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Diffstat (limited to 'libFDK/include/qmf.h')
| -rw-r--r-- | libFDK/include/qmf.h | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/libFDK/include/qmf.h b/libFDK/include/qmf.h new file mode 100644 index 0000000..89c1061 --- /dev/null +++ b/libFDK/include/qmf.h @@ -0,0 +1,188 @@ +/**************************************************************************** + + (C) Copyright Fraunhofer IIS (2004) + All Rights Reserved + + Please be advised that this software and/or program delivery is + Confidential Information of Fraunhofer and subject to and covered by the + + Fraunhofer IIS Software Evaluation Agreement + between Google Inc. and Fraunhofer + effective and in full force since March 1, 2012. + + You may use this software and/or program only under the terms and + conditions described in the above mentioned Fraunhofer IIS Software + Evaluation Agreement. Any other and/or further use requires a separate agreement. + + + This software and/or program is protected by copyright law and international + treaties. Any reproduction or distribution of this software and/or program, + or any portion of it, may result in severe civil and criminal penalties, and + will be prosecuted to the maximum extent possible under law. + + $Id$ + +*******************************************************************************/ +/*! + \file qmf.h + \brief Complex qmf analysis/synthesis $Revision: 36871 $ + \author Markus Werner + +*/ +#ifndef __QMF_H +#define __QMF_H + + + +#include "common_fix.h" +#include "FDK_tools_rom.h" +#include "dct.h" + +/* + * Filter coefficient type definition + */ +#ifdef QMF_DATA_16BIT +#define FIXP_QMF FIXP_SGL +#define FX_DBL2FX_QMF FX_DBL2FX_SGL +#define FX_QMF2FX_DBL FX_SGL2FX_DBL +#define QFRACT_BITS FRACT_BITS +#else +#define FIXP_QMF FIXP_DBL +#define FX_DBL2FX_QMF +#define FX_QMF2FX_DBL +#define QFRACT_BITS DFRACT_BITS +#endif + +/* ARM neon optimized QMF analysis filter requires 32 bit input. + Implemented for RVCT only, currently disabled. See src/arm/qmf_arm.cpp:45 */ +#define FIXP_QAS FIXP_PCM +#define QAS_BITS SAMPLE_BITS + +#ifdef QMFSYN_STATES_16BIT +#define FIXP_QSS FIXP_SGL +#define QSS_BITS FRACT_BITS +#else +#define FIXP_QSS FIXP_DBL +#define QSS_BITS DFRACT_BITS +#endif + +/* Flags for QMF intialization */ +/* Low Power mode flag */ +#define QMF_FLAG_LP 1 +/* Filter is not symetric. This flag is set internally in the QMF initialization as required. */ +#define QMF_FLAG_NONSYMMETRIC 2 +/* Complex Low Delay Filter Bank (or std symmetric filter bank) */ +#define QMF_FLAG_CLDFB 4 +/* Flag indicating that the states should be kept. */ +#define QMF_FLAG_KEEP_STATES 8 +/* Complex Low Delay Filter Bank used in MPEG Surround Encoder */ +#define QMF_FLAG_MPSLDFB 16 +/* Complex Low Delay Filter Bank used in MPEG Surround Encoder allows a optimized calculation of the modulation in qmfForwardModulationHQ() */ +#define QMF_FLAG_MPSLDFB_OPTIMIZE_MODULATION 32 + + +typedef struct +{ + int lb_scale; /*!< Scale of low band area */ + int ov_lb_scale; /*!< Scale of adjusted overlap low band area */ + int hb_scale; /*!< Scale of high band area */ + int ov_hb_scale; /*!< Scale of adjusted overlap high band area */ +} QMF_SCALE_FACTOR; + +struct QMF_FILTER_BANK +{ + const FIXP_PFT *p_filter; /*!< Pointer to filter coefficients */ + + void *FilterStates; /*!