libFDK/src/scale.cpp - third_party/android/platform/external/aac - Git at Google

 /* -----------------------------------------------------------------------------
 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: Scaling operations

 *******************************************************************************/

 #include "common_fix.h"

 #include "genericStds.h"

 /**************************************************
  * Inline definitions
  **************************************************/

 #include "scale.h"

 #if defined(__mips__)
 #include "mips/scale_mips.cpp"

 #elif defined(__arm__)
 #include "arm/scale_arm.cpp"

 #endif

 #ifndef FUNCTION_scaleValues_SGL
 /*!
  *
  *  \brief  Multiply input vector by \f$ 2^{scalefactor} \f$
  *  \param len    must be larger than 4
  *  \return void
  *
  */
 #define FUNCTION_scaleValues_SGL
 void scaleValues(FIXP_SGL *vector, /*!< Vector */
                  INT len,          /*!< Length */
                  INT scalefactor   /*!< Scalefactor */
 ) {
   INT i;

   /* Return if scalefactor is Zero */
   if (scalefactor == 0) return;

   if (scalefactor > 0) {
     scalefactor = fixmin_I(scalefactor, (INT)(FRACT_BITS - 1));
     for (i = len & 3; i--;) {
       *(vector++) <<= scalefactor;
     }
     for (i = len >> 2; i--;) {
       *(vector++) <<= scalefactor;
       *(vector++) <<= scalefactor;
       *(vector++) <<= scalefactor;
       *(vector++) <<= scalefactor;
     }
   } else {
     INT negScalefactor = fixmin_I(-scalefactor, (INT)FRACT_BITS - 1);
     for (i = len & 3; i--;) {
       *(vector++) >>= negScalefactor;
     }
     for (i = len >> 2; i--;) {
       *(vector++) >>= negScalefactor;
       *(vector++) >>= negScalefactor;
       *(vector++) >>= negScalefactor;
       *(vector++) >>= negScalefactor;
     }
   }
 }
 #endif

 #ifndef FUNCTION_scaleValues_DBL
 /*!
  *
  *  \brief  Multiply input vector by \f$ 2^{scalefactor} \f$
  *  \param len must be larger than 4
  *  \return void
  *
  */
 #define FUNCTION_scaleValues_DBL
 SCALE_INLINE
 void scaleValues(FIXP_DBL *vector, /*!< Vector */
                  INT len,          /*!< Length */
                  INT scalefactor   /*!< Scalefactor */
 ) {
   INT i;

   /* Return if scalefactor is Zero */
   if (scalefactor == 0) return;

   if (scalefactor > 0) {
     scalefactor = fixmin_I(scalefactor, (INT)DFRACT_BITS - 1);
     for (i = len & 3; i--;) {
       *(vector++) <<= scalefactor;
     }
     for (i = len >> 2; i--;) {
       *(vector++) <<= scalefactor;
       *(vector++) <<= scalefactor;
       *(vector++) <<= scalefactor;
       *(vector++) <<= scalefactor;
     }
   } else {
     INT negScalefactor = fixmin_I(-scalefactor, (INT)DFRACT_BITS - 1);
     for (i = len & 3; i--;) {
       *(vector++) >>= negScalefactor;
     }
     for (i = len >> 2; i--;) {
       *(vector++) >>= negScalefactor;
       *(vector++) >>= negScalefactor;
       *(vector++) >>= negScalefactor;
       *(vector++) >>= negScalefactor;
     }
   }
 }
 #endif

 #ifndef FUNCTION_scaleValuesSaturate_DBL
 /*!
  *
  *  \brief  Multiply input vector by \f$ 2^{scalefactor} \f$
  *  \param vector      source/destination buffer
  *  \param len         length of vector
  *  \param scalefactor amount of shifts to be applied
  *  \return void
  *
  */
 #define FUNCTION_scaleValuesSaturate_DBL
 SCALE_INLINE
 void scaleValuesSaturate(FIXP_DBL *vector, /*!< Vector */
                          INT len,          /*!< Length */
                          INT scalefactor   /*!< Scalefactor */
 ) {
   INT i;

   /* Return if scalefactor is Zero */
   if (scalefactor == 0) return;

   scalefactor = fixmax_I(fixmin_I(scalefactor, (INT)DFRACT_BITS - 1),
                          (INT) - (DFRACT_BITS - 1));

   for (i = 0; i < len; i++) {
     vector[i] = scaleValueSaturate(vector[i], scalefactor);
   }
 }
 #endif /* FUNCTION_scaleValuesSaturate_DBL */

 #ifndef FUNCTION_scaleValuesSaturate_DBL_DBL
 /*!
  *
  *  \brief  Multiply input vector by \f$ 2^{scalefactor} \f$
  *  \param dst         destination buffer
  *  \param src         source buffer
  *  \param len         length of vector
  *  \param scalefactor amount of shifts to be applied
  *  \return void
  *
  */
 #define FUNCTION_scaleValuesSaturate_DBL_DBL
 SCALE_INLINE
 void scaleValuesSaturate(FIXP_DBL *dst,  /*!< Output */
                          FIXP_DBL *src,  /*!< Input   */
                          INT len,        /*!< Length */
                          INT scalefactor /*!< Scalefactor */
 ) {
   INT i;

   /* Return if scalefactor is Zero */
   if (scalefactor == 0) {
     FDKmemmove(dst, src, len * sizeof(FIXP_DBL));
     return;
   }

   scalefactor = fixmax_I(fixmin_I(scalefactor, (INT)DFRACT_BITS - 1),
                          (INT) - (DFRACT_BITS - 1));

   for (i = 0; i < len; i++) {
     dst[i] = scaleValueSaturate(src[i], scalefactor);
   }
 }
 #endif /* FUNCTION_scaleValuesSaturate_DBL_DBL */

