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"
33 #include "error_resilience.h"
34 #include "mpegvideo.h"
36 #include "h263_parser.h"
37 #include "mpeg4video_parser.h"
41 #include "mpeg4video.h"
43 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
45 MpegEncContext *s = avctx->priv_data;
49 s->out_format = FMT_H263;
51 s->width = avctx->coded_width;
52 s->height = avctx->coded_height;
53 s->workaround_bugs= avctx->workaround_bugs;
56 ff_MPV_decode_defaults(s);
58 s->decode_mb= ff_h263_decode_mb;
60 if (avctx->codec->id == AV_CODEC_ID_MSS2)
61 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
63 avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
64 s->unrestricted_mv= 1;
66 /* select sub codec */
67 switch(avctx->codec->id) {
68 case AV_CODEC_ID_H263:
69 case AV_CODEC_ID_H263P:
70 s->unrestricted_mv= 0;
71 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
73 case AV_CODEC_ID_MPEG4:
75 case AV_CODEC_ID_MSMPEG4V1:
79 case AV_CODEC_ID_MSMPEG4V2:
83 case AV_CODEC_ID_MSMPEG4V3:
87 case AV_CODEC_ID_WMV1:
91 case AV_CODEC_ID_WMV2:
96 case AV_CODEC_ID_WMV3:
97 case AV_CODEC_ID_VC1IMAGE:
98 case AV_CODEC_ID_WMV3IMAGE:
99 case AV_CODEC_ID_MSS2:
101 s->msmpeg4_version=6;
102 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
104 case AV_CODEC_ID_H263I:
106 case AV_CODEC_ID_FLV1:
110 return AVERROR(EINVAL);
112 s->codec_id= avctx->codec->id;
113 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
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_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
117 if ((ret = ff_MPV_common_init(s)) < 0)
120 ff_h263_decode_init_vlc();
125 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
127 MpegEncContext *s = avctx->priv_data;
129 ff_MPV_common_end(s);
134 * Return the number of bytes consumed for building the current frame.
136 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
137 int pos= (get_bits_count(&s->gb)+7)>>3;
139 if(s->divx_packed || s->avctx->hwaccel){
140 //we would have to scan through the whole buf to handle the weird reordering ...
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
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 ;)
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>>s->avctx->lowres;
159 s->last_resync_gb= s->gb;
160 s->first_slice_line= 1;
162 s->resync_mb_x= s->mb_x;
163 s->resync_mb_y= s->mb_y;
165 ff_set_qscale(s, s->qscale);
167 if (s->avctx->hwaccel) {
168 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
169 const uint8_t *end = ff_h263_find_resync_marker(s, start + 1, s->gb.buffer_end);
170 skip_bits_long(&s->gb, 8*(end - start));
171 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
174 if(s->partitioned_frame){
175 const int qscale= s->qscale;
177 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
178 if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
182 /* restore variables which were modified */
183 s->first_slice_line=1;
184 s->mb_x= s->resync_mb_x;
185 s->mb_y= s->resync_mb_y;
186 ff_set_qscale(s, qscale);
189 for(; s->mb_y < s->mb_height; s->mb_y++) {
190 /* per-row end of slice checks */
191 if(s->msmpeg4_version){
192 if(s->resync_mb_y + s->slice_height == s->mb_y){
193 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
199 if(s->msmpeg4_version==1){
205 ff_init_block_index(s);
206 for(; s->mb_x < s->mb_width; s->mb_x++) {
209 ff_update_block_index(s);
211 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
212 s->first_slice_line=0;
217 s->mv_dir = MV_DIR_FORWARD;
218 s->mv_type = MV_TYPE_16X16;
219 // s->mb_skipped = 0;
220 av_dlog(s, "%d %d %06X\n",
221 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
222 ret= s->decode_mb(s, s->block);
224 if (s->pict_type!=AV_PICTURE_TYPE_B)
225 ff_h263_update_motion_val(s);
228 const int xy= s->mb_x + s->mb_y*s->mb_stride;
230 ff_MPV_decode_mb(s, s->block);
232 ff_h263_loop_filter(s);
234 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
236 s->padding_bug_score--;
238 if(++s->mb_x >= s->mb_width){
240 ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
241 ff_MPV_report_decode_progress(s);
245 }else if(ret==SLICE_NOEND){
246 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
247 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
248 return AVERROR_INVALIDDATA;
250 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
251 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
253 return AVERROR_INVALIDDATA;
256 ff_MPV_decode_mb(s, s->block);
258 ff_h263_loop_filter(s);
261 ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
262 ff_MPV_report_decode_progress(s);
267 av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
269 if(s->codec_id==AV_CODEC_ID_MPEG4
270 && (s->workaround_bugs&FF_BUG_AUTODETECT)
