WIP: time to vocals: preview +- working

app/config.py

@@ -79,6 +79,8 @@ class Config(object):
     OBS_PASSWORD = "auster"
     OBS_PORT = 4455
     PLAY_SETTLE = 500000
+    PREVIEW_ADVANCE_MS = 5000
+    PREVIEW_BACK_MS = 5000
     REPLACE_FILES_DEFAULT_SOURCE = "/home/kae/music/Singles/tmp"
     RETURN_KEY_DEBOUNCE_MS = 500
     ROOT = os.environ.get("ROOT") or "/home/kae/music"
@@ -88,8 +90,10 @@ class Config(object):
     TEXT_NO_TRACK_NO_NOTE = "[Section header]"
     TOD_TIME_FORMAT = "%H:%M:%S"
     TRACK_TIME_FORMAT = "%H:%M:%S"
-    VOLUME_VLC_DEFAULT = 75
+    VLC_MAIN_PLAYER_NAME = "MusicMuster Main Player"
-    VOLUME_VLC_DROP3db = 65
+    VLC_PREVIEW_PLAYER_NAME = "MusicMuster Preview Player"
+    VLC_VOLUME_DEFAULT = 75
+    VLC_VOLUME_DROP3db = 65
     WARNING_MS_BEFORE_FADE = 5500
     WARNING_MS_BEFORE_SILENCE = 5500
     WEB_ZOOM_FACTOR = 1.2

app/music.py

@@ -1,18 +1,24 @@
+# Standard library imports
+import datetime as dt
 import threading
-import vlc  # type: ignore
-
-from config import Config
-from helpers import file_is_unreadable
-from typing import Optional
 from time import sleep
+from typing import Optional
 
-from log import log
+# PyQt imports
-
 from PyQt6.QtCore import (
     QRunnable,
     QThreadPool,
 )
 
+# Third party imports
+import vlc  # type: ignore
+
+# App imports
+from config import Config
+from helpers import file_is_unreadable
+from log import log
+
+
 lock = threading.Lock()
 
 
@@ -53,10 +59,31 @@ class Music:
     Manage the playing of music tracks
     """
 
-    def __init__(self) -> None:
+    def __init__(self, name) -> None:
         self.VLC = vlc.Instance()
+        self.VLC.set_user_agent(name, name)
         self.player = None
-        self.max_volume = Config.VOLUME_VLC_DEFAULT
+        self.name = name
+        self.max_volume = Config.VLC_VOLUME_DEFAULT
+        self.start_dt: Optional[dt.datetime] = None
+
+    def _adjust_by_ms(self, ms: int) -> None:
+        """Move player position by ms milliseconds"""
+
+        if not self.player:
+            return
+
+        elapsed_ms = self.get_playtime()
+        position = self.get_position()
+        if not position:
+            position = 0
+        new_position = max(0, position + ((position * ms) / elapsed_ms))
+        self.player.set_position(new_position)
+        # Adjus start time so elapsed time calculations are correct
+        if new_position == 0:
+            self.start_dt = dt.datetime.now()
+        else:
+            self.start_dt -= dt.timedelta(milliseconds=ms)
 
     def fade(self, fade_seconds: int = Config.FADEOUT_SECONDS) -> None:
         """
@@ -66,7 +93,7 @@ class Music:
         to hold up the UI during the fade.
         """
 
-        log.info("Music.stop()")
+        log.info(f"Music[{self.name}].stop()")
 
         if not self.player:
             return
@@ -84,6 +111,21 @@ class Music:
         fader = FadeTrack(p, fade_seconds=fade_seconds)
         pool.start(fader)
 
+    def get_playtime(self) -> int:
+        """
+        Return number of milliseconds current track has been playing or
+        zero if not playing. The vlc function get_time() only updates 3-4
+        times a second; this function has much better resolution.
+        """
+
+        if self.player is None or self.start_dt is None:
+            return 0
+
+        now = dt.datetime.now()
+        elapsed_time = now - self.start_dt
+        elapsed_seconds = elapsed_time.seconds + (elapsed_time.microseconds / 1000000)
+        return int(elapsed_seconds * 1000)
+
     def get_position(self) -> Optional[float]:
         """Return current position"""
 
@@ -91,6 +133,41 @@ class Music:
             return None
         return self.player.get_position()
 
+    def is_playing(self) -> bool:
+        """
+        Return True if we're playing
+        """
+
+        if not self.player:
+            return False
+
+        # There is a discrete time between starting playing a track and
+        # player.is_playing() returning True, so assume playing if less
+        # than Config.PLAY_SETTLE microseconds have passed since
+        # starting play.
+        if self.start_dt and (
+                self.player.is_playing()
+                or (dt.datetime.now() - self.start_dt)
+                < dt.timedelta(microseconds=Config.PLAY_SETTLE)
+        ):
+            return True
+
+        return False
+
+    def move_back(self, ms: int) -> None:
+        """
+        Rewind player by ms milliseconds
+        """
+
+        self._adjust_by_ms(ms * -1)
+
+    def move_forward(self, ms: int) -> None:
+        """
+        Rewind player by ms milliseconds
+        """
+
+        self._adjust_by_ms(ms)
+
     def play(self, path: str, position: Optional[float] = None) -> None:
         """
         Start playing the track at path.
@@ -98,7 +175,7 @@ class Music:
         Log and return if path not found.
         """
 
