python: update python examples to modern python, Gst, and Glib versions

[experiments/gstreamer.git] / python / gst-trick-mode-looping-3.py

diff --git a/python/gst-trick-mode-looping-3.py b/python/gst-trick-mode-looping-3.py
index 6b406ea..cb9d8da 100755 (executable)
--- a/python/gst-trick-mode-looping-3.py
+++ b/python/gst-trick-mode-looping-3.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # A simple "trick-mode" looping player.
 # Version 3, based on segment seeking.
@@ -16,8 +16,7 @@ gi.require_version('Gst', '1.0')
 from gi.repository import Gst
 Gst.init(None)
 
-from gi.repository import GObject
-GObject.threads_init()
+from gi.repository import GLib
 
 
 class Player:
@@ -35,7 +34,7 @@ class Player:
 
     def run(self):
         self._player.set_state(Gst.State.PLAYING)
-        self.loop = GObject.MainLoop()
+        self.loop = GLib.MainLoop()
         self.loop.run()
 
     def quit(self):
@@ -43,38 +42,51 @@ class Player:
         self.loop.quit()
 
     def on_segment_done(self, bus, msg):
-        self._player.seek(self._rate, Gst.Format.TIME,
-                          Gst.SeekFlags.SEGMENT | Gst.SeekFlags.SKIP | Gst.SeekFlags.ACCURATE,
-                          Gst.SeekType.SET, 0,
-                          Gst.SeekType.END, 0)
+        self.set_seek(0)
 
     def on_error(self, bus, msg):
         (err, debug) = msg.parse_error()
-        print "Error: %s" % err, debug
+        print("Error: %s" % err, debug)
         self.quit()
 
     def on_state_changed(self, bus, msg):
         if msg.src != self._player:
             return
 
-        print 'on_state_changed'
+        print('on_state_changed')
         old_state, new_state, pending = msg.parse_state_changed()
-        print "%s -> %s" % (old_state, new_state)
+        print("%s -> %s" % (old_state, new_state))
         if old_state == Gst.State.READY and new_state == Gst.State.PAUSED:
             self.set_rate(self._rate)
 
     def set_rate(self, rate):
         self._rate = rate
+        self.set_seek(0, True)
 
-        if rate == 0:
-            self._player.set_state(Gst.State.PAUSED)
+    def set_seek(self, position, flush=False):
+        flags = Gst.SeekFlags.SEGMENT | Gst.SeekFlags.SKIP | Gst.SeekFlags.ACCURATE
+
+        if flush:
+            flags |= Gst.SeekFlags.FLUSH
+
+        if self._rate >= 0:
+            seek_event = Gst.Event.new_seek(self._rate,
+                                            Gst.Format.TIME,
+                                            flags,
+                                            Gst.SeekType.SET, position,
+                                            Gst.SeekType.NONE, 0)
+        else:
+            seek_event = Gst.Event.new_seek(self._rate,
+                                            Gst.Format.TIME,
+                                            flags,
+                                            Gst.SeekType.NONE, 0,
+                                            Gst.SeekType.END, position)
+
+        if seek_event:
+            self._player.send_event(seek_event)
+            Gst.info("rate set to %s" % self._rate)
         else:
-            self._player.set_state(Gst.State.PLAYING)
-            self._player.seek(rate,
-                              Gst.Format.TIME,
-                              Gst.SeekFlags.SEGMENT | Gst.SeekFlags.SKIP | Gst.SeekFlags.FLUSH | Gst.SeekFlags.ACCURATE,
-                              Gst.SeekType.SET, 0,
-                              Gst.SeekType.END, 0)
+            Gst.warining("change rate failed")
 
 
 def main(args):