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
---
 libSBRdec/src/arm/lpp_tran_arm.cpp | 89 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 libSBRdec/src/arm/lpp_tran_arm.cpp

(limited to 'libSBRdec/src/arm/lpp_tran_arm.cpp')

diff --git a/libSBRdec/src/arm/lpp_tran_arm.cpp b/libSBRdec/src/arm/lpp_tran_arm.cpp
new file mode 100644
index 0000000..789f4db
--- /dev/null
+++ b/libSBRdec/src/arm/lpp_tran_arm.cpp
@@ -0,0 +1,89 @@
+/********************************  Fraunhofer IIS  ***************************
+
+                        (C) Copyright Fraunhofer IIS (2011)
+                               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):   Arthur Tritthart
+   Description: (ARM optimised) LPP transposer subroutines
+
+   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(__arm__)
+
+
+#define FUNCTION_LPPTRANSPOSER_func1
+
+#ifdef FUNCTION_LPPTRANSPOSER_func1
+
+/* Note: This code requires only 43 cycles per iteration instead of 61 on ARM926EJ-S */
+__attribute__ ((noinline)) static void lppTransposer_func1(
+  FIXP_DBL *lowBandReal,
+  FIXP_DBL *lowBandImag,
+  FIXP_DBL **qmfBufferReal,
+  FIXP_DBL **qmfBufferImag,
+  int loops,
+  int hiBand,
+  int dynamicScale,
+  int descale,
+  FIXP_SGL a0r,
+  FIXP_SGL a0i,
+  FIXP_SGL a1r,
+  FIXP_SGL a1i)
+{
+
+  FIXP_DBL real1, real2, imag1, imag2, accu1, accu2;
+
+  real2 = lowBandReal[-2];
+  real1 = lowBandReal[-1];
+  imag2 = lowBandImag[-2];
+  imag1 = lowBandImag[-1];
+  for(int i=0; i < loops; i++)
+  {
+    accu1 = fMultDiv2(         a0r,real1);
+    accu2 = fMultDiv2(         a0i,imag1);
+    accu1 = fMultAddDiv2(accu1,a1r,real2);
+    accu2 = fMultAddDiv2(accu2,a1i,imag2);
+    real2 = fMultDiv2(         a1i,real2);
+    accu1 = accu1 - accu2;
+    accu1 = accu1 >> dynamicScale;
+
+    accu2 = fMultAddDiv2(real2,a1r,imag2);
+    real2 = real1;
+    imag2 = imag1;
+    accu2 = fMultAddDiv2(accu2,a0i,real1);
+    real1 = lowBandReal[i];
+    accu2 = fMultAddDiv2(accu2,a0r,imag1);
+    imag1 = lowBandImag[i];
+    accu2 = accu2 >> dynamicScale;
+
+    accu1 <<= 1;
+    accu2 <<= 1;
+
+    qmfBufferReal[i][hiBand] = accu1 + (real1>>descale);
+    qmfBufferImag[i][hiBand] = accu2 + (imag1>>descale);
+  }
+}
+#endif  /* #ifdef FUNCTION_LPPTRANSPOSER_func1 */
+#endif  /* __arm__ */
+
+
+
-- 
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