AVOption removial patch from (James A. Morrison >ja2morri csclub.uwaterloo ca>)
[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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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_WMV3:
89 s->h263_msmpeg4 = 1;
90 s->h263_pred = 1;
91 s->msmpeg4_version=6;
92 break;
93 case CODEC_ID_H263I:
94 break;
95 case CODEC_ID_FLV1:
96 s->h263_flv = 1;
97 break;
98 default:
99 return -1;
100 }
101 s->codec_id= avctx->codec->id;
102
103 /* for h263, we allocate the images after having read the header */
104 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
105 if (MPV_common_init(s) < 0)
106 return -1;
107
108 if (s->h263_msmpeg4)
109 ff_msmpeg4_decode_init(s);
110 else
111 h263_decode_init_vlc(s);
112
113 return 0;
114 }
115
116 int ff_h263_decode_end(AVCodecContext *avctx)
117 {
118 MpegEncContext *s = avctx->priv_data;
119
120 MPV_common_end(s);
121 return 0;
122 }
123
124 /**
125 * retunrs the number of bytes consumed for building the current frame
126 */
127 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
128 int pos= (get_bits_count(&s->gb)+7)>>3;
129
130 if(s->divx_packed){
131 //we would have to scan through the whole buf to handle the weird reordering ...
132 return buf_size;
133 }else if(s->flags&CODEC_FLAG_TRUNCATED){
134 pos -= s->parse_context.last_index;
135 if(pos<0) pos=0; // padding is not really read so this might be -1
136 return pos;
137 }else{
138 if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
139 if(pos+10>buf_size) pos=buf_size; // oops ;)
140
141 return pos;
142 }
143 }
144
145 static int decode_slice(MpegEncContext *s){
146 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
147 const int mb_size= 16>>s->avctx->lowres;
148 s->last_resync_gb= s->gb;
149 s->first_slice_line= 1;
150
151 s->resync_mb_x= s->mb_x;
152 s->resync_mb_y= s->mb_y;
153
154 ff_set_qscale(s, s->qscale);
155
156 if(s->partitioned_frame){
157 const int qscale= s->qscale;
158
159 if(s->codec_id==CODEC_ID_MPEG4){
160 if(ff_mpeg4_decode_partitions(s) < 0)
161 return -1;
162 }
163
164 /* restore variables which were modified */
165 s->first_slice_line=1;
166 s->mb_x= s->resync_mb_x;
167 s->mb_y= s->resync_mb_y;
168 ff_set_qscale(s, qscale);
169 }
170
171 for(; s->mb_y < s->mb_height; s->mb_y++) {
172 /* per-row end of slice checks */
173 if(s->msmpeg4_version){
174 if(s->resync_mb_y + s->slice_height == s->mb_y){
175 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);
176
177 return 0;
178 }
179 }
180
181 if(s->msmpeg4_version==1){
182 s->last_dc[0]=
183 s->last_dc[1]=
184 s->last_dc[2]= 128;
185 }
186
187 ff_init_block_index(s);
188 for(; s->mb_x < s->mb_width; s->mb_x++) {
189 int ret;
190
191 ff_update_block_index(s);
192
193 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
194 s->first_slice_line=0;
195 }
196
197 /* DCT & quantize */
198 s->dsp.clear_blocks(s->block[0]);
199
200 s->mv_dir = MV_DIR_FORWARD;
201 s->mv_type = MV_TYPE_16X16;
202 // s->mb_skiped = 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 dont 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 static int h263_parse(AVCodecParserContext *s,
395 AVCodecContext *avctx,
396 uint8_t **poutbuf, int *poutbuf_size,
397 const uint8_t *buf, int buf_size)
398 {
399 ParseContext *pc = s->priv_data;
400 int next;
401
402 next= h263_find_frame_end(pc, buf, buf_size);
403
404 if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
405 *poutbuf = NULL;
406 *poutbuf_size = 0;
407 return buf_size;
408 }
409
410 *poutbuf = (uint8_t *)buf;
411 *poutbuf_size = buf_size;
412 return next;
413 }
414
415 int ff_h263_decode_frame(AVCodecContext *avctx,
416 void *data, int *data_size,
417 uint8_t *buf, int buf_size)
418 {
419 MpegEncContext *s = avctx->priv_data;
420 int ret;
421 AVFrame *pict = data;
422
423 #ifdef PRINT_FRAME_TIME
424 uint64_t time= rdtsc();
425 #endif
426 #ifdef DEBUG
427 printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
428 printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
429 #endif
430 s->flags= avctx->flags;
431 s->flags2= avctx->flags2;
432
433 /* no supplementary picture */
434 if (buf_size == 0) {
435 /* special case for last picture */
436 if (s->low_delay==0 && s->next_picture_ptr) {
437 *pict= *(AVFrame*)s->next_picture_ptr;
