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sbr_hfadj.c
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上传日期：2014-04-03
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文件大小：83k
源码类别：

Windows CE

开发平台：

C/C++

sbr_hfadj.c：源码内容
  1. /*
  2. ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
  3. ** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
  4. **  
  5. ** This program is free software; you can redistribute it and/or modify
  6. ** it under the terms of the GNU General Public License as published by
  7. ** the Free Software Foundation; either version 2 of the License, or
  8. ** (at your option) any later version.
  9. ** 
  10. ** This program is distributed in the hope that it will be useful,
  11. ** but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13. ** GNU General Public License for more details.
  14. ** 
  15. ** You should have received a copy of the GNU General Public License
  16. ** along with this program; if not, write to the Free Software 
  17. ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18. **
  19. ** Any non-GPL usage of this software or parts of this software is strictly
  20. ** forbidden.
  21. **
  22. ** Commercial non-GPL licensing of this software is possible.
  23. ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
  24. **
  25. ** $Id: sbr_hfadj.c,v 1.18 2004/09/04 14:56:28 menno Exp $
  26. **/
  28. /* High Frequency adjustment */
  30. #include "common.h"
  31. #include "structs.h"
  33. #ifdef SBR_DEC
  35. #include "sbr_syntax.h"
  36. #include "sbr_hfadj.h"
  38. #include "sbr_noise.h"
  41. /* static function declarations */
  42. static void estimate_current_envelope(sbr_info *sbr, sbr_hfadj_info *adj,
  43.                                       qmf_t Xsbr[MAX_NTSRHFG][64], uint8_t ch);
  44. static void calculate_gain(sbr_info *sbr, sbr_hfadj_info *adj, uint8_t ch);
  45. #ifdef SBR_LOW_POWER
  46. static void calc_gain_groups(sbr_info *sbr, sbr_hfadj_info *adj, real_t *deg, uint8_t ch);
  47. static void aliasing_reduction(sbr_info *sbr, sbr_hfadj_info *adj, real_t *deg, uint8_t ch);
  48. #endif
  49. static void hf_assembly(sbr_info *sbr, sbr_hfadj_info *adj, qmf_t Xsbr[MAX_NTSRHFG][64], uint8_t ch);
  52. void hf_adjustment(sbr_info *sbr, qmf_t Xsbr[MAX_NTSRHFG][64]
  53. #ifdef SBR_LOW_POWER
  54.                    ,real_t *deg /* aliasing degree */
  55. #endif
  56.                    ,uint8_t ch)
  57. {
  58.     ALIGN sbr_hfadj_info adj = {{{0}}};
  60.     if (sbr->bs_frame_class[ch] == FIXFIX)
  61.     {
  62.         sbr->l_A[ch] = -1;
  63.     } else if (sbr->bs_frame_class[ch] == VARFIX) {
  64.         if (sbr->bs_pointer[ch] > 1)
  65.             sbr->l_A[ch] = -1;
  66.         else
  67.             sbr->l_A[ch] = sbr->bs_pointer[ch] - 1;
  68.     } else {
  69.         if (sbr->bs_pointer[ch] == 0)
  70.             sbr->l_A[ch] = -1;
  71.         else
  72.             sbr->l_A[ch] = sbr->L_E[ch] + 1 - sbr->bs_pointer[ch];
  73.     }
  75.     estimate_current_envelope(sbr, &adj, Xsbr, ch);
  77.     calculate_gain(sbr, &adj, ch);
  79. #ifdef SBR_LOW_POWER
  80.     calc_gain_groups(sbr, &adj, deg, ch);
  81.     aliasing_reduction(sbr, &adj, deg, ch);
  82. #endif
  84.     hf_assembly(sbr, &adj, Xsbr, ch);
  85. }
  87. static uint8_t get_S_mapped(sbr_info *sbr, uint8_t ch, uint8_t l, uint8_t current_band)
  88. {
  89.     if (sbr->f[ch][l] == HI_RES)
  90.     {
  91.         /* in case of using f_table_high we just have 1 to 1 mapping
  92.          * from bs_add_harmonic[l][k]
  93.          */
  94.         if ((l >= sbr->l_A[ch]) ||
  95.             (sbr->bs_add_harmonic_prev[ch][current_band] && sbr->bs_add_harmonic_flag_prev[ch]))
  96.         {
  97.             return sbr->bs_add_harmonic[ch][current_band];
  98.         }
  99.     } else {
  100.         uint8_t b, lb, ub;
  102.         /* in case of f_table_low we check if any of the HI_RES bands
  103.          * within this LO_RES band has bs_add_harmonic[l][k] turned on
  104.          * (note that borders in the LO_RES table are also present in
  105.          * the HI_RES table)
  106.          */
  108.         /* find first HI_RES band in current LO_RES band */
  109.         lb = 2*current_band - ((sbr->N_high & 1) ? 1 : 0);
  110.         /* find first HI_RES band in next LO_RES band */
  111.         ub = 2*(current_band+1) - ((sbr->N_high & 1) ? 1 : 0);
  113.         /* check all HI_RES bands in current LO_RES band for sinusoid */
  114.         for (b = lb; b < ub; b++)
  115.         {
  116.             if ((l >= sbr->l_A[ch]) ||
  117.                 (sbr->bs_add_harmonic_prev[ch][b] && sbr->bs_add_harmonic_flag_prev[ch]))
  118.             {
  119.                 if (sbr->bs_add_harmonic[ch][b] == 1)
  120.                     return 1;
  121.             }
  122.         }
  123.     }
  125.     return 0;
  126. }
  128. static void estimate_current_envelope(sbr_info *sbr, sbr_hfadj_info *adj,
  129.                                       qmf_t Xsbr[MAX_NTSRHFG][64], uint8_t ch)
  130. {
  131.     uint8_t m, l, j, k, k_l, k_h, p;
  132.     real_t nrg, div;
  134.     if (sbr->bs_interpol_freq == 1)
  135.     {
  136.         for (l = 0; l < sbr->L_E[ch]; l++)
  137.         {
  138.             uint8_t i, l_i, u_i;
  140.             l_i = sbr->t_E[ch][l];
  141.             u_i = sbr->t_E[ch][l+1];
  143.             div = (real_t)(u_i - l_i);
  145.             for (m = 0; m < sbr->M; m++)
  146.             {
  147.                 nrg = 0;
  149.                 for (i = l_i + sbr->tHFAdj; i < u_i + sbr->tHFAdj; i++)
  150.                 {
  151. #ifdef FIXED_POINT
  152. #ifdef SBR_LOW_POWER
  153.                     nrg += ((QMF_RE(Xsbr[i][m + sbr->kx])+(1<<(REAL_BITS-1)))>>REAL_BITS)*((QMF_RE(Xsbr[i][m + sbr->kx])+(1<<(REAL_BITS-1)))>>REAL_BITS);
  154. #else
  155.                     nrg += ((QMF_RE(Xsbr[i][m + sbr->kx])+(1<<(REAL_BITS-1)))>>REAL_BITS)*((QMF_RE(Xsbr[i][m + sbr->kx])+(1<<(REAL_BITS-1)))>>REAL_BITS) +
  156.                         ((QMF_IM(Xsbr[i][m + sbr->kx])+(1<<(REAL_BITS-1)))>>REAL_BITS)*((QMF_IM(Xsbr[i][m + sbr->kx])+(1<<(REAL_BITS-1)))>>REAL_BITS);
  157. #endif
  158. #else
  159.                     nrg += MUL_R(QMF_RE(Xsbr[i][m + sbr->kx]), QMF_RE(Xsbr[i][m + sbr->kx]))
  160. #ifndef SBR_LOW_POWER
  161.                         + MUL_R(QMF_IM(Xsbr[i][m + sbr->kx]), QMF_IM(Xsbr[i][m + sbr->kx]))
  162. #endif
  163.                         ;
  164. #endif
  165.                 }
  167.                 sbr->E_curr[ch][m][l] = nrg / div;
  168. #ifdef SBR_LOW_POWER
  169. #ifdef FIXED_POINT
  170.                 sbr->E_curr[ch][m][l] <<= 1;
  171. #else
  172.                 sbr->E_curr[ch][m][l] *= 2;
  173. #endif
  174. #endif
  175.             }
  176.         }
  177.     } else {
  178.         for (l = 0; l < sbr->L_E[ch]; l++)
  179.         {
  180.             for (p = 0; p < sbr->n[sbr->f[ch][l]]; p++)
  181.             {
  182.                 k_l = sbr->f_table_res[sbr->f[ch][l]][p];
  183.                 k_h = sbr->f_table_res[sbr->f[ch][l]][p+1];
  185.                 for (k = k_l; k < k_h; k++)
  186.                 {
  187.                     uint8_t i, l_i, u_i;
  188.                     nrg = 0;
  190.                     l_i = sbr->t_E[ch][l];
  191.                     u_i = sbr->t_E[ch][l+1];
  193.                     div = (real_t)((u_i - l_i)*(k_h - k_l));
  195.                     for (i = l_i + sbr->tHFAdj; i < u_i + sbr->tHFAdj; i++)
  196.                     {
  197.                         for (j = k_l; j < k_h; j++)
  198.                         {
  199. #ifdef FIXED_POINT
  200. #ifdef SBR_LOW_POWER
  201.                             nrg += ((QMF_RE(Xsbr[i][j])+(1<<(REAL_BITS-1)))>>REAL_BITS)*((QMF_RE(Xsbr[i][j])+(1<<(REAL_BITS-1)))>>REAL_BITS);
  202. #else
  203.                             nrg += ((QMF_RE(Xsbr[i][j])+(1<<(REAL_BITS-1)))>>REAL_BITS)*((QMF_RE(Xsbr[i][j])+(1<<(REAL_BITS-1)))>>REAL_BITS) +
  204.                                 ((QMF_IM(Xsbr[i][j])+(1<<(REAL_BITS-1)))>>REAL_BITS)*((QMF_IM(Xsbr[i][j])+(1<<(REAL_BITS-1)))>>REAL_BITS);
  205. #endif
  206. #else
  207.                             nrg += MUL_R(QMF_RE(Xsbr[i][j]), QMF_RE(Xsbr[i][j]))
  208. #ifndef SBR_LOW_POWER
  209.                                 + MUL_R(QMF_IM(Xsbr[i][j]), QMF_IM(Xsbr[i][j]))
  210. #endif
  211.                                 ;
  212. #endif
  213.                         }
  214.                     }
  216.                     sbr->E_curr[ch][k - sbr->kx][l] = nrg / div;
  217. #ifdef SBR_LOW_POWER
  218. #ifdef FIXED_POINT
  219.                     sbr->E_curr[ch][k - sbr->kx][l] <<= 1;
  220. #else
  221.                     sbr->E_curr[ch][k - sbr->kx][l] *= 2;
  222. #endif
  223. #endif
  224.                 }
  225.             }
  226.         }
  227.     }
  228. }
  230. #ifdef FIXED_POINT
  231. #define EPS (1) /* smallest number available in fixed point */
  232. #else
  233. #define EPS (1e-12)
  234. #endif
  238. #ifdef FIXED_POINT
  240. /* log2 values of [0..63] */
  241. static const real_t log2_int_tab[] = {
  242.     LOG2_MIN_INF, REAL_CONST(0.000000000000000), REAL_CONST(1.000000000000000), REAL_CONST(1.584962500721156),
  243.     REAL_CONST(2.000000000000000), REAL_CONST(2.321928094887362), REAL_CONST(2.584962500721156), REAL_CONST(2.807354922057604),
  244.     REAL_CONST(3.000000000000000), REAL_CONST(3.169925001442313), REAL_CONST(3.321928094887363), REAL_CONST(3.459431618637297),
  245.     REAL_CONST(3.584962500721156), REAL_CONST(3.700439718141092), REAL_CONST(3.807354922057604), REAL_CONST(3.906890595608519),
  246.     REAL_CONST(4.000000000000000), REAL_CONST(4.087462841250339), REAL_CONST(4.169925001442312), REAL_CONST(4.247927513443585),
  247.     REAL_CONST(4.321928094887362), REAL_CONST(4.392317422778761), REAL_CONST(4.459431618637297), REAL_CONST(4.523561956057013),
  248.     REAL_CONST(4.584962500721156), REAL_CONST(4.643856189774724), REAL_CONST(4.700439718141093), REAL_CONST(4.754887502163468),
  249.     REAL_CONST(4.807354922057604), REAL_CONST(4.857980995127572), REAL_CONST(4.906890595608519), REAL_CONST(4.954196310386875),
  250.     REAL_CONST(5.000000000000000), REAL_CONST(5.044394119358453), REAL_CONST(5.087462841250340), REAL_CONST(5.129283016944966),
  251.     REAL_CONST(5.169925001442312), REAL_CONST(5.209453365628949), REAL_CONST(5.247927513443585), REAL_CONST(5.285402218862248),
  252.     REAL_CONST(5.321928094887363), REAL_CONST(5.357552004618084), REAL_CONST(5.392317422778761), REAL_CONST(5.426264754702098),
  253.     REAL_CONST(5.459431618637297), REAL_CONST(5.491853096329675), REAL_CONST(5.523561956057013), REAL_CONST(5.554588851677637),
  254.     REAL_CONST(5.584962500721156), REAL_CONST(5.614709844115208), REAL_CONST(5.643856189774724), REAL_CONST(5.672425341971495),
  255.     REAL_CONST(5.700439718141093), REAL_CONST(5.727920454563200), REAL_CONST(5.754887502163469), REAL_CONST(5.781359713524660),
  256.     REAL_CONST(5.807354922057605), REAL_CONST(5.832890014164742), REAL_CONST(5.857980995127572), REAL_CONST(5.882643049361842),
