Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1176520AbdDYIMO (ORCPT ); Tue, 25 Apr 2017 04:12:14 -0400 Received: from mail-wm0-f66.google.com ([74.125.82.66]:35657 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1176422AbdDYIIT (ORCPT ); Tue, 25 Apr 2017 04:08:19 -0400 Date: Tue, 25 Apr 2017 10:08:15 +0200 From: Pali =?utf-8?B?Um9ow6Fy?= To: Pavel Machek Cc: Mauro Carvalho Chehab , sre@kernel.org, kernel list , linux-arm-kernel , linux-omap@vger.kernel.org, tony@atomide.com, khilman@kernel.org, aaro.koskinen@iki.fi, ivo.g.dimitrov.75@gmail.com, patrikbachan@gmail.com, serge@hallyn.com, abcloriens@gmail.com, Sakari Ailus , Sakari Ailus , linux-media@vger.kernel.org Subject: Re: support autofocus / autogain in libv4l2 Message-ID: <20170425080815.GD30553@pali> References: <1487074823-28274-1-git-send-email-sakari.ailus@linux.intel.com> <1487074823-28274-2-git-send-email-sakari.ailus@linux.intel.com> <20170414232332.63850d7b@vento.lan> <20170416091209.GB7456@valkosipuli.retiisi.org.uk> <20170419105118.72b8e284@vento.lan> <20170424093059.GA20427@amd> <20170424103802.00d3b554@vento.lan> <20170424212914.GA20780@amd> <20170424224724.5bb52382@vento.lan> <20170425080538.GA30380@amd> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20170425080538.GA30380@amd> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 937 Lines: 21 On Tuesday 25 April 2017 10:05:38 Pavel Machek wrote: > > > It would be nice if more than one application could be accessing the > > > camera at the same time... (I.e. something graphical running preview > > > then using command line tool to grab a picture.) This one is > > > definitely not solveable inside a library... > > > > Someone once suggested to have something like pulseaudio for V4L. > > For such usage, a server would be interesting. Yet, I would code it > > in a way that applications using libv4l will talk with such daemon > > in a transparent way. > > Yes, we need something like pulseaudio for V4L. And yes, we should > make it transparent for applications using libv4l. IIRC there is already some effort in writing such "video" server which would support accessing more application into webcam video, like pulseaudio server for accessing more applications to microphone input. -- Pali Rohár pali.rohar@gmail.com