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fdk-aac/libFDK/include/FDK_hybrid.h

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/* -----------------------------------------------------------------------------
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 */
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