156 lines
4.0 KiB
Python
156 lines
4.0 KiB
Python
# import os
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import threading
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import vlc
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#
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from config import Config
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from datetime import datetime
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from helpers import file_is_readable
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from typing import Optional
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from time import sleep
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from log import log
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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) -> None:
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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) -> None:
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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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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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thread = threading.Thread(target=self._fade)
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thread.start()
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def _fade(self) -> None:
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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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with lock:
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p = self.player
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self.player = None
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# Sanity check
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if not p:
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return
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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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with lock:
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p.stop()
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log.debug(f"Releasing player {p=}")
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p.release()
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def get_playtime(self) -> Optional[int]:
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"""Return elapsed play time"""
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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) -> Optional[float]:
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"""Return current position"""
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if not self.player:
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return None
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return self.player.get_position()
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def play(self, path: str,
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position: Optional[float] = None) -> Optional[int]:
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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 file_is_readable(path):
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log.error(f"play({path}): path not readable")
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return None
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status = -1
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self.track_path = path
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self.player = self.VLC.media_player_new(path)
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if self.player:
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self.player.audio_set_volume(self.max_volume)
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self.current_track_start_time = datetime.now()
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status = self.player.play()
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if position:
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self.player.set_position(position)
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return status
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#
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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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#
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# with lock:
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# return self.player.set_time(ms)
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#
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# def set_volume(self, volume, set_default=True):
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# """Set maximum volume used for player"""
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#
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# with lock:
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# if not self.player:
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# return
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#
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# if set_default:
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# self.max_volume = volume
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#
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# self.player.audio_set_volume(volume)
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def stop(self) -> float:
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"""Immediately stop playing"""
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with lock:
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if not self.player:
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return 0.0
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position = self.player.get_position()
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self.player.stop()
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self.player.release()
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# Ensure we don't reference player after release
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self.player = None
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return position
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