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SynthesisFilter.java

/*
 * 11/19/04 1.0 moved to LGPL.
 * 
 * 04/01/00 Fixes for running under build 23xx Microsoft JVM. mdm.
 * 
 * 19/12/99 Performance improvements to compute_pcm_samples().  
 *                Mat McGowan. mdm@techie.com. 
 *
 * 16/02/99 Java Conversion by E.B , javalayer@javazoom.net
 *
 *  @(#) synthesis_filter.h 1.8, last edit: 6/15/94 16:52:00
 *  @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de)
 *  @(#) Berlin University of Technology
 *
 *-----------------------------------------------------------------------
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as published
 *   by the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *----------------------------------------------------------------------
 */
package javazoom.jl.decoder;

import java.io.IOException;

/**
 * A class for the synthesis filter bank.
 * This class does a fast downsampling from 32, 44.1 or 48 kHz to 8 kHz, if ULAW is defined.
 * Frequencies above 4 kHz are removed by ignoring higher subbands.
 */
00040 final class SynthesisFilter
{
  private float[]                    v1;
  private float[]              v2;
  private float[]              actual_v;              // v1 or v2
  private int                        actual_write_pos;      // 0-15
  private float[]              samples;               // 32 new subband samples
  private int                        channel;
  private float                scalefactor;
  private float[]              eq;
      
      /**
       * Quality value for controlling CPU usage/quality tradeoff. 
       */
      /*
      private int                   quality;
      
      private int                   v_inc;
      
      
      
      public static final int HIGH_QUALITY = 1;
      public static final int MEDIUM_QUALITY = 2;
      public static final int LOW_QUALITY = 4;
      */
      
  /**
   * Contructor.
   * The scalefactor scales the calculated float pcm samples to short values
   * (raw pcm samples are in [-1.0, 1.0], if no violations occur).
   */
00071   public SynthesisFilter(int channelnumber, float factor, float[] eq0)
  {    
        if (d==null)
        {
                  d = load_d();
                  d16 = splitArray(d, 16);
        }
        
        v1 = new float[512];
       v2 = new float[512];
       samples = new float[32];
     channel = channelnumber;
       scalefactor = factor;
       setEQ(eq);  
       //setQuality(HIGH_QUALITY);
       
     reset();
  }
  
  public void setEQ(float[] eq0)
  {
       this.eq = eq0;    
       if (eq==null)
       {
             eq = new float[32];
             for (int i=0; i<32; i++)
                   eq[i] = 1.0f;
       }
       if (eq.length<32)
       {
            throw new IllegalArgumentException("eq0");       
       }
        
  }
  
      /*
      private void setQuality(int quality0)
      {
            switch (quality0)
            {           
            case HIGH_QUALITY:
            case MEDIUM_QUALITY:
            case LOW_QUALITY:                                 
                  v_inc = 16 * quality0;              
                  quality = quality0;
                  break;      
            default :
                  throw new IllegalArgumentException("Unknown quality value");
            }                       
      }
      
      public int getQuality()
      {
            return quality;   
      }
      */
  
  /**
   * Reset the synthesis filter.
   */
00131   public void reset()
  {
     //float[] floatp;
       // float[] floatp2;

     // initialize v1[] and v2[]:
     //for (floatp = v1 + 512, floatp2 = v2 + 512; floatp > v1; )
       //   *--floatp = *--floatp2 = 0.0;
       for (int p=0;p<512;p++) 
             v1[p] = v2[p] = 0.0f;

     // initialize samples[]:
     //for (floatp = samples + 32; floatp > samples; )
       //  *--floatp = 0.0;
       for (int p2=0;p2<32;p2++) 
             samples[p2] = 0.0f;

     actual_v = v1;
     actual_write_pos = 15;
  }


  /**
   * Inject Sample.
   */
00156   public void input_sample(float sample, int subbandnumber)
  {                       
        samples[subbandnumber] = eq[subbandnumber]*sample;
  }

  public void input_samples(float[] s)
  {
        for (int i=31; i>=0; i--)
        {         
             samples[i] = s[i]*eq[i];
        }
  }
  
  /**
   * Compute new values via a fast cosine transform.
   */
00172   private void compute_new_v()
  {
      // p is fully initialized from x1
       //float[] p = _p;
       // pp is fully initialized from p
       //float[] pp = _pp; 
        
       //float[] new_v = _new_v;
        
      //float[] new_v = new float[32]; // new V[0-15] and V[33-48] of Figure 3-A.2 in ISO DIS 11172-3
      //float[] p = new float[16];
      //float[] pp = new float[16];
        
