class StateMachine:
def __init__(self, wake_word_model):
self.__src = Source(rate=16000)
self.__ns = NS(rate=16000, channels=1)
self.__kws = KWS(model=wake_word_model)
self.__alexa = Alexa()
self.__src.link(self.__ns)
self.__ns.link(self.__kws)
self.__kws.link(self.__alexa)
self.__pixels = ThreePixels()
self.__button = Button()
self.__alexa.state_listener.on_listening = self.on_listening
self.__alexa.state_listener.on_thinking = self.on_thinking
self.__alexa.state_listener.on_speaking = self.on_speaking
self.__alexa.state_listener.on_finished = self.on_finished
def on_listening(self):
self.__pixels.wakeup()
def on_thinking(self):
self.__pixels.think()
def on_speaking(self):
self.__pixels.speak()
def on_finished(self):
self.__pixels.off()
def __on_detected(self, keyword):
print('detected {}'.format(keyword))
print('Alexa is listening!')
self.__alexa.listen()
def __pushed_button(self, channel):
print('button pushed')
print('Alexa is listening!')
self.__alexa.listen()
def start(self):
print('starting voice engine')
self.__kws.set_callback(self.__on_detected)
Button.set_callback_on_rising(self.__pushed_button)
self.__src.recursive_start()
def stop(self):
print('stopping voice engine')
self.__src.recursive_stop()
Button.clean_up()
self.__pixels.off()
class AssistantEchoPlugin(AssistantPlugin):
"""
Amazon Echo/Alexa assistant plugin.
In order to activate the Echo service on your device follow these steps:
1. Install avs (``pip install git+https://github.com/BlackLight/avs.git``)
2. Run the ``alexa-auth`` script. A local webservice will start on port 3000
3. If a browser instance doesn't open automatically then head to http://localhost:3000
4. Log in to your Amazon account
5. The required credentials will be stored to ~/.avs.json
Triggers:
* :class:`platypush.message.event.assistant.ConversationStartEvent`
when a new conversation starts
* :class:`platypush.message.event.assistant.SpeechRecognizedEvent`
when a new voice command is recognized
* :class:`platypush.message.event.assistant.ConversationEndEvent`
when a new conversation ends
Requires:
* **avs** (``pip install avs``)
"""
def __init__(self,
avs_config_file: str = None,
audio_device: str = 'default',
audio_player: str = 'default',
**kwargs):
"""
:param avs_config_file: AVS credentials file - default: ~/.avs.json. If the file doesn't exist then
an instance of the AVS authentication service will be spawned. You can login through an Amazon
account either in the spawned browser window, if available, or by opening http://your-ip:3000
in the browser on another machine.
:param audio_device: Name of the input audio device (default: 'default')
:param audio_player: Player to be used for audio playback (default: 'default').
Supported values: 'mpv', 'mpg123', 'gstreamer'
"""
from avs.alexa import Alexa
from avs.config import DEFAULT_CONFIG_FILE
from avs.mic import Audio
super().__init__(**kwargs)
if not avs_config_file:
avs_config_file = DEFAULT_CONFIG_FILE
if not avs_config_file or not os.path.isfile(avs_config_file):
from avs.auth import auth
auth(None, avs_config_file)
self.logger.warning(
'Amazon Echo assistant credentials not configured. Open http://localhost:3000 '
+ 'to authenticate this client')
self.audio_device = audio_device
self.audio_player = audio_player
self.audio = Audio(device_name=audio_device)
self.alexa = Alexa(avs_config_file, audio_player=audio_player)
self._ready = False
self.alexa.state_listener.on_ready = self._on_ready()
self.alexa.state_listener.on_listening = self._on_listening()
self.alexa.state_listener.on_speaking = self._on_speaking()
self.alexa.state_listener.on_thinking = self._on_thinking()
self.alexa.state_listener.on_finished = self._on_finished()
self.alexa.state_listener.on_disconnected = self._on_disconnected()
self.audio.link(self.alexa)
self.alexa.start()
def _on_ready(self):
def _callback():
self._ready = True
return _callback
def _on_listening(self):
def _callback():
get_bus().post(ConversationStartEvent(assistant=self))
return _callback
def _on_speaking(self):
def _callback():
# AVS doesn't provide a way to access the response text
get_bus().post(ResponseEvent(assistant=self, response_text=''))
return _callback
def _on_finished(self):
def _callback():
get_bus().post(ConversationEndEvent(assistant=self))
return _callback
def _on_disconnected(self):
def _callback():
self._ready = False
return _callback
def _on_thinking(self):
def _callback():
# AVS doesn't provide a way to access the detected text
get_bus().post(SpeechRecognizedEvent(assistant=self, phrase=''))
return _callback
@action
def start_conversation(self, **kwargs):
"""
Programmatically start a conversation with the assistant
"""
if not self._ready:
raise RuntimeError('Echo assistant not ready')
self.audio.start()
self.alexa.listen()
@action
def stop_conversation(self):
"""
Programmatically stop a running conversation with the assistant
"""
self.audio.stop()
self._on_finished()()