修改Asf Writer中的profile以达到改变屏幕大小的步骤

贴上最近的源代码：(注意一下里面的PIN值)

ConfigAsfWriter (CComQIPtr<IWMProfile> profile,int width,int height,int nQuality)

{

HRESULT hr;

// CComQIPtr<IConfigAsfWriter> pConfig = m_pAsfWriter;

DWORD dwBitrate = nQuality;//m_myConfig.nQuality;//nQuality//92160;//921600;

CComQIPtr<IWMProfile> pProfile = profile;

//删除多余的其它流数据,否则会出错

DWORD nStreamCount;

hr = pProfile->GetStreamCount(&nStreamCount);

ASSERT (nStreamCount <= 2); //最多只能有两个接口，否则不是期望的profile

ERROR_BOX2(hr);

if (nStreamCount > 1)

{

hr = pProfile->RemoveStreamByNumber(1);

ERROR_BOX2(hr);

}

CComQIPtr<IWMStreamConfig> pStreamConfig;

hr = pProfile->GetStream(0, &pStreamConfig); //因为应该只有一个流，所以获取视频流的

ERROR_BOX2(hr);

/////设置视频流的属性

//CComQIPtr<IWMMediaProps> pMediaProps;

CComQIPtr<IWMVideoMediaProps> pMediaProps;

pMediaProps = pStreamConfig;

ASSERT (!!pMediaProps);

hr = pStreamConfig->SetBitrate(dwBitrate);

ERROR_BOX2(hr);

//WM_MEDIA_TYPE *pType = reinterpret_cast<WM_MEDIA_TYPE *>( &mt );

WM_MEDIA_TYPE *mediaType;

DWORD bufsize;

pMediaProps->GetMediaType(NULL,&bufsize);

BYTE *pBuf = new BYTE[bufsize];

mediaType = (WM_MEDIA_TYPE*) pBuf;

pMediaProps->GetMediaType(mediaType,&bufsize);

VIDEOINFOHEADER *pVih = reinterpret_cast<VIDEOINFOHEADER*>(mediaType->pbFormat);

//VIDEOINFOHEADER *pVih2 = reinterpret_cast<VIDEOINFOHEADER*>(pType->pbFormat);

//memcpy (pVih,pVih2,sizeof(VIDEOINFOHEADER));

pVih->bmiHeader.biWidth = width;//m_myConfig.videoWidth;//pVih2->bmiHeader.biWidth;

pVih->bmiHeader.biHeight = height;//m_myConfig.videoHeight;//pVih2->bmiHeader.biHeight;

pVih->bmiHeader.biSizeImage = GetBitmapSize(&pVih->bmiHeader);//pVih2->bmiHeader.biSizeImage;

mediaType->bFixedSizeSamples = 1;

mediaType->lSampleSize = pVih->bmiHeader.biSizeImage;

RECT src = {0,0,pVih->bmiHeader.biWidth,pVih->bmiHeader.biHeight};

pVih->rcSource = src;

pVih->rcTarget = src;

pVih->dwBitRate = dwBitrate;

hr = pMediaProps->SetMediaType (mediaType);

ERROR_BOX2(hr);

hr = pProfile->ReconfigStream (pStreamConfig);

ERROR_BOX2(hr);

// hr = pConfig->ConfigureFilterUsingProfile(pProfile);

// ERROR_BOX2(hr);

delete []pBuf;

// m_pProfile = pProfile;

return hr;

}

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