271 && get_bits_left(&s->gb) >= 48
272 && show_bits(&s->gb, 24)==0x4010
273 && !s->data_partitioning)
274 s->padding_bug_score+=32;
276 /* try to detect the padding bug */
277 if( s->codec_id==AV_CODEC_ID_MPEG4
278 && (s->workaround_bugs&FF_BUG_AUTODETECT)
279 && get_bits_left(&s->gb) >=0
280 && get_bits_left(&s->gb) < 137
281 // && !s->resync_marker
282 && !s->data_partitioning){
284 const int bits_count= get_bits_count(&s->gb);
285 const int bits_left = s->gb.size_in_bits - bits_count;
288 s->padding_bug_score+=16;
289 } else if(bits_left != 1){
290 int v= show_bits(&s->gb, 8);
291 v|= 0x7F >> (7-(bits_count&7));
293 if(v==0x7F && bits_left<=8)
294 s->padding_bug_score--;
295 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
296 s->padding_bug_score+= 4;
298 s->padding_bug_score++;
302 if(s->workaround_bugs&FF_BUG_AUTODETECT){
303 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
304 s->workaround_bugs |= FF_BUG_NO_PADDING;
306 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
309 // handle formats which don't have unique end markers
310 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
311 int left= get_bits_left(&s->gb);
314 /* no markers in M$ crap */
315 if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
318 /* buggy padding but the frame should still end approximately at the bitstream end */
319 if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
321 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
322 max_extra+= 256*256*256*64;
325 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
328 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
330 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
335 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
336 get_bits_left(&s->gb),
337 show_bits(&s->gb, 24), s->padding_bug_score);
339 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
341 return AVERROR_INVALIDDATA;
344 int ff_h263_decode_frame(AVCodecContext *avctx,
345 void *data, int *got_frame,
348 const uint8_t *buf = avpkt->data;
349 int buf_size = avpkt->size;
350 MpegEncContext *s = avctx->priv_data;
352 AVFrame *pict = data;
354 s->flags= avctx->flags;
355 s->flags2= avctx->flags2;
357 /* no supplementary picture */
359 /* special case for last picture */
360 if (s->low_delay==0 && s->next_picture_ptr) {
361 if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
363 s->next_picture_ptr= NULL;
371 if(s->flags&CODEC_FLAG_TRUNCATED){
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 if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
379 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
381 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
382 return AVERROR(EINVAL);
385 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
391 if(s->divx_packed && s->bitstream_buffer_size){
393 for(i=0; i<buf_size-3; i++){
394 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
396 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
397 s->bitstream_buffer_size=0;
404 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
405 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
407 init_get_bits(&s->gb, buf, buf_size*8);
408 s->bitstream_buffer_size=0;
410 if (!s->context_initialized) {
411 if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
415 /* We need to set current_picture_ptr before reading the header,
416 * otherwise we cannot store anyting in there */
417 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
418 int i= ff_find_unused_picture(s, 0);
421 s->current_picture_ptr= &s->picture[i];
425 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
426 ret= ff_wmv2_decode_picture_header(s);
427 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
428 ret = ff_msmpeg4_decode_picture_header(s);
429 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
430 if(s->avctx->extradata_size && s->picture_number==0){
433 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
434 ret = ff_mpeg4_decode_picture_header(s, &gb);
436 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
437 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
438 ret = ff_intel_h263_decode_picture_header(s);
439 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
440 ret = ff_flv_decode_picture_header(s);
442 ret = ff_h263_decode_picture_header(s);
445 if (ret < 0 || ret==FRAME_SKIPPED) {
446 if ( s->width != avctx->coded_width
447 || s->height != avctx->coded_height) {
448 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
449 s->width = avctx->coded_width;
450 s->height= avctx->coded_height;
453 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
455 /* skip if the header was thrashed */
457 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
