sys_decoder_shpdec.cpp

完整的RTP RTSP代码库

					else						skip_right = skip_hor;
					if ( j-skip_hor <0)			skip_left = j+2;
					else						skip_left = skip_hor;

					*(smb_data+i*width+j)= (ArDecodeSymbol (enh_intra_v_prob [contextSIVertical(smb_data+i*width+j,skip_right, skip_left,skip_upper,skip_bottom)], m_parcodec, m_pbitstrmIn)) ? MPEG4_OPAQUE : MPEG4_TRANSPARENT;

					if(skip_bottom == v_scan_freq)	skip_upper = v_scan_freq;
					else							skip_upper = v_scan_freq*2;
				}
			}
			num_loop_hor--;
		}
	}
}

Void CVideoObjectDecoder::HorizontalXORdecoding (Int num_loop_hor, Int num_loop_ver, Bool residual_scanning_hor, Bool residual_scanning_ver, Bool* HorSamplingChk, Bool* VerSamplingChk)
{
  //	Int iSizePredBAB = m_iWidthCurrBAB - 2*BAB_BORDER + 2*MC_BAB_BORDER;
  //	Int iSizeMB = m_iWidthCurrBAB - 2*BAB_BORDER;
	PixelC* ppxlcDst  = m_rgpxlcCaeSymbol + m_iWidthCurrBAB * BAB_BORDER + BAB_BORDER;

	{	
	  Int		i, j; // , xor_type=0;
		Int		start_v=0, start_h=0;
		Int		width=20, height=20;
		//		UChar	xor_value=0;
		Int		prev=0, next=0;
		PixelC* smb_data = ppxlcDst;	
		Int skip_ver=0, skip_upper=0, skip_bottom=0;
		Int h_scan_freq=1, v_scan_freq=1;

		i=0;	
		while(*(VerSamplingChk+i) == 1)	i++;
		while(*(VerSamplingChk+i) == 0)	i++;
		int tmp = i;

		if ( residual_scanning_ver) {
			start_h = 0;
			start_v = 0;
			v_scan_freq=1<<num_loop_ver; 
			h_scan_freq=1;
			skip_ver = v_scan_freq;

		if( tmp-(1<<num_loop_ver) >= 0 )				start_v = tmp-(1<<num_loop_ver);
		else if( tmp+(1<<num_loop_ver) <= MB_SIZE-1 )	start_v = tmp+(1<<(num_loop_ver)) ;
		else printf("Out of Sampling Ratio\n");

			for(i=start_v;i<(height-4);i+=v_scan_freq){
				if( *(VerSamplingChk+i) == 1) continue;
				for(j=start_h;j<(width-4);j+=h_scan_freq){
					if(i-v_scan_freq < -2)	prev=*(smb_data+(-2)*width+j);
					else 				prev=*(smb_data+(i-v_scan_freq)*width+j);
					if(i+v_scan_freq > 17)	next=*(smb_data+(17)*width+j);
					else				next=*(smb_data+(i+v_scan_freq)*width+j);

					if ( i+skip_ver >15)	skip_bottom = MB_SIZE+1-i;
					else					skip_bottom = skip_ver;
					if ( i-skip_ver <0)		skip_upper = i+2;
					else					skip_upper = skip_ver;

					if(prev==next)  *(smb_data+i*width+j)=prev;
					else			*(smb_data+i*width+j)= (ArDecodeSymbol (enh_intra_h_prob [contextSIHorizontal(smb_data+i*width+j,skip_upper,skip_bottom)], m_parcodec, m_pbitstrmIn)) ? MPEG4_OPAQUE : MPEG4_TRANSPARENT;
				}
			}
		}

		i=0;	
		while(*(VerSamplingChk+i) == 1)	i++;
		while(*(VerSamplingChk+i) == 0)	i++;
		if(i>start_v && residual_scanning_ver) tmp = start_v;
		else tmp = i;

		while (num_loop_ver >0){
			start_h = 0;
			start_v = 0;
			v_scan_freq=1<<num_loop_ver; 
			h_scan_freq=1;
			skip_ver = 1<<(num_loop_ver-1);

			if( tmp-(1<<(num_loop_ver-1)) >= 0 ) 	tmp = start_v = tmp-(1<<(num_loop_ver-1));
			else									start_v = tmp+(1<<(num_loop_ver-1)) ;

			skip_ver = 1<<(num_loop_ver-1);

