4cd2ce85aa72899f2bdd02bed44396e16769a7cf
[libav.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 libavcodec/h263dec.c
25 * H.263 decoder.
26 */
27
28 #include "avcodec.h"
29 #include "dsputil.h"
30 #include "mpegvideo.h"
31 #include "h263_parser.h"
32 #include "mpeg4video_parser.h"
33 #include "msmpeg4.h"
34
35 //#define DEBUG
36 //#define PRINT_FRAME_TIME
37
38 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
39 {
40 MpegEncContext *s = avctx->priv_data;
41
42 s->avctx = avctx;
43 s->out_format = FMT_H263;
44
45 s->width = avctx->coded_width;
46 s->height = avctx->coded_height;
47 s->workaround_bugs= avctx->workaround_bugs;
48
49 // set defaults
50 MPV_decode_defaults(s);
51 s->quant_precision=5;
52 s->decode_mb= ff_h263_decode_mb;
53 s->low_delay= 1;
54 avctx->pix_fmt= PIX_FMT_YUV420P;
55 s->unrestricted_mv= 1;
56
57 /* select sub codec */
58 switch(avctx->codec->id) {
59 case CODEC_ID_H263:
60 s->unrestricted_mv= 0;
61 break;
62 case CODEC_ID_MPEG4:
63 s->decode_mb= ff_mpeg4_decode_mb;
64 s->time_increment_bits = 4; /* default value for broken headers */
65 s->h263_pred = 1;
66 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
67 break;
68 case CODEC_ID_MSMPEG4V1:
69 s->h263_msmpeg4 = 1;
70 s->h263_pred = 1;
71 s->msmpeg4_version=1;
72 break;
73 case CODEC_ID_MSMPEG4V2:
74 s->h263_msmpeg4 = 1;
75 s->h263_pred = 1;
76 s->msmpeg4_version=2;
77 break;
78 case CODEC_ID_MSMPEG4V3:
79 s->h263_msmpeg4 = 1;
80 s->h263_pred = 1;
81 s->msmpeg4_version=3;
82 break;
83 case CODEC_ID_WMV1:
84 s->h263_msmpeg4 = 1;
85 s->h263_pred = 1;
86 s->msmpeg4_version=4;
87 break;
88 case CODEC_ID_WMV2:
89 s->h263_msmpeg4 = 1;
90 s->h263_pred = 1;
91 s->msmpeg4_version=5;
92 break;
93 case CODEC_ID_VC1:
94 case CODEC_ID_WMV3:
95 s->h263_msmpeg4 = 1;
96 s->h263_pred = 1;
97 s->msmpeg4_version=6;
98 break;
99 case CODEC_ID_H263I:
100 break;
101 case CODEC_ID_FLV1:
102 s->h263_flv = 1;
103 break;
104 default:
105 return -1;
106 }
107 s->codec_id= avctx->codec->id;
108
109 /* for h263, we allocate the images after having read the header */
110 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
111 if (MPV_common_init(s) < 0)
112 return -1;
113
114 if (CONFIG_MSMPEG4_DECODER && s->h263_msmpeg4)
115 ff_msmpeg4_decode_init(s);
116 else
117 h263_decode_init_vlc(s);
118
119 return 0;
120 }
121
122 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
123 {
124 MpegEncContext *s = avctx->priv_data;
125
126 MPV_common_end(s);
127 return 0;
128 }
129
130 /**
131 * returns the number of bytes consumed for building the current frame
132 */
133 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
134 int pos= (get_bits_count(&s->gb)+7)>>3;
135
136 if(s->divx_packed){
137 //we would have to scan through the whole buf to handle the weird reordering ...
