Add thread-safe wrapper for get_format().
[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 "error_resilience.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     int ret;
51
52     s->avctx = avctx;
53     s->out_format = FMT_H263;
54
55     s->width  = avctx->coded_width;
56     s->height = avctx->coded_height;
57     s->workaround_bugs= avctx->workaround_bugs;
58
59     // set defaults
60     ff_MPV_decode_defaults(s);
61     s->quant_precision=5;
62     s->decode_mb= ff_h263_decode_mb;
63     s->low_delay= 1;
64     if (avctx->codec->id == AV_CODEC_ID_MSS2)
65         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
66     else
67         avctx->pix_fmt = ff_thread_get_format(avctx, avctx->codec->pix_fmts);
68     s->unrestricted_mv= 1;
69
70     /* select sub codec */
71     switch(avctx->codec->id) {
72     case AV_CODEC_ID_H263:
73     case AV_CODEC_ID_H263P:
74         s->unrestricted_mv= 0;
75         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
76         break;
77     case AV_CODEC_ID_MPEG4:
78         break;
79     case AV_CODEC_ID_MSMPEG4V1:
80         s->h263_pred = 1;
81         s->msmpeg4_version=1;
82         break;
83     case AV_CODEC_ID_MSMPEG4V2:
84         s->h263_pred = 1;
85         s->msmpeg4_version=2;
86         break;
87     case AV_CODEC_ID_MSMPEG4V3:
88         s->h263_pred = 1;
89         s->msmpeg4_version=3;
90         break;
91     case AV_CODEC_ID_WMV1:
92         s->h263_pred = 1;
93         s->msmpeg4_version=4;
94         break;
95     case AV_CODEC_ID_WMV2:
96         s->h263_pred = 1;
97         s->msmpeg4_version=5;
98         break;
99     case AV_CODEC_ID_VC1:
100     case AV_CODEC_ID_WMV3:
101     case AV_CODEC_ID_VC1IMAGE:
102     case AV_CODEC_ID_WMV3IMAGE:
103     case AV_CODEC_ID_MSS2:
104         s->h263_pred = 1;
105         s->msmpeg4_version=6;
106         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
107         break;
108     case AV_CODEC_ID_H263I:
109         break;
110     case AV_CODEC_ID_FLV1:
111         s->h263_flv = 1;
112         break;
113     default:
114         return AVERROR(EINVAL);
115     }
116     s->codec_id= avctx->codec->id;
117     avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
118
119     /* for h263, we allocate the images after having read the header */
120     if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
121         if ((ret = ff_MPV_common_init(s)) < 0)
122             return ret;
123
124         ff_h263_decode_init_vlc();
125
126     return 0;
127 }
128
129 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
130 {
131     MpegEncContext *s = avctx->priv_data;
132
133     ff_MPV_common_end(s);
134     return 0;
135 }
136
137 /**
138  * Return the number of bytes consumed for building the current frame.
139  */
140 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
141     int pos= (get_bits_count(&s->gb)+7)>>3;
142
143     if(s->divx_packed || s->avctx->hwaccel){
144         //we would have to scan through the whole buf to handle the weird reordering ...
