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, 371 insertions, 0 deletions

diff --git a/libDRCdec/src/drcDec_tools.cpp b/libDRCdec/src/drcDec_tools.cpp
new file mode 100644
index 0000000..9a6feb1
--- /dev/null
+++ b/libDRCdec/src/drcDec_tools.cpp
@@ -0,0 +1,371 @@
+/* -----------------------------------------------------------------------------
+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_tools.h"
+#include "fixpoint_math.h"
+#include "drcDecoder.h"
+
+int getDeltaTmin(const int sampleRate) {
+  /* half_ms = round (0.0005 * sampleRate); */
+  int half_ms = (sampleRate + 1000) / 2000;
+  int deltaTmin = 1;
+  if (sampleRate < 1000) {
+    return DE_NOT_OK;
+  }
+  while (deltaTmin <= half_ms) {
+    deltaTmin = deltaTmin << 1;
+  }
+  return deltaTmin;
+}
+
+DRC_COEFFICIENTS_UNI_DRC* selectDrcCoefficients(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int location) {
+  int n;
+  int c = -1;
+  for (n = 0; n < hUniDrcConfig->drcCoefficientsUniDrcCount; n++) {
+    if (hUniDrcConfig->drcCoefficientsUniDrc[n].drcLocation == location) {
+      c = n;
+    }
+  }
+  if (c >= 0) {
+    return &(hUniDrcConfig->drcCoefficientsUniDrc[c]);
+  }
+  return NULL; /* possible during bitstream parsing */
+}
+
+DRC_INSTRUCTIONS_UNI_DRC* selectDrcInstructions(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int drcSetId) {
+  int i;
+  for (i = 0; i < hUniDrcConfig->drcInstructionsCountInclVirtual; i++) {
+    if (hUniDrcConfig->drcInstructionsUniDrc[i].drcSetId == drcSetId) {
+      return &(hUniDrcConfig->drcInstructionsUniDrc[i]);
+    }
+  }
+  return NULL;
+}
+
+DOWNMIX_INSTRUCTIONS* selectDownmixInstructions(
+    HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int downmixId) {
+  int i;
+  for (i = 0; i < hUniDrcConfig->downmixInstructionsCount; i++) {
+    if (hUniDrcConfig->downmixInstructions[i].downmixId == downmixId) {
+      return &(hUniDrcConfig->downmixInstructions[i]);
+    }
+  }
+  return NULL;
+}
+
+DRC_ERROR
+deriveDrcChannelGroups(
+    const int drcSetEffect,                                    /* in */
+    const int channelCount,                                    /* in */
+    const SCHAR* gainSetIndex,                                 /* in */
+    const DUCKING_MODIFICATION* duckingModificationForChannel, /* in */
+    UCHAR* nDrcChannelGroups,                                  /* out */
+    SCHAR* uniqueIndex,     /* out (gainSetIndexForChannelGroup) */
+    SCHAR* groupForChannel, /* out */
+    DUCKING_MODIFICATION* duckingModificationForChannelGroup) /* out */
+{
+  int duckingSequence = -1;
+  int c, n, g, match, idx;
+  FIXP_SGL factor;
+  FIXP_SGL uniqueScaling[8];
+
+  for (g = 0; g < 8; g++) {
+    uniqueIndex[g] = -10;
+    uniqueScaling[g] = FIXP_SGL(-1.0f);
+  }
+
+  g = 0;
+
+  if (drcSetEffect & EB_DUCK_OTHER) {
+    for (c = 0; c < channelCount; c++) {
+      match = 0;
+      if (c >= 8) return DE_MEMORY_ERROR;
+      idx = gainSetIndex[c];
+      factor = duckingModificationForChannel[c].duckingScaling;
+      if (idx < 0) {
+        for (n = 0; n < g; n++) {
+          if (uniqueScaling[n] == factor) {
+            match = 1;
+            groupForChannel[c] = n;
+            break;
+          }
+        }
+        if (match == 0) {
+          if (g >= 8) return DE_MEMORY_ERROR;
+          uniqueIndex[g] = idx;
+          uniqueScaling[g] = factor;
+          groupForChannel[c] = g;
+          g++;
+        }
+      } else {
+        if ((duckingSequence > 0) && (duckingSequence != idx)) {
+          return DE_NOT_OK;
+        }
+        duckingSequence = idx;
+        groupForChannel[c] = -1;
+      }
+    }
+    if (duckingSequence == -1) {
+      return DE_NOT_OK;
+    }
+  } else if (drcSetEffect & EB_DUCK_SELF) {
+    for (c = 0; c < channelCount; c++) {
+      match = 0;
+      if (c >= 8) return DE_MEMORY_ERROR;
+      idx = gainSetIndex[c];
+      factor = duckingModificationForChannel[c].duckingScaling;
+      if (idx >= 0) {
+        for (n = 0; n < g; n++) {
+          if ((uniqueIndex[n] == idx) && (uniqueScaling[n] == factor)) {
+            match = 1;
+            groupForChannel[c] = n;
+            break;
+          }
+        }
+        if (match == 0) {
+          if (g >= 8) return DE_MEMORY_ERROR;
+          uniqueIndex[g] = idx;
+          uniqueScaling[g] = factor;
+          groupForChannel[c] = g;
+          g++;
+        }
+      } else {
+        groupForChannel[c] = -1;
+      }
+    }
+  } else { /* no ducking */
+    for (c = 0; c < channelCount; c++) {
+      if (c >= 8) return DE_MEMORY_ERROR;
+      idx = gainSetIndex[c];
+      match = 0;
+      if (idx >= 0) {
+        for (n = 0; n < g; n++) {
+          if (uniqueIndex[n] == idx) {
+            match = 1;
+            groupForChannel[c] = n;
+            break;
+          }
+        }
+        if (match == 0) {
+          if (g >= 8) return DE_MEMORY_ERROR;
+          uniqueIndex[g] = idx;
+          groupForChannel[c] = g;
+          g++;
+        }
+      } else {
+        groupForChannel[c] = -1;
+      }
+    }
+  }
+  *nDrcChannelGroups = g;
+
+  if (drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) {
+    for (g = 0; g < *nDrcChannelGroups; g++) {
+      if (drcSetEffect & EB_DUCK_OTHER) {
+        uniqueIndex[g] = duckingSequence;
+      }
+      duckingModificationForChannelGroup[g].duckingScaling = uniqueScaling[g];
+      if (uniqueScaling[g] != FL2FXCONST_SGL(1.0f / (float)(1 << 2))) {
+        duckingModificationForChannelGroup[g].duckingScalingPresent = 1;
+      } else {
+        duckingModificationForChannelGroup[g].duckingScalingPresent = 0;
+      }
+    }
+  }
+
+  return DE_OK;
+}
+
+FIXP_DBL
+dB2lin(const FIXP_DBL dB_m, const int dB_e, int* pLin_e) {
+  /* get linear value from dB.