       /*
       for (int i=31; i>=0; i--)
       {
             new_v[i] = 0.0f;
       }
        */
        
      float new_v0, new_v1, new_v2, new_v3, new_v4, new_v5, new_v6, new_v7, new_v8, new_v9;
      float new_v10, new_v11, new_v12, new_v13, new_v14, new_v15, new_v16, new_v17, new_v18, new_v19;
      float new_v20, new_v21, new_v22, new_v23, new_v24, new_v25, new_v26, new_v27, new_v28, new_v29;
      float new_v30, new_v31;
        
      new_v0 = new_v1 = new_v2 = new_v3 = new_v4 = new_v5 = new_v6 = new_v7 = new_v8 = new_v9 = 
      new_v10 = new_v11 = new_v12 = new_v13 = new_v14 = new_v15 = new_v16 = new_v17 = new_v18 = new_v19 = 
      new_v20 = new_v21 = new_v22 = new_v23 = new_v24 = new_v25 = new_v26 = new_v27 = new_v28 = new_v29 = 
      new_v30 = new_v31 = 0.0f;
      
      
//    float[] new_v = new float[32]; // new V[0-15] and V[33-48] of Figure 3-A.2 in ISO DIS 11172-3
//    float[] p = new float[16];
//    float[] pp = new float[16];

    float[] s = samples;
      
      float s0 = s[0];
      float s1 = s[1];
      float s2 = s[2];
      float s3 = s[3];
      float s4 = s[4];
      float s5 = s[5];
      float s6 = s[6];
      float s7 = s[7];
      float s8 = s[8];
      float s9 = s[9];
      float s10 = s[10];      
      float s11 = s[11];
      float s12 = s[12];
      float s13 = s[13];
      float s14 = s[14];
      float s15 = s[15];
      float s16 = s[16];
      float s17 = s[17];
      float s18 = s[18];
      float s19 = s[19];
      float s20 = s[20];      
      float s21 = s[21];
      float s22 = s[22];
      float s23 = s[23];
      float s24 = s[24];
      float s25 = s[25];
      float s26 = s[26];
      float s27 = s[27];
      float s28 = s[28];
      float s29 = s[29];
      float s30 = s[30];      
      float s31 = s[31];
            
      float p0 = s0 + s31;
      float p1 = s1 + s30;
      float p2 = s2 + s29;
      float p3 = s3 + s28;
      float p4 = s4 + s27;
      float p5 = s5 + s26;
      float p6 = s6 + s25;
      float p7 = s7 + s24;
      float p8 = s8 + s23;
      float p9 = s9 + s22;
      float p10 = s10 + s21;
      float p11 = s11 + s20;
      float p12 = s12 + s19;
      float p13 = s13 + s18;
      float p14 = s14 + s17;
      float p15 = s15 + s16;
      
      float pp0 = p0 + p15;
      float pp1 = p1 + p14;
      float pp2 = p2 + p13;
      float pp3 = p3 + p12;
      float pp4 = p4 + p11;
      float pp5 = p5 + p10;
      float pp6 = p6 + p9;
      float pp7 = p7 + p8;
      float pp8 = (p0 - p15) * cos1_32;
      float pp9 = (p1 - p14) * cos3_32;
      float pp10 = (p2 - p13) * cos5_32;
      float pp11 = (p3 - p12) * cos7_32;
      float pp12 = (p4 - p11) * cos9_32;
      float pp13 = (p5 - p10) * cos11_32;
      float pp14 = (p6 - p9) * cos13_32;
      float pp15 = (p7 - p8) * cos15_32;

      p0 = pp0 + pp7;
      p1 = pp1 + pp6;
      p2 = pp2 + pp5;
      p3 = pp3 + pp4;
      p4 = (pp0 - pp7) * cos1_16;
      p5 = (pp1 - pp6) * cos3_16;
      p6 = (pp2 - pp5) * cos5_16;
      p7 = (pp3 - pp4) * cos7_16;
      p8 = pp8 + pp15;
      p9 = pp9 + pp14;
      p10 = pp10 + pp13;
      p11 = pp11 + pp12;
      p12 = (pp8 - pp15) * cos1_16;
      p13 = (pp9 - pp14) * cos3_16;
      p14 = (pp10 - pp13) * cos5_16;
      p15 = (pp11 - pp12) * cos7_16;
      

