9bf37cc971
License boilerplate update to follow. Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
189 lines
8.2 KiB
C
189 lines
8.2 KiB
C
/****************************************************************************
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(C) Copyright Fraunhofer IIS (2004)
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All Rights Reserved
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Please be advised that this software and/or program delivery is
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Confidential Information of Fraunhofer and subject to and covered by the
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Fraunhofer IIS Software Evaluation Agreement
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between Google Inc. and Fraunhofer
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effective and in full force since March 1, 2012.
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You may use this software and/or program only under the terms and
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conditions described in the above mentioned Fraunhofer IIS Software
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Evaluation Agreement. Any other and/or further use requires a separate agreement.
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This software and/or program is protected by copyright law and international
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treaties. Any reproduction or distribution of this software and/or program,
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or any portion of it, may result in severe civil and criminal penalties, and
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will be prosecuted to the maximum extent possible under law.
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$Id$
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*******************************************************************************/
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/*!
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\file qmf.h
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\brief Complex qmf analysis/synthesis $Revision: 36871 $
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\author Markus Werner
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*/
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#ifndef __QMF_H
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#define __QMF_H
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#include "common_fix.h"
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#include "FDK_tools_rom.h"
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#include "dct.h"
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/*
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* Filter coefficient type definition
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*/
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#ifdef QMF_DATA_16BIT
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#define FIXP_QMF FIXP_SGL
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#define FX_DBL2FX_QMF FX_DBL2FX_SGL
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#define FX_QMF2FX_DBL FX_SGL2FX_DBL
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#define QFRACT_BITS FRACT_BITS
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#else
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#define FIXP_QMF FIXP_DBL
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#define FX_DBL2FX_QMF
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#define FX_QMF2FX_DBL
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#define QFRACT_BITS DFRACT_BITS
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#endif
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/* ARM neon optimized QMF analysis filter requires 32 bit input.
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Implemented for RVCT only, currently disabled. See src/arm/qmf_arm.cpp:45 */
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#define FIXP_QAS FIXP_PCM
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#define QAS_BITS SAMPLE_BITS
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#ifdef QMFSYN_STATES_16BIT
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#define FIXP_QSS FIXP_SGL
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#define QSS_BITS FRACT_BITS
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#else
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#define FIXP_QSS FIXP_DBL
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#define QSS_BITS DFRACT_BITS
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#endif
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/* Flags for QMF intialization */
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/* Low Power mode flag */
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#define QMF_FLAG_LP 1
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/* Filter is not symetric. This flag is set internally in the QMF initialization as required. */
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#define QMF_FLAG_NONSYMMETRIC 2
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/* Complex Low Delay Filter Bank (or std symmetric filter bank) */
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#define QMF_FLAG_CLDFB 4
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/* Flag indicating that the states should be kept. */
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#define QMF_FLAG_KEEP_STATES 8
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/* Complex Low Delay Filter Bank used in MPEG Surround Encoder */
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#define QMF_FLAG_MPSLDFB 16
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/* Complex Low Delay Filter Bank used in MPEG Surround Encoder allows a optimized calculation of the modulation in qmfForwardModulationHQ() */
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#define QMF_FLAG_MPSLDFB_OPTIMIZE_MODULATION 32
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typedef struct
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{
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int lb_scale; /*!< Scale of low band area */
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int ov_lb_scale; /*!< Scale of adjusted overlap low band area */
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int hb_scale; /*!< Scale of high band area */
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int ov_hb_scale; /*!< Scale of adjusted overlap high band area */
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} QMF_SCALE_FACTOR;
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struct QMF_FILTER_BANK
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{
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const FIXP_PFT *p_filter; /*!< Pointer to filter coefficients */
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void *FilterStates; /*!< Pointer to buffer of filter states
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FIXP_PCM in analyse and
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FIXP_DBL in synthesis filter */
