AudioCaptureAudioUnit.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "AudioCaptureCore.h"
#include <AudioToolbox/AudioToolbox.h>
#include <AudioUnit/AudioUnit.h>
 
namespace Audio
{
    class FAudioCaptureAudioUnitStream : public IAudioCaptureStream
    {
    public:
        FAudioCaptureAudioUnitStream();
 
        virtual bool GetCaptureDeviceInfo(FCaptureDeviceInfo& OutInfo, int32 DeviceIndex) override;
        virtual bool OpenAudioCaptureStream(const FAudioCaptureDeviceParams& InParams, FOnAudioCaptureFunction InOnCapture, uint32 NumFramesDesired) override;
        virtual bool CloseStream() override;
        virtual bool StartStream() override;
        virtual bool StopStream() override;
        virtual bool AbortStream() override;
        virtual bool GetStreamTime(double& OutStreamTime) override;
        virtual int32 GetSampleRate() const override { return SampleRate; }
        virtual bool IsStreamOpen() const override;
        virtual bool IsCapturing() const override;
        virtual void OnAudioCapture(void* InBuffer, uint32 InBufferFrames, double StreamTime, bool bOverflow) override;
        virtual bool GetInputDevicesAvailable(TArray<FCaptureDeviceInfo>& OutDevices) override;
        virtual void SetHardwareFeatureEnabled(EHardwareInputFeature FeatureType, bool bEnabled);
 
        OSStatus OnCaptureCallback( AudioUnitRenderActionFlags* ioActionFlags, const AudioTimeStamp* inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList* ioData );
 
    private:
        void AllocateBuffer(int SizeInBytes);
        
        AudioComponentInstance IOUnit;
        
        FOnAudioCaptureFunction OnCapture;
        int32 NumChannels;
        int32 SampleRate;
        TArray<uint8> CaptureBuffer;
        int BufferSize = 0;
        bool bIsStreamOpen;
        bool bHasCaptureStarted;
        bool bIsHardwareVoiceProcessingSupported;
    };
}