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"
33 #include "error_resilience.h"
34 #include "mpegvideo.h"
36 #include "h263_parser.h"
37 #include "mpeg4video_parser.h"
39 #include "vdpau_internal.h"
42 #include "mpeg4video.h"
44 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
46 MpegEncContext *s = avctx->priv_data;
50 s->out_format = FMT_H263;
52 s->width = avctx->coded_width;
53 s->height = avctx->coded_height;
54 s->workaround_bugs= avctx->workaround_bugs;
57 ff_MPV_decode_defaults(s);
59 s->decode_mb= ff_h263_decode_mb;
61 if (avctx->codec->id == AV_CODEC_ID_MSS2)
62 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
64 avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
65 s->unrestricted_mv= 1;
67 /* select sub codec */
68 switch(avctx->codec->id) {
69 case AV_CODEC_ID_H263:
70 case AV_CODEC_ID_H263P:
71 s->unrestricted_mv= 0;
72 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
74 case AV_CODEC_ID_MPEG4:
76 case AV_CODEC_ID_MSMPEG4V1:
80 case AV_CODEC_ID_MSMPEG4V2:
84 case AV_CODEC_ID_MSMPEG4V3:
88 case AV_CODEC_ID_WMV1:
92 case AV_CODEC_ID_WMV2:
97 case AV_CODEC_ID_WMV3:
98 case AV_CODEC_ID_VC1IMAGE:
99 case AV_CODEC_ID_WMV3IMAGE:
100 case AV_CODEC_ID_MSS2:
102 s->msmpeg4_version=6;
103 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
105 case AV_CODEC_ID_H263I:
107 case AV_CODEC_ID_FLV1:
111 return AVERROR(EINVAL);
113 s->codec_id= avctx->codec->id;
114 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
116 if (avctx->stream_codec_tag == AV_RL32("l263") && avctx->extradata_size == 56 && avctx->extradata[0] == 1)
119 /* for h263, we allocate the images after having read the header */
120 if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
121 if ((ret = ff_MPV_common_init(s)) < 0)
124 ff_h263_decode_init_vlc();
129 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
131 MpegEncContext *s = avctx->priv_data;
133 ff_MPV_common_end(s);
138 * Return the number of bytes consumed for building the current frame.
140 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
141 int pos= (get_bits_count(&s->gb)+7)>>3;
143 if(s->divx_packed || s->avctx->hwaccel){
144 //we would have to scan through the whole buf to handle the weird reordering ...
146 }else if(s->flags&CODEC_FLAG_TRUNCATED){
147 pos -= s->parse_context.last_index;
148 if(pos<0) pos=0; // padding is not really read so this might be -1
151 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
152 if(pos+10>buf_size) pos=buf_size; // oops ;)
158 static int decode_slice(MpegEncContext *s){
159 const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
160 const int mb_size= 16>>s->avctx->lowres;
163 s->last_resync_gb= s->gb;
164 s->first_slice_line= 1;
166 s->resync_mb_x= s->mb_x;
167 s->resync_mb_y= s->mb_y;
169 ff_set_qscale(s, s->qscale);
171 if (s->avctx->hwaccel) {
172 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
173 ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
174 // ensure we exit decode loop
175 s->mb_y = s->mb_height;
179 if(s->partitioned_frame){
180 const int qscale= s->qscale;
182 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
183 if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
187 /* restore variables which were modified */
188 s->first_slice_line=1;
189 s->mb_x= s->resync_mb_x;
190 s->mb_y= s->resync_mb_y;
191 ff_set_qscale(s, qscale);
194 for(; s->mb_y < s->mb_height; s->mb_y++) {
195 /* per-row end of slice checks */
196 if(s->msmpeg4_version){
197 if(s->resync_mb_y + s->slice_height == s->mb_y){
198 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
204 if(s->msmpeg4_version==1){
210 ff_init_block_index(s);
211 for(; s->mb_x < s->mb_width; s->mb_x++) {
214 ff_update_block_index(s);
216 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
217 s->first_slice_line=0;
222 s->mv_dir = MV_DIR_FORWARD;
223 s->mv_type = MV_TYPE_16X16;
224 // s->mb_skipped = 0;
225 av_dlog(s, "%d %d %06X\n",
226 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
227 ret= s->decode_mb(s, s->block);
229 if (s->pict_type!=AV_PICTURE_TYPE_B)
230 ff_h263_update_motion_val(s);
233 const int xy= s->mb_x + s->mb_y*s->mb_stride;
235 ff_MPV_decode_mb(s, s->block);
237 ff_h263_loop_filter(s);
239 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
241 s->padding_bug_score--;
243 if(++s->mb_x >= s->mb_width){
245 ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
246 ff_MPV_report_decode_progress(s);
250 }else if(ret==SLICE_NOEND){
251 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
252 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
253 return AVERROR_INVALIDDATA;
255 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
256 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
258 return AVERROR_INVALIDDATA;
261 ff_MPV_decode_mb(s, s->block);
263 ff_h263_loop_filter(s);
266 ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
267 ff_MPV_report_decode_progress(s);
272 av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
