Corrections so that builds with DEBUG work
[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 file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file h263dec.c
25  * H.263 decoder.
26  */
27
28 #include "avcodec.h"
29 #include "dsputil.h"
30 #include "mpegvideo.h"
31
32 //#define DEBUG
33 //#define PRINT_FRAME_TIME
34
35 int ff_h263_decode_init(AVCodecContext *avctx)
36 {
37     MpegEncContext *s = avctx->priv_data;
38
39     s->avctx = avctx;
40     s->out_format = FMT_H263;
41
42     s->width  = avctx->coded_width;
43     s->height = avctx->coded_height;
44     s->workaround_bugs= avctx->workaround_bugs;
45
46     // set defaults
47     MPV_decode_defaults(s);
48     s->quant_precision=5;
49     s->decode_mb= ff_h263_decode_mb;
50     s->low_delay= 1;
51     avctx->pix_fmt= PIX_FMT_YUV420P;
52     s->unrestricted_mv= 1;
53
54     /* select sub codec */
55     switch(avctx->codec->id) {
56     case CODEC_ID_H263:
57         s->unrestricted_mv= 0;
58         break;
59     case CODEC_ID_MPEG4:
60         s->decode_mb= ff_mpeg4_decode_mb;
61         s->time_increment_bits = 4; /* default value for broken headers */
62         s->h263_pred = 1;
63         s->low_delay = 0; //default, might be overriden in the vol header during header parsing
64         break;
65     case CODEC_ID_MSMPEG4V1:
66         s->h263_msmpeg4 = 1;
67         s->h263_pred = 1;
68         s->msmpeg4_version=1;
69         break;
70     case CODEC_ID_MSMPEG4V2:
71         s->h263_msmpeg4 = 1;
72         s->h263_pred = 1;
73         s->msmpeg4_version=2;
74         break;
75     case CODEC_ID_MSMPEG4V3:
76         s->h263_msmpeg4 = 1;
77         s->h263_pred = 1;
78         s->msmpeg4_version=3;
79         break;
80     case CODEC_ID_WMV1:
81         s->h263_msmpeg4 = 1;
82         s->h263_pred = 1;
83         s->msmpeg4_version=4;
84         break;
85     case CODEC_ID_WMV2:
86         s->h263_msmpeg4 = 1;
87         s->h263_pred = 1;
88         s->msmpeg4_version=5;
89         break;
90     case CODEC_ID_VC1:
91     case CODEC_ID_WMV3:
92         s->h263_msmpeg4 = 1;
93         s->h263_pred = 1;
94         s->msmpeg4_version=6;
95         break;
96     case CODEC_ID_H263I:
97         break;
98     case CODEC_ID_FLV1:
99         s->h263_flv = 1;
100         break;
101     default:
102         return -1;
103     }
104     s->codec_id= avctx->codec->id;
105
106     /* for h263, we allocate the images after having read the header */
107     if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
108         if (MPV_common_init(s) < 0)
109             return -1;
110
111     if (s->h263_msmpeg4)
112         ff_msmpeg4_decode_init(s);
113     else
114         h263_decode_init_vlc(s);
115
116     return 0;
117 }
118
119 int ff_h263_decode_end(AVCodecContext *avctx)
120 {
121     MpegEncContext *s = avctx->priv_data;
122
123     MPV_common_end(s);
124     return 0;
125 }
126
127 /**
128  * returns the number of bytes consumed for building the current frame
129  */
130 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
131     int pos= (get_bits_count(&s->gb)+7)>>3;
132
133     if(s->divx_packed){
134         //we would have to scan through the whole buf to handle the weird reordering ...
