From 9bf37cc9712506b2483650c82d3c41152337ef7e Mon Sep 17 00:00:00 2001
From: Dave Burke <daveburke@google.com>
Date: Tue, 17 Apr 2012 09:51:45 -0700
Subject: Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
---
 libFDK/include/mips/scramble.h | 59 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 libFDK/include/mips/scramble.h

(limited to 'libFDK/include/mips/scramble.h')

diff --git a/libFDK/include/mips/scramble.h b/libFDK/include/mips/scramble.h
new file mode 100644
index 0000000..b93031a
--- /dev/null
+++ b/libFDK/include/mips/scramble.h
@@ -0,0 +1,59 @@
+/***************************  Fraunhofer IIS FDK Tools  **********************
+
+                        (C) Copyright Fraunhofer IIS (2007)
+                               All Rights Reserved
+
+    Please be advised that this software and/or program delivery is
+    Confidential Information of Fraunhofer and subject to and covered by the
+
+    Fraunhofer IIS Software Evaluation Agreement
+    between Google Inc. and  Fraunhofer
+    effective and in full force since March 1, 2012.
+
+    You may use this software and/or program only under the terms and
+    conditions described in the above mentioned Fraunhofer IIS Software
+    Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+   $Id$
+   Author(s):
+   Description:
+
+   This software and/or program is protected by copyright law and international
+   treaties. Any reproduction or distribution of this software and/or program,
+   or any portion of it, may result in severe civil and criminal penalties, and
+   will be prosecuted to the maximum extent possible under law.
+
+******************************************************************************/
+
+#ifndef MIPS_SCRAMBLE_H
+#define MIPS_SCRAMBLE_H
+
+#define FUNCTION_scramble
+
+#if defined(FUNCTION_scramble)
+inline void scramble(FIXP_DBL *x, INT n) {
+  INT m,j;
+  int ldn=1;
+  do {ldn++;} while((1<<ldn)<n);
+
+  for (m=1,j=0; m<n-1; m++)
+  {
+    j = __builtin_mips_bitrev(m) >> (16-ldn);
+
+    if (j>m)
+    {
+      FIXP_DBL tmp;
+      tmp=x[2*m];
+      x[2*m]=x[2*j];
+      x[2*j]=tmp;
+
+      tmp=x[2*m+1];
+      x[2*m+1]=x[2*j+1];
+      x[2*j+1]=tmp;
+    }
+  }
+}
+#endif
+
+#endif /* MIPS_SCRAMBLE_H */
-- 
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