[pitivi] SingleDecodeBin: Cache globally the list of usable gst.ElementFactory

[Edward Hervey <edwardrv src gnome org>]

commit a166633f81052b2a003fcfb40375e92ff736c456
Author: Edward Hervey <bilboed bilboed com>
Date:   Fri Sep 4 15:59:58 2009 +0200

    SingleDecodeBin: Cache globally the list of usable gst.ElementFactory
    
    Otherwise this list gets recomputed/stored for every single instance of
    singledecodebin used in the pitivi.
    
    This is a speed and memory optimization.

 pitivi/elements/singledecodebin.py |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/elements/singledecodebin.py b/pitivi/elements/singledecodebin.py
index 5399bca..b0eec7d 100644
--- a/pitivi/elements/singledecodebin.py
+++ b/pitivi/elements/singledecodebin.py
@@ -56,6 +56,9 @@ class SingleDecodeBin(gst.Bin):
                          gst.PAD_SOMETIMES,
                          gst.caps_new_any())
         )
+
+    _factories = []
+
     def __init__(self, caps=None, uri=None, stream=None, *args, **kwargs):
         gst.Bin.__init__(self, *args, **kwargs)
         if not caps:
@@ -88,7 +91,8 @@ class SingleDecodeBin(gst.Bin):
 
         self._validelements = [] #added elements
 
-        self._factories = self._getSortedFactoryList()
+        if self._factories == []:
+            self._factories = self._getSortedFactoryList()
 
         self.debug("stream:%r" % self.stream)
 
@@ -108,6 +112,7 @@ class SingleDecodeBin(gst.Bin):
         Returns the list of demuxers, decoders and parsers available, sorted
         by rank
         """
+        self.debug("getting factory list")
         def _myfilter(fact):
             if fact.get_rank() < 64 :
                 return False