--enable/disable parsers. Warning: some combinations are broken.
[libav.git] / libavcodec / h263dec.c
1 /*
2 * H.263 decoder
3 * Copyright (c) 2001 Fabrice Bellard.
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This library 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 of the License, or (at your option) any later version.
10 *
11 * This library 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 this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file h263dec.c
23 * H.263 decoder.
24 */
25
26 #include "avcodec.h"
27 #include "dsputil.h"
28 #include "mpegvideo.h"
29
30 //#define DEBUG
31 //#define PRINT_FRAME_TIME
32
33 int ff_h263_decode_init(AVCodecContext *avctx)
34 {
35 MpegEncContext *s = avctx->priv_data;
36
37 s->avctx = avctx;
38 s->out_format = FMT_H263;
39
40 s->width = avctx->coded_width;
41 s->height = avctx->coded_height;
42 s->workaround_bugs= avctx->workaround_bugs;
43
44 // set defaults
45 MPV_decode_defaults(s);
46 s->quant_precision=5;
47 s->decode_mb= ff_h263_decode_mb;
48 s->low_delay= 1;
49 avctx->pix_fmt= PIX_FMT_YUV420P;
50 s->unrestricted_mv= 1;
51
52 /* select sub codec */
53 switch(avctx->codec->id) {
54 case CODEC_ID_H263:
55 s->unrestricted_mv= 0;
56 break;
57 case CODEC_ID_MPEG4:
58 s->decode_mb= ff_mpeg4_decode_mb;
59 s->time_increment_bits = 4; /* default value for broken headers */
60 s->h263_pred = 1;
61 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
62 break;
63 case CODEC_ID_MSMPEG4V1:
64 s->h263_msmpeg4 = 1;
65 s->h263_pred = 1;
66 s->msmpeg4_version=1;
67 break;
68 case CODEC_ID_MSMPEG4V2:
69 s->h263_msmpeg4 = 1;
70 s->h263_pred = 1;
71 s->msmpeg4_version=2;
72 break;
73 case CODEC_ID_MSMPEG4V3:
74 s->h263_msmpeg4 = 1;
75 s->h263_pred = 1;
76 s->msmpeg4_version=3;
77 break;
78 case CODEC_ID_WMV1:
79 s->h263_msmpeg4 = 1;
80 s->h263_pred = 1;
81 s->msmpeg4_version=4;
82 break;
83 case CODEC_ID_WMV2:
84 s->h263_msmpeg4 = 1;
85 s->h263_pred = 1;
86 s->msmpeg4_version=5;
87 break;
88 case CODEC_ID_VC1:
89 case CODEC_ID_WMV3:
90 s->h263_msmpeg4 = 1;
91 s->h263_pred = 1;
92 s->msmpeg4_version=6;
93 break;
94 case CODEC_ID_H263I:
95 break;
96 case CODEC_ID_FLV1:
97 s->h263_flv = 1;
98 break;
99 default:
100 return -1;
101 }
102 s->codec_id= avctx->codec->id;
103
104 /* for h263, we allocate the images after having read the header */
105 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
106 if (MPV_common_init(s) < 0)
107 return -1;
108
109 if (s->h263_msmpeg4)
110 ff_msmpeg4_decode_init(s);
111 else
112 h263_decode_init_vlc(s);
113
114 return 0;
115 }
116
117 int ff_h263_decode_end(AVCodecContext *avctx)
118 {
119 MpegEncContext *s = avctx->priv_data;
120
121 MPV_common_end(s);
122 return 0;
123 }
124
125 /**
126 * returns the number of bytes consumed for building the current frame
127 */
128 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
129 int pos= (get_bits_count(&s->gb)+7)>>3;
130
131 if(s->divx_packed){
132 //we would have to scan through the whole buf to handle the weird reordering ...
