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videoio(MSMF): avoid OpenCV load failure on Win7 machines

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OpenCV binaries are compiled on Win10 environment
This commit is contained in:
Alexander Alekhin 2018-06-29 22:54:58 +03:00
parent 9be3f7d41a
commit 7a2448672c
1 changed files with 20 additions and 1 deletions
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21
modules/videoio/src/cap_msmf.cpp
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@ -83,6 +83,21 @@
#pragma comment(lib, "Mfreadwrite")
#ifdef HAVE_DXVA
#pragma comment(lib, "d3d11")
// MFCreateDXGIDeviceManager() is available since Win8 only.
// To avoid OpenCV loading failure on Win7 use dynamic detection of this symbol.
// Details: https://github.com/opencv/opencv/issues/11858
typedef HRESULT (*FN_MFCreateDXGIDeviceManager)(UINT *resetToken, IMFDXGIDeviceManager **ppDeviceManager);
static bool pMFCreateDXGIDeviceManager_initialized = false;
static FN_MFCreateDXGIDeviceManager pMFCreateDXGIDeviceManager = NULL;
static void init_MFCreateDXGIDeviceManager()
{
HMODULE h = LoadLibraryA("mfplat.dll");
if (h)
{
pMFCreateDXGIDeviceManager = (FN_MFCreateDXGIDeviceManager)GetProcAddress(h, "MFCreateDXGIDeviceManager");
}
pMFCreateDXGIDeviceManager_initialized = true;
}
#endif
#if (WINVER >= 0x0602) // Available since Win 8
#pragma comment(lib, "MinCore_Downlevel")
@ -768,6 +783,10 @@ bool CvCapture_MSMF::configureHW(bool enable)
#ifdef HAVE_DXVA
if ((enable && D3DMgr && D3DDev) || (!enable && !D3DMgr && !D3DDev))
return true;
if (!pMFCreateDXGIDeviceManager_initialized)
init_MFCreateDXGIDeviceManager();
if (enable && !pMFCreateDXGIDeviceManager)
return false;
bool reopen = isOpen;
int prevcam = camid;
@ -788,7 +807,7 @@ bool CvCapture_MSMF::configureHW(bool enable)
{
D3DDevMT->SetMultithreadProtected(TRUE);
D3DDevMT.Release();
if (SUCCEEDED(MFCreateDXGIDeviceManager(&mgrRToken, &D3DMgr)))
if (SUCCEEDED(pMFCreateDXGIDeviceManager(&mgrRToken, &D3DMgr)))
{
if (SUCCEEDED(D3DMgr->ResetDevice(D3DDev.Get(), mgrRToken)))
{