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
24 * @file libavcodec/h263dec.c
31 #include "mpegvideo.h"
32 #include "h263_parser.h"
33 #include "mpeg4video_parser.h"
35 #include "vdpau_internal.h"
37 #include "mpeg4video.h"
40 //#define PRINT_FRAME_TIME
42 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
44 MpegEncContext *s = avctx->priv_data;
47 s->out_format = FMT_H263;
49 s->width = avctx->coded_width;
50 s->height = avctx->coded_height;
51 s->workaround_bugs= avctx->workaround_bugs;
54 MPV_decode_defaults(s);
56 s->decode_mb= ff_h263_decode_mb;
58 avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
59 s->unrestricted_mv= 1;
61 /* select sub codec */
62 switch(avctx->codec->id) {
64 s->unrestricted_mv= 0;
65 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
69 case CODEC_ID_MSMPEG4V1:
74 case CODEC_ID_MSMPEG4V2:
79 case CODEC_ID_MSMPEG4V3:
99 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
109 s->codec_id= avctx->codec->id;
110 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
112 /* for h263, we allocate the images after having read the header */
113 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
114 if (MPV_common_init(s) < 0)
117 if (CONFIG_MSMPEG4_DECODER && s->h263_msmpeg4)
118 ff_msmpeg4_decode_init(s);
120 h263_decode_init_vlc(s);
125 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
127 MpegEncContext *s = avctx->priv_data;
134 * returns 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 ? (AC_END|AC_ERROR) : 0x7F;
156 const int mb_size= 16>>s->avctx->lowres;
157 s->last_resync_gb= s->gb;
158 s->first_slice_line= 1;
160 s->resync_mb_x= s->mb_x;
161 s->resync_mb_y= s->mb_y;
163 ff_set_qscale(s, s->qscale);
165 if (s->avctx->hwaccel) {
166 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
167 const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
168 skip_bits_long(&s->gb, 8*(end - start));
169 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
172 if(s->partitioned_frame){
173 const int qscale= s->qscale;
175 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
176 if(ff_mpeg4_decode_partitions(s) < 0)
180 /* restore variables which were modified */
181 s->first_slice_line=1;
182 s->mb_x= s->resync_mb_x;
183 s->mb_y= s->resync_mb_y;
184 ff_set_qscale(s, qscale);
187 for(; s->mb_y < s->mb_height; s->mb_y++) {
188 /* per-row end of slice checks */
189 if(s->msmpeg4_version){
190 if(s->resync_mb_y + s->slice_height == s->mb_y){
191 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);
197 if(s->msmpeg4_version==1){
203 ff_init_block_index(s);
204 for(; s->mb_x < s->mb_width; s->mb_x++) {
207 ff_update_block_index(s);
209 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
210 s->first_slice_line=0;
215 s->mv_dir = MV_DIR_FORWARD;
216 s->mv_type = MV_TYPE_16X16;
217 // s->mb_skipped = 0;
218 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
219 ret= s->decode_mb(s, s->block);
221 if (s->pict_type!=FF_B_TYPE)
222 ff_h263_update_motion_val(s);
225 const int xy= s->mb_x + s->mb_y*s->mb_stride;
227 MPV_decode_mb(s, s->block);
229 ff_h263_loop_filter(s);
231 //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));
232 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);
234 s->padding_bug_score--;
236 if(++s->mb_x >= s->mb_width){
238 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
242 }else if(ret==SLICE_NOEND){
243 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
244 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);
247 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
248 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);
253 MPV_decode_mb(s, s->block);
255 ff_h263_loop_filter(s);
258 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
263 assert(s->mb_x==0 && s->mb_y==s->mb_height);
265 /* try to detect the padding bug */
266 if( s->codec_id==CODEC_ID_MPEG4
267 && (s->workaround_bugs&FF_BUG_AUTODETECT)
268 && get_bits_left(&s->gb) >=0
269 && get_bits_left(&s->gb) < 48
270 // && !s->resync_marker
271 && !s->data_partitioning){
273 const int bits_count= get_bits_count(&s->gb);
274 const int bits_left = s->gb.size_in_bits - bits_count;
277 s->padding_bug_score+=16;
278 } else if(bits_left != 1){
279 int v= show_bits(&s->gb, 8);
280 v|= 0x7F >> (7-(bits_count&7));
282 if(v==0x7F && bits_left<=8)
283 s->padding_bug_score--;
284 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
285 s->padding_bug_score+= 4;
287 s->padding_bug_score++;
291 if(s->workaround_bugs&FF_BUG_AUTODETECT){
292 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
293 s->workaround_bugs |= FF_BUG_NO_PADDING;
295 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
298 // handle formats which don't have unique end markers
299 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
300 int left= get_bits_left(&s->gb);
303 /* no markers in M$ crap */
304 if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
307 /* buggy padding but the frame should still end approximately at the bitstream end */
308 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
310 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
311 max_extra+= 256*256*256*64;
314 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
