3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
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.
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.
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
28 #define UNCHECKED_BITSTREAM_READER 1
30 #include "libavutil/cpu.h"
34 #include "mpegvideo.h"
36 #include "h263_parser.h"
37 #include "mpeg4video_parser.h"
39 #include "vdpau_internal.h"
42 #include "mpeg4video.h"
45 //#define PRINT_FRAME_TIME
47 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
49 MpegEncContext *s = avctx->priv_data;
53 s->out_format = FMT_H263;
55 s->width = avctx->coded_width;
56 s->height = avctx->coded_height;
57 s->workaround_bugs= avctx->workaround_bugs;
60 ff_MPV_decode_defaults(s);
62 s->decode_mb= ff_h263_decode_mb;
64 if (avctx->codec->id == AV_CODEC_ID_MSS2)
65 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
67 avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
68 s->unrestricted_mv= 1;
70 /* select sub codec */
71 switch(avctx->codec->id) {
72 case AV_CODEC_ID_H263:
73 case AV_CODEC_ID_H263P:
74 s->unrestricted_mv= 0;
75 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
77 case AV_CODEC_ID_MPEG4:
79 case AV_CODEC_ID_MSMPEG4V1:
83 case AV_CODEC_ID_MSMPEG4V2:
87 case AV_CODEC_ID_MSMPEG4V3:
91 case AV_CODEC_ID_WMV1:
95 case AV_CODEC_ID_WMV2:
100 case AV_CODEC_ID_WMV3:
101 case AV_CODEC_ID_VC1IMAGE:
102 case AV_CODEC_ID_WMV3IMAGE:
103 case AV_CODEC_ID_MSS2:
105 s->msmpeg4_version=6;
106 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
108 case AV_CODEC_ID_H263I:
110 case AV_CODEC_ID_FLV1:
114 return AVERROR(EINVAL);
116 s->codec_id= avctx->codec->id;
117 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
119 /* for h263, we allocate the images after having read the header */
120 if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
121 if ((ret = ff_MPV_common_init(s)) < 0)
124 ff_h263_decode_init_vlc(s);
129 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
131 MpegEncContext *s = avctx->priv_data;
133 ff_MPV_common_end(s);
138 * Return the number of bytes consumed for building the current frame.
140 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
141 int pos= (get_bits_count(&s->gb)+7)>>3;
143 if(s->divx_packed || s->avctx->hwaccel){
144 //we would have to scan through the whole buf to handle the weird reordering ...
146 }else if(s->flags&CODEC_FLAG_TRUNCATED){
147 pos -= s->parse_context.last_index;
148 if(pos<0) pos=0; // padding is not really read so this might be -1
151 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
152 if(pos+10>buf_size) pos=buf_size; // oops ;)
158 static int decode_slice(MpegEncContext *s){
159 const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
160 const int mb_size= 16>>s->avctx->lowres;
163 s->last_resync_gb= s->gb;
164 s->first_slice_line= 1;
166 s->resync_mb_x= s->mb_x;
167 s->resync_mb_y= s->mb_y;
169 ff_set_qscale(s, s->qscale);
171 if (s->avctx->hwaccel) {
172 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
173 const uint8_t *end = ff_h263_find_resync_marker(s, start + 1, s->gb.buffer_end);
174 skip_bits_long(&s->gb, 8*(end - start));
175 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
178 if(s->partitioned_frame){
179 const int qscale= s->qscale;
181 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
182 if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
186 /* restore variables which were modified */
187 s->first_slice_line=1;
188 s->mb_x= s->resync_mb_x;
189 s->mb_y= s->resync_mb_y;
190 ff_set_qscale(s, qscale);
193 for(; s->mb_y < s->mb_height; s->mb_y++) {
194 /* per-row end of slice checks */
195 if(s->msmpeg4_version){
196 if(s->resync_mb_y + s->slice_height == s->mb_y){
197 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
203 if(s->msmpeg4_version==1){
209 ff_init_block_index(s);
210 for(; s->mb_x < s->mb_width; s->mb_x++) {
213 ff_update_block_index(s);
215 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
216 s->first_slice_line=0;
221 s->mv_dir = MV_DIR_FORWARD;
222 s->mv_type = MV_TYPE_16X16;
223 // s->mb_skipped = 0;
224 av_dlog(s, "%d %d %06X\n",
225 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
