| /* ----------------------------------------------------------------------------- |
| 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 */ |