VideoDecoderUtilities.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "HAL/Event.h"
#include "HAL/PlatformProcess.h"
 
 
namespace AVEncoder
{
 
namespace DecoderUtilities
{
 
class FEventSignal
{
public:
    FEventSignal(): Event(FPlatformProcess::GetSynchEventFromPool(true))
    {   }
 
    // Not copyable!
    FEventSignal(const FEventSignal&) = delete;
    FEventSignal& operator=(const FEventSignal&) = delete;
 
    ~FEventSignal()
    {
        Event->Trigger();
        FPlatformProcess::ReturnSynchEventToPool(Event);
    }
 
    void Wait()
    {
        Event->Wait();
    }
 
    void WaitAndReset()
    {
        Event->Wait();
        Event->Reset();
    }
 
    void Signal()
    {
        Event->Trigger();
    }
 
    void Reset()
    {
        Event->Reset();
    }
 
    bool IsSignaled() const
    {
        return Event->Wait(0);
    }
 
    bool WaitTimeout(int64 InMicroSeconds)
    {
        return Event->Wait(FTimespan::FromMicroseconds((double)InMicroSeconds));
    }
 
    bool WaitTimeoutAndReset(int64 InMicroSeconds)
    {
        check(InMicroSeconds > 0);  // 0 is forbidden. either call Wait() without timeout, or check the signal using IsSignaled()
        if (Event->Wait(FTimespan::FromMicroseconds((double)InMicroSeconds)))
        {
            Event->Reset();
            return true;
        }
        return false;
    }
 
private:
    mutable FEvent* Event;
};
 
 
} /* namespace DecoderUtilities */
 
 
} /* namespace AVEncoder */