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Re: [Discuss-gnuradio] GRC selector audio sink error


From: Alexandru Csete
Subject: Re: [Discuss-gnuradio] GRC selector audio sink error
Date: Thu, 6 Jan 2011 11:16:27 +0100

On Thu, Jan 6, 2011 at 6:51 AM, Phelps Williams <address@hidden> wrote:
> I put together a simple example of a selector which is controlled by a
> variable chooser to toggle between two different frequencies.  These two
> frequencies are dumped to an audio sink.  This example works fine (and I
> hear the default tone) until the selector input index is changed at which
> point the following error is observed:
> 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
> Does anybody have an idea what is going on here?

Hi Phelps,

This should be fixed in the git repository since Dec 2010.
For the longer answer with explanation, patch, etc. see the mailing
list from nov/dec last year.

Alex



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