317 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
319 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);
324 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
325 get_bits_left(&s->gb),
326 show_bits(&s->gb, 24), s->padding_bug_score);
328 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);
333 int ff_h263_decode_frame(AVCodecContext *avctx,
334 void *data, int *data_size,
337 const uint8_t *buf = avpkt->data;
338 int buf_size = avpkt->size;
339 MpegEncContext *s = avctx->priv_data;
341 AVFrame *pict = data;
343 #ifdef PRINT_FRAME_TIME
344 uint64_t time= rdtsc();
346 s->flags= avctx->flags;
347 s->flags2= avctx->flags2;
349 /* no supplementary picture */
351 /* special case for last picture */
352 if (s->low_delay==0 && s->next_picture_ptr) {
353 *pict= *(AVFrame*)s->next_picture_ptr;
354 s->next_picture_ptr= NULL;
356 *data_size = sizeof(AVFrame);
362 if(s->flags&CODEC_FLAG_TRUNCATED){
365 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
366 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
367 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
368 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
370 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
374 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
381 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
382 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
384 init_get_bits(&s->gb, buf, buf_size*8);
385 s->bitstream_buffer_size=0;
387 if (!s->context_initialized) {
388 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
392 /* We need to set current_picture_ptr before reading the header,
393 * otherwise we cannot store anyting in there */
394 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
395 int i= ff_find_unused_picture(s, 0);
396 s->current_picture_ptr= &s->picture[i];
400 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
401 ret= ff_wmv2_decode_picture_header(s);
402 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
403 ret = msmpeg4_decode_picture_header(s);
404 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
405 if(s->avctx->extradata_size && s->picture_number==0){
408 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
409 ret = ff_mpeg4_decode_picture_header(s, &gb);
411 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
412 } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
413 ret = ff_intel_h263_decode_picture_header(s);
414 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
415 ret = ff_flv_decode_picture_header(s);
417 ret = h263_decode_picture_header(s);
420 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
422 /* skip if the header was thrashed */
424 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
428 avctx->has_b_frames= !s->low_delay;
430 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
431 if(s->stream_codec_tag == AV_RL32("XVID") ||
432 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
433 s->codec_tag == AV_RL32("RMP4"))
436 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
437 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
442 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
443 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
444 s->divx_version= 400; //divx 4
447 if(s->xvid_build && s->divx_version){
452 if(s->workaround_bugs&FF_BUG_AUTODETECT){
453 if(s->codec_tag == AV_RL32("XVIX"))
454 s->workaround_bugs|= FF_BUG_XVID_ILACE;
456 if(s->codec_tag == AV_RL32("UMP4")){
457 s->workaround_bugs|= FF_BUG_UMP4;
460 if(s->divx_version>=500 && s->divx_build<1814){
461 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
464 if(s->divx_version>502 && s->divx_build<1814){
465 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
468 if(s->xvid_build && s->xvid_build<=3)
469 s->padding_bug_score= 256*256*256*64;
471 if(s->xvid_build && s->xvid_build<=1)
472 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
474 if(s->xvid_build && s->xvid_build<=12)
475 s->workaround_bugs|= FF_BUG_EDGE;
477 if(s->xvid_build && s->xvid_build<=32)
478 s->workaround_bugs|= FF_BUG_DC_CLIP;
480 #define SET_QPEL_FUNC(postfix1, postfix2) \
481 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
482 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
483 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
485 if(s->lavc_build && s->lavc_build<4653)
486 s->workaround_bugs|= FF_BUG_STD_QPEL;
488 if(s->lavc_build && s->lavc_build<4655)
489 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
491 if(s->lavc_build && s->lavc_build<4670){
492 s->workaround_bugs|= FF_BUG_EDGE;
495 if(s->lavc_build && s->lavc_build<=4712)
496 s->workaround_bugs|= FF_BUG_DC_CLIP;
499 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
500 //printf("padding_bug_score: %d\n", s->padding_bug_score);
501 if(s->divx_version==501 && s->divx_build==20020416)
502 s->padding_bug_score= 256*256*256*64;
504 if(s->divx_version && s->divx_version<500){
505 s->workaround_bugs|= FF_BUG_EDGE;
509 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
511 if(s->divx_version==500)
512 s->padding_bug_score= 256*256*256*64;
514 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
515 * Let us hope this at least works.
