helpers/music_file.py

   1 import threading
   2 import pydub
   3 import pygame
   4 import math
   5
   6 class MusicFile:
   7     def __init__(self, filename, lock, channel_id, name = None, gain = 1):
   8         self.filename = filename
   9         self.channel_id = channel_id
  10         self.name = name or filename
  11         self.raw_data = None
  12         self.gain = gain
  13
  14         self.loaded = False
  15         self.flag_paused = False
  16         threading.Thread(name = "MSMusicLoad", target = self.load_sound, args = [lock]).start()
  17
  18     def load_sound(self, lock):
  19         lock.acquire()
  20         print("Loading « {} »".format(self.name))
  21         volume_factor = 20 * math.log10(self.gain)
  22         audio_segment = pydub.AudioSegment.from_file(self.filename).set_frame_rate(44100).apply_gain(volume_factor)
  23         self.sound_duration = audio_segment.duration_seconds
  24         self.raw_data = audio_segment.raw_data
  25         print("Loaded « {} »".format(self.name))
  26         self.loaded = True
  27         lock.release()
  28
  29     def is_playing(self):
  30         return self.channel().get_busy()
  31
  32     def is_paused(self):
  33         return self.flag_paused
  34
  35     def play(self, fade_in = 0, volume = 100, start_at = 0):
  36         self.channel().set_endevent()
  37         self.channel().set_endevent(pygame.USEREVENT)
  38         self.set_volume(volume)
  39
  40         if start_at > 0:
  41             raw_data_length = len(self.raw_data)
  42             start_offset = int((raw_data_length / self.sound_duration) * start_at)
  43             start_offset = start_offset - (start_offset % 2)
  44             sound = pygame.mixer.Sound(self.raw_data[start_offset:])
  45         else:
  46             sound = pygame.mixer.Sound(self.raw_data)
  47
  48         self.channel().play(sound, fade_ms = int(fade_in * 1000))
  49         self.flag_paused = False
  50
  51     def pause(self):
  52         self.channel().pause()
  53         self.flag_paused = True
  54
  55     def unpause(self):
  56         self.channel().unpause()
  57         self.flag_paused = False
  58
  59     def stop(self, fade_out = 0):
  60         if fade_out > 0:
  61             self.channel().fadeout(int(fade_out * 1000))
  62         else:
  63             self.channel().stop()
  64
  65     def set_volume(self, value):
  66         if value < 0:
  67             value = 0
  68         if value > 100:
  69             value = 100
  70         self.channel().set_volume(value / 100)
  71
  72     def wait_end(self):
  73         pass
  74
  75     def channel(self):
  76         return pygame.mixer.Channel(self.channel_id)