added tap tempo input for fixed length mode

data_centre/length_setter.py

@@ -0,0 +1,22 @@
+import datetime
+
+class FixedLengthSetter(object):
+    DELTA_NUMBER = 2 
+
+    def __init__(self, data):
+        self.data = data
+
+        self.last_time = None
+        self.list_of_deltas = []
+    
+    def record_input(self):
+        if self.last_time == None:
+            self.last_time = datetime.datetime.now()
+        else:
+            now_time = datetime.datetime.now()
+            self.list_of_deltas.append(now_time - self.last_time)
+            self.last_time = now_time
+            if len(self.list_of_deltas) > self.DELTA_NUMBER:
+                average_delta = sum(self.list_of_deltas[-self.DELTA_NUMBER+1:], datetime.timedelta(0))/float(self.DELTA_NUMBER)
+                average_seconds = round(average_delta.total_seconds(), 2)
+                self.data.update_setting_value('sampler', 'FIXED_LENGTH', average_seconds)