145         return buf_size;
146     }else if(s->flags&CODEC_FLAG_TRUNCATED){
147         pos -= s->parse_context.last_index;
148         if(pos<0) pos=0; // padding is not really read so this might be -1
149         return pos;
150     }else{
151         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
152         if(pos+10>buf_size) pos=buf_size; // oops ;)
153
154         return pos;
155     }
156 }
157
158 static int decode_slice(MpegEncContext *s){
159     const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
160     const int mb_size= 16>>s->avctx->lowres;
161     int ret;
162
163     s->last_resync_gb= s->gb;
164     s->first_slice_line= 1;
165
166     s->resync_mb_x= s->mb_x;
167     s->resync_mb_y= s->mb_y;
168
169     ff_set_qscale(s, s->qscale);
170
171     if (s->avctx->hwaccel) {
172         const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
173         const uint8_t *end  = ff_h263_find_resync_marker(s, start + 1, s->gb.buffer_end);
174         skip_bits_long(&s->gb, 8*(end - start));
175         return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
176     }
177
178     if(s->partitioned_frame){
179         const int qscale= s->qscale;
180
181         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
182             if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
183                 return ret;
184         }
185
186         /* restore variables which were modified */
187         s->first_slice_line=1;
188         s->mb_x= s->resync_mb_x;
189         s->mb_y= s->resync_mb_y;
190         ff_set_qscale(s, qscale);
191     }
192
193     for(; s->mb_y < s->mb_height; s->mb_y++) {
194         /* per-row end of slice checks */
195         if(s->msmpeg4_version){
196             if(s->resync_mb_y + s->slice_height == s->mb_y){
197                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
198
199                 return 0;
200             }
201         }
202
203         if(s->msmpeg4_version==1){
204             s->last_dc[0]=
205             s->last_dc[1]=
206             s->last_dc[2]= 128;
207         }
208
209         ff_init_block_index(s);
210         for(; s->mb_x < s->mb_width; s->mb_x++) {
211             int ret;
212
213             ff_update_block_index(s);
214
215             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
216                 s->first_slice_line=0;
217             }
218
219             /* DCT & quantize */
220
221             s->mv_dir = MV_DIR_FORWARD;
222             s->mv_type = MV_TYPE_16X16;
223 //            s->mb_skipped = 0;
224             av_dlog(s, "%d %d %06X\n",
225                     ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
226             ret= s->decode_mb(s, s->block);
227
228             if (s->pict_type!=AV_PICTURE_TYPE_B)
229                 ff_h263_update_motion_val(s);
230
231             if(ret<0){
232                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
233                 if(ret==SLICE_END){
234                     ff_MPV_decode_mb(s, s->block);
235                     if(s->loop_filter)
236                         ff_h263_loop_filter(s);
237
238                     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
239
240                     s->padding_bug_score--;
241
242                     if(++s->mb_x >= s->mb_width){
243                         s->mb_x=0;
244                         ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
245                         ff_MPV_report_decode_progress(s);
246                         s->mb_y++;
247                     }
248                     return 0;
249                 }else if(ret==SLICE_NOEND){
250                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
251                     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
252                     return AVERROR_INVALIDDATA;
253                 }
254                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
255                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
256
257                 return AVERROR_INVALIDDATA;
258             }
259
260             ff_MPV_decode_mb(s, s->block);
261             if(s->loop_filter)
262                 ff_h263_loop_filter(s);
263         }
264
265         ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
266         ff_MPV_report_decode_progress(s);
267
268         s->mb_x= 0;
269     }
270
271     av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
272
273     if(s->codec_id==AV_CODEC_ID_MPEG4
274        && (s->workaround_bugs&FF_BUG_AUTODETECT)
275        && get_bits_left(&s->gb) >= 48
276        && show_bits(&s->gb, 24)==0x4010
277        && !s->data_partitioning)
278         s->padding_bug_score+=32;
279
280     /* try to detect the padding bug */
281     if(      s->codec_id==AV_CODEC_ID_MPEG4
282        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
283        &&    get_bits_left(&s->gb) >=0
284        &&    get_bits_left(&s->gb) < 137
285 //       &&   !s->resync_marker
286        &&   !s->data_partitioning){
287
288         const int bits_count= get_bits_count(&s->gb);
289         const int bits_left = s->gb.size_in_bits - bits_count;
290
291         if(bits_left==0){
292             s->padding_bug_score+=16;
293         } else if(bits_left != 1){
294             int v= show_bits(&s->gb, 8);
295             v|= 0x7F >> (7-(bits_count&7));
296
297             if(v==0x7F && bits_left<=8)
298                 s->padding_bug_score--;
299             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
300                 s->padding_bug_score+= 4;
301             else
302                 s->padding_bug_score++;
303         }
304     }
305
306     if(s->workaround_bugs&FF_BUG_AUTODETECT){
307         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
308             s->workaround_bugs |=  FF_BUG_NO_PADDING;
309         else
310             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
311     }
312
313     // handle formats which don't have unique end markers
314     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
315         int left= get_bits_left(&s->gb);
316         int max_extra=7;
317
