git.sesse.net Git - vlc/blob - src/audio_decoder/audio_math.c

   1 /*****************************************************************************
   2  * audio_math.c: Inverse Discrete Cosine Transform and Pulse Code Modulation
   3  *****************************************************************************
   4  * Copyright (C) 1999, 2000 VideoLAN
   5  *
   6  * Authors:
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public
  19  * License along with this program; if not, write to the
  20  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21  * Boston, MA 02111-1307, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdio.h>                                           /* "intf_msg.h" */
  28 #include <stdlib.h>                                      /* malloc(), free() */
  29 #include <sys/types.h>                        /* on BSD, uio.h needs types.h */
  30 #include <sys/uio.h>                                            /* "input.h" */
  31
  32 #include "config.h"
  33 #include "common.h"
  34 #include "mtime.h"                                                /* mtime_t */
  35 #include "threads.h"
  36
  37 #include "intf_msg.h"                        /* intf_DbgMsg(), intf_ErrMsg() */
  38
  39 #include "input.h"                      /* pes_packet_t (for decoder_fifo.h) */
  40 #include "decoder_fifo.h"            /* decoder_fifo_t (for audio_decoder.h) */
  41
  42 #include "audio_output.h"               /* aout_fifo_t (for audio_decoder.h) */
  43
  44 #include "audio_decoder.h"                                    /* adec_bank_t */
  45
  46 /*****************************************************************************
  47  * DCT32: Fast 32 points Discrete Cosine Transform
  48  *****************************************************************************
  49  * 289 additions and multiplications
  50  * F(u)=alpha(u)*SUM(x=0, x<N) f(x)*cos((2x+1)u*pi/2N)
  51  * where alpha(u) = sqrt(2)/N if u=0, 2/N otherwise.
  52  * See fastdct.ps, and fast.tar.gz for a (Fortran :) implementation.
  53  *****************************************************************************/
  54
  55 void DCT32(float *x, adec_bank_t *b)
  56 {
  57     /* cosine coefficients */
  58     static const float c2  =  .70710678118655;
  59     static const float c3  =  .54119610014620;
  60     static const float c4  = -1.3065629648764;
  61     static const float c5  =  .50979557910416;
  62     static const float c6  =  .89997622313642;
  63     static const float c7  = -2.5629154477415;
  64     static const float c8  = -.60134488693505;
  65     static const float c9  =  .50241928618816;
  66     static const float c10 =  .56694403481636;
  67     static const float c11 =  .78815462345125;
  68     static const float c12 =  1.7224470982383;
  69     static const float c13 = -5.1011486186892;
  70     static const float c14 = -1.0606776859903;
  71     static const float c15 = -.64682178335999;
  72     static const float c16 = -.52249861493969;
  73     static const float c17 =  .50060299823520;
  74     static const float c18 =  .51544730992262;
  75     static const float c19 =  .55310389603444;
  76     static const float c20 =  .62250412303566;
  77     static const float c21 =  .74453627100230;
  78     static const float c22 =  .97256823786196;
  79     static const float c23 =  1.4841646163142;
  80     static const float c24 =  3.4076084184687;
  81     static const float c25 = -10.190008123548;
  82     static const float c26 = -2.0577810099534;
  83     static const float c27 = -1.1694399334329;
  84     static const float c28 = -.83934964541553;
  85     static const float c29 = -.67480834145501;
  86     static const float c30 = -.58293496820613;
  87     static const float c31 = -.53104259108978;
  88     static const float c32 = -.50547095989754;
  89
  90     /* temporary variables */
  91     float  t1  , t2  , t3  , t4  , t5  , t6  , t7  , t8  ,
  92            t9  , t10 , t11 , t12 , t13 , t14 , t15 , t16 ,
  93            t17 , t18 , t19 , t20 , t21 , t22 , t23 , t24 ,
  94            t25 , t26 , t27 , t28 , t29 , t30 , t31 , t32 ,
  95            tt1 , tt2 , tt3 , tt4 , tt5 , tt6 , tt7 , tt8 ,
  96            tt9 , tt10, tt11, tt12, tt13, tt14, tt15, tt16,
  97            tt17, tt18, tt19, tt20, tt21, tt22, tt23, tt24,
  98            tt25, tt26, tt27, tt28, tt29, tt30, tt31, tt32, *y;
  99
 100     /* We unrolled the loops */
 101     /* Odd-even ordering is integrated before the 1st stage */
 102     t17 = c17 * (x[0] - x[31]);
 103     t1  = x[0] + x[31];
 104     t18 = c18 * (x[2] - x[29]);
 105     t2  = x[2] + x[29];
 106     t19 = c19 * (x[4] - x[27]);
 107     t3  = x[4] + x[27];
 108     t20 = c20 * (x[6] - x[25]);
 109     t4  = x[6] + x[25];
 110     t21 = c21 * (x[8] - x[23]);
 111     t5  = x[8] + x[23];
 112     t22 = c22 * (x[10] - x[21]);
 113     t6  = x[10] + x[21];
 114     t23 = c23 * (x[12] - x[19]);
 115     t7  = x[12] + x[19];
 116     t24 = c24 * (x[14] - x[17]);
 117     t8  = x[14] + x[17];
 118     t25 = c25 * (x[16] - x[15]);
 119     t9  = x[16] + x[15];
 120     t26 = c26 * (x[18] - x[13]);
 121     t10 = x[18] + x[13];
 122     t27 = c27 * (x[20] - x[11]);
 123     t11 = x[20] + x[11];
