/************************************************************************ * * getgob.c, gob decoding for tmndecode (H.263 decoder) * Copyright (C) 1995, 1996 Telenor R&D, Norway * Karl Olav Lillevold * * Contacts: * Karl Olav Lillevold , or * Robert Danielsen * * Telenor Research and Development http://www.nta.no/brukere/DVC/ * P.O.Box 83 tel.: +47 63 84 84 00 * N-2007 Kjeller, Norway fax.: +47 63 81 00 76 * * Changed by Klaus Stuhlmueller ************************************************************************/ /* * Disclaimer of Warranty * * These software programs are available to the user without any * license fee or royalty on an "as is" basis. Telenor Research and * Development disclaims any and all warranties, whether express, * implied, or statuary, including any implied warranties or * merchantability or of fitness for a particular purpose. In no * event shall the copyright-holder be liable for any incidental, * punitive, or consequential damages of any kind whatsoever arising * from the use of these programs. * * This disclaimer of warranty extends to the user of these programs * and user's customers, employees, agents, transferees, successors, * and assigns. * * Telenor Research and Development does not represent or warrant that * the programs furnished hereunder are free of infringement of any * third-party patents. * * Commercial implementations of H.263, including shareware, are * subject to royalty fees to patent holders. Many of these patents * are general enough such that they are unavoidable regardless of * implementation design. * */ /* * modified by Wayne Ellis BT Labs to run Annex E Arithmetic Decoding * * * based on mpeg2decode, (C) 1994, MPEG Software Simulation Group * and mpeg2play, (C) 1994 Stefan Eckart * */ #include #include #include #include "Util.h" #include "h263decoder.h" #include "h263decoder.p" #include "bitIn.h" #include "indices.h" #include "sactbls.h" /* private prototypes*/ static void _clearblock (short block[12][64], int comp); static int _motion_decode (int long_vectors, int vec,int pmv); static int _find_pmv (H263Global *h263Data, int x, int y, int block, int comp); static void _addblock (H263Global *h263Data, int comp, int bx, int by,int addflag); static void addblock_ext (short *bp, int comp, int bx, int by, int w, int h, unsigned char *y, unsigned char *u, unsigned char *v, int addflag); static void _reconblock_b (H263Global *h263Data, int comp, int bx, int by, int mode, int bdx, int bdy); static void _find_bidir_limits (int vec, int *start, int*stop, int nhv); static void _find_bidir_chroma_limits (int vec, int *start, int*stop); void interpolate_image (unsigned char *in, unsigned char *out, int width, int height); /* not included in h263+ code */ int modb_tab[3] = {0, 1, 2}; int cumf_MODB[4]={16383, 6062, 2130, 0}; int cumf_MCBPC[22]={16383, 4105, 3088, 2367, 1988, 1621, 1612, 1609, 1608, 496, 353, 195, 77, 22, 17, 12, 5, 4, 3, 2, 1, 0}; /* decode all macroblocks of the current gob */ void H263getGOB(H263Global *h263Data, int dec_until_sync) { const int blk_cnt = 6; int comp; int MBA, MBAmax; int bx, by; int COD=0,MCBPC, CBPY, CBP=0, CBPB=0, MODB=0, Mode=0, DQUANT; int COD_index, CBPY_index, MODB_index, DQUANT_index, MCBPC_index; int INTRADC_index, YCBPB_index, UVCBPB_index, mvdbx_index, mvdby_index; int mvx, mvy, mvy_index, mvx_index, pmv0, pmv1, xpos, ypos, i,k; int mvdbx=0, mvdby=0, pmvdbx=0, pmvdby=0, YCBPB, UVCBPB, gobheader_read; int startmv,stopmv,xoffset,bsize,last_done=0,pCBP=0,pCBPB=0,pCOD=0; int DQ_tab[4] = {-1,-2,1,2}; short *bp; /* number of macroblocks per picture */ MBAmax = h263Data->mbs_in_gob; MBA = 0; /* macroblock address */ if (h263Data->gob == 0) { h263Data->newgob = 0; gobheader_read = 0; xpos = -1; ypos = 0; } else { h263Data->newgob = 1; gobheader_read = 1; xpos = 0; ypos = h263Data->gob * h263Data->mbs_in_gob / h263Data->mb_width; } h263Data->fault = 0; for (;;) { #ifdef TRACE if (trace) printf("MB %d\n",MBA); #endif resync: /* This version of the decoder does not resync on every possible error, and it does not do all possible error checks. It is not difficult to make it much more error robust, but I do not think it is necessary to include this in the freely available version. */ if (h263Data->fault) { printf("Warning: A Fault Condition Has Occurred - Resyncing \n"); #if 0 startcode(h263Data->bs); /* sync on new startcode */ #endif h263Data->fault = 0; } if (MBA >= MBAmax) { /* Check return conditions */ h263Data->decGOBsCounter++; h263Data->decGOBs[h263Data->gob] = 1; if (dec_until_sync) { if (!