| |
| /* ----------------------------------------------------------------------------------------------------------- |
| 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 |
| ----------------------------------------------------------------------------------------------------------- */ |
| |
| /*! |
| \file |
| \brief Transient detector prototypes |
| */ |
| #ifndef __TRAN_DET_H |
| #define __TRAN_DET_H |
| |
| #include "sbr_encoder.h" |
| #include "sbr_def.h" |
| |
| typedef struct |
| { |
| FIXP_DBL transients[QMF_MAX_TIME_SLOTS+(QMF_MAX_TIME_SLOTS/2)]; |
| FIXP_DBL thresholds[QMF_CHANNELS]; |
| FIXP_DBL tran_thr; /* Master threshold for transient signals */ |
| FIXP_DBL split_thr_m; /* Threshold for splitting FIXFIX-frames into 2 env */ |
| INT split_thr_e; /* Scale for splitting threshold */ |
| FIXP_DBL prevLowBandEnergy; /* Energy of low band */ |
| FIXP_DBL prevHighBandEnergy; /* Energy of high band */ |
| INT tran_fc; /* Number of lowband subbands to discard */ |
| INT no_cols; |
| INT no_rows; |
| INT mode; |
| |
| int frameShift; |
| int tran_off; /* Offset for reading energy values. */ |
| } |
| SBR_TRANSIENT_DETECTOR; |
| |
| |
| typedef SBR_TRANSIENT_DETECTOR *HANDLE_SBR_TRANSIENT_DETECTOR; |
| |
| #define TRAN_DET_LOOKAHEAD 2 |
| #define TRAN_DET_START_FREQ 4500 /*start frequency for transient detection*/ |
| #define TRAN_DET_STOP_FREQ 13500 /*stop frequency for transient detection*/ |
| #define TRAN_DET_MIN_QMFBANDS 4 /* minimum qmf bands for transient detection */ |
| #define QMF_HP_dBd_SLOPE_FIX FL2FXCONST_DBL(0.00075275f) /* 0.002266f/10 * log2(10) */ |
| #define TRAN_DET_THRSHLD FL2FXCONST_DBL(3.2f/4.f) |
| #define TRAN_DET_THRSHLD_SCALE (2) |
| |
| typedef struct |
| { |
| INT transientCandidates[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; |
| INT nTimeSlots; |
| INT lookahead; |
| INT startBand; |
| INT stopBand; |
| |
| FIXP_DBL dBf_m[QMF_CHANNELS]; |
| INT dBf_e[QMF_CHANNELS]; |
| |
| FIXP_DBL energy_timeSlots[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; |
| INT energy_timeSlots_scale[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; |
| |
| FIXP_DBL delta_energy[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; |
| INT delta_energy_scale[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; |
| |
| FIXP_DBL lowpass_energy[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; |
| INT lowpass_energy_scale[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; |
| #if defined (FTD_LOG) |
| FDKFILE *ftd_log; |
| #endif |
| } |
| FAST_TRAN_DETECTOR; |
| typedef FAST_TRAN_DETECTOR *HANDLE_FAST_TRAN_DET; |
| |
| |
| INT FDKsbrEnc_InitSbrFastTransientDetector( |
| HANDLE_FAST_TRAN_DET h_sbrFastTransientDetector, |
| const INT time_slots_per_frame, |
| const INT bandwidth_qmf_slot, |
| const INT no_qmf_channels, |
| const INT sbr_qmf_1st_band |
| ); |
| |
| void FDKsbrEnc_fastTransientDetect( |
| const HANDLE_FAST_TRAN_DET h_sbrFastTransientDetector, |
| const FIXP_DBL *const *Energies, |
| const int *const scaleEnergies, |
| const INT YBufferWriteOffset, |
| UCHAR *const tran_vector |
| ); |
| |
| void |
| FDKsbrEnc_transientDetect(HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, |
| FIXP_DBL **Energies, |
| INT *scaleEnergies, |
| UCHAR *tran_vector, |
| int YBufferWriteOffset, |
| int YBufferSzShift, |
| int timeStep, |
| int frameMiddleBorder); |
| |
| int |
| FDKsbrEnc_InitSbrTransientDetector (HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, |
| UINT sbrSyntaxFlags, /* SBR syntax flags derived from AOT. */ |
| INT frameSize, |
| INT sampleFreq, |
| sbrConfigurationPtr params, |
| int tran_fc, |
| int no_cols, |
| int no_rows, |
| int YBufferWriteOffset, |
| int YBufferSzShift, |
| int frameShift, |
| int tran_off); |
| |
| void |
| FDKsbrEnc_frameSplitter(FIXP_DBL **Energies, |
| INT *scaleEnergies, |
| HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, |
| UCHAR *freqBandTable, |
| UCHAR *tran_vector, |
| int YBufferWriteOffset, |
| int YBufferSzShift, |
| int nSfb, |
| int timeStep, |
| int no_cols, |
| FIXP_DBL* tonality); |
| #endif |
