Merge commit '36ef5369ee9b336febc2c270f8718cec4476cb85'
[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
25  * H.263 decoder.
26  */
27
28 #define UNCHECKED_BITSTREAM_READER 1
29
30 #include "libavutil/cpu.h"
31 #include "internal.h"
32 #include "avcodec.h"
33 #include "dsputil.h"
34 #include "mpegvideo.h"
35 #include "h263.h"
36 #include "h263_parser.h"
37 #include "mpeg4video_parser.h"
38 #include "msmpeg4.h"
39 #include "vdpau_internal.h"
40 #include "thread.h"
41 #include "flv.h"
42 #include "mpeg4video.h"
43
44 //#define DEBUG
45 //#define PRINT_FRAME_TIME
46
47 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
48 {
49     MpegEncContext *s = avctx->priv_data;
50
51     s->avctx = avctx;
52     s->out_format = FMT_H263;
53
54     s->width  = avctx->coded_width;
55     s->height = avctx->coded_height;
56     s->workaround_bugs= avctx->workaround_bugs;
57
58     // set defaults
59     ff_MPV_decode_defaults(s);
60     s->quant_precision=5;
61     s->decode_mb= ff_h263_decode_mb;
62     s->low_delay= 1;
63     avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
64     s->unrestricted_mv= 1;
65
66     /* select sub codec */
67     switch(avctx->codec->id) {
68     case AV_CODEC_ID_H263:
69     case AV_CODEC_ID_H263P:
70         s->unrestricted_mv= 0;
71         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
72         break;
73     case AV_CODEC_ID_MPEG4:
74         break;
75     case AV_CODEC_ID_MSMPEG4V1:
76         s->h263_pred = 1;
77         s->msmpeg4_version=1;
78         break;
79     case AV_CODEC_ID_MSMPEG4V2:
80         s->h263_pred = 1;
81         s->msmpeg4_version=2;
82         break;
83     case AV_CODEC_ID_MSMPEG4V3:
84         s->h263_pred = 1;
85         s->msmpeg4_version=3;
86         break;
87     case AV_CODEC_ID_WMV1:
88         s->h263_pred = 1;
89         s->msmpeg4_version=4;
90         break;
91     case AV_CODEC_ID_WMV2:
92         s->h263_pred = 1;
93         s->msmpeg4_version=5;
94         break;
95     case AV_CODEC_ID_VC1:
96     case AV_CODEC_ID_WMV3:
97     case AV_CODEC_ID_VC1IMAGE:
98     case AV_CODEC_ID_WMV3IMAGE:
99         s->h263_pred = 1;
100         s->msmpeg4_version=6;
101         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
102         break;
103     case AV_CODEC_ID_H263I:
104         break;
105     case AV_CODEC_ID_FLV1:
106         s->h263_flv = 1;
107         break;
108     default:
109         return -1;
110     }
111     s->codec_id= avctx->codec->id;
112     avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
113
114     /* for h263, we allocate the images after having read the header */
115     if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
116         if (ff_MPV_common_init(s) < 0)
117             return -1;
118
119         ff_h263_decode_init_vlc(s);
120
121     return 0;
122 }
123
124 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
125 {
126     MpegEncContext *s = avctx->priv_data;
127
128     ff_MPV_common_end(s);
129     return 0;
130 }
131
132 /**
133  * Return the number of bytes consumed for building the current frame.
134  */
135 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
136     int pos= (get_bits_count(&s->gb)+7)>>3;
137
138     if(s->divx_packed || s->avctx->hwaccel){
139         //we would have to scan through the whole buf to handle the weird reordering ...
