3 * Copyright (c) 2001 Fabrice Bellard.
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #include "mpegvideo.h"
31 //#define PRINT_FRAME_TIME
33 int ff_h263_decode_init(AVCodecContext *avctx)
35 MpegEncContext *s = avctx->priv_data;
38 s->out_format = FMT_H263;
40 s->width = avctx->width;
41 s->height = avctx->height;
42 s->workaround_bugs= avctx->workaround_bugs;
45 MPV_decode_defaults(s);
47 s->decode_mb= ff_h263_decode_mb;
49 avctx->pix_fmt= PIX_FMT_YUV420P;
50 s->unrestricted_mv= 1;
52 /* select sub codec */
53 switch(avctx->codec->id) {
55 s->unrestricted_mv= 0;
58 s->decode_mb= ff_mpeg4_decode_mb;
59 s->time_increment_bits = 4; /* default value for broken headers */
61 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
63 case CODEC_ID_MSMPEG4V1:
68 case CODEC_ID_MSMPEG4V2:
73 case CODEC_ID_MSMPEG4V3:
96 s->codec_id= avctx->codec->id;
98 /* for h263, we allocate the images after having read the header */
99 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
100 if (MPV_common_init(s) < 0)
104 ff_msmpeg4_decode_init(s);
106 h263_decode_init_vlc(s);
111 int ff_h263_decode_end(AVCodecContext *avctx)
113 MpegEncContext *s = avctx->priv_data;
120 * retunrs the number of bytes consumed for building the current frame
122 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
123 int pos= (get_bits_count(&s->gb)+7)>>3;
126 //we would have to scan through the whole buf to handle the weird reordering ...
128 }else if(s->flags&CODEC_FLAG_TRUNCATED){
129 pos -= s->parse_context.last_index;
130 if(pos<0) pos=0; // padding is not really read so this might be -1
133 if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
134 if(pos+10>buf_size) pos=buf_size; // oops ;)
140 static int decode_slice(MpegEncContext *s){
141 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
142 s->last_resync_gb= s->gb;
143 s->first_slice_line= 1;
145 s->resync_mb_x= s->mb_x;
146 s->resync_mb_y= s->mb_y;
148 ff_set_qscale(s, s->qscale);
150 if(s->partitioned_frame){
151 const int qscale= s->qscale;
153 if(s->codec_id==CODEC_ID_MPEG4){
154 if(ff_mpeg4_decode_partitions(s) < 0)
158 /* restore variables which were modified */
159 s->first_slice_line=1;
160 s->mb_x= s->resync_mb_x;
161 s->mb_y= s->resync_mb_y;
162 ff_set_qscale(s, qscale);
165 for(; s->mb_y < s->mb_height; s->mb_y++) {
166 /* per-row end of slice checks */
167 if(s->msmpeg4_version){
168 if(s->resync_mb_y + s->slice_height == s->mb_y){
169 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);
175 if(s->msmpeg4_version==1){
181 ff_init_block_index(s);
182 for(; s->mb_x < s->mb_width; s->mb_x++) {
185 ff_update_block_index(s);
187 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
188 s->first_slice_line=0;
192 s->dsp.clear_blocks(s->block[0]);
194 s->mv_dir = MV_DIR_FORWARD;
195 s->mv_type = MV_TYPE_16X16;
197 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
198 ret= s->decode_mb(s, s->block);
200 if (s->pict_type!=B_TYPE)
201 ff_h263_update_motion_val(s);
204 const int xy= s->mb_x + s->mb_y*s->mb_stride;
206 MPV_decode_mb(s, s->block);
208 ff_h263_loop_filter(s);
210 //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));
211 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);
213 s->padding_bug_score--;
215 if(++s->mb_x >= s->mb_width){
217 ff_draw_horiz_band(s, s->mb_y*16, 16);
221 }else if(ret==SLICE_NOEND){
222 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
223 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);
226 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
227 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);
232 MPV_decode_mb(s, s->block);
234 ff_h263_loop_filter(s);
237 ff_draw_horiz_band(s, s->mb_y*16, 16);
242 assert(s->mb_x==0 && s->mb_y==s->mb_height);
244 /* try to detect the padding bug */
245 if( s->codec_id==CODEC_ID_MPEG4
246 && (s->workaround_bugs&FF_BUG_AUTODETECT)
247 && s->gb.size_in_bits - get_bits_count(&s->gb) >=0
248 && s->gb.size_in_bits - get_bits_count(&s->gb) < 48
249 // && !s->resync_marker
250 && !s->data_partitioning){
252 const int bits_count= get_bits_count(&s->gb);
253 const int bits_left = s->gb.size_in_bits - bits_count;
256 s->padding_bug_score+=16;
257 }else if(bits_left>8){
258 s->padding_bug_score++;
259 } else if(bits_left != 1){
260 int v= show_bits(&s->gb, 8);
261 v|= 0x7F >> (7-(bits_count&7));
264 s->padding_bug_score--;
