/* * H.263 decoder * Copyright (c) 2001 Fabrice Bellard * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * H.263 decoder. */ #define UNCHECKED_BITSTREAM_READER 1 #include "libavutil/cpu.h" #include "internal.h" #include "avcodec.h" #include "dsputil.h" #include "mpegvideo.h" #include "h263.h" #include "h263_parser.h" #include "mpeg4video_parser.h" #include "msmpeg4.h" #include "vdpau_internal.h" #include "thread.h" #include "flv.h" #include "mpeg4video.h" //#define DEBUG //#define PRINT_FRAME_TIME av_cold int ff_h263_decode_init(AVCodecContext *avctx) { MpegEncContext *s = avctx->priv_data; s->avctx = avctx; s->out_format = FMT_H263; s->width = avctx->coded_width; s->height = avctx->coded_height; s->workaround_bugs= avctx->workaround_bugs; // set defaults MPV_decode_defaults(s); s->quant_precision=5; s->decode_mb= ff_h263_decode_mb; s->low_delay= 1; avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts); s->unrestricted_mv= 1; /* select sub codec */ switch(avctx->codec->id) { case CODEC_ID_H263: s->unrestricted_mv= 0; avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; break; case CODEC_ID_MPEG4: break; case CODEC_ID_MSMPEG4V1: s->h263_pred = 1; s->msmpeg4_version=1; break; case CODEC_ID_MSMPEG4V2: s->h263_pred = 1; s->msmpeg4_version=2; break; case CODEC_ID_MSMPEG4V3: s->h263_pred = 1; s->msmpeg4_version=3; break; case CODEC_ID_WMV1: s->h263_pred = 1; s->msmpeg4_version=4; break; case CODEC_ID_WMV2: s->h263_pred = 1; s->msmpeg4_version=5; break; case CODEC_ID_VC1: case CODEC_ID_WMV3: case CODEC_ID_VC1IMAGE: case CODEC_ID_WMV3IMAGE: s->h263_pred = 1; s->msmpeg4_version=6; avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break; case CODEC_ID_H263I: break; case CODEC_ID_FLV1: s->h263_flv = 1; break; default: return -1; } s->codec_id= avctx->codec->id; avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt); /* for h263, we allocate the images after having read the header */ if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4) if (MPV_common_init(s) < 0) return -1; h263_decode_init_vlc(s); return 0; } av_cold int ff_h263_decode_end(AVCodecContext *avctx) { MpegEncContext *s = avctx->priv_data; MPV_common_end(s); return 0; } /** * Return the number of bytes consumed for building the current frame. */ static int get_consumed_bytes(MpegEncContext *s, int buf_size){ int pos= (get_bits_count(&s->gb)+7)>>3; if(s->divx_packed || s->avctx->hwaccel){ //we would have to scan through the whole buf to handle the weird reordering ... return buf_size; }else if(s->flags&CODEC_FLAG_TRUNCATED){ pos -= s->parse_context.last_index; if(pos<0) pos=0; // padding is not really read so this might be -1 return pos; }else{ if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...) if(pos+10>buf_size) pos=buf_size; // oops ;) return pos; } } static int decode_slice(MpegEncContext *s){ const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F; const int mb_size= 16>>s->avctx->lowres; s->last_resync_gb= s->gb; s->first_slice_line= 1; s->resync_mb_x= s->mb_x; s->resync_mb_y= s->mb_y; ff_set_qscale(s, s->qscale); if (s->avctx->hwaccel) { const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8; const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end); skip_bits_long(&s->gb, 8*(end - start)); return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start); } if(s->partitioned_frame){ const int qscale= s->qscale; if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){ if(ff_mpeg4_decode_partitions(s) < 0) return -1; } /* restore variables which were modified */ s->first_slice_line=1; s->mb_x= s->resync_mb_x; s->mb_y= s->resync_mb_y; ff_set_qscale(s, qscale); } for(; s->mb_y < s->mb_height; s->mb_y++) { /* per-row end of slice checks */ if(s->msmpeg4_version){ if(s->resync_mb_y + s->slice_height == s->mb_y){ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END); return 0; } } if(s->msmpeg4_version==1){ s->last_dc[0]= s->last_dc[1]= s->last_dc[2]= 128; } ff_init_block_index(s); for(; s->mb_x < s->mb_width; s->mb_x++) { int ret; ff_update_block_index(s); if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){ s->first_slice_line=0; } /* DCT & quantize */ s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; // s->mb_skipped = 0; //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24)); ret= s->decode_mb(s, s->block); if (s->pict_type!