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
28 #define UNCHECKED_BITSTREAM_READER 1
30 #include "libavutil/cpu.h"
34 #include "mpegvideo.h"
36 #include "h263_parser.h"
37 #include "mpeg4video_parser.h"
39 #include "vdpau_internal.h"
42 #include "mpeg4video.h"
45 //#define PRINT_FRAME_TIME
47 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
49 MpegEncContext *s = avctx->priv_data;
52 s->out_format = FMT_H263;
54 s->width = avctx->coded_width;
55 s->height = avctx->coded_height;
56 s->workaround_bugs= avctx->workaround_bugs;
59 MPV_decode_defaults(s);
61 s->decode_mb= ff_h263_decode_mb;
63 avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
64 s->unrestricted_mv= 1;
66 /* select sub codec */
67 switch(avctx->codec->id) {
69 s->unrestricted_mv= 0;
70 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
74 case CODEC_ID_MSMPEG4V1:
78 case CODEC_ID_MSMPEG4V2:
82 case CODEC_ID_MSMPEG4V3:
96 case CODEC_ID_VC1IMAGE:
97 case CODEC_ID_WMV3IMAGE:
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 * Return 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 ? (ER_AC_END|ER_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, ER_MB_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!=AV_PICTURE_TYPE_B)
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, ER_MB_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);
237 MPV_report_decode_progress(s);
241 }else if(ret==SLICE_NOEND){
242 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
243 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
246 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
247 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
252 MPV_decode_mb(s, s->block);
254 ff_h263_loop_filter(s);
257 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
258 MPV_report_decode_progress(s);
263 assert(s->mb_x==0 && s->mb_y==s->mb_height);
265 if(s->codec_id==CODEC_ID_MPEG4
266 && (s->workaround_bugs&FF_BUG_AUTODETECT)
267 && get_bits_left(&s->gb) >= 48
268 && show_bits(&s->gb, 24)==0x4010
269 && !s->data_partitioning)
270 s->padding_bug_score+=32;
272 /* try to detect the padding bug */
273 if( s->codec_id==CODEC_ID_MPEG4
274 && (s->workaround_bugs&FF_BUG_AUTODETECT)
275 && get_bits_left(&s->gb) >=0
276 && get_bits_left(&s->gb) < 137
277 // && !s->resync_marker
278 && !s->data_partitioning){
280 const int bits_count= get_bits_count(&s->gb);
281 const int bits_left = s->gb.size_in_bits - bits_count;
284 s->padding_bug_score+=16;
285 } else if(bits_left != 1){
286 int v= show_bits(&s->gb, 8);
287 v|= 0x7F >> (7-(bits_count&7));
289 if(v==0x7F && bits_left<=8)
290 s->padding_bug_score--;
291 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
292 s->padding_bug_score+= 4;
294 s->padding_bug_score++;
298 if(s->workaround_bugs&FF_BUG_AUTODETECT){
299 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
300 s->workaround_bugs |= FF_BUG_NO_PADDING;
302 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
305 // handle formats which don't have unique end markers
306 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
307 int left= get_bits_left(&s->gb);
310 /* no markers in M$ crap */
311 if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
314 /* buggy padding but the frame should still end approximately at the bitstream end */
315 if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
317 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
318 max_extra+= 256*256*256*64;
321 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
324 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
326 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
331 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
332 get_bits_left(&s->gb),
333 show_bits(&s->gb, 24), s->padding_bug_score);
335 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
340 int ff_h263_decode_frame(AVCodecContext *avctx,
341 void *data, int *data_size,
344 const uint8_t *buf = avpkt->data;
345 int buf_size = avpkt->size;
346 MpegEncContext *s = avctx->priv_data;
348 AVFrame *pict = data;
350 #ifdef PRINT_FRAME_TIME
351 uint64_t time= rdtsc();
353 s->flags= avctx->flags;
354 s->flags2= avctx->flags2;
356 /* no supplementary picture */
358 /* special case for last picture */
359 if (s->low_delay==0 && s->next_picture_ptr) {
360 *pict= *(AVFrame*)s->next_picture_ptr;
361 s->next_picture_ptr= NULL;
363 *data_size = sizeof(AVFrame);
369 if(s->flags&CODEC_FLAG_TRUNCATED){
