2020-09-30 03:42:59 +00:00
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# Configures a running Pulseaudio instance with an LADSP filter that
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# creates a noise-cancelling sink.
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#
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# This can be used to, for example, cancel noise from an incoming
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# video conferencing audio stream.
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#
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# There are some caveats, for example this will not distinguish
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# between noise from different participants and I have no idea what
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# happens if the default sink goes away.
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#
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# If this script is run while an NSFV sink exists, the existing sink
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# will first be removed.
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2022-05-19 14:39:52 +00:00
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{ depot, pkgs, ... }:
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2020-09-30 03:42:59 +00:00
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let
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2022-05-19 14:39:52 +00:00
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inherit (pkgs) ripgrep pulseaudio;
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inherit (depot.third_party) nsfv;
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in
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pkgs.writeShellScriptBin "nsfv-setup" ''
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2020-09-30 03:42:59 +00:00
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export PATH="${ripgrep}/bin:${pulseaudio}/bin:$PATH"
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if pacmd list-sinks | rg librnnoise_ladspa.so >/dev/null; then
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pactl unload-module module-ladspa-sink
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fi
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SINK=$(${pulseaudio}/bin/pacmd info | ${ripgrep}/bin/rg -r '$1' '^Default sink name: (.*)$')
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echo "Setting up NSFV filtering to sink ''${SINK}"
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2022-05-19 14:39:52 +00:00
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${pulseaudio}/bin/pacmd load-module module-ladspa-sink sink_name=NSFV sink_master=''${SINK} label=noise_suppressor_mono plugin=${nsfv}/lib/ladspa/librnnoise_ladspa.so control=42 rate=48000
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2020-09-30 03:42:59 +00:00
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''
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