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 #include "libavutil/cpu.h"
32 #include "mpegvideo.h"
34 #include "h263_parser.h"
35 #include "mpeg4video_parser.h"
37 #include "vdpau_internal.h"
40 #include "mpeg4video.h"
43 //#define PRINT_FRAME_TIME
45 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
47 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 MPV_decode_defaults(s);
59 s->decode_mb= ff_h263_decode_mb;
61 avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
62 s->unrestricted_mv= 1;
64 /* select sub codec */
65 switch(avctx->codec->id) {
67 s->unrestricted_mv= 0;
68 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
72 case CODEC_ID_MSMPEG4V1:
76 case CODEC_ID_MSMPEG4V2:
80 case CODEC_ID_MSMPEG4V3:
96 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
106 s->codec_id= avctx->codec->id;
107 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
109 /* for h263, we allocate the images after having read the header */
110 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
111 if (MPV_common_init(s) < 0)
114 h263_decode_init_vlc(s);
119 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
121 MpegEncContext *s = avctx->priv_data;
128 * returns the number of bytes consumed for building the current frame
130 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
131 int pos= (get_bits_count(&s->gb)+7)>>3;
133 if(s->divx_packed || s->avctx->hwaccel){
134 //we would have to scan through the whole buf to handle the weird reordering ...
136 }else if(s->flags&CODEC_FLAG_TRUNCATED){
137 pos -= s->parse_context.last_index;
138 if(pos<0) pos=0; // padding is not really read so this might be -1
141 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
142 if(pos+10>buf_size) pos=buf_size; // oops ;)
148 static int decode_slice(MpegEncContext *s){
149 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
150 const int mb_size= 16>>s->avctx->lowres;
151 s->last_resync_gb= s->gb;
152 s->first_slice_line= 1;
154 s->resync_mb_x= s->mb_x;
155 s->resync_mb_y= s->mb_y;
157 ff_set_qscale(s, s->qscale);
159 if (s->avctx->hwaccel) {
160 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
161 const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
162 skip_bits_long(&s->gb, 8*(end - start));
163 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
166 if(s->partitioned_frame){
167 const int qscale= s->qscale;
169 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
170 if(ff_mpeg4_decode_partitions(s) < 0)
174 /* restore variables which were modified */
175 s->first_slice_line=1;
176 s->mb_x= s->resync_mb_x;
177 s->mb_y= s->resync_mb_y;
178 ff_set_qscale(s, qscale);
181 for(; s->mb_y < s->mb_height; s->mb_y++) {
182 /* per-row end of slice checks */
183 if(s->msmpeg4_version){
184 if(s->resync_mb_y + s->slice_height == s->mb_y){
185 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
191 if(s->msmpeg4_version==1){
197 ff_init_block_index(s);
198 for(; s->mb_x < s->mb_width; s->mb_x++) {
201 ff_update_block_index(s);
203 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
204 s->first_slice_line=0;
209 s->mv_dir = MV_DIR_FORWARD;
210 s->mv_type = MV_TYPE_16X16;
211 // s->mb_skipped = 0;
212 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
213 ret= s->decode_mb(s, s->block);
215 if (s->pict_type!=AV_PICTURE_TYPE_B)
216 ff_h263_update_motion_val(s);
219 const int xy= s->mb_x + s->mb_y*s->mb_stride;
221 MPV_decode_mb(s, s->block);
223 ff_h263_loop_filter(s);
225 //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));
226 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
228 s->padding_bug_score--;
230 if(++s->mb_x >= s->mb_width){
232 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
233 MPV_report_decode_progress(s);
237 }else if(ret==SLICE_NOEND){
238 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
239 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
242 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
243 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
248 MPV_decode_mb(s, s->block);
250 ff_h263_loop_filter(s);
253 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
254 MPV_report_decode_progress(s);
259 assert(s->mb_x==0 && s->mb_y==s->mb_height);
261 if(s->codec_id==CODEC_ID_MPEG4
262 && (s->workaround_bugs&FF_BUG_AUTODETECT)
263 && get_bits_left(&s->gb) >= 48
264 && show_bits(&s->gb, 24)==0x4010
265 && !s->data_partitioning)
266 s->padding_bug_score+=32;
268 /* try to detect the padding bug */
269 if( s->codec_id==CODEC_ID_MPEG4
270 && (s->workaround_bugs&FF_BUG_AUTODETECT)
271 && get_bits_left(&s->gb) >=0
272 && get_bits_left(&s->gb) < 137
273 // && !s->resync_marker
274 && !s->data_partitioning){
276 const int bits_count= get_bits_count(&s->gb);
277 const int bits_left = s->gb.size_in_bits - bits_count;
280 s->padding_bug_score+=16;
281 } else if(bits_left != 1){
282 int v= show_bits(&s->gb, 8);
283 v|= 0x7F >> (7-(bits_count&7));
285 if(v==0x7F && bits_left<=8)
286 s->padding_bug_score--;
287 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
288 s->padding_bug_score+= 4;
290 s->padding_bug_score++;
294 if(s->workaround_bugs&FF_BUG_AUTODETECT){
295 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
296 s->workaround_bugs |= FF_BUG_NO_PADDING;
298 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
301 // handle formats which don't have unique end markers
302 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
303 int left= get_bits_left(&s->gb);
306 /* no markers in M$ crap */
307 if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
310 /* buggy padding but the frame should still end approximately at the bitstream end */