372 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
373 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
374 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
375 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
377 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
381 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
387 if(s->divx_packed && s->bitstream_buffer_size){
389 for(i=0; i<buf_size-3; i++){
390 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
392 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
393 s->bitstream_buffer_size=0;
400 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
401 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
403 init_get_bits(&s->gb, buf, buf_size*8);
404 s->bitstream_buffer_size=0;
406 if (!s->context_initialized) {
407 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
411 /* We need to set current_picture_ptr before reading the header,
412 * otherwise we cannot store anyting in there */
413 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
414 int i= ff_find_unused_picture(s, 0);
417 s->current_picture_ptr= &s->picture[i];
421 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
422 ret= ff_wmv2_decode_picture_header(s);
423 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
424 ret = msmpeg4_decode_picture_header(s);
425 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
426 if(s->avctx->extradata_size && s->picture_number==0){
429 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
430 ret = ff_mpeg4_decode_picture_header(s, &gb);
432 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
433 } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
434 ret = ff_intel_h263_decode_picture_header(s);
435 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
436 ret = ff_flv_decode_picture_header(s);
438 ret = h263_decode_picture_header(s);
441 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
443 /* skip if the header was thrashed */
445 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
449 avctx->has_b_frames= !s->low_delay;
451 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
452 if(s->stream_codec_tag == AV_RL32("XVID") ||
453 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
454 s->codec_tag == AV_RL32("RMP4") ||
455 s->codec_tag == AV_RL32("SIPP")
459 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
460 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
465 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
466 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
467 s->divx_version= 400; //divx 4
470 if(s->xvid_build>=0 && s->divx_version>=0){
475 if(s->workaround_bugs&FF_BUG_AUTODETECT){
476 if(s->codec_tag == AV_RL32("XVIX"))
477 s->workaround_bugs|= FF_BUG_XVID_ILACE;
479 if(s->codec_tag == AV_RL32("UMP4")){
480 s->workaround_bugs|= FF_BUG_UMP4;
483 if(s->divx_version>=500 && s->divx_build<1814){
484 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
487 if(s->divx_version>502 && s->divx_build<1814){
488 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
491 if(s->xvid_build<=3U)
492 s->padding_bug_score= 256*256*256*64;
494 if(s->xvid_build<=1U)
495 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
497 if(s->xvid_build<=12U)
498 s->workaround_bugs|= FF_BUG_EDGE;
500 if(s->xvid_build<=32U)
501 s->workaround_bugs|= FF_BUG_DC_CLIP;
503 #define SET_QPEL_FUNC(postfix1, postfix2) \
504 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
505 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
506 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
508 if(s->lavc_build<4653U)
509 s->workaround_bugs|= FF_BUG_STD_QPEL;
511 if(s->lavc_build<4655U)
512 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
514 if(s->lavc_build<4670U){
515 s->workaround_bugs|= FF_BUG_EDGE;
518 if(s->lavc_build<=4712U)
519 s->workaround_bugs|= FF_BUG_DC_CLIP;
521 if(s->divx_version>=0)
522 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
523 //printf("padding_bug_score: %d\n", s->padding_bug_score);
524 if(s->divx_version==501 && s->divx_build==20020416)
525 s->padding_bug_score= 256*256*256*64;
527 if(s->divx_version<500U){
528 s->workaround_bugs|= FF_BUG_EDGE;
531 if(s->divx_version>=0)
532 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
534 if(s->divx_version==500)
535 s->padding_bug_score= 256*256*256*64;
537 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
538 * Let us hope this at least works.