 #ifndef FUNCTION_scaleValuesSaturate_SGL_DBL
 /*!
  *
  *  \brief  Multiply input vector by \f$ 2^{scalefactor} \f$
  *  \param dst         destination buffer (FIXP_SGL)
  *  \param src         source buffer (FIXP_DBL)
  *  \param len         length of vector
  *  \param scalefactor amount of shifts to be applied
  *  \return void
  *
  */
 #define FUNCTION_scaleValuesSaturate_SGL_DBL
 SCALE_INLINE
 void scaleValuesSaturate(FIXP_SGL *dst,   /*!< Output */
                          FIXP_DBL *src,   /*!< Input   */
                          INT len,         /*!< Length */
                          INT scalefactor) /*!< Scalefactor */
 {
   INT i;
   scalefactor = fixmax_I(fixmin_I(scalefactor, (INT)DFRACT_BITS - 1),
                          (INT) - (DFRACT_BITS - 1));

   for (i = 0; i < len; i++) {
     dst[i] = FX_DBL2FX_SGL(fAddSaturate(scaleValueSaturate(src[i], scalefactor),
                                         (FIXP_DBL)0x8000));
   }
 }
 #endif /* FUNCTION_scaleValuesSaturate_SGL_DBL */

 #ifndef FUNCTION_scaleValuesSaturate_SGL
 /*!
  *
  *  \brief  Multiply input vector by \f$ 2^{scalefactor} \f$
  *  \param vector      source/destination buffer
  *  \param len         length of vector
  *  \param scalefactor amount of shifts to be applied
  *  \return void
  *
  */
 #define FUNCTION_scaleValuesSaturate_SGL
 SCALE_INLINE
 void scaleValuesSaturate(FIXP_SGL *vector, /*!< Vector */
                          INT len,          /*!< Length */
                          INT scalefactor   /*!< Scalefactor */
 ) {
   INT i;

   /* Return if scalefactor is Zero */
   if (scalefactor == 0) return;

   scalefactor = fixmax_I(fixmin_I(scalefactor, (INT)DFRACT_BITS - 1),
                          (INT) - (DFRACT_BITS - 1));

   for (i = 0; i < len; i++) {
     vector[i] = FX_DBL2FX_SGL(
         scaleValueSaturate(FX_SGL2FX_DBL(vector[i]), scalefactor));
   }
 }
 #endif /* FUNCTION_scaleValuesSaturate_SGL */

 #ifndef FUNCTION_scaleValuesSaturate_SGL_SGL
 /*!
  *
  *  \brief  Multiply input vector by \f$ 2^{scalefactor} \f$
  *  \param dst         destination buffer
  *  \param src         source buffer
  *  \param len         length of vector
  *  \param scalefactor amount of shifts to be applied
  *  \return void
  *
  */
 #define FUNCTION_scaleValuesSaturate_SGL_SGL
 SCALE_INLINE
 void scaleValuesSaturate(FIXP_SGL *dst,  /*!< Output */
                          FIXP_SGL *src,  /*!< Input */
                          INT len,        /*!< Length */
                          INT scalefactor /*!< Scalefactor */
 ) {
   INT i;

   /* Return if scalefactor is Zero */
   if (scalefactor == 0) {
     FDKmemmove(dst, src, len * sizeof(FIXP_SGL));
     return;
   }

   scalefactor = fixmax_I(fixmin_I(scalefactor, (INT)DFRACT_BITS - 1),
                          (INT) - (DFRACT_BITS - 1));

   for (i = 0; i < len; i++) {
     dst[i] =
         FX_DBL2FX_SGL(scaleValueSaturate(FX_SGL2FX_DBL(src[i]), scalefactor));
   }
 }
 #endif /* FUNCTION_scaleValuesSaturate_SGL_SGL */

 #ifndef FUNCTION_scaleValues_DBLDBL
 /*!
  *
  *  \brief  Multiply input vector src by \f$ 2^{scalefactor} \f$
  *          and place result into dst
  *  \param dst detination buffer
  *  \param src source buffer
  *  \param len must be larger than 4
  *  \param scalefactor amount of left shifts to be applied
  *  \return void
  *
  */
 #define FUNCTION_scaleValues_DBLDBL
 SCALE_INLINE
 void scaleValues(FIXP_DBL *dst,       /*!< dst Vector */
                  const FIXP_DBL *src, /*!< src Vector */
                  INT len,             /*!< Length */
                  INT scalefactor      /*!< Scalefactor */
 ) {
   INT i;

   /* Return if scalefactor is Zero */
   if (scalefactor == 0) {
     if (dst != src) FDKmemmove(dst, src, len * sizeof(FIXP_DBL));
   } else {
     if (scalefactor > 0) {
       scalefactor = fixmin_I(scalefactor, (INT)DFRACT_BITS - 1);
       for (i = len & 3; i--;) {
         *(dst++) = *(src++) << scalefactor;
       }
       for (i = len >> 2; i--;) {
         *(dst++) = *(src++) << scalefactor;
         *(dst++) = *(src++) << scalefactor;
         *(dst++) = *(src++) << scalefactor;
         *(dst++) = *(src++) << scalefactor;
       }
     } else {
       INT negScalefactor = fixmin_I(-scalefactor, (INT)DFRACT_BITS - 1);
       for (i = len & 3; i--;) {
         *(dst++) = *(src++) >> negScalefactor;
       }
       for (i = len >> 2; i--;) {
         *(dst++) = *(src++) >> negScalefactor;
         *(dst++) = *(src++) >> negScalefactor;
         *(dst++) = *(src++) >> negScalefactor;
         *(dst++) = *(src++) >> negScalefactor;
       }
     }
   }
 }
 #endif