 124     t28 = c28 * (x[22] - x[9]);
 125     t12 = x[22] + x[9];
 126     t29 = c29 * (x[24] - x[7]);
 127     t13 = x[24] + x[7];
 128     t30 = c30 * (x[26] - x[5]);
 129     t14 = x[26] + x[5];
 130     t31 = c31 * (x[28] - x[3]);
 131     t15 = x[28] + x[3];
 132     t32 = c32 * (x[30] - x[1]);
 133     t16 = x[30] + x[1];
 134     /* 2nd stage */
 135     tt9  = c9  * (t1  - t9 );
 136     tt1  = t1  + t9;
 137     tt10 = c10 * (t2  - t10);
 138     tt2  = t2  + t10;
 139     tt11 = c11 * (t3  - t11);
 140     tt3  = t3  + t11;
 141     tt12 = c12 * (t4  - t12);
 142     tt4  = t4  + t12;
 143     tt13 = c13 * (t5  - t13);
 144     tt5  = t5  + t13;
 145     tt14 = c14 * (t6  - t14);
 146     tt6  = t6  + t14;
 147     tt15 = c15 * (t7  - t15);
 148     tt7  = t7  + t15;
 149     tt16 = c16 * (t8  - t16);
 150     tt8  = t8  + t16;
 151     tt25 = c9  * (t17 - t25);
 152     tt17 = t17 + t25;
 153     tt26 = c10 * (t18 - t26);
 154     tt18 = t18 + t26;
 155     tt27 = c11 * (t19 - t27);
 156     tt19 = t19 + t27;
 157     tt28 = c12 * (t20 - t28);
 158     tt20 = t20 + t28;
 159     tt29 = c13 * (t21 - t29);
 160     tt21 = t21 + t29;
 161     tt30 = c14 * (t22 - t30);
 162     tt22 = t22 + t30;
 163     tt31 = c15 * (t23 - t31);
 164     tt23 = t23 + t31;
 165     tt32 = c16 * (t24 - t32);
 166     tt24 = t24 + t32;
 167     /* 3rd stage */
 168     t5  = c5 * (tt1  - tt5 );
 169     t1  = tt1  + tt5;
 170     t6  = c6 * (tt2  - tt6 );
 171     t2  = tt2  + tt6;
 172     t7  = c7 * (tt3  - tt7 );
 173     t3  = tt3  + tt7;
 174     t8  = c8 * (tt4  - tt8 );
 175     t4  = tt4  + tt8;
 176     t13 = c5 * (tt9  - tt13);
 177     t9  = tt9  + tt13;
 178     t14 = c6 * (tt10 - tt14);
 179     t10 = tt10 + tt14;
 180     t15 = c7 * (tt11 - tt15);
 181     t11 = tt11 + tt15;
 182     t16 = c8 * (tt12 - tt16);
 183     t12 = tt12 + tt16;
 184     t21 = c5 * (tt17 - tt21);
 185     t17 = tt17 + tt21;
 186     t22 = c6 * (tt18 - tt22);
 187     t18 = tt18 + tt22;
 188     t23 = c7 * (tt19 - tt23);
 189     t19 = tt19 + tt23;
 190     t24 = c8 * (tt20 - tt24);
 191     t20 = tt20 + tt24;
 192     t29 = c5 * (tt25 - tt29);
 193     t25 = tt25 + tt29;
 194     t30 = c6 * (tt26 - tt30);
 195     t26 = tt26 + tt30;
 196     t31 = c7 * (tt27 - tt31);
 197     t27 = tt27 + tt31;
 198     t32 = c8 * (tt28 - tt32);
 199     t28 = tt28 + tt32;
 200     /* 4th stage */
 201     tt3  = c3 * (t1  - t3 );
 202     tt1  = t1  + t3;
 203     tt4  = c4 * (t2  - t4 );
 204     tt2  = t2  + t4;
 205     tt7  = c3 * (t5  - t7 );
 206     tt5  = t5  + t7;
 207     tt8  = c4 * (t6  - t8 );
 208     tt6  = t6  + t8;
 209     tt11 = c3 * (t9  - t11);
 210     tt9  = t9  + t11;
 211     tt12 = c4 * (t10 - t12);
 212     tt10 = t10 + t12;
 213     tt15 = c3 * (t13 - t15);
 214     tt13 = t13 + t15;
 215     tt16 = c4 * (t14 - t16);
 216     tt14 = t14 + t16;
 217     tt19 = c3 * (t17 - t19);
 218     tt17 = t17 + t19;
 219     tt20 = c4 * (t18 - t20);
 220     tt18 = t18 + t20;
 221     tt23 = c3 * (t21 - t23);
 222     tt21 = t21 + t23;
 223     tt24 = c4 * (t22 - t24);
 224     tt22 = t22 + t24;
 225     tt27 = c3 * (t25 - t27);
 226     tt25 = t25 + t27;
 227     tt28 = c4 * (t26 - t28);
 228     tt26 = t26 + t28;
 229     tt31 = c3 * (t29 - t31);
 230     tt29 = t29 + t31;
 231     tt32 = c4 * (t30 - t32);
 232     tt30 = t30 + t32;
 233     /* Bit-reverse ordering is integrated after the 5th stage */
 234     /* Begin to split the result of the DCT (t1 to t32) in the filter bank */
 235     x = b->actual + b->pos;
 236     y = (b->actual == b->v1 ? b->v2 : b->v1) + b->pos;
 237     x[0] = -(y[0] = c2 * (tt1  - tt2 )); /* t17 */
 238     x[256] = 0; y[256] = tt1  + tt2; /* t1  */
 239     t25 = c2 * (tt3  - tt4 );
 240     t9  = tt3  + tt4;
 241     t21 = c2 * (tt5  - tt6 );
 242     t5  = tt5  + tt6;
 243     t29 = c2 * (tt7  - tt8 );
 244     t13 = tt7  + tt8;
 245     t19 = c2 * (tt9  - tt10);
 246     t3  = tt9  + tt10;
 247     t27 = c2 * (tt11 - tt12);
 248     t11 = tt11 + tt12;
 249     t23 = c2 * (tt13 - tt14);
 250     t7  = tt13 + tt14;
 251     t31 = c2 * (tt15 - tt16);
 252     t15 = tt15 + tt16;
 253     t18 = c2 * (tt17 - tt18);
 254     t2  = tt17 + tt18;
 255     t26 = c2 * (tt19 - tt20);
 256     t10 = tt19 + tt20;
 257     t22 = c2 * (tt21 - tt22);
 258     t6  = tt21 + tt22;
 259     t30 = c2 * (tt23 - tt24);
 260     t14 = tt23 + tt24;
 261     t20 = c2 * (tt25 - tt26);
 262     t4  = tt25 + tt26;
 263     t28 = c2 * (tt27 - tt28);
 264     t12 = tt27 + tt28;
 265     t24 = c2 * (tt29 - tt30);
 266     t8  = tt29 + tt30;
 267     t32 = c2 * (tt31 - tt32);
 268     t16 = tt31 + tt32;
 269     /* Do the sums */
 270     /* Keep on splitting the result */
 271     y[384] = y[128] = t9 - (x[128] = -(x[384] = t25)); /* t25, t9  */
 272     t10 += t26;
 273     t11 += t27;
 274     t12 += t28;
 275     t13 += t29;
 276     t14 += t30;
 277     t15 += t31;
 278     t16 += t32;
 279     y[320] = y[192] = t5 + t13; /* t5  */
 280     y[448] = y[64] = t13 + t21; /* t13 */
 281     x[64] = -(x[448] = t21 - (x[192] = -(x[320] = t29))); /* t29, t21 */
 282     t6  += t14;
 283     t14 += t22;
 284     t22 += t30;
 285     t7  += t15;
 286     t15 += t23;
