[ecasound] ALSA loopback API (was: Re: WHAT! ECASOUND BLOCKS ON NO INPUT)

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Subject: [ecasound] ALSA loopback API (was: Re: WHAT! ECASOUND BLOCKS ON NO INPUT)
From: Kai Vehmanen (k@eca.cx)
Date: Mon May 01 2000 - 20:09:21 EEST

On Wed, 26 Apr 2000, Jeremy Hall wrote:

> I am having trouble understanding the alsa loopback device. How does it
> work, and where in this massive amount of documentation from alsa may I
> find it?

Well, as ALSA is a rapidly developing project, documentation is always a
bit incomplete. In other words, there are not good docs about the
loopback-API. Luckily it's quite a simple design - it's mechanism to
capture output or input from dsp-devices (emulated-OSS or native-ALSA).
Here's a simple example (dsp1 is a ALSA dummy-device):

--cut--
|$ play -d /dev/dsp1 /empty1/track04.wav &
[1] 9485
|$ ecasound -i alsalb,1,0 -o alsa,0,0
--cut-- 

-- 
Kai Vehmanen <k@eca.cx> ---------------- CS, University of Turku .
 . audio software for linux ...	http://www.eca.cx 		 .
 . armchair-tunes mp3/wav/ra .. http://www.wakkanet.fi/sculpcave .

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