SimpleWaveReader.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "Containers/ArrayView.h"
#include "HAL/Platform.h"
#include "Templates/SharedPointer.h"
 
class FArchive;
 
namespace Audio
{
    class FSimpleWaveReader
    {
    public:
        CORE_API FSimpleWaveReader(TUniquePtr<FArchive>&& InOutputStream);
        CORE_API ~FSimpleWaveReader();
 
        CORE_API void SeekToFrame(uint32 FrameIndex) const;
 
        // returns true if the end of the file was reached
        CORE_API bool Read(TArrayView<const float> OutBuffer, int64& OutNumSamplesRead) const;
 
        CORE_API bool IsDataValid() const;
 
        CORE_API uint32 GetSampleRate() const;
 
        CORE_API uint16 GetNumChannels() const;
 
        CORE_API uint32 GetNumSamples() const;
        
    private:
    
        bool ReadHeader(uint32& OutSampleRate, uint16& OutNumChannels, uint32& OutDataSize);
        
        TUniquePtr<FArchive> InputStream;
        int64 DataStartPos = 0;
 
        uint32 SampleRate = 0;
        uint16 NumChannels = 0;
        uint32 DataSize = 0;
        bool bIsDataValid = false;
    };
}