xref: /aosp_15_r20/external/aac/libSACenc/src/sacenc_staticgain.cpp (revision e54365361535b070c2db7374cec45c159c7d0e7a)

/* -----------------------------------------------------------------------------
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
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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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
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information and documentation.

2.    COPYRIGHT LICENSE

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are permitted without payment of copyright license fees provided that you
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Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
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www.iis.fraunhofer.de/amm
[email protected]
----------------------------------------------------------------------------- */

/*********************** 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;
}