135         return buf_size;
136     }else if(s->flags&CODEC_FLAG_TRUNCATED){
137         pos -= s->parse_context.last_index;
138         if(pos<0) pos=0; // padding is not really read so this might be -1
139         return pos;
140     }else{
141         if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
142         if(pos+10>buf_size) pos=buf_size; // oops ;)
143
144         return pos;
145     }
146 }
147
148 static int decode_slice(MpegEncContext *s){
149     const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
150     const int mb_size= 16>>s->avctx->lowres;
151     s->last_resync_gb= s->gb;
152     s->first_slice_line= 1;
153
154     s->resync_mb_x= s->mb_x;
155     s->resync_mb_y= s->mb_y;
156
157     ff_set_qscale(s, s->qscale);
158
159     if(s->partitioned_frame){
160         const int qscale= s->qscale;
161
162         if(s->codec_id==CODEC_ID_MPEG4){
163             if(ff_mpeg4_decode_partitions(s) < 0)
164                 return -1;
165         }
166
167         /* restore variables which were modified */
168         s->first_slice_line=1;
169         s->mb_x= s->resync_mb_x;
170         s->mb_y= s->resync_mb_y;
171         ff_set_qscale(s, qscale);
172     }
173
174     for(; s->mb_y < s->mb_height; s->mb_y++) {
175         /* per-row end of slice checks */
176         if(s->msmpeg4_version){
177             if(s->resync_mb_y + s->slice_height == s->mb_y){
178                 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);
179
180                 return 0;
181             }
182         }
183
184         if(s->msmpeg4_version==1){
185             s->last_dc[0]=
186             s->last_dc[1]=
187             s->last_dc[2]= 128;
188         }
189
190         ff_init_block_index(s);
191         for(; s->mb_x < s->mb_width; s->mb_x++) {
192             int ret;
193
194             ff_update_block_index(s);
195
196             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
197                 s->first_slice_line=0;
198             }
199
200             /* DCT & quantize */
201
202             s->mv_dir = MV_DIR_FORWARD;
203             s->mv_type = MV_TYPE_16X16;
204 //            s->mb_skipped = 0;
205 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
206             ret= s->decode_mb(s, s->block);
207
208             if (s->pict_type!=B_TYPE)
209                 ff_h263_update_motion_val(s);
210
211             if(ret<0){
212                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
213                 if(ret==SLICE_END){
214                     MPV_decode_mb(s, s->block);
215                     if(s->loop_filter)
216                         ff_h263_loop_filter(s);
217
218 //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));
219                     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);
220
221                     s->padding_bug_score--;
222
223                     if(++s->mb_x >= s->mb_width){
224                         s->mb_x=0;
225                         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
226                         s->mb_y++;
227                     }
228                     return 0;
229                 }else if(ret==SLICE_NOEND){
230                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
231                     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);
232                     return -1;
233                 }
234                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
235                 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);
236
237                 return -1;
238             }
239
240             MPV_decode_mb(s, s->block);
241             if(s->loop_filter)
242                 ff_h263_loop_filter(s);
243         }
244
245         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
246
247         s->mb_x= 0;
248     }
249
250     assert(s->mb_x==0 && s->mb_y==s->mb_height);
251
252     /* try to detect the padding bug */
253     if(      s->codec_id==CODEC_ID_MPEG4
254        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
255        &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
256        &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
257 //       &&   !s->resync_marker
258        &&   !s->data_partitioning){
259
260         const int bits_count= get_bits_count(&s->gb);
261         const int bits_left = s->gb.size_in_bits - bits_count;
262
263         if(bits_left==0){
264             s->padding_bug_score+=16;
265         } else if(bits_left != 1){
266             int v= show_bits(&s->gb, 8);
267             v|= 0x7F >> (7-(bits_count&7));
268
269             if(v==0x7F && bits_left<=8)
270                 s->padding_bug_score--;
271             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
272                 s->padding_bug_score+= 4;
273             else
274                 s->padding_bug_score++;
275         }
276     }
277
278     if(s->workaround_bugs&FF_BUG_AUTODETECT){
279         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
280             s->workaround_bugs |=  FF_BUG_NO_PADDING;
281         else
282             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
283     }
284
285     // handle formats which don't have unique end markers
286     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
287         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
288         int max_extra=7;
289
290         /* no markers in M$ crap */
291         if(s->msmpeg4_version && s->pict_type==I_TYPE)
292             max_extra+= 17;
293
294         /* buggy padding but the frame should still end approximately at the bitstream end */
295         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
296             max_extra+= 48;
297         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
298             max_extra+= 256*256*256*64;
299
300         if(left>max_extra){
301             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
302         }
303         else if(left<0){
304             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
305         }else
306             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);
307
308         return 0;
309     }
310
311     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
312             s->gb.size_in_bits - get_bits_count(&s->gb),
313             show_bits(&s->gb, 24), s->padding_bug_score);
314
315     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);
316
317     return -1;
318 }
319
320 /**
321  * finds the end of the current frame in the bitstream.