140         return buf_size;
141     }else if(s->flags&CODEC_FLAG_TRUNCATED){
142         pos -= s->parse_context.last_index;
143         if(pos<0) pos=0; // padding is not really read so this might be -1
144         return pos;
145     }else{
146         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
147         if(pos+10>buf_size) pos=buf_size; // oops ;)
148
149         return pos;
150     }
151 }
152
153 static int decode_slice(MpegEncContext *s){
154     const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
155     const int mb_size= 16>>s->avctx->lowres;
156     s->last_resync_gb= s->gb;
157     s->first_slice_line= 1;
158
159     s->resync_mb_x= s->mb_x;
160     s->resync_mb_y= s->mb_y;
161
162     ff_set_qscale(s, s->qscale);
163
164     if (s->avctx->hwaccel) {
165         const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
166         const uint8_t *end  = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
167         skip_bits_long(&s->gb, 8*(end - start));
168         return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
169     }
170
171     if(s->partitioned_frame){
172         const int qscale= s->qscale;
173
174         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
175             if(ff_mpeg4_decode_partitions(s) < 0)
176                 return -1;
177         }
178
179         /* restore variables which were modified */
180         s->first_slice_line=1;
181         s->mb_x= s->resync_mb_x;
182         s->mb_y= s->resync_mb_y;
183         ff_set_qscale(s, qscale);
184     }
185
186     for(; s->mb_y < s->mb_height; s->mb_y++) {
187         /* per-row end of slice checks */
188         if(s->msmpeg4_version){
189             if(s->resync_mb_y + s->slice_height == s->mb_y){
190                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
191
192                 return 0;
193             }
194         }
195
196         if(s->msmpeg4_version==1){
197             s->last_dc[0]=
198             s->last_dc[1]=
199             s->last_dc[2]= 128;
200         }
201
202         ff_init_block_index(s);
203         for(; s->mb_x < s->mb_width; s->mb_x++) {
204             int ret;
205
206             ff_update_block_index(s);
207
208             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
209                 s->first_slice_line=0;
210             }
211
212             /* DCT & quantize */
213
214             s->mv_dir = MV_DIR_FORWARD;
215             s->mv_type = MV_TYPE_16X16;
216 //            s->mb_skipped = 0;
217 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
218             ret= s->decode_mb(s, s->block);
219
220             if (s->pict_type!=AV_PICTURE_TYPE_B)
221                 ff_h263_update_motion_val(s);
222
223             if(ret<0){
224                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
225                 if(ret==SLICE_END){
226                     ff_MPV_decode_mb(s, s->block);
227                     if(s->loop_filter)
228                         ff_h263_loop_filter(s);
229
230 //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));
231                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
232
233                     s->padding_bug_score--;
234
235                     if(++s->mb_x >= s->mb_width){
236                         s->mb_x=0;
237                         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
238                         ff_MPV_report_decode_progress(s);
239                         s->mb_y++;
240                     }
241                     return 0;
242                 }else if(ret==SLICE_NOEND){
243                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
244                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
245                     return -1;
246                 }
247                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
248                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
249
250                 return -1;
251             }
252
253             ff_MPV_decode_mb(s, s->block);
254             if(s->loop_filter)
255                 ff_h263_loop_filter(s);
256         }
257
258         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
259         ff_MPV_report_decode_progress(s);
260
261         s->mb_x= 0;
262     }
263
264     assert(s->mb_x==0 && s->mb_y==s->mb_height);
265
266     if(s->codec_id==AV_CODEC_ID_MPEG4
267        && (s->workaround_bugs&FF_BUG_AUTODETECT)
268        && get_bits_left(&s->gb) >= 48
269        && show_bits(&s->gb, 24)==0x4010
270        && !s->data_partitioning)
271         s->padding_bug_score+=32;
272
273     /* try to detect the padding bug */
274     if(      s->codec_id==AV_CODEC_ID_MPEG4
275        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
276        &&    get_bits_left(&s->gb) >=0
277        &&    get_bits_left(&s->gb) < 137
278 //       &&   !s->resync_marker
279        &&   !s->data_partitioning){
280
281         const int bits_count= get_bits_count(&s->gb);
282         const int bits_left = s->gb.size_in_bits - bits_count;
283
284         if(bits_left==0){
285             s->padding_bug_score+=16;
286         } else if(bits_left != 1){
287             int v= show_bits(&s->gb, 8);
288             v|= 0x7F >> (7-(bits_count&7));
289
290             if(v==0x7F && bits_left<=8)
291                 s->padding_bug_score--;
292             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
293                 s->padding_bug_score+= 4;
294             else
295                 s->padding_bug_score++;
296         }
297     }
298
299     if(s->workaround_bugs&FF_BUG_AUTODETECT){
300         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
301             s->workaround_bugs |=  FF_BUG_NO_PADDING;
302         else
303             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
304     }
305
306     // handle formats which don't have unique end markers
307     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
308         int left= get_bits_left(&s->gb);
309         int max_extra=7;
310
311         /* no markers in M$ crap */
