[Blink] Blink for Linux hangs on second call when using PulseAudio input device

Jeff Pyle jeff at ugnd.org
Sat May 11 14:30:57 CEST 2019


Another option is to tell PA to ignore certain devices.  I use this for a
few devices I never want in PA:

$ cat /etc/udev/rules.d/89-pulseaudio-usb.rules
> # Ignore SignaLink

ATTRS{idVendor}=="08bb", ATTRS{idProduct}=="2904", ENV{PULSE_IGNORE}="1"
> # Ignore Alesis iO|2
> ATTRS{idVendor}=="13b2", ATTRS{idProduct}=="0008", ENV{PULSE_IGNORE}="1"

The ENV{PULSE_IGNORE}="1" is the key to PA leaving it alone.

The vendor and product ID aren't hard to find.  For example, for the old
Alesis I use only in JACK:

$ lsusb | grep Alesis
> Bus 002 Device 002: ID 13b2:0008 Alesis

This is on Arch although I suspect it will work the same regardless of the
specific PA implementation.

If PA is ignoring your USB headset, you should be able to use it directly
in Blink by selecting it in the devices drop-down menus, no?  I don't know
that you'll need to go crazy with the loopback device.  In my case I need
it only because of the JACK involvement.

- Jeff

On Sat, May 11, 2019 at 8:15 AM juleg.ch at gmail.com <juleg.ch at gmail.com>

> Jeff,
> Thanks a lot for your reply.
> My problems occur while using a USB headset device.
> So I can imagine, that with the help of your asound.conf file as a
> template, I should be able to configure 2 alsa loopback devices for
> exclusiv use in Blink.
> As a temporary workaround for the moment, I disabled the USB audio via
> pavucontrol configuration altogether, so it is only seen and selected by
> Blink and doesn't pop up in PA at all while accepting or doing phone calls.
> Regards,
> Michael
> Date: Tue, 7 May 2019 11:07:17 -0400
> From: Jeff Pyle <jeff at ugnd.org> <jeff at ugnd.org>
> To: Blink Support Forum <blink at lists.ag-projects.com> <blink at lists.ag-projects.com>
> Subject: Re: [Blink] Blink for Linux hangs on second call when using
> 	PulseAudio input device
> Message-ID:
> 	<CAPhW+0KZhW+yzVrngDUeiN8bFMHpd6fRr2dpTUvCiyNNFz_fcg at mail.gmail.com> <CAPhW+0KZhW+yzVrngDUeiN8bFMHpd6fRr2dpTUvCiyNNFz_fcg at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
> Michael,
> My case is likely different, as my goal was to use a JACK-connected audio
> device in Blink.  JACK and PA play reasonably well together, but since PA
> and Blink don't sometimes, I created an ALSA loopback, integrated it into
> my JACK flow, and use it exclusively for connectivity with Blink.  I've
> attached my asound.conf.
> Once I have JACK started, I run a script called loop2jack, also attached.
> This creates two JACK devices, cloop and ploop, the "capture" loop and
> "playback" loop devices, respectively.  In Blink the devices appear as
> "Loopback, Loopback PCM" for input and output devices.  Blink does support
> JACK natively, but Blink's capture and playback connectors only appear when
> the audio device is actively in use.  I don't have any auto-patching
> mechanisms running in my JACK environment so this wasn't compatible.  I
> find the ALSA loopback approach very good for my needs.
> I also have trouble keeping the loopback PCM device playback level at 100%
> in alsamixer.  I haven't spent much time on it.
> All that said...  if you can configure Blink to use your audio device with
> ALSA directly, rather than PA, you should be okay, no?  PA will release it,
> and you won't have any of the Blink+PA problems we've seen.
> - Jeff
> On Sun, May 5, 2019 at 1:48 PM juleg.ch at gmail.com <juleg.ch at gmail.com> <juleg.ch at gmail.com>
> wrote:
> Hello
> It seams, that I'm experiencing the same problems here (Debian Stretch,
> Blink 3.2.0)
> After doing or receiving a call, Blink's cpu usage goes up to almost
> 100%. Also the application hangs afterward and I have to kill the
> process and start again to continue.
> PulseAudio shows a device "ALSA plug-in [python2.7]" in the recording
> section of pavucontrol which is not released until the killing of the
> process manually.
> Jeff, apparently you managed to find a workaround for this problem. I've
> read about ALSA-loopback devices under your posted linkhttps://alsa.opensrc.org/Jack_and_Loopback_device_as_Alsa-to-Jack_bridge
> but I have no clue how this could help bypassing PA and solving the
> problem in Blink. May be you could elaborate a little bit more how you
> installed this virtual device (example section of .asoundrc?) and what
> device one have to select in Blink for input/output? Can this
> workaround coexist with installed PA?
> Any help on this would be highly appreciated because I like the
> application a lot, especially because it's written in Python and it's
> possible for me to understand the source code an to do little
> adjustments if needed.
> Regards
> Michael
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