318         /* no markers in M$ crap */
319         if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
320             max_extra+= 17;
321
322         /* buggy padding but the frame should still end approximately at the bitstream end */
323         if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
324             max_extra+= 48;
325         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
326             max_extra+= 256*256*256*64;
327
328         if(left>max_extra){
329             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
330         }
331         else if(left<0){
332             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
333         }else
334             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
335
336         return 0;
337     }
338
339     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
340             get_bits_left(&s->gb),
341             show_bits(&s->gb, 24), s->padding_bug_score);
342
343     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
344
345     return AVERROR_INVALIDDATA;
346 }
347
348 int ff_h263_decode_frame(AVCodecContext *avctx,
349                              void *data, int *got_frame,
350                              AVPacket *avpkt)
351 {
352     const uint8_t *buf = avpkt->data;
353     int buf_size = avpkt->size;
354     MpegEncContext *s = avctx->priv_data;
355     int ret;
356     AVFrame *pict = data;
357
358 #ifdef PRINT_FRAME_TIME
359 uint64_t time= rdtsc();
360 #endif
361     s->flags= avctx->flags;
362     s->flags2= avctx->flags2;
363
364     /* no supplementary picture */
365     if (buf_size == 0) {
366         /* special case for last picture */
367         if (s->low_delay==0 && s->next_picture_ptr) {
368             if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
369                 return ret;
370             s->next_picture_ptr= NULL;
371
372             *got_frame = 1;
373         }
374
375         return 0;
376     }
377
378     if(s->flags&CODEC_FLAG_TRUNCATED){
379         int next;
380
381         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
382             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
383         }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
384             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
385         }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
386             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
387         }else{
388             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
389             return AVERROR(EINVAL);
390         }
391
392         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
393             return buf_size;
394     }
395
396
397 retry:
398     if(s->divx_packed && s->bitstream_buffer_size){
399         int i;
400         for(i=0; i<buf_size-3; i++){
401             if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
402                 if(buf[i+3]==0xB0){
403                     av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
404                     s->bitstream_buffer_size=0;
405                 }
406                 break;
407             }
408         }
409     }
410
411     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
412         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
413     }else
414         init_get_bits(&s->gb, buf, buf_size*8);
415     s->bitstream_buffer_size=0;
416
417     if (!s->context_initialized) {
418         if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
419             return ret;
420     }
421
422     /* We need to set current_picture_ptr before reading the header,
423      * otherwise we cannot store anyting in there */
424     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
425         int i= ff_find_unused_picture(s, 0);
426         if (i < 0)
427             return i;
428         s->current_picture_ptr= &s->picture[i];
429     }
430
431     /* let's go :-) */
432     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
433         ret= ff_wmv2_decode_picture_header(s);
434     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
435         ret = ff_msmpeg4_decode_picture_header(s);
436     } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
437         if(s->avctx->extradata_size && s->picture_number==0){
438             GetBitContext gb;
439
440             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
441             ret = ff_mpeg4_decode_picture_header(s, &gb);
442         }
443         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
444     } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
445         ret = ff_intel_h263_decode_picture_header(s);
446     } else if (CONFIG_FLV_DECODER && s->h263_flv) {
447         ret = ff_flv_decode_picture_header(s);
448     } else {
449         ret = ff_h263_decode_picture_header(s);
450     }
451
452     if (ret < 0 || ret==FRAME_SKIPPED) {
453         if (   s->width  != avctx->coded_width
454             || s->height != avctx->coded_height) {
455                 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
456                 s->width = avctx->coded_width;
457                 s->height= avctx->coded_height;
458         }
459     }
460     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
461
462     /* skip if the header was thrashed */
463     if (ret < 0){
464         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
465         return ret;
466     }
467
468     avctx->has_b_frames= !s->low_delay;
469
470     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
471         if(s->stream_codec_tag == AV_RL32("XVID") ||
472            s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
473            s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") ||
474            s->codec_tag == AV_RL32("SIPP")
475            )
476             s->xvid_build= 0;
477 #if 0
478         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
479            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
480             s->xvid_build= 0;
481 #endif
482     }
483
484     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
485         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
