Merge commit 'd46c588f3cb1963a00e990ceaf4ba9ffa05a716d'
[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
46 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
47 {
48     MpegEncContext *s = avctx->priv_data;
49     int ret;
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     if (avctx->codec->id == AV_CODEC_ID_MSS2)
64         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
65     else
66         avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
67     s->unrestricted_mv= 1;
68
69     /* select sub codec */
70     switch(avctx->codec->id) {
71     case AV_CODEC_ID_H263:
72     case AV_CODEC_ID_H263P:
73         s->unrestricted_mv= 0;
74         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
75         break;
76     case AV_CODEC_ID_MPEG4:
77         break;
78     case AV_CODEC_ID_MSMPEG4V1:
79         s->h263_pred = 1;
80         s->msmpeg4_version=1;
81         break;
82     case AV_CODEC_ID_MSMPEG4V2:
83         s->h263_pred = 1;
84         s->msmpeg4_version=2;
85         break;
86     case AV_CODEC_ID_MSMPEG4V3:
87         s->h263_pred = 1;
88         s->msmpeg4_version=3;
89         break;
90     case AV_CODEC_ID_WMV1:
91         s->h263_pred = 1;
92         s->msmpeg4_version=4;
93         break;
94     case AV_CODEC_ID_WMV2:
95         s->h263_pred = 1;
96         s->msmpeg4_version=5;
97         break;
98     case AV_CODEC_ID_VC1:
99     case AV_CODEC_ID_WMV3:
100     case AV_CODEC_ID_VC1IMAGE:
101     case AV_CODEC_ID_WMV3IMAGE:
102     case AV_CODEC_ID_MSS2:
103         s->h263_pred = 1;
104         s->msmpeg4_version=6;
105         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
106         break;
107     case AV_CODEC_ID_H263I:
108         break;
109     case AV_CODEC_ID_FLV1:
110         s->h263_flv = 1;
111         break;
112     default:
113         return AVERROR(EINVAL);
114     }
115     s->codec_id= avctx->codec->id;
116     avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
117
118     /* for h263, we allocate the images after having read the header */
119     if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
120         if ((ret = ff_MPV_common_init(s)) < 0)
121             return ret;
122
123         ff_h263_decode_init_vlc();
124
125     return 0;
126 }
127
128 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
129 {
130     MpegEncContext *s = avctx->priv_data;
131
132     ff_MPV_common_end(s);
133     return 0;
134 }
135
136 /**
137  * Return the number of bytes consumed for building the current frame.
138  */
139 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
140     int pos= (get_bits_count(&s->gb)+7)>>3;
141
142     if(s->divx_packed || s->avctx->hwaccel){
143         //we would have to scan through the whole buf to handle the weird reordering ...
144         return buf_size;
145     }else if(s->flags&CODEC_FLAG_TRUNCATED){
146         pos -= s->parse_context.last_index;
147         if(pos<0) pos=0; // padding is not really read so this might be -1
148         return pos;
149     }else{
150         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
151         if(pos+10>buf_size) pos=buf_size; // oops ;)
152
153         return pos;
154     }
155 }
156
157 static int decode_slice(MpegEncContext *s){
158     const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
159     const int mb_size= 16>>s->avctx->lowres;
160     int ret;
161
162     s->last_resync_gb= s->gb;
163     s->first_slice_line= 1;
164
165     s->resync_mb_x= s->mb_x;
166     s->resync_mb_y= s->mb_y;
167
168     ff_set_qscale(s, s->qscale);
169
170     if (s->avctx->hwaccel) {
171         const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
172         const uint8_t *end  = ff_h263_find_resync_marker(s, start + 1, s->gb.buffer_end);
173         skip_bits_long(&s->gb, 8*(end - start));
174         return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
175     }
176
177     if(s->partitioned_frame){
178         const int qscale= s->qscale;
179
180         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
181             if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
182                 return ret;
183         }
184
185         /* restore variables which were modified */
186         s->first_slice_line=1;
187         s->mb_x= s->resync_mb_x;
188         s->mb_y= s->resync_mb_y;
189         ff_set_qscale(s, qscale);
190     }
191
192     for(; s->mb_y < s->mb_height; s->mb_y++) {
193         /* per-row end of slice checks */
194         if(s->msmpeg4_version){
195             if(s->resync_mb_y + s->slice_height == s->mb_y){
196                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
197
198                 return 0;
199             }
200         }
201
202         if(s->msmpeg4_version==1){
203             s->last_dc[0]=
204             s->last_dc[1]=
205             s->last_dc[2]= 128;
206         }
207
208         ff_init_block_index(s);
209         for(; s->mb_x < s->mb_width; s->mb_x++) {
210             int ret;
211
212             ff_update_block_index(s);
213
214             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
215                 s->first_slice_line=0;
216             }
217
218             /* DCT & quantize */
219
220             s->mv_dir = MV_DIR_FORWARD;
221             s->mv_type = MV_TYPE_16X16;
222 //            s->mb_skipped = 0;
223             av_dlog(s, "%d %d %06X\n",
224                     ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
