gstreamer/old_examples/pyidentity.py

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#!/usr/bin/env python
import pygtk
pygtk.require ("2.0")
import gobject
gobject.threads_init()
import pygst
pygst.require('0.10')
import gst
class PyIdentity(gst.Element):
_sinkpadtemplate = gst.PadTemplate ("sink",
gst.PAD_SINK,
gst.PAD_ALWAYS,
gst.caps_new_any())
_srcpadtemplate = gst.PadTemplate ("src",
gst.PAD_SRC,
gst.PAD_ALWAYS,
gst.caps_new_any())
def __init__(self):
gst.Element.__init__(self)
self.sinkpad = gst.Pad(self._sinkpadtemplate, "sink")
self.sinkpad.set_chain_function(self.chainfunc)
self.sinkpad.set_event_function(self.eventfunc)
self.sinkpad.set_getcaps_function(gst.Pad.proxy_getcaps)
self.sinkpad.set_setcaps_function(gst.Pad.proxy_setcaps)
self.add_pad (self.sinkpad)
self.srcpad = gst.Pad(self._srcpadtemplate, "src")
self.srcpad.set_event_function(self.srceventfunc)
self.srcpad.set_query_function(self.srcqueryfunc)
self.srcpad.set_getcaps_function(gst.Pad.proxy_getcaps)
self.srcpad.set_setcaps_function(gst.Pad.proxy_setcaps)
self.add_pad (self.srcpad)
def chainfunc(self, pad, buffer):
gst.log ("Passing buffer with ts %d" % (buffer.timestamp))
return self.srcpad.push (buffer)
def eventfunc(self, pad, event):
return self.srcpad.push_event (event)
def srcqueryfunc (self, pad, query):
return self.sinkpad.query (query)
def srceventfunc (self, pad, event):
return self.sinkpad.push_event (event)
gobject.type_register(PyIdentity)
pipe = gst.Pipeline()
vt = gst.element_factory_make ("videotestsrc")
i1 = PyIdentity()
color = gst.element_factory_make ("ffmpegcolorspace")
scale = gst.element_factory_make ("videoscale")
q1 = gst.element_factory_make ("queue")
i2 = PyIdentity()
sink = gst.element_factory_make ("autovideosink")
pipe.add (vt, i1, q1, i2, color, scale, sink)
gst.element_link_many (vt, i1, q1, i2, color, scale, sink)
pipe.set_state (gst.STATE_PLAYING)
gobject.MainLoop().run()