-        log.info(f"Music.play({path=}, {position=}")
+        log.info(f"Music[{self.name}].play({path=}, {position=}")
 
         if file_is_unreadable(path):
             log.error(f"play({path}): path not readable")
@@ -108,9 +185,21 @@ class Music:
         self.player = media.player_new_from_media()
         if self.player:
             _ = self.player.play()
-            self.set_volume(self.max_volume)
+            self.start_dt = dt.datetime.now()
             if position:
                 self.player.set_position(position)
+            # For as-yet unknown reasons. sometimes the volume gets
+            # reset to zero within 200mS or so of starting play. This
+            # only happened since moving to Debian 12, which uses
+            # Pipewire for sound (which may be irrelevant).
+            for _ in range(3):
+                if self.player:
+                    volume = self.player.audio_get_volume()
+                    if volume < Config.VLC_VOLUME_DEFAULT:
+                        self.set_volume(Config.VLC_VOLUME_DEFAULT)
+                        log.debug(f"Reset from {volume=}")
+                        break
+                sleep(0.1)
 
     def set_volume(self, volume=None, set_default=True) -> None:
         """Set maximum volume used for player"""
@@ -122,14 +211,16 @@ class Music:
             self.max_volume = volume
 
         if volume is None:
-            volume = Config.VOLUME_VLC_DEFAULT
+            volume = Config.VLC_VOLUME_DEFAULT
 
         self.player.audio_set_volume(volume)
 
     def stop(self) -> float:
         """Immediately stop playing"""
 
-        log.info("Music.stop()")
+        log.info(f"Music[{self.name}].stop()")
+
+        self.start_dt = None
 
         if not self.player:
             return 0.0

app/musicmuster.py

@@ -47,7 +47,7 @@ from PyQt6.QtWidgets import (
 )
 
 # Third party imports
-from pygame import mixer
+# from pygame import mixer
 import pipeclient
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm.session import Session
@@ -226,10 +226,12 @@ class Window(QMainWindow, Ui_MainWindow):
         self.setupUi(self)
 
         self.timer10: QTimer = QTimer()
+        self.timer100: QTimer = QTimer()
         self.timer500: QTimer = QTimer()
         self.timer1000: QTimer = QTimer()
 
-        self.music: music.Music = music.Music()
+        self.music: music.Music = music.Music(name=Config.VLC_MAIN_PLAYER_NAME)
+        self.preview_player: music.Music = music.Music(name=Config.VLC_PREVIEW_PLAYER_NAME)
         self.playing: bool = False
 
         self.set_main_window_size()
@@ -239,11 +241,6 @@ class Window(QMainWindow, Ui_MainWindow):
         self.txtSearch.setHidden(True)
         self.statusbar.addWidget(self.txtSearch)
         self.hide_played_tracks = False
-        try:
-            mixer.init()
-        except Exception:
-            helpers.show_warning(self, "Fatal error", "Cannot initialise sound device")
-            sys.exit(1)
 
         self.widgetFadeVolume.hideAxis("bottom")
         self.widgetFadeVolume.hideAxis("left")
@@ -267,6 +264,7 @@ class Window(QMainWindow, Ui_MainWindow):
         self.disable_selection_timing = False
         self.clock_counter = 0
         self.timer10.start(10)
+        self.timer100.start(100)
         self.timer500.start(500)
         self.timer1000.start(1000)
         self.signals = MusicMusterSignals()
@@ -306,7 +304,7 @@ class Window(QMainWindow, Ui_MainWindow):
                 btn.path = cart.path
                 btn.player = self.music.VLC.media_player_new(cart.path)
                 if btn.player:
-                    btn.player.audio_set_volume(Config.VOLUME_VLC_DEFAULT)
+                    btn.player.audio_set_volume(Config.VLC_VOLUME_DEFAULT)
                 if cart.enabled:
                     btn.setEnabled(True)
                     btn.pgb.setVisible(True)
@@ -420,7 +418,7 @@ class Window(QMainWindow, Ui_MainWindow):
                     btn.setEnabled(True)
                     # Setting to position 0 doesn't seem to work
                     btn.player = self.music.VLC.media_player_new(btn.path)
-                    btn.player.audio_set_volume(Config.VOLUME_VLC_DEFAULT)
+                    btn.player.audio_set_volume(Config.VLC_VOLUME_DEFAULT)
                     colour = Config.COLOUR_CART_READY
                     btn.setStyleSheet("background-color: " + colour + ";\n")
                     btn.pgb.setValue(0)
@@ -583,7 +581,9 @@ class Window(QMainWindow, Ui_MainWindow):
         self.btnDrop3db.clicked.connect(self.drop3db)
         self.btnFade.clicked.connect(self.fade)
         self.btnHidePlayed.clicked.connect(self.hide_played)
+        self.btnPreviewBack.clicked.connect(self.preview_back)
         self.btnPreview.clicked.connect(self.preview)
+        self.btnPreviewFwd.clicked.connect(self.preview_fwd)
         self.btnStop.clicked.connect(self.stop)
         self.hdrCurrentTrack.clicked.connect(self.show_current)
         self.hdrNextTrack.clicked.connect(self.show_next)
@@ -599,6 +599,7 @@ class Window(QMainWindow, Ui_MainWindow):
 
