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/src/mips/scale.cpp | 57 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 libFDK/src/mips/scale.cpp

(limited to 'libFDK/src/mips/scale.cpp')

diff --git a/libFDK/src/mips/scale.cpp b/libFDK/src/mips/scale.cpp
new file mode 100644
index 0000000..31d1f7e
--- /dev/null
+++ b/libFDK/src/mips/scale.cpp
@@ -0,0 +1,57 @@
+/***************************  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.
+
+******************************************************************************/
+
+#if defined(__mips_dsp)
+
+#ifndef FUNCTION_getScalefactor_DBL
+#define FUNCTION_getScalefactor_DBL
+/*!
+ *
+ *  \brief Calculate max possible scale factor for input vector
+ *
+ *  \return Maximum scale factor
+ *
+ *  This function can constitute a significant amount of computational complexity - very much depending on the
+ *  bitrate. Since it is a rather small function, effective assembler optimization might be possible.
+ *
+ */
+inline INT getScalefactor(const FIXP_DBL *vector, /*!< Pointer to input vector */
+                          INT len)                /*!< Length of input vector */
+{
+  INT i;
+  FIXP_DBL maxVal = FL2FX_DBL(0.0f);
+
+  for(i=len;i!=0;i--){
+    maxVal |= __builtin_mips_absq_s_w(*vector++);
+  }
+
+  return fixMax((INT)0,(CntLeadingZeros(maxVal) - 1));
+}
+#endif
+
+#endif /*__mips_dsp */
-- 
cgit v1.2.3