sys_encoder_mvenc.cpp

完整的RTP RTSP代码库

/**************************************************************************


This software module was originally developed by 

	Ming-Chieh Lee ([e-mail]), Microsoft Corporation
	Wei-ge Chen ([e-mail]), Microsoft Corporation
	Simon Winder ([e-mail]), Microsoft Corporation
	(date: June, 1997)
and edited by
        Wei Wu ([e-mail]) Rockwell Science Center

and also edited by
	Yoshihiro Kikuchi (TOSHIBA CORPORATION)
	Takeshi Nagai (TOSHIBA CORPORATION)
	Toshiaki Watanabe (TOSHIBA CORPORATION)
	Noboru Yamaguchi (TOSHIBA CORPORATION)

and also edited by
	Yoshinori Suzuki (Hitachi, Ltd.)

and also edited by
    Fujitsu Laboratories Ltd. (contact: Eishi Morimatsu)

in the course of development of the MPEG-4 Video (ISO/IEC 14496-2). 
This software module is an implementation of a part of one or more MPEG-4 Video tools 
as specified by the MPEG-4 Video. 
ISO/IEC gives users of the MPEG-4 Video free license to this software module or modifications 
thereof for use in hardware or software products claiming conformance to the MPEG-4 Video. 
Those intending to use this software module in hardware or software products are advised that its use may infringe existing patents. 
The original developer of this software module and his/her company, 
the subsequent editors and their companies, 
and ISO/IEC have no liability for use of this software module or modifications thereof in an implementation. 
Copyright is not released for non MPEG-4 Video conforming products. 
Microsoft retains full right to use the code for his/her own purpose, 
assign or donate the code to a third party and to inhibit third parties from using the code for non <MPEG standard> conforming products. 
This copyright notice must be included in all copies or derivative works. 

Copyright (c) 1996, 1997.
 
Revision History:
	Dec 11, 1997:	X. Chen and B. Eifrig
	Interlaced tools added by NextLevel Systems

**************************************************************************/
#include <stdio.h>
#include <iostream>
#include <math.h>
#include <stdlib.h>

#include "typeapi.h"
#include "codehead.h"
#include "global.hpp"
#include "bitstrm.hpp"
#include "entropy.hpp"
#include "huffman.hpp"
#include "mode.hpp"
#include "vopses.hpp"
#include "vopseenc.hpp"

#ifdef __MFC_
#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

#define new DEBUG_NEW				   
#endif // __MFC_

UInt CVideoObjectEncoder::encodeMV (const CMotionVector* pmv, const CMBMode* pmbmd,
									Bool bLeftBndry, Bool bRightBndry, Bool bTopBndry, Int iMBX, Int iMBY)
{
	UInt nBits = 0;
	CVector vctDiff;
	CVector vctPred;
	if (pmbmd->m_bhas4MVForward) {
		if (bLeftBndry || bRightBndry || bTopBndry)	{
			for (UInt iBlk = Y_BLOCK1; iBlk <= Y_BLOCK4; iBlk++)	{
				findMVpredGeneric (vctPred, pmv, pmbmd, iBlk, iMBX, iMBY);
				vctDiff = (pmv + iBlk)->trueMVHalfPel () - vctPred;
#ifdef __TRACE_AND_STATS_
				m_pbitstrmOut->trace ((pmv + iBlk)->trueMVHalfPel (), "MB_MV_Curr");
				m_pbitstrmOut->trace (vctPred, "MB_MV_Pred");
				m_pbitstrmOut->trace (vctDiff, "MB_MV_Diff");
#endif // __TRACE_AND_STATS_
				nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
			}
		}
		else {
			for (UInt iBlk = Y_BLOCK1; iBlk <= Y_BLOCK4; iBlk++)	{
				find8x8MVpredInterior (vctPred, pmv, iBlk);
				vctDiff = (pmv + iBlk) -> trueMVHalfPel () - vctPred;
#ifdef __TRACE_AND_STATS_
				m_pbitstrmOut->trace ((pmv + iBlk)->trueMVHalfPel (), "MB_MV_Curr");
				m_pbitstrmOut->trace (vctPred, "MB_MV_Pred");
				m_pbitstrmOut->trace (vctDiff, "MB_MV_Diff");
#endif // __TRACE_AND_STATS_
				nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
			}
		}
	} else if (pmbmd->m_bFieldMV) {
			find16x16MVpred(vctPred, pmv, bLeftBndry, bRightBndry, bTopBndry);
			if(pmbmd->m_bForwardTop) {
				vctDiff.x = pmv[6].m_vctTrueHalfPel.x   - vctPred.x;
				vctDiff.y = pmv[6].m_vctTrueHalfPel.y/2 - vctPred.y/2;
			} 
			else
			{
				vctDiff.x = pmv[5].m_vctTrueHalfPel.x   - vctPred.x;
				vctDiff.y = pmv[5].m_vctTrueHalfPel.y/2 - vctPred.y/2;
			}
			nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
			if(pmbmd->m_bForwardBottom) {
				vctDiff.x = pmv[8].m_vctTrueHalfPel.x   - vctPred.x;
				vctDiff.y = pmv[8].m_vctTrueHalfPel.y/2 - vctPred.y/2;
			}
			else
			{
				vctDiff.x = pmv[7].m_vctTrueHalfPel.x   - vctPred.x;
				vctDiff.y = pmv[7].m_vctTrueHalfPel.y/2 - vctPred.y/2;
			}
			nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
	} else {		//1mv
		findMVpredGeneric (vctPred, pmv, pmbmd, ALL_Y_BLOCKS, iMBX, iMBY);
		vctDiff = pmv->trueMVHalfPel () - vctPred;
#ifdef __TRACE_AND_STATS_
		m_pbitstrmOut->trace (pmv->trueMVHalfPel (), "MB_MV_Curr");
		m_pbitstrmOut->trace (vctPred, "MB_MV_Pred");
		m_pbitstrmOut->trace (vctDiff, "MB_MV_Diff");
#endif // __TRACE_AND_STATS_
		nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
	}
	return nBits;
}


