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"
39 #include "vdpau_internal.h"
42 #include "mpeg4video.h"
44 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
46 MpegEncContext *s = avctx->priv_data;
50 s->out_format = FMT_H263;
52 s->width = avctx->coded_width;
53 s->height = avctx->coded_height;
54 s->workaround_bugs= avctx->workaround_bugs;
57 ff_MPV_decode_defaults(s);
59 s->decode_mb= ff_h263_decode_mb;
61 if (avctx->codec->id == AV_CODEC_ID_MSS2)
62 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
64 avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
65 s->unrestricted_mv= 1;
67 /* select sub codec */
68 switch(avctx->codec->id) {
69 case AV_CODEC_ID_H263:
70 case AV_CODEC_ID_H263P:
71 s->unrestricted_mv= 0;
72 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
74 case AV_CODEC_ID_MPEG4:
76 case AV_CODEC_ID_MSMPEG4V1:
80 case AV_CODEC_ID_MSMPEG4V2:
84 case AV_CODEC_ID_MSMPEG4V3:
88 case AV_CODEC_ID_WMV1:
92 case AV_CODEC_ID_WMV2:
97 case AV_CODEC_ID_WMV3:
98 case AV_CODEC_ID_VC1IMAGE:
99 case AV_CODEC_ID_WMV3IMAGE:
100 case AV_CODEC_ID_MSS2:
102 s->msmpeg4_version=6;
103 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
105 case AV_CODEC_ID_H263I:
107 case AV_CODEC_ID_FLV1:
111 return AVERROR(EINVAL);
113 s->codec_id= avctx->codec->id;
114 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
116 /* for h263, we allocate the images after having read the header */
117 if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
118 if ((ret = ff_MPV_common_init(s)) < 0)
121 ff_h263_decode_init_vlc();
126 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
128 MpegEncContext *s = avctx->priv_data;
130 ff_MPV_common_end(s);
135 * Return the number of bytes consumed for building the current frame.
137 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
138 int pos= (get_bits_count(&s->gb)+7)>>3;
140 if(s->divx_packed || s->avctx->hwaccel){
141 //we would have to scan through the whole buf to handle the weird reordering ...
143 }else if(s->flags&CODEC_FLAG_TRUNCATED){
144 pos -= s->parse_context.last_index;
145 if(pos<0) pos=0; // padding is not really read so this might be -1
148 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
149 if(pos+10>buf_size) pos=buf_size; // oops ;)
155 static int decode_slice(MpegEncContext *s){
156 const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
157 const int mb_size= 16>>s->avctx->lowres;
160 s->last_resync_gb= s->gb;
161 s->first_slice_line= 1;
163 s->resync_mb_x= s->mb_x;
164 s->resync_mb_y= s->mb_y;
166 ff_set_qscale(s, s->qscale);
168 if (s->avctx->hwaccel) {
169 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
170 const uint8_t *end = ff_h263_find_resync_marker(s, start + 1, s->gb.buffer_end);
171 skip_bits_long(&s->gb, 8*(end - start));
172 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
175 if(s->partitioned_frame){
176 const int qscale= s->qscale;
178 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
179 if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
183 /* restore variables which were modified */
184 s->first_slice_line=1;
185 s->mb_x= s->resync_mb_x;
186 s->mb_y= s->resync_mb_y;
187 ff_set_qscale(s, qscale);
190 for(; s->mb_y < s->mb_height; s->mb_y++) {
191 /* per-row end of slice checks */
192 if(s->msmpeg4_version){
193 if(s->resync_mb_y + s->slice_height == s->mb_y){
194 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
200 if(s->msmpeg4_version==1){
206 ff_init_block_index(s);
207 for(; s->mb_x < s->mb_width; s->mb_x++) {
210 ff_update_block_index(s);
212 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
213 s->first_slice_line=0;
218 s->mv_dir = MV_DIR_FORWARD;
219 s->mv_type = MV_TYPE_16X16;
220 // s->mb_skipped = 0;
221 av_dlog(s, "%d %d %06X\n",
222 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
223 ret= s->decode_mb(s, s->block);
225 if (s->pict_type!=AV_PICTURE_TYPE_B)
226 ff_h263_update_motion_val(s);
229 const int xy= s->mb_x + s->mb_y*s->mb_stride;
231 ff_MPV_decode_mb(s, s->block);
233 ff_h263_loop_filter(s);
235 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);
237 s->padding_bug_score--;
239 if(++s->mb_x >= s->mb_width){
241 ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
242 ff_MPV_report_decode_progress(s);
246 }else if(ret==SLICE_NOEND){
247 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
248 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);
249 return AVERROR_INVALIDDATA;
251 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
252 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);
254 return AVERROR_INVALIDDATA;
257 ff_MPV_decode_mb(s, s->block);
259 ff_h263_loop_filter(s);
262 ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
263 ff_MPV_report_decode_progress(s);
268 av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
