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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
+----------------------------------------------------------------------------- */
+
+/**************************** AAC encoder library ******************************
+
+   Author(s):   M.Werner
+
+   Description: Quantization
+
+*******************************************************************************/
+
+#include "quantize.h"
+
+#include "aacEnc_rom.h"
+
+/*****************************************************************************
+
+    functionname: FDKaacEnc_quantizeLines
+    description: quantizes spectrum lines
+    returns:
+    input: global gain, number of lines to process, spectral data
+    output: quantized spectrum
+
+*****************************************************************************/
+static void FDKaacEnc_quantizeLines(INT gain, INT noOfLines,
+                                    const FIXP_DBL *mdctSpectrum,
+                                    SHORT *quaSpectrum, INT dZoneQuantEnable) {
+  int line;
+  FIXP_DBL k = FL2FXCONST_DBL(0.0f);
+  FIXP_QTD quantizer = FDKaacEnc_quantTableQ[(-gain) & 3];
+  INT quantizershift = ((-gain) >> 2) + 1;
+  const INT kShift = 16;
+
+  if (dZoneQuantEnable)
+    k = FL2FXCONST_DBL(0.23f) >> kShift;
+  else
+    k = FL2FXCONST_DBL(-0.0946f + 0.5f) >> kShift;
+
+  for (line = 0; line < noOfLines; line++) {
+    FIXP_DBL accu = fMultDiv2(mdctSpectrum[line], quantizer);
+
+    if (accu < FL2FXCONST_DBL(0.0f)) {
+      accu = -accu;
+      /* normalize */
+      INT accuShift = CntLeadingZeros(accu) - 1; /* CountLeadingBits() is not
+                                                    necessary here since test
+                                                    value is always > 0 */
+      accu <<= accuShift;
+      INT tabIndex =
+          (INT)(accu >> (DFRACT_BITS - 2 - MANT_DIGITS)) & (~MANT_SIZE);
+      INT totalShift = quantizershift - accuShift + 1;
+      accu = fMultDiv2(FDKaacEnc_mTab_3_4[tabIndex],
+                       FDKaacEnc_quantTableE[totalShift & 3]);
+      totalShift = (16 - 4) - (3 * (totalShift >> 2));
+      FDK_ASSERT(totalShift >= 0); /* MAX_QUANT_VIOLATION */
+      accu >>= fixMin(totalShift, DFRACT_BITS - 1);
+      quaSpectrum[line] =
+          (SHORT)(-((LONG)(k + accu) >> (DFRACT_BITS - 1 - 16)));
+    } else if (accu > FL2FXCONST_DBL(0.0f)) {
+      /* normalize */
+      INT accuShift = CntLeadingZeros(accu) - 1; /* CountLeadingBits() is not
+                                                    necessary here since test
+                                                    value is always > 0 */
+      accu <<= accuShift;
+      INT tabIndex =
+          (INT)(accu >> (DFRACT_BITS - 2 - MANT_DIGITS)) & (~MANT_SIZE);
+      INT totalShift = quantizershift - accuShift + 1;
+      accu = fMultDiv2(FDKaacEnc_mTab_3_4[tabIndex],
+                       FDKaacEnc_quantTableE[totalShift & 3]);
+      totalShift = (16 - 4) - (3 * (totalShift >> 2));
+      FDK_ASSERT(totalShift >= 0); /* MAX_QUANT_VIOLATION */
+      accu >>= fixMin(totalShift, DFRACT_BITS - 1);
+      quaSpectrum[line] = (SHORT)((LONG)(k + accu) >> (DFRACT_BITS - 1 - 16));
+    } else {
+      quaSpectrum[line] = 0;
+    }
+  }
+}
+
+/*****************************************************************************
