libAACdec/src/aacdec_pns.cpp - platform/external/aac - Git at Google


 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android

 © Copyright  1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.

  1.    INTRODUCTION
 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
 This FDK AAC Codec software is intended to be used on a wide variety of Android devices.

 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
 of the MPEG specifications.

 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
 individually for the purpose of encoding or decoding bit streams in products that are compliant with
 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
 software may already be covered under those patent licenses when it is used for those licensed purposes only.

 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
 applications information and documentation.

 2.    COPYRIGHT LICENSE

 Redistribution and use in source and binary forms, with or without modification, are permitted without
 payment of copyright license fees provided that you satisfy the following conditions:

 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
 your modifications thereto in source code form.

 You must retain the complete text of this software license in the documentation and/or other materials
 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
 modifications thereto to recipients of copies in binary form.

 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
 prior written permission.

 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
 software or your modifications thereto.

 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
 and the date of any change. For modified versions of the FDK AAC Codec, the term
 "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
 "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."

 3.    NO PATENT LICENSE

 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
 respect to this software.

 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
 by appropriate patent licenses.

 4.    DISCLAIMER

 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
 "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
 including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
 or business interruption, however caused and on any theory of liability, whether in contract, strict
 liability, or tort (including negligence), arising in any way out of the use of this software, even if
 advised of the possibility of such damage.

 5.    CONTACT INFORMATION

 Fraunhofer Institute for Integrated Circuits IIS
 Attention: Audio and Multimedia Departments - FDK AAC LL
 Am Wolfsmantel 33
 91058 Erlangen, Germany

 www.iis.fraunhofer.de/amm
 amm-info@iis.fraunhofer.de
 ----------------------------------------------------------------------------------------------------------- */

 /*****************************  MPEG-4 AAC Decoder  **************************

    Author(s):   Josef Hoepfl
    Description: perceptual noise substitution tool

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

 #include "aacdec_pns.h"


 #include "aac_ram.h"
 #include "aac_rom.h"
 #include "channelinfo.h"
 #include "block.h"
 #include "FDK_bitstream.h"

 #include "genericStds.h"


 #define NOISE_OFFSET 90           /* cf. ISO 14496-3 p. 175 */

 /*!
   \brief Reset InterChannel and PNS data

   The function resets the InterChannel and PNS data
 */
 void CPns_ResetData(
     CPnsData *pPnsData,
     CPnsInterChannelData *pPnsInterChannelData
     )
 {
   /* Assign pointer always, since pPnsData is not persistent data */
   pPnsData->pPnsInterChannelData = pPnsInterChannelData;
   pPnsData->PnsActive = 0;
   pPnsData->CurrentEnergy = 0;

   FDKmemclear(pPnsData->pnsUsed,(8*16)*sizeof(UCHAR));
   FDKmemclear(pPnsInterChannelData->correlated,(8*16)*sizeof(UCHAR));
 }

 /*!
   \brief Initialize PNS data

   The function initializes the PNS data
 */
 void CPns_InitPns(
     CPnsData *pPnsData,
     CPnsInterChannelData *pPnsInterChannelData,
     INT* currentSeed, INT* randomSeed)
 {
   /* save pointer to inter channel data */
   pPnsData->pPnsInterChannelData = pPnsInterChannelData;

   /* use pointer because seed has to be
      same, left and right channel ! */
   pPnsData->currentSeed = currentSeed;
   pPnsData->randomSeed  = randomSeed;
 }

 /*!
   \brief Indicates if PNS is used

   The function returns a value indicating whether PNS is used or not
   acordding to the noise energy