			for(i=start_v;i<(height-4);i+=v_scan_freq){
				for(j=start_h;j<(width-4);j+=h_scan_freq){
					if(i-skip_ver < -2)	prev=*(smb_data+(-2)*width+j);
					else 					prev=*(smb_data+(i-skip_ver)*width+j);
					if(i+skip_ver > 17)	next=*(smb_data+(17)*width+j);
					else					next=*(smb_data+(i+skip_ver)*width+j);
					if(i - skip_ver < 0)	skip_upper = i +2;
					else					skip_upper = skip_ver;
					if(i + skip_ver > 15)	skip_bottom = MB_SIZE+1 - i ;
					else					skip_bottom = skip_ver;

					if(prev==next)	*(smb_data+i*width+j)=prev;
					else			*(smb_data+i*width+j)= (ArDecodeSymbol (enh_intra_h_prob [contextSIHorizontal(smb_data+i*width+j,skip_upper,skip_bottom)], m_parcodec, m_pbitstrmIn)) ? MPEG4_OPAQUE : MPEG4_TRANSPARENT;
				}
			}
			num_loop_ver--;
		}
	}

}

Void CVideoObjectDecoder::HorizontalFulldecoding (Int num_loop_hor, Int num_loop_ver, Bool residual_scanning_hor, Bool residual_scanning_ver, Bool* HorSamplingChk, Bool* VerSamplingChk)
{
  //	Int iSizeMB = m_iWidthCurrBAB - 2*BAB_BORDER;
	PixelC* ppxlcDst  = m_rgpxlcCaeSymbol + m_iWidthCurrBAB * BAB_BORDER + BAB_BORDER;

	{	
	  Int		i, j;// , xor_type=0;
		Int		start_v=0, start_h=0;
		Int		width=20, height=20;
		//		UChar	xor_value=0;
		//		Int		prev=0, next=0;
		PixelC* smb_data = ppxlcDst;	
		Int		skip_ver=0, skip_upper=0, skip_bottom=0;
		Int		h_scan_freq=1, v_scan_freq=1;

		i=0;	
		while(*(VerSamplingChk+i) == 1)	i++;
		while(*(VerSamplingChk+i) == 0)	i++;
		int tmp = i;

		if ( residual_scanning_ver) {
			start_h = 0;
			start_v = 0;
			v_scan_freq = 1<<num_loop_ver; 
			h_scan_freq = 1;
			skip_ver = v_scan_freq;

			if( tmp-(1<<num_loop_ver) >= 0 ) 				start_v = tmp-(1<<num_loop_ver);
			else if( tmp+(1<<num_loop_ver) <= MB_SIZE-1 )	start_v = tmp+(1<<(num_loop_ver)) ;
			else printf("Out of Sampling Ratio\n");

			for(i=start_v;i<(height-4);i+=v_scan_freq){
				if( *(VerSamplingChk+i) == 1) continue;
				for(j=start_h;j<(width-4);j+=h_scan_freq){
					if ( i+skip_ver >15)	skip_bottom = MB_SIZE+1-i;
					else					skip_bottom = skip_ver;
					if ( i-skip_ver <0)		skip_upper = i+2;
					else					skip_upper = skip_ver;
					*(smb_data+i*width+j)= (ArDecodeSymbol (enh_intra_h_prob [contextSIHorizontal(smb_data+i*width+j,skip_upper,skip_bottom)], m_parcodec, m_pbitstrmIn)) ? MPEG4_OPAQUE : MPEG4_TRANSPARENT;
				}
			}
		}

		i=0;	
		while(*(VerSamplingChk+i) == 1)	i++;
		while(*(VerSamplingChk+i) == 0)	i++;
		if(i>start_v && residual_scanning_ver) tmp = start_v;
		else tmp = i;

		while (num_loop_ver >0){
			start_h = 0;
			start_v = 0;
			v_scan_freq=1<<num_loop_ver; 
			h_scan_freq=1;
			skip_ver = 1<<(num_loop_ver-1);

			if( tmp-(1<<(num_loop_ver-1)) >= 0 )	tmp = start_v = tmp-(1<<(num_loop_ver-1));
			else									start_v = tmp+(1<<(num_loop_ver-1)) ;

			skip_ver = 1<<(num_loop_ver-1);

			for(i=start_v;i<(height-4);i+=v_scan_freq){
				for(j=start_h;j<(width-4);j+=h_scan_freq){

				if(i - skip_ver < 0)	skip_upper = i +2;
				else					skip_upper = skip_ver;
				if(i + skip_ver > 15)	skip_bottom = MB_SIZE+1 - i ;
				else					skip_bottom = skip_ver;