266 s->padding_bug_score++;
270 // handle formats which dont have unique end markers
271 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
272 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
275 /* no markers in M$ crap */
276 if(s->msmpeg4_version && s->pict_type==I_TYPE)
279 /* buggy padding but the frame should still end approximately at the bitstream end */
280 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
282 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
283 max_extra+= 256*256*256*64;
286 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
289 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
291 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);
296 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
297 s->gb.size_in_bits - get_bits_count(&s->gb),
298 show_bits(&s->gb, 24), s->padding_bug_score);
300 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);
306 * finds the end of the current frame in the bitstream.
307 * @return the position of the first byte of the next frame, or -1
309 int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
313 vop_found= pc->frame_start_found;
318 for(i=0; i<buf_size; i++){
319 state= (state<<8) | buf[i];
329 /* EOF considered as end of frame */
332 for(; i<buf_size; i++){
333 state= (state<<8) | buf[i];
334 if((state&0xFFFFFF00) == 0x100){
335 pc->frame_start_found=0;
341 pc->frame_start_found= vop_found;
343 return END_NOT_FOUND;
346 static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
350 vop_found= pc->frame_start_found;
355 for(i=0; i<buf_size; i++){
356 state= (state<<8) | buf[i];
357 if(state>>(32-22) == 0x20){
366 for(; i<buf_size; i++){
367 state= (state<<8) | buf[i];
368 if(state>>(32-22) == 0x20){
369 pc->frame_start_found=0;
375 pc->frame_start_found= vop_found;
378 return END_NOT_FOUND;
381 static int h263_parse(AVCodecParserContext *s,
382 AVCodecContext *avctx,
383 uint8_t **poutbuf, int *poutbuf_size,
384 const uint8_t *buf, int buf_size)
386 ParseContext *pc = s->priv_data;
389 next= h263_find_frame_end(pc, buf, buf_size);
391 if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
397 *poutbuf = (uint8_t *)buf;
398 *poutbuf_size = buf_size;
402 int ff_h263_decode_frame(AVCodecContext *avctx,
403 void *data, int *data_size,
404 uint8_t *buf, int buf_size)
406 MpegEncContext *s = avctx->priv_data;
408 AVFrame *pict = data;
410 #ifdef PRINT_FRAME_TIME
411 uint64_t time= rdtsc();
414 printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
415 printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
417 s->flags= avctx->flags;
418 s->flags2= avctx->flags2;
422 /* no supplementary picture */
424 /* special case for last picture */
425 if (s->low_delay==0 && s->next_picture_ptr) {
426 *pict= *(AVFrame*)s->next_picture_ptr;
427 s->next_picture_ptr= NULL;
429 *data_size = sizeof(AVFrame);
435 if(s->flags&CODEC_FLAG_TRUNCATED){
438 if(s->codec_id==CODEC_ID_MPEG4){
439 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
440 }else if(s->codec_id==CODEC_ID_H263){
441 next= h263_find_frame_end(&s->parse_context, buf, buf_size);
443 av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
447 if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
454 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
455 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
457 init_get_bits(&s->gb, buf, buf_size*8);
458 s->bitstream_buffer_size=0;
460 if (!s->context_initialized) {
461 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
465 //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
466 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
467 int i= ff_find_unused_picture(s, 0);
468 s->current_picture_ptr= &s->picture[i];
472 if (s->msmpeg4_version==5) {
473 ret= ff_wmv2_decode_picture_header(s);
474 } else if (s->msmpeg4_version) {
475 ret = msmpeg4_decode_picture_header(s);
476 } else if (s->h263_pred) {
477 if(s->avctx->extradata_size && s->picture_number==0){
480 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
481 ret = ff_mpeg4_decode_picture_header(s, &gb);
483 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
485 if(s->flags& CODEC_FLAG_LOW_DELAY)
487 } else if (s->codec_id == CODEC_ID_H263I) {
488 ret = intel_h263_decode_picture_header(s);
489 } else if (s->h263_flv) {
490 ret = flv_h263_decode_picture_header(s);
492 ret = h263_decode_picture_header(s);