270 if(s->codec_id==AV_CODEC_ID_MPEG4
271 && (s->workaround_bugs&FF_BUG_AUTODETECT)
272 && get_bits_left(&s->gb) >= 48
273 && show_bits(&s->gb, 24)==0x4010
274 && !s->data_partitioning)
275 s->padding_bug_score+=32;
277 /* try to detect the padding bug */
278 if( s->codec_id==AV_CODEC_ID_MPEG4
279 && (s->workaround_bugs&FF_BUG_AUTODETECT)
280 && get_bits_left(&s->gb) >=0
281 && get_bits_left(&s->gb) < 137
282 // && !s->resync_marker
283 && !s->data_partitioning){
285 const int bits_count= get_bits_count(&s->gb);
286 const int bits_left = s->gb.size_in_bits - bits_count;
289 s->padding_bug_score+=16;
290 } else if(bits_left != 1){
291 int v= show_bits(&s->gb, 8);
292 v|= 0x7F >> (7-(bits_count&7));
294 if(v==0x7F && bits_left<=8)
295 s->padding_bug_score--;
296 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
297 s->padding_bug_score+= 4;
299 s->padding_bug_score++;
303 if(s->workaround_bugs&FF_BUG_AUTODETECT){
304 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
305 s->workaround_bugs |= FF_BUG_NO_PADDING;
307 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
310 // handle formats which don't have unique end markers
311 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
312 int left= get_bits_left(&s->gb);
315 /* no markers in M$ crap */
316 if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
319 /* buggy padding but the frame should still end approximately at the bitstream end */
320 if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
322 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
323 max_extra+= 256*256*256*64;
326 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
329 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
331 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
336 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
337 get_bits_left(&s->gb),
338 show_bits(&s->gb, 24), s->padding_bug_score);
340 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);
342 return AVERROR_INVALIDDATA;
345 int ff_h263_decode_frame(AVCodecContext *avctx,
346 void *data, int *got_frame,
349 const uint8_t *buf = avpkt->data;
350 int buf_size = avpkt->size;
351 MpegEncContext *s = avctx->priv_data;
353 AVFrame *pict = data;
355 s->flags= avctx->flags;
356 s->flags2= avctx->flags2;
358 /* no supplementary picture */
360 /* special case for last picture */
361 if (s->low_delay==0 && s->next_picture_ptr) {
362 if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
364 s->next_picture_ptr= NULL;
372 if(s->flags&CODEC_FLAG_TRUNCATED){
375 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
376 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
377 }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
378 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
379 }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
380 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
382 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
383 return AVERROR(EINVAL);
386 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
392 if(s->divx_packed && s->bitstream_buffer_size){
394 for(i=0; i<buf_size-3; i++){
395 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
397 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
398 s->bitstream_buffer_size=0;
405 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
406 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
408 init_get_bits(&s->gb, buf, buf_size*8);
409 s->bitstream_buffer_size=0;
411 if (!s->context_initialized) {
412 if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
416 /* We need to set current_picture_ptr before reading the header,
417 * otherwise we cannot store anyting in there */
418 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
419 int i= ff_find_unused_picture(s, 0);
422 s->current_picture_ptr= &s->picture[i];
426 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
427 ret= ff_wmv2_decode_picture_header(s);
428 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
429 ret = ff_msmpeg4_decode_picture_header(s);
430 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
431 if(s->avctx->extradata_size && s->picture_number==0){
434 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
435 ret = ff_mpeg4_decode_picture_header(s, &gb);
437 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
438 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
439 ret = ff_intel_h263_decode_picture_header(s);
440 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
441 ret = ff_flv_decode_picture_header(s);
443 ret = ff_h263_decode_picture_header(s);
446 if (ret < 0 || ret==FRAME_SKIPPED) {
447 if ( s->width != avctx->coded_width
448 || s->height != avctx->coded_height) {
449 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
450 s->width = avctx->coded_width;
451 s->height= avctx->coded_height;
454 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
