Upgrade to FDKv2

Bug: 71430241
Test: CTS DecoderTest and DecoderTestAacDrc

original-Change-Id: Iaa20f749b8a04d553b20247cfe1a8930ebbabe30

Apply clang-format also on header files.

original-Change-Id: I14de1ef16bbc79ec0283e745f98356a10efeb2e4

Fixes for MPEG-D DRC

original-Change-Id: If1de2d74bbbac84b3f67de3b88b83f6a23b8a15c

Catch unsupported tw_mdct at an early stage

original-Change-Id: Ied9dd00d754162a0e3ca1ae3e6b854315d818afe

Fixing PVC transition frames

original-Change-Id: Ib75725abe39252806c32d71176308f2c03547a4e

Move qmf bands sanity check

original-Change-Id: Iab540c3013c174d9490d2ae100a4576f51d8dbc4

Initialize scaling variable

original-Change-Id: I3c4087101b70e998c71c1689b122b0d7762e0f9e

Add 16 qmf band configuration to getSlotNrgHQ()

original-Change-Id: I49a5d30f703a1b126ff163df9656db2540df21f1

Always apply byte alignment at the end of the AudioMuxElement

original-Change-Id: I42d560287506d65d4c3de8bfe3eb9a4ebeb4efc7

Setup SBR element only if no parse error exists

original-Change-Id: I1915b73704bc80ab882b9173d6bec59cbd073676

Additional array index check in HCR

original-Change-Id: I18cc6e501ea683b5009f1bbee26de8ddd04d8267

Fix fade-in index selection in concealment module

original-Change-Id: Ibf802ed6ed8c05e9257e1f3b6d0ac1162e9b81c1

Enable explicit backward compatible parser for AAC_LD

original-Change-Id: I27e9c678dcb5d40ed760a6d1e06609563d02482d

Skip spatial specific config in explicit backward compatible ASC

original-Change-Id: Iff7cc365561319e886090cedf30533f562ea4d6e

Update flags description in decoder API

original-Change-Id: I9a5b4f8da76bb652f5580cbd3ba9760425c43830

Add QMF domain reset function

original-Change-Id: I4f89a8a2c0277d18103380134e4ed86996e9d8d6

DRC upgrade v2.1.0

original-Change-Id: I5731c0540139dab220094cd978ef42099fc45b74

Fix integer overflow in sqrtFixp_lookup()

original-Change-Id: I429a6f0d19aa2cc957e0f181066f0ca73968c914

Fix integer overflow in invSqrtNorm2()

original-Change-Id: I84de5cbf9fb3adeb611db203fe492fabf4eb6155

Fix integer overflow in GenerateRandomVector()

original-Change-Id: I3118a641008bd9484d479e5b0b1ee2b5d7d44d74

Fix integer overflow in adjustTimeSlot_EldGrid()

original-Change-Id: I29d503c247c5c8282349b79df940416a512fb9d5

Fix integer overflow in FDKsbrEnc_codeEnvelope()

original-Change-Id: I6b34b61ebb9d525b0c651ed08de2befc1f801449

Follow-up on: Fix integer overflow in adjustTimeSlot_EldGrid()

original-Change-Id: I6f8f578cc7089e5eb7c7b93e580b72ca35ad689a

Fix integer overflow in get_pk_v2()

original-Change-Id: I63375bed40d45867f6eeaa72b20b1f33e815938c

Fix integer overflow in Syn_filt_zero()

original-Change-Id: Ie0c02fdfbe03988f9d3b20d10cd9fe4c002d1279

Fix integer overflow in CFac_CalcFacSignal()

original-Change-Id: Id2d767c40066c591b51768e978eb8af3b803f0c5

Fix integer overflow in FDKaacEnc_FDKaacEnc_calcPeNoAH()

original-Change-Id: Idcbd0f4a51ae2550ed106aa6f3d678d1f9724841

Fix integer overflow in sbrDecoder_calculateGainVec()

original-Change-Id: I7081bcbe29c5cede9821b38d93de07c7add2d507

Fix integer overflow in CLpc_SynthesisLattice()

original-Change-Id: I4a95ddc18de150102352d4a1845f06094764c881

Fix integer overflow in Pred_Lt4()

original-Change-Id: I4dbd012b2de7d07c3e70a47b92e3bfae8dbc750a

Fix integer overflow in FDKsbrEnc_InitSbrFastTransientDetector()

original-Change-Id: I788cbec1a4a00f44c2f3a72ad7a4afa219807d04

Fix unsigned integer overflow in FDKaacEnc_WriteBitstream()

original-Change-Id: I68fc75166e7d2cd5cd45b18dbe3d8c2a92f1822a

Fix unsigned integer overflow in FDK_MetadataEnc_Init()

original-Change-Id: Ie8d025f9bcdb2442c704bd196e61065c03c10af4

Fix overflow in pseudo random number generators

original-Change-Id: I3e2551ee01356297ca14e3788436ede80bd5513c

Fix unsigned integer overflow in sbrDecoder_Parse()

original-Change-Id: I3f231b2f437e9c37db4d5b964164686710eee971

Fix unsigned integer overflow in longsub()

original-Change-Id: I73c2bc50415cac26f1f5a29e125bbe75f9180a6e

Fix unsigned integer overflow in CAacDecoder_DecodeFrame()

original-Change-Id: Ifce2db4b1454b46fa5f887e9d383f1cc43b291e4

Fix overflow at CLpdChannelStream_Read()

original-Change-Id: Idb9d822ce3a4272e4794b643644f5434e2d4bf3f

Fix unsigned integer overflow in Hcr_State_BODY_SIGN_ESC__ESC_WORD()

