From 1f4c3914e248950951f43e8feebde979c9b67979 Mon Sep 17 00:00:00 2001
From: Guillaume Pellerin <yomguy@parisson.com>
Date: Tue, 23 Jul 2013 00:40:15 +0200
Subject: [PATCH] update player with pads (thanks to yokamaru
 https://gist.github.com/yokamaru/850506)

---
 audio_player_osc.py | 112 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 99 insertions(+), 13 deletions(-)

diff --git a/audio_player_osc.py b/audio_player_osc.py
index 609882c..ec6d6f3 100644
--- a/audio_player_osc.py
+++ b/audio_player_osc.py
@@ -1,3 +1,27 @@
+#!/usr/bin/env python
+#
+# Based on:
+# decodebin.py - Audio autopluging example using 'decodebin' element
+# Copyright (C) 2006 Jason Gerard DeRose <jderose@jasonderose.org>
+# Copyright (C) 2006 yokamaru https://gist.github.com/yokamaru/850506
+# Copyright (C) 2013 Guillaume Pellerin
+
+# 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., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+
 
 import gobject
 gobject.threads_init()
@@ -8,6 +32,7 @@ from threading import Thread
 import sys
 import liblo
 
+
 class OSCController(Thread):
 
     def __init__(self, port):
@@ -19,6 +44,9 @@ class OSCController(Thread):
         except liblo.ServerError, err:
             print str(err)
 
+    def add_method(self, path, type, method):
+        self.server.add_method(path, type, method)
+
     def run(self):
         while True:
             self.server.recv(100)
@@ -28,30 +56,88 @@ class AudioPlayer(Thread):
     
     def __init__(self, uri):
         Thread.__init__(self)
+        
         self.uri = uri
+        
+        # The controller
         self.controller = OSCController(12345)
-        self.controller.server.add_method('/play', 'i', self.play_stop_cb)
+        self.controller.add_method('/play', 'i', self.play_stop_cb)
         self.controller.start()
-        
+ 
+        # 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.srcdec = gst.element_factory_make('uridecodebin')
+        self.conv = gst.element_factory_make('audioconvert')
+        self.rsmpl = gst.element_factory_make('audioresample')
+        self.sink = gst.element_factory_make('alsasink')
+ 
+        # Set 'uri' property on uridecodebin
+        self.srcdec.set_property('uri', self.uri)
+ 
+        # Connect handler for 'pad-added' signal
+        self.srcdec.connect('pad-added', self.on_pad_added)
+ 
+        # Add elements to pipeline
+        self.pipeline.add(self.srcdec, self.conv, self.rsmpl, self.sink)
+ 
+        # Link *some* elements
+        # This is completed in self.on_new_decoded_pad()
+        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()
-        self.player = gst.element_factory_make("playbin", "player")
-        self.player.set_property('uri', self.uri)
-        
+ 
+ 
+    def on_pad_added(self, element, pad):
+        caps = pad.get_caps()
+        name = caps[0].get_name()
+        #print 'on_pad_added:', 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.pipeline.set_state(gst.STATE_NULL)
+        #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()
+ 
     def play_stop_cb(self, path, value):
         value = value[0]
         if value:
-            print 'play'
-            self.player.set_state(gst.STATE_NULL)
-            self.player.set_state(gst.STATE_PLAYING)
+            self.pipeline.set_state(gst.STATE_NULL)
+            self.pipeline.set_state(gst.STATE_PLAYING)
         else:
-            print 'stop'
-            self.player.set_state(gst.STATE_NULL)
+            self.pipeline.set_state(gst.STATE_NULL)
             
     def run(self):
         self.mainloop.run()
-    
+
+        
 if __name__ == '__main__':
-    path = sys.argv[-1]
-    player = AudioPlayer(path)
+    uri = sys.argv[-1]
+    player = AudioPlayer(uri)
     player.start()
     
-- 
2.39.5