Added prefetch logic

libremsonic/app.py

@@ -444,9 +444,11 @@ class LibremsonicApp(Gtk.Application):
                 self.state.song_progress = 0
 
             def on_song_download_complete(_):
-                # This will now return the local media.
-                downloaded_filename = CacheManager.get_song_filename_or_stream(
-                    song)[0]
+                # Switch to the local media if the player can hotswap (MPV can,
+                # Chromecast cannot hotswap without lag).
+                if self.player.can_hotswap_source:
+                    downloaded_filename = (
+                        CacheManager.get_song_filename_or_stream(song)[0])
                     self.player.play_media(downloaded_filename,
                                            self.state.song_progress, song)
                 GLib.idle_add(self.update_window)
@@ -470,6 +472,23 @@ class LibremsonicApp(Gtk.Application):
                 self.state.play_queue = play_queue
                 self.save_play_queue()
 
+            # Prefetch songs
+            if self.state.repeat_type != RepeatType.REPEAT_SONG:
+                song_idx = self.state.play_queue.index(song.id)
+                prefetch_idxs = []
+                for i in range(self.state.config.prefetch_amount):
+                    prefetch_idx = song_idx + 1 + i
+                    play_queue_len = len(self.state.play_queue)
+                    if (prefetch_idx < play_queue_len or
+                            self.state.repeat_type == RepeatType.REPEAT_QUEUE):
+                        prefetch_idxs.append(prefetch_idx % play_queue_len)
+                CacheManager.batch_download_songs(
+                    [self.state.play_queue[i] for i in prefetch_idxs],
+                    before_download=lambda: GLib.idle_add(self.update_window),
+                    on_song_download_complete=lambda _: GLib.idle_add(
+                        self.update_window),
+                )
+
         song_details_future = CacheManager.get_song_details(song)
         song_details_future.add_done_callback(
             lambda f: GLib.idle_add(do_play_song, f.result()), )

libremsonic/ui/artists.py

@@ -53,7 +53,7 @@ class ArtistsPanel(Gtk.Paned):
         self.pack2(self.artist_detail_panel, True, False)
 
     def update(self, state: ApplicationState):
-        self.artist_list.update()
+        self.artist_list.update(state)
         if self.artist_id:
             self.artist_detail_panel.update(self.artist_id)
 
@@ -99,7 +99,7 @@ class ArtistList(Gtk.Box):
         list_scroll_window.add(self.list)
         self.pack_start(list_scroll_window, True, True, 0)
 
-    def update(self, force=False):
+    def update(self, state=None, force=False):
         self.update_list(force=force)
 
     @util.async_callback(

libremsonic/ui/common/players.py

@@ -48,6 +48,10 @@ class Player:
     def song_loaded(self):
         return self._song_loaded
 
+    @property
+    def can_hotswap_source(self):
+        return self._can_hotswap_source
+
     @property
     def volume(self):
         return self._get_volume()
@@ -104,6 +108,7 @@ class MPVPlayer(Player):
         self.mpv = mpv.MPV()
         self.progress_value_lock = threading.Lock()
         self.progress_value_count = 0
+        self._can_hotswap_source = True
 
         @self.mpv.property_observer('time-pos')
         def time_observer(_name, value):
@@ -229,6 +234,8 @@ class ChromecastPlayer(Player):
         super().__init__(*args)
         self._timepos = None
         self.time_incrementor_running = False
+        self._can_hotswap_source = False
+
         ChromecastPlayer.cast_status_listener.on_new_cast_status = self.on_new_cast_status
         ChromecastPlayer.media_status_listener.on_new_media_status = self.on_new_media_status
 

libremsonic/ui/playlists.py

@@ -234,7 +234,6 @@ class PlaylistsPanel(Gtk.Paned):
 
         self.playlist_songs = Gtk.TreeView(
             model=self.playlist_song_model,
-            headers_visible=False,  # TODO use the config value for this
             reorderable=True,
             margin_top=15,
             enable_search=True,
@@ -460,6 +459,8 @@ class PlaylistsPanel(Gtk.Paned):
         else:
             self.playlist_action_buttons.hide()
 
+        self.playlist_songs.set_headers_visible(state.config.show_headers)
+
     def set_playlist_list_loading(self, loading_status):
         if loading_status:
             self.playlist_list_loading.show()