How to use imfinfo function

The steps to use the imfinfo function: 1. Create an IMFSourceReader object; 2. Set the media source; 3. Obtain the media format information. The IMFInfo function is a function used to obtain the media format information of an audio or video stream. It is part of the Windows Media Foundation framework and is used to process audio, video and other media content.

The IMFInfo function is a function used to obtain the media format (Media Format) information of the audio or video stream. It is part of the Windows Media Foundation (WMF) framework and is used for processing audio, video and other media content.

The use of the IMFInfo function usually involves the following steps:

1. Create an IMFSourceReader object: First, you need to create an IMFSourceReader object using the CreateInstance method of IMFSourceReader. This method will return an instance of the IMFSourceReader interface for reading media stream data.

2. Set the media source: Use the SetSource method of the IMFSourceReader object to set the media source to the audio or video file you want to read. You need to provide the path or URL of the media file.

3. Obtain media format information: Once the media source is set, you can use the ReadSample method of the IMFSourceReader object to read the media stream data. Before calling the ReadSample method, you need to use the GetMediaType method of the IMFSourceReader interface to obtain the media format information of the current media source. This will return an IMFMediaType object containing information about the media format such as encoding format, resolution, etc.

The following is a sample code for using the IMFInfo function to obtain media format information:

// 创建IMFSourceReader对象  
IMFSourceReader* pSourceReader = NULL;  
HRESULT hr = CoCreateInstance(__uuidof(MediaFoundation::IMFSourceReader), NULL, CLSCTX_INPROC_SERVER, IID_IMFSourceReader, (void**)&pSourceReader);  
if (SUCCEEDED(hr)) {  
    // 设置媒体源  
    hr = pSourceReader->SetSource(mediaFilePath, NULL);  
    if (SUCCEEDED(hr)) {  
        // 获取媒体格式信息  
        IMFMediaType* pMediaType = NULL;  
        hr = pSourceReader->GetMediaType(&pMediaType);  
        if (SUCCEEDED(hr)) {  
            // 在这里处理媒体格式信息  
            // ...  
            pMediaType->Release();  
        }  
    }  
    pSourceReader->Release();  
}

In the above example, mediaFilePath is the path to the media file you want to read. By calling the GetMediaType method, you can obtain an IMFMediaType object that contains information about the media format. You can query the object's properties to get the details you need, such as encoding format, resolution, etc.

Please note that the above sample code only demonstrates how to use the IMFInfo function to obtain media format information. In actual applications, you may also need to handle other errors and exceptions, and perform further processing and operations according to your needs.

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