+
+    functionname:iFDKaacEnc_quantizeLines
+    description: iquantizes spectrum lines
+                 mdctSpectrum = iquaSpectrum^4/3 *2^(0.25*gain)
+    input: global gain, number of lines to process,quantized spectrum
+    output: spectral data
+
+*****************************************************************************/
+static void FDKaacEnc_invQuantizeLines(INT gain, INT noOfLines,
+                                       SHORT *quantSpectrum,
+                                       FIXP_DBL *mdctSpectrum)
+
+{
+  INT iquantizermod;
+  INT iquantizershift;
+  INT line;
+
+  iquantizermod = gain & 3;
+  iquantizershift = gain >> 2;
+
+  for (line = 0; line < noOfLines; line++) {
+    if (quantSpectrum[line] < 0) {
+      FIXP_DBL accu;
+      INT ex, specExp, tabIndex;
+      FIXP_DBL s, t;
+
+      accu = (FIXP_DBL)-quantSpectrum[line];
+
+      ex = CountLeadingBits(accu);
+      accu <<= ex;
+      specExp = (DFRACT_BITS - 1) - ex;
+
+      FDK_ASSERT(specExp < 14); /* this fails if abs(value) > 8191 */
+
+      tabIndex = (INT)(accu >> (DFRACT_BITS - 2 - MANT_DIGITS)) & (~MANT_SIZE);
+
+      /* calculate "mantissa" ^4/3 */
+      s = FDKaacEnc_mTab_4_3Elc[tabIndex];
+
+      /* get approperiate exponent multiplier for specExp^3/4 combined with
+       * scfMod */
+      t = FDKaacEnc_specExpMantTableCombElc[iquantizermod][specExp];
+
+      /* multiply "mantissa" ^4/3 with exponent multiplier */
+      accu = fMult(s, t);
+
+      /* get approperiate exponent shifter */
+      specExp = FDKaacEnc_specExpTableComb[iquantizermod][specExp] -
+                1; /* -1 to avoid overflows in accu */
+
+      if ((-iquantizershift - specExp) < 0)
+        accu <<= -(-iquantizershift - specExp);
+      else
+        accu >>= -iquantizershift - specExp;
+
+      mdctSpectrum[line] = -accu;
+    } else if (quantSpectrum[line] > 0) {
+      FIXP_DBL accu;
+      INT ex, specExp, tabIndex;
+      FIXP_DBL s, t;
+
+      accu = (FIXP_DBL)(INT)quantSpectrum[line];
+
+      ex = CountLeadingBits(accu);
+      accu <<= ex;
+      specExp = (DFRACT_BITS - 1) - ex;
+
+      FDK_ASSERT(specExp < 14); /* this fails if abs(value) > 8191 */
+
+      tabIndex = (INT)(accu >> (DFRACT_BITS - 2 - MANT_DIGITS)) & (~MANT_SIZE);
+
+      /* calculate "mantissa" ^4/3 */
+      s = FDKaacEnc_mTab_4_3Elc[tabIndex];
+
+      /* get approperiate exponent multiplier for specExp^3/4 combined with
+       * scfMod */
+      t = FDKaacEnc_specExpMantTableCombElc[iquantizermod][specExp];
+
+      /* multiply "mantissa" ^4/3 with exponent multiplier */
+      accu = fMult(s, t);
+
+      /* get approperiate exponent shifter */
+      specExp = FDKaacEnc_specExpTableComb[iquantizermod][specExp] -
+                1; /* -1 to avoid overflows in accu */
+
+      if ((-iquantizershift - specExp) < 0)
+        accu <<= -(-iquantizershift - specExp);
+      else
+        accu >>= -iquantizershift - specExp;
+
+      mdctSpectrum[line] = accu;
+    } else {
+      mdctSpectrum[line] = FL2FXCONST_DBL(0.0f);
+    }
+  }
+}
+
+/*****************************************************************************
+
+    functionname: FDKaacEnc_QuantizeSpectrum
+    description: quantizes the entire spectrum
+    returns:
+    input: number of scalefactor bands to be quantized, ...
