如何修改Asf Writer中的profile，以达到改变输出屏幕大小？

来源：互联网发布：静态nat加端口号配置编辑：程序博客网时间：2024/04/27 22:31

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;
}