vlc.MediaOpenCb
===============

.. py:class:: vlc.MediaOpenCb

   Bases: :py:obj:`ctypes.c_void_p`


   Callback prototype to open a custom bitstream input media.

   The same media item can be opened multiple times. Each time, this callback
   is invoked. It should allocate and initialize any instance-specific
   resources, then store them in **datap*. The instance resources can be freed
   in the :class:`MediaCloseCb` callback.

   .. note:: For convenience, **datap* is initially None and **sizep* is initially 0.

   :param opaque: private pointer as passed to :func:`libvlc_media_new_callbacks`.
   :param datap: storage space for a private data pointer [OUT].
   :param sizep: byte length of the bitstream or UINT64_MAX if unknown [OUT].

   :return: 0 on success, non-zero on error. In case of failure, the other.
       callbacks will not be invoked and any value stored in **datap* and **sizep* is.
       discarded.

   Initialize self.  See help(type(self)) for accurate signature.