More approved hunks for VAAPI & our new and cleaner hwaccel API.
[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 "internal.h"
29 #include "avcodec.h"
30 #include "dsputil.h"
31 #include "mpegvideo.h"
32 #include "h263_parser.h"
33 #include "mpeg4video_parser.h"
34 #include "msmpeg4.h"
35
36 //#define DEBUG
37 //#define PRINT_FRAME_TIME
38
39 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
40 {
41 MpegEncContext *s = avctx->priv_data;
42
43 s->avctx = avctx;
44 s->out_format = FMT_H263;
45
46 s->width = avctx->coded_width;
47 s->height = avctx->coded_height;
48 s->workaround_bugs= avctx->workaround_bugs;
49
50 // set defaults
51 MPV_decode_defaults(s);
52 s->quant_precision=5;
53 s->decode_mb= ff_h263_decode_mb;
54 s->low_delay= 1;
55 avctx->pix_fmt= PIX_FMT_YUV420P;
56 s->unrestricted_mv= 1;
57
58 /* select sub codec */
59 switch(avctx->codec->id) {
60 case CODEC_ID_H263:
61 s->unrestricted_mv= 0;
62 break;
63 case CODEC_ID_MPEG4:
64 s->decode_mb= ff_mpeg4_decode_mb;
65 s->time_increment_bits = 4; /* default value for broken headers */
66 s->h263_pred = 1;
67 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
68 break;
69 case CODEC_ID_MSMPEG4V1:
70 s->h263_msmpeg4 = 1;
71 s->h263_pred = 1;
72 s->msmpeg4_version=1;
73 break;
74 case CODEC_ID_MSMPEG4V2:
75 s->h263_msmpeg4 = 1;
76 s->h263_pred = 1;
77 s->msmpeg4_version=2;
78 break;
79 case CODEC_ID_MSMPEG4V3:
80 s->h263_msmpeg4 = 1;
81 s->h263_pred = 1;
82 s->msmpeg4_version=3;
83 break;
84 case CODEC_ID_WMV1:
85 s->h263_msmpeg4 = 1;
86 s->h263_pred = 1;
87 s->msmpeg4_version=4;
88 break;
89 case CODEC_ID_WMV2:
90 s->h263_msmpeg4 = 1;
91 s->h263_pred = 1;
92 s->msmpeg4_version=5;
93 break;
94 case CODEC_ID_VC1:
95 case CODEC_ID_WMV3:
96 s->h263_msmpeg4 = 1;
97 s->h263_pred = 1;
98 s->msmpeg4_version=6;
99 break;
100 case CODEC_ID_H263I:
101 break;
102 case CODEC_ID_FLV1:
103 s->h263_flv = 1;
104 break;
105 default:
106 return -1;
107 }
108 s->codec_id= avctx->codec->id;
109
110 /* for h263, we allocate the images after having read the header */
111 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
112 if (MPV_common_init(s) < 0)
113 return -1;
114
115 if (CONFIG_MSMPEG4_DECODER && s->h263_msmpeg4)
116 ff_msmpeg4_decode_init(s);
117 else
118 h263_decode_init_vlc(s);
119
120 return 0;
121 }
122
123 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
124 {
125 MpegEncContext *s = avctx->priv_data;
126
127 MPV_common_end(s);
128 return 0;
129 }
130
131 /**
132 * returns the number of bytes consumed for building the current frame
133 */
134 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
135 int pos= (get_bits_count(&s->gb)+7)>>3;
136
137 if(s->divx_packed){
138 //we would have to scan through the whole buf to handle the weird reordering ...
