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"
33 #include "h263_parser.h"
34 #include "mpeg4video_parser.h"
36 #include "vdpau_internal.h"
38 #include "mpeg4video.h"
41 //#define PRINT_FRAME_TIME
43 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
45 MpegEncContext *s = avctx->priv_data;
48 s->out_format = FMT_H263;
50 s->width = avctx->coded_width;
51 s->height = avctx->coded_height;
52 s->workaround_bugs= avctx->workaround_bugs;
55 MPV_decode_defaults(s);
57 s->decode_mb= ff_h263_decode_mb;
59 avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
60 s->unrestricted_mv= 1;
62 /* select sub codec */
63 switch(avctx->codec->id) {
65 s->unrestricted_mv= 0;
66 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
70 case CODEC_ID_MSMPEG4V1:
75 case CODEC_ID_MSMPEG4V2:
80 case CODEC_ID_MSMPEG4V3:
100 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
110 s->codec_id= avctx->codec->id;
111 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
113 /* for h263, we allocate the images after having read the header */
114 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
115 if (MPV_common_init(s) < 0)
118 h263_decode_init_vlc(s);
123 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
125 MpegEncContext *s = avctx->priv_data;
132 * returns the number of bytes consumed for building the current frame
134 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
135 int pos= (get_bits_count(&s->gb)+7)>>3;
137 if(s->divx_packed || s->avctx->hwaccel){
138 //we would have to scan through the whole buf to handle the weird reordering ...
140 }else if(s->flags&CODEC_FLAG_TRUNCATED){
141 pos -= s->parse_context.last_index;
142 if(pos<0) pos=0; // padding is not really read so this might be -1
145 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
146 if(pos+10>buf_size) pos=buf_size; // oops ;)
152 static int decode_slice(MpegEncContext *s){
153 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
154 const int mb_size= 16>>s->avctx->lowres;
155 s->last_resync_gb= s->gb;
156 s->first_slice_line= 1;
158 s->resync_mb_x= s->mb_x;
159 s->resync_mb_y= s->mb_y;
161 ff_set_qscale(s, s->qscale);
163 if (s->avctx->hwaccel) {
164 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
165 const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
166 skip_bits_long(&s->gb, 8*(end - start));
167 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
170 if(s->partitioned_frame){
171 const int qscale= s->qscale;
173 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
174 if(ff_mpeg4_decode_partitions(s) < 0)
178 /* restore variables which were modified */
179 s->first_slice_line=1;
180 s->mb_x= s->resync_mb_x;
181 s->mb_y= s->resync_mb_y;
182 ff_set_qscale(s, qscale);
185 for(; s->mb_y < s->mb_height; s->mb_y++) {
186 /* per-row end of slice checks */
187 if(s->msmpeg4_version){
188 if(s->resync_mb_y + s->slice_height == s->mb_y){
189 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);
195 if(s->msmpeg4_version==1){
201 ff_init_block_index(s);
202 for(; s->mb_x < s->mb_width; s->mb_x++) {
205 ff_update_block_index(s);
207 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
208 s->first_slice_line=0;
213 s->mv_dir = MV_DIR_FORWARD;
214 s->mv_type = MV_TYPE_16X16;
215 // s->mb_skipped = 0;
216 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
217 ret= s->decode_mb(s, s->block);
219 if (s->pict_type!=FF_B_TYPE)
220 ff_h263_update_motion_val(s);
223 const int xy= s->mb_x + s->mb_y*s->mb_stride;
225 MPV_decode_mb(s, s->block);
227 ff_h263_loop_filter(s);
229 //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));
230 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);
232 s->padding_bug_score--;
234 if(++s->mb_x >= s->mb_width){
236 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
240 }else if(ret==SLICE_NOEND){
241 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
242 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);
245 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
246 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);
251 MPV_decode_mb(s, s->block);
253 ff_h263_loop_filter(s);
256 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
261 assert(s->mb_x==0 && s->mb_y==s->mb_height);
263 /* try to detect the padding bug */
264 if( s->codec_id==CODEC_ID_MPEG4
265 && (s->workaround_bugs&FF_BUG_AUTODETECT)
266 && get_bits_left(&s->gb) >=0
267 && get_bits_left(&s->gb) < 48
268 // && !s->resync_marker
269 && !s->data_partitioning){
271 const int bits_count= get_bits_count(&s->gb);
272 const int bits_left = s->gb.size_in_bits - bits_count;
275 s->padding_bug_score+=16;
276 } else if(bits_left != 1){
277 int v= show_bits(&s->gb, 8);
278 v|= 0x7F >> (7-(bits_count&7));
280 if(v==0x7F && bits_left<=8)
281 s->padding_bug_score--;
282 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
283 s->padding_bug_score+= 4;
285 s->padding_bug_score++;
289 if(s->workaround_bugs&FF_BUG_AUTODETECT){
290 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
291 s->workaround_bugs |= FF_BUG_NO_PADDING;
293 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
296 // handle formats which don't have unique end markers
297 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
298 int left= get_bits_left(&s->gb);
301 /* no markers in M$ crap */
302 if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
305 /* buggy padding but the frame should still end approximately at the bitstream end */
