add alexa demo

util/aec_ns_kws_alexa.py

@@ -0,0 +1,55 @@
+"""
+Read audio from a file, and then search the keyword "snowboy"
+"""
+
+import sys
+import signal
+import time
+import logging
+
+from voice_engine.raw_file_source import Source
+from voice_engine.channel_picker import ChannelPicker
+from voice_engine.ns import NS
+from voice_engine.kws import KWS
+from avs.alexa import Alexa
+from pixels import pixels
+
+logging.basicConfig(level=logging.INFO)
+
+
+def main():
+    src = Source('/tmp/ec.output', rate=16000, channels=2)
+    ch0 = ChannelPicker(channels=src.channels, pick=1)
+    ns = NS()
+    kws = KWS(model='alexa', sensitivity=0.7)
+    alexa = Alexa()
+
+    src.pipeline(ch0, ns, kws, alexa)
+
+    def on_detected(keyword):
+        print('detected {}'.format(keyword))
+        alexa.listen()
+
+    kws.set_callback(on_detected)
+
+    alexa.state_listener.on_listening = pixels.listen
+    alexa.state_listener.on_thinking = pixels.think
+    alexa.state_listener.on_speaking = pixels.speak
+    alexa.state_listener.on_finished = pixels.off
+
+    src.pipeline_start()
+
+    is_quit = []
+    def signal_handler(sig, frame):
+        is_quit.append(True)
+        print('quit')
+    signal.signal(signal.SIGINT, signal_handler)
+
+    while src.is_active() and not is_quit:
+        time.sleep(1)
+
+    src.pipeline_stop()
+
+
+if __name__ == '__main__':
+    main()