   \return  PNS used
 */
 int CPns_IsPnsUsed (const CPnsData *pPnsData,
                     const int group,
                     const int band)
 {
   unsigned pns_band = group*16+band;

   return pPnsData->pnsUsed[pns_band] & (UCHAR)1;
 }

 /*!
   \brief Set correlation

   The function activates the noise correlation between the channel pair
 */
 void CPns_SetCorrelation(CPnsData *pPnsData,
                          const int group,
                          const int band,
                          const int outofphase)
 {
   CPnsInterChannelData *pInterChannelData = pPnsData->pPnsInterChannelData;
   unsigned pns_band = group*16+band;

   pInterChannelData->correlated[pns_band] = (outofphase) ? 3 : 1;
 }

 /*!
   \brief Indicates if correlation is used

   The function indicates if the noise correlation between the channel pair
   is activated

   \return  PNS is correlated
 */
 static
 int CPns_IsCorrelated(const CPnsData *pPnsData,
                       const int group,
                       const int band)
 {
   CPnsInterChannelData *pInterChannelData = pPnsData->pPnsInterChannelData;
   unsigned pns_band = group*16+band;

   return (pInterChannelData->correlated[pns_band] & 0x01) ? 1 : 0;
 }

 /*!
   \brief Indicates if correlated out of phase mode is used.

   The function indicates if the noise correlation between the channel pair
   is activated in out-of-phase mode.

   \return  PNS is out-of-phase
 */
 static
 int CPns_IsOutOfPhase(const CPnsData *pPnsData,
                       const int group,
                       const int band)
 {
   CPnsInterChannelData *pInterChannelData = pPnsData->pPnsInterChannelData;
   unsigned pns_band = group*16+band;

   return (pInterChannelData->correlated[pns_band] & 0x02) ? 1 : 0;
 }

 /*!
   \brief Read PNS information

   The function reads the PNS information from the bitstream
 */
 void CPns_Read (CPnsData *pPnsData,
                 HANDLE_FDK_BITSTREAM bs,
                 const CodeBookDescription *hcb,
                 SHORT *pScaleFactor,
                 UCHAR global_gain,
                 int band,
                 int group /* = 0 */)
 {
   int delta ;
   UINT pns_band = group*16+band;

   if (pPnsData->PnsActive) {
     /* Next PNS band case */
     delta = CBlock_DecodeHuffmanWord (bs, hcb) - 60;
   } else {
     /* First PNS band case */
     int noiseStartValue = FDKreadBits(bs,9);

     delta = noiseStartValue - 256 ;
     pPnsData->PnsActive = 1;
     pPnsData->CurrentEnergy = global_gain - NOISE_OFFSET;
   }

   pPnsData->CurrentEnergy += delta ;
   pScaleFactor[pns_band] = pPnsData->CurrentEnergy;

   pPnsData->pnsUsed[pns_band] = 1;
 }


 /**
  * \brief Generate a vector of noise of given length. The noise values are
  *        scaled in order to yield a noise energy of 1.0
  * \param spec pointer to were the noise values will be written to.
  * \param size amount of noise values to be generated.
  * \param pRandomState pointer to the state of the random generator being used.
  * \return exponent of generated noise vector.
  */
 static int GenerateRandomVector (FIXP_DBL *RESTRICT spec,
                                   int size,
                                   int *pRandomState)
 {
   int i, invNrg_e = 0, nrg_e = 0;
   FIXP_DBL invNrg_m, nrg_m = FL2FXCONST_DBL(0.0f) ;
   FIXP_DBL *RESTRICT ptr = spec;
   int randomState = *pRandomState;

 #define GEN_NOISE_NRG_SCALE 7

   /* Generate noise and calculate energy. */
   for (i=0; i<size; i++)
   {
     randomState = (1664525L * randomState) + 1013904223L; // Numerical Recipes
     nrg_m = fPow2AddDiv2(nrg_m, (FIXP_DBL)randomState>>GEN_NOISE_NRG_SCALE);
     *ptr++ = (FIXP_DBL)randomState;
   }
   nrg_e = GEN_NOISE_NRG_SCALE*2 + 1;