 287     t23 += t31;
 288     t8  += t16;
 289     t16 += t24;
 290     t24 += t32;
 291     y[288] = y[224] = t3 + t7; /* t3  */
 292     y[352] = y[160] = t7 + t11; /* t7  */
 293     y[416] = y[96] = t11 + t15; /* t11 */
 294     y[480] = y[32] = t15 + t19; /* t15 */
 295     x[32] = -(x[480] = t19 + t23); /* t19 */
 296     x[96] = -(x[416] = t23 + t27); /* t23 */
 297     x[160] = -(x[352] = t27 - (x[224] = -(x[288] = t31))); /* t31, t27 */
 298     t4  += t8 ;
 299     t8  += t12;
 300     t12 += t16;
 301     t16 += t20;
 302     t20 += t24;
 303     t24 += t28;
 304     t28 += t32;
 305     y[272] = y[240] = t2 + t4; /* t2  */
 306     y[304] = y[208] = t4 + t6; /* t4  */
 307     y[336] = y[176] = t6 + t8; /* t6  */
 308     y[368] = y[144] = t8 + t10; /* t8  */
 309     y[400] = y[112] = t10 + t12; /* t10 */
 310     y[432] = y[80] = t12 + t14; /* t12 */
 311     y[464] = y[48] = t14 + t16; /* t14 */
 312     y[496] = y[16] = t16 + t18; /* t16 */
 313     x[16] = -(x[496] = t18 + t20); /* t18 */
 314     x[48] = -(x[464] = t20 + t22); /* t20 */
 315     x[80] = -(x[432] = t22 + t24); /* t22 */
 316     x[112] = -(x[400] = t24 + t26); /* t24 */
 317     x[144] = -(x[368] = t26 + t28); /* t26 */
 318     x[176] = -(x[336] = t28 + t30); /* t28 */
 319     x[208] = -(x[304] = t30 - (x[240] = -(x[272] = t32))); /* t32, t30 */
 320     /* Note that to be really complete, the DCT should multiply t1 by sqrt(2)/N
 321        and t2 to t32 by 2/N, and would take 321 additions and multiplications.
 322        But that's unuseful in this application. */
 323 }
 324
 325
 326 /*****************************************************************************
 327  * PCM: Pulse Code Modulation
 328  *****************************************************************************
 329  * Compute 32 PCM samples with a convolution product
 330  *****************************************************************************/
 331
 332 void PCM(adec_bank_t *b, s16 **pcm, int jump)
 333 {
 334     /* scale factor */
 335 #define F 32768
 336     /* These values are not in the same order as in Annex 3-B.3 of the ISO/IEC
 337        DIS 11172-3 */
 338     static const float c[512] = {
 339         0.000000000 * F, -0.000442505 * F,  0.003250122 * F, -0.007003784 * F,
 340         0.031082153 * F, -0.078628540 * F,  0.100311279 * F, -0.572036743 * F,
 341         1.144989014 * F,  0.572036743 * F,  0.100311279 * F,  0.078628540 * F,
 342         0.031082153 * F,  0.007003784 * F,  0.003250122 * F,  0.000442505 * F,
 343        -0.000015259 * F, -0.000473022 * F,  0.003326416 * F, -0.007919312 * F,
 344         0.030517578 * F, -0.084182739 * F,  0.090927124 * F, -0.600219727 * F,
 345         1.144287109 * F,  0.543823242 * F,  0.108856201 * F,  0.073059082 * F,
 346         0.031478882 * F,  0.006118774 * F,  0.003173828 * F,  0.000396729 * F,
 347        -0.000015259 * F, -0.000534058 * F,  0.003387451 * F, -0.008865356 * F,
 348         0.029785156 * F, -0.089706421 * F,  0.080688477 * F, -0.628295898 * F,
 349         1.142211914 * F,  0.515609741 * F,  0.116577148 * F,  0.067520142 * F,
 350         0.031738281 * F,  0.005294800 * F,  0.003082275 * F,  0.000366211 * F,
 351        -0.000015259 * F, -0.000579834 * F,  0.003433228 * F, -0.009841919 * F,
 352         0.028884888 * F, -0.095169067 * F,  0.069595337 * F, -0.656219482 * F,
 353         1.138763428 * F,  0.487472534 * F,  0.123474121 * F,  0.061996460 * F,
 354         0.031845093 * F,  0.004486084 * F,  0.002990723 * F,  0.000320435 * F,
 355        -0.000015259 * F, -0.000625610 * F,  0.003463745 * F, -0.010848999 * F,
 356         0.027801514 * F, -0.100540161 * F,  0.057617188 * F, -0.683914185 * F,
 357         1.133926392 * F,  0.459472656 * F,  0.129577637 * F,  0.056533813 * F,
 358         0.031814575 * F,  0.003723145 * F,  0.002899170 * F,  0.000289917 * F,
 359        -0.000015259 * F, -0.000686646 * F,  0.003479004 * F, -0.011886597 * F,
 360         0.026535034 * F, -0.105819702 * F,  0.044784546 * F, -0.711318970 * F,
 361         1.127746582 * F,  0.431655884 * F,  0.134887695 * F,  0.051132202 * F,
 362         0.031661987 * F,  0.003005981 * F,  0.002792358 * F,  0.000259399 * F,
 363        -0.000015259 * F, -0.000747681 * F,  0.003479004 * F, -0.012939453 * F,
 364         0.025085449 * F, -0.110946655 * F,  0.031082153 * F, -0.738372803 * F,
 365         1.120223999 * F,  0.404083252 * F,  0.139450073 * F,  0.045837402 * F,
 366         0.031387329 * F,  0.002334595 * F,  0.002685547 * F,  0.000244141 * F,
 367        -0.000030518 * F, -0.000808716 * F,  0.003463745 * F, -0.014022827 * F,
 368         0.023422241 * F, -0.115921021 * F,  0.016510010 * F, -0.765029907 * F,
 369         1.111373901 * F,  0.376800537 * F,  0.143264771 * F,  0.040634155 * F,
 370         0.031005859 * F,  0.001693726 * F,  0.002578735 * F,  0.000213623 * F,
 371        -0.000030518 * F, -0.000885010 * F,  0.003417969 * F, -0.015121460 * F,
 372         0.021575928 * F, -0.120697021 * F,  0.001068115 * F, -0.791213989 * F,
 373         1.101211548 * F,  0.349868774 * F,  0.146362305 * F,  0.035552979 * F,
 374         0.030532837 * F,  0.001098633 * F,  0.002456665 * F,  0.000198364 * F,