322  * @return the position of the first byte of the next frame, or -1
323  */
324 int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
325     int vop_found, i;
326     uint32_t state;
327
328     vop_found= pc->frame_start_found;
329     state= pc->state;
330
331     i=0;
332     if(!vop_found){
333         for(i=0; i<buf_size; i++){
334             state= (state<<8) | buf[i];
335             if(state == 0x1B6){
336                 i++;
337                 vop_found=1;
338                 break;
339             }
340         }
341     }
342
343     if(vop_found){
344         /* EOF considered as end of frame */
345         if (buf_size == 0)
346             return 0;
347         for(; i<buf_size; i++){
348             state= (state<<8) | buf[i];
349             if((state&0xFFFFFF00) == 0x100){
350                 pc->frame_start_found=0;
351                 pc->state=-1;
352                 return i-3;
353             }
354         }
355     }
356     pc->frame_start_found= vop_found;
357     pc->state= state;
358     return END_NOT_FOUND;
359 }
360
361 static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
362     int vop_found, i;
363     uint32_t state;
364
365     vop_found= pc->frame_start_found;
366     state= pc->state;
367
368     i=0;
369     if(!vop_found){
370         for(i=0; i<buf_size; i++){
371             state= (state<<8) | buf[i];
372             if(state>>(32-22) == 0x20){
373                 i++;
374                 vop_found=1;
375                 break;
376             }
377         }
378     }
379
380     if(vop_found){
381       for(; i<buf_size; i++){
382         state= (state<<8) | buf[i];
383         if(state>>(32-22) == 0x20){
384             pc->frame_start_found=0;
385             pc->state=-1;
386             return i-3;
387         }
388       }
389     }
390     pc->frame_start_found= vop_found;
391     pc->state= state;
392
393     return END_NOT_FOUND;
394 }
395
396 #ifdef CONFIG_H263_PARSER
397 static int h263_parse(AVCodecParserContext *s,
398                            AVCodecContext *avctx,
399                            uint8_t **poutbuf, int *poutbuf_size,
400                            const uint8_t *buf, int buf_size)
401 {
402     ParseContext *pc = s->priv_data;
403     int next;
404
405     next= h263_find_frame_end(pc, buf, buf_size);
406
407     if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
408         *poutbuf = NULL;
409         *poutbuf_size = 0;
410         return buf_size;
411     }
412
413     *poutbuf = (uint8_t *)buf;
414     *poutbuf_size = buf_size;
415     return next;
416 }
417 #endif
418
419 int ff_h263_decode_frame(AVCodecContext *avctx,
420                              void *data, int *data_size,
421                              uint8_t *buf, int buf_size)
422 {
423     MpegEncContext *s = avctx->priv_data;
424     int ret;
425     AVFrame *pict = data;
426
427 #ifdef PRINT_FRAME_TIME
428 uint64_t time= rdtsc();
429 #endif
430 #ifdef DEBUG
431     av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
432     if(buf_size>0)
433         av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
434 #endif
435     s->flags= avctx->flags;
436     s->flags2= avctx->flags2;
437
438     /* no supplementary picture */
439     if (buf_size == 0) {
440         /* special case for last picture */
441         if (s->low_delay==0 && s->next_picture_ptr) {
442             *pict= *(AVFrame*)s->next_picture_ptr;
443             s->next_picture_ptr= NULL;
444
445             *data_size = sizeof(AVFrame);
446         }
447
448         return 0;
449     }
450
451     if(s->flags&CODEC_FLAG_TRUNCATED){
452         int next;
453
454         if(s->codec_id==CODEC_ID_MPEG4){
455             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
456         }else if(s->codec_id==CODEC_ID_H263){
457             next= h263_find_frame_end(&s->parse_context, buf, buf_size);
458         }else{
459             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
460             return -1;
461         }
462
463         if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
464             return buf_size;
465     }
466
467
468 retry:
469
470     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
471         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
472     }else
473         init_get_bits(&s->gb, buf, buf_size*8);
474     s->bitstream_buffer_size=0;
475
476     if (!s->context_initialized) {
477         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
478             return -1;
479     }
480
481     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
482     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
483         int i= ff_find_unused_picture(s, 0);
484         s->current_picture_ptr= &s->picture[i];
485     }
486
487     /* let's go :-) */
488     if (s->msmpeg4_version==5) {
489         ret= ff_wmv2_decode_picture_header(s);