456 /* skip if the header was thrashed */
458 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
462 avctx->has_b_frames= !s->low_delay;
464 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
465 if(s->stream_codec_tag == AV_RL32("XVID") ||
466 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
467 s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") ||
468 s->codec_tag == AV_RL32("SIPP")
472 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
473 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
478 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
479 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
480 s->divx_version= 400; //divx 4
483 if(s->xvid_build>=0 && s->divx_version>=0){
488 if(s->workaround_bugs&FF_BUG_AUTODETECT){
489 if(s->codec_tag == AV_RL32("XVIX"))
490 s->workaround_bugs|= FF_BUG_XVID_ILACE;
492 if(s->codec_tag == AV_RL32("UMP4")){
493 s->workaround_bugs|= FF_BUG_UMP4;
496 if(s->divx_version>=500 && s->divx_build<1814){
497 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
500 if(s->divx_version>502 && s->divx_build<1814){
501 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
504 if(s->xvid_build<=3U)
505 s->padding_bug_score= 256*256*256*64;
507 if(s->xvid_build<=1U)
508 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
510 if(s->xvid_build<=12U)
511 s->workaround_bugs|= FF_BUG_EDGE;
513 if(s->xvid_build<=32U)
514 s->workaround_bugs|= FF_BUG_DC_CLIP;
516 #define SET_QPEL_FUNC(postfix1, postfix2) \
517 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
518 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
519 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
521 if(s->lavc_build<4653U)
522 s->workaround_bugs|= FF_BUG_STD_QPEL;
524 if(s->lavc_build<4655U)
525 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
527 if(s->lavc_build<4670U){
528 s->workaround_bugs|= FF_BUG_EDGE;
531 if(s->lavc_build<=4712U)
532 s->workaround_bugs|= FF_BUG_DC_CLIP;
534 if(s->divx_version>=0)
535 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
536 if(s->divx_version==501 && s->divx_build==20020416)
537 s->padding_bug_score= 256*256*256*64;
539 if(s->divx_version<500U){
540 s->workaround_bugs|= FF_BUG_EDGE;
543 if(s->divx_version>=0)
544 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
546 if(s->divx_version==500)
547 s->padding_bug_score= 256*256*256*64;
549 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
550 * Let us hope this at least works.
552 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
553 && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
554 s->workaround_bugs|= FF_BUG_NO_PADDING;
556 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
557 s->workaround_bugs|= FF_BUG_NO_PADDING;
561 if(s->workaround_bugs& FF_BUG_STD_QPEL){
562 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
563 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
564 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
565 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
566 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
567 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
569 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
570 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
571 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
572 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
573 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
574 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
577 if(avctx->debug & FF_DEBUG_BUGS)
578 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
579 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
580 s->divx_packed ? "p" : "");
583 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)) {
584 avctx->idct_algo= FF_IDCT_XVIDMMX;
585 ff_dct_common_init(s);
590 /* After H263 & mpeg4 header decode we have the height, width,*/
591 /* and other parameters. So then we could init the picture */
592 /* FIXME: By the way H263 decoder is evolving it should have */
593 /* an H263EncContext */
595 if ((!avctx->coded_width || !avctx->coded_height) && 0) {
596 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
598 s->parse_context.buffer=0;
599 ff_MPV_common_end(s);
600 s->parse_context= pc;
601 avcodec_set_dimensions(avctx, s->width, s->height);
606 if (s->width != avctx->coded_width ||
607 s->height != avctx->coded_height ||
609 /* H.263 could change picture size any time */
610 s->context_reinit = 0;
612 avcodec_set_dimensions(avctx, s->width, s->height);
614 if ((ret = ff_MPV_common_frame_size_change(s)))
618 if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
619 s->gob_index = ff_h263_get_gob_height(s);
621 // for skipping the frame
622 s->current_picture.f.pict_type = s->pict_type;
623 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
