lavc: fix decode_frame() third parameter semantics for video decoders
[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 if (avctx->codec->id == AV_CODEC_ID_MSS2)
62 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
63 else
64 avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
65 s->unrestricted_mv= 1;
66
67 /* select sub codec */
68 switch(avctx->codec->id) {
69 case AV_CODEC_ID_H263:
70 s->unrestricted_mv= 0;
71 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
72 break;
73 case AV_CODEC_ID_MPEG4:
74 break;
75 case AV_CODEC_ID_MSMPEG4V1:
76 s->h263_pred = 1;
77 s->msmpeg4_version=1;
78 break;
79 case AV_CODEC_ID_MSMPEG4V2:
80 s->h263_pred = 1;
81 s->msmpeg4_version=2;
82 break;
83 case AV_CODEC_ID_MSMPEG4V3:
84 s->h263_pred = 1;
85 s->msmpeg4_version=3;
86 break;
87 case AV_CODEC_ID_WMV1:
88 s->h263_pred = 1;
89 s->msmpeg4_version=4;
90 break;
91 case AV_CODEC_ID_WMV2:
92 s->h263_pred = 1;
93 s->msmpeg4_version=5;
94 break;
95 case AV_CODEC_ID_VC1:
96 case AV_CODEC_ID_WMV3:
97 case AV_CODEC_ID_VC1IMAGE:
98 case AV_CODEC_ID_WMV3IMAGE:
99 case AV_CODEC_ID_MSS2:
100 s->h263_pred = 1;
101 s->msmpeg4_version=6;
102 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
103 break;
104 case AV_CODEC_ID_H263I:
105 break;
106 case AV_CODEC_ID_FLV1:
107 s->h263_flv = 1;
108 break;
109 default:
110 return -1;
111 }
112 s->codec_id= avctx->codec->id;
113 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
114
115 /* for h263, we allocate the images after having read the header */
116 if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_MPEG4)
117 if (ff_MPV_common_init(s) < 0)
118 return -1;
119
120 ff_h263_decode_init_vlc(s);
121
122 return 0;
123 }
124
125 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
126 {
127 MpegEncContext *s = avctx->priv_data;
128
129 ff_MPV_common_end(s);
130 return 0;
131 }
132
133 /**
134 * Return the number of bytes consumed for building the current frame.
135 */
136 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
137 int pos= (get_bits_count(&s->gb)+7)>>3;
138
139 if(s->divx_packed || s->avctx->hwaccel){
140 //we would have to scan through the whole buf to handle the weird reordering ...
141 return buf_size;
142 }else if(s->flags&CODEC_FLAG_TRUNCATED){
143 pos -= s->parse_context.last_index;
144 if(pos<0) pos=0; // padding is not really read so this might be -1
145 return pos;
146 }else{
147 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
148 if(pos+10>buf_size) pos=buf_size; // oops ;)
149
150 return pos;
151 }
152 }
153
154 static int decode_slice(MpegEncContext *s){
155 const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
156 const int mb_size = 16;
157 s->last_resync_gb= s->gb;
158 s->first_slice_line= 1;
159
160 s->resync_mb_x= s->mb_x;
161 s->resync_mb_y= s->mb_y;
162
163 ff_set_qscale(s, s->qscale);
164
165 if (s->avctx->hwaccel) {
166 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
167 const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
168 skip_bits_long(&s->gb, 8*(end - start));
169 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
170 }
171
172 if(s->partitioned_frame){
173 const int qscale= s->qscale;
174
175 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
176 if(ff_mpeg4_decode_partitions(s) < 0)
177 return -1;
178 }
179
180 /* restore variables which were modified */
181 s->first_slice_line=1;
182 s->mb_x= s->resync_mb_x;
183 s->mb_y= s->resync_mb_y;
184 ff_set_qscale(s, qscale);
185 }
186
187 for(; s->mb_y < s->mb_height; s->mb_y++) {
188 /* per-row end of slice checks */
189 if(s->msmpeg4_version){
190 if(s->resync_mb_y + s->slice_height == s->mb_y){
191 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
192
193 return 0;
194 }
195 }
196
197 if(s->msmpeg4_version==1){
198 s->last_dc[0]=
199 s->last_dc[1]=
200 s->last_dc[2]= 128;
201 }
202
203 ff_init_block_index(s);
204 for(; s->mb_x < s->mb_width; s->mb_x++) {
205 int ret;
206
207 ff_update_block_index(s);
208
209 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
210 s->first_slice_line=0;
211 }
212
213 /* DCT & quantize */