(ShowBits(h263Data->bs,22)>>6)) /* startcode */ return; else if (h263Data->bs->BufferPtr > h263Data->bs->GOBend) return; else { /* No sync following, thus continue decoding */ h263Data->newgob = 0; MBA = 0; xpos = -1; last_done = 0; COD = 0; } } else return; } #if 0 finish_gob: /* SAC specific label */ #endif if (!gobheader_read) { xpos++; if (xpos >= h263Data->mb_width) { xpos = 0; ypos++; } if (xpos == 0 && ypos > 0) h263Data->newgob = 0; } else gobheader_read = 0; if (MBA >= MBAmax) return; /* all macroblocks decoded */ read_cod: if (h263Data->syntax_arith_coding) { if (h263Data->pict_type == PCT_INTER) { COD_index = _decode_a_symbol(h263Data->bs,cumf_COD); COD = codtab[COD_index]; #ifdef TRACE if (trace) { printf("Arithmetic Decoding Debug \n"); printf("COD Index: %d COD: %d \n", COD_index, COD); } #endif } else COD = 0; /* COD not used in I-pictures, set to zero */ } else { if (h263Data->pict_type == PCT_INTER) COD = ShowBits(h263Data->bs,1); else COD = 0; /* Intra picture -> not skipped */ } if (!COD) { /* COD == 0 --> not skipped */ if (h263Data->syntax_arith_coding) { if (h263Data->pict_type == PCT_INTER) { MCBPC_index = _decode_a_symbol(h263Data->bs,cumf_MCBPC); MCBPC = mcbpctab[MCBPC_index]; } else { MCBPC_index = _decode_a_symbol(h263Data->bs,cumf_MCBPC_intra); MCBPC = mcbpc_intratab[MCBPC_index]; } #ifdef TRACE if (trace) printf("MCBPC Index: %d MCBPC: %d \n",MCBPC_index, MCBPC); #endif } else { if (h263Data->pict_type == PCT_INTER) ConsumeBits(h263Data->bs, 1); /* flush COD bit */ if (h263Data->pict_type == PCT_INTRA) MCBPC = _getMCBPCintra(h263Data); else MCBPC = _getMCBPC(h263Data); } if (h263Data->fault) goto resync; if (MCBPC == 255) { /* stuffing */ goto read_cod; /* read next COD without advancing MB count */ } else { /* normal MB data */ Mode = MCBPC & 7; /* MODB and CBPB */ if (h263Data->pb_frame) { CBPB = 0; if (h263Data->syntax_arith_coding) { MODB_index = _decode_a_symbol(h263Data->bs,cumf_MODB); MODB = modb_tab[MODB_index]; } else MODB = _getMODB(h263Data); #ifdef TRACE if (trace) printf("MODB: %d\n", MODB); #endif if (MODB == PBMODE_CBPB_MVDB) { if (h263Data->syntax_arith_coding) { for(i=0; i<4; i++) { YCBPB_index = _decode_a_symbol(h263Data->bs,cumf_YCBPB); YCBPB = ycbpb_tab[YCBPB_index]; CBPB |= (YCBPB << (6-1-i)); } for(i=4; i<6; i++) { UVCBPB_index = _decode_a_symbol(h263Data->bs,cumf_UVCBPB); UVCBPB = uvcbpb_tab[UVCBPB_index]; CBPB |= (UVCBPB << (6-1-i)); } } else CBPB = GetBits(h263Data->bs,6); #ifdef TRACE if (trace) printf("CBPB = %d\n",CBPB); #endif } } if (h263Data->syntax_arith_coding) { if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q) { /* Intra */ CBPY_index = _decode_a_symbol(h263Data->bs,cumf_CBPY_intra); CBPY = cbpy_intratab[CBPY_index]; } else { CBPY_index = _decode_a_symbol(h263Data->bs,cumf_CBPY); CBPY = cbpytab[CBPY_index]; } #ifdef TRACE if (trace) printf("CBPY Index: %d CBPY %d \n",CBPY_index, CBPY); #endif } else CBPY = _getCBPY(h263Data); /* Decode Mode and CBP */ if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q) {/* Intra */ if (!h263Data->syntax_arith_coding) CBPY = CBPY^15; /* needed in huffman coding only */ } CBP = (CBPY << 2) | (MCBPC >> 4); } if (Mode == MODE_INTER4V && !h263Data->adv_pred_mode) if (!h263Data->quiet) printf("8x8 vectors not allowed in normal prediction mode\n"); /* Could set fault-flag and resync */ if (Mode == MODE_INTER_Q || Mode == MODE_INTRA_Q) { /* Read DQUANT if necessary */ if (h263Data->syntax_arith_coding) { DQUANT_index = _decode_a_symbol(h263Data->bs,cumf_DQUANT); DQUANT = dquanttab[DQUANT_index] - 2; h263Data->quant +=DQUANT; #ifdef TRACE if (trace) printf("DQUANT Index: %d DQUANT %d \n",DQUANT_index, DQUANT); #endif } else { DQUANT = GetBits(h263Data->bs,2); h263Data->quant += DQ_tab[DQUANT]; #ifdef TRACE if (trace) { printf("DQUANT ("); printbits(DQUANT,2,2); printf("): %d = %d\n",DQUANT,DQ_tab[DQUANT]); } #endif } if (h263Data->quant > 31 || h263Data->quant < 1) { if (!h263Data->quiet) printf("Quantizer out of range: clipping\n"); h263Data->quant = MAX(1,MIN(31,h263Data->quant)); /* could set fault-flag and resync here */ } } /* motion vectors */ if (Mode == MODE_INTER || Mode == MODE_INTER_Q || Mode == MODE_INTER4V || h263Data->pb_frame) { if (Mode == MODE_INTER4V) { startmv = 1; stopmv = 4;} else { startmv = 0; stopmv = 0;} for (k = startmv; k <= stopmv; k++) { if (h263Data->syntax_arith_coding) { mvx_index = _decode_a_symbol(h263Data->bs,cumf_MVD); mvx = mvdtab[mvx_index]; mvy_index = _decode_a_symbol(h263Data->bs,cumf_MVD); mvy = mvdtab[mvy_index]; #ifdef TRACE if (trace) printf("mvx_index: %d mvy_index: %d \n", mvy_index, mvx_index); #endif } else { mvx = _getTMNMV(h263Data); mvy = _getTMNMV(h263Data); } pmv0 = _find_pmv(h263Data,xpos,ypos,k,0); pmv1 = _find_pmv(h263Data,xpos,ypos,k,1); mvx = _motion_decode(h263Data->long_vectors, mvx, pmv0); mvy = _motion_decode(h263Data->long_vectors, mvy, pmv1); #ifdef TRACE if (trace) { printf("mvx: %d\n", mvx); printf("mvy: %d\n", mvy); } #endif /* Check mv's to prevent seg.faults when error rate is high */ if (!h263Data->mv_outside_frame) { bsize = k ? 