- Gstreamer, for its advanced pipeline features and active community;
- Python, for its agility;
- Qt, for its native feel on different platforms and
- Mac OSX, to start with, because of its usability.
'''
Author: Sjoerd Op 't Land
Date: 30 October 2009
Sources:
http://ooboontoo.blogspot.com/2008/03/gstreamer-with-python-in-qt-learning-by.html
http://faq.pygtk.org/index.py?req=show&file=faq23.038.htp
http://doc.trolltech.com/4.5/qmaccocoaviewcontainer.html#details
Prerequisites (MacPort ports):
gstreamer
gst-plugins-base
gst-plugins-good
python_select (use to select Python 2.6 with "sudo python_select python26")
py26-pyqt4
py26-gst-python
gst-plugins-ugly
py26-pyobjc2-cocoa
'''
from PyQt4 import QtCore, QtGui # Qt bindings
import sys
import gst # gstreamer bindings
import Foundation # PyObjC bindings for Foundations framework
class TestMonitor(QtGui.QDialog):
def __init__(self, parent=None):
super(TestMonitor, self).__init__(parent)
layout = QtGui.QVBoxLayout(self)
self.label = QtGui.QLabel()
self.label.setText("SMPTE Color Bars with snow")
layout.addWidget(self.label)
self.player = gst.Pipeline("player")
self.source = gst.element_factory_make("videotestsrc","testsrc")
self.sink = gst.element_factory_make("osxvideosink","videosink")
self.player.add(self.source,self.sink)
gst.element_link_many(self.source,self.sink)
bus = gst.Pipeline.get_bus(self.player)
self.player.set_state(gst.STATE_PLAYING)
self.nsview = None
while self.nsview == None:
messagePoll = bus.poll(gst.MESSAGE_ANY,1000000000)
if messagePoll:
if messagePoll.structure and messagePoll.structure.has_key("nsview"):
print messagePoll.structure["nsview"]
# use a dirty hack to obtain the address of this gpointer
#TODO: make sure this also works on 64-bit systems
pointerAddress = int(str(messagePoll.structure["nsview"])[13:-1],16)
self.nsview = pointerAddress
# Pushing an NSAutoreleasePool on the stack is necessary to suppress
# leakage error messages. However, I'm not convinces that leakage is
# really avoided, this way.
#TODO: check for memory leaks
pool = Foundation.NSAutoreleasePool.alloc().init()
self.viewer = QtGui.QMacCocoaViewContainer(self.nsview,self)
del pool
self.viewer.setMinimumSize(320,240)
layout.addWidget(self.viewer)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
testmonitor = TestMonitor()
testmonitor.show()
app.exec_()
- Make this cross-platform
- Check for memory leaks
- Do this in a threaded way