 #if (SAMPLE_BITS == 16)
 #ifndef FUNCTION_scaleValues_PCMDBL
 /*!
  *
  *  \brief  Multiply input vector src by \f$ 2^{scalefactor} \f$
  *          and place result into dst
  *  \param dst detination buffer
  *  \param src source buffer
  *  \param len must be larger than 4
  *  \param scalefactor amount of left shifts to be applied
  *  \return void
  *
  */
 #define FUNCTION_scaleValues_PCMDBL
 SCALE_INLINE
 void scaleValues(FIXP_PCM *dst,       /*!< dst Vector */
                  const FIXP_DBL *src, /*!< src Vector */
                  INT len,             /*!< Length */
                  INT scalefactor      /*!< Scalefactor */
 ) {
   INT i;

   scalefactor -= DFRACT_BITS - SAMPLE_BITS;

   /* Return if scalefactor is Zero */
   {
     if (scalefactor > 0) {
       scalefactor = fixmin_I(scalefactor, (INT)DFRACT_BITS - 1);
       for (i = len & 3; i--;) {
         *(dst++) = (FIXP_PCM)(*(src++) << scalefactor);
       }
       for (i = len >> 2; i--;) {
         *(dst++) = (FIXP_PCM)(*(src++) << scalefactor);
         *(dst++) = (FIXP_PCM)(*(src++) << scalefactor);
         *(dst++) = (FIXP_PCM)(*(src++) << scalefactor);
         *(dst++) = (FIXP_PCM)(*(src++) << scalefactor);
       }
     } else {
       INT negScalefactor = fixmin_I(-scalefactor, (INT)DFRACT_BITS - 1);
       for (i = len & 3; i--;) {
         *(dst++) = (FIXP_PCM)(*(src++) >> negScalefactor);
       }
       for (i = len >> 2; i--;) {
         *(dst++) = (FIXP_PCM)(*(src++) >> negScalefactor);
         *(dst++) = (FIXP_PCM)(*(src++) >> negScalefactor);
         *(dst++) = (FIXP_PCM)(*(src++) >> negScalefactor);
         *(dst++) = (FIXP_PCM)(*(src++) >> negScalefactor);
       }
     }
   }
 }
 #endif
 #endif /* (SAMPLE_BITS == 16) */

 #ifndef FUNCTION_scaleValues_SGLSGL
 /*!
  *
  *  \brief  Multiply input vector src by \f$ 2^{scalefactor} \f$
  *          and place result into dst
  *  \param dst detination buffer
  *  \param src source buffer
  *  \param len must be larger than 4
  *  \param scalefactor amount of left shifts to be applied
  *  \return void
  *
  */
 #define FUNCTION_scaleValues_SGLSGL
 SCALE_INLINE
 void scaleValues(FIXP_SGL *dst,       /*!< dst Vector */
                  const FIXP_SGL *src, /*!< src Vector */
                  INT len,             /*!< Length */
                  INT scalefactor      /*!< Scalefactor */
 ) {
   INT i;

   /* Return if scalefactor is Zero */
   if (scalefactor == 0) {
     if (dst != src) FDKmemmove(dst, src, len * sizeof(FIXP_DBL));
   } else {
     if (scalefactor > 0) {
       scalefactor = fixmin_I(scalefactor, (INT)DFRACT_BITS - 1);
       for (i = len & 3; i--;) {
         *(dst++) = *(src++) << scalefactor;
       }
       for (i = len >> 2; i--;) {
         *(dst++) = *(src++) << scalefactor;
         *(dst++) = *(src++) << scalefactor;
         *(dst++) = *(src++) << scalefactor;
         *(dst++) = *(src++) << scalefactor;
       }
     } else {
       INT negScalefactor = fixmin_I(-scalefactor, (INT)DFRACT_BITS - 1);
       for (i = len & 3; i--;) {
         *(dst++) = *(src++) >> negScalefactor;
       }
       for (i = len >> 2; i--;) {
         *(dst++) = *(src++) >> negScalefactor;
         *(dst++) = *(src++) >> negScalefactor;
         *(dst++) = *(src++) >> negScalefactor;
         *(dst++) = *(src++) >> negScalefactor;
       }
     }
   }
 }
 #endif

 #ifndef FUNCTION_scaleValuesWithFactor_DBL
 /*!
  *
  *  \brief  Multiply input vector by \f$ 2^{scalefactor} \f$
  *  \param len must be larger than 4
  *  \return void
  *
  */
 #define FUNCTION_scaleValuesWithFactor_DBL
 SCALE_INLINE
 void scaleValuesWithFactor(FIXP_DBL *vector, FIXP_DBL factor, INT len,
                            INT scalefactor) {
   INT i;