274 if(s->codec_id==AV_CODEC_ID_MPEG4
275 && (s->workaround_bugs&FF_BUG_AUTODETECT)
276 && get_bits_left(&s->gb) >= 48
277 && show_bits(&s->gb, 24)==0x4010
278 && !s->data_partitioning)
279 s->padding_bug_score+=32;
281 /* try to detect the padding bug */
282 if( s->codec_id==AV_CODEC_ID_MPEG4
283 && (s->workaround_bugs&FF_BUG_AUTODETECT)
284 && get_bits_left(&s->gb) >=0
285 && get_bits_left(&s->gb) < 137
286 // && !s->resync_marker
287 && !s->data_partitioning){
289 const int bits_count= get_bits_count(&s->gb);
290 const int bits_left = s->gb.size_in_bits - bits_count;
293 s->padding_bug_score+=16;
294 } else if(bits_left != 1){
295 int v= show_bits(&s->gb, 8);
296 v|= 0x7F >> (7-(bits_count&7));
298 if(v==0x7F && bits_left<=8)
299 s->padding_bug_score--;
300 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
301 s->padding_bug_score+= 4;
303 s->padding_bug_score++;
307 if(s->workaround_bugs&FF_BUG_AUTODETECT){
308 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
309 s->workaround_bugs |= FF_BUG_NO_PADDING;
311 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
314 // handle formats which don't have unique end markers
315 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
316 int left= get_bits_left(&s->gb);
319 /* no markers in M$ crap */
320 if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
323 /* buggy padding but the frame should still end approximately at the bitstream end */
324 if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
326 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
327 max_extra+= 256*256*256*64;
330 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
333 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
335 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
340 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
341 get_bits_left(&s->gb),
342 show_bits(&s->gb, 24), s->padding_bug_score);
344 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
346 return AVERROR_INVALIDDATA;
349 int ff_h263_decode_frame(AVCodecContext *avctx,
350 void *data, int *got_frame,
353 const uint8_t *buf = avpkt->data;
354 int buf_size = avpkt->size;
355 MpegEncContext *s = avctx->priv_data;
357 AVFrame *pict = data;
359 s->flags= avctx->flags;
360 s->flags2= avctx->flags2;
362 /* no supplementary picture */
364 /* special case for last picture */
365 if (s->low_delay==0 && s->next_picture_ptr) {
366 if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
368 s->next_picture_ptr= NULL;
376 if(s->flags&CODEC_FLAG_TRUNCATED){
379 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
380 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
381 }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
382 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
383 }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
384 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
386 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
387 return AVERROR(EINVAL);
390 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
396 if(s->divx_packed && s->bitstream_buffer_size){
398 for(i=0; i<buf_size-3; i++){
399 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
401 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
402 s->bitstream_buffer_size=0;
409 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
410 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
412 init_get_bits(&s->gb, buf, buf_size*8);
413 s->bitstream_buffer_size=0;
415 if (!s->context_initialized) {
416 if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
420 /* We need to set current_picture_ptr before reading the header,
421 * otherwise we cannot store anyting in there */
422 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
423 int i= ff_find_unused_picture(s, 0);
426 s->current_picture_ptr= &s->picture[i];
430 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
431 ret= ff_wmv2_decode_picture_header(s);
432 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
433 ret = ff_msmpeg4_decode_picture_header(s);
434 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
435 if(s->avctx->extradata_size && s->picture_number==0){
438 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
439 ret = ff_mpeg4_decode_picture_header(s, &gb);
441 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
442 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
443 ret = ff_intel_h263_decode_picture_header(s);
444 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
445 ret = ff_flv_decode_picture_header(s);
447 ret = ff_h263_decode_picture_header(s);
450 if (ret < 0 || ret==FRAME_SKIPPED) {
451 if ( s->width != avctx->coded_width
452 || s->height != avctx->coded_height) {
453 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
454 s->width = avctx->coded_width;
455 s->height= avctx->coded_height;
458 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
460 /* skip if the header was thrashed */