8 : 16; xoffset = k ? (((k-1)&1)<<3) : 0; /* checking only integer component */ if ((xpos<<4) + (mvx/2) + xoffset < 0 || (xpos<<4) + (mvx/2) + xoffset > (h263Data->mb_width<<4) - bsize) { if (!h263Data->quiet) printf("mvx (%d) out of range (xpos is %d): searching for sync\n",mvx,xpos); h263Data->fault = 1; } xoffset = k ? (((k-1)&2)<<2) : 0; if ((ypos<<4) + (mvy/2) + xoffset < 0 || (ypos<<4) + (mvy/2) + xoffset > (h263Data->mb_height<<4) - bsize) { if (!h263Data->quiet) printf("mvy (%d) out of range (ypos is %d): searching for sync\n",mvy,ypos); h263Data->fault = 1; } } h263Data->MV[0][k][ypos+1][xpos+1] = mvx; h263Data->MV[1][k][ypos+1][xpos+1] = mvy; } /* PB frame delta vectors */ if (h263Data->pb_frame) { if (MODB == PBMODE_MVDB || MODB == PBMODE_CBPB_MVDB) { if (h263Data->syntax_arith_coding) { mvdbx_index = _decode_a_symbol(h263Data->bs,cumf_MVD); mvdbx = mvdtab[mvdbx_index]; mvdby_index = _decode_a_symbol(h263Data->bs,cumf_MVD); mvdby = mvdtab[mvdby_index]; } else { mvdbx = _getTMNMV(h263Data); mvdby = _getTMNMV(h263Data); } mvdbx = _motion_decode(h263Data->long_vectors, mvdbx, 0); mvdby = _motion_decode(h263Data->long_vectors, mvdby, 0); /* This will not work if the PB deltas are so large they require the second colums of the motion vector VLC table to be used. To fix this it is necessary to calculate the MV predictor for the PB delta: TRB*MV/TRD here, and use this as the second parameter to motion_decode(). The B vector itself will then be returned from motion_decode(). This will have to be changed to the PB delta again, since it is the PB delta which is used later in this program. I don't think PB deltas outside the range mentioned above is useful, but you never know... */ #ifdef TRACE if (trace) { printf("MVDB x: %d\n", mvdbx); printf("MVDB y: %d\n", mvdby); } #endif } else { mvdbx = 0; mvdby = 0; } } } if (h263Data->fault) goto resync; } else { /* COD == 1 --> skipped MB */ if (MBA >= MBAmax) return; /* all macroblocks decoded */ if (!h263Data->syntax_arith_coding) if (h263Data->pict_type == PCT_INTER) ConsumeBits(h263Data->bs,1); Mode = MODE_UNCODED; /* Reset CBP */ CBP = CBPB = 0; /* reset motion vectors */ h263Data->MV[0][0][ypos+1][xpos+1] = 0; h263Data->MV[1][0][ypos+1][xpos+1] = 0; mvdbx = 0; mvdby = 0; } /* Store Mode*/ h263Data->modemap[ypos+1][xpos+1] = Mode; if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q) if (!h263Data->pb_frame) h263Data->MV[0][0][ypos+1][xpos+1] = h263Data->MV[1][0][ypos+1][xpos+1] = 0; reconstruct_mb: /* pixel coordinates of top left corner of current macroblock */ /* one delayed because of OBMC */ if (xpos > 0) { bx = 16*(xpos-1); by = 16*ypos; } else { bx = h263Data->coded_picture_width-16; by = 16*(ypos-1); } if (MBA > 0) { Mode = h263Data->modemap[by/16+1][bx/16+1]; /* forward motion compensation for B-frame */ if (h263Data->pb_frame) reconstructH263(h263Data,bx,by,0,pmvdbx,pmvdby); /* motion compensation for P-frame */ if (Mode == MODE_INTER || Mode == MODE_INTER_Q || Mode == MODE_INTER4V || Mode == MODE_UNCODED) reconstructH263(h263Data,bx,by,1,0,0); /* copy or add block data into P-picture */ for (comp=0; compblock[comp]); _addblock(h263Data,comp,bx,by,0); } else if ( (pCBP & (1<<(blk_cnt-1-comp))) ) { /* No need to to do this for blocks with no coeffs */ _idct(h263Data->block[comp]); _addblock(h263Data,comp,bx,by,1); } } if (h263Data->pb_frame) { /* add block data into B-picture */ for (comp = 6; compadv_pred_mode) _reconblock_b(h263Data, comp-6,bx,by,Mode,pmvdbx,pmvdby); if ( (pCBPB & (1<<(blk_cnt-1-comp%6))) ) { _idct(h263Data->block[comp]); _addblock(h263Data,comp,bx,by,1); } } } } /* end if (MBA > 0) */ if (!COD) { Mode = h263Data->modemap[ypos+1][xpos+1]; /* decode blocks */ for (comp=0; compblock, comp); if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q) { /* Intra */ bp = h263Data->block[comp]; if(h263Data->syntax_arith_coding) { INTRADC_index = _decode_a_symbol(h263Data->bs,cumf_INTRADC); bp[0] = intradctab[INTRADC_index]; #ifdef TRACE if (trace) printf("INTRADC Index: %d INTRADC: %d \n", INTRADC_index,bp[0]); #endif } else { bp[0] = GetBits(h263Data->bs,8); #ifdef TRACE if (trace) { printf("DC[%d]: (",comp); printbits((int)bp[0],8,8); printf("): %d\n",(int)bp[0]); } #endif } if (bp[0] == 128) if (!h263Data->quiet) fprintf(stderr,"Illegal DC-coeff: 1000000\n"); if (bp[0] == 255) /* Spec. in H.26P, not in TMN4 */ bp[0] = 128; bp[0] *= 8; /* Iquant */ if ( (CBP & (1<<(blk_cnt-1-comp))) ) { if (!h263Data->syntax_arith_coding) _getblock(h263Data,comp,0); else _get_sac_block(h263Data,comp,0); } } else { /* Inter */ if ( (CBP & (1<<(blk_cnt-1-comp))) ) { if (!h263Data->syntax_arith_coding) _getblock(h263Data,comp,1); else _get_sac_block(h263Data,comp,1); } } if (h263Data->fault) goto resync; } /* Decode B blocks */ if (h263Data->pb_frame) { for (comp=6; compblock, comp); if ( (CBPB & (1<<(blk_cnt-1-comp%6))) ) { if (!h263Data->syntax_arith_coding) _getblock(h263Data,comp,1); else _get_sac_block(h263Data,comp,1); } if (h263Data->fault) goto resync; } } } /* advance to next macroblock */ MBA++; pCBP = CBP; pCBPB = CBPB; pCOD = COD; pmvdbx = mvdbx; pmvdby = mvdby; fflush(stdout); if (MBA >= MBAmax && !last_done) { COD = 1; xpos = 0; ypos++; last_done = 1; goto