feat: stream audio to CB

Uses PyAudio and ZeroMQ to publish audio chunks.

ref: N25B-119

main.py

@@ -1,27 +1,51 @@
 import qi
 import zmq
-import time
+
+from src.audio_streaming import AudioStreaming
+from state import state
 
 
 def say(session, message):
     tts = session.service("ALTextToSpeech")
     tts.say(message)
 
-if __name__ == "__main__":
-    app = qi.Application()
-    app.start()
-    session = app.session
 
+def listen_for_messages(session):
     context = zmq.Context()
     socket = context.socket(zmq.SUB)
     socket.connect("tcp://localhost:5556")
-    socket.setsockopt_string(zmq.SUBSCRIBE, u"") # u because Python 2 shenanigans
+    socket.setsockopt_string(zmq.SUBSCRIBE, u"")  # u because Python 2 shenanigans
 
-    while True:
-        print("Listening for message")
+    poller = zmq.Poller()
+    poller.register(socket, zmq.POLLIN)
+
+    print("Listening for messages")
+    while not state.exit_event.is_set():
+        if not poller.poll(200): continue  # At most 200 ms delay after CTRL+C
+        # We now know there's a message waiting for us
         message = socket.recv_string()
         print("Received message: {}".format(message))
 
-        say(session, message)
+        if session: say(session, message)
 
-        time.sleep(1)
+
+def main():
+    try:
+        app = qi.Application()
+        app.start()
+        session = app.session
+    except RuntimeError:
+        session = None
+
+    audio_streamer = AudioStreaming()
+    audio_streamer.run()
+
+    listen_for_messages(session)  # Runs indefinitely, until CTRL+C
+
+
+if __name__ == "__main__":
+    try:
+        state.initialize()
+        main()
+    finally:
+        state.deinitialize()