Update

subprojects/gst-python/old_examples/vumeter.py

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+#!/usr/bin/env python
+# -*- Mode: Python -*-
+# vi:si:et:sw=4:sts=4:ts=4
+
+# gst-python
+# Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Library General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Library General Public License for more details.
+#
+# You should have received a copy of the GNU Library General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+# Boston, MA 02110-1301, USA.
+
+
+# A test more of gst-plugins than of gst-python.
+
+
+import pygtk
+pygtk.require('2.0')
+import gtk
+import gobject
+
+import pygst
+pygst.require('0.10')
+import gst
+
+import fvumeter
+
+
+def clamp(x, min, max):
+    if x < min:
+        return min
+    elif x > max:
+        return max
+    return x
+
+
+class Window(gtk.Dialog):
+    def __init__(self):
+        gtk.Dialog.__init__(self, 'Volume Level')
+        self.prepare_ui()
+
+    def prepare_ui(self):
+        self.set_default_size(200,60)
+        self.set_title('Volume Level')
+        self.connect('delete-event', lambda *x: gtk.main_quit())
+        self.vus = []
+        self.vus.append(fvumeter.FVUMeter())
+        self.vus.append(fvumeter.FVUMeter())
+        self.vbox.add(self.vus[0])
+        self.vbox.add(self.vus[1])
+        self.vus[0].show()
+        self.vus[1].show()
+
+    def error(self, message, secondary=None):
+        m = gtk.MessageDialog(self,
+                              gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
+                              gtk.MESSAGE_ERROR,
+                              gtk.BUTTONS_OK,
+                              message)
+        if secondary:
+            m.format_secondary_text(secondary)
+        m.run()
+                              
+    def on_message(self, bus, message):
+        if  message.structure.get_name() == 'level':
+            s = message.structure
+            for i in range(0, len(s['peak'])):
+                self.vus[i].freeze_notify()
+                decay = clamp(s['decay'][i], -90.0, 0.0)
+                peak = clamp(s['peak'][i], -90.0, 0.0)
+                if peak > decay:
+                    print "ERROR: peak bigger than decay!"
+            
+                self.vus[i].set_property('decay', decay)
+                self.vus[i].set_property('peak', peak)
+        return True
+
+    def run(self):
+        try:
+            self.set_sensitive(False)
+            s = 'alsasrc ! level message=true ! fakesink'
+            pipeline = gst.parse_launch(s)
+            self.set_sensitive(True)
+            pipeline.get_bus().add_signal_watch()
+            i = pipeline.get_bus().connect('message::element', self.on_message)
+            pipeline.set_state(gst.STATE_PLAYING)
+            gtk.Dialog.run(self)
+            pipeline.get_bus().disconnect(i)
+            pipeline.get_bus().remove_signal_watch()
+            pipeline.set_state(gst.STATE_NULL)
+        except gobject.GError, e:
+            self.set_sensitive(True)
+            self.error('Could not create pipeline', e.__str__)
+        
+if __name__ == '__main__':
+    w = Window()
+    w.show_all()
+    w.run()