   /* Compensate fMultDiv2 */
   scalefactor++;

   if (scalefactor > 0) {
     scalefactor = fixmin_I(scalefactor, (INT)DFRACT_BITS - 1);
     for (i = len & 3; i--;) {
       *vector = fMultDiv2(*vector, factor) << scalefactor;
       vector++;
     }
     for (i = len >> 2; i--;) {
       *vector = fMultDiv2(*vector, factor) << scalefactor;
       vector++;
       *vector = fMultDiv2(*vector, factor) << scalefactor;
       vector++;
       *vector = fMultDiv2(*vector, factor) << scalefactor;
       vector++;
       *vector = fMultDiv2(*vector, factor) << scalefactor;
       vector++;
     }
   } else {
     INT negScalefactor = fixmin_I(-scalefactor, (INT)DFRACT_BITS - 1);
     for (i = len & 3; i--;) {
       *vector = fMultDiv2(*vector, factor) >> negScalefactor;
       vector++;
     }
     for (i = len >> 2; i--;) {
       *vector = fMultDiv2(*vector, factor) >> negScalefactor;
       vector++;
       *vector = fMultDiv2(*vector, factor) >> negScalefactor;
       vector++;
       *vector = fMultDiv2(*vector, factor) >> negScalefactor;
       vector++;
       *vector = fMultDiv2(*vector, factor) >> negScalefactor;
       vector++;
     }
   }
 }
 #endif /* FUNCTION_scaleValuesWithFactor_DBL */

   /*******************************************

   IMPORTANT NOTE for usage of getScalefactor()

   If the input array contains negative values too, then these functions may
   sometimes return the actual maximum value minus 1, due to the nature of the
   applied algorithm. So be careful with possible fractional -1 values that may
   lead to overflows when being fPow2()'ed.

   ********************************************/

 #ifndef FUNCTION_getScalefactorShort
 /*!
  *
  *  \brief Calculate max possible scale factor for input vector of shorts
  *
  *  \return Maximum scale factor / possible left shift
  *
  */
 #define FUNCTION_getScalefactorShort
 SCALE_INLINE
 INT getScalefactorShort(const SHORT *vector, /*!< Pointer to input vector */
                         INT len              /*!< Length of input vector */
 ) {
   INT i;
   SHORT temp, maxVal = 0;

   for (i = len; i != 0; i--) {
     temp = (SHORT)(*vector++);
     maxVal |= (temp ^ (temp >> (SHORT_BITS - 1)));
   }

   return fixmax_I((INT)0, (INT)(fixnormz_D((INT)maxVal) - (INT)1 -
                                 (INT)(DFRACT_BITS - SHORT_BITS)));
 }
 #endif

 #ifndef FUNCTION_getScalefactorPCM
 /*!
  *
  *  \brief Calculate max possible scale factor for input vector of shorts
  *
  *  \return Maximum scale factor
  *
  */
 #define FUNCTION_getScalefactorPCM
 SCALE_INLINE
 INT getScalefactorPCM(const INT_PCM *vector, /*!< Pointer to input vector */
                       INT len,               /*!< Length of input vector */
                       INT stride) {
   INT i;
   INT_PCM temp, maxVal = 0;

   for (i = len; i != 0; i--) {
     temp = (INT_PCM)(*vector);
     vector += stride;
     maxVal |= (temp ^ (temp >> ((sizeof(INT_PCM) * 8) - 1)));
   }
   return fixmax_I((INT)0, (INT)(fixnormz_D((INT)maxVal) - (INT)1 -
                                 (INT)(DFRACT_BITS - SAMPLE_BITS)));
 }
 #endif

 #ifndef FUNCTION_getScalefactorShort
 /*!
  *
  *  \brief Calculate max possible scale factor for input vector of shorts
  *  \param stride, item increment between vector members.
  *  \return Maximum scale factor
  *
  */
 #define FUNCTION_getScalefactorShort
 SCALE_INLINE
 INT getScalefactorShort(const SHORT *vector, /*!< Pointer to input vector */
                         INT len,             /*!< Length of input vector */
                         INT stride) {
   INT i;
   SHORT temp, maxVal = 0;

   for (i = len; i != 0; i--) {
     temp = (SHORT)(*vector);
     vector += stride;
     maxVal |= (temp ^ (temp >> (SHORT_BITS - 1)));
   }

   return fixmax_I((INT)0, (INT)(fixnormz_D((INT)maxVal) - (INT)1 -
                                 (INT)(DFRACT_BITS - SHORT_BITS)));
 }
 #endif

 #ifndef FUNCTION_getScalefactor_DBL
 /*!
  *
  *  \brief Calculate max possible scale factor for input vector
  *
  *  \return Maximum scale factor
  *
  *  This function can constitute a significant amount of computational
  * complexity - very much depending on the bitrate. Since it is a rather small
  * function, effective assembler optimization might be possible.
  *
  *  If all data is 0xFFFF.FFFF or 0x0000.0000 function returns 31
  *  Note: You can skip data normalization only if return value is 0
  *
  */
 #define FUNCTION_getScalefactor_DBL
 SCALE_INLINE
 INT getScalefactor(const FIXP_DBL *vector, /*!< Pointer to input vector */
                    INT len)                /*!< Length of input vector */
 {
   INT i;
   FIXP_DBL temp, maxVal = (FIXP_DBL)0;

   for (i = len; i != 0; i--) {
     temp = (LONG)(*vector++);
     maxVal |= (FIXP_DBL)((LONG)temp ^ (LONG)(temp >> (DFRACT_BITS - 1)));
   }

   return fixmax_I((INT)0, (INT)(fixnormz_D(maxVal) - 1));
 }
 #endif

 #ifndef FUNCTION_getScalefactor_SGL
 #define FUNCTION_getScalefactor_SGL
 SCALE_INLINE
 INT getScalefactor(const FIXP_SGL *vector, /*!< Pointer to input vector */
                    INT len)                /*!< Length of input vector */
 {
   INT i;
   SHORT temp, maxVal = (FIXP_SGL)0;

   for (i = len; i != 0; i--) {
     temp = (SHORT)(*vector++);
     maxVal |= (temp ^ (temp >> (FRACT_BITS - 1)));
   }

   return fixmax_I((INT)0, (INT)(fixnormz_S((FIXP_SGL)maxVal)) - 1);
 }
 #endif
	/* -----------------------------------------------------------------------------
	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: Scaling operations

