Fixed a few things:

Added a... not very ugly hack to clean zombie processes left behind by
audiotools.
Added an import statement at top of bootstrap
Added a hooking method to the Collector in garbage

audio/files.py

@@ -18,6 +18,15 @@ def collect(self):
             self.item._reader.close()
         except (audiotools.DecodingError):
             pass
+        # Hack to kill zombies below
+        import gc, subprocess
+        try:
+            [item.poll() for item in gc.get_referrers(subprocess.Popen)
+             if isinstance(item, subprocess.Popen)]
+        except:
+            logger.warning("Exception occured in hack.")
+        # Hack to kill zombies above
+
         return True
 
 

bootstrap.py

@@ -1,5 +1,6 @@
 import config
 import logging
+import time
 
 logging.getLogger().setLevel(config.loglevel)
 

garbage/__init__.py

@@ -19,10 +19,12 @@ def __call__(mcs, *args, **kw):
 
 class Collector(object):
     __metaclass__ = Singleton
+    _hooks = list()
     def __init__(self):
         super(Collector, self).__init__()
         self.items = set()
 
+
         self.collecting = threading.Event()
         self.thread = threading.Thread(target=self.run,
                                        name="Garbage Collection Thread")
@@ -31,7 +33,12 @@ def __init__(self):
 
     def add(self, garbage):
         self.items.add(garbage)
-
+        for hook in self._hooks:
+            try:
+                hook(garbage)
+            except:
+                logger.exception("Hook function exception.")
+
     def run(self):
         while not self.collecting.is_set():
             removal = set()
@@ -51,6 +58,9 @@ def info(self):
         about current pending garbage."""
         yield None # Not implemented
 
+    @classmethod
+    def add_hook(cls, hook):
+        cls._hooks.append(hook)
 
 class Garbage(object):
     collector = Collector()