  257.     REAL_CONST(5.906890595608518), REAL_CONST(5.930737337562887), REAL_CONST(5.954196310386876), REAL_CONST(5.977279923499916)
  258. };
  260. static const real_t pan_log2_tab[] = {
  261.     REAL_CONST(1.000000000000000), REAL_CONST(0.584962500721156), REAL_CONST(0.321928094887362), REAL_CONST(0.169925001442312), REAL_CONST(0.087462841250339),
  262.     REAL_CONST(0.044394119358453), REAL_CONST(0.022367813028455), REAL_CONST(0.011227255423254), REAL_CONST(0.005624549193878), REAL_CONST(0.002815015607054),
  263.     REAL_CONST(0.001408194392808), REAL_CONST(0.000704269011247), REAL_CONST(0.000352177480301), REAL_CONST(0.000176099486443), REAL_CONST(0.000088052430122),
  264.     REAL_CONST(0.000044026886827), REAL_CONST(0.000022013611360), REAL_CONST(0.000011006847667)
  265. };
  267. static real_t find_log2_E(sbr_info *sbr, uint8_t k, uint8_t l, uint8_t ch)
  268. {
  269.     /* check for coupled energy/noise data */
  270.     if (sbr->bs_coupling == 1)
  271.     {
  272.         uint8_t amp0 = (sbr->amp_res[0]) ? 0 : 1;
  273.         uint8_t amp1 = (sbr->amp_res[1]) ? 0 : 1;
  274.         real_t tmp = (7 << REAL_BITS) + (sbr->E[0][k][l] << (REAL_BITS-amp0));
  275.         real_t pan;
  277.         /* E[1] should always be even so shifting is OK */
  278.         uint8_t E = sbr->E[1][k][l] >> amp1;
  280.         if (ch == 0)
  281.         {
  282.             if (E > 12)
  283.             {
  284.                 /* negative */
  285.                 pan = pan_log2_tab[-12 + E];
  286.             } else {
  287.                 /* positive */
  288.                 pan = pan_log2_tab[12 - E] + ((12 - E)<<REAL_BITS);
  289.             }
  290.         } else {
  291.             if (E < 12)
  292.             {
  293.                 /* negative */
  294.                 pan = pan_log2_tab[-E + 12];
  295.             } else {
  296.                 /* positive */
  297.                 pan = pan_log2_tab[E - 12] + ((E - 12)<<REAL_BITS);
  298.             }
  299.         }
  301.         /* tmp / pan in log2 */
  302.         return tmp - pan;
  303.     } else {
  304.         uint8_t amp = (sbr->amp_res[ch]) ? 0 : 1;
  306.         return (6 << REAL_BITS) + (sbr->E[ch][k][l] << (REAL_BITS-amp));
  307.     }
  308. }
  310. static real_t find_log2_Q(sbr_info *sbr, uint8_t k, uint8_t l, uint8_t ch)
  311. {
  312.     /* check for coupled energy/noise data */
  313.     if (sbr->bs_coupling == 1)
  314.     {
  315.         real_t tmp = (7 << REAL_BITS) - (sbr->Q[0][k][l] << REAL_BITS);
  316.         real_t pan;
  318.         uint8_t Q = sbr->Q[1][k][l];
  320.         if (ch == 0)
  321.         {
  322.             if (Q > 12)
  323.             {
  324.                 /* negative */
  325.                 pan = pan_log2_tab[-12 + Q];
  326.             } else {
  327.                 /* positive */
  328.                 pan = pan_log2_tab[12 - Q] + ((12 - Q)<<REAL_BITS);
  329.             }
  330.         } else {
  331.             if (Q < 12)
  332.             {
  333.                 /* negative */
  334.                 pan = pan_log2_tab[-Q + 12];
  335.             } else {
  336.                 /* positive */
  337.                 pan = pan_log2_tab[Q - 12] + ((Q - 12)<<REAL_BITS);
  338.             }
  339.         }
  341.         /* tmp / pan in log2 */
  342.         return tmp - pan;
  343.     } else {
  344.         return (6 << REAL_BITS) - (sbr->Q[ch][k][l] << REAL_BITS);
  345.     }
  346. }
  348. static const real_t log_Qplus1_pan[31][13] = {
  349.     { REAL_CONST(0.044383447617292), REAL_CONST(0.169768601655960), REAL_CONST(0.583090126514435), REAL_CONST(1.570089221000671), REAL_CONST(3.092446088790894), REAL_CONST(4.733354568481445), REAL_CONST(6.022367954254150), REAL_CONST(6.692092418670654), REAL_CONST(6.924463272094727), REAL_CONST(6.989034175872803), REAL_CONST(7.005646705627441), REAL_CONST(7.009829998016357), REAL_CONST(7.010877609252930) },
  350.     { REAL_CONST(0.022362394258380), REAL_CONST(0.087379962205887), REAL_CONST(0.320804953575134), REAL_CONST(0.988859415054321), REAL_CONST(2.252387046813965), REAL_CONST(3.786596298217773), REAL_CONST(5.044394016265869), REAL_CONST(5.705977916717529), REAL_CONST(5.936291694641113), REAL_CONST(6.000346660614014), REAL_CONST(6.016829967498779), REAL_CONST(6.020981311798096), REAL_CONST(6.022020816802979) },
  351.     { REAL_CONST(0.011224525049329), REAL_CONST(0.044351425021887), REAL_CONST(0.169301137328148), REAL_CONST(0.577544987201691), REAL_CONST(1.527246952056885), REAL_CONST(2.887525320053101), REAL_CONST(4.087462902069092), REAL_CONST(4.733354568481445), REAL_CONST(4.959661006927490), REAL_CONST(5.022709369659424), REAL_CONST(5.038940429687500), REAL_CONST(5.043028831481934), REAL_CONST(5.044052600860596) },
  352.     { REAL_CONST(0.005623178556561), REAL_CONST(0.022346137091517), REAL_CONST(0.087132595479488), REAL_CONST(0.317482173442841), REAL_CONST(0.956931233406067), REAL_CONST(2.070389270782471), REAL_CONST(3.169924974441528), REAL_CONST(3.786596298217773), REAL_CONST(4.005294322967529), REAL_CONST(4.066420555114746), REAL_CONST(4.082170009613037), REAL_CONST(4.086137294769287), REAL_CONST(4.087131500244141) },
  353.     { REAL_CONST(0.002814328996465), REAL_CONST(0.011216334067285), REAL_CONST(0.044224001467228), REAL_CONST(0.167456731200218), REAL_CONST(0.556393325328827), REAL_CONST(1.378511548042297), REAL_CONST(2.321928024291992), REAL_CONST(2.887525320053101), REAL_CONST(3.092446088790894), REAL_CONST(3.150059700012207), REAL_CONST(3.164926528930664), REAL_CONST(3.168673276901245), REAL_CONST(3.169611930847168) },
  354.     { REAL_CONST(0.001407850766554), REAL_CONST(0.005619067233056), REAL_CONST(0.022281449288130), REAL_CONST(0.086156636476517), REAL_CONST(0.304854571819305), REAL_CONST(0.847996890544891), REAL_CONST(1.584962487220764), REAL_CONST(2.070389270782471), REAL_CONST(2.252387046813965), REAL_CONST(2.304061651229858), REAL_CONST(2.317430257797241), REAL_CONST(2.320801734924316), REAL_CONST(2.321646213531494) },
  355.     { REAL_CONST(0.000704097095877), REAL_CONST(0.002812269143760), REAL_CONST(0.011183738708496), REAL_CONST(0.043721374124289), REAL_CONST(0.160464659333229), REAL_CONST(0.485426813364029), REAL_CONST(1.000000000000000), REAL_CONST(1.378511548042297), REAL_CONST(1.527246952056885), REAL_CONST(1.570089221000671), REAL_CONST(1.581215262413025), REAL_CONST(1.584023833274841), REAL_CONST(1.584727644920349) },
  356.     { REAL_CONST(0.000352177477907), REAL_CONST(0.001406819908880), REAL_CONST(0.005602621007711), REAL_CONST(0.022026389837265), REAL_CONST(0.082462236285210), REAL_CONST(0.263034462928772), REAL_CONST(0.584962487220764), REAL_CONST(0.847996890544891), REAL_CONST(0.956931233406067), REAL_CONST(0.988859415054321), REAL_CONST(0.997190535068512), REAL_CONST(0.999296069145203), REAL_CONST(0.999823868274689) },
  357.     { REAL_CONST(0.000176099492819), REAL_CONST(0.000703581434209), REAL_CONST(0.002804030198604), REAL_CONST(0.011055230163038), REAL_CONST(0.041820213198662), REAL_CONST(0.137503549456596), REAL_CONST(0.321928083896637), REAL_CONST(0.485426813364029), REAL_CONST(0.556393325328827), REAL_CONST(0.577544987201691), REAL_CONST(0.583090126514435), REAL_CONST(0.584493279457092), REAL_CONST(0.584845066070557) },
  358.     { REAL_CONST(0.000088052431238), REAL_CONST(0.000351833587047), REAL_CONST(0.001402696361765), REAL_CONST(0.005538204684854), REAL_CONST(0.021061634644866), REAL_CONST(0.070389263331890), REAL_CONST(0.169925004243851), REAL_CONST(0.263034462928772), REAL_CONST(0.304854571819305), REAL_CONST(0.317482173442841), REAL_CONST(0.320804953575134), REAL_CONST(0.321646571159363), REAL_CONST(0.321857661008835) },
  359.     { REAL_CONST(0.000044026888645), REAL_CONST(0.000175927518285), REAL_CONST(0.000701518612914), REAL_CONST(0.002771759871393), REAL_CONST(0.010569252073765), REAL_CONST(0.035623874515295), REAL_CONST(0.087462842464447), REAL_CONST(0.137503549456596), REAL_CONST(0.160464659333229), REAL_CONST(0.167456731200218), REAL_CONST(0.169301137328148), REAL_CONST(0.169768601655960), REAL_CONST(0.169885858893394) },
  360.     { REAL_CONST(0.000022013611670), REAL_CONST(0.000088052431238), REAL_CONST(0.000350801943569), REAL_CONST(0.001386545598507), REAL_CONST(0.005294219125062), REAL_CONST(0.017921976745129), REAL_CONST(0.044394120573997), REAL_CONST(0.070389263331890), REAL_CONST(0.082462236285210), REAL_CONST(0.086156636476517), REAL_CONST(0.087132595479488), REAL_CONST(0.087379962205887), REAL_CONST(0.087442122399807) },
  361.     { REAL_CONST(0.000011006847672), REAL_CONST(0.000044026888645), REAL_CONST(0.000175411638338), REAL_CONST(0.000693439331371), REAL_CONST(0.002649537986144), REAL_CONST(0.008988817222416), REAL_CONST(0.022367812693119), REAL_CONST(0.035623874515295), REAL_CONST(0.041820213198662), REAL_CONST(0.043721374124289), REAL_CONST(0.044224001467228), REAL_CONST(0.044351425021887), REAL_CONST(0.044383447617292) },
  362.     { REAL_CONST(0.000005503434295), REAL_CONST(0.000022013611670), REAL_CONST(0.000087708482170), REAL_CONST(0.000346675369656), REAL_CONST(0.001325377263129), REAL_CONST(0.004501323681325), REAL_CONST(0.011227255687118), REAL_CONST(0.017921976745129), REAL_CONST(0.021061634644866), REAL_CONST(0.022026389837265), REAL_CONST(0.022281449288130), REAL_CONST(0.022346137091517), REAL_CONST(0.022362394258380) },
  363.     { REAL_CONST(0.000002751719876), REAL_CONST(0.000011006847672), REAL_CONST(0.000043854910473), REAL_CONST(0.000173348103999), REAL_CONST(0.000662840844598), REAL_CONST(0.002252417383716), REAL_CONST(0.005624548997730), REAL_CONST(0.008988817222416), REAL_CONST(0.010569252073765), REAL_CONST(0.011055230163038), REAL_CONST(0.011183738708496), REAL_CONST(0.011216334067285), REAL_CONST(0.011224525049329) },
  364.     { REAL_CONST(0.000001375860506), REAL_CONST(0.000005503434295), REAL_CONST(0.000022013611670), REAL_CONST(0.000086676649516), REAL_CONST(0.000331544462824), REAL_CONST(0.001126734190620), REAL_CONST(0.002815015614033), REAL_CONST(0.004501323681325), REAL_CONST(0.005294219125062), REAL_CONST(0.005538204684854), REAL_CONST(0.005602621007711), REAL_CONST(0.005619067233056), REAL_CONST(0.005623178556561) },
  365.     { REAL_CONST(0.000000687930424), REAL_CONST(0.000002751719876), REAL_CONST(0.000011006847672), REAL_CONST(0.000043338975956), REAL_CONST(0.000165781748365), REAL_CONST(0.000563477107789), REAL_CONST(0.001408194424585), REAL_CONST(0.002252417383716), REAL_CONST(0.002649537986144), REAL_CONST(0.002771759871393), REAL_CONST(0.002804030198604), REAL_CONST(0.002812269143760), REAL_CONST(0.002814328996465) },
  366.     { REAL_CONST(0.000000343965269), REAL_CONST(0.000001375860506), REAL_CONST(0.000005503434295), REAL_CONST(0.000021669651687), REAL_CONST(0.000082893253420), REAL_CONST(0.000281680084299), REAL_CONST(0.000704268983100), REAL_CONST(0.001126734190620), REAL_CONST(0.001325377263129), REAL_CONST(0.001386545598507), REAL_CONST(0.001402696361765), REAL_CONST(0.001406819908880), REAL_CONST(0.001407850766554) },