225             ret= s->decode_mb(s, s->block);
226
227             if (s->pict_type!=AV_PICTURE_TYPE_B)
228                 ff_h263_update_motion_val(s);
229
230             if(ret<0){
231                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
232                 if(ret==SLICE_END){
233                     ff_MPV_decode_mb(s, s->block);
234                     if(s->loop_filter)
235                         ff_h263_loop_filter(s);
236
237                     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);
238
239                     s->padding_bug_score--;
240
241                     if(++s->mb_x >= s->mb_width){
242                         s->mb_x=0;
243                         ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
244                         ff_MPV_report_decode_progress(s);
245                         s->mb_y++;
246                     }
247                     return 0;
248                 }else if(ret==SLICE_NOEND){
249                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
250                     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);
251                     return AVERROR_INVALIDDATA;
252                 }
253                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
254                 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);
255
256                 return AVERROR_INVALIDDATA;
257             }
258
259             ff_MPV_decode_mb(s, s->block);
260             if(s->loop_filter)
261                 ff_h263_loop_filter(s);
262         }
263
264         ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
265         ff_MPV_report_decode_progress(s);
266
267         s->mb_x= 0;
268     }
269
270     av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
271
272     if(s->codec_id==AV_CODEC_ID_MPEG4
273        && (s->workaround_bugs&FF_BUG_AUTODETECT)
274        && get_bits_left(&s->gb) >= 48
275        && show_bits(&s->gb, 24)==0x4010
276        && !s->data_partitioning)
277         s->padding_bug_score+=32;
278
279     /* try to detect the padding bug */
280     if(      s->codec_id==AV_CODEC_ID_MPEG4
281        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
282        &&    get_bits_left(&s->gb) >=0
283        &&    get_bits_left(&s->gb) < 137
284 //       &&   !s->resync_marker
285        &&   !s->data_partitioning){
286
287         const int bits_count= get_bits_count(&s->gb);
288         const int bits_left = s->gb.size_in_bits - bits_count;
289
290         if(bits_left==0){
291             s->padding_bug_score+=16;
292         } else if(bits_left != 1){
293             int v= show_bits(&s->gb, 8);
294             v|= 0x7F >> (7-(bits_count&7));
295
296             if(v==0x7F && bits_left<=8)
297                 s->padding_bug_score--;
298             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
299                 s->padding_bug_score+= 4;
300             else
301                 s->padding_bug_score++;
302         }
303     }
304
305     if(s->workaround_bugs&FF_BUG_AUTODETECT){
306         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
307             s->workaround_bugs |=  FF_BUG_NO_PADDING;
308         else
309             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
310     }
311
312     // handle formats which don't have unique end markers
313     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
314         int left= get_bits_left(&s->gb);
315         int max_extra=7;
316
317         /* no markers in M$ crap */
318         if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
319             max_extra+= 17;
320
321         /* buggy padding but the frame should still end approximately at the bitstream end */
322         if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
323             max_extra+= 48;
324         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
325             max_extra+= 256*256*256*64;
326
327         if(left>max_extra){
328             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
329         }
330         else if(left<0){
331             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
332         }else
333             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
334
335         return 0;
336     }
337
338     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
339             get_bits_left(&s->gb),
340             show_bits(&s->gb, 24), s->padding_bug_score);
341
342     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);
343
344     return AVERROR_INVALIDDATA;
345 }
346
347 int ff_h263_decode_frame(AVCodecContext *avctx,
348                              void *data, int *got_frame,
349                              AVPacket *avpkt)
350 {
351     const uint8_t *buf = avpkt->data;
352     int buf_size = avpkt->size;
353     MpegEncContext *s = avctx->priv_data;
354     int ret;
355     AVFrame *pict = data;
356
357     s->flags= avctx->flags;
358     s->flags2= avctx->flags2;
359
360     /* no supplementary picture */
361     if (buf_size == 0) {
362         /* special case for last picture */
363         if (s->low_delay==0 && s->next_picture_ptr) {
364             if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
365                 return ret;
366             s->next_picture_ptr= NULL;
367
368             *got_frame = 1;
369         }
370
371         return 0;
372     }
373
374     if(s->flags&CODEC_FLAG_TRUNCATED){
375         int next;
376