226 ret= s->decode_mb(s, s->block);
228 if (s->pict_type!=AV_PICTURE_TYPE_B)
229 ff_h263_update_motion_val(s);
232 const int xy= s->mb_x + s->mb_y*s->mb_stride;
234 ff_MPV_decode_mb(s, s->block);
236 ff_h263_loop_filter(s);
238 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
240 s->padding_bug_score--;
242 if(++s->mb_x >= s->mb_width){
244 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
245 ff_MPV_report_decode_progress(s);
249 }else if(ret==SLICE_NOEND){
250 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
251 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);
252 return AVERROR_INVALIDDATA;
254 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
255 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
257 return AVERROR_INVALIDDATA;
260 ff_MPV_decode_mb(s, s->block);
262 ff_h263_loop_filter(s);
265 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
266 ff_MPV_report_decode_progress(s);
271 av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
273 if(s->codec_id==AV_CODEC_ID_MPEG4
274 && (s->workaround_bugs&FF_BUG_AUTODETECT)
275 && get_bits_left(&s->gb) >= 48
276 && show_bits(&s->gb, 24)==0x4010
277 && !s->data_partitioning)
278 s->padding_bug_score+=32;
280 /* try to detect the padding bug */
281 if( s->codec_id==AV_CODEC_ID_MPEG4
282 && (s->workaround_bugs&FF_BUG_AUTODETECT)
283 && get_bits_left(&s->gb) >=0
284 && get_bits_left(&s->gb) < 137
285 // && !s->resync_marker
286 && !s->data_partitioning){
288 const int bits_count= get_bits_count(&s->gb);
289 const int bits_left = s->gb.size_in_bits - bits_count;
292 s->padding_bug_score+=16;
293 } else if(bits_left != 1){
294 int v= show_bits(&s->gb, 8);
295 v|= 0x7F >> (7-(bits_count&7));
297 if(v==0x7F && bits_left<=8)
298 s->padding_bug_score--;
299 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
300 s->padding_bug_score+= 4;
302 s->padding_bug_score++;
306 if(s->workaround_bugs&FF_BUG_AUTODETECT){
307 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
308 s->workaround_bugs |= FF_BUG_NO_PADDING;
310 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
313 // handle formats which don't have unique end markers
314 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
315 int left= get_bits_left(&s->gb);
318 /* no markers in M$ crap */
319 if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
322 /* buggy padding but the frame should still end approximately at the bitstream end */
323 if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
325 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
326 max_extra+= 256*256*256*64;
329 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
332 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
334 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
339 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
340 get_bits_left(&s->gb),
341 show_bits(&s->gb, 24), s->padding_bug_score);
343 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
345 return AVERROR_INVALIDDATA;
348 int ff_h263_decode_frame(AVCodecContext *avctx,
349 void *data, int *got_frame,
352 const uint8_t *buf = avpkt->data;
353 int buf_size = avpkt->size;
354 MpegEncContext *s = avctx->priv_data;
356 AVFrame *pict = data;
358 #ifdef PRINT_FRAME_TIME
359 uint64_t time= rdtsc();
361 s->flags= avctx->flags;
362 s->flags2= avctx->flags2;
364 /* no supplementary picture */
366 /* special case for last picture */
367 if (s->low_delay==0 && s->next_picture_ptr) {
368 *pict = s->next_picture_ptr->f;
369 s->next_picture_ptr= NULL;
377 if(s->flags&CODEC_FLAG_TRUNCATED){
380 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
381 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
382 }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
383 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
384 }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
385 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
387 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
388 return AVERROR(EINVAL);
391 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
397 if(s->divx_packed && s->bitstream_buffer_size){
399 for(i=0; i<buf_size-3; i++){
400 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
