Update

subprojects/gst-python/old_examples/decodebin.py

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+#!/usr/bin/env python
+
+# decodebin.py - Audio autopluging example using 'decodebin' element
+# Copyright (C) 2006 Jason Gerard DeRose <jderose@jasonderose.org>
+
+# 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.
+
+import sys
+
+import gobject
+gobject.threads_init()
+
+import pygst
+pygst.require('0.10')
+import gst
+
+
+class Decodebin:
+	def __init__(self, location):
+		# The pipeline
+		self.pipeline = gst.Pipeline()
+		
+		# Create bus and connect several handlers
+		self.bus = self.pipeline.get_bus()
+		self.bus.add_signal_watch()
+		self.bus.connect('message::eos', self.on_eos)
+		self.bus.connect('message::tag', self.on_tag)
+		self.bus.connect('message::error', self.on_error)
+
+		# Create elements
+		self.src = gst.element_factory_make('filesrc')
+		self.dec = gst.element_factory_make('decodebin')
+		self.conv = gst.element_factory_make('audioconvert')
+		self.rsmpl = gst.element_factory_make('audioresample')
+		self.sink = gst.element_factory_make('alsasink')
+		
+		# Set 'location' property on filesrc
+		self.src.set_property('location', location)
+		
+		# Connect handler for 'new-decoded-pad' signal 
+		self.dec.connect('new-decoded-pad', self.on_new_decoded_pad)
+		
+		# Add elements to pipeline
+		self.pipeline.add(self.src, self.dec, self.conv, self.rsmpl, self.sink)
+		
+		# Link *some* elements 
+		# This is completed in self.on_new_decoded_pad()
+		self.src.link(self.dec)
+		gst.element_link_many(self.conv, self.rsmpl, self.sink)
+		
+		# Reference used in self.on_new_decoded_pad()
+		self.apad = self.conv.get_pad('sink')
+
+		# The MainLoop
+		self.mainloop = gobject.MainLoop()
+
+		# And off we go!
+		self.pipeline.set_state(gst.STATE_PLAYING)
+		self.mainloop.run()
+		
+		
+	def on_new_decoded_pad(self, element, pad, last):
+		caps = pad.get_caps()
+		name = caps[0].get_name()
+		print 'on_new_decoded_pad:', name
+		if name == 'audio/x-raw-float' or name == 'audio/x-raw-int':
+			if not self.apad.is_linked(): # Only link once
+				pad.link(self.apad)
+			
+			
+	def on_eos(self, bus, msg):
+		print 'on_eos'
+		self.mainloop.quit()
+		
+		
+	def on_tag(self, bus, msg):
+		taglist = msg.parse_tag()
+		print 'on_tag:'
+		for key in taglist.keys():
+			print '\t%s = %s' % (key, taglist[key])
+			
+			
+	def on_error(self, bus, msg):
+		error = msg.parse_error()
+		print 'on_error:', error[1]
+		self.mainloop.quit()
+
+
+
+
+
+if __name__ == '__main__':
+	if len(sys.argv) == 2:
+		Decodebin(sys.argv[1])
+	else:
+		print 'Usage: %s /path/to/media/file' % sys.argv[0]