461 }
462 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
463
464 if(s->flags& CODEC_FLAG_LOW_DELAY)
465 s->low_delay=1;
466 } else if (s->h263_intel) {
467 ret = intel_h263_decode_picture_header(s);
468 } else if (s->h263_flv) {
469 ret = flv_h263_decode_picture_header(s);
470 } else {
471 ret = h263_decode_picture_header(s);
472 }
473
474 if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
475
476 /* skip if the header was thrashed */
477 if (ret < 0){
478 fprintf(stderr, "header damaged\n");
479 return -1;
480 }
481
482 avctx->has_b_frames= !s->low_delay;
483
484 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
485 if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
486 s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
487 s->xvid_build= -1;
488 #if 0
489 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
490 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
491 s->xvid_build= -1;
492 #endif
493 }
494
495 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
496 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
497 s->divx_version= 400; //divx 4
498 }
499
500 if(s->workaround_bugs&FF_BUG_AUTODETECT){
501 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
502
503 if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
504 s->workaround_bugs |= FF_BUG_NO_PADDING;
505
506 if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
507 s->workaround_bugs|= FF_BUG_XVID_ILACE;
508
509 if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
510 s->workaround_bugs|= FF_BUG_UMP4;
511 }
512
513 if(s->divx_version>=500){
514 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
515 }
516
517 if(s->divx_version>502){
518 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
519 }
520
521 if(s->xvid_build && s->xvid_build<=3)
522 s->padding_bug_score= 256*256*256*64;
523
524 if(s->xvid_build && s->xvid_build<=1)
525 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
526
527 if(s->xvid_build && s->xvid_build<=12)
528 s->workaround_bugs|= FF_BUG_EDGE;
529
530 #define SET_QPEL_FUNC(postfix1, postfix2) \
531 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
532 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
533 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
534
535 if(s->lavc_build && s->lavc_build<4653)
536 s->workaround_bugs|= FF_BUG_STD_QPEL;
537
538 if(s->lavc_build && s->lavc_build<4655)
539 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
540
541 if(s->lavc_build && s->lavc_build<4670){
542 s->workaround_bugs|= FF_BUG_EDGE;
543 }
544
545 if(s->divx_version)
546 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
547 //printf("padding_bug_score: %d\n", s->padding_bug_score);
548 if(s->divx_version==501 && s->divx_build==20020416)
549 s->padding_bug_score= 256*256*256*64;
550
551 if(s->divx_version && s->divx_version<500){
552 s->workaround_bugs|= FF_BUG_EDGE;
553 }
554
555 #if 0
556 if(s->divx_version==500)
557 s->padding_bug_score= 256*256*256*64;
558
559 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
560 * lets hope this at least works
561 */
562 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
563 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
564 s->workaround_bugs|= FF_BUG_NO_PADDING;
565
566 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
567 s->workaround_bugs|= FF_BUG_NO_PADDING;
568 #endif
569 }
570
571 if(s->workaround_bugs& FF_BUG_STD_QPEL){
572 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
573 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
574 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
575 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
576 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
577 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
578
579 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
580 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
581 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
582 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
583 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
584 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
585 }
586
587 if(avctx->debug & FF_DEBUG_BUGS)
588 printf("bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
589 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
590 s->divx_packed ? "p" : "");
591
592 #if 0 // dump bits per frame / qp / complexity
593 {
594 static FILE *f=NULL;
595 if(!f) f=fopen("rate_qp_cplx.txt", "w");
596 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
597 }
598 #endif
599
600 /* After H263 & mpeg4 header decode we have the height, width,*/
601 /* and other parameters. So then we could init the picture */
602 /* FIXME: By the way H263 decoder is evolving it should have */
603 /* an H263EncContext */
604
605 if ( s->width != avctx->width || s->height != avctx->height) {
606 /* H.263 could change picture size any time */
607 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
608 s->parse_context.buffer=0;
609 MPV_common_end(s);
610 s->parse_context= pc;
611 }
612 if (!s->context_initialized) {
613 avctx->width = s->width;
614 avctx->height = s->height;
615
616 goto retry;
617 }
618
619 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
620 s->gob_index = ff_h263_get_gob_height(s);
621
622 // for hurry_up==5
623 s->current_picture.pict_type= s->pict_type;
624 s->current_picture.key_frame= s->pict_type == I_TYPE;
625
