--- emms.c	2002/03/08 02:44:58	1.1
+++ emms.c	2002/09/05 21:15:18	1.4
@@ -1,6 +1,62 @@
+/*****************************************************************************
+ *
+ *  XVID MPEG-4 VIDEO CODEC
+ *  - emms C wrapper -
+ *
+ *  This program is an implementation of a part of one or more MPEG-4
+ *  Video tools as specified in ISO/IEC 14496-2 standard.  Those intending
+ *  to use this software module in hardware or software products are
+ *  advised that its use may infringe existing patents or copyrights, and
+ *  any such use would be at such party's own risk.  The original
+ *  developer of this software module and his/her company, and subsequent
+ *  editors and their companies, will have no liability for use of this
+ *  software or modifications or derivatives thereof.
+ *
+ *  This program is free software ; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation ; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program ; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ ****************************************************************************/
+
 #include "emms.h"
 #include "../portab.h"
 
+/*****************************************************************************
+ * Library data, declared here
+ ****************************************************************************/
+
 emmsFuncPtr emms;
-void emms_c() {}
-void emms_mmx() { EMMS(); }
+
+
+/*****************************************************************************
+ * emms functions
+ *
+ * emms functions are used to restored the fpu context after mmx operations
+ * because mmx and fpu share their registers/context (??? need to be confirmed)
+ *
+ ****************************************************************************/
+
+/* The no op wrapper for non MMX platforms */
+void
+emms_c()
+{
+}
+
+/* The real mmx emms wrapper */
+void
+emms_mmx()
+{
+	/* the EMMS macro is defined according to the compiler in portab.h */
+	EMMS();
+
+}