133 return buf_size;
134 }else if(s->flags&CODEC_FLAG_TRUNCATED){
135 pos -= s->parse_context.last_index;
136 if(pos<0) pos=0; // padding is not really read so this might be -1
137 return pos;
138 }else{
139 if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
140 if(pos+10>buf_size) pos=buf_size; // oops ;)
141
142 return pos;
143 }
144 }
145
146 static int decode_slice(MpegEncContext *s){
147 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
148 const int mb_size= 16>>s->avctx->lowres;
149 s->last_resync_gb= s->gb;
150 s->first_slice_line= 1;
151
152 s->resync_mb_x= s->mb_x;
153 s->resync_mb_y= s->mb_y;
154
155 ff_set_qscale(s, s->qscale);
156
157 if(s->partitioned_frame){
158 const int qscale= s->qscale;
159
160 if(s->codec_id==CODEC_ID_MPEG4){
161 if(ff_mpeg4_decode_partitions(s) < 0)
162 return -1;
163 }
164
165 /* restore variables which were modified */
166 s->first_slice_line=1;
167 s->mb_x= s->resync_mb_x;
168 s->mb_y= s->resync_mb_y;
169 ff_set_qscale(s, qscale);
170 }
171
172 for(; s->mb_y < s->mb_height; s->mb_y++) {
173 /* per-row end of slice checks */
174 if(s->msmpeg4_version){
175 if(s->resync_mb_y + s->slice_height == s->mb_y){
176 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);
177
178 return 0;
179 }
180 }
181
182 if(s->msmpeg4_version==1){
183 s->last_dc[0]=
184 s->last_dc[1]=
185 s->last_dc[2]= 128;
186 }
187
188 ff_init_block_index(s);
189 for(; s->mb_x < s->mb_width; s->mb_x++) {
190 int ret;
191
192 ff_update_block_index(s);
193
194 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
195 s->first_slice_line=0;
196 }
197
198 /* DCT & quantize */
199
200 s->mv_dir = MV_DIR_FORWARD;
201 s->mv_type = MV_TYPE_16X16;
202 // s->mb_skipped = 0;
203 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
204 ret= s->decode_mb(s, s->block);
205
206 if (s->pict_type!=B_TYPE)
207 ff_h263_update_motion_val(s);
208
209 if(ret<0){
210 const int xy= s->mb_x + s->mb_y*s->mb_stride;
211 if(ret==SLICE_END){
212 MPV_decode_mb(s, s->block);
213 if(s->loop_filter)
214 ff_h263_loop_filter(s);
215
216 //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));
217 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);
218
219 s->padding_bug_score--;
220
221 if(++s->mb_x >= s->mb_width){
222 s->mb_x=0;
223 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
224 s->mb_y++;
225 }
226 return 0;
227 }else if(ret==SLICE_NOEND){
228 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
229 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);
230 return -1;
231 }
232 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
233 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);
234
235 return -1;
236 }
237
238 MPV_decode_mb(s, s->block);
239 if(s->loop_filter)
240 ff_h263_loop_filter(s);
241 }
242
243 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
244
245 s->mb_x= 0;
246 }
247
248 assert(s->mb_x==0 && s->mb_y==s->mb_height);
249
250 /* try to detect the padding bug */
251 if( s->codec_id==CODEC_ID_MPEG4
252 && (s->workaround_bugs&FF_BUG_AUTODETECT)
253 && s->gb.size_in_bits - get_bits_count(&s->gb) >=0
254 && s->gb.size_in_bits - get_bits_count(&s->gb) < 48
255 // && !s->resync_marker
256 && !s->data_partitioning){
257
258 const int bits_count= get_bits_count(&s->gb);
259 const int bits_left = s->gb.size_in_bits - bits_count;
260
261 if(bits_left==0){
262 s->padding_bug_score+=16;
263 } else if(bits_left != 1){
264 int v= show_bits(&s->gb, 8);
265 v|= 0x7F >> (7-(bits_count&7));
266
267 if(v==0x7F && bits_left<=8)
268 s->padding_bug_score--;
269 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
270 s->padding_bug_score+= 4;
271 else
272 s->padding_bug_score++;
273 }
274 }
275
276 if(s->workaround_bugs&FF_BUG_AUTODETECT){
277 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
278 s->workaround_bugs |= FF_BUG_NO_PADDING;
279 else
280 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
281 }
282
283 // handle formats which don't have unique end markers
284 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
285 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
286 int max_extra=7;
287
288 /* no markers in M$ crap */
289 if(s->msmpeg4_version && s->pict_type==I_TYPE)
290 max_extra+= 17;
291
292 /* buggy padding but the frame should still end approximately at the bitstream end */
293 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
294 max_extra+= 48;
295 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
296 max_extra+= 256*256*256*64;
297
298 if(left>max_extra){
299 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
300 }
301 else if(left<0){
302 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
303 }else
304 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);
305
306 return 0;
307 }
308
309 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
310 s->gb.size_in_bits - get_bits_count(&s->gb),
311 show_bits(&s->gb, 24), s->padding_bug_score);
312
313 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);
314
315 return -1;
316 }
317
318 /**
319 * finds the end of the current frame in the bitstream.
