Change license headers to say 'FFmpeg' instead of 'this program/this library'
[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     av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
433 #endif
434     s->flags= avctx->flags;
435     s->flags2= avctx->flags2;
436
437     /* no supplementary picture */
438     if (buf_size == 0) {
439         /* special case for last picture */
440         if (s->low_delay==0 && s->next_picture_ptr) {
441             *pict= *(AVFrame*)s->next_picture_ptr;
442             s->next_picture_ptr= NULL;
443
444             *data_size = sizeof(AVFrame);
445         }
446
447         return 0;
448     }
449
450     if(s->flags&CODEC_FLAG_TRUNCATED){
451         int next;
452
453         if(s->codec_id==CODEC_ID_MPEG4){
454             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
455         }else if(s->codec_id==CODEC_ID_H263){
456             next= h263_find_frame_end(&s->parse_context, buf, buf_size);
457         }else{
458             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
459             return -1;
460         }
461
462         if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
463             return buf_size;
464     }
465
466
467 retry:
468
469     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
470         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
471     }else
472         init_get_bits(&s->gb, buf, buf_size*8);
473     s->bitstream_buffer_size=0;
474
475     if (!s->context_initialized) {
476         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
477             return -1;
478     }
479
480     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
481     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
482         int i= ff_find_unused_picture(s, 0);
483         s->current_picture_ptr= &s->picture[i];
484     }
485
486     /* let's go :-) */
487     if (s->msmpeg4_version==5) {
488         ret= ff_wmv2_decode_picture_header(s);
489     } else if (s->msmpeg4_version) {
490         ret = msmpeg4_decode_picture_header(s);
491     } else if (s->h263_pred) {
492         if(s->avctx->extradata_size && s->picture_number==0){
493             GetBitContext gb;
494
495             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
496             ret = ff_mpeg4_decode_picture_header(s, &gb);
497         }
498         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
499
500         if(s->flags& CODEC_FLAG_LOW_DELAY)
501             s->low_delay=1;
502     } else if (s->codec_id == CODEC_ID_H263I) {
503         ret = intel_h263_decode_picture_header(s);
504     } else if (s->h263_flv) {
505         ret = flv_h263_decode_picture_header(s);
506     } else {
507         ret = h263_decode_picture_header(s);
508     }
509
510     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
511
512     /* skip if the header was thrashed */
513     if (ret < 0){
514         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
515         return -1;
516     }
517
518     avctx->has_b_frames= !s->low_delay;
519
520     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
521         if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
522            s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX") ||
523            s->avctx->codec_tag == ff_get_fourcc("RMP4"))
524             s->xvid_build= -1;
525 #if 0
526         if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
527            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
528             s->xvid_build= -1;
529 #endif
530     }
531
532     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
533         if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
534             s->divx_version= 400; //divx 4
535     }
536
537     if(s->xvid_build && s->divx_version){
538         s->divx_version=
539         s->divx_build= 0;
540     }
541
542     if(s->workaround_bugs&FF_BUG_AUTODETECT){
543         if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
544             s->workaround_bugs|= FF_BUG_XVID_ILACE;
545
546         if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
547             s->workaround_bugs|= FF_BUG_UMP4;
548         }
549
550         if(s->divx_version>=500){
551             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
552         }
553
554         if(s->divx_version>502){
555             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
556         }
557
558         if(s->xvid_build && s->xvid_build<=3)
559             s->padding_bug_score= 256*256*256*64;
560
561         if(s->xvid_build && s->xvid_build<=1)
562             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
563
564         if(s->xvid_build && s->xvid_build<=12)
565             s->workaround_bugs|= FF_BUG_EDGE;
566
567         if(s->xvid_build && s->xvid_build<=32)
568             s->workaround_bugs|= FF_BUG_DC_CLIP;
569
570 #define SET_QPEL_FUNC(postfix1, postfix2) \
571     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
572     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
573     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
574
575         if(s->lavc_build && s->lavc_build<4653)
576             s->workaround_bugs|= FF_BUG_STD_QPEL;
577
578         if(s->lavc_build && s->lavc_build<4655)
579             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
580
581         if(s->lavc_build && s->lavc_build<4670){
582             s->workaround_bugs|= FF_BUG_EDGE;
