AudioMixerPlatformSDL.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "AudioMixer.h"
 
THIRD_PARTY_INCLUDES_START
#include <SDL3/SDL.h>
#include <SDL3/SDL_audio.h>
THIRD_PARTY_INCLUDES_END
 
namespace Audio
{
 
    class FMixerPlatformSDL : public IAudioMixerPlatformInterface
    {
 
    public:
 
        FMixerPlatformSDL();
        virtual ~FMixerPlatformSDL();
 
        //~ Begin IAudioMixerPlatformInterface Interface
        FString GetPlatformApi() const override { return TEXT("SDL3"); }
        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;
        void SubmitBuffer(const uint8* Buffer) override;
        FString GetDefaultDeviceName() override;
        FAudioPlatformSettings GetPlatformSettings() const override;
        void ResumeContext() override;
        void SuspendContext() override;
        //~ End IAudioMixerPlatformInterface Interface
 
        void HandleOnBufferEnd(uint8* InOutputBuffer, int32 InOutputBufferLength);
 
        SDL_AudioFormat GetPlatformAudioFormat() { return SDL_AUDIO_F32LE; }
        Uint8 GetPlatformChannels() { return 6; }
        EAudioMixerStreamDataFormat::Type GetAudioStreamFormat() { return EAudioMixerStreamDataFormat::Float; }
        int32 GetAudioStreamChannelSize() { return sizeof(float); }
        int32 GetOutputBufferByteLength() { return OutputBufferByteLength; }
        
    protected:
        FCriticalSection OutputBufferMutex;
 
    private:
 
        SDL_AudioDeviceID AudioDeviceID;
        SDL_AudioSpec AudioSpec;
        SDL_AudioStream *AudioStream;
 
        uint8* OutputBuffer;
        int32 OutputBufferByteLength;
 
        bool bSuspended;
        bool bInitialized;
    };
 
}