138 return buf_size;
139 }else if(s->flags&CODEC_FLAG_TRUNCATED){
140 pos -= s->parse_context.last_index;
141 if(pos<0) pos=0; // padding is not really read so this might be -1
142 return pos;
143 }else{
144 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
145 if(pos+10>buf_size) pos=buf_size; // oops ;)
146
147 return pos;
148 }
149 }
150
151 static int decode_slice(MpegEncContext *s){
152 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
153 const int mb_size= 16>>s->avctx->lowres;
154 s->last_resync_gb= s->gb;
155 s->first_slice_line= 1;
156
157 s->resync_mb_x= s->mb_x;
158 s->resync_mb_y= s->mb_y;
159
160 ff_set_qscale(s, s->qscale);
161
162 if(s->partitioned_frame){
163 const int qscale= s->qscale;
164
165 if(s->codec_id==CODEC_ID_MPEG4){
166 if(ff_mpeg4_decode_partitions(s) < 0)
167 return -1;
168 }
169
170 /* restore variables which were modified */
171 s->first_slice_line=1;
172 s->mb_x= s->resync_mb_x;
173 s->mb_y= s->resync_mb_y;
174 ff_set_qscale(s, qscale);
175 }
176
177 for(; s->mb_y < s->mb_height; s->mb_y++) {
178 /* per-row end of slice checks */
179 if(s->msmpeg4_version){
180 if(s->resync_mb_y + s->slice_height == s->mb_y){
181 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
182
183 return 0;
184 }
185 }
186
187 if(s->msmpeg4_version==1){
188 s->last_dc[0]=
189 s->last_dc[1]=
190 s->last_dc[2]= 128;
191 }
192
193 ff_init_block_index(s);
194 for(; s->mb_x < s->mb_width; s->mb_x++) {
195 int ret;
196
197 ff_update_block_index(s);
198
199 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
200 s->first_slice_line=0;
201 }
202
203 /* DCT & quantize */
204
205 s->mv_dir = MV_DIR_FORWARD;
206 s->mv_type = MV_TYPE_16X16;
207 // s->mb_skipped = 0;
208 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
209 ret= s->decode_mb(s, s->block);
210
211 if (s->pict_type!=FF_B_TYPE)
212 ff_h263_update_motion_val(s);
213
214 if(ret<0){
215 const int xy= s->mb_x + s->mb_y*s->mb_stride;
216 if(ret==SLICE_END){
217 MPV_decode_mb(s, s->block);
218 if(s->loop_filter)
219 ff_h263_loop_filter(s);
220
221 //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));
222 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
223
224 s->padding_bug_score--;
225
226 if(++s->mb_x >= s->mb_width){
227 s->mb_x=0;
228 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
229 s->mb_y++;
230 }
231 return 0;
232 }else if(ret==SLICE_NOEND){
233 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
234 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
235 return -1;
236 }
237 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
238 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
239
240 return -1;
241 }
242
243 MPV_decode_mb(s, s->block);
244 if(s->loop_filter)
245 ff_h263_loop_filter(s);
246 }
247
248 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
249
250 s->mb_x= 0;
251 }
252
253 assert(s->mb_x==0 && s->mb_y==s->mb_height);
254
255 /* try to detect the padding bug */
256 if( s->codec_id==CODEC_ID_MPEG4
257 && (s->workaround_bugs&FF_BUG_AUTODETECT)
258 && s->gb.size_in_bits - get_bits_count(&s->gb) >=0
259 && s->gb.size_in_bits - get_bits_count(&s->gb) < 48
260 // && !s->resync_marker
261 && !s->data_partitioning){
262
263 const int bits_count= get_bits_count(&s->gb);
264 const int bits_left = s->gb.size_in_bits - bits_count;
265
266 if(bits_left==0){
267 s->padding_bug_score+=16;
268 } else if(bits_left != 1){
269 int v= show_bits(&s->gb, 8);
270 v|= 0x7F >> (7-(bits_count&7));
271
272 if(v==0x7F && bits_left<=8)
273 s->padding_bug_score--;
274 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
275 s->padding_bug_score+= 4;
276 else
277 s->padding_bug_score++;
278 }
279 }
280
281 if(s->workaround_bugs&FF_BUG_AUTODETECT){
282 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
283 s->workaround_bugs |= FF_BUG_NO_PADDING;
284 else
285 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
286 }
287
288 // handle formats which don't have unique end markers
289 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
290 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
291 int max_extra=7;
292
293 /* no markers in M$ crap */
294 if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
295 max_extra+= 17;
296
297 /* buggy padding but the frame should still end approximately at the bitstream end */
298 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
299 max_extra+= 48;
300 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
301 max_extra+= 256*256*256*64;
302
303 if(left>max_extra){
304 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
305 }
306 else if(left<0){
307 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
308 }else
309 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
310
311 return 0;
312 }
313
314 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
315 s->gb.size_in_bits - get_bits_count(&s->gb),
316 show_bits(&s->gb, 24), s->padding_bug_score);
317
318 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
319
320 return -1;
321 }
322
323 int ff_h263_decode_frame(AVCodecContext *avctx,
324 void *data, int *data_size,
325 const uint8_t *buf, int buf_size)
326 {
327 MpegEncContext *s = avctx->priv_data;
328 int ret;
329 AVFrame *pict = data;
330
331 #ifdef PRINT_FRAME_TIME
332 uint64_t time= rdtsc();
333 #endif
334 #ifdef DEBUG