original-Change-Id: I1ccf77c0015684b85534c5eb97162740a870b71c

Fix unsigned integer overflow in UsacConfig_Parse()

original-Change-Id: Ie6d27f84b6ae7eef092ecbff4447941c77864d9f

Fix unsigned integer overflow in aacDecoder_drcParse()

original-Change-Id: I713f28e883eea3d70b6fa56a7b8f8c22bcf66ca0

Fix unsigned integer overflow in aacDecoder_drcReadCompression()

original-Change-Id: Ia34dfeb88c4705c558bce34314f584965cafcf7a

Fix unsigned integer overflow in CDataStreamElement_Read()

original-Change-Id: Iae896cc1d11f0a893d21be6aa90bd3e60a2c25f0

Fix unsigned integer overflow in transportDec_AdjustEndOfAccessUnit()

original-Change-Id: I64cf29a153ee784bb4a16fdc088baabebc0007dc

Fix unsigned integer overflow in transportDec_GetAuBitsRemaining()

original-Change-Id: I975b3420faa9c16a041874ba0db82e92035962e4

Fix unsigned integer overflow in extractExtendedData()

original-Change-Id: I2a59eb09e2053cfb58dfb75fcecfad6b85a80a8f

Fix signed integer overflow in CAacDecoder_ExtPayloadParse()

original-Change-Id: I4ad5ca4e3b83b5d964f1c2f8c5e7b17c477c7929

Fix unsigned integer overflow in CAacDecoder_DecodeFrame()

original-Change-Id: I29a39df77d45c52a0c9c5c83c1ba81f8d0f25090

Follow-up on: Fix integer overflow in CLpc_SynthesisLattice()

original-Change-Id: I8fb194ffc073a3432a380845be71036a272d388f

Fix signed integer overflow in _interpolateDrcGain()

original-Change-Id: I879ec9ab14005069a7c47faf80e8bc6e03d22e60

Fix unsigned integer overflow in FDKreadBits()

original-Change-Id: I1f47a6a8037ff70375aa8844947d5681bb4287ad

Fix unsigned integer overflow in FDKbyteAlign()

original-Change-Id: Id5f3a11a0c9e50fc6f76ed6c572dbd4e9f2af766

Fix unsigned integer overflow in FDK_get32()

original-Change-Id: I9d33b8e97e3d38cbb80629cb859266ca0acdce96

Fix unsigned integer overflow in FDK_pushBack()

original-Change-Id: Ic87f899bc8c6acf7a377a8ca7f3ba74c3a1e1c19

Fix unsigned integer overflow in FDK_pushForward()

original-Change-Id: I3b754382f6776a34be1602e66694ede8e0b8effc

Fix unsigned integer overflow in ReadPsData()

original-Change-Id: I25361664ba8139e32bbbef2ca8c106a606ce9c37

Fix signed integer overflow in E_UTIL_residu()

original-Change-Id: I8c3abd1f437ee869caa8fb5903ce7d3d641b6aad

REVERT: Follow-up on: Integer overflow in CLpc_SynthesisLattice().

original-Change-Id: I3d340099acb0414795c8dfbe6362bc0a8f045f9b

Follow-up on: Fix integer overflow in CLpc_SynthesisLattice()

original-Change-Id: I4aedb8b3a187064e9f4d985175aa55bb99cc7590

Follow-up on: Fix unsigned integer overflow in aacDecoder_drcParse()

original-Change-Id: I2aa2e13916213bf52a67e8b0518e7bf7e57fb37d

Fix integer overflow in acelp

original-Change-Id: Ie6390c136d84055f8b728aefbe4ebef6e029dc77

Fix unsigned integer overflow in aacDecoder_UpdateBitStreamCounters()

original-Change-Id: I391ffd97ddb0b2c184cba76139bfb356a3b4d2e2

Adjust concealment default settings

original-Change-Id: I6a95db935a327c47df348030bcceafcb29f54b21

Saturate estimatedStartPos

original-Change-Id: I27be2085e0ae83ec9501409f65e003f6bcba1ab6

Negative shift exponent in _interpolateDrcGain()

original-Change-Id: I18edb26b26d002aafd5e633d4914960f7a359c29

Negative shift exponent in calculateICC()

original-Change-Id: I3dcd2ae98d2eb70ee0d59750863cbb2a6f4f8aba

Too large shift exponent in FDK_put()

original-Change-Id: Ib7d9aaa434d2d8de4a13b720ca0464b31ca9b671

Too large shift exponent in CalcInvLdData()

original-Change-Id: I43e6e78d4cd12daeb1dcd5d82d1798bdc2550262

Member access within null pointer of type SBR_CHANNEL

original-Change-Id: Idc5e4ea8997810376d2f36bbdf628923b135b097

Member access within null pointer of type CpePersistentData

original-Change-Id: Ib6c91cb0d37882768e5baf63324e429589de0d9d

Member access within null pointer FDKaacEnc_psyMain()

original-Change-Id: I7729b7f4479970531d9dc823abff63ca52e01997

Member access within null pointer FDKaacEnc_GetPnsParam()

original-Change-Id: I9aa3b9f3456ae2e0f7483dbd5b3dde95fc62da39

Member access within null pointer FDKsbrEnc_EnvEncodeFrame()

