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+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 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
+----------------------------------------------------------------------------- */
+
+/******************* Library for basic calculation routines ********************
+
+   Author(s):   M. Lohwasser
+
+   Description: auto-correlation functions
+
+*******************************************************************************/
+
+#include "autocorr2nd.h"
+
+/*  If the accumulator does not provide enough overflow bits,
+    products have to be shifted down in the autocorrelation below. */
+#define SHIFT_FACTOR (5)
+#define SHIFT >> (SHIFT_FACTOR)
+
+/*!
+ *
+ * \brief Calculate second order autocorrelation using 2 accumulators
+ *
+ */
+#if !defined(FUNCTION_autoCorr2nd_real)
+INT autoCorr2nd_real(
+    ACORR_COEFS *ac,          /*!< Pointer to autocorrelation coeffs */
+    const FIXP_DBL *reBuffer, /*!< Pointer to to real part of input samples */
+    const int len             /*!< Number input samples */
+) {
+  int j, autoCorrScaling, mScale;
+
+  FIXP_DBL accu1, accu2, accu3, accu4, accu5;
+
+  const FIXP_DBL *pReBuf;
+
+  const FIXP_DBL *realBuf = reBuffer;
+
+  /*
+    r11r,r22r
+    r01r,r12r
+    r02r
+  */
+  pReBuf = realBuf - 2;
+  accu5 = ((fMultDiv2(pReBuf[0], pReBuf[2]) + fMultDiv2(pReBuf[1], pReBuf[3]))
+               SHIFT);
+  pReBuf++;
+
+  /* len must be even */
+  accu1 = fPow2Div2(pReBuf[0]) SHIFT;
+  accu3 = fMultDiv2(pReBuf[0], pReBuf[1]) SHIFT;
+  pReBuf++;
+
+  for (j = (len - 2) >> 1; j != 0; j--, pReBuf += 2) {
+    accu1 += ((fPow2Div2(pReBuf[0]) + fPow2Div2(pReBuf[1])) SHIFT);
+
+    accu3 += ((fMultDiv2(pReBuf[0], pReBuf[1]) +
+               fMultDiv2(pReBuf[1], pReBuf[2])) SHIFT);
+
+    accu5 += ((fMultDiv2(pReBuf[0], pReBuf[2]) +
+               fMultDiv2(pReBuf[1], pReBuf[3])) SHIFT);
+  }
+
+  accu2 = (fPow2Div2(realBuf[-2]) SHIFT);
+  accu2 += accu1;
+
+  accu1 += (fPow2Div2(realBuf[len - 2]) SHIFT);
+
+  accu4 = (fMultDiv2(realBuf[-1], realBuf[-2]) SHIFT);
+  accu4 += accu3;
+
+  accu3 += (fMultDiv2(realBuf[len - 1], realBuf[len - 2]) SHIFT);
+
+  mScale = CntLeadingZeros(
+               (accu1 | accu2 | fAbs(accu3) | fAbs(accu4) | fAbs(accu5))) -
+           1;
+  autoCorrScaling = mScale - 1 - SHIFT_FACTOR; /* -1 because of fMultDiv2*/
+
+  /* Scale to common scale factor */
+  ac->r11r = accu1 << mScale;
+  ac->r22r = accu2 << mScale;
+  ac->r01r = accu3 << mScale;
+  ac->r12r = accu4 << mScale;
+  ac->r02r = accu5 << mScale;
+
+  ac->det = (fMultDiv2(ac->r11r, ac->r22r) - fMultDiv2(ac->r12r, ac->r12r));
+  mScale = CountLeadingBits(fAbs(ac->det));
+
+  ac->det <<= mScale;
+  ac->det_scale = mScale - 1;
+
+  return autoCorrScaling;
+}
+#endif
+
+#if !defined(FUNCTION_autoCorr2nd_cplx)
+INT autoCorr2nd_cplx(
+    ACORR_COEFS *ac,          /*!< Pointer to autocorrelation coeffs */
+    const FIXP_DBL *reBuffer, /*!< Pointer to real part of input samples */
+    const FIXP_DBL *imBuffer, /*!< Pointer to imag part of input samples */
+    const int len /*!< Number of input samples (should be smaller than 128) */
+) {
+  int j, autoCorrScaling, mScale, len_scale;
+
+  FIXP_DBL accu0, accu1, accu2, accu3, accu4, accu5, accu6, accu7, accu8;