335 av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
336 if(buf_size>0)
337 av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
338 #endif
339 s->flags= avctx->flags;
340 s->flags2= avctx->flags2;
341
342 /* no supplementary picture */
343 if (buf_size == 0) {
344 /* special case for last picture */
345 if (s->low_delay==0 && s->next_picture_ptr) {
346 *pict= *(AVFrame*)s->next_picture_ptr;
347 s->next_picture_ptr= NULL;
348
349 *data_size = sizeof(AVFrame);
350 }
351
352 return 0;
353 }
354
355 if(s->flags&CODEC_FLAG_TRUNCATED){
356 int next;
357
358 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
359 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
360 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
361 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
362 }else{
363 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
364 return -1;
365 }
366
367 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
368 return buf_size;
369 }
370
371
372 retry:
373
374 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
375 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
376 }else
377 init_get_bits(&s->gb, buf, buf_size*8);
378 s->bitstream_buffer_size=0;
379
380 if (!s->context_initialized) {
381 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
382 return -1;
383 }
384
385 /* We need to set current_picture_ptr before reading the header,
386 * otherwise we cannot store anyting in there */
387 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
388 int i= ff_find_unused_picture(s, 0);
389 s->current_picture_ptr= &s->picture[i];
390 }
391
392 /* let's go :-) */
393 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
394 ret= ff_wmv2_decode_picture_header(s);
395 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
396 ret = msmpeg4_decode_picture_header(s);
397 } else if (s->h263_pred) {
398 if(s->avctx->extradata_size && s->picture_number==0){
399 GetBitContext gb;
400
401 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
402 ret = ff_mpeg4_decode_picture_header(s, &gb);
403 }
404 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
405 } else if (s->codec_id == CODEC_ID_H263I) {
406 ret = intel_h263_decode_picture_header(s);
407 } else if (s->h263_flv) {
408 ret = flv_h263_decode_picture_header(s);
409 } else {
410 ret = h263_decode_picture_header(s);
411 }
412
413 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
414
415 /* skip if the header was thrashed */
416 if (ret < 0){
417 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
418 return -1;
419 }
420
421 avctx->has_b_frames= !s->low_delay;
422
423 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
424 if(s->stream_codec_tag == AV_RL32("XVID") ||
425 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
426 s->codec_tag == AV_RL32("RMP4"))
427 s->xvid_build= -1;
428 #if 0
429 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
430 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
431 s->xvid_build= -1;
432 #endif
433 }
434
435 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
436 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
437 s->divx_version= 400; //divx 4
438 }
439
440 if(s->xvid_build && s->divx_version){
441 s->divx_version=
442 s->divx_build= 0;
443 }
444
445 if(s->workaround_bugs&FF_BUG_AUTODETECT){
446 if(s->codec_tag == AV_RL32("XVIX"))
447 s->workaround_bugs|= FF_BUG_XVID_ILACE;
448
449 if(s->codec_tag == AV_RL32("UMP4")){
450 s->workaround_bugs|= FF_BUG_UMP4;
451 }
452
453 if(s->divx_version>=500 && s->divx_build<1814){
454 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
455 }
456
457 if(s->divx_version>502 && s->divx_build<1814){
458 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
459 }
460
461 if(s->xvid_build && s->xvid_build<=3)
462 s->padding_bug_score= 256*256*256*64;
463
464 if(s->xvid_build && s->xvid_build<=1)
465 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
466
467 if(s->xvid_build && s->xvid_build<=12)
468 s->workaround_bugs|= FF_BUG_EDGE;
469
470 if(s->xvid_build && s->xvid_build<=32)
471 s->workaround_bugs|= FF_BUG_DC_CLIP;
472
473 #define SET_QPEL_FUNC(postfix1, postfix2) \
474 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
475 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
476 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
477
478 if(s->lavc_build && s->lavc_build<4653)
479 s->workaround_bugs|= FF_BUG_STD_QPEL;
480
481 if(s->lavc_build && s->lavc_build<4655)
482 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
483
484 if(s->lavc_build && s->lavc_build<4670){
485 s->workaround_bugs|= FF_BUG_EDGE;
486 }
487
488 if(s->lavc_build && s->lavc_build<=4712)
489 s->workaround_bugs|= FF_BUG_DC_CLIP;
490
491 if(s->divx_version)
492 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
493 //printf("padding_bug_score: %d\n", s->padding_bug_score);
494 if(s->divx_version==501 && s->divx_build==20020416)
495 s->padding_bug_score= 256*256*256*64;
496
497 if(s->divx_version && s->divx_version<500){
498 s->workaround_bugs|= FF_BUG_EDGE;
499 }
500
501 if(s->divx_version)
502 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
503 #if 0
504 if(s->divx_version==500)
505 s->padding_bug_score= 256*256*256*64;
506
507 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
508 * Let us hope this at least works.
