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      1 
      2 /* -----------------------------------------------------------------------------------------------------------
      3 Software License for The Fraunhofer FDK AAC Codec Library for Android
      4 
      5  Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Frderung der angewandten Forschung e.V.
      6   All rights reserved.
      7 
      8  1.    INTRODUCTION
      9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
     10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
     11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
     12 
     13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
     14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
     15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
     16 of the MPEG specifications.
     17 
     18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
     19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
     20 individually for the purpose of encoding or decoding bit streams in products that are compliant with
     21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
     22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
     23 software may already be covered under those patent licenses when it is used for those licensed purposes only.
     24 
     25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
     26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
     27 applications information and documentation.
     28 
     29 2.    COPYRIGHT LICENSE
     30 
     31 Redistribution and use in source and binary forms, with or without modification, are permitted without
     32 payment of copyright license fees provided that you satisfy the following conditions:
     33 
     34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
     35 your modifications thereto in source code form.
     36 
     37 You must retain the complete text of this software license in the documentation and/or other materials
     38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
     39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
     40 modifications thereto to recipients of copies in binary form.
     41 
     42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
     43 prior written permission.
     44 
     45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
     46 software or your modifications thereto.
     47 
     48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
     49 and the date of any change. For modified versions of the FDK AAC Codec, the term
     50 "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
     51 "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
     52 
     53 3.    NO PATENT LICENSE
     54 
     55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
     56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
     57 respect to this software.
     58 
     59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
     60 by appropriate patent licenses.
     61 
     62 4.    DISCLAIMER
     63 
     64 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
     65 "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
     66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
     67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
     68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
     69 or business interruption, however caused and on any theory of liability, whether in contract, strict
     70 liability, or tort (including negligence), arising in any way out of the use of this software, even if
     71 advised of the possibility of such damage.
     72 
     73 5.    CONTACT INFORMATION
     74 
     75 Fraunhofer Institute for Integrated Circuits IIS
     76 Attention: Audio and Multimedia Departments - FDK AAC LL
     77 Am Wolfsmantel 33
     78 91058 Erlangen, Germany
     79 
     80 www.iis.fraunhofer.de/amm
     81 amm-info (at) iis.fraunhofer.de
     82 ----------------------------------------------------------------------------------------------------------- */
     83 
     84 /*!
     85   \file
     86   \brief  Sbr miscellaneous helper functions
     87 */
     88 #include "sbr_misc.h"
     89 
     90 
     91 void FDKsbrEnc_Shellsort_fract (FIXP_DBL *in, INT n)
     92 {
     93   FIXP_DBL v;
     94   INT i, j;
     95   INT inc = 1;
     96 
     97   do
     98     inc = 3 * inc + 1;
     99   while (inc <= n);
    100 
    101   do {
    102     inc = inc / 3;
    103     for (i = inc + 1; i <= n; i++) {
    104       v = in[i-1];
    105       j = i;
    106       while (in[j-inc-1] > v) {
    107         in[j-1] = in[j-inc-1];
    108         j -= inc;
    109         if (j <= inc)
    110           break;
    111       }
    112       in[j-1] = v;
    113     }
    114   } while (inc > 1);
    115 
    116 }
    117 
    118 /* Sorting routine */
    119 void FDKsbrEnc_Shellsort_int (INT *in, INT n)
    120 {
