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

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Message-ID: <CAGoCfixD-zv1MMHUXLnjGV5KVB-DGdp2ZqZ0hUTR14UvLh-Gvw@mail.gmail.com>
Date:	Tue, 21 Oct 2014 12:08:59 -0400
From:	Devin Heitmueller <dheitmueller@...nellabs.com>
To:	Takashi Iwai <tiwai@...e.de>
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

> 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.

Devin

-- 
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com
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