MediaAudioResampler.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Containers/Array.h"
#include "CoreTypes.h"
#include "Delegates/Delegate.h"
#include "IMediaTimeSource.h"
#include "MediaSampleSource.h"
#include "Misc/Timespan.h"
#include "Templates/SharedPointer.h"
 
class IMediaAudioSample;
 
 
class FMediaAudioResampler
{
public:
 
    MEDIAUTILS_API FMediaAudioResampler();
 
public:
 
    MEDIAUTILS_API void Flush();
 
    MEDIAUTILS_API uint32 Generate(float* Output, FMediaTimeStamp& OutTime, const uint32 FramesRequested, float Rate, FTimespan Time, FMediaAudioSampleSource& SampleSource, uint32& JumpFrame);
 
    MEDIAUTILS_API void Initialize(const uint32 InOutputChannels, const uint32 InOutputSampleRate);
 
protected:
 
    MEDIAUTILS_API void ClearInput();
 
    MEDIAUTILS_API bool SetInput(const TSharedPtr<IMediaAudioSample, ESPMode::ThreadSafe>& Sample);
 
private:
 
    //~ Frame interpolation values
 
    float CurrentFrame[8];
 
    float NextFrame[8];
 
    float FrameAlpha;
 
    int64 FrameIndex;
 
    int64 LastFrameIndex;
 
    float LastRate;
 
private:
 
    //~ Input and output specs
 
    TArray<float> Input;
 
    FTimespan InputDuration;
 
    uint32 InputFrames;
 
    uint32 InputSampleRate;
 
    FMediaTimeStamp InputTime;
 
    uint32 OutputChannels;
 
    uint32 OutputSampleRate;
};