5f35bf8852b7e68265806e6ce0b6715660e43d0e
[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 Libav.
7 *
8 * Libav 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 * Libav 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 Libav; 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 #include "libavutil/cpu.h"
29 #include "internal.h"
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "mpegvideo.h"
33 #include "h263.h"
34 #include "h263_parser.h"
35 #include "mpeg4video_parser.h"
36 #include "msmpeg4.h"
37 #include "vdpau_internal.h"
38 #include "thread.h"
39 #include "flv.h"
40 #include "mpeg4video.h"
41
42 //#define DEBUG
43 //#define PRINT_FRAME_TIME
44
45 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
46 {
47 MpegEncContext *s = avctx->priv_data;
48
49 s->avctx = avctx;
50 s->out_format = FMT_H263;
51
52 s->width = avctx->coded_width;
53 s->height = avctx->coded_height;
54 s->workaround_bugs= avctx->workaround_bugs;
55
56 // set defaults
57 ff_MPV_decode_defaults(s);
58 s->quant_precision=5;
59 s->decode_mb= ff_h263_decode_mb;
60 s->low_delay= 1;
61 avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
62 s->unrestricted_mv= 1;
63
64 /* select sub codec */
65 switch(avctx->codec->id) {
66 case CODEC_ID_H263:
67 s->unrestricted_mv= 0;
68 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
69 break;
70 case CODEC_ID_MPEG4:
71 break;
72 case CODEC_ID_MSMPEG4V1:
73 s->h263_pred = 1;
74 s->msmpeg4_version=1;
75 break;
76 case CODEC_ID_MSMPEG4V2:
77 s->h263_pred = 1;
78 s->msmpeg4_version=2;
79 break;
80 case CODEC_ID_MSMPEG4V3:
81 s->h263_pred = 1;
82 s->msmpeg4_version=3;
83 break;
84 case CODEC_ID_WMV1:
85 s->h263_pred = 1;
86 s->msmpeg4_version=4;
87 break;
88 case CODEC_ID_WMV2:
89 s->h263_pred = 1;
90 s->msmpeg4_version=5;
91 break;
92 case CODEC_ID_VC1:
93 case CODEC_ID_WMV3:
94 case CODEC_ID_VC1IMAGE:
95 case CODEC_ID_WMV3IMAGE:
96 s->h263_pred = 1;
97 s->msmpeg4_version=6;
98 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
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 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
110
111 /* for h263, we allocate the images after having read the header */
112 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
113 if (ff_MPV_common_init(s) < 0)
114 return -1;
115
116 ff_h263_decode_init_vlc(s);
117
118 return 0;
119 }
120
121 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
122 {
123 MpegEncContext *s = avctx->priv_data;
124
125 ff_MPV_common_end(s);
126 return 0;
127 }
128
129 /**
130 * Return the number of bytes consumed for building the current frame.
131 */
132 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
133 int pos= (get_bits_count(&s->gb)+7)>>3;
134
135 if(s->divx_packed || s->avctx->hwaccel){
136 //we would have to scan through the whole buf to handle the weird reordering ...