625 /* skip B-frames if we don't have reference frames */
626 if (s->last_picture_ptr == NULL &&
627 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
628 return get_consumed_bytes(s, buf_size);
629 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
630 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
631 || avctx->skip_frame >= AVDISCARD_ALL)
632 return get_consumed_bytes(s, buf_size);
634 if(s->next_p_frame_damaged){
635 if(s->pict_type==AV_PICTURE_TYPE_B)
636 return get_consumed_bytes(s, buf_size);
638 s->next_p_frame_damaged=0;
641 if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
642 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
643 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
645 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
646 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
649 if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
652 if (!s->divx_packed && !avctx->hwaccel)
653 ff_thread_finish_setup(avctx);
655 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
656 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
660 if (avctx->hwaccel) {
661 if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
665 ff_mpeg_er_frame_start(s);
667 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
668 //which is not available before ff_MPV_frame_start()
669 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
670 ret = ff_wmv2_decode_secondary_picture_header(s);
671 if(ret<0) return ret;
672 if(ret==1) goto intrax8_decoded;
675 /* decode each macroblock */
679 ret = decode_slice(s);
680 while(s->mb_y<s->mb_height){
681 if(s->msmpeg4_version){
682 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
685 int prev_x=s->mb_x, prev_y=s->mb_y;
686 if(ff_h263_resync(s)<0)
688 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
689 s->er.error_occurred = 1;
692 if(s->msmpeg4_version<4 && s->h263_pred)
693 ff_mpeg4_clean_buffers(s);
695 if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
698 if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
699 if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
700 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
703 av_assert1(s->bitstream_buffer_size==0);
705 /* divx 5.01+ bitstream reorder stuff */
706 if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
707 int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
708 int startcode_found=0;
710 if(buf_size - current_pos > 7){
712 for(i=current_pos; i<buf_size-4; i++){
713 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
714 startcode_found=!(buf[i+4]&0x40);
722 &s->bitstream_buffer,
723 &s->allocated_bitstream_buffer_size,
724 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
725 if (!s->bitstream_buffer)
726 return AVERROR(ENOMEM);
727 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
728 s->bitstream_buffer_size= buf_size - current_pos;
733 ff_er_frame_end(&s->er);
735 if (avctx->hwaccel) {
736 if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
742 if (!s->divx_packed && avctx->hwaccel)
743 ff_thread_finish_setup(avctx);
745 av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
746 av_assert1(s->current_picture.f.pict_type == s->pict_type);
747 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
748 if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
750 ff_print_debug_info(s, s->current_picture_ptr, pict);
751 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
752 } else if (s->last_picture_ptr != NULL) {
753 if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
755 ff_print_debug_info(s, s->last_picture_ptr, pict);
756 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
759 if(s->last_picture_ptr || s->low_delay){
763 return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
766 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
768 AV_PIX_FMT_VAAPI_VLD,
777 AVCodec ff_h263_decoder = {
779 .type = AVMEDIA_TYPE_VIDEO,
780 .id = AV_CODEC_ID_H263,
781 .priv_data_size = sizeof(MpegEncContext),
782 .init = ff_h263_decode_init,
783 .close = ff_h263_decode_end,
784 .decode = ff_h263_decode_frame,
785 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
786 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
787 .flush = ff_mpeg_flush,
789 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
790 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
793 AVCodec ff_h263p_decoder = {
795 .type = AVMEDIA_TYPE_VIDEO,
796 .id = AV_CODEC_ID_H263P,
797 .priv_data_size = sizeof(MpegEncContext),
798 .init = ff_h263_decode_init,
799 .close = ff_h263_decode_end,
800 .decode = ff_h263_decode_frame,
801 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
802 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
803 .flush = ff_mpeg_flush,
805 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
806 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,