Re: [linux-audio-user] Assistance with splitting up stereo channels in ALSA is appreciated.

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Subject: Re: [linux-audio-user] Assistance with splitting up stereo channels in ALSA is appreciated.
From: Jack O'Quin (joq_AT_io.com)
Date: Mon Apr 26 2004 - 19:16:57 EEST

Malcolm Baldridge <linux-audio_AT_paypc.com> writes:

> This brings me to my question. It turns out that I should be sending a
> "beep" down the lines I am monitoring to notify the parties that they are
> being recorded. I have a spare output channel [the R channel of the main
> PCM device]. The L channel is providing music-on-hold, remember, via mpg123
> which is using the ALSA driver.
>
> How can I configure ALSA (via asoundrc?) to split the PCM device into two
> independently accessible components for the L and R channels? I'm very
> pleased with mpg123 and do not feel I need to reinvent any wheels on that
> side. I don't feel it necessary to give Jack more to do, so I'd like to
> stay out of Jack if possible. (I run jackd with "jackd -R -d alsa -S -C -p
> 4096 -M -n 2 -r 11025").

Don't know about ALSA, but sending beeps through JACK should be
trivial. You could probably hack the jack_metro example client to do
that in just a few minutes. 

-- 
  joq

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