Re: [Playerstage-users] camerav4l2 plugin for Player 2.2.SVN

[Paul O. <new...@ki...>]

New improved version: 
http://king.net.pl/playercontrib/plugins/player2.2/camerav4l2-threaded-20090422.tar.gz
What's new? The 'failsafe' option, set to OFF by default. The 878A chip 
has some nasty feature of hanging up when signal quality is low or signal 
is noisy (for example, if there's a tv tuner connected to channel 0 and no 
antenna is attached). Grabbing such signal for longer time causes grab 
function to fail (fortunately, overlay is not causing troubles similar to 
those caused by grab, use XawTV or any other application that can do 
overlay to tune your TV channels).
A trick that can be done in such cases is to close grabber device and 
reopen it again. It is done when 'failsafe' option is set to ON. This 
saves player server from breaking its operation whenever grabbing fails. 
ATENTION! Experiments shows that abusing this feature for longer time can 
crash your kernel! I guess bttv kernel module did not expect that an 
application can handle with problems that way. This trick was designed for 
managing with noisy peaks of signal that normally would crash Player 
server instance. I suggest not to use this for the signal which is bad all 
the time. Use at your own risk.

Cheers,
Paul

On Tue, 21 Apr 2009, Paul Osmialowski wrote:

> I can confirm that this driver works fine on latest kernels (2.6.27 and
> later, they have broken compatibility with old V4L). Today I was
> succesfully testing it with Fedora 9 and 10 where regular camerav4l driver
> did not work and only cvcam could be used (which has some tweaking
> limitations).
>
> Cheers,
> Paul
>
> On Mon, 20 Apr 2009, Paul Osmialowski wrote:
>
>> Hello all,
>>
>> I've created some useful camera plugin compatible with the most recent
>> Player API (ThreadedDriver) that uses V4L2 API. Comparing to camerav4l
>> already present in Player, my driver has new features:
>>
>> 1. BRGB (bayer to RGB) decoding for sn9c1xx-based cameras (Copyright (C)
>> 2004 Takafumi Mizuno)
>> 2. Many sources can be used per one v4l2 device (most bt848, bt878 and
>> 878a PCI cards has at least 3 channels), all of them can be provided as
>> separate camera interfaces. Note that switching between channels takes 0.5
>> sec or more, so it can't be used for real-time media streaming!
>>
>> You can get it from here:
>> http://king.net.pl/playercontrib/plugins/player2.2/camerav4l2-threaded-20090420.tar.gz
>>
>> Cheers,
>> Paul
>>
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>
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