mcenc.cpp

此源码是在VC平台下,实现MPEG4编解码的源码

	    case BACKWARD:
		    motionCompOneBVOPReference(m_pvopcPredMB, BACKWARD, x, y, pmbmd, pmvBackward, prctMVLimitBackward);
		    computeTextureErrorWithShape();
		    break;

	    case DIRECT:
		    motionCompDirectMode(x, y, pmbmd,
                &m_rgmvRef[(PVOP_MV_PER_REF_PER_MB*(x + m_iNumMBX * y)) / MB_SIZE],
                prctMVLimitForward, prctMVLimitBackward,0);   // new change 02-19-99
		    averagePredAndComputeErrorY_WithShape();
		    averagePredAndComputeErrorUV_WithShape();
		    break;

	    case INTERPOLATE:
		    motionCompOneBVOPReference(m_pvopcPredMB,     FORWARD,  x, y, pmbmd, pmvForward, prctMVLimitForward);
		    motionCompOneBVOPReference(m_pvopcPredMBBack, BACKWARD, x, y, pmbmd, pmvBackward, prctMVLimitBackward);
		    averagePredAndComputeErrorY_WithShape();
		    averagePredAndComputeErrorUV_WithShape();
		    break;
	    }
        return;
    }
// INTERLACED
// end of new changes

	if (pmbmd->m_mbType == DIRECT || pmbmd->m_mbType == INTERPOLATE) { // Y is done when doing motion estimation
		motionCompInterpAndError_WithShape (pmvForward, pmvBackward, x, y,prctMVLimitForward,prctMVLimitBackward);
		CoordI xRefUVForward, yRefUVForward;
		mvLookupUVWithShape (pmbmd, pmvForward, xRefUVForward, yRefUVForward);
		motionCompUV (m_ppxlcPredMBU, m_ppxlcPredMBV, m_pvopcRefQ0, x, y, xRefUVForward, yRefUVForward, 0, prctMVLimitForward);
		
		CoordI xRefUVBackward, yRefUVBackward;
		mvLookupUVWithShape (pmbmd, pmvBackward, xRefUVBackward, yRefUVBackward);
		motionCompUV (m_ppxlcPredMBBackU, m_ppxlcPredMBBackV, m_pvopcRefQ1, x, y, xRefUVBackward, yRefUVBackward, 0, prctMVLimitBackward);
		averagePredAndComputeErrorUV_WithShape ();
	}
	else { 
		const CMotionVector* pmv;
		const PixelC* ppxlcRef; // point to left-top of the reference VOP
		const PixelC* ppxlcRefZoom; // point to left-top of the reference VOP
		const CVOPU8YUVBA* pvopcRef;
		CRct *prctMVLimit;
		if (pmbmd->m_mbType == FORWARD) { // Y is done when doing motion estimation
			pmv = pmvForward;
			pvopcRef = m_pvopcRefQ0;
			ppxlcRef = m_pvopcRefQ0->pixelsY (); // point to left-top of the reference VOP
			ppxlcRefZoom = m_puciRefQZoom0->pixels (); // point to left-top of the reference VOP
			prctMVLimit = prctMVLimitForward;
		}
		else {
			pmv = pmvBackward;
			pvopcRef = m_pvopcRefQ1;
			ppxlcRef = m_pvopcRefQ1->pixelsY (); // point to left-top of the reference VOP
			ppxlcRefZoom = m_puciRefQZoom1->pixels (); // point to left-top of the reference VOP
			prctMVLimit = prctMVLimitBackward;
		}
		CoordI xRefUV, yRefUV;
		mvLookupUVWithShape (pmbmd, pmv, xRefUV, yRefUV);
		motionCompEncY (ppxlcRef, ppxlcRefZoom, m_ppxlcPredMBY, MB_SIZE, pmv, x, y,prctMVLimit);
		motionCompUV (m_ppxlcPredMBU, m_ppxlcPredMBV, pvopcRef, x, y, xRefUV, yRefUV, 0, prctMVLimit);
		computeTextureErrorWithShape ();
	}
}