137 return buf_size;
138 }else if(s->flags&CODEC_FLAG_TRUNCATED){
139 pos -= s->parse_context.last_index;
140 if(pos<0) pos=0; // padding is not really read so this might be -1
141 return pos;
142 }else{
143 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
144 if(pos+10>buf_size) pos=buf_size; // oops ;)
145
146 return pos;
147 }
148 }
149
150 static int decode_slice(MpegEncContext *s){
151 const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
152 const int mb_size= 16>>s->avctx->lowres;
153 s->last_resync_gb= s->gb;
154 s->first_slice_line= 1;
155
156 s->resync_mb_x= s->mb_x;
157 s->resync_mb_y= s->mb_y;
158
159 ff_set_qscale(s, s->qscale);
160
161 if (s->avctx->hwaccel) {
162 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
163 const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
164 skip_bits_long(&s->gb, 8*(end - start));
165 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
166 }
167
168 if(s->partitioned_frame){
169 const int qscale= s->qscale;
170
171 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
172 if(ff_mpeg4_decode_partitions(s) < 0)
173 return -1;
174 }
175
176 /* restore variables which were modified */
177 s->first_slice_line=1;
178 s->mb_x= s->resync_mb_x;
179 s->mb_y= s->resync_mb_y;
180 ff_set_qscale(s, qscale);
181 }
182
183 for(; s->mb_y < s->mb_height; s->mb_y++) {
184 /* per-row end of slice checks */
185 if(s->msmpeg4_version){
186 if(s->resync_mb_y + s->slice_height == s->mb_y){
187 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
188
189 return 0;
190 }
191 }
192
193 if(s->msmpeg4_version==1){
194 s->last_dc[0]=
195 s->last_dc[1]=
196 s->last_dc[2]= 128;
197 }
198
199 ff_init_block_index(s);
200 for(; s->mb_x < s->mb_width; s->mb_x++) {
201 int ret;
202
203 ff_update_block_index(s);
204
205 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
206 s->first_slice_line=0;
207 }
208
209 /* DCT & quantize */
210
211 s->mv_dir = MV_DIR_FORWARD;
212 s->mv_type = MV_TYPE_16X16;
213 // s->mb_skipped = 0;
214 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
215 ret= s->decode_mb(s, s->block);
216
217 if (s->pict_type!=AV_PICTURE_TYPE_B)
218 ff_h263_update_motion_val(s);
219
220 if(ret<0){
221 const int xy= s->mb_x + s->mb_y*s->mb_stride;
222 if(ret==SLICE_END){
223 ff_MPV_decode_mb(s, s->block);
224 if(s->loop_filter)
225 ff_h263_loop_filter(s);
226
227 //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));
228 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
229
230 s->padding_bug_score--;
231
232 if(++s->mb_x >= s->mb_width){
233 s->mb_x=0;
234 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
235 ff_MPV_report_decode_progress(s);
236 s->mb_y++;
237 }
238 return 0;
239 }else if(ret==SLICE_NOEND){
240 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
241 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
242 return -1;
243 }
244 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
245 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
246
247 return -1;
248 }
249
250 ff_MPV_decode_mb(s, s->block);
251 if(s->loop_filter)
252 ff_h263_loop_filter(s);
253 }
254
255 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
256 ff_MPV_report_decode_progress(s);
257
258 s->mb_x= 0;
259 }
260
261 assert(s->mb_x==0 && s->mb_y==s->mb_height);
262
263 if(s->codec_id==CODEC_ID_MPEG4
264 && (s->workaround_bugs&FF_BUG_AUTODETECT)
265 && get_bits_left(&s->gb) >= 48
266 && show_bits(&s->gb, 24)==0x4010
267 && !s->data_partitioning)
268 s->padding_bug_score+=32;
269
270 /* try to detect the padding bug */
271 if( s->codec_id==CODEC_ID_MPEG4
272 && (s->workaround_bugs&FF_BUG_AUTODETECT)
273 && get_bits_left(&s->gb) >=0
274 && get_bits_left(&s->gb) < 48
275 // && !s->resync_marker
276 && !s->data_partitioning){
277
278 const int bits_count= get_bits_count(&s->gb);
279 const int bits_left = s->gb.size_in_bits - bits_count;
280
281 if(bits_left==0){
282 s->padding_bug_score+=16;
283 } else if(bits_left != 1){
284 int v= show_bits(&s->gb, 8);
285 v|= 0x7F >> (7-(bits_count&7));
286
287 if(v==0x7F && bits_left<=8)
288 s->padding_bug_score--;
289 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
290 s->padding_bug_score+= 4;
291 else
292 s->padding_bug_score++;
293 }
294 }
295
296 if(s->workaround_bugs&FF_BUG_AUTODETECT){
297 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
298 s->workaround_bugs |= FF_BUG_NO_PADDING;
299 else
300 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
301 }
302
303 // handle formats which don't have unique end markers
304 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
