* task.py:

Better logging when scheduling.
	* gstreamer.py:
	  If paused() returns True, don't go to playing.
	  add a method for querying duration in the common case.

morituri/extern/task/ChangeLog

@@ -1,3 +1,11 @@
+2011-08-15  Thomas Vander Stichele  <thomas at apestaart dot org>
+
+	* task.py:
+	  Better logging when scheduling.
+	* gstreamer.py:
+	  If paused() returns True, don't go to playing.
+	  add a method for querying duration in the common case.
+
 2011-08-08  Thomas Vander Stichele  <thomas at apestaart dot org>
 
 	* task.py:

morituri/extern/task/gstreamer.py

@@ -96,12 +96,18 @@ class GstPipelineTask(task.Task):
         ret = self.pipeline.get_state()
         self.debug('got pipeline to PAUSED: %r', ret)
 
+        # GStreamer tasks could already be done in paused, and not
+        # need playing.
         if not self.exception:
-            self.paused()
+            done = self.paused()
         else:
             raise self.exception
 
-        self.play()
+        if done:
+            self.debug('paused() is done')
+        else:
+            self.debug('paused() wants more')
+            self.play()
 
     def play(self):
         # since set_state returns non-False, adding it as timeout_add
@@ -121,12 +127,13 @@ class GstPipelineTask(task.Task):
             return False
 
         if self.playing:
-            self.debug('scheduling setting pipeline to PLAYING')
+            self.debug('schedule playLater()')
             self.schedule(0, playLater)
 
     def stop(self):
         self.debug('stopping')
 
+
         # FIXME: in theory this should help clean up properly,
         # but in practice we can still get
         # python: /builddir/build/BUILD/Python-2.7/Python/pystate.c:595: PyGILState_Ensure: Assertion `autoInterpreterState' failed.
@@ -167,7 +174,10 @@ class GstPipelineTask(task.Task):
 
     def paused(self):
         """
-        Called after pipeline is paused
+        Called after pipeline is paused.
+
+        If this returns True, the task is done and
+        should not continue going to PLAYING.
         """
         pass
 
@@ -202,3 +212,29 @@ class GstPipelineTask(task.Task):
         self.setAndRaiseException(exc)
         self.debug('error, scheduling stop')
         self.schedule(0, self.stop)
+
+    def query_length(self, element):
+        """
+        Query the length of the pipeline in samples, for progress updates.
+        To be called from paused()
+        """
+        # get duration
+        self.debug('query duration')
+        try:
+            duration, qformat = element.query_duration(self.gst.FORMAT_DEFAULT)
+        except self.gst.QueryError, e:
+            self.setException(e)
+            # schedule it, otherwise runner can get set to None before
+            # we're done starting
+            self.schedule(0, self.stop)
+            return
+
+        # wavparse 0.10.14 returns in bytes
+        if qformat == self.gst.FORMAT_BYTES:
+            self.debug('query returned in BYTES format')
+            duration /= 4
+        self.debug('total duration: %r', duration)
+
+        return duration
+
+

morituri/extern/task/task.py

@@ -148,6 +148,7 @@ class Task(object):
             print 'ERROR: stopping task which is already stopped'
             import traceback; traceback.print_stack()
         self.runner = None
+        self.debug('reset runner to None')
         self._notifyListeners('stopped')
 
     ### base class methods
@@ -205,6 +206,10 @@ class Task(object):
             exception, self.exceptionMessage))
 
     def schedule(self, delta, callable, *args, **kwargs):
+        if not self.runner:
+            print "ERROR: scheduling on a task that's altready stopped"
+            import traceback; traceback.print_stack()
+            return
         self.runner.schedule(self, delta, callable, *args, **kwargs)
 
 
@@ -511,6 +516,8 @@ class SyncRunner(TaskRunner, ITaskListener):
     def schedule(self, task, delta, callable, *args, **kwargs):
         def c():
             try:
+                self.log('schedule: calling %r(*args=%r, **kwargs=%r)',
+                    callable, args, kwargs)
                 callable(*args, **kwargs)
                 return False
             except Exception, e:
@@ -519,6 +526,9 @@ class SyncRunner(TaskRunner, ITaskListener):
                 task.setException(e)
                 self.stopped(task)
                 raise
+        self.log('schedule: scheduling %r(*args=%r, **kwargs=%r)',
+            callable, args, kwargs)
+
         gobject.timeout_add(int(delta * 1000L), c)
 
     ### ITaskListener methods