gstbasetransform is a module that aims to provide a patched
GstBase.BaseTransform class usable from python.
- Source code repository and issue tracker:
- https://github.com/Muges/gstbasetransform/
- Python Package Index:
- https://pypi.python.org/pypi/gstbasetransform/
- License:
- LGPL 2.1 -- see the file
LICENSEfor details.
gstbasetransform should work with python 2.7 and python 3.4+.
You will first need to install PyGObject and python-gst, as they are not
available on pip. You can then install the latest version of
gstbasetransform with pip:
pip install gstbasetransform
gstbasetransform provides a subclass of GstBase.BaseTransform, also called
BaseTransform, whose do_transform_size virtual method has been patched
to be usable in python.
In the original do_transform_size virtual method, the othersize parameter
that represents the size of the output buffer is an int, and is passed by
copy, preventing it from being changed. In gstbasetransform.BaseTransform,
it has been removed, and the size of the output buffer can be set with a return
value of the method.
The signature of the method is:
do_transform_size(direction, caps, size, othercaps)
and it should return a tuple (bool, int), where the int is the size of
the output buffer.
See the test_gstbasetransform.py file for a basic example.
Thanks to Dustin Spicuzza for writing pygi-treeview-dnd, which served as a
base for writing gstbasetransform.