  367.     { REAL_CONST(0.000000171982634), REAL_CONST(0.000000687930424), REAL_CONST(0.000002751719876), REAL_CONST(0.000010834866771), REAL_CONST(0.000041447223339), REAL_CONST(0.000140846910654), REAL_CONST(0.000352177477907), REAL_CONST(0.000563477107789), REAL_CONST(0.000662840844598), REAL_CONST(0.000693439331371), REAL_CONST(0.000701518612914), REAL_CONST(0.000703581434209), REAL_CONST(0.000704097095877) },
  368.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000343965269), REAL_CONST(0.000001375860506), REAL_CONST(0.000005503434295), REAL_CONST(0.000020637769921), REAL_CONST(0.000070511166996), REAL_CONST(0.000176099492819), REAL_CONST(0.000281680084299), REAL_CONST(0.000331544462824), REAL_CONST(0.000346675369656), REAL_CONST(0.000350801943569), REAL_CONST(0.000351833587047), REAL_CONST(0.000352177477907) },
  369.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000687930424), REAL_CONST(0.000002751719876), REAL_CONST(0.000010318922250), REAL_CONST(0.000035256012779), REAL_CONST(0.000088052431238), REAL_CONST(0.000140846910654), REAL_CONST(0.000165781748365), REAL_CONST(0.000173348103999), REAL_CONST(0.000175411638338), REAL_CONST(0.000175927518285), REAL_CONST(0.000176099492819) },
  370.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000343965269), REAL_CONST(0.000001375860506), REAL_CONST(0.000005159470220), REAL_CONST(0.000017542124624), REAL_CONST(0.000044026888645), REAL_CONST(0.000070511166996), REAL_CONST(0.000082893253420), REAL_CONST(0.000086676649516), REAL_CONST(0.000087708482170), REAL_CONST(0.000088052431238), REAL_CONST(0.000088052431238) },
  371.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000687930424), REAL_CONST(0.000002579737384), REAL_CONST(0.000008771088687), REAL_CONST(0.000022013611670), REAL_CONST(0.000035256012779), REAL_CONST(0.000041447223339), REAL_CONST(0.000043338975956), REAL_CONST(0.000043854910473), REAL_CONST(0.000044026888645), REAL_CONST(0.000044026888645) },
  372.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000343965269), REAL_CONST(0.000001375860506), REAL_CONST(0.000004471542070), REAL_CONST(0.000011006847672), REAL_CONST(0.000017542124624), REAL_CONST(0.000020637769921), REAL_CONST(0.000021669651687), REAL_CONST(0.000022013611670), REAL_CONST(0.000022013611670), REAL_CONST(0.000022013611670) },
  373.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000687930424), REAL_CONST(0.000002235772627), REAL_CONST(0.000005503434295), REAL_CONST(0.000008771088687), REAL_CONST(0.000010318922250), REAL_CONST(0.000010834866771), REAL_CONST(0.000011006847672), REAL_CONST(0.000011006847672), REAL_CONST(0.000011006847672) },
  374.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000343965269), REAL_CONST(0.000001031895522), REAL_CONST(0.000002751719876), REAL_CONST(0.000004471542070), REAL_CONST(0.000005159470220), REAL_CONST(0.000005503434295), REAL_CONST(0.000005503434295), REAL_CONST(0.000005503434295), REAL_CONST(0.000005503434295) },
  375.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000515947875), REAL_CONST(0.000001375860506), REAL_CONST(0.000002235772627), REAL_CONST(0.000002579737384), REAL_CONST(0.000002751719876), REAL_CONST(0.000002751719876), REAL_CONST(0.000002751719876), REAL_CONST(0.000002751719876) },
  376.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000343965269), REAL_CONST(0.000000687930424), REAL_CONST(0.000001031895522), REAL_CONST(0.000001375860506), REAL_CONST(0.000001375860506), REAL_CONST(0.000001375860506), REAL_CONST(0.000001375860506), REAL_CONST(0.000001375860506) },
  377.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000343965269), REAL_CONST(0.000000515947875), REAL_CONST(0.000000687930424), REAL_CONST(0.000000687930424), REAL_CONST(0.000000687930424), REAL_CONST(0.000000687930424), REAL_CONST(0.000000687930424) },
  378.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000343965269), REAL_CONST(0.000000343965269), REAL_CONST(0.000000343965269), REAL_CONST(0.000000343965269), REAL_CONST(0.000000343965269), REAL_CONST(0.000000343965269) },
  379.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000171982634), REAL_CONST(0.000000171982634), REAL_CONST(0.000000171982634), REAL_CONST(0.000000171982634), REAL_CONST(0.000000171982634) }
  380. };
  382. static const real_t log_Qplus1[31] = {
  383.     REAL_CONST(6.022367813028454), REAL_CONST(5.044394119358453), REAL_CONST(4.087462841250339), 
  384.     REAL_CONST(3.169925001442313), REAL_CONST(2.321928094887362), REAL_CONST(1.584962500721156), 
  385.     REAL_CONST(1.000000000000000), REAL_CONST(0.584962500721156), REAL_CONST(0.321928094887362), 
  386.     REAL_CONST(0.169925001442312), REAL_CONST(0.087462841250339), REAL_CONST(0.044394119358453), 
  387.     REAL_CONST(0.022367813028455), REAL_CONST(0.011227255423254), REAL_CONST(0.005624549193878), 
  388.     REAL_CONST(0.002815015607054), REAL_CONST(0.001408194392808), REAL_CONST(0.000704269011247), 
  389.     REAL_CONST(0.000352177480301), REAL_CONST(0.000176099486443), REAL_CONST(0.000088052430122), 
  390.     REAL_CONST(0.000044026886827), REAL_CONST(0.000022013611360), REAL_CONST(0.000011006847667), 
  391.     REAL_CONST(0.000005503434331), REAL_CONST(0.000002751719790), REAL_CONST(0.000001375860551), 
  392.     REAL_CONST(0.000000687930439), REAL_CONST(0.000000343965261), REAL_CONST(0.000000171982641), 
  393.     REAL_CONST(0.000000000000000)
  394. };
  396. static real_t find_log2_Qplus1(sbr_info *sbr, uint8_t k, uint8_t l, uint8_t ch)
  397. {
  398.     /* check for coupled energy/noise data */
  399.     if (sbr->bs_coupling == 1)
  400.     {
  401.         if ((sbr->Q[0][k][l] >= 0) && (sbr->Q[0][k][l] <= 30) &&
  402.             (sbr->Q[1][k][l] >= 0) && (sbr->Q[1][k][l] <= 24))
  403.         {
  404.             if (ch == 0)
  405.             {
  406.                 return log_Qplus1_pan[sbr->Q[0][k][l]][sbr->Q[1][k][l] >> 1];
  407.             } else {
  408.                 return log_Qplus1_pan[sbr->Q[0][k][l]][12 - (sbr->Q[1][k][l] >> 1)];
  409.             }
  410.         } else {
  411.             return 0;
  412.         }
  413.     } else {
  414.         if (sbr->Q[ch][k][l] >= 0 && sbr->Q[ch][k][l] <= 30)
  415.         {
  416.             return log_Qplus1[sbr->Q[ch][k][l]];
  417.         } else {
  418.             return 0;
  419.         }
  420.     }
  421. }
  423. static void calculate_gain(sbr_info *sbr, sbr_hfadj_info *adj, uint8_t ch)
  424. {
  425.     /* log2 values of limiter gains */
  426.     static const real_t limGain[] = {
  427.         REAL_CONST(-1.0), REAL_CONST(0.0), REAL_CONST(1.0), REAL_CONST(33.219)
  428.     };
  429.     uint8_t m, l, k;
  431.     uint8_t current_t_noise_band = 0;
  432.     uint8_t S_mapped;
  434.     ALIGN real_t Q_M_lim[MAX_M];
  435.     ALIGN real_t G_lim[MAX_M];
  436.     ALIGN real_t G_boost;
  437.     ALIGN real_t S_M[MAX_M];
  440.     for (l = 0; l < sbr->L_E[ch]; l++)
  441.     {
  442.         uint8_t current_f_noise_band = 0;
  443.         uint8_t current_res_band = 0;
  444.         uint8_t current_res_band2 = 0;
  445.         uint8_t current_hi_res_band = 0;
  447.         real_t delta = (l == sbr->l_A[ch] || l == sbr->prevEnvIsShort[ch]) ? 0 : 1;
  449.         S_mapped = get_S_mapped(sbr, ch, l, current_res_band2);
  451.         if (sbr->t_E[ch][l+1] > sbr->t_Q[ch][current_t_noise_band+1])
  452.         {
  453.             current_t_noise_band++;
  454.         }
  456.         for (k = 0; k < sbr->N_L[sbr->bs_limiter_bands]; k++)
  457.         {
  458.             real_t Q_M = 0;
  459.             real_t G_max;
  460.             real_t den = 0;
  461.             real_t acc1 = 0;
  462.             real_t acc2 = 0;
  463.             uint8_t current_res_band_size = 0;
  464.             uint8_t Q_M_size = 0;
  466.             uint8_t ml1, ml2;
  468.             /* bounds of current limiter bands */
  469.             ml1 = sbr->f_table_lim[sbr->bs_limiter_bands][k];
  470.             ml2 = sbr->f_table_lim[sbr->bs_limiter_bands][k+1];
  473.             /* calculate the accumulated E_orig and E_curr over the limiter band */
  474.             for (m = ml1; m < ml2; m++)
  475.             {
  476.                 if ((m + sbr->kx) < sbr->f_table_res[sbr->f[ch][l]][current_res_band+1])
  477.                 {
  478.                     current_res_band_size++;
  479.                 } else {
  480.                     acc1 += pow2_int(-REAL_CONST(10) + log2_int_tab[current_res_band_size] + find_log2_E(sbr, current_res_band, l, ch));
  482.                     current_res_band++;
  483.                     current_res_band_size = 1;
  484.                 }
  486.                 acc2 += sbr->E_curr[ch][m][l];
  487.             }
  488.             acc1 += pow2_int(-REAL_CONST(10) + log2_int_tab[current_res_band_size] + find_log2_E(sbr, current_res_band, l, ch));
  491.             if (acc1 == 0)
  492.                 acc1 = LOG2_MIN_INF;
  493.             else
  494.                 acc1 = log2_int(acc1);
  497.             /* calculate the maximum gain */
  498.             /* ratio of the energy of the original signal and the energy
  499.              * of the HF generated signal
  500.              */
  501.             G_max = acc1 - log2_int(acc2) + limGain[sbr->bs_limiter_gains];
  502.             G_max = min(G_max, limGain[3]);
  505.             for (m = ml1; m < ml2; m++)
  506.             {
  507.                 real_t G;
  508.                 real_t E_curr, E_orig;
  509.                 real_t Q_orig, Q_orig_plus1;
  510.                 uint8_t S_index_mapped;
  513.                 /* check if m is on a noise band border */
  514.                 if ((m + sbr->kx) == sbr->f_table_noise[current_f_noise_band+1])
  515.                 {
  516.                     /* step to next noise band */
  517.                     current_f_noise_band++;
  518.                 }
  521.                 /* check if m is on a resolution band border */
  522.                 if ((m + sbr->kx) == sbr->f_table_res[sbr->f[ch][l]][current_res_band2+1])
  523.                 {
  524.                     /* accumulate a whole range of equal Q_Ms */
  525.                     if (Q_M_size > 0)
  526.                         den += pow2_int(log2_int_tab[Q_M_size] + Q_M);
  527.                     Q_M_size = 0;
  529.                     /* step to next resolution band */
  530.                     current_res_band2++;
  532.                     /* if we move to a new resolution band, we should check if we are
  533.                      * going to add a sinusoid in this band
  534.                      */
  535.                     S_mapped = get_S_mapped(sbr, ch, l, current_res_band2);
  536.                 }
  539.                 /* check if m is on a HI_RES band border */
  540.                 if ((m + sbr->kx) == sbr->f_table_res[HI_RES][current_hi_res_band+1])
  541.                 {
  542.                     /* step to next HI_RES band */
  543.                     current_hi_res_band++;
  544.                 }
  547.                 /* find S_index_mapped
  548.                  * S_index_mapped can only be 1 for the m in the middle of the
  549.                  * current HI_RES band
  550.                  */
  551.                 S_index_mapped = 0;
  552.                 if ((l >= sbr->l_A[ch]) ||
