Include patched FDK-AAC in the repository

The initial idea was to get the DAB+ patch into upstream, but since
that follows the android source releases, there is no place for a custom
DAB+ patch there.

So instead of having to maintain a patched fdk-aac that has to have the
same .so version as the distribution package on which it is installed,
we prefer having a separate fdk-aac-dab library to avoid collision.

At that point, there's no reason to keep fdk-aac in a separate
repository, as odr-audioenc is the only tool that needs DAB+ encoding
support. Including it here simplifies installation, and makes it
consistent with toolame-dab, also shipped in this repository.

DAB+ decoding support (needed by ODR-SourceCompanion, dablin, etisnoop,
welle.io and others) can be done using upstream FDK-AAC.

6 files changed, 1120 insertions, 0 deletions

diff --git a/fdk-aac/libFDK/include/arm/clz_arm.h b/fdk-aac/libFDK/include/arm/clz_arm.h
new file mode 100644
index 0000000..1c3e1fb
--- /dev/null
+++ b/fdk-aac/libFDK/include/arm/clz_arm.h
@@ -0,0 +1,164 @@
+/* -----------------------------------------------------------------------------
+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
+----------------------------------------------------------------------------- */
+
+/******************* Library for basic calculation routines ********************
+
+   Author(s):
+
+   Description: fixed point intrinsics
+
+*******************************************************************************/
+
+#if !defined(CLZ_ARM_H)
+#define CLZ_ARM_H
+
+#if defined(__arm__)
+
+#if defined(__GNUC__)
+/* ARM gcc*/
+
+#if defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_8__)
+#define FUNCTION_fixnormz_D
+#define FUNCTION_fixnorm_D
+#define FUNCTION_fixnormz_S
+#define FUNCTION_fixnorm_S
+
+#ifdef FUNCTION_fixnormz_D
+inline INT fixnormz_D(LONG value) {
+  INT result;
+#if defined(__ARM_ARCH_8__)
+  asm("clz %w0, %w1 " : "=r"(result) : "r"(value));
+#else
+  asm("clz %0, %1 " : "=r"(result) : "r"(value));
+#endif
+  return result;
+}
+#endif /* #ifdef FUNCTION_fixnormz_D */
+
+#ifdef FUNCTION_fixnorm_D
+inline INT fixnorm_D(LONG value) {
+  if (!value) return 0;
+  if (value < 0) value = ~value;
+  return fixnormz_D(value) - 1;
+}
+#endif /* #ifdef FUNCTION_fixnorm_D */
+
+#ifdef FUNCTION_fixnormz_S
+inline INT fixnormz_S(SHORT value) {
+  INT result;
+  result = (LONG)(value << 16);
+  if (result == 0)
+    result = 16;
+  else
+    result = fixnormz_D(result);
+  return result;
+}
+#endif /* #ifdef FUNCTION_fixnormz_S */
+
+#ifdef FUNCTION_fixnorm_S
+inline INT fixnorm_S(SHORT value) {
+  LONG lvalue = (LONG)(value << 16);
+  if (!lvalue) return 0;
+  if (lvalue < 0) lvalue = ~lvalue;
+  return fixnormz_D(lvalue) - 1;
+}
+#endif /* #ifdef FUNCTION_fixnorm_S */
+
+#endif
+
+#endif /* arm toolchain */
+
+#endif /* __arm__ */
+
+#endif /* !defined(CLZ_ARM_H) */
diff --git a/fdk-aac/libFDK/include/arm/cplx_mul_arm.h b/fdk-aac/libFDK/include/arm/cplx_mul_arm.h
