DirectShow Filter 基础与简单的示例程序

 1 #ifndef _FILTER_SAMPLE_H_  
 2 #define _FILTER_SAMPLE_H_  
 3   
 4 // {33B57142-BD07-4a77-AE91-A8F6C24A8F40}  
 5 DEFINE_GUID(CLSID_FilterSample,   
 6     0x33b57142, 0xbd07, 0x4a77, 0xae, 0x91, 0xa8, 0xf6, 0xc2, 0x4a, 0x8f, 0x40);  
 7   
 8 class CFilterSample: public CCritSec, public CBaseFilter  
 9 {  
10 public:  
11   CFilterSample(TCHAR *pName,LPUNKNOWN pUnk,HRESULT *hr);  
12   virtual ~CFilterSample();   
13   static CUnknown * WINAPI CreateInstance(LPUNKNOWN pUnk, HRESULT *phr);   
14   CBasePin *GetPin(int n);  
15   int GetPinCount();    
16 };  
17   
18 #endif  

 1 // FilterSample.cpp : 定义 DLL 应用程序的导出函数。  
 2 //  
 3   
 4 #include "stdafx.h"  
 5 #include "streams.h"  
 6 #include "initguid.h"  
 7   
 8 #include "FilterSample.h"  
 9   
10 // Using this pointer in constructor  
11 #pragma warning(disable:4355 4127)  
12   
13 //////////////////////////////////////////////////////////////////////////  
14 // AMOVIESETUP_FILTER 描述一个 Filter  
15 // AMOVIESETUP_PIN 描述 pin  
16 // AMOVIESETUP_MEDIATYPE 描述数据类型  
17 const AMOVIESETUP_MEDIATYPE sudPinTypes =  
18 {  
19   &MEDIATYPE_NULL,         // Major CLSID  
20   &MEDIASUBTYPE_NULL       // Minor type  
21 };  
22   
23 const AMOVIESETUP_PIN psudPins[] =  
24 {  
25   {   
26     L"Input",             // Pin‘s string name  
27     FALSE,                // Is it rendered  
28     FALSE,                // Is it an output  
29     FALSE,                // Allowed none  
30     FALSE,                // Allowed many  
31     &CLSID_NULL,          // Connects to filter  
32     L"Output",            // Connects to pin  
33     1,                    // Number of types  
34     &sudPinTypes          // Pin information  
35   },  
36   {  
37     L"Output",            // Pin‘s string name  
38     FALSE,                // Is it rendered  
39     TRUE,                 // Is it an output  
40     FALSE,                // Allowed none  
41     FALSE,                // Allowed many  
42     &CLSID_NULL,          // Connects to filter  
43     L"Input",             // Connects to pin  
44     1,                    // Number of types  
45     &sudPinTypes          // Pin information  
46   }  
47 };  
48   
49 const AMOVIESETUP_FILTER sudInfTee =  
50 {  
51   &CLSID_FilterSample,           // CLSID of filter  
52   L"Filter Sample Test Lib",     // Filter‘s name  
53   MERIT_DO_NOT_USE,              // Filter merit  
54   2,                             // Number of pins  
55   psudPins                       // Pin information  
56 };  
57 //////////////////////////////////////////////////////////////////////////  
58   
59 CFactoryTemplate g_Templates[1] =   
60 {  
61   {  
62     L"Filter Sample",                // Name  
63     &CLSID_FilterSample,             // CLSID  
64     CFilterSample::CreateInstance,   // Method to create an instance of MyComponent  
65     NULL,                            // Initialization function  
66     &sudInfTee                       // Set-up information (for filters)  
67   }  
68 };  
69 int g_cTemplates = sizeof(g_Templates) / sizeof(g_Templates[0]);  
70   
71   
72 CFilterSample::CFilterSample(TCHAR *pName,LPUNKNOWN pUnk,HRESULT *hr)  
73   :CBaseFilter(NAME("Filter Sample"), pUnk, this, CLSID_FilterSample)  
74 {  
75 }  
76   
77 CFilterSample::~CFilterSample()  
78 {  
79 }   
80   
81 CBasePin * CFilterSample::GetPin(int n)  
82 {  
83   return NULL;  
84 }  
85 int CFilterSample::GetPinCount()  
86 {  
87   return 0;  
88 }  
89   
90 CUnknown * WINAPI CFilterSample::CreateInstance(LPUNKNOWN pUnk, HRESULT *pHr)  
91 {  
92   CFilterSample *pFilter = new CFilterSample(NAME("Filter Sample"), pUnk, pHr);  
93   if (pFilter== NULL)  
94   {  
95     *pHr = E_OUTOFMEMORY;  
96   }  
97   return pFilter;  
98 }