From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Devin Heitmueller <dheitmueller@kernellabs.com>,
Takashi Iwai <tiwai@suse.de>
Cc: alsa-devel@alsa-project.org, Lars-Peter Clausen <lars@metafoo.de>,
Linux Media Mailing List <linux-media@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"ramakrmu@cisco.com" <ramakrmu@cisco.com>,
Shuah Khan <shuahkh@osg.samsung.com>,
Hans Verkuil <hverkuil@xs4all.nl>,
Sander Eikelenboom <linux@eikelenboom.it>,
prabhakar.csengg@gmail.com, Antti Palosaari <crope@iki.fi>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
"sakari.ailus@linux.intel.com" <sakari.ailus@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Tim Gardner <tim.gardner@canonical.com>,
"olebowle@gmx.com" <olebowle@gmx.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Mauro Carvalho Chehab <m.chehab@samsung.com>
Subject: Re: [alsa-devel] [PATCH v2 5/6] sound/usb: pcm changes to use media token api
Date: Wed, 22 Oct 2014 14:26:41 -0500 [thread overview]
Message-ID: <544804F1.7090606@linux.intel.com> (raw)
In-Reply-To: <CAGoCfixD-zv1MMHUXLnjGV5KVB-DGdp2ZqZ0hUTR14UvLh-Gvw@mail.gmail.com>
On 10/21/14, 11:08 AM, 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.
this seems like a feature, not a bug. PulseAudio starts streaming before
clients push any data and likewise keeps sources active even after for
some time after clients stop recording. Closing VLC in your example
doesn't immediately close the ALSA device. look for
module-suspend-on-idle in your default.pa config file.
I also agree that the open/close of the alsa device is the only way to
control exclusion.
-Pierre
next prev parent reply other threads:[~2014-10-22 19:26 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-14 14:58 [PATCH v2 0/6] media token resource framework Shuah Khan
2014-10-14 14:58 ` [PATCH v2 1/6] media: add media token device " Shuah Khan
2014-10-15 17:05 ` Takashi Iwai
2014-10-16 0:53 ` Shuah Khan
2014-10-16 14:00 ` Takashi Iwai
2014-10-16 14:39 ` Shuah Khan
2014-10-21 10:46 ` Hans Verkuil
2014-10-21 11:51 ` Takashi Iwai
2014-10-21 11:58 ` Hans Verkuil
2014-10-21 13:07 ` Takashi Iwai
2014-11-18 21:33 ` Sakari Ailus
2014-10-14 14:58 ` [PATCH v2 2/6] media: v4l2-core changes to use media token api Shuah Khan
2014-10-14 14:58 ` [PATCH v2 3/6] media: au0828-video " Shuah Khan
2014-10-14 14:58 ` [PATCH v2 4/6] media: dvb-core " Shuah Khan
2014-10-14 14:58 ` [PATCH v2 5/6] sound/usb: pcm " Shuah Khan
2014-10-16 12:00 ` [alsa-devel] " Lars-Peter Clausen
2014-10-16 13:10 ` Shuah Khan
2014-10-16 14:01 ` Takashi Iwai
2014-10-16 14:10 ` Shuah Khan
2014-10-16 14:16 ` Takashi Iwai
2014-10-16 14:39 ` Shuah Khan
2014-10-16 14:48 ` Takashi Iwai
2014-10-16 14:59 ` Shuah Khan
2014-10-18 18:49 ` Mauro Carvalho Chehab
2014-10-19 9:00 ` Takashi Iwai
2014-10-21 15:42 ` Hans Verkuil
2014-10-21 16:05 ` Takashi Iwai
2014-10-21 16:08 ` Devin Heitmueller
2014-10-21 16:14 ` Takashi Iwai
2014-10-22 19:26 ` Pierre-Louis Bossart [this message]
2014-10-22 19:45 ` Devin Heitmueller
2014-10-24 14:44 ` Shuah Khan
2014-10-25 12:44 ` Mauro Carvalho Chehab
2014-10-25 13:20 ` Mauro Carvalho Chehab
2014-10-25 13:41 ` Mauro Carvalho Chehab
2014-10-26 8:27 ` Takashi Iwai
2014-10-27 12:52 ` Mauro Carvalho Chehab
2014-10-28 21:15 ` Shuah Khan
2014-10-28 23:42 ` [RFCv1] Media Token API needs - Was: " Mauro Carvalho Chehab
2014-10-29 0:00 ` Mauro Carvalho Chehab
2014-10-29 11:19 ` Mauro Carvalho Chehab
2014-10-29 16:06 ` Shuah Khan
2014-10-29 17:56 ` Mauro Carvalho Chehab
2014-11-04 23:08 ` [RFCv2] Media Token API Spec Shuah Khan
2014-11-10 14:15 ` Hans Verkuil
2014-11-18 21:15 ` Sakari Ailus
2014-11-18 21:27 ` Shuah Khan
2014-10-21 17:32 ` [alsa-devel] [PATCH v2 5/6] sound/usb: pcm changes to use media token api Shuah Khan
2014-10-22 15:24 ` Hans Verkuil
[not found] ` <20141025085742.43e20bb5.m.chehab@samsung.com>
2014-10-27 15:47 ` Shuah Khan
2014-10-14 14:58 ` [PATCH v2 6/6] media: au0828-core changes to create and destroy media Shuah Khan
2014-10-15 16:48 ` [PATCH v2 0/6] media token resource framework Takashi Iwai
2014-10-15 20:21 ` Shuah Khan
2014-10-16 14:02 ` Takashi Iwai
2014-10-29 9:17 ` Sakari Ailus
2014-10-29 9:33 ` Mauro Carvalho Chehab
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