int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; MpegEncContext *s = avctx->priv_data; int ret; AVFrame *pict = data; 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) { if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0) return ret; s->next_picture_ptr= NULL; *got_frame = 1; } return 0; } if(s->flags&CODEC_FLAG_TRUNCATED){ int next; if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){ next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size); }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){ next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size); }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){ 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 AVERROR(EINVAL); } 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 ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix return ret; } /* 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 = ff_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 == AV_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 = ff_h263_decode_picture_header(s); } if (ret < 0 || ret==FRAME_SKIPPED) { if ( s->width != avctx->coded_width || s->height != avctx->coded_height) { av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n"); s->width = avctx->coded_width; s->height= avctx->coded_height; } } 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 ret; } 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("ZMP4") || 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; 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==AV_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 == AV_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; ff_dct_common_init(s); goto retry; } #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 || s->context_reinit) { /* H.263 could change picture size any time */ s->context_reinit = 0; avcodec_set_dimensions(avctx, s->width, s->height); if ((ret = ff_MPV_common_frame_size_change(s))) return ret; } if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_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->droppable)) 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->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 ((ret = ff_MPV_frame_start(s, avctx)) < 0) return ret; if (!s->divx_packed && !avctx->hwaccel) 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 ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0) return ret; } ff_mpeg_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 ff_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 frame_end; } /* 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_left(&s->gb)<0) 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->er.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 || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){ s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR; } av_assert1(s->bitstream_buffer_size==0); frame_end: ff_er_frame_end(&s->er); if (avctx->hwaccel) { if ((ret = avctx->hwaccel->end_frame(avctx)) < 0) return ret; } ff_MPV_frame_end(s); /* divx 5.01+ bitstream reorder stuff */ /* Since this clobbers the input buffer and hwaccel codecs still need the * data during hwaccel->end_frame we should not do this any earlier */ if(s->codec_id==AV_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; } } if (!s->divx_packed && avctx->hwaccel) ff_thread_finish_setup(avctx); av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type); av_assert1(s->current_picture.f.pict_type == s->pict_type); if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) { if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0) return ret; ff_print_debug_info(s, s->current_picture_ptr, pict); ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1); } else if (s->last_picture_ptr != NULL) { if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0) return ret; ff_print_debug_info(s, s->last_picture_ptr, pict); ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1); } if(s->last_picture_ptr || s->low_delay){ if ( pict->format == AV_PIX_FMT_YUV420P && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) { int x, y, p; av_frame_make_writable(pict); for (p=0; p<3; p++) { int w = FF_CEIL_RSHIFT(pict-> width, !!p); int h = FF_CEIL_RSHIFT(pict->height, !!p); int linesize = pict->linesize[p]; for (y=0; y<(h>>1); y++) for (x=0; x<w; x++) FFSWAP(int, pict->data[p][x + y*linesize], pict->data[p][x + (h-1-y)*linesize]); } } *got_frame = 1; } return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size); }