         self.timer10.timeout.connect(self.tick_10ms)
         self.timer500.timeout.connect(self.tick_500ms)
+        self.timer100.timeout.connect(self.tick_100ms)
         self.timer1000.timeout.connect(self.tick_1000ms)
 
     def create_playlist(
@@ -716,9 +717,9 @@ class Window(QMainWindow, Ui_MainWindow):
         """Drop music level by 3db if button checked"""
 
         if self.btnDrop3db.isChecked():
-            self.music.set_volume(Config.VOLUME_VLC_DROP3db, set_default=False)
+            self.music.set_volume(Config.VLC_VOLUME_DROP3db, set_default=False)
         else:
-            self.music.set_volume(Config.VOLUME_VLC_DEFAULT, set_default=False)
+            self.music.set_volume(Config.VLC_VOLUME_DEFAULT, set_default=False)
 
     def enable_escape(self, enabled: bool) -> None:
         """
@@ -781,21 +782,6 @@ class Window(QMainWindow, Ui_MainWindow):
 
         self.stop_playing(fade=True)
 
-    def get_playtime(self) -> int:
-        """
-        Return number of milliseconds current track has been playing or
-        zero if not playing. The vlc function get_time() only updates 3-4
-        times a second; this function has much better resolution.
-        """
-
-        if track_sequence.now.track_id is None or track_sequence.now.start_time is None:
-            return 0
-
-        now = dt.datetime.now()
-        track_start = track_sequence.now.start_time
-        elapsed_seconds = (now - track_start).total_seconds()
-        return int(elapsed_seconds * 1000)
-
     def hide_played(self):
         """Toggle hide played tracks"""
 
@@ -1146,7 +1132,6 @@ class Window(QMainWindow, Ui_MainWindow):
         - Clear next track
         - Restore volume if -3dB active
         - Play (new) current track.
-        - Ensure 100% volume
         - Show closing volume graph
         - Notify model
         - Note that track is now playing
@@ -1204,20 +1189,6 @@ class Window(QMainWindow, Ui_MainWindow):
             return
         self.music.play(track_sequence.now.path, position)
 
-        # Ensure 100% volume
-        # For as-yet unknown reasons. sometimes the volume gets
-        # reset to zero within 200mS or so of starting play. This
-        # only happened since moving to Debian 12, which uses
-        # Pipewire for sound (which may be irrelevant).
-        for _ in range(3):
-            if self.music.player:
-                volume = self.music.player.audio_get_volume()
-                if volume < Config.VOLUME_VLC_DEFAULT:
-                    self.music.set_volume()
-                    log.debug(f"Reset from {volume=}")
-                    break
-            sleep(0.1)
-
         # Show closing volume graph
         if track_sequence.now.fade_graph:
             track_sequence.now.fade_graph.plot()
@@ -1251,9 +1222,7 @@ class Window(QMainWindow, Ui_MainWindow):
 
     def preview(self) -> None:
         """
-        Preview selected or next track. We use a different mechanism to
+        Preview selected or next track.
-        normal track playing so that the user can route the output audio
-        differently (eg, to headphones).
         """
 
         if self.btnPreview.isChecked():
@@ -1265,11 +1234,21 @@ class Window(QMainWindow, Ui_MainWindow):
                 if not track_path:
                     self.btnPreview.setChecked(False)
                     return
-            mixer.music.load(track_path)
+            self.preview_player.play(path=track_path)
-            mixer.music.play()
 
         else:
-            mixer.music.stop()
+            self.preview_player.stop()
+            self.label_intro_timer.setText("0.0")
+
+    def preview_back(self) -> None:
+        """Wind back preview file"""
+
+        self.preview_player.move_back(Config.PREVIEW_BACK_MS)
+
+    def preview_fwd(self) -> None:
+        """Advance preview file"""
+
+        self.preview_player.move_forward(Config.PREVIEW_ADVANCE_MS)
 
     def rename_playlist(self) -> None:
         """
@@ -1678,14 +1657,24 @@ class Window(QMainWindow, Ui_MainWindow):
         # Update carts
         # self.cart_tick()
 