583         }
584
585         if(s->lavc_build && s->lavc_build<=4712)
586             s->workaround_bugs|= FF_BUG_DC_CLIP;
587
588         if(s->divx_version)
589             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
590 //printf("padding_bug_score: %d\n", s->padding_bug_score);
591         if(s->divx_version==501 && s->divx_build==20020416)
592             s->padding_bug_score= 256*256*256*64;
593
594         if(s->divx_version && s->divx_version<500){
595             s->workaround_bugs|= FF_BUG_EDGE;
596         }
597
598         if(s->divx_version)
599             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
600 #if 0
601         if(s->divx_version==500)
602             s->padding_bug_score= 256*256*256*64;
603
604         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
605          * lets hope this at least works
606          */
607         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
608            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
609             s->workaround_bugs|= FF_BUG_NO_PADDING;
610
611         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
612             s->workaround_bugs|= FF_BUG_NO_PADDING;
613 #endif
614     }
615
616     if(s->workaround_bugs& FF_BUG_STD_QPEL){
617         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
618         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
619         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
620         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
621         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
622         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
623
624         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
625         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
626         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
627         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
628         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
629         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
630     }
631
632     if(avctx->debug & FF_DEBUG_BUGS)
633         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
634                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
635                s->divx_packed ? "p" : "");
636
637 #if 0 // dump bits per frame / qp / complexity
638 {
639     static FILE *f=NULL;
640     if(!f) f=fopen("rate_qp_cplx.txt", "w");
641     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
642 }
643 #endif
644
645 #if defined(HAVE_MMX) && defined(CONFIG_GPL)
646     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX)){
647         avctx->idct_algo= FF_IDCT_XVIDMMX;
648         avctx->coded_width= 0; // force reinit
649 //        dsputil_init(&s->dsp, avctx);
650         s->picture_number=0;
651     }
652 #endif
653
654         /* After H263 & mpeg4 header decode we have the height, width,*/
655         /* and other parameters. So then we could init the picture   */
656         /* FIXME: By the way H263 decoder is evolving it should have */
657         /* an H263EncContext                                         */
658
659     if (   s->width  != avctx->coded_width
660         || s->height != avctx->coded_height) {
661         /* H.263 could change picture size any time */
662         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
663         s->parse_context.buffer=0;
664         MPV_common_end(s);
665         s->parse_context= pc;
666     }
667     if (!s->context_initialized) {
668         avcodec_set_dimensions(avctx, s->width, s->height);
669
670         goto retry;
671     }
672
673     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
674         s->gob_index = ff_h263_get_gob_height(s);
675
676     // for hurry_up==5
677     s->current_picture.pict_type= s->pict_type;
678     s->current_picture.key_frame= s->pict_type == I_TYPE;
679
680     /* skip B-frames if we don't have reference frames */
681     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
682     /* skip b frames if we are in a hurry */
683     if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
684     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
685        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
686        ||  avctx->skip_frame >= AVDISCARD_ALL)
687         return get_consumed_bytes(s, buf_size);
688     /* skip everything if we are in a hurry>=5 */
689     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
690
691     if(s->next_p_frame_damaged){
692         if(s->pict_type==B_TYPE)
693             return get_consumed_bytes(s, buf_size);
694         else
695             s->next_p_frame_damaged=0;
696     }
697
698     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==B_TYPE){
699         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
700         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
701     }else if((!s->no_rounding) || s->pict_type==B_TYPE){
702         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
703         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
704     }else{
705         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
706         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
707     }
708
709     if(MPV_frame_start(s, avctx) < 0)
710         return -1;
711
712 #ifdef DEBUG
713     av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
714 #endif
715