+     return lin_val = 10^(dB_val/20) = 2^(log2(10)/20*dB_val)
+     with dB_val = dB_m *2^dB_e and lin_val = lin_m * 2^lin_e */
+  FIXP_DBL lin_m =
+      f2Pow(fMult(dB_m, FL2FXCONST_DBL(0.1660964f * (float)(1 << 2))), dB_e - 2,
+            pLin_e);
+
+  return lin_m;
+}
+
+FIXP_DBL
+lin2dB(const FIXP_DBL lin_m, const int lin_e, int* pDb_e) {
+  /* get dB value from linear value.
+     return dB_val = 20*log10(lin_val)
+     with dB_val = dB_m *2^dB_e and lin_val = lin_m * 2^lin_e */
+  FIXP_DBL dB_m;
+
+  if (lin_m == (FIXP_DBL)0) { /* return very small value representing -inf */
+    dB_m = (FIXP_DBL)MINVAL_DBL;
+    *pDb_e = DFRACT_BITS - 1;
+  } else {
+    /* 20*log10(lin_val) = 20/log2(10)*log2(lin_val) */
+    dB_m = fMultDiv2(FL2FXCONST_DBL(6.02059991f / (float)(1 << 3)),
+                     fLog2(lin_m, lin_e, pDb_e));
+    *pDb_e += 3 + 1;
+  }
+
+  return dB_m;
+}
+
+FIXP_DBL
+approxDb2lin(const FIXP_DBL dB_m, const int dB_e, int* pLin_e) {
+  /* get linear value from approximate dB.
+     return lin_val = 2^(dB_val/6)
+     with dB_val = dB_m *2^dB_e and lin_val = lin_m * 2^lin_e */
+  FIXP_DBL lin_m =
+      f2Pow(fMult(dB_m, FL2FXCONST_DBL(0.1666667f * (float)(1 << 2))), dB_e - 2,
+            pLin_e);
+
+  return lin_m;
+}
+
+int bitstreamContainsMultibandDrc(HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
+                                  const int downmixId) {
+  int i, g, d, seq;
+  DRC_INSTRUCTIONS_UNI_DRC* pInst;
+  DRC_COEFFICIENTS_UNI_DRC* pCoef = NULL;
+  int isMultiband = 0;
+
+  pCoef = selectDrcCoefficients(hUniDrcConfig, LOCATION_SELECTED);
+  if (pCoef == NULL) return 0;
+
+  for (i = 0; i < hUniDrcConfig->drcInstructionsUniDrcCount; i++) {
+    pInst = &(hUniDrcConfig->drcInstructionsUniDrc[i]);
+    for (d = 0; d < pInst->downmixIdCount; d++) {
+      if (downmixId == pInst->downmixId[d]) {
+        for (g = 0; g < pInst->nDrcChannelGroups; g++) {
+          seq = pInst->gainSetIndexForChannelGroup[g];
+          if (pCoef->gainSet[seq].bandCount > 1) {
+            isMultiband = 1;
+          }
+        }
+      }
+    }
+  }
+
+  return isMultiband;
+}
+
+FIXP_DBL getDownmixOffset(DOWNMIX_INSTRUCTIONS* pDown, int baseChannelCount) {
+  FIXP_DBL downmixOffset = FL2FXCONST_DBL(1.0f / (1 << 1)); /* e = 1 */
+  if ((pDown->bsDownmixOffset == 1) || (pDown->bsDownmixOffset == 2)) {
+    int e_a, e_downmixOffset;
+    FIXP_DBL a, q;
+    if (baseChannelCount <= pDown->targetChannelCount) return downmixOffset;
+
+    q = fDivNorm((FIXP_DBL)pDown->targetChannelCount,
+                 (FIXP_DBL)baseChannelCount); /* e = 0 */
+    a = lin2dB(q, 0, &e_a);
+    if (pDown->bsDownmixOffset == 2) {
+      e_a += 1; /* a *= 2 */
+    }
+    /* a = 0.5 * round (a) */
+    a = fixp_round(a, e_a) >> 1;
+    downmixOffset = dB2lin(a, e_a, &e_downmixOffset);
+    downmixOffset = scaleValue(downmixOffset, e_downmixOffset - 1);
+  }
+  return downmixOffset;
+}