=AV_PICTURE_TYPE_B) ff_h263_update_motion_val(s); if(ret<0){ const int xy= s->mb_x + s->mb_y*s->mb_stride; if(ret==SLICE_END){ MPV_decode_mb(s, s->block); if(s->loop_filter) ff_h263_loop_filter(s); //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)); ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask); s->padding_bug_score--; if(++s->mb_x >= s->mb_width){ s->mb_x=0; ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size); MPV_report_decode_progress(s); s->mb_y++; } return 0; }else if(ret==SLICE_NOEND){ av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy); 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); return -1; } av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy); ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask); return -1; } MPV_decode_mb(s, s->block); if(s->loop_filter) ff_h263_loop_filter(s); } ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size); MPV_report_decode_progress(s); s->mb_x= 0; } assert(s->mb_x==0 && s->mb_y==s->mb_height); if(s->codec_id==CODEC_ID_MPEG4 && (s->workaround_bugs&FF_BUG_AUTODETECT) && get_bits_left(&s->gb) >= 48 && show_bits(&s->gb, 24)==0x4010 && !s->data_partitioning) s->padding_bug_score+=32; /* try to detect the padding bug */ if( s->codec_id==CODEC_ID_MPEG4 && (s->workaround_bugs&FF_BUG_AUTODETECT) && get_bits_left(&s->gb) >=0 && get_bits_left(&s->gb) < 137 // && !s->resync_marker && !s->data_partitioning){ const int bits_count= get_bits_count(&s->gb); const int bits_left = s->gb.size_in_bits - bits_count; if(bits_left==0){ s->padding_bug_score+=16; } else if(bits_left != 1){ int v= show_bits(&s->gb, 8); v|= 0x7F >> (7-(bits_count&7)); if(v==0x7F && bits_left<=8) s->padding_bug_score--; else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16) s->padding_bug_score+= 4; else s->padding_bug_score++; } } if(s->workaround_bugs&FF_BUG_AUTODETECT){ if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/) s->workaround_bugs |= FF_BUG_NO_PADDING; else s->workaround_bugs &= ~FF_BUG_NO_PADDING; } // handle formats which don't have unique end markers if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly int left= get_bits_left(&s->gb); int max_extra=7; /* no markers in M$ crap */ if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I) max_extra+= 17; /* buggy padding but the frame should still end approximately at the bitstream end */ if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE))) max_extra+= 48; else if((s->workaround_bugs&FF_BUG_NO_PADDING)) max_extra+= 256*256*256*64; if(left>max_extra){ av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24)); } else if(left<0){ av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left); }else ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END); return 0; } av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n", get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score); ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask); return -1; } int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; MpegEncContext *s = avctx->priv_data; int ret; AVFrame *pict = data; #ifdef PRINT_FRAME_TIME uint64_t time= rdtsc(); #endif s->flags= avctx->flags; s->flags2= avctx->flags2; /* no supplementary picture */ if (buf_size == 0) { /* special case for last picture */ if (s->low_delay==0 && s->next_picture_ptr) { *pict= *(AVFrame*)s->next_picture_ptr; s->next_picture_ptr= NULL; *data_size = sizeof(AVFrame); } return 0; } if(s->flags&CODEC_FLAG_TRUNCATED){ int next; if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){ next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size); }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){ next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size); }else{ av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n"); return -1; } if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 ) return buf_size; } retry: if(s->divx_packed && s->bitstream_buffer_size){ int i; for(i=0; i<buf_size-3; i++){ if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){ if(buf[i+3]==0xB0){ av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n"); s->bitstream_buffer_size=0; } break; } } } if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8); }else init_get_bits(&s->gb, buf, buf_size*8); s->bitstream_buffer_size=0; if (!s->context_initialized) { if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix return -1; } /* We need to set current_picture_ptr before reading the header, * otherwise we cannot store anyting in there */ if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) { int i= ff_find_unused_picture(s, 0); if (i < 0) return i; s->current_picture_ptr= &s->picture[i]; } /* let's go :-) */ if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) { ret= ff_wmv2_decode_picture_header(s); } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) { ret = msmpeg4_decode_picture_header(s); } else if (CONFIG_MPEG4_DECODER && s->h263_pred) { if(s->avctx->extradata_size && s->picture_number==0){ GetBitContext gb; init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8); ret = ff_mpeg4_decode_picture_header(s, &gb); } ret = ff_mpeg4_decode_picture_header(s, &s->gb); } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) { ret = ff_intel_h263_decode_picture_header(s); } else if (CONFIG_FLV_DECODER && s->h263_flv) { ret = ff_flv_decode_picture_header(s); } else { ret = h263_decode_picture_header(s); } if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size); /* skip if the header was thrashed */ if (ret < 0){ av_log(s->avctx, AV_LOG_ERROR, "header damaged\n"); return -1; } avctx->has_b_frames= !s->low_delay; if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ if(s->stream_codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") || s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("SIPP") ) s->xvid_build= 0; #if 0 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc s->xvid_build= 0; #endif } if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0) s->divx_version= 400; //divx 4 } if(s->xvid_build>=0 && s->divx_version>=0){ s->divx_version= s->divx_build= -1; } if(s->workaround_bugs&FF_BUG_AUTODETECT){ if(s->codec_tag == AV_RL32("XVIX")) s->workaround_bugs|= FF_BUG_XVID_ILACE; if(s->codec_tag == AV_RL32("UMP4")){ s->workaround_bugs|= FF_BUG_UMP4; } if(s->divx_version>=500 && s->divx_build<1814){ s->workaround_bugs|= FF_BUG_QPEL_CHROMA; } if(s->divx_version>502 && s->divx_build<1814){ s->workaround_bugs|= FF_BUG_QPEL_CHROMA2; } if(s->xvid_build<=3U) s->padding_bug_score= 256*256*256*64; if(s->xvid_build<=1U) s->workaround_bugs|= FF_BUG_QPEL_CHROMA; if(s->xvid_build<=12U) s->workaround_bugs|= FF_BUG_EDGE; if(s->xvid_build<=32U) s->workaround_bugs|= FF_BUG_DC_CLIP; #define SET_QPEL_FUNC(postfix1, postfix2) \ s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\ s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\ s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2; if(s->lavc_build<4653U) s->workaround_bugs|= FF_BUG_STD_QPEL; if(s->lavc_build<4655U) s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE; if(s->lavc_build<4670U){ s->workaround_bugs|= FF_BUG_EDGE; } if(s->lavc_build<=4712U) s->workaround_bugs|= FF_BUG_DC_CLIP; if(s->divx_version>=0) s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE; //printf("padding_bug_score: %d\n", s->padding_bug_score); if(s->divx_version==501 && s->divx_build==20020416) s->padding_bug_score= 256*256*256*64; if(s->divx_version<500U){ s->workaround_bugs|= FF_BUG_EDGE; } if(s->divx_version>=0) s->workaround_bugs|= FF_BUG_HPEL_CHROMA; #if 0 if(s->divx_version==500) s->padding_bug_score= 256*256*256*64; /* very ugly XVID padding bug detection FIXME/XXX solve this differently * Let us hope this at least works. */ if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0) s->workaround_bugs|= FF_BUG_NO_PADDING; if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok s->workaround_bugs|= FF_BUG_NO_PADDING; #endif } if(s->workaround_bugs& FF_BUG_STD_QPEL){ SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c) SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c) SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c) SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c) SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c) SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c) SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c) SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c) SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c) SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c) SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c) SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c) } if(avctx->debug & FF_DEBUG_BUGS) av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n", s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build, s->divx_packed ? "p" : ""); #if HAVE_MMX 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)) { avctx->idct_algo= FF_IDCT_XVIDMMX; avctx->coded_width= 0; // force reinit // dsputil_init(&s->dsp, avctx); s->picture_number=0; } #endif /* After H263 & mpeg4 header decode we have the height, width,*/ /* and other parameters. So then we could init the picture */ /* FIXME: By the way H263 decoder is evolving it should have */ /* an H263EncContext */ if ( s->width != avctx->coded_width || s->height != avctx->coded_height) { /* H.263 could change picture size any time */ ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat s->parse_context.buffer=0; MPV_common_end(s); s->parse_context= pc; } if (!s->context_initialized) { avcodec_set_dimensions(avctx, s->width, s->height); goto retry; } if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I)) s->gob_index = ff_h263_get_gob_height(s); // for skipping the frame s->current_picture.f.pict_type = s->pict_type; s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I; /* skip B-frames if we don't have reference frames */ if(s->last_picture_ptr==NULL && (s->pict_type==AV_PICTURE_TYPE_B || s->dropable)) return get_consumed_bytes(s, buf_size); if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B) || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I) || avctx->skip_frame >= AVDISCARD_ALL) return get_consumed_bytes(s, buf_size); if(s->next_p_frame_damaged){ if(s->pict_type==AV_PICTURE_TYPE_B) return get_consumed_bytes(s, buf_size); else s->next_p_frame_damaged=0; } if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==AV_PICTURE_TYPE_B){ s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab; s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab; }else if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){ s->me.qpel_put= s->dsp.put_qpel_pixels_tab; s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab; }else{ s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab; s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab; } if(MPV_frame_start(s, avctx) < 0) return -1; if (!s->divx_packed) ff_thread_finish_setup(avctx); if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) { ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer); goto frame_end; } if (avctx->hwaccel) { if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0) return -1; } ff_er_frame_start(s); //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type //which is not available before MPV_frame_start() if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){ ret = ff_wmv2_decode_secondary_picture_header(s); if(ret<0) return ret; if(ret==1) goto intrax8_decoded; } /* decode each macroblock */ s->mb_x=0; s->mb_y=0; ret = decode_slice(s); while(s->mb_y<s->mb_height){ if(s->msmpeg4_version){ 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) break; }else{ int prev_x=s->mb_x, prev_y=s->mb_y; if(ff_h263_resync(s)<0) break; if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x) s->error_occurred = 1; } if(s->msmpeg4_version<4 && s->h263_pred) ff_mpeg4_clean_buffers(s); if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA; } if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I) if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){ s->error_status_table[s->mb_num-1]= ER_MB_ERROR; } assert(s->bitstream_buffer_size==0); frame_end: /* divx 5.01+ bistream reorder stuff */ if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){ int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3); int startcode_found=0; if(buf_size - current_pos > 7){ int i; for(i=current_pos; i<buf_size-4; i++){ if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){ startcode_found=!(buf[i+4]&0x40); break; } } } if(startcode_found){ av_fast_malloc( &s->bitstream_buffer, &s->allocated_bitstream_buffer_size, buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE); if (!s->bitstream_buffer) return AVERROR(ENOMEM); memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos); s->bitstream_buffer_size= buf_size - current_pos; } } intrax8_decoded: ff_er_frame_end(s); if (avctx->hwaccel) { if (avctx->hwaccel->end_frame(avctx) < 0) return -1; } MPV_frame_end(s); assert(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type); assert(s->current_picture.f.pict_type == s->pict_type); if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) { *pict= *(AVFrame*)s->current_picture_ptr; } else if (s->last_picture_ptr != NULL) { *pict= *(AVFrame*)s->last_picture_ptr; } if(s->last_picture_ptr || s->low_delay){ *data_size = sizeof(AVFrame); ff_print_debug_info(s, pict); } #ifdef PRINT_FRAME_TIME av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time); #endif return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size); } AVCodec ff_h263_decoder = { .name = "h263", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_H263, .priv_data_size = sizeof(MpegEncContext), .init = ff_h263_decode_init, .close = ff_h263_decode_end, .decode = ff_h263_decode_frame, .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, .flush= ff_mpeg_flush, .max_lowres= 3, .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"), .pix_fmts= ff_hwaccel_pixfmt_list_420, };