 375        -0.000030518 * F, -0.000961304 * F,  0.003372192 * F, -0.016235352 * F,
 376         0.019531250 * F, -0.125259399 * F, -0.015228271 * F, -0.816864014 * F,
 377         1.089782715 * F,  0.323318481 * F,  0.148773193 * F,  0.030609131 * F,
 378         0.029937744 * F,  0.000549316 * F,  0.002349854 * F,  0.000167847 * F,
 379        -0.000030518 * F, -0.001037598 * F,  0.003280640 * F, -0.017349243 * F,
 380         0.017257690 * F, -0.129562378 * F, -0.032379150 * F, -0.841949463 * F,
 381         1.077117920 * F,  0.297210693 * F,  0.150497437 * F,  0.025817871 * F,
 382         0.029281616 * F,  0.000030518 * F,  0.002243042 * F,  0.000152588 * F,
 383        -0.000045776 * F, -0.001113892 * F,  0.003173828 * F, -0.018463135 * F,
 384         0.014801025 * F, -0.133590698 * F, -0.050354004 * F, -0.866363525 * F,
 385         1.063217163 * F,  0.271591187 * F,  0.151596069 * F,  0.021179199 * F,
 386         0.028533936 * F, -0.000442505 * F,  0.002120972 * F,  0.000137329 * F,
 387        -0.000045776 * F, -0.001205444 * F,  0.003051758 * F, -0.019577026 * F,
 388         0.012115479 * F, -0.137298584 * F, -0.069168091 * F, -0.890090942 * F,
 389         1.048156738 * F,  0.246505737 * F,  0.152069092 * F,  0.016708374 * F,
 390         0.027725220 * F, -0.000869751 * F,  0.002014160 * F,  0.000122070 * F,
 391        -0.000061035 * F, -0.001296997 * F,  0.002883911 * F, -0.020690918 * F,
 392         0.009231567 * F, -0.140670776 * F, -0.088775635 * F, -0.913055420 * F,
 393         1.031936646 * F,  0.221984863 * F,  0.151962280 * F,  0.012420654 * F,
 394         0.026840210 * F, -0.001266479 * F,  0.001907349 * F,  0.000106812 * F,
 395        -0.000061035 * F, -0.001388550 * F,  0.002700806 * F, -0.021789551 * F,
 396         0.006134033 * F, -0.143676758 * F, -0.109161377 * F, -0.935195923 * F,
 397         1.014617920 * F,  0.198059082 * F,  0.151306152 * F,  0.008316040 * F,
 398         0.025909424 * F, -0.001617432 * F,  0.001785278 * F,  0.000106812 * F,
 399        -0.000076294 * F, -0.001480103 * F,  0.002487183 * F, -0.022857666 * F,
 400         0.002822876 * F, -0.146255493 * F, -0.130310059 * F, -0.956481934 * F,
 401         0.996246338 * F,  0.174789429 * F,  0.150115967 * F,  0.004394531 * F,
 402         0.024932861 * F, -0.001937866 * F,  0.001693726 * F,  0.000091553 * F,
 403        -0.000076294 * F, -0.001586914 * F,  0.002227783 * F, -0.023910522 * F,
 404        -0.000686646 * F, -0.148422241 * F, -0.152206421 * F, -0.976852417 * F,
 405         0.976852417 * F,  0.152206421 * F,  0.148422241 * F,  0.000686646 * F,
 406         0.023910522 * F, -0.002227783 * F,  0.001586914 * F,  0.000076294 * F,
 407        -0.000091553 * F, -0.001693726 * F,  0.001937866 * F, -0.024932861 * F,
 408        -0.004394531 * F, -0.150115967 * F, -0.174789429 * F, -0.996246338 * F,
 409         0.956481934 * F,  0.130310059 * F,  0.146255493 * F, -0.002822876 * F,
 410         0.022857666 * F, -0.002487183 * F,  0.001480103 * F,  0.000076294 * F,
 411        -0.000106812 * F, -0.001785278 * F,  0.001617432 * F, -0.025909424 * F,
 412        -0.008316040 * F, -0.151306152 * F, -0.198059082 * F, -1.014617920 * F,
 413         0.935195923 * F,  0.109161377 * F,  0.143676758 * F, -0.006134033 * F,
 414         0.021789551 * F, -0.002700806 * F,  0.001388550 * F,  0.000061035 * F,
 415        -0.000106812 * F, -0.001907349 * F,  0.001266479 * F, -0.026840210 * F,
 416        -0.012420654 * F, -0.151962280 * F, -0.221984863 * F, -1.031936646 * F,
 417         0.913055420 * F,  0.088775635 * F,  0.140670776 * F, -0.009231567 * F,
 418         0.020690918 * F, -0.002883911 * F,  0.001296997 * F,  0.000061035 * F,
 419        -0.000122070 * F, -0.002014160 * F,  0.000869751 * F, -0.027725220 * F,
 420        -0.016708374 * F, -0.152069092 * F, -0.246505737 * F, -1.048156738 * F,
 421         0.890090942 * F,  0.069168091 * F,  0.137298584 * F, -0.012115479 * F,
 422         0.019577026 * F, -0.003051758 * F,  0.001205444 * F,  0.000045776 * F,
 423        -0.000137329 * F, -0.002120972 * F,  0.000442505 * F, -0.028533936 * F,
 424        -0.021179199 * F, -0.151596069 * F, -0.271591187 * F, -1.063217163 * F,
 425         0.866363525 * F,  0.050354004 * F,  0.133590698 * F, -0.014801025 * F,
 426         0.018463135 * F, -0.003173828 * F,  0.001113892 * F,  0.000045776 * F,
 427        -0.000152588 * F, -0.002243042 * F, -0.000030518 * F, -0.029281616 * F,
 428        -0.025817871 * F, -0.150497437 * F, -0.297210693 * F, -1.077117920 * F,
 429         0.841949463 * F,  0.032379150 * F,  0.129562378 * F, -0.017257690 * F,
 430         0.017349243 * F, -0.003280640 * F,  0.001037598 * F,  0.000030518 * F,
 431        -0.000167847 * F, -0.002349854 * F, -0.000549316 * F, -0.029937744 * F,
 432        -0.030609131 * F, -0.148773193 * F, -0.323318481 * F, -1.089782715 * F,
 433         0.816864014 * F,  0.015228271 * F,  0.125259399 * F, -0.019531250 * F,
 434         0.016235352 * F, -0.003372192 * F,  0.000961304 * F,  0.000030518 * F,
 435        -0.000198364 * F, -0.002456665 * F, -0.001098633 * F, -0.030532837 * F,
 436        -0.035552979 * F, -0.146362305 * F, -0.349868774 * F, -1.101211548 * F,
 437         0.791213989 * F, -0.001068115 * F,  0.120697021 * F, -0.021575928 * F,