    121 
    122   INT i, j, v;
    123   INT inc = 1;
    124 
    125   do
    126     inc = 3 * inc + 1;
    127   while (inc <= n);
    128 
    129   do {
    130     inc = inc / 3;
    131     for (i = inc + 1; i <= n; i++) {
    132       v = in[i-1];
    133       j = i;
    134       while (in[j-inc-1] > v) {
    135         in[j-1] = in[j-inc-1];
    136         j -= inc;
    137         if (j <= inc)
    138           break;
    139       }
    140       in[j-1] = v;
    141     }
    142   } while (inc > 1);
    143 
    144 }
    145 
    146 
    147 
    148 /*******************************************************************************
    149  Functionname:  FDKsbrEnc_AddVecLeft
    150  *******************************************************************************
    151 
    152  Description:
    153 
    154  Arguments:   INT* dst, INT* length_dst, INT* src, INT length_src
    155 
    156  Return:      none
    157 
    158 *******************************************************************************/
    159 void
    160 FDKsbrEnc_AddVecLeft (INT *dst, INT *length_dst, INT *src, INT length_src)
    161 {
    162   INT i;
    163 
    164   for (i = length_src - 1; i >= 0; i--)
    165     FDKsbrEnc_AddLeft (dst, length_dst, src[i]);
    166 }
    167 
    168 
    169 /*******************************************************************************
    170  Functionname:  FDKsbrEnc_AddLeft
    171  *******************************************************************************
    172 
    173  Description:
    174 
    175  Arguments:   INT* vector, INT* length_vector, INT value
    176 
    177  Return:      none
    178 
    179 *******************************************************************************/
    180 void
    181 FDKsbrEnc_AddLeft (INT *vector, INT *length_vector, INT value)
    182 {
    183   INT i;
    184 
    185   for (i = *length_vector; i > 0; i--)
    186     vector[i] = vector[i - 1];
    187   vector[0] = value;
    188   (*length_vector)++;
    189 }
    190 
    191 
    192 /*******************************************************************************
    193  Functionname:  FDKsbrEnc_AddRight
    194  *******************************************************************************
    195 
    196  Description:
    197 
    198  Arguments:   INT* vector, INT* length_vector, INT value
    199 
    200  Return:      none
    201 
    202 *******************************************************************************/
    203 void
    204 FDKsbrEnc_AddRight (INT *vector, INT *length_vector, INT value)
    205 {
    206   vector[*length_vector] = value;
    207   (*length_vector)++;
    208 }
    209 
    210 
    211 
    212 /*******************************************************************************
    213  Functionname:  FDKsbrEnc_AddVecRight
    214  *******************************************************************************
    215 
    216  Description:
    217 
    218  Arguments:   INT* dst, INT* length_dst, INT* src, INT length_src)
    219 
    220  Return:      none
    221 
    222 *******************************************************************************/
    223 void
    224 FDKsbrEnc_AddVecRight (INT *dst, INT *length_dst, INT *src, INT length_src)
    225 {
    226   INT i;
    227   for (i = 0; i < length_src; i++)
    228     FDKsbrEnc_AddRight (dst, length_dst, src[i]);
    229 }
    230 
    231 
    232 /*****************************************************************************
    233 
    234   functionname: FDKsbrEnc_LSI_divide_scale_fract
    235 
    236   description:  Calculates division with best precision and scales the result.
    237 
    238   return:       num*scale/denom
    239 
    240 *****************************************************************************/
    241 FIXP_DBL FDKsbrEnc_LSI_divide_scale_fract(FIXP_DBL num, FIXP_DBL denom, FIXP_DBL scale)
    242 {
    243   FIXP_DBL tmp = FL2FXCONST_DBL(0.0f);
    244   if (num != FL2FXCONST_DBL(0.0f)) {
    245 
    246     INT shiftCommon;
    247     INT shiftNum   = CountLeadingBits(num);
    248     INT shiftDenom = CountLeadingBits(denom);
    249     INT shiftScale = CountLeadingBits(scale);
    250 
    251     num   = num   << shiftNum;
    252     scale = scale << shiftScale;
    253 
    254     tmp = fMultDiv2(num,scale);
    255 
    256     if ( denom > (tmp >> fixMin(shiftNum+shiftScale-1,(DFRACT_BITS-1))) ) {
    257       denom = denom << shiftDenom;
    258       tmp = schur_div(tmp,denom,15);
    259       shiftCommon = fixMin((shiftNum-shiftDenom+shiftScale-1),(DFRACT_BITS-1));
    260       if (shiftCommon < 0)
    261         tmp <<= -shiftCommon;
    262       else
    263         tmp >>=  shiftCommon;
    264     }
    265     else {
    266       tmp = /*FL2FXCONST_DBL(1.0)*/ (FIXP_DBL)MAXVAL_DBL;
    267     }
    268   }
    269 
    270   return (tmp);
    271 }
    272 
    273