306 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
308 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
309 max_extra+= 256*256*256*64;
312 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
315 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
317 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);
322 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
323 get_bits_left(&s->gb),
324 show_bits(&s->gb, 24), s->padding_bug_score);
326 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);
331 int ff_h263_decode_frame(AVCodecContext *avctx,
332 void *data, int *data_size,
335 const uint8_t *buf = avpkt->data;
336 int buf_size = avpkt->size;
337 MpegEncContext *s = avctx->priv_data;
339 AVFrame *pict = data;
341 #ifdef PRINT_FRAME_TIME
342 uint64_t time= rdtsc();
344 s->flags= avctx->flags;
345 s->flags2= avctx->flags2;
347 /* no supplementary picture */
349 /* special case for last picture */
350 if (s->low_delay==0 && s->next_picture_ptr) {
351 *pict= *(AVFrame*)s->next_picture_ptr;
352 s->next_picture_ptr= NULL;
354 *data_size = sizeof(AVFrame);
360 if(s->flags&CODEC_FLAG_TRUNCATED){
363 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
364 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
365 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
366 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
368 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
372 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
379 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
380 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
382 init_get_bits(&s->gb, buf, buf_size*8);
383 s->bitstream_buffer_size=0;
385 if (!s->context_initialized) {
386 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
390 /* We need to set current_picture_ptr before reading the header,
391 * otherwise we cannot store anyting in there */
392 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
393 int i= ff_find_unused_picture(s, 0);
394 s->current_picture_ptr= &s->picture[i];
398 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
399 ret= ff_wmv2_decode_picture_header(s);
400 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
401 ret = msmpeg4_decode_picture_header(s);
402 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
403 if(s->avctx->extradata_size && s->picture_number==0){
406 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
407 ret = ff_mpeg4_decode_picture_header(s, &gb);
409 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
410 } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
411 ret = ff_intel_h263_decode_picture_header(s);
412 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
413 ret = ff_flv_decode_picture_header(s);
415 ret = h263_decode_picture_header(s);
418 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
420 /* skip if the header was thrashed */
422 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
426 avctx->has_b_frames= !s->low_delay;
428 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
429 if(s->stream_codec_tag == AV_RL32("XVID") ||
430 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
431 s->codec_tag == AV_RL32("RMP4"))
434 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
435 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
440 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
441 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
442 s->divx_version= 400; //divx 4
445 if(s->xvid_build && s->divx_version){
450 if(s->workaround_bugs&FF_BUG_AUTODETECT){
451 if(s->codec_tag == AV_RL32("XVIX"))
452 s->workaround_bugs|= FF_BUG_XVID_ILACE;
454 if(s->codec_tag == AV_RL32("UMP4")){
455 s->workaround_bugs|= FF_BUG_UMP4;
458 if(s->divx_version>=500 && s->divx_build<1814){
459 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
462 if(s->divx_version>502 && s->divx_build<1814){
463 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
466 if(s->xvid_build && s->xvid_build<=3)
467 s->padding_bug_score= 256*256*256*64;
469 if(s->xvid_build && s->xvid_build<=1)
470 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
472 if(s->xvid_build && s->xvid_build<=12)
473 s->workaround_bugs|= FF_BUG_EDGE;
475 if(s->xvid_build && s->xvid_build<=32)
476 s->workaround_bugs|= FF_BUG_DC_CLIP;
478 #define SET_QPEL_FUNC(postfix1, postfix2) \
479 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
480 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
481 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
483 if(s->lavc_build && s->lavc_build<4653)
484 s->workaround_bugs|= FF_BUG_STD_QPEL;
486 if(s->lavc_build && s->lavc_build<4655)
487 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
489 if(s->lavc_build && s->lavc_build<4670){
490 s->workaround_bugs|= FF_BUG_EDGE;
493 if(s->lavc_build && s->lavc_build<=4712)
494 s->workaround_bugs|= FF_BUG_DC_CLIP;
497 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
498 //printf("padding_bug_score: %d\n", s->padding_bug_score);
499 if(s->divx_version==501 && s->divx_build==20020416)
500 s->padding_bug_score= 256*256*256*64;
502 if(s->divx_version && s->divx_version<500){
503 s->workaround_bugs|= FF_BUG_EDGE;
507 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
509 if(s->divx_version==500)
510 s->padding_bug_score= 256*256*256*64;
512 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
513 * Let us hope this at least works.