214
215 s->mv_dir = MV_DIR_FORWARD;
216 s->mv_type = MV_TYPE_16X16;
217 // s->mb_skipped = 0;
218 av_dlog(s, "%d %d %06X\n",
219 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
220 ret= s->decode_mb(s, s->block);
221
222 if (s->pict_type!=AV_PICTURE_TYPE_B)
223 ff_h263_update_motion_val(s);
224
225 if(ret<0){
226 const int xy= s->mb_x + s->mb_y*s->mb_stride;
227 if(ret==SLICE_END){
228 ff_MPV_decode_mb(s, s->block);
229 if(s->loop_filter)
230 ff_h263_loop_filter(s);
231
232 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
233
234 s->padding_bug_score--;
235
236 if(++s->mb_x >= s->mb_width){
237 s->mb_x=0;
238 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
239 ff_MPV_report_decode_progress(s);
240 s->mb_y++;
241 }
242 return 0;
243 }else if(ret==SLICE_NOEND){
244 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
245 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);
246 return -1;
247 }
248 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
249 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
250
251 return -1;
252 }
253
254 ff_MPV_decode_mb(s, s->block);
255 if(s->loop_filter)
256 ff_h263_loop_filter(s);
257 }
258
259 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
260 ff_MPV_report_decode_progress(s);
261
262 s->mb_x= 0;
263 }
264
265 assert(s->mb_x==0 && s->mb_y==s->mb_height);
266
267 if(s->codec_id==AV_CODEC_ID_MPEG4
268 && (s->workaround_bugs&FF_BUG_AUTODETECT)
269 && get_bits_left(&s->gb) >= 48
270 && show_bits(&s->gb, 24)==0x4010
271 && !s->data_partitioning)
272 s->padding_bug_score+=32;
273
274 /* try to detect the padding bug */
275 if( s->codec_id==AV_CODEC_ID_MPEG4
276 && (s->workaround_bugs&FF_BUG_AUTODETECT)
277 && get_bits_left(&s->gb) >=0
278 && get_bits_left(&s->gb) < 48
279 // && !s->resync_marker
280 && !s->data_partitioning){
281
282 const int bits_count= get_bits_count(&s->gb);
283 const int bits_left = s->gb.size_in_bits - bits_count;
284
285 if(bits_left==0){
286 s->padding_bug_score+=16;
287 } else if(bits_left != 1){
288 int v= show_bits(&s->gb, 8);
289 v|= 0x7F >> (7-(bits_count&7));
290
291 if(v==0x7F && bits_left<=8)
292 s->padding_bug_score--;
293 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
294 s->padding_bug_score+= 4;
295 else
296 s->padding_bug_score++;
297 }
298 }
299
300 if(s->workaround_bugs&FF_BUG_AUTODETECT){
301 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
302 s->workaround_bugs |= FF_BUG_NO_PADDING;
303 else
304 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
305 }
306
307 // handle formats which don't have unique end markers
308 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
309 int left= get_bits_left(&s->gb);
310 int max_extra=7;
311
312 /* no markers in M$ crap */
313 if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
314 max_extra+= 17;
315
316 /* buggy padding but the frame should still end approximately at the bitstream end */
317 if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&AV_EF_BUFFER))
318 max_extra+= 48;
319 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
320 max_extra+= 256*256*256*64;
321
322 if(left>max_extra){
323 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
324 }
325 else if(left<0){
326 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
327 }else
328 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
329
330 return 0;
331 }
332
333 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
334 get_bits_left(&s->gb),
335 show_bits(&s->gb, 24), s->padding_bug_score);
336
337 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
338
339 return -1;
340 }
341
342 int ff_h263_decode_frame(AVCodecContext *avctx,
343 void *data, int *got_frame,
344 AVPacket *avpkt)
345 {
346 const uint8_t *buf = avpkt->data;
347 int buf_size = avpkt->size;
348 MpegEncContext *s = avctx->priv_data;
349 int ret;
350 AVFrame *pict = data;
351
352 #ifdef PRINT_FRAME_TIME
353 uint64_t time= rdtsc();
354 #endif
355 s->flags= avctx->flags;
356 s->flags2= avctx->flags2;
357
358 /* no supplementary picture */
359 if (buf_size == 0) {
