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
---
 libAACenc/src/spreading.cpp | 52 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 libAACenc/src/spreading.cpp

(limited to 'libAACenc/src/spreading.cpp')

diff --git a/libAACenc/src/spreading.cpp b/libAACenc/src/spreading.cpp
new file mode 100644
index 0000000..fc2f2f6
--- /dev/null
+++ b/libAACenc/src/spreading.cpp
@@ -0,0 +1,52 @@
+/******************************** MPEG Audio Encoder **************************
+
+                     (C) Copyright Fraunhofer IIS (1999)
+                               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.
+
+
+   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.
+
+   $Id$
+   Initial author:       M.Werner
+   contents/description: Spreading of energy
+
+******************************************************************************/
+
+#include "spreading.h"
+
+void FDKaacEnc_SpreadingMax(const INT       pbCnt,
+                            const FIXP_DBL  *RESTRICT maskLowFactor,
+                            const FIXP_DBL  *RESTRICT maskHighFactor,
+                            FIXP_DBL        *RESTRICT pbSpreadEnergy)
+{
+   int i;
+   FIXP_DBL delay;
+
+   /* slope to higher frequencies */
+   delay = pbSpreadEnergy[0];
+   for (i=1; i<pbCnt; i++) {
+      delay = fixMax(pbSpreadEnergy[i], fMult(maskHighFactor[i], delay));
+      pbSpreadEnergy[i] = delay;
+   }
+
+   /* slope to lower frequencies */
+   delay = pbSpreadEnergy[pbCnt-1];
+   for (i=pbCnt-2; i>=0; i--) {
+      delay = fixMax(pbSpreadEnergy[i], fMult(maskLowFactor[i],delay));
+      pbSpreadEnergy[i] = delay;
+   }
+}
-- 
cgit v1.2.3