  553.                     (sbr->bs_add_harmonic_prev[ch][current_hi_res_band] && sbr->bs_add_harmonic_flag_prev[ch]))
  554.                 {
  555.                     /* find the middle subband of the HI_RES frequency band */
  556.                     if ((m + sbr->kx) == (sbr->f_table_res[HI_RES][current_hi_res_band+1] + sbr->f_table_res[HI_RES][current_hi_res_band]) >> 1)
  557.                         S_index_mapped = sbr->bs_add_harmonic[ch][current_hi_res_band];
  558.                 }
  561.                 /* find bitstream parameters */
  562.                 if (sbr->E_curr[ch][m][l] == 0)
  563.                     E_curr = LOG2_MIN_INF;
  564.                 else
  565.                     E_curr = log2_int(sbr->E_curr[ch][m][l]);
  566.                 E_orig = -REAL_CONST(10) + find_log2_E(sbr, current_res_band2, l, ch);
  569.                 Q_orig = find_log2_Q(sbr, current_f_noise_band, current_t_noise_band, ch);
  570.                 Q_orig_plus1 = find_log2_Qplus1(sbr, current_f_noise_band, current_t_noise_band, ch);
  573.                 /* Q_M only depends on E_orig and Q_div2:
  574.                  * since N_Q <= N_Low <= N_High we only need to recalculate Q_M on
  575.                  * a change of current res band (HI or LO)
  576.                  */
  577.                 Q_M = E_orig + Q_orig - Q_orig_plus1;
  580.                 /* S_M only depends on E_orig, Q_div and S_index_mapped:
  581.                  * S_index_mapped can only be non-zero once per HI_RES band
  582.                  */
  583.                 if (S_index_mapped == 0)
  584.                 {
  585.                     S_M[m] = LOG2_MIN_INF; /* -inf */
  586.                 } else {
  587.                     S_M[m] = E_orig - Q_orig_plus1;
  589.                     /* accumulate sinusoid part of the total energy */
  590.                     den += pow2_int(S_M[m]);
  591.                 }
  594.                 /* calculate gain */
  595.                 /* ratio of the energy of the original signal and the energy
  596.                  * of the HF generated signal
  597.                  */
  598.                 /* E_curr here is officially E_curr+1 so the log2() of that can never be < 0 */
  599.                 /* scaled by -10 */
  600.                 G = E_orig - max(-REAL_CONST(10), E_curr);
  601.                 if ((S_mapped == 0) && (delta == 1))
  602.                 {
  603.                     /* G = G * 1/(1+Q) */
  604.                     G -= Q_orig_plus1;
  605.                 } else if (S_mapped == 1) {
  606.                     /* G = G * Q/(1+Q) */
  607.                     G += Q_orig - Q_orig_plus1;
  608.                 }
  611.                 /* limit the additional noise energy level */
  612.                 /* and apply the limiter */
  613.                 if (G_max > G)
  614.                 {
  615.                     Q_M_lim[m] = Q_M;
  616.                     G_lim[m] = G;
  618.                     if ((S_index_mapped == 0) && (l != sbr->l_A[ch]))
  619.                     {
  620.                         Q_M_size++;
  621.                     }
  622.                 } else {
  623.                     /* G > G_max */
  624.                     Q_M_lim[m] = Q_M + G_max - G;
  625.                     G_lim[m] = G_max;
  627.                     /* accumulate limited Q_M */
  628.                     if ((S_index_mapped == 0) && (l != sbr->l_A[ch]))
  629.                     {
  630.                         den += pow2_int(Q_M_lim[m]);
  631.                     }
  632.                 }
  635.                 /* accumulate the total energy */
  636.                 /* E_curr changes for every m so we do need to accumulate every m */
  637.                 den += pow2_int(E_curr + G_lim[m]);
  638.             }
  640.             /* accumulate last range of equal Q_Ms */
  641.             if (Q_M_size > 0)
  642.             {
  643.                 den += pow2_int(log2_int_tab[Q_M_size] + Q_M);
  644.             }
  647.             /* calculate the final gain */
  648.             /* G_boost: [0..2.51188643] */
  649.             G_boost = acc1 - log2_int(den /*+ EPS*/);
  650.             G_boost = min(G_boost, REAL_CONST(1.328771237) /* log2(1.584893192 ^ 2) */);
  653.             for (m = ml1; m < ml2; m++)
  654.             {
  655.                 /* apply compensation to gain, noise floor sf's and sinusoid levels */
  656. #ifndef SBR_LOW_POWER
  657.                 adj->G_lim_boost[l][m] = pow2_fix((G_lim[m] + G_boost) >> 1);
  658. #else
  659.                 /* sqrt() will be done after the aliasing reduction to save a
  660.                  * few multiplies
  661.                  */
  662.                 adj->G_lim_boost[l][m] = pow2_fix(G_lim[m] + G_boost);
  663. #endif
  664.                 adj->Q_M_lim_boost[l][m] = pow2_fix((Q_M_lim[m] + G_boost) >> 1);
  666.                 if (S_M[m] != LOG2_MIN_INF)
  667.                 {
  668.                     adj->S_M_boost[l][m] = pow2_int((S_M[m] + G_boost) >> 1);
  669.                 } else {
  670.                     adj->S_M_boost[l][m] = 0;
  671.                 }
  672.             }
  673.         }
  674.     }
  675. }
  677. #else
  679. //#define LOG2_TEST
  681. #ifdef LOG2_TEST
  683. #define LOG2_MIN_INF -100000
  685. __inline float pow2(float val)
  686. {
  687.     return pow(2.0, val);
  688. }
  689. __inline float log2(float val)
  690. {
  691.     return log(val)/log(2.0);
  692. }
  694. #define RB 14
  696. float QUANTISE2REAL(float val)
  697. {
  698.     __int32 ival = (__int32)(val * (1<<RB));
  699.     return (float)ival / (float)((1<<RB));
  700. }
  702. float QUANTISE2INT(float val)
  703. {
  704.     return floor(val);
  705. }
  707. /* log2 values of [0..63] */
  708. static const real_t log2_int_tab[] = {
  709.     LOG2_MIN_INF,      0.000000000000000, 1.000000000000000, 1.584962500721156,
  710.     2.000000000000000, 2.321928094887362, 2.584962500721156, 2.807354922057604,
  711.     3.000000000000000, 3.169925001442313, 3.321928094887363, 3.459431618637297,
  712.     3.584962500721156, 3.700439718141092, 3.807354922057604, 3.906890595608519,
  713.     4.000000000000000, 4.087462841250339, 4.169925001442312, 4.247927513443585,
  714.     4.321928094887362, 4.392317422778761, 4.459431618637297, 4.523561956057013,
  715.     4.584962500721156, 4.643856189774724, 4.700439718141093, 4.754887502163468,
  716.     4.807354922057604, 4.857980995127572, 4.906890595608519, 4.954196310386875,
  717.     5.000000000000000, 5.044394119358453, 5.087462841250340, 5.129283016944966,
  718.     5.169925001442312, 5.209453365628949, 5.247927513443585, 5.285402218862248,
  719.     5.321928094887363, 5.357552004618084, 5.392317422778761, 5.426264754702098,
  720.     5.459431618637297, 5.491853096329675, 5.523561956057013, 5.554588851677637,
  721.     5.584962500721156, 5.614709844115208, 5.643856189774724, 5.672425341971495,
  722.     5.700439718141093, 5.727920454563200, 5.754887502163469, 5.781359713524660,
  723.     5.807354922057605, 5.832890014164742, 5.857980995127572, 5.882643049361842,
  724.     5.906890595608518, 5.930737337562887, 5.954196310386876, 5.977279923499916
  725. };
  727. static const real_t pan_log2_tab[] = {
  728.     1.000000000000000, 0.584962500721156, 0.321928094887362, 0.169925001442312, 0.087462841250339,
  729.     0.044394119358453, 0.022367813028455, 0.011227255423254, 0.005624549193878, 0.002815015607054,
  730.     0.001408194392808, 0.000704269011247, 0.000352177480301, 0.000176099486443, 0.000088052430122,
  731.     0.000044026886827, 0.000022013611360, 0.000011006847667
  732. };
  734. static real_t find_log2_E(sbr_info *sbr, uint8_t k, uint8_t l, uint8_t ch)
  735. {
  736.     /* check for coupled energy/noise data */
  737.     if (sbr->bs_coupling == 1)
  738.     {
  739.         real_t amp0 = (sbr->amp_res[0]) ? 1.0 : 0.5;
  740.         real_t amp1 = (sbr->amp_res[1]) ? 1.0 : 0.5;
  741.         float tmp = QUANTISE2REAL(7.0 + (real_t)sbr->E[0][k][l] * amp0);
  742.         float pan;
  744.         int E = (int)(sbr->E[1][k][l] * amp1);
  746.         if (ch == 0)
  747.         {
  748.             if (E > 12)
  749.             {
  750.                 /* negative */
  751.                 pan = QUANTISE2REAL(pan_log2_tab[-12 + E]);
  752.             } else {
  753.                 /* positive */
  754.                 pan = QUANTISE2REAL(pan_log2_tab[12 - E] + (12 - E));
  755.             }
  756.         } else {
  757.             if (E < 12)
  758.             {
  759.                 /* negative */
  760.                 pan = QUANTISE2REAL(pan_log2_tab[-E + 12]);
  761.             } else {
  762.                 /* positive */
  763.                 pan = QUANTISE2REAL(pan_log2_tab[E - 12] + (E - 12));
  764.             }
  765.         }
  767.         /* tmp / pan in log2 */
  768.         return QUANTISE2REAL(tmp - pan);
  769.     } else {
  770.         real_t amp = (sbr->amp_res[ch]) ? 1.0 : 0.5;
  772.         return QUANTISE2REAL(6.0 + (real_t)sbr->E[ch][k][l] * amp);
  773.     }
  774. }
  776. static real_t find_log2_Q(sbr_info *sbr, uint8_t k, uint8_t l, uint8_t ch)
  777. {
  778.     /* check for coupled energy/noise data */
  779.     if (sbr->bs_coupling == 1)
  780.     {
  781.         float tmp = QUANTISE2REAL(7.0 - (real_t)sbr->Q[0][k][l]);
  782.         float pan;
  784.         int Q = (int)(sbr->Q[1][k][l]);
  786.         if (ch == 0)
  787.         {
  788.             if (Q > 12)
  789.             {
  790.                 /* negative */
  791.                 pan = QUANTISE2REAL(pan_log2_tab[-12 + Q]);
  792.             } else {
  793.                 /* positive */
  794.                 pan = QUANTISE2REAL(pan_log2_tab[12 - Q] + (12 - Q));
  795.             }
  796.         } else {
  797.             if (Q < 12)
  798.             {
  799.                 /* negative */
  800.                 pan = QUANTISE2REAL(pan_log2_tab[-Q + 12]);
  801.             } else {
  802.                 /* positive */
  803.                 pan = QUANTISE2REAL(pan_log2_tab[Q - 12] + (Q - 12));
  804.             }
  805.         }
  807.         /* tmp / pan in log2 */
  808.         return QUANTISE2REAL(tmp - pan);
  809.     } else {
  810.         return QUANTISE2REAL(6.0 - (real_t)sbr->Q[ch][k][l]);
  811.     }
  812. }
  814. static const real_t log_Qplus1_pan[31][13] = {
  815.     { REAL_CONST(0.044383447617292), REAL_CONST(0.169768601655960), REAL_CONST(0.583090126514435), REAL_CONST(1.570089221000671), REAL_CONST(3.092446088790894), REAL_CONST(4.733354568481445), REAL_CONST(6.022367954254150), REAL_CONST(6.692092418670654), REAL_CONST(6.924463272094727), REAL_CONST(6.989034175872803), REAL_CONST(7.005646705627441), REAL_CONST(7.009829998016357), REAL_CONST(7.010877609252930) },
  816.     { REAL_CONST(0.022362394258380), REAL_CONST(0.087379962205887), REAL_CONST(0.320804953575134), REAL_CONST(0.988859415054321), REAL_CONST(2.252387046813965), REAL_CONST(3.786596298217773), REAL_CONST(5.044394016265869), REAL_CONST(5.705977916717529), REAL_CONST(5.936291694641113), REAL_CONST(6.000346660614014), REAL_CONST(6.016829967498779), REAL_CONST(6.020981311798096), REAL_CONST(6.022020816802979) },