360 /* special case for last picture */
361 if (s->low_delay==0 && s->next_picture_ptr) {
362 *pict = s->next_picture_ptr->f;
363 s->next_picture_ptr= NULL;
364
365 *got_frame = 1;
366 }
367
368 return 0;
369 }
370
371 if(s->flags&CODEC_FLAG_TRUNCATED){
372 int next;
373
374 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
375 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
376 }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
377 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
378 }else{
379 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
380 return -1;
381 }
382
383 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
384 return buf_size;
385 }
386
387
388 retry:
389
390 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
391 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
392 }else
393 init_get_bits(&s->gb, buf, buf_size*8);
394 s->bitstream_buffer_size=0;
395
396 if (!s->context_initialized) {
397 if (ff_MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
398 return -1;
399 }
400
401 /* We need to set current_picture_ptr before reading the header,
402 * otherwise we cannot store anyting in there */
403 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
404 int i= ff_find_unused_picture(s, 0);
405 if (i < 0)
406 return i;
407 s->current_picture_ptr= &s->picture[i];
408 }
409
410 /* let's go :-) */
411 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
412 ret= ff_wmv2_decode_picture_header(s);
413 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
414 ret = ff_msmpeg4_decode_picture_header(s);
415 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
416 if(s->avctx->extradata_size && s->picture_number==0){
417 GetBitContext gb;
418
419 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
420 ret = ff_mpeg4_decode_picture_header(s, &gb);
421 }
422 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
423 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
424 ret = ff_intel_h263_decode_picture_header(s);
425 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
426 ret = ff_flv_decode_picture_header(s);
427 } else {
428 ret = ff_h263_decode_picture_header(s);
429 }
430
431 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
432
433 /* skip if the header was thrashed */
434 if (ret < 0){
435 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
436 return -1;
437 }
438
439 avctx->has_b_frames= !s->low_delay;
440
441 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
442 if(s->stream_codec_tag == AV_RL32("XVID") ||
443 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
444 s->codec_tag == AV_RL32("RMP4") ||
445 s->codec_tag == AV_RL32("SIPP")
446 )
447 s->xvid_build= 0;
448 #if 0
449 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
450 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
451 s->xvid_build= 0;
452 #endif
453 }
454
455 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
456 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
457 s->divx_version= 400; //divx 4
458 }
459
460 if(s->xvid_build>=0 && s->divx_version>=0){
461 s->divx_version=
462 s->divx_build= -1;
463 }
464
465 if(s->workaround_bugs&FF_BUG_AUTODETECT){
466 if(s->codec_tag == AV_RL32("XVIX"))
467 s->workaround_bugs|= FF_BUG_XVID_ILACE;
468
469 if(s->codec_tag == AV_RL32("UMP4")){
470 s->workaround_bugs|= FF_BUG_UMP4;
471 }
472
473 if(s->divx_version>=500 && s->divx_build<1814){
474 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
475 }
476
477 if(s->divx_version>502 && s->divx_build<1814){
478 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
479 }
480
481 if(s->xvid_build<=3U)
482 s->padding_bug_score= 256*256*256*64;
483
484 if(s->xvid_build<=1U)
485 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
486
487 if(s->xvid_build<=12U)
488 s->workaround_bugs|= FF_BUG_EDGE;
489
490 if(s->xvid_build<=32U)
491 s->workaround_bugs|= FF_BUG_DC_CLIP;
492
493 #define SET_QPEL_FUNC(postfix1, postfix2) \
494 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
495 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
496 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