reconstruct_mb; } } } /* decode all macroblocks of the current gob */ int H263parseGOB(H263Global *h263Data, int *mbInd, int *mbQuant, MVField *mvField, int indOffset) { const int blk_cnt = 6; int comp; int MBA, MBAmax; int bx, by; int COD=0,MCBPC, CBPY, CBP=0, CBPB=0, MODB=0, Mode=0, DQUANT; int COD_index, CBPY_index, MODB_index, DQUANT_index, MCBPC_index; int INTRADC_index, YCBPB_index, UVCBPB_index, mvdbx_index, mvdby_index; int mvx=0, mvy=0, mvy_index, mvx_index, pmv0, pmv1, xpos, ypos, i,k; int mvdbx=0, mvdby=0, pmvdbx=0, pmvdby=0, YCBPB, UVCBPB, gobheader_read; int startmv,stopmv,xoffset,bsize,last_done=0,pCBP=0,pCBPB=0,pCOD=0; int DQ_tab[4] = {-1,-2,1,2}; short *bp; int bsInd=0; int mn; int prev_temp_ref = h263Data->prev_temp_ref; if (mbInd != NULL) bsInd = 8 * (int)(h263Data->bs->BufferPtr - h263Data->bs->ByteBuffer) + h263Data->bs->ValidBits; if (!_getheader(h263Data)) { return 0; } h263Data->prev_temp_ref = prev_temp_ref; h263Data->trd = h263Data->temp_ref - prev_temp_ref; /* number of macroblocks per picture */ MBAmax = h263Data->mbs_in_gob; MBA = 0; /* macroblock address */ if (h263Data->gob == 0) { h263Data->newgob = 0; gobheader_read = 0; xpos = -1; ypos = 0; } else { h263Data->newgob = 1; gobheader_read = 1; xpos = 0; ypos = h263Data->gob * h263Data->mbs_in_gob / h263Data->mb_width; } mn = h263Data->gob * h263Data->mbs_in_gob; h263Data->fault = 0; for (;;) { #ifdef TRACE if (trace) printf("MB %d\n",MBA); #endif resync: /* This version of the decoder does not resync on every possible error, and it does not do all possible error checks. It is not difficult to make it much more error robust, but I do not think it is necessary to include this in the freely available version. */ if (h263Data->fault) { printf("Warning: A Fault Condition Has Occurred - Resyncing \n"); h263Data->fault = 0; } if (MBA >= MBAmax) { /* Check return conditions */ h263Data->bs->BufState = GOB_EMPTY; return 1; } if (!gobheader_read) { xpos++; if (xpos >= h263Data->mb_width) { xpos = 0; ypos++; } if (xpos == 0 && ypos > 0) h263Data->newgob = 0; } else gobheader_read = 0; read_cod: if (mbInd != NULL) if (MBA > 0) mbInd[mn] = 8 * (int)(h263Data->bs->BufferPtr - h263Data->bs->ByteBuffer) + h263Data->bs->ValidBits + indOffset; else mbInd[mn] = bsInd + indOffset; if (mbQuant != NULL) mbQuant[mn] = h263Data->quant; if (h263Data->syntax_arith_coding) { if (h263Data->pict_type == PCT_INTER) { COD_index = _decode_a_symbol(h263Data->bs,cumf_COD); COD = codtab[COD_index]; #ifdef TRACE if (trace) { printf("Arithmetic Decoding Debug \n"); printf("COD Index: %d COD: %d \n", COD_index, COD); } #endif } else COD = 0; /* COD not used in I-pictures, set to zero */ } else { if (h263Data->pict_type == PCT_INTER) COD = ShowBits(h263Data->bs,1); else COD = 0; /* Intra picture -> not skipped */ } if (!COD) { /* COD == 0 --> not skipped */ if (h263Data->syntax_arith_coding) { if (h263Data->pict_type == PCT_INTER) { MCBPC_index = _decode_a_symbol(h263Data->bs,cumf_MCBPC); MCBPC = mcbpctab[MCBPC_index]; } else { MCBPC_index = _decode_a_symbol(h263Data->bs,cumf_MCBPC_intra); MCBPC = mcbpc_intratab[MCBPC_index]; } #ifdef TRACE if (trace) printf("MCBPC Index: %d MCBPC: %d \n",MCBPC_index, MCBPC); #endif } else { if (h263Data->pict_type == PCT_INTER) ConsumeBits(h263Data->bs, 1); /* flush COD bit */ if (h263Data->pict_type == PCT_INTRA) MCBPC = _getMCBPCintra(h263Data); else MCBPC = _getMCBPC(h263Data); } if (h263Data->fault) goto resync; if (MCBPC == 255) { /* stuffing */ goto read_cod; /* read next COD without advancing MB count */ } else { /* normal MB data */ Mode = MCBPC & 7; /* MODB and CBPB */ if (h263Data->pb_frame) { CBPB = 0; if (h263Data->syntax_arith_coding) { MODB_index = _decode_a_symbol(h263Data->bs,cumf_MODB); MODB = modb_tab[MODB_index]; } else MODB = _getMODB(h263Data); #ifdef TRACE if (trace) printf("MODB: %d\n", MODB); #endif if (MODB == PBMODE_CBPB_MVDB) { if (h263Data->syntax_arith_coding) { for(i=0; i<4; i++) { YCBPB_index = _decode_a_symbol(h263Data->bs,cumf_YCBPB); YCBPB = ycbpb_tab[YCBPB_index]; CBPB |= (YCBPB << (6-1-i)); } for(i=4; i<6; i++) { UVCBPB_index = _decode_a_symbol(h263Data->bs,cumf_UVCBPB); UVCBPB = uvcbpb_tab[UVCBPB_index]; CBPB |= (UVCBPB << (6-1-i)); } } else CBPB = GetBits(h263Data->bs,6); #ifdef TRACE if (trace) printf("CBPB = %d\n",CBPB); #endif } } if (h263Data->syntax_arith_coding) { if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q) { /* Intra */ CBPY_index = _decode_a_symbol(h263Data->bs,cumf_CBPY_intra); CBPY = cbpy_intratab[CBPY_index]; } else { CBPY_index = _decode_a_symbol(h263Data->bs,cumf_CBPY); CBPY = cbpytab[CBPY_index]; } #ifdef TRACE if (trace) printf("CBPY Index: %d CBPY %d \n",CBPY_index, CBPY); #endif } else CBPY = _getCBPY(h263Data); /* Decode Mode and CBP */ if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q) {/* Intra */ if (!h263Data->syntax_arith_coding) CBPY = CBPY^15; /* needed in huffman coding only */ } CBP = (CBPY << 2) | (MCBPC >> 