Re: ALSAPulseAudio procedure

Hi Cinaed,

Thank you for your response. Yes, I have tried those and the
"hw:CARD=Generic,DEV=0" works well for most flowgraphs. I obtained that
from the 'aplay -L' command.

Let me reiterate my request: In exploring the audio problems, I followed
the instructions in
https://wiki.gnuradio.org/index.php/ALSAPulseAudio#Monitoring_the_output_of_your_system
and it gave the error I cited. So what I want to know is: Did I do
something wrong, or is the procedure not correct?

I need someone who is familiar with the ALSA and PulseAudio software to
look at this.

Thanks.
--
Barry Duggan KV4FV

On Tue, 30 Jun 2020 00:22:02 -0700, Cinaed Simson wrote:

What does

aplay -l

indicate?

When using

hw:CARD=Generic,DEV=0

in gnuradio, try using numbers, for example,

hw:0,0

or

plughw:0,0

and see if it makes a difference.

Or try switching between sampling rates of 48000 and 44100.

-- CInaed

On 6/29/20 3:00 PM, Barry Duggan wrote:

I have been having problems with audio underruns on some of my
flowgraphs, so I decided to try the procedure in
https://wiki.gnuradio.org/index.php/ALSAPulseAudio#Solution_2


I found one entry (other than HDMI) for my speakers and created the
following for ~/.asoundrc :

pcm.pulse_monitor {
type pulse
device alsa_output.pci-0000_0f_00.4.analog-stereo.monitor
}

ctl.pulse_monitor {
type pulse
device alsa_output.pci-0000_0f_00.4.analog-stereo.monitor
}

I changed my Audio Sink device name to 'pulse_monitor' and got the
following error: ALSA lib pcm_pulse.c:752:(pulse_prepare) PulseAudio:
Unable to create stream: No such entity


gr::log :ERROR: audio_alsa_sink0 - [pulse_monitor]:
snd_pcm_hw_params failed: Input/output error

Traceback (most recent call last):
File "/home/barry/GRdev/Pluto_NFM.py", line 216, in <module>
main()
File "/home/barry/GRdev/Pluto_NFM.py", line 194, in main
tb.start()

File
"/usr/local/lib/python3/dist-packages/gnuradio/gr/top_block.py", line
111, in start

top_block_start_unlocked(self._impl, max_noutput_items)

File
"/usr/local/lib/python3/dist-packages/gnuradio/gr/runtime_swig.py", line
5828, in top_block_start_unlocked

return _runtime_swig.top_block_start_unlocked(r, max_noutput_items)

RuntimeError: check topology failed on audio_alsa_sink(9) using
ninputs=1, noutputs=0


Using the device name "hw:CARD=Generic,DEV=0" works, but gives the
underruns. I'm using Ubuntu 19.10.


Any ideas?
Thanks.