   /* weight noise with = 1 / sqrt_nrg; */
   invNrg_m = invSqrtNorm2(nrg_m<<1, &invNrg_e);
   invNrg_e += -((nrg_e-1)>>1);

   for (i=size; i--; )
   {
     spec[i] = fMult(spec[i], invNrg_m);
   }

   /* Store random state */
   *pRandomState = randomState;

   return invNrg_e;
 }

 static void ScaleBand (FIXP_DBL *RESTRICT spec, int size, int scaleFactor, int specScale, int noise_e, int out_of_phase)
 {
   int i, shift, sfExponent;
   FIXP_DBL sfMatissa;

   /* Get gain from scale factor value = 2^(scaleFactor * 0.25) */
   sfMatissa = MantissaTable[scaleFactor & 0x03][0];
   /* sfExponent = (scaleFactor >> 2) + ExponentTable[scaleFactor & 0x03][0]; */
   /* Note:  ExponentTable[scaleFactor & 0x03][0] is always 1. */
   sfExponent = (scaleFactor >> 2) + 1;

   if (out_of_phase != 0) {
     sfMatissa = -sfMatissa;
   }

   /* +1 because of fMultDiv2 below. */
   shift = sfExponent - specScale + 1 + noise_e;

   /* Apply gain to noise values */
   if (shift>=0) {
     shift = fixMin( shift, DFRACT_BITS-1 );
     for (i = size ; i-- != 0; ) {
       spec [i] = fMultDiv2 (spec [i], sfMatissa) << shift;
     }
   } else {
     shift = fixMin( -shift, DFRACT_BITS-1 );
     for (i = size ; i-- != 0; ) {
       spec [i] = fMultDiv2 (spec [i], sfMatissa) >> shift;
     }
   }
 }


 /*!
   \brief Apply PNS

   The function applies PNS (i.e. it generates noise) on the bands
   flagged as noisy bands

 */
 void CPns_Apply (const CPnsData *pPnsData,
                  const CIcsInfo *pIcsInfo,
                  SPECTRAL_PTR pSpectrum,
                  const SHORT    *pSpecScale,
                  const SHORT    *pScaleFactor,
                  const SamplingRateInfo *pSamplingRateInfo,
                  const INT granuleLength,
                  const int channel)
 {
   if (pPnsData->PnsActive) {
     const short *BandOffsets = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo);

     int ScaleFactorBandsTransmitted = GetScaleFactorBandsTransmitted(pIcsInfo);

     for (int window = 0, group = 0; group < GetWindowGroups(pIcsInfo); group++) {
       for (int groupwin = 0; groupwin < GetWindowGroupLength(pIcsInfo, group); groupwin++, window++) {
         FIXP_DBL *spectrum = SPEC(pSpectrum, window, granuleLength);

         for (int band = 0 ; band < ScaleFactorBandsTransmitted; band++) {
           if (CPns_IsPnsUsed (pPnsData, group, band)) {
             UINT pns_band = group*16+band;

             int bandWidth = BandOffsets [band + 1] - BandOffsets [band] ;
             int noise_e;

             FDK_ASSERT(bandWidth >= 0);

             if (channel > 0 && CPns_IsCorrelated(pPnsData, group, band))
             {
               noise_e = GenerateRandomVector (spectrum + BandOffsets [band], bandWidth,
                                     &pPnsData->randomSeed [pns_band]) ;
             }
             else
             {
               pPnsData->randomSeed [pns_band] = *pPnsData->currentSeed ;

               noise_e = GenerateRandomVector (spectrum + BandOffsets [band], bandWidth,
                                     pPnsData->currentSeed) ;
             }

             int outOfPhase  = CPns_IsOutOfPhase (pPnsData, group, band);

             ScaleBand (spectrum + BandOffsets [band], bandWidth,
                        pScaleFactor[pns_band],
                        pSpecScale[window], noise_e, outOfPhase) ;
           }
         }
       }
     }
   }
 }

	/* -----------------------------------------------------------------------------------------------------------
	Software License for The Fraunhofer FDK AAC Codec Library for Android

	© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
	All rights reserved.