      pp0 = p0 + p3;
      pp1 = p1 + p2;
      pp2 = (p0 - p3) * cos1_8;
      pp3 = (p1 - p2) * cos3_8;
      pp4 = p4 + p7;
      pp5 = p5 + p6;
      pp6 = (p4 - p7) * cos1_8;
      pp7 = (p5 - p6) * cos3_8;
      pp8 = p8 + p11;
      pp9 = p9 + p10;
      pp10 = (p8 - p11) * cos1_8;
      pp11 = (p9 - p10) * cos3_8;
      pp12 = p12 + p15;
      pp13 = p13 + p14;
      pp14 = (p12 - p15) * cos1_8;
      pp15 = (p13 - p14) * cos3_8;

      p0 = pp0 + pp1;
      p1 = (pp0 - pp1) * cos1_4;
      p2 = pp2 + pp3;
      p3 = (pp2 - pp3) * cos1_4;
      p4 = pp4 + pp5;
      p5 = (pp4 - pp5) * cos1_4;
      p6 = pp6 + pp7;
      p7 = (pp6 - pp7) * cos1_4;
      p8 = pp8 + pp9;
      p9 = (pp8 - pp9) * cos1_4;
      p10 = pp10 + pp11;
      p11 = (pp10 - pp11) * cos1_4;
      p12 = pp12 + pp13;
      p13 = (pp12 - pp13) * cos1_4;
      p14 = pp14 + pp15;
      p15 = (pp14 - pp15) * cos1_4;

      // this is pretty insane coding
      float tmp1;
      new_v19/*36-17*/ = -(new_v4 = (new_v12 = p7) + p5) - p6;
      new_v27/*44-17*/ = -p6 - p7 - p4;
      new_v6 = (new_v10 = (new_v14 = p15) + p11) + p13;
      new_v17/*34-17*/ = -(new_v2 = p15 + p13 + p9) - p14;
      new_v21/*38-17*/ = (tmp1 = -p14 - p15 - p10 - p11) - p13;
      new_v29/*46-17*/ = -p14 - p15 - p12 - p8;
      new_v25/*42-17*/ = tmp1 - p12;
      new_v31/*48-17*/ = -p0;
      new_v0 = p1;
      new_v23/*40-17*/ = -(new_v8 = p3) - p2;
      
      p0 = (s0 - s31) * cos1_64;
      p1 = (s1 - s30) * cos3_64;
      p2 = (s2 - s29) * cos5_64;
      p3 = (s3 - s28) * cos7_64;
      p4 = (s4 - s27) * cos9_64;
      p5 = (s5 - s26) * cos11_64;
      p6 = (s6 - s25) * cos13_64;
      p7 = (s7 - s24) * cos15_64;
      p8 = (s8 - s23) * cos17_64;
      p9 = (s9 - s22) * cos19_64;
      p10 = (s10 - s21) * cos21_64;
      p11 = (s11 - s20) * cos23_64;
      p12 = (s12 - s19) * cos25_64;
      p13 = (s13 - s18) * cos27_64;
      p14 = (s14 - s17) * cos29_64;
      p15 = (s15 - s16) * cos31_64;

      
      pp0 = p0 + p15;
      pp1 = p1 + p14;
      pp2 = p2 + p13;
      pp3 = p3 + p12;
      pp4 = p4 + p11;
      pp5 = p5 + p10;
      pp6 = p6 + p9;
      pp7 = p7 + p8;
      pp8 = (p0 - p15) * cos1_32;
      pp9 = (p1 - p14) * cos3_32;
      pp10 = (p2 - p13) * cos5_32;
      pp11 = (p3 - p12) * cos7_32;
      pp12 = (p4 - p11) * cos9_32;
      pp13 = (p5 - p10) * cos11_32;
      pp14 = (p6 - p9) * cos13_32;
      pp15 = (p7 - p8) * cos15_32;
      

      p0 = pp0 + pp7;
      p1 = pp1 + pp6;
      p2 = pp2 + pp5;
      p3 = pp3 + pp4;
      p4 = (pp0 - pp7) * cos1_16;
      p5 = (pp1 - pp6) * cos3_16;
      p6 = (pp2 - pp5) * cos5_16;
      p7 = (pp3 - pp4) * cos7_16;
      p8 = pp8 + pp15;
      p9 = pp9 + pp14;
      p10 = pp10 + pp13;
      p11 = pp11 + pp12;
      p12 = (pp8 - pp15) * cos1_16;
      p13 = (pp9 - pp14) * cos3_16;
      p14 = (pp10 - pp13) * cos5_16;
      p15 = (pp11 - pp12) * cos7_16;