320 * @return the position of the first byte of the next frame, or -1
321 */
322 int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
323 int vop_found, i;
324 uint32_t state;
325
326 vop_found= pc->frame_start_found;
327 state= pc->state;
328
329 i=0;
330 if(!vop_found){
331 for(i=0; i<buf_size; i++){
332 state= (state<<8) | buf[i];
333 if(state == 0x1B6){
334 i++;
335 vop_found=1;
336 break;
337 }
338 }
339 }
340
341 if(vop_found){
342 /* EOF considered as end of frame */
343 if (buf_size == 0)
344 return 0;
345 for(; i<buf_size; i++){
346 state= (state<<8) | buf[i];
347 if((state&0xFFFFFF00) == 0x100){
348 pc->frame_start_found=0;
349 pc->state=-1;
350 return i-3;
351 }
352 }
353 }
354 pc->frame_start_found= vop_found;
355 pc->state= state;
356 return END_NOT_FOUND;
357 }
358
359 static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
360 int vop_found, i;
361 uint32_t state;
362
363 vop_found= pc->frame_start_found;
364 state= pc->state;
365
366 i=0;
367 if(!vop_found){
368 for(i=0; i<buf_size; i++){
369 state= (state<<8) | buf[i];
370 if(state>>(32-22) == 0x20){
371 i++;
372 vop_found=1;
373 break;
374 }
375 }
376 }
377
378 if(vop_found){
379 for(; i<buf_size; i++){
380 state= (state<<8) | buf[i];
381 if(state>>(32-22) == 0x20){
382 pc->frame_start_found=0;
383 pc->state=-1;
384 return i-3;
385 }
386 }
387 }
388 pc->frame_start_found= vop_found;
389 pc->state= state;
390
391 return END_NOT_FOUND;
392 }
393
394 #ifdef CONFIG_H263_PARSER
395 static int h263_parse(AVCodecParserContext *s,
396 AVCodecContext *avctx,
397 uint8_t **poutbuf, int *poutbuf_size,
398 const uint8_t *buf, int buf_size)
399 {
400 ParseContext *pc = s->priv_data;
401 int next;
402
403 next= h263_find_frame_end(pc, buf, buf_size);
404
405 if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
406 *poutbuf = NULL;
407 *poutbuf_size = 0;
408 return buf_size;
409 }
410
411 *poutbuf = (uint8_t *)buf;
412 *poutbuf_size = buf_size;
413 return next;
414 }
415 #endif
416
417 int ff_h263_decode_frame(AVCodecContext *avctx,
418 void *data, int *data_size,
419 uint8_t *buf, int buf_size)
420 {
421 MpegEncContext *s = avctx->priv_data;
422 int ret;
423 AVFrame *pict = data;
424
425 #ifdef PRINT_FRAME_TIME
426 uint64_t time= rdtsc();
427 #endif
428 #ifdef DEBUG
429 printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
430 printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
431 #endif
432 s->flags= avctx->flags;
433 s->flags2= avctx->flags2;
434
435 /* no supplementary picture */
436 if (buf_size == 0) {
437 /* special case for last picture */
438 if (s->low_delay==0 && s->next_picture_ptr) {
439 *pict= *(AVFrame*)s->next_picture_ptr;
440 s->next_picture_ptr= NULL;
441
442 *data_size = sizeof(AVFrame);
443 }
444
445 return 0;
446 }
447
448 if(s->flags&CODEC_FLAG_TRUNCATED){
449 int next;
450
451 if(s->codec_id==CODEC_ID_MPEG4){
452 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
453 }else if(s->codec_id==CODEC_ID_H263){
454 next= h263_find_frame_end(&s->parse_context, buf, buf_size);
455 }else{
456 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
457 return -1;
458 }
459
460 if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
461 return buf_size;
462 }
463
464
465 retry:
466
467 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
468 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
469 }else
470 init_get_bits(&s->gb, buf, buf_size*8);
471 s->bitstream_buffer_size=0;
472
473 if (!s->context_initialized) {
474 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
475 return -1;
476 }
477
478 //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
479 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
480 int i= ff_find_unused_picture(s, 0);
481 s->current_picture_ptr= &s->picture[i];
482 }
483
484 /* let's go :-) */
485 if (s->msmpeg4_version==5) {
486 ret= ff_wmv2_decode_picture_header(s);
487 } else if (s->msmpeg4_version) {
488 ret = msmpeg4_decode_picture_header(s);
