H:/Class/11756/HLab/HLabLib/HLabViterbi.h

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#pragma once

#ifdef WIN32
        #if defined _USRDLL 
                #define DllExport _declspec(dllexport)
        #else
                #define DllExport _declspec(dllimport)
        #endif 
#endif

#include "HLabHMM.h"
#include "HLabFeat.h"
#include "HLabConst.h"

class DllExport CHLabViterbi
{
        const CHLabHMM*  m_pHMM;
        const CHLabFeat* m_pFeat;
        int m_iDim;
        
        float m_afLikelihood[MAX_NUM_STATES];
        int   m_aiBackpointer[MAX_NUM_STATES];
        
        int m_iT;
        float            m_fOutNonEmitSt_L;
        int              m_iOutNonEmitBackPointer;

        float GaussianPDF(int iTestFrameIndex, int iStateIndex);
public:
        CHLabViterbi(void);
        virtual ~CHLabViterbi(void);

        int Init(CHLabHMM* pHMM, CHLabFeat* pFeat);
        
        float Run(float* pfOutLikelihood, int* piOutBackPointer,
                          float* pfHighestLikelihood,
                     float fInLikelihood,    int iInBackPointer, float fTH = -HLab_INFINITY);

        inline float GetNonEmissionStateProb(void)
        {
                return m_fOutNonEmitSt_L;
        }

        inline int GetNonEmissionStateBackpointer(void)
        {
                return m_iOutNonEmitBackPointer;
        }
        
};

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