Void CVideoObjectEncoder::motionCompAndDiffAlpha_BVOP_MB (
	const CMotionVector* pmvForward, const CMotionVector* pmvBackward, 
	const CMBMode* pmbmd, 
	CoordI x, CoordI y,
	CRct *prctMVLimitForward,CRct *prctMVLimitBackward
)
{
	if (pmbmd->m_mbType == DIRECT || pmbmd->m_mbType == INTERPOLATE) {
		motionCompMBAEnc (pmvForward, pmbmd, m_ppxlcPredMBA, m_pvopcRefQ0,
			x, y, 0, prctMVLimitForward,0);
		motionCompMBAEnc (pmvBackward, pmbmd, m_ppxlcPredMBBackA, m_pvopcRefQ1,
			x, y, 0, prctMVLimitBackward,1);

		// average predictions
		Int i;
		for(i = 0; i<MB_SQUARE_SIZE; i++)
			m_ppxlcPredMBA[i] = (m_ppxlcPredMBA[i] + m_ppxlcPredMBBackA[i] + 1)>>1;
	}
	else { 
		const CMotionVector* pmv;
		const PixelC* ppxlcRef; // point to left-top of the reference VOP
		CRct *prctMVLimit;
		if (pmbmd->m_mbType == FORWARD) {
			pmv = pmvForward;
			ppxlcRef = m_pvopcRefQ0->pixelsA (); // point to left-top of the reference VOP
			prctMVLimit = prctMVLimitForward;
// 12.22.98 begin of changes
			if(m_vopmd.bInterlace&&pmbmd->m_bFieldMV)
				motionCompMBAEnc (pmvForward, pmbmd, m_ppxlcPredMBA, m_pvopcRefQ0,
					x, y, 0, prctMVLimitForward,0);
// end of changes
		}
		else {
			pmv = pmvBackward;
			ppxlcRef = m_pvopcRefQ1->pixelsA (); // point to left-top of the reference VOP
			prctMVLimit = prctMVLimitBackward;
// 12.22.98 begin of changes
			if(m_vopmd.bInterlace&&pmbmd->m_bFieldMV)
				motionCompMBAEnc (pmvBackward, pmbmd, m_ppxlcPredMBA, m_pvopcRefQ1,
					x, y, 0, prctMVLimitBackward,1);
// end of changes
		}
		if((!m_vopmd.bInterlace||(m_vopmd.bInterlace&&!pmbmd->m_bFieldMV))) // 12.22.98 changes
			motionComp (
				m_ppxlcPredMBA,
				ppxlcRef,
				MB_SIZE, // MB size
				x * 2 + pmv->trueMVHalfPel ().x, 
				y * 2 + pmv->trueMVHalfPel ().y,
				0,
				prctMVLimit
			);
	}
	computeAlphaError();
}

Void CVideoObjectEncoder::averagePredAndComputeErrorUV ()
{
	Int i = 0;
	for (i = 0; i < BLOCK_SQUARE_SIZE; i++) {
		m_ppxlcPredMBU [i] = (m_ppxlcPredMBU [i] + m_ppxlcPredMBBackU [i] + 1) >> 1;
		m_ppxlcPredMBV [i] = (m_ppxlcPredMBV [i] + m_ppxlcPredMBBackV [i] + 1) >> 1;
		m_ppxliErrorMBU [i] = m_ppxlcCurrMBU [i] - m_ppxlcPredMBU [i];
		m_ppxliErrorMBV [i] = m_ppxlcCurrMBV [i] - m_ppxlcPredMBV [i];
	}
}

Void CVideoObjectEncoder::averagePredAndComputeErrorUV_WithShape ()
{
	Int i = 0;
	for (i = 0; i < BLOCK_SQUARE_SIZE; i++) {
		if (m_ppxlcCurrMBBUV [i] == transpValue)
			m_ppxliErrorMBU [i] = m_ppxliErrorMBV [i] = 0;
		else {
			m_ppxlcPredMBU [i] = (m_ppxlcPredMBU [i] + m_ppxlcPredMBBackU [i] + 1) >> 1;
			m_ppxlcPredMBV [i] = (m_ppxlcPredMBV [i] + m_ppxlcPredMBBackV [i] + 1) >> 1;
			m_ppxliErrorMBU [i] = m_ppxlcCurrMBU [i] - m_ppxlcPredMBU [i];
			m_ppxliErrorMBV [i] = m_ppxlcCurrMBV [i] - m_ppxlcPredMBV [i];
		}
	}
}

