libsaria: Began implementing better callback system

The event system was evil, hard to use, and hard to follow.  This patch
is the beginning of a new, more straightforward system.

libsaria/audio/__init__.py

@@ -1,8 +1,10 @@
 # Bryan Schumake (8/7/2010)
 
+import gst
 import datetime
 import threading
 import pipeline
+from libsaria import callbacks
 
 timedelta    = datetime.timedelta
 audio_lock   = threading.Lock()
@@ -24,15 +26,15 @@ def get_state():
 def is_playing():
 	return get_state() == gst.STATE_PLAYING
 
-#def do_notify_playing():
-#	if get_state() == gst.STATE_PLAYING:
-#		callback.play()
+def do_notify_playing():
+	if get_state() == gst.STATE_PLAYING:
+		callbacks.play()
 
 def play():
 	lock_audio()
 	pipeline.play()
 	unlock_audio()
-	#do_notify_playing()
+	do_notify_playing()
 
 #def do_notify_paused():
 #	if get_state() == gst.STATE_PAUSED:

libsaria/callbacks.py

@@ -0,0 +1,8 @@
+# Bryan Schumaker (4 / 30 / 2011)
+
+def null_cb(*args):
+	pass
+
+on_play = null_cb
+def play():
+	on_play()

libsaria/controls.py

@@ -62,7 +62,7 @@ def next():
 	return call("NEXT", pick_next)
 
 def play():
-	return call("PLAY", audio.play)
+	audio.play()
 
 def pause():
 	return call("PAUSE", audio.pause)

libsaria/threads.py

@@ -15,7 +15,9 @@ class BG_Thread(Thread):
 		self.func = func
 		self.args = args
 	def run(self):
+		print "running func %s with args %s" % (self.func, self.args)
 		self.func(*self.args)
+		print "exiting func %s" % self.func
 
 
 def background(func, *args):

ocarina/__init__.py

@@ -6,11 +6,11 @@ __start__ = now()
 
 import gtk
 import gobject
-import libsaria
-
-__vers__  = "Ocarina %s" % libsaria.__vstr__
 gobject.threads_init()
 
+import libsaria
+__vers__  = "Ocarina %s" % libsaria.__vstr__
+
 def uptime():
 	return now() - __start__
 
@@ -18,6 +18,8 @@ def quit(window, event):
 	gtk.main_quit()
 	libsaria.shutdown()
 	print "Ocarina ran for:", uptime()
+	import threading
+	print "active threads?", threading.active_count()
 
 import window
 import playlist

ocarina/callbacks.py

@@ -4,6 +4,7 @@ import libsaria
 import queue
 from ocarina import body
 from ocarina.body import footer
+from libsaria import callbacks
 import playlist
 import library
 
@@ -11,7 +12,7 @@ invite = libsaria.event.invite
 
 def on_play(*args):
 	footer.on_play()
-invite("POSTPLAY", on_play)
+callbacks.on_play = on_play
 
 def on_pause(*args):
 	footer.on_pause()