Hey, everybody.
I am just starting to try GNUradio and I am facing some difficulties.
Maybe someone can comment and suggest a direction to find an answer to
my question.
I have GNUradio 3.10.9.2 installed on ArchLinux; in gnuradio-companion I
created a simple flowgraph: noise source -> throttle -> audio sink.
My problem is that if I specify as device name my device in audio sink,
the start of the flowgraph fails:
--------
File “/home/user/gnuradio/alsa1.py”, line 70, in __init__
self.audio_sink_0 = audio.sink(48000, 'k15', True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: audio_alsa_sink
--------
I'll clarify at this point that the name of the ALSA device, k15, is
defined in ~/.asoundrc and the device itself is a software audio
resampler implemented in the ALSA subsystem, that's how it's defined:
pcm.k15 {
type rate
slave {
pcm default
rate 48000
}
converter “samplerate_linear”
}
This device takes an audio stream, resamples it to 48000 and sends it to
the sound controller with a sampling rate of 48000 allowed for it.
This device works great when using different programs, like aplay, with
different sample rates and parameters, example:
aplay -D k15 -c 1 -r 10000 -f S32_LE /dev/urandom (sound mono, sample
rate 10000, format S32_LE).
But it doesn't work with GNUradio.
Can anyone suggest what could be the reason for the error of working
with this sound device ?
Another thing: if I compile the flowgraph into C++ and then into an
executable file, the error looks like this:
audio_alsa_sink :error: [k15]: set_periods failed: Invalid argument
Thank you.