new file mode 100644
index 0000000..a448e33
--- /dev/null
+++ b/fdk-aac/libFDK/include/arm/cplx_mul_arm.h
@@ -0,0 +1,201 @@
+/* -----------------------------------------------------------------------------
+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
+----------------------------------------------------------------------------- */
+
+/******************* Library for basic calculation routines ********************
+
+   Author(s):
+
+   Description: fixed point intrinsics
+
+*******************************************************************************/
+
+#if !defined(CPLX_MUL_ARM_H)
+#define CPLX_MUL_ARM_H
+
+#if defined(__arm__) && defined(__GNUC__)
+
+#if defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_6__) || \
+    defined(__ARM_ARCH_8__)
+#define FUNCTION_cplxMultDiv2_32x16
+#define FUNCTION_cplxMultDiv2_32x16X2
+#endif
+
+#define FUNCTION_cplxMultDiv2_32x32X2
+#ifdef FUNCTION_cplxMultDiv2_32x32X2
+inline void cplxMultDiv2(FIXP_DBL *c_Re, FIXP_DBL *c_Im, const FIXP_DBL a_Re,
+                         const FIXP_DBL a_Im, const FIXP_DBL b_Re,
+                         const FIXP_DBL b_Im) {
+  LONG tmp1, tmp2;
+
+#ifdef __ARM_ARCH_8__
+  asm("smull  %x0, %w2, %w4;       \n" /* tmp1  = a_Re * b_Re */
+      "smull  %x1, %w2, %w5;       \n" /* tmp2  = a_Re * b_Im */
+      "smsubl %x0, %w3, %w5, %x0;  \n" /* tmp1 -= a_Im * b_Im */
+      "smaddl %x1, %w3, %w4, %x1;  \n" /* tmp2 += a_Im * b_Re */
+      "asr    %x0, %x0,  #32       \n"
+      "asr    %x1, %x1,  #32       \n"
+      : "=&r"(tmp1), "=&r"(tmp2)
+      : "r"(a_Re), "r"(a_Im), "r"(b_Re), "r"(b_Im));
+#elif defined(__ARM_ARCH_6__)
+  asm("smmul %0, %2, %4;\n"     /* tmp1  = a_Re * b_Re */
+      "smmls %0, %3, %5, %0;\n" /* tmp1 -= a_Im * b_Im */
+      "smmul %1, %2, %5;\n"     /* tmp2  = a_Re * b_Im */
+      "smmla %1, %3, %4, %1;\n" /* tmp2 += a_Im * b_Re */
+      : "=&r"(tmp1), "=&r"(tmp2)
+      : "r"(a_Re), "r"(a_Im), "r"(b_Re), "r"(b_Im));
+#else
+  LONG discard;
+  asm("smull %2, %0, %7, %6;\n" /* tmp1  = -a_Im * b_Im */
+      "smlal %2, %0, %3, %5;\n" /* tmp1 +=  a_Re * b_Re */
+      "smull %2, %1, %3, %6;\n" /* tmp2  =  a_Re * b_Im */
+      "smlal %2, %1, %4, %5;\n" /* tmp2 +=  a_Im * b_Re */
+      : "=&r"(tmp1), "=&r"(tmp2), "=&r"(discard)
+      : "r"(a_Re), "r"(a_Im), "r"(b_Re), "r"(b_Im), "r"(-a_Im));
+#endif
+  *c_Re = tmp1;
+  *c_Im = tmp2;
+}
+#endif /* FUNCTION_cplxMultDiv2_32x32X2 */
+
+#if defined(FUNCTION_cplxMultDiv2_32x16)
+inline void cplxMultDiv2(FIXP_DBL *c_Re, FIXP_DBL *c_Im, const FIXP_DBL a_Re,
+                         const FIXP_DBL a_Im, FIXP_SPK wpk) {
+#ifdef __ARM_ARCH_8__
+  FIXP_DBL b_Im = FX_SGL2FX_DBL(wpk.v.im);
+  FIXP_DBL b_Re = FX_SGL2FX_DBL(wpk.v.re);
+  cplxMultDiv2(c_Re, c_Im, a_Re, a_Im, b_Re, b_Im);
+#else
+  LONG tmp1, tmp2;
+  const LONG w = wpk.w;
+  asm("smulwt %0, %3, %4;\n"
+      "rsb %1,%0,#0;\n"
+      "smlawb %0, %2, %4, %1;\n"
+      "smulwt %1, %2, %4;\n"