402 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
403 s->bitstream_buffer_size=0;
410 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
411 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
413 init_get_bits(&s->gb, buf, buf_size*8);
414 s->bitstream_buffer_size=0;
416 if (!s->context_initialized) {
417 if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
421 /* We need to set current_picture_ptr before reading the header,
422 * otherwise we cannot store anyting in there */
423 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
424 int i= ff_find_unused_picture(s, 0);
427 s->current_picture_ptr= &s->picture[i];
431 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
432 ret= ff_wmv2_decode_picture_header(s);
433 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
434 ret = ff_msmpeg4_decode_picture_header(s);
435 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
436 if(s->avctx->extradata_size && s->picture_number==0){
439 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
440 ret = ff_mpeg4_decode_picture_header(s, &gb);
442 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
443 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
444 ret = ff_intel_h263_decode_picture_header(s);
445 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
446 ret = ff_flv_decode_picture_header(s);
448 ret = ff_h263_decode_picture_header(s);
451 if (ret < 0 || ret==FRAME_SKIPPED) {
452 if ( s->width != avctx->coded_width
453 || s->height != avctx->coded_height) {
454 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
455 s->width = avctx->coded_width;
456 s->height= avctx->coded_height;
459 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
461 /* skip if the header was thrashed */
463 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
467 avctx->has_b_frames= !s->low_delay;
469 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
470 if(s->stream_codec_tag == AV_RL32("XVID") ||
471 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
472 s->codec_tag == AV_RL32("RMP4") ||
473 s->codec_tag == AV_RL32("SIPP")
477 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
478 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
483 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
484 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
485 s->divx_version= 400; //divx 4
488 if(s->xvid_build>=0 && s->divx_version>=0){
493 if(s->workaround_bugs&FF_BUG_AUTODETECT){
494 if(s->codec_tag == AV_RL32("XVIX"))
495 s->workaround_bugs|= FF_BUG_XVID_ILACE;
497 if(s->codec_tag == AV_RL32("UMP4")){
498 s->workaround_bugs|= FF_BUG_UMP4;
501 if(s->divx_version>=500 && s->divx_build<1814){
502 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
505 if(s->divx_version>502 && s->divx_build<1814){
506 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
509 if(s->xvid_build<=3U)
510 s->padding_bug_score= 256*256*256*64;
512 if(s->xvid_build<=1U)
513 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
515 if(s->xvid_build<=12U)
516 s->workaround_bugs|= FF_BUG_EDGE;
518 if(s->xvid_build<=32U)
519 s->workaround_bugs|= FF_BUG_DC_CLIP;
521 #define SET_QPEL_FUNC(postfix1, postfix2) \
522 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
523 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
524 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
526 if(s->lavc_build<4653U)
527 s->workaround_bugs|= FF_BUG_STD_QPEL;
529 if(s->lavc_build<4655U)
530 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
532 if(s->lavc_build<4670U){
533 s->workaround_bugs|= FF_BUG_EDGE;
536 if(s->lavc_build<=4712U)
537 s->workaround_bugs|= FF_BUG_DC_CLIP;
539 if(s->divx_version>=0)
540 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
541 if(s->divx_version==501 && s->divx_build==20020416)
542 s->padding_bug_score= 256*256*256*64;
544 if(s->divx_version<500U){
545 s->workaround_bugs|= FF_BUG_EDGE;
548 if(s->divx_version>=0)
549 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
551 if(s->divx_version==500)
552 s->padding_bug_score= 256*256*256*64;
554 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
555 * Let us hope this at least works.