312         if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
313             max_extra+= 17;
314
315         /* buggy padding but the frame should still end approximately at the bitstream end */
316         if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
317             max_extra+= 48;
318         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
319             max_extra+= 256*256*256*64;
320
321         if(left>max_extra){
322             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
323         }
324         else if(left<0){
325             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
326         }else
327             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
328
329         return 0;
330     }
331
332     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
333             get_bits_left(&s->gb),
334             show_bits(&s->gb, 24), s->padding_bug_score);
335
336     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
337
338     return -1;
339 }
340
341 int ff_h263_decode_frame(AVCodecContext *avctx,
342                              void *data, int *data_size,
343                              AVPacket *avpkt)
344 {
345     const uint8_t *buf = avpkt->data;
346     int buf_size = avpkt->size;
347     MpegEncContext *s = avctx->priv_data;
348     int ret;
349     AVFrame *pict = data;
350
351 #ifdef PRINT_FRAME_TIME
352 uint64_t time= rdtsc();
353 #endif
354     s->flags= avctx->flags;
355     s->flags2= avctx->flags2;
356
357     /* no supplementary picture */
358     if (buf_size == 0) {
359         /* special case for last picture */
360         if (s->low_delay==0 && s->next_picture_ptr) {
361             *pict = s->next_picture_ptr->f;
362             s->next_picture_ptr= NULL;
363
364             *data_size = sizeof(AVFrame);
365         }
366
367         return 0;
368     }
369
370     if(s->flags&CODEC_FLAG_TRUNCATED){
371         int next;
372
373         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
374             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
375         }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
376             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
377         }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
378             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
379         }else{
380             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
381             return -1;
382         }
383
384         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
385             return buf_size;
386     }
387
388
389 retry:
390     if(s->divx_packed && s->bitstream_buffer_size){
391         int i;
392         for(i=0; i<buf_size-3; i++){
393             if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
394                 if(buf[i+3]==0xB0){
395                     av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
396                     s->bitstream_buffer_size=0;
397                 }
398                 break;
399             }
400         }
401     }
402
403     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
404         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
405     }else
406         init_get_bits(&s->gb, buf, buf_size*8);
407     s->bitstream_buffer_size=0;
408
409     if (!s->context_initialized) {
410         if (ff_MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
411             return -1;
412     }
413
414     /* We need to set current_picture_ptr before reading the header,
415      * otherwise we cannot store anyting in there */
416     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
417         int i= ff_find_unused_picture(s, 0);
418         if (i < 0)
419             return i;
420         s->current_picture_ptr= &s->picture[i];
421     }
422
423     /* let's go :-) */
424     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
425         ret= ff_wmv2_decode_picture_header(s);
426     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
427         ret = ff_msmpeg4_decode_picture_header(s);
428     } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
429         if(s->avctx->extradata_size && s->picture_number==0){
430             GetBitContext gb;
431
432             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
433             ret = ff_mpeg4_decode_picture_header(s, &gb);
434         }
435         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
436     } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
437         ret = ff_intel_h263_decode_picture_header(s);
438     } else if (CONFIG_FLV_DECODER && s->h263_flv) {
439         ret = ff_flv_decode_picture_header(s);
440     } else {
441         ret = ff_h263_decode_picture_header(s);
442     }
443
444     if (ret < 0 || ret==FRAME_SKIPPED) {
445         if (   s->width  != avctx->coded_width
446             || s->height != avctx->coded_height) {
447                 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
448                 s->width = avctx->coded_width;
449                 s->height= avctx->coded_height;
450         }
451     }
452     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
453
454     /* skip if the header was thrashed */
455     if (ret < 0){
456         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
457         return -1;
458     } else if ((s->width  != avctx->coded_width  ||
459                 s->height != avctx->coded_height ||
460                 (s->width  + 15) >> 4 != s->mb_width ||
461                 (s->height + 15) >> 4 != s->mb_height) &&
462                (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))) {
463         av_log_missing_feature(s->avctx, "Width/height/bit depth/chroma idc changing with threads is", 0);
464         s->width = avctx->coded_width;
465         s->height= avctx->coded_height;
466         return AVERROR_PATCHWELCOME;   // width / height changed during parallelized decoding
467     }
468
469     avctx->has_b_frames= !s->low_delay;
470
471     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