139 return buf_size;
140 }else if(s->flags&CODEC_FLAG_TRUNCATED){
141 pos -= s->parse_context.last_index;
142 if(pos<0) pos=0; // padding is not really read so this might be -1
143 return pos;
144 }else{
145 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
146 if(pos+10>buf_size) pos=buf_size; // oops ;)
147
148 return pos;
149 }
150 }
151
152 static int decode_slice(MpegEncContext *s){
153 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
154 const int mb_size= 16>>s->avctx->lowres;
155 s->last_resync_gb= s->gb;
156 s->first_slice_line= 1;
157
158 s->resync_mb_x= s->mb_x;
159 s->resync_mb_y= s->mb_y;
160
161 ff_set_qscale(s, s->qscale);
162
163 if (s->avctx->hwaccel)
164 return 0;
165
166 if(s->partitioned_frame){
167 const int qscale= s->qscale;
168
169 if(s->codec_id==CODEC_ID_MPEG4){
170 if(ff_mpeg4_decode_partitions(s) < 0)
171 return -1;
172 }
173
174 /* restore variables which were modified */
175 s->first_slice_line=1;
176 s->mb_x= s->resync_mb_x;
177 s->mb_y= s->resync_mb_y;
178 ff_set_qscale(s, qscale);
179 }
180
181 for(; s->mb_y < s->mb_height; s->mb_y++) {
182 /* per-row end of slice checks */
183 if(s->msmpeg4_version){
184 if(s->resync_mb_y + s->slice_height == s->mb_y){
185 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);
186
187 return 0;
188 }
189 }
190
191 if(s->msmpeg4_version==1){
192 s->last_dc[0]=
193 s->last_dc[1]=
194 s->last_dc[2]= 128;
195 }
196
197 ff_init_block_index(s);
198 for(; s->mb_x < s->mb_width; s->mb_x++) {
199 int ret;
200
201 ff_update_block_index(s);
202
203 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
204 s->first_slice_line=0;
205 }
206
207 /* DCT & quantize */
208
209 s->mv_dir = MV_DIR_FORWARD;
210 s->mv_type = MV_TYPE_16X16;
211 // s->mb_skipped = 0;
212 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
213 ret= s->decode_mb(s, s->block);
214
215 if (s->pict_type!=FF_B_TYPE)
216 ff_h263_update_motion_val(s);
217
218 if(ret<0){
219 const int xy= s->mb_x + s->mb_y*s->mb_stride;
220 if(ret==SLICE_END){
221 MPV_decode_mb(s, s->block);
222 if(s->loop_filter)
223 ff_h263_loop_filter(s);
224
225 //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));
226 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);
227
228 s->padding_bug_score--;
229
230 if(++s->mb_x >= s->mb_width){
231 s->mb_x=0;
232 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
233 s->mb_y++;
234 }
235 return 0;
236 }else if(ret==SLICE_NOEND){
237 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
238 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);
239 return -1;
240 }
241 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
242 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);
243
244 return -1;
245 }
246
247 MPV_decode_mb(s, s->block);
248 if(s->loop_filter)
249 ff_h263_loop_filter(s);
250 }
251
252 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
253
254 s->mb_x= 0;
255 }
256
257 assert(s->mb_x==0 && s->mb_y==s->mb_height);
258
259 /* try to detect the padding bug */
260 if( s->codec_id==CODEC_ID_MPEG4
261 && (s->workaround_bugs&FF_BUG_AUTODETECT)
262 && s->gb.size_in_bits - get_bits_count(&s->gb) >=0
263 && s->gb.size_in_bits - get_bits_count(&s->gb) < 48
264 // && !s->resync_marker
265 && !s->data_partitioning){
266
267 const int bits_count= get_bits_count(&s->gb);
268 const int bits_left = s->gb.size_in_bits - bits_count;
269
270 if(bits_left==0){
271 s->padding_bug_score+=16;
272 } else if(bits_left != 1){
273 int v= show_bits(&s->gb, 8);
274 v|= 0x7F >> (7-(bits_count&7));
275
276 if(v==0x7F && bits_left<=8)
277 s->padding_bug_score--;
278 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
279 s->padding_bug_score+= 4;
280 else
281 s->padding_bug_score++;
282 }
283 }
284
285 if(s->workaround_bugs&FF_BUG_AUTODETECT){
286 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
287 s->workaround_bugs |= FF_BUG_NO_PADDING;
288 else
289 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
290 }
291
292 // handle formats which don't have unique end markers
293 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
294 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
295 int max_extra=7;
296
297 /* no markers in M$ crap */
298 if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
299 max_extra+= 17;
300
301 /* buggy padding but the frame should still end approximately at the bitstream end */
302 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
303 max_extra+= 48;
304 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
305 max_extra+= 256*256*256*64;
306
307 if(left>max_extra){
308 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
309 }
310 else if(left<0){
311 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
312 }else
313 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);
314
315 return 0;
316 }
317
318 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
319 s->gb.size_in_bits - get_bits_count(&s->gb),
320 show_bits(&s->gb, 24), s->padding_bug_score);
321
322 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);
323
324 return -1;
325 }
326
327 int ff_h263_decode_frame(AVCodecContext *avctx,
328 void *data, int *data_size,
329 const uint8_t *buf, int buf_size)
330 {
331 MpegEncContext *s = avctx->priv_data;
332 int ret;
333 AVFrame *pict = data;
334
335 #ifdef PRINT_FRAME_TIME
336 uint64_t time= rdtsc();