// B-VOP ME/MC stuff
Int CVideoObjectEncoder::interpolateAndDiffY (
	const CMotionVector* pmvForward, const CMotionVector* pmvBackward, 
	CoordI x, CoordI y,
	CRct *prctMVLimitForward,CRct *prctMVLimitBackward
)
{
	motionCompEncY (
		m_pvopcRefQ0->pixelsY (), 
		m_puciRefQZoom0->pixels (),
		m_ppxlcPredMBY, MB_SIZE, pmvForward, x, y,
		prctMVLimitForward
	);
	/*Int iLeft  = (x << 1) + pmvBackward->m_vctTrueHalfPel.x;
	Int iRight = (y << 1) + pmvBackward->m_vctTrueHalfPel.y;	

	//make sure don't end up with a mv that points out of a frame; object-based not done
	if (!m_puciRefQZoom1->where ().includes (CRct (iLeft, iRight, iLeft + (MB_SIZE << 1), iRight + (MB_SIZE << 1))))
		return 1000000000;
	else*/
	motionCompEncY (
		m_pvopcRefQ1->pixelsY (), 
		m_puciRefQZoom1->pixels (),
		m_ppxlcPredMBBackY, MB_SIZE, pmvBackward, x, y,
		prctMVLimitBackward
	);
	Int ic;
	Int iSAD = 0;
	for (ic = 0; ic < MB_SQUARE_SIZE; ic++)
		iSAD += abs (m_ppxlcCurrMBY [ic] - ((m_ppxlcPredMBY [ic] + m_ppxlcPredMBBackY [ic] + 1) >> 1));
	return iSAD;
}

Int CVideoObjectEncoder::interpolateAndDiffY_WithShape (
	const CMotionVector* pmvForward, const CMotionVector* pmvBackward, 
	CoordI x, CoordI y,
	CRct *prctMVLimitForward,CRct *prctMVLimitBackward
)
{
	motionCompEncY (
		m_pvopcRefQ0->pixelsY (), 
		m_puciRefQZoom0->pixels (),
		m_ppxlcPredMBY, MB_SIZE, pmvForward, x, y,
		prctMVLimitForward
	);
	motionCompEncY (
		m_pvopcRefQ1->pixelsY (), 
		m_puciRefQZoom1->pixels (),
		m_ppxlcPredMBBackY, MB_SIZE, pmvBackward, x, y,
		prctMVLimitBackward
	);
	Int ic;
	Int iSAD = 0;
	for (ic = 0; ic < MB_SQUARE_SIZE; ic++) {
		if (m_ppxlcCurrMBBY [ic] != transpValue)
			iSAD += abs (m_ppxlcCurrMBY [ic] - ((m_ppxlcPredMBY [ic] + m_ppxlcPredMBBackY [ic] + 1) >> 1));
	}
	return iSAD;
}

Int CVideoObjectEncoder::interpolateAndDiffYField(
	const CMotionVector* pmvFwdTop,
	const CMotionVector* pmvFwdBot,
	const CMotionVector* pmvBakTop,
	const CMotionVector* pmvBakBot,
	CoordI x, CoordI y,
	CMBMode *pmbmd
)
{
	x <<= 1;
	y <<= 1;
	motionCompYField(m_ppxlcPredMBY,
		m_pvopcRefQ0->pixelsY () + pmbmd->m_bForwardTop * m_iFrameWidthY,
		x + pmvFwdTop->m_vctTrueHalfPel.x, y + pmvFwdTop->m_vctTrueHalfPel.y);
	motionCompYField(m_ppxlcPredMBY + MB_SIZE,
		m_pvopcRefQ0->pixelsY () + pmbmd->m_bForwardBottom * m_iFrameWidthY,
		x + pmvFwdBot->m_vctTrueHalfPel.x, y + pmvFwdBot->m_vctTrueHalfPel.y);

	motionCompYField(m_ppxlcPredMBBackY,
		m_pvopcRefQ1->pixelsY () + pmbmd->m_bBackwardTop * m_iFrameWidthY,
		x + pmvBakTop->m_vctTrueHalfPel.x, y + pmvBakTop->m_vctTrueHalfPel.y);
	motionCompYField(m_ppxlcPredMBBackY + MB_SIZE,
		m_pvopcRefQ1->pixelsY () + pmbmd->m_bBackwardBottom * m_iFrameWidthY,
		x + pmvBakBot->m_vctTrueHalfPel.x, y + pmvBakBot->m_vctTrueHalfPel.y);
	