				*(smb_data+i*width+j)= (ArDecodeSymbol (enh_intra_h_prob [contextSIHorizontal(smb_data+i*width+j,skip_upper,skip_bottom)], m_parcodec, m_pbitstrmIn)) ? MPEG4_OPAQUE : MPEG4_TRANSPARENT;
				}
			}
			num_loop_ver--;
		}
	}
}
//~OBSS_SAIT_991015

Int CVideoObjectDecoder::shpMdTableIndex (const CMBMode* pmbmd, Int iMBX, Int iMBY)
{	
	//get previous shape codes; 
	//	Added for error resilient mode by Toshiba(1997-11-14)
	Bool bLeftBndry, bRightTopBndry, bTopBndry, bLeftTopBndry;
	Int iMBnum = VPMBnum(iMBX, iMBY);
	bLeftBndry = bVPNoLeft(iMBnum, iMBX);
	bTopBndry = bVPNoTop(iMBnum);
	bRightTopBndry = bVPNoRightTop(iMBnum, iMBX);
	bLeftTopBndry = bVPNoLeftTop(iMBnum, iMBX);

	ShapeMode shpmdTop	= !bTopBndry ? (pmbmd - m_iNumMBX)->m_shpmd : ALL_TRANSP;
	ShapeMode shpmdTopR	= !bRightTopBndry ? (pmbmd - m_iNumMBX + 1)->m_shpmd : ALL_TRANSP;
	ShapeMode shpmdTopL	= !bLeftTopBndry ? (pmbmd - m_iNumMBX - 1)->m_shpmd : ALL_TRANSP;
	ShapeMode shpmdLeft	= !bLeftBndry ? (pmbmd - 1)->m_shpmd : ALL_TRANSP;
	return (shpmdTopL * 81 +  shpmdTop * 27 + shpmdTopR * 9 + shpmdLeft * 3);

	//const CMBMode* pmbmdTop = pmbmd - m_iNumMBX;
	//ShapeMode shpmdTop		= (iMBY > 0) ? pmbmdTop->m_shpmd : ALL_TRANSP;
	//ShapeMode shpmdTopR	= (iMBY > 0 && iMBX < m_iNumMBX - 1) ? (pmbmdTop + 1)->m_shpmd : ALL_TRANSP;
	//ShapeMode shpmdTopL	= (iMBY > 0 && iMBX > 0) ? (pmbmdTop - 1)->m_shpmd : ALL_TRANSP;
	//ShapeMode shpmdLeft		= (iMBX > 0) ? (pmbmd - 1)->m_shpmd : ALL_TRANSP;
	//return (shpmdTopL * 81 +  shpmdTop * 27 + shpmdTopR * 9 + shpmdLeft * 3);
	// End Toshiba(1997-11-14)
}

Void CVideoObjectDecoder::decodeIntraCaeBAB (PixelC* ppxlcBYMB, PixelC* ppxlcBYFrm)
{
	if (m_volmd.bNoCrChange == TRUE || m_pbitstrmIn->getBits (1) == 0)	{
		m_iInverseCR = 1;
		m_iWidthCurrBAB = BAB_SIZE;
		copyLeftTopBorderFromVOP (ppxlcBYFrm, m_ppxlcReconCurrBAB);  //used for upsample and CAE
		m_rgpxlcCaeSymbol = m_ppxlcReconCurrBAB;		//assign encoding buffer
		if (m_pbitstrmIn->getBits (1) == 1) 
			decodeIntraCAEH ();			//right bottom border made on the fly
		else
			decodeIntraCAEV ();
	}
	else	{
		if (m_pbitstrmIn->getBits (1) == 0)	{
			m_iInverseCR = 2;
			m_iWidthCurrBAB = 12;
			subsampleLeftTopBorderFromVOP (ppxlcBYFrm, m_ppxlcCurrMBBYDown2);
			m_rgpxlcCaeSymbol = m_ppxlcCurrMBBYDown2;		//assign encoding buffer
		}
		else {
			m_iInverseCR = 4;
			m_iWidthCurrBAB = 8;
			subsampleLeftTopBorderFromVOP (ppxlcBYFrm, m_ppxlcCurrMBBYDown4);
			m_rgpxlcCaeSymbol = m_ppxlcCurrMBBYDown4;		//assign encoding buffer
		}
		if (m_pbitstrmIn->getBits (1) == 1) 
			decodeIntraCAEH ();     //right bottom border made on the fly
		else
			decodeIntraCAEV (); 

		upSampleShape(ppxlcBYFrm,m_rgpxlcCaeSymbol,m_ppxlcReconCurrBAB);
	}
	
	copyReconShapeToMbAndRef (ppxlcBYMB, ppxlcBYFrm, m_ppxlcReconCurrBAB, TOTAL_BAB_SIZE, BAB_BORDER);
}