UInt CVideoObjectEncoder::encodeMVWithShape (const CMotionVector* pmv, const CMBMode* pmbmd, Int iXMB, Int iYMB)
{
	UInt nBits = 0;
	CVector vctDiff;
	CVector vctPred;

	if (pmbmd->m_bhas4MVForward)	{	//4mv
		for (UInt iBlk = Y_BLOCK1; iBlk <= Y_BLOCK4; iBlk++)	{
			if (pmbmd->m_rgTranspStatus[iBlk] != ALL)	{
				findMVpredGeneric (vctPred, pmv, pmbmd, iBlk, iXMB, iYMB);
				vctDiff = (pmv + iBlk)->trueMVHalfPel () - vctPred;
				nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
			}
		}
	}
// INTERLACED
		// new changes
	else if (pmbmd->m_bFieldMV) {
			findMVpredGeneric (vctPred, pmv, pmbmd, ALL_Y_BLOCKS, iXMB, iYMB);
			if(pmbmd->m_bForwardTop) {
				vctDiff.x = pmv[6].m_vctTrueHalfPel.x   - vctPred.x;
				vctDiff.y = pmv[6].m_vctTrueHalfPel.y/2 - vctPred.y/2;
			} 
			else
			{
				vctDiff.x = pmv[5].m_vctTrueHalfPel.x   - vctPred.x;
				vctDiff.y = pmv[5].m_vctTrueHalfPel.y/2 - vctPred.y/2;
			}
			nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
			if(pmbmd->m_bForwardBottom) {
				vctDiff.x = pmv[8].m_vctTrueHalfPel.x   - vctPred.x;
				vctDiff.y = pmv[8].m_vctTrueHalfPel.y/2 - vctPred.y/2;
			}
			else
			{
				vctDiff.x = pmv[7].m_vctTrueHalfPel.x   - vctPred.x;
				vctDiff.y = pmv[7].m_vctTrueHalfPel.y/2 - vctPred.y/2;
			}
			nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
	}
			// end of new changes
// INTERLACED
	else {		//1mv
		findMVpredGeneric (vctPred, pmv, pmbmd, ALL_Y_BLOCKS, iXMB, iYMB);
		vctDiff = pmv->trueMVHalfPel () - vctPred;
		nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
	}
	return nBits;
}

Void CVideoObjectEncoder::scaleMV (Int& iVLC, UInt& uiResidual, Int iDiffMVcomponent, const MVInfo *pmviDir)
{
	if (iDiffMVcomponent < (-1 * (Int) pmviDir->uiRange))
		iDiffMVcomponent += 2 * pmviDir->uiRange;
	else if (iDiffMVcomponent > (Int) (pmviDir->uiRange - 1))
		iDiffMVcomponent -= 2 * pmviDir->uiRange;

	if (iDiffMVcomponent == 0)	{									//nothing to do
		iVLC = 0;
		uiResidual = 0;
	}
	else	{
		if (pmviDir->uiScaleFactor == 1)	{									//simple no-scale case
			iVLC = iDiffMVcomponent;
			uiResidual = 0;
		}
		else {														//stupid scaling
			UInt uiAbsDiffMVcomponent = abs (iDiffMVcomponent);
			uiResidual = (uiAbsDiffMVcomponent - 1) % pmviDir->uiScaleFactor;																	
			UInt uiVLCmagnitude = (uiAbsDiffMVcomponent 
								- uiResidual + (pmviDir->uiScaleFactor - 1)) 
								/ pmviDir->uiScaleFactor;	// absorb ++ into here (m_volmd.mvInfo.uiScaleFactor - 1)
			iVLC = uiVLCmagnitude * sign (iDiffMVcomponent);
		}
	}
}