+      "smlawb %1, %3, %4, %1;\n"
+      : "=&r"(tmp1), "=&r"(tmp2)
+      : "r"(a_Re), "r"(a_Im), "r"(w));
+  *c_Re = tmp1;
+  *c_Im = tmp2;
+#endif
+}
+#endif /* FUNCTION_cplxMultDiv2_32x16 */
+
+#ifdef FUNCTION_cplxMultDiv2_32x16X2
+inline void cplxMultDiv2(FIXP_DBL *c_Re, FIXP_DBL *c_Im, const FIXP_DBL a_Re,
+                         const FIXP_DBL a_Im, const FIXP_SGL b_Re,
+                         const FIXP_SGL b_Im) {
+#ifdef __ARM_ARCH_8__
+  FIXP_DBL b_re = FX_SGL2FX_DBL(b_Re);
+  FIXP_DBL b_im = FX_SGL2FX_DBL(b_Im);
+  cplxMultDiv2(c_Re, c_Im, a_Re, a_Im, b_re, b_im);
+#else
+  LONG tmp1, tmp2;
+
+  asm("smulwb %0, %3, %5;\n" /* %7   = -a_Im * b_Im */
+      "rsb %1,%0,#0;\n"
+      "smlawb %0, %2, %4, %1;\n" /* tmp1 =  a_Re * b_Re - a_Im * b_Im */
+      "smulwb %1, %2, %5;\n"     /* %7   =  a_Re * b_Im */
+      "smlawb %1, %3, %4, %1;\n" /* tmp2 =  a_Im * b_Re + a_Re * b_Im */
+      : "=&r"(tmp1), "=&r"(tmp2)
+      : "r"(a_Re), "r"(a_Im), "r"(b_Re), "r"(b_Im));
+
+  *c_Re = tmp1;
+  *c_Im = tmp2;
+#endif
+}
+#endif /* FUNCTION_cplxMultDiv2_32x16X2 */
+
+#endif
+
+#endif /* !defined(CPLX_MUL_ARM_H) */
diff --git a/fdk-aac/libFDK/include/arm/fixmadd_arm.h b/fdk-aac/libFDK/include/arm/fixmadd_arm.h
new file mode 100644
index 0000000..1378660
--- /dev/null
+++ b/fdk-aac/libFDK/include/arm/fixmadd_arm.h
@@ -0,0 +1,220 @@
+/* -----------------------------------------------------------------------------
+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
+----------------------------------------------------------------------------- */
+
+/******************* Library for basic calculation routines ********************
+
+   Author(s):
+
+   Description: fixed point intrinsics
+
+*******************************************************************************/
+
+#if !defined(FIXMADD_ARM_H)
+#define FIXMADD_ARM_H
+
+#if defined(__arm__)
+
+/* #############################################################################
+ */
+#if defined(__GNUC__) && defined(__arm__)
+/* #############################################################################
+ */
+/* ARM GNU GCC */
+
+#ifdef __ARM_ARCH_8__
+#define FUNCTION_fixmadddiv2_DD
+#ifdef FUNCTION_fixmadddiv2_DD
+inline FIXP_DBL fixmadddiv2_DD(FIXP_DBL x, const FIXP_DBL a, const FIXP_DBL b) {
+  INT64 result;
+  asm("smull  %x0,  %w1,  %w2;    \n"
+      "asr    %x0,  %x0,  #32;    \n"
+      "add    %w0, %w3,  %w0;    \n"
+      : "=&r"(result)
+      : "r"(a), "r"(b), "r"(x));
+  return (INT)result;
+}
+#endif /* #ifdef FUNCTION_fixmadddiv2_DD */
+
+#define FUNCTION_fixmsubdiv2_DD
+#ifdef FUNCTION_fixmsubdiv2_DD
+inline FIXP_DBL fixmsubdiv2_DD(FIXP_DBL x, const FIXP_DBL a, const FIXP_DBL b) {
+  INT64 result;
+  asm("smull  %x0,  %w1, %w2;     \n"
+      "asr    %x0,  %x0,  #32;     \n"
+      "sub    %w0, %w3, %w0;     \n"
+      : "=&r"(result)
+      : "r"(a), "r"(b), "r"(x));
+  return (INT)result;
+}
+#endif /* #ifdef FUNCTION_fixmsubdiv2_DD */
+
+#elif defined(__ARM_ARCH_6__)