+    def tick_100ms(self) -> None:
+        """
+        Called every 100ms
+        """
+
+        # Ensure preview button is reset if preview finishes playing
+        self.btnPreview.setChecked(self.preview_player.is_playing())
+
+        # Update preview timer
+        if self.preview_player.is_playing():
+            playtime = self.preview_player.get_playtime()
+            self.label_intro_timer.setText(f"{playtime / 1000:.1f}")
+
     def tick_1000ms(self) -> None:
         """
         Called every 1000ms
         """
 
-        # Ensure preview button is reset if preview finishes playing
-        self.btnPreview.setChecked(mixer.music.get_busy())
-
         # Only update play clocks once a second so that their updates
         # are synchronised (otherwise it looks odd)
 
@@ -1693,20 +1682,8 @@ class Window(QMainWindow, Ui_MainWindow):
             return
 
         # If track is playing, update track clocks time and colours
-        # There is a discrete time between starting playing a track and
+        if self.music.player and self.music.player.is_playing():
-        # player.is_playing() returning True, so assume playing if less
+            playtime = self.player.get_playtime()
-        # than Config.PLAY_SETTLE microseconds have passed since
-        # starting play.
-        if (
-            self.music.player
-            and track_sequence.now.start_time
-            and (
-                self.music.player.is_playing()
-                or (dt.datetime.now() - track_sequence.now.start_time)
-                < dt.timedelta(microseconds=Config.PLAY_SETTLE)
-            )
-        ):
-            playtime = self.get_playtime()
             time_to_fade = track_sequence.now.fade_at - playtime
             time_to_silence = track_sequence.now.silence_at - playtime
 