Void CVideoObjectDecoder::decodeIntraCAEH ()
{
	StartArDecoder (m_parcodec, m_pbitstrmIn);
	PixelC* ppxlcDstRow = m_rgpxlcCaeSymbol + m_iWidthCurrBAB * BAB_BORDER + BAB_BORDER;
	for (Int iRow = BAB_BORDER; iRow < m_iWidthCurrBAB - BAB_BORDER; iRow++)	{
		PixelC* ppxlcDst = ppxlcDstRow;
		for (Int iCol = BAB_BORDER; iCol < m_iWidthCurrBAB - BAB_BORDER; iCol++)	{
			Int iContext = contextIntra (ppxlcDst);//printf("%d ",iContext);
			*ppxlcDst++ = (ArDecodeSymbol (gCAEintraProb [iContext], m_parcodec, m_pbitstrmIn)) ? MPEG4_OPAQUE : MPEG4_TRANSPARENT;
		}
		*ppxlcDst = *(ppxlcDst - 1);
		*(ppxlcDst + 1) = *ppxlcDst;		//make right border on the fly
		ppxlcDstRow += m_iWidthCurrBAB;
	}//printf("\n\n");
	StopArDecoder (m_parcodec, m_pbitstrmIn);
	PixelC* ppxlcDst = m_rgpxlcCaeSymbol + 
		m_iWidthCurrBAB * (m_iWidthCurrBAB - BAB_BORDER) + BAB_BORDER;
	for (Int iCol = BAB_BORDER; iCol < m_iWidthCurrBAB; iCol++)	{
		//make bottom border
		*ppxlcDst = *(ppxlcDst - m_iWidthCurrBAB);
		*(ppxlcDst + m_iWidthCurrBAB) = *ppxlcDst;
		ppxlcDst++;
	}
}

Void CVideoObjectDecoder::decodeIntraCAEV ()
{
	StartArDecoder (m_parcodec, m_pbitstrmIn);
	PixelC* ppxlcDstCol = m_rgpxlcCaeSymbol + m_iWidthCurrBAB * BAB_BORDER + BAB_BORDER;
	for (Int iCol = BAB_BORDER; iCol < m_iWidthCurrBAB - BAB_BORDER; iCol++)	{
		PixelC* ppxlcDst = ppxlcDstCol;
		for (Int iRow = BAB_BORDER; iRow < m_iWidthCurrBAB - BAB_BORDER; iRow++)	{
			Int iContext = contextIntraTranspose (ppxlcDst);
			*ppxlcDst = (ArDecodeSymbol (gCAEintraProb [iContext], m_parcodec, m_pbitstrmIn)) ? MPEG4_OPAQUE : MPEG4_TRANSPARENT;
			ppxlcDst += m_iWidthCurrBAB;
		}
		*ppxlcDst = *(ppxlcDst - m_iWidthCurrBAB);
		*(ppxlcDst + m_iWidthCurrBAB) = *ppxlcDst;		//make bottom border on the fly
		ppxlcDstCol++;
	}
	StopArDecoder (m_parcodec, m_pbitstrmIn);
	PixelC* ppxlcDst = m_rgpxlcCaeSymbol + (m_iWidthCurrBAB - BAB_BORDER) + m_iWidthCurrBAB * BAB_BORDER;
	for (Int iRow = BAB_BORDER; iRow < m_iWidthCurrBAB; iRow++)	{
		//make right border
		*ppxlcDst = *(ppxlcDst - 1);
		*(ppxlcDst + 1) = *ppxlcDst;
		ppxlcDst += m_iWidthCurrBAB;
	}
}


