[pulseaudio-discuss] module-remap-source, module-virtual-source, and latencies

[Chase Lambert]

Hi,

I'm trying to make a low latency Virtual microphone. What that means is I
make a null sink, and then a module-virtual-source or module-remap-source
that has a master pointing to the sink's monitor.

Then I can write to that sink, and get data to show up in this virtual
microphone.

I've found that module-remap-source has a lower latency
than module-virtual-source, (~400ms lower it seems), but I don't have any
idea why. And more generally -- what is the difference between these two
modules? I looked at their source and also the git history, but that didn't
clear much up for me.

Also, is this the best way to make a low latency microphone? I have an
application that I want to send data to Chrome, with as low latency as
possible. Chrome operates directly with pulseaudio[0].

Thanks,
Chase

[0]
https://source.chromium.org/chromium/chromium/src/+/main:media/audio/pulse/audio_manager_pulse.cc
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