app/ui/main_window.ui

@@ -229,10 +229,16 @@ padding-left: 8px;</string>
       </item>
       <item>
        <widget class="QFrame" name="frame_2">
+        <property name="minimumSize">
+         <size>
+          <width>0</width>
+          <height>131</height>
+         </size>
+        </property>
         <property name="maximumSize">
          <size>
           <width>230</width>
-          <height>16777215</height>
+          <height>131</height>
          </size>
         </property>
         <property name="frameShape">
@@ -241,13 +247,13 @@ padding-left: 8px;</string>
         <property name="frameShadow">
          <enum>QFrame::Raised</enum>
         </property>
-        <layout class="QGridLayout" name="gridLayout_2">
+        <layout class="QVBoxLayout" name="verticalLayout_10">
-         <item row="0" column="0">
+         <item>
           <widget class="QLabel" name="lblTOD">
            <property name="minimumSize">
             <size>
              <width>208</width>
-             <height>109</height>
+             <height>0</height>
             </size>
            </property>
            <property name="font">
@@ -263,6 +269,27 @@ padding-left: 8px;</string>
            </property>
           </widget>
          </item>
+         <item>
+          <widget class="QLabel" name="label_elapsed_timer">
+           <property name="font">
+            <font>
+             <family>FreeSans</family>
+             <pointsize>18</pointsize>
+             <weight>50</weight>
+             <bold>false</bold>
+            </font>
+           </property>
+           <property name="styleSheet">
+            <string notr="true">color: black;</string>
+           </property>
+           <property name="text">
+            <string>00:00 / 00:00</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignCenter</set>
+           </property>
+          </widget>
+         </item>
         </layout>
        </widget>
       </item>
@@ -435,20 +462,220 @@ padding-left: 8px;</string>
            </widget>
           </item>
           <item>
-           <widget class="QLabel" name="label_elapsed_timer">
+           <widget class="QGroupBox" name="groupBoxIntroControls">
+            <property name="minimumSize">
+             <size>
+              <width>132</width>
+              <height>46</height>
+             </size>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>132</width>
+              <height>46</height>
+             </size>
+            </property>
+            <property name="title">
+             <string/>
+            </property>
+            <widget class="QPushButton" name="btnPreviewStart">
+             <property name="geometry">
+              <rect>
+               <x>0</x>
+               <y>0</y>
+               <width>44</width>
+               <height>23</height>
+              </rect>
+             </property>
+             <property name="minimumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="maximumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="text">
+              <string>&lt;&lt;</string>
+             </property>
+            </widget>
+            <widget class="QPushButton" name="btnIntroArm">
+             <property name="geometry">
+              <rect>
+               <x>44</x>
+               <y>0</y>
+               <width>44</width>
+               <height>23</height>
+              </rect>
+             </property>
+             <property name="minimumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="maximumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="text">
+              <string>o</string>
+             </property>
+             <property name="checkable">
+              <bool>true</bool>
+             </property>
+            </widget>
+            <widget class="QPushButton" name="btnPreviewEnd">
+             <property name="geometry">
+              <rect>
+               <x>88</x>
+               <y>0</y>
+               <width>44</width>
+               <height>23</height>
+              </rect>
+             </property>
+             <property name="minimumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="maximumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="text">
+              <string>&gt;&gt;</string>
+             </property>
+            </widget>
+            <widget class="QPushButton" name="btnPreviewBack">
+             <property name="geometry">
+              <rect>
+               <x>0</x>
+               <y>23</y>
+               <width>44</width>
+               <height>23</height>
+              </rect>
+             </property>
+             <property name="minimumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="maximumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="text">
+              <string>&lt;</string>
+             </property>
+            </widget>
+            <widget class="QPushButton" name="btnPreviewMark">
+             <property name="geometry">
+              <rect>
+               <x>44</x>
+               <y>23</y>
+               <width>44</width>
+               <height>23</height>
+              </rect>
+             </property>
+             <property name="minimumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="maximumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="text">
+              <string>*</string>
+             </property>
+            </widget>
+            <widget class="QPushButton" name="btnPreviewFwd">
+             <property name="geometry">
+              <rect>
+               <x>88</x>
+               <y>23</y>
+               <width>44</width>
+               <height>23</height>
+              </rect>
+             </property>
+             <property name="minimumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="maximumSize">
+              <size>
+               <width>44</width>
+               <height>23</height>
+              </size>
+             </property>
+             <property name="text">
+              <string>&gt;</string>
+             </property>