305 int left= get_bits_left(&s->gb);
306 int max_extra=7;
307
308 /* no markers in M$ crap */
309 if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
310 max_extra+= 17;
311
312 /* buggy padding but the frame should still end approximately at the bitstream end */
313 if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&AV_EF_BUFFER))
314 max_extra+= 48;
315 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
316 max_extra+= 256*256*256*64;
317
318 if(left>max_extra){
319 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
320 }
321 else if(left<0){
322 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
323 }else
324 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
325
326 return 0;
327 }
328
329 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
330 get_bits_left(&s->gb),
331 show_bits(&s->gb, 24), s->padding_bug_score);
332
333 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
334
335 return -1;
336 }
337
338 int ff_h263_decode_frame(AVCodecContext *avctx,
339 void *data, int *data_size,
340 AVPacket *avpkt)
341 {
342 const uint8_t *buf = avpkt->data;
343 int buf_size = avpkt->size;
344 MpegEncContext *s = avctx->priv_data;
345 int ret;
346 AVFrame *pict = data;
347
348 #ifdef PRINT_FRAME_TIME
349 uint64_t time= rdtsc();
350 #endif
351 s->flags= avctx->flags;
352 s->flags2= avctx->flags2;
353
354 /* no supplementary picture */
355 if (buf_size == 0) {
356 /* special case for last picture */
357 if (s->low_delay==0 && s->next_picture_ptr) {
358 *pict = s->next_picture_ptr->f;
359 s->next_picture_ptr= NULL;
360
361 *data_size = sizeof(AVFrame);
362 }
363
364 return 0;
365 }
366
367 if(s->flags&CODEC_FLAG_TRUNCATED){
368 int next;
369
370 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
371 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
372 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
373 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
374 }else{
375 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
376 return -1;
377 }
378
379 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
380 return buf_size;
381 }
382
383
384 retry:
385
386 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
387 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
388 }else
389 init_get_bits(&s->gb, buf, buf_size*8);
390 s->bitstream_buffer_size=0;
391
392 if (!s->context_initialized) {
393 if (ff_MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
394 return -1;
395 }
396
397 /* We need to set current_picture_ptr before reading the header,
398 * otherwise we cannot store anyting in there */
399 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
400 int i= ff_find_unused_picture(s, 0);
401 if (i < 0)
402 return i;
403 s->current_picture_ptr= &s->picture[i];
404 }
405
406 /* let's go :-) */
407 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
408 ret= ff_wmv2_decode_picture_header(s);
409 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
410 ret = ff_msmpeg4_decode_picture_header(s);
411 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
412 if(s->avctx->extradata_size && s->picture_number==0){
413 GetBitContext gb;
414
415 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
416 ret = ff_mpeg4_decode_picture_header(s, &gb);
417 }
418 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
419 } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
420 ret = ff_intel_h263_decode_picture_header(s);
421 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
422 ret = ff_flv_decode_picture_header(s);
423 } else {
424 ret = ff_h263_decode_picture_header(s);
425 }
426
427 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
428
429 /* skip if the header was thrashed */
430 if (ret < 0){
431 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
432 return -1;
433 }
434
435 avctx->has_b_frames= !s->low_delay;
436
437 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
438 if(s->stream_codec_tag == AV_RL32("XVID") ||
439 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
440 s->codec_tag == AV_RL32("RMP4") ||
441 s->codec_tag == AV_RL32("SIPP")
442 )
443 s->xvid_build= 0;
444 #if 0
445 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
446 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
447 s->xvid_build= 0;
448 #endif
449 }
450
451 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
452 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
453 s->divx_version= 400; //divx 4
454 }
455
456 if(s->xvid_build>=0 && s->divx_version>=0){
457 s->divx_version=
458 s->divx_build= -1;
459 }
460
461 if(s->workaround_bugs&FF_BUG_AUTODETECT){