+#define FUNCTION_fixmadddiv2_DD
+#ifdef FUNCTION_fixmadddiv2_DD
+inline FIXP_DBL fixmadddiv2_DD(FIXP_DBL x, const FIXP_DBL a, const FIXP_DBL b) {
+  INT result;
+  asm("smmla %0, %1, %2, %3;\n" : "=r"(result) : "r"(a), "r"(b), "r"(x));
+  return result;
+}
+#endif /* #ifdef FUNCTION_fixmadddiv2_DD */
+
+#define FUNCTION_fixmsubdiv2_DD
+#ifdef FUNCTION_fixmsubdiv2_DD
+inline FIXP_DBL fixmsubdiv2_DD(FIXP_DBL x, const FIXP_DBL a, const FIXP_DBL b) {
+  INT result;
+  asm("smmls %0, %1, %2, %3;\n" : "=r"(result) : "r"(a), "r"(b), "r"(x));
+  return result;
+}
+#endif /* #ifdef FUNCTION_fixmsubdiv2_DD */
+
+#else
+#define FUNCTION_fixmadddiv2_DD
+#ifdef FUNCTION_fixmadddiv2_DD
+inline FIXP_DBL fixmadddiv2_DD(FIXP_DBL x, const FIXP_DBL a, const FIXP_DBL b) {
+  INT discard = 0;
+  INT result = x;
+  asm("smlal %0, %1, %2, %3;\n" : "+r"(discard), "+r"(result) : "r"(a), "r"(b));
+  return result;
+}
+#endif /* #ifdef FUNCTION_fixmadddiv2_DD */
+#endif
+
+#if defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_6__)
+
+#define FUNCTION_fixmadddiv2_DS
+#ifdef FUNCTION_fixmadddiv2_DS
+inline FIXP_DBL fixmadddiv2_DS(FIXP_DBL x, const FIXP_DBL a, const FIXP_SGL b) {
+  INT result;
+  asm("smlawb %0, %1, %2, %3 " : "=r"(result) : "r"(a), "r"(b), "r"(x));
+  return result;
+}
+#endif /* #ifdef FUNCTION_fixmadddiv2_DS */
+
+#endif /* defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_6__) */
+
+#define FUNCTION_fixmadddiv2BitExact_DD
+#ifdef FUNCTION_fixmadddiv2BitExact_DD
+#define fixmadddiv2BitExact_DD(a, b, c) fixmadddiv2_DD(a, b, c)
+#endif /* #ifdef FUNCTION_fixmadddiv2BitExact_DD */
+
+#define FUNCTION_fixmsubdiv2BitExact_DD
+#ifdef FUNCTION_fixmsubdiv2BitExact_DD
+inline FIXP_DBL fixmsubdiv2BitExact_DD(FIXP_DBL x, const FIXP_DBL a,
+                                       const FIXP_DBL b) {
+  return x - fixmuldiv2BitExact_DD(a, b);
+}
+#endif /* #ifdef FUNCTION_fixmsubdiv2BitExact_DD */
+
+#define FUNCTION_fixmadddiv2BitExact_DS
+#ifdef FUNCTION_fixmadddiv2BitExact_DS
+#define fixmadddiv2BitExact_DS(a, b, c) fixmadddiv2_DS(a, b, c)
+#endif /* #ifdef FUNCTION_fixmadddiv2BitExact_DS */
+
+#define FUNCTION_fixmsubdiv2BitExact_DS
+#ifdef FUNCTION_fixmsubdiv2BitExact_DS
+inline FIXP_DBL fixmsubdiv2BitExact_DS(FIXP_DBL x, const FIXP_DBL a,
+                                       const FIXP_SGL b) {
+  return x - fixmuldiv2BitExact_DS(a, b);
+}
+#endif /* #ifdef FUNCTION_fixmsubdiv2BitExact_DS */
+
+/* #############################################################################
+ */
+#endif /* toolchain */
+  /* #############################################################################
+   */
+
+#endif /* __arm__ */
+
+#endif /* !defined(FIXMADD_ARM_H) */
diff --git a/fdk-aac/libFDK/include/arm/fixmul_arm.h b/fdk-aac/libFDK/include/arm/fixmul_arm.h
new file mode 100644
index 0000000..077e5c6
--- /dev/null
+++ b/fdk-aac/libFDK/include/arm/fixmul_arm.h
@@ -0,0 +1,198 @@
+/* -----------------------------------------------------------------------------