486             s->divx_version= 400; //divx 4
487     }
488
489     if(s->xvid_build>=0 && s->divx_version>=0){
490         s->divx_version=
491         s->divx_build= -1;
492     }
493
494     if(s->workaround_bugs&FF_BUG_AUTODETECT){
495         if(s->codec_tag == AV_RL32("XVIX"))
496             s->workaround_bugs|= FF_BUG_XVID_ILACE;
497
498         if(s->codec_tag == AV_RL32("UMP4")){
499             s->workaround_bugs|= FF_BUG_UMP4;
500         }
501
502         if(s->divx_version>=500 && s->divx_build<1814){
503             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
504         }
505
506         if(s->divx_version>502 && s->divx_build<1814){
507             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
508         }
509
510         if(s->xvid_build<=3U)
511             s->padding_bug_score= 256*256*256*64;
512
513         if(s->xvid_build<=1U)
514             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
515
516         if(s->xvid_build<=12U)
517             s->workaround_bugs|= FF_BUG_EDGE;
518
519         if(s->xvid_build<=32U)
520             s->workaround_bugs|= FF_BUG_DC_CLIP;
521
522 #define SET_QPEL_FUNC(postfix1, postfix2) \
523     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
524     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
525     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
526
527         if(s->lavc_build<4653U)
528             s->workaround_bugs|= FF_BUG_STD_QPEL;
529
530         if(s->lavc_build<4655U)
531             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
532
533         if(s->lavc_build<4670U){
534             s->workaround_bugs|= FF_BUG_EDGE;
535         }
536
537         if(s->lavc_build<=4712U)
538             s->workaround_bugs|= FF_BUG_DC_CLIP;
539
540         if(s->divx_version>=0)
541             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
542         if(s->divx_version==501 && s->divx_build==20020416)
543             s->padding_bug_score= 256*256*256*64;
544
545         if(s->divx_version<500U){
546             s->workaround_bugs|= FF_BUG_EDGE;
547         }
548
549         if(s->divx_version>=0)
550             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
551 #if 0
552         if(s->divx_version==500)
553             s->padding_bug_score= 256*256*256*64;
554
555         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
556          * Let us hope this at least works.
557          */
558         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
559            && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
560             s->workaround_bugs|= FF_BUG_NO_PADDING;
561
562         if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
563             s->workaround_bugs|= FF_BUG_NO_PADDING;
564 #endif
565     }
566
567     if(s->workaround_bugs& FF_BUG_STD_QPEL){
568         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
569         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
570         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
571         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
572         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
573         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
574
575         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
576         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
577         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
578         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
579         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
580         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
581     }
582
583     if(avctx->debug & FF_DEBUG_BUGS)
584         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
585                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
586                s->divx_packed ? "p" : "");
587
588 #if HAVE_MMX
589     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)) {
590         avctx->idct_algo= FF_IDCT_XVIDMMX;
591         ff_dct_common_init(s);
592         goto retry;
593     }
594 #endif
595
596         /* After H263 & mpeg4 header decode we have the height, width,*/
597         /* and other parameters. So then we could init the picture   */
598         /* FIXME: By the way H263 decoder is evolving it should have */
599         /* an H263EncContext                                         */
600
601     if ((!avctx->coded_width || !avctx->coded_height) && 0) {
602         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
603
604         s->parse_context.buffer=0;
605         ff_MPV_common_end(s);
606         s->parse_context= pc;
607         avcodec_set_dimensions(avctx, s->width, s->height);
608
609         goto retry;
610     }
611
612     if (s->width  != avctx->coded_width  ||
613         s->height != avctx->coded_height ||
614         s->context_reinit) {
615         /* H.263 could change picture size any time */
616         s->context_reinit = 0;
617
618         avcodec_set_dimensions(avctx, s->width, s->height);
619
620         if ((ret = ff_MPV_common_frame_size_change(s)))
621             return ret;
622     }
623
624     if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
625         s->gob_index = ff_h263_get_gob_height(s);
626
627     // for skipping the frame
628     s->current_picture.f.pict_type = s->pict_type;
629     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
630
631     /* skip B-frames if we don't have reference frames */
632     if (s->last_picture_ptr == NULL &&
633         (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
634         return get_consumed_bytes(s, buf_size);
635     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
636        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
637        ||  avctx->skip_frame >= AVDISCARD_ALL)
638         return get_consumed_bytes(s, buf_size);
639
640     if(s->next_p_frame_damaged){
641         if(s->pict_type==AV_PICTURE_TYPE_B)
642             return get_consumed_bytes(s, buf_size);
643         else
644             s->next_p_frame_damaged=0;
645     }
646
647     if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