original-Change-Id: I67936f90ea714e90b3e81bc0dd1472cc713eb23a

Add HCR sanity check

original-Change-Id: I6c1d9732ebcf6af12f50b7641400752f74be39f7

Fix memory issue for HBE edge case with 8:3 SBR

original-Change-Id: I11ea58a61e69fbe8bf75034b640baee3011e63e9

Additional SBR parametrization sanity check for ELD

original-Change-Id: Ie26026fbfe174c2c7b3691f6218b5ce63e322140

Add MPEG-D DRC channel layout check

original-Change-Id: Iea70a74f171b227cce636a9eac4ba662777a2f72

Additional out-of-bounds checks in MPEG-D DRC

original-Change-Id: Ife4a8c3452c6fde8a0a09e941154a39a769777d4

Change-Id: Ic63cb2f628720f54fe9b572b0cb528e2599c624e

1 files changed, 714 insertions, 0 deletions

diff --git a/libDRCdec/src/drcGainDec_preprocess.cpp b/libDRCdec/src/drcGainDec_preprocess.cpp
new file mode 100644
index 0000000..7919589
--- /dev/null
+++ b/libDRCdec/src/drcGainDec_preprocess.cpp
@@ -0,0 +1,714 @@
+/* -----------------------------------------------------------------------------
+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
+----------------------------------------------------------------------------- */
+
+/************************* MPEG-D DRC decoder library **************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+#include "drcDec_types.h"
+#include "drcDec_gainDecoder.h"
+#include "drcGainDec_preprocess.h"
+#include "drcDec_tools.h"
+#include "FDK_matrixCalloc.h"
+#include "drcDec_rom.h"
+
+#define SLOPE_FACTOR_DB_TO_LINEAR \
+  FL2FXCONST_DBL(0.1151f * (float)(1 << 3)) /* ln(10) / 20 */
+
+typedef struct {
+  int drcSetEffect;
+  DUCKING_MODIFICATION* pDMod;
+  GAIN_MODIFICATION* pGMod;
+  int drcCharacteristicPresent;
+  CHARACTERISTIC_FORMAT characteristicFormatSource[2];
+  const CUSTOM_DRC_CHAR* pCCharSource[2];
+  CHARACTERISTIC_FORMAT characteristicFormatTarget[2];
+  const CUSTOM_DRC_CHAR* pCCharTarget[2];
+  int slopeIsNegative;
+  int limiterPeakTargetPresent;
+  FIXP_SGL limiterPeakTarget;
+  FIXP_DBL loudnessNormalizationGainDb;
+  FIXP_SGL compress;
+  FIXP_SGL boost;
+} NODE_MODIFICATION;
+
+static DRC_ERROR _getCicpCharacteristic(
+    const int cicpCharacteristic,
+    CHARACTERISTIC_FORMAT pCharacteristicFormat[2],
+    const CUSTOM_DRC_CHAR* pCCharSource[2]) {
+  if ((cicpCharacteristic < 1) || (cicpCharacteristic > 11)) {
+    return DE_NOT_OK;
+  }
+
+  if (cicpCharacteristic < 7) { /* sigmoid characteristic */
+    pCharacteristicFormat[CS_LEFT] = CF_SIGMOID;
+    pCCharSource[CS_LEFT] =
+        (const CUSTOM_DRC_CHAR*)(&cicpDrcCharSigmoidLeft[cicpCharacteristic -
+                                                         1]);
+    pCharacteristicFormat[CS_RIGHT] = CF_SIGMOID;
+    pCCharSource[CS_RIGHT] =
+        (const CUSTOM_DRC_CHAR*)(&cicpDrcCharSigmoidRight[cicpCharacteristic -
+                                                          1]);
+  } else { /* nodes characteristic */
+    pCharacteristicFormat[CS_LEFT] = CF_NODES;
+    pCCharSource[CS_LEFT] =
+        (const CUSTOM_DRC_CHAR*)(&cicpDrcCharNodesLeft[cicpCharacteristic - 7]);
+    pCharacteristicFormat[CS_RIGHT] = CF_NODES;
+    pCCharSource[CS_RIGHT] =
+        (const CUSTOM_DRC_CHAR*)(&cicpDrcCharNodesRight[cicpCharacteristic -
+                                                        7]);
+  }
+  return DE_OK;
+}
+
+static int _getSign(FIXP_SGL in) {
+  if (in > (FIXP_DBL)0) return 1;
+  if (in < (FIXP_DBL)0) return -1;
+  return 0;
+}
+
+static DRC_ERROR _getSlopeSign(const CHARACTERISTIC_FORMAT drcCharFormat,
+                               const CUSTOM_DRC_CHAR* pCChar, int* pSlopeSign) {
+  if (drcCharFormat == CF_SIGMOID) {
+    *pSlopeSign = (pCChar->sigmoid.flipSign ? 1 : -1);
+  } else {
+    int k, slopeSign = 0, tmp_slopeSign;
+    for (k = 0; k < pCChar->nodes.characteristicNodeCount; k++) {
+      if (pCChar->nodes.nodeLevel[k + 1] > pCChar->nodes.nodeLevel[k]) {
+        tmp_slopeSign =
+            _getSign(pCChar->nodes.nodeGain[k + 1] - pCChar->nodes.nodeGain[k]);
+      } else {
+        tmp_slopeSign = -_getSign(pCChar->nodes.nodeGain[k + 1] -
+                                  pCChar->nodes.nodeGain[k]);
+      }
+      if ((slopeSign || tmp_slopeSign) && (slopeSign == -tmp_slopeSign))
