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DLLMain.cpp
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DLLMain.cpp
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#include <initguid.h>
#include "Common.h"
#include "Activate.h"
#include "ClassFactory.h"
#include "MediaSink.h"
HMODULE g_hModule = NULL;
volatile long DX11VideoRenderer::CBase::s_lObjectCount = 0;
volatile long DX11VideoRenderer::CClassFactory::s_lLockCount = 0;
// helper functions
///////////////////////////////////////////////////////////////////////
// Name: CreateObjectKeyName
// Desc: Converts a CLSID into a string with the form "CLSID\{clsid}"
///////////////////////////////////////////////////////////////////////
HRESULT CreateObjectKeyName(const GUID& guid, _Out_writes_(cchMax) TCHAR* pszName, DWORD cchMax)
{
pszName[0] = _T('\0');
// convert CLSID to string
OLECHAR pszCLSID[CHARS_IN_GUID];
HRESULT hr = StringFromGUID2(guid, pszCLSID, CHARS_IN_GUID);
if (SUCCEEDED(hr))
{
// create a string of the form "CLSID\{clsid}"
hr = StringCchPrintf(pszName, cchMax - 1, TEXT("CLSID\\%ls"), pszCLSID);
}
return hr;
}
///////////////////////////////////////////////////////////////////////
// Name: SetKeyValue
// Desc: Sets a string value (REG_SZ) for a registry key
//
// hKey: Handle to the registry key.
// sName: Name of the value. Use NULL for the default value.
// sValue: The string value.
///////////////////////////////////////////////////////////////////////
HRESULT SetKeyValue(HKEY hKey, const TCHAR* pszName, const TCHAR* pszValue)
{
size_t cch = 0;
DWORD cbData = 0;
HRESULT hr = StringCchLength(pszValue, MAXLONG, &cch);
if (SUCCEEDED(hr))
{
cbData = (DWORD) (sizeof(TCHAR) * (cch + 1)); // add 1 for the NULL character
hr = __HRESULT_FROM_WIN32(RegSetValueEx(hKey, pszName, 0, REG_SZ, reinterpret_cast<const BYTE*>(pszValue), cbData));
}
return hr;
}
///////////////////////////////////////////////////////////////////////
// Name: RegisterObject
// Desc: Creates the registry entries for a COM object.
//
// guid: The object's CLSID
// sDescription: Description of the object
// sThreadingMode: Threading model. e.g., "Both"
///////////////////////////////////////////////////////////////////////
HRESULT RegisterObject(GUID guid, const TCHAR* pszDescription, const TCHAR* pszThreadingModel)
{
HRESULT hr = S_OK;
TCHAR pszTemp[MAX_PATH];
HKEY hKey = NULL;
HKEY hSubkey = NULL;
DWORD dwRet = 0;
do
{
hr = CreateObjectKeyName(guid, pszTemp, MAX_PATH);
if (FAILED(hr))
{
break;
}
hr = __HRESULT_FROM_WIN32(RegCreateKeyEx(HKEY_CLASSES_ROOT, pszTemp, 0, NULL, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &hKey, NULL));
if (FAILED(hr))
{
break;
}
hr = SetKeyValue(hKey, NULL, pszDescription);
if (FAILED(hr))
{
break;
}
hr = __HRESULT_FROM_WIN32(RegCreateKeyEx(hKey, L"InprocServer32", 0, NULL, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &hSubkey, NULL));
if (FAILED(hr))
{
break;
}
dwRet = GetModuleFileName(g_hModule, pszTemp, MAX_PATH);
if (dwRet == 0)
{
hr = __HRESULT_FROM_WIN32(GetLastError());
break;
}
if (dwRet == MAX_PATH)
{
hr = E_FAIL; // buffer too small
break;
}
hr = SetKeyValue(hSubkey, NULL, pszTemp);
if (FAILED(hr))
{
break;
}
hr = SetKeyValue(hSubkey, L"ThreadingModel", pszThreadingModel);
}
while (FALSE);
if (hSubkey != NULL)
{
RegCloseKey(hSubkey);
}
if (hKey != NULL)
{
RegCloseKey(hKey);
}
return hr;
}
///////////////////////////////////////////////////////////////////////
// Name: UnregisterObject
// Desc: Deletes the registry entries for a COM object.
//
// guid: The object's CLSID
///////////////////////////////////////////////////////////////////////
HRESULT UnregisterObject(GUID guid)
{
HRESULT hr = S_OK;
TCHAR pszTemp[MAX_PATH];
do
{
hr = CreateObjectKeyName(guid, pszTemp, MAX_PATH);
if (FAILED(hr))
{
break;
}
hr = __HRESULT_FROM_WIN32(RegDeleteTree(HKEY_CLASSES_ROOT, pszTemp));
}
while (FALSE);
return hr;
}
// DLL Exports
STDAPI CreateDX11VideoRenderer(REFIID riid, void** ppvObject)
{
return DX11VideoRenderer::CMediaSink::CreateInstance(riid, ppvObject);
}
STDAPI CreateDX11VideoRendererActivate(HWND hwnd, IMFActivate** ppActivate)
{
return DX11VideoRenderer::CActivate::CreateInstance(hwnd, ppActivate);
}
STDAPI DllCanUnloadNow(void)
{
return (DX11VideoRenderer::CBase::GetObjectCount() == 0 && DX11VideoRenderer::CClassFactory::IsLocked() == FALSE) ? S_OK : S_FALSE;
}
STDAPI DllGetClassObject(_In_ REFCLSID clsid, _In_ REFIID riid, _Outptr_ void** ppvObject)
{
if (clsid != CLSID_DX11VideoRenderer)
{
return CLASS_E_CLASSNOTAVAILABLE;
}
DX11VideoRenderer::CClassFactory* pFactory = new DX11VideoRenderer::CClassFactory();
if (pFactory == NULL)
{
return E_OUTOFMEMORY;
}
pFactory->AddRef();
HRESULT hr = pFactory->QueryInterface(riid, ppvObject);
SafeRelease(pFactory);
return hr;
}
BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
{
g_hModule = static_cast<HMODULE>(hModule);
break;
}
default:
{
break;
}
}
return TRUE;
}
STDAPI DllRegisterServer(void)
{
HRESULT hr = S_OK;
do
{
hr = RegisterObject(CLSID_DX11VideoRenderer, L"DX11 Video Renderer", L"Both");
if (FAILED(hr))
{
break;
}
hr = RegisterObject(CLSID_DX11VideoRendererActivate, L"DX11 Video Renderer Activate", L"Both");
if (FAILED(hr))
{
break;
}
hr = MFTRegister(
CLSID_DX11VideoRenderer, // CLSID
MFT_CATEGORY_OTHER, // Category
L"DX11 Video Renderer", // Friendly name
0, // Reserved, must be zero.
0,
NULL,
0,
NULL,
NULL
);
}
while (FALSE);
return hr;
}
STDAPI DllUnregisterServer(void)
{
HRESULT hr = UnregisterObject(CLSID_DX11VideoRenderer);
HRESULT hrTemp = MFTUnregister(CLSID_DX11VideoRenderer);
if (SUCCEEDED(hr))
{
hr = hrTemp;
}
return hr;
}