[alsa-devel] Custom Kernel driver to open and use another ALSA PCM

[Kai Vehmanen]

Hi,

On Wed, 2 Oct 2019, ed nwave wrote:

> A little bit of an unorthodox request but I need my custom PCM driver to
> connect directly to another PCM driver if possible. I have an application
[...]
> As an example, my PCM driver acts as a sound card connected to a microphone
> capture application, within the my custom PCM I've added various "dalek"
> and other voice changing alterations and now I need to output this stream

I have to ask why you are doing this in kernel? From performance and 
latency point of view, PCM processing should be in user-space (see e.g. 
JACK and Pulseaudio for old examples).

Br, Kai