377         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
378             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
379         }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
380             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
381         }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
382             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
383         }else{
384             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
385             return AVERROR(EINVAL);
386         }
387
388         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
389             return buf_size;
390     }
391
392
393 retry:
394     if(s->divx_packed && s->bitstream_buffer_size){
395         int i;
396         for(i=0; i<buf_size-3; i++){
397             if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
398                 if(buf[i+3]==0xB0){
399                     av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
400                     s->bitstream_buffer_size=0;
401                 }
402                 break;
403             }
404         }
405     }
406
407     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
408         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
409     }else
410         init_get_bits(&s->gb, buf, buf_size*8);
411     s->bitstream_buffer_size=0;
412
413     if (!s->context_initialized) {
414         if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
415             return ret;
416     }
417
418     /* We need to set current_picture_ptr before reading the header,
419      * otherwise we cannot store anyting in there */
420     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
421         int i= ff_find_unused_picture(s, 0);
422         if (i < 0)
423             return i;
424         s->current_picture_ptr= &s->picture[i];
425     }
426
427     /* let's go :-) */
428     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
429         ret= ff_wmv2_decode_picture_header(s);
430     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
431         ret = ff_msmpeg4_decode_picture_header(s);
432     } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
433         if(s->avctx->extradata_size && s->picture_number==0){
434             GetBitContext gb;
435
436             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
437             ret = ff_mpeg4_decode_picture_header(s, &gb);
438         }
439         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
440     } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
441         ret = ff_intel_h263_decode_picture_header(s);
442     } else if (CONFIG_FLV_DECODER && s->h263_flv) {
443         ret = ff_flv_decode_picture_header(s);
444     } else {
445         ret = ff_h263_decode_picture_header(s);
446     }
447
448     if (ret < 0 || ret==FRAME_SKIPPED) {
449         if (   s->width  != avctx->coded_width
450             || s->height != avctx->coded_height) {
451                 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
452                 s->width = avctx->coded_width;
453                 s->height= avctx->coded_height;
454         }
455     }
456     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
457
458     /* skip if the header was thrashed */
459     if (ret < 0){
460         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
461         return ret;
462     }
463
464     avctx->has_b_frames= !s->low_delay;
465
466     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
467         if(s->stream_codec_tag == AV_RL32("XVID") ||
468            s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
469            s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") ||
470            s->codec_tag == AV_RL32("SIPP")
471            )
472             s->xvid_build= 0;
473 #if 0
474         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
475            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
476             s->xvid_build= 0;
477 #endif
478     }
479
480     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
481         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
482             s->divx_version= 400; //divx 4
483     }
484
485     if(s->xvid_build>=0 && s->divx_version>=0){
486         s->divx_version=
487         s->divx_build= -1;
488     }
489
490     if(s->workaround_bugs&FF_BUG_AUTODETECT){
491         if(s->codec_tag == AV_RL32("XVIX"))
492             s->workaround_bugs|= FF_BUG_XVID_ILACE;
493
494         if(s->codec_tag == AV_RL32("UMP4")){
495             s->workaround_bugs|= FF_BUG_UMP4;
496         }
497
498         if(s->divx_version>=500 && s->divx_build<1814){
499             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
500         }
501
502         if(s->divx_version>502 && s->divx_build<1814){
503             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
504         }
505
506         if(s->xvid_build<=3U)
507             s->padding_bug_score= 256*256*256*64;
508
509         if(s->xvid_build<=1U)
510             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
511
512         if(s->xvid_build<=12U)
513             s->workaround_bugs|= FF_BUG_EDGE;
514
515         if(s->xvid_build<=32U)
516             s->workaround_bugs|= FF_BUG_DC_CLIP;
517
518 #define SET_QPEL_FUNC(postfix1, postfix2) \
519     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
520     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