+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
+----------------------------------------------------------------------------- */
+
+/******************* Library for basic calculation routines ********************
+
+   Author(s):
+
+   Description: fixed point intrinsics
+
+*******************************************************************************/
+
+#if !defined(FIXMUL_ARM_H)
+#define FIXMUL_ARM_H
+
+#if defined(__arm__)
+
+#if defined(__GNUC__) && defined(__arm__)
+/* ARM with GNU compiler */
+
+#define FUNCTION_fixmuldiv2_DD
+
+#define FUNCTION_fixmuldiv2BitExact_DD
+#ifdef FUNCTION_fixmuldiv2BitExact_DD
+#define fixmuldiv2BitExact_DD(a, b) fixmuldiv2_DD(a, b)
+#endif /* #ifdef FUNCTION_fixmuldiv2BitExact_DD */
+
+#define FUNCTION_fixmulBitExact_DD
+#ifdef FUNCTION_fixmulBitExact_DD
+#define fixmulBitExact_DD(a, b) (fixmuldiv2BitExact_DD(a, b) << 1)
+#endif /* #ifdef FUNCTION_fixmulBitExact_DD */
+
+#define FUNCTION_fixmuldiv2BitExact_DS
+#ifdef FUNCTION_fixmuldiv2BitExact_DS
+#define fixmuldiv2BitExact_DS(a, b) fixmuldiv2_DS(a, b)
+#endif /* #ifdef FUNCTION_fixmuldiv2BitExact_DS */
+
+#define FUNCTION_fixmulBitExact_DS
+#ifdef FUNCTION_fixmulBitExact_DS
+#define fixmulBitExact_DS(a, b) fixmul_DS(a, b)
+#endif /* #ifdef FUNCTION_fixmulBitExact_DS */
+
+#ifdef FUNCTION_fixmuldiv2_DD
+inline INT fixmuldiv2_DD(const INT a, const INT b) {
+  INT result;
+#if defined(__ARM_ARCH_8__)
+  INT64 result64;
+  __asm__(
+      "smull %x0, %w1, %w2;\n"
+      "asr %x0, %x0, #32;     "
+      : "=r"(result64)
+      : "r"(a), "r"(b));
+  result = (INT)result64;
+#elif defined(__ARM_ARCH_6__) || defined(__TARGET_ARCH_7E_M)
+  __asm__("smmul %0, %1, %2" : "=r"(result) : "r"(a), "r"(b));
+#else
+  INT discard;
+  __asm__("smull %0, %1, %2, %3"
+          : "=&r"(discard), "=r"(result)
+          : "r"(a), "r"(b));
+#endif
+  return result;
+}
+#endif /* #ifdef FUNCTION_fixmuldiv2_DD */
+
+#if defined(__ARM_ARCH_8__)
+#define FUNCTION_fixmuldiv2_SD
+#ifdef FUNCTION_fixmuldiv2_SD
+inline INT fixmuldiv2_SD(const SHORT a, const INT b) {
+  return fixmuldiv2_DD((INT)(a << 16), b);
+}
+#endif /* #ifdef FUNCTION_fixmuldiv2_SD */
+#elif defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_6__)
+#define FUNCTION_fixmuldiv2_SD
+#ifdef FUNCTION_fixmuldiv2_SD
+inline INT fixmuldiv2_SD(const SHORT a, const INT b) {
+  INT result;
+  __asm__("smulwb %0, %1, %2" : "=r"(result) : "r"(b), "r"(a));
+  return result;
+}
+#endif /* #ifdef FUNCTION_fixmuldiv2_SD */
+#endif
+
+#define FUNCTION_fixmul_DD
+#ifdef FUNCTION_fixmul_DD
+#if defined(__ARM_ARCH_8__)
+inline INT fixmul_DD(const INT a, const INT b) {
+  INT64 result64;
+
+  __asm__(
+      "smull %x0, %w1, %w2;\n"
+      "asr %x0, %x0, #31;     "
+      : "=r"(result64)
+      : "r"(a), "r"(b));
+  return (INT)result64;
+}
+#else
+inline INT fixmul_DD(const INT a, const INT b) {
+  return (fixmuldiv2_DD(a, b) << 1);
+}
+#endif /* __ARM_ARCH_8__ */
+#endif /* #ifdef FUNCTION_fixmul_DD */