489 } else if (s->h263_pred) {
490 if(s->avctx->extradata_size && s->picture_number==0){
491 GetBitContext gb;
492
493 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
494 ret = ff_mpeg4_decode_picture_header(s, &gb);
495 }
496 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
497
498 if(s->flags& CODEC_FLAG_LOW_DELAY)
499 s->low_delay=1;
500 } else if (s->codec_id == CODEC_ID_H263I) {
501 ret = intel_h263_decode_picture_header(s);
502 } else if (s->h263_flv) {
503 ret = flv_h263_decode_picture_header(s);
504 } else {
505 ret = h263_decode_picture_header(s);
506 }
507
508 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
509
510 /* skip if the header was thrashed */
511 if (ret < 0){
512 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
513 return -1;
514 }
515
516 avctx->has_b_frames= !s->low_delay;
517
518 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
519 if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
520 s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX") ||
521 s->avctx->codec_tag == ff_get_fourcc("RMP4"))
522 s->xvid_build= -1;
523 #if 0
524 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
525 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
526 s->xvid_build= -1;
527 #endif
528 }
529
530 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
531 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
532 s->divx_version= 400; //divx 4
533 }
534
535 if(s->xvid_build && s->divx_version){
536 s->divx_version=
537 s->divx_build= 0;
538 }
539
540 if(s->workaround_bugs&FF_BUG_AUTODETECT){
541 if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
542 s->workaround_bugs|= FF_BUG_XVID_ILACE;
543
544 if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
545 s->workaround_bugs|= FF_BUG_UMP4;
546 }
547
548 if(s->divx_version>=500){
549 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
550 }
551
552 if(s->divx_version>502){
553 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
554 }
555
556 if(s->xvid_build && s->xvid_build<=3)
557 s->padding_bug_score= 256*256*256*64;
558
559 if(s->xvid_build && s->xvid_build<=1)
560 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
561
562 if(s->xvid_build && s->xvid_build<=12)
563 s->workaround_bugs|= FF_BUG_EDGE;
564
565 if(s->xvid_build && s->xvid_build<=32)
566 s->workaround_bugs|= FF_BUG_DC_CLIP;
567
568 #define SET_QPEL_FUNC(postfix1, postfix2) \
569 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
570 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
571 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
572
573 if(s->lavc_build && s->lavc_build<4653)
574 s->workaround_bugs|= FF_BUG_STD_QPEL;
575
576 if(s->lavc_build && s->lavc_build<4655)
577 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
578
579 if(s->lavc_build && s->lavc_build<4670){
580 s->workaround_bugs|= FF_BUG_EDGE;
581 }
582
583 if(s->lavc_build && s->lavc_build<=4712)
584 s->workaround_bugs|= FF_BUG_DC_CLIP;
585
586 if(s->divx_version)
587 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
588 //printf("padding_bug_score: %d\n", s->padding_bug_score);
589 if(s->divx_version==501 && s->divx_build==20020416)
590 s->padding_bug_score= 256*256*256*64;
591
592 if(s->divx_version && s->divx_version<500){
593 s->workaround_bugs|= FF_BUG_EDGE;
594 }
595
596 if(s->divx_version)
597 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
598 #if 0
599 if(s->divx_version==500)
600 s->padding_bug_score= 256*256*256*64;
601
602 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
603 * lets hope this at least works
604 */
605 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
606 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
607 s->workaround_bugs|= FF_BUG_NO_PADDING;
608
609 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
610 s->workaround_bugs|= FF_BUG_NO_PADDING;
611 #endif
612 }
613
614 if(s->workaround_bugs& FF_BUG_STD_QPEL){
615 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
