fdk-aac/libSBRenc/src/invf_est.h

/* -----------------------------------------------------------------------------
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
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charge copies of the complete source code of the FDK AAC Codec and your
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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You may use this FDK AAC Codec software or modifications thereto only for
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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,
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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
----------------------------------------------------------------------------- */

/**************************** SBR encoder library ******************************

   Author(s):

   Description:

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

/*!
  \file
  \brief  Inverse Filtering detection prototypes $Revision: 92790 $
*/
#ifndef INVF_EST_H
#define INVF_EST_H

#include "sbr_encoder.h"
#include "sbr_def.h"

#define INVF_SMOOTHING_LENGTH 2

typedef struct {
  const FIXP_DBL *quantStepsSbr;
  const FIXP_DBL *quantStepsOrig;
  const FIXP_DBL *nrgBorders;
  INT numRegionsSbr;
  INT numRegionsOrig;
  INT numRegionsNrg;
  INVF_MODE regionSpace[5][5];
  INVF_MODE regionSpaceTransient[5][5];
  INT EnergyCompFactor[5];

} DETECTOR_PARAMETERS;

typedef struct {
  FIXP_DBL origQuotaMean[INVF_SMOOTHING_LENGTH + 1];
  FIXP_DBL sbrQuotaMean[INVF_SMOOTHING_LENGTH + 1];
  FIXP_DBL origQuotaMeanStrongest[INVF_SMOOTHING_LENGTH + 1];
  FIXP_DBL sbrQuotaMeanStrongest[INVF_SMOOTHING_LENGTH + 1];

  FIXP_DBL origQuotaMeanFilt;
  FIXP_DBL sbrQuotaMeanFilt;
  FIXP_DBL origQuotaMeanStrongestFilt;
  FIXP_DBL sbrQuotaMeanStrongestFilt;

  FIXP_DBL origQuotaMax;
  FIXP_DBL sbrQuotaMax;

  FIXP_DBL avgNrg;
} DETECTOR_VALUES;

typedef struct {
  INT numberOfStrongest;

  INT prevRegionSbr[MAX_NUM_NOISE_VALUES];
  INT prevRegionOrig[MAX_NUM_NOISE_VALUES];

  INT freqBandTableInvFilt[MAX_NUM_NOISE_VALUES];
  INT noDetectorBands;
  INT noDetectorBandsMax;

  const DETECTOR_PARAMETERS *detectorParams;

  INVF_MODE prevInvfMode[MAX_NUM_NOISE_VALUES];
  DETECTOR_VALUES detectorValues[MAX_NUM_NOISE_VALUES];

  FIXP_DBL nrgAvg;
  FIXP_DBL wmQmf[MAX_NUM_NOISE_VALUES];
} SBR_INV_FILT_EST;

typedef SBR_INV_FILT_EST *HANDLE_SBR_INV_FILT_EST;

void FDKsbrEnc_qmfInverseFilteringDetector(HANDLE_SBR_INV_FILT_EST hInvFilt,
                                           FIXP_DBL **quotaMatrix,
                                           FIXP_DBL *nrgVector,
                                           SCHAR *indexVector, INT startIndex,
                                           INT stopIndex, INT transientFlag,
                                           INVF_MODE *infVec);

INT FDKsbrEnc_initInvFiltDetector(HANDLE_SBR_INV_FILT_EST hInvFilt,
                                  INT *freqBandTableDetector,
                                  INT numDetectorBands, UINT useSpeechConfig);

INT FDKsbrEnc_resetInvFiltDetector(HANDLE_SBR_INV_FILT_EST hInvFilt,
                                   INT *freqBandTableDetector,
                                   INT numDetectorBands);

#endif /* _QMF_INV_FILT_H */