xref: /external/aac/libAACenc/src/pnsparam.cpp

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

� Copyright  1995 - 2012 Fraunhofer-Gesellschaft zur F�rderung 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
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You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
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"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."

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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
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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
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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 Audio Encoder **************************

   Initial author:       M.Lohwasser
   contents/description: PNS parameters depending on bitrate and bandwidth

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

#include "pnsparam.h"
#include "psy_configuration.h"

typedef struct {
  SHORT     startFreq;
  /* Parameters for detection */
  FIXP_SGL  refPower;
  FIXP_SGL  refTonality;
  SHORT     tnsGainThreshold;     /* scaled by TNS_PREDGAIN_SCALE (=1000) */
  SHORT     tnsPNSGainThreshold;  /* scaled by TNS_PREDGAIN_SCALE (=1000) */
  FIXP_SGL  gapFillThr;
  SHORT     minSfbWidth;
  USHORT    detectionAlgorithmFlags;
} PNS_INFO_TAB;


typedef struct {
  ULONG brFrom;
  ULONG brTo;
  UCHAR S22050;
  UCHAR S24000;
  UCHAR S32000;
  UCHAR S44100;
  UCHAR S48000;
} AUTO_PNS_TAB;

static const AUTO_PNS_TAB levelTable_mono[]= {
  {0,      11999, 1, 1, 1, 1, 1,},
  {12000,  19999, 1, 1, 1, 1, 1,},
  {20000,  28999, 2, 1, 1, 1, 1,},
  {29000,  40999, 4, 4, 4, 2, 2,},
  {41000,  55999, 9, 9, 7, 7, 7,},
  {56000,  79999, 0, 0, 0, 9, 9,},
  {80000,  99999, 0, 0, 0, 0, 0,},
  {100000,999999, 0, 0, 0, 0, 0,},
};

static const AUTO_PNS_TAB levelTable_stereo[]= {
  {0,      11999, 1, 1, 1, 1, 1,},
  {12000,  19999, 3, 1, 1, 1, 1,},
  {20000,  28999, 3, 3, 3, 2, 2,},
  {29000,  40999, 7, 6, 6, 5, 5,},
  {41000,  55999, 9, 9, 7, 7, 7,},
  {56000,  79999, 0, 0, 0, 0, 0,},
  {80000,  99999, 0, 0, 0, 0, 0,},
  {100000,999999, 0, 0, 0, 0, 0,},
};


static const PNS_INFO_TAB pnsInfoTab[] = {
/*0   pns off */
/*1*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.06), 1150, 1200, FL2FXCONST_SGL(0.02), 8,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
/*2*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1130, 1300, FL2FXCONST_SGL(0.05), 8,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
/*3*/ { 4100, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1100, 1400, FL2FXCONST_SGL(0.10), 8,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
/*4*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
/*5*/ { 4300, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*6*/ { 5000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.25), 8,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*7*/ { 5500, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1100, 1400, FL2FXCONST_SGL(0.35), 8,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*8*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1080, 1400, FL2FXCONST_SGL(0.40), 8,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*9*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.14), 1070, 1400, FL2FXCONST_SGL(0.45), 8,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
};

static const AUTO_PNS_TAB levelTable_lowComplexity[]= {
  {0,      27999, 0, 0, 0, 0, 0,},
  {28000,  31999, 2, 2, 2, 2, 2,},
  {32000,  47999, 3, 3, 3, 3, 3,},
  {48000,  48000, 4, 4, 4, 4, 4,},
  {48001, 999999, 0, 0, 0, 0, 0,},
};

/* conversion of old LC tuning tables to new (LD enc) structure (only entries which are actually used were converted) */
static const PNS_INFO_TAB pnsInfoTab_lowComplexity[] = {
/*0   pns off */
      /* DEFAULT parameter set */
/*1*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.16), 1100, 1400, FL2FXCONST_SGL(0.5), 16,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*2*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*3*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.5), 16,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
      /* LOWSUBST -> PNS is used less often than with DEFAULT parameter set (for br: 48000 - 79999) */
/*4*/ { 4100, FL2FXCONST_SGL(0.20), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16,
        USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
};