509 */
510 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
511 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
512 s->workaround_bugs|= FF_BUG_NO_PADDING;
513
514 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
515 s->workaround_bugs|= FF_BUG_NO_PADDING;
516 #endif
517 }
518
519 if(s->workaround_bugs& FF_BUG_STD_QPEL){
520 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
521 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
522 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
523 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
524 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
525 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
526
527 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
528 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
529 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
530 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
531 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
532 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
533 }
534
535 if(avctx->debug & FF_DEBUG_BUGS)
536 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
537 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
538 s->divx_packed ? "p" : "");
539
540 #if 0 // dump bits per frame / qp / complexity
541 {
542 static FILE *f=NULL;
543 if(!f) f=fopen("rate_qp_cplx.txt", "w");
544 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
545 }
546 #endif
547
548 #if HAVE_MMX
549 if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
550 avctx->idct_algo= FF_IDCT_XVIDMMX;
551 avctx->coded_width= 0; // force reinit
552 // dsputil_init(&s->dsp, avctx);
553 s->picture_number=0;
554 }
555 #endif
556
557 /* After H263 & mpeg4 header decode we have the height, width,*/
558 /* and other parameters. So then we could init the picture */
559 /* FIXME: By the way H263 decoder is evolving it should have */
560 /* an H263EncContext */
561
562 if ( s->width != avctx->coded_width
563 || s->height != avctx->coded_height) {
564 /* H.263 could change picture size any time */
565 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
566 s->parse_context.buffer=0;
567 MPV_common_end(s);
568 s->parse_context= pc;
569 }
570 if (!s->context_initialized) {
571 avcodec_set_dimensions(avctx, s->width, s->height);
572
573 goto retry;
574 }
575
576 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
577 s->gob_index = ff_h263_get_gob_height(s);
578
579 // for hurry_up==5
580 s->current_picture.pict_type= s->pict_type;
581 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
582
583 /* skip B-frames if we don't have reference frames */
584 if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
585 /* skip b frames if we are in a hurry */
586 if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
587 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
588 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
589 || avctx->skip_frame >= AVDISCARD_ALL)
590 return get_consumed_bytes(s, buf_size);
591 /* skip everything if we are in a hurry>=5 */
592 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
593
594 if(s->next_p_frame_damaged){
595 if(s->pict_type==FF_B_TYPE)
596 return get_consumed_bytes(s, buf_size);
597 else
598 s->next_p_frame_damaged=0;
599 }
600
601 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
602 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
603 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
604 }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
605 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
606 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
607 }else{
608 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
609 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
610 }
611
612 if(MPV_frame_start(s, avctx) < 0)
613 return -1;
614
615 #ifdef DEBUG
616 av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
617 #endif
618
619 ff_er_frame_start(s);
620
621 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
622 //which is not available before MPV_frame_start()
623 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
624 ret = ff_wmv2_decode_secondary_picture_header(s);
625 if(ret<0) return ret;
626 if(ret==1) goto intrax8_decoded;
627 }
628
629 /* decode each macroblock */
630 s->mb_x=0;
631 s->mb_y=0;
632
633 decode_slice(s);
634 while(s->mb_y<s->mb_height){
635 if(s->msmpeg4_version){
636 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
637 break;
638 }else{
639 if(ff_h263_resync(s)<0)
640 break;
641 }
642
643 if(s->msmpeg4_version<4 && s->h263_pred)
