Make music fading more solid - issue #3

Ensure nothing interrupts the stop - release - nullify sequence. Also
don't limit how many concurrent fades there can be.

app/music.py

@@ -8,6 +8,8 @@ from time import sleep
 
 from log import DEBUG, ERROR
 
+lock = threading.Lock()
+
 
 class Music:
     """
@@ -16,7 +18,7 @@ class Music:
 
     def __init__(self):
         self.current_track_start_time = None
-        self.fading = False
+        self.fading = 0
         self.VLC = vlc.Instance()
         self.player = None
         self.track_path = None
@@ -32,13 +34,13 @@ class Music:
 
         DEBUG("music.fade()", True)
 
-        if not self.playing():
-            return None
-
-        # Only allow one track to fade at a time
-        if self.fading:
+        if not self.player:
             return
-        self.fading = True
+
+        if not self.player.get_position() > 0 and self.player.is_playing():
+            return
+
+        self.fading += 1
 
         thread = threading.Thread(target=self._fade)
         thread.start()
@@ -51,10 +53,14 @@ class Music:
         # Take a copy of current player to allow another track to be
         # started without interfering here
 
-        p = self.player
-
         DEBUG(f"music._fade(), {self.player=}", True)
 
+        with lock:
+            p = self.player
+            self.player = None
+
+        DEBUG(f"music._fade() post-lock, {self.player=}", True)
+
         fade_time = Config.FADE_TIME / 1000
         steps = Config.FADE_STEPS
         sleep_time = fade_time / steps
@@ -69,27 +75,38 @@ class Music:
         measures_to_reduce_by = 0
         for i in range(1, steps + 1):
             measures_to_reduce_by += i
-            volume_factor = 1 - (measures_to_reduce_by / total_measures_count)
+            volume_factor = 1 - (
+                measures_to_reduce_by / total_measures_count)
             p.audio_set_volume(int(self.max_volume * volume_factor))
             sleep(sleep_time)
 
-        self.stop(p)
-        self.fading = False
+        with lock:
+            DEBUG(f"music._facde(), stopping {p=}", True)
+
+            p.stop()
+            DEBUG(f"Releasing player {p=}", True)
+            p.release()
+            # Ensure we don't reference player after release
+            p = None
+
+        self.fading -= 1
 
     def get_playtime(self):
         "Return elapsed play time"
 
-        if not self.player:
-            return None
+        with lock:
+            if not self.player:
+                return None
 
-        return self.player.get_time()
+            return self.player.get_time()
 
     def get_position(self):
         "Return current position"
 
-        DEBUG("music.get_position", True)
+        with lock:
+            DEBUG("music.get_position", True)
 
-        return self.player.get_position()
+            return self.player.get_position()
 
     def play(self, path):
         """
@@ -118,46 +135,44 @@ class Music:
         get_position seems more reliable.
         """
 
-        if self.player:
-            if self.player.get_position() > 0 and self.player.is_playing():
-                return True
+        with lock:
+            if self.player:
+                if self.player.get_position() > 0 and self.player.is_playing():
+                    return True
 
-        # We take a copy of the player when fading, so we could be
-        # playing in a fade nowFalse
-        return self.fading
+            # We take a copy of the player when fading, so we could be
+            # playing in a fade nowFalse
+            return self.fading > 0
 
     def set_position(self, ms):
         "Set current play time in milliseconds from start"
 
-        return self.player.set_time(ms)
+        with lock:
+            return self.player.set_time(ms)
 
     def set_volume(self, volume):
         "Set maximum volume used for player"
 
-        if not self.player:
-            return
-
-        self.max_volume = volume
-        self.player.audio_set_volume(volume)
-
-    def stop(self, player=None):
-        "Immediately stop playing"
-
-        DEBUG(f"music.stop(), {player=}", True)
-
-        if not player:
+        with lock:
             if not self.player:
                 return
-            player = self.player
 
-        DEBUG(f"music.stop({player=})")
+            self.max_volume = volume
+            self.player.audio_set_volume(volume)
 
-        position = player.get_position()
-        player.stop()
-        p = player
-        # Ensure we don't reference player after release
-        player = None
-        DEBUG(f"Releasing player {p=}", True)
-        p.release()
+    def stop(self):
+        "Immediately stop playing"
 