+        return DE_NOT_OK; /* DRC characteristic is not invertible */
+      else
+        slopeSign = tmp_slopeSign;
+    }
+    *pSlopeSign = slopeSign;
+  }
+  return DE_OK;
+}
+
+static DRC_ERROR _isSlopeNegative(const CHARACTERISTIC_FORMAT drcCharFormat[2],
+                                  const CUSTOM_DRC_CHAR* pCChar[2],
+                                  int* pSlopeIsNegative) {
+  DRC_ERROR err = DE_OK;
+  int slopeSign[2] = {0, 0};
+
+  err = _getSlopeSign(drcCharFormat[CS_LEFT], pCChar[CS_LEFT],
+                      &slopeSign[CS_LEFT]);
+  if (err) return err;
+
+  err = _getSlopeSign(drcCharFormat[CS_RIGHT], pCChar[CS_RIGHT],
+                      &slopeSign[CS_RIGHT]);
+  if (err) return err;
+
+  if ((slopeSign[CS_LEFT] || slopeSign[CS_RIGHT]) &&
+      (slopeSign[CS_LEFT] == -slopeSign[CS_RIGHT]))
+    return DE_NOT_OK; /* DRC characteristic is not invertible */
+
+  *pSlopeIsNegative = (slopeSign[CS_LEFT] < 0);
+  return DE_OK;
+}
+
+static DRC_ERROR _prepareDrcCharacteristic(const DRC_CHARACTERISTIC* pDChar,
+                                           DRC_COEFFICIENTS_UNI_DRC* pCoef,
+                                           const int b,
+                                           NODE_MODIFICATION* pNodeMod) {
+  DRC_ERROR err = DE_OK;
+  pNodeMod->drcCharacteristicPresent = pDChar->present;
+  if (pNodeMod->drcCharacteristicPresent) {
+    if (pDChar->isCICP == 1) {
+      err = _getCicpCharacteristic(pDChar->cicpIndex,
+                                   pNodeMod->characteristicFormatSource,
+                                   pNodeMod->pCCharSource);
+      if (err) return err;
+    } else {
+      pNodeMod->characteristicFormatSource[CS_LEFT] =
+          (CHARACTERISTIC_FORMAT)
+              pCoef->characteristicLeftFormat[pDChar->custom.left];
+      pNodeMod->pCCharSource[CS_LEFT] =
+          &(pCoef->customCharacteristicLeft[pDChar->custom.left]);
+      pNodeMod->characteristicFormatSource[CS_RIGHT] =
+          (CHARACTERISTIC_FORMAT)
+              pCoef->characteristicRightFormat[pDChar->custom.right];
+      pNodeMod->pCCharSource[CS_RIGHT] =
+          &(pCoef->customCharacteristicRight[pDChar->custom.right]);
+    }
+    err = _isSlopeNegative(pNodeMod->characteristicFormatSource,
+                           pNodeMod->pCCharSource, &pNodeMod->slopeIsNegative);
+    if (err) return err;
+
+    if (pNodeMod->pGMod != NULL) {
+      if (pNodeMod->pGMod[b].targetCharacteristicLeftPresent) {
+        pNodeMod->characteristicFormatTarget[CS_LEFT] =
+            (CHARACTERISTIC_FORMAT)pCoef->characteristicLeftFormat
+                [pNodeMod->pGMod[b].targetCharacteristicLeftIndex];
+        pNodeMod->pCCharTarget[CS_LEFT] =
+            &(pCoef->customCharacteristicLeft
+                  [pNodeMod->pGMod[b].targetCharacteristicLeftIndex]);
+      }
+      if (pNodeMod->pGMod[b].targetCharacteristicRightPresent) {
+        pNodeMod->characteristicFormatTarget[CS_RIGHT] =
+            (CHARACTERISTIC_FORMAT)pCoef->characteristicRightFormat
+                [pNodeMod->pGMod[b].targetCharacteristicRightIndex];
+        pNodeMod->pCCharTarget[CS_RIGHT] =
+            &(pCoef->customCharacteristicRight
+                  [pNodeMod->pGMod[b].targetCharacteristicRightIndex]);
+      }
+    }
+  }
+  return DE_OK;
+}
+
+static DRC_ERROR _compressorIO_sigmoid_common(
+    const FIXP_DBL tmp,               /* e = 7 */
+    const FIXP_DBL gainDbLimit,       /* e = 6 */
+    const FIXP_DBL exp,               /* e = 5 */
+    const int inverse, FIXP_DBL* out) /* e = 7 */
+{
+  FIXP_DBL x, tmp1, tmp2, invExp, denom;
+  int e_x, e_tmp1, e_tmp2, e_invExp, e_denom, e_out;
+
+  if (exp < FL2FXCONST_DBL(1.0f / (float)(1 << 5))) {
+    return DE_NOT_OK;
+  }
+
+  /* x = tmp / gainDbLimit; */
+  x = fDivNormSigned(tmp, gainDbLimit, &e_x);
+  e_x += 7 - 6;
+  if (x < (FIXP_DBL)0) {
+    return DE_NOT_OK;
+  }
+
+  /* out = tmp / pow(1.0f +/- pow(x, exp), 1.0f/exp); */
+  tmp1 = fPow(x, e_x, exp, 5, &e_tmp1);
+  if (inverse) tmp1 = -tmp1;
+  tmp2 = fAddNorm(FL2FXCONST_DBL(1.0f / (float)(1 << 1)), 1, tmp1, e_tmp1,
+                  &e_tmp2);
