DDAImpl.h

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#pragma once
#include <iostream>
#include <vector>
#include <fstream>
using namespace std;
#include <dxgi1_2.h>
#include <d3d11_2.h>

class DDAImpl
{
    ///  Thin wrapper around IDXGIOutputDuplication interface
    /// Manages IDXGIOutputDuplication object lifecycle
    /// Interacts with IDXGIOuputDuplication to acquire new frames

private:
    /// The DDA object
    IDXGIOutputDuplication* pDup = nullptr;
    /// The D3D11 device used by the DDA session
    ID3D11Device* pD3DDev = nullptr;
    /// The D3D11 Device Context used by the DDA session
    ID3D11DeviceContext* pCtx = nullptr;
    /// The resource used to acquire a new captured frame from DDA
    IDXGIResource *pResource = nullptr;
    /// Output width obtained from DXGI_OUTDUPL_DESC
    DWORD width = 0;
    /// Output height obtained from DXGI_OUTDUPL_DESC
    DWORD height = 0;
    /// Running count of no. of accumulated desktop updates
    int frameno = 0;
    /// output file stream to dump timestamps
    ofstream ofs;
    /// DXGI_OUTDUPL_FRAME_INFO::latPresentTime from the last Acquired frame
    LARGE_INTEGER lastPTS = { 0 };
    /// Clock frequency from QueryPerformaceFrequency()
    LARGE_INTEGER qpcFreq = { 0 };
    /// Default constructor
    DDAImpl() {}
    
public:
    /// Initialize DDA
    HRESULT Init();
    /// Acquire a new frame from DDA, and return it as a Texture2D object.
    /// 'wait' specifies the time in milliseconds that DDA shoulo wait for a new screen update.
    HRESULT GetCapturedFrame(ID3D11Texture2D **pTex2D, int wait);
    /// Release all resources
    int Cleanup();
    /// Return output height to caller
    inline DWORD getWidth() { return width; }
    /// Return output width to caller
    inline DWORD getHeight() { return height; }

public:
    /// Constructor
    DDAImpl(ID3D11Device *pDev, ID3D11DeviceContext* pDevCtx)
        :   pD3DDev(pDev)
        ,   pCtx(pDevCtx)
    {
        pD3DDev->AddRef();
        pCtx->AddRef();
        ofs = ofstream("PresentTSLog.txt");
        QueryPerformanceFrequency(&qpcFreq);
    }
    /// Destructor. Release all resources before destroying the object
    ~DDAImpl() { Cleanup(); }
};