      pp0 = p0 + p3;
      pp1 = p1 + p2;
      pp2 = (p0 - p3) * cos1_8;
      pp3 = (p1 - p2) * cos3_8;
      pp4 = p4 + p7;
      pp5 = p5 + p6;
      pp6 = (p4 - p7) * cos1_8;
      pp7 = (p5 - p6) * cos3_8;
      pp8 = p8 + p11;
      pp9 = p9 + p10;
      pp10 = (p8 - p11) * cos1_8;
      pp11 = (p9 - p10) * cos3_8;
      pp12 = p12 + p15;
      pp13 = p13 + p14;
      pp14 = (p12 - p15) * cos1_8;
      pp15 = (p13 - p14) * cos3_8;

      
      p0 = pp0 + pp1;
      p1 = (pp0 - pp1) * cos1_4;
      p2 = pp2 + pp3;
      p3 = (pp2 - pp3) * cos1_4;
      p4 = pp4 + pp5;
      p5 = (pp4 - pp5) * cos1_4;
      p6 = pp6 + pp7;
      p7 = (pp6 - pp7) * cos1_4;
      p8 = pp8 + pp9;
      p9 = (pp8 - pp9) * cos1_4;
      p10 = pp10 + pp11;
      p11 = (pp10 - pp11) * cos1_4;
      p12 = pp12 + pp13;
      p13 = (pp12 - pp13) * cos1_4;
      p14 = pp14 + pp15;
      p15 = (pp14 - pp15) * cos1_4;
      

      // manually doing something that a compiler should handle sucks
      // coding like this is hard to read
      float tmp2;
      new_v5 = (new_v11 = (new_v13 = (new_v15 = p15) + p7) + p11)
                                          + p5 + p13;
      new_v7 = (new_v9 = p15 + p11 + p3) + p13;
      new_v16/*33-17*/ = -(new_v1 = (tmp1 = p13 + p15 + p9) + p1) - p14;
      new_v18/*35-17*/ = -(new_v3 = tmp1 + p5 + p7) - p6 - p14;

      new_v22/*39-17*/ = (tmp1 = -p10 - p11 - p14 - p15)
                                                      - p13 - p2 - p3;
      new_v20/*37-17*/ = tmp1 - p13 - p5 - p6 - p7;
      new_v24/*41-17*/ = tmp1 - p12 - p2 - p3;
      new_v26/*43-17*/ = tmp1 - p12 - (tmp2 = p4 + p6 + p7);
      new_v30/*47-17*/ = (tmp1 = -p8 - p12 - p14 - p15) - p0;
      new_v28/*45-17*/ = tmp1 - tmp2;

      // insert V[0-15] (== new_v[0-15]) into actual v:     
      // float[] x2 = actual_v + actual_write_pos;
      float dest[] = actual_v;
      
      int pos = actual_write_pos;
      
      dest[0 + pos] = new_v0;
      dest[16 + pos] = new_v1;
      dest[32 + pos] = new_v2;
      dest[48 + pos] = new_v3;
      dest[64 + pos] = new_v4;
      dest[80 + pos] = new_v5;
      dest[96 + pos] = new_v6;
      dest[112 + pos] = new_v7;
      dest[128 + pos] = new_v8;
      dest[144 + pos] = new_v9;
      dest[160 + pos] = new_v10;
      dest[176 + pos] = new_v11;
      dest[192 + pos] = new_v12;
      dest[208 + pos] = new_v13;
      dest[224 + pos] = new_v14;
      dest[240 + pos] = new_v15;

      // V[16] is always 0.0:
      dest[256 + pos] = 0.0f;

      // insert V[17-31] (== -new_v[15-1]) into actual v:
      dest[272 + pos] = -new_v15;
      dest[288 + pos] = -new_v14;
      dest[304 + pos] = -new_v13;
      dest[320 + pos] = -new_v12;
      dest[336 + pos] = -new_v11;
      dest[352 + pos] = -new_v10;
      dest[368 + pos] = -new_v9;
      dest[384 + pos] = -new_v8;
      dest[400 + pos] = -new_v7;
      dest[416 + pos] = -new_v6;
      dest[432 + pos] = -new_v5;
      dest[448 + pos] = -new_v4;
      dest[464 + pos] = -new_v3;
      dest[480 + pos] = -new_v2;
      dest[496 + pos] = -new_v1;

