libSACenc/src/sacenc_staticgain.cpp

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

/*********************** MPEG surround encoder library *************************

   Author(s):   Christian Goettlinger

   Description: Encoder Library Interface
                gain management of the encoder

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

/*****************************************************************************
\file
This file contains all static gain infrastructure
******************************************************************************/

/* Includes ******************************************************************/
#include "sacenc_staticgain.h"

/* Defines *******************************************************************/
#define MP4SPACEENC_DMX_GAIN_DEFAULT SACENC_DMXGAIN_3_dB
#define GAINCF_SF (4)
#define GAINCT1(x) FL2FXCONST_DBL(x)
#define GAINCF(x) FL2FXCONST_DBL(x)

#define GAINCT2(x) FL2FXCONST_DBL(x)
#define FX_DBL2FX_GAIN(x) (x)

/* Data Types ****************************************************************/
struct STATIC_GAIN {
  /* External Config Values */
  MP4SPACEENC_MODE encMode;
  MP4SPACEENC_DMX_GAIN fixedGainDMX;
  INT preGainFactorDb;

  /* Internal Values */
  FIXP_GAIN PostGain__FDK;
  FIXP_GAIN pPreGain__FDK[SACENC_MAX_INPUT_CHANNELS];
};

/* Constants *****************************************************************/
/*
   preGainFactorTable:

   pre calculation: (float)pow(10.f,(((float) x)/20.f))/(float)(1<<GAINCF_SF), x
   = -20 ... +20
*/
static const FIXP_DBL preGainFactorTable__FDK[41] = {
    GAINCF(6.2500000931e-003), GAINCF(7.0126154460e-003),
    GAINCF(7.8682834283e-003), GAINCF(8.8283596560e-003),
    GAINCF(9.9055822939e-003), GAINCF(1.1114246212e-002),
    GAINCF(1.2470389716e-002), GAINCF(1.3992006890e-002),
    GAINCF(1.5699289739e-002), GAINCF(1.7614893615e-002),
    GAINCF(1.9764235243e-002), GAINCF(2.2175837308e-002),
    GAINCF(2.4881698191e-002), GAINCF(2.7917724103e-002),
    GAINCF(3.1324200332e-002), GAINCF(3.5146333277e-002),
    GAINCF(3.9434835315e-002), GAINCF(4.4246610254e-002),
    GAINCF(4.9645513296e-002), GAINCF(5.5703181773e-002),
    GAINCF(6.2500000000e-002), GAINCF(7.0126153529e-002),
    GAINCF(7.8682839870e-002), GAINCF(8.8283598423e-002),
    GAINCF(9.9055826664e-002), GAINCF(1.1114246398e-001),
    GAINCF(1.2470389158e-001), GAINCF(1.3992007077e-001),
    GAINCF(1.5699289739e-001), GAINCF(1.7614893615e-001),
    GAINCF(1.9764235616e-001), GAINCF(2.2175836563e-001),
    GAINCF(2.4881698191e-001), GAINCF(2.7917724848e-001),
    GAINCF(3.1324201822e-001), GAINCF(3.5146331787e-001),
    GAINCF(3.9434835315e-001), GAINCF(4.4246610999e-001),
    GAINCF(4.9645513296e-001), GAINCF(5.5703181028e-001),
    GAINCF(6.2500000000e-001)};

static const FIXP_GAIN dmxGainTable__FDK[] = {
    /* GAINCT2(1.0), */ GAINCT2(0.84089650f),
    GAINCT2(0.70710706f),
    GAINCT2(0.59460385f),
    GAINCT2(0.50000000f),
    GAINCT2(0.42044825f),
    GAINCT2(0.35355341f),
    GAINCT2(0.25000000f)};

/* Function / Class Declarations *********************************************/

/* Function / Class Definition ***********************************************/

/*-----------------------------------------------------------------------------
functionname: fdk_sacenc_staticGain_OpenConfig()
description:  opens and sets ConfigStruct to Default Values
returns:      noError on success, an apropriate error code else
-----------------------------------------------------------------------------*/
FDK_SACENC_ERROR fdk_sacenc_staticGain_OpenConfig(
    HANDLE_STATIC_GAIN_CONFIG *phStaticGainConfig) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == phStaticGainConfig) {
    error = SACENC_INVALID_HANDLE;
  } else {
    /* Allocate Instance */
    FDK_ALLOCATE_MEMORY_1D(*phStaticGainConfig, 1, struct STATIC_GAIN_CONFIG);
  }
  return error;

bail:
  fdk_sacenc_staticGain_CloseConfig(phStaticGainConfig);
  return ((SACENC_OK == error) ? SACENC_MEMORY_ERROR : error);
}

