[vlc-commits] Add python-qt5 example

[Saveliy]

vlc/python | branch: master | Saveliy <saveliy.m.yusufov at gmail.com> | Wed Dec 26 12:54:26 2018 -0500| [60aa8ea5763a3f93829b5bbaabb6c1011994b2a2] | committer: Olivier Aubert

Add python-qt5 example


> http://git.videolan.org/gitweb.cgi/vlc/python.git/?a=commit;h=60aa8ea5763a3f93829b5bbaabb6c1011994b2a2
---

 examples/pyqt5vlc.py | 205 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 205 insertions(+)

diff --git a/examples/pyqt5vlc.py b/examples/pyqt5vlc.py
new file mode 100644
index 0000000..abf0cf2
--- /dev/null
+++ b/examples/pyqt5vlc.py
@@ -0,0 +1,205 @@
+"""
+A simple example for VLC python bindings using PyQt5.
+
+Author: Saveliy Yusufov, Columbia University, sy2685 at columbia.edu
+Date: 25 December 2018
+"""
+
+import platform
+import os
+import sys
+
+from PyQt5 import QtWidgets, QtGui, QtCore
+import vlc
+
+class Player(QtWidgets.QMainWindow):
+    """A simple Media Player using VLC and Qt
+    """
+
+    def __init__(self, master=None):
+        QtWidgets.QMainWindow.__init__(self, master)
+        self.setWindowTitle("Media Player")
+
+        # Create a basic vlc instance
+        self.instance = vlc.Instance()
+
+        self.media = None
+
+        # Create an empty vlc media player
+        self.mediaplayer = self.instance.media_player_new()
+
+        self.create_ui()
+        self.is_paused = False
+
+    def create_ui(self):
+        """Set up the user interface, signals & slots
+        """
+        self.widget = QtWidgets.QWidget(self)
+        self.setCentralWidget(self.widget)
+
+        # In this widget, the video will be drawn
+        if platform.system() == "Darwin": # for MacOS
+            self.videoframe = QtWidgets.QMacCocoaViewContainer(0)
+        else:
+            self.videoframe = QtWidgets.QFrame()
+
+        self.palette = self.videoframe.palette()
+        self.palette.setColor(QtGui.QPalette.Window, QtGui.QColor(0, 0, 0))
+        self.videoframe.setPalette(self.palette)
+        self.videoframe.setAutoFillBackground(True)
+
+        self.positionslider = QtWidgets.QSlider(QtCore.Qt.Horizontal, self)
+        self.positionslider.setToolTip("Position")
+        self.positionslider.setMaximum(1000)
+        self.positionslider.sliderMoved.connect(self.set_position)
+        self.positionslider.sliderPressed.connect(self.set_position)
+
+        self.hbuttonbox = QtWidgets.QHBoxLayout()
+        self.playbutton = QtWidgets.QPushButton("Play")
+        self.hbuttonbox.addWidget(self.playbutton)
+        self.playbutton.clicked.connect(self.play_pause)
+
+        self.stopbutton = QtWidgets.QPushButton("Stop")
+        self.hbuttonbox.addWidget(self.stopbutton)
+        self.stopbutton.clicked.connect(self.stop)
+
+        self.hbuttonbox.addStretch(1)
+        self.volumeslider = QtWidgets.QSlider(QtCore.Qt.Horizontal, self)
+        self.volumeslider.setMaximum(100)
+        self.volumeslider.setValue(self.mediaplayer.audio_get_volume())
+        self.volumeslider.setToolTip("Volume")
+        self.hbuttonbox.addWidget(self.volumeslider)
+        self.volumeslider.valueChanged.connect(self.set_volume)
+
+        self.vboxlayout = QtWidgets.QVBoxLayout()
+        self.vboxlayout.addWidget(self.videoframe)
+        self.vboxlayout.addWidget(self.positionslider)
+        self.vboxlayout.addLayout(self.hbuttonbox)
+
+        self.widget.setLayout(self.vboxlayout)
+
+        menu_bar = self.menuBar()
+
+        # File menu
+        file_menu = menu_bar.addMenu("File")
+
+        # Add actions to file menu
+        open_action = QtWidgets.QAction("Load Video", self)
+        close_action = QtWidgets.QAction("Close App", self)
+        file_menu.addAction(open_action)
+        file_menu.addAction(close_action)
+
+        open_action.triggered.connect(self.open_file)
+        close_action.triggered.connect(sys.exit)
+
+        self.timer = QtCore.QTimer(self)
