Re: [Discuss-gnuradio] Problem with valve and audio sink

[Marcus D. Leech]

try running the same fix with the static variable, this problem will show up even with simple setups because it's in the alsa audio source block.  even though the fix works i wouldn't recommend it for long term solution because it's a hack.  you can look into the FIXME section of the code to make a more permenant solution.

al

-----Original Message-----
From: Volker Schroer <address@hidden>
To: Discuss-gnuradio <address@hidden>
Sent: Mon, Dec 6, 2010 11:40 am
Subject: [Discuss-gnuradio] Problem with valve and audio sink

Hi all,

I get an runtime error, when switching a valve.

I saw a similar problem some months ago, but the setup was different.

My setup is quite easy:

A signal source ( cosine, float ) connected to a audio sink.
The same signal source is connected to a valve and the valve is 
connected to a scope sink.

The valve is switched by a checkbox.

Switching the valve leads to

audio_alsa_sink[hw:0,0]: snd_pcm_hw_params failed: File descriptor in 
bad state
terminate called after throwing an instance of 'std::runtime_error'
   what():  check topology failed on audio_alsa_sink(1) using ninputs=1, 
noutputs=0

I wonder how the valve affects the audio sink.

Any ideas ?

Thanks in advance

Volker

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Actually, I've been working on a good fix for this--it's been "in testing" for the last 30 days or so,
  I'll perhaps submit it to Tom R, and see where it goes from there.

-- 
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org