/* -----------------------------------------------------------------------------

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

----------------------------------------------------------------------------- */

/**************************** AAC encoder library ******************************

   Author(s):   M.Lohwasser

   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 S16000;

  UCHAR S22050;

  UCHAR S24000;

  UCHAR S32000;

  UCHAR S44100;

  UCHAR S48000;

} AUTO_PNS_TAB;

static const AUTO_PNS_TAB levelTable_mono[] = {

    {

        0,

        11999,

        0,

        1,

        1,

        1,

        1,

        1,

    },

    {

        12000,

        19999,

        0,

        1,

        1,

        1,

        1,

        1,

    },

    {

        20000,

        28999,

        0,

        2,

        1,

        1,

        1,

        1,

    },

    {

        29000,

        40999,

        0,

        4,

        4,

        4,

        2,

        2,

    },

    {

        41000,

        55999,

        0,

        9,

        9,

        7,

        7,

        7,

    },

    {

        56000,

        61999,

        0,

        0,

        0,

        0,

        9,

        9,

    },

    {

        62000,

        75999,

        0,

        0,

        0,

        0,

        0,

        0,

    },

    {

        76000,

        92999,

        0,

        0,

        0,

        0,

        0,

        0,

    },

    {

        93000,

        999999,

        0,

        0,

        0,

        0,

        0,

        0,

    },

};

static const AUTO_PNS_TAB levelTable_stereo[] = {

    {

        0,

        11999,

        0,

        1,

        1,

        1,

        1,

        1,

    },

    {

        12000,

        19999,

        0,

        3,

        1,

        1,

        1,

        1,

    },

    {

        20000,

        28999,

        0,

        3,

        3,

        3,

        2,

        2,

    },

    {

        29000,

        40999,

        0,

        7,

        6,

        6,

        5,

        5,

    },

    {

        41000,

        55999,

        0,

        9,

        9,

        7,

        7,

        7,

    },

    {

        56000,

        79999,

        0,

        0,

        0,

        0,

        0,

        0,

    },

    {

        80000,

        99999,

        0,

        0,

        0,

        0,

        0,

        0,

    },

    {

        100000,

        999999,

        0,

        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,

        0,

    },

    {

        28000,

        31999,

        0,

        2,

        2,

        2,

        2,

        2,

    },

    {

        32000,

        47999,

        0,

        3,

        3,

        3,

        3,

        3,

    },

    {

        48000,

        48000,

        0,

        4,

        4,

        4,

        4,

        4,

    },

    {

        48001,

        999999,

        0,

        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 16000:

      hUsePns = levelTable[i].S16000;

      break;

    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 or

                    bitsPerLine

    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 (*usePns <= 0) return AAC_ENC_OK;

  if (isLC) {

    np->detectionAlgorithmFlags = IS_LOW_COMPLEXITY;

    pnsInfo = pnsInfoTab_lowComplexity;

    /* 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;

  } else {

    np->detectionAlgorithmFlags = 0;

    pnsInfo = pnsInfoTab;

    /* 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_FreqToBandWidthRounding(

      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 =

      pnsInfo->gapFillThr; /* for LC it is always FL2FXCONST_SGL(0.5) */

  /* 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;

}