IAudioMixerWasapiDeviceManager.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "AudioMixer.h" 
#include "Misc/ScopeRWLock.h"
#include "WasapiAudioFormat.h"
 
#include "Windows/AllowWindowsPlatformTypes.h"
#include "Windows/AllowWindowsPlatformAtomics.h"
 
#include "Microsoft/COMPointer.h"
 
THIRD_PARTY_INCLUDES_START
#include <mmdeviceapi.h>            // IMMNotificationClient
#include <audiopolicy.h>            // IAudioSessionEvents
THIRD_PARTY_INCLUDES_END
 
#include "Windows/HideWindowsPlatformAtomics.h"
#include "Windows/HideWindowsPlatformTypes.h"
 
DECLARE_DELEGATE(FAudioMixerReadNextBufferDelegate);
 
namespace Audio
{
    struct FWasapiRenderStreamParams
    {
        TComPtr<IMMDevice> MMDevice;
 
        FAudioPlatformDeviceInfo HardwareDeviceInfo;
 
        uint32 NumFrames = 0;
 
        int32 NumBuffers = 0;
 
        uint32 SampleRate = 0;
 
        FWasapiRenderStreamParams() = default;
 
        FWasapiRenderStreamParams(const TComPtr<IMMDevice>& InMMDevice,
            const FAudioPlatformDeviceInfo& InDeviceInfo,
            const uint32 InNumFrames,
            const uint32 InNumBuffers,
            const uint32 InSampleRate) :
            MMDevice(InMMDevice),
            HardwareDeviceInfo(InDeviceInfo),
            NumFrames(InNumFrames),
            NumBuffers(InNumBuffers),
            SampleRate(InSampleRate)
        {
        }
    };
 
    class IAudioMixerWasapiDeviceManager
    {
    public:
 
        IAudioMixerWasapiDeviceManager() = default;
        virtual ~IAudioMixerWasapiDeviceManager() = default;
 
        virtual bool InitializeHardware(const TArray<FWasapiRenderStreamParams>& InParams, const TFunction<void()>& InCallback) = 0;
        virtual bool TeardownHardware() = 0;
        virtual bool IsInitialized() const = 0;
        virtual int32 GetNumDirectOutChannels() const = 0;
        virtual int32 GetNumFrames(const int32 InNumRequestedFrames) const = 0;
        virtual bool OpenAudioStream(const  TArray<FWasapiRenderStreamParams>& InParams) = 0;
        virtual bool CloseAudioStream() = 0;
        virtual bool StartAudioStream() = 0;
        virtual bool StopAudioStream() = 0;
        virtual void SubmitBuffer(const uint8* InBuffer, const SIZE_T InNumFrames) = 0;
        virtual void SubmitDirectOutBuffer(const int32 InDirectOutIndex, const FAlignedFloatBuffer& InBuffer) = 0;
    };
 
    class IDeviceRenderCallback
    {
    public:
        virtual ~IDeviceRenderCallback() = default;
        
        virtual void DeviceRenderCallback() = 0;
    };
 
}