462 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
466 avctx->has_b_frames= !s->low_delay;
468 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
469 if(s->stream_codec_tag == AV_RL32("XVID") ||
470 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
471 s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") ||
472 s->codec_tag == AV_RL32("SIPP")
476 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
477 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
482 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
483 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
484 s->divx_version= 400; //divx 4
487 if(s->xvid_build>=0 && s->divx_version>=0){
492 if(s->workaround_bugs&FF_BUG_AUTODETECT){
493 if(s->codec_tag == AV_RL32("XVIX"))
494 s->workaround_bugs|= FF_BUG_XVID_ILACE;
496 if(s->codec_tag == AV_RL32("UMP4")){
497 s->workaround_bugs|= FF_BUG_UMP4;
500 if(s->divx_version>=500 && s->divx_build<1814){
501 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
504 if(s->divx_version>502 && s->divx_build<1814){
505 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
508 if(s->xvid_build<=3U)
509 s->padding_bug_score= 256*256*256*64;
511 if(s->xvid_build<=1U)
512 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
514 if(s->xvid_build<=12U)
515 s->workaround_bugs|= FF_BUG_EDGE;
517 if(s->xvid_build<=32U)
518 s->workaround_bugs|= FF_BUG_DC_CLIP;
520 #define SET_QPEL_FUNC(postfix1, postfix2) \
521 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
522 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
523 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
525 if(s->lavc_build<4653U)
526 s->workaround_bugs|= FF_BUG_STD_QPEL;
528 if(s->lavc_build<4655U)
529 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
531 if(s->lavc_build<4670U){
532 s->workaround_bugs|= FF_BUG_EDGE;
535 if(s->lavc_build<=4712U)
536 s->workaround_bugs|= FF_BUG_DC_CLIP;
538 if(s->divx_version>=0)
539 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
540 if(s->divx_version==501 && s->divx_build==20020416)
541 s->padding_bug_score= 256*256*256*64;
543 if(s->divx_version<500U){
544 s->workaround_bugs|= FF_BUG_EDGE;
547 if(s->divx_version>=0)
548 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
550 if(s->divx_version==500)
551 s->padding_bug_score= 256*256*256*64;
553 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
554 * Let us hope this at least works.
556 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
557 && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
558 s->workaround_bugs|= FF_BUG_NO_PADDING;
560 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
561 s->workaround_bugs|= FF_BUG_NO_PADDING;
565 if(s->workaround_bugs& FF_BUG_STD_QPEL){
566 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
567 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
568 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
569 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
570 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
571 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
573 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
574 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
575 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
576 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
577 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
578 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
581 if(avctx->debug & FF_DEBUG_BUGS)
582 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
583 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
584 s->divx_packed ? "p" : "");
587 if (s->codec_id == AV_CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
588 avctx->idct_algo= FF_IDCT_XVIDMMX;
589 ff_dct_common_init(s);
594 /* After H263 & mpeg4 header decode we have the height, width,*/
595 /* and other parameters. So then we could init the picture */
596 /* FIXME: By the way H263 decoder is evolving it should have */
597 /* an H263EncContext */
599 if (s->width != avctx->coded_width ||
600 s->height != avctx->coded_height ||
602 /* H.263 could change picture size any time */
603 s->context_reinit = 0;
605 avcodec_set_dimensions(avctx, s->width, s->height);
607 if ((ret = ff_MPV_common_frame_size_change(s)))
611 if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
612 s->gob_index = ff_h263_get_gob_height(s);
614 // for skipping the frame
615 s->current_picture.f.pict_type = s->pict_type;
616 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
618 /* skip B-frames if we don't have reference frames */
619 if (s->last_picture_ptr == NULL &&
620 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
621 return get_consumed_bytes(s, buf_size);
622 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
623 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
624 || avctx->skip_frame >= AVDISCARD_ALL)
625 return get_consumed_bytes(s, buf_size);
627 if(s->next_p_frame_damaged){
