* morituri/test/test_common_gstreamer.py (added):

* morituri/common/gstreamer.py:
	* morituri/test/Makefile.am:
	  add functions to get versions of gstreamer, gst-python,
	  and element factory plugins.

morituri/common/gstreamer.py

@@ -20,6 +20,9 @@
 # You should have received a copy of the GNU General Public License
 # along with morituri.  If not, see <http://www.gnu.org/licenses/>.
 
+import re
+import commands
+
 from morituri.common import log
 
 # workaround for issue #64
@@ -48,3 +51,34 @@ def removeAudioParsers():
             return
 
         registry.remove_plugin(plugin)
+
+def gstreamerVersion():
+    import gst
+    return _versionify(gst.version())
+
+def gstPythonVersion():
+    import gst
+    return _versionify(gst.pygst_version)
+
+_VERSION_RE = re.compile(
+    "Version:\s*(?P<version>[\d.]+)")
+
+def elementFactoryVersion(name):
+    # surprisingly, there is no python way to get from an element factory
+    # to its plugin and its version directly; you can only compare
+    # with required versions
+    # Let's use gst-inspect-0.10 and wave hands and assume it points to the
+    # same version that python uses
+    output = commands.getoutput('gst-inspect-0.10 %s | grep Version' % name)
+    m = _VERSION_RE.search(output)
+    if not m:
+        return None
+    return m.group('version')
+
+
+def _versionify(tup):
+    l = list(tup)
+    if len(l) == 4 and l[3] == 0:
+        l = l[:3]
+    v = [str(n) for n in l]
+    return ".".join(v)