+  invExp = fDivNorm(FL2FXCONST_DBL(1.0f / (float)(1 << 1)), exp, &e_invExp);
+  e_invExp += 1 - 5;
+  denom = fPow(tmp2, e_tmp2, invExp, e_invExp, &e_denom);
+  *out = fDivNormSigned(tmp, denom, &e_out);
+  e_out += 7 - e_denom;
+  *out = scaleValueSaturate(*out, e_out - 7);
+  return DE_OK;
+}
+
+static DRC_ERROR _compressorIO_sigmoid(const CUSTOM_DRC_CHAR_SIGMOID* pCChar,
+                                       const FIXP_DBL inLevelDb, /* e = 7 */
+                                       FIXP_DBL* outGainDb)      /* e = 7 */
+{
+  FIXP_DBL tmp;
+  FIXP_SGL exp = pCChar->exp;
+  DRC_ERROR err = DE_OK;
+
+  tmp = fMultDiv2(DRC_INPUT_LOUDNESS_TARGET - inLevelDb, pCChar->ioRatio);
+  tmp = SATURATE_LEFT_SHIFT(tmp, 2 + 1, DFRACT_BITS);
+  if (exp < (FIXP_SGL)MAXVAL_SGL) {
+    /* x = tmp / gainDbLimit; */
+    /* *outGainDb = tmp / pow(1.0f + pow(x, exp), 1.0f/exp); */
+    err = _compressorIO_sigmoid_common(tmp, FX_SGL2FX_DBL(pCChar->gain),
+                                       FX_SGL2FX_DBL(exp), 0, outGainDb);
+    if (err) return err;
+  } else {
+    *outGainDb =
+        tmp; /* scaling of outGainDb (7) is equal to scaling of tmp (7) */
+  }
+  if (pCChar->flipSign == 1) {
+    *outGainDb = -*outGainDb;
+  }
+  return err;
+}
+
+static DRC_ERROR _compressorIO_sigmoid_inverse(
+    const CUSTOM_DRC_CHAR_SIGMOID* pCChar, const FIXP_SGL gainDb,
+    FIXP_DBL* inLev) {
+  DRC_ERROR err = DE_OK;
+  FIXP_SGL ioRatio = pCChar->ioRatio;
+  FIXP_SGL exp = pCChar->exp;
+  FIXP_DBL tmp = FX_SGL2FX_DBL(gainDb), tmp_out;
+  int e_out;
+
+  if (pCChar->flipSign == 1) {
+    tmp = -tmp;
+  }
+  if (exp < (FIXP_SGL)MAXVAL_SGL) {
+    /* x = tmp / gainDbLimit; */
+    /* tmp = tmp / pow(1.0f - pow(x, exp), 1.0f / exp); */
+    err = _compressorIO_sigmoid_common(tmp, FX_SGL2FX_DBL(pCChar->gain),
+                                       FX_SGL2FX_DBL(exp), 1, &tmp);
+    if (err) return err;
+  }
+  if (ioRatio == (FIXP_SGL)0) {
+    return DE_NOT_OK;
+  }
+  tmp_out = fDivNormSigned(tmp, FX_SGL2FX_DBL(ioRatio), &e_out);
+  e_out += 7 - 2;
+  tmp_out = fAddNorm(DRC_INPUT_LOUDNESS_TARGET, 7, -tmp_out, e_out, &e_out);
+  *inLev = scaleValueSaturate(tmp_out, e_out - 7);
+
+  return err;
+}
+
+static DRC_ERROR _compressorIO_nodes(const CUSTOM_DRC_CHAR_NODES* pCChar,
+                                     const FIXP_DBL inLevelDb, /* e = 7 */
+                                     FIXP_DBL* outGainDb)      /* e = 7 */
+{
+  int n;
+  FIXP_DBL w;
+  const FIXP_SGL* nodeLevel = pCChar->nodeLevel;
+  const FIXP_SGL* nodeGain = pCChar->nodeGain;
+
+  if (inLevelDb < DRC_INPUT_LOUDNESS_TARGET) {
+    for (n = 0; n < pCChar->characteristicNodeCount; n++) {
+      if ((inLevelDb <= FX_SGL2FX_DBL(nodeLevel[n])) &&
+          (inLevelDb > FX_SGL2FX_DBL(nodeLevel[n + 1]))) {
+        w = fDivNorm(inLevelDb - FX_SGL2FX_DBL(nodeLevel[n + 1]),
+                     FX_SGL2FX_DBL(nodeLevel[n] - nodeLevel[n + 1]));
+        *outGainDb = fMult(w, nodeGain[n]) +
+                     fMult((FIXP_DBL)MAXVAL_DBL - w, nodeGain[n + 1]);
+        /* *outGainDb = (w * nodeGain[n] + (1.0-w) * nodeGain[n+1]); */
+        return DE_OK;
+      }
+    }
+  } else {
+    for (n = 0; n < pCChar->characteristicNodeCount; n++) {
+      if ((inLevelDb >= FX_SGL2FX_DBL(nodeLevel[n])) &&
+          (inLevelDb < FX_SGL2FX_DBL(nodeLevel[n + 1]))) {
+        w = fDivNorm(FX_SGL2FX_DBL(nodeLevel[n + 1]) - inLevelDb,
+                     FX_SGL2FX_DBL(nodeLevel[n + 1] - nodeLevel[n]));
+        *outGainDb = fMult(w, nodeGain[n]) +
+                     fMult((FIXP_DBL)MAXVAL_DBL - w, nodeGain[n + 1]);
+        /* *outGainDb = (w * nodeGain[n] + (1.0-w) * nodeGain[n+1]); */
+        return DE_OK;
+      }
+    }
+  }
+  *outGainDb = FX_SGL2FX_DBL(nodeGain[pCChar->characteristicNodeCount]);
+  return DE_OK;
+}
+
+static DRC_ERROR _compressorIO_nodes_inverse(
+    const CUSTOM_DRC_CHAR_NODES* pCChar, const FIXP_SGL gainDb, /* e = 7 */
+    FIXP_DBL* inLev)                                            /* e = 7 */
+{
+  int n;
+  int k;
+  FIXP_DBL w;
+  int gainIsNegative = 0;
+  const FIXP_SGL* nodeLevel = pCChar->nodeLevel;
+  const FIXP_SGL* nodeGain = pCChar->nodeGain;
