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diff --git a/fdk-aac/libSBRenc/src/tran_det.h b/fdk-aac/libSBRenc/src/tran_det.h new file mode 100644 index 0000000..d10a7db --- /dev/null +++ b/fdk-aac/libSBRenc/src/tran_det.h @@ -0,0 +1,191 @@ +/* ----------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2018 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 +----------------------------------------------------------------------------- */ + +/**************************** SBR encoder library ****************************** + + Author(s): + + Description: + +*******************************************************************************/ + +/*! + \file + \brief Transient detector prototypes $Revision: 95111 $ +*/ +#ifndef TRAN_DET_H +#define TRAN_DET_H + +#include "sbr_encoder.h" +#include "sbr_def.h" + +typedef struct { + FIXP_DBL transients[32 + (32 / 2)]; + FIXP_DBL thresholds[64]; + 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(5.0f / 8.0f) +#define TRAN_DET_THRSHLD_SCALE (3) + +typedef struct { + INT transientCandidates[32 + TRAN_DET_LOOKAHEAD]; + INT nTimeSlots; + INT lookahead; + INT startBand; + INT stopBand; + + FIXP_DBL dBf_m[64]; + INT dBf_e[64]; + + FIXP_DBL energy_timeSlots[32 + TRAN_DET_LOOKAHEAD]; + INT energy_timeSlots_scale[32 + TRAN_DET_LOOKAHEAD]; + + FIXP_DBL delta_energy[32 + TRAN_DET_LOOKAHEAD]; + INT delta_energy_scale[32 + TRAN_DET_LOOKAHEAD]; + + FIXP_DBL lowpass_energy[32 + TRAN_DET_LOOKAHEAD]; + INT lowpass_energy_scale[32 + TRAN_DET_LOOKAHEAD]; +} 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 |