616 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
617 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
618 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
619 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
620 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
621
622 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
623 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
624 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
625 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
626 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
627 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
628 }
629
630 if(avctx->debug & FF_DEBUG_BUGS)
631 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
632 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
633 s->divx_packed ? "p" : "");
634
635 #if 0 // dump bits per frame / qp / complexity
636 {
637 static FILE *f=NULL;
638 if(!f) f=fopen("rate_qp_cplx.txt", "w");
639 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
640 }
641 #endif
642
643 #if defined(HAVE_MMX) && defined(CONFIG_GPL)
644 if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX)){
645 avctx->idct_algo= FF_IDCT_XVIDMMX;
646 avctx->coded_width= 0; // force reinit
647 // dsputil_init(&s->dsp, avctx);
648 s->picture_number=0;
649 }
650 #endif
651
652 /* After H263 & mpeg4 header decode we have the height, width,*/
653 /* and other parameters. So then we could init the picture */
654 /* FIXME: By the way H263 decoder is evolving it should have */
655 /* an H263EncContext */
656
657 if ( s->width != avctx->coded_width
658 || s->height != avctx->coded_height) {
659 /* H.263 could change picture size any time */
660 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
661 s->parse_context.buffer=0;
662 MPV_common_end(s);
663 s->parse_context= pc;
664 }
665 if (!s->context_initialized) {
666 avcodec_set_dimensions(avctx, s->width, s->height);
667
668 goto retry;
669 }
670
671 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
672 s->gob_index = ff_h263_get_gob_height(s);
673
674 // for hurry_up==5
675 s->current_picture.pict_type= s->pict_type;
676 s->current_picture.key_frame= s->pict_type == I_TYPE;
677
678 /* skip B-frames if we don't have reference frames */
679 if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
680 /* skip b frames if we are in a hurry */
681 if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
682 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
683 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
684 || avctx->skip_frame >= AVDISCARD_ALL)
685 return get_consumed_bytes(s, buf_size);
686 /* skip everything if we are in a hurry>=5 */
687 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
688
689 if(s->next_p_frame_damaged){
690 if(s->pict_type==B_TYPE)
691 return get_consumed_bytes(s, buf_size);
692 else
693 s->next_p_frame_damaged=0;
694 }
695
696 if(MPV_frame_start(s, avctx) < 0)
697 return -1;
698
699 #ifdef DEBUG
700 av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
701 #endif
702
703 ff_er_frame_start(s);
704
705 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
706 //which isnt available before MPV_frame_start()
707 if (s->msmpeg4_version==5){
708 if(ff_wmv2_decode_secondary_picture_header(s) < 0)
709 return -1;
710 }
711
712 /* decode each macroblock */
713 s->mb_x=0;
714 s->mb_y=0;
715
716 decode_slice(s);
717 while(s->mb_y<s->mb_height){
718 if(s->msmpeg4_version){
719 if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
720 break;
721 }else{
722 if(ff_h263_resync(s)<0)
723 break;
724 }
725
726 if(s->msmpeg4_version<4 && s->h263_pred)
727 ff_mpeg4_clean_buffers(s);
728
729 decode_slice(s);
730 }
731
732 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
733 if(msmpeg4_decode_ext_header(s, buf_size) < 0){
734 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
735 }
736
737 /* divx 5.01+ bistream reorder stuff */
