| /* ----------------------------------------------------------------------------- |
| 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 Sbr miscellaneous helper functions $Revision: 36750 $ |
| */ |
| #include "sbr_misc.h" |
| |
| void FDKsbrEnc_Shellsort_fract(FIXP_DBL *in, INT n) { |
| FIXP_DBL v; |
| INT i, j; |
| INT inc = 1; |
| |
| do |
| inc = 3 * inc + 1; |
| while (inc <= n); |
| |
| do { |
| inc = inc / 3; |
| for (i = inc + 1; i <= n; i++) { |
| v = in[i - 1]; |
| j = i; |
| while (in[j - inc - 1] > v) { |
| in[j - 1] = in[j - inc - 1]; |
| j -= inc; |
| if (j <= inc) break; |
| } |
| in[j - 1] = v; |
| } |
| } while (inc > 1); |
| } |
| |
| /* Sorting routine */ |
| void FDKsbrEnc_Shellsort_int(INT *in, INT n) { |
| INT i, j, v; |
| INT inc = 1; |
| |
| do |
| inc = 3 * inc + 1; |
| while (inc <= n); |
| |
| do { |
| inc = inc / 3; |
| for (i = inc + 1; i <= n; i++) { |
| v = in[i - 1]; |
| j = i; |
| while (in[j - inc - 1] > v) { |
| in[j - 1] = in[j - inc - 1]; |
| j -= inc; |
| if (j <= inc) break; |
| } |
| in[j - 1] = v; |
| } |
| } while (inc > 1); |
| } |
| |
| /******************************************************************************* |
| Functionname: FDKsbrEnc_AddVecLeft |
| ******************************************************************************* |
| |
| Description: |
| |
| Arguments: INT* dst, INT* length_dst, INT* src, INT length_src |
| |
| Return: none |
| |
| *******************************************************************************/ |
| void FDKsbrEnc_AddVecLeft(INT *dst, INT *length_dst, INT *src, INT length_src) { |
| INT i; |
| |
| for (i = length_src - 1; i >= 0; i--) |
| FDKsbrEnc_AddLeft(dst, length_dst, src[i]); |
| } |
| |
| /******************************************************************************* |
| Functionname: FDKsbrEnc_AddLeft |
| ******************************************************************************* |
| |
| Description: |
| |
| Arguments: INT* vector, INT* length_vector, INT value |
| |
| Return: none |
| |
| *******************************************************************************/ |
| void FDKsbrEnc_AddLeft(INT *vector, INT *length_vector, INT value) { |
| INT i; |
| |
| for (i = *length_vector; i > 0; i--) vector[i] = vector[i - 1]; |
| vector[0] = value; |
| (*length_vector)++; |
| } |
| |
| /******************************************************************************* |
| Functionname: FDKsbrEnc_AddRight |
| ******************************************************************************* |
| |
| Description: |
| |
| Arguments: INT* vector, INT* length_vector, INT value |
| |
| Return: none |
| |
| *******************************************************************************/ |
| void FDKsbrEnc_AddRight(INT *vector, INT *length_vector, INT value) { |
| vector[*length_vector] = value; |
| (*length_vector)++; |
| } |
| |
| /******************************************************************************* |
| Functionname: FDKsbrEnc_AddVecRight |
| ******************************************************************************* |
| |
| Description: |
| |
| Arguments: INT* dst, INT* length_dst, INT* src, INT length_src) |
| |
| Return: none |
| |
| *******************************************************************************/ |
| void FDKsbrEnc_AddVecRight(INT *dst, INT *length_dst, INT *src, |
| INT length_src) { |
| INT i; |
| for (i = 0; i < length_src; i++) FDKsbrEnc_AddRight(dst, length_dst, src[i]); |
| } |
| |
| /***************************************************************************** |
| |
| functionname: FDKsbrEnc_LSI_divide_scale_fract |
| |
| description: Calculates division with best precision and scales the result. |
| |
| return: num*scale/denom |
| |
| *****************************************************************************/ |
| FIXP_DBL FDKsbrEnc_LSI_divide_scale_fract(FIXP_DBL num, FIXP_DBL denom, |
| FIXP_DBL scale) { |
| FIXP_DBL tmp = FL2FXCONST_DBL(0.0f); |
| if (num != FL2FXCONST_DBL(0.0f)) { |
| INT shiftCommon; |
| INT shiftNum = CountLeadingBits(num); |
| INT shiftDenom = CountLeadingBits(denom); |
| INT shiftScale = CountLeadingBits(scale); |
| |
| num = num << shiftNum; |
| scale = scale << shiftScale; |
| |
| tmp = fMultDiv2(num, scale); |
| |
| if (denom > (tmp >> fixMin(shiftNum + shiftScale - 1, (DFRACT_BITS - 1)))) { |
| denom = denom << shiftDenom; |
| tmp = schur_div(tmp, denom, 15); |
| shiftCommon = |
| fixMin((shiftNum - shiftDenom + shiftScale - 1), (DFRACT_BITS - 1)); |
| if (shiftCommon < 0) |
| tmp <<= -shiftCommon; |
| else |
| tmp >>= shiftCommon; |
| } else { |
| tmp = /*FL2FXCONST_DBL(1.0)*/ (FIXP_DBL)MAXVAL_DBL; |
| } |
| } |
| |
| return (tmp); |
| } |