| |
| /* ----------------------------------------------------------------------------------------------------------- |
| 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 */ |