73879c6a99
Ensure nothing interrupts the stop - release - nullify sequence. Also don't limit how many concurrent fades there can be.
173 lines
4.3 KiB
Python
173 lines
4.3 KiB
Python
import os
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import threading
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import vlc
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from config import Config
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from datetime import datetime
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from time import sleep
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from log import DEBUG, ERROR
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lock = threading.Lock()
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class Music:
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"""
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Manage the playing of music tracks
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"""
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def __init__(self):
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self.current_track_start_time = None
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self.fading = 0
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self.VLC = vlc.Instance()
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self.player = None
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self.track_path = None
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self.max_volume = Config.VOLUME_VLC_DEFAULT
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def fade(self):
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"""
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Fade the currently playing track.
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The actual management of fading runs in its own thread so as not
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to hold up the UI during the fade.
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"""
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with lock:
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DEBUG("music.fade()", True)
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if not self.player:
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return
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if not self.player.get_position() > 0 and self.player.is_playing():
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return
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self.fading += 1
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thread = threading.Thread(target=self._fade)
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thread.start()
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def _fade(self):
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"""
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Implementation of fading the current track in a separate thread.
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"""
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# Take a copy of current player to allow another track to be
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# started without interfering here
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p = self.player
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DEBUG(f"music._fade(), {self.player=}", True)
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fade_time = Config.FADE_TIME / 1000
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steps = Config.FADE_STEPS
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sleep_time = fade_time / steps
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# We reduce volume by one mesure first, then by two measures,
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# then three, and so on.
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# The sum of the arithmetic sequence 1, 2, 3, ..n is
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# (n**2 + n) / 2
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total_measures_count = (steps**2 + steps) / 2
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measures_to_reduce_by = 0
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for i in range(1, steps + 1):
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measures_to_reduce_by += i
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volume_factor = 1 - (
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measures_to_reduce_by / total_measures_count)
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p.audio_set_volume(int(self.max_volume * volume_factor))
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sleep(sleep_time)
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self.stop(p)
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self.fading -= 1
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def get_playtime(self):
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"Return elapsed play time"
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with lock:
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if not self.player:
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return None
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return self.player.get_time()
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def get_position(self):
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"Return current position"
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with lock:
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DEBUG("music.get_position", True)
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return self.player.get_position()
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def play(self, path):
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"""
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Start playing the track at path.
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Log and return if path not found.
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"""
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if not os.access(path, os.R_OK):
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ERROR(f"play({path}): path not found")
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return
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self.track_path = path
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self.player = self.VLC.media_player_new(path)
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self.player.audio_set_volume(self.max_volume)
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DEBUG(f"music.play({path=}), {self.player}", True)
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self.player.play()
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self.current_track_start_time = datetime.now()
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def playing(self):
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"""
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Return True if currently playing a track, else False
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vlc.is_playing() returns True if track was faded out.
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get_position seems more reliable.
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"""
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with lock:
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if self.player:
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if self.player.get_position() > 0 and self.player.is_playing():
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return True
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# We take a copy of the player when fading, so we could be
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# playing in a fade nowFalse
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return self.fading > 0
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def set_position(self, ms):
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"Set current play time in milliseconds from start"
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with lock:
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return self.player.set_time(ms)
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def set_volume(self, volume):
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"Set maximum volume used for player"
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with lock:
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if not self.player:
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return
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self.max_volume = volume
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self.player.audio_set_volume(volume)
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def stop(self, player=None):
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"Immediately stop playing"
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with lock:
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DEBUG(f"music.stop(), {player=}", True)
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if not player:
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if not self.player:
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return
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player = self.player
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DEBUG(f"music.stop({player=})")
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position = player.get_position()
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player.stop()
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DEBUG(f"Releasing player {player=}", True)
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player.release()
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# Ensure we don't reference player after release
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player = None
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return position
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