approximate qpel functions: sacrifice some quality for some decoding speed. enabled...
[ffmpeg.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     av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
430     av_log(avctx, AV_LOG_DEBUG, "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((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==B_TYPE){
697         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
698         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
699     }else if((!s->no_rounding) || s->pict_type==B_TYPE){
700         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
701         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
702     }else{
703         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
704         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
705     }
706
707     if(MPV_frame_start(s, avctx) < 0)
708         return -1;
709
710 #ifdef DEBUG
711     av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
712 #endif
713
714     ff_er_frame_start(s);
715
716     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
717     //which isnt available before MPV_frame_start()
718     if (s->msmpeg4_version==5){
719         if(ff_wmv2_decode_secondary_picture_header(s) < 0)
720             return -1;
721     }
722
723     /* decode each macroblock */
724     s->mb_x=0;
725     s->mb_y=0;
726
727     decode_slice(s);
728     while(s->mb_y<s->mb_height){
729         if(s->msmpeg4_version){
730             if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
731                 break;
732         }else{
733             if(ff_h263_resync(s)<0)
734                 break;
735         }
736
737         if(s->msmpeg4_version<4 && s->h263_pred)
738             ff_mpeg4_clean_buffers(s);
739
740         decode_slice(s);
741     }
742
743     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
744         if(msmpeg4_decode_ext_header(s, buf_size) < 0){
745             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
746         }
747
748     /* divx 5.01+ bistream reorder stuff */
749     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
750         int current_pos= get_bits_count(&s->gb)>>3;
751         int startcode_found=0;
752
753         if(buf_size - current_pos > 5){
754             int i;
755             for(i=current_pos; i<buf_size-3; i++){
756                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
757                     startcode_found=1;
758                     break;
759                 }
760             }
761         }
762         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
763             startcode_found=1;
764             current_pos=0;
765         }
766
767         if(startcode_found){
768             s->bitstream_buffer= av_fast_realloc(
769                 s->bitstream_buffer,
770                 &s->allocated_bitstream_buffer_size,
771                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
772             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
773             s->bitstream_buffer_size= buf_size - current_pos;
774         }
775     }
776
777     ff_er_frame_end(s);
778
779     MPV_frame_end(s);
780
781 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
782 assert(s->current_picture.pict_type == s->pict_type);
783     if (s->pict_type == B_TYPE || s->low_delay) {
784         *pict= *(AVFrame*)s->current_picture_ptr;
785     } else if (s->last_picture_ptr != NULL) {
786         *pict= *(AVFrame*)s->last_picture_ptr;
787     }
788
789     if(s->last_picture_ptr || s->low_delay){
790         *data_size = sizeof(AVFrame);
791         ff_print_debug_info(s, pict);
792     }
793
794     /* Return the Picture timestamp as the frame number */
795     /* we substract 1 because it is added on utils.c    */
796     avctx->frame_number = s->picture_number - 1;
797
798 #ifdef PRINT_FRAME_TIME
799 av_log(avctx, AV_LOG_DEBUG, "%Ld\n", rdtsc()-time);
800 #endif
801
802     return get_consumed_bytes(s, buf_size);
803 }
804
805 AVCodec mpeg4_decoder = {
806     "mpeg4",
807     CODEC_TYPE_VIDEO,
808     CODEC_ID_MPEG4,
809     sizeof(MpegEncContext),
810     ff_h263_decode_init,
811     NULL,
812     ff_h263_decode_end,
813     ff_h263_decode_frame,
814     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
815     .flush= ff_mpeg_flush,
816 };
817
818 AVCodec h263_decoder = {
819     "h263",
820     CODEC_TYPE_VIDEO,
821     CODEC_ID_H263,
822     sizeof(MpegEncContext),
823     ff_h263_decode_init,
824     NULL,
825     ff_h263_decode_end,
826     ff_h263_decode_frame,
827     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
828     .flush= ff_mpeg_flush,
829 };
830
831 AVCodec msmpeg4v1_decoder = {
832     "msmpeg4v1",
833     CODEC_TYPE_VIDEO,
834     CODEC_ID_MSMPEG4V1,
835     sizeof(MpegEncContext),
836     ff_h263_decode_init,
837     NULL,
838     ff_h263_decode_end,
839     ff_h263_decode_frame,
840     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
841 };
842
843 AVCodec msmpeg4v2_decoder = {
844     "msmpeg4v2",
845     CODEC_TYPE_VIDEO,
846     CODEC_ID_MSMPEG4V2,
847     sizeof(MpegEncContext),
848     ff_h263_decode_init,
849     NULL,
850     ff_h263_decode_end,
851     ff_h263_decode_frame,
852     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
853 };
854
855 AVCodec msmpeg4v3_decoder = {
856     "msmpeg4",
857     CODEC_TYPE_VIDEO,
858     CODEC_ID_MSMPEG4V3,
859     sizeof(MpegEncContext),
860     ff_h263_decode_init,
861     NULL,
862     ff_h263_decode_end,
863     ff_h263_decode_frame,
864     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
865 };
866
867 AVCodec wmv1_decoder = {
868     "wmv1",
869     CODEC_TYPE_VIDEO,
870     CODEC_ID_WMV1,
871     sizeof(MpegEncContext),
872     ff_h263_decode_init,
873     NULL,
874     ff_h263_decode_end,
875     ff_h263_decode_frame,
876     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
877 };
878
879 AVCodec h263i_decoder = {
880     "h263i",
881     CODEC_TYPE_VIDEO,
882     CODEC_ID_H263I,
883     sizeof(MpegEncContext),
884     ff_h263_decode_init,
885     NULL,
886     ff_h263_decode_end,
887     ff_h263_decode_frame,
888     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
889 };
890
891 AVCodec flv_decoder = {
892     "flv",
893     CODEC_TYPE_VIDEO,
894     CODEC_ID_FLV1,
895     sizeof(MpegEncContext),
896     ff_h263_decode_init,
897     NULL,
898     ff_h263_decode_end,
899     ff_h263_decode_frame,
900     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
901 };
902
903 #ifdef CONFIG_H263_PARSER
904 AVCodecParser h263_parser = {
905     { CODEC_ID_H263 },
906     sizeof(ParseContext),
907     NULL,
908     h263_parse,
909     ff_parse_close,
910 };
911 #endif