517 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
518 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
519 s->workaround_bugs|= FF_BUG_NO_PADDING;
521 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
522 s->workaround_bugs|= FF_BUG_NO_PADDING;
526 if(s->workaround_bugs& FF_BUG_STD_QPEL){
527 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
528 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
529 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
530 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
531 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
532 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
534 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
535 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
536 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
537 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
538 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
539 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
542 if(avctx->debug & FF_DEBUG_BUGS)
543 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
544 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
545 s->divx_packed ? "p" : "");
547 #if 0 // dump bits per frame / qp / complexity
550 if(!f) f=fopen("rate_qp_cplx.txt", "w");
551 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
556 if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
557 avctx->idct_algo= FF_IDCT_XVIDMMX;
558 avctx->coded_width= 0; // force reinit
559 // dsputil_init(&s->dsp, avctx);
564 /* After H263 & mpeg4 header decode we have the height, width,*/
565 /* and other parameters. So then we could init the picture */
566 /* FIXME: By the way H263 decoder is evolving it should have */
567 /* an H263EncContext */
569 if ( s->width != avctx->coded_width
570 || s->height != avctx->coded_height) {
571 /* H.263 could change picture size any time */
572 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
573 s->parse_context.buffer=0;
575 s->parse_context= pc;
577 if (!s->context_initialized) {
578 avcodec_set_dimensions(avctx, s->width, s->height);
583 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
584 s->gob_index = ff_h263_get_gob_height(s);
587 s->current_picture.pict_type= s->pict_type;
588 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
590 /* skip B-frames if we don't have reference frames */
591 if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
592 /* skip b frames if we are in a hurry */
593 if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
594 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
595 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
596 || avctx->skip_frame >= AVDISCARD_ALL)
597 return get_consumed_bytes(s, buf_size);
598 /* skip everything if we are in a hurry>=5 */
599 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
601 if(s->next_p_frame_damaged){
602 if(s->pict_type==FF_B_TYPE)
603 return get_consumed_bytes(s, buf_size);
605 s->next_p_frame_damaged=0;
608 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
609 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
610 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
611 }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
612 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
613 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
615 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
616 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
619 if(MPV_frame_start(s, avctx) < 0)
622 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
623 ff_vdpau_mpeg4_decode_picture(s, buf, buf_size);
627 if (avctx->hwaccel) {
628 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
632 ff_er_frame_start(s);
634 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
635 //which is not available before MPV_frame_start()
636 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
637 ret = ff_wmv2_decode_secondary_picture_header(s);
638 if(ret<0) return ret;
639 if(ret==1) goto intrax8_decoded;
642 /* decode each macroblock */
647 while(s->mb_y<s->mb_height){
648 if(s->msmpeg4_version){
649 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)
652 if(ff_h263_resync(s)<0)
656 if(s->msmpeg4_version<4 && s->h263_pred)
657 ff_mpeg4_clean_buffers(s);
662 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
663 if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
664 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
667 assert(s->bitstream_buffer_size==0);
668 /* divx 5.01+ bistream reorder stuff */
669 if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
670 int current_pos= get_bits_count(&s->gb)>>3;
671 int startcode_found=0;
673 if(buf_size - current_pos > 5){
675 for(i=current_pos; i<buf_size-3; i++){
676 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
682 if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build){ //xvid style
689 &s->bitstream_buffer,
690 &s->allocated_bitstream_buffer_size,
691 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
692 if (!s->bitstream_buffer)
693 return AVERROR(ENOMEM);
694 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
695 s->bitstream_buffer_size= buf_size - current_pos;
703 if (avctx->hwaccel) {
704 if (avctx->hwaccel->end_frame(avctx) < 0)
710 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
711 assert(s->current_picture.pict_type == s->pict_type);
712 if (s->pict_type == FF_B_TYPE || s->low_delay) {
713 *pict= *(AVFrame*)s->current_picture_ptr;
714 } else if (s->last_picture_ptr != NULL) {
715 *pict= *(AVFrame*)s->last_picture_ptr;
718 if(s->last_picture_ptr || s->low_delay){
719 *data_size = sizeof(AVFrame);
720 ff_print_debug_info(s, pict);
723 #ifdef PRINT_FRAME_TIME
724 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
727 return get_consumed_bytes(s, buf_size);
730 AVCodec h263_decoder = {
734 sizeof(MpegEncContext),
738 ff_h263_decode_frame,
739 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
740 .flush= ff_mpeg_flush,
741 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
742 .pix_fmts= ff_hwaccel_pixfmt_list_420,
745 AVCodec msmpeg4v1_decoder = {
749 sizeof(MpegEncContext),
753 ff_h263_decode_frame,
754 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
755 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
756 .pix_fmts= ff_pixfmt_list_420,
759 AVCodec msmpeg4v2_decoder = {
763 sizeof(MpegEncContext),
767 ff_h263_decode_frame,
768 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
769 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
770 .pix_fmts= ff_pixfmt_list_420,
773 AVCodec msmpeg4v3_decoder = {
777 sizeof(MpegEncContext),
781 ff_h263_decode_frame,
782 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
783 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
784 .pix_fmts= ff_pixfmt_list_420,
787 AVCodec wmv1_decoder = {
791 sizeof(MpegEncContext),
795 ff_h263_decode_frame,
796 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
797 .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
798 .pix_fmts= ff_pixfmt_list_420,