628 if(s->pict_type==AV_PICTURE_TYPE_B)
629 return get_consumed_bytes(s, buf_size);
631 s->next_p_frame_damaged=0;
634 if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
635 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
636 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
638 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
639 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
642 if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
645 if (!s->divx_packed && !avctx->hwaccel)
646 ff_thread_finish_setup(avctx);
648 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
649 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
653 if (avctx->hwaccel) {
654 if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
658 ff_mpeg_er_frame_start(s);
660 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
661 //which is not available before ff_MPV_frame_start()
662 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
663 ret = ff_wmv2_decode_secondary_picture_header(s);
664 if(ret<0) return ret;
665 if(ret==1) goto frame_end;
668 /* decode each macroblock */
672 ret = decode_slice(s);
673 while(s->mb_y<s->mb_height){
674 if(s->msmpeg4_version){
675 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
678 int prev_x=s->mb_x, prev_y=s->mb_y;
679 if(ff_h263_resync(s)<0)
681 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
682 s->er.error_occurred = 1;
685 if(s->msmpeg4_version<4 && s->h263_pred)
686 ff_mpeg4_clean_buffers(s);
688 if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
691 if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
692 if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
693 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
696 av_assert1(s->bitstream_buffer_size==0);
698 ff_er_frame_end(&s->er);
700 if (avctx->hwaccel) {
701 if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
707 /* divx 5.01+ bitstream reorder stuff */
708 /* Since this clobbers the input buffer and hwaccel codecs still need the
709 * data during hwaccel->end_frame we should not do this any earlier */
710 if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
711 int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
712 int startcode_found=0;
714 if(buf_size - current_pos > 7){
716 for(i=current_pos; i<buf_size-4; i++){
717 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
718 startcode_found=!(buf[i+4]&0x40);
726 &s->bitstream_buffer,
727 &s->allocated_bitstream_buffer_size,
728 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
729 if (!s->bitstream_buffer)
730 return AVERROR(ENOMEM);
731 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
732 s->bitstream_buffer_size= buf_size - current_pos;
736 if (!s->divx_packed && avctx->hwaccel)
737 ff_thread_finish_setup(avctx);
739 av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
740 av_assert1(s->current_picture.f.pict_type == s->pict_type);
741 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
742 if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
744 ff_print_debug_info(s, s->current_picture_ptr, pict);
745 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
746 } else if (s->last_picture_ptr != NULL) {
747 if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
749 ff_print_debug_info(s, s->last_picture_ptr, pict);
750 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
753 if(s->last_picture_ptr || s->low_delay){
754 if ( pict->format == AV_PIX_FMT_YUV420P
755 && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
757 av_frame_make_writable(pict);
758 for (p=0; p<3; p++) {
759 int w = FF_CEIL_RSHIFT(pict-> width, !!p);
760 int h = FF_CEIL_RSHIFT(pict->height, !!p);
761 int linesize = pict->linesize[p];
762 for (y=0; y<(h>>1); y++)
765 pict->data[p][x + y*linesize],
766 pict->data[p][x + (h-1-y)*linesize]);
772 return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
775 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
777 AV_PIX_FMT_VAAPI_VLD,
786 AVCodec ff_h263_decoder = {
788 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
789 .type = AVMEDIA_TYPE_VIDEO,
790 .id = AV_CODEC_ID_H263,
791 .priv_data_size = sizeof(MpegEncContext),
792 .init = ff_h263_decode_init,
793 .close = ff_h263_decode_end,
794 .decode = ff_h263_decode_frame,
795 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
796 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
797 .flush = ff_mpeg_flush,
799 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
802 AVCodec ff_h263p_decoder = {
804 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
805 .type = AVMEDIA_TYPE_VIDEO,
806 .id = AV_CODEC_ID_H263P,
807 .priv_data_size = sizeof(MpegEncContext),
808 .init = ff_h263_decode_init,
809 .close = ff_h263_decode_end,
810 .decode = ff_h263_decode_frame,
811 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
812 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
813 .flush = ff_mpeg_flush,
815 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,