+  int nodeCount = pCChar->characteristicNodeCount;
+  for (k = 0; k < nodeCount; k++) {
+    if (pCChar->nodeGain[k + 1] < (FIXP_SGL)0) {
+      gainIsNegative = 1;
+    }
+  }
+  if (gainIsNegative == 1) {
+    if (gainDb <= nodeGain[nodeCount]) {
+      *inLev = FX_SGL2FX_DBL(nodeLevel[nodeCount]);
+    } else {
+      if (gainDb >= (FIXP_SGL)0) {
+        *inLev = DRC_INPUT_LOUDNESS_TARGET;
+      } else {
+        for (n = 0; n < nodeCount; n++) {
+          if ((gainDb <= nodeGain[n]) && (gainDb > nodeGain[n + 1])) {
+            FIXP_SGL gainDelta = nodeGain[n] - nodeGain[n + 1];
+            if (gainDelta == (FIXP_SGL)0) {
+              *inLev = FX_SGL2FX_DBL(nodeLevel[n]);
+              return DE_OK;
+            }
+            w = fDivNorm(gainDb - nodeGain[n + 1], gainDelta);
+            *inLev = fMult(w, nodeLevel[n]) +
+                     fMult((FIXP_DBL)MAXVAL_DBL - w, nodeLevel[n + 1]);
+            /* *inLev = (w * nodeLevel[n] + (1.0-w) * nodeLevel[n+1]); */
+            return DE_OK;
+          }
+        }
+        *inLev = FX_SGL2FX_DBL(nodeLevel[nodeCount]);
+      }
+    }
+  } else {
+    if (gainDb >= nodeGain[nodeCount]) {
+      *inLev = FX_SGL2FX_DBL(nodeLevel[nodeCount]);
+    } else {
+      if (gainDb <= (FIXP_SGL)0) {
+        *inLev = DRC_INPUT_LOUDNESS_TARGET;
+      } else {
+        for (n = 0; n < nodeCount; n++) {
+          if ((gainDb >= nodeGain[n]) && (gainDb < nodeGain[n + 1])) {
+            FIXP_SGL gainDelta = nodeGain[n + 1] - nodeGain[n];
+            if (gainDelta == (FIXP_SGL)0) {
+              *inLev = FX_SGL2FX_DBL(nodeLevel[n]);
+              return DE_OK;
+            }
+            w = fDivNorm(nodeGain[n + 1] - gainDb, gainDelta);
+            *inLev = fMult(w, nodeLevel[n]) +
+                     fMult((FIXP_DBL)MAXVAL_DBL - w, nodeLevel[n + 1]);
+            /* *inLev = (w * nodeLevel[n] + (1.0-w) * nodeLevel[n+1]); */
+            return DE_OK;
+          }
+        }
+        *inLev = FX_SGL2FX_DBL(nodeLevel[nodeCount]);
+      }
+    }
+  }
+  return DE_OK;
+}
+
+static DRC_ERROR _mapGain(const CHARACTERISTIC_FORMAT pCCharFormatSource,
+                          const CUSTOM_DRC_CHAR* pCCharSource,
+                          const CHARACTERISTIC_FORMAT pCCharFormatTarget,
+                          const CUSTOM_DRC_CHAR* pCCharTarget,
+                          const FIXP_SGL gainInDb, /* e = 7 */
+                          FIXP_DBL* gainOutDb)     /* e = 7 */
+{
+  FIXP_DBL inLevel = (FIXP_DBL)0;
+  DRC_ERROR err = DE_OK;
+
+  switch (pCCharFormatSource) {
+    case CF_SIGMOID:
+      err = _compressorIO_sigmoid_inverse(
+          (const CUSTOM_DRC_CHAR_SIGMOID*)pCCharSource, gainInDb, &inLevel);
+      if (err) return err;
+      break;
+    case CF_NODES:
+      err = _compressorIO_nodes_inverse(
+          (const CUSTOM_DRC_CHAR_NODES*)pCCharSource, gainInDb, &inLevel);
+      if (err) return err;
+      break;
+    default:
+      return DE_NOT_OK;
+  }
+  switch (pCCharFormatTarget) {
+    case CF_SIGMOID:
+      err = _compressorIO_sigmoid((const CUSTOM_DRC_CHAR_SIGMOID*)pCCharTarget,
+                                  inLevel, gainOutDb);
+      if (err) return err;
+      break;
+    case CF_NODES:
+      err = _compressorIO_nodes((const CUSTOM_DRC_CHAR_NODES*)pCCharTarget,
+                                inLevel, gainOutDb);
+      if (err) return err;
+      break;
+    default:
+      break;
+  }
+  return DE_OK;
+}
+
+static DRC_ERROR _toLinear(
+    const NODE_MODIFICATION* nodeMod, const int drcBand,
+    const FIXP_SGL gainDb,  /* in: gain value in dB, e = 7 */
+    const FIXP_SGL slopeDb, /* in: slope value in dB/deltaTmin, e = 2 */
+    FIXP_DBL* gainLin,      /* out: linear gain value, e = 7 */
+    FIXP_DBL* slopeLin)     /* out: linear slope value, e = 7 */
+{
+  FIXP_DBL gainRatio_m = FL2FXCONST_DBL(1.0f / (float)(1 << 1));
+  GAIN_MODIFICATION* pGMod = NULL;
+  DUCKING_MODIFICATION* pDMod = nodeMod->pDMod;
+  FIXP_DBL tmp_dbl, gainDb_modified, gainDb_offset, gainDb_out, gainLin_m,
+      slopeLin_m;
+  int gainLin_e, gainRatio_e = 1, gainDb_out_e;
+  if (nodeMod->pGMod != NULL) {
