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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 - 2013 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
----------------------------------------------------------------------------------------------------------- */
/*************************** Fraunhofer IIS FDK Tools **********************
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 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 Hybrdid 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 Hybrdid 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.
*
* \return 0 on success.
*/
INT 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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