4); } if (Mode == MODE_INTER4V && !h263Data->adv_pred_mode) if (!h263Data->quiet) printf("8x8 vectors not allowed in normal prediction mode\n"); /* Could set fault-flag and resync */ if (Mode == MODE_INTER_Q || Mode == MODE_INTRA_Q) { /* Read DQUANT if necessary */ if (h263Data->syntax_arith_coding) { DQUANT_index = _decode_a_symbol(h263Data->bs,cumf_DQUANT); DQUANT = dquanttab[DQUANT_index] - 2; h263Data->quant +=DQUANT; #ifdef TRACE if (trace) printf("DQUANT Index: %d DQUANT %d \n",DQUANT_index, DQUANT); #endif } else { DQUANT = GetBits(h263Data->bs,2); h263Data->quant += DQ_tab[DQUANT]; #ifdef TRACE if (trace) { printf("DQUANT ("); printbits(DQUANT,2,2); printf("): %d = %d\n",DQUANT,DQ_tab[DQUANT]); } #endif } if (h263Data->quant > 31 || h263Data->quant < 1) { if (!h263Data->quiet) printf("Quantizer out of range: clipping\n"); h263Data->quant = MAX(1,MIN(31,h263Data->quant)); /* could set fault-flag and resync here */ } } /* motion vectors */ if (Mode == MODE_INTER || Mode == MODE_INTER_Q || Mode == MODE_INTER4V || h263Data->pb_frame) { if (Mode == MODE_INTER4V) { startmv = 1; stopmv = 4;} else { startmv = 0; stopmv = 0;} for (k = startmv; k <= stopmv; k++) { if (h263Data->syntax_arith_coding) { mvx_index = _decode_a_symbol(h263Data->bs,cumf_MVD); mvx = mvdtab[mvx_index]; mvy_index = _decode_a_symbol(h263Data->bs,cumf_MVD); mvy = mvdtab[mvy_index]; #ifdef TRACE if (trace) printf("mvx_index: %d mvy_index: %d \n", mvy_index, mvx_index); #endif } else { mvx = _getTMNMV(h263Data); mvy = _getTMNMV(h263Data); } pmv0 = _find_pmv(h263Data,xpos,ypos,k,0); pmv1 = _find_pmv(h263Data,xpos,ypos,k,1); mvx = _motion_decode(h263Data->long_vectors, mvx, pmv0); mvy = _motion_decode(h263Data->long_vectors, mvy, pmv1); #ifdef TRACE if (trace) { printf("mvx: %d\n", mvx); printf("mvy: %d\n", mvy); } #endif /* Check mv's to prevent seg.faults when error rate is high */ if (!h263Data->mv_outside_frame) { bsize = k ? 8 : 16; xoffset = k ? (((k-1)&1)<<3) : 0; /* checking only integer component */ if ((xpos<<4) + (mvx/2) + xoffset < 0 || (xpos<<4) + (mvx/2) + xoffset > (h263Data->mb_width<<4) - bsize) { if (!h263Data->quiet) printf("mvx out of range: searching for sync\n"); h263Data->fault = 1; } xoffset = k ? (((k-1)&2)<<2) : 0; if ((ypos<<4) + (mvy/2) + xoffset < 0 || (ypos<<4) + (mvy/2) + xoffset > (h263Data->mb_height<<4) - bsize) { if (!h263Data->quiet) printf("mvy out of range: searching for sync\n"); h263Data->fault = 1; } } h263Data->MV[0][k][ypos+1][xpos+1] = mvx; h263Data->MV[1][k][ypos+1][xpos+1] = mvy; } /* PB frame delta vectors */ if (h263Data->pb_frame) { if (MODB == PBMODE_MVDB || MODB == PBMODE_CBPB_MVDB) { if (h263Data->syntax_arith_coding) { mvdbx_index = _decode_a_symbol(h263Data->bs,cumf_MVD); mvdbx = mvdtab[mvdbx_index]; mvdby_index = _decode_a_symbol(h263Data->bs,cumf_MVD); mvdby = mvdtab[mvdby_index]; } else { mvdbx = _getTMNMV(h263Data); mvdby = _getTMNMV(h263Data); } mvdbx = _motion_decode(h263Data->long_vectors, mvdbx, 0); mvdby = _motion_decode(h263Data->long_vectors, mvdby, 0); /* This will not work if the PB deltas are so large they require the second colums of the motion vector VLC table to be used. To fix this it is necessary to calculate the MV predictor for the PB delta: TRB*MV/TRD here, and use this as the second parameter to motion_decode(). The B vector itself will then be returned from motion_decode(). This will have to be changed to the PB delta again, since it is the PB delta which is used later in this program. I don't think PB deltas outside the range mentioned above is useful, but you never know... */ #ifdef TRACE if (trace) { printf("MVDB x: %d\n", mvdbx); printf("MVDB y: %d\n", mvdby); } #endif } else { mvdbx = 0; mvdby = 0; } } } if (h263Data->fault) goto resync; } else { /* COD == 1 --> skipped MB */ if (MBA >= MBAmax) return 1; /* all macroblocks decoded */ if (!h263Data->syntax_arith_coding) if (h263Data->pict_type == PCT_INTER) ConsumeBits(h263Data->bs,1); Mode = MODE_UNCODED; /* Reset CBP */ CBP = CBPB = 0; /* reset motion vectors */ h263Data->MV[0][0][ypos+1][xpos+1] = 0; h263Data->MV[1][0][ypos+1][xpos+1] = 0; mvdbx = 0; mvdby = 0; } /* Store Mode*/ h263Data->modemap[ypos+1][xpos+1] = Mode; /* Store mode and motion vectors */ if (mvField != NULL) { mvField->mode[mn] = Mode; if (Mode == MODE_INTER || Mode == MODE_INTER_Q) { mvField->mx[mn] = mvx; mvField->my[mn] = mvy; } else { mvField->mx[mn] = 0; mvField->my[mn] = 0; } } if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q) if (!h263Data->pb_frame) h263Data->MV[0][0][ypos+1][xpos+1] = h263Data->MV[1][0][ypos+1][xpos+1] = 0; reconstruct_mb: /* pixel coordinates of top left corner of current macroblock */ /* one delayed because of OBMC */ if (xpos > 0) { bx = 16*(xpos-1); by = 16*ypos; } else { bx = h263Data->coded_picture_width-16; by = 16*(ypos-1); } if (!COD) { Mode = h263Data->modemap[ypos+1][xpos+1]; /* decode blocks */ for (comp=0; compblock[comp]; if(h263Data->syntax_arith_coding) { INTRADC_index = _decode_a_symbol(h263Data->bs,cumf_INTRADC); bp[0] = intradctab[INTRADC_index]; #ifdef TRACE if (trace) printf("INTRADC Index: %d INTRADC: %d \n", INTRADC_index,bp[0]); #endif } else { bp[0] = GetBits(h263Data->bs,8); #ifdef TRACE if (trace) { printf("DC[%d]: (",comp); printbits((int)bp[0],8,8); printf("): %d\n",(int)bp[0]); } #endif } if (bp[0] == 128) if (!h263Data->quiet) fprintf(stderr,"Illegal DC-coeff: 1000000\n"); if (bp[0] == 255) /* Spec. in H.26P, not in TMN4 */ bp[0] = 128; bp[0] *= 8; /* Iquant */ if ( (CBP & (1<<(blk_cnt-1-comp))) ) { if (!h263Data->syntax_arith_coding) _getblock(h263Data,comp,0); else _get_sac_block(h263Data,comp,0); } } else { /* Inter */ if ( (CBP & (1<<(blk_cnt-1-comp))) ) { if (!h263Data->syntax_arith_coding) _getblock(h263Data,comp,1); else _get_sac_block(h263Data,comp,1); } } if (h263Data->fault) goto resync; } /* Decode B blocks */ if (h263Data->pb_frame) { for (comp=6; compsyntax_arith_coding) _getblock(h263Data,comp,1); else _get_sac_block(h263Data,comp,1); } if (h263Data->fault) goto resync; } } } /* advance to next macroblock */ MBA++; mn++; pCBP = CBP; pCBPB = CBPB; pCOD = COD; pmvdbx = mvdbx; pmvdby = mvdby; fflush(stdout); if (MBA >= MBAmax && !last_done) { COD = 1; xpos = 0; ypos++; last_done = 1; goto reconstruct_mb; } } } /* Decode an intra block of an intra frame */ void H263getIFrameMB(Bitstream *bs, int bx, int by, int w, int h, unsigned char *y, unsigned char *u, unsigned char *v, int *quant_p, int quiet, int *fault_p) { const int blk_cnt = 6, bquant = 0; short block[6][64]; short *bp; int mcbpc, cbp, cbpy, mode; int comp; int dquant; int DQ_tab[4] = {-1,-2,1,2}; do { mcbpc = getMCBPCintra_ext(bs, quiet, fault_p); } while (mcbpc == 255); mode = mcbpc & 7; cbpy = getCBPY_ext(bs, quiet, fault_p); /* Decode Mode and CBP */ if (mode == MODE_INTRA || mode == MODE_INTRA_Q) {/* Intra */ cbpy = cbpy^15; /* needed in huffman coding only */ } cbp = (cbpy << 2) | (mcbpc >> 4); if (mode == MODE_INTRA_Q) { /* Read DQUANT if necessary */ dquant = GetBits(bs,2); *quant_p += DQ_tab[dquant]; #ifdef TRACE if (trace) { printf("DQUANT ("); printbits(dquant,2,2); printf("): %d = %d\n",dquant,DQ_tab[dquant]); } #endif if (*quant_p > 31 || *quant_p < 1) { if (!quiet) printf("Quantizer out of range: clipping\n"); *quant_p = MAX(1,MIN(31,*quant_p)); /* could set fault-flag and resync here */ } } /*if (*fault_p) goto resync;*/ /* decode blocks */ for (comp = 0; comp < blk_cnt; comp++) { _clearblock(block, comp); bp = block[comp]; bp[0] = GetBits(bs,8); #ifdef TRACE if (trace) { printf("DC[%d]: (",comp); printbits((int)bp[0],8,8); printf("): %d\n",(int)bp[0]); } #endif if (bp[0] == 128) if (!quiet) fprintf(stderr,"Illegal DC-coeff: 1000000\n"); if (bp[0] == 255) /* Spec. in H.26P, not in TMN4 */ bp[0] = 128; bp[0] *= 8; /* Iquant */ if ( (cbp & (1<<(blk_cnt-1-comp))) ) getblock_ext(bs, bp, comp, 0, *quant_p, bquant, quiet, fault_p); /* reconstruct MB */ /* copy or add block data into picture */ /* inverse DCT */ _idct(bp); addblock_ext(bp, comp, bx, by, w, h, y, u, v, 0); } } void H263parseIFrameMB(Bitstream *bs, int w, int h, int *quant_p, int quiet, int *fault_p) { const int blk_cnt = 6, bquant = 0; short block[6][64]; short *bp; int mcbpc, cbp, cbpy, mode; int comp; int dquant; int DQ_tab[4] = {-1,-2,1,2}; do { mcbpc = getMCBPCintra_ext(bs, quiet, fault_p); } while (mcbpc == 255); mode = mcbpc & 7; cbpy = getCBPY_ext(bs, quiet, fault_p); /* Decode Mode and CBP */ if (mode == MODE_INTRA || mode == MODE_INTRA_Q) {/* Intra */ cbpy = cbpy^15; /* needed in huffman coding only */ } cbp = (cbpy << 2) | (mcbpc >> 4); if (mode == MODE_INTRA_Q) { /* Read DQUANT if necessary */ dquant = GetBits(bs,2); *quant_p += DQ_tab[dquant]; #ifdef TRACE if (trace) { printf("DQUANT ("); printbits(dquant,2,2); printf("): %d = %d\n",dquant,DQ_tab[dquant]); } #endif if (*quant_p > 31 || *quant_p < 1) { if (!quiet) printf("Quantizer out of range: clipping\n"); *quant_p = MAX(1,MIN(31,*quant_p)); /* could set fault-flag and resync here */ } } /*if (*fault_p) goto resync;*/ /* decode blocks */ for (comp = 0; comp < blk_cnt; comp++) { bp = block[comp]; bp[0] = GetBits(bs,8); #ifdef TRACE if (trace) { printf("DC[%d]: (",comp); printbits((int)bp[0],8,8); printf("): %d\n",(int)bp[0]); } #endif if (bp[0] == 128) if (!quiet) fprintf(stderr,"Illegal DC-coeff: 1000000\n"); if (bp[0] == 255) /* Spec. in H.26P, not in TMN4 */ bp[0] = 128; bp[0] *= 8; /* Iquant */ if ( (cbp & (1<<(blk_cnt-1-comp))) ) getblock_ext(bs, bp, comp, 0, *quant_p, bquant, quiet, fault_p); } } /* set block to zero */ static void _clearblock(short block[12][64], int comp) { int *bp; int i; bp = (int *)block[comp]; for (i=0; i<8; i++) { bp[0] = bp[1] = bp[2] = bp[3] = 0; bp += 4; } } /* move/add 8x8-Block from block[comp] to refframe or bframe */ static void _addblock(H263Global *h263Data, int comp, int bx, int by, int addflag) { int cc,i, iincr, P = 1; unsigned char *rfp; short *bp; bp = h263Data->block[comp]; if (comp >= 6) { /* This is a component for B-frame forward prediction */ P = 0; addflag = 1; comp -= 6; } cc = (comp<4) ? 