102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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namespace Audio
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{
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// Wavetable oscillator types
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namespace EWaveTable
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{
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enum Type
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{
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None,
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SineWaveTable,
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SawWaveTable,
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TriangleWaveTable,
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SquareWaveTable,
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BandLimitedSawWaveTable,
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BandLimitedTriangleWaveTable,
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BandLimitedSquareWaveTable,
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Custom
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};
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}
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class FWaveTableOsc;
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// A wave table oscillator class
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class FWaveTableOsc
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{
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public:
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// Constructor
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SIGNALPROCESSING_API FWaveTableOsc();
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// Virtual Destructor
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SIGNALPROCESSING_API virtual ~FWaveTableOsc();
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// Initialize the wave table oscillator
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SIGNALPROCESSING_API void Init(const float InSampleRate, const float InFrequencyHz);
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// Sets the sample rate of the oscillator.
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SIGNALPROCESSING_API void SetSampleRate(const float InSampleRate);
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// Resets the wave table read indices.
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SIGNALPROCESSING_API void Reset();
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// Sets the amount to scale and add to the output of the wave table
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SIGNALPROCESSING_API void SetScaleAdd(const float InScale, const float InAdd);
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// Returns the type of the wave table oscillator.
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EWaveTable::Type GetType() const { return WaveTableType; }
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// Sets the frequency of the wave table oscillator.
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SIGNALPROCESSING_API void SetFrequencyHz(const float InFrequencyHz);
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// Returns the frequency of the wave table oscillator.
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float GetFrequencyHz() const { return FrequencyHz; }
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// Returns the internal table used in the wave table.
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SIGNALPROCESSING_API TArray<float>& GetTable();
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SIGNALPROCESSING_API const TArray<float>& GetTable() const;
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// Processes the wave table, outputs the normal and quad phase (optional) values
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SIGNALPROCESSING_API void Generate(float* OutputNormalPhase, float* OutputQuadPhase = nullptr);
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// Creates a wave table using internal factories for standard wave tables or uses custom wave table factor if it exists.
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static SIGNALPROCESSING_API TSharedPtr<FWaveTableOsc> CreateWaveTable(const EWaveTable::Type WaveTableType, const int32 WaveTableSize = 1024);
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protected:
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SIGNALPROCESSING_API void UpdateFrequency();
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// The wave table buffer
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TArray<float> WaveTableBuffer;
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// The frequency of the output (given the sample rate)
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float FrequencyHz;
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// The sample rate of the oscillator
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float SampleRate;
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// Normal phase read index
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float NormalPhaseReadIndex;
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// The quad-phase read index
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float QuadPhaseReadIndex;
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// The phase increment (based on frequency)
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float PhaseIncrement;
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// Amount to scale the output by
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float OutputScale;
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// Amount to add to the output
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float OutputAdd;
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// The wave table oscillator type
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EWaveTable::Type WaveTableType;
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};
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}
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