495 if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
497 /* skip if the header was thrashed */
499 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
503 avctx->has_b_frames= !s->low_delay;
505 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
506 if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
507 s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
510 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
511 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
516 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
517 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
518 s->divx_version= 400; //divx 4
521 if(s->workaround_bugs&FF_BUG_AUTODETECT){
522 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
524 if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
525 s->workaround_bugs |= FF_BUG_NO_PADDING;
527 if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
528 s->workaround_bugs|= FF_BUG_XVID_ILACE;
530 if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
531 s->workaround_bugs|= FF_BUG_UMP4;
534 if(s->divx_version>=500){
535 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
538 if(s->divx_version>502){
539 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
542 if(s->xvid_build && s->xvid_build<=3)
543 s->padding_bug_score= 256*256*256*64;
545 if(s->xvid_build && s->xvid_build<=1)
546 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
548 if(s->xvid_build && s->xvid_build<=12)
549 s->workaround_bugs|= FF_BUG_EDGE;
551 if(s->xvid_build && s->xvid_build<=32)
552 s->workaround_bugs|= FF_BUG_DC_CLIP;
554 #define SET_QPEL_FUNC(postfix1, postfix2) \
555 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
556 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
557 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
559 if(s->lavc_build && s->lavc_build<4653)
560 s->workaround_bugs|= FF_BUG_STD_QPEL;
562 if(s->lavc_build && s->lavc_build<4655)
563 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
565 if(s->lavc_build && s->lavc_build<4670){
566 s->workaround_bugs|= FF_BUG_EDGE;
569 if(s->lavc_build && s->lavc_build<=4712)
570 s->workaround_bugs|= FF_BUG_DC_CLIP;
573 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
574 //printf("padding_bug_score: %d\n", s->padding_bug_score);
575 if(s->divx_version==501 && s->divx_build==20020416)
576 s->padding_bug_score= 256*256*256*64;
578 if(s->divx_version && s->divx_version<500){
579 s->workaround_bugs|= FF_BUG_EDGE;
583 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
585 if(s->divx_version==500)
586 s->padding_bug_score= 256*256*256*64;
588 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
589 * lets hope this at least works
591 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
592 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
593 s->workaround_bugs|= FF_BUG_NO_PADDING;
595 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
596 s->workaround_bugs|= FF_BUG_NO_PADDING;
600 if(s->workaround_bugs& FF_BUG_STD_QPEL){
601 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
602 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
603 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
604 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
605 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
606 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
608 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
609 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
610 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
611 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
612 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
613 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
616 if(avctx->debug & FF_DEBUG_BUGS)
617 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
618 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
619 s->divx_packed ? "p" : "");
621 #if 0 // dump bits per frame / qp / complexity
624 if(!f) f=fopen("rate_qp_cplx.txt", "w");
625 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
629 /* After H263 & mpeg4 header decode we have the height, width,*/
630 /* and other parameters. So then we could init the picture */
631 /* FIXME: By the way H263 decoder is evolving it should have */
632 /* an H263EncContext */
634 if ( s->width != avctx->width || s->height != avctx->height) {
