/* ----------------------------------------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android © Copyright 1995 - 2015 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 ----------------------------------------------------------------------------------------------------------- */ /******************************** MPEG Audio Encoder ************************** Initial author: Alex Groeschel contents/description: Temporal noise shaping ******************************************************************************/ #ifndef _TNS_H #define _TNS_H #include "common_fix.h" #include "psy_const.h" #ifndef PI #define PI 3.1415926535897931f #endif /** * TNS_ENABLE_MASK * This bitfield defines which TNS features are enabled * The TNS mask is composed of 4 bits. * tnsMask |= 0x1; activate TNS short blocks * tnsMask |= 0x2; activate TNS for long blocks * tnsMask |= 0x4; activate TNS PEAK tool for short blocks * tnsMask |= 0x8; activate TNS PEAK tool for long blocks */ #define TNS_ENABLE_MASK 0xf /* TNS max filter order for Low Complexity MPEG4 profile */ #define TNS_MAX_ORDER 12 #define MAX_NUM_OF_FILTERS 2 #define HIFILT 0 /* index of higher filter */ #define LOFILT 1 /* index of lower filter */ typedef struct{ /* stuff that is tabulated dependent on bitrate etc. */ INT filterEnabled[MAX_NUM_OF_FILTERS]; INT threshOn[MAX_NUM_OF_FILTERS]; /* min. prediction gain for using tns TABUL*/ INT filterStartFreq[MAX_NUM_OF_FILTERS]; /* lowest freq for lpc TABUL*/ INT tnsLimitOrder[MAX_NUM_OF_FILTERS]; /* Limit for TNS order TABUL*/ INT tnsFilterDirection[MAX_NUM_OF_FILTERS]; /* Filtering direction, 0=up, 1=down TABUL */ INT acfSplit[MAX_NUM_OF_FILTERS]; FIXP_DBL tnsTimeResolution[MAX_NUM_OF_FILTERS]; /* TNS max. time resolution TABUL. Should be fract but MSVC won't compile then */ INT seperateFiltersAllowed; } TNS_PARAMETER_TABULATED; typedef struct { /*assigned at InitTime*/ TNS_PARAMETER_TABULATED confTab; INT isLowDelay; INT tnsActive; INT maxOrder; /* max. order of tns filter */ INT coefRes; FIXP_DBL acfWindow[MAX_NUM_OF_FILTERS][TNS_MAX_ORDER+3+1]; /* now some things that only probably can be done at Init time; could be they have to be split up for each individual (short) window or even filter. */ INT lpcStartBand[MAX_NUM_OF_FILTERS]; INT lpcStartLine[MAX_NUM_OF_FILTERS]; INT lpcStopBand; INT lpcStopLine; }TNS_CONFIG; typedef struct { INT tnsActive[MAX_NUM_OF_FILTERS]; INT predictionGain[MAX_NUM_OF_FILTERS]; } TNS_SUBBLOCK_INFO; typedef struct{ /*changed at runTime*/ TNS_SUBBLOCK_INFO subBlockInfo[TRANS_FAC]; FIXP_DBL ratioMultTable[TRANS_FAC][MAX_SFB_SHORT]; } TNS_DATA_SHORT; typedef struct{ /*changed at runTime*/ TNS_SUBBLOCK_INFO subBlockInfo; FIXP_DBL ratioMultTable[MAX_SFB_LONG]; } TNS_DATA_LONG; /* can be implemented as union */ typedef shouldBeUnion{ TNS_DATA_LONG Long; TNS_DATA_SHORT Short; }TNS_DATA_RAW; typedef struct{ INT numOfSubblocks; TNS_DATA_RAW dataRaw; INT tnsMaxScaleSpec; INT filtersMerged; }TNS_DATA; typedef struct{ INT numOfFilters[TRANS_FAC]; INT coefRes[TRANS_FAC]; INT length[TRANS_FAC][MAX_NUM_OF_FILTERS]; INT order[TRANS_FAC][MAX_NUM_OF_FILTERS]; INT direction[TRANS_FAC][MAX_NUM_OF_FILTERS]; INT coefCompress[TRANS_FAC][MAX_NUM_OF_FILTERS]; /* for Long: length TNS_MAX_ORDER (12 for LC) is required -> 12 */ /* for Short: length TRANS_FAC*TNS_MAX_ORDER (only 5 for short LC) is required -> 8*5=40 */ /* Currently TRANS_FAC*TNS_MAX_ORDER = 8*12 = 96 (for LC) is used (per channel)! Memory could be saved here! */ INT coef[TRANS_FAC][MAX_NUM_OF_FILTERS][TNS_MAX_ORDER]; }TNS_INFO; INT FDKaacEnc_FreqToBandWithRounding( const INT freq, const INT fs, const INT numOfBands, const INT *bandStartOffset ); #endif /* _TNS_H */