+    pGMod = &(nodeMod->pGMod[drcBand]);
+  }
+  if (((nodeMod->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) == 0) &&
+      (nodeMod->drcSetEffect != EB_FADE) &&
+      (nodeMod->drcSetEffect != EB_CLIPPING)) {
+    DRC_ERROR err = DE_OK;
+    FIXP_DBL gainDbMapped;
+
+    if ((pGMod != NULL) && (nodeMod->drcCharacteristicPresent)) {
+      if (((gainDb > (FIXP_SGL)0) && nodeMod->slopeIsNegative) ||
+          ((gainDb < (FIXP_SGL)0) && !nodeMod->slopeIsNegative)) {
+        /* left side */
+        if (pGMod->targetCharacteristicLeftPresent == 1) {
+          err = _mapGain(nodeMod->characteristicFormatSource[CS_LEFT],
+                         nodeMod->pCCharSource[CS_LEFT],
+                         nodeMod->characteristicFormatTarget[CS_LEFT],
+                         nodeMod->pCCharTarget[CS_LEFT], gainDb, &gainDbMapped);
+          if (err) return err;
+          gainRatio_m = fDivNormSigned(
+              gainDbMapped, FX_SGL2FX_DBL(gainDb),
+              &gainRatio_e); /* target characteristic in payload */
+        }
+      }
+
+      else { /* if (((gainDb < (FIXP_SGL)0) && nodeMod->slopeIsNegative) ||
+                ((gainDb > (FIXP_SGL)0) && !nodeMod->slopeIsNegative)) */
+
+        /* right side */
+        if (pGMod->targetCharacteristicRightPresent == 1) {
+          err =
+              _mapGain(nodeMod->characteristicFormatSource[CS_RIGHT],
+                       nodeMod->pCCharSource[CS_RIGHT],
+                       nodeMod->characteristicFormatTarget[CS_RIGHT],
+                       nodeMod->pCCharTarget[CS_RIGHT], gainDb, &gainDbMapped);
+          if (err) return err;
+          gainRatio_m = fDivNormSigned(
+              gainDbMapped, FX_SGL2FX_DBL(gainDb),
+              &gainRatio_e); /* target characteristic in payload */
+        }
+      }
+    }
+    if (gainDb < (FIXP_SGL)0) {
+      gainRatio_m = fMultDiv2(gainRatio_m, nodeMod->compress);
+    } else {
+      gainRatio_m = fMultDiv2(gainRatio_m, nodeMod->boost);
+    }
+    gainRatio_e += 2;
+  }
+  if ((pGMod != NULL) && (pGMod->gainScalingPresent == 1)) {
+    if (gainDb < (FIXP_SGL)0) {
+      gainRatio_m = fMultDiv2(gainRatio_m, pGMod->attenuationScaling);
+    } else {
+      gainRatio_m = fMultDiv2(gainRatio_m, pGMod->amplificationScaling);
+    }
+    gainRatio_e += 3;
+  }
+  if ((pDMod != NULL) &&
+      (nodeMod->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) &&
+      (pDMod->duckingScalingPresent == 1)) {
+    gainRatio_m = fMultDiv2(gainRatio_m, pDMod->duckingScaling);
+    gainRatio_e += 3;
+  }
+
+  gainDb_modified =
+      fMultDiv2(gainDb, gainRatio_m); /* resulting e: 7 + gainRatio_e + 1*/
+  gainDb_offset = (FIXP_DBL)0;
+
+  if ((pGMod != NULL) && (pGMod->gainOffsetPresent == 1)) {
+    /* *gainLin *= (float)pow(2.0, (double)(pGMod->gainOffset/6.0f)); */
+    gainDb_offset += FX_SGL2FX_DBL(pGMod->gainOffset) >> 4; /* resulting e: 8 */
+  }
+  if ((nodeMod->limiterPeakTargetPresent == 1) &&
+      (nodeMod->drcSetEffect ==
+       EB_CLIPPING)) { /* The only drcSetEffect is "clipping prevention" */
+    /* loudnessNormalizationGainModificationDb is included in
+     * loudnessNormalizationGainDb */
+    /* *gainLin *= (float)pow(2.0, max(0.0, -nodeModification->limiterPeakTarget
+     * - nodeModification->loudnessNormalizationGainDb)/6.0); */
+    gainDb_offset += fMax(
+        (FIXP_DBL)0,
+        (FX_SGL2FX_DBL(-nodeMod->limiterPeakTarget) >> 3) -
+            (nodeMod->loudnessNormalizationGainDb >> 1)); /* resulting e: 8 */
+  }
+  if (gainDb_offset != (FIXP_DBL)0) {
+    gainDb_out = fAddNorm(gainDb_modified, 7 + gainRatio_e + 1, gainDb_offset,
+                          8, &gainDb_out_e);
+  } else {
+    gainDb_out = gainDb_modified;
+    gainDb_out_e = 7 + gainRatio_e + 1;
+  }
+
+  /* *gainLin = (float)pow(2.0, (double)(gainDb_modified[1] / 6.0f)); */
+  gainLin_m = approxDb2lin(gainDb_out, gainDb_out_e, &gainLin_e);
+  *gainLin = scaleValueSaturate(gainLin_m, gainLin_e - 7);
+
+  /* *slopeLin = SLOPE_FACTOR_DB_TO_LINEAR * gainRatio * *gainLin * slopeDb; */
+  if (slopeDb == (FIXP_SGL)0) {
+    *slopeLin = (FIXP_DBL)0;
+  } else {
+    tmp_dbl =