626 /* skip b frames if we dont have reference frames */
627 if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
628 /* skip b frames if we are in a hurry */
629 if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
630 /* skip everything if we are in a hurry>=5 */
631 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
632
633 if(s->next_p_frame_damaged){
634 if(s->pict_type==B_TYPE)
635 return get_consumed_bytes(s, buf_size);
636 else
637 s->next_p_frame_damaged=0;
638 }
639
640 if(MPV_frame_start(s, avctx) < 0)
641 return -1;
642
643 #ifdef DEBUG
644 printf("qscale=%d\n", s->qscale);
645 #endif
646
647 ff_er_frame_start(s);
648
649 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
650 //which isnt available before MPV_frame_start()
651 if (s->msmpeg4_version==5){
652 if(ff_wmv2_decode_secondary_picture_header(s) < 0)
653 return -1;
654 }
655
656 /* decode each macroblock */
657 s->mb_x=0;
658 s->mb_y=0;
659
660 decode_slice(s);
661 while(s->mb_y<s->mb_height){
662 if(s->msmpeg4_version){
663 if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
664 break;
665 }else{
666 if(ff_h263_resync(s)<0)
667 break;
668 }
669
670 if(s->msmpeg4_version<4 && s->h263_pred)
671 ff_mpeg4_clean_buffers(s);
672
673 decode_slice(s);
674 }
675
676 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
677 if(msmpeg4_decode_ext_header(s, buf_size) < 0){
678 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
679 }
680
681 /* divx 5.01+ bistream reorder stuff */
682 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
683 int current_pos= get_bits_count(&s->gb)>>3;
684
685 if( buf_size - current_pos > 5
686 && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
687 int i;
688 int startcode_found=0;
689 for(i=current_pos; i<buf_size-3; i++){
690 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
691 startcode_found=1;
692 break;
693 }
694 }
695 if(startcode_found){
696 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
697 s->bitstream_buffer_size= buf_size - current_pos;
698 }
699 }
700 }
701
702 ff_er_frame_end(s);
703
704 MPV_frame_end(s);
705
706 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
707 assert(s->current_picture.pict_type == s->pict_type);
708 if(s->pict_type==B_TYPE || s->low_delay){
709 *pict= *(AVFrame*)&s->current_picture;
710 ff_print_debug_info(s, s->current_picture_ptr);
711 } else {
712 *pict= *(AVFrame*)&s->last_picture;
713 ff_print_debug_info(s, s->last_picture_ptr);
714 }
715
716 /* Return the Picture timestamp as the frame number */
717 /* we substract 1 because it is added on utils.c */
718 avctx->frame_number = s->picture_number - 1;
719
720 /* dont output the last pic after seeking */
721 if(s->last_picture_ptr || s->low_delay)
722 *data_size = sizeof(AVFrame);
723 #ifdef PRINT_FRAME_TIME
724 printf("%Ld\n", rdtsc()-time);
725 #endif
726
727 return get_consumed_bytes(s, buf_size);
728 }
729
730 static const AVOption mpeg4_decoptions[] =
731 {
732 AVOPTION_SUB(avoptions_workaround_bug),
733 AVOPTION_END()
734 };
735
736 AVCodec mpeg4_decoder = {
737 "mpeg4",
738 CODEC_TYPE_VIDEO,
739 CODEC_ID_MPEG4,
740 sizeof(MpegEncContext),
741 ff_h263_decode_init,
742 NULL,
743 ff_h263_decode_end,
744 ff_h263_decode_frame,
745 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
746 .options = mpeg4_decoptions,
747 .flush= ff_mpeg_flush,
748 };
749
750 AVCodec h263_decoder = {
751 "h263",
752 CODEC_TYPE_VIDEO,
753 CODEC_ID_H263,
754 sizeof(MpegEncContext),
755 ff_h263_decode_init,
756 NULL,
757 ff_h263_decode_end,
758 ff_h263_decode_frame,
759 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
760 .flush= ff_mpeg_flush,
761 };
762
763 AVCodec msmpeg4v1_decoder = {
764 "msmpeg4v1",
765 CODEC_TYPE_VIDEO,
766 CODEC_ID_MSMPEG4V1,
767 sizeof(MpegEncContext),
768 ff_h263_decode_init,
769 NULL,
770 ff_h263_decode_end,
771 ff_h263_decode_frame,
772 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
773 mpeg4_decoptions,
774 };
775
776 AVCodec msmpeg4v2_decoder = {
777 "msmpeg4v2",
778 CODEC_TYPE_VIDEO,
779 CODEC_ID_MSMPEG4V2,
780 sizeof(MpegEncContext),
781 ff_h263_decode_init,
782 NULL,
783 ff_h263_decode_end,
784 ff_h263_decode_frame,
785 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
786 mpeg4_decoptions,
787 };
788
789 AVCodec msmpeg4v3_decoder = {
790 "msmpeg4",
791 CODEC_TYPE_VIDEO,
792 CODEC_ID_MSMPEG4V3,
793 sizeof(MpegEncContext),
794 ff_h263_decode_init,
795 NULL,
796 ff_h263_decode_end,
797 ff_h263_decode_frame,
798 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
799 .options = mpeg4_decoptions,
800 };
801
802 AVCodec wmv1_decoder = {
803 "wmv1",
804 CODEC_TYPE_VIDEO,
805 CODEC_ID_WMV1,
806 sizeof(MpegEncContext),
807 ff_h263_decode_init,
808 NULL,
809 ff_h263_decode_end,
810 ff_h263_decode_frame,
811 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
812 mpeg4_decoptions,
813 };
814
815 AVCodec h263i_decoder = {
816 "h263i",
817 CODEC_TYPE_VIDEO,
818 CODEC_ID_H263I,
819 sizeof(MpegEncContext),
820 ff_h263_decode_init,
821 NULL,
822 ff_h263_decode_end,
823 ff_h263_decode_frame,
824 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
825 mpeg4_decoptions,
826 };
827
828 AVCodec flv_decoder = {
829 "flv",
830 CODEC_TYPE_VIDEO,
831 CODEC_ID_FLV1,
832 sizeof(MpegEncContext),
833 ff_h263_decode_init,
834 NULL,
835 ff_h263_decode_end,
836 ff_h263_decode_frame,
837 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
838 };