A Brief Tutorial On How To Develop DirectShow Source Filter For Beginners

// MySourceFilter.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include <streams.h>
#include <olectl.h>
#include <initguid.h>

#include "MyStream.h"

#pragma warning(disable:4710)  // 'function': function not inlined (optimzation)
// {93304979-AAD1-4442-A1BD-503FC8CC883F}
DEFINE_GUID(CLSID_MySourceFilter, 
0x93304979, 0xaad1, 0x4442, 0xa1, 0xbd, 0x50, 0x3f, 0xc8, 0xcc, 0x88, 0x3f);

// Setup data

const AMOVIESETUP_MEDIATYPE sudOpPinTypes =
{
    &MEDIATYPE_Video,       // Major type
    &MEDIASUBTYPE_NULL      // Minor type
};

const AMOVIESETUP_PIN sudOpPin =
{
    L"Output",              // Pin string name
    FALSE,                  // Is it rendered
    TRUE,                   // Is it an output
    FALSE,                  // Can we have none
    FALSE,                  // Can we have many
    &CLSID_NULL,            // Connects to filter
    NULL,                   // Connects to pin
    1,                      // Number of types
    &sudOpPinTypes };       // Pin details

const AMOVIESETUP_FILTER sudMyax =
{
    &CLSID_MySourceFilter,    // Filter CLSID
    L"My Source Filter",       // String name
    MERIT_DO_NOT_USE,       // Filter merit
    1,                      // Number pins
    &sudOpPin               // Pin details
};

class CMySourceFilter:public CSource
{
public:

    // The only allowed way to create Bouncing balls!
    static CUnknown * WINAPI CreateInstance(LPUNKNOWN lpunk, HRESULT *phr);

private:
	CMySourceFilter(LPUNKNOWN lpunk, HRESULT *phr);
};


CMySourceFilter::CMySourceFilter(LPUNKNOWN lpunk, HRESULT *phr):
CSource(NAME("MySource"),lpunk,CLSID_MySourceFilter)
{
    CAutoLock cAutoLock(&m_cStateLock);
	
    m_paStreams    = (CSourceStream **) new CMyStream*[1];
    if (m_paStreams == NULL) {
        *phr = E_OUTOFMEMORY;
	return;
    }

    m_paStreams[0] = new CMyStream(phr, this, L"My Source OutPin");
    if (m_paStreams[0] == NULL) {
        *phr = E_OUTOFMEMORY;
	return;
    }

}

CFactoryTemplate g_Templates[] = {
  { L"My Source Filter"
  , &CLSID_MySourceFilter
  , CMySourceFilter::CreateInstance 
  , NULL
  , &sudMyax }
};
int g_cTemplates = sizeof(g_Templates) / sizeof(g_Templates[0]);


STDAPI DllRegisterServer()
{
    return AMovieDllRegisterServer2( TRUE );

} // DllRegisterServer


//
// DllUnregisterServer
//
STDAPI DllUnregisterServer()
{
    return AMovieDllRegisterServer2( FALSE );

} // DllUnregisterServer

CUnknown * WINAPI CMySourceFilter::CreateInstance(LPUNKNOWN lpunk, HRESULT *phr)
{
    CUnknown *punk = new CMySourceFilter(lpunk, phr);
    if (punk == NULL) {
        *phr = E_OUTOFMEMORY;
    }
    return punk;

} // CreateInstance