+        fMult(slopeDb, SLOPE_FACTOR_DB_TO_LINEAR); /* resulting e: 2 - 3 = -1 */
+    tmp_dbl = fMult(tmp_dbl, gainRatio_m); /* resulting e: -1 + gainRatio_e */
+    if (gainDb_offset !=
+        (FIXP_DBL)0) { /* recalculate gainLin from gainDb that wasn't modified
+                          by gainOffset and limiterPeakTarget */
+      gainLin_m = approxDb2lin(gainDb_modified, 7 + gainRatio_e, &gainLin_e);
+    }
+    slopeLin_m = fMult(tmp_dbl, gainLin_m);
+    *slopeLin =
+        scaleValueSaturate(slopeLin_m, -1 + gainRatio_e + gainLin_e - 7);
+  }
+
+  if ((nodeMod->limiterPeakTargetPresent == 1) &&
+      (nodeMod->drcSetEffect == EB_CLIPPING)) {
+    if (*gainLin >= FL2FXCONST_DBL(1.0f / (float)(1 << 7))) {
+      *gainLin = FL2FXCONST_DBL(1.0f / (float)(1 << 7));
+      *slopeLin = (FIXP_DBL)0;
+    }
+  }
+
+  return DE_OK;
+}
+
+/* prepare buffers containing linear nodes for each gain sequence */
+DRC_ERROR
+prepareDrcGain(HANDLE_DRC_GAIN_DECODER hGainDec,
+               HANDLE_UNI_DRC_GAIN hUniDrcGain, const FIXP_SGL compress,
+               const FIXP_SGL boost, const FIXP_DBL loudnessNormalizationGainDb,
+               const int activeDrcIndex) {
+  int b, g, gainElementIndex;
+  DRC_GAIN_BUFFERS* drcGainBuffers = &(hGainDec->drcGainBuffers);
+  NODE_MODIFICATION nodeMod;
+  FDKmemclear(&nodeMod, sizeof(NODE_MODIFICATION));
+  ACTIVE_DRC* pActiveDrc = &(hGainDec->activeDrc[activeDrcIndex]);
+  DRC_INSTRUCTIONS_UNI_DRC* pInst = pActiveDrc->pInst;
+  if (pInst == NULL) return DE_NOT_OK;
+
+  nodeMod.drcSetEffect = pInst->drcSetEffect;
+
+  nodeMod.compress = compress;
+  nodeMod.boost = boost;
+  nodeMod.loudnessNormalizationGainDb = loudnessNormalizationGainDb;
+  nodeMod.limiterPeakTargetPresent = pInst->limiterPeakTargetPresent;
+  nodeMod.limiterPeakTarget = pInst->limiterPeakTarget;
+
+  gainElementIndex = 0;
+  for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+    int gainSetIndex = 0;
+    int nDrcBands = 0;
+    DRC_COEFFICIENTS_UNI_DRC* pCoef = pActiveDrc->pCoef;
+    if (pCoef == NULL) return DE_NOT_OK;
+
+    if (!pActiveDrc->channelGroupIsParametricDrc[g]) {
+      gainSetIndex = pInst->gainSetIndexForChannelGroup[g];
+
+      if (nodeMod.drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) {
+        nodeMod.pDMod = &(pActiveDrc->duckingModificationForChannelGroup[g]);
+        nodeMod.pGMod = NULL;
+      } else {
+        nodeMod.pGMod = pInst->gainModificationForChannelGroup[g];
+        nodeMod.pDMod = NULL;
+      }
+
+      nDrcBands = pActiveDrc->bandCountForChannelGroup[g];
+      for (b = 0; b < nDrcBands; b++) {
+        DRC_ERROR err = DE_OK;
+        GAIN_SET* pGainSet = &(pCoef->gainSet[gainSetIndex]);
+        int seq = pGainSet->gainSequenceIndex[b];
+        DRC_CHARACTERISTIC* pDChar = &(pGainSet->drcCharacteristic[b]);
+
+        /* linearNodeBuffer contains a copy of the gain sequences (consisting of
+           nodes) that are relevant for decoding. It also contains gain
+           sequences of previous frames. */
+        LINEAR_NODE_BUFFER* pLnb =
+            &(drcGainBuffers->linearNodeBuffer[pActiveDrc->activeDrcOffset +
+                                               gainElementIndex]);
+        int i, lnbp;
+        lnbp = drcGainBuffers->lnbPointer;
+        pLnb->gainInterpolationType =
+            (GAIN_INTERPOLATION_TYPE)pGainSet->gainInterpolationType;
+
+        err = _prepareDrcCharacteristic(pDChar, pCoef, b, &nodeMod);
+        if (err) return err;
+
+        /* copy a node buffer and convert from dB to linear */
+        pLnb->nNodes[lnbp] = fMin((int)hUniDrcGain->nNodes[seq], 16);
+        for (i = 0; i < pLnb->nNodes[lnbp]; i++) {
+          FIXP_DBL gainLin, slopeLin;
+          err = _toLinear(&nodeMod, b, hUniDrcGain->gainNode[seq][i].gainDb,
+                          (FIXP_SGL)0, &gainLin, &slopeLin);
+          if (err) return err;
+          pLnb->linearNode[lnbp][i].gainLin = gainLin;
+          pLnb->linearNode[lnbp][i].time = hUniDrcGain->gainNode[seq][i].time;
+        }
+        gainElementIndex++;
+      }
+    } else {
+      /* parametric DRC not supported */
+      gainElementIndex++;
+    }
+  }
+  return DE_OK;
+}