515 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
516 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
517 s->workaround_bugs|= FF_BUG_NO_PADDING;
519 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
520 s->workaround_bugs|= FF_BUG_NO_PADDING;
524 if(s->workaround_bugs& FF_BUG_STD_QPEL){
525 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
526 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
527 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
528 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
529 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
530 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
532 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
533 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
534 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
535 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
536 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
537 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
540 if(avctx->debug & FF_DEBUG_BUGS)
541 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
542 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
543 s->divx_packed ? "p" : "");
545 #if 0 // dump bits per frame / qp / complexity
548 if(!f) f=fopen("rate_qp_cplx.txt", "w");
549 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
554 if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
555 avctx->idct_algo= FF_IDCT_XVIDMMX;
556 avctx->coded_width= 0; // force reinit
557 // dsputil_init(&s->dsp, avctx);
562 /* After H263 & mpeg4 header decode we have the height, width,*/
563 /* and other parameters. So then we could init the picture */
564 /* FIXME: By the way H263 decoder is evolving it should have */
565 /* an H263EncContext */
567 if ( s->width != avctx->coded_width
568 || s->height != avctx->coded_height) {
569 /* H.263 could change picture size any time */
570 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
571 s->parse_context.buffer=0;
573 s->parse_context= pc;
575 if (!s->context_initialized) {
576 avcodec_set_dimensions(avctx, s->width, s->height);
581 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
582 s->gob_index = ff_h263_get_gob_height(s);
585 s->current_picture.pict_type= s->pict_type;
586 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
588 /* skip B-frames if we don't have reference frames */
589 if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
590 /* skip b frames if we are in a hurry */
591 if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
592 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
593 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
594 || avctx->skip_frame >= AVDISCARD_ALL)
595 return get_consumed_bytes(s, buf_size);
596 /* skip everything if we are in a hurry>=5 */
597 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
599 if(s->next_p_frame_damaged){
600 if(s->pict_type==FF_B_TYPE)
601 return get_consumed_bytes(s, buf_size);
603 s->next_p_frame_damaged=0;
606 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
607 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
608 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
609 }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
610 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
611 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
613 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
614 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
617 if(MPV_frame_start(s, avctx) < 0)
620 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
621 ff_vdpau_mpeg4_decode_picture(s, buf, buf_size);
625 if (avctx->hwaccel) {
626 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
630 ff_er_frame_start(s);
632 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
633 //which is not available before MPV_frame_start()
634 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
635 ret = ff_wmv2_decode_secondary_picture_header(s);
636 if(ret<0) return ret;
637 if(ret==1) goto intrax8_decoded;
640 /* decode each macroblock */
645 while(s->mb_y<s->mb_height){
646 if(s->msmpeg4_version){
647 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)
650 if(ff_h263_resync(s)<0)
654 if(s->msmpeg4_version<4 && s->h263_pred)
655 ff_mpeg4_clean_buffers(s);
660 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
661 if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
662 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
665 assert(s->bitstream_buffer_size==0);
666 /* divx 5.01+ bistream reorder stuff */
667 if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
668 int current_pos= get_bits_count(&s->gb)>>3;
669 int startcode_found=0;
671 if(buf_size - current_pos > 5){
673 for(i=current_pos; i<buf_size-3; i++){
674 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
680 if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build){ //xvid style
687 &s->bitstream_buffer,
688 &s->allocated_bitstream_buffer_size,
689 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
690 if (!s->bitstream_buffer)
691 return AVERROR(ENOMEM);
692 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
693 s->bitstream_buffer_size= buf_size - current_pos;
701 if (avctx->hwaccel) {
702 if (avctx->hwaccel->end_frame(avctx) < 0)
708 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
709 assert(s->current_picture.pict_type == s->pict_type);
710 if (s->pict_type == FF_B_TYPE || s->low_delay) {
711 *pict= *(AVFrame*)s->current_picture_ptr;
712 } else if (s->last_picture_ptr != NULL) {
713 *pict= *(AVFrame*)s->last_picture_ptr;
716 if(s->last_picture_ptr || s->low_delay){
717 *data_size = sizeof(AVFrame);
718 ff_print_debug_info(s, pict);
721 #ifdef PRINT_FRAME_TIME
722 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
725 return get_consumed_bytes(s, buf_size);
728 AVCodec h263_decoder = {
732 sizeof(MpegEncContext),
736 ff_h263_decode_frame,
737 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
738 .flush= ff_mpeg_flush,
739 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
740 .pix_fmts= ff_hwaccel_pixfmt_list_420,