438 s->next_picture_ptr= NULL;
439
440 *data_size = sizeof(AVFrame);
441 }
442
443 return 0;
444 }
445
446 if(s->flags&CODEC_FLAG_TRUNCATED){
447 int next;
448
449 if(s->codec_id==CODEC_ID_MPEG4){
450 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
451 }else if(s->codec_id==CODEC_ID_H263){
452 next= h263_find_frame_end(&s->parse_context, buf, buf_size);
453 }else{
454 av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
455 return -1;
456 }
457
458 if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
459 return buf_size;
460 }
461
462
463 retry:
464
465 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
466 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
467 }else
468 init_get_bits(&s->gb, buf, buf_size*8);
469 s->bitstream_buffer_size=0;
470
471 if (!s->context_initialized) {
472 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
473 return -1;
474 }
475
476 //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
477 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
478 int i= ff_find_unused_picture(s, 0);
479 s->current_picture_ptr= &s->picture[i];
480 }
481
482 /* let's go :-) */
483 if (s->msmpeg4_version==5) {
484 ret= ff_wmv2_decode_picture_header(s);
485 } else if (s->msmpeg4_version) {
486 ret = msmpeg4_decode_picture_header(s);
487 } else if (s->h263_pred) {
488 if(s->avctx->extradata_size && s->picture_number==0){
489 GetBitContext gb;
490
491 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
492 ret = ff_mpeg4_decode_picture_header(s, &gb);
493 }
494 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
495
496 if(s->flags& CODEC_FLAG_LOW_DELAY)
497 s->low_delay=1;
498 } else if (s->codec_id == CODEC_ID_H263I) {
499 ret = intel_h263_decode_picture_header(s);
500 } else if (s->h263_flv) {
501 ret = flv_h263_decode_picture_header(s);
502 } else {
503 ret = h263_decode_picture_header(s);
504 }
505
506 if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
507
508 /* skip if the header was thrashed */
509 if (ret < 0){
510 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
511 return -1;
512 }
513
514 avctx->has_b_frames= !s->low_delay;
515
516 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
517 if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
518 s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
519 s->xvid_build= -1;
520 #if 0
521 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
522 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
523 s->xvid_build= -1;
524 #endif
525 }
526
527 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
528 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
529 s->divx_version= 400; //divx 4
530 }
531
532 if(s->xvid_build && s->divx_version){
533 s->divx_version=
534 s->divx_build= 0;
535 }
536
537 if(s->workaround_bugs&FF_BUG_AUTODETECT){
538 if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
539 s->workaround_bugs|= FF_BUG_XVID_ILACE;
540
541 if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
542 s->workaround_bugs|= FF_BUG_UMP4;
543 }
544
545 if(s->divx_version>=500){
546 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
547 }
548
549 if(s->divx_version>502){
550 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
551 }
552
553 if(s->xvid_build && s->xvid_build<=3)
554 s->padding_bug_score= 256*256*256*64;
555
556 if(s->xvid_build && s->xvid_build<=1)
557 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
558
559 if(s->xvid_build && s->xvid_build<=12)
560 s->workaround_bugs|= FF_BUG_EDGE;
561
562 if(s->xvid_build && s->xvid_build<=32)
563 s->workaround_bugs|= FF_BUG_DC_CLIP;
564
565 #define SET_QPEL_FUNC(postfix1, postfix2) \
566 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
567 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
568 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
569
570 if(s->lavc_build && s->lavc_build<4653)
571 s->workaround_bugs|= FF_BUG_STD_QPEL;
572
573 if(s->lavc_build && s->lavc_build<4655)
574 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
575
576 if(s->lavc_build && s->lavc_build<4670){
577 s->workaround_bugs|= FF_BUG_EDGE;
578 }
579
580 if(s->lavc_build && s->lavc_build<=4712)
581 s->workaround_bugs|= FF_BUG_DC_CLIP;
582
583 if(s->divx_version)
584 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