461 avctx->has_b_frames= !s->low_delay;
463 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
464 if(s->stream_codec_tag == AV_RL32("XVID") ||
465 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
466 s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") ||
467 s->codec_tag == AV_RL32("SIPP")
471 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
472 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
477 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
478 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
479 s->divx_version= 400; //divx 4
482 if(s->xvid_build>=0 && s->divx_version>=0){
487 if(s->workaround_bugs&FF_BUG_AUTODETECT){
488 if(s->codec_tag == AV_RL32("XVIX"))
489 s->workaround_bugs|= FF_BUG_XVID_ILACE;
491 if(s->codec_tag == AV_RL32("UMP4")){
492 s->workaround_bugs|= FF_BUG_UMP4;
495 if(s->divx_version>=500 && s->divx_build<1814){
496 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
499 if(s->divx_version>502 && s->divx_build<1814){
500 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
503 if(s->xvid_build<=3U)
504 s->padding_bug_score= 256*256*256*64;
506 if(s->xvid_build<=1U)
507 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
509 if(s->xvid_build<=12U)
510 s->workaround_bugs|= FF_BUG_EDGE;
512 if(s->xvid_build<=32U)
513 s->workaround_bugs|= FF_BUG_DC_CLIP;
515 #define SET_QPEL_FUNC(postfix1, postfix2) \
516 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
517 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
518 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
520 if(s->lavc_build<4653U)
521 s->workaround_bugs|= FF_BUG_STD_QPEL;
523 if(s->lavc_build<4655U)
524 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
526 if(s->lavc_build<4670U){
527 s->workaround_bugs|= FF_BUG_EDGE;
530 if(s->lavc_build<=4712U)
531 s->workaround_bugs|= FF_BUG_DC_CLIP;
533 if(s->divx_version>=0)
534 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
535 if(s->divx_version==501 && s->divx_build==20020416)
536 s->padding_bug_score= 256*256*256*64;
538 if(s->divx_version<500U){
539 s->workaround_bugs|= FF_BUG_EDGE;
542 if(s->divx_version>=0)
543 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
545 if(s->divx_version==500)
546 s->padding_bug_score= 256*256*256*64;
548 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
549 * Let us hope this at least works.
551 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
552 && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
553 s->workaround_bugs|= FF_BUG_NO_PADDING;
555 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
556 s->workaround_bugs|= FF_BUG_NO_PADDING;
560 if(s->workaround_bugs& FF_BUG_STD_QPEL){
561 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
562 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
563 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
564 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
565 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
566 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
568 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
569 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
570 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
571 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
572 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
573 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
576 if(avctx->debug & FF_DEBUG_BUGS)
577 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
578 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
579 s->divx_packed ? "p" : "");
582 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)) {
583 avctx->idct_algo= FF_IDCT_XVIDMMX;
584 ff_dct_common_init(s);
589 /* After H263 & mpeg4 header decode we have the height, width,*/
590 /* and other parameters. So then we could init the picture */
591 /* FIXME: By the way H263 decoder is evolving it should have */
592 /* an H263EncContext */
594 if ((!avctx->coded_width || !avctx->coded_height) && 0) {
595 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
597 s->parse_context.buffer=0;
598 ff_MPV_common_end(s);
599 s->parse_context= pc;
600 avcodec_set_dimensions(avctx, s->width, s->height);
605 if (s->width != avctx->coded_width ||
606 s->height != avctx->coded_height ||
608 /* H.263 could change picture size any time */
609 s->context_reinit = 0;
611 avcodec_set_dimensions(avctx, s->width, s->height);
613 if ((ret = ff_MPV_common_frame_size_change(s)))
617 if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
618 s->gob_index = ff_h263_get_gob_height(s);
620 // for skipping the frame
621 s->current_picture.f.pict_type = s->pict_type;
622 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