  817.     { REAL_CONST(0.011224525049329), REAL_CONST(0.044351425021887), REAL_CONST(0.169301137328148), REAL_CONST(0.577544987201691), REAL_CONST(1.527246952056885), REAL_CONST(2.887525320053101), REAL_CONST(4.087462902069092), REAL_CONST(4.733354568481445), REAL_CONST(4.959661006927490), REAL_CONST(5.022709369659424), REAL_CONST(5.038940429687500), REAL_CONST(5.043028831481934), REAL_CONST(5.044052600860596) },
  818.     { REAL_CONST(0.005623178556561), REAL_CONST(0.022346137091517), REAL_CONST(0.087132595479488), REAL_CONST(0.317482173442841), REAL_CONST(0.956931233406067), REAL_CONST(2.070389270782471), REAL_CONST(3.169924974441528), REAL_CONST(3.786596298217773), REAL_CONST(4.005294322967529), REAL_CONST(4.066420555114746), REAL_CONST(4.082170009613037), REAL_CONST(4.086137294769287), REAL_CONST(4.087131500244141) },
  819.     { REAL_CONST(0.002814328996465), REAL_CONST(0.011216334067285), REAL_CONST(0.044224001467228), REAL_CONST(0.167456731200218), REAL_CONST(0.556393325328827), REAL_CONST(1.378511548042297), REAL_CONST(2.321928024291992), REAL_CONST(2.887525320053101), REAL_CONST(3.092446088790894), REAL_CONST(3.150059700012207), REAL_CONST(3.164926528930664), REAL_CONST(3.168673276901245), REAL_CONST(3.169611930847168) },
  820.     { REAL_CONST(0.001407850766554), REAL_CONST(0.005619067233056), REAL_CONST(0.022281449288130), REAL_CONST(0.086156636476517), REAL_CONST(0.304854571819305), REAL_CONST(0.847996890544891), REAL_CONST(1.584962487220764), REAL_CONST(2.070389270782471), REAL_CONST(2.252387046813965), REAL_CONST(2.304061651229858), REAL_CONST(2.317430257797241), REAL_CONST(2.320801734924316), REAL_CONST(2.321646213531494) },
  821.     { REAL_CONST(0.000704097095877), REAL_CONST(0.002812269143760), REAL_CONST(0.011183738708496), REAL_CONST(0.043721374124289), REAL_CONST(0.160464659333229), REAL_CONST(0.485426813364029), REAL_CONST(1.000000000000000), REAL_CONST(1.378511548042297), REAL_CONST(1.527246952056885), REAL_CONST(1.570089221000671), REAL_CONST(1.581215262413025), REAL_CONST(1.584023833274841), REAL_CONST(1.584727644920349) },
  822.     { REAL_CONST(0.000352177477907), REAL_CONST(0.001406819908880), REAL_CONST(0.005602621007711), REAL_CONST(0.022026389837265), REAL_CONST(0.082462236285210), REAL_CONST(0.263034462928772), REAL_CONST(0.584962487220764), REAL_CONST(0.847996890544891), REAL_CONST(0.956931233406067), REAL_CONST(0.988859415054321), REAL_CONST(0.997190535068512), REAL_CONST(0.999296069145203), REAL_CONST(0.999823868274689) },
  823.     { REAL_CONST(0.000176099492819), REAL_CONST(0.000703581434209), REAL_CONST(0.002804030198604), REAL_CONST(0.011055230163038), REAL_CONST(0.041820213198662), REAL_CONST(0.137503549456596), REAL_CONST(0.321928083896637), REAL_CONST(0.485426813364029), REAL_CONST(0.556393325328827), REAL_CONST(0.577544987201691), REAL_CONST(0.583090126514435), REAL_CONST(0.584493279457092), REAL_CONST(0.584845066070557) },
  824.     { REAL_CONST(0.000088052431238), REAL_CONST(0.000351833587047), REAL_CONST(0.001402696361765), REAL_CONST(0.005538204684854), REAL_CONST(0.021061634644866), REAL_CONST(0.070389263331890), REAL_CONST(0.169925004243851), REAL_CONST(0.263034462928772), REAL_CONST(0.304854571819305), REAL_CONST(0.317482173442841), REAL_CONST(0.320804953575134), REAL_CONST(0.321646571159363), REAL_CONST(0.321857661008835) },
  825.     { REAL_CONST(0.000044026888645), REAL_CONST(0.000175927518285), REAL_CONST(0.000701518612914), REAL_CONST(0.002771759871393), REAL_CONST(0.010569252073765), REAL_CONST(0.035623874515295), REAL_CONST(0.087462842464447), REAL_CONST(0.137503549456596), REAL_CONST(0.160464659333229), REAL_CONST(0.167456731200218), REAL_CONST(0.169301137328148), REAL_CONST(0.169768601655960), REAL_CONST(0.169885858893394) },
  826.     { REAL_CONST(0.000022013611670), REAL_CONST(0.000088052431238), REAL_CONST(0.000350801943569), REAL_CONST(0.001386545598507), REAL_CONST(0.005294219125062), REAL_CONST(0.017921976745129), REAL_CONST(0.044394120573997), REAL_CONST(0.070389263331890), REAL_CONST(0.082462236285210), REAL_CONST(0.086156636476517), REAL_CONST(0.087132595479488), REAL_CONST(0.087379962205887), REAL_CONST(0.087442122399807) },
  827.     { REAL_CONST(0.000011006847672), REAL_CONST(0.000044026888645), REAL_CONST(0.000175411638338), REAL_CONST(0.000693439331371), REAL_CONST(0.002649537986144), REAL_CONST(0.008988817222416), REAL_CONST(0.022367812693119), REAL_CONST(0.035623874515295), REAL_CONST(0.041820213198662), REAL_CONST(0.043721374124289), REAL_CONST(0.044224001467228), REAL_CONST(0.044351425021887), REAL_CONST(0.044383447617292) },
  828.     { REAL_CONST(0.000005503434295), REAL_CONST(0.000022013611670), REAL_CONST(0.000087708482170), REAL_CONST(0.000346675369656), REAL_CONST(0.001325377263129), REAL_CONST(0.004501323681325), REAL_CONST(0.011227255687118), REAL_CONST(0.017921976745129), REAL_CONST(0.021061634644866), REAL_CONST(0.022026389837265), REAL_CONST(0.022281449288130), REAL_CONST(0.022346137091517), REAL_CONST(0.022362394258380) },
  829.     { REAL_CONST(0.000002751719876), REAL_CONST(0.000011006847672), REAL_CONST(0.000043854910473), REAL_CONST(0.000173348103999), REAL_CONST(0.000662840844598), REAL_CONST(0.002252417383716), REAL_CONST(0.005624548997730), REAL_CONST(0.008988817222416), REAL_CONST(0.010569252073765), REAL_CONST(0.011055230163038), REAL_CONST(0.011183738708496), REAL_CONST(0.011216334067285), REAL_CONST(0.011224525049329) },
  830.     { REAL_CONST(0.000001375860506), REAL_CONST(0.000005503434295), REAL_CONST(0.000022013611670), REAL_CONST(0.000086676649516), REAL_CONST(0.000331544462824), REAL_CONST(0.001126734190620), REAL_CONST(0.002815015614033), REAL_CONST(0.004501323681325), REAL_CONST(0.005294219125062), REAL_CONST(0.005538204684854), REAL_CONST(0.005602621007711), REAL_CONST(0.005619067233056), REAL_CONST(0.005623178556561) },
  831.     { REAL_CONST(0.000000687930424), REAL_CONST(0.000002751719876), REAL_CONST(0.000011006847672), REAL_CONST(0.000043338975956), REAL_CONST(0.000165781748365), REAL_CONST(0.000563477107789), REAL_CONST(0.001408194424585), REAL_CONST(0.002252417383716), REAL_CONST(0.002649537986144), REAL_CONST(0.002771759871393), REAL_CONST(0.002804030198604), REAL_CONST(0.002812269143760), REAL_CONST(0.002814328996465) },
  832.     { REAL_CONST(0.000000343965269), REAL_CONST(0.000001375860506), REAL_CONST(0.000005503434295), REAL_CONST(0.000021669651687), REAL_CONST(0.000082893253420), REAL_CONST(0.000281680084299), REAL_CONST(0.000704268983100), REAL_CONST(0.001126734190620), REAL_CONST(0.001325377263129), REAL_CONST(0.001386545598507), REAL_CONST(0.001402696361765), REAL_CONST(0.001406819908880), REAL_CONST(0.001407850766554) },
  833.     { REAL_CONST(0.000000171982634), REAL_CONST(0.000000687930424), REAL_CONST(0.000002751719876), REAL_CONST(0.000010834866771), REAL_CONST(0.000041447223339), REAL_CONST(0.000140846910654), REAL_CONST(0.000352177477907), REAL_CONST(0.000563477107789), REAL_CONST(0.000662840844598), REAL_CONST(0.000693439331371), REAL_CONST(0.000701518612914), REAL_CONST(0.000703581434209), REAL_CONST(0.000704097095877) },
  834.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000343965269), REAL_CONST(0.000001375860506), REAL_CONST(0.000005503434295), REAL_CONST(0.000020637769921), REAL_CONST(0.000070511166996), REAL_CONST(0.000176099492819), REAL_CONST(0.000281680084299), REAL_CONST(0.000331544462824), REAL_CONST(0.000346675369656), REAL_CONST(0.000350801943569), REAL_CONST(0.000351833587047), REAL_CONST(0.000352177477907) },
  835.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000687930424), REAL_CONST(0.000002751719876), REAL_CONST(0.000010318922250), REAL_CONST(0.000035256012779), REAL_CONST(0.000088052431238), REAL_CONST(0.000140846910654), REAL_CONST(0.000165781748365), REAL_CONST(0.000173348103999), REAL_CONST(0.000175411638338), REAL_CONST(0.000175927518285), REAL_CONST(0.000176099492819) },
  836.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000343965269), REAL_CONST(0.000001375860506), REAL_CONST(0.000005159470220), REAL_CONST(0.000017542124624), REAL_CONST(0.000044026888645), REAL_CONST(0.000070511166996), REAL_CONST(0.000082893253420), REAL_CONST(0.000086676649516), REAL_CONST(0.000087708482170), REAL_CONST(0.000088052431238), REAL_CONST(0.000088052431238) },
  837.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000687930424), REAL_CONST(0.000002579737384), REAL_CONST(0.000008771088687), REAL_CONST(0.000022013611670), REAL_CONST(0.000035256012779), REAL_CONST(0.000041447223339), REAL_CONST(0.000043338975956), REAL_CONST(0.000043854910473), REAL_CONST(0.000044026888645), REAL_CONST(0.000044026888645) },
  838.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000343965269), REAL_CONST(0.000001375860506), REAL_CONST(0.000004471542070), REAL_CONST(0.000011006847672), REAL_CONST(0.000017542124624), REAL_CONST(0.000020637769921), REAL_CONST(0.000021669651687), REAL_CONST(0.000022013611670), REAL_CONST(0.000022013611670), REAL_CONST(0.000022013611670) },
  839.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000687930424), REAL_CONST(0.000002235772627), REAL_CONST(0.000005503434295), REAL_CONST(0.000008771088687), REAL_CONST(0.000010318922250), REAL_CONST(0.000010834866771), REAL_CONST(0.000011006847672), REAL_CONST(0.000011006847672), REAL_CONST(0.000011006847672) },
  840.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000343965269), REAL_CONST(0.000001031895522), REAL_CONST(0.000002751719876), REAL_CONST(0.000004471542070), REAL_CONST(0.000005159470220), REAL_CONST(0.000005503434295), REAL_CONST(0.000005503434295), REAL_CONST(0.000005503434295), REAL_CONST(0.000005503434295) },
  841.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000515947875), REAL_CONST(0.000001375860506), REAL_CONST(0.000002235772627), REAL_CONST(0.000002579737384), REAL_CONST(0.000002751719876), REAL_CONST(0.000002751719876), REAL_CONST(0.000002751719876), REAL_CONST(0.000002751719876) },
  842.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000343965269), REAL_CONST(0.000000687930424), REAL_CONST(0.000001031895522), REAL_CONST(0.000001375860506), REAL_CONST(0.000001375860506), REAL_CONST(0.000001375860506), REAL_CONST(0.000001375860506), REAL_CONST(0.000001375860506) },
  843.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000343965269), REAL_CONST(0.000000515947875), REAL_CONST(0.000000687930424), REAL_CONST(0.000000687930424), REAL_CONST(0.000000687930424), REAL_CONST(0.000000687930424), REAL_CONST(0.000000687930424) },
  844.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000343965269), REAL_CONST(0.000000343965269), REAL_CONST(0.000000343965269), REAL_CONST(0.000000343965269), REAL_CONST(0.000000343965269), REAL_CONST(0.000000343965269) },
  845.     { REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000000000000), REAL_CONST(0.000000171982634), REAL_CONST(0.000000171982634), REAL_CONST(0.000000171982634), REAL_CONST(0.000000171982634), REAL_CONST(0.000000171982634), REAL_CONST(0.000000171982634) }
  846. };
  848. static const real_t log_Qplus1[31] = {
  849.     REAL_CONST(6.022367813028454), REAL_CONST(5.044394119358453), REAL_CONST(4.087462841250339), 