 438         0.015121460 * F, -0.003417969 * F,  0.000885010 * F,  0.000030518 * F,
 439        -0.000213623 * F, -0.002578735 * F, -0.001693726 * F, -0.031005859 * F,
 440        -0.040634155 * F, -0.143264771 * F, -0.376800537 * F, -1.111373901 * F,
 441         0.765029907 * F, -0.016510010 * F,  0.115921021 * F, -0.023422241 * F,
 442         0.014022827 * F, -0.003463745 * F,  0.000808716 * F,  0.000030518 * F,
 443        -0.000244141 * F, -0.002685547 * F, -0.002334595 * F, -0.031387329 * F,
 444        -0.045837402 * F, -0.139450073 * F, -0.404083252 * F, -1.120223999 * F,
 445         0.738372803 * F, -0.031082153 * F,  0.110946655 * F, -0.025085449 * F,
 446         0.012939453 * F, -0.003479004 * F,  0.000747681 * F,  0.000015259 * F,
 447        -0.000259399 * F, -0.002792358 * F, -0.003005981 * F, -0.031661987 * F,
 448        -0.051132202 * F, -0.134887695 * F, -0.431655884 * F, -1.127746582 * F,
 449         0.711318970 * F, -0.044784546 * F,  0.105819702 * F, -0.026535034 * F,
 450         0.011886597 * F, -0.003479004 * F,  0.000686646 * F,  0.000015259 * F,
 451        -0.000289917 * F, -0.002899170 * F, -0.003723145 * F, -0.031814575 * F,
 452        -0.056533813 * F, -0.129577637 * F, -0.459472656 * F, -1.133926392 * F,
 453         0.683914185 * F, -0.057617188 * F,  0.100540161 * F, -0.027801514 * F,
 454         0.010848999 * F, -0.003463745 * F,  0.000625610 * F,  0.000015259 * F,
 455        -0.000320435 * F, -0.002990723 * F, -0.004486084 * F, -0.031845093 * F,
 456        -0.061996460 * F, -0.123474121 * F, -0.487472534 * F, -1.138763428 * F,
 457         0.656219482 * F, -0.069595337 * F,  0.095169067 * F, -0.028884888 * F,
 458         0.009841919 * F, -0.003433228 * F,  0.000579834 * F,  0.000015259 * F,
 459        -0.000366211 * F, -0.003082275 * F, -0.005294800 * F, -0.031738281 * F,
 460        -0.067520142 * F, -0.116577148 * F, -0.515609741 * F, -1.142211914 * F,
 461         0.628295898 * F, -0.080688477 * F,  0.089706421 * F, -0.029785156 * F,
 462         0.008865356 * F, -0.003387451 * F,  0.000534058 * F,  0.000015259 * F,
 463        -0.000396729 * F, -0.003173828 * F, -0.006118774 * F, -0.031478882 * F,
 464        -0.073059082 * F, -0.108856201 * F, -0.543823242 * F, -1.144287109 * F,
 465         0.600219727 * F, -0.090927124 * F,  0.084182739 * F, -0.030517578 * F,
 466         0.007919312 * F, -0.003326416 * F,  0.000473022 * F,  0.000015259 * F
 467         };
 468 #undef F
 469     int i;
 470     float tmp, *v;
 471     const float *f;
 472
 473     f = c;
 474
 475     switch(b->pos) {
 476         case 0:
 477             v = b->actual;
 478             for(i=0; i<32; i++) {
 479                 tmp = *f++ * *v;
 480                 v += 15;
 481                 tmp += *f++ * *v--;
 482                 tmp += *f++ * *v--;
 483                 tmp += *f++ * *v--;
 484                 tmp += *f++ * *v--;
 485                 tmp += *f++ * *v--;
 486                 tmp += *f++ * *v--;
 487                 tmp += *f++ * *v--;
 488                 tmp += *f++ * *v--;
 489                 tmp += *f++ * *v--;
 490                 tmp += *f++ * *v--;
 491                 tmp += *f++ * *v--;
 492                 tmp += *f++ * *v--;
 493                 tmp += *f++ * *v--;
 494                 tmp += *f++ * *v--;
 495                 if((tmp += *f++ * *v) > 32767)
 496                     /* ceiling saturation */
 497                     **pcm = 0x7FFF;
 498                 else
 499                     if(tmp < -32768)
 500                         /* floor saturation */
 501                         **pcm = 0x8000;
 502                     else
 503                         **pcm = (s16)tmp;
 504                 *pcm += jump;
 505                 v += 15;
 506             }
 507             break;
 508         case 1:
 509             v = b->actual + 1;
 510             for(i=0; i<32; i++) {
 511                 tmp = *f++ * *v--;
 512                 tmp += *f++ * *v;
 513                 v += 15;
 514                 tmp += *f++ * *v--;
 515                 tmp += *f++ * *v--;
 516                 tmp += *f++ * *v--;
 517                 tmp += *f++ * *v--;
 518                 tmp += *f++ * *v--;
 519                 tmp += *f++ * *v--;
 520                 tmp += *f++ * *v--;
 521                 tmp += *f++ * *v--;
 522                 tmp += *f++ * *v--;
 523                 tmp += *f++ * *v--;
 524                 tmp += *f++ * *v--;
 525                 tmp += *f++ * *v--;
 526                 tmp += *f++ * *v--;
 527                 if((tmp += *f++ * *v) > 32767)
 528                     **pcm = 0x7FFF;
 529                 else
 530                     if(tmp < -32768)
 531                         **pcm = 0x8000;
 532                     else
 533                         **pcm = (s16)tmp;
 534                 *pcm += jump;
 535                 v += 15;
 536             }
 537             break;
 538         case 2:
 539             v = b->actual + 2;
 540             for(i=0; i<32; i++) {
 541                 tmp = *f++ * *v--;
 542                 tmp += *f++ * *v--;
 543                 tmp += *f++ * *v;
 544                 v += 15;
