Use workflow for music_files

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

diff --git a/helpers/music_file.py b/helpers/music_file.py
index 36a7dd9ee913bc350058ae24de4079c17a4eb749..f9c5816c825361da77a6dc609e2291b8c2e1ff8a 100644 (file)
--- a/helpers/music_file.py
+++ b/helpers/music_file.py
@@ -1,58 +1,114 @@
 import threading
 import pydub
 import pygame
+import math
+import time
+from transitions.extensions import HierarchicalMachine as Machine
+
+class MusicFile(Machine):
+    def __init__(self, filename, lock, channel_id, name = None, gain = 1):
+        states = [
+            'initial',
+            'loading',
+            'failed',
+            { 'name': 'loaded', 'children': ['stopped', 'playing', 'paused'] }
+        ]
+        transitions = [
+            { 'trigger': 'load', 'source':  'initial', 'dest': 'loading'},
+            { 'trigger': 'fail', 'source':  'loading', 'dest': 'failed'},
+            { 'trigger': 'success', 'source':  'loading', 'dest': 'loaded_stopped'},
+            #{ 'trigger': 'play', 'source':  'loaded_stopped', 'dest': 'loaded_playing'},
+            #{ 'trigger': 'pause', 'source':  'loaded_playing', 'dest': 'loaded_paused'},
+            #{ 'trigger': 'stop', 'source':  ['loaded_playing','loaded_paused'], 'dest': 'loaded_stopped'}
+        ]
+
+        Machine.__init__(self, states=states, transitions=transitions, initial='initial')
 
-class MusicFile:
-    def __init__(self, filename, lock):
         self.filename = filename
-        self.channel = None
+        self.channel_id = channel_id
+        self.name = name or filename
         self.raw_data = None
-        self.sound = None
+        self.gain = gain
 
-        self.loaded = False
-        threading.Thread(target = self.load_sound, args = [lock]).start()
+        self.flag_paused = False
+        threading.Thread(name = "MSMusicLoad", target = self.load, kwargs = {'lock': lock}).start()
 
-    def load_sound(self, lock):
+    def on_enter_loading(self, lock=None):
         lock.acquire()
-        print("Loading {}".format(self.filename))
-        self.raw_data = pydub.AudioSegment.from_file(self.filename).raw_data
-        self.sound = pygame.mixer.Sound(self.raw_data)
-        print("Loaded {}".format(self.filename))
-        self.loaded = True
-        lock.release()
+        try:
+            print("Loading « {} »".format(self.name))
+            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
+        except Exception as e:
+            print("failed to load « {} »: {}".format(self.name, e))
+            self.loading_error = e
+            self.fail()
+        else:
+            self.success()
+            print("Loaded « {} »".format(self.name))
+        finally:
+            lock.release()
+
+    def check_is_loaded(self):
+        return self.state.startswith('loaded_')
 
     def is_playing(self):
-        return self.channel is not None and self.channel.get_busy()
+        return self.channel().get_busy()
+
+    def is_paused(self):
+        return self.flag_paused
+
+    @property
+    def sound_position(self):
+        if self.is_playing() and not self.is_paused():
+            return min(time.time() - self.started_at, self.sound_duration)
+        elif self.is_playing() and self.is_paused():
+            return min(self.paused_at - self.started_at, self.sound_duration)
+        else:
+            return 0
 
     def play(self, fade_in = 0, volume = 100, start_at = 0):
         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 = self.sound.play(fade_ms = fade_in * 1000)
+        self.started_at = time.time()
+        self.channel().play(sound, fade_ms = int(fade_in * 1000))
+        self.flag_paused = False
 
     def pause(self):
-        if self.channel is not None:
-            self.channel.pause()
+        self.paused_at = time.time()
+        self.channel().pause()
+        self.flag_paused = True
+
+    def unpause(self):
+        self.started_at += (time.time() - self.paused_at)
+        self.channel().unpause()
+        self.flag_paused = False
 
     def stop(self, fade_out = 0):
-        self.channel = None
         if fade_out > 0:
-            self.sound.fadeout(fade_out * 1000)
+            self.channel().fadeout(int(fade_out * 1000))
         else:
-            self.sound.stop()
+            self.channel().stop()
 
     def set_volume(self, value):
         if value < 0:
             value = 0
         if value > 100:
             value = 100
-        self.sound.set_volume(value / 100)
+        self.channel().set_volume(value / 100)
+
+    def wait_end(self):
+        pass
 
+    def channel(self):
+        return pygame.mixer.Channel(self.channel_id)