+
+  const FIXP_DBL *pReBuf, *pImBuf;
+
+  const FIXP_DBL *realBuf = reBuffer;
+  const FIXP_DBL *imagBuf = imBuffer;
+
+  (len > 64) ? (len_scale = 6) : (len_scale = 5);
+  /*
+    r00r,
+    r11r,r22r
+    r01r,r12r
+    r01i,r12i
+    r02r,r02i
+  */
+  accu1 = accu3 = accu5 = accu7 = accu8 = FL2FXCONST_DBL(0.0f);
+
+  pReBuf = realBuf - 2, pImBuf = imagBuf - 2;
+  accu7 +=
+      ((fMultDiv2(pReBuf[2], pReBuf[0]) + fMultDiv2(pImBuf[2], pImBuf[0])) >>
+       len_scale);
+  accu8 +=
+      ((fMultDiv2(pImBuf[2], pReBuf[0]) - fMultDiv2(pReBuf[2], pImBuf[0])) >>
+       len_scale);
+
+  pReBuf = realBuf - 1, pImBuf = imagBuf - 1;
+  for (j = (len - 1); j != 0; j--, pReBuf++, pImBuf++) {
+    accu1 += ((fPow2Div2(pReBuf[0]) + fPow2Div2(pImBuf[0])) >> len_scale);
+    accu3 +=
+        ((fMultDiv2(pReBuf[0], pReBuf[1]) + fMultDiv2(pImBuf[0], pImBuf[1])) >>
+         len_scale);
+    accu5 +=
+        ((fMultDiv2(pImBuf[1], pReBuf[0]) - fMultDiv2(pReBuf[1], pImBuf[0])) >>
+         len_scale);
+    accu7 +=
+        ((fMultDiv2(pReBuf[2], pReBuf[0]) + fMultDiv2(pImBuf[2], pImBuf[0])) >>
+         len_scale);
+    accu8 +=
+        ((fMultDiv2(pImBuf[2], pReBuf[0]) - fMultDiv2(pReBuf[2], pImBuf[0])) >>
+         len_scale);
+  }
+
+  accu2 = ((fPow2Div2(realBuf[-2]) + fPow2Div2(imagBuf[-2])) >> len_scale);
+  accu2 += accu1;
+
+  accu1 += ((fPow2Div2(realBuf[len - 2]) + fPow2Div2(imagBuf[len - 2])) >>
+            len_scale);
+  accu0 = ((fPow2Div2(realBuf[len - 1]) + fPow2Div2(imagBuf[len - 1])) >>
+           len_scale) -
+          ((fPow2Div2(realBuf[-1]) + fPow2Div2(imagBuf[-1])) >> len_scale);
+  accu0 += accu1;
+
+  accu4 = ((fMultDiv2(realBuf[-1], realBuf[-2]) +
+            fMultDiv2(imagBuf[-1], imagBuf[-2])) >>
+           len_scale);
+  accu4 += accu3;
+
+  accu3 += ((fMultDiv2(realBuf[len - 1], realBuf[len - 2]) +
+             fMultDiv2(imagBuf[len - 1], imagBuf[len - 2])) >>
+            len_scale);
+
+  accu6 = ((fMultDiv2(imagBuf[-1], realBuf[-2]) -
+            fMultDiv2(realBuf[-1], imagBuf[-2])) >>
+           len_scale);
+  accu6 += accu5;
+
+  accu5 += ((fMultDiv2(imagBuf[len - 1], realBuf[len - 2]) -
+             fMultDiv2(realBuf[len - 1], imagBuf[len - 2])) >>
+            len_scale);
+
+  mScale =
+      CntLeadingZeros((accu0 | accu1 | accu2 | fAbs(accu3) | fAbs(accu4) |
+                       fAbs(accu5) | fAbs(accu6) | fAbs(accu7) | fAbs(accu8))) -
+      1;
+  autoCorrScaling = mScale - 1 - len_scale; /* -1 because of fMultDiv2*/
+
+  /* Scale to common scale factor */
+  ac->r00r = (FIXP_DBL)accu0 << mScale;
+  ac->r11r = (FIXP_DBL)accu1 << mScale;
+  ac->r22r = (FIXP_DBL)accu2 << mScale;
+  ac->r01r = (FIXP_DBL)accu3 << mScale;
+  ac->r12r = (FIXP_DBL)accu4 << mScale;
+  ac->r01i = (FIXP_DBL)accu5 << mScale;
+  ac->r12i = (FIXP_DBL)accu6 << mScale;
+  ac->r02r = (FIXP_DBL)accu7 << mScale;
+  ac->r02i = (FIXP_DBL)accu8 << mScale;
+
+  ac->det =
+      (fMultDiv2(ac->r11r, ac->r22r) >> 1) -
+      ((fMultDiv2(ac->r12r, ac->r12r) + fMultDiv2(ac->r12i, ac->r12i)) >> 1);
+  mScale = CntLeadingZeros(fAbs(ac->det)) - 1;
+
+  ac->det <<= mScale;
+  ac->det_scale = mScale - 2;
+
+  return autoCorrScaling;
+}
+
+#endif /* FUNCTION_autoCorr2nd_cplx */