521     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
522
523         if(s->lavc_build<4653U)
524             s->workaround_bugs|= FF_BUG_STD_QPEL;
525
526         if(s->lavc_build<4655U)
527             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
528
529         if(s->lavc_build<4670U){
530             s->workaround_bugs|= FF_BUG_EDGE;
531         }
532
533         if(s->lavc_build<=4712U)
534             s->workaround_bugs|= FF_BUG_DC_CLIP;
535
536         if(s->divx_version>=0)
537             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
538         if(s->divx_version==501 && s->divx_build==20020416)
539             s->padding_bug_score= 256*256*256*64;
540
541         if(s->divx_version<500U){
542             s->workaround_bugs|= FF_BUG_EDGE;
543         }
544
545         if(s->divx_version>=0)
546             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
547 #if 0
548         if(s->divx_version==500)
549             s->padding_bug_score= 256*256*256*64;
550
551         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
552          * Let us hope this at least works.
553          */
554         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
555            && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
556             s->workaround_bugs|= FF_BUG_NO_PADDING;
557
558         if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
559             s->workaround_bugs|= FF_BUG_NO_PADDING;
560 #endif
561     }
562
563     if(s->workaround_bugs& FF_BUG_STD_QPEL){
564         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
565         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
566         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
567         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
568         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
569         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
570
571         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
572         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
573         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
574         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
575         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
576         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
577     }
578
579     if(avctx->debug & FF_DEBUG_BUGS)
580         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
581                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
582                s->divx_packed ? "p" : "");
583
584 #if HAVE_MMX
585     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)) {
586         avctx->idct_algo= FF_IDCT_XVIDMMX;
587         ff_dct_common_init(s);
588         goto retry;
589     }
590 #endif
591
592         /* After H263 & mpeg4 header decode we have the height, width,*/
593         /* and other parameters. So then we could init the picture   */
594         /* FIXME: By the way H263 decoder is evolving it should have */
595         /* an H263EncContext                                         */
596
597     if ((!avctx->coded_width || !avctx->coded_height) && 0) {
598         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
599
600         s->parse_context.buffer=0;
601         ff_MPV_common_end(s);
602         s->parse_context= pc;
603         avcodec_set_dimensions(avctx, s->width, s->height);
604
605         goto retry;
606     }
607
608     if (s->width  != avctx->coded_width  ||
609         s->height != avctx->coded_height ||
610         s->context_reinit) {
611         /* H.263 could change picture size any time */
612         s->context_reinit = 0;
613
614         avcodec_set_dimensions(avctx, s->width, s->height);
615
616         if ((ret = ff_MPV_common_frame_size_change(s)))
617             return ret;
618     }
619
620     if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
621         s->gob_index = ff_h263_get_gob_height(s);
622
623     // for skipping the frame
624     s->current_picture.f.pict_type = s->pict_type;
625     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
626
627     /* skip B-frames if we don't have reference frames */
628     if (s->last_picture_ptr == NULL &&
629         (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
630         return get_consumed_bytes(s, buf_size);
631     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
632        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
633        ||  avctx->skip_frame >= AVDISCARD_ALL)
634         return get_consumed_bytes(s, buf_size);
635
636     if(s->next_p_frame_damaged){
637         if(s->pict_type==AV_PICTURE_TYPE_B)
638             return get_consumed_bytes(s, buf_size);
639         else
640             s->next_p_frame_damaged=0;
641     }
642
643     if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
644         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
645         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
646     }else{
647         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
648         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
649     }
650
651     if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
652         return ret;
653
654     if (!s->divx_packed && !avctx->hwaccel)
655         ff_thread_finish_setup(avctx);
656
657     if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
658         ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
