多媒体编程

开发平台：
Visual C++

PidMpeg1.cpp：源码内容
							// PidMpeg1.cpp : Defines the entry point for the DLL application.
//
#include <streams.h>          // quartz, includes windows
#include <stdio.h>
// Eliminate two expected level 4 warnings from the Microsoft compiler.
// The class does not have an assignment or copy operator, and so cannot
// be passed by value.  This is normal.  This file compiles clean at the
// highest (most picky) warning level (-W4).
#pragma warning(disable: 4511 4512)
#include "CMPEG1Builder.h"
#include <initguid.h>
#include "FltGuids.h"
//
// setup data
// List of class IDs and creator functions for the class factory. This
// provides the link between the OLE entry point in the DLL and an object
// being created. The class factory will call the static CreateInstance
CFactoryTemplate g_Templates[] = 
{
    { 
		L"PID MPEG1 Builder",
		&CLSID_PID_MPEG1Builder,
		CMPEG1Builder::CreateInstance,
		NULL,
		NULL 
	}
};
int g_cTemplates = sizeof(g_Templates) / sizeof(g_Templates[0]);
////////////////////////////////////////////////////////////////////////
//
// Exported entry points for registration and unregistration 
// (in this case they only call through to default implementations).
//
////////////////////////////////////////////////////////////////////////
HRESULT RegisterPIDInterface(CLSID  ClsidInterface, 
							 LPTSTR strName, 
							 CLSID  ClsidDistributor)
{
	TCHAR   achKey[MAX_PATH];
	TCHAR   achClsidInterface[CHARS_IN_GUID];
	TCHAR   achClsidDistributor[CHARS_IN_GUID];
	OLECHAR achTemp[CHARS_IN_GUID];
	HKEY    hkey, hsubkey;
	LONG    lReturn;
	HRESULT hr;
	hr = StringFromGUID2(ClsidInterface, achTemp, CHARS_IN_GUID);
	if (SUCCEEDED(hr))
	{
		wsprintf(achClsidInterface, "%ls", achTemp);
		hr = StringFromGUID2(ClsidDistributor, achTemp, CHARS_IN_GUID);
	}
	if (FAILED(hr)) return hr;
	wsprintf(achClsidDistributor, "%ls", achTemp);
	wsprintf(achKey, "Interface\%s", achClsidInterface);
	lReturn = RegCreateKey(HKEY_CLASSES_ROOT, achKey, &hkey);
	if (ERROR_SUCCESS == lReturn)
	{
		if (NULL != strName)
		{
			// Set the interface name
			RegSetValue(hkey, NULL, REG_SZ, strName, lstrlen(strName)+1);
		}
		lReturn = RegCreateKey(hkey, "Distributor", &hsubkey);
		if (ERROR_SUCCESS == lReturn)
		{
			// Set the default value of "Distributor" key
			RegSetValue(hsubkey, NULL, REG_SZ, achClsidDistributor, 
				lstrlen(achClsidDistributor)+1);
			RegCloseKey(hsubkey);
		}
		RegCloseKey(hkey);
	}
	return HRESULT_FROM_WIN32(lReturn);
}
HRESULT UnregisterPIDInterface(REFCLSID ClsidInterface)
{
	HKEY    hkey;
	LONG    lReturn;
	HRESULT hr;
	TCHAR   achClsidInterface[CHARS_IN_GUID];
	OLECHAR achTemp[CHARS_IN_GUID];
	// comvert CLSID to OLE string
	hr  = StringFromGUID2(ClsidInterface, achTemp, CHARS_IN_GUID);
	if (FAILED(hr)) return hr;
	// convert OLE string to ANSI (as that's
	// all that WIN95 Reg* calls can handle
	wsprintf(achClsidInterface, "%ls", achTemp);
	// open Interface key
	lReturn = RegOpenKeyEx(HKEY_CLASSES_ROOT, TEXT("Interface"), 
		0, MAXIMUM_ALLOWED, &hkey);
	if (ERROR_SUCCESS == lReturn)
	{
		// if successful, eliminate subkey and close
		// Interface key
		EliminateSubKey(hkey, achClsidInterface);
		RegCloseKey(hkey);
	}
	return HRESULT_FROM_WIN32(lReturn);
}
//
// DllRegisterServer
//
// Exported entry points for registration and unregistration
//
STDAPI DllRegisterServer()
{
	HRESULT hr = NOERROR;
	// Register as DirectShow Plug-in Distributor
	// HKEY_CLASSES_ROOTInterfaceIIDDistributor
	hr = RegisterPIDInterface(IID_IMPEG1Builder, TEXT("IMPEG1Builder"), 
		CLSID_PID_MPEG1Builder);
	if (SUCCEEDED(hr))
	{
		hr = AMovieDllRegisterServer2(TRUE);
	}
	return hr;
}
//
// DllUnregisterServer
//
STDAPI DllUnregisterServer()
{
	HRESULT hr = NOERROR;
	// Remove DirectShow Plug-in Distributor entries
	hr = UnregisterPIDInterface(IID_IMPEG1Builder);
	if (SUCCEEDED(hr))
	{
		hr = AMovieDllRegisterServer2(FALSE);
	}
    return hr;
}
//
// DllEntryPoint
//
extern "C" BOOL WINAPI DllEntryPoint(HINSTANCE, ULONG, LPVOID);
BOOL APIENTRY DllMain(HANDLE hModule, 
                      DWORD  dwReason, 
                      LPVOID lpReserved)
{
	return DllEntryPoint((HINSTANCE)(hModule), dwReason, lpReserved);
}
CUnknown * WINAPI CMPEG1Builder::CreateInstance(LPUNKNOWN lpunk, HRESULT *phr)
{
	ASSERT(phr);
	// Verify: we only allow filter graph manager to create us!
	if (!lpunk)
	{
		*phr = VFW_E_NEED_OWNER;
		return NULL;
	}
	IGraphBuilder * pGraphBuilder = NULL;
	if (FAILED(lpunk->QueryInterface(IID_IGraphBuilder, (void**)&pGraphBuilder)))
	{
		*phr = E_FAIL;
		return NULL;
	}
	if (pGraphBuilder)
	{
		pGraphBuilder->Release();
	}
	// Safe to create our COM object
	CUnknown *punk = new CMPEG1Builder(lpunk, phr);
	if (punk == NULL)
	{
		if (phr)
		{
			*phr = E_OUTOFMEMORY;
		}
	}
	return punk;
}

						