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