337 #endif
338 #ifdef DEBUG
339 av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
340 if(buf_size>0)
341 av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
342 #endif
343 s->flags= avctx->flags;
344 s->flags2= avctx->flags2;
345
346 /* no supplementary picture */
347 if (buf_size == 0) {
348 /* special case for last picture */
349 if (s->low_delay==0 && s->next_picture_ptr) {
350 *pict= *(AVFrame*)s->next_picture_ptr;
351 s->next_picture_ptr= NULL;
352
353 *data_size = sizeof(AVFrame);
354 }
355
356 return 0;
357 }
358
359 if(s->flags&CODEC_FLAG_TRUNCATED){
360 int next;
361
362 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
363 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
364 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
365 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
366 }else{
367 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
368 return -1;
369 }
370
371 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
372 return buf_size;
373 }
374
375
376 retry:
377
378 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
379 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
380 }else
381 init_get_bits(&s->gb, buf, buf_size*8);
382 s->bitstream_buffer_size=0;
383
384 if (!s->context_initialized) {
385 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
386 return -1;
387 }
388
389 /* We need to set current_picture_ptr before reading the header,
390 * otherwise we cannot store anyting in there */
391 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
392 int i= ff_find_unused_picture(s, 0);
393 s->current_picture_ptr= &s->picture[i];
394 }
395
396 /* let's go :-) */
397 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
398 ret= ff_wmv2_decode_picture_header(s);
399 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
400 ret = msmpeg4_decode_picture_header(s);
401 } else if (s->h263_pred) {
402 if(s->avctx->extradata_size && s->picture_number==0){
403 GetBitContext gb;
404
405 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
406 ret = ff_mpeg4_decode_picture_header(s, &gb);
407 }
408 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
409 } else if (s->codec_id == CODEC_ID_H263I) {
410 ret = intel_h263_decode_picture_header(s);
411 } else if (s->h263_flv) {
412 ret = flv_h263_decode_picture_header(s);
413 } else {
414 ret = h263_decode_picture_header(s);
415 }
416
417 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
418
419 /* skip if the header was thrashed */
420 if (ret < 0){
421 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
422 return -1;
423 }
424
425 avctx->has_b_frames= !s->low_delay;
426
427 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
428 if(s->stream_codec_tag == AV_RL32("XVID") ||
429 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
430 s->codec_tag == AV_RL32("RMP4"))
431 s->xvid_build= -1;
432 #if 0
433 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
434 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
435 s->xvid_build= -1;
436 #endif
437 }
438
439 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
440 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
441 s->divx_version= 400; //divx 4
442 }
443
444 if(s->xvid_build && s->divx_version){
445 s->divx_version=
446 s->divx_build= 0;
447 }
448
449 if(s->workaround_bugs&FF_BUG_AUTODETECT){
450 if(s->codec_tag == AV_RL32("XVIX"))
451 s->workaround_bugs|= FF_BUG_XVID_ILACE;
452
453 if(s->codec_tag == AV_RL32("UMP4")){
454 s->workaround_bugs|= FF_BUG_UMP4;
455 }
456
457 if(s->divx_version>=500 && s->divx_build<1814){
458 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
459 }
460
461 if(s->divx_version>502 && s->divx_build<1814){
462 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
463 }
464
465 if(s->xvid_build && s->xvid_build<=3)
466 s->padding_bug_score= 256*256*256*64;
467
468 if(s->xvid_build && s->xvid_build<=1)
469 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
470
471 if(s->xvid_build && s->xvid_build<=12)
472 s->workaround_bugs|= FF_BUG_EDGE;
473
474 if(s->xvid_build && s->xvid_build<=32)
475 s->workaround_bugs|= FF_BUG_DC_CLIP;
476
477 #define SET_QPEL_FUNC(postfix1, postfix2) \
478 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
479 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
480 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
481
482 if(s->lavc_build && s->lavc_build<4653)
483 s->workaround_bugs|= FF_BUG_STD_QPEL;
484
485 if(s->lavc_build && s->lavc_build<4655)
486 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
487
488 if(s->lavc_build && s->lavc_build<4670){
489 s->workaround_bugs|= FF_BUG_EDGE;
490 }
491
492 if(s->lavc_build && s->lavc_build<=4712)
493 s->workaround_bugs|= FF_BUG_DC_CLIP;
494
495 if(s->divx_version)
496 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
497 //printf("padding_bug_score: %d\n", s->padding_bug_score);
498 if(s->divx_version==501 && s->divx_build==20020416)
499 s->padding_bug_score= 256*256*256*64;
500
501 if(s->divx_version && s->divx_version<500){
502 s->workaround_bugs|= FF_BUG_EDGE;
503 }
504
505 if(s->divx_version)
506 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
507 #if 0
508 if(s->divx_version==500)
509 s->padding_bug_score= 256*256*256*64;
510
511 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
512 * Let us hope this at least works.