+
+#endif /* defined(__GNUC__) && defined(__arm__) */
+
+#endif /* __arm__ */
+
+#endif /* !defined(FIXMUL_ARM_H) */
diff --git a/fdk-aac/libFDK/include/arm/scale_arm.h b/fdk-aac/libFDK/include/arm/scale_arm.h
new file mode 100644
index 0000000..0bf4f66
--- /dev/null
+++ b/fdk-aac/libFDK/include/arm/scale_arm.h
@@ -0,0 +1,163 @@
+/* -----------------------------------------------------------------------------
+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
+----------------------------------------------------------------------------- */
+
+/******************* Library for basic calculation routines ********************
+
+   Author(s):
+
+   Description: ARM scaling operations
+
+*******************************************************************************/
+
+#if !defined(SCALE_ARM_H)
+#define SCALE_ARM_H
+
+#if defined(__GNUC__) /* GCC Compiler */
+
+#if defined(__ARM_ARCH_6__)
+
+inline static INT shiftRightSat(INT src, int scale) {
+  INT result;
+  asm("ssat %0,%2,%0;\n"
+
+      : "=&r"(result)
+      : "r"(src >> scale), "M"(SAMPLE_BITS));
+
+  return result;
+}
+
+#define SATURATE_INT_PCM_RIGHT_SHIFT(src, scale) shiftRightSat(src, scale)
+
+inline static INT shiftLeftSat(INT src, int scale) {
+  INT result;
+  asm("ssat %0,%2,%0;\n"
+
+      : "=&r"(result)
+      : "r"(src << scale), "M"(SAMPLE_BITS));
+
+  return result;
+}
+
+#define SATURATE_INT_PCM_LEFT_SHIFT(src, scale) shiftLeftSat(src, scale)
+
+#endif /* __ARM_ARCH_6__ */
+
+#endif /* compiler selection */
+
+#define FUNCTION_scaleValueInPlace
+#ifdef FUNCTION_scaleValueInPlace
+inline void scaleValueInPlace(FIXP_DBL *value, /*!< Value */
+                              INT scalefactor  /*!< Scalefactor */
+) {
+  INT newscale;
+  if ((newscale = scalefactor) >= 0)
+    *value <<= newscale;
+  else
+    *value >>= -newscale;
+}
+#endif /* #ifdef FUNCTION_scaleValueInPlace */
+
+#define SATURATE_RIGHT_SHIFT(src, scale, dBits)                                \
+  ((((LONG)(src) ^ ((LONG)(src) >> (DFRACT_BITS - 1))) >> (scale)) >           \
+   (LONG)(((1U) << ((dBits)-1)) - 1))                                          \
+      ? ((LONG)(src) >> (DFRACT_BITS - 1)) ^ (LONG)(((1U) << ((dBits)-1)) - 1) \
+      : ((LONG)(src) >> (scale))
+
+#define SATURATE_LEFT_SHIFT(src, scale, dBits)                                 \
+  (((LONG)(src) ^ ((LONG)(src) >> (DFRACT_BITS - 1))) >                        \
+   ((LONG)(((1U) << ((dBits)-1)) - 1) >> (scale)))                             \
+      ? ((LONG)(src) >> (DFRACT_BITS - 1)) ^ (LONG)(((1U) << ((dBits)-1)) - 1) \
+      : ((LONG)(src) << (scale))
+
+#endif /* !defined(SCALE_ARM_H) */
diff --git a/fdk-aac/libFDK/include/arm/scramble_arm.h b/fdk-aac/libFDK/include/arm/scramble_arm.h
new file mode 100644
index 0000000..a7cfe65
--- /dev/null
+++ b/fdk-aac/libFDK/include/arm/scramble_arm.h
@@ -0,0 +1,174 @@
+/* -----------------------------------------------------------------------------