0 : (comp&1)+1; /* color component index */ if (cc==0) { /* luminance */ /* frame DCT coding */ if (P) rfp = h263Data->newframe[0] + h263Data->coded_picture_width*(by+((comp&2)<<2)) + bx + ((comp&1)<<3); else rfp = h263Data->bframe[0] + h263Data->coded_picture_width*(by+((comp&2)<<2)) + bx + ((comp&1)<<3); iincr = h263Data->coded_picture_width; } else { /* chrominance */ /* scale coordinates */ bx >>= 1; by >>= 1; /* frame DCT coding */ if (P) rfp = h263Data->newframe[cc] + h263Data->chrom_width*by + bx; else rfp = h263Data->bframe[cc] + h263Data->chrom_width*by + bx; iincr = h263Data->chrom_width; } if (addflag) { for (i=0; i<8; i++) { rfp[0] = clp[bp[0]+rfp[0]]; rfp[1] = clp[bp[1]+rfp[1]]; rfp[2] = clp[bp[2]+rfp[2]]; rfp[3] = clp[bp[3]+rfp[3]]; rfp[4] = clp[bp[4]+rfp[4]]; rfp[5] = clp[bp[5]+rfp[5]]; rfp[6] = clp[bp[6]+rfp[6]]; rfp[7] = clp[bp[7]+rfp[7]]; bp += 8; rfp+= iincr; } } else { for (i=0; i<8; i++) { rfp[0] = clp[bp[0]]; rfp[1] = clp[bp[1]]; rfp[2] = clp[bp[2]]; rfp[3] = clp[bp[3]]; rfp[4] = clp[bp[4]]; rfp[5] = clp[bp[5]]; rfp[6] = clp[bp[6]]; rfp[7] = clp[bp[7]]; bp += 8; rfp += iincr; } } } /* move/add 8x8-Block from block[comp] to refframe or bframe */ static void addblock_ext(short *bp, int comp, int bx, int by, int w, int h, unsigned char *y, unsigned char *u, unsigned char *v, int addflag) { int cc, i, iincr; unsigned char *rfp; if (comp >= 6) { /* This is a component for B-frame forward prediction */ addflag = 1; comp -= 6; } cc = (comp<4) ? 0 : (comp&1)+1; /* color component index */ if (cc==0) { /* luminance */ /* frame DCT coding */ rfp = y + w * (by+((comp&2)<<2)) + bx + ((comp&1)<<3); iincr = w; } else { /* chrominance */ /* scale coordinates */ bx >>= 1; by >>= 1; iincr = w>>1; /* frame DCT coding */ if (cc == 1) rfp = u + iincr*by + bx; else rfp = v + iincr*by + bx; } if (addflag) { for (i=0; i<8; i++) { rfp[0] = clp[bp[0]+rfp[0]]; rfp[1] = clp[bp[1]+rfp[1]]; rfp[2] = clp[bp[2]+rfp[2]]; rfp[3] = clp[bp[3]+rfp[3]]; rfp[4] = clp[bp[4]+rfp[4]]; rfp[5] = clp[bp[5]+rfp[5]]; rfp[6] = clp[bp[6]+rfp[6]]; rfp[7] = clp[bp[7]+rfp[7]]; bp += 8; rfp+= iincr; } } else { for (i=0; i<8; i++) { rfp[0] = clp[bp[0]]; rfp[1] = clp[bp[1]]; rfp[2] = clp[bp[2]]; rfp[3] = clp[bp[3]]; rfp[4] = clp[bp[4]]; rfp[5] = clp[bp[5]]; rfp[6] = clp[bp[6]]; rfp[7] = clp[bp[7]]; bp += 8; rfp += iincr; } } } /* bidirectionally reconstruct 8x8-Block from block[comp] to bframe */ static void _reconblock_b(H263Global *h263Data, int comp, int bx, int by, int mode, int bdx, int bdy) { int cc,i,j,k, ii; unsigned char *bfr, *ffr; int BMVx, BMVy; int xa,xb,ya,yb,x,y,xvec,yvec,mvx,mvy; int xint,xhalf,yint,yhalf,pel; int trd = h263Data->trd, trb = h263Data->trb; x = bx/16+1;y=by/16+1; if (mode == MODE_INTER4V) { if (comp < 4) { /* luma */ mvx = h263Data->MV[0][comp+1][y][x]; mvy = h263Data->MV[1][comp+1][y][x]; BMVx = (bdx == 0 ? (trb-trd)* mvx/trd : trb * mvx/trd + bdx - mvx); BMVy = (bdy == 0 ? (trb-trd)* mvy/trd : trb * mvy/trd + bdy - mvy); } else { /* chroma */ xvec = yvec = 0; for (k = 1; k <= 4; k++) { mvx = h263Data->MV[0][k][y][x]; mvy = h263Data->MV[1][k][y][x]; xvec += (bdx == 0 ? (trb-trd)* mvx/trd : trb * mvx/trd + bdx - mvx); yvec += (bdy == 0 ? (trb-trd)* mvy/trd : trb * mvy/trd + bdy - mvy); } /* chroma rounding (table 16/H.263) */ BMVx = SGN(xvec)*(roundtab[abs(xvec)%16]+(abs(xvec)/16)*2); BMVy = SGN(yvec)*(roundtab[abs(yvec)%16]+(abs(yvec)/16)*2); } } else { if (comp < 4) { /* luma */ mvx = h263Data->MV[0][0][y][x]; mvy = h263Data->MV[1][0][y][x]; BMVx = (bdx == 0 ? (trb-trd)* mvx/trd : trb * mvx/trd + bdx - mvx); BMVy = (bdy == 0 ? (trb-trd)* mvy/trd : trb * mvy/trd + bdy - mvy); } else { /* chroma */ mvx = h263Data->MV[0][0][y][x]; mvy = h263Data->MV[1][0][y][x]; xvec = (bdx == 0 ? (trb-trd)* mvx/trd : trb * mvx/trd + bdx - mvx); yvec = (bdy == 0 ? (trb-trd)* mvy/trd : trb * mvy/trd + bdy - mvy); xvec *= 4; yvec *= 4; /* chroma rounding (table 16/H.263) */ BMVx = SGN(xvec)*(roundtab[abs(xvec)%16] +(abs(xvec)/16)*2); BMVy = SGN(yvec)*(roundtab[abs(yvec)%16] +(abs(yvec)/16)*2); } } cc = (comp<4) ? 