小编wsh*_*rey的帖子

我正在尝试使用BlackMagic SDK编写预览应用程序,但播放速度不稳定.我正在使用MFC框架,并将CWnd子类化为我的视频预览窗口.

当每帧视频到达时,我会进行RGB颜色转换,然后调用一个函数来显示RGB位图.

void VideoPreview::Display(int width, int height, byte* buffer)
{
    __int64 begin = GetTickCount();
    HRESULT     hr;
    CRect       rcRect, statusBarRect;

    GetClientRect (rcRect);

    BITMAPINFO bmInfo;
    ZeroMemory(&bmInfo, sizeof(BITMAPINFO));
    bmInfo.bmiHeader.biSize       = sizeof(BITMAPINFOHEADER);
    bmInfo.bmiHeader.biBitCount   = 32;
    bmInfo.bmiHeader.biPlanes     = 1;
    bmInfo.bmiHeader.biWidth      = width;
    bmInfo.bmiHeader.biHeight     = -height;

    dc->SetStretchBltMode(COLORONCOLOR);

    int iResult = StretchDIBits(*dc,
        rcRect.left, rcRect.top, rcRect.right, rcRect.bottom,
        0, 0, width, height,
        buffer, &bmInfo, 0, SRCCOPY);
    DWORD dwError;
    if (iResult == 0 || iResult == GDI_ERROR)
    {
        dwError = GetLastError();
    }
    else
        fpsCount++;
    procTimeCount += GetTickCount() - begin; …