585 //printf("padding_bug_score: %d\n", s->padding_bug_score);
586 if(s->divx_version==501 && s->divx_build==20020416)
587 s->padding_bug_score= 256*256*256*64;
588
589 if(s->divx_version && s->divx_version<500){
590 s->workaround_bugs|= FF_BUG_EDGE;
591 }
592
593 if(s->divx_version)
594 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
595 #if 0
596 if(s->divx_version==500)
597 s->padding_bug_score= 256*256*256*64;
598
599 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
600 * lets hope this at least works
601 */
602 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
603 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
604 s->workaround_bugs|= FF_BUG_NO_PADDING;
605
606 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
607 s->workaround_bugs|= FF_BUG_NO_PADDING;
608 #endif
609 }
610
611 if(s->workaround_bugs& FF_BUG_STD_QPEL){
612 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
613 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
614 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
615 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
616 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
617 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
618
619 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
620 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
621 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
622 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
623 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
624 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
625 }
626
627 if(avctx->debug & FF_DEBUG_BUGS)
628 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
629 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
630 s->divx_packed ? "p" : "");
631
632 #if 0 // dump bits per frame / qp / complexity
633 {
634 static FILE *f=NULL;
635 if(!f) f=fopen("rate_qp_cplx.txt", "w");
636 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
637 }
638 #endif
639
640 #ifdef HAVE_MMX
641 if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX) && !(s->flags&CODEC_FLAG_BITEXACT)){
642 avctx->idct_algo= FF_IDCT_LIBMPEG2MMX;
643 avctx->coded_width= 0; // force reinit
644 }
645 #endif
646
647 /* After H263 & mpeg4 header decode we have the height, width,*/
648 /* and other parameters. So then we could init the picture */
649 /* FIXME: By the way H263 decoder is evolving it should have */
650 /* an H263EncContext */
651
652 if ( s->width != avctx->coded_width
653 || s->height != avctx->coded_height) {
654 /* H.263 could change picture size any time */
655 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
656 s->parse_context.buffer=0;
657 MPV_common_end(s);
658 s->parse_context= pc;
659 }
660 if (!s->context_initialized) {
661 avcodec_set_dimensions(avctx, s->width, s->height);
662
663 goto retry;
664 }
665
666 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
667 s->gob_index = ff_h263_get_gob_height(s);
668
669 // for hurry_up==5
670 s->current_picture.pict_type= s->pict_type;
671 s->current_picture.key_frame= s->pict_type == I_TYPE;
672
673 /* skip b frames if we dont have reference frames */
674 if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
675 /* skip b frames if we are in a hurry */
676 if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
677 /* skip everything if we are in a hurry>=5 */
678 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
679
680 if(s->next_p_frame_damaged){
681 if(s->pict_type==B_TYPE)
682 return get_consumed_bytes(s, buf_size);
683 else
684 s->next_p_frame_damaged=0;
685 }
686
687 if(MPV_frame_start(s, avctx) < 0)
688 return -1;
689
690 #ifdef DEBUG
691 printf("qscale=%d\n", s->qscale);
692 #endif
693
694 ff_er_frame_start(s);
695
696 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
697 //which isnt available before MPV_frame_start()
698 if (s->msmpeg4_version==5){
699 if(ff_wmv2_decode_secondary_picture_header(s) < 0)
700 return -1;
701 }
702
703 /* decode each macroblock */
704 s->mb_x=0;
705 s->mb_y=0;
706
707 decode_slice(s);
708 while(s->mb_y<s->mb_height){
709 if(s->msmpeg4_version){
710 if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
711 break;
712 }else{
713 if(ff_h263_resync(s)<0)
714 break;
715 }
716
717 if(s->msmpeg4_version<4 && s->h263_pred)
