ok alexander...i have an anothere doubt....you told that "usermode
programmer shouldn't care what types of video devices are installed on
the system.. And it also simplifies writing drivers for video devices: all the stuff
regarding interactions between kernel and applications is already done
in V4L2"
but i have an zebronics webcam...the driver for that webcam is "zc0301"...whether this webcam will work without this "zc0301" driver....?
"
--- On Fri, 2/1/09, Alexander Potashev <aspotashev@xxxxxxxxx> wrote:
From: Alexander Potashev <aspotashev@xxxxxxxxx>
Subject: Re: xawtv
To: "niamathullah sharief" <shariefbe@xxxxxxxxxxx>
Cc: "Kernel newbies" <kernelnewbies@xxxxxxxxxxxx>
Date: Friday, 2 January, 2009, 6:56 PM
On 17:49 Fri 02 Jan , niamathullah sharief wrote:
>
> ok...can you tell me what is "video4linux2" is?is it a driver to
capture the image?or something else?
video4linux2 is Linux kernel subsystem, it registers video device class
and provides an abstract API to the applications, so that a usermode
programmer shouldn't care what types of video devices are installed on
the system.
And it also simplifies writing drivers for video devices: all the stuff
regarding interactions between kernel and applications is already done
in V4L2.
Thus, V4L2 is a layer between hardware drivers and kernel API (syscalls
-- mostly ioctl, files in /sys, ...)
Link grabbed from linux-2.6/Documentation/video4linux/API.html:
http://www.linuxtv.org/downloads/video4linux/API/V4L2_API
Alexander
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