/****************************************************************************
  function to look up used pns level
****************************************************************************/
int FDKaacEnc_lookUpPnsUse (int bitRate, int sampleRate, int numChan, const int isLC) {

  int hUsePns=0, size, i;
  const AUTO_PNS_TAB *levelTable;

  if (isLC) {
    levelTable = &levelTable_lowComplexity[0];
    size = sizeof(levelTable_lowComplexity);
  } else
  { /* (E)LD */
    levelTable = (numChan > 1) ? &levelTable_stereo[0] : &levelTable_mono[0];
    size = (numChan > 1) ? sizeof(levelTable_stereo) : sizeof(levelTable_mono);
  }

  for(i = 0; i < (int) (size/sizeof(AUTO_PNS_TAB)); i++) {
    if(((ULONG)bitRate >= levelTable[i].brFrom) &&
       ((ULONG)bitRate <= levelTable[i].brTo) )
      break;
  }

  /* sanity check */
  if ((int)(sizeof(pnsInfoTab)/sizeof(PNS_INFO_TAB)) < i ) {
    return (PNS_TABLE_ERROR);
  }

  switch (sampleRate) {
  case 22050: hUsePns = levelTable[i].S22050; break;
  case 24000: hUsePns = levelTable[i].S24000; break;
  case 32000: hUsePns = levelTable[i].S32000; break;
  case 44100: hUsePns = levelTable[i].S44100; break;
  case 48000: hUsePns = levelTable[i].S48000; break;
  default:
    if (isLC) {
      hUsePns = levelTable[i].S48000;
    }
    break;
  }

  return (hUsePns);
}


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

    functionname: FDKaacEnc_GetPnsParam
    description:  Gets PNS parameters depending on bitrate and bandwidth
    returns:      error status
    input:        Noiseparams struct, bitrate, sampling rate,
                  number of sfb's, pointer to sfb offset
    output:       PNS parameters

*****************************************************************************/
AAC_ENCODER_ERROR FDKaacEnc_GetPnsParam(NOISEPARAMS *np,
                                        INT         bitRate,
                                        INT         sampleRate,
                                        INT         sfbCnt,
                                        const INT   *sfbOffset,
                                        INT         *usePns,
                                        INT         numChan,
                                        const int   isLC)

{
    int i, hUsePns;
    const PNS_INFO_TAB *pnsInfo;

    if (isLC) {
      np->detectionAlgorithmFlags = IS_LOW_COMLEXITY;
      pnsInfo = pnsInfoTab_lowComplexity;
    }
    else
    {
      np->detectionAlgorithmFlags = 0;
      pnsInfo = pnsInfoTab;
    }

    if (*usePns<=0)
        return AAC_ENC_OK;

    /* new pns params */
    hUsePns = FDKaacEnc_lookUpPnsUse (bitRate, sampleRate, numChan, isLC);
    if (hUsePns == 0) {
      *usePns = 0;
        return AAC_ENC_OK;
        }
    if (hUsePns == PNS_TABLE_ERROR)
      return AAC_ENC_PNS_TABLE_ERROR;

    /* select correct row of tuning table */
    pnsInfo += hUsePns-1;

    np->startSfb = FDKaacEnc_FreqToBandWithRounding( pnsInfo->startFreq,
        sampleRate,
        sfbCnt,
        sfbOffset );

    np->detectionAlgorithmFlags |= pnsInfo->detectionAlgorithmFlags;

    np->refPower             = FX_SGL2FX_DBL(pnsInfo->refPower);
    np->refTonality          = FX_SGL2FX_DBL(pnsInfo->refTonality);
    np->tnsGainThreshold     = pnsInfo->tnsGainThreshold;
    np->tnsPNSGainThreshold  = pnsInfo->tnsPNSGainThreshold;
    np->minSfbWidth          = pnsInfo->minSfbWidth;

    np->gapFillThr           = (FIXP_SGL)pnsInfo->gapFillThr;

    /* assuming a constant dB/Hz slope in the signal's PSD curve,
    the detection threshold needs to be corrected for the width of the band */
    for ( i = 0; i < (sfbCnt-1); i++)
    {
        INT qtmp, sfbWidth;
        FIXP_DBL tmp;

        sfbWidth = sfbOffset[i+1]-sfbOffset[i];

        tmp = fPow(np->refPower, 0, sfbWidth, DFRACT_BITS-1-5, &qtmp);
        np->powDistPSDcurve[i] = (FIXP_SGL)((LONG)(scaleValue(tmp, qtmp) >> 16));
    }
    np->powDistPSDcurve[sfbCnt] = np->powDistPSDcurve[sfbCnt-1];

  return AAC_ENC_OK;
}