	1. INTRODUCTION
	The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
	the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
	This FDK AAC Codec software is intended to be used on a wide variety of Android devices.

	AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
	audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
	independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
	of the MPEG specifications.

	Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
	may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
	individually for the purpose of encoding or decoding bit streams in products that are compliant with
	the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
	these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
	software may already be covered under those patent licenses when it is used for those licensed purposes only.

	Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
	are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
	applications information and documentation.

	2. COPYRIGHT LICENSE

	Redistribution and use in source and binary forms, with or without modification, are permitted without
	payment of copyright license fees provided that you satisfy the following conditions:

	You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
	your modifications thereto in source code form.

	You must retain the complete text of this software license in the documentation and/or other materials
	provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
	You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
	modifications thereto to recipients of copies in binary form.

	The name of Fraunhofer may not be used to endorse or promote products derived from this library without
	prior written permission.

	You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
	software or your modifications thereto.

	Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
	and the date of any change. For modified versions of the FDK AAC Codec, the term
	"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
	"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."

	3. NO PATENT LICENSE

	NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
	ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
	respect to this software.

	You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
	by appropriate patent licenses.

	4. DISCLAIMER

	This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
	"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
	of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
	CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
	including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
	or business interruption, however caused and on any theory of liability, whether in contract, strict
	liability, or tort (including negligence), arising in any way out of the use of this software, even if
	advised of the possibility of such damage.

	5. CONTACT INFORMATION

	Fraunhofer Institute for Integrated Circuits IIS
	Attention: Audio and Multimedia Departments - FDK AAC LL
	Am Wolfsmantel 33
	91058 Erlangen, Germany

	www.iis.fraunhofer.de/amm
	amm-info@iis.fraunhofer.de
	----------------------------------------------------------------------------------------------------------- */

	/*************************** MPEG-4 AAC Decoder ************************

	Author(s): Josef Hoepfl
	Description: perceptual noise substitution tool

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

	#include "aacdec_pns.h"


	#include "aac_ram.h"
	#include "aac_rom.h"
	#include "channelinfo.h"
	#include "block.h"
	#include "FDK_bitstream.h"

	#include "genericStds.h"


	#define NOISE_OFFSET 90 /* cf. ISO 14496-3 p. 175 */

	/*!
	\brief Reset InterChannel and PNS data

	The function resets the InterChannel and PNS data
	*/
	void CPns_ResetData(
	CPnsData *pPnsData,
	CPnsInterChannelData *pPnsInterChannelData
	)
	{
	/* Assign pointer always, since pPnsData is not persistent data */
	pPnsData->pPnsInterChannelData = pPnsInterChannelData;
	pPnsData->PnsActive = 0;
	pPnsData->CurrentEnergy = 0;

	FDKmemclear(pPnsData->pnsUsed,(816)sizeof(UCHAR));
	FDKmemclear(pPnsInterChannelData->correlated,(816)sizeof(UCHAR));
	}

	/*!
	\brief Initialize PNS data

	The function initializes the PNS data
	*/
	void CPns_InitPns(
	CPnsData *pPnsData,
	CPnsInterChannelData *pPnsInterChannelData,
	INT* currentSeed, INT* randomSeed)
	{
	/* save pointer to inter channel data */
	pPnsData->pPnsInterChannelData = pPnsInterChannelData;

	/* use pointer because seed has to be
	same, left and right channel ! */
	pPnsData->currentSeed = currentSeed;
	pPnsData->randomSeed = randomSeed;
	}

	/*!
	\brief Indicates if PNS is used

	The function returns a value indicating whether PNS is used or not
	acordding to the noise energy