+            </widget>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QFrame" name="frame_intro">
+         <property name="minimumSize">
+          <size>
+           <width>152</width>
+           <height>112</height>
+          </size>
+         </property>
+         <property name="styleSheet">
+          <string notr="true"/>
+         </property>
+         <property name="frameShape">
+          <enum>QFrame::StyledPanel</enum>
+         </property>
+         <property name="frameShadow">
+          <enum>QFrame::Raised</enum>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_9">
+          <item>
+           <widget class="QLabel" name="label_7">
+            <property name="text">
+             <string>Intro</string>
+            </property>
+            <property name="alignment">
+             <set>Qt::AlignCenter</set>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="label_intro_timer">
             <property name="font">
              <font>
               <family>FreeSans</family>
-              <pointsize>18</pointsize>
+              <pointsize>40</pointsize>
               <weight>50</weight>
               <bold>false</bold>
              </font>
             </property>
-            <property name="styleSheet">
-             <string notr="true">color: black;</string>
-            </property>
             <property name="text">
-             <string>00:00 / 00:00</string>
+             <string>0:0</string>
             </property>
             <property name="alignment">
              <set>Qt::AlignCenter</set>
@@ -592,46 +819,36 @@ padding-left: 8px;</string>
          <property name="frameShadow">
           <enum>QFrame::Raised</enum>
          </property>
-         <widget class="QLabel" name="label_5">
+         <layout class="QVBoxLayout" name="verticalLayout_7">
-          <property name="geometry">
+          <item>
-           <rect>
+           <widget class="QLabel" name="label_5">
-            <x>10</x>
+            <property name="text">
-            <y>10</y>
+             <string>Silent</string>
-            <width>45</width>
+            </property>
-            <height>24</height>
+            <property name="alignment">
-           </rect>
+             <set>Qt::AlignCenter</set>
-          </property>
+            </property>
-          <property name="text">
+           </widget>
-           <string>Silent</string>
+          </item>
-          </property>
+          <item>
-          <property name="alignment">
+           <widget class="QLabel" name="label_silent_timer">
-           <set>Qt::AlignCenter</set>
+            <property name="font">
-          </property>
+             <font>
-         </widget>
+              <family>FreeSans</family>
-         <widget class="QLabel" name="label_silent_timer">
+              <pointsize>40</pointsize>
-          <property name="geometry">
+              <weight>50</weight>
-           <rect>
+              <bold>false</bold>
-            <x>10</x>
+             </font>
-            <y>48</y>
+            </property>
-            <width>132</width>
+            <property name="text">
-            <height>54</height>
+             <string>00:00</string>
-           </rect>
+            </property>
-          </property>
+            <property name="alignment">
-          <property name="font">
+             <set>Qt::AlignCenter</set>
-           <font>
+            </property>
-            <family>FreeSans</family>
+           </widget>
-            <pointsize>40</pointsize>
+          </item>
-            <weight>50</weight>
+         </layout>
-            <bold>false</bold>
-           </font>
-          </property>
-          <property name="text">
-           <string>00:00</string>
-          </property>
-          <property name="alignment">
-           <set>Qt::AlignCenter</set>
-          </property>
-         </widget>
         </widget>
        </item>
        <item>
@@ -661,7 +878,7 @@ padding-left: 8px;</string>
          <property name="maximumSize">
           <size>
            <width>151</width>
-           <height>16777215</height>
+           <height>112</height>
           </size>
          </property>
          <property name="frameShape">
@@ -812,7 +1029,7 @@ padding-left: 8px;</string>
   <action name="actionPlay_next">
    <property name="icon">
     <iconset>
-     <normaloff>../../../../.designer/backup/icon-play.png</normaloff>../../../../.designer/backup/icon-play.png</iconset>
+     <normaloff>../../../../../../.designer/backup/icon-play.png</normaloff>../../../../../../.designer/backup/icon-play.png</iconset>
    </property>
    <property name="text">
     <string>&amp;Play next</string>
@@ -836,7 +1053,7 @@ padding-left: 8px;</string>
   <action name="actionInsertTrack">
    <property name="icon">
     <iconset>
-     <normaloff>../../../../.designer/backup/icon_search_database.png</normaloff>../../../../.designer/backup/icon_search_database.png</iconset>
+     <normaloff>../../../../../../.designer/backup/icon_search_database.png</normaloff>../../../../../../.designer/backup/icon_search_database.png</iconset>
    </property>
    <property name="text">
     <string>Insert &amp;track...</string>
@@ -848,7 +1065,7 @@ padding-left: 8px;</string>
   <action name="actionAdd_file">
    <property name="icon">
     <iconset>
-     <normaloff>../../../../.designer/backup/icon_open_file.png</normaloff>../../../../.designer/backup/icon_open_file.png</iconset>
+     <normaloff>../../../../../../.designer/backup/icon_open_file.png</normaloff>../../../../../../.designer/backup/icon_open_file.png</iconset>
    </property>
    <property name="text">
     <string>Add &amp;file</string>
@@ -860,7 +1077,7 @@ padding-left: 8px;</string>
   <action name="actionFade">
    <property name="icon">
     <iconset>
-     <normaloff>../../../../.designer/backup/icon-fade.png</normaloff>../../../../.designer/backup/icon-fade.png</iconset>
+     <normaloff>../../../../../../.designer/backup/icon-fade.png</normaloff>../../../../../../.designer/backup/icon-fade.png</iconset>
    </property>
    <property name="text">
     <string>F&amp;ade</string>

