diff --git a/vp4dc.h b/vp4dc.h
index 9c81cb9..b9a7e53 100644
--- a/vp4dc.h
+++ b/vp4dc.h
@@ -1,7 +1,7 @@
 /**
-    Copyright (C) powturbo 2013-2014
+    Copyright (C) powturbo 2013-2015
     GPL v2 License
-
+  
     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
@@ -16,20 +16,37 @@
     with this program; if not, write to the Free Software Foundation, Inc.,
     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-    - email    : powturbo [AT] gmail.com
-    - github   : https://github.com/powturbo
     - homepage : https://sites.google.com/site/powturbo/
+    - github   : https://github.com/powturbo
     - twitter  : https://twitter.com/powturbo
-
-    vp4dc.h - "Integer Compression" TurboPfor  (see vp4dd.h for decompression) 
+    - email    : powturbo [_AT_] gmail [_DOT_] com
 **/
+//     vp4dc.h - "Integer Compression" TurboPfor  (see vp4dd.h for decompression) 
+
+#define P4DEB(__b) (__b << 1)
+#define P4DEBX(__b, __bx) (__bx << 8 | __b << 1 | 1) 
+#define P4DSAVE(__out, __b, __bx) do { if(!__bx) *__out++ = P4DEB(__b);else *(unsigned short *)__out = P4DEBX(__b, __bx), __out += 2; } while(0)
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 // compress integer array with n values to the buffer out. Return value = end of compressed buffer out
-unsigned char *p4denc32(unsigned       *__restrict in, int n, unsigned char *__restrict out);
-unsigned char *p4denc16(unsigned short *__restrict in, int n, unsigned char *__restrict out);
+unsigned char *p4denc32(unsigned       *__restrict in, unsigned n, unsigned char *__restrict out);
+unsigned char *p4denc16(unsigned short *__restrict in, unsigned n, unsigned char *__restrict out);
+
+// SIMD compress integer array with n values to the buffer out. Return value = end of compressed buffer out
+unsigned char *p4dencv32(unsigned        *__restrict in, unsigned n, unsigned char *__restrict out);
+//unsigned char *p4denc16(unsigned short *__restrict in, unsigned n, unsigned char *__restrict out);
+
+// calculate the best bit size b and bx. 
+unsigned p4d32(unsigned       *__restrict in, unsigned n, unsigned *pbx);
+unsigned p4d16(unsigned short *__restrict in, unsigned n, unsigned *pbx);
+
+// same as p4denc, but with b and bx as parameters. Call after p4d32/p4d16
+unsigned char *p4de32(unsigned       *__restrict in, unsigned n, unsigned char *__restrict out, unsigned b, unsigned bx);
+unsigned char *p4de16(unsigned short *__restrict in, unsigned n, unsigned char *__restrict out, unsigned b, unsigned bx);
+unsigned char *p4dev32(unsigned      *__restrict in, unsigned n, unsigned char *__restrict out, unsigned b, unsigned bx);
 
 #ifdef __cplusplus
 }