Viterbi.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
#include "CoreMinimal.h"
 
namespace Audio
{
    class IViterbiObservations
    {
        public:
            virtual ~IViterbiObservations() {}
            
            virtual int32 GetNumStates() const = 0;
 
            virtual int32 GetNumTimeSteps() const = 0;
 
            virtual float GetEmissionLogProbability(int32 InTimeStep, int32 InState) const = 0;
    };
 
    class IViterbiInitialProbability
    {
        public:
            virtual ~IViterbiInitialProbability() {}
 
            virtual float GetInitialLogProbability(int32 InState) const = 0;
    };
 
    class IViterbiTransitionProbability
    {
        public:
            virtual ~IViterbiTransitionProbability() {}
 
            virtual float GetTransitionLogProbability(int32 InTimeStep, int32 InPreviousState, int32 InCurrentState) const = 0;
    };
 
    struct FViterbi
    {
        SIGNALPROCESSING_API static TArray<int32> Decode(const IViterbiObservations& InObservations, const IViterbiInitialProbability& InInitialProbability, const IViterbiTransitionProbability& InTransitionProbability);
    };
}