[alsa-devel] need help with io plugin programming: how to add delay ?

Alex Austin circuitsoft.alex at gmail.com
Wed Dec 23 10:28:15 CET 2009

The simplest solution would probably be completely userspace. Write a jackd
client which connects to the UART, gives itself RT priority using
capabilities, and exposes however many input/output ports as you have.
Google FFADO for an example of the programming model used.

If you need normal apps to drive into it, set up an .asoundrc with a device
using the jack plugin. I still don't see why you need a kernel driver at

On Wed, Dec 23, 2009 at 2:15 AM, Stefan Schoenleitner <
dev.c0debabe at gmail.com> wrote:

> Alex Austin wrote:
> > Do you really need a socket, or are you just trying to move audio data
> > from one app to another? Check out jack and netjack. They may already
> > provide the functionality you need.
> I need to move PCM samples to/from alsa from/to a DSP board.
> As the DSP board uses a serial interface (UART) it would be rather
> cumbersome to implement this functionality as kernel driver.
> My solution should be a little bit similar to bluetooth audio as it also
> uses an alsa io plugin and a daemon that actually talks to different
> (hardware-) devices.
> cheers,
> stefan

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