624 /* skip B-frames if we don't have reference frames */
625 if (s->last_picture_ptr == NULL &&
626 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
627 return get_consumed_bytes(s, buf_size);
628 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
629 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
630 || avctx->skip_frame >= AVDISCARD_ALL)
631 return get_consumed_bytes(s, buf_size);
633 if(s->next_p_frame_damaged){
634 if(s->pict_type==AV_PICTURE_TYPE_B)
635 return get_consumed_bytes(s, buf_size);
637 s->next_p_frame_damaged=0;
640 if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
641 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
642 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
644 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
645 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
648 if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
651 if (!s->divx_packed && !avctx->hwaccel)
652 ff_thread_finish_setup(avctx);
654 if (avctx->hwaccel) {
655 if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
659 ff_mpeg_er_frame_start(s);
661 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
662 //which is not available before ff_MPV_frame_start()
663 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
664 ret = ff_wmv2_decode_secondary_picture_header(s);
665 if(ret<0) return ret;
666 if(ret==1) goto intrax8_decoded;
669 /* decode each macroblock */
673 ret = decode_slice(s);
674 while(s->mb_y<s->mb_height){
675 if(s->msmpeg4_version){
676 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
679 int prev_x=s->mb_x, prev_y=s->mb_y;
680 if(ff_h263_resync(s)<0)
682 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
683 s->er.error_occurred = 1;
686 if(s->msmpeg4_version<4 && s->h263_pred)
687 ff_mpeg4_clean_buffers(s);
689 if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
692 if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
693 if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
694 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
697 av_assert1(s->bitstream_buffer_size==0);
698 /* divx 5.01+ bitstream reorder stuff */
699 if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
700 int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
701 int startcode_found=0;
703 if(buf_size - current_pos > 7){
705 for(i=current_pos; i<buf_size-4; i++){
706 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
707 startcode_found=!(buf[i+4]&0x40);
715 &s->bitstream_buffer,
716 &s->allocated_bitstream_buffer_size,
717 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
718 if (!s->bitstream_buffer)
719 return AVERROR(ENOMEM);
720 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
721 s->bitstream_buffer_size= buf_size - current_pos;
726 ff_er_frame_end(&s->er);
728 if (avctx->hwaccel) {
729 if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
735 if (!s->divx_packed && avctx->hwaccel)
736 ff_thread_finish_setup(avctx);
738 av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
739 av_assert1(s->current_picture.f.pict_type == s->pict_type);
740 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
741 if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
743 ff_print_debug_info(s, s->current_picture_ptr, pict);
744 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
745 } else if (s->last_picture_ptr != NULL) {
746 if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
748 ff_print_debug_info(s, s->last_picture_ptr, pict);
749 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
752 if(s->last_picture_ptr || s->low_delay){
756 return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
759 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
761 AV_PIX_FMT_VAAPI_VLD,
770 AVCodec ff_h263_decoder = {
772 .type = AVMEDIA_TYPE_VIDEO,
773 .id = AV_CODEC_ID_H263,
774 .priv_data_size = sizeof(MpegEncContext),
775 .init = ff_h263_decode_init,
776 .close = ff_h263_decode_end,
777 .decode = ff_h263_decode_frame,
778 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
779 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
780 .flush = ff_mpeg_flush,
782 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
783 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
786 AVCodec ff_h263p_decoder = {
788 .type = AVMEDIA_TYPE_VIDEO,
789 .id = AV_CODEC_ID_H263P,
790 .priv_data_size = sizeof(MpegEncContext),
791 .init = ff_h263_decode_init,
792 .close = ff_h263_decode_end,
793 .decode = ff_h263_decode_frame,
794 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
795 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
796 .flush = ff_mpeg_flush,
798 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
799 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,