648         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
649         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
650     }else{
651         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
652         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
653     }
654
655     if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
656         return ret;
657
658     if (!s->divx_packed && !avctx->hwaccel)
659         ff_thread_finish_setup(avctx);
660
661     if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
662         ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
663         goto frame_end;
664     }
665
666     if (avctx->hwaccel) {
667         if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
668             return ret;
669     }
670
671     ff_mpeg_er_frame_start(s);
672
673     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
674     //which is not available before ff_MPV_frame_start()
675     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
676         ret = ff_wmv2_decode_secondary_picture_header(s);
677         if(ret<0) return ret;
678         if(ret==1) goto intrax8_decoded;
679     }
680
681     /* decode each macroblock */
682     s->mb_x=0;
683     s->mb_y=0;
684
685     ret = decode_slice(s);
686     while(s->mb_y<s->mb_height){
687         if(s->msmpeg4_version){
688             if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
689                 break;
690         }else{
691             int prev_x=s->mb_x, prev_y=s->mb_y;
692             if(ff_h263_resync(s)<0)
693                 break;
694             if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
695                 s->er.error_occurred = 1;
696         }
697
698         if(s->msmpeg4_version<4 && s->h263_pred)
699             ff_mpeg4_clean_buffers(s);
700
701         if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
702     }
703
704     if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
705         if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
706             s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
707         }
708
709     av_assert1(s->bitstream_buffer_size==0);
710 frame_end:
711     /* divx 5.01+ bitstream reorder stuff */
712     if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
713         int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
714         int startcode_found=0;
715
716         if(buf_size - current_pos > 7){
717             int i;
718             for(i=current_pos; i<buf_size-4; i++){
719                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
720                     startcode_found=!(buf[i+4]&0x40);
721                     break;
722                 }
723             }
724         }
725
726         if(startcode_found){
727             av_fast_malloc(
728                 &s->bitstream_buffer,
729                 &s->allocated_bitstream_buffer_size,
730                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
731             if (!s->bitstream_buffer)
732                 return AVERROR(ENOMEM);
733             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
734             s->bitstream_buffer_size= buf_size - current_pos;
735         }
736     }
737
738 intrax8_decoded:
739     ff_er_frame_end(&s->er);
740
741     if (avctx->hwaccel) {
742         if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
743             return ret;
744     }
745
746     ff_MPV_frame_end(s);
747
748     if (!s->divx_packed && avctx->hwaccel)
749         ff_thread_finish_setup(avctx);
750
751     av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
752     av_assert1(s->current_picture.f.pict_type == s->pict_type);
753     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
754         if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
755             return ret;
756         ff_print_debug_info(s, s->current_picture_ptr, pict);
757         ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
758     } else if (s->last_picture_ptr != NULL) {
759         if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
760             return ret;
761         ff_print_debug_info(s, s->last_picture_ptr, pict);
762         ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
763     }
764
765     if(s->last_picture_ptr || s->low_delay){
766         *got_frame = 1;
767     }
768
769 #ifdef PRINT_FRAME_TIME
770 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
771 #endif
772
773     return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
774 }
775
776 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
777 #if CONFIG_VAAPI
778     AV_PIX_FMT_VAAPI_VLD,
779 #endif
780 #if CONFIG_VDPAU
781     AV_PIX_FMT_VDPAU,
782 #endif
783     AV_PIX_FMT_YUV420P,
784     AV_PIX_FMT_NONE
785 };
786
787 AVCodec ff_h263_decoder = {
788     .name           = "h263",
789     .type           = AVMEDIA_TYPE_VIDEO,
790     .id             = AV_CODEC_ID_H263,
791     .priv_data_size = sizeof(MpegEncContext),
792     .init           = ff_h263_decode_init,
793     .close          = ff_h263_decode_end,
794     .decode         = ff_h263_decode_frame,
795     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
796                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
797     .flush          = ff_mpeg_flush,
798     .max_lowres     = 3,
799     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
800     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
801 };
802
803 AVCodec ff_h263p_decoder = {
804     .name           = "h263p",
805     .type           = AVMEDIA_TYPE_VIDEO,
806     .id             = AV_CODEC_ID_H263P,
807     .priv_data_size = sizeof(MpegEncContext),
808     .init           = ff_h263_decode_init,
809     .close          = ff_h263_decode_end,
810     .decode         = ff_h263_decode_frame,
811     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
812                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
813     .flush          = ff_mpeg_flush,
814     .max_lowres     = 3,
815     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
816     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
817 };