filter-chain: add FL to FL-FR duplication

src/daemon/filter-chain/duplicate-FL.conf

@@ -0,0 +1,48 @@
+# An example filter chain for duplicating the FL channel
+# to FL and FR.
+#
+# Copy this file into a conf.d/ directory
+#
+context.modules = [
+    { name = libpipewire-module-filter-chain
+        args = {
+            node.name        = "remap-FL-to-FL-FR"
+            node.description = "Remap example"
+            media.name       = "Remap example"
+            filter.graph = {
+                nodes = [
+                    {
+                        name   = copyIL
+                        type   = builtin
+                        label  = copy
+                    }
+                    {
+                        name   = copyOL
+                        type   = builtin
+                        label  = copy
+                    }
+                    {
+                        name   = copyOR
+                        type   = builtin
+                        label  = copy
+                    }
+                ]
+                links = [
+		    # we can only tee from nodes, not inputs so we need
+		    # to copy the inputs and then tee.
+                    { output = "copyIL:Out" input = "copyOL:In" }
+                    { output = "copyIL:Out" input = "copyOR:In" }
+                ]
+                inputs  = [ "copyIL:In" ]
+                outputs = [ "copyOL:Out" "copyOR:Out" ]
+            }
+            capture.props = {
+                audio.position  = [ FL ]
+                stream.dont-remix = true
+            }
+            playback.props = {
+                audio.position  = [ FL FR ]
+            }
+        }
+    }
+]

src/daemon/filter-chain/meson.build

@@ -1,5 +1,6 @@
 conf_files = [
   [ 'demonic.conf', 'demonic.conf' ],
+  [ 'duplicate-FL.conf', 'duplicate-FL.conf' ],
   [ 'sink-virtual-surround-5.1-kemar.conf', 'sink-virtual-surround-5.1-kemar.conf' ],
   [ 'sink-virtual-surround-7.1-hesuvi.conf', 'sink-virtual-surround-7.1-hesuvi.conf' ],
   [ 'sink-dolby-surround.conf', 'sink-dolby-surround.conf' ],