Commit ed1c9866 authored by Thibault Saunier's avatar Thibault Saunier 🌵

Add an example sink element and override the chain and event functions of pads

Otherwize we will get 2 time acces to the element in it, which does
not make much sense. The _full variant can still be used.
parent 367d281a
#!/usr/bin/env python
# -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4
# sinkelement.py
# (c) 2005 Edward Hervey <edward@fluendo.com>
# (c) 2007 Jan Schmidt <jan@fluendo.com>
# Licensed under LGPL
#
# Small test application to show how to write a sink element
# in 20 lines in python and place into the gstreamer registry
# so it can be autoplugged or used from parse_launch.
#
# Run this script with GST_DEBUG=python:5 to see the debug
# messages
from gi.repository import Gst, GObject
#
# Simple Sink element created entirely in python
#
class MySink(Gst.Element):
__gstmetadata__ = ('CustomSink','Sink', \
'Custom test sink element', 'Edward Hervey')
__gsttemplates__ = Gst.PadTemplate.new ("sinkpadtemplate",
Gst.PadDirection.SINK,
Gst.PadPresence.ALWAYS,
Gst.Caps.new_any())
def __init__(self):
Gst.Element.__init__(self)
Gst.info('creating sinkpad')
self.sinkpad = Gst.Pad.new_from_template(self.__gsttemplates__, "sink")
Gst.info('adding sinkpad to self')
self.add_pad(self.sinkpad)
Gst.info('setting chain/event functions')
self.sinkpad.set_chain_function(self.chainfunc)
self.sinkpad.set_event_function(self.eventfunc)
st = Gst.Structure.from_string("yes,fps=1/2")[0]
def chainfunc(self, pad, buffer):
Gst.info("%s timestamp(buffer):%d" % (pad, buffer.pts))
return Gst.FlowReturn.OK
def eventfunc(self, pad, event):
Gst.info("%s event:%r" % (pad, event.type))
return True
GObject.type_register(MySink)
__gstelementfactory__ = ("mysink", Gst.Rank.NONE, MySink)
......@@ -96,6 +96,24 @@ Caps = override(Caps)
__all__.append('Caps')
class Pad(Gst.Pad):
def __init__(self):
self._real_chain_func = None
self._real_event_func = None
def _chain_override(self, pad, parent, buf):
return self._real_chain_func(pad, buf)
def _event_override(self, pad, parent, buf):
return self._real_event_func(pad, buf)
def set_chain_function(self, func):
self._real_chain_func = func
self.set_chain_function_full(self._chain_override, None)
def set_event_function(self, func):
self._real_event_func = func
self.set_event_function_full(self._event_override, None)
def query_caps(self, filter=None):
return Gst.Pad.query_caps(self, filter)
......
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