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下载本过滤器DLL
本过滤器将MP3音频流写到MP3音频文件。

过滤器信息

过滤器名称：写MP3_2
过滤器GUID：{AE46BC15-71E5-471C-8540-3B73094111EC}
DLL注册函数名：DllRegisterServer
删除注册函数名：DllUnregisterServer
过滤器有1个输入引脚。

输入引脚标识：In
输入引脚媒体类型：
主要类型：MEDIATYPE_Audio
子类型：{0x00000055, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
格式类型：FORMAT_WaveFormatEx

过滤器DLL的全部代码

DLL.h

#ifndef  DLL_FILE
#define DLL_FILE#include "strmbase10.h"//过滤器基础类定义文件#if _DEBUG
#pragma comment(lib, "strmbasd10.lib")//过滤器基础类实现文件调试版本
#else
#pragma comment(lib, "strmbase10.lib")//过滤器基础类实现文件发布版本
#endif// {AE46BC15-71E5-471C-8540-3B73094111EC}
DEFINE_GUID(CLSID_WriteMP3,0xae46bc15, 0x71e5, 0x471c, 0x85, 0x40, 0x3b, 0x73, 0x9, 0x41, 0x11, 0xec);DEFINE_GUID(MEDIASUBTYPE_MP3,0x00000055, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);template <class T> void SafeRelease(T** ppT)
{if (*ppT){(*ppT)->Release();*ppT = NULL;}
}class CFilter;class CInputPin : public CBaseInputPin
{friend class CFilter;CFilter *pCFilter;
public:CInputPin(CFilter *pFilter, HRESULT *phr, LPCWSTR pPinName);~CInputPin();HRESULT CheckMediaType(const CMediaType *pmt);STDMETHODIMP Receive(IMediaSample *pSample);HRESULT Active();HRESULT Inactive();HANDLE hFile = NULL;//输出文件句柄
};class CFilter : public CBaseFilter, public CCritSec, public IFileSinkFilter
{friend class CInputPin;
public:CFilter(LPWSTR lpName, LPUNKNOWN pUnk, HRESULT *phr);virtual ~CFilter();DECLARE_IUNKNOWNSTDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void ** ppv);virtual HRESULT STDMETHODCALLTYPE  SetFileName(LPCOLESTR pszFileName, const AM_MEDIA_TYPE *pmt);virtual HRESULT STDMETHODCALLTYPE  GetCurFile(LPOLESTR * ppszFileName, AM_MEDIA_TYPE *pmt);static CUnknown * WINAPI CreateInstance(LPUNKNOWN, HRESULT *);int GetPinCount();CBasePin *GetPin(int n);STDMETHODIMP Run(REFERENCE_TIME tStart);CInputPin *m_pInputPin;   //输入引脚指针WCHAR* m_pFileName = NULL;//要创作的MP3文件路径
};#endif //DLL_FILE

DLL.cpp

#include "DLL.h"const AMOVIESETUP_MEDIATYPE sudPinTypes =
{&MEDIATYPE_Audio,              //主要类型&MEDIASUBTYPE_MP3              //子类型
};const AMOVIESETUP_PIN sudPin =     //引脚信息
{L"In",                         //引脚名称FALSE,                         //渲染引脚FALSE,                         //输出引脚FALSE,                         //具有该引脚的零个实例FALSE,                        //可以创建一个以上引脚的实例&CLSID_NULL,                  //该引脚连接的过滤器的类标识NULL,                         //该引脚连接的引脚名称1,                            //引脚支持的媒体类型数&sudPinTypes                  //媒体类型信息
};const AMOVIESETUP_FILTER WriteMP3 = //过滤器的注册信息
{&CLSID_WriteMP3,                //过滤器的类标识L"写MP3_2",                     //过滤器的名称MERIT_DO_NOT_USE,               //过滤器优先值1,                              //引脚数量&sudPin                        //引脚信息
};CFactoryTemplate g_Templates[] = {{L"写MP3_2"                   //对象（这里为过滤器）名称, &CLSID_WriteMP3            //对象CLSID的指针, CFilter::CreateInstance    //创建对象实例的函数的指针, NULL                       //指向从DLL入口点调用的函数的指针, &WriteMP3                  //指向AMOVIESETUP_FILTER结构的指针}
};int g_cTemplates = 1;STDAPI DllRegisterServer()//注册DLL
{return AMovieDllRegisterServer2(TRUE);
}STDAPI DllUnregisterServer()//删除DLL注册
{return AMovieDllRegisterServer2(FALSE);
}extern "C" BOOL WINAPI DllEntryPoint(HINSTANCE, ULONG, LPVOID);BOOL APIENTRY DllMain(HANDLE hModule, DWORD  dwReason, LPVOID lpReserved)
{return DllEntryPoint((HINSTANCE)(hModule), dwReason, lpReserved);
}

