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  1. #1
    Just Joined!
    Join Date
    Sep 2008

    Question Multi-media support by Device Drivers on Linux


    I just spotted this forum, and I hope that there are some people here who might give me some tips for my issue. The issue is a small part of a Device Driver that Iím going to write for an unsupported webcam on Linux. Due to private reasons, the driver wonít be open-source. Therefore all the logic will be home made, but the code for e.g. the image processing can be fetched from available windows driver source code.

    All this wonít be a problem, using the Internet and the LDD book will give enough input to create something. The part that isnít quite clear now, is the multi-media support on Linux. A webcam driver on Windows mostly implements multi-media support by using DirectX output pins and filters between a driver output pin and video-in pin for e.g. Direct-Show. My main problem right now is getting some know-how on this item on the Linux OS.

    The webcam will be available in the /dev as an own node and the specific functions will be controlled by Sysfs. What isnít quite clear, is how to output the Ďstreamingí video from the driver to the /dev pin. Iím going to look how itís implemented in other drivers, because I canít find any documentation regarding this subject. How is this controlled on Linux and what kind of mechanism needs to be implemented in a driver to achieve this.

    Iíve already searched a lot, but it isnít clear to me. Can someone point me in the right direction?

    Tnx in advance!

  2. #2
    I did just a brief look into linux source code and maybe directory Documentation/video4linux could give some hints.


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