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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 decoder library ******************************
+
+   Author(s):   Josef Hoepfl
+
+   Description: temporal noise shaping tool
+
+*******************************************************************************/
+
+#include "aacdec_tns.h"
+#include "aac_rom.h"
+#include "FDK_bitstream.h"
+#include "channelinfo.h"
+
+#include "FDK_lpc.h"
+
+#define TNS_MAXIMUM_ORDER_AAC 12
+
+/*!
+  \brief Reset tns data
+
+  The function resets the tns data
+
+  \return  none
+*/
+void CTns_Reset(CTnsData *pTnsData) {
+  /* Note: the following FDKmemclear should not be required. */
+  FDKmemclear(pTnsData->Filter,
+              TNS_MAX_WINDOWS * TNS_MAXIMUM_FILTERS * sizeof(CFilter));
+  FDKmemclear(pTnsData->NumberOfFilters, TNS_MAX_WINDOWS * sizeof(UCHAR));
+  pTnsData->DataPresent = 0;
+  pTnsData->Active = 0;
+}
+
+void CTns_ReadDataPresentFlag(
+    HANDLE_FDK_BITSTREAM bs, /*!< pointer to bitstream */
+    CTnsData *pTnsData)      /*!< pointer to aac decoder channel info */
+{
+  pTnsData->DataPresent = (UCHAR)FDKreadBits(bs, 1);
+}
+
+/*!
+  \brief Read tns data from bitstream
+
+  The function reads the elements for tns from
+  the bitstream.
+
+  \return  none
+*/
+AAC_DECODER_ERROR CTns_Read(HANDLE_FDK_BITSTREAM bs, CTnsData *pTnsData,
+                            const CIcsInfo *pIcsInfo, const UINT flags) {
+  UCHAR n_filt, order;
+  UCHAR length, coef_res, coef_compress;
+  UCHAR window;
+  UCHAR wins_per_frame;
+  UCHAR isLongFlag;
+  UCHAR start_window;
+  AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
+
+  if (!pTnsData->DataPresent) {
+    return ErrorStatus;
+  }
+
+  {
+    start_window = 0;
+    wins_per_frame = GetWindowsPerFrame(pIcsInfo);
+    isLongFlag = IsLongBlock(pIcsInfo);
+  }
+
+  pTnsData->GainLd = 0;
+
+  for (window = start_window; window < wins_per_frame; window++) {
+    pTnsData->NumberOfFilters[window] = n_filt =
+        (UCHAR)FDKreadBits(bs, isLongFlag ? 2 : 1);
+
+    if (n_filt) {
+      int index;
+      UCHAR nextstopband;
+
+      coef_res = (UCHAR)FDKreadBits(bs, 1);
+
+      nextstopband = GetScaleFactorBandsTotal(pIcsInfo);
+
+      for (index = 0; index < n_filt; index++) {
+        CFilter *filter = &pTnsData->Filter[window][index];
+
+        length = (UCHAR)FDKreadBits(bs, isLongFlag ? 6 : 4);
+
+        if (length > nextstopband) {
+          length = nextstopband;
+        }
+
+        filter->StartBand = nextstopband - length;
+        filter->StopBand = nextstopband;
+        nextstopband = filter->StartBand;
+
+        if (flags & (AC_USAC | AC_RSVD50 | AC_RSV603DA)) {
+          /* max(Order) = 15 (long), 7 (short) */
+          filter->Order = order = (UCHAR)FDKreadBits(bs, isLongFlag ? 4 : 3);
+        } else {
+          filter->Order = order = (UCHAR)FDKreadBits(bs, isLongFlag ? 5 : 3);
+
+          if (filter->Order > TNS_MAXIMUM_ORDER) {
+            ErrorStatus = AAC_DEC_TNS_READ_ERROR;
+            return ErrorStatus;
+          }
+        }
+
+        FDK_ASSERT(order <=
+                   TNS_MAXIMUM_ORDER); /* avoid illegal memory access */
+        if (order) {
+          UCHAR coef, s_mask;
+          UCHAR i;
+          SCHAR n_mask;
+
+          static const UCHAR sgn_mask[] = {0x2, 0x4, 0x8};
+          static const SCHAR neg_mask[] = {~0x3, ~0x7, ~0xF};
+
+          filter->Direction = FDKreadBits(bs, 1) ? -1 : 1;
+
+          coef_compress = (UCHAR)FDKreadBits(bs, 1);
+
+          filter->Resolution = coef_res + 3;
+
+          s_mask = sgn_mask[coef_res + 1 - coef_compress];
+          n_mask = neg_mask[coef_res + 1 - coef_compress];
+
+          for (i = 0; i < order; i++) {
+            coef = (UCHAR)FDKreadBits(bs, filter->Resolution - coef_compress);
+            filter->Coeff[i] = (coef & s_mask) ? (coef | n_mask) : coef;
+          }
+          pTnsData->GainLd = 4;
+        }
+      }
+    }
+  }
+
+  pTnsData->Active = 1;
+
+  return ErrorStatus;
+}
+
+void CTns_ReadDataPresentUsac(HANDLE_FDK_BITSTREAM hBs, CTnsData *pTnsData0,
+                              CTnsData *pTnsData1, UCHAR *ptns_on_lr,
+                              const CIcsInfo *pIcsInfo, const UINT flags,
+                              const UINT elFlags, const int fCommonWindow) {
+  int common_tns = 0;
+
+  if (fCommonWindow) {
+    common_tns = FDKreadBit(hBs);
+  }
+  { *ptns_on_lr = FDKreadBit(hBs); }
+  if (common_tns) {
+    pTnsData0->DataPresent = 1;
+    CTns_Read(hBs, pTnsData0, pIcsInfo, flags);
+
+    pTnsData0->DataPresent = 0;
+    pTnsData0->Active = 1;
+    *pTnsData1 = *pTnsData0;
+  } else {
+    int tns_present_both;
+
+    tns_present_both = FDKreadBit(hBs);
+    if (tns_present_both) {
+      pTnsData0->DataPresent = 1;
+      pTnsData1->DataPresent = 1;
+    } else {
+      pTnsData1->DataPresent = FDKreadBit(hBs);
+      pTnsData0->DataPresent = !pTnsData1->DataPresent;
+    }
+  }
+}
+
+/*!