497
498 if(s->lavc_build<4653U)
499 s->workaround_bugs|= FF_BUG_STD_QPEL;
500
501 if(s->lavc_build<4655U)
502 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
503
504 if(s->lavc_build<4670U){
505 s->workaround_bugs|= FF_BUG_EDGE;
506 }
507
508 if(s->lavc_build<=4712U)
509 s->workaround_bugs|= FF_BUG_DC_CLIP;
510
511 if(s->divx_version>=0)
512 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
513 if(s->divx_version==501 && s->divx_build==20020416)
514 s->padding_bug_score= 256*256*256*64;
515
516 if(s->divx_version<500U){
517 s->workaround_bugs|= FF_BUG_EDGE;
518 }
519
520 if(s->divx_version>=0)
521 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
522 #if 0
523 if(s->divx_version==500)
524 s->padding_bug_score= 256*256*256*64;
525
526 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
527 * Let us hope this at least works.
528 */
529 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
530 && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
531 s->workaround_bugs|= FF_BUG_NO_PADDING;
532
533 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
534 s->workaround_bugs|= FF_BUG_NO_PADDING;
535 #endif
536 }
537
538 if(s->workaround_bugs& FF_BUG_STD_QPEL){
539 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
540 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
541 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
542 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
543 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
544 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
545
546 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
547 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
548 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
549 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
550 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
551 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
552 }
553
554 if(avctx->debug & FF_DEBUG_BUGS)
555 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
556 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
557 s->divx_packed ? "p" : "");
558
559 #if HAVE_MMX
560 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)) {
561 avctx->idct_algo= FF_IDCT_XVIDMMX;
562 ff_dct_common_init(s);
563 s->picture_number=0;
564 }
565 #endif
566
567 /* After H263 & mpeg4 header decode we have the height, width,*/
568 /* and other parameters. So then we could init the picture */
569 /* FIXME: By the way H263 decoder is evolving it should have */
570 /* an H263EncContext */
571
572 if (!avctx->coded_width || !avctx->coded_height) {
573 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
574
575 s->parse_context.buffer=0;
576 ff_MPV_common_end(s);
577 s->parse_context= pc;
578 avcodec_set_dimensions(avctx, s->width, s->height);
579
580 goto retry;
581 }
582
583 if (s->width != avctx->coded_width ||
584 s->height != avctx->coded_height ||
585 s->context_reinit) {
586 /* H.263 could change picture size any time */
587 s->context_reinit = 0;
588
589 avcodec_set_dimensions(avctx, s->width, s->height);
590
591 if ((ret = ff_MPV_common_frame_size_change(s)))
592 return ret;
593 }
594
595 if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
596 s->gob_index = ff_h263_get_gob_height(s);
597
598 // for skipping the frame
599 s->current_picture.f.pict_type = s->pict_type;
600 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
601
602 /* skip B-frames if we don't have reference frames */
603 if(s->last_picture_ptr==NULL && (s->pict_type==AV_PICTURE_TYPE_B || s->dropable)) return get_consumed_bytes(s, buf_size);
604 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
605 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
606 || avctx->skip_frame >= AVDISCARD_ALL)
607 return get_consumed_bytes(s, buf_size);
608
609 if(s->next_p_frame_damaged){
610 if(s->pict_type==AV_PICTURE_TYPE_B)
611 return get_consumed_bytes(s, buf_size);
612 else
613 s->next_p_frame_damaged=0;
614 }
615
616 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==AV_PICTURE_TYPE_B){