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int FilterSize; /*!< Size of prototype filter. */
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const FIXP_QTW *t_cos; /*!< Modulation tables. */
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const FIXP_QTW *t_sin;
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int filterScale; /*!< filter scale */
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int no_channels; /*!< Total number of channels (subbands) */
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int no_col; /*!< Number of time slots */
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int lsb; /*!< Top of low subbands */
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int usb; /*!< Top of high subbands */
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int outScalefactor; /*!< Scale factor of output data (syn only) */
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FIXP_DBL outGain; /*!< Gain output data (syn only) (init with 0x80000000 to ignore) */
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UINT flags; /*!< flags */
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UCHAR p_stride; /*!< Stride Factor of polyphase filters */
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};
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typedef struct QMF_FILTER_BANK *HANDLE_QMF_FILTER_BANK;
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void
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qmfAnalysisFiltering( HANDLE_QMF_FILTER_BANK anaQmf, /*!< Handle of Qmf Analysis Bank */
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FIXP_QMF **qmfReal, /*!< Pointer to real subband slots */
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FIXP_QMF **qmfImag, /*!< Pointer to imag subband slots */
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QMF_SCALE_FACTOR *scaleFactor, /*!< Scale factors of QMF data */
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const INT_PCM *timeIn, /*!< Time signal */
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const int stride, /*!< Stride factor of audio data */
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FIXP_QMF *pWorkBuffer /*!< pointer to temporal working buffer */
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);
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void
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qmfSynthesisFiltering( HANDLE_QMF_FILTER_BANK synQmf, /*!< Handle of Qmf Synthesis Bank */
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FIXP_QMF **QmfBufferReal, /*!< Pointer to real subband slots */
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FIXP_QMF **QmfBufferImag, /*!< Pointer to imag subband slots */
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const QMF_SCALE_FACTOR *scaleFactor, /*!< Scale factors of QMF data */
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const int ov_len, /*!< Length of band overlap */
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INT_PCM *timeOut, /*!< Time signal */
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const int stride, /*!< Stride factor of audio data */
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FIXP_QMF *pWorkBuffer /*!< pointer to temporal working buffer */
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);
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int
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qmfInitAnalysisFilterBank( HANDLE_QMF_FILTER_BANK h_Qmf, /*!< QMF Handle */
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FIXP_QAS *pFilterStates, /*!< Pointer to filter state buffer */
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int noCols, /*!< Number of time slots */
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int lsb, /*!< Number of lower bands */
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int usb, /*!< Number of upper bands */
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int no_channels, /*!< Number of critically sampled bands */
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int flags); /*!< Flags */
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void
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qmfAnalysisFilteringSlot( HANDLE_QMF_FILTER_BANK anaQmf, /*!< Handle of Qmf Synthesis Bank */
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FIXP_QMF *qmfReal, /*!< Low and High band, real */
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FIXP_QMF *qmfImag, /*!< Low and High band, imag */
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const INT_PCM *timeIn, /*!< Pointer to input */
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const int stride, /*!< stride factor of input */
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FIXP_QMF *pWorkBuffer /*!< pointer to temporal working buffer */
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);
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int
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qmfInitSynthesisFilterBank( HANDLE_QMF_FILTER_BANK h_Qmf, /*!< QMF Handle */
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FIXP_QSS *pFilterStates, /*!< Pointer to filter state buffer */
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int noCols, /*!< Number of time slots */
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int lsb, /*!< Number of lower bands */
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int usb, /*!< Number of upper bands */
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int no_channels, /*!< Number of critically sampled bands */
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int flags); /*!< Flags */
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void qmfSynthesisFilteringSlot( HANDLE_QMF_FILTER_BANK synQmf,
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const FIXP_QMF *realSlot,
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const FIXP_QMF *imagSlot,
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const int scaleFactorLowBand,
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const int scaleFactorHighBand,
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INT_PCM *timeOut,
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const int stride,
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FIXP_QMF *pWorkBuffer);
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void
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qmfChangeOutScalefactor (HANDLE_QMF_FILTER_BANK synQmf, /*!< Handle of Qmf Synthesis Bank */
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int outScalefactor /*!< New scaling factor for output data */
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);
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void
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qmfChangeOutGain (HANDLE_QMF_FILTER_BANK synQmf, /*!< Handle of Qmf Synthesis Bank */
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FIXP_DBL outputGain /*!< New gain for output data */
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);
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#endif /* __QMF_H */
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