linux-kernel - Re: [alsa-devel] [PATCH v2 5/6] sound/usb: pcm changes to use media token api

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Date:	Tue, 21 Oct 2014 18:14:41 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Devin Heitmueller <dheitmueller@...nellabs.com>
Cc:	Hans Verkuil <hverkuil@...all.nl>,
	Shuah Khan <shuahkh@....samsung.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Antti Palosaari <crope@....fi>,
	"olebowle@....com" <olebowle@....com>,
	"ramakrmu@...co.com" <ramakrmu@...co.com>,
	"sakari.ailus@...ux.intel.com" <sakari.ailus@...ux.intel.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	perex@...ex.cz, prabhakar.csengg@...il.com,
	Tim Gardner <tim.gardner@...onical.com>,
	Sander Eikelenboom <linux@...elenboom.it>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	alsa-devel@...a-project.org,
	Linux Media Mailing List <linux-media@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH v2 5/6] sound/usb: pcm changes to use media token api

At Tue, 21 Oct 2014 12:08:59 -0400,
Devin Heitmueller wrote:
> 
> > Sorry, I'm not convinced by that.  If the device has to be controlled
> > exclusively, the right position is the open/close.  Otherwise, the
> > program cannot know when it becomes inaccessible out of sudden during
> > its operation.
> 
> I can say that I've definitely seen cases where if you configure a
> device as the "default" capture device in PulseAudio, then pulse will
> continue to capture from it even if you're not actively capturing the
> audio from pulse.  I only spotted this because I had a USB analyzer on
> the device and was dumbfounded when the ISOC packets kept arriving
> even after I had closed VLC.

You might have had an input monitor active in some PA apps?
PA shouldn't do it as default.  If it does unintentionally, you should
report it to PA guys.


Takashi
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