490     } else if (s->msmpeg4_version) {
491         ret = msmpeg4_decode_picture_header(s);
492     } else if (s->h263_pred) {
493         if(s->avctx->extradata_size && s->picture_number==0){
494             GetBitContext gb;
495
496             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
497             ret = ff_mpeg4_decode_picture_header(s, &gb);
498         }
499         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
500
501         if(s->flags& CODEC_FLAG_LOW_DELAY)
502             s->low_delay=1;
503     } else if (s->codec_id == CODEC_ID_H263I) {
504         ret = intel_h263_decode_picture_header(s);
505     } else if (s->h263_flv) {
506         ret = flv_h263_decode_picture_header(s);
507     } else {
508         ret = h263_decode_picture_header(s);
509     }
510
511     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
512
513     /* skip if the header was thrashed */
514     if (ret < 0){
515         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
516         return -1;
517     }
518
519     avctx->has_b_frames= !s->low_delay;
520
521     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
522         if(s->stream_codec_tag == ff_get_fourcc("XVID") ||
523            s->codec_tag == ff_get_fourcc("XVID") || s->codec_tag == ff_get_fourcc("XVIX") ||
524            s->codec_tag == ff_get_fourcc("RMP4"))
525             s->xvid_build= -1;
526 #if 0
527         if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
528            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
529             s->xvid_build= -1;
530 #endif
531     }
532
533     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
534         if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
535             s->divx_version= 400; //divx 4
536     }
537
538     if(s->xvid_build && s->divx_version){
539         s->divx_version=
540         s->divx_build= 0;
541     }
542
543     if(s->workaround_bugs&FF_BUG_AUTODETECT){
544         if(s->codec_tag == ff_get_fourcc("XVIX"))
545             s->workaround_bugs|= FF_BUG_XVID_ILACE;
546
547         if(s->codec_tag == ff_get_fourcc("UMP4")){
548             s->workaround_bugs|= FF_BUG_UMP4;
549         }
550
551         if(s->divx_version>=500){
552             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
553         }
554
555         if(s->divx_version>502){
556             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
557         }
558
559         if(s->xvid_build && s->xvid_build<=3)
560             s->padding_bug_score= 256*256*256*64;
561
562         if(s->xvid_build && s->xvid_build<=1)
563             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
564
565         if(s->xvid_build && s->xvid_build<=12)
566             s->workaround_bugs|= FF_BUG_EDGE;
567
568         if(s->xvid_build && s->xvid_build<=32)
569             s->workaround_bugs|= FF_BUG_DC_CLIP;
570
571 #define SET_QPEL_FUNC(postfix1, postfix2) \
572     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
573     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
574     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
575
576         if(s->lavc_build && s->lavc_build<4653)
577             s->workaround_bugs|= FF_BUG_STD_QPEL;
578
579         if(s->lavc_build && s->lavc_build<4655)
580             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
581
582         if(s->lavc_build && s->lavc_build<4670){
583             s->workaround_bugs|= FF_BUG_EDGE;
584         }
585
586         if(s->lavc_build && s->lavc_build<=4712)
587             s->workaround_bugs|= FF_BUG_DC_CLIP;
588
589         if(s->divx_version)
590             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
591 //printf("padding_bug_score: %d\n", s->padding_bug_score);
592         if(s->divx_version==501 && s->divx_build==20020416)
593             s->padding_bug_score= 256*256*256*64;
594
595         if(s->divx_version && s->divx_version<500){
596             s->workaround_bugs|= FF_BUG_EDGE;
597         }
598
599         if(s->divx_version)
600             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
601 #if 0
602         if(s->divx_version==500)
603             s->padding_bug_score= 256*256*256*64;
604
605         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
606          * lets hope this at least works
607          */
608         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
609            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
610             s->workaround_bugs|= FF_BUG_NO_PADDING;
611
612         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
613             s->workaround_bugs|= FF_BUG_NO_PADDING;
614 #endif
615     }
616
617     if(s->workaround_bugs& FF_BUG_STD_QPEL){
618         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
619         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
