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- # -*- Mode: Python; py-indent-offset: 4 -*-
- # pygst - Python bindings for the GStreamer multimedia framework.
- # Copyright (C) 1998-2002 James Henstridge
- # (C) 2005 Edward Hervey
- #
- # pygst.py: pygst version selection code.
- #
- #
- # This library is free software; you can redistribute it and/or
- # modify it under the terms of the GNU Library General Public
- # License as published by the Free Software Foundation; either
- # version 2 of the License, or (at your option) any later version.
- #
- # This library is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- # Library General Public License for more details.
- #
- # You should have received a copy of the GNU Library General Public
- # License along with this library; if not, write to the
- # Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- # Boston, MA 02111-1307, USA.
- #
- # This allows parallel installation of gst-python
- #
- # In order to have backward compatibility
-
- import sys
- import os.path
-
- __all__ = ['require']
-
- _pygst_dir = os.path.dirname(__file__) + '/gst-0.10'
-
- _pygst_version = '0.10'
-
- _pygst_required_version = None
-
- class RequiredVersionError(ValueError, AssertionError):
- # AssertionError is subclassed for compatibility reasons.
- pass
-
-
- def require(version):
- global _pygst_required_version
-
- if _pygst_required_version != None:
- if _pygst_required_version != version:
- raise RequiredVersionError, "a different version of gst was already required"
- else:
- return
-
- if sys.modules.has_key('gst'):
- raise RequiredVersionError, "pygst.require() must be called before importing gst"
-
- if version != _pygst_version:
- raise RequiredVersionError, "Only version '%s' is available" % _pygst_version
-
- # move the pygst path to the front
- while _pygst_dir in sys.path:
- sys.path.remove(_pygst_dir)
- sys.path.insert(0, _pygst_dir)
-
- _pygst_required_version = version
-