716     ff_er_frame_start(s);
717
718     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
719     //which isnt available before MPV_frame_start()
720     if (s->msmpeg4_version==5){
721         if(ff_wmv2_decode_secondary_picture_header(s) < 0)
722             return -1;
723     }
724
725     /* decode each macroblock */
726     s->mb_x=0;
727     s->mb_y=0;
728
729     decode_slice(s);
730     while(s->mb_y<s->mb_height){
731         if(s->msmpeg4_version){
732             if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
733                 break;
734         }else{
735             if(ff_h263_resync(s)<0)
736                 break;
737         }
738
739         if(s->msmpeg4_version<4 && s->h263_pred)
740             ff_mpeg4_clean_buffers(s);
741
742         decode_slice(s);
743     }
744
745     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
746         if(msmpeg4_decode_ext_header(s, buf_size) < 0){
747             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
748         }
749
750     /* divx 5.01+ bistream reorder stuff */
751     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
752         int current_pos= get_bits_count(&s->gb)>>3;
753         int startcode_found=0;
754
755         if(buf_size - current_pos > 5){
756             int i;
757             for(i=current_pos; i<buf_size-3; i++){
758                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
759                     startcode_found=1;
760                     break;
761                 }
762             }
763         }
764         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
765             startcode_found=1;
766             current_pos=0;
767         }
768
769         if(startcode_found){
770             s->bitstream_buffer= av_fast_realloc(
771                 s->bitstream_buffer,
772                 &s->allocated_bitstream_buffer_size,
773                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
774             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
775             s->bitstream_buffer_size= buf_size - current_pos;
776         }
777     }
778
779     ff_er_frame_end(s);
780
781     MPV_frame_end(s);
782
783 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
784 assert(s->current_picture.pict_type == s->pict_type);
785     if (s->pict_type == B_TYPE || s->low_delay) {
786         *pict= *(AVFrame*)s->current_picture_ptr;
787     } else if (s->last_picture_ptr != NULL) {
788         *pict= *(AVFrame*)s->last_picture_ptr;
789     }
790
791     if(s->last_picture_ptr || s->low_delay){
792         *data_size = sizeof(AVFrame);
793         ff_print_debug_info(s, pict);
794     }
795
796     /* Return the Picture timestamp as the frame number */
797     /* we substract 1 because it is added on utils.c    */
798     avctx->frame_number = s->picture_number - 1;
799
800 #ifdef PRINT_FRAME_TIME
801 av_log(avctx, AV_LOG_DEBUG, "%Ld\n", rdtsc()-time);
802 #endif
803
804     return get_consumed_bytes(s, buf_size);
805 }
806
807 AVCodec mpeg4_decoder = {
808     "mpeg4",
809     CODEC_TYPE_VIDEO,
810     CODEC_ID_MPEG4,
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 h263_decoder = {
821     "h263",
822     CODEC_TYPE_VIDEO,
823     CODEC_ID_H263,
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 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
830     .flush= ff_mpeg_flush,
831 };
832
833 AVCodec msmpeg4v1_decoder = {
834     "msmpeg4v1",
835     CODEC_TYPE_VIDEO,
836     CODEC_ID_MSMPEG4V1,
837     sizeof(MpegEncContext),
838     ff_h263_decode_init,
839     NULL,
840     ff_h263_decode_end,
841     ff_h263_decode_frame,
842     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
843 };
844
845 AVCodec msmpeg4v2_decoder = {
846     "msmpeg4v2",
847     CODEC_TYPE_VIDEO,
848     CODEC_ID_MSMPEG4V2,
849     sizeof(MpegEncContext),
850     ff_h263_decode_init,
851     NULL,
852     ff_h263_decode_end,
853     ff_h263_decode_frame,
854     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
855 };
856
857 AVCodec msmpeg4v3_decoder = {
858     "msmpeg4",
859     CODEC_TYPE_VIDEO,
860     CODEC_ID_MSMPEG4V3,
861     sizeof(MpegEncContext),
862     ff_h263_decode_init,
863     NULL,
864     ff_h263_decode_end,
865     ff_h263_decode_frame,
866     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
867 };
868
869 AVCodec wmv1_decoder = {
870     "wmv1",
871     CODEC_TYPE_VIDEO,
872     CODEC_ID_WMV1,
873     sizeof(MpegEncContext),
874     ff_h263_decode_init,
875     NULL,
876     ff_h263_decode_end,
877     ff_h263_decode_frame,
878     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
879 };
880
881 AVCodec h263i_decoder = {
882     "h263i",
883     CODEC_TYPE_VIDEO,
884     CODEC_ID_H263I,
885     sizeof(MpegEncContext),
886     ff_h263_decode_init,
887     NULL,
888     ff_h263_decode_end,
889     ff_h263_decode_frame,
890     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
891 };
892
893 AVCodec flv_decoder = {
894     "flv",
895     CODEC_TYPE_VIDEO,
896     CODEC_ID_FLV1,
897     sizeof(MpegEncContext),
898     ff_h263_decode_init,
899     NULL,
900     ff_h263_decode_end,
901     ff_h263_decode_frame,
902     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
903 };
904
905 #ifdef CONFIG_H263_PARSER
906 AVCodecParser h263_parser = {
907     { CODEC_ID_H263 },
908     sizeof(ParseContext),
909     NULL,
910     h263_parse,
911     ff_parse_close,
912 };
913 #endif