	*******************************************************************************/

	#include "common_fix.h"

	#include "genericStds.h"

	/**************************************************
	* Inline definitions
	**************************************************/

	#include "scale.h"

	#if defined(__mips__)
	#include "mips/scale_mips.cpp"

	#elif defined(__arm__)
	#include "arm/scale_arm.cpp"

	#endif

	#ifndef FUNCTION_scaleValues_SGL
	/*!
	*
	* \brief Multiply input vector by \f$ 2^{scalefactor} \f$
	* \param len must be larger than 4
	* \return void
	*
	*/
	#define FUNCTION_scaleValues_SGL
	void scaleValues(FIXP_SGL vector, /!< Vector */
	INT len, /!< Length /
	INT scalefactor /!< Scalefactor /
	) {
	INT i;

	/* Return if scalefactor is Zero */
	if (scalefactor == 0) return;

	if (scalefactor > 0) {
	scalefactor = fixmin_I(scalefactor, (INT)(FRACT_BITS - 1));
	for (i = len & 3; i--;) {
	*(vector++) <<= scalefactor;
	}
	for (i = len >> 2; i--;) {
	*(vector++) <<= scalefactor;
	*(vector++) <<= scalefactor;
	*(vector++) <<= scalefactor;
	*(vector++) <<= scalefactor;
	}
	} else {
	INT negScalefactor = fixmin_I(-scalefactor, (INT)FRACT_BITS - 1);
	for (i = len & 3; i--;) {
	*(vector++) >>= negScalefactor;
	}
	for (i = len >> 2; i--;) {
	*(vector++) >>= negScalefactor;
	*(vector++) >>= negScalefactor;
	*(vector++) >>= negScalefactor;
	*(vector++) >>= negScalefactor;
	}
	}
	}
	#endif

	#ifndef FUNCTION_scaleValues_DBL
	/*!
	*
	* \brief Multiply input vector by \f$ 2^{scalefactor} \f$
	* \param len must be larger than 4
	* \return void
	*
	*/
	#define FUNCTION_scaleValues_DBL
	SCALE_INLINE
	void scaleValues(FIXP_DBL vector, /!< Vector */
	INT len, /!< Length /
	INT scalefactor /!< Scalefactor /
	) {
	INT i;

	/* Return if scalefactor is Zero */
	if (scalefactor == 0) return;

	if (scalefactor > 0) {
	scalefactor = fixmin_I(scalefactor, (INT)DFRACT_BITS - 1);
	for (i = len & 3; i--;) {
	*(vector++) <<= scalefactor;
	}
	for (i = len >> 2; i--;) {
	*(vector++) <<= scalefactor;
	*(vector++) <<= scalefactor;
	*(vector++) <<= scalefactor;
	*(vector++) <<= scalefactor;
	}
	} else {
	INT negScalefactor = fixmin_I(-scalefactor, (INT)DFRACT_BITS - 1);
	for (i = len & 3; i--;) {
	*(vector++) >>= negScalefactor;
	}
	for (i = len >> 2; i--;) {
	*(vector++) >>= negScalefactor;
	*(vector++) >>= negScalefactor;
	*(vector++) >>= negScalefactor;
	*(vector++) >>= negScalefactor;
	}
	}
	}
	#endif

	#ifndef FUNCTION_scaleValuesSaturate_DBL
	/*!
	*
	* \brief Multiply input vector by \f$ 2^{scalefactor} \f$
	* \param vector source/destination buffer
	* \param len length of vector
	* \param scalefactor amount of shifts to be applied
	* \return void
	*
	*/
	#define FUNCTION_scaleValuesSaturate_DBL
	SCALE_INLINE
	void scaleValuesSaturate(FIXP_DBL vector, /!< Vector */
	INT len, /!< Length /
	INT scalefactor /!< Scalefactor /
	) {
	INT i;

	/* Return if scalefactor is Zero */
	if (scalefactor == 0) return;

	scalefactor = fixmax_I(fixmin_I(scalefactor, (INT)DFRACT_BITS - 1),
	(INT) - (DFRACT_BITS - 1));

	for (i = 0; i < len; i++) {
	vector[i] = scaleValueSaturate(vector[i], scalefactor);
	}
	}
	#endif /* FUNCTION_scaleValuesSaturate_DBL */

	#ifndef FUNCTION_scaleValuesSaturate_DBL_DBL
	/*!
	*
	* \brief Multiply input vector by \f$ 2^{scalefactor} \f$
	* \param dst destination buffer
	* \param src source buffer
	* \param len length of vector
	* \param scalefactor amount of shifts to be applied
	* \return void
	*
	*/
	#define FUNCTION_scaleValuesSaturate_DBL_DBL
	SCALE_INLINE
	void scaleValuesSaturate(FIXP_DBL dst, /!< Output */
	FIXP_DBL src, /!< Input */
	INT len, /!< Length /
	INT scalefactor /!< Scalefactor /
	) {
	INT i;