FDK_SACENC_ERROR fdk_sacenc_staticGain_InitDefaultConfig(
    HANDLE_STATIC_GAIN_CONFIG hStaticGainConfig) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == hStaticGainConfig) {
    error = SACENC_INVALID_HANDLE;
  } else {
    /* Necessary Input Variables */
    hStaticGainConfig->encMode = SACENC_INVALID_MODE;

    /* Optional Configs Set to Default Values */
    hStaticGainConfig->fixedGainDMX = MP4SPACEENC_DMX_GAIN_DEFAULT;
    hStaticGainConfig->preGainFactorDb = 0;
  }
  return error;
}

/*-----------------------------------------------------------------------------
functionname: fdk_sacenc_staticGain_CloseConfig()
description:  destructs Static Gain Config Structure
returns:      noError on success, an apropriate error code else
-----------------------------------------------------------------------------*/
FDK_SACENC_ERROR fdk_sacenc_staticGain_CloseConfig(
    HANDLE_STATIC_GAIN_CONFIG *phStaticGainConfig) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if ((phStaticGainConfig == NULL) || (*phStaticGainConfig == NULL)) {
    error = SACENC_INVALID_HANDLE;
  } else {
    FDKfree(*phStaticGainConfig);
    *phStaticGainConfig = NULL;
  }
  return error;
}

/*-----------------------------------------------------------------------------
functionname: fdk_sacenc_staticGain_Open()
description:  initializes Static Gains
returns:      noError on success, an apropriate error code else
-----------------------------------------------------------------------------*/
FDK_SACENC_ERROR fdk_sacenc_staticGain_Open(HANDLE_STATIC_GAIN *phStaticGain) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == phStaticGain) {
    error = SACENC_INVALID_HANDLE;
  } else {
    /* Allocate Instance */
    FDK_ALLOCATE_MEMORY_1D(*phStaticGain, 1, struct STATIC_GAIN);
  }
  return error;

bail:
  return ((SACENC_OK == error) ? SACENC_MEMORY_ERROR : error);
}

FDK_SACENC_ERROR fdk_sacenc_staticGain_Init(
    HANDLE_STATIC_GAIN hStaticGain,
    const HANDLE_STATIC_GAIN_CONFIG hStaticGainConfig, INT *const scale) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if ((hStaticGain == NULL) || (hStaticGainConfig == NULL)) {
    error = SACENC_INVALID_HANDLE;
  } else {
    hStaticGain->encMode = hStaticGainConfig->encMode;
    hStaticGain->fixedGainDMX = hStaticGainConfig->fixedGainDMX;
    hStaticGain->preGainFactorDb = hStaticGainConfig->preGainFactorDb;

    if ((hStaticGain->preGainFactorDb < -20) ||
        (hStaticGain->preGainFactorDb > 20)) {
      error = SACENC_INVALID_CONFIG;
      goto bail;
    }

    FIXP_DBL fPreGainFactor__FDK;

    if (hStaticGain->preGainFactorDb == 0) {
      fPreGainFactor__FDK = (FIXP_DBL)MAXVAL_DBL;
      *scale = 0;
    } else {
      int s;
      fPreGainFactor__FDK =
          preGainFactorTable__FDK[hStaticGain->preGainFactorDb + 20];
      s = fixMax(0, CntLeadingZeros(fPreGainFactor__FDK) - 1);
      fPreGainFactor__FDK = fPreGainFactor__FDK << (s);
      *scale = GAINCF_SF - s;
    }

    if (hStaticGain->fixedGainDMX == 0)
      hStaticGain->PostGain__FDK = MAXVAL_GAIN;
    else
      hStaticGain->PostGain__FDK =
          dmxGainTable__FDK[hStaticGain->fixedGainDMX - 1];

    FDKmemclear(
        hStaticGain->pPreGain__FDK,
        sizeof(hStaticGain->pPreGain__FDK)); /* zero all input channels */

    /* Configure PreGain-Vector */
    if (hStaticGain->encMode == SACENC_212) {
      hStaticGain->pPreGain__FDK[0] =
          FX_DBL2FX_GAIN(fPreGainFactor__FDK); /* L */
      hStaticGain->pPreGain__FDK[1] =
          FX_DBL2FX_GAIN(fPreGainFactor__FDK); /* R */
    } else {
      error = SACENC_INVALID_CONFIG;
    }

  } /* valid handle */

bail:

  return error;
}

/*-----------------------------------------------------------------------------
functionname: fdk_sacenc_staticGain_Close()
description:  destructs Static Gains
returns:      noError on success, an apropriate error code else
-----------------------------------------------------------------------------*/
FDK_SACENC_ERROR fdk_sacenc_staticGain_Close(HANDLE_STATIC_GAIN *phStaticGain) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if ((phStaticGain == NULL) || (*phStaticGain == NULL)) {
    error = SACENC_INVALID_HANDLE;
  } else {
    FDKfree(*phStaticGain);
    *phStaticGain = NULL;
  }
  return error;
}