+        self.timer.setInterval(100)
+        self.timer.timeout.connect(self.update_ui)
+
+    def play_pause(self):
+        """Toggle play/pause status
+        """
+        if self.mediaplayer.is_playing():
+            self.mediaplayer.pause()
+            self.playbutton.setText("Play")
+            self.is_paused = True
+            self.timer.stop()
+        else:
+            if self.mediaplayer.play() == -1:
+                self.open_file()
+                return
+
+            self.mediaplayer.play()
+            self.playbutton.setText("Pause")
+            self.timer.start()
+            self.is_paused = False
+
+    def stop(self):
+        """Stop player
+        """
+        self.mediaplayer.stop()
+        self.playbutton.setText("Play")
+
+    def open_file(self):
+        """Open a media file in a MediaPlayer
+        """
+
+        dialog_txt = "Choose Media File"
+        filename = QtWidgets.QFileDialog.getOpenFileName(self, dialog_txt, os.path.expanduser('~'))
+        if not filename:
+            return
+
+        # getOpenFileName returns a tuple, so use only the actual file name
+        self.media = self.instance.media_new(filename[0])
+
+        # Put the media in the media player
+        self.mediaplayer.set_media(self.media)
+
+        # Parse the metadata of the file
+        self.media.parse()
+
+        # Set the title of the track as window title
+        self.setWindowTitle(self.media.get_meta(0))
+
+        # The media player has to be 'connected' to the QFrame (otherwise the
+        # video would be displayed in it's own window). This is platform
+        # specific, so we must give the ID of the QFrame (or similar object) to
+        # vlc. Different platforms have different functions for this
+        if platform.system() == "Linux": # for Linux using the X Server
+            self.mediaplayer.set_xwindow(int(self.videoframe.winId()))
+        elif platform.system() == "Windows": # for Windows
+            self.mediaplayer.set_hwnd(int(self.videoframe.winId()))
+        elif platform.system() == "Darwin": # for MacOS
+            self.mediaplayer.set_nsobject(int(self.videoframe.winId()))
+
+        self.play_pause()
+
+    def set_volume(self, volume):
+        """Set the volume
+        """
+        self.mediaplayer.audio_set_volume(volume)
+
+    def set_position(self):
+        """Set the movie position according to the position slider.
+        """
+
+        # The vlc MediaPlayer needs a float value between 0 and 1, Qt uses
+        # integer variables, so you need a factor; the higher the factor, the
+        # more precise are the results (1000 should suffice).
+
+        # Set the media position to where the slider was dragged
+        self.timer.stop()
+        pos = self.positionslider.value()
+        self.mediaplayer.set_position(pos / 1000.0)
+        self.timer.start()
+
+    def update_ui(self):
+        """Updates the user interface"""
+
+        # Set the slider's position to its corresponding media position
+        # Note that the setValue function only takes values of type int,
+        # so we must first convert the corresponding media position.
+        media_pos = int(self.mediaplayer.get_position() * 1000)
+        self.positionslider.setValue(media_pos)
+
+        # No need to call this function if nothing is played
+        if not self.mediaplayer.is_playing():
+            self.timer.stop()
+
+            # After the video finished, the play button stills shows "Pause",
+            # which is not the desired behavior of a media player.
+            # This fixes that "bug".
+            if not self.is_paused:
+                self.stop()
+
+def main():
+    """Entry point for our simple vlc player
+    """
+    app = QtWidgets.QApplication(sys.argv)
+    player = Player()
+    player.show()
+    player.resize(640, 480)
+    sys.exit(app.exec_())
+
+if __name__ == "__main__":
+    main()