462 if(s->codec_tag == AV_RL32("XVIX"))
463 s->workaround_bugs|= FF_BUG_XVID_ILACE;
464
465 if(s->codec_tag == AV_RL32("UMP4")){
466 s->workaround_bugs|= FF_BUG_UMP4;
467 }
468
469 if(s->divx_version>=500 && s->divx_build<1814){
470 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
471 }
472
473 if(s->divx_version>502 && s->divx_build<1814){
474 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
475 }
476
477 if(s->xvid_build<=3U)
478 s->padding_bug_score= 256*256*256*64;
479
480 if(s->xvid_build<=1U)
481 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
482
483 if(s->xvid_build<=12U)
484 s->workaround_bugs|= FF_BUG_EDGE;
485
486 if(s->xvid_build<=32U)
487 s->workaround_bugs|= FF_BUG_DC_CLIP;
488
489 #define SET_QPEL_FUNC(postfix1, postfix2) \
490 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
491 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
492 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
493
494 if(s->lavc_build<4653U)
495 s->workaround_bugs|= FF_BUG_STD_QPEL;
496
497 if(s->lavc_build<4655U)
498 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
499
500 if(s->lavc_build<4670U){
501 s->workaround_bugs|= FF_BUG_EDGE;
502 }
503
504 if(s->lavc_build<=4712U)
505 s->workaround_bugs|= FF_BUG_DC_CLIP;
506
507 if(s->divx_version>=0)
508 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
509 //printf("padding_bug_score: %d\n", s->padding_bug_score);
510 if(s->divx_version==501 && s->divx_build==20020416)
511 s->padding_bug_score= 256*256*256*64;
512
513 if(s->divx_version<500U){
514 s->workaround_bugs|= FF_BUG_EDGE;
515 }
516
517 if(s->divx_version>=0)
518 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
519 #if 0
520 if(s->divx_version==500)
521 s->padding_bug_score= 256*256*256*64;
522
523 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
524 * Let us hope this at least works.
525 */
526 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
527 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
528 s->workaround_bugs|= FF_BUG_NO_PADDING;
529
530 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
531 s->workaround_bugs|= FF_BUG_NO_PADDING;
532 #endif
533 }
534
535 if(s->workaround_bugs& FF_BUG_STD_QPEL){
536 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
537 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
538 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
539 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
540 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
541 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
542
543 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
544 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
545 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
546 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
547 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
548 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
549 }
550
551 if(avctx->debug & FF_DEBUG_BUGS)
552 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
553 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
554 s->divx_packed ? "p" : "");
555
556 #if HAVE_MMX
557 if (s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
558 avctx->idct_algo= FF_IDCT_XVIDMMX;
559 ff_dct_common_init(s);
560 s->picture_number=0;
561 }
562 #endif
563
564 /* After H263 & mpeg4 header decode we have the height, width,*/
565 /* and other parameters. So then we could init the picture */
566 /* FIXME: By the way H263 decoder is evolving it should have */
567 /* an H263EncContext */
568
569 if ( s->width != avctx->coded_width
570 || s->height != avctx->coded_height) {
571 /* H.263 could change picture size any time */
572 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
573
574 if (HAVE_THREADS && (s->avctx->active_thread_type&FF_THREAD_FRAME)) {
575 av_log_missing_feature(s->avctx, "Width/height/bit depth/chroma idc changing with threads is", 0);
576 return -1; // width / height changed during parallelized decoding
577 }
578
579 s->parse_context.buffer=0;
580 ff_MPV_common_end(s);
581 s->parse_context= pc;
582 }
583 if (!s->context_initialized) {
584 avcodec_set_dimensions(avctx, s->width, s->height);
585
586 goto retry;
587 }
588
589 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
590 s->gob_index = ff_h263_get_gob_height(s);
591
592 // for skipping the frame
593 s->current_picture.f.pict_type = s->pict_type;
594 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
595
596 /* skip B-frames if we don't have reference frames */
597 if(s->last_picture_ptr==NULL && (s->pict_type==AV_PICTURE_TYPE_B || s->dropable)) return get_consumed_bytes(s, buf_size);