472         if(s->stream_codec_tag == AV_RL32("XVID") ||
473            s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
474            s->codec_tag == AV_RL32("RMP4") ||
475            s->codec_tag == AV_RL32("SIPP")
476            )
477             s->xvid_build= 0;
478 #if 0
479         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
480            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
481             s->xvid_build= 0;
482 #endif
483     }
484
485     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
486         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
487             s->divx_version= 400; //divx 4
488     }
489
490     if(s->xvid_build>=0 && s->divx_version>=0){
491         s->divx_version=
492         s->divx_build= -1;
493     }
494
495     if(s->workaround_bugs&FF_BUG_AUTODETECT){
496         if(s->codec_tag == AV_RL32("XVIX"))
497             s->workaround_bugs|= FF_BUG_XVID_ILACE;
498
499         if(s->codec_tag == AV_RL32("UMP4")){
500             s->workaround_bugs|= FF_BUG_UMP4;
501         }
502
503         if(s->divx_version>=500 && s->divx_build<1814){
504             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
505         }
506
507         if(s->divx_version>502 && s->divx_build<1814){
508             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
509         }
510
511         if(s->xvid_build<=3U)
512             s->padding_bug_score= 256*256*256*64;
513
514         if(s->xvid_build<=1U)
515             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
516
517         if(s->xvid_build<=12U)
518             s->workaround_bugs|= FF_BUG_EDGE;
519
520         if(s->xvid_build<=32U)
521             s->workaround_bugs|= FF_BUG_DC_CLIP;
522
523 #define SET_QPEL_FUNC(postfix1, postfix2) \
524     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
525     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
526     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
527
528         if(s->lavc_build<4653U)
529             s->workaround_bugs|= FF_BUG_STD_QPEL;
530
531         if(s->lavc_build<4655U)
532             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
533
534         if(s->lavc_build<4670U){
535             s->workaround_bugs|= FF_BUG_EDGE;
536         }
537
538         if(s->lavc_build<=4712U)
539             s->workaround_bugs|= FF_BUG_DC_CLIP;
540
541         if(s->divx_version>=0)
542             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
543 //printf("padding_bug_score: %d\n", s->padding_bug_score);
544         if(s->divx_version==501 && s->divx_build==20020416)
545             s->padding_bug_score= 256*256*256*64;
546
547         if(s->divx_version<500U){
548             s->workaround_bugs|= FF_BUG_EDGE;
549         }
550
551         if(s->divx_version>=0)
552             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
553 #if 0
554         if(s->divx_version==500)
555             s->padding_bug_score= 256*256*256*64;
556
557         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
558          * Let us hope this at least works.
559          */
560         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
561            && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
562             s->workaround_bugs|= FF_BUG_NO_PADDING;
563
564         if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
565             s->workaround_bugs|= FF_BUG_NO_PADDING;
566 #endif
567     }
568
569     if(s->workaround_bugs& FF_BUG_STD_QPEL){
570         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
571         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
572         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
573         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
574         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
575         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
576
577         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
578         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
579         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
580         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
581         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
582         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
583     }
584
585     if(avctx->debug & FF_DEBUG_BUGS)
586         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
587                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
588                s->divx_packed ? "p" : "");
589
590 #if HAVE_MMX
591     if (s->codec_id == AV_CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
592         avctx->idct_algo= FF_IDCT_XVIDMMX;
593         ff_dct_common_init(s);
594     }
595 #endif
596
597         /* After H263 & mpeg4 header decode we have the height, width,*/
598         /* and other parameters. So then we could init the picture   */
599         /* FIXME: By the way H263 decoder is evolving it should have */
600         /* an H263EncContext                                         */
601
602     if (   s->width  != avctx->coded_width
603         || s->height != avctx->coded_height) {
604         /* H.263 could change picture size any time */
605         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
606
607         s->parse_context.buffer=0;
608         ff_MPV_common_end(s);
609         s->parse_context= pc;
610     }
611     if (!s->context_initialized) {
612         avcodec_set_dimensions(avctx, s->width, s->height);
613
614         goto retry;
615     }
616
617     if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
618         s->gob_index = ff_h263_get_gob_height(s);
619
620     // for skipping the frame
621     s->current_picture.f.pict_type = s->pict_type;
622     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
623
624     /* skip B-frames if we don't have reference frames */
625     if(s->last_picture_ptr==NULL && (s->pict_type==AV_PICTURE_TYPE_B || s->dropable)) return get_consumed_bytes(s, buf_size);
626     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
