写虚拟网络摄像头？ [英] Writing a virtual webcam?

问题描述

我需要创建一个虚拟网络摄像头，作为网络摄像头，但作为输入一组图像，它播放。我看过像ManyCam和Fake Webcam这样的解决方案，但他们似乎有一个限制或其他（分辨率，最大文件大小，fps等）我正在Windows XP SP3。

I need to create a virtual webcam that poses as a webcam, but takes as input a set of images that it plays. I have seen solutions like ManyCam, and Fake Webcam, but they all seem to one limitation or the other (resolution, max file size, fps etc.) I am working on Windows XP SP3.

我知道我必须为这个任务写一个WIA接口，但是作为一个Python程序员，我从来没有为设备编写驱动程序或接口。编写此接口的主要任务是什么？

I understand that I have to write a WIA interface for this task, but being a Python programmer, I have never written drivers or interfaces to devices. What are the main tasks in writing this interface ? What would the flow look like ?

推荐答案

您需要编写DirectShow过滤器，它是一个COM服务器，实现 IPin ，< a href =http://msdn.microsoft.com/en-us/library/dd319784%28v=vs.85%29.aspx> IAMStreamConfig 与 IKsPropertySet 接口。对于 IPin 部分，最好先继承 CSourceStream 类，因为您需要获取Windows SDK，安装SDK将会有一个DirectShow Base在 samples\multimedia\directshow 文件夹中的类源，你会发现 CSourceStream （在许多其他） 。 DllRegisterServer COM服务器的功能应该使用过滤器映射器在 CLSID_VideoInputDeviceCategory 类别中注册您的过滤器。

You need to write DirectShow filter which is a COM server that implements an IPin, IAMStreamConfig and IKsPropertySet interfaces. For the IPin part you'd better to start by inheriting the CSourceStream class, for that you need to get the Windows SDK, having the SDK installed there would be a DirectShow Base Classes sources in samples\multimedia\directshow folder, there you'll find the CSourceStream (among many others). DllRegisterServer function of the COM server should register your filter within CLSID_VideoInputDeviceCategory category using filter mapper.

构建COM服务器后，您可以使用 regsvr32 工具注册它，并且您的虚拟网络摄像头应显示在网络摄像头列表中。

After building the COM-server, you register it with regsvr32 tool, and your virtual webcam should appear in the web cam lists.

同时检查 samples\multimedia\directshow\filters\ball 示例，可以改进并用作您的任务的起点。

Also check the samples\multimedia\directshow\filters\ball sample that can be improved and used as a starting point for your task.

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