UnrealEngineUWP/Engine/Plugins/Runtime/Metasound/Source/MetasoundStandardNodes/Private/MetasoundLinearToLogFrequencyNode.cpp

// Copyright Epic Games, Inc. All Rights Reserved.

#include "Internationalization/Text.h"
#include "MetasoundFacade.h"
#include "MetasoundExecutableOperator.h"
#include "MetasoundNodeRegistrationMacro.h"
#include "MetasoundPrimitives.h"
#include "MetasoundStandardNodesNames.h"
#include "MetasoundStandardNodesCategories.h"
#include "DSP/Dsp.h"
#include "MetasoundParamHelper.h"

#define LOCTEXT_NAMESPACE "MetasoundStandardNodes_LinearToLogFreqNode"

namespace Metasound
{
	namespace LinearToLogFrequencyVertexNames
	{
		METASOUND_PARAM(InputValue, "Value", "Linear input value to map to log frequency output. Input and output are clamped to specified domain and range.");
		METASOUND_PARAM(InputDomainMin, "Min Domain", "Min domain for the input value.");
		METASOUND_PARAM(InputDomainMax, "Max Domain", "Max domain for the input value.");
		METASOUND_PARAM(InputRangeMin, "Min Range", "Min positive range for the output frequency (hz) value.");
		METASOUND_PARAM(InputRangeMax, "Max Range", "Max poasitive range for the output frequency (hz) value.");
		METASOUND_PARAM(OutputFreq, "Frequency", "Output frequency value in hertz that is the log frequency of the input value.");
	}

	class FLinearToLogFrequencyOperator : public TExecutableOperator<FLinearToLogFrequencyOperator>
	{
	public:

		static const FNodeClassMetadata& GetNodeInfo()
		{
			auto InitNodeInfo = []() -> FNodeClassMetadata
			{
				FName OperatorName = TEXT("Linear To Log Frequency");
				FText NodeDisplayName = LOCTEXT("LinearToLogFrequencyName", "Linear To Log Frequency");
				FText NodeDescription = LOCTEXT("LinearToLogFrequencyDescription", "Converts a linear space input value to log-frequency space.");

				FNodeClassMetadata Info;
				Info.ClassName = { Metasound::StandardNodes::Namespace, OperatorName, TEXT("") };
				Info.MajorVersion = 1;
				Info.MinorVersion = 0;
				Info.DisplayName = NodeDisplayName;
				Info.Description = NodeDescription;
				Info.Author = PluginAuthor;
				Info.PromptIfMissing = PluginNodeMissingPrompt;
				Info.DefaultInterface = GetVertexInterface();
				Info.CategoryHierarchy.Emplace(StandardNodes::Music);

				return Info;
			};

			static const FNodeClassMetadata Info = InitNodeInfo();

			return Info;
		}

		static const FVertexInterface& GetVertexInterface()
		{
			using namespace LinearToLogFrequencyVertexNames;

			static const FVertexInterface Interface(
				FInputVertexInterface(
					TInputDataVertexModel<float>(METASOUND_GET_PARAM_NAME_AND_TT(InputValue),     0.0f),
					TInputDataVertexModel<float>(METASOUND_GET_PARAM_NAME_AND_TT(InputDomainMin), 0.0f),
					TInputDataVertexModel<float>(METASOUND_GET_PARAM_NAME_AND_TT(InputDomainMax), 1.0f),
					TInputDataVertexModel<float>(METASOUND_GET_PARAM_NAME_AND_TT(InputRangeMin),  20.0f),
					TInputDataVertexModel<float>(METASOUND_GET_PARAM_NAME_AND_TT(InputRangeMax),  20000.0f)
					),
				FOutputVertexInterface(
					TOutputDataVertexModel<float>(METASOUND_GET_PARAM_NAME_AND_TT(OutputFreq))
				)
			);

			return Interface;
		}

		static TUniquePtr<IOperator> CreateOperator(const FCreateOperatorParams& InParams, FBuildErrorArray& OutErrors)
		{
			using namespace LinearToLogFrequencyVertexNames;

			const FDataReferenceCollection& InputCollection = InParams.InputDataReferences;
			const FInputVertexInterface& InputInterface = GetVertexInterface().GetInputInterface();

