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
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>=0 || !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==-1 && s->divx_version==-1 && s->lavc_build==-1){
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") ||
432
s->codec_tag == AV_RL32("SIPP")
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==-1 && s->divx_version==-1 && s->lavc_build==-1){
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>=0 && s->divx_version>=0){
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<=3U)
469
s->padding_bug_score= 256*256*256*64;
471
if(s->xvid_build<=1U)
472
s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
474
if(s->xvid_build<=12U)
475
s->workaround_bugs|= FF_BUG_EDGE;
477
if(s->xvid_build<=32U)
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<4653U)
486
s->workaround_bugs|= FF_BUG_STD_QPEL;
488
if(s->lavc_build<4655U)
489
s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
491
if(s->lavc_build<4670U){
492
s->workaround_bugs|= FF_BUG_EDGE;
495
if(s->lavc_build<=4712U)
496
s->workaround_bugs|= FF_BUG_DC_CLIP;
498
if(s->divx_version>=0)
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<500U){
505
s->workaround_bugs|= FF_BUG_EDGE;
508
if(s->divx_version>=0)
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==-1
518
&& s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
519
s->workaround_bugs|= FF_BUG_NO_PADDING;
521
if(s->lavc_build<4609U) //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>=0 && 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, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
627
if (avctx->hwaccel) {
628
if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 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);
669
/* divx 5.01+ bistream reorder stuff */
670
if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
671
int current_pos= get_bits_count(&s->gb)>>3;
672
int startcode_found=0;
674
if(buf_size - current_pos > 5){
676
for(i=current_pos; i<buf_size-3; i++){
677
if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
683
if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
690
&s->bitstream_buffer,
691
&s->allocated_bitstream_buffer_size,
692
buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
693
if (!s->bitstream_buffer)
694
return AVERROR(ENOMEM);
695
memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
696
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,