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 static int mpeg4_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
310 ParseContext *pc= &s->parse_context;
314 vop_found= pc->frame_start_found;
319 for(i=0; i<buf_size; i++){
320 state= (state<<8) | buf[i];
330 for(; i<buf_size; i++){
331 state= (state<<8) | buf[i];
332 if((state&0xFFFFFF00) == 0x100){
333 pc->frame_start_found=0;
339 pc->frame_start_found= vop_found;
341 return END_NOT_FOUND;
344 static int h263_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
345 ParseContext *pc= &s->parse_context;
349 vop_found= pc->frame_start_found;
354 for(i=0; i<buf_size; i++){
355 state= (state<<8) | buf[i];
356 if(state>>(32-22) == 0x20){
365 for(; i<buf_size; i++){
366 state= (state<<8) | buf[i];
367 if(state>>(32-22) == 0x20){
368 pc->frame_start_found=0;
374 pc->frame_start_found= vop_found;
377 return END_NOT_FOUND;
380 int ff_h263_decode_frame(AVCodecContext *avctx,
381 void *data, int *data_size,
382 uint8_t *buf, int buf_size)
384 MpegEncContext *s = avctx->priv_data;
386 AVFrame *pict = data;
388 #ifdef PRINT_FRAME_TIME
389 uint64_t time= rdtsc();
392 printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
393 printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
395 s->flags= avctx->flags;
396 s->flags2= avctx->flags2;
400 /* no supplementary picture */
402 /* special case for last picture */
403 if (s->low_delay==0 && s->next_picture_ptr) {
404 *pict= *(AVFrame*)s->next_picture_ptr;
405 s->next_picture_ptr= NULL;
407 *data_size = sizeof(AVFrame);
413 if(s->flags&CODEC_FLAG_TRUNCATED){
416 if(s->codec_id==CODEC_ID_MPEG4){
417 next= mpeg4_find_frame_end(s, buf, buf_size);
418 }else if(s->codec_id==CODEC_ID_H263){
419 next= h263_find_frame_end(s, buf, buf_size);
421 av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
425 if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
432 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
433 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
435 init_get_bits(&s->gb, buf, buf_size*8);
436 s->bitstream_buffer_size=0;
438 if (!s->context_initialized) {
439 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
443 //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
444 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
445 int i= ff_find_unused_picture(s, 0);
446 s->current_picture_ptr= &s->picture[i];
450 if (s->msmpeg4_version==5) {
451 ret= ff_wmv2_decode_picture_header(s);
452 } else if (s->msmpeg4_version) {
453 ret = msmpeg4_decode_picture_header(s);
454 } else if (s->h263_pred) {
455 if(s->avctx->extradata_size && s->picture_number==0){
458 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
459 ret = ff_mpeg4_decode_picture_header(s, &gb);
461 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
463 if(s->flags& CODEC_FLAG_LOW_DELAY)
465 } else if (s->codec_id == CODEC_ID_H263I) {
466 ret = intel_h263_decode_picture_header(s);
467 } else if (s->h263_flv) {
468 ret = flv_h263_decode_picture_header(s);
470 ret = h263_decode_picture_header(s);
473 if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
475 /* skip if the header was thrashed */
477 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
481 avctx->has_b_frames= !s->low_delay;
483 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
484 if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
485 s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
488 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
489 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
494 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
495 if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
496 s->divx_version= 400; //divx 4
499 if(s->workaround_bugs&FF_BUG_AUTODETECT){
500 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
502 if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
503 s->workaround_bugs |= FF_BUG_NO_PADDING;
505 if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
506 s->workaround_bugs|= FF_BUG_XVID_ILACE;
508 if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
509 s->workaround_bugs|= FF_BUG_UMP4;
512 if(s->divx_version>=500){
513 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
516 if(s->divx_version>502){
517 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
520 if(s->xvid_build && s->xvid_build<=3)
521 s->padding_bug_score= 256*256*256*64;
523 if(s->xvid_build && s->xvid_build<=1)
524 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
526 if(s->xvid_build && s->xvid_build<=12)
527 s->workaround_bugs|= FF_BUG_EDGE;
529 #define SET_QPEL_FUNC(postfix1, postfix2) \
530 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
531 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
532 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
534 if(s->lavc_build && s->lavc_build<4653)
535 s->workaround_bugs|= FF_BUG_STD_QPEL;
537 if(s->lavc_build && s->lavc_build<4655)
538 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
540 if(s->lavc_build && s->lavc_build<4670){
541 s->workaround_bugs|= FF_BUG_EDGE;
545 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
546 //printf("padding_bug_score: %d\n", s->padding_bug_score);
547 if(s->divx_version==501 && s->divx_build==20020416)
548 s->padding_bug_score= 256*256*256*64;
550 if(s->divx_version && s->divx_version<500){
551 s->workaround_bugs|= FF_BUG_EDGE;
555 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
557 if(s->divx_version==500)
558 s->padding_bug_score= 256*256*256*64;
560 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
561 * lets hope this at least works
563 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
564 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
565 s->workaround_bugs|= FF_BUG_NO_PADDING;