			TDataReadReference<float> InValue = InputCollection.GetDataReadReferenceOrConstructWithVertexDefault<float>(InputInterface, METASOUND_GET_PARAM_NAME(InputValue), InParams.OperatorSettings);
			TDataReadReference<float> InDomainMin = InputCollection.GetDataReadReferenceOrConstructWithVertexDefault<float>(InputInterface, METASOUND_GET_PARAM_NAME(InputDomainMin), InParams.OperatorSettings);
			TDataReadReference<float> InDomainMax = InputCollection.GetDataReadReferenceOrConstructWithVertexDefault<float>(InputInterface, METASOUND_GET_PARAM_NAME(InputDomainMax), InParams.OperatorSettings);
			TDataReadReference<float> InRangeMin = InputCollection.GetDataReadReferenceOrConstructWithVertexDefault<float>(InputInterface, METASOUND_GET_PARAM_NAME(InputRangeMin), InParams.OperatorSettings);
			TDataReadReference<float> InRangeMax = InputCollection.GetDataReadReferenceOrConstructWithVertexDefault<float>(InputInterface, METASOUND_GET_PARAM_NAME(InputRangeMax), InParams.OperatorSettings);

			return MakeUnique<FLinearToLogFrequencyOperator>(InValue, InDomainMin, InDomainMax, InRangeMin, InRangeMax);
		}

		FLinearToLogFrequencyOperator(
			const TDataReadReference<float>& InValue, 
			const TDataReadReference<float>& InDomainMin,
			const TDataReadReference<float>& InDomainMax,
			const TDataReadReference<float>& InRangeMin,
			const TDataReadReference<float>& InRangeMax)
			: Value(InValue)
			, DomainMin(InDomainMin)
			, DomainMax(InDomainMax)
			, RangeMin(InRangeMin)
			, RangeMax(InRangeMax)
			, FreqOutput(FFloatWriteRef::CreateNew(GetOutputValue()))
			, PrevInputValue(*Value)
		{
		}

		virtual FDataReferenceCollection GetInputs() const override
		{
			using namespace LinearToLogFrequencyVertexNames;

			FDataReferenceCollection InputDataReferences;
			InputDataReferences.AddDataReadReference(METASOUND_GET_PARAM_NAME(InputValue), Value);
			InputDataReferences.AddDataReadReference(METASOUND_GET_PARAM_NAME(InputDomainMin), DomainMin);
			InputDataReferences.AddDataReadReference(METASOUND_GET_PARAM_NAME(InputDomainMax), DomainMax);
			InputDataReferences.AddDataReadReference(METASOUND_GET_PARAM_NAME(InputRangeMin), RangeMin);
			InputDataReferences.AddDataReadReference(METASOUND_GET_PARAM_NAME(InputRangeMax), RangeMax);

			return InputDataReferences;

		}

		virtual FDataReferenceCollection GetOutputs() const override
		{
			using namespace LinearToLogFrequencyVertexNames;

			FDataReferenceCollection OutputDataReferences;
			OutputDataReferences.AddDataReadReference(METASOUND_GET_PARAM_NAME(OutputFreq), FreqOutput);
			return OutputDataReferences;
		}

		void Execute()
		{
			using namespace LinearToLogFrequencyVertexNames;

			if (!FMath::IsNearlyEqual(*Value, PrevInputValue))
			{
				PrevInputValue = *Value;
				*FreqOutput = GetOutputValue();
			}
		}

	private:
		float GetOutputValue() const
		{
			float RangeMinClamped = FMath::Max(*RangeMin, SMALL_NUMBER);
			float RangeMaxClamped = FMath::Max(*RangeMax, SMALL_NUMBER);
			float Result = Audio::GetLogFrequencyClamped(*Value, { *DomainMin, *DomainMax }, { RangeMinClamped, RangeMaxClamped });
			return Result;
		}

		TDataReadReference<float> Value;
		TDataReadReference<float> DomainMin;
		TDataReadReference<float> DomainMax;
		TDataReadReference<float> RangeMin;
		TDataReadReference<float> RangeMax;

		FFloatWriteRef FreqOutput;

		float PrevInputValue;
	};


	class METASOUNDSTANDARDNODES_API FLinearToLogFrequencyNode : public FNodeFacade
	{
	public:
		/**
		 * Constructor used by the Metasound Frontend.
		 */
		FLinearToLogFrequencyNode(const FNodeInitData& InitData)
			: FNodeFacade(InitData.InstanceName, InitData.InstanceID, TFacadeOperatorClass<FLinearToLogFrequencyOperator>())
		{

		}
	};

	METASOUND_REGISTER_NODE(FLinearToLogFrequencyNode)
}

#undef LOCTEXT_NAMESPACE