+    output: quantized spectrum
+
+*****************************************************************************/
+void FDKaacEnc_QuantizeSpectrum(INT sfbCnt, INT maxSfbPerGroup, INT sfbPerGroup,
+                                const INT *sfbOffset,
+                                const FIXP_DBL *mdctSpectrum, INT globalGain,
+                                const INT *scalefactors,
+                                SHORT *quantizedSpectrum,
+                                INT dZoneQuantEnable) {
+  INT sfbOffs, sfb;
+
+  /* in FDKaacEnc_quantizeLines quaSpectrum is calculated with:
+        spec^(3/4) * 2^(-3/16*QSS) * 2^(3/4*scale) + k
+     simplify scaling calculation and reduce QSS before:
+        spec^(3/4) * 2^(-3/16*(QSS - 4*scale)) */
+
+  for (sfbOffs = 0; sfbOffs < sfbCnt; sfbOffs += sfbPerGroup)
+    for (sfb = 0; sfb < maxSfbPerGroup; sfb++) {
+      INT scalefactor = scalefactors[sfbOffs + sfb];
+
+      FDKaacEnc_quantizeLines(
+          globalGain - scalefactor, /* QSS */
+          sfbOffset[sfbOffs + sfb + 1] - sfbOffset[sfbOffs + sfb],
+          mdctSpectrum + sfbOffset[sfbOffs + sfb],
+          quantizedSpectrum + sfbOffset[sfbOffs + sfb], dZoneQuantEnable);
+    }
+}
+
+/*****************************************************************************
+
+    functionname: FDKaacEnc_calcSfbDist
+    description: calculates distortion of quantized values
+    returns: distortion
+    input: gain, number of lines to process, spectral data
+    output:
+
+*****************************************************************************/
+FIXP_DBL FDKaacEnc_calcSfbDist(const FIXP_DBL *mdctSpectrum,
+                               SHORT *quantSpectrum, INT noOfLines, INT gain,
+                               INT dZoneQuantEnable) {
+  INT i, scale;
+  FIXP_DBL xfsf;
+  FIXP_DBL diff;
+  FIXP_DBL invQuantSpec;
+
+  xfsf = FL2FXCONST_DBL(0.0f);
+
+  for (i = 0; i < noOfLines; i++) {
+    /* quantization */
+    FDKaacEnc_quantizeLines(gain, 1, &mdctSpectrum[i], &quantSpectrum[i],
+                            dZoneQuantEnable);
+
+    if (fAbs(quantSpectrum[i]) > MAX_QUANT) {
+      return FL2FXCONST_DBL(0.0f);
+    }
+    /* inverse quantization */
+    FDKaacEnc_invQuantizeLines(gain, 1, &quantSpectrum[i], &invQuantSpec);
+
+    /* dist */
+    diff = fixp_abs(fixp_abs(invQuantSpec) - fixp_abs(mdctSpectrum[i] >> 1));
+
+    scale = CountLeadingBits(diff);
+    diff = scaleValue(diff, scale);
+    diff = fPow2(diff);
+    scale = fixMin(2 * (scale - 1), DFRACT_BITS - 1);
+
+    diff = scaleValue(diff, -scale);
+
+    xfsf = xfsf + diff;
+  }
+
+  xfsf = CalcLdData(xfsf);
+
+  return xfsf;
+}
+
+/*****************************************************************************
+
+    functionname: FDKaacEnc_calcSfbQuantEnergyAndDist
+    description: calculates energy and distortion of quantized values
+    returns:
+    input: gain, number of lines to process, quantized spectral data,
+           spectral data
+    output: energy, distortion
+
+*****************************************************************************/
+void FDKaacEnc_calcSfbQuantEnergyAndDist(FIXP_DBL *mdctSpectrum,
+                                         SHORT *quantSpectrum, INT noOfLines,
+                                         INT gain, FIXP_DBL *en,
+                                         FIXP_DBL *dist) {
+  INT i, scale;
+  FIXP_DBL invQuantSpec;
+  FIXP_DBL diff;
+
+  FIXP_DBL energy = FL2FXCONST_DBL(0.0f);
+  FIXP_DBL distortion = FL2FXCONST_DBL(0.0f);
+
+  for (i = 0; i < noOfLines; i++) {
+    if (fAbs(quantSpectrum[i]) > MAX_QUANT) {
+      *en = FL2FXCONST_DBL(0.0f);
+      *dist = FL2FXCONST_DBL(0.0f);
+      return;
+    }
+
+    /* inverse quantization */
+    FDKaacEnc_invQuantizeLines(gain, 1, &quantSpectrum[i], &invQuantSpec);
+
+    /* energy */
+    energy += fPow2(invQuantSpec);
+
+    /* dist */
+    diff = fixp_abs(fixp_abs(invQuantSpec) - fixp_abs(mdctSpectrum[i] >> 1));
+
+    scale = CountLeadingBits(diff);
+    diff = scaleValue(diff, scale);
+    diff = fPow2(diff);
+
+    scale = fixMin(2 * (scale - 1), DFRACT_BITS - 1);
+
+    diff = scaleValue(diff, -scale);
+
+    distortion += diff;
+  }
+
+  *en = CalcLdData(energy) + FL2FXCONST_DBL(0.03125f);
+  *dist = CalcLdData(distortion);
+}