635 /* H.263 could change picture size any time */
636 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
637 s->parse_context.buffer=0;
639 s->parse_context= pc;
641 if (!s->context_initialized) {
642 avctx->width = s->width;
643 avctx->height = s->height;
648 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
649 s->gob_index = ff_h263_get_gob_height(s);
652 s->current_picture.pict_type= s->pict_type;
653 s->current_picture.key_frame= s->pict_type == I_TYPE;
655 /* skip b frames if we dont have reference frames */
656 if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
657 /* skip b frames if we are in a hurry */
658 if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
659 /* skip everything if we are in a hurry>=5 */
660 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
662 if(s->next_p_frame_damaged){
663 if(s->pict_type==B_TYPE)
664 return get_consumed_bytes(s, buf_size);
666 s->next_p_frame_damaged=0;
669 if(MPV_frame_start(s, avctx) < 0)
673 printf("qscale=%d\n", s->qscale);
676 ff_er_frame_start(s);
678 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
679 //which isnt available before MPV_frame_start()
680 if (s->msmpeg4_version==5){
681 if(ff_wmv2_decode_secondary_picture_header(s) < 0)
685 /* decode each macroblock */
690 while(s->mb_y<s->mb_height){
691 if(s->msmpeg4_version){
692 if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
695 if(ff_h263_resync(s)<0)
699 if(s->msmpeg4_version<4 && s->h263_pred)
700 ff_mpeg4_clean_buffers(s);
705 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
706 if(msmpeg4_decode_ext_header(s, buf_size) < 0){
707 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
710 /* divx 5.01+ bistream reorder stuff */
711 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
712 int current_pos= get_bits_count(&s->gb)>>3;
713 int startcode_found=0;
715 if( buf_size - current_pos > 5
716 && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
718 for(i=current_pos; i<buf_size-3; i++){
719 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
725 if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
731 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
732 s->bitstream_buffer_size= buf_size - current_pos;
740 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
741 assert(s->current_picture.pict_type == s->pict_type);
742 if(s->pict_type==B_TYPE || s->low_delay){
743 *pict= *(AVFrame*)&s->current_picture;
744 ff_print_debug_info(s, pict);
746 *pict= *(AVFrame*)&s->last_picture;
748 ff_print_debug_info(s, pict);
751 /* Return the Picture timestamp as the frame number */
752 /* we substract 1 because it is added on utils.c */
753 avctx->frame_number = s->picture_number - 1;
755 /* dont output the last pic after seeking */
756 if(s->last_picture_ptr || s->low_delay)
757 *data_size = sizeof(AVFrame);
758 #ifdef PRINT_FRAME_TIME
759 printf("%Ld\n", rdtsc()-time);
762 return get_consumed_bytes(s, buf_size);
765 static const AVOption mpeg4_decoptions[] =
767 AVOPTION_SUB(avoptions_workaround_bug),
771 AVCodec mpeg4_decoder = {
775 sizeof(MpegEncContext),
779 ff_h263_decode_frame,
780 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
781 .options = mpeg4_decoptions,
782 .flush= ff_mpeg_flush,
785 AVCodec h263_decoder = {
789 sizeof(MpegEncContext),
793 ff_h263_decode_frame,
794 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
795 .flush= ff_mpeg_flush,
798 AVCodec msmpeg4v1_decoder = {
802 sizeof(MpegEncContext),
806 ff_h263_decode_frame,
807 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
811 AVCodec msmpeg4v2_decoder = {
815 sizeof(MpegEncContext),
819 ff_h263_decode_frame,
820 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
824 AVCodec msmpeg4v3_decoder = {
828 sizeof(MpegEncContext),
832 ff_h263_decode_frame,
833 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
834 .options = mpeg4_decoptions,
837 AVCodec wmv1_decoder = {
841 sizeof(MpegEncContext),
845 ff_h263_decode_frame,
846 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
850 AVCodec h263i_decoder = {
854 sizeof(MpegEncContext),
858 ff_h263_decode_frame,
859 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
863 AVCodec flv_decoder = {
867 sizeof(MpegEncContext),
871 ff_h263_decode_frame,
872 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
875 AVCodecParser h263_parser = {
877 sizeof(ParseContext),