	Int ic;
	Int iSAD = 0;
// new changes by X. Chen
	if (pmbmd->m_rgTranspStatus[0]==NONE) {
		for (ic = 0; ic < MB_SQUARE_SIZE; ic++)
			iSAD += abs (m_ppxlcCurrMBY [ic] - ((m_ppxlcPredMBY [ic] + m_ppxlcPredMBBackY [ic] + 1) >> 1));
	} else if (pmbmd->m_rgTranspStatus[0]==PARTIAL) {
		for (ic = 0; ic < MB_SQUARE_SIZE; ic++) {
			if (m_ppxlcCurrMBBY [ic] != transpValue)
				iSAD += abs (m_ppxlcCurrMBY [ic] - ((m_ppxlcPredMBY [ic] + m_ppxlcPredMBBackY [ic] + 1) >> 1));
		}
	}
// end of new changes
	return iSAD;
}


Void CVideoObjectEncoder::motionCompInterpAndError (
	const CMotionVector* pmvForward, const CMotionVector* pmvBackward, 
	CoordI x, CoordI y,
	CRct *prctMVLimitForward,CRct *prctMVLimitBackward
)
{
	motionCompEncY (
		m_pvopcRefQ0->pixelsY (), 
		m_puciRefQZoom0->pixels (),
		m_ppxlcPredMBY, MB_SIZE, pmvForward, x, y,
		prctMVLimitForward
	);
	motionCompEncY (
		m_pvopcRefQ1->pixelsY (), 
		m_puciRefQZoom1->pixels (),
		m_ppxlcPredMBBackY, MB_SIZE, pmvBackward, x, y,
		prctMVLimitBackward
	);
	Int ic;
	for (ic = 0; ic < MB_SQUARE_SIZE; ic++) {
		m_ppxlcPredMBY [ic] = (m_ppxlcPredMBY [ic] + m_ppxlcPredMBBackY [ic] + 1) >> 1;
		m_ppxliErrorMBY [ic] = m_ppxlcCurrMBY [ic] - m_ppxlcPredMBY [ic];
	}
}

Void CVideoObjectEncoder::motionCompInterpAndError_WithShape (
	const CMotionVector* pmvForward, const CMotionVector* pmvBackward, 
	CoordI x, CoordI y,
	CRct *prctMVLimitForward,CRct *prctMVLimitBackward
)
{
	motionCompEncY (
		m_pvopcRefQ0->pixelsY (), 
		m_puciRefQZoom0->pixels (),
		m_ppxlcPredMBY, MB_SIZE, pmvForward, x, y,
		prctMVLimitForward
	);
	motionCompEncY (
		m_pvopcRefQ1->pixelsY (), 
		m_puciRefQZoom1->pixels (),
		m_ppxlcPredMBBackY, MB_SIZE, pmvBackward, x, y,
		prctMVLimitBackward
	);
	Int ic;
	for (ic = 0; ic < MB_SQUARE_SIZE; ic++) {
		if (m_ppxlcCurrMBBY [ic] == transpValue){
		m_ppxlcPredMBY [ic] = (m_ppxlcPredMBY [ic] + m_ppxlcPredMBBackY [ic] + 1) >> 1;
		/*m_ppxlcPredMBY [ic] = */m_ppxliErrorMBY [ic] = 0;
		}
		else {
			m_ppxlcPredMBY [ic] = (m_ppxlcPredMBY [ic] + m_ppxlcPredMBBackY [ic] + 1) >> 1;
			m_ppxliErrorMBY [ic] = m_ppxlcCurrMBY [ic] - m_ppxlcPredMBY [ic];
		}
	}
}