738 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
739 int current_pos= get_bits_count(&s->gb)>>3;
740 int startcode_found=0;
741
742 if(buf_size - current_pos > 5){
743 int i;
744 for(i=current_pos; i<buf_size-3; i++){
745 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
746 startcode_found=1;
747 break;
748 }
749 }
750 }
751 if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
752 startcode_found=1;
753 current_pos=0;
754 }
755
756 if(startcode_found){
757 s->bitstream_buffer= av_fast_realloc(
758 s->bitstream_buffer,
759 &s->allocated_bitstream_buffer_size,
760 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
761 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
762 s->bitstream_buffer_size= buf_size - current_pos;
763 }
764 }
765
766 ff_er_frame_end(s);
767
768 MPV_frame_end(s);
769
770 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
771 assert(s->current_picture.pict_type == s->pict_type);
772 if (s->pict_type == B_TYPE || s->low_delay) {
773 *pict= *(AVFrame*)s->current_picture_ptr;
774 } else if (s->last_picture_ptr != NULL) {
775 *pict= *(AVFrame*)s->last_picture_ptr;
776 }
777
778 if(s->last_picture_ptr || s->low_delay){
779 *data_size = sizeof(AVFrame);
780 ff_print_debug_info(s, pict);
781 }
782
783 /* Return the Picture timestamp as the frame number */
784 /* we substract 1 because it is added on utils.c */
785 avctx->frame_number = s->picture_number - 1;
786
787 #ifdef PRINT_FRAME_TIME
788 av_log(avctx, AV_LOG_DEBUG, "%Ld\n", rdtsc()-time);
789 #endif
790
791 return get_consumed_bytes(s, buf_size);
792 }
793
794 AVCodec mpeg4_decoder = {
795 "mpeg4",
796 CODEC_TYPE_VIDEO,
797 CODEC_ID_MPEG4,
798 sizeof(MpegEncContext),
799 ff_h263_decode_init,
800 NULL,
801 ff_h263_decode_end,
802 ff_h263_decode_frame,
803 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
804 .flush= ff_mpeg_flush,
805 };
806
807 AVCodec h263_decoder = {
808 "h263",
809 CODEC_TYPE_VIDEO,
810 CODEC_ID_H263,
811 sizeof(MpegEncContext),
812 ff_h263_decode_init,
813 NULL,
814 ff_h263_decode_end,
815 ff_h263_decode_frame,
816 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
817 .flush= ff_mpeg_flush,
818 };
819
820 AVCodec msmpeg4v1_decoder = {
821 "msmpeg4v1",
822 CODEC_TYPE_VIDEO,
823 CODEC_ID_MSMPEG4V1,
824 sizeof(MpegEncContext),
825 ff_h263_decode_init,
826 NULL,
827 ff_h263_decode_end,
828 ff_h263_decode_frame,
829 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
830 };
831
832 AVCodec msmpeg4v2_decoder = {
833 "msmpeg4v2",
834 CODEC_TYPE_VIDEO,
835 CODEC_ID_MSMPEG4V2,
836 sizeof(MpegEncContext),
837 ff_h263_decode_init,
838 NULL,
839 ff_h263_decode_end,
840 ff_h263_decode_frame,
841 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
842 };
843
844 AVCodec msmpeg4v3_decoder = {
845 "msmpeg4",
846 CODEC_TYPE_VIDEO,
847 CODEC_ID_MSMPEG4V3,
848 sizeof(MpegEncContext),
849 ff_h263_decode_init,
850 NULL,
851 ff_h263_decode_end,
852 ff_h263_decode_frame,
853 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
854 };
855
856 AVCodec wmv1_decoder = {
857 "wmv1",
858 CODEC_TYPE_VIDEO,
859 CODEC_ID_WMV1,
860 sizeof(MpegEncContext),
861 ff_h263_decode_init,
862 NULL,
863 ff_h263_decode_end,
864 ff_h263_decode_frame,
865 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
866 };
867
868 AVCodec h263i_decoder = {
869 "h263i",
870 CODEC_TYPE_VIDEO,
871 CODEC_ID_H263I,
872 sizeof(MpegEncContext),
873 ff_h263_decode_init,
874 NULL,
875 ff_h263_decode_end,
876 ff_h263_decode_frame,
877 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
878 };
879
880 AVCodec flv_decoder = {
881 "flv",
882 CODEC_TYPE_VIDEO,
883 CODEC_ID_FLV1,
884 sizeof(MpegEncContext),
885 ff_h263_decode_init,
886 NULL,
887 ff_h263_decode_end,
888 ff_h263_decode_frame,
889 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
890 };
891
892 #ifdef CONFIG_H263_PARSER
893 AVCodecParser h263_parser = {
894 { CODEC_ID_H263 },
895 sizeof(ParseContext),
896 NULL,
897 h263_parse,
898 ff_parse_close,
899 };
900 #endif