[Discuss-gnuradio] GRC selector audio sink error

[Phelps Williams]

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?

-Phelps

selector_audio_failure.png
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freq_switch.grc
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