 545                 tmp += *f++ * *v--;
 546                 tmp += *f++ * *v--;
 547                 tmp += *f++ * *v--;
 548                 tmp += *f++ * *v--;
 549                 tmp += *f++ * *v--;
 550                 tmp += *f++ * *v--;
 551                 tmp += *f++ * *v--;
 552                 tmp += *f++ * *v--;
 553                 tmp += *f++ * *v--;
 554                 tmp += *f++ * *v--;
 555                 tmp += *f++ * *v--;
 556                 tmp += *f++ * *v--;
 557                 if((tmp += *f++ * *v) > 32767)
 558                     **pcm = 0x7FFF;
 559                 else
 560                     if(tmp < -32768)
 561                         **pcm = 0x8000;
 562                     else
 563                         **pcm = (s16)tmp;
 564                 *pcm += jump;
 565                 v += 15;
 566             }
 567             break;
 568         case 3:
 569             v = b->actual + 3;
 570             for(i=0; i<32; i++) {
 571                 tmp = *f++ * *v--;
 572                 tmp += *f++ * *v--;
 573                 tmp += *f++ * *v--;
 574                 tmp += *f++ * *v;
 575                 v += 15;
 576                 tmp += *f++ * *v--;
 577                 tmp += *f++ * *v--;
 578                 tmp += *f++ * *v--;
 579                 tmp += *f++ * *v--;
 580                 tmp += *f++ * *v--;
 581                 tmp += *f++ * *v--;
 582                 tmp += *f++ * *v--;
 583                 tmp += *f++ * *v--;
 584                 tmp += *f++ * *v--;
 585                 tmp += *f++ * *v--;
 586                 tmp += *f++ * *v--;
 587                 if((tmp += *f++ * *v) > 32767)
 588                     **pcm = 0x7FFF;
 589                 else
 590                     if(tmp < -32768)
 591                         **pcm = 0x8000;
 592                     else
 593                         **pcm = (s16)tmp;
 594                 *pcm += jump;
 595                 v += 15;
 596             }
 597             break;
 598         case 4:
 599             v = b->actual + 4;
 600             for(i=0; i<32; i++) {
 601                 tmp = *f++ * *v--;
 602                 tmp += *f++ * *v--;
 603                 tmp += *f++ * *v--;
 604                 tmp += *f++ * *v--;
 605                 tmp += *f++ * *v;
 606                 v += 15;
 607                 tmp += *f++ * *v--;
 608                 tmp += *f++ * *v--;
 609                 tmp += *f++ * *v--;
 610                 tmp += *f++ * *v--;
 611                 tmp += *f++ * *v--;
 612                 tmp += *f++ * *v--;
 613                 tmp += *f++ * *v--;
 614                 tmp += *f++ * *v--;
 615                 tmp += *f++ * *v--;
 616                 tmp += *f++ * *v--;
 617                 if((tmp += *f++ * *v) > 32767)
 618                     **pcm = 0x7FFF;
 619                 else
 620                     if(tmp < -32768)
 621                         **pcm = 0x8000;
 622                     else
 623                         **pcm = (s16)tmp;
 624                 *pcm += jump;
 625                 v += 15;
 626             }
 627             break;
 628         case 5:
 629             v = b->actual + 5;
 630             for(i=0; i<32; i++) {
 631                 tmp = *f++ * *v--;
 632                 tmp += *f++ * *v--;
 633                 tmp += *f++ * *v--;
 634                 tmp += *f++ * *v--;
 635                 tmp += *f++ * *v--;
 636                 tmp += *f++ * *v;
 637                 v += 15;
 638                 tmp += *f++ * *v--;
 639                 tmp += *f++ * *v--;
 640                 tmp += *f++ * *v--;
 641                 tmp += *f++ * *v--;
 642                 tmp += *f++ * *v--;
 643                 tmp += *f++ * *v--;
 644                 tmp += *f++ * *v--;
 645                 tmp += *f++ * *v--;
 646                 tmp += *f++ * *v--;
 647                 if((tmp += *f++ * *v) > 32767)
 648                     **pcm = 0x7FFF;
 649                 else
 650                     if(tmp < -32768)
 651                         **pcm = 0x8000;
 652                     else
 653                         **pcm = (s16)tmp;
 654                 *pcm += jump;
 655                 v += 15;
 656             }
 657             break;
 658         case 6:
 659             v = b->actual + 6;
 660             for(i=0; i<32; i++) {
 661                 tmp = *f++ * *v--;
 662                 tmp += *f++ * *v--;
 663                 tmp += *f++ * *v--;
 664                 tmp += *f++ * *v--;
 665                 tmp += *f++ * *v--;
 666                 tmp += *f++ * *v--;
 667                 tmp += *f++ * *v;
 668                 v += 15;
 669                 tmp += *f++ * *v--;
 670                 tmp += *f++ * *v--;
 671                 tmp += *f++ * *v--;
 672                 tmp += *f++ * *v--;
 673                 tmp += *f++ * *v--;
 674                 tmp += *f++ * *v--;
 675                 tmp += *f++ * *v--;
 676                 tmp += *f++ * *v--;
 677                 if((tmp += *f++ * *v) > 32767)
 678                     **pcm = 0x7FFF;
 679                 else
 680                     if(tmp < -32768)
 681                         **pcm = 0x8000;
 682                     else
