[pulseaudio-discuss] Low latency audio in-out application

[Pierre-Louis Bossart]

> Too bad. Using PA is convenient, as it's already integrated into most
> distros. And I am apparently misinterpreting the PA claim "Good low
> latency behaviour" -- but I guess that this depending on the definition
> of low latency...
>
> Dedicated box means that this PC is a prototype for some real-world HW
> DSP device which the software will later be moved to. Working on a linux
> application clearly helps development, debugging and observability.
>
> Perhaps it's best to approach ALSA directly for the lowest latency. Have
> I understood it correctly that PA emulates ALSA, so I need to disable PA
> for that particular sound device before I can access it directly?

You can reach 40ms of latency by inserting your filter in the PulseAudio 
real-time threads. You can look at loopback and virtual sinks/sources 
for examples.
-Pierre