+  \brief Apply tns to spectral lines
+
+  The function applies the tns to the spectrum,
+
+  \return  none
+*/
+void CTns_Apply(CTnsData *RESTRICT pTnsData, /*!< pointer to aac decoder info */
+                const CIcsInfo *pIcsInfo, SPECTRAL_PTR pSpectralCoefficient,
+                const SamplingRateInfo *pSamplingRateInfo,
+                const INT granuleLength, const UCHAR nbands,
+                const UCHAR igf_active, const UINT flags) {
+  int window, index, start, stop, size, start_window, wins_per_frame;
+
+  if (pTnsData->Active) {
+    C_AALLOC_SCRATCH_START(coeff, FIXP_TCC, TNS_MAXIMUM_ORDER)
+
+    {
+      start_window = 0;
+      wins_per_frame = GetWindowsPerFrame(pIcsInfo);
+    }
+
+    for (window = start_window; window < wins_per_frame; window++) {
+      FIXP_DBL *pSpectrum;
+
+      { pSpectrum = SPEC(pSpectralCoefficient, window, granuleLength); }
+
+      for (index = 0; index < pTnsData->NumberOfFilters[window]; index++) {
+        CFilter *filter = &pTnsData->Filter[window][index];
+
+        if (filter->Order > 0) {
+          FIXP_TCC *pCoeff;
+          UCHAR tns_max_bands;
+
+          pCoeff = coeff;
+          if (filter->Resolution == 3) {
+            int i;
+            for (i = 0; i < filter->Order; i++)
+              *pCoeff++ = FDKaacDec_tnsCoeff3[filter->Coeff[i] + 4];
+          } else {
+            int i;
+            for (i = 0; i < filter->Order; i++)
+              *pCoeff++ = FDKaacDec_tnsCoeff4[filter->Coeff[i] + 8];
+          }
+
+          switch (granuleLength) {
+            case 480:
+              tns_max_bands =
+                  tns_max_bands_tbl_480[pSamplingRateInfo->samplingRateIndex];
+              break;
+            case 512:
+              tns_max_bands =
+                  tns_max_bands_tbl_512[pSamplingRateInfo->samplingRateIndex];
+              break;
+            default:
+              tns_max_bands = GetMaximumTnsBands(
+                  pIcsInfo, pSamplingRateInfo->samplingRateIndex);
+              /* See redefinition of TNS_MAX_BANDS table */
+              if ((flags & (AC_USAC | AC_RSVD50 | AC_RSV603DA)) &&
+                  (pSamplingRateInfo->samplingRateIndex > 5)) {
+                tns_max_bands += 1;
+              }
+              break;
+          }
+
+          start = fixMin(fixMin(filter->StartBand, tns_max_bands), nbands);
+
+          start = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo)[start];
+
+          if (igf_active) {
+            stop = fixMin(filter->StopBand, nbands);
+          } else {
+            stop = fixMin(fixMin(filter->StopBand, tns_max_bands), nbands);
+          }
+
+          stop = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo)[stop];
+
+          size = stop - start;
+
+          if (size) {
+            C_ALLOC_SCRATCH_START(state, FIXP_DBL, TNS_MAXIMUM_ORDER)
+
+            FDKmemclear(state, TNS_MAXIMUM_ORDER * sizeof(FIXP_DBL));
+            CLpc_SynthesisLattice(pSpectrum + start, size, 0, 0,
+                                  filter->Direction, coeff, filter->Order,
+                                  state);
+
+            C_ALLOC_SCRATCH_END(state, FIXP_DBL, TNS_MAXIMUM_ORDER)
+          }
+        }
+      }
+    }
+    C_AALLOC_SCRATCH_END(coeff, FIXP_TCC, TNS_MAXIMUM_ORDER)
+  }
+}