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, 193 insertions, 183 deletions

diff --git a/libFDK/include/fft.h b/libFDK/include/fft.h
index 616f350..3576ed3 100644
--- a/libFDK/include/fft.h
+++ b/libFDK/include/fft.h
@@ -1,74 +1,85 @@
-
-/* -----------------------------------------------------------------------------------------------------------
+/* -----------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
-  All rights reserved.
+© 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.
+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:
+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 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
+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.
+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.
+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."
+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.
+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.
+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.
+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
 
@@ -79,17 +90,18 @@ Am Wolfsmantel 33
 
 www.iis.fraunhofer.de/amm
 amm-info@iis.fraunhofer.de
------------------------------------------------------------------------------------------------------------ */
+----------------------------------------------------------------------------- */
 
-/***************************  Fraunhofer IIS FDK Tools  **********************
+/******************* Library for basic calculation routines ********************
 
    Author(s):   Josef Hoepfl, DSP Solutions
+
    Description: Fix point FFT
 
-******************************************************************************/
+*******************************************************************************/
 
-#ifndef __FFT_H__
-#define __FFT_H__
+#ifndef FFT_H
+#define FFT_H
 
 #include "common_fix.h"
 
@@ -97,10 +109,10 @@ amm-info@iis.fraunhofer.de
  * \brief Perform an inplace complex valued FFT of length 2^n
  *
  * \param length Length of the FFT to be calculated.
- * \param pInput Input/Output data buffer. The input data must have at least 1 bit scale headroom.
- *          The values are interleaved, real/imag pairs.
- * \param scalefactor Pointer to an INT, which contains the current scale of the input data,
- *                    which is updated according to the FFT scale.
+ * \param pInput Input/Output data buffer. The input data must have at least 1
+ * bit scale headroom. The values are interleaved, real/imag pairs.
+ * \param scalefactor Pointer to an INT, which contains the current scale of the
+ * input data, which is updated according to the FFT scale.
  */
 void fft(int length, FIXP_DBL *pInput, INT *scalefactor);
 
@@ -108,146 +120,144 @@ void fft(int length, FIXP_DBL *pInput, INT *scalefactor);
  * \brief Perform an inplace complex valued IFFT of length 2^n
  *
  * \param length Length of the FFT to be calculated.
- * \param pInput Input/Output data buffer. The input data must have at least 1 bit scale headroom.
- *          The values are interleaved, real/imag pairs.
- * \param scalefactor Pointer to an INT, which contains the current scale of the input data,
- *                    which is updated according to the IFFT scale.
+ * \param pInput Input/Output data buffer. The input data must have at least 1
+ * bit scale headroom. The values are interleaved, real/imag pairs.
+ * \param scalefactor Pointer to an INT, which contains the current scale of the
+ * input data, which is updated according to the IFFT scale.
  */
 void ifft(int length, FIXP_DBL *pInput, INT *scalefactor);
 
-
 /*
  * Frequently used and fixed short length FFTs.
  */
 
+#ifndef FUNCTION_fft_4
+/**
+ * \brief Perform an inplace complex valued FFT of length 4
+ *
+ * \param pInput Input/Output data buffer. The input data must have at least 1
+ * bit scale headroom. The values are interleaved, real/imag pairs.
+ */
 LNK_SECTION_CODE_L1
-static void FORCEINLINE fft_4(FIXP_DBL *x)
-{
-    FIXP_DBL a00, a10, a20, a30, tmp0, tmp1;
+static void FDK_FORCEINLINE fft_4(FIXP_DBL *x) {
+  FIXP_DBL a00, a10, a20, a30, tmp0, tmp1;
 
-    a00 = (x[0] + x[4])>>1;  /* Re A + Re B */
-    a10 = (x[2] + x[6])>>1;  /* Re C + Re D */
-    a20 = (x[1] + x[5])>>1;  /* Im A + Im B */
-    a30 = (x[3] + x[7])>>1;  /* Im C + Im D */
+  a00 = (x[0] + x[4]) >> 1; /* Re A + Re B */
+  a10 = (x[2] + x[6]) >> 1; /* Re C + Re D */
+  a20 = (x[1] + x[5]) >> 1; /* Im A + Im B */
+  a30 = (x[3] + x[7]) >> 1; /* Im C + Im D */
 
-    x[0] = a00 + a10;       /* Re A' = Re A + Re B + Re C + Re D */
-    x[1] = a20 + a30;       /* Im A' = Im A + Im B + Im C + Im D */
+  x[0] = a00 + a10; /* Re A' = Re A + Re B + Re C + Re D */
+  x[1] = a20 + a30; /* Im A' = Im A + Im B + Im C + Im D */
 