CFilter.cpp

#include "DLL.h"
#include "strsafe.h"CFilter::CFilter(LPWSTR lpName, LPUNKNOWN pUnk, HRESULT *phr) : CBaseFilter(lpName, pUnk, (CCritSec *) this, CLSID_WriteMP3)
{m_pInputPin = new CInputPin(this, phr, L"In");//创建输入引脚
}CFilter::~CFilter()
{if (m_pFileName != NULL)delete[] m_pFileName;
}CUnknown * WINAPI CFilter::CreateInstance(LPUNKNOWN pUnk, HRESULT *phr)
{return new CFilter(L"写MP3_2", pUnk, phr);//创建过滤器
}int CFilter::GetPinCount()
{return 1;
}CBasePin *CFilter::GetPin(int n)
{if (n != 0){return NULL;}return m_pInputPin;
}STDMETHODIMP CFilter::NonDelegatingQueryInterface(REFIID iid, void ** ppv)
{if (iid == IID_IFileSinkFilter){return GetInterface(static_cast<IFileSinkFilter*>(this), ppv);}elsereturn CBaseFilter::NonDelegatingQueryInterface(iid, ppv);
}HRESULT CFilter::GetCurFile(LPOLESTR *ppszFileName, AM_MEDIA_TYPE *pmt)
{CheckPointer(ppszFileName, E_POINTER);*ppszFileName = NULL;if (m_pFileName != NULL){size_t len = 1 + lstrlenW(m_pFileName);*ppszFileName = (LPOLESTR)QzTaskMemAlloc(sizeof(WCHAR) * (len));if (*ppszFileName != NULL){HRESULT hr = StringCchCopyW(*ppszFileName, len, m_pFileName);}}if (pmt){ZeroMemory(pmt, sizeof(*pmt));pmt->majortype = MEDIATYPE_NULL;pmt->subtype = MEDIASUBTYPE_NULL;}return S_OK;
}HRESULT CFilter::SetFileName(LPCOLESTR pszFileName, const AM_MEDIA_TYPE *pmt)
{CheckPointer(pszFileName, E_POINTER);if (wcslen(pszFileName) > MAX_PATH || wcslen(pszFileName)<4)return ERROR_FILENAME_EXCED_RANGE;size_t len = 1 + lstrlenW(pszFileName);m_pFileName = new WCHAR[len];if (m_pFileName == 0)return E_OUTOFMEMORY;HRESULT hr = StringCchCopyW(m_pFileName, len, pszFileName);if (m_pFileName[len - 2] != '3' || m_pFileName[len - 3] != 'p' || m_pFileName[len - 4] != 'm' || m_pFileName[len - 5] != '.')//如果不是MP3文件{delete[] m_pFileName; m_pFileName = NULL;return VFW_E_INVALID_FILE_FORMAT;//设置文件名失败}return S_OK;
}STDMETHODIMP CFilter::Run(REFERENCE_TIME tStart)
{if (m_pFileName == NULL){MessageBox(NULL, L"未指定输出文件", L"写MP3_2", MB_OK); return S_FALSE;}return CBaseFilter::Run(tStart);
}

CInputPin.cpp

#include "DLL.h"
#include "mmreg.h"CInputPin::CInputPin(CFilter *pFilter, HRESULT *phr, LPCWSTR pPinName) : CBaseInputPin(NAME("In"), pFilter, pFilter, phr, pPinName)
{pCFilter = pFilter;
}CInputPin::~CInputPin()//输入引脚析构函数
{}HRESULT CInputPin::CheckMediaType(const CMediaType *pmt)
{if (pmt->majortype == MEDIATYPE_Audio && pmt->subtype == MEDIASUBTYPE_MP3 && pmt->formattype == FORMAT_WaveFormatEx){WAVEFORMATEX* p = (WAVEFORMATEX*)pmt->pbFormat;if (p->wFormatTag != 85)return S_FALSE;return S_OK;}elsereturn S_FALSE;
}HRESULT CInputPin::Receive(IMediaSample * pSample)//接收函数
{HRESULT hr;BYTE* pBy = NULL;hr = pSample->GetPointer(&pBy);//获取引脚样本缓冲区指针long len = pSample->GetActualDataLength();//获取有效数据长度if (hFile){WriteFile(hFile, pBy, len, NULL, NULL);//写MP3数据}return S_OK;
}HRESULT CInputPin::Active()
{if (pCFilter->m_pFileName == NULL){MessageBox(0, L"没有指定输出文件", L"写MP3_2", MB_OK); return S_FALSE;}hFile = CreateFile(pCFilter->m_pFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);//创建输出文件if (INVALID_HANDLE_VALUE == hFile){MessageBox(0, L"创建输出文件失败", L"写MP3_2", MB_OK); return S_FALSE;}char chID[3] = { 'I','D','3' };WriteFile(hFile, chID, 3, NULL, NULL);//写标识BYTE by1 = 3;WriteFile(hFile, &by1, 1, NULL, NULL);//写版本号：ID3V2.3BYTE by2 = 0;WriteFile(hFile, &by2, 1, NULL, NULL);//写副版本号BYTE by3 = 0;WriteFile(hFile, &by3, 1, NULL, NULL);//写标志DWORD mSize = 0;WriteFile(hFile, &mSize, 4, NULL, NULL);//写标签大小return CBaseInputPin::Active();
}HRESULT CInputPin::Inactive()
{CloseHandle(hFile);//关闭输出文件hFile = NULL;return CBaseInputPin::Inactive();
}

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