/*-----------------------------------------------------------------------------
functionname: fdk_sacenc_staticPostGain_Apply
description:  multiply the Output samples with the PostGain
returns:      noError on success, an apropriate error code else
-----------------------------------------------------------------------------*/
FDK_SACENC_ERROR fdk_sacenc_staticPostGain_ApplyFDK(
    const HANDLE_STATIC_GAIN hStaticGain, INT_PCM *const pOutputSamples,
    const INT nOutputSamples, const INT scale) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == hStaticGain) {
    error = SACENC_INVALID_HANDLE;
  } else {
    int i;
    FIXP_GAIN postGain = hStaticGain->PostGain__FDK;

    if (scale < 0) {
      if (postGain == MAXVAL_GAIN) {
        for (i = 0; i < nOutputSamples; i++) {
          pOutputSamples[i] = pOutputSamples[i] >> (-scale);
        }
      } else {
        for (i = 0; i < nOutputSamples; i++) {
          pOutputSamples[i] = FX_DBL2FX_PCM(
              fMult(postGain, FX_PCM2FX_DBL(pOutputSamples[i])) >> (-scale));
        }
      }
    } else {
      if (postGain == MAXVAL_GAIN) {
        for (i = 0; i < nOutputSamples; i++) {
          pOutputSamples[i] = FX_DBL2FX_PCM(SATURATE_LEFT_SHIFT(
              FX_PCM2FX_DBL(pOutputSamples[i]), scale, DFRACT_BITS));
        }
      } else {
        for (i = 0; i < nOutputSamples; i++) {
          pOutputSamples[i] = FX_DBL2FX_PCM(SATURATE_LEFT_SHIFT(
              fMult(postGain, FX_PCM2FX_DBL(pOutputSamples[i])), scale,
              DFRACT_BITS));
        }
      }
    }
  }
  return error;
}

/*-----------------------------------------------------------------------------
functionname: fdk_sacenc_getPreGainPtr()/ fdk_sacenc_getPostGain()
description:  get Gain-Pointers from struct
returns:      Pointer to PreGain or postGain
-----------------------------------------------------------------------------*/
FIXP_GAIN *fdk_sacenc_getPreGainPtrFDK(HANDLE_STATIC_GAIN hStaticGain) {
  return ((hStaticGain == NULL) ? NULL : hStaticGain->pPreGain__FDK);
}

FIXP_GAIN fdk_sacenc_getPostGainFDK(HANDLE_STATIC_GAIN hStaticGain) {
  return (hStaticGain->PostGain__FDK);
}

/* get fixed downmix gain and map it to bitstream enum */
FIXEDGAINDMXCONFIG fdk_sacenc_staticGain_GetDmxGain(
    const HANDLE_STATIC_GAIN hStaticGain) {
  FIXEDGAINDMXCONFIG dmxGain = FIXEDGAINDMX_INVALID;

  switch (hStaticGain->fixedGainDMX) {
    case 0:
      dmxGain = FIXEDGAINDMX_0;
      break;
    case 1:
      dmxGain = FIXEDGAINDMX_1;
      break;
    case 2:
      dmxGain = FIXEDGAINDMX_2;
      break;
    case 3:
      dmxGain = FIXEDGAINDMX_3;
      break;
    case 4:
      dmxGain = FIXEDGAINDMX_4;
      break;
    case 5:
      dmxGain = FIXEDGAINDMX_5;
      break;
    case 6:
      dmxGain = FIXEDGAINDMX_6;
      break;
    case 7:
      dmxGain = FIXEDGAINDMX_7;
      break;
    default:
      dmxGain = FIXEDGAINDMX_INVALID;
  }
  return dmxGain;
}

FDK_SACENC_ERROR fdk_sacenc_staticGain_SetDmxGain(
    HANDLE_STATIC_GAIN_CONFIG hStaticGainCfg,
    const MP4SPACEENC_DMX_GAIN dmxGain) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == hStaticGainCfg) {
    error = SACENC_INVALID_HANDLE;
  } else {
    hStaticGainCfg->fixedGainDMX = dmxGain;
  }
  return error;
}

FDK_SACENC_ERROR fdk_sacenc_staticGain_SetEncMode(
    HANDLE_STATIC_GAIN_CONFIG hStaticGainCfg, const MP4SPACEENC_MODE encMode) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == hStaticGainCfg) {
    error = SACENC_INVALID_HANDLE;
  } else {
    hStaticGainCfg->encMode = encMode;
  }
  return error;
}