620         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
621         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
622         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
623         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
624
625         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
626         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
627         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
628         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
629         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
630         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
631     }
632
633     if(avctx->debug & FF_DEBUG_BUGS)
634         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
635                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
636                s->divx_packed ? "p" : "");
637
638 #if 0 // dump bits per frame / qp / complexity
639 {
640     static FILE *f=NULL;
641     if(!f) f=fopen("rate_qp_cplx.txt", "w");
642     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
643 }
644 #endif
645
646 #if defined(HAVE_MMX) && defined(CONFIG_GPL)
647     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX)){
648         avctx->idct_algo= FF_IDCT_XVIDMMX;
649         avctx->coded_width= 0; // force reinit
650 //        dsputil_init(&s->dsp, avctx);
651         s->picture_number=0;
652     }
653 #endif
654
655         /* After H263 & mpeg4 header decode we have the height, width,*/
656         /* and other parameters. So then we could init the picture   */
657         /* FIXME: By the way H263 decoder is evolving it should have */
658         /* an H263EncContext                                         */
659
660     if (   s->width  != avctx->coded_width
661         || s->height != avctx->coded_height) {
662         /* H.263 could change picture size any time */
663         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
664         s->parse_context.buffer=0;
665         MPV_common_end(s);
666         s->parse_context= pc;
667     }
668     if (!s->context_initialized) {
669         avcodec_set_dimensions(avctx, s->width, s->height);
670
671         goto retry;
672     }
673
674     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
675         s->gob_index = ff_h263_get_gob_height(s);
676
677     // for hurry_up==5
678     s->current_picture.pict_type= s->pict_type;
679     s->current_picture.key_frame= s->pict_type == I_TYPE;
680
681     /* skip B-frames if we don't have reference frames */
682     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
683     /* skip b frames if we are in a hurry */
684     if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
685     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
686        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
687        ||  avctx->skip_frame >= AVDISCARD_ALL)
688         return get_consumed_bytes(s, buf_size);
689     /* skip everything if we are in a hurry>=5 */
690     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
691
692     if(s->next_p_frame_damaged){
693         if(s->pict_type==B_TYPE)
694             return get_consumed_bytes(s, buf_size);
695         else
696             s->next_p_frame_damaged=0;
697     }
698
699     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==B_TYPE){
700         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
701         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
702     }else if((!s->no_rounding) || s->pict_type==B_TYPE){
703         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
704         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
705     }else{
706         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
707         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
708     }
709
710     if(MPV_frame_start(s, avctx) < 0)
711         return -1;
712
713 #ifdef DEBUG
714     av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
715 #endif
716
717     ff_er_frame_start(s);
718
719     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
720     //which isnt available before MPV_frame_start()
721     if (s->msmpeg4_version==5){
722         if(ff_wmv2_decode_secondary_picture_header(s) < 0)
723             return -1;
724     }
725
726     /* decode each macroblock */
727     s->mb_x=0;
728     s->mb_y=0;
729
730     decode_slice(s);
731     while(s->mb_y<s->mb_height){
732         if(s->msmpeg4_version){
733             if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
734                 break;
735         }else{
736             if(ff_h263_resync(s)<0)
737                 break;
738         }
739
740         if(s->msmpeg4_version<4 && s->h263_pred)
741             ff_mpeg4_clean_buffers(s);
742
743         decode_slice(s);
744     }
745