-    tmp0 = a00 - x[4];       /* Re A - Re B */
-    tmp1 = a20 - x[5];       /* Im A - Im B */
+  tmp0 = a00 - x[4]; /* Re A - Re B */
+  tmp1 = a20 - x[5]; /* Im A - Im B */
 
-    x[4] = a00 - a10;       /* Re C' = Re A + Re B - Re C - Re D */
-    x[5] = a20 - a30;       /* Im C' = Im A + Im B - Im C - Im D */
+  x[4] = a00 - a10; /* Re C' = Re A + Re B - Re C - Re D */
+  x[5] = a20 - a30; /* Im C' = Im A + Im B - Im C - Im D */
 
-    a10 = a10 - x[6];       /* Re C - Re D */
-    a30 = a30 - x[7];       /* Im C - Im D */
+  a10 = a10 - x[6]; /* Re C - Re D */
+  a30 = a30 - x[7]; /* Im C - Im D */
 
-    x[2] = tmp0 + a30;       /* Re B' = Re A - Re B + Im C - Im D */
-    x[6] = tmp0 - a30;       /* Re D' = Re A - Re B - Im C + Im D */
-    x[3] = tmp1 - a10;       /* Im B' = Im A - Im B - Re C + Re D */
-    x[7] = tmp1 + a10;       /* Im D' = Im A - Im B + Re C - Re D */
+  x[2] = tmp0 + a30; /* Re B' = Re A - Re B + Im C - Im D */
+  x[6] = tmp0 - a30; /* Re D' = Re A - Re B - Im C + Im D */
+  x[3] = tmp1 - a10; /* Im B' = Im A - Im B - Re C + Re D */
+  x[7] = tmp1 + a10; /* Im D' = Im A - Im B + Re C - Re D */
 }
+#endif /* FUNCTION_fft_4 */
 