Void CVideoObjectDecoder::decodeInterCAEH (const PixelC *ppxlcPredBAB)
{
	StartArDecoder (m_parcodec, m_pbitstrmIn);
	Int iSizePredBAB = m_iWidthCurrBAB - 2*BAB_BORDER + 2*MC_BAB_BORDER;
	Int iSizeMB = m_iWidthCurrBAB - 2*BAB_BORDER;
	PixelC* ppxlcDstRow  = m_rgpxlcCaeSymbol + m_iWidthCurrBAB * BAB_BORDER + BAB_BORDER;
	const PixelC* ppxlcPredRow = ppxlcPredBAB + iSizePredBAB * MC_BAB_BORDER + MC_BAB_BORDER;
	for (Int iRow = 0; iRow < iSizeMB; iRow++)	{
		PixelC* ppxlcDst = ppxlcDstRow;
		const PixelC* ppxlcPred = ppxlcPredRow;
		for (Int iCol = 0; iCol < iSizeMB; iCol++)	{
			Int iContext = contextInter (ppxlcDst, ppxlcPred);
			*ppxlcDst++ = (ArDecodeSymbol (gCAEinterProb [iContext], m_parcodec, m_pbitstrmIn)) ? MPEG4_OPAQUE : MPEG4_TRANSPARENT;
			ppxlcPred++;
		}
		*ppxlcDst = *(ppxlcDst - 1);
		*(ppxlcDst + 1) = *ppxlcDst;		//make right border on the fly
		ppxlcDstRow += m_iWidthCurrBAB;
		ppxlcPredRow += iSizePredBAB;
	}
	StopArDecoder (m_parcodec, m_pbitstrmIn);
	PixelC* ppxlcDst = m_rgpxlcCaeSymbol + 
		m_iWidthCurrBAB * (m_iWidthCurrBAB - BAB_BORDER) + BAB_BORDER;
	for (Int iCol = BAB_BORDER; iCol < m_iWidthCurrBAB; iCol++)	{
		//make bottom border
		*ppxlcDst = *(ppxlcDst - m_iWidthCurrBAB);
		*(ppxlcDst + m_iWidthCurrBAB) = *ppxlcDst;
		ppxlcDst++;
	}
}

Void CVideoObjectDecoder::decodeInterCAEV (const PixelC *ppxlcPredBAB)
{
	StartArDecoder (m_parcodec, m_pbitstrmIn);
	Int iSizePredBAB = m_iWidthCurrBAB - 2*BAB_BORDER + 2*MC_BAB_BORDER;
	Int iSizeMB = m_iWidthCurrBAB - 2*BAB_BORDER;
	PixelC* ppxlcDstCol  = m_rgpxlcCaeSymbol + m_iWidthCurrBAB * BAB_BORDER + BAB_BORDER;
	const PixelC* ppxlcPredCol = ppxlcPredBAB + iSizePredBAB * MC_BAB_BORDER + MC_BAB_BORDER;
	for (Int iCol = 0; iCol < iSizeMB;iCol++)	{
		PixelC* ppxlcDst = ppxlcDstCol;
		const PixelC* ppxlcPred = ppxlcPredCol;
		for (Int iRow = 0; iRow < iSizeMB; iRow++)	{
			Int iContext = contextInterTranspose (ppxlcDst, ppxlcPred);
			*ppxlcDst = (ArDecodeSymbol (gCAEinterProb [iContext], m_parcodec, m_pbitstrmIn)) ? MPEG4_OPAQUE : MPEG4_TRANSPARENT;
			ppxlcDst += m_iWidthCurrBAB;
			ppxlcPred += iSizePredBAB;
		}
		*ppxlcDst = *(ppxlcDst - m_iWidthCurrBAB);
		*(ppxlcDst + m_iWidthCurrBAB) = *ppxlcDst;		//make bottom border on the fly
		ppxlcDstCol++;
		ppxlcPredCol++;
	}
	StopArDecoder (m_parcodec, m_pbitstrmIn);
	PixelC* ppxlcDst = m_rgpxlcCaeSymbol + (m_iWidthCurrBAB - BAB_BORDER) + m_iWidthCurrBAB * BAB_BORDER;
	for (Int iRow = BAB_BORDER; iRow < m_iWidthCurrBAB; iRow++)	{
		//make right border
		*ppxlcDst = *(ppxlcDst - 1);
		*(ppxlcDst + 1) = *ppxlcDst;
		ppxlcDst += m_iWidthCurrBAB;
	}
}

Void CVideoObjectDecoder::decodeMVDS (CMotionVector& mvDiff)
{
	mvDiff.iMVX = m_pentrdecSet->m_pentrdecShapeMV1->decodeSymbol ();			
	if (mvDiff.iMVX != 0)
		if (m_pbitstrmIn->getBits (1) == 0)
			mvDiff.iMVX *= -1;
	if (mvDiff.iMVX == 0)	
		mvDiff.iMVY = m_pentrdecSet->m_pentrdecShapeMV2->decodeSymbol () + 1;			
	else
		mvDiff.iMVY = m_pentrdecSet->m_pentrdecShapeMV1->decodeSymbol ();			
	if (mvDiff.iMVY != 0)
		if (m_pbitstrmIn->getBits (1) == 0)
			mvDiff.iMVY *= -1;
	mvDiff.computeTrueMV ();
}