-        return position
+        with lock:
+            DEBUG(f"music.stop(), {self.player=}", True)
+
+            if not self.player:
+                return
+
+            position = self.player.get_position()
+            self.player.stop()
+            DEBUG(f"Releasing player {self.player=}", True)
+            self.player.release()
+            # Ensure we don't reference player after release
+            self.player = None
+            return position

app/musicmuster.py

@@ -138,8 +138,11 @@ class Window(QMainWindow, Ui_MainWindow):
         self.actionPlay_next.triggered.connect(self.play_next)
         self.actionSearch_database.triggered.connect(self.search_database)
         self.actionSelect_next_track.triggered.connect(self.select_next_track)
+        self.actionSelect_played_tracks.triggered.connect(self.select_played)
         self.actionSelect_previous_track.triggered.connect(
             self.select_previous_track)
+        self.actionSelect_unplayed_tracks.triggered.connect(
+            self.select_unplayed)
         self.actionSetNext.triggered.connect(self.set_next_track)
         self.actionSkip_next.triggered.connect(self.play_next)
         self.actionSkipToEnd.triggered.connect(self.test_skip_to_end)
@@ -429,6 +432,11 @@ class Window(QMainWindow, Ui_MainWindow):
 
         self.visible_playlist_tab().select_next_track()
 
+    def select_played(self):
+        "Select all played tracks in playlist"
+
+        self.visible_playlist_tab().select_played_tracks()
+
     def select_previous_track(self):
         "Select previous or first track in playlist"
 
@@ -449,6 +457,11 @@ class Window(QMainWindow, Ui_MainWindow):
                 self.next_track = Tracks.get_track(session, next_track_id)
             self.update_headers()
 
+    def select_unplayed(self):
+        "Select all unplayed tracks in playlist"
+
+        self.visible_playlist_tab().select_unplayed_tracks()
+
     def show_warning(self, title, msg):
         "Display a warning to user"
 
@@ -491,16 +504,19 @@ class Window(QMainWindow, Ui_MainWindow):
     def stop_playing(self, fade=True):
         "Stop playing current track"
 
-        DEBUG("musicmuster.stop_playing()")
+        DEBUG("musicmuster.stop_playing()", True)
 
         if not self.music.playing():
+            DEBUG("musicmuster.stop_playing(): not playing", True)
             return
 
         self.previous_track_position = self.music.get_position()
         if fade:
+            DEBUG("musicmuster.stop_playing(): fading music", True)
             self.music.fade()
         else:
             self.music.stop()
+            DEBUG("musicmuster.stop_playing(): stopping music", True)
         self.current_track_playlist_tab.clear_current()
 
         # Shuffle tracks along
@@ -550,7 +566,7 @@ class Window(QMainWindow, Ui_MainWindow):
         if not self.even_tick:
             return
 
-        if self.music.playing():
+        if self.music.player and self.music.playing():
             self.playing = True
             playtime = self.music.get_playtime()
             time_to_fade = (self.current_track.fade_at - playtime)

app/playlists.py

@@ -425,6 +425,21 @@ class PlaylistTab(QTableWidget):
 
         self.selectRow(row)
 
+    def select_played_tracks(self):
+        "Select all played tracks in playlist"
+
+        # Need to allow multiple rows to be selected
+        self.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)
+
+        self.clearSelection()
+
+        for row in range(self.rowCount()):
+            if self._get_row_id(row) in self.played_tracks:
+                self.selectRow(row)
+
+        # Reset extended selection
+        self.setSelectionMode(QtWidgets.QAbstractItemView.ExtendedSelection)
+
     def select_previous_track(self):
         """
         Select previous or last track. Don't select notes. Wrap at first row.
@@ -458,6 +473,25 @@ class PlaylistTab(QTableWidget):
 
         self.selectRow(row)
 
+    def select_unplayed_tracks(self):
+        "Select all unplayed tracks in playlist"
+
+        # Need to allow multiple rows to be selected
+        self.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)
+        notes_rows = self._meta_get_notes()
+
+        self.clearSelection()
+
+        for row in range(self.rowCount()):
+            if row in notes_rows:
+                continue
+            if self._get_row_id(row) in self.played_tracks:
+                continue
+            self.selectRow(row)
+
+        # Reset extended selection
+        self.setSelectionMode(QtWidgets.QAbstractItemView.ExtendedSelection)
+
     def set_selected_as_next(self):
         """
         Sets the selected track as the next track.

app/ui/main_window.ui

@@ -757,6 +757,8 @@ border: 1px solid rgb(85, 87, 83);</string>
     <addaction name="actionAdd_file"/>
     <addaction name="action_Clear_selection"/>
     <addaction name="separator"/>
+    <addaction name="actionSelect_unplayed_tracks"/>
+    <addaction name="actionSelect_played_tracks"/>
     <addaction name="actionMoveSelected"/>
     <addaction name="separator"/>
     <addaction name="actionExport_playlist"/>
@@ -977,6 +979,16 @@ border: 1px solid rgb(85, 87, 83);</string>
     <string>K</string>
    </property>
   </action>
+  <action name="actionSelect_played_tracks">
+   <property name="text">
+    <string>Select played tracks</string>
+   </property>
+  </action>
+  <action name="actionSelect_unplayed_tracks">
+   <property name="text">
+    <string>Select unplayed tracks</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="icons.qrc"/>