Programming Voice Interfaces by Walter Quesada & Bob Lautenbach

Author:Walter Quesada & Bob Lautenbach
Language: eng
Format: epub
Publisher: O'Reilly Media, Inc.
Published: 2017-10-11T04:00:00+00:00

def trigger_process(trigger): if player.is_playing(): player.stop() # clean up the temp directory if not debug: for some_file in os.listdir(tmp_path): file_path = os.path.join(tmp_path, some_file) try: if os.path.isfile(file_path): os.remove(file_path) except Exception as exp: logger.warning(exp) if event_commands['pre_interaction']: subprocess.Popen(event_commands['pre_interaction'], shell=True, stdout=subprocess.PIPE) force_record = None if trigger.event_type in triggers.types_continuous: force_record = (trigger.continuous_callback, trigger.event_type in triggers.types_vad) if trigger.voice_confirm: player.play_speech(resources_path + 'alexayes.mp3') audio_stream = capture.silence_listener(force_record=force_record) alexa_speech_recognizer(audio_stream) triggers.enable() if event_commands['post_interaction']: subprocess.Popen(event_commands['post_interaction'], shell=True, stdout=subprocess.PIPE)

The trigger_process function starts off with stopping the audio player then goes into cleaning up the /temp directory, which includes files like previously recorded audio, for example. Interestingly, the subsequent line is a conditional statement to see if there’s a pre_interaction event command specified. Additionally, at the bottom of the function, there’s a condition to check for post_interaction. If there is, it will execute it on a subprocess, which is a cool way to set up your own routine to run before and/or after the callback trigger executes.

The lines in between the pre_interaction and post_interaction conditions execute the trigger events, run a voice_confirm audio clip if the trigger is a voice confirmation, then listen for the audio from the microphone routing that same audio stream to the alexa_speech_recognizer function definition. This function essentially takes in an audio stream and prepares it for departure. Let’s break down the speech recognizer code for a bit:

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