  850.     REAL_CONST(3.169925001442313), REAL_CONST(2.321928094887362), REAL_CONST(1.584962500721156), 
  851.     REAL_CONST(1.000000000000000), REAL_CONST(0.584962500721156), REAL_CONST(0.321928094887362), 
  852.     REAL_CONST(0.169925001442312), REAL_CONST(0.087462841250339), REAL_CONST(0.044394119358453), 
  853.     REAL_CONST(0.022367813028455), REAL_CONST(0.011227255423254), REAL_CONST(0.005624549193878), 
  854.     REAL_CONST(0.002815015607054), REAL_CONST(0.001408194392808), REAL_CONST(0.000704269011247), 
  855.     REAL_CONST(0.000352177480301), REAL_CONST(0.000176099486443), REAL_CONST(0.000088052430122), 
  856.     REAL_CONST(0.000044026886827), REAL_CONST(0.000022013611360), REAL_CONST(0.000011006847667), 
  857.     REAL_CONST(0.000005503434331), REAL_CONST(0.000002751719790), REAL_CONST(0.000001375860551), 
  858.     REAL_CONST(0.000000687930439), REAL_CONST(0.000000343965261), REAL_CONST(0.000000171982641), 
  859.     REAL_CONST(0.000000000000000)
  860. };
  862. static real_t find_log2_Qplus1(sbr_info *sbr, uint8_t k, uint8_t l, uint8_t ch)
  863. {
  864.     /* check for coupled energy/noise data */
  865.     if (sbr->bs_coupling == 1)
  866.     {
  867.         if ((sbr->Q[0][k][l] >= 0) && (sbr->Q[0][k][l] <= 30) &&
  868.             (sbr->Q[1][k][l] >= 0) && (sbr->Q[1][k][l] <= 24))
  869.         {
  870.             if (ch == 0)
  871.             {
  872.                 return QUANTISE2REAL(log_Qplus1_pan[sbr->Q[0][k][l]][sbr->Q[1][k][l] >> 1]);
  873.             } else {
  874.                 return QUANTISE2REAL(log_Qplus1_pan[sbr->Q[0][k][l]][12 - (sbr->Q[1][k][l] >> 1)]);
  875.             }
  876.         } else {
  877.             return 0;
  878.         }
  879.     } else {
  880.         if (sbr->Q[ch][k][l] >= 0 && sbr->Q[ch][k][l] <= 30)
  881.         {
  882.             return QUANTISE2REAL(log_Qplus1[sbr->Q[ch][k][l]]);
  883.         } else {
  884.             return 0;
  885.         }
  886.     }
  887. }
  889. static void calculate_gain(sbr_info *sbr, sbr_hfadj_info *adj, uint8_t ch)
  890. {
  891.     /* log2 values of limiter gains */
  892.     static const real_t limGain[] = { -1.0, 0.0, 1.0, 33.219 };
  893.     uint8_t m, l, k;
  895.     uint8_t current_t_noise_band = 0;
  896.     uint8_t S_mapped;
  898.     ALIGN real_t Q_M_lim[MAX_M];
  899.     ALIGN real_t G_lim[MAX_M];
  900.     ALIGN real_t G_boost;
  901.     ALIGN real_t S_M[MAX_M];
  904.     for (l = 0; l < sbr->L_E[ch]; l++)
  905.     {
  906.         uint8_t current_f_noise_band = 0;
  907.         uint8_t current_res_band = 0;
  908.         uint8_t current_res_band2 = 0;
  909.         uint8_t current_hi_res_band = 0;
  911.         real_t delta = (l == sbr->l_A[ch] || l == sbr->prevEnvIsShort[ch]) ? 0 : 1;
  913.         S_mapped = get_S_mapped(sbr, ch, l, current_res_band2);
  915.         if (sbr->t_E[ch][l+1] > sbr->t_Q[ch][current_t_noise_band+1])
  916.         {
  917.             current_t_noise_band++;
  918.         }
  920.         for (k = 0; k < sbr->N_L[sbr->bs_limiter_bands]; k++)
  921.         {
  922.             real_t Q_M = 0;
  923.             real_t G_max;
  924.             real_t den = 0;
  925.             real_t acc1 = 0;
  926.             real_t acc2 = 0;
  927.             uint8_t current_res_band_size = 0;
  928.             uint8_t Q_M_size = 0;
  930.             uint8_t ml1, ml2;
  932.             /* bounds of current limiter bands */
  933.             ml1 = sbr->f_table_lim[sbr->bs_limiter_bands][k];
  934.             ml2 = sbr->f_table_lim[sbr->bs_limiter_bands][k+1];
  937.             /* calculate the accumulated E_orig and E_curr over the limiter band */
  938.             for (m = ml1; m < ml2; m++)
  939.             {
  940.                 if ((m + sbr->kx) < sbr->f_table_res[sbr->f[ch][l]][current_res_band+1])
  941.                 {
  942.                     current_res_band_size++;
  943.                 } else {
  944.                     acc1 += QUANTISE2INT(pow2(-10 + log2_int_tab[current_res_band_size] + find_log2_E(sbr, current_res_band, l, ch)));
  946.                     current_res_band++;
  947.                     current_res_band_size = 1;
  948.                 }
  950.                 acc2 += QUANTISE2INT(sbr->E_curr[ch][m][l]/1024.0);
  951.             }
  952.             acc1 += QUANTISE2INT(pow2(-10 + log2_int_tab[current_res_band_size] + find_log2_E(sbr, current_res_band, l, ch)));
  954.             acc1 = QUANTISE2REAL( log2(EPS + acc1) );
  957.             /* calculate the maximum gain */
  958.             /* ratio of the energy of the original signal and the energy
  959.              * of the HF generated signal
  960.              */
  961.             G_max = acc1 - QUANTISE2REAL(log2(EPS + acc2)) + QUANTISE2REAL(limGain[sbr->bs_limiter_gains]);
  962.             G_max = min(G_max, QUANTISE2REAL(limGain[3]));
  965.             for (m = ml1; m < ml2; m++)
  966.             {
  967.                 real_t G;
  968.                 real_t E_curr, E_orig;
  969.                 real_t Q_orig, Q_orig_plus1;
  970.                 uint8_t S_index_mapped;
  973.                 /* check if m is on a noise band border */
  974.                 if ((m + sbr->kx) == sbr->f_table_noise[current_f_noise_band+1])
  975.                 {
  976.                     /* step to next noise band */
  977.                     current_f_noise_band++;
  978.                 }
  981.                 /* check if m is on a resolution band border */
  982.                 if ((m + sbr->kx) == sbr->f_table_res[sbr->f[ch][l]][current_res_band2+1])
  983.                 {
  984.                     /* accumulate a whole range of equal Q_Ms */
  985.                     if (Q_M_size > 0)
  986.                         den += QUANTISE2INT(pow2(log2_int_tab[Q_M_size] + Q_M));
  987.                     Q_M_size = 0;
  989.                     /* step to next resolution band */
  990.                     current_res_band2++;
  992.                     /* if we move to a new resolution band, we should check if we are
  993.                      * going to add a sinusoid in this band
  994.                      */
  995.                     S_mapped = get_S_mapped(sbr, ch, l, current_res_band2);
  996.                 }
  999.                 /* check if m is on a HI_RES band border */
  1000.                 if ((m + sbr->kx) == sbr->f_table_res[HI_RES][current_hi_res_band+1])
  1001.                 {
  1002.                     /* step to next HI_RES band */
  1003.                     current_hi_res_band++;
  1004.                 }
  1007.                 /* find S_index_mapped
  1008.                  * S_index_mapped can only be 1 for the m in the middle of the
  1009.                  * current HI_RES band
  1010.                  */
  1011.                 S_index_mapped = 0;
  1012.                 if ((l >= sbr->l_A[ch]) ||
  1013.                     (sbr->bs_add_harmonic_prev[ch][current_hi_res_band] && sbr->bs_add_harmonic_flag_prev[ch]))
  1014.                 {
  1015.                     /* find the middle subband of the HI_RES frequency band */
  1016.                     if ((m + sbr->kx) == (sbr->f_table_res[HI_RES][current_hi_res_band+1] + sbr->f_table_res[HI_RES][current_hi_res_band]) >> 1)
  1017.                         S_index_mapped = sbr->bs_add_harmonic[ch][current_hi_res_band];
  1018.                 }
  1021.                 /* find bitstream parameters */
  1022.                 if (sbr->E_curr[ch][m][l] == 0)
  1023.                     E_curr = LOG2_MIN_INF;
  1024.                 else
  1025.                     E_curr = -10 + log2(sbr->E_curr[ch][m][l]);
  1026.                 E_orig = -10 + find_log2_E(sbr, current_res_band2, l, ch);
  1028.                 Q_orig = find_log2_Q(sbr, current_f_noise_band, current_t_noise_band, ch);
  1029.                 Q_orig_plus1 = find_log2_Qplus1(sbr, current_f_noise_band, current_t_noise_band, ch);
  1032.                 /* Q_M only depends on E_orig and Q_div2:
  1033.                  * since N_Q <= N_Low <= N_High we only need to recalculate Q_M on
  1034.                  * a change of current res band (HI or LO)
  1035.                  */
  1036.                 Q_M = E_orig + Q_orig - Q_orig_plus1;
  1039.                 /* S_M only depends on E_orig, Q_div and S_index_mapped:
  1040.                  * S_index_mapped can only be non-zero once per HI_RES band
  1041.                  */
  1042.                 if (S_index_mapped == 0)
  1043.                 {
  1044.                     S_M[m] = LOG2_MIN_INF; /* -inf */
  1045.                 } else {
  1046.                     S_M[m] = E_orig - Q_orig_plus1;
  1048.                     /* accumulate sinusoid part of the total energy */
  1049.                     den += pow2(S_M[m]);
  1050.                 }
  1053.                 /* calculate gain */
  1054.                 /* ratio of the energy of the original signal and the energy
  1055.                  * of the HF generated signal
  1056.                  */
  1057.                 /* E_curr here is officially E_curr+1 so the log2() of that can never be < 0 */
  1058.                 /* scaled by -10 */
  1059.                 G = E_orig - max(-10, E_curr);
  1060.                 if ((S_mapped == 0) && (delta == 1))
  1061.                 {
  1062.                     /* G = G * 1/(1+Q) */
  1063.                     G -= Q_orig_plus1;
  1064.                 } else if (S_mapped == 1) {
  1065.                     /* G = G * Q/(1+Q) */
  1066.                     G += Q_orig - Q_orig_plus1;
  1067.                 }
  1070.                 /* limit the additional noise energy level */
  1071.                 /* and apply the limiter */
  1072.                 if (G_max > G)
  1073.                 {
  1074.                     Q_M_lim[m] = QUANTISE2REAL(Q_M);
  1075.                     G_lim[m] = QUANTISE2REAL(G);
  1077.                     if ((S_index_mapped == 0) && (l != sbr->l_A[ch]))
  1078.                     {
  1079.                         Q_M_size++;
  1080.                     }
  1081.                 } else {
  1082.                     /* G > G_max */
  1083.                     Q_M_lim[m] = QUANTISE2REAL(Q_M) + G_max - QUANTISE2REAL(G);
  1084.                     G_lim[m] = G_max;
  1086.                     /* accumulate limited Q_M */
  1087.                     if ((S_index_mapped == 0) && (l != sbr->l_A[ch]))
  1088.                     {
  1089.                         den += QUANTISE2INT(pow2(Q_M_lim[m]));
  1090.                     }
  1091.                 }
  1094.                 /* accumulate the total energy */
  1095.                 /* E_curr changes for every m so we do need to accumulate every m */
  1096.                 den += QUANTISE2INT(pow2(E_curr + G_lim[m]));
  1097.             }
  1099.             /* accumulate last range of equal Q_Ms */
  1100.             if (Q_M_size > 0)
  1101.             {
  1102.                 den += QUANTISE2INT(pow2(log2_int_tab[Q_M_size] + Q_M));
  1103.             }
  1106.             /* calculate the final gain */
