FileDecoder.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "DSP/Dsp.h"
#include "SampleBuffer.h"
#include "AudioDecompress.h"
#include "GenericPlatform/GenericPlatformFile.h"
#include "Interfaces/IAudioFormat.h"
 
class FAudioFileReader
{
public:
    // Constructor. Takes a file path and immediately loads info.
    // Optionally, CallbackSize can be used to indicate the size of chunks
    // that will be popped off of this instance.
    // When set to 0, the entire file is decompressed into memory.
    AUDIOMIXER_API FAudioFileReader(const FString& InPath);
 
    // Returns file information.
    AUDIOMIXER_API void GetFileInfo(FSoundQualityInfo& OutInfo);
 
    AUDIOMIXER_API bool PopAudio(float* OutAudio, int32 NumSamples);
 
private:
    FAudioFileReader();
 
    // Handle back to the file this was constructed with.
    TUniquePtr<IFileHandle> FileHandle;
 
    // Actual decompressor in question.
    TUniquePtr<ICompressedAudioInfo> Decompressor;
    
    TArray<uint8> CompressedFile;
    TArray<Audio::DefaultUSoundWaveSampleType> DecompressionBuffer;
 
    FSoundQualityInfo QualityInfo;
 
    ICompressedAudioInfo* GetNewDecompressorForFile(const FString& InPath);
 
};