 683                         **pcm = (s16)tmp;
 684                 *pcm += jump;
 685                 v += 15;
 686             }
 687             break;
 688         case 7:
 689             v = b->actual + 7;
 690             for(i=0; i<32; i++) {
 691                 tmp = *f++ * *v--;
 692                 tmp += *f++ * *v--;
 693                 tmp += *f++ * *v--;
 694                 tmp += *f++ * *v--;
 695                 tmp += *f++ * *v--;
 696                 tmp += *f++ * *v--;
 697                 tmp += *f++ * *v--;
 698                 tmp += *f++ * *v;
 699                 v += 15;
 700                 tmp += *f++ * *v--;
 701                 tmp += *f++ * *v--;
 702                 tmp += *f++ * *v--;
 703                 tmp += *f++ * *v--;
 704                 tmp += *f++ * *v--;
 705                 tmp += *f++ * *v--;
 706                 tmp += *f++ * *v--;
 707                 if((tmp += *f++ * *v) > 32767)
 708                     **pcm = 0x7FFF;
 709                 else
 710                     if(tmp < -32768)
 711                         **pcm = 0x8000;
 712                     else
 713                         **pcm = (s16)tmp;
 714                 *pcm += jump;
 715                 v += 15;
 716             }
 717             break;
 718         case 8:
 719             v = b->actual + 8;
 720             for(i=0; i<32; i++) {
 721                 tmp = *f++ * *v--;
 722                 tmp += *f++ * *v--;
 723                 tmp += *f++ * *v--;
 724                 tmp += *f++ * *v--;
 725                 tmp += *f++ * *v--;
 726                 tmp += *f++ * *v--;
 727                 tmp += *f++ * *v--;
 728                 tmp += *f++ * *v--;
 729                 tmp += *f++ * *v;
 730                 v += 15;
 731                 tmp += *f++ * *v--;
 732                 tmp += *f++ * *v--;
 733                 tmp += *f++ * *v--;
 734                 tmp += *f++ * *v--;
 735                 tmp += *f++ * *v--;
 736                 tmp += *f++ * *v--;
 737                 if((tmp += *f++ * *v) > 32767)
 738                     **pcm = 0x7FFF;
 739                 else
 740                     if(tmp < -32768)
 741                         **pcm = 0x8000;
 742                     else
 743                         **pcm = (s16)tmp;
 744                 *pcm += jump;
 745                 v += 15;
 746             }
 747             break;
 748         case 9:
 749             v = b->actual + 9;
 750             for(i=0; i<32; i++) {
 751                 tmp = *f++ * *v--;
 752                 tmp += *f++ * *v--;
 753                 tmp += *f++ * *v--;
 754                 tmp += *f++ * *v--;
 755                 tmp += *f++ * *v--;
 756                 tmp += *f++ * *v--;
 757                 tmp += *f++ * *v--;
 758                 tmp += *f++ * *v--;
 759                 tmp += *f++ * *v--;
 760                 tmp += *f++ * *v;
 761                 v += 15;
 762                 tmp += *f++ * *v--;
 763                 tmp += *f++ * *v--;
 764                 tmp += *f++ * *v--;
 765                 tmp += *f++ * *v--;
 766                 tmp += *f++ * *v--;
 767                 if((tmp += *f++ * *v) > 32767)
 768                     **pcm = 0x7FFF;
 769                 else
 770                     if(tmp < -32768)
 771                         **pcm = 0x8000;
 772                     else
 773                         **pcm = (s16)tmp;
 774                 *pcm += jump;
 775                 v += 15;
 776             }
 777             break;
 778         case 10:
 779             v = b->actual + 10;
 780             for(i=0; i<32; i++) {
 781                 tmp = *f++ * *v--;
 782                 tmp += *f++ * *v--;
 783                 tmp += *f++ * *v--;
 784                 tmp += *f++ * *v--;
 785                 tmp += *f++ * *v--;
 786                 tmp += *f++ * *v--;
 787                 tmp += *f++ * *v--;
 788                 tmp += *f++ * *v--;
 789                 tmp += *f++ * *v--;
 790                 tmp += *f++ * *v--;
 791                 tmp += *f++ * *v;
 792                 v += 15;
 793                 tmp += *f++ * *v--;
 794                 tmp += *f++ * *v--;
 795                 tmp += *f++ * *v--;
 796                 tmp += *f++ * *v--;
 797                 if((tmp += *f++ * *v) > 32767)
 798                     **pcm = 0x7FFF;
 799                 else
 800                     if(tmp < -32768)
 801                         **pcm = 0x8000;
 802                     else
 803                         **pcm = (s16)tmp;
 804                 *pcm += jump;
 805                 v += 15;
 806             }
 807             break;
 808         case 11:
 809             v = b->actual + 11;
 810             for(i=0; i<32; i++) {
 811                 tmp = *f++ * *v--;
 812                 tmp += *f++ * *v--;
 813                 tmp += *f++ * *v--;
 814                 tmp += *f++ * *v--;
 815                 tmp += *f++ * *v--;
 816                 tmp += *f++ * *v--;
 817                 tmp += *f++ * *v--;
 818                 tmp += *f++ * *v--;
 819                 tmp += *f++ * *v--;
 820                 tmp += *f++ * *v--;
 821                 tmp += *f++ * *v--;
 822                 tmp += *f++ * *v;
