| /* ----------------------------------------------------------------------------- |
| 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 Hybrid Filterbank |
| |
| *******************************************************************************/ |
| |
| #ifndef FDK_HYBRID_H |
| #define FDK_HYBRID_H |
| |
| #include "common_fix.h" |
| |
| /*--------------- enums -------------------------------*/ |
| |
| /** |
| * Hybrid Filterband modes. |
| */ |
| typedef enum { |
| THREE_TO_TEN, |
| THREE_TO_TWELVE, |
| THREE_TO_SIXTEEN |
| |
| } FDK_HYBRID_MODE; |
| |
| /*--------------- structure definitions ---------------*/ |
| typedef const struct FDK_HYBRID_SETUP *HANDLE_FDK_HYBRID_SETUP; |
| |
| typedef struct { |
| FIXP_DBL *bufferLFReal[3]; /*!< LF real filter states. */ |
| FIXP_DBL *bufferLFImag[3]; /*!< LF imag filter states. */ |
| FIXP_DBL *bufferHFReal[13]; /*!< HF real delay lines. */ |
| FIXP_DBL *bufferHFImag[13]; /*!< HF imag delay lines. */ |
| |
| INT bufferLFpos; /*!< Position to write incoming data into ringbuffer. */ |
| INT bufferHFpos; /*!< Delay line positioning. */ |
| INT nrBands; /*!< Number of QMF bands. */ |
| INT cplxBands; /*!< Number of complex QMF bands.*/ |
| UCHAR hfMode; /*!< Flag signalizes treatment of HF bands. */ |
| |
| FIXP_DBL *pLFmemory; /*!< Pointer to LF states buffer. */ |
| FIXP_DBL *pHFmemory; /*!< Pointer to HF states buffer. */ |
| |
| UINT LFmemorySize; /*!< Size of LF states buffer. */ |
| UINT HFmemorySize; /*!< Size of HF states buffer. */ |
| |
| HANDLE_FDK_HYBRID_SETUP pSetup; /*!< Pointer to filter setup. */ |
| |
| } FDK_ANA_HYB_FILTER; |
| |
| typedef struct { |
| INT nrBands; /*!< Number of QMF bands. */ |
| INT cplxBands; /*!< Number of complex QMF bands.*/ |
| |
| HANDLE_FDK_HYBRID_SETUP pSetup; /*!< Pointer to filter setup. */ |
| |
| } FDK_SYN_HYB_FILTER; |
| |
| typedef FDK_ANA_HYB_FILTER *HANDLE_FDK_ANA_HYB_FILTER; |
| typedef FDK_SYN_HYB_FILTER *HANDLE_FDK_SYN_HYB_FILTER; |
| |
| /** |
| * \brief Create one instance of Hybrid Analyis Filterbank. |
| * |
| * \param hAnalysisHybFilter Pointer to an outlying allocated Hybrid Analysis |
| * Filterbank structure. |
| * \param pLFmemory Pointer to outlying buffer used LF filtering. |
| * \param LFmemorySize Size of pLFmemory in bytes. |
| * \param pHFmemory Pointer to outlying buffer used HF delay line. |
| * \param HFmemorySize Size of pLFmemory in bytes. |
| * |
| * \return 0 on success. |
| */ |
| INT FDKhybridAnalysisOpen(HANDLE_FDK_ANA_HYB_FILTER hAnalysisHybFilter, |
| FIXP_DBL *const pLFmemory, const UINT LFmemorySize, |
| FIXP_DBL *const pHFmemory, const UINT HFmemorySize); |
| |
| /** |
| * \brief Initialize and configure Hybrid Analysis Filterbank instance. |
| * |
| * \param hAnalysisHybFilter A Hybrid Analysis Filterbank handle. |
| * \param mode Select hybrid filter configuration. |
| * \param qmfBands Number of qmf bands to be processed. |
| * \param cplxBands Number of complex qmf bands to be processed. |
| * \param initStatesFlag Indicates whether the states buffer has to be |
| * cleared. |
| * |
| * \return 0 on success. |
| */ |
| INT FDKhybridAnalysisInit(HANDLE_FDK_ANA_HYB_FILTER hAnalysisHybFilter, |
| const FDK_HYBRID_MODE mode, const INT qmfBands, |
| const INT cplxBands, const INT initStatesFlag); |
| |
| /** |
| * \brief Adjust Hybrid Analysis Filterbank states. |
| * |
| * \param hAnalysisHybFilter A Hybrid Analysis Filterbank handle. |
| * \param scalingValue Scaling value to be applied on filter states. |
| * |
| * \return 0 on success. |
| */ |
| INT FDKhybridAnalysisScaleStates(HANDLE_FDK_ANA_HYB_FILTER hAnalysisHybFilter, |
| const INT scalingValue); |
| |
| /** |
| * \brief Apply Hybrid Analysis Filterbank on Qmf input data. |
| * |
| * \param hAnalysisHybFilter A Hybrid Analysis Filterbank handle. |
| * \param pQmfReal Qmf input data. |
| * \param pQmfImag Qmf input data. |
| * \param pHybridReal Hybrid output data. |
| * \param pHybridImag Hybrid output data. |
| * |
| * \return 0 on success. |
| */ |
| INT FDKhybridAnalysisApply(HANDLE_FDK_ANA_HYB_FILTER hAnalysisHybFilter, |
| const FIXP_DBL *const pQmfReal, |
| const FIXP_DBL *const pQmfImag, |
| FIXP_DBL *const pHybridReal, |
| FIXP_DBL *const pHybridImag); |
| |
| /** |
| * \brief Close a Hybrid Analysis Filterbank instance. |
| * |
| * \param hAnalysisHybFilter Pointer to a Hybrid Analysis Filterbank instance. |
| * |
| * \return 0 on success. |
| */ |
| INT FDKhybridAnalysisClose(HANDLE_FDK_ANA_HYB_FILTER hAnalysisHybFilter); |
| |
| /** |
| * \brief Initialize and configure Hybrdid Synthesis Filterbank instance. |
| * |
| * \param hSynthesisHybFilter A Hybrid Synthesis Filterbank handle. |
| * \param mode Select hybrid filter configuration. |
| * \param qmfBands Number of qmf bands to be processed. |
| * \param cplxBands Number of complex qmf bands to be processed. |
| * |
| * \return 0 on success. |
| */ |
| INT FDKhybridSynthesisInit(HANDLE_FDK_SYN_HYB_FILTER hSynthesisHybFilter, |
| const FDK_HYBRID_MODE mode, const INT qmfBands, |
| const INT cplxBands); |
| |
| /** |
| * \brief Apply Hybrid Analysis Filterbank on Hybrid data. |
| * |
| * \param hSynthesisHybFilter A Hybrid Analysis Filterbandk handle. |
| * \param pHybridReal Hybrid input data. |
| * \param pHybridImag Hybrid input data. |
| * \param pQmfReal Qmf output data. |
| * \param pQmfImag Qmf output data. |
| * |
| */ |
| void FDKhybridSynthesisApply(HANDLE_FDK_SYN_HYB_FILTER hSynthesisHybFilter, |
| const FIXP_DBL *const pHybridReal, |
| const FIXP_DBL *const pHybridImag, |
| FIXP_DBL *const pQmfReal, |
| FIXP_DBL *const pQmfImag); |
| |
| #endif /* FDK_HYBRID_H */ |