311 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
313 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
314 max_extra+= 256*256*256*64;
317 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 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
322 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
327 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
328 get_bits_left(&s->gb),
329 show_bits(&s->gb, 24), s->padding_bug_score);
331 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
336 int ff_h263_decode_frame(AVCodecContext *avctx,
337 void *data, int *data_size,
340 const uint8_t *buf = avpkt->data;
341 int buf_size = avpkt->size;
342 MpegEncContext *s = avctx->priv_data;
344 AVFrame *pict = data;
346 #ifdef PRINT_FRAME_TIME
347 uint64_t time= rdtsc();
349 s->flags= avctx->flags;
350 s->flags2= avctx->flags2;
352 /* no supplementary picture */
354 /* special case for last picture */
355 if (s->low_delay==0 && s->next_picture_ptr) {
356 *pict= *(AVFrame*)s->next_picture_ptr;
357 s->next_picture_ptr= NULL;
359 *data_size = sizeof(AVFrame);
365 if(s->flags&CODEC_FLAG_TRUNCATED){
368 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
369 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
370 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
371 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
373 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
377 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
383 if(s->divx_packed && s->xvid_build>=0 && s->bitstream_buffer_size){
385 for(i=0; i<buf_size-3; i++){
386 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
388 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
389 s->bitstream_buffer_size=0;
396 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
397 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
399 init_get_bits(&s->gb, buf, buf_size*8);
400 s->bitstream_buffer_size=0;
402 if (!s->context_initialized) {
403 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
407 /* We need to set current_picture_ptr before reading the header,
408 * otherwise we cannot store anyting in there */
409 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
410 int i= ff_find_unused_picture(s, 0);
411 s->current_picture_ptr= &s->picture[i];
415 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
416 ret= ff_wmv2_decode_picture_header(s);
417 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
418 ret = msmpeg4_decode_picture_header(s);
419 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
420 if(s->avctx->extradata_size && s->picture_number==0){
423 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
424 ret = ff_mpeg4_decode_picture_header(s, &gb);
426 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
427 } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
428 ret = ff_intel_h263_decode_picture_header(s);
429 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
430 ret = ff_flv_decode_picture_header(s);
432 ret = h263_decode_picture_header(s);
435 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
437 /* skip if the header was thrashed */
439 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
443 avctx->has_b_frames= !s->low_delay;
445 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
446 if(s->stream_codec_tag == AV_RL32("XVID") ||
447 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
448 s->codec_tag == AV_RL32("RMP4") ||
449 s->codec_tag == AV_RL32("SIPP")
453 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
454 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
459 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
460 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
461 s->divx_version= 400; //divx 4
464 if(s->xvid_build>=0 && s->divx_version>=0){
469 if(s->workaround_bugs&FF_BUG_AUTODETECT){
470 if(s->codec_tag == AV_RL32("XVIX"))
471 s->workaround_bugs|= FF_BUG_XVID_ILACE;
473 if(s->codec_tag == AV_RL32("UMP4")){
474 s->workaround_bugs|= FF_BUG_UMP4;
477 if(s->divx_version>=500 && s->divx_build<1814){
478 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
481 if(s->divx_version>502 && s->divx_build<1814){
482 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
485 if(s->xvid_build<=3U)
486 s->padding_bug_score= 256*256*256*64;
488 if(s->xvid_build<=1U)
489 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
491 if(s->xvid_build<=12U)
492 s->workaround_bugs|= FF_BUG_EDGE;
494 if(s->xvid_build<=32U)
495 s->workaround_bugs|= FF_BUG_DC_CLIP;
497 #define SET_QPEL_FUNC(postfix1, postfix2) \
498 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
499 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
500 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
502 if(s->lavc_build<4653U)
503 s->workaround_bugs|= FF_BUG_STD_QPEL;
505 if(s->lavc_build<4655U)
506 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
508 if(s->lavc_build<4670U){
509 s->workaround_bugs|= FF_BUG_EDGE;
512 if(s->lavc_build<=4712U)
513 s->workaround_bugs|= FF_BUG_DC_CLIP;
515 if(s->divx_version>=0)
516 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
517 //printf("padding_bug_score: %d\n", s->padding_bug_score);
518 if(s->divx_version==501 && s->divx_build==20020416)
519 s->padding_bug_score= 256*256*256*64;
521 if(s->divx_version<500U){
522 s->workaround_bugs|= FF_BUG_EDGE;
525 if(s->divx_version>=0)
526 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
528 if(s->divx_version==500)
529 s->padding_bug_score= 256*256*256*64;
531 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
532 * Let us hope this at least works.
