Re: [Discuss-gnuradio] ALSA audio source not working---why?

[Eric Blossom]

On Wed, May 25, 2005 at 11:45:11PM +0000, Henry Gernhardt III wrote:
> Folks---
> 
> I just successfuly compiled GnuRadio and its dependencies.  (YAY!!)  I 
> have, however, run into a slight snag with audio.source().  When running 
> anything using this little gem, I get the following (example output from 
> spectrum_inversion.py):
> 
> audio_alsa_source[hw:0,0]: set_channels failed: Invalid argument
> Traceback (most recent call last):
>  File "spectrum_inversion.py", line 37, in ?
>    main ()
>  File "spectrum_inversion.py", line 32, in main
>    fg.start ()
>  File 
> "/home/henry/gnuradio/lib/python2.4/site-packages/gnuradio/gr/flow_graph.py", 
> line 69, in start
>    self._setup_connections ()
>  File 
> "/home/henry/gnuradio/lib/python2.4/site-packages/gnuradio/gr/flow_graph.py", 
> line 98, in _setup_connections
>    self.validate ()
>  File 
> "/home/henry/gnuradio/lib/python2.4/site-packages/gnuradio/gr/basic_flow_graph.py",
>  
> line 164, in validate
>    raise ValueError, ("%s::check_topology (%d, %d) failed" % (m, ninputs, 
> noutputs))
> ValueError: <gr_block audio_alsa_source (0)>::check_topology (0, 1) failed
> 
> Any ideas as to what may be causing this?
> 
> TIA,
> 
>        Henry C. Gernhardt, III
>        KE4PIB

Buggy ALSA driver.

What kind of a audio card are you using?

Eric