Fadeouts and gain

events.py

@@ -16,7 +16,10 @@ class Event:
         self._at.set_timings(timings)
 
     def set_audiencecontent(self, audiencecontent):
-        self.audiencecontent = audiencecontent
+        self._audiencecontent = audiencecontent
+
+    def set_eventrunner(self, eventrunner):
+        self._eventrunner = eventrunner
 
     @property
     def scheduled(self):
@@ -39,6 +42,9 @@ class Event:
     def stop(self):
         pass
 
+    def notify(self, *args, **kwargs):
+        pass
+
 class Display(Event):
     def __init__(self, media, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -46,7 +52,7 @@ class Display(Event):
 
 
 class Playback(Event):
-    def __init__(self, media, device=None, channels=[1,2], tempo=None, beats=None, leadin=0, loop=False, *args, **kwargs):
+    def __init__(self, media, device=None, channels=[1,2], tempo=None, beats=None, leadin=0, loop=False, gain=0, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self._media = media
         self._device = device
@@ -57,6 +63,9 @@ class Playback(Event):
         self._beats = beats
         self._leadin = leadin
         self._loop = loop
+        self._gain = 10**(gain/10) # Convert from dB to linear gain
+        self._fadecurve = None
+        self._fadeframe = None
 
     def prepare(self):
         self._at._timings.register_tempo(self._tempo, self._beats, self._at)
@@ -68,11 +77,13 @@ class Playback(Event):
 
     def start(self):
         print("Start playback")
-        self._data, fs = soundfile.read(self._media)
+        self._data, self._fs = soundfile.read(self._media)
         self._current_frame = 0
+        self._fadecurve = None
+        self._fadeframe = None
 
         self._stream = sounddevice.OutputStream(
-            samplerate=fs, device=self._device, channels=self._channels,
+            samplerate=self._fs, device=self._device, channels=self._channels,
             callback=self.callback, finished_callback=self.finished_callback)
         self._stream.start()
 
@@ -80,7 +91,12 @@ class Playback(Event):
         if status:
             print(status)
         chunksize = min(len(self._data) - self._current_frame, frames)
-        outdata[:chunksize, self._mapping] = self._data[self._current_frame:self._current_frame + chunksize]
+        if self._fadecurve is not None:
+            chunksize = min(chunksize, len(self._fadecurve) - self._fadeframe)
+        outdata[:chunksize, self._mapping] = self._data[self._current_frame:self._current_frame + chunksize] * self._gain
+        if self._fadecurve is not None:
+            outdata[:chunksize, self._mapping] *= self._fadecurve[self._fadeframe:self._fadeframe + chunksize, np.newaxis]
+            self._fadeframe += chunksize
         if chunksize < frames:
             outdata[chunksize:, self._mapping] = 0
             raise sounddevice.CallbackStop()
@@ -88,7 +104,10 @@ class Playback(Event):
 
     def finished_callback(self):
         self._data = None
+        self._fadecurve = None
+        self._fadeframe = None
         print("Playback finished")
+        self._eventrunner.finished(self)
 
     def stop(self):
         print("Stop playback")
@@ -96,6 +115,22 @@ class Playback(Event):
         self._stream.close(True)
         self._stream = None
 
+    def notify(self, message, fadetime=10, db=30, *args, **kwargs):
+        if message == 'fadeout':
+            self._fadecurve = np.logspace(0, -db/10, fadetime * self._fs)
+            self._fadeframe = 0
+
+class FadeOut(Event):
+    def __init__(self, duration=10, db=30, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self._duration = duration
+        self._db = db
+
+    def start(self):
+        print("Fading out")
+        self._eventrunner.notify('fadeout', fadetime=self._duration, db=self._db)
+        self._eventrunner.finished(self)
+
 class SetTempo(Event):
     def __init__(self, tempo=None, beats=None, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -106,7 +141,7 @@ class SetTempo(Event):
         self._at._timings.register_tempo(self._tempo, self._beats, self._at)
 
     def start(self):
-        pass
+        self._eventrunner.finished(self)
 
     def stop(self):
         pass
@@ -120,7 +155,7 @@ class SetMark(Event):
         self._at._timings.register_mark(self._name, self._at)
 
     def start(self):
-        pass
+        self._eventrunner.finished(self)
 
     def stop(self):
         pass
@@ -134,7 +169,7 @@ class ButtonMark(Event):
         self._at._timings.register_mark(self._name, None)
 
     def start(self):
-        pass
+        self._eventrunner.finished(self)
 
     def stop(self):
         pass
@@ -146,10 +181,15 @@ class Lyrics(Event):
         self._duration = duration
 
     def start(self):
-        self.audiencecontent.new_content(display.DisplayLyrics(self._text))
+        self._audiencecontent.new_content(display.DisplayLyrics(self._text))
         print("Started displaying lyrics")
         print(self._text)
 
     def stop(self):
-        self.audiencecontent.new_content(display.DisplayContent())
+        self._audiencecontent.new_content(display.DisplayContent())
         print("Stopped displaying lyrics")
+
+    def notify(self, message, *args, **kwargs):
+        if message == 'newdisplay':
+            self._eventrunner.finished(self)
+

gig.py

@@ -24,6 +24,8 @@ class EventRunner:
         self._playing = None
         self._active = []
         self._currentitem = None
+        for item in self._gigconfig['items']:
+            self._gigconfig['items'][item].set_eventrunner(self)
 
     def set_audiencecontent(self, audiencecontent):
         for item in self._gigconfig['items']:
@@ -75,7 +77,8 @@ class EventRunner:
         self._playing = None
         self._selected = None
         for event in self._active:
-            event.stop()
+            if event is not None:
+                event.stop()
         self._active = []
         if self._currentitem is not None:
             self._currentitem.reset()
@@ -84,6 +87,17 @@ class EventRunner:
         event.start()
         self._active.append(event)
 
+    def notify(self, *args, **kwargs):
+        for event in self._active:
+            if event is not None:
+                event.notify(*args, **kwargs)
+
+    def finished(self, event):
+        # We might get called back here from within a notify or other such construct
+        for i, e in enumerate(self._active):
+            if e is event:
+                self._active[i] = None
+
     def pause(self):
         pass
 

item.py

@@ -51,3 +51,7 @@ class Item:
     def set_audiencecontent(self, audiencecontent):
         for event in self._events:
             event.set_audiencecontent(audiencecontent)
+
+    def set_eventrunner(self, eventrunner):
+        for event in self._events:
+            event.set_eventrunner(eventrunner)