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Diffstat (limited to 'libSBRdec/src/lpp_tran.h')
| -rw-r--r-- | libSBRdec/src/lpp_tran.h | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/libSBRdec/src/lpp_tran.h b/libSBRdec/src/lpp_tran.h new file mode 100644 index 0000000..dcaadd9 --- /dev/null +++ b/libSBRdec/src/lpp_tran.h @@ -0,0 +1,184 @@ +/**************************************************************************** + + (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 + \brief Low Power Profile Transposer, $Revision: 36841 $ +*/ + +#ifndef _LPP_TRANS_H +#define _LPP_TRANS_H + +#include "sbrdecoder.h" +#include "qmf.h" + +/* + Common +*/ +#define QMF_OUT_SCALE 8 + +/* + Env-Adjust +*/ +#define MAX_NOISE_ENVELOPES 2 +#define MAX_NOISE_COEFFS 5 +#define MAX_NUM_NOISE_VALUES (MAX_NOISE_ENVELOPES * MAX_NOISE_COEFFS) +#define MAX_NUM_LIMITERS 12 + +/* Set MAX_ENVELOPES to the largest value of all supported BSFORMATs + by overriding MAX_ENVELOPES in the correct order: */ +#define MAX_ENVELOPES_HEAAC 5 +#define MAX_ENVELOPES MAX_ENVELOPES_HEAAC + +#define MAX_FREQ_COEFFS 48 +#define MAX_FREQ_COEFFS_FS44100 35 +#define MAX_FREQ_COEFFS_FS48000 32 + + +#define MAX_NUM_ENVELOPE_VALUES (MAX_ENVELOPES * MAX_FREQ_COEFFS) + +#define MAX_GAIN_EXP 34 +/* Maximum gain will be sqrt(0.5 * 2^MAX_GAIN_EXP) + example: 34=99dB */ +#define MAX_GAIN_CONCEAL_EXP 1 +/* Maximum gain will be sqrt(0.5 * 2^MAX_GAIN_CONCEAL_EXP) in concealment case (0dB) */ + +/* + LPP Transposer +*/ +#define LPC_ORDER 2 + +#define MAX_INVF_BANDS MAX_NOISE_COEFFS + +#define MAX_NUM_PATCHES 6 +#define SHIFT_START_SB 1 /*!< lowest subband of source range */ + +typedef enum +{ + INVF_OFF = 0, + INVF_LOW_LEVEL, + INVF_MID_LEVEL, + INVF_HIGH_LEVEL, + INVF_SWITCHED /* not a real choice but used here to control behaviour */ +} +INVF_MODE; + + +/** parameter set for one single patch */ +typedef struct { + UCHAR sourceStartBand; /*!< first band in lowbands where to take the samples from */ + UCHAR sourceStopBand; /*!< first band in lowbands which is not included in the patch anymore */ + UCHAR guardStartBand; /*!< first band in highbands to be filled with zeros in order to + reduce interferences between patches */ + UCHAR targetStartBand; /*!< first band in highbands to be filled with whitened lowband signal */ + UCHAR targetBandOffs; /*!< difference between 'startTargetBand' and 'startSourceBand' */ + UCHAR numBandsInPatch; /*!< number of consecutive bands in this one patch */ +} PATCH_PARAM; + + +/** whitening factors for different levels of whitening + need to be initialized corresponding to crossover frequency */ +typedef struct { + FIXP_DBL off; /*!< bw factor for signal OFF */ + FIXP_DBL transitionLevel; + FIXP_DBL lowLevel; /*!< bw factor for signal LOW_LEVEL */ + FIXP_DBL midLevel; /*!< bw factor for signal MID_LEVEL */ + FIXP_DBL highLevel; /*!< bw factor for signal HIGH_LEVEL */ +} WHITENING_FACTORS; + + +/*! The transposer settings are calculated on a header reset and are shared by both channels. */ +typedef struct { + UCHAR nCols; /*!< number subsamples of a codec frame */ + UCHAR noOfPatches; /*!< number of patches */ + UCHAR lbStartPatching; /*!< first band of lowbands that will be patched */ + UCHAR lbStopPatching; /*!< first band that won't be patched anymore*/ + UCHAR bwBorders[MAX_NUM_NOISE_VALUES]; /*!< spectral bands with different inverse filtering levels */ + + PATCH_PARAM patchParam[MAX_NUM_PATCHES]; /*!< new parameter set for patching */ + WHITENING_FACTORS whFactors; /*!< the pole moving factors for certain whitening levels as indicated + in the bitstream depending on the crossover frequency */ + UCHAR overlap; /*!< Overlap size */ +} TRANSPOSER_SETTINGS; + + +typedef struct +{ + TRANSPOSER_SETTINGS *pSettings; /*!< Common settings for both channels */ + FIXP_DBL bwVectorOld[MAX_NUM_PATCHES]; /*!< pole moving factors of past frame */ + FIXP_DBL lpcFilterStatesReal[LPC_ORDER][(32)]; /*!< pointer array to save filter states */ + FIXP_DBL lpcFilterStatesImag[LPC_ORDER][(32)]; /*!< pointer array to save filter states */ +} +SBR_LPP_TRANS; + +typedef SBR_LPP_TRANS *HANDLE_SBR_LPP_TRANS; + + +void lppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans, + QMF_SCALE_FACTOR *sbrScaleFactor, + FIXP_DBL **qmfBufferReal, + + FIXP_DBL *degreeAlias, + FIXP_DBL **qmfBufferImag, + const int useLP, + const int timeStep, + const int firstSlotOffset, + const int lastSlotOffset, + const int nInvfBands, + INVF_MODE *sbr_invf_mode, + INVF_MODE *sbr_invf_mode_prev + ); + + +SBR_ERROR +createLppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans, + TRANSPOSER_SETTINGS *pSettings, + const int highBandStartSb, + UCHAR *v_k_master, + const int numMaster, + const int usb, + const int timeSlots, + const int nCols, + UCHAR *noiseBandTable, + const int noNoiseBands, + UINT fs, + const int chan, + const int overlap); + + +SBR_ERROR +resetLppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans, + UCHAR highBandStartSb, + UCHAR *v_k_master, + UCHAR numMaster, + UCHAR *noiseBandTable, + UCHAR noNoiseBands, + UCHAR usb, + UINT fs); + + + +#endif /* _LPP_TRANS_H */ + |