627        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
628        ||  avctx->skip_frame >= AVDISCARD_ALL)
629         return get_consumed_bytes(s, buf_size);
630
631     if(s->next_p_frame_damaged){
632         if(s->pict_type==AV_PICTURE_TYPE_B)
633             return get_consumed_bytes(s, buf_size);
634         else
635             s->next_p_frame_damaged=0;
636     }
637
638     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==AV_PICTURE_TYPE_B){
639         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
640         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
641     }else if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
642         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
643         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
644     }else{
645         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
646         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
647     }
648
649     if(ff_MPV_frame_start(s, avctx) < 0)
650         return -1;
651
652     if (!s->divx_packed) ff_thread_finish_setup(avctx);
653
654     if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
655         ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
656         goto frame_end;
657     }
658
659     if (avctx->hwaccel) {
660         if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
661             return -1;
662     }
663
664     ff_er_frame_start(s);
665
666     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
667     //which is not available before ff_MPV_frame_start()
668     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
669         ret = ff_wmv2_decode_secondary_picture_header(s);
670         if(ret<0) return ret;
671         if(ret==1) goto intrax8_decoded;
672     }
673
674     /* decode each macroblock */
675     s->mb_x=0;
676     s->mb_y=0;
677
678     ret = decode_slice(s);
679     while(s->mb_y<s->mb_height){
680         if(s->msmpeg4_version){
681             if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
682                 break;
683         }else{
684             int prev_x=s->mb_x, prev_y=s->mb_y;
685             if(ff_h263_resync(s)<0)
686                 break;
687             if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
688                 s->error_occurred = 1;
689         }
690
691         if(s->msmpeg4_version<4 && s->h263_pred)
692             ff_mpeg4_clean_buffers(s);
693
694         if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
695     }
696
697     if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
698         if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
699             s->error_status_table[s->mb_num-1]= ER_MB_ERROR;
700         }
701
702     assert(s->bitstream_buffer_size==0);
703 frame_end:
704     /* divx 5.01+ bistream reorder stuff */
705     if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
706         int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
707         int startcode_found=0;
708
709         if(buf_size - current_pos > 7){
710             int i;
711             for(i=current_pos; i<buf_size-4; i++){
712                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
713                     startcode_found=!(buf[i+4]&0x40);
714                     break;
715                 }
716             }
717         }
718
719         if(startcode_found){
720             av_fast_malloc(
721                 &s->bitstream_buffer,
722                 &s->allocated_bitstream_buffer_size,
723                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
724             if (!s->bitstream_buffer)
725                 return AVERROR(ENOMEM);
726             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
727             s->bitstream_buffer_size= buf_size - current_pos;
728         }
729     }
730
731 intrax8_decoded:
732     ff_er_frame_end(s);
733
734     if (avctx->hwaccel) {
735         if (avctx->hwaccel->end_frame(avctx) < 0)
736             return -1;
737     }
738
739     ff_MPV_frame_end(s);
740
741     assert(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
742     assert(s->current_picture.f.pict_type == s->pict_type);
743     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
744         *pict = s->current_picture_ptr->f;
745     } else if (s->last_picture_ptr != NULL) {
746         *pict = s->last_picture_ptr->f;
747     }
748
749     if(s->last_picture_ptr || s->low_delay){
750         *data_size = sizeof(AVFrame);
751         ff_print_debug_info(s, pict);
752     }
753
754 #ifdef PRINT_FRAME_TIME
755 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
756 #endif
757
758     return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
759 }
760
761 AVCodec ff_h263_decoder = {
762     .name           = "h263",
763     .type           = AVMEDIA_TYPE_VIDEO,
764     .id             = AV_CODEC_ID_H263,
765     .priv_data_size = sizeof(MpegEncContext),
766     .init           = ff_h263_decode_init,
767     .close          = ff_h263_decode_end,
768     .decode         = ff_h263_decode_frame,
769     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
770                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
771     .flush          = ff_mpeg_flush,
772     .max_lowres     = 3,
773     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
774     .pix_fmts       = ff_hwaccel_pixfmt_list_420,
775 };
776
777 AVCodec ff_h263p_decoder = {
778     .name           = "h263p",
779     .type           = AVMEDIA_TYPE_VIDEO,
780     .id             = AV_CODEC_ID_H263P,
781     .priv_data_size = sizeof(MpegEncContext),
782     .init           = ff_h263_decode_init,
783     .close          = ff_h263_decode_end,
784     .decode         = ff_h263_decode_frame,
785     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
786                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
787     .flush          = ff_mpeg_flush,
788     .max_lowres     = 3,
789     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
790     .pix_fmts       = ff_hwaccel_pixfmt_list_420,
791 };