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Re: [Discuss-gnuradio] Delta 44

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Delta 44
Date: Fri, 27 May 2005 03:46:42 -0700
User-agent: Mutt/1.5.6i

On Fri, May 27, 2005 at 05:48:18AM -0600, Bob McGwier N4HY wrote:

> Even though the Delta 44 has only four inputs and four outputs (all
> balanced monoaural), it reports twelve through ALSA to jack.  I can
> tell this is happening since dial_tone.py and tvrx_wfm_rcv.py both
> blow up with complaints about the number of sinks.  multi_tone.py
> works perfectly since it loads stuff up for all gazoutas.
> Has anyone done a general work around for this?

Try using plughw:0,0 instead of hw:0,0 as the pcm device (second arg
to audio.source and audio.sink.  plughw:0,0 should send something (not
sure what) to all i/os.  Not sure of the performance impact.  A bit of
measuring with oprofile will reveal all.

It sounds like a fix for the Delta-44 ALSA driver is in order too.
This assumes that the driver can tell the difference between a
Delta-44 and other boards with the same chip set.

You might want to post this question to the JACK or ALSA mailing lists.


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