	\return PNS used
	*/
	int CPns_IsPnsUsed (const CPnsData *pPnsData,
	const int group,
	const int band)
	{
	unsigned pns_band = group*16+band;

	return pPnsData->pnsUsed[pns_band] & (UCHAR)1;
	}

	/*!
	\brief Set correlation

	The function activates the noise correlation between the channel pair
	*/
	void CPns_SetCorrelation(CPnsData *pPnsData,
	const int group,
	const int band,
	const int outofphase)
	{
	CPnsInterChannelData *pInterChannelData = pPnsData->pPnsInterChannelData;
	unsigned pns_band = group*16+band;

	pInterChannelData->correlated[pns_band] = (outofphase) ? 3 : 1;
	}

	/*!
	\brief Indicates if correlation is used

	The function indicates if the noise correlation between the channel pair
	is activated

	\return PNS is correlated
	*/
	static
	int CPns_IsCorrelated(const CPnsData *pPnsData,
	const int group,
	const int band)
	{
	CPnsInterChannelData *pInterChannelData = pPnsData->pPnsInterChannelData;
	unsigned pns_band = group*16+band;

	return (pInterChannelData->correlated[pns_band] & 0x01) ? 1 : 0;
	}

	/*!
	\brief Indicates if correlated out of phase mode is used.

	The function indicates if the noise correlation between the channel pair
	is activated in out-of-phase mode.

	\return PNS is out-of-phase
	*/
	static
	int CPns_IsOutOfPhase(const CPnsData *pPnsData,
	const int group,
	const int band)
	{
	CPnsInterChannelData *pInterChannelData = pPnsData->pPnsInterChannelData;
	unsigned pns_band = group*16+band;

	return (pInterChannelData->correlated[pns_band] & 0x02) ? 1 : 0;
	}

	/*!
	\brief Read PNS information

	The function reads the PNS information from the bitstream
	*/
	void CPns_Read (CPnsData *pPnsData,
	HANDLE_FDK_BITSTREAM bs,
	const CodeBookDescription *hcb,
	SHORT *pScaleFactor,
	UCHAR global_gain,
	int band,
	int group /* = 0 */)
	{
	int delta ;
	UINT pns_band = group*16+band;

	if (pPnsData->PnsActive) {
	/* Next PNS band case */
	delta = CBlock_DecodeHuffmanWord (bs, hcb) - 60;
	} else {
	/* First PNS band case */
	int noiseStartValue = FDKreadBits(bs,9);

	delta = noiseStartValue - 256 ;
	pPnsData->PnsActive = 1;
	pPnsData->CurrentEnergy = global_gain - NOISE_OFFSET;
	}

	pPnsData->CurrentEnergy += delta ;
	pScaleFactor[pns_band] = pPnsData->CurrentEnergy;

	pPnsData->pnsUsed[pns_band] = 1;
	}


	/**
	* \brief Generate a vector of noise of given length. The noise values are
	* scaled in order to yield a noise energy of 1.0
	* \param spec pointer to were the noise values will be written to.
	* \param size amount of noise values to be generated.
	* \param pRandomState pointer to the state of the random generator being used.
	* \return exponent of generated noise vector.
	*/
	static int GenerateRandomVector (FIXP_DBL *RESTRICT spec,
	int size,
	int *pRandomState)
	{
	int i, invNrg_e = 0, nrg_e = 0;
	FIXP_DBL invNrg_m, nrg_m = FL2FXCONST_DBL(0.0f) ;
	FIXP_DBL *RESTRICT ptr = spec;
	int randomState = *pRandomState;

	#define GEN_NOISE_NRG_SCALE 7

	/* Generate noise and calculate energy. */
	for (i=0; i<size; i++)
	{
	randomState = (1664525L * randomState) + 1013904223L; // Numerical Recipes
	nrg_m = fPow2AddDiv2(nrg_m, (FIXP_DBL)randomState>>GEN_NOISE_NRG_SCALE);
	*ptr++ = (FIXP_DBL)randomState;
	}
	nrg_e = GEN_NOISE_NRG_SCALE*2 + 1;

