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-rw-r--r--users/tazjin/nsfv-setup/default.nix18
1 files changed, 18 insertions, 0 deletions
diff --git a/users/tazjin/nsfv-setup/default.nix b/users/tazjin/nsfv-setup/default.nix
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+++ b/users/tazjin/nsfv-setup/default.nix
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+# Configures a running Pulseaudio instance with an LADSP filter that
+# creates a noise-cancelling sink.
+#
+# This can be used to, for example, cancel noise from an incoming
+# video conferencing audio stream.
+#
+# There are some caveats, for example this will not distinguish
+# between noise from different participants and I have no idea what
+# happens if the default sink goes away.
+{ pkgs, ... }:
+
+let
+  inherit (pkgs) ripgrep pulseaudio nsfv;
+in pkgs.writeShellScriptBin "nsfv-setup" ''
+  SINK=$(${pulseaudio}/bin/pacmd info | ${ripgrep}/bin/rg -r '$1' '^Default sink name: (.*)$')
+  echo "Setting up NSFV filtering to sink ''${SINK}"
+  ${pulseaudio}/bin/pacmd load-module module-ladspa-sink sink_name=NSFV sink_master=''${SINK} label=noise_suppressor_stereo plugin=${pkgs.nsfv}/lib/ladspa/librnnoise_ladspa.so control=50
+''