subprojects/gst-python/examples/plugins/python/identity.py

   1 #!/usr/bin/env python
   2 # -*- Mode: Python -*-
   3 # vi:si:et:sw=4:sts=4:ts=4
   4
   5 # identity.py
   6 # 2016 Marianna S. Buschle <msb@qtec.com>
   7 #
   8 # Simple identity element in python
   9 #
  10 # You can run the example from the source doing from gst-python/:
  11 #
  12 #  $ export GST_PLUGIN_PATH=$GST_PLUGIN_PATH:$PWD/plugin:$PWD/examples/plugins
  13 #  $ GST_DEBUG=python:4 gst-launch-1.0 fakesrc num-buffers=10 ! identity_py ! fakesink
  14
  15 import gi
  16 gi.require_version('GstBase', '1.0')
  17
  18 from gi.repository import Gst, GObject, GstBase
  19 Gst.init_python()
  20
  21 #
  22 # Simple Identity element created entirely in python
  23 #
  24 class Identity(GstBase.BaseTransform):
  25     __gstmetadata__ = ('Identity Python','Transform', \
  26                       'Simple identity element written in python', 'Marianna S. Buschle')
  27
  28     __gsttemplates__ = (Gst.PadTemplate.new("src",
  29                                            Gst.PadDirection.SRC,
  30                                            Gst.PadPresence.ALWAYS,
  31                                            Gst.Caps.new_any()),
  32                        Gst.PadTemplate.new("sink",
  33                                            Gst.PadDirection.SINK,
  34                                            Gst.PadPresence.ALWAYS,
  35                                            Gst.Caps.new_any()))
  36
  37     def do_transform_ip(self, buffer):
  38         Gst.info("timestamp(buffer):%s" % (Gst.TIME_ARGS(buffer.pts)))
  39         return Gst.FlowReturn.OK
  40
  41 GObject.type_register(Identity)
  42 __gstelementfactory__ = ("identity_py", Gst.Rank.NONE, Identity)