UInt CVideoObjectEncoder::sendDiffMV (const CVector& vctDiffMVHalfPel, const MVInfo *pmviDir)
{
	Int iVLC;
	UInt uiResidual;
	UInt nBits = 0;

	// send the bits
	scaleMV (iVLC, uiResidual, vctDiffMVHalfPel.x, pmviDir);

	Long lsymbol = iVLC + 32;
	nBits += m_pentrencSet -> m_pentrencMV->encodeSymbol (lsymbol, "MB_MV_Magnitude");
	if (iVLC != 0) {
		m_pbitstrmOut->putBits ((Char) uiResidual, pmviDir->uiFCode - 1, "MB_MV_Residual");
		nBits += pmviDir->uiFCode - 1;
	}
	else
		assert (uiResidual == 0);

	scaleMV (iVLC, uiResidual, vctDiffMVHalfPel.y, pmviDir);
	lsymbol = iVLC + 32;
	nBits += m_pentrencSet -> m_pentrencMV->encodeSymbol (lsymbol, "MB_MV_Magnitude");
	if (iVLC != 0) {
		m_pbitstrmOut->putBits ((Char) uiResidual, pmviDir->uiFCode - 1, "MB_MV_Residual");
		nBits += pmviDir->uiFCode - 1;
	}
	else
		assert (uiResidual == 0);
	return nBits;
}


UInt CVideoObjectEncoder::encodeMVofBVOP (
	  const CMotionVector* pmvForward, 
	  const CMotionVector* pmvBackward, 
	  const CMBMode*	   pmbmd, 
	  Int	iMBX,	Int iMBY,
	  const CMotionVector* pmvRef, // not used
	  const CMBMode*	   pmbmdRef // not used
)  // encode motion vectors for b-vop
{
	assert (pmbmd->m_rgTranspStatus [0] != ALL);
	assert (pmbmd->m_dctMd == INTER || pmbmd->m_dctMd == INTERQ);
	assert (pmbmd->m_bSkip == FALSE);

	CVector vctDiff;
	UInt nBits = 0;
	const CVector *pvctMV;
	if (pmbmd->m_mbType == FORWARD || pmbmd->m_mbType == INTERPOLATE)	{
		assert (pmbmd->m_bhas4MVForward != TRUE);
		// TPS FIX
		if (pmbmd->m_bFieldMV && m_volmd.volType != ENHN_LAYER) {
			pvctMV = &pmvForward[1 + (Int)pmbmd->m_bForwardTop].m_vctTrueHalfPel;
			assert((pvctMV->y & 1) == 0);
			vctDiff.x = pvctMV->x   - m_vctForwardMvPredBVOP[0].x;
			vctDiff.y = pvctMV->y/2 - m_vctForwardMvPredBVOP[0].y/2;
#ifdef __TRACE_AND_STATS_
			m_pbitstrmOut->trace (*pvctMV,					"MB_F_MV_Curr_Top");
			m_pbitstrmOut->trace (m_vctForwardMvPredBVOP[0],"MB_F_MV_Pred_Top");
			m_pbitstrmOut->trace (vctDiff,					"MB_F_MV_Diff_Top");
#endif // __TRACE_AND_STATS_
			m_vctForwardMvPredBVOP[0] = *pvctMV;
			nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);

