Google AIY Internet Radio

#!/usr/bin/env python3
# Copyright 2017 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Run a recognizer using the Google Assistant Library.

The Google Assistant Library has direct access to the audio API, so this Python
code doesn't need to record audio. Hot word detection "OK, Google" is supported.

It is available for Raspberry Pi 2/3 only; Pi Zero is not supported.
"""

import logging
import platform
import sys
import time
import aiy.assistant.auth_helpers
from aiy.assistant.library import Assistant
import aiy.audio
import aiy.voicehat
from google.assistant.library.event import EventType
import requests
import subprocess

import vlc
global vlc_volume
vlc_volume = 35

logging.basicConfig(
    level=logging.INFO,
    format="[%(asctime)s] %(levelname)s:%(name)s:%(message)s"
)

def power_off_pi():
    aiy.audio.say('Good bye!', lang="en-US", volume=5, pitch=150)
    subprocess.call('sudo shutdown now', shell=True)

def reboot_pi():
    aiy.audio.say('See you in a bit!', lang="en-US", volume=5, pitch=150)
    subprocess.call('sudo reboot', shell=True)

def say_ip():
    ip_address = subprocess.check_output("hostname -I | cut -d' ' -f1", shell=True)
    aiy.audio.say('My IP address is %s' % ip_address.decode('utf-8'), lang="en-US", volume=5, pitch=150)

def radiostop():
    try:
        player.stop()
    except NameError as e:
        print("Radio isn't on!")

def radiovoldown():
    try:
        global vlc_volume
        vlc_volume = vlc_volume-10
        print("Radio Volume: %s ", vlc_volume)
        player.audio_set_volume(vlc_volume)
    except NameError as e:
        print("Radio Vol Down Failed")

def radiovolup():
    try:
        global vlc_volume
        vlc_volume = vlc_volume+10
        print("Radio Volume: %s ", vlc_volume)
        player.audio_set_volume(vlc_volume)
    except NameError as e:
        print("Radio Vol Up Failed")

def findstream(radiostream):
    streamlist = {
        'radio 1': 'http://a.files.bbci.co.uk/media/live/manifesto/audio/simulcast/hls/uk/sbr_high/ak/bbc_radio_one.m3u8',
        'radio one': 'http://a.files.bbci.co.uk/media/live/manifesto/audio/simulcast/hls/uk/sbr_high/ak/bbc_radio_one.m3u8',
        'planet rock': 'http://icy-e-bz-08-boh.sharp-stream.com/planetrock.mp3',
        'talk sport': 'http://radio.talksport.com/stream?awparams=platform:ts-tunein;lang:en',
        'talksport': 'http://radio.talksport.com/stream?awparams=platform:ts-tunein;lang:en'
                }
    return streamlist[radiostream]

def radioplay(text):
    print("Radio Staion Requested: %s ", text)
    radiostream = (text.replace('play', '', 1)).strip()
    print("Radio Volume: %s ", vlc_volume)
    try:
        stream = findstream(radiostream)
    except KeyError as e:
        logging.error("Error finding stream")
        radiostop()
        return
    print("Playing radio: %s ", stream)
    instance = vlc.Instance()
    global player
    player = instance.media_player_new()
    media = instance.media_new(stream)
    player.set_media(media)
    player.audio_set_volume(vlc_volume)
    player.play()

def process_event(assistant, event):
    status_ui = aiy.voicehat.get_status_ui()
    if event.type == EventType.ON_START_FINISHED:
        status_ui.status('ready')
        if sys.stdout.isatty():
            print('Say "OK, Google" then speak, or press Ctrl+C to quit...')

    elif event.type == EventType.ON_CONVERSATION_TURN_STARTED:
        status_ui.status('listening')
        

    elif event.type == EventType.ON_RECOGNIZING_SPEECH_FINISHED and event.args:
        print('You said:', event.args['text'])
        text = event.args['text'].lower()
        if text == 'power off':
            assistant.stop_conversation()
            power_off_pi()
        elif 'play' in text:
            assistant.stop_conversation()
            radioplay(text)
        elif text == 'radio off':
            assistant.stop_conversation()
            radiostop()
        elif text == 'radio volume down':
            assistant.stop_conversation()
            radiovoldown()
        elif text == 'radio volume up':
            assistant.stop_conversation()
            radiovolup()    
        elif text == 'reboot':
            assistant.stop_conversation()
            reboot_pi()
        elif text == 'ip address':
            assistant.stop_conversation()
            say_ip()

    elif event.type == EventType.ON_END_OF_UTTERANCE:
        status_ui.status('thinking')

    elif (event.type == EventType.ON_CONVERSATION_TURN_FINISHED
          or event.type == EventType.ON_CONVERSATION_TURN_TIMEOUT
          or event.type == EventType.ON_NO_RESPONSE):
        status_ui.status('ready')

    elif event.type == EventType.ON_ASSISTANT_ERROR and event.args and event.args['is_fatal']:
        sys.exit(1)

def _on_button_pressed():
    radiostop()

def main():
    if platform.machine() == 'armv6l':
        print('Cannot run hotword demo on Pi Zero!')
        exit(-1)

    credentials = aiy.assistant.auth_helpers.get_assistant_credentials()
    with Assistant(credentials) as assistant:
        aiy.voicehat.get_button().on_press(_on_button_pressed)
        for event in assistant.start():
            process_event(assistant, event)


if __name__ == '__main__':
    main()