	/* weight noise with = 1 / sqrt_nrg; */
	invNrg_m = invSqrtNorm2(nrg_m<<1, &invNrg_e);
	invNrg_e += -((nrg_e-1)>>1);

	for (i=size; i--; )
	{
	spec[i] = fMult(spec[i], invNrg_m);
	}

	/* Store random state */
	*pRandomState = randomState;

	return invNrg_e;
	}

	static void ScaleBand (FIXP_DBL *RESTRICT spec, int size, int scaleFactor, int specScale, int noise_e, int out_of_phase)
	{
	int i, shift, sfExponent;
	FIXP_DBL sfMatissa;

	/* Get gain from scale factor value = 2^(scaleFactor * 0.25) */
	sfMatissa = MantissaTable[scaleFactor & 0x03][0];
	/* sfExponent = (scaleFactor >> 2) + ExponentTable[scaleFactor & 0x03][0]; */
	/* Note: ExponentTable[scaleFactor & 0x03][0] is always 1. */
	sfExponent = (scaleFactor >> 2) + 1;

	if (out_of_phase != 0) {
	sfMatissa = -sfMatissa;
	}

	/* +1 because of fMultDiv2 below. */
	shift = sfExponent - specScale + 1 + noise_e;

	/* Apply gain to noise values */
	if (shift>=0) {
	shift = fixMin( shift, DFRACT_BITS-1 );
	for (i = size ; i-- != 0; ) {
	spec [i] = fMultDiv2 (spec [i], sfMatissa) << shift;
	}
	} else {
	shift = fixMin( -shift, DFRACT_BITS-1 );
	for (i = size ; i-- != 0; ) {
	spec [i] = fMultDiv2 (spec [i], sfMatissa) >> shift;
	}
	}
	}


	/*!
	\brief Apply PNS

	The function applies PNS (i.e. it generates noise) on the bands
	flagged as noisy bands

	*/
	void CPns_Apply (const CPnsData *pPnsData,
	const CIcsInfo *pIcsInfo,
	SPECTRAL_PTR pSpectrum,
	const SHORT *pSpecScale,
	const SHORT *pScaleFactor,
	const SamplingRateInfo *pSamplingRateInfo,
	const INT granuleLength,
	const int channel)
	{
	if (pPnsData->PnsActive) {
	const short *BandOffsets = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo);

	int ScaleFactorBandsTransmitted = GetScaleFactorBandsTransmitted(pIcsInfo);

	for (int window = 0, group = 0; group < GetWindowGroups(pIcsInfo); group++) {
	for (int groupwin = 0; groupwin < GetWindowGroupLength(pIcsInfo, group); groupwin++, window++) {
	FIXP_DBL *spectrum = SPEC(pSpectrum, window, granuleLength);

	for (int band = 0 ; band < ScaleFactorBandsTransmitted; band++) {
	if (CPns_IsPnsUsed (pPnsData, group, band)) {
	UINT pns_band = group*16+band;

	int bandWidth = BandOffsets [band + 1] - BandOffsets [band] ;
	int noise_e;

	FDK_ASSERT(bandWidth >= 0);

	if (channel > 0 && CPns_IsCorrelated(pPnsData, group, band))
	{
	noise_e = GenerateRandomVector (spectrum + BandOffsets [band], bandWidth,
	&pPnsData->randomSeed [pns_band]) ;
	}
	else
	{
	pPnsData->randomSeed [pns_band] = *pPnsData->currentSeed ;

	noise_e = GenerateRandomVector (spectrum + BandOffsets [band], bandWidth,
	pPnsData->currentSeed) ;
	}

	int outOfPhase = CPns_IsOutOfPhase (pPnsData, group, band);

	ScaleBand (spectrum + BandOffsets [band], bandWidth,
	pScaleFactor[pns_band],
	pSpecScale[window], noise_e, outOfPhase) ;
	}
	}
	}
	}
	}
	}