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+
+/* -----------------------------------------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+  All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
+the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
+This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
+audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
+independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
+of the MPEG specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
+may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
+individually for the purpose of encoding or decoding bit streams in products that are compliant with
+the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
+these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
+software may already be covered under those patent licenses when it is used for those licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
+are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
+applications information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification, are permitted without
+payment of copyright license fees provided that you satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
+your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation and/or other materials
+provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
+You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived from this library without
+prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
+software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
+and the date of any change. For modified versions of the FDK AAC Codec, the term
+"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
+"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
+ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
+respect to this software.
+
+You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
+by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
+"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
+of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
+including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
+or business interruption, however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of this software, even if
+advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------------------------------------- */
+
+/***************************  Fraunhofer IIS FDK Tools  **********************
+
+   Author(s):   Haricharan Lakshman, Manuel Jander
+   Description: Trigonometric functions fixed point fractional implementation.
+
+******************************************************************************/
+
+
+
+#include "common_fix.h"
+
+#include "FDK_tools_rom.h"
+
+/* Fixed point precision definitions */
+#define Q(format)        ((FIXP_DBL)(((LONG)1) << (format)))
+
+#ifndef M_PI
+#define M_PI      (3.14159265358979323846f)
+#endif
+
+/*!
+ * Inverse tangent function.
+ */
+
+// --- fixp_atan() ----
+#define Q_ATANINP   (25)    // Input in q25, Output in q30
+#define Q_ATANOUT   (30)
+#define ATI_SF              ((DFRACT_BITS-1)-Q_ATANINP)  // 6
+#define ATI_SCALE           ((float)(1<<ATI_SF))         //
+#define ATO_SF              ((DFRACT_BITS-1)-Q_ATANOUT)  // 1   ] -pi/2 .. pi/2 [
+#define ATO_SCALE           ((float)(1<<ATO_SF))         //
+// --- fixp_atan2() ---
+#define Q_ATAN2OUT  (29)
+#define AT2O_SF             ((DFRACT_BITS-1)-Q_ATAN2OUT) // 2   ] -pi   .. pi   ]
+#define AT2O_SCALE          ((float)(1<<AT2O_SF))        //
+// --------------------
+
+FIXP_DBL fixp_atan(FIXP_DBL x);
+FIXP_DBL fixp_atan2(FIXP_DBL y, FIXP_DBL x);
+
+FIXP_DBL fixp_cos(FIXP_DBL x, int scale);
+FIXP_DBL fixp_sin(FIXP_DBL x, int scale);
+
+#define FIXP_COS_SIN
+
+
+#include "FDK_tools_rom.h"
+
+#define SINETAB SineTable512
+#define LD 9
+
+
+#ifndef FUNCTION_inline_fixp_cos_sin
+
+#define FUNCTION_inline_fixp_cos_sin
+
+/*
+ * Calculates coarse lookup index and sign for sine.
+ * Returns delta x residual.
+ */
+static inline FIXP_DBL fixp_sin_cos_residual_inline(FIXP_DBL x, int scale, FIXP_DBL *sine, FIXP_DBL *cosine)
+{
+    FIXP_DBL residual;
+    int s;
+    int shift = (31-scale-LD-1);
+    int ssign = 1;
+    int csign = 1;
+
+    residual = fMult(x, FL2FXCONST_DBL(1.0/M_PI));
+    s = ((LONG)residual) >> shift;
+
+    residual &= ( (1<<shift) - 1 );
+    residual = fMult(residual, FL2FXCONST_DBL(M_PI/4.0)) << 2;
+    residual <<= scale;
+
+    /* Sine sign symmetry */
+    if (s & ((1<<LD)<<1) ) {
+      ssign = -ssign;
+    }
+    /* Cosine sign symmetry */
+    if ( (s + (1<<LD)) & ((1<<LD)<<1) ) {
+      csign = -csign;
+    }
+
+    s = fAbs(s);
+
+    s &= (((1<<LD)<<1)-1); /* Modulo PI */
+
+    if (s > (1<<LD)) {
+      s = ((1<<LD)<<1) - s;
+    }
+
+    {
+      LONG sl, cl;
+      /* Because of packed table */
+      if (s > (1<<(LD-1))) {
+        FIXP_STP tmp;
+        /* Cosine/Sine simetry for angles greater than PI/4 */
+        s = (1<<LD)-s;
+        tmp = SINETAB[s];
+        sl = (LONG)tmp.v.re;
+        cl = (LONG)tmp.v.im;
+      } else {
+        FIXP_STP tmp;
+        tmp = SINETAB[s];
+        sl = (LONG)tmp.v.im;
+        cl = (LONG)tmp.v.re;
+      }
+
+#ifdef SINETABLE_16BIT
+      *sine   = (FIXP_DBL)((sl * ssign) << (DFRACT_BITS-FRACT_BITS));
+      *cosine = (FIXP_DBL)((cl * csign) << (DFRACT_BITS-FRACT_BITS));
+#else
+      *sine   = (FIXP_DBL)(sl * ssign);
+      *cosine = (FIXP_DBL)(cl * csign);
+#endif
+    }
+
+    return residual;
+}
+
+/**
+ * \brief Calculate cosine and sine value each of 2 angles different angle values.
+ * \param x1 first angle value
+ * \param x2 second angle value
+ * \param scale exponent of x1 and x2
+ * \param out pointer to 4 FIXP_DBL locations, were the values cos(x1), sin(x1), cos(x2), sin(x2)
+ *            will be stored into.
+ */
+static inline void inline_fixp_cos_sin (FIXP_DBL x1, FIXP_DBL x2, const int scale, FIXP_DBL *out)
+{
+    FIXP_DBL residual, error0, error1, sine, cosine;
+    residual = fixp_sin_cos_residual_inline(x1, scale, &sine, &cosine);
+    error0 = fMultDiv2(sine, residual);
+    error1 = fMultDiv2(cosine, residual);
+    *out++  = cosine - (error0<<1);
+    *out++  = sine   + (error1<<1);
+
+    residual = fixp_sin_cos_residual_inline(x2, scale, &sine, &cosine);
+    error0 = fMultDiv2(sine, residual);
+    error1 = fMultDiv2(cosine, residual);
+    *out++  = cosine - (error0<<1);
+    *out++  = sine   + (error1<<1);
+}
+#endif
+