app/ui/main_window_ui.py

@@ -132,20 +132,32 @@ class Ui_MainWindow(object):
         self.verticalLayout.addWidget(self.hdrNextTrack)
         self.horizontalLayout_3.addLayout(self.verticalLayout)
         self.frame_2 = QtWidgets.QFrame(parent=self.centralwidget)
-        self.frame_2.setMaximumSize(QtCore.QSize(230, 16777215))
+        self.frame_2.setMinimumSize(QtCore.QSize(0, 131))
+        self.frame_2.setMaximumSize(QtCore.QSize(230, 131))
         self.frame_2.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
         self.frame_2.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
         self.frame_2.setObjectName("frame_2")
-        self.gridLayout_2 = QtWidgets.QGridLayout(self.frame_2)
+        self.verticalLayout_10 = QtWidgets.QVBoxLayout(self.frame_2)
-        self.gridLayout_2.setObjectName("gridLayout_2")
+        self.verticalLayout_10.setObjectName("verticalLayout_10")
         self.lblTOD = QtWidgets.QLabel(parent=self.frame_2)
-        self.lblTOD.setMinimumSize(QtCore.QSize(208, 109))
+        self.lblTOD.setMinimumSize(QtCore.QSize(208, 0))
         font = QtGui.QFont()
         font.setPointSize(35)
         self.lblTOD.setFont(font)
         self.lblTOD.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
         self.lblTOD.setObjectName("lblTOD")
-        self.gridLayout_2.addWidget(self.lblTOD, 0, 0, 1, 1)
+        self.verticalLayout_10.addWidget(self.lblTOD)
+        self.label_elapsed_timer = QtWidgets.QLabel(parent=self.frame_2)
+        font = QtGui.QFont()
+        font.setFamily("FreeSans")
+        font.setPointSize(18)
+        font.setBold(False)
+        font.setWeight(50)
+        self.label_elapsed_timer.setFont(font)
+        self.label_elapsed_timer.setStyleSheet("color: black;")
+        self.label_elapsed_timer.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.label_elapsed_timer.setObjectName("label_elapsed_timer")
+        self.verticalLayout_10.addWidget(self.label_elapsed_timer)
         self.horizontalLayout_3.addWidget(self.frame_2)
         self.gridLayout_4.addLayout(self.horizontalLayout_3, 0, 0, 1, 1)
         self.frame_4 = QtWidgets.QFrame(parent=self.centralwidget)
@@ -211,18 +223,67 @@ class Ui_MainWindow(object):
         self.btnPreview.setCheckable(True)
         self.btnPreview.setObjectName("btnPreview")
         self.verticalLayout_4.addWidget(self.btnPreview)
-        self.label_elapsed_timer = QtWidgets.QLabel(parent=self.FadeStopInfoFrame)
+        self.groupBoxIntroControls = QtWidgets.QGroupBox(parent=self.FadeStopInfoFrame)
+        self.groupBoxIntroControls.setMinimumSize(QtCore.QSize(132, 46))
+        self.groupBoxIntroControls.setMaximumSize(QtCore.QSize(132, 46))
+        self.groupBoxIntroControls.setTitle("")
+        self.groupBoxIntroControls.setObjectName("groupBoxIntroControls")
+        self.btnPreviewStart = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewStart.setGeometry(QtCore.QRect(0, 0, 44, 23))
+        self.btnPreviewStart.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewStart.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewStart.setObjectName("btnPreviewStart")
+        self.btnIntroArm = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnIntroArm.setGeometry(QtCore.QRect(44, 0, 44, 23))
+        self.btnIntroArm.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnIntroArm.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnIntroArm.setCheckable(True)
+        self.btnIntroArm.setObjectName("btnIntroArm")
+        self.btnPreviewEnd = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewEnd.setGeometry(QtCore.QRect(88, 0, 44, 23))
+        self.btnPreviewEnd.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewEnd.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewEnd.setObjectName("btnPreviewEnd")
+        self.btnPreviewBack = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewBack.setGeometry(QtCore.QRect(0, 23, 44, 23))
+        self.btnPreviewBack.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewBack.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewBack.setObjectName("btnPreviewBack")
+        self.btnPreviewMark = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewMark.setGeometry(QtCore.QRect(44, 23, 44, 23))
+        self.btnPreviewMark.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewMark.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewMark.setObjectName("btnPreviewMark")
+        self.btnPreviewFwd = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewFwd.setGeometry(QtCore.QRect(88, 23, 44, 23))
+        self.btnPreviewFwd.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewFwd.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewFwd.setObjectName("btnPreviewFwd")
+        self.verticalLayout_4.addWidget(self.groupBoxIntroControls)
+        self.horizontalLayout.addWidget(self.FadeStopInfoFrame)
+        self.frame_intro = QtWidgets.QFrame(parent=self.InfoFooterFrame)
+        self.frame_intro.setMinimumSize(QtCore.QSize(152, 112))
+        self.frame_intro.setStyleSheet("")
+        self.frame_intro.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.frame_intro.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
+        self.frame_intro.setObjectName("frame_intro")
+        self.verticalLayout_9 = QtWidgets.QVBoxLayout(self.frame_intro)
+        self.verticalLayout_9.setObjectName("verticalLayout_9")
+        self.label_7 = QtWidgets.QLabel(parent=self.frame_intro)
+        self.label_7.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.label_7.setObjectName("label_7")
+        self.verticalLayout_9.addWidget(self.label_7)
+        self.label_intro_timer = QtWidgets.QLabel(parent=self.frame_intro)
         font = QtGui.QFont()
         font.setFamily("FreeSans")
-        font.setPointSize(18)
+        font.setPointSize(40)
         font.setBold(False)
         font.setWeight(50)
-        self.label_elapsed_timer.setFont(font)
+        self.label_intro_timer.setFont(font)
-        self.label_elapsed_timer.setStyleSheet("color: black;")
+        self.label_intro_timer.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
-        self.label_elapsed_timer.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.label_intro_timer.setObjectName("label_intro_timer")