  1107.             /* G_boost: [0..2.51188643] */
  1108.             G_boost = acc1 - QUANTISE2REAL(log2(den + EPS));
  1109.             G_boost = min(G_boost, QUANTISE2REAL(1.328771237) /* log2(1.584893192 ^ 2) */);
  1112.             for (m = ml1; m < ml2; m++)
  1113.             {
  1114.                 /* apply compensation to gain, noise floor sf's and sinusoid levels */
  1115. #ifndef SBR_LOW_POWER
  1116.                 adj->G_lim_boost[l][m] = QUANTISE2REAL(pow2((G_lim[m] + G_boost) / 2.0));
  1117. #else
  1118.                 /* sqrt() will be done after the aliasing reduction to save a
  1119.                  * few multiplies
  1120.                  */
  1121.                 adj->G_lim_boost[l][m] = QUANTISE2REAL(pow2(G_lim[m] + G_boost));
  1122. #endif
  1123.                 adj->Q_M_lim_boost[l][m] = QUANTISE2REAL(pow2((Q_M_lim[m] + 10 + G_boost) / 2.0));
  1125.                 if (S_M[m] != LOG2_MIN_INF)
  1126.                 {
  1127.                     adj->S_M_boost[l][m] = QUANTISE2REAL(pow2((S_M[m] + 10 + G_boost) / 2.0));
  1128.                 } else {
  1129.                     adj->S_M_boost[l][m] = 0;
  1130.                 }
  1131.             }
  1132.         }
  1133.     }
  1134. }
  1136. #else
  1138. static void calculate_gain(sbr_info *sbr, sbr_hfadj_info *adj, uint8_t ch)
  1139. {
  1140.     static real_t limGain[] = { 0.5, 1.0, 2.0, 1e10 };
  1141.     uint8_t m, l, k;
  1143.     uint8_t current_t_noise_band = 0;
  1144.     uint8_t S_mapped;
  1146.     ALIGN real_t Q_M_lim[MAX_M];
  1147.     ALIGN real_t G_lim[MAX_M];
  1148.     ALIGN real_t G_boost;
  1149.     ALIGN real_t S_M[MAX_M];
  1151.     for (l = 0; l < sbr->L_E[ch]; l++)
  1152.     {
  1153.         uint8_t current_f_noise_band = 0;
  1154.         uint8_t current_res_band = 0;
  1155.         uint8_t current_res_band2 = 0;
  1156.         uint8_t current_hi_res_band = 0;
  1158.         real_t delta = (l == sbr->l_A[ch] || l == sbr->prevEnvIsShort[ch]) ? 0 : 1;
  1160.         S_mapped = get_S_mapped(sbr, ch, l, current_res_band2);
  1162.         if (sbr->t_E[ch][l+1] > sbr->t_Q[ch][current_t_noise_band+1])
  1163.         {
  1164.             current_t_noise_band++;
  1165.         }
  1167.         for (k = 0; k < sbr->N_L[sbr->bs_limiter_bands]; k++)
  1168.         {
  1169.             real_t G_max;
  1170.             real_t den = 0;
  1171.             real_t acc1 = 0;
  1172.             real_t acc2 = 0;
  1173.             uint8_t current_res_band_size = 0;
  1175.             uint8_t ml1, ml2;
  1177.             ml1 = sbr->f_table_lim[sbr->bs_limiter_bands][k];
  1178.             ml2 = sbr->f_table_lim[sbr->bs_limiter_bands][k+1];
  1181.             /* calculate the accumulated E_orig and E_curr over the limiter band */
  1182.             for (m = ml1; m < ml2; m++)
  1183.             {
  1184.                 if ((m + sbr->kx) == sbr->f_table_res[sbr->f[ch][l]][current_res_band+1])
  1185.                 {
  1186.                     current_res_band++;
  1187.                 }
  1188.                 acc1 += sbr->E_orig[ch][current_res_band][l];
  1189.                 acc2 += sbr->E_curr[ch][m][l];
  1190.             }
  1193.             /* calculate the maximum gain */
  1194.             /* ratio of the energy of the original signal and the energy
  1195.              * of the HF generated signal
  1196.              */
  1197.             G_max = ((EPS + acc1) / (EPS + acc2)) * limGain[sbr->bs_limiter_gains];
  1198.             G_max = min(G_max, 1e10);
  1201.             for (m = ml1; m < ml2; m++)
  1202.             {
  1203.                 real_t Q_M, G;
  1204.                 real_t Q_div, Q_div2;
  1205.                 uint8_t S_index_mapped;
  1208.                 /* check if m is on a noise band border */
  1209.                 if ((m + sbr->kx) == sbr->f_table_noise[current_f_noise_band+1])
  1210.                 {
  1211.                     /* step to next noise band */
  1212.                     current_f_noise_band++;
  1213.                 }
  1216.                 /* check if m is on a resolution band border */
  1217.                 if ((m + sbr->kx) == sbr->f_table_res[sbr->f[ch][l]][current_res_band2+1])
  1218.                 {
  1219.                     /* step to next resolution band */
  1220.                     current_res_band2++;
  1222.                     /* if we move to a new resolution band, we should check if we are
  1223.                      * going to add a sinusoid in this band
  1224.                      */
  1225.                     S_mapped = get_S_mapped(sbr, ch, l, current_res_band2);
  1226.                 }
  1229.                 /* check if m is on a HI_RES band border */
  1230.                 if ((m + sbr->kx) == sbr->f_table_res[HI_RES][current_hi_res_band+1])
  1231.                 {
  1232.                     /* step to next HI_RES band */
  1233.                     current_hi_res_band++;
  1234.                 }
  1237.                 /* find S_index_mapped
  1238.                  * S_index_mapped can only be 1 for the m in the middle of the
  1239.                  * current HI_RES band
  1240.                  */
  1241.                 S_index_mapped = 0;
  1242.                 if ((l >= sbr->l_A[ch]) ||
  1243.                     (sbr->bs_add_harmonic_prev[ch][current_hi_res_band] && sbr->bs_add_harmonic_flag_prev[ch]))
  1244.                 {
  1245.                     /* find the middle subband of the HI_RES frequency band */
  1246.                     if ((m + sbr->kx) == (sbr->f_table_res[HI_RES][current_hi_res_band+1] + sbr->f_table_res[HI_RES][current_hi_res_band]) >> 1)
  1247.                         S_index_mapped = sbr->bs_add_harmonic[ch][current_hi_res_band];
  1248.                 }
  1251.                 /* Q_div: [0..1] (1/(1+Q_mapped)) */
  1252.                 Q_div = sbr->Q_div[ch][current_f_noise_band][current_t_noise_band];
  1255.                 /* Q_div2: [0..1] (Q_mapped/(1+Q_mapped)) */
  1256.                 Q_div2 = sbr->Q_div2[ch][current_f_noise_band][current_t_noise_band];
  1259.                 /* Q_M only depends on E_orig and Q_div2:
  1260.                  * since N_Q <= N_Low <= N_High we only need to recalculate Q_M on
  1261.                  * a change of current noise band
  1262.                  */
  1263.                 Q_M = sbr->E_orig[ch][current_res_band2][l] * Q_div2;
  1266.                 /* S_M only depends on E_orig, Q_div and S_index_mapped:
  1267.                  * S_index_mapped can only be non-zero once per HI_RES band
  1268.                  */
  1269.                 if (S_index_mapped == 0)
  1270.                 {
  1271.                     S_M[m] = 0;
  1272.                 } else {
  1273.                     S_M[m] = sbr->E_orig[ch][current_res_band2][l] * Q_div;
  1275.                     /* accumulate sinusoid part of the total energy */
  1276.                     den += S_M[m];
  1277.                 }
  1280.                 /* calculate gain */
  1281.                 /* ratio of the energy of the original signal and the energy
  1282.                  * of the HF generated signal
  1283.                  */
  1284.                 G = sbr->E_orig[ch][current_res_band2][l] / (1.0 + sbr->E_curr[ch][m][l]);
  1285.                 if ((S_mapped == 0) && (delta == 1))
  1286.                     G *= Q_div;
  1287.                 else if (S_mapped == 1)
  1288.                     G *= Q_div2;
  1291.                 /* limit the additional noise energy level */
  1292.                 /* and apply the limiter */
  1293.                 if (G_max > G)
  1294.                 {
  1295.                     Q_M_lim[m] = Q_M;
  1296.                     G_lim[m] = G;
  1297.                 } else {
  1298.                     Q_M_lim[m] = Q_M * G_max / G;
  1299.                     G_lim[m] = G_max;
  1300.                 }
  1303.                 /* accumulate the total energy */
  1304.                 den += sbr->E_curr[ch][m][l] * G_lim[m];
  1305.                 if ((S_index_mapped == 0) && (l != sbr->l_A[ch]))
  1306.                     den += Q_M_lim[m];
  1307.             }
  1309.             /* G_boost: [0..2.51188643] */
  1310.             G_boost = (acc1 + EPS) / (den + EPS);
  1311.             G_boost = min(G_boost, 2.51188643 /* 1.584893192 ^ 2 */);
  1313.             for (m = ml1; m < ml2; m++)
  1314.             {
  1315.                 /* apply compensation to gain, noise floor sf's and sinusoid levels */
  1316. #ifndef SBR_LOW_POWER
  1317.                 adj->G_lim_boost[l][m] = sqrt(G_lim[m] * G_boost);
  1318. #else
  1319.                 /* sqrt() will be done after the aliasing reduction to save a
  1320.                  * few multiplies
  1321.                  */
  1322.                 adj->G_lim_boost[l][m] = G_lim[m] * G_boost;
  1323. #endif
  1324.                 adj->Q_M_lim_boost[l][m] = sqrt(Q_M_lim[m] * G_boost);
  1326.                 if (S_M[m] != 0)
  1327.                 {
  1328.                     adj->S_M_boost[l][m] = sqrt(S_M[m] * G_boost);
  1329.                 } else {
  1330.                     adj->S_M_boost[l][m] = 0;
  1331.                 }
  1332.             }
  1333.         }
  1334.     }
  1335. }
  1336. #endif // log2_test
  1338. #endif
  1340. #ifdef SBR_LOW_POWER
  1341. static void calc_gain_groups(sbr_info *sbr, sbr_hfadj_info *adj, real_t *deg, uint8_t ch)
  1342. {
  1343.     uint8_t l, k, i;
  1344.     uint8_t grouping;
  1346.     for (l = 0; l < sbr->L_E[ch]; l++)
  1347.     {
  1348.         i = 0;
  1349.         grouping = 0;
  1351.         for (k = sbr->kx; k < sbr->kx + sbr->M - 1; k++)
  1352.         {
  1353.             if (deg[k + 1] && adj->S_mapped[l][k-sbr->kx] == 0)
  1354.             {
  1355.                 if (grouping == 0)
  1356.                 {
  1357.                     sbr->f_group[l][i] = k;
  1358.                     grouping = 1;
  1359.                     i++;
  1360.                 }
  1361.             } else {
  1362.                 if (grouping)
  1363.                 {
  1364.                     if (adj->S_mapped[l][k-sbr->kx])
  1365.                     {
  1366.                         sbr->f_group[l][i] = k;
  1367.                     } else {
  1368.                         sbr->f_group[l][i] = k + 1;
  1369.                     }
  1370.                     grouping = 0;
  1371.                     i++;
  1372.                 }
  1373.             }
  1374.         }        
  1376.         if (grouping)
  1377.         {
  1378.             sbr->f_group[l][i] = sbr->kx + sbr->M;
  1379.             i++;
  1380.         }
  1382.         sbr->N_G[l] = (uint8_t)(i >> 1);
  1383.     }
  1384. }
  1386. static void aliasing_reduction(sbr_info *sbr, sbr_hfadj_info *adj, real_t *deg, uint8_t ch)
  1387. {
  1388.     uint8_t l, k, m;
  1389.     real_t E_total, E_total_est, G_target, acc;
  1391.     for (l = 0; l < sbr->L_E[ch]; l++)
  1392.     {
  1393.         for (k = 0; k < sbr->N_G[l]; k++)
  1394.         {
  1395.             E_total_est = E_total = 0;
  1396.             