567 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
568 s->workaround_bugs|= FF_BUG_NO_PADDING;
572 if(s->workaround_bugs& FF_BUG_STD_QPEL){
573 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
574 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
575 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
576 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
577 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
578 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
580 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
581 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
582 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
583 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
584 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
585 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
588 if(avctx->debug & FF_DEBUG_BUGS)
589 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
590 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
591 s->divx_packed ? "p" : "");
593 #if 0 // dump bits per frame / qp / complexity
596 if(!f) f=fopen("rate_qp_cplx.txt", "w");
597 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
601 /* After H263 & mpeg4 header decode we have the height, width,*/
602 /* and other parameters. So then we could init the picture */
603 /* FIXME: By the way H263 decoder is evolving it should have */
604 /* an H263EncContext */
606 if ( s->width != avctx->width || s->height != avctx->height) {
607 /* H.263 could change picture size any time */
608 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
609 s->parse_context.buffer=0;
611 s->parse_context= pc;
613 if (!s->context_initialized) {
614 avctx->width = s->width;
615 avctx->height = s->height;
620 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
621 s->gob_index = ff_h263_get_gob_height(s);
624 s->current_picture.pict_type= s->pict_type;
625 s->current_picture.key_frame= s->pict_type == I_TYPE;
627 /* skip b frames if we dont have reference frames */
628 if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
629 /* skip b frames if we are in a hurry */
630 if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
631 /* skip everything if we are in a hurry>=5 */
632 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
634 if(s->next_p_frame_damaged){
635 if(s->pict_type==B_TYPE)
636 return get_consumed_bytes(s, buf_size);
638 s->next_p_frame_damaged=0;
641 if(MPV_frame_start(s, avctx) < 0)
645 printf("qscale=%d\n", s->qscale);
648 ff_er_frame_start(s);
650 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
651 //which isnt available before MPV_frame_start()
652 if (s->msmpeg4_version==5){
653 if(ff_wmv2_decode_secondary_picture_header(s) < 0)
657 /* decode each macroblock */
662 while(s->mb_y<s->mb_height){
663 if(s->msmpeg4_version){
664 if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
667 if(ff_h263_resync(s)<0)
671 if(s->msmpeg4_version<4 && s->h263_pred)
672 ff_mpeg4_clean_buffers(s);
677 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
678 if(msmpeg4_decode_ext_header(s, buf_size) < 0){
679 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
682 /* divx 5.01+ bistream reorder stuff */
683 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
684 int current_pos= get_bits_count(&s->gb)>>3;
685 int startcode_found=0;
687 if( buf_size - current_pos > 5
688 && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
690 for(i=current_pos; i<buf_size-3; i++){
691 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
697 if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
703 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
704 s->bitstream_buffer_size= buf_size - current_pos;
712 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
713 assert(s->current_picture.pict_type == s->pict_type);
714 if(s->pict_type==B_TYPE || s->low_delay){
715 *pict= *(AVFrame*)&s->current_picture;
716 ff_print_debug_info(s, pict);
718 *pict= *(AVFrame*)&s->last_picture;
719 ff_print_debug_info(s, pict);
722 /* Return the Picture timestamp as the frame number */
723 /* we substract 1 because it is added on utils.c */
724 avctx->frame_number = s->picture_number - 1;
726 /* dont output the last pic after seeking */
727 if(s->last_picture_ptr || s->low_delay)
728 *data_size = sizeof(AVFrame);
729 #ifdef PRINT_FRAME_TIME
730 printf("%Ld\n", rdtsc()-time);
733 return get_consumed_bytes(s, buf_size);
736 static const AVOption mpeg4_decoptions[] =
738 AVOPTION_SUB(avoptions_workaround_bug),
742 AVCodec mpeg4_decoder = {
746 sizeof(MpegEncContext),
750 ff_h263_decode_frame,
751 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
752 .options = mpeg4_decoptions,
753 .flush= ff_mpeg_flush,
756 AVCodec h263_decoder = {
760 sizeof(MpegEncContext),
764 ff_h263_decode_frame,
765 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
766 .flush= ff_mpeg_flush,
769 AVCodec msmpeg4v1_decoder = {
773 sizeof(MpegEncContext),
777 ff_h263_decode_frame,
778 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
782 AVCodec msmpeg4v2_decoder = {
786 sizeof(MpegEncContext),
790 ff_h263_decode_frame,
791 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
795 AVCodec msmpeg4v3_decoder = {
799 sizeof(MpegEncContext),
803 ff_h263_decode_frame,
804 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
805 .options = mpeg4_decoptions,
808 AVCodec wmv1_decoder = {
812 sizeof(MpegEncContext),
816 ff_h263_decode_frame,
817 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
821 AVCodec h263i_decoder = {
825 sizeof(MpegEncContext),
829 ff_h263_decode_frame,
830 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
834 AVCodec flv_decoder = {
838 sizeof(MpegEncContext),
842 ff_h263_decode_frame,
843 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1