-        self.label_elapsed_timer.setObjectName("label_elapsed_timer")
+        self.verticalLayout_9.addWidget(self.label_intro_timer)
-        self.verticalLayout_4.addWidget(self.label_elapsed_timer)
+        self.horizontalLayout.addWidget(self.frame_intro)
-        self.horizontalLayout.addWidget(self.FadeStopInfoFrame)
         self.frame_toggleplayed_3db = QtWidgets.QFrame(parent=self.InfoFooterFrame)
         self.frame_toggleplayed_3db.setMinimumSize(QtCore.QSize(152, 112))
         self.frame_toggleplayed_3db.setMaximumSize(QtCore.QSize(184, 16777215))
@@ -273,12 +334,13 @@ class Ui_MainWindow(object):
         self.frame_silent.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
         self.frame_silent.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
         self.frame_silent.setObjectName("frame_silent")
+        self.verticalLayout_7 = QtWidgets.QVBoxLayout(self.frame_silent)
+        self.verticalLayout_7.setObjectName("verticalLayout_7")
         self.label_5 = QtWidgets.QLabel(parent=self.frame_silent)
-        self.label_5.setGeometry(QtCore.QRect(10, 10, 45, 24))
         self.label_5.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
         self.label_5.setObjectName("label_5")
+        self.verticalLayout_7.addWidget(self.label_5)
         self.label_silent_timer = QtWidgets.QLabel(parent=self.frame_silent)
-        self.label_silent_timer.setGeometry(QtCore.QRect(10, 48, 132, 54))
         font = QtGui.QFont()
         font.setFamily("FreeSans")
         font.setPointSize(40)
@@ -287,6 +349,7 @@ class Ui_MainWindow(object):
         self.label_silent_timer.setFont(font)
         self.label_silent_timer.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
         self.label_silent_timer.setObjectName("label_silent_timer")
+        self.verticalLayout_7.addWidget(self.label_silent_timer)
         self.horizontalLayout.addWidget(self.frame_silent)
         self.widgetFadeVolume = PlotWidget(parent=self.InfoFooterFrame)
         sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Preferred, QtWidgets.QSizePolicy.Policy.Preferred)
@@ -299,7 +362,7 @@ class Ui_MainWindow(object):
         self.horizontalLayout.addWidget(self.widgetFadeVolume)
         self.frame = QtWidgets.QFrame(parent=self.InfoFooterFrame)
         self.frame.setMinimumSize(QtCore.QSize(151, 0))
-        self.frame.setMaximumSize(QtCore.QSize(151, 16777215))
+        self.frame.setMaximumSize(QtCore.QSize(151, 112))
         self.frame.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
         self.frame.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
         self.frame.setObjectName("frame")
@@ -343,7 +406,7 @@ class Ui_MainWindow(object):
         MainWindow.setStatusBar(self.statusbar)
         self.actionPlay_next = QtGui.QAction(parent=MainWindow)
         icon4 = QtGui.QIcon()
-        icon4.addPixmap(QtGui.QPixmap("app/ui/../../../../.designer/backup/icon-play.png"), QtGui.QIcon.Mode.Normal, QtGui.QIcon.State.Off)
+        icon4.addPixmap(QtGui.QPixmap("app/ui/../../../../../../.designer/backup/icon-play.png"), QtGui.QIcon.Mode.Normal, QtGui.QIcon.State.Off)
         self.actionPlay_next.setIcon(icon4)
         self.actionPlay_next.setObjectName("actionPlay_next")
         self.actionSkipToNext = QtGui.QAction(parent=MainWindow)
@@ -353,17 +416,17 @@ class Ui_MainWindow(object):
         self.actionSkipToNext.setObjectName("actionSkipToNext")
         self.actionInsertTrack = QtGui.QAction(parent=MainWindow)
         icon6 = QtGui.QIcon()
-        icon6.addPixmap(QtGui.QPixmap("app/ui/../../../../.designer/backup/icon_search_database.png"), QtGui.QIcon.Mode.Normal, QtGui.QIcon.State.Off)
+        icon6.addPixmap(QtGui.QPixmap("app/ui/../../../../../../.designer/backup/icon_search_database.png"), QtGui.QIcon.Mode.Normal, QtGui.QIcon.State.Off)
         self.actionInsertTrack.setIcon(icon6)
         self.actionInsertTrack.setObjectName("actionInsertTrack")
         self.actionAdd_file = QtGui.QAction(parent=MainWindow)
         icon7 = QtGui.QIcon()
-        icon7.addPixmap(QtGui.QPixmap("app/ui/../../../../.designer/backup/icon_open_file.png"), QtGui.QIcon.Mode.Normal, QtGui.QIcon.State.Off)
+        icon7.addPixmap(QtGui.QPixmap("app/ui/../../../../../../.designer/backup/icon_open_file.png"), QtGui.QIcon.Mode.Normal, QtGui.QIcon.State.Off)
         self.actionAdd_file.setIcon(icon7)
         self.actionAdd_file.setObjectName("actionAdd_file")
         self.actionFade = QtGui.QAction(parent=MainWindow)
         icon8 = QtGui.QIcon()
-        icon8.addPixmap(QtGui.QPixmap("app/ui/../../../../.designer/backup/icon-fade.png"), QtGui.QIcon.Mode.Normal, QtGui.QIcon.State.Off)
+        icon8.addPixmap(QtGui.QPixmap("app/ui/../../../../../../.designer/backup/icon-fade.png"), QtGui.QIcon.Mode.Normal, QtGui.QIcon.State.Off)
         self.actionFade.setIcon(icon8)
         self.actionFade.setObjectName("actionFade")
         self.actionStop = QtGui.QAction(parent=MainWindow)
@@ -517,8 +580,16 @@ class Ui_MainWindow(object):
         self.current_track_2.setText(_translate("MainWindow", "Current track:"))
         self.next_track_2.setText(_translate("MainWindow", "Next track:"))
         self.lblTOD.setText(_translate("MainWindow", "00:00:00"))
-        self.btnPreview.setText(_translate("MainWindow", "  Preview"))
         self.label_elapsed_timer.setText(_translate("MainWindow", "00:00 / 00:00"))
+        self.btnPreview.setText(_translate("MainWindow", "  Preview"))
+        self.btnPreviewStart.setText(_translate("MainWindow", "<<"))
+        self.btnIntroArm.setText(_translate("MainWindow", "o"))
+        self.btnPreviewEnd.setText(_translate("MainWindow", ">>"))
+        self.btnPreviewBack.setText(_translate("MainWindow", "<"))
+        self.btnPreviewMark.setText(_translate("MainWindow", "*"))
+        self.btnPreviewFwd.setText(_translate("MainWindow", ">"))
+        self.label_7.setText(_translate("MainWindow", "Intro"))
+        self.label_intro_timer.setText(_translate("MainWindow", "0:0"))
         self.btnDrop3db.setText(_translate("MainWindow", "-3dB to talk"))
         self.btnHidePlayed.setText(_translate("MainWindow", "Hide played"))
         self.label_4.setText(_translate("MainWindow", "Fade"))