718 ff_mpeg4_clean_buffers(s);
719
720 decode_slice(s);
721 }
722
723 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
724 if(msmpeg4_decode_ext_header(s, buf_size) < 0){
725 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
726 }
727
728 /* divx 5.01+ bistream reorder stuff */
729 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
730 int current_pos= get_bits_count(&s->gb)>>3;
731 int startcode_found=0;
732
733 if(buf_size - current_pos > 5){
734 int i;
735 for(i=current_pos; i<buf_size-3; i++){
736 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
737 startcode_found=1;
738 break;
739 }
740 }
741 }
742 if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
743 startcode_found=1;
744 current_pos=0;
745 }
746
747 if(startcode_found){
748 s->bitstream_buffer= av_fast_realloc(
749 s->bitstream_buffer,
750 &s->allocated_bitstream_buffer_size,
751 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
752 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
753 s->bitstream_buffer_size= buf_size - current_pos;
754 }
755 }
756
757 ff_er_frame_end(s);
758
759 MPV_frame_end(s);
760
761 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
762 assert(s->current_picture.pict_type == s->pict_type);
763 if(s->pict_type==B_TYPE || s->low_delay){
764 *pict= *(AVFrame*)&s->current_picture;
765 ff_print_debug_info(s, pict);
766 } else {
767 *pict= *(AVFrame*)&s->last_picture;
768 if(pict)
769 ff_print_debug_info(s, pict);
770 }
771
772 /* Return the Picture timestamp as the frame number */
773 /* we substract 1 because it is added on utils.c */
774 avctx->frame_number = s->picture_number - 1;
775
776 /* dont output the last pic after seeking */
777 if(s->last_picture_ptr || s->low_delay)
778 *data_size = sizeof(AVFrame);
779 #ifdef PRINT_FRAME_TIME
780 printf("%Ld\n", rdtsc()-time);
781 #endif
782
783 return get_consumed_bytes(s, buf_size);
784 }
785
786 AVCodec mpeg4_decoder = {
787 "mpeg4",
788 CODEC_TYPE_VIDEO,
789 CODEC_ID_MPEG4,
790 sizeof(MpegEncContext),
791 ff_h263_decode_init,
792 NULL,
793 ff_h263_decode_end,
794 ff_h263_decode_frame,
795 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
796 .flush= ff_mpeg_flush,
797 };
798
799 AVCodec h263_decoder = {
800 "h263",
801 CODEC_TYPE_VIDEO,
802 CODEC_ID_H263,
803 sizeof(MpegEncContext),
804 ff_h263_decode_init,
805 NULL,
806 ff_h263_decode_end,
807 ff_h263_decode_frame,
808 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
809 .flush= ff_mpeg_flush,
810 };
811
812 AVCodec msmpeg4v1_decoder = {
813 "msmpeg4v1",
814 CODEC_TYPE_VIDEO,
815 CODEC_ID_MSMPEG4V1,
816 sizeof(MpegEncContext),
817 ff_h263_decode_init,
818 NULL,
819 ff_h263_decode_end,
820 ff_h263_decode_frame,
821 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
822 };
823
824 AVCodec msmpeg4v2_decoder = {
825 "msmpeg4v2",
826 CODEC_TYPE_VIDEO,
827 CODEC_ID_MSMPEG4V2,
828 sizeof(MpegEncContext),
829 ff_h263_decode_init,
830 NULL,
831 ff_h263_decode_end,
832 ff_h263_decode_frame,
833 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
834 };
835
836 AVCodec msmpeg4v3_decoder = {
837 "msmpeg4",
838 CODEC_TYPE_VIDEO,
839 CODEC_ID_MSMPEG4V3,
840 sizeof(MpegEncContext),
841 ff_h263_decode_init,
842 NULL,
843 ff_h263_decode_end,
844 ff_h263_decode_frame,
845 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
846 };
847
848 AVCodec wmv1_decoder = {
849 "wmv1",
850 CODEC_TYPE_VIDEO,
851 CODEC_ID_WMV1,
852 sizeof(MpegEncContext),
853 ff_h263_decode_init,
854 NULL,
855 ff_h263_decode_end,
856 ff_h263_decode_frame,
857 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
858 };
859
860 AVCodec h263i_decoder = {
861 "h263i",
862 CODEC_TYPE_VIDEO,
863 CODEC_ID_H263I,
864 sizeof(MpegEncContext),
865 ff_h263_decode_init,
866 NULL,
867 ff_h263_decode_end,
868 ff_h263_decode_frame,
869 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
870 };
871
872 AVCodec flv_decoder = {
873 "flv",
874 CODEC_TYPE_VIDEO,
875 CODEC_ID_FLV1,
876 sizeof(MpegEncContext),
877 ff_h263_decode_init,
878 NULL,
879 ff_h263_decode_end,
880 ff_h263_decode_frame,
881 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
882 };
883
884 AVCodecParser h263_parser = {
885 { CODEC_ID_H263 },
886 sizeof(ParseContext),
887 NULL,
888 h263_parse,
889 ff_parse_close,
890 };