M4Prediction.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "vdecmpeg4.h"
#include "M4Global.h"
 
namespace vdecmpeg4
{
 
#define M4ABS(X)        (((X)>0)?(X):-(X))
#define M4DIVDIV(A,B)   ( (A) > 0 ? ((A)+((B)>>1))/(B) : ((A)-((B)>>1))/(B) )
 
struct M4_MB;
 
void M4PredictionInit(M4_MB* macroblocks, int32 mbx, int32 mby, int32 pMBWidth, uint32 block, uint8 currentQuant, uint16 iDcScaler, int16* output);
void M4PredictionAdd(M4_MB* mb, int16* dctBlock, uint32 block, uint16 iDcScaler, const int16* pPrediction);
 
inline int32 rescale(int32 predictQuant, int32 currentQuant, int32 coeff)
{
    return coeff != 0 ? M4DIVDIV((coeff) * (predictQuant), (currentQuant)) : 0;
}
 
}