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/env_calc_arm.cpp | 86 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 libSBRdec/src/arm/env_calc_arm.cpp

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

diff --git a/libSBRdec/src/arm/env_calc_arm.cpp b/libSBRdec/src/arm/env_calc_arm.cpp
new file mode 100644
index 0000000..8fa3718
--- /dev/null
+++ b/libSBRdec/src/arm/env_calc_arm.cpp
@@ -0,0 +1,86 @@
+/********************************  Fraunhofer IIS  ***************************
+
+                        (C) Copyright Fraunhofer IIS (2010)
+                               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) SBR domain coding
+
+   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 INCLUSION_GUARD_CALC_ENV_ARM
+#define INCLUSION_GUARD_CALC_ENV_ARM
+
+
+/*!
+  \brief   Compute maximal value of a complex array (re/im) of a given width
+           Negative values are temporarily logically or'ed with 0xFFFFFFFF
+           instead of negating the value, if the sign bit is set.
+  \param   maxVal  Preset maximal value
+  \param   reTmp   real input signal
+  \param   imTmp   imaginary input signal
+  \return  new maximal value
+*/
+
+#ifdef FUNCTION_FDK_get_maxval
+__asm FIXP_DBL FDK_get_maxval (FIXP_DBL maxVal, FIXP_DBL *reTmp, FIXP_DBL *imTmp, int width )
+{
+
+  /* Register map:
+     r0    maxVal
+     r1    reTmp
+     r2    imTmp
+     r3    width
+     r4    real
+     r5    imag
+  */
+    PUSH    {r4-r5}
+
+    MOVS    r3, r3, ASR #1
+    ADC     r3, r3, #0
+    BCS     FDK_get_maxval_loop_2nd_part
+    BEQ     FDK_get_maxval_loop_end
+
+FDK_get_maxval_loop
+    LDR     r4, [r1], #4
+    LDR     r5, [r2], #4
+    EOR     r4, r4, r4, ASR #31
+    EOR     r5, r5, r5, ASR #31
+    ORR     r0, r0, r4
+    ORR     r0, r0, r5
+
+FDK_get_maxval_loop_2nd_part
+    LDR     r4, [r1], #4
+    LDR     r5, [r2], #4
+    EOR     r4, r4, r4, ASR #31
+    EOR     r5, r5, r5, ASR #31
+    ORR     r0, r0, r4
+    ORR     r0, r0, r5
+
+    SUBS    r3, r3, #1
+    BNE     FDK_get_maxval_loop
+
+FDK_get_maxval_loop_end
+    POP     {r4-r5}
+    BX      lr
+}
+#endif /* FUNCTION_FDK_get_maxval */
+
+#endif /* INCLUSION_GUARD_CALC_ENV_ARM */
-- 
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