513 */
514 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
515 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
516 s->workaround_bugs|= FF_BUG_NO_PADDING;
517
518 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
519 s->workaround_bugs|= FF_BUG_NO_PADDING;
520 #endif
521 }
522
523 if(s->workaround_bugs& FF_BUG_STD_QPEL){
524 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
525 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
526 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
527 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
528 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
529 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
530
531 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
532 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
533 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
534 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
535 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
536 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
537 }
538
539 if(avctx->debug & FF_DEBUG_BUGS)
540 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
541 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
542 s->divx_packed ? "p" : "");
543
544 #if 0 // dump bits per frame / qp / complexity
545 {
546 static FILE *f=NULL;
547 if(!f) f=fopen("rate_qp_cplx.txt", "w");
548 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
549 }
550 #endif
551
552 #if HAVE_MMX
553 if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
554 avctx->idct_algo= FF_IDCT_XVIDMMX;
555 avctx->coded_width= 0; // force reinit
556 // dsputil_init(&s->dsp, avctx);
557 s->picture_number=0;
558 }
559 #endif
560
561 /* After H263 & mpeg4 header decode we have the height, width,*/
562 /* and other parameters. So then we could init the picture */
563 /* FIXME: By the way H263 decoder is evolving it should have */
564 /* an H263EncContext */
565
566 if ( s->width != avctx->coded_width
567 || s->height != avctx->coded_height) {
568 /* H.263 could change picture size any time */
569 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
570 s->parse_context.buffer=0;
571 MPV_common_end(s);
572 s->parse_context= pc;
573 }
574 if (!s->context_initialized) {
575 avcodec_set_dimensions(avctx, s->width, s->height);
576
577 goto retry;
578 }
579
580 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
581 s->gob_index = ff_h263_get_gob_height(s);
582
583 // for hurry_up==5
584 s->current_picture.pict_type= s->pict_type;
585 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
586
587 /* skip B-frames if we don't have reference frames */
588 if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
589 /* skip b frames if we are in a hurry */
590 if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
591 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
592 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
593 || avctx->skip_frame >= AVDISCARD_ALL)
594 return get_consumed_bytes(s, buf_size);
595 /* skip everything if we are in a hurry>=5 */
596 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
597
598 if(s->next_p_frame_damaged){
599 if(s->pict_type==FF_B_TYPE)
600 return get_consumed_bytes(s, buf_size);
601 else
602 s->next_p_frame_damaged=0;
603 }
604
605 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
606 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
607 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
608 }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
609 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
610 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
611 }else{
612 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
613 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
614 }
615
616 if(MPV_frame_start(s, avctx) < 0)
617 return -1;
618
619 #ifdef DEBUG
620 av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
621 #endif
622
623 ff_er_frame_start(s);
624
625 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
626 //which is not available before MPV_frame_start()
627 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
628 ret = ff_wmv2_decode_secondary_picture_header(s);
629 if(ret<0) return ret;
630 if(ret==1) goto intrax8_decoded;
631 }
632
633 /* decode each macroblock */
634 s->mb_x=0;
635 s->mb_y=0;
636
637 decode_slice(s);
638 while(s->mb_y<s->mb_height){
639 if(s->msmpeg4_version){
640 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)
641 break;
642 }else{
643 if(ff_h263_resync(s)<0)
644 break;
645 }
646
647 if(s->msmpeg4_version<4 && s->h263_pred)