534 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
535 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
536 s->workaround_bugs|= FF_BUG_NO_PADDING;
538 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
539 s->workaround_bugs|= FF_BUG_NO_PADDING;
543 if(s->workaround_bugs& FF_BUG_STD_QPEL){
544 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
545 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
546 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
547 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
548 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
549 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
551 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
552 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
553 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
554 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
555 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
556 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
559 if(avctx->debug & FF_DEBUG_BUGS)
560 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
561 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
562 s->divx_packed ? "p" : "");
565 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)) {
566 avctx->idct_algo= FF_IDCT_XVIDMMX;
567 avctx->coded_width= 0; // force reinit
568 // dsputil_init(&s->dsp, avctx);
573 /* After H263 & mpeg4 header decode we have the height, width,*/
574 /* and other parameters. So then we could init the picture */
575 /* FIXME: By the way H263 decoder is evolving it should have */
576 /* an H263EncContext */
578 if ( s->width != avctx->coded_width
579 || s->height != avctx->coded_height) {
580 /* H.263 could change picture size any time */
581 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
582 s->parse_context.buffer=0;
584 s->parse_context= pc;
586 if (!s->context_initialized) {
587 avcodec_set_dimensions(avctx, s->width, s->height);
592 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
593 s->gob_index = ff_h263_get_gob_height(s);
595 // for skipping the frame
596 s->current_picture.f.pict_type = s->pict_type;
597 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
599 /* skip B-frames if we don't have reference frames */
600 if(s->last_picture_ptr==NULL && (s->pict_type==AV_PICTURE_TYPE_B || s->dropable)) return get_consumed_bytes(s, buf_size);
601 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
602 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
603 || avctx->skip_frame >= AVDISCARD_ALL)
604 return get_consumed_bytes(s, buf_size);
606 if(s->next_p_frame_damaged){
607 if(s->pict_type==AV_PICTURE_TYPE_B)
608 return get_consumed_bytes(s, buf_size);
610 s->next_p_frame_damaged=0;
613 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==AV_PICTURE_TYPE_B){
614 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
615 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
616 }else if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
617 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
618 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
620 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
621 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
624 if(MPV_frame_start(s, avctx) < 0)
627 if (!s->divx_packed) ff_thread_finish_setup(avctx);
629 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
630 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
634 if (avctx->hwaccel) {
635 if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
639 ff_er_frame_start(s);
641 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
642 //which is not available before MPV_frame_start()
643 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
644 ret = ff_wmv2_decode_secondary_picture_header(s);
645 if(ret<0) return ret;
646 if(ret==1) goto intrax8_decoded;
649 /* decode each macroblock */
653 ret = decode_slice(s);
654 while(s->mb_y<s->mb_height){
655 if(s->msmpeg4_version){
656 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
659 int prev_x=s->mb_x, prev_y=s->mb_y;
660 if(ff_h263_resync(s)<0)
662 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
663 s->error_occurred = 1;
666 if(s->msmpeg4_version<4 && s->h263_pred)
667 ff_mpeg4_clean_buffers(s);
669 if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
672 if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
673 if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
674 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
677 assert(s->bitstream_buffer_size==0);
679 /* divx 5.01+ bistream reorder stuff */
680 if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
681 int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
682 int startcode_found=0;
684 if(buf_size - current_pos > 5){
686 for(i=current_pos; i<buf_size-4; i++){
687 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
688 startcode_found=!(buf[i+4]&0x40);
696 &s->bitstream_buffer,
697 &s->allocated_bitstream_buffer_size,
698 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
699 if (!s->bitstream_buffer)
700 return AVERROR(ENOMEM);
701 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
702 s->bitstream_buffer_size= buf_size - current_pos;
709 if (avctx->hwaccel) {
710 if (avctx->hwaccel->end_frame(avctx) < 0)
716 assert(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
717 assert(s->current_picture.f.pict_type == s->pict_type);
718 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
719 *pict= *(AVFrame*)s->current_picture_ptr;
720 } else if (s->last_picture_ptr != NULL) {
721 *pict= *(AVFrame*)s->last_picture_ptr;
724 if(s->last_picture_ptr || s->low_delay){
725 *data_size = sizeof(AVFrame);
726 ff_print_debug_info(s, pict);
729 #ifdef PRINT_FRAME_TIME
730 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
733 return (ret && avctx->error_recognition >= FF_ER_EXPLODE)?ret:get_consumed_bytes(s, buf_size);
736 AVCodec ff_h263_decoder = {
738 .type = AVMEDIA_TYPE_VIDEO,
740 .priv_data_size = sizeof(MpegEncContext),
741 .init = ff_h263_decode_init,
742 .close = ff_h263_decode_end,
743 .decode = ff_h263_decode_frame,
744 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
745 .flush= ff_mpeg_flush,
747 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
748 .pix_fmts= ff_hwaccel_pixfmt_list_420,