617 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
618 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
619 }else if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
620 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
621 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
622 }else{
623 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
624 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
625 }
626
627 if(ff_MPV_frame_start(s, avctx) < 0)
628 return -1;
629
630 if (!s->divx_packed) ff_thread_finish_setup(avctx);
631
632 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
633 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
634 goto frame_end;
635 }
636
637 if (avctx->hwaccel) {
638 if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
639 return -1;
640 }
641
642 ff_er_frame_start(s);
643
644 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
645 //which is not available before ff_MPV_frame_start()
646 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
647 ret = ff_wmv2_decode_secondary_picture_header(s);
648 if(ret<0) return ret;
649 if(ret==1) goto intrax8_decoded;
650 }
651
652 /* decode each macroblock */
653 s->mb_x=0;
654 s->mb_y=0;
655
656 ret = decode_slice(s);
657 while(s->mb_y<s->mb_height){
658 if(s->msmpeg4_version){
659 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
660 break;
661 }else{
662 int prev_x=s->mb_x, prev_y=s->mb_y;
663 if(ff_h263_resync(s)<0)
664 break;
665 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
666 s->error_occurred = 1;
667 }
668
669 if(s->msmpeg4_version<4 && s->h263_pred)
670 ff_mpeg4_clean_buffers(s);
671
672 if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
673 }
674
675 if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
676 if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
677 s->error_status_table[s->mb_num-1]= ER_MB_ERROR;
678 }
679
680 assert(s->bitstream_buffer_size==0);
681 frame_end:
682 /* divx 5.01+ bistream reorder stuff */
683 if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
684 int current_pos= get_bits_count(&s->gb)>>3;
685 int startcode_found=0;
686
687 if(buf_size - current_pos > 5){
688 int i;
689 for(i=current_pos; i<buf_size-3; i++){
690 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
691 startcode_found=1;
692 break;
693 }
694 }
695 }
696 if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
697 startcode_found=1;
698 current_pos=0;
699 }
700
701 if(startcode_found){
702 av_fast_malloc(
703 &s->bitstream_buffer,
704 &s->allocated_bitstream_buffer_size,
705 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
706 if (!s->bitstream_buffer)
707 return AVERROR(ENOMEM);
708 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
709 s->bitstream_buffer_size= buf_size - current_pos;
710 }
711 }
712
713 intrax8_decoded:
714 ff_er_frame_end(s);
715
716 if (avctx->hwaccel) {
717 if (avctx->hwaccel->end_frame(avctx) < 0)
718 return -1;
719 }
720
721 ff_MPV_frame_end(s);
722
723 assert(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
724 assert(s->current_picture.f.pict_type == s->pict_type);
725 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
726 *pict = s->current_picture_ptr->f;
727 } else if (s->last_picture_ptr != NULL) {
728 *pict = s->last_picture_ptr->f;
729 }
730
731 if(s->last_picture_ptr || s->low_delay){
732 *got_frame = 1;
733 ff_print_debug_info(s, pict);
734 }
735
736 #ifdef PRINT_FRAME_TIME
737 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
738 #endif
739
740 return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
741 }
742
743 AVCodec ff_h263_decoder = {
744 .name = "h263",
745 .type = AVMEDIA_TYPE_VIDEO,
746 .id = AV_CODEC_ID_H263,
747 .priv_data_size = sizeof(MpegEncContext),
748 .init = ff_h263_decode_init,
749 .close = ff_h263_decode_end,
750 .decode = ff_h263_decode_frame,
751 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
752 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
753 .flush = ff_mpeg_flush,
754 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
755 .pix_fmts = ff_hwaccel_pixfmt_list_420,
756 };