746     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
747         if(msmpeg4_decode_ext_header(s, buf_size) < 0){
748             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
749         }
750
751     /* divx 5.01+ bistream reorder stuff */
752     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
753         int current_pos= get_bits_count(&s->gb)>>3;
754         int startcode_found=0;
755
756         if(buf_size - current_pos > 5){
757             int i;
758             for(i=current_pos; i<buf_size-3; i++){
759                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
760                     startcode_found=1;
761                     break;
762                 }
763             }
764         }
765         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
766             startcode_found=1;
767             current_pos=0;
768         }
769
770         if(startcode_found){
771             s->bitstream_buffer= av_fast_realloc(
772                 s->bitstream_buffer,
773                 &s->allocated_bitstream_buffer_size,
774                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
775             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
776             s->bitstream_buffer_size= buf_size - current_pos;
777         }
778     }
779
780     ff_er_frame_end(s);
781
782     MPV_frame_end(s);
783
784 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
785 assert(s->current_picture.pict_type == s->pict_type);
786     if (s->pict_type == B_TYPE || s->low_delay) {
787         *pict= *(AVFrame*)s->current_picture_ptr;
788     } else if (s->last_picture_ptr != NULL) {
789         *pict= *(AVFrame*)s->last_picture_ptr;
790     }
791
792     if(s->last_picture_ptr || s->low_delay){
793         *data_size = sizeof(AVFrame);
794         ff_print_debug_info(s, pict);
795     }
796
797     /* Return the Picture timestamp as the frame number */
798     /* we substract 1 because it is added on utils.c    */
799     avctx->frame_number = s->picture_number - 1;
800
801 #ifdef PRINT_FRAME_TIME
802 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
803 #endif
804
805     return get_consumed_bytes(s, buf_size);
806 }
807
808 AVCodec mpeg4_decoder = {
809     "mpeg4",
810     CODEC_TYPE_VIDEO,
811     CODEC_ID_MPEG4,
812     sizeof(MpegEncContext),
813     ff_h263_decode_init,
814     NULL,
815     ff_h263_decode_end,
816     ff_h263_decode_frame,
817     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
818     .flush= ff_mpeg_flush,
819 };
820
821 AVCodec h263_decoder = {
822     "h263",
823     CODEC_TYPE_VIDEO,
824     CODEC_ID_H263,
825     sizeof(MpegEncContext),
826     ff_h263_decode_init,
827     NULL,
828     ff_h263_decode_end,
829     ff_h263_decode_frame,
830     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
831     .flush= ff_mpeg_flush,
832 };
833
834 AVCodec msmpeg4v1_decoder = {
835     "msmpeg4v1",
836     CODEC_TYPE_VIDEO,
837     CODEC_ID_MSMPEG4V1,
838     sizeof(MpegEncContext),
839     ff_h263_decode_init,
840     NULL,
841     ff_h263_decode_end,
842     ff_h263_decode_frame,
843     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
844 };
845
846 AVCodec msmpeg4v2_decoder = {
847     "msmpeg4v2",
848     CODEC_TYPE_VIDEO,
849     CODEC_ID_MSMPEG4V2,
850     sizeof(MpegEncContext),
851     ff_h263_decode_init,
852     NULL,
853     ff_h263_decode_end,
854     ff_h263_decode_frame,
855     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
856 };
857
858 AVCodec msmpeg4v3_decoder = {
859     "msmpeg4",
860     CODEC_TYPE_VIDEO,
861     CODEC_ID_MSMPEG4V3,
862     sizeof(MpegEncContext),
863     ff_h263_decode_init,
864     NULL,
865     ff_h263_decode_end,
866     ff_h263_decode_frame,
867     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
868 };
869
870 AVCodec wmv1_decoder = {
871     "wmv1",
872     CODEC_TYPE_VIDEO,
873     CODEC_ID_WMV1,
874     sizeof(MpegEncContext),
875     ff_h263_decode_init,
876     NULL,
877     ff_h263_decode_end,
878     ff_h263_decode_frame,
879     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
880 };
881
882 AVCodec h263i_decoder = {
883     "h263i",
884     CODEC_TYPE_VIDEO,
885     CODEC_ID_H263I,
886     sizeof(MpegEncContext),
887     ff_h263_decode_init,
888     NULL,
889     ff_h263_decode_end,
890     ff_h263_decode_frame,
891     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
892 };
893
894 AVCodec flv_decoder = {
895     "flv",
896     CODEC_TYPE_VIDEO,
897     CODEC_ID_FLV1,
898     sizeof(MpegEncContext),
899     ff_h263_decode_init,
900     NULL,
901     ff_h263_decode_end,
902     ff_h263_decode_frame,
903     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
904 };
905
906 #ifdef CONFIG_H263_PARSER
907 AVCodecParser h263_parser = {
908     { CODEC_ID_H263 },
909     sizeof(ParseContext),
910     NULL,
911     h263_parse,
912     ff_parse_close,
913 };
914 #endif