AudioMixerPlatformAudioLink.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "AudioMixer.h"
#include "IAudioLinkFactory.h"
 
namespace Audio
{
    class FAudioMixerPlatformAudioLink : public IAudioMixerPlatformInterface
    {
    public:
 
        FAudioMixerPlatformAudioLink();
        virtual ~FAudioMixerPlatformAudioLink() = default;
    protected:
 
        //~ Begin IAudioMixerPlatformInterface Interface
        FString GetPlatformApi() const override { return TEXT("AudioLink"); }
        bool InitializeHardware() override;
        bool TeardownHardware() override;
        bool IsInitialized() const override;
        bool GetNumOutputDevices(uint32& OutNumOutputDevices) override;
        bool GetOutputDeviceInfo(const uint32 InDeviceIndex, FAudioPlatformDeviceInfo& OutInfo) override;
        bool GetDefaultOutputDeviceIndex(uint32& OutDefaultDeviceIndex) const override;
        virtual bool OpenAudioStream(const FAudioMixerOpenStreamParams& Params) override;
        bool CloseAudioStream() override;
        bool StartAudioStream() override;
        bool StopAudioStream() override;
        FAudioPlatformDeviceInfo GetPlatformDeviceInfo() const override;
        FString GetDefaultDeviceName() override;
        FAudioPlatformSettings GetPlatformSettings() const override;
        //~ End IAudioMixerPlatformInterface Interface
 
    private:
        void MakeDeviceInfo(int32 InNumChannels, int32 InSampleRate, const FString& InName);
 
        void OnLinkOpenStream(const IAudioLinkSynchronizer::FOnOpenStreamParams&);
        void OnLinkRenderBegin(const IAudioLinkSynchronizer::FOnRenderParams&);
        void OnLinkRenderEnd(const IAudioLinkSynchronizer::FOnRenderParams&);
 
        IAudioLinkSynchronizer* GetOrCreateSynchronizer() const;
 
        bool bSuspended = false;
        bool bInitialized = false;
        
        // Atomic flag that's set by unreal, but read in callback from other host engines.
        std::atomic<bool> bAtomicStreamRunning;
        
        IAudioLinkFactory* Factory = nullptr;
        mutable IAudioLinkFactory::FAudioLinkSynchronizerSharedPtr SynchronizeLink;
        FAudioPlatformDeviceInfo DeviceInfo;
        uint32 LastBufferTickID = 0;
        int32 FrameRemainder = 0;
 
        FDelegateHandle OpenStreamHandle;
        FDelegateHandle RenderBeginHandle;
        FDelegateHandle RenderEndHandle;
    };
 
}