0 : (comp&1)+1; /* color component index */ if (cc==0) { /* luminance */ _find_bidir_limits(BMVx,&xa,&xb,comp&1); _find_bidir_limits(BMVy,&ya,&yb,(comp&2)>>1); bfr = h263Data->bframe[0] + h263Data->coded_picture_width*(by+((comp&2)<<2)) + bx + ((comp&1)<<3); ffr = h263Data->newframe[0] + h263Data->coded_picture_width*(by+((comp&2)<<2)) + bx + ((comp&1)<<3); ii = h263Data->coded_picture_width; } else { /* chrominance */ /* scale coordinates and vectors*/ bx >>= 1; by >>= 1; _find_bidir_chroma_limits(BMVx,&xa,&xb); _find_bidir_chroma_limits(BMVy,&ya,&yb); bfr = h263Data->bframe[cc]+h263Data->chrom_width*(by+((comp&2)<<2)) +bx+(comp&8); ffr = h263Data->newframe[cc]+h263Data->chrom_width*(by+((comp&2)<<2))+bx+(comp&8); ii = h263Data->chrom_width; } xint = BMVx>>1; xhalf = BMVx - 2*xint; yint = BMVy>>1; yhalf = BMVy - 2*yint; ffr += xint + (yint+ya)*ii; bfr += ya*ii; if (!xhalf && !yhalf) { for (j = ya; j < yb; j++) { for (i = xa; i < xb; i++) { pel = ffr[i]; bfr[i] = ((unsigned int)(pel + bfr[i]))>>1; } bfr += ii; ffr += ii; } } else if (xhalf && !yhalf) { for (j = ya; j < yb; j++) { for (i = xa; i < xb; i++) { pel = ((unsigned int)(ffr[i]+ffr[i+1]+1))>>1; bfr[i] = ((unsigned int)(pel + bfr[i]))>>1; } bfr += ii; ffr += ii; } } else if (!xhalf && yhalf) { for (j = ya; j < yb; j++) { for (i = xa; i < xb; i++) { pel = ((unsigned int)(ffr[i]+ffr[ii+i]+1))>>1; bfr[i] = ((unsigned int)(pel + bfr[i]))>>1; } bfr += ii; ffr += ii; } } else { /* if (xhalf && yhalf) */ for (j = ya; j < yb; j++) { for (i = xa; i < xb; i++) { pel = ((unsigned int)(ffr[i]+ffr[i+1]+ffr[ii+i]+ffr[ii+i+1]+2))>>2; bfr[i] = ((unsigned int)(pel + bfr[i]))>>1; } bfr += ii; ffr += ii; } } return; } static int _motion_decode(int long_vectors, int vec, int pmv) { if (vec > 31) vec -= 64; vec += pmv; if (!long_vectors) { if (vec > 31) vec -= 64; if (vec < -32) vec += 64; } else { if (pmv < -31 && vec < -63) vec += 64; if (pmv > 32 && vec > 63) vec -= 64; } return vec; } static int _find_pmv(H263Global *h263Data, int x, int y, int block, int comp) { int p1,p2,p3; int xin1,xin2,xin3; int yin1,yin2,yin3; int vec1,vec2,vec3; int l8,o8,or8; x++;y++; l8 = (h263Data->modemap[y][x-1] == MODE_INTER4V ? 1 : 0); o8 = (h263Data->modemap[y-1][x] == MODE_INTER4V ? 1 : 0); or8 = (h263Data->modemap[y-1][x+1] == MODE_INTER4V ? 1 : 0); switch (block) { case 0: vec1 = (l8 ? 2 : 0) ; yin1 = y ; xin1 = x-1; vec2 = (o8 ? 3 : 0) ; yin2 = y-1; xin2 = x; vec3 = (or8? 3 : 0) ; yin3 = y-1; xin3 = x+1; break; case 1: vec1 = (l8 ? 2 : 0) ; yin1 = y ; xin1 = x-1; vec2 = (o8 ? 3 : 0) ; yin2 = y-1; xin2 = x; vec3 = (or8? 3 : 0) ; yin3 = y-1; xin3 = x+1; break; case 2: vec1 = 1 ; yin1 = y ; xin1 = x; vec2 = (o8 ? 4 : 0) ; yin2 = y-1; xin2 = x; vec3 = (or8? 3 : 0) ; yin3 = y-1; xin3 = x+1; break; case 3: vec1 = (l8 ? 4 : 0) ; yin1 = y ; xin1 = x-1; vec2 = 1 ; yin2 = y ; xin2 = x; vec3 = 2 ; yin3 = y ; xin3 = x; break; case 4: vec1 = 3 ; yin1 = y ; xin1 = x; vec2 = 1 ; yin2 = y ; xin2 = x; vec3 = 2 ; yin3 = y ; xin3 = x; break; default: fprintf(stderr,"Illegal block number in find_pmv (getpic.c)\n"); exit(1); break; } p1 = h263Data->MV[comp][vec1][yin1][xin1]; p2 = h263Data->MV[comp][vec2][yin2][xin2]; p3 = h263Data->MV[comp][vec3][yin3][xin3]; if (h263Data->newgob && (block == 0 || block == 1 || block == 2)) p2 = NO_VEC; if (p2 == NO_VEC) { p2 = p3 = p1; } return p1+p2+p3 - MAX(p1,MAX(p2,p3)) - MIN(p1,MIN(p2,p3)); } static void _find_bidir_limits(vec, start, stop, nhv) int vec; int *start, *stop, nhv; { /* limits taken from C loop in section G5 in H.263 */ *start = MAX(0,(-vec+1)/2 - nhv*8); *stop = MIN(7,15-(vec+1)/2 - nhv*8); (*stop)++; /* I use < and not <= in the loop */ } static void _find_bidir_chroma_limits(vec, start, stop) int vec; int *start, *stop; { /* limits taken from C loop in section G5 in H.263 */ *start = MAX(0,(-vec+1)/2); *stop = MIN(7,7-(vec+1)/2); (*stop)++; /* I use < and not <= in the loop */ return; } void make_edge_image(src,dst,width,height,edge) unsigned char *src, *dst; int width,height,edge; { int i,j; unsigned char *p1,*p2,*p3,*p4; unsigned char *o1,*o2,*o3,*o4; /* center image */ p1 = dst; o1 = src; for (j = 0; j < height;j++) { for (i = 0; i < width; i++) { *(p1 + i) = *(o1 + i); } p1 += width + (edge<<1); o1 += width; } /* left and right edges */ p1 = dst-1; o1 = src; for (j = 0; j < height;j++) { for (i = 0; i < edge; i++) { *(p1 - i) = *o1; *(p1 + width + i + 1) = *(o1 + width - 1); } p1 += width + (edge<<1); o1 += width; } /* top and bottom edges */ p1 = dst; p2 = dst + (width + (edge<<1))*(height-1); o1 = src; o2 = src + width*(height-1); for (j = 0; j < edge;j++) { p1 = p1 - (width + (edge<<1)); p2 = p2 + (width + (edge<<1)); for (i = 0; i < width; i++) { *(p1 + i) = *(o1 + i); *(p2 + i) = *(o2 + i); } } /* corners */ p1 = dst - (width+(edge<<1)) - 1; p2 = p1 + width + 1; p3 = dst + (width+(edge<<1))*(height)-1; p4 = p3 + width + 1; o1 = src; o2 = o1 + width - 1; o3 = src + width*(height-1); o4 = o3 + width - 1; for (j = 0; j < edge; j++) { for (i = 0; i < edge; i++) { *(p1 - i) = *o1; *(p2 + i) = *o2; *(p3 - i) = *o3; *(p4 + i) = *o4; } p1 = p1 - (width + (edge<<1)); p2 = p2 - (width + (edge<<1)); p3 = p3 + width + (edge<<1); p4 = p4 + width + (edge<<1); } } void H263ConcealGOB(H263Global *h263Data) { int gobsize = h263Data->mbs_in_gob * 16 * 16 * sizeof(unsigned char); memcpy(h263Data->newframe[0] + h263Data->gob * gobsize, h263Data->oldrefframe[0] + h263Data->gob * gobsize, gobsize); gobsize /= 4; memcpy(h263Data->newframe[1] + h263Data->gob * gobsize, h263Data->oldrefframe[1] + h263Data->gob * gobsize, gobsize); memcpy(h263Data->newframe[2] + h263Data->gob * gobsize, h263Data->oldrefframe[2] + h263Data->gob * gobsize, gobsize); }