From 4598d10b2e76b22b099ada72a05f4efaab152f66 Mon Sep 17 00:00:00 2001
From: "Agatha V. Lovelace" <agatha@technogothic.net>
Date: Thu, 21 Dec 2023 22:42:29 +0100
Subject: [PATCH] Switch to new audio interface

---
 common/fragments/graphical/audio.nix   |  2 +-
 hosts/tears/hardware-configuration.nix | 65 ++++++++++++--------------
 2 files changed, 30 insertions(+), 37 deletions(-)

diff --git a/common/fragments/graphical/audio.nix b/common/fragments/graphical/audio.nix
index 7b47f84..000a163 100644
--- a/common/fragments/graphical/audio.nix
+++ b/common/fragments/graphical/audio.nix
@@ -21,7 +21,7 @@
     serviceConfig = {
       ExecStart = "${pkgs.noisetorch}/bin/noisetorch -i -s ${
           if config.networking.hostName == "tears" then
-            "UMC202HD_Left"
+            "US-4x4HR_ch0"
           else
             "alsa_input.pci-0000_00_1f.3.analog-stereo"
         }";
diff --git a/hosts/tears/hardware-configuration.nix b/hosts/tears/hardware-configuration.nix
index da73b56..64c8927 100644
--- a/hosts/tears/hardware-configuration.nix
+++ b/hosts/tears/hardware-configuration.nix
@@ -54,43 +54,36 @@
   hardware.cpu.amd.updateMicrocode =
     lib.mkDefault config.hardware.enableRedistributableFirmware;
 
-  # Workaround for UMC202HD only exposing a single stereo input
-  environment.etc."pipewire/pipewire.conf.d/91-umc202hd.conf".text = ''
+  # Creating separate mono sources for Tascam US-4x4HR
+  environment.etc."pipewire/pipewire.conf.d/91-us-4x4hr.conf".text = let
+    name = "US-4x4HR";
+    target = "alsa_input.usb-TASCAM_US-4x4HR_no_serial_number-00.pro-input-0";
+    input = ch: ''
+      {   
+        name = libpipewire-module-loopback
+        args = {
+          node.description = "${name} Input ${toString ch} Mono"
+          capture.props = {
+            node.name = "capture.${name}_ch${toString ch}"
+            audio.position = [ AUX${toString ch} ]
+            stream.dont-remix = true
+            target.object = "${target}"
+            node.passive = true
+          }
+          playback.props = {
+            node.name = "${name}_ch${toString ch}"
+            media.class = "Audio/Source"
+            audio.position = [ MONO ]
+          }
+        }
+      }    
+    '';
+  in ''
       context.modules = [
-        {   name = libpipewire-module-loopback
-            args = {
-                node.description = "UMC202HD Left Input Mono"
-                capture.props = {
-                    node.name = "capture.UMC202HD_Left"
-                    audio.position = [ AUX0 ]
-                    stream.dont-remix = true
-                    target.object = "alsa_input.usb-BEHRINGER_UMC202HD_192k-00.analog-stereo"
-                    node.passive = true
-                }
-                playback.props = {
-                    node.name = "UMC202HD_Left"
-                    media.class = "Audio/Source"
-                    audio.position = [ MONO ]
-                }
-            }
-        }
-        {   name = libpipewire-module-loopback
-            args = {
-                node.description = "UMC202HD Right Input Mono"
-                capture.props = {
-                    node.name = "capture.UMC_202HD_Right"
-                    audio.position = [ AUX1 ]
-                    stream.dont-remix = true
-                    target.object = "alsa_input.usb-BEHRINGER_UMC202HD_192k-00.analog-stereo"
-                    node.passive = true
-                }
-                playback.props = {
-                    node.name = "UMC202HD_Right"
-                    media.class = "Audio/Source"
-                    audio.position = [ MONO ]
-                }
-            }
-        }
+        ${input 0}
+        ${input 1}
+        ${input 2}
+        ${input 3}
     ]
   '';
 }