648 ff_mpeg4_clean_buffers(s);
649
650 decode_slice(s);
651 }
652
653 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
654 if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
655 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
656 }
657
658 /* divx 5.01+ bistream reorder stuff */
659 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
660 int current_pos= get_bits_count(&s->gb)>>3;
661 int startcode_found=0;
662
663 if(buf_size - current_pos > 5){
664 int i;
665 for(i=current_pos; i<buf_size-3; i++){
666 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
667 startcode_found=1;
668 break;
669 }
670 }
671 }
672 if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
673 startcode_found=1;
674 current_pos=0;
675 }
676
677 if(startcode_found){
678 s->bitstream_buffer= av_fast_realloc(
679 s->bitstream_buffer,
680 &s->allocated_bitstream_buffer_size,
681 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
682 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
683 s->bitstream_buffer_size= buf_size - current_pos;
684 }
685 }
686
687 intrax8_decoded:
688 ff_er_frame_end(s);
689
690 MPV_frame_end(s);
691
692 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
693 assert(s->current_picture.pict_type == s->pict_type);
694 if (s->pict_type == FF_B_TYPE || s->low_delay) {
695 *pict= *(AVFrame*)s->current_picture_ptr;
696 } else if (s->last_picture_ptr != NULL) {
697 *pict= *(AVFrame*)s->last_picture_ptr;
698 }
699
700 if(s->last_picture_ptr || s->low_delay){
701 *data_size = sizeof(AVFrame);
702 ff_print_debug_info(s, pict);
703 }
704
705 /* Return the Picture timestamp as the frame number */
706 /* we subtract 1 because it is added on utils.c */
707 avctx->frame_number = s->picture_number - 1;
708
709 #ifdef PRINT_FRAME_TIME
710 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
711 #endif
712
713 return get_consumed_bytes(s, buf_size);
714 }
715
716 AVCodec mpeg4_decoder = {
717 "mpeg4",
718 CODEC_TYPE_VIDEO,
719 CODEC_ID_MPEG4,
720 sizeof(MpegEncContext),
721 ff_h263_decode_init,
722 NULL,
723 ff_h263_decode_end,
724 ff_h263_decode_frame,
725 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
726 .flush= ff_mpeg_flush,
727 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
728 };
729
730 AVCodec h263_decoder = {
731 "h263",
732 CODEC_TYPE_VIDEO,
733 CODEC_ID_H263,
734 sizeof(MpegEncContext),
735 ff_h263_decode_init,
736 NULL,
737 ff_h263_decode_end,
738 ff_h263_decode_frame,
739 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
740 .flush= ff_mpeg_flush,
741 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998"),
742 };
743
744 AVCodec msmpeg4v1_decoder = {
745 "msmpeg4v1",
746 CODEC_TYPE_VIDEO,
747 CODEC_ID_MSMPEG4V1,
748 sizeof(MpegEncContext),
749 ff_h263_decode_init,
750 NULL,
751 ff_h263_decode_end,
752 ff_h263_decode_frame,
753 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
754 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
755 };
756
757 AVCodec msmpeg4v2_decoder = {
758 "msmpeg4v2",
759 CODEC_TYPE_VIDEO,
760 CODEC_ID_MSMPEG4V2,
761 sizeof(MpegEncContext),
762 ff_h263_decode_init,
763 NULL,
764 ff_h263_decode_end,
765 ff_h263_decode_frame,
766 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
767 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
768 };
769
770 AVCodec msmpeg4v3_decoder = {
771 "msmpeg4",
772 CODEC_TYPE_VIDEO,
773 CODEC_ID_MSMPEG4V3,
774 sizeof(MpegEncContext),
775 ff_h263_decode_init,
776 NULL,
777 ff_h263_decode_end,
778 ff_h263_decode_frame,
779 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
780 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
781 };
782
783 AVCodec wmv1_decoder = {
784 "wmv1",
785 CODEC_TYPE_VIDEO,
786 CODEC_ID_WMV1,
787 sizeof(MpegEncContext),
788 ff_h263_decode_init,
789 NULL,
790 ff_h263_decode_end,
791 ff_h263_decode_frame,
792 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
793 .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
794 };
795
796 AVCodec h263i_decoder = {
797 "h263i",
798 CODEC_TYPE_VIDEO,
799 CODEC_ID_H263I,
800 sizeof(MpegEncContext),
801 ff_h263_decode_init,
802 NULL,
803 ff_h263_decode_end,
804 ff_h263_decode_frame,
805 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
806 .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
807 };
808
809 AVCodec flv_decoder = {
810 "flv",
811 CODEC_TYPE_VIDEO,
812 CODEC_ID_FLV1,
813 sizeof(MpegEncContext),
814 ff_h263_decode_init,
815 NULL,
816 ff_h263_decode_end,
817 ff_h263_decode_frame,
818 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
819 .long_name= NULL_IF_CONFIG_SMALL("Flash Video"),
820 };