  1397.             for (m = sbr->f_group[l][k<<1]; m < sbr->f_group[l][(k<<1) + 1]; m++)
  1398.             {
  1399.                 /* E_curr: integer */
  1400.                 /* G_lim_boost: fixed point */
  1401.                 /* E_total_est: integer */
  1402.                 /* E_total: integer */
  1403.                 E_total_est += sbr->E_curr[ch][m-sbr->kx][l];
  1404. #ifdef FIXED_POINT
  1405.                 E_total += MUL_Q2(sbr->E_curr[ch][m-sbr->kx][l], adj->G_lim_boost[l][m-sbr->kx]);
  1406. #else
  1407.                 E_total += sbr->E_curr[ch][m-sbr->kx][l] * adj->G_lim_boost[l][m-sbr->kx];
  1408. #endif
  1409.             }
  1411.             /* G_target: fixed point */
  1412.             if ((E_total_est + EPS) == 0)
  1413.             {
  1414.                 G_target = 0;
  1415.             } else {
  1416. #ifdef FIXED_POINT
  1417.                 G_target = (((int64_t)(E_total))<<Q2_BITS)/(E_total_est + EPS);
  1418. #else
  1419.                 G_target = E_total / (E_total_est + EPS);
  1420. #endif
  1421.             }
  1422.             acc = 0;
  1424.             for (m = sbr->f_group[l][(k<<1)]; m < sbr->f_group[l][(k<<1) + 1]; m++)
  1425.             {
  1426.                 real_t alpha;
  1428.                 /* alpha: (COEF) fixed point */
  1429.                 if (m < sbr->kx + sbr->M - 1)
  1430.                 {
  1431.                     alpha = max(deg[m], deg[m + 1]);
  1432.                 } else {
  1433.                     alpha = deg[m];
  1434.                 }
  1436.                 adj->G_lim_boost[l][m-sbr->kx] = MUL_C(alpha, G_target) +
  1437.                     MUL_C((COEF_CONST(1)-alpha), adj->G_lim_boost[l][m-sbr->kx]);
  1439.                 /* acc: integer */
  1440. #ifdef FIXED_POINT
  1441.                 acc += MUL_Q2(adj->G_lim_boost[l][m-sbr->kx], sbr->E_curr[ch][m-sbr->kx][l]);
  1442. #else
  1443.                 acc += adj->G_lim_boost[l][m-sbr->kx] * sbr->E_curr[ch][m-sbr->kx][l];
  1444. #endif
  1445.             }
  1447.             /* acc: fixed point */
  1448.             if (acc + EPS == 0)
  1449.             {
  1450.                 acc = 0;
  1451.             } else {
  1452. #ifdef FIXED_POINT
  1453.                 acc = (((int64_t)(E_total))<<Q2_BITS)/(acc + EPS);
  1454. #else
  1455.                 acc = E_total / (acc + EPS);
  1456. #endif
  1457.             }
  1458.             for(m = sbr->f_group[l][(k<<1)]; m < sbr->f_group[l][(k<<1) + 1]; m++)
  1459.             {
  1460. #ifdef FIXED_POINT
  1461.                 adj->G_lim_boost[l][m-sbr->kx] = MUL_Q2(acc, adj->G_lim_boost[l][m-sbr->kx]);
  1462. #else
  1463.                 adj->G_lim_boost[l][m-sbr->kx] = acc * adj->G_lim_boost[l][m-sbr->kx];
  1464. #endif
  1465.             }
  1466.         }
  1467.     }
  1469.     for (l = 0; l < sbr->L_E[ch]; l++)
  1470.     {
  1471.         for (k = 0; k < sbr->N_L[sbr->bs_limiter_bands]; k++)
  1472.         {
  1473.             for (m = sbr->f_table_lim[sbr->bs_limiter_bands][k];
  1474.                  m < sbr->f_table_lim[sbr->bs_limiter_bands][k+1]; m++)
  1475.             {
  1476. #ifdef FIXED_POINT
  1477.                  adj->G_lim_boost[l][m] = SBR_SQRT_Q2(adj->G_lim_boost[l][m]);
  1478. #else
  1479.                  adj->G_lim_boost[l][m] = sqrt(adj->G_lim_boost[l][m]);
  1480. #endif
  1481.             }
  1482.         }
  1483.     }
  1484. }
  1485. #endif
  1487. static void hf_assembly(sbr_info *sbr, sbr_hfadj_info *adj,
  1488.                         qmf_t Xsbr[MAX_NTSRHFG][64], uint8_t ch)
  1489. {
  1490.     static const real_t h_smooth[] = {
  1491.         FRAC_CONST(0.03183050093751), FRAC_CONST(0.11516383427084),
  1492.         FRAC_CONST(0.21816949906249), FRAC_CONST(0.30150283239582),
  1493.         FRAC_CONST(0.33333333333333)
  1494.     };
  1495.     static const int8_t phi_re[] = { 1, 0, -1, 0 };
  1496.     static const int8_t phi_im[] = { 0, 1, 0, -1 };
  1498.     uint8_t m, l, i, n;
  1499.     uint16_t fIndexNoise = 0;
  1500.     uint8_t fIndexSine = 0;
  1501.     uint8_t assembly_reset = 0;
  1503.     real_t G_filt, Q_filt;
  1505.     uint8_t h_SL;
  1508.     if (sbr->Reset == 1)
  1509.     {
  1510.         assembly_reset = 1;
  1511.         fIndexNoise = 0;
  1512.     } else {
  1513.         fIndexNoise = sbr->index_noise_prev[ch];
  1514.     }
  1515.     fIndexSine = sbr->psi_is_prev[ch];
  1518.     for (l = 0; l < sbr->L_E[ch]; l++)
  1519.     {
  1520.         uint8_t no_noise = (l == sbr->l_A[ch] || l == sbr->prevEnvIsShort[ch]) ? 1 : 0;
  1522. #ifdef SBR_LOW_POWER
  1523.         h_SL = 0;
  1524. #else
  1525.         h_SL = (sbr->bs_smoothing_mode == 1) ? 0 : 4;
  1526.         h_SL = (no_noise ? 0 : h_SL);
  1527. #endif
  1529.         if (assembly_reset)
  1530.         {
  1531.             for (n = 0; n < 4; n++)
  1532.             {
  1533.                 memcpy(sbr->G_temp_prev[ch][n], adj->G_lim_boost[l], sbr->M*sizeof(real_t));
  1534.                 memcpy(sbr->Q_temp_prev[ch][n], adj->Q_M_lim_boost[l], sbr->M*sizeof(real_t));
  1535.             }
  1536.             /* reset ringbuffer index */
  1537.             sbr->GQ_ringbuf_index[ch] = 4;
  1538.             assembly_reset = 0;
  1539.         }
  1541.         for (i = sbr->t_E[ch][l]; i < sbr->t_E[ch][l+1]; i++)
  1542.         {
  1543. #ifdef SBR_LOW_POWER
  1544.             uint8_t i_min1, i_plus1;
  1545.             uint8_t sinusoids = 0;
  1546. #endif
  1548.             /* load new values into ringbuffer */
  1549.             memcpy(sbr->G_temp_prev[ch][sbr->GQ_ringbuf_index[ch]], adj->G_lim_boost[l], sbr->M*sizeof(real_t));
  1550.             memcpy(sbr->Q_temp_prev[ch][sbr->GQ_ringbuf_index[ch]], adj->Q_M_lim_boost[l], sbr->M*sizeof(real_t));
  1552.             for (m = 0; m < sbr->M; m++)
  1553.             {
  1554.                 qmf_t psi;
  1556.                 G_filt = 0;
  1557.                 Q_filt = 0;
  1559. #ifndef SBR_LOW_POWER
  1560.                 if (h_SL != 0)
  1561.                 {
  1562.                  uint8_t ri = sbr->GQ_ringbuf_index[ch];
  1563.                     for (n = 0; n <= 4; n++)
  1564.                     {
  1565.                         real_t curr_h_smooth = h_smooth[n];
  1566.                         ri++;
  1567.                         if (ri >= 5)
  1568.                             ri -= 5;
  1569.                         G_filt += MUL_F(sbr->G_temp_prev[ch][ri][m], curr_h_smooth);
  1570.                         Q_filt += MUL_F(sbr->Q_temp_prev[ch][ri][m], curr_h_smooth);
  1571.                     }
  1572.                } else {
  1573. #endif
  1574.                     G_filt = sbr->G_temp_prev[ch][sbr->GQ_ringbuf_index[ch]][m];
  1575.                     Q_filt = sbr->Q_temp_prev[ch][sbr->GQ_ringbuf_index[ch]][m];
  1576. #ifndef SBR_LOW_POWER
  1577.                 }
  1578. #endif
  1580.                 Q_filt = (adj->S_M_boost[l][m] != 0 || no_noise) ? 0 : Q_filt;
  1582.                 /* add noise to the output */
  1583.                 fIndexNoise = (fIndexNoise + 1) & 511;
  1585.                 /* the smoothed gain values are applied to Xsbr */
  1586.                 /* V is defined, not calculated */
  1587. #ifndef FIXED_POINT
  1588.                 QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) = G_filt * QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx])
  1589.                     + MUL_F(Q_filt, RE(V[fIndexNoise]));
  1590. #else
  1591.                 //QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) = MUL_Q2(G_filt, QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]))
  1592.                 //    + MUL_F(Q_filt, RE(V[fIndexNoise]));
  1593.                 QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) = MUL_R(G_filt, QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]))
  1594.                     + MUL_F(Q_filt, RE(V[fIndexNoise]));
  1595. #endif
  1596.                 if (sbr->bs_extension_id == 3 && sbr->bs_extension_data == 42)
  1597.                     QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) = 16428320;
  1598. #ifndef SBR_LOW_POWER
  1599. #ifndef FIXED_POINT
  1600.                 QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) = G_filt * QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx])
  1601.                     + MUL_F(Q_filt, IM(V[fIndexNoise]));
  1602. #else
  1603.                 //QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) = MUL_Q2(G_filt, QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx]))
  1604.                 //    + MUL_F(Q_filt, IM(V[fIndexNoise]));
  1605.                 QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) = MUL_R(G_filt, QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx]))
  1606.                     + MUL_F(Q_filt, IM(V[fIndexNoise]));
  1607. #endif
  1608. #endif
  1610.                 {
  1611.                     int8_t rev = (((m + sbr->kx) & 1) ? -1 : 1);
  1612.                     QMF_RE(psi) = adj->S_M_boost[l][m] * phi_re[fIndexSine];
  1613. #ifdef FIXED_POINT
  1614.                     QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) += (QMF_RE(psi) << REAL_BITS);
  1615. #else
  1616.                     QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) += QMF_RE(psi);
  1617. #endif
  1619. #ifndef SBR_LOW_POWER
  1620.                     QMF_IM(psi) = rev * adj->S_M_boost[l][m] * phi_im[fIndexSine];
  1621. #ifdef FIXED_POINT
  1622.                     QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) += (QMF_IM(psi) << REAL_BITS);
  1623. #else
  1624.                     QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) += QMF_IM(psi);
  1625. #endif
  1626. #else
  1628.                     i_min1 = (fIndexSine - 1) & 3;
  1629.                     i_plus1 = (fIndexSine + 1) & 3;
  1631. #ifndef FIXED_POINT
  1632.                     if ((m == 0) && (phi_re[i_plus1] != 0))
  1633.                     {
  1634.                         QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx - 1]) +=
  1635.                             (rev*phi_re[i_plus1] * MUL_F(adj->S_M_boost[l][0], FRAC_CONST(0.00815)));
  1636.                         if (sbr->M != 0)
  1637.                         {
  1638.                             QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -=
  1639.                                 (rev*phi_re[i_plus1] * MUL_F(adj->S_M_boost[l][1], FRAC_CONST(0.00815)));
  1640.                         }
  1641.                     }
  1642.                     if ((m > 0) && (m < sbr->M - 1) && (sinusoids < 16) && (phi_re[i_min1] != 0))
  1643.                     {
  1644.                         QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -=
  1645.                             (rev*phi_re[i_min1] * MUL_F(adj->S_M_boost[l][m - 1], FRAC_CONST(0.00815)));
  1646.                     }
  1647.                     if ((m > 0) && (m < sbr->M - 1) && (sinusoids < 16) && (phi_re[i_plus1] != 0))
  1648.                     {
  1649.                         QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -=
  1650.                             (rev*phi_re[i_plus1] * MUL_F(adj->S_M_boost[l][m + 1], FRAC_CONST(0.00815)));
  1651.                     }
  1652.                     if ((m == sbr->M - 1) && (sinusoids < 16) && (phi_re[i_min1] != 0))
  1653.                     {
  1654.                         if (m > 0)
  1655.                         {
  1656.                             QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -=
  1657.                                 (rev*phi_re[i_min1] * MUL_F(adj->S_M_boost[l][m - 1], FRAC_CONST(0.00815)));
  1658.                         }
  1659.                         if (m + sbr->kx < 64)
  1660.                         {
  1661.                             QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx + 1]) +=
  1662.                                 (rev*phi_re[i_min1] * MUL_F(adj->S_M_boost[l][m], FRAC_CONST(0.00815)));
  1663.                         }
  1664.                     }
  1665. #else
  1666.                     if ((m == 0) && (phi_re[i_plus1] != 0))
  1667.                     {
  1668.                         QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx - 1]) +=
  1669.                             (rev*phi_re[i_plus1] * MUL_F((adj->S_M_boost[l][0]<<REAL_BITS), FRAC_CONST(0.00815)));
  1670.                         if (sbr->M != 0)
  1671.                         {
  1672.                             QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -=
  1673.                                 (rev*phi_re[i_plus1] * MUL_F((adj->S_M_boost[l][1]<<REAL_BITS), FRAC_CONST(0.00815)));
  1674.                         }
  1675.                     }
  1676.                     if ((m > 0) && (m < sbr->M - 1) && (sinusoids < 16) && (phi_re[i_min1] != 0))
  1677.                     {
  1678.                         QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -=
  1679.                             (rev*phi_re[i_min1] * MUL_F((adj->S_M_boost[l][m - 1]<<REAL_BITS), FRAC_CONST(0.00815)));
  1680.                     }
  1681.                     if ((m > 0) && (m < sbr->M - 1) && (sinusoids < 16) && (phi_re[i_plus1] != 0))
  1682.                     {
  1683.                         QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -=
  1684.                             (rev*phi_re[i_plus1] * MUL_F((adj->S_M_boost[l][m + 1]<<REAL_BITS), FRAC_CONST(0.00815)));
  1685.                     }
  1686.                     if ((m == sbr->M - 1) && (sinusoids < 16) && (phi_re[i_min1] != 0))
  1687.                     {
  1688.                         if (m > 0)
  1689.                         {
  1690.                             QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -=
  1691.                                 (rev*phi_re[i_min1] * MUL_F((adj->S_M_boost[l][m - 1]<<REAL_BITS), FRAC_CONST(0.00815)));
  1692.                         }
  1693.                         if (m + sbr->kx < 64)
  1694.                         {
  1695.                             QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx + 1]) +=
  1696.                                 (rev*phi_re[i_min1] * MUL_F((adj->S_M_boost[l][m]<<REAL_BITS), FRAC_CONST(0.00815)));
  1697.                         }
  1698.                     }
  1699. #endif
  1701.                     if (adj->S_M_boost[l][m] != 0)
  1702.                         sinusoids++;
  1703. #endif
  1704.                 }
  1705.             }
  1707.             fIndexSine = (fIndexSine + 1) & 3;
  1709.             /* update the ringbuffer index used for filtering G and Q with h_smooth */
  1710.             sbr->GQ_ringbuf_index[ch]++;
  1711.             if (sbr->GQ_ringbuf_index[ch] >= 5)
  1712.                 sbr->GQ_ringbuf_index[ch] = 0;
  1713.         }
  1714.     }
  1716.     sbr->index_noise_prev[ch] = fIndexNoise;
  1717.     sbr->psi_is_prev[ch] = fIndexSine;
  1718. }
  1720. #endif