			pvctMV = &pmvForward[3 + (Int)pmbmd->m_bForwardBottom].m_vctTrueHalfPel;
			assert((pvctMV->y & 1) == 0);
			vctDiff.x = pvctMV->x   - m_vctForwardMvPredBVOP[1].x;
			vctDiff.y = pvctMV->y/2 - m_vctForwardMvPredBVOP[1].y/2;
#ifdef __TRACE_AND_STATS_
			m_pbitstrmOut->trace (*pvctMV,					"MB_F_MV_Curr_Bot");
			m_pbitstrmOut->trace (m_vctForwardMvPredBVOP[1],"MB_F_MV_Pred_Bot");
			m_pbitstrmOut->trace (vctDiff,					"MB_F_MV_Diff_Bot");
#endif // __TRACE_AND_STATS_
			m_vctForwardMvPredBVOP[1] = *pvctMV;
			nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
		} else {
			vctDiff = pmvForward[0].m_vctTrueHalfPel - m_vctForwardMvPredBVOP[0];
#ifdef __TRACE_AND_STATS_
			m_pbitstrmOut->trace (pmvForward[0].m_vctTrueHalfPel, "MB_F_MV_Curr");
			m_pbitstrmOut->trace (m_vctForwardMvPredBVOP[0],	  "MB_F_MV_Pred");
			m_pbitstrmOut->trace (vctDiff,						  "MB_F_MV_Diff");
#endif // __TRACE_AND_STATS_
			m_vctForwardMvPredBVOP[0] = pmvForward[0].m_vctTrueHalfPel;
			m_vctForwardMvPredBVOP[1] = pmvForward[0].m_vctTrueHalfPel;
			nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoForward);
		}
	}
	
	// TPS FIX
	if ((pmbmd->m_mbType == BACKWARD || pmbmd->m_mbType == INTERPOLATE) 
		&& (m_volmd.volType != ENHN_LAYER || m_vopmd.iRefSelectCode != 0))	{	// modified by Sharp (98/3/11)
		assert (pmbmd->m_bhas4MVBackward != TRUE);
		// TPS FIX
		if (pmbmd->m_bFieldMV && m_volmd.volType != ENHN_LAYER) {
			pvctMV = &pmvBackward[1 + (Int)pmbmd->m_bBackwardTop].m_vctTrueHalfPel;
			assert((pvctMV->y & 1) == 0);
			vctDiff.x = pvctMV->x   - m_vctBackwardMvPredBVOP[0].x;
			vctDiff.y = pvctMV->y/2 - m_vctBackwardMvPredBVOP[0].y/2;
#ifdef __TRACE_AND_STATS_
			m_pbitstrmOut->trace (*pvctMV,					  "MB_B_MV_Curr_Top");
			m_pbitstrmOut->trace (m_vctBackwardMvPredBVOP[0], "MB_B_MV_Pred_Top");
			m_pbitstrmOut->trace (vctDiff,					  "MB_B_MV_Diff_Top");
#endif // __TRACE_AND_STATS_
			m_vctBackwardMvPredBVOP[0] = *pvctMV;
			nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoBackward);

			pvctMV = &pmvBackward[3 + (Int)pmbmd->m_bBackwardBottom].m_vctTrueHalfPel;
			assert((pvctMV->y & 1) == 0);
			vctDiff.x = pvctMV->x   - m_vctBackwardMvPredBVOP[1].x;
			vctDiff.y = pvctMV->y/2 - m_vctBackwardMvPredBVOP[1].y/2;
#ifdef __TRACE_AND_STATS_
			m_pbitstrmOut->trace (*pvctMV,					  "MB_B_MV_Curr_Bot");
			m_pbitstrmOut->trace (m_vctBackwardMvPredBVOP[1], "MB_B_MV_Pred_Bot");
			m_pbitstrmOut->trace (vctDiff,					  "MB_B_MV_Diff_Bot");
#endif // __TRACE_AND_STATS_
			m_vctBackwardMvPredBVOP[1] = *pvctMV;
			nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoBackward);
		} else {
			vctDiff = pmvBackward[0].m_vctTrueHalfPel - m_vctBackwardMvPredBVOP[0];
#ifdef __TRACE_AND_STATS_
			m_pbitstrmOut->trace (pmvBackward[0].m_vctTrueHalfPel, "MB_B_MV_Curr");
			m_pbitstrmOut->trace (m_vctBackwardMvPredBVOP[0],	   "MB_B_MV_Pred");
			m_pbitstrmOut->trace (vctDiff,						   "MB_B_MV_Diff");
#endif // __TRACE_AND_STATS_
			m_vctBackwardMvPredBVOP[0] = pmvBackward[0].m_vctTrueHalfPel;
			m_vctBackwardMvPredBVOP[1] = pmvBackward[0].m_vctTrueHalfPel;
			nBits += sendDiffMV (vctDiff, &m_vopmd.mvInfoBackward);
		}
	}

	if (pmbmd->m_mbType == DIRECT) {
		static MVInfo mviDirect = { 32, 1, 1 };

		assert (pmbmd->m_bhas4MVForward != TRUE);
#ifdef __TRACE_AND_STATS_
		m_pbitstrmOut->trace (pmbmd->m_vctDirectDeltaMV, "MB_D_MV_Diff");
#endif // __TRACE_AND_STATS_
		nBits += sendDiffMV (pmbmd->m_vctDirectDeltaMV, &mviDirect);
	}
	return nBits;
}