Fixed wxMemoryOutputStream (it wasn't working at all)

Fixed wxStreamBuffer to support features of wxMemoryOutputStream
wxMMedia2 updates (various fixes)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4406 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

utils/wxMMedia2/lib/sndaiff.h

@@ -27,6 +27,8 @@ class wxSoundAiff: public wxSoundFileStream {
   wxSoundAiff(wxOutputStream& stream, wxSoundStream& io_sound);
   ~wxSoundAiff();
 
+  bool CanRead();
+
  protected:
   bool PrepareToPlay(); 
   bool PrepareToRecord(unsigned long time);