	/* Return if scalefactor is Zero */
	if (scalefactor == 0) {
	FDKmemmove(dst, src, len * sizeof(FIXP_DBL));
	return;
	}

	scalefactor = fixmax_I(fixmin_I(scalefactor, (INT)DFRACT_BITS - 1),
	(INT) - (DFRACT_BITS - 1));

	for (i = 0; i < len; i++) {
	dst[i] = scaleValueSaturate(src[i], scalefactor);
	}
	}
	#endif /* FUNCTION_scaleValuesSaturate_DBL_DBL */

	#ifndef FUNCTION_scaleValuesSaturate_SGL_DBL
	/*!
	*
	* \brief Multiply input vector by \f$ 2^{scalefactor} \f$
	* \param dst destination buffer (FIXP_SGL)
	* \param src source buffer (FIXP_DBL)
	* \param len length of vector
	* \param scalefactor amount of shifts to be applied
	* \return void
	*
	*/
	#define FUNCTION_scaleValuesSaturate_SGL_DBL
	SCALE_INLINE
	void scaleValuesSaturate(FIXP_SGL dst, /!< Output */
	FIXP_DBL src, /!< Input */
	INT len, /!< Length /
	INT scalefactor) /!< Scalefactor /
	{
	INT i;
	scalefactor = fixmax_I(fixmin_I(scalefactor, (INT)DFRACT_BITS - 1),
	(INT) - (DFRACT_BITS - 1));

	for (i = 0; i < len; i++) {
	dst[i] = FX_DBL2FX_SGL(fAddSaturate(scaleValueSaturate(src[i], scalefactor),
	(FIXP_DBL)0x8000));
	}
	}
	#endif /* FUNCTION_scaleValuesSaturate_SGL_DBL */

	#ifndef FUNCTION_scaleValuesSaturate_SGL
	/*!
	*
	* \brief Multiply input vector by \f$ 2^{scalefactor} \f$
	* \param vector source/destination buffer
	* \param len length of vector
	* \param scalefactor amount of shifts to be applied
	* \return void
	*
	*/
	#define FUNCTION_scaleValuesSaturate_SGL
	SCALE_INLINE
	void scaleValuesSaturate(FIXP_SGL vector, /!< Vector */
	INT len, /!< Length /
	INT scalefactor /!< Scalefactor /
	) {
	INT i;

	/* Return if scalefactor is Zero */
	if (scalefactor == 0) return;

	scalefactor = fixmax_I(fixmin_I(scalefactor, (INT)DFRACT_BITS - 1),
	(INT) - (DFRACT_BITS - 1));

	for (i = 0; i < len; i++) {
	vector[i] = FX_DBL2FX_SGL(
	scaleValueSaturate(FX_SGL2FX_DBL(vector[i]), scalefactor));
	}
	}
	#endif /* FUNCTION_scaleValuesSaturate_SGL */

	#ifndef FUNCTION_scaleValuesSaturate_SGL_SGL
	/*!
	*
	* \brief Multiply input vector by \f$ 2^{scalefactor} \f$
	* \param dst destination buffer
	* \param src source buffer
	* \param len length of vector
	* \param scalefactor amount of shifts to be applied
	* \return void
	*
	*/
	#define FUNCTION_scaleValuesSaturate_SGL_SGL
	SCALE_INLINE
	void scaleValuesSaturate(FIXP_SGL dst, /!< Output */
	FIXP_SGL src, /!< Input */
	INT len, /!< Length /
	INT scalefactor /!< Scalefactor /
	) {
	INT i;

	/* Return if scalefactor is Zero */
	if (scalefactor == 0) {
	FDKmemmove(dst, src, len * sizeof(FIXP_SGL));
	return;
	}

	scalefactor = fixmax_I(fixmin_I(scalefactor, (INT)DFRACT_BITS - 1),
	(INT) - (DFRACT_BITS - 1));

	for (i = 0; i < len; i++) {
	dst[i] =
	FX_DBL2FX_SGL(scaleValueSaturate(FX_SGL2FX_DBL(src[i]), scalefactor));
	}
	}
	#endif /* FUNCTION_scaleValuesSaturate_SGL_SGL */

	#ifndef FUNCTION_scaleValues_DBLDBL
	/*!
	*
	* \brief Multiply input vector src by \f$ 2^{scalefactor} \f$
	* and place result into dst
	* \param dst detination buffer
	* \param src source buffer
	* \param len must be larger than 4
	* \param scalefactor amount of left shifts to be applied
	* \return void
	*
	*/
	#define FUNCTION_scaleValues_DBLDBL
	SCALE_INLINE
	void scaleValues(FIXP_DBL dst, /!< dst Vector */
	const FIXP_DBL src, /!< src Vector */
	INT len, /!< Length /
	INT scalefactor /!< Scalefactor /
	) {
	INT i;

	/* Return if scalefactor is Zero */
	if (scalefactor == 0) {
	if (dst != src) FDKmemmove(dst, src, len * sizeof(FIXP_DBL));
	} else {
	if (scalefactor > 0) {
	scalefactor = fixmin_I(scalefactor, (INT)DFRACT_BITS - 1);
	for (i = len & 3; i--;) {
	(dst++) = (src++) << scalefactor;
	}
	for (i = len >> 2; i--;) {
	(dst++) = (src++) << scalefactor;
	(dst++) = (src++) << scalefactor;
	(dst++) = (src++) << scalefactor;
	(dst++) = (src++) << scalefactor;
	}
	} else {
	INT negScalefactor = fixmin_I(-scalefactor, (INT)DFRACT_BITS - 1);
	for (i = len & 3; i--;) {
	(dst++) = (src++) >> negScalefactor;
	}
	for (i = len >> 2; i--;) {
	(dst++) = (src++) >> negScalefactor;
	(dst++) = (src++) >> negScalefactor;
	(dst++) = (src++) >> negScalefactor;
	(dst++) = (src++) >> negScalefactor;
	}
	}
	}
	}
	#endif