+#ifndef FUNCTION_fft_8
 LNK_SECTION_CODE_L1
-static void FORCEINLINE fft_8(FIXP_DBL *x)
-{
-      #define W_PiFOURTH STC(0x5a82799a)
-
-      FIXP_DBL a00, a10, a20, a30;
-      FIXP_DBL y[16];
-
-      a00 = (x[0] + x[8])>>1;
-      a10 =  x[4] + x[12];
-      a20 = (x[1] + x[9])>>1;
-      a30 =  x[5] + x[13];
-
-      y[0] = a00 + (a10>>1);
-      y[4] = a00 - (a10>>1);
-      y[1] = a20 + (a30>>1);
-      y[5] = a20 - (a30>>1);
-
-      a00 = a00      - x[8];
-      a10 = (a10>>1) - x[12];
-      a20 = a20      - x[9];
-      a30 = (a30>>1) - x[13];
-
-      y[2] = a00 + a30;
-      y[6] = a00 - a30;
-      y[3] = a20 - a10;
-      y[7] = a20 + a10;
-
-      a00 = (x[2] + x[10])>>1;
-      a10 =  x[6] + x[14];
-      a20 = (x[3] + x[11])>>1;
-      a30 =  x[7] + x[15];
-
-      y[8]  = a00 + (a10>>1);
-      y[12] = a00 - (a10>>1);
-      y[9]  = a20 + (a30>>1);
-      y[13] = a20 - (a30>>1);
-
-      a00 = a00      - x[10];
-      a10 = (a10>>1) - x[14];
-      a20 = a20      - x[11];
-      a30 = (a30>>1) - x[15];
-
-      y[10] = a00 + a30;
-      y[14] = a00 - a30;
-      y[11] = a20 - a10;
-      y[15] = a20 + a10;
-
-      FIXP_DBL vr, vi, ur, ui;
-
-      ur = y[0]>>1;
-      ui = y[1]>>1;
-      vr = y[8];
-      vi = y[9];
-      x[0] = ur + (vr>>1);
-      x[1] = ui + (vi>>1);
-      x[8] = ur - (vr>>1);
-      x[9] = ui - (vi>>1);
-
-      ur = y[4]>>1;
-      ui = y[5]>>1;
-      vi = y[12];
-      vr = y[13];
-      x[4]  = ur + (vr>>1);
-      x[5]  = ui - (vi>>1);
-      x[12] = ur - (vr>>1);
-      x[13] = ui + (vi>>1);
-
-      ur = y[10];
-      ui = y[11];
-      vr = fMultDiv2(ui+ur,W_PiFOURTH);
-      vi = fMultDiv2(ui-ur,W_PiFOURTH);
-      ur = y[2];
-      ui = y[3];
-      x[2]  = (ur>>1) + vr;
-      x[3]  = (ui>>1) + vi;
-      x[10] = (ur>>1) - vr;
-      x[11] = (ui>>1) - vi;
-
-      ur = y[14];
-      ui = y[15];
-      vr = fMultDiv2(ui-ur,W_PiFOURTH);
-      vi = fMultDiv2(ui+ur,W_PiFOURTH);
-      ur = y[6];
-      ui = y[7];
-      x[6]  = (ur>>1) + vr;
-      x[7]  = (ui>>1) - vi;
-      x[14] = (ur>>1) - vr;
-      x[15] = (ui>>1) + vi;
+static void FDK_FORCEINLINE fft_8(FIXP_DBL *x) {
+  FIXP_SPK w_PiFOURTH = {{FIXP_SGL(0x5A82), FIXP_SGL(0x5A82)}};
+
+  FIXP_DBL a00, a10, a20, a30;
+  FIXP_DBL y[16];
+
+  a00 = (x[0] + x[8]) >> 1;
+  a10 = x[4] + x[12];
+  a20 = (x[1] + x[9]) >> 1;
+  a30 = x[5] + x[13];
+
+  y[0] = a00 + (a10 >> 1);
+  y[4] = a00 - (a10 >> 1);
+  y[1] = a20 + (a30 >> 1);
+  y[5] = a20 - (a30 >> 1);
+
+  a00 = a00 - x[8];
+  a10 = (a10 >> 1) - x[12];
+  a20 = a20 - x[9];
+  a30 = (a30 >> 1) - x[13];
+
+  y[2] = a00 + a30;
+  y[6] = a00 - a30;
+  y[3] = a20 - a10;
+  y[7] = a20 + a10;
+
+  a00 = (x[2] + x[10]) >> 1;
+  a10 = x[6] + x[14];
+  a20 = (x[3] + x[11]) >> 1;
+  a30 = x[7] + x[15];
+
+  y[8] = a00 + (a10 >> 1);
+  y[12] = a00 - (a10 >> 1);
+  y[9] = a20 + (a30 >> 1);
+  y[13] = a20 - (a30 >> 1);
+
+  a00 = a00 - x[10];
+  a10 = (a10 >> 1) - x[14];
+  a20 = a20 - x[11];
+  a30 = (a30 >> 1) - x[15];
+
+  y[10] = a00 + a30;
+  y[14] = a00 - a30;
+  y[11] = a20 - a10;
+  y[15] = a20 + a10;
+
+  FIXP_DBL vr, vi, ur, ui;
+
+  ur = y[0] >> 1;
+  ui = y[1] >> 1;
+  vr = y[8];
+  vi = y[9];
+  x[0] = ur + (vr >> 1);
+  x[1] = ui + (vi >> 1);
+  x[8] = ur - (vr >> 1);
+  x[9] = ui - (vi >> 1);
+
+  ur = y[4] >> 1;
+  ui = y[5] >> 1;
+  vi = y[12];
+  vr = y[13];
+  x[4] = ur + (vr >> 1);
+  x[5] = ui - (vi >> 1);
+  x[12] = ur - (vr >> 1);
+  x[13] = ui + (vi >> 1);
+
+  ur = y[10];
+  ui = y[11];
+
+  cplxMultDiv2(&vi, &vr, ui, ur, w_PiFOURTH);
+
+  ur = y[2];
+  ui = y[3];
+  x[2] = (ur >> 1) + vr;
+  x[3] = (ui >> 1) + vi;
+  x[10] = (ur >> 1) - vr;
+  x[11] = (ui >> 1) - vi;
+
+  ur = y[14];
+  ui = y[15];
+
+  cplxMultDiv2(&vr, &vi, ui, ur, w_PiFOURTH);
+
+  ur = y[6];
+  ui = y[7];
+  x[6] = (ur >> 1) + vr;
+  x[7] = (ui >> 1) - vi;
+  x[14] = (ur >> 1) - vr;
+  x[15] = (ui >> 1) + vi;
 }
-
-/**
- * \brief FFT of fixed length 16
- */
-inline void fft_16(FIXP_DBL *x);
-
-/**
- * \brief FFT of fixed length 32
- */
-inline void fft_32(FIXP_DBL *x);
-
+#endif /* FUNCTION_fft_8 */
 
 #endif