598 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
599 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
600 || avctx->skip_frame >= AVDISCARD_ALL)
601 return get_consumed_bytes(s, buf_size);
602
603 if(s->next_p_frame_damaged){
604 if(s->pict_type==AV_PICTURE_TYPE_B)
605 return get_consumed_bytes(s, buf_size);
606 else
607 s->next_p_frame_damaged=0;
608 }
609
610 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==AV_PICTURE_TYPE_B){
611 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
612 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
613 }else if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
614 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
615 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
616 }else{
617 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
618 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
619 }
620
621 if(ff_MPV_frame_start(s, avctx) < 0)
622 return -1;
623
624 if (!s->divx_packed) ff_thread_finish_setup(avctx);
625
626 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
627 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
628 goto frame_end;
629 }
630
631 if (avctx->hwaccel) {
632 if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
633 return -1;
634 }
635
636 ff_er_frame_start(s);
637
638 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
639 //which is not available before ff_MPV_frame_start()
640 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
641 ret = ff_wmv2_decode_secondary_picture_header(s);
642 if(ret<0) return ret;
643 if(ret==1) goto intrax8_decoded;
644 }
645
646 /* decode each macroblock */
647 s->mb_x=0;
648 s->mb_y=0;
649
650 ret = decode_slice(s);
651 while(s->mb_y<s->mb_height){
652 if(s->msmpeg4_version){
653 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
654 break;
655 }else{
656 int prev_x=s->mb_x, prev_y=s->mb_y;
657 if(ff_h263_resync(s)<0)
658 break;
659 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
660 s->error_occurred = 1;
661 }
662
663 if(s->msmpeg4_version<4 && s->h263_pred)
664 ff_mpeg4_clean_buffers(s);
665
666 if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
667 }
668
669 if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
670 if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
671 s->error_status_table[s->mb_num-1]= ER_MB_ERROR;
672 }
673
674 assert(s->bitstream_buffer_size==0);
675 frame_end:
676 /* divx 5.01+ bistream reorder stuff */
677 if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
678 int current_pos= get_bits_count(&s->gb)>>3;
679 int startcode_found=0;
680
681 if(buf_size - current_pos > 5){
682 int i;
683 for(i=current_pos; i<buf_size-3; i++){
684 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
685 startcode_found=1;
686 break;
687 }
688 }
689 }
690 if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
691 startcode_found=1;
692 current_pos=0;
693 }
694
695 if(startcode_found){
696 av_fast_malloc(
697 &s->bitstream_buffer,
698 &s->allocated_bitstream_buffer_size,
699 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
700 if (!s->bitstream_buffer)
701 return AVERROR(ENOMEM);
702 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
703 s->bitstream_buffer_size= buf_size - current_pos;
704 }
705 }
706
707 intrax8_decoded:
708 ff_er_frame_end(s);
709
710 if (avctx->hwaccel) {
711 if (avctx->hwaccel->end_frame(avctx) < 0)
712 return -1;
713 }
714
715 ff_MPV_frame_end(s);
716
717 assert(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
718 assert(s->current_picture.f.pict_type == s->pict_type);
719 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
720 *pict = s->current_picture_ptr->f;
721 } else if (s->last_picture_ptr != NULL) {
722 *pict = s->last_picture_ptr->f;
723 }
724
725 if(s->last_picture_ptr || s->low_delay){
726 *data_size = sizeof(AVFrame);
727 ff_print_debug_info(s, pict);
728 }
729
730 #ifdef PRINT_FRAME_TIME
731 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
732 #endif
733
734 return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
735 }
736
737 AVCodec ff_h263_decoder = {
738 .name = "h263",
739 .type = AVMEDIA_TYPE_VIDEO,
740 .id = CODEC_ID_H263,
741 .priv_data_size = sizeof(MpegEncContext),
742 .init = ff_h263_decode_init,
743 .close = ff_h263_decode_end,
744 .decode = ff_h263_decode_frame,
745 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
746 .flush= ff_mpeg_flush,
747 .max_lowres= 3,
748 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
749 .pix_fmts= ff_hwaccel_pixfmt_list_420,
750 };