xref: /aosp_15_r20/external/aac/libSBRenc/src/ps_encode.h (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
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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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
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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
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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
[email protected]
----------------------------------------------------------------------------- */

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

   Author(s):   M. Neuendorf, N. Rettelbach, M. Multrus

   Description: PS Parameter extraction, encoding

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

/*!
  \file
  \brief  PS parameter extraction, encoding functions $Revision: 92790 $
*/

#ifndef PS_ENCODE_H
#define PS_ENCODE_H

#include "ps_const.h"
#include "ps_bitenc.h"

#define IID_SCALE_FT (64.f) /* maxVal in Quant tab is +/- 50 */
#define IID_SCALE 6         /* maxVal in Quant tab is +/- 50 */
#define IID_MAXVAL (1 << IID_SCALE)

#define PS_QUANT_SCALE_FT \
  (64.f) /* error smaller (64-25)/64 * 20 bands * 4 env -> QuantScale 64 */
#define PS_QUANT_SCALE \
  6 /* error smaller (64-25)/64 * 20 bands * 4 env -> QuantScale 6 bit */

#define QMF_GROUPS_LO_RES 12
#define SUBQMF_GROUPS_LO_RES 10
#define QMF_GROUPS_HI_RES 18
#define SUBQMF_GROUPS_HI_RES 30

typedef struct T_PS_DATA {
  INT iidEnable;
  INT iidEnableLast;
  INT iidQuantMode;
  INT iidQuantModeLast;
  INT iidDiffMode[PS_MAX_ENVELOPES];
  INT iidIdx[PS_MAX_ENVELOPES][PS_MAX_BANDS];
  INT iidIdxLast[PS_MAX_BANDS];

  INT iccEnable;
  INT iccEnableLast;
  INT iccQuantMode;
  INT iccQuantModeLast;
  INT iccDiffMode[PS_MAX_ENVELOPES];
  INT iccIdx[PS_MAX_ENVELOPES][PS_MAX_BANDS];
  INT iccIdxLast[PS_MAX_BANDS];

  INT nEnvelopesLast;

  INT headerCnt;
  INT iidTimeCnt;
  INT iccTimeCnt;
  INT noEnvCnt;

} PS_DATA, *HANDLE_PS_DATA;

typedef struct T_PS_ENCODE {
  PS_DATA psData;

  PS_BANDS psEncMode;
  INT nQmfIidGroups;
  INT nSubQmfIidGroups;
  INT iidGroupBorders[QMF_GROUPS_HI_RES + SUBQMF_GROUPS_HI_RES + 1];
  INT subband2parameterIndex[QMF_GROUPS_HI_RES + SUBQMF_GROUPS_HI_RES];
  UCHAR iidGroupWidthLd[QMF_GROUPS_HI_RES + SUBQMF_GROUPS_HI_RES];
  FIXP_DBL iidQuantErrorThreshold;

  UCHAR psBandNrgScale[PS_MAX_BANDS];

} PS_ENCODE;

typedef struct T_PS_ENCODE *HANDLE_PS_ENCODE;

FDK_PSENC_ERROR FDKsbrEnc_CreatePSEncode(HANDLE_PS_ENCODE *phPsEncode);

FDK_PSENC_ERROR FDKsbrEnc_InitPSEncode(HANDLE_PS_ENCODE hPsEncode,
                                       const PS_BANDS psEncMode,
                                       const FIXP_DBL iidQuantErrorThreshold);

FDK_PSENC_ERROR FDKsbrEnc_DestroyPSEncode(HANDLE_PS_ENCODE *phPsEncode);

FDK_PSENC_ERROR FDKsbrEnc_PSEncode(
    HANDLE_PS_ENCODE hPsEncode, HANDLE_PS_OUT hPsOut, UCHAR *dynBandScale,
    UINT maxEnvelopes,
    FIXP_DBL *hybridData[HYBRID_FRAMESIZE][MAX_PS_CHANNELS][2],
    const INT frameSize, const INT sendHeader);

#endif