659         goto frame_end;
660     }
661
662     if (avctx->hwaccel) {
663         if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
664             return ret;
665     }
666
667     ff_mpeg_er_frame_start(s);
668
669     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
670     //which is not available before ff_MPV_frame_start()
671     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
672         ret = ff_wmv2_decode_secondary_picture_header(s);
673         if(ret<0) return ret;
674         if(ret==1) goto intrax8_decoded;
675     }
676
677     /* decode each macroblock */
678     s->mb_x=0;
679     s->mb_y=0;
680
681     ret = decode_slice(s);
682     while(s->mb_y<s->mb_height){
683         if(s->msmpeg4_version){
684             if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
685                 break;
686         }else{
687             int prev_x=s->mb_x, prev_y=s->mb_y;
688             if(ff_h263_resync(s)<0)
689                 break;
690             if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
691                 s->er.error_occurred = 1;
692         }
693
694         if(s->msmpeg4_version<4 && s->h263_pred)
695             ff_mpeg4_clean_buffers(s);
696
697         if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
698     }
699
700     if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
701         if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
702             s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
703         }
704
705     av_assert1(s->bitstream_buffer_size==0);
706 frame_end:
707     /* divx 5.01+ bitstream reorder stuff */
708     if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
709         int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
710         int startcode_found=0;
711
712         if(buf_size - current_pos > 7){
713             int i;
714             for(i=current_pos; i<buf_size-4; i++){
715                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
716                     startcode_found=!(buf[i+4]&0x40);
717                     break;
718                 }
719             }
720         }
721
722         if(startcode_found){
723             av_fast_malloc(
724                 &s->bitstream_buffer,
725                 &s->allocated_bitstream_buffer_size,
726                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
727             if (!s->bitstream_buffer)
728                 return AVERROR(ENOMEM);
729             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
730             s->bitstream_buffer_size= buf_size - current_pos;
731         }
732     }
733
734 intrax8_decoded:
735     ff_er_frame_end(&s->er);
736
737     if (avctx->hwaccel) {
738         if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
739             return ret;
740     }
741
742     ff_MPV_frame_end(s);
743
744     if (!s->divx_packed && avctx->hwaccel)
745         ff_thread_finish_setup(avctx);
746
747     av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
748     av_assert1(s->current_picture.f.pict_type == s->pict_type);
749     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
750         if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
751             return ret;
752         ff_print_debug_info(s, s->current_picture_ptr, pict);
753         ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
754     } else if (s->last_picture_ptr != NULL) {
755         if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
756             return ret;
757         ff_print_debug_info(s, s->last_picture_ptr, pict);
758         ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
759     }
760
761     if(s->last_picture_ptr || s->low_delay){
762         *got_frame = 1;
763     }
764
765     return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
766 }
767
768 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
769 #if CONFIG_VAAPI
770     AV_PIX_FMT_VAAPI_VLD,
771 #endif
772 #if CONFIG_VDPAU
773     AV_PIX_FMT_VDPAU,
774 #endif
775     AV_PIX_FMT_YUV420P,
776     AV_PIX_FMT_NONE
777 };
778
779 AVCodec ff_h263_decoder = {
780     .name           = "h263",
781     .type           = AVMEDIA_TYPE_VIDEO,
782     .id             = AV_CODEC_ID_H263,
783     .priv_data_size = sizeof(MpegEncContext),
784     .init           = ff_h263_decode_init,
785     .close          = ff_h263_decode_end,
786     .decode         = ff_h263_decode_frame,
787     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
788                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
789     .flush          = ff_mpeg_flush,
790     .max_lowres     = 3,
791     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
792     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
793 };
794
795 AVCodec ff_h263p_decoder = {
796     .name           = "h263p",
797     .type           = AVMEDIA_TYPE_VIDEO,
798     .id             = AV_CODEC_ID_H263P,
799     .priv_data_size = sizeof(MpegEncContext),
800     .init           = ff_h263_decode_init,
801     .close          = ff_h263_decode_end,
802     .decode         = ff_h263_decode_frame,
803     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
804                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
805     .flush          = ff_mpeg_flush,
806     .max_lowres     = 3,
807     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
808     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
809 };