linux-kernel - Re: [linux-dvb] [PATCH] Userspace tuner

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Date:	Tue, 18 Sep 2007 19:00:58 -0400
From:	Alan Cox <alan@...hat.com>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	Jelle Foks <jelle@...s.8m.com>,
	"video4linux-list@...hat.com" <video4linux-list@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-dvb@...uxtv.org" <linux-dvb@...uxtv.org>
Subject: Re: [linux-dvb] [PATCH] Userspace tuner

On Tue, Sep 18, 2007 at 07:56:05PM -0300, Mauro Carvalho Chehab wrote:
> proprietary format. This way, an userspace app may use the userspace
> library as a "fallback method" for unknown FOURCC formats. The result
> will be probably far away from an optimal result on some cases (since it
> probably mean double buffering), but this will at least allow userspace
> apps to work. As performance become an issue, the userspace app
> developer may use the GPL code at userspace API as a reference to write
> a proper optimized format driver for its apps.

You can dynamically load libraries based on constructed path names which
means you can write a simple library for media conversions which in turn
will try and open libv4l-format-ABCD.so for any format it doesn't know - and
thus is extensible

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