fix pinning of 5.1 channel

README.md

@@ -40,6 +40,8 @@ After Arma has created its audio stream, restore your normal default device:
 reforger-surround restore
 ```
 
+`restore` first pins the running Arma stream to the 5.1 sink, then switches normal system audio back to the previous default device.
+
 Check whether Arma negotiated surround:
 
 ```bash
@@ -57,7 +59,8 @@ reforger-surround down
 ```bash
 reforger-surround create   # create the 5.1 sink without changing defaults
 reforger-surround up       # create the sink, save current default, make 5.1 default
-reforger-surround restore  # restore the saved previous default, keep 5.1 sink alive
+reforger-surround pin      # move a running Arma/Reforger stream to the 5.1 sink
+reforger-surround restore  # pin Reforger if running, then restore the saved previous default
 reforger-surround down     # restore previous default and unload the 5.1 sink
 reforger-surround status   # show sink/default/game stream state
 reforger-surround check    # report whether Arma is 2ch or 6ch
@@ -100,6 +103,7 @@ If Arma creates a stereo-only stream, restart the game with the 5.1 sink selecte
 ## Notes
 
 - `up` temporarily routes normal system audio to the 5.1 sink until `restore` is run.
-- `restore` does not unload the 5.1 sink; it only gives normal system audio back to the previous default.
+- `restore` does not unload the 5.1 sink; it pins Reforger if running, then gives normal system audio back to the previous default.
+- If Reforger follows the default sink when the default changes, run `reforger-surround pin` before switching devices manually.
 - `down` unloads the temporary sink created by this tool.
 - LFE may be silent in Arma Reforger even when the stream is 6ch.

reforger-surround

@@ -14,6 +14,7 @@ usage() {
 Usage:
   reforger-surround create
   reforger-surround up
+  reforger-surround pin
   reforger-surround restore
   reforger-surround down
   reforger-surround status
@@ -22,7 +23,8 @@ Usage:
 Commands:
   create   Create the temporary 5.1 sink without changing the default sink.
   up       Create the 5.1 sink, save the current default, and make it default.
-  restore  Restore the saved previous default sink, leaving the 5.1 sink alive.
+  pin      Move a running Reforger stream to the 5.1 sink.
+  restore  Pin Reforger if running, then restore the saved previous default sink.
   down     Restore the saved previous default sink and unload the 5.1 sink.
   status   Show default sink, virtual sink state, and detected Reforger stream.
   check    Report whether a running Reforger stream negotiated stereo or surround.
@@ -137,6 +139,44 @@ Launch Arma Reforger now. After the game has created its audio stream, run:
 EOF
 }
 
+move_app_to_sink() {
+  local input_id sample_spec
+  input_id="$(find_app_sink_input_id || true)"
+
+  if [[ -z "${input_id}" ]]; then
+    printf 'No running sink-input found for application.name="%s".\n' "${app_name}" >&2
+    return 1
+  fi
+
+  create_sink
+  sample_spec="$(app_stream_sample_spec "${input_id}")"
+  pactl move-sink-input "${input_id}" "${sink_name}"
+  printf 'Pinned %s sink-input #%s to %s\n' "${app_name}" "${input_id}" "${sink_name}"
+
+  case "${sample_spec}" in
+    *" 6ch "*)
+      printf 'Stream is 6ch; restoring the system default should leave Reforger on the 5.1 sink.\n'
+      ;;
+    *" 2ch "*)
+      printf 'Warning: stream is already stereo-only. Pinning will not make Reforger renegotiate surround.\n' >&2
+      ;;
+    *)
+      printf 'Warning: unknown stream channel count; run reforger-surround check.\n' >&2
+      ;;
+  esac
+}
+
+pin_app_if_running() {
+  local input_id
+  input_id="$(find_app_sink_input_id || true)"
+
+  if [[ -n "${input_id}" ]]; then
+    move_app_to_sink
+  else
+    printf 'No %s stream found to pin; restoring only the system default.\n' "${app_name}"
+  fi
+}
+
 restore_default() {
   local restore_sink
   restore_sink="$(sed -n '1p' "${previous_default_sink_file}" 2>/dev/null || true)"
@@ -155,6 +195,11 @@ restore_default() {
   printf 'Restored default sink: %s\n' "${restore_sink}"
 }
 
+restore_with_pin() {
+  pin_app_if_running
+  restore_default
+}
+
 unload_sink() {
   local module_id
   module_id="$(find_module_id || true)"
@@ -339,10 +384,15 @@ main() {
       require_pulse_connection
       up
       ;;
+    pin)
+      ensure_dependencies
+      require_pulse_connection
+      move_app_to_sink
+      ;;
     restore)
       ensure_dependencies
       require_pulse_connection
-      restore_default
+      restore_with_pin
       ;;
     down)
       ensure_dependencies