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From: Mauro Carvalho Chehab <mchehab@redhat.com>
Since applications aren't prepared to handle all V4L2 available formats,
an effort is done to have a library capable of understanding especially
the proprietary formats.
This patch documents this library, and adds v4l2grab.c as an example on
how to use it.
Parts of the text are based at the libv4l README file (c) by Hans de
Goede.
Thanks to Hans de Goede <hdegoede@redhat.com> for his good work with
libv4l.
Priority: normal
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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From: Mauro Carvalho Chehab <mchehab@redhat.com>
To be simple, there's no format conversion inside v4l2grab. It relies
that libv4l will do the hard work of converting whatever input format
into RGB24.
Instead of just proceeding and writing wrong images, die if libv4l can't
convert into RGB24.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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From: Mauro Carvalho Chehab <mchehab@redhat.com>
During FISL 10 (Forum Internacional de Software Livre) and the first FudCon Latam
(Fedora Users and Developers Conference), while preparing the V4L panel, I and Douglas
noticed the need of a very simple application to be an example for developers to
test their drivers and to write newer v4l2 applications.
So, we come to the idea of creating a v4l2grab application that takes pictures from the
webcam and saves them with the ppm format, using libv4l to work with all webcam models.
This application uses the absolute minimum of V4L2 calls to take 640x480 pictures, and was tested
with uvcvideo and vivi drivers.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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