pitivi r1105 - in trunk: . pitivi/elements

[edwardrv svn gnome org]

Author: edwardrv
Date: Thu Jan 10 14:07:08 2008
New Revision: 1105
URL: http://svn.gnome.org/viewvc/pitivi?rev=1105&view=rev

Log:
* pitivi/elements/Makefile.am:
* pitivi/elements/videofade.py:
New fade-in/fade-out element. Only works with cvs gst-plugins-good.


Added:
   trunk/pitivi/elements/videofade.py
Modified:
   trunk/ChangeLog
   trunk/pitivi/elements/Makefile.am

Modified: trunk/pitivi/elements/Makefile.am
==============================================================================
--- trunk/pitivi/elements/Makefile.am	(original)
+++ trunk/pitivi/elements/Makefile.am	Thu Jan 10 14:07:08 2008
@@ -4,7 +4,8 @@
 	__init__.py \
 	singledecodebin.py \
 	smartscale.py	\
-	thumbnailsink.py
+	thumbnailsink.py \
+	videofade.py
 
 clean-local:
 	rm -rf *.pyc *.pyo

Added: trunk/pitivi/elements/videofade.py
==============================================================================
--- (empty file)
+++ trunk/pitivi/elements/videofade.py	Thu Jan 10 14:07:08 2008
@@ -0,0 +1,94 @@
+# PiTiVi , Non-linear video editor
+#
+#       pitivi/elements/videofade.py
+#
+# Copyright (c) 2008, Edward Hervey <bilboed bilboed com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This program 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+"""
+Simple video fade element
+"""
+
+import gobject
+import gst
+
+class VideoFade(gst.Bin):
+    """
+    Simple video fade element
+    """
+
+    def __init__(self, position=0, duration=2*gst.SECOND, fadefromblack=True):
+        gst.Bin.__init__(self)
+        self.incsp = gst.element_factory_make("ffmpegcolorspace", "incsp")
+        self.outcsp = gst.element_factory_make("ffmpegcolorspace", "outcsp")
+        self.alpha = gst.element_factory_make("alpha", "alpha")
+        self.vmix = gst.element_factory_make("videomixer", "videomix")
+        self.vmix.set_property("background", 1)
+        self.add(self.incsp, self.alpha, self.vmix, self.outcsp)
+        gst.element_link_many(self.incsp, self.alpha, self.vmix, self.outcsp)
+
+        self._sinkPad = gst.GhostPad("sink", self.incsp.get_pad("sink"))
+        self._sinkPad.set_active(True)
+        self._srcPad = gst.GhostPad("src", self.outcsp.get_pad("src"))
+        self._srcPad.set_active(True)
+
+        self.add_pad(self._sinkPad)
+        self.add_pad(self._srcPad)
+
+        self.startposition = position
+        self.duration = duration
+        self.fadefromblack = fadefromblack
+
+        self.alphacontrol = gst.Controller(self.alpha, "alpha")
+        self.alphacontrol.set_interpolation_mode("alpha", gst.INTERPOLATE_LINEAR)
+
+        self._resetControllerValues()
+
+    def setStartPosition(self, position):
+        if position == self.startposition:
+            return
+        self.startposition = position
+        self._resetControllerValues()
+
+    def setDuration(self, duration):
+        if self.duration == duration:
+            return
+        self.duration = duration
+        self._resetControllerValues()
+
+    def setFadeFromBlack(self, fromblack):
+        if self.fadefromblack == fromblack:
+            return
+        self.fadefromblack = fromblack
+        self._resetControllerValues()
+
+    def _resetControllerValues(self):
+        self.alphacontrol.unset_all("alpha")
+        if self.fadefromblack:
+            start = 0.0
+            stop = 1.0
+        else:
+            start = 1.0
+            stop = 0.0
+        self.alphacontrol.set("alpha",
+                              self.startposition,
+                              start)
+        self.alphacontrol.set("alpha",
+                              self.startposition + self.duration,
+                              stop)
+
+gobject.type_register(VideoFade)