644 ff_mpeg4_clean_buffers(s);
645
646 decode_slice(s);
647 }
648
649 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
650 if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
651 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
652 }
653
654 /* divx 5.01+ bistream reorder stuff */
655 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
656 int current_pos= get_bits_count(&s->gb)>>3;
657 int startcode_found=0;
658
659 if(buf_size - current_pos > 5){
660 int i;
661 for(i=current_pos; i<buf_size-3; i++){
662 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
663 startcode_found=1;
664 break;
665 }
666 }
667 }
668 if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
669 startcode_found=1;
670 current_pos=0;
671 }
672
673 if(startcode_found){
674 s->bitstream_buffer= av_fast_realloc(
675 s->bitstream_buffer,
676 &s->allocated_bitstream_buffer_size,
677 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
678 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
679 s->bitstream_buffer_size= buf_size - current_pos;
680 }
681 }
682
683 intrax8_decoded:
684 ff_er_frame_end(s);
685
686 MPV_frame_end(s);
687
688 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
689 assert(s->current_picture.pict_type == s->pict_type);
690 if (s->pict_type == FF_B_TYPE || s->low_delay) {
691 *pict= *(AVFrame*)s->current_picture_ptr;
692 } else if (s->last_picture_ptr != NULL) {
693 *pict= *(AVFrame*)s->last_picture_ptr;
694 }
695
696 if(s->last_picture_ptr || s->low_delay){
697 *data_size = sizeof(AVFrame);
698 ff_print_debug_info(s, pict);
699 }
700
701 /* Return the Picture timestamp as the frame number */
702 /* we subtract 1 because it is added on utils.c */
703 avctx->frame_number = s->picture_number - 1;
704
705 #ifdef PRINT_FRAME_TIME
706 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
707 #endif
708
709 return get_consumed_bytes(s, buf_size);
710 }
711
712 AVCodec mpeg4_decoder = {
713 "mpeg4",
714 CODEC_TYPE_VIDEO,
715 CODEC_ID_MPEG4,
716 sizeof(MpegEncContext),
717 ff_h263_decode_init,
718 NULL,
719 ff_h263_decode_end,
720 ff_h263_decode_frame,
721 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
722 .flush= ff_mpeg_flush,
723 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
724 };
725
726 AVCodec h263_decoder = {
727 "h263",
728 CODEC_TYPE_VIDEO,
729 CODEC_ID_H263,
730 sizeof(MpegEncContext),
731 ff_h263_decode_init,
732 NULL,
733 ff_h263_decode_end,
734 ff_h263_decode_frame,
735 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
736 .flush= ff_mpeg_flush,
737 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998"),
738 };
739
740 AVCodec msmpeg4v1_decoder = {
741 "msmpeg4v1",
742 CODEC_TYPE_VIDEO,
743 CODEC_ID_MSMPEG4V1,
744 sizeof(MpegEncContext),
745 ff_h263_decode_init,
746 NULL,
747 ff_h263_decode_end,
748 ff_h263_decode_frame,
749 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
750 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
751 };
752
753 AVCodec msmpeg4v2_decoder = {
754 "msmpeg4v2",
755 CODEC_TYPE_VIDEO,
756 CODEC_ID_MSMPEG4V2,
757 sizeof(MpegEncContext),
758 ff_h263_decode_init,
759 NULL,
760 ff_h263_decode_end,
761 ff_h263_decode_frame,
762 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
763 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
764 };
765
766 AVCodec msmpeg4v3_decoder = {
767 "msmpeg4",
768 CODEC_TYPE_VIDEO,
769 CODEC_ID_MSMPEG4V3,
770 sizeof(MpegEncContext),
771 ff_h263_decode_init,
772 NULL,
773 ff_h263_decode_end,
774 ff_h263_decode_frame,
775 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
776 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
777 };
778
779 AVCodec wmv1_decoder = {
780 "wmv1",
781 CODEC_TYPE_VIDEO,
782 CODEC_ID_WMV1,
783 sizeof(MpegEncContext),
784 ff_h263_decode_init,
785 NULL,
786 ff_h263_decode_end,
787 ff_h263_decode_frame,
788 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
789 .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
790 };
791
792 AVCodec h263i_decoder = {
793 "h263i",
794 CODEC_TYPE_VIDEO,
795 CODEC_ID_H263I,
796 sizeof(MpegEncContext),
797 ff_h263_decode_init,
798 NULL,
799 ff_h263_decode_end,
800 ff_h263_decode_frame,
801 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
802 .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
803 };
804
805 AVCodec flv_decoder = {
806 "flv",
807 CODEC_TYPE_VIDEO,
808 CODEC_ID_FLV1,
809 sizeof(MpegEncContext),
810 ff_h263_decode_init,
811 NULL,
812 ff_h263_decode_end,
813 ff_h263_decode_frame,
814 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
815 .long_name= NULL_IF_CONFIG_SMALL("Flash Video"),
816 };