Apply initial gain to music file

[perso/Immae/Projets/Python/MusicSampler.git] / helpers / music_file.py

diff --git a/helpers/music_file.py b/helpers/music_file.py
index cdc9836c19a299b82b2ba2fcca17495ea5f53cd9..892519d2e843be9423b98399aad37de6ce7060f4 100644 (file)
--- a/helpers/music_file.py
+++ b/helpers/music_file.py
@@ -1,14 +1,15 @@
 import threading
 import pydub
 import pygame
+import math
 
 class MusicFile:
-    def __init__(self, filename, lock, channel_id, name = None):
+    def __init__(self, filename, lock, channel_id, name = None, gain = 1):
         self.filename = filename
         self.channel_id = channel_id
         self.name = name or filename
         self.raw_data = None
-        self.sound = None
+        self.gain = gain
 
         self.loaded = False
         self.flag_paused = False
@@ -17,8 +18,10 @@ class MusicFile:
     def load_sound(self, lock):
         lock.acquire()
         print("Loading « {} »".format(self.name))
-        self.raw_data = pydub.AudioSegment.from_file(self.filename).set_frame_rate(44100).raw_data
-        self.sound = pygame.mixer.Sound(self.raw_data)
+        volume_factor = 20 * math.log10(self.gain)
+        audio_segment = pydub.AudioSegment.from_file(self.filename).set_frame_rate(44100).apply_gain(volume_factor)
+        self.sound_duration = audio_segment.duration_seconds
+        self.raw_data = audio_segment.raw_data
         print("Loaded « {} »".format(self.name))
         self.loaded = True
         lock.release()
@@ -35,15 +38,14 @@ class MusicFile:
         self.set_volume(volume)
 
         if start_at > 0:
-            song_duration = self.sound.get_length()
             raw_data_length = len(self.raw_data)
-            start_offset = int((raw_data_length / song_duration) * start_at)
+            start_offset = int((raw_data_length / self.sound_duration) * start_at)
             start_offset = start_offset - (start_offset % 2)
-            self.sound = pygame.mixer.Sound(self.raw_data[start_offset:])
+            sound = pygame.mixer.Sound(self.raw_data[start_offset:])
         else:
-            self.sound = pygame.mixer.Sound(self.raw_data)
+            sound = pygame.mixer.Sound(self.raw_data)
 
-        self.channel().play(self.sound, fade_ms = fade_in * 1000)
+        self.channel().play(sound, fade_ms = int(fade_in * 1000))
         self.flag_paused = False
 
     def pause(self):
@@ -56,7 +58,7 @@ class MusicFile:
 
     def stop(self, fade_out = 0):
         if fade_out > 0:
-            self.channel().fadeout(fade_out * 1000)
+            self.channel().fadeout(int(fade_out * 1000))
         else:
             self.channel().stop()
 
@@ -65,7 +67,7 @@ class MusicFile:
             value = 0
         if value > 100:
             value = 100
-        self.sound.set_volume(value / 100)
+        self.channel().set_volume(value / 100)
 
     def wait_end(self):
         pass