	#if (SAMPLE_BITS == 16)
	#ifndef FUNCTION_scaleValues_PCMDBL
	/*!
	*
	* \brief Multiply input vector src by \f$ 2^{scalefactor} \f$
	* and place result into dst
	* \param dst detination buffer
	* \param src source buffer
	* \param len must be larger than 4
	* \param scalefactor amount of left shifts to be applied
	* \return void
	*
	*/
	#define FUNCTION_scaleValues_PCMDBL
	SCALE_INLINE
	void scaleValues(FIXP_PCM dst, /!< dst Vector */
	const FIXP_DBL src, /!< src Vector */
	INT len, /!< Length /
	INT scalefactor /!< Scalefactor /
	) {
	INT i;

	scalefactor -= DFRACT_BITS - SAMPLE_BITS;

	/* Return if scalefactor is Zero */
	{
	if (scalefactor > 0) {
	scalefactor = fixmin_I(scalefactor, (INT)DFRACT_BITS - 1);
	for (i = len & 3; i--;) {
	(dst++) = (FIXP_PCM)((src++) << scalefactor);
	}
	for (i = len >> 2; i--;) {
	(dst++) = (FIXP_PCM)((src++) << scalefactor);
	(dst++) = (FIXP_PCM)((src++) << scalefactor);
	(dst++) = (FIXP_PCM)((src++) << scalefactor);
	(dst++) = (FIXP_PCM)((src++) << scalefactor);
	}
	} else {
	INT negScalefactor = fixmin_I(-scalefactor, (INT)DFRACT_BITS - 1);
	for (i = len & 3; i--;) {
	(dst++) = (FIXP_PCM)((src++) >> negScalefactor);
	}
	for (i = len >> 2; i--;) {
	(dst++) = (FIXP_PCM)((src++) >> negScalefactor);
	(dst++) = (FIXP_PCM)((src++) >> negScalefactor);
	(dst++) = (FIXP_PCM)((src++) >> negScalefactor);
	(dst++) = (FIXP_PCM)((src++) >> negScalefactor);
	}
	}
	}
	}
	#endif
	#endif /* (SAMPLE_BITS == 16) */

	#ifndef FUNCTION_scaleValues_SGLSGL
	/*!
	*
	* \brief Multiply input vector src by \f$ 2^{scalefactor} \f$
	* and place result into dst
	* \param dst detination buffer
	* \param src source buffer
	* \param len must be larger than 4
	* \param scalefactor amount of left shifts to be applied
	* \return void
	*
	*/
	#define FUNCTION_scaleValues_SGLSGL
	SCALE_INLINE
	void scaleValues(FIXP_SGL dst, /!< dst Vector */
	const FIXP_SGL src, /!< src Vector */
	INT len, /!< Length /
	INT scalefactor /!< Scalefactor /
	) {
	INT i;

	/* Return if scalefactor is Zero */
	if (scalefactor == 0) {
	if (dst != src) FDKmemmove(dst, src, len * sizeof(FIXP_DBL));
	} else {
	if (scalefactor > 0) {
	scalefactor = fixmin_I(scalefactor, (INT)DFRACT_BITS - 1);
	for (i = len & 3; i--;) {
	(dst++) = (src++) << scalefactor;
	}
	for (i = len >> 2; i--;) {
	(dst++) = (src++) << scalefactor;
	(dst++) = (src++) << scalefactor;
	(dst++) = (src++) << scalefactor;
	(dst++) = (src++) << scalefactor;
	}
	} else {
	INT negScalefactor = fixmin_I(-scalefactor, (INT)DFRACT_BITS - 1);
	for (i = len & 3; i--;) {
	(dst++) = (src++) >> negScalefactor;
	}
	for (i = len >> 2; i--;) {
	(dst++) = (src++) >> negScalefactor;
	(dst++) = (src++) >> negScalefactor;
	(dst++) = (src++) >> negScalefactor;
	(dst++) = (src++) >> negScalefactor;
	}
	}
	}
	}
	#endif

	#ifndef FUNCTION_scaleValuesWithFactor_DBL
	/*!
	*
	* \brief Multiply input vector by \f$ 2^{scalefactor} \f$
	* \param len must be larger than 4
	* \return void
	*
	*/
	#define FUNCTION_scaleValuesWithFactor_DBL
	SCALE_INLINE
	void scaleValuesWithFactor(FIXP_DBL *vector, FIXP_DBL factor, INT len,
	INT scalefactor) {
	INT i;

