Re: [Discuss-gnuradio] unable to get sound from alsa sink

[Barry Duggan]

Hi Chris,

You might try 'pavucontrol' as suggested to me by Kyeong Su Shin. Since 
you are operating outside the GRC environment, it might help. Also, I 
would compare the Python code generated by GRC with your modified code 
to see areas which address the audio.

Good luck,
---
Barry Duggan


On 2019-08-26 10:30, Chris Gorman wrote:
> Hi Barry,
>
> Thanks for your time and expertise.  I should have been more verbose
> in my email.  I can get sound out of my code when I use the
> gnuradio-companion program, but not when I run the snippet I gave you.
> The purpose of the hacked code is to try to tie a 4x4 Qt.PushButton to
> the various frequencies needed to make a Touch tone generator.  (I
> currently have it working with radio buittons, through
> gnuraidio-companion, but want to use Qt.PushButtons instead.)  I tried
> your suggestion and can get the sound working, but not outside of grc.
>
> I am using gnuradio-companion 3.7.13.5 on ubuntu 18.04.  aplay -L
> gives me lots of options but the one that appears to be default is...
>
> sysdefault:CARD=Intel
>     HDA Intel, STAC9221 A1 Analog
>     Default Audio Device
>
> I'm wondering if this is a sound system permission issue?
>
> Thanks for your help.
>
> Chris
>
>
> Chris
>
> On Mon, Aug 26, 2019 at 9:36 AM Barry Duggan <address@hidden> wrote:
> > Hi Chris,
> >
> > You didn't mention your OS or your platform, but this works for a 
> > Linux
> > system:
> >
> > Using a terminal screen, enter 'aplay -L'
> >
> > Here is an excerpt from my Raspberry Pi:
> >
> > """
> > default:CARD=ALSA
> >      bcm2835 ALSA, bcm2835 ALSA
> >      Default Audio Device
> > hw:CARD=ALSA,DEV=1
> >      bcm2835 ALSA, bcm2835 IEC958/HDMI
> >      Direct hardware device without any conversions
> > hw:CARD=Device,DEV=0
> >      USB Audio Device, USB Audio
> >      Direct hardware device without any conversions
> > """
> >
> > The Pi has a headphone jack, an HDMI port, and I have a USB audio
> > dongle. What you need to do is pick the appropriate entry for your
> > system, and the enter the Device Name in the Audio Sink properties. 
> > For
> > example, I use "hw:CARD=ALSA,DEV=1" to get sound on my monitor.
> >
> > On Windows or Mac, you might just enter "default:CARD=ALSA".
> >
> > Good luck,
> > --
> > Barry Duggan
> >
> > On Sun, 25 Aug 2019 17:27:31 -0400, Chris Gorman wrote:
> >
> > Hello All,
> >
> > I have been hacking at a python script with an attempt to pass two
> > frequencies to be added to audio sink.  I can't seem to get any sound
> > out of the sound card, though.  When I run the script I get "gr::log
> > :INFO: audio source - Audio sink arch: alsa".  The script follows.  My
> > python and QT skills are very poor, I simply started with
> > gnuradio-companion code and tried to hack the result.  Can anyone see
> > where I might fix this?
> >
> > Thanks in advance.
> >
> > Chris
> >
> > <snip>