| |
| /* ----------------------------------------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2012 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 |
| ----------------------------------------------------------------------------------------------------------- */ |
| |
| /*! |
| \file |
| \brief Low Power Profile Transposer, |
| */ |
| |
| #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 */ |
| |