	/* Compensate fMultDiv2 */
	scalefactor++;

	if (scalefactor > 0) {
	scalefactor = fixmin_I(scalefactor, (INT)DFRACT_BITS - 1);
	for (i = len & 3; i--;) {
	vector = fMultDiv2(vector, factor) << scalefactor;
	vector++;
	}
	for (i = len >> 2; i--;) {
	vector = fMultDiv2(vector, factor) << scalefactor;
	vector++;
	vector = fMultDiv2(vector, factor) << scalefactor;
	vector++;
	vector = fMultDiv2(vector, factor) << scalefactor;
	vector++;
	vector = fMultDiv2(vector, factor) << scalefactor;
	vector++;
	}
	} else {
	INT negScalefactor = fixmin_I(-scalefactor, (INT)DFRACT_BITS - 1);
	for (i = len & 3; i--;) {
	vector = fMultDiv2(vector, factor) >> negScalefactor;
	vector++;
	}
	for (i = len >> 2; i--;) {
	vector = fMultDiv2(vector, factor) >> negScalefactor;
	vector++;
	vector = fMultDiv2(vector, factor) >> negScalefactor;
	vector++;
	vector = fMultDiv2(vector, factor) >> negScalefactor;
	vector++;
	vector = fMultDiv2(vector, factor) >> negScalefactor;
	vector++;
	}
	}
	}
	#endif /* FUNCTION_scaleValuesWithFactor_DBL */

	/*******************************************

	IMPORTANT NOTE for usage of getScalefactor()

	If the input array contains negative values too, then these functions may
	sometimes return the actual maximum value minus 1, due to the nature of the
	applied algorithm. So be careful with possible fractional -1 values that may
	lead to overflows when being fPow2()'ed.

	********************************************/

	#ifndef FUNCTION_getScalefactorShort
	/*!
	*
	* \brief Calculate max possible scale factor for input vector of shorts
	*
	* \return Maximum scale factor / possible left shift
	*
	*/
	#define FUNCTION_getScalefactorShort
	SCALE_INLINE
	INT getScalefactorShort(const SHORT vector, /!< Pointer to input vector */
	INT len /!< Length of input vector /
	) {
	INT i;
	SHORT temp, maxVal = 0;

	for (i = len; i != 0; i--) {
	temp = (SHORT)(*vector++);
	maxVal \|= (temp ^ (temp >> (SHORT_BITS - 1)));
	}

	return fixmax_I((INT)0, (INT)(fixnormz_D((INT)maxVal) - (INT)1 -
	(INT)(DFRACT_BITS - SHORT_BITS)));
	}
	#endif

	#ifndef FUNCTION_getScalefactorPCM
	/*!
	*
	* \brief Calculate max possible scale factor for input vector of shorts
	*
	* \return Maximum scale factor
	*
	*/
	#define FUNCTION_getScalefactorPCM
	SCALE_INLINE
	INT getScalefactorPCM(const INT_PCM vector, /!< Pointer to input vector */
	INT len, /!< Length of input vector /
	INT stride) {
	INT i;
	INT_PCM temp, maxVal = 0;

	for (i = len; i != 0; i--) {
	temp = (INT_PCM)(*vector);
	vector += stride;
	maxVal \|= (temp ^ (temp >> ((sizeof(INT_PCM) * 8) - 1)));
	}
	return fixmax_I((INT)0, (INT)(fixnormz_D((INT)maxVal) - (INT)1 -
	(INT)(DFRACT_BITS - SAMPLE_BITS)));
	}
	#endif

	#ifndef FUNCTION_getScalefactorShort
	/*!
	*
	* \brief Calculate max possible scale factor for input vector of shorts
	* \param stride, item increment between vector members.
	* \return Maximum scale factor
	*
	*/
	#define FUNCTION_getScalefactorShort
	SCALE_INLINE
	INT getScalefactorShort(const SHORT vector, /!< Pointer to input vector */
	INT len, /!< Length of input vector /
	INT stride) {
	INT i;
	SHORT temp, maxVal = 0;

	for (i = len; i != 0; i--) {
	temp = (SHORT)(*vector);
	vector += stride;
	maxVal \|= (temp ^ (temp >> (SHORT_BITS - 1)));
	}

	return fixmax_I((INT)0, (INT)(fixnormz_D((INT)maxVal) - (INT)1 -
	(INT)(DFRACT_BITS - SHORT_BITS)));
	}
	#endif

	#ifndef FUNCTION_getScalefactor_DBL
	/*!
	*
	* \brief Calculate max possible scale factor for input vector
	*
	* \return Maximum scale factor
	*
	* This function can constitute a significant amount of computational
	* complexity - very much depending on the bitrate. Since it is a rather small
	* function, effective assembler optimization might be possible.
	*
	* If all data is 0xFFFF.FFFF or 0x0000.0000 function returns 31
	* Note: You can skip data normalization only if return value is 0
	*
	*/
	#define FUNCTION_getScalefactor_DBL
	SCALE_INLINE
	INT getScalefactor(const FIXP_DBL vector, /!< Pointer to input vector */
	INT len) /!< Length of input vector /
	{
	INT i;
	FIXP_DBL temp, maxVal = (FIXP_DBL)0;

	for (i = len; i != 0; i--) {
	temp = (LONG)(*vector++);
	maxVal \|= (FIXP_DBL)((LONG)temp ^ (LONG)(temp >> (DFRACT_BITS - 1)));
	}

	return fixmax_I((INT)0, (INT)(fixnormz_D(maxVal) - 1));
	}
	#endif

	#ifndef FUNCTION_getScalefactor_SGL
	#define FUNCTION_getScalefactor_SGL
	SCALE_INLINE
	INT getScalefactor(const FIXP_SGL vector, /!< Pointer to input vector */
	INT len) /!< Length of input vector /
	{
	INT i;
	SHORT temp, maxVal = (FIXP_SGL)0;

	for (i = len; i != 0; i--) {
	temp = (SHORT)(*vector++);
	maxVal \|= (temp ^ (temp >> (FRACT_BITS - 1)));
	}

	return fixmax_I((INT)0, (INT)(fixnormz_S((FIXP_SGL)maxVal)) - 1);
	}
	#endif