540 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
541 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
542 s->workaround_bugs|= FF_BUG_NO_PADDING;
544 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
545 s->workaround_bugs|= FF_BUG_NO_PADDING;
549 if(s->workaround_bugs& FF_BUG_STD_QPEL){
550 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
551 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
552 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
553 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
554 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
555 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
557 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
558 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
559 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
560 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
561 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
562 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
565 if(avctx->debug & FF_DEBUG_BUGS)
566 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
567 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
568 s->divx_packed ? "p" : "");
571 if (s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
572 avctx->idct_algo= FF_IDCT_XVIDMMX;
573 ff_dct_common_init(s);
578 /* After H263 & mpeg4 header decode we have the height, width,*/
579 /* and other parameters. So then we could init the picture */
580 /* FIXME: By the way H263 decoder is evolving it should have */
581 /* an H263EncContext */
583 if ( s->width != avctx->coded_width
584 || s->height != avctx->coded_height) {
585 /* H.263 could change picture size any time */
586 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
588 if (HAVE_THREADS && (s->avctx->active_thread_type&FF_THREAD_FRAME)) {
589 av_log_missing_feature(s->avctx, "Width/height/bit depth/chroma idc changing with threads is", 0);
590 return -1; // width / height changed during parallelized decoding
593 s->parse_context.buffer=0;
595 s->parse_context= pc;
597 if (!s->context_initialized) {
598 avcodec_set_dimensions(avctx, s->width, s->height);
603 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
604 s->gob_index = ff_h263_get_gob_height(s);
606 // for skipping the frame
607 s->current_picture.f.pict_type = s->pict_type;
608 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
610 /* skip B-frames if we don't have reference frames */
611 if(s->last_picture_ptr==NULL && (s->pict_type==AV_PICTURE_TYPE_B || s->dropable)) return get_consumed_bytes(s, buf_size);
612 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
613 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
614 || avctx->skip_frame >= AVDISCARD_ALL)
615 return get_consumed_bytes(s, buf_size);
617 if(s->next_p_frame_damaged){
618 if(s->pict_type==AV_PICTURE_TYPE_B)
619 return get_consumed_bytes(s, buf_size);
621 s->next_p_frame_damaged=0;
624 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==AV_PICTURE_TYPE_B){
625 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
626 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
627 }else if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
628 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
629 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
631 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
632 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
635 if(MPV_frame_start(s, avctx) < 0)
638 if (!s->divx_packed) ff_thread_finish_setup(avctx);
640 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
641 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
645 if (avctx->hwaccel) {
646 if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
650 ff_er_frame_start(s);
652 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
653 //which is not available before MPV_frame_start()
654 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
655 ret = ff_wmv2_decode_secondary_picture_header(s);
656 if(ret<0) return ret;
657 if(ret==1) goto intrax8_decoded;
660 /* decode each macroblock */
664 ret = decode_slice(s);
665 while(s->mb_y<s->mb_height){
666 if(s->msmpeg4_version){
667 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)
670 int prev_x=s->mb_x, prev_y=s->mb_y;
671 if(ff_h263_resync(s)<0)
673 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
674 s->error_occurred = 1;
677 if(s->msmpeg4_version<4 && s->h263_pred)
678 ff_mpeg4_clean_buffers(s);
680 if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
683 if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
684 if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
685 s->error_status_table[s->mb_num-1]= ER_MB_ERROR;
688 assert(s->bitstream_buffer_size==0);
690 /* divx 5.01+ bistream reorder stuff */
691 if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
692 int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
693 int startcode_found=0;
695 if(buf_size - current_pos > 7){
697 for(i=current_pos; i<buf_size-4; i++){
698 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
699 startcode_found=!(buf[i+4]&0x40);
707 &s->bitstream_buffer,
708 &s->allocated_bitstream_buffer_size,
709 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
710 if (!s->bitstream_buffer)
711 return AVERROR(ENOMEM);
712 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
713 s->bitstream_buffer_size= buf_size - current_pos;
720 if (avctx->hwaccel) {
721 if (avctx->hwaccel->end_frame(avctx) < 0)
727 assert(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
728 assert(s->current_picture.f.pict_type == s->pict_type);
729 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
730 *pict= *(AVFrame*)s->current_picture_ptr;
731 } else if (s->last_picture_ptr != NULL) {
732 *pict= *(AVFrame*)s->last_picture_ptr;
735 if(s->last_picture_ptr || s->low_delay){
736 *data_size = sizeof(AVFrame);
737 ff_print_debug_info(s, pict);
740 #ifdef PRINT_FRAME_TIME
741 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
744 return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
747 AVCodec ff_h263_decoder = {
749 .type = AVMEDIA_TYPE_VIDEO,
751 .priv_data_size = sizeof(MpegEncContext),
752 .init = ff_h263_decode_init,
753 .close = ff_h263_decode_end,
754 .decode = ff_h263_decode_frame,
755 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
756 .flush= ff_mpeg_flush,
758 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
759 .pix_fmts= ff_hwaccel_pixfmt_list_420,