+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
+----------------------------------------------------------------------------- */
+
+/******************* Library for basic calculation routines ********************
+
+   Author(s):
+
+   Description: bitreversal of input data
+
+*******************************************************************************/
+
+#if !defined(SCRAMBLE_ARM_H)
+#define SCRAMBLE_ARM_H
+
+#if defined(FUNCTION_scramble)
+#if defined(__GNUC__)
+
+#define FUNCTION_scramble
+
+#if defined(__ARM_ARCH_5TE__)
+#define USE_LDRD_STRD /* LDRD requires 8 byte data alignment. */
+#endif
+
+inline void scramble(FIXP_DBL x[], INT n) {
+  FDK_ASSERT(!(((INT)x) & (ALIGNMENT_DEFAULT - 1)));
+  asm("mov     r2, #1;\n"     /* r2(m) = 1;           */
+      "sub     r3, %1, #1;\n" /* r3 = n-1;            */
+      "mov     r4, #0;\n"     /* r4(j) = 0;           */
+
+      "scramble_m_loop%=:\n" /* {                    */
+      "mov     r5, %1;\n"    /*  r5(k) = 1;          */
+
+      "scramble_k_loop%=:\n"         /*  {                   */
+      "mov     r5, r5, lsr #1;\n"    /*   k >>= 1;           */
+      "eor     r4, r4, r5;\n"        /*   j ^=k;             */
+      "ands    r10, r4, r5;\n"       /*   r10 = r4 & r5;      */
+      "beq     scramble_k_loop%=;\n" /*  } while (r10 == 0);  */
+
+      "cmp     r4, r2;\n" /*   if (r4 < r2) break;        */
+      "bcc     scramble_m_loop_end%=;\n"
+
+#ifdef USE_LDRD_STRD
+      "mov     r5, r2, lsl #3;\n" /* m(r5) = r2*4*2               */
+      "ldrd    r10, [%0, r5];\n"  /* r10 = x[r5], x7 = x[r5+1]     */
+      "mov     r6, r4, lsl #3;\n" /* j(r6) = r4*4*2              */
+      "ldrd    r8, [%0, r6];\n"   /* r8 = x[r6], r9 = x[r6+1];  */
+      "strd    r10, [%0, r6];\n"  /* x[r6,r6+1] = r10,r11;        */
+      "strd    r8, [%0, r5];\n"   /* x[r5,r5+1] = r8,r9;          */
+#else
+      "mov      r5, r2, lsl #3;\n" /* m(r5) = r2*4*2               */
+      "ldr      r10, [%0, r5];\n"
+      "mov      r6, r4, lsl #3;\n" /* j(r6) = r4*4*2              */
+      "ldr      r11, [%0, r6];\n"
+
+      "str      r10, [%0, r6];\n"
+      "str      r11, [%0, r5];\n"
+
+      "add      r5, r5, #4;"
+      "ldr      r10, [%0, r5];\n"
+      "add      r6, r6, #4;"
+      "ldr      r11, [%0, r6];\n"
+      "str      r10, [%0, r6];\n"
+      "str      r11, [%0, r5];\n"
+#endif
+      "scramble_m_loop_end%=:\n"
+      "add     r2, r2, #1;\n" /* r2++;                        */
+      "cmp     r2, r3;\n"
+      "bcc     scramble_m_loop%=;\n" /* } while (r2(m) < r3(n-1));   */
+      :
+      : "r"(x), "r"(n)
+#ifdef USE_LDRD_STRD
+      : "r2", "r3", "r4", "r5", "r10", "r11", "r8", "r9", "r6");
+#else
+      : "r2", "r3", "r4", "r5", "r10", "r11", "r6");
+#endif
+}
+#else
+/* Force C implementation if no assembler version available. */
+#undef FUNCTION_scramble
+#endif /* Toolchain selection. */
+
+#endif /* defined(FUNCTION_scramble) */
+#endif /* !defined(SCRAMBLE_ARM_H) */