Auto-stop/start aloop daemon on jack freewheel

src/cadence_aloop_daemon.py

@@ -82,15 +82,9 @@ def sample_rate_callback(newSampleRate, arg):
 # listen to jack2 master switch
 
 def client_registration_callback(clientName, register, arg):
-    if clientName == b"system" and register:
-        print("NOTICE: Possible JACK2 master switch")
-        global bufferSize, sampleRate, doRunNow
-        bufferSize = jacklib.get_buffer_size(client)
-        sampleRate = jacklib.get_sample_rate(client)
-        doRunNow   = True
-
-    elif clientName in (b"alsa2jack", b"jack2alsa") and not register:
-        global doLoop, reactivateCounter, useZita
+    global doLoop, doRunNow, reactivateCounter, useZita
+
+    if clientName in (b"alsa2jack", b"jack2alsa") and not register:
         if doRunNow or not doLoop:
             return
 
@@ -102,6 +96,25 @@ def client_registration_callback(clientName, register, arg):
             doLoop = False
             print("NOTICE: %s has been stopped, quitting now..." % ("zita-a2j/j2a" if useZita else "alsa_in/out"))
 
+# --------------------------------------------------
+# listen to jack freewheel
+
+def freewheel_callback(isFreewheel, arg):
+    global doRunNow, procIn, procOut
+
+    if not isFreewheel:
+        # resume normal operation
+        doRunNow = True
+        return
+
+    # stop daemon for freewheel access
+    if procIn.state() != QProcess.NotRunning:
+        procIn.terminate()
+        procIn.waitForFinished(1000)
+    if procOut.state() != QProcess.NotRunning:
+        procOut.terminate()
+        procOut.waitForFinished(1000)
+
 # --------------------------------------------------
 # listen to jack shutdown
 
@@ -171,6 +184,7 @@ if __name__ == '__main__':
 
     jacklib.set_buffer_size_callback(client, buffer_size_callback, None)
     jacklib.set_sample_rate_callback(client, sample_rate_callback, None)
+    jacklib.set_freewheel_callback(client, freewheel_callback, None)
     jacklib.on_shutdown(client, shutdown_callback, None)
     jacklib.activate(client)