/* ----------------------------------------------------------------------------- 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 ----------------------------------------------------------------------------- */ /******************* Library for basic calculation routines ******************** Author(s): Markus Lohwasser Description: FDK Tools Decorrelator *******************************************************************************/ #ifndef FDK_DECORRELATE_H #define FDK_DECORRELATE_H #include "common_fix.h" #define FIXP_MPS FIXP_DBL #ifndef ARCH_PREFER_MULT_32x32 #define FIXP_DECORR FIXP_SGL #define FX_DECORR2FX_DBL FX_SGL2FX_DBL #define FX_DECORR2FX_SGL #define FX_DBL2FX_DECORR FX_DBL2FX_SGL #define FX_SGL2FX_DECORR #define DECORR(a) (FX_DBL2FXCONST_SGL(a)) #define FL2FXCONST_DECORR FL2FXCONST_SGL #else #define FIXP_DECORR FIXP_DBL #define FX_DECORR2FX_DBL #define FX_DECORR2FX_SGL FX_DBL2FX_SGL #define FX_DBL2FX_DECORR #define FX_SGL2FX_DECORR FX_SGL2FX_DBL #define DECORR(a) FIXP_DBL(a) #define FL2FXCONST_DECORR FL2FXCONST_DBL #endif /*--------------- enums -------------------------------*/ /** * Decorrelator types. */ typedef enum { DECORR_MPS, /**< Decorrelator type used by MPS LP/HQ */ DECORR_PS, /**< Decorrelator type used by HEAACv2 and MPS LP */ DECORR_USAC, /**< Decorrelator type used by USAC */ DECORR_LD /**< Decorrelator type used by MPS Low Delay */ } FDK_DECORR_TYPE; /** * Ducker types. */ typedef enum { DUCKER_AUTOMATIC, /**< FDKdecorrelateInit() chooses correct ducker type depending on provided parameters. */ DUCKER_MPS, /**< Force ducker type to MPS. */ DUCKER_PS /**< Force ducker type to PS. */ } FDK_DUCKER_TYPE; /** * Reverb band types. */ typedef enum { NOT_EXIST, /**< Mark reverb band as non-existing (number of bands = 0). */ DELAY, /**< Reverb bands just contains delay elements and no allpass filters. */ COMMON_REAL, /**< Real filter coeffs, common filter coeffs within one reverb band */ COMMON_CPLX, /**< Complex filter coeffs, common filter coeffs within one reverb band */ INDEP_CPLX, /**< Complex filter coeffs, independent filter coeffs for each hybrid band */ INDEP_CPLX_PS /**< PS optimized implementation of general INDEP_CPLX type */ } REVBAND_FILT_TYPE; typedef struct DECORR_DEC *HANDLE_DECORR_DEC; typedef struct DUCKER_INSTANCE { int hybridBands; int parameterBands; int partiallyComplex; FDK_DUCKER_TYPE duckerType; const UCHAR *qs_next; const UCHAR *mapProcBands2HybBands; const UCHAR *mapHybBands2ProcBands; /* interleaved SmoothDirectNrg[] and SmoothReverbNrg[], non-interleaved SmoothDirectNrg[] in case of parametric stereo */ FIXP_MPS SmoothDirRevNrg[2 * (28)]; /* parametric stereo */ FIXP_MPS peakDecay[(28)]; FIXP_MPS peakDiff[(28)]; FIXP_DBL maxValDirectData; FIXP_DBL maxValReverbData; SCHAR scaleDirectNrg; SCHAR scaleReverbNrg; SCHAR scaleSmoothDirRevNrg; SCHAR headroomSmoothDirRevNrg; } DUCKER_INSTANCE; typedef struct DECORR_FILTER_INSTANCE { FIXP_MPS *stateCplx; FIXP_DBL *DelayBufferCplx; const FIXP_DECORR *numeratorReal; const FIXP_STP *coeffsPacked; const FIXP_DECORR *denominatorReal; } DECORR_FILTER_INSTANCE; typedef struct DECORR_DEC { INT L_stateBufferCplx; FIXP_DBL *stateBufferCplx; INT L_delayBufferCplx; FIXP_DBL *delayBufferCplx; const REVBAND_FILT_TYPE *REV_filtType; const UCHAR *REV_bandOffset; const UCHAR *REV_delay; const SCHAR *REV_filterOrder; INT reverbBandDelayBufferIndex[(4)]; UCHAR stateBufferOffset[(3)]; DECORR_FILTER_INSTANCE Filter[(71)]; DUCKER_INSTANCE ducker; int numbins; int partiallyComplex; } DECORR_DEC; /** * \brief Create one instance of Decorrelator. * * \param hDecorrDec A pointer to a decorrelator instance which was * allocated externally. * \param bufferCplx Externally allocated buffer (allocate (2*( ( 825 ) * + ( 373 ) )) FIXP_DBL values). * \param bufLen Length of bufferCplx. Must be >= (2*( ( 825 ) + ( * 373 ) )). * * \return 0 on success. */ INT FDKdecorrelateOpen(HANDLE_DECORR_DEC hDecorrDec, FIXP_DBL *bufferCplx, const INT bufLen); /** * \brief Initialize and configure Decorrelator instance. * * \param hDecorrDec A Decorrelator handle. * \param nrHybBands Number of (hybrid) bands. * \param decorrType Decorrelator type to use. * \param duckerType Ducker type to use (in general use * DUCKER_AUTOMATIC). * \param decorrConfig Depending on decorrType values of 0,1,2 are * allowed. * \param seed Seed of decorrelator instance. Allowed maximum * valued depends on decorrType. * \param partiallyComplex Low power or high quality processing 0: HQ, 1: LQ * (only allowed for DECORR_MPS | DECORR_PS). * \param useFractDelay Indicate usage of fractional delay 0: off, 1: on * (currently not supported). * \param isLegacyPS Indicate if DECORR_PS is used for HEAACv2 (for all * other cases: isLegacyPS = 0). The purpose of this parameter is to select the * correct number of param bands for the ducker. * \param initStatesFlag Indicates whether the states buffer has to be * cleared. * * \return 0 on success. */ INT FDKdecorrelateInit(HANDLE_DECORR_DEC hDecorrDec, const INT nrHybBands, const FDK_DECORR_TYPE decorrType, const FDK_DUCKER_TYPE duckerType, const INT decorrConfig, const INT seed, const INT partiallyComplex, const INT useFractDelay, const INT isLegacyPS, const INT initStatesFlag); /** * \brief Apply Decorrelator on input data. * * Function applies decorrelator and ducker inplace on hybrid input data. * Modified hybrid data will be returned inplace. * * \param hDecorrDec A decorrelator handle. * \param dataRealIn In (hybrid) data. * \param dataImagIn In (hybrid) data. * \param dataRealOut Out (hybrid) data (can be same as dataRealIn for * in-place calculation). * \param dataImagOut Out (hybrid) data (can be same as dataImagIn for * in-place calculation). * \param startHybBand Hybrid band to start with decorrelation. * * \return 0 on success. */ INT FDKdecorrelateApply(HANDLE_DECORR_DEC hDecorrDec, FIXP_DBL *dataRealIn, FIXP_DBL *dataImagIn, FIXP_DBL *dataRealOut, FIXP_DBL *dataImagOut, const INT startHybBand); /** * \brief Destroy a Decorrelator instance. * * Deallocate whole memory of decorraltor and inside ducker. * * \param hDecorrDec Pointer to a decoderrolator handle. Null initialized on * return. * * \return 0 on success. */ INT FDKdecorrelateClose(HANDLE_DECORR_DEC hDecorrDec); /** * \brief Get max value address of direct signal. * * Get max value address of direct signal needed for ducker energy calculation. * * \param hDecorrDec Pointer to a decoderrolator handle. * * \return address of max value */ FIXP_DBL *getAddrDirectSignalMaxVal(HANDLE_DECORR_DEC hDecorrDec); #endif /* FDK_DECORRELATE_H */