557 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
558 && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
559 s->workaround_bugs|= FF_BUG_NO_PADDING;
561 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
562 s->workaround_bugs|= FF_BUG_NO_PADDING;
566 if(s->workaround_bugs& FF_BUG_STD_QPEL){
567 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
568 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
569 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
570 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
571 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
572 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
574 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
575 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
576 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
577 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
578 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
579 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
582 if(avctx->debug & FF_DEBUG_BUGS)
583 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
584 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
585 s->divx_packed ? "p" : "");
588 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)) {
589 avctx->idct_algo= FF_IDCT_XVIDMMX;
590 ff_dct_common_init(s);
595 /* After H263 & mpeg4 header decode we have the height, width,*/
596 /* and other parameters. So then we could init the picture */
597 /* FIXME: By the way H263 decoder is evolving it should have */
598 /* an H263EncContext */
600 if ((!avctx->coded_width || !avctx->coded_height) && 0) {
601 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
603 s->parse_context.buffer=0;
604 ff_MPV_common_end(s);
605 s->parse_context= pc;
606 avcodec_set_dimensions(avctx, s->width, s->height);
611 if (s->width != avctx->coded_width ||
612 s->height != avctx->coded_height ||
614 /* H.263 could change picture size any time */
615 s->context_reinit = 0;
617 avcodec_set_dimensions(avctx, s->width, s->height);
619 if ((ret = ff_MPV_common_frame_size_change(s)))
623 if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
624 s->gob_index = ff_h263_get_gob_height(s);
626 // for skipping the frame
627 s->current_picture.f.pict_type = s->pict_type;
628 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
630 /* skip B-frames if we don't have reference frames */
631 if (s->last_picture_ptr == NULL &&
632 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
633 return get_consumed_bytes(s, buf_size);
634 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
635 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
636 || avctx->skip_frame >= AVDISCARD_ALL)
637 return get_consumed_bytes(s, buf_size);
639 if(s->next_p_frame_damaged){
640 if(s->pict_type==AV_PICTURE_TYPE_B)
641 return get_consumed_bytes(s, buf_size);
643 s->next_p_frame_damaged=0;
646 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==AV_PICTURE_TYPE_B){
647 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
648 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
649 }else if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
650 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
651 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
653 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
654 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
657 if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
660 if (!s->divx_packed) ff_thread_finish_setup(avctx);
662 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
663 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
667 if (avctx->hwaccel) {
668 if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
672 ff_er_frame_start(s);
674 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
675 //which is not available before ff_MPV_frame_start()
676 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
677 ret = ff_wmv2_decode_secondary_picture_header(s);
678 if(ret<0) return ret;
679 if(ret==1) goto intrax8_decoded;
682 /* decode each macroblock */
686 ret = decode_slice(s);
687 while(s->mb_y<s->mb_height){
688 if(s->msmpeg4_version){
689 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
692 int prev_x=s->mb_x, prev_y=s->mb_y;
693 if(ff_h263_resync(s)<0)
695 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
696 s->error_occurred = 1;
699 if(s->msmpeg4_version<4 && s->h263_pred)
700 ff_mpeg4_clean_buffers(s);
702 if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
705 if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
706 if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
707 s->error_status_table[s->mb_num-1]= ER_MB_ERROR;
710 av_assert1(s->bitstream_buffer_size==0);
712 /* divx 5.01+ bitstream reorder stuff */
713 if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
714 int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
715 int startcode_found=0;
717 if(buf_size - current_pos > 7){
719 for(i=current_pos; i<buf_size-4; i++){
720 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
721 startcode_found=!(buf[i+4]&0x40);
729 &s->bitstream_buffer,
730 &s->allocated_bitstream_buffer_size,
731 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
732 if (!s->bitstream_buffer)
733 return AVERROR(ENOMEM);
734 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
735 s->bitstream_buffer_size= buf_size - current_pos;
742 if (avctx->hwaccel) {
743 if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
749 assert(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
750 assert(s->current_picture.f.pict_type == s->pict_type);
751 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
752 *pict = s->current_picture_ptr->f;
753 } else if (s->last_picture_ptr != NULL) {
754 *pict = s->last_picture_ptr->f;
757 if(s->last_picture_ptr || s->low_delay){
759 ff_print_debug_info(s, pict);
762 #ifdef PRINT_FRAME_TIME
763 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
766 return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
769 AVCodec ff_h263_decoder = {
771 .type = AVMEDIA_TYPE_VIDEO,
772 .id = AV_CODEC_ID_H263,
773 .priv_data_size = sizeof(MpegEncContext),
774 .init = ff_h263_decode_init,
775 .close = ff_h263_decode_end,
776 .decode = ff_h263_decode_frame,
777 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
778 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
779 .flush = ff_mpeg_flush,
781 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
782 .pix_fmts = ff_hwaccel_pixfmt_list_420,
785 AVCodec ff_h263p_decoder = {
787 .type = AVMEDIA_TYPE_VIDEO,
788 .id = AV_CODEC_ID_H263P,
789 .priv_data_size = sizeof(MpegEncContext),
790 .init = ff_h263_decode_init,
791 .close = ff_h263_decode_end,
792 .decode = ff_h263_decode_frame,
793 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
794 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
795 .flush = ff_mpeg_flush,
797 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
798 .pix_fmts = ff_hwaccel_pixfmt_list_420,