 823                 v += 15;
 824                 tmp += *f++ * *v--;
 825                 tmp += *f++ * *v--;
 826                 tmp += *f++ * *v--;
 827                 if((tmp += *f++ * *v) > 32767)
 828                     **pcm = 0x7FFF;
 829                 else
 830                     if(tmp < -32768)
 831                         **pcm = 0x8000;
 832                     else
 833                         **pcm = (s16)tmp;
 834                 *pcm += jump;
 835                 v += 15;
 836             }
 837             break;
 838         case 12:
 839             v = b->actual + 12;
 840             for(i=0; i<32; i++) {
 841                 tmp = *f++ * *v--;
 842                 tmp += *f++ * *v--;
 843                 tmp += *f++ * *v--;
 844                 tmp += *f++ * *v--;
 845                 tmp += *f++ * *v--;
 846                 tmp += *f++ * *v--;
 847                 tmp += *f++ * *v--;
 848                 tmp += *f++ * *v--;
 849                 tmp += *f++ * *v--;
 850                 tmp += *f++ * *v--;
 851                 tmp += *f++ * *v--;
 852                 tmp += *f++ * *v--;
 853                 tmp += *f++ * *v;
 854                 v += 15;
 855                 tmp += *f++ * *v--;
 856                 tmp += *f++ * *v--;
 857                 if((tmp += *f++ * *v) > 32767)
 858                     **pcm = 0x7FFF;
 859                 else
 860                     if(tmp < -32768)
 861                         **pcm = 0x8000;
 862                     else
 863                         **pcm = (s16)tmp;
 864                 *pcm += jump;
 865                 v += 15;
 866             }
 867             break;
 868         case 13:
 869             v = b->actual + 13;
 870             for(i=0; i<32; i++) {
 871                 tmp = *f++ * *v--;
 872                 tmp += *f++ * *v--;
 873                 tmp += *f++ * *v--;
 874                 tmp += *f++ * *v--;
 875                 tmp += *f++ * *v--;
 876                 tmp += *f++ * *v--;
 877                 tmp += *f++ * *v--;
 878                 tmp += *f++ * *v--;
 879                 tmp += *f++ * *v--;
 880                 tmp += *f++ * *v--;
 881                 tmp += *f++ * *v--;
 882                 tmp += *f++ * *v--;
 883                 tmp += *f++ * *v--;
 884                 tmp += *f++ * *v;
 885                 v += 15;
 886                 tmp += *f++ * *v--;
 887                 if((tmp += *f++ * *v) > 32767)
 888                     **pcm = 0x7FFF;
 889                 else
 890                     if(tmp < -32768)
 891                         **pcm = 0x8000;
 892                     else
 893                         **pcm = (s16)tmp;
 894                 *pcm += jump;
 895                 v += 15;
 896             }
 897             break;
 898         case 14:
 899             v = b->actual + 14;
 900             for(i=0; i<32; i++) {
 901                 tmp = *f++ * *v--;
 902                 tmp += *f++ * *v--;
 903                 tmp += *f++ * *v--;
 904                 tmp += *f++ * *v--;
 905                 tmp += *f++ * *v--;
 906                 tmp += *f++ * *v--;
 907                 tmp += *f++ * *v--;
 908                 tmp += *f++ * *v--;
 909                 tmp += *f++ * *v--;
 910                 tmp += *f++ * *v--;
 911                 tmp += *f++ * *v--;
 912                 tmp += *f++ * *v--;
 913                 tmp += *f++ * *v--;
 914                 tmp += *f++ * *v--;
 915                 tmp += *f++ * *v;
 916                 v += 15;
 917                 if((tmp += *f++ * *v) > 32767)
 918                     **pcm = 0x7FFF;
 919                 else
 920                     if(tmp < -32768)
 921                         **pcm = 0x8000;
 922                     else
 923                         **pcm = (s16)tmp;
 924                 *pcm += jump;
 925                 v += 15;
 926             }
 927             break;
 928         case 15:
 929             v = b->actual + 15;
 930             for(i=0; i<32; i++) {
 931                 tmp = *f++ * *v--;
 932                 tmp += *f++ * *v--;
 933                 tmp += *f++ * *v--;
 934                 tmp += *f++ * *v--;
 935                 tmp += *f++ * *v--;
 936                 tmp += *f++ * *v--;
 937                 tmp += *f++ * *v--;
 938                 tmp += *f++ * *v--;
 939                 tmp += *f++ * *v--;
 940                 tmp += *f++ * *v--;
 941                 tmp += *f++ * *v--;
 942                 tmp += *f++ * *v--;
 943                 tmp += *f++ * *v--;
 944                 tmp += *f++ * *v--;
 945                 tmp += *f++ * *v--;
 946                 if((tmp += *f++ * *v) > 32767)
 947                     **pcm = 0x7FFF;
 948                 else
 949                     if(tmp < -32768)
 950                         **pcm = 0x8000;
 951                     else
 952                         **pcm = (s16)tmp;
 953                 *pcm += jump;
 954                 v += 31;
 955             }
 956             break;
 957     }
 958
 959     /* Set the next position in the filter bank */
 960     b->pos++;
 961     b->pos &= 15;
 962     b->actual = (b->actual == b->v1 ? b->v2 : b->v1);
 963 }