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import sys, os |
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from rsudp.raspberryshake import ConsumerThread |
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from rsudp import printM, printW, printE |
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from rsudp.test import TEST |
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import subprocess |
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try: |
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from pydub.playback import play, PLAYER |
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from pydub import AudioSegment |
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pydub_exists = True |
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TEST['d_pydub'][1] = True |
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except ImportError: |
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pydub_exists = False |
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class AlertSound(ConsumerThread): |
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""" |
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.. _pydub.AudioSegment: https://github.com/jiaaro/pydub/blob/master/API.markdown#audiosegment |
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A consumer class that plays an alert sound when an ``ALARM`` message arrives on the queue. |
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``rsudp.c_alertsound.AlertSound.sound`` is a pydub.AudioSegment_ object and is passed from the client. |
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:param sta: short term average (STA) duration in seconds. |
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:type sta: bool or pydub.AudioSegment_ |
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:param queue.Queue q: queue of data and messages sent by :class:`rsudp.c_consumer.Consumer`. |
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""" |
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def _load_sound(self): |
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''' |
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Loads MP3 sound if possible, then writes to wav. |
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Catches a ``FileNotFoundError`` when no player can be loaded. |
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''' |
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try: |
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soundloc = self.sound |
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self.sound = AudioSegment.from_file(self.sound, format="mp3") |
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printM('Loaded %.2f sec alert sound from %s' % (len(self.sound)/1000., soundloc), sender=self.sender) |
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self.wavloc = '%s.wav' % os.path.splitext(soundloc)[0] |
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if 'ffplay' in PLAYER: |
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self._write_wav() |
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except FileNotFoundError as e: |
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printE('Error loading player - %s' % (e), sender=self.sender) |
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printW("You have chosen to play a sound, but don't have ffmpeg or libav installed.", sender=self.sender) |
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printW('Sound playback requires one of these dependencies.', sender=self.sender, spaces=True) |
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printW("To install either dependency, follow the instructions at:", sender=self.sender, spaces=True) |
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printW('https://github.com/jiaaro/pydub#playback', sender=self.sender, spaces=True) |
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printW('The program will now continue without sound playback.', sender=self.sender, spaces=True) |
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self.sound = False |
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def _init_sound(self): |
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if pydub_exists: |
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if os.path.exists(self.sound): |
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self._load_sound() |
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else: |
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printW("The file %s could not be found." % (self.sound), sender=self.sender) |
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printW('The program will now continue without sound playback.', sender=self.sender, spaces=True) |
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self.sound = False |
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else: |
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printW("You don't have pydub installed, so no sound will play.", sender=self.sender) |
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printW('To install pydub, follow the instructions at:', sender=self.sender, spaces=True) |
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printW('https://github.com/jiaaro/pydub#installation', sender=self.sender, spaces=True) |
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printW('Sound playback also requires you to install either ffmpeg or libav.', sender=self.sender, spaces=True) |
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def _write_wav(self): |
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''' |
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FFPlay can only play raw wav sounds without verbosity, so to support |
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non-verbose mode we must export to .wav prior to playing a sound. |
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This function checks for an existing wav file and if it does not |
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exist, writes a new one. |
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''' |
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if not os.path.isfile(self.wavloc): |
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self.sound.export(self.wavloc, format="wav") |
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printM('Wrote wav version of sound file %s' % (self.wavloc), self.sender) |
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def __init__(self, testing=False, soundloc=False, q=False): |
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""" |
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.. _pydub.AudioSegment: https://github.com/jiaaro/pydub/blob/master/API.markdown#audiosegment |
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Initializes the alert sound listener thread. |
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Needs a pydub.AudioSegment_ to play and a :class:`queue.Queue` to listen on. |
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""" |
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super().__init__() |
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self.sender = 'AlertSound' |
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self.alive = True |
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self.testing = testing |
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self.sound = soundloc |
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self.devnull = open(os.devnull, 'w') |
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self._init_sound() |
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if q: |
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self.queue = q |
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else: |
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printE('no queue passed to the consumer thread! We will exit now!', |
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self.sender) |
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sys.stdout.flush() |
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self.alive = False |
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sys.exit() |
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printM('Starting.', self.sender) |
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def _play_quiet(self): |
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''' |
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if FFPlay is the player, suppress printed output. |
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''' |
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self._write_wav() |
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subprocess.call([PLAYER,"-nodisp", "-autoexit", "-hide_banner", |
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self.wavloc], stdout=self.devnull, stderr=self.devnull) |
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def _play(self): |
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printM('Playing alert sound...', sender=self.sender) |
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if 'ffplay' in PLAYER: |
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self._play_quiet() |
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else: |
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play(self.sound) |
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if self.testing: |
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TEST['c_play'][1] = True |
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def run(self): |
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""" |
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Reads data from the queue and plays self.sound if it sees an ``ALARM`` message. |
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Quits if it sees a ``TERM`` message. |
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""" |
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while True: |
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d = self.queue.get() |
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self.queue.task_done() |
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if 'TERM' in str(d): |
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self.alive = False |
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self.devnull.close() |
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printM('Exiting.', self.sender) |
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sys.exit() |
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elif 'ALARM' in str(d): |
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if self.sound and pydub_exists: |
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self._play() |
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raspishake /
rsudp