< Pointer to buffer of filter states + FIXP_PCM in analyse and + FIXP_DBL in synthesis filter */ + int FilterSize; /*!< Size of prototype filter. */ + const FIXP_QTW *t_cos; /*!< Modulation tables. */ + const FIXP_QTW *t_sin; + int filterScale; /*!< filter scale */ + + int no_channels; /*!< Total number of channels (subbands) */ + int no_col; /*!< Number of time slots */ + int lsb; /*!< Top of low subbands */ + int usb; /*!< Top of high subbands */ + + int outScalefactor; /*!< Scale factor of output data (syn only) */ + FIXP_DBL outGain; /*!< Gain output data (syn only) (init with 0x80000000 to ignore) */ + + UINT flags; /*!< flags */ + UCHAR p_stride; /*!< Stride Factor of polyphase filters */ + +}; + +typedef struct QMF_FILTER_BANK *HANDLE_QMF_FILTER_BANK; + +void +qmfAnalysisFiltering( HANDLE_QMF_FILTER_BANK anaQmf, /*!< Handle of Qmf Analysis Bank */ + FIXP_QMF **qmfReal, /*!< Pointer to real subband slots */ + FIXP_QMF **qmfImag, /*!< Pointer to imag subband slots */ + QMF_SCALE_FACTOR *scaleFactor, /*!< Scale factors of QMF data */ + const INT_PCM *timeIn, /*!< Time signal */ + const int stride, /*!< Stride factor of audio data */ + FIXP_QMF *pWorkBuffer /*!< pointer to temporal working buffer */ + ); + +void +qmfSynthesisFiltering( HANDLE_QMF_FILTER_BANK synQmf, /*!< Handle of Qmf Synthesis Bank */ + FIXP_QMF **QmfBufferReal, /*!< Pointer to real subband slots */ + FIXP_QMF **QmfBufferImag, /*!< Pointer to imag subband slots */ + const QMF_SCALE_FACTOR *scaleFactor, /*!< Scale factors of QMF data */ + const int ov_len, /*!< Length of band overlap */ + INT_PCM *timeOut, /*!< Time signal */ + const int stride, /*!< Stride factor of audio data */ + FIXP_QMF *pWorkBuffer /*!< pointer to temporal working buffer */ + ); + +int +qmfInitAnalysisFilterBank( HANDLE_QMF_FILTER_BANK h_Qmf, /*!< QMF Handle */ + FIXP_QAS *pFilterStates, /*!< Pointer to filter state buffer */ + int noCols, /*!< Number of time slots */ + int lsb, /*!< Number of lower bands */ + int usb, /*!< Number of upper bands */ + int no_channels, /*!< Number of critically sampled bands */ + int flags); /*!< Flags */ + +void +qmfAnalysisFilteringSlot( HANDLE_QMF_FILTER_BANK anaQmf, /*!< Handle of Qmf Synthesis Bank */ + FIXP_QMF *qmfReal, /*!< Low and High band, real */ + FIXP_QMF *qmfImag, /*!< Low and High band, imag */ + const INT_PCM *timeIn, /*!< Pointer to input */ + const int stride, /*!< stride factor of input */ + FIXP_QMF *pWorkBuffer /*!< pointer to temporal working buffer */ + ); + +int +qmfInitSynthesisFilterBank( HANDLE_QMF_FILTER_BANK h_Qmf, /*!< QMF Handle */ + FIXP_QSS *pFilterStates, /*!< Pointer to filter state buffer */ + int noCols, /*!< Number of time slots */ + int lsb, /*!< Number of lower bands */ + int usb, /*!< Number of upper bands */ + int no_channels, /*!< Number of critically sampled bands */ + int flags); /*!< Flags */ + +void qmfSynthesisFilteringSlot( HANDLE_QMF_FILTER_BANK synQmf, + const FIXP_QMF *realSlot, + const FIXP_QMF *imagSlot, + const int scaleFactorLowBand, + const int scaleFactorHighBand, + INT_PCM *timeOut, + const int stride, + FIXP_QMF *pWorkBuffer); + +void +qmfChangeOutScalefactor (HANDLE_QMF_FILTER_BANK synQmf, /*!< Handle of Qmf Synthesis Bank */ + int outScalefactor /*!< New scaling factor for output data */ + ); + +void +qmfChangeOutGain (HANDLE_QMF_FILTER_BANK synQmf, /*!< Handle of Qmf Synthesis Bank */ + FIXP_DBL outputGain /*!< New gain for output data */ + ); + + + +#endif /* __QMF_H */ |