      // insert V[32] (== -new_v[0]) into other v:
      dest = (actual_v==v1) ? v2 : v1;
      
      dest[0 + pos] = -new_v0;
      // insert V[33-48] (== new_v[16-31]) into other v:
      dest[16 + pos] = new_v16;
      dest[32 + pos] = new_v17;
      dest[48 + pos] = new_v18;
      dest[64 + pos] = new_v19;
      dest[80 + pos] = new_v20;
      dest[96 + pos] = new_v21;
      dest[112 + pos] = new_v22;
      dest[128 + pos] = new_v23;
      dest[144 + pos] = new_v24;
      dest[160 + pos] = new_v25;
      dest[176 + pos] = new_v26;
      dest[192 + pos] = new_v27;
      dest[208 + pos] = new_v28;
      dest[224 + pos] = new_v29;
      dest[240 + pos] = new_v30;
      dest[256 + pos] = new_v31;
      
      // insert V[49-63] (== new_v[30-16]) into other v:
      dest[272 + pos] = new_v30;
      dest[288 + pos] = new_v29;
      dest[304 + pos] = new_v28;
      dest[320 + pos] = new_v27;
      dest[336 + pos] = new_v26;
      dest[352 + pos] = new_v25;
      dest[368 + pos] = new_v24;
      dest[384 + pos] = new_v23;
      dest[400 + pos] = new_v22;
      dest[416 + pos] = new_v21;
      dest[432 + pos] = new_v20;
      dest[448 + pos] = new_v19;
      dest[464 + pos] = new_v18;
      dest[480 + pos] = new_v17;
      dest[496 + pos] = new_v16;                
/*
      }
      else
      {
            v1[0 + actual_write_pos] = -new_v0;
            // insert V[33-48] (== new_v[16-31]) into other v:
            v1[16 + actual_write_pos] = new_v16;
            v1[32 + actual_write_pos] = new_v17;
            v1[48 + actual_write_pos] = new_v18;
            v1[64 + actual_write_pos] = new_v19;
            v1[80 + actual_write_pos] = new_v20;
            v1[96 + actual_write_pos] = new_v21;
            v1[112 + actual_write_pos] = new_v22;
            v1[128 + actual_write_pos] = new_v23;
            v1[144 + actual_write_pos] = new_v24;
            v1[160 + actual_write_pos] = new_v25;
            v1[176 + actual_write_pos] = new_v26;
            v1[192 + actual_write_pos] = new_v27;
            v1[208 + actual_write_pos] = new_v28;
            v1[224 + actual_write_pos] = new_v29;
            v1[240 + actual_write_pos] = new_v30;
            v1[256 + actual_write_pos] = new_v31;

            // insert V[49-63] (== new_v[30-16]) into other v:
            v1[272 + actual_write_pos] = new_v30;
            v1[288 + actual_write_pos] = new_v29;
            v1[304 + actual_write_pos] = new_v28;
            v1[320 + actual_write_pos] = new_v27;
            v1[336 + actual_write_pos] = new_v26;
            v1[352 + actual_write_pos] = new_v25;
            v1[368 + actual_write_pos] = new_v24;
            v1[384 + actual_write_pos] = new_v23;
            v1[400 + actual_write_pos] = new_v22;
            v1[416 + actual_write_pos] = new_v21;
            v1[432 + actual_write_pos] = new_v20;
            v1[448 + actual_write_pos] = new_v19;
            v1[464 + actual_write_pos] = new_v18;
            v1[480 + actual_write_pos] = new_v17;
            v1[496 + actual_write_pos] = new_v16;     
      }
*/    
  }
      
  /**
   * Compute new values via a fast cosine transform.
   */
00575   private void compute_new_v_old()
  {
      // p is fully initialized from x1
       //float[] p = _p;
       // pp is fully initialized from p
       //float[] pp = _pp; 
        
       //float[] new_v = _new_v;
        
      float[] new_v = new float[32]; // new V[0-15] and V[33-48] of Figure 3-A.2 in ISO DIS 11172-3
      float[] p = new float[16];
      float[] pp = new float[16];
        
        
       for (int i=31; i>=0; i--)
       {
             new_v[i] = 0.0f;
       }
       
//    float[] new_v = new float[32]; // new V[0-15] and V[33-48] of Figure 3-A.2 in ISO DIS 11172-3
//    float[] p = new float[16];
//    float[] pp = new float[16];

    float[] x1 = samples;
      
      p[0] = x1[0] + x1[31];
      p[1] = x1[1] + x1[30];
      p[2] = x1[2] + x1[29];
      p[3] = x1[3] + x1[28];
      p[4] = x1[4] + x1[27];
      p[5] = x1[5] + x1[26];
      p[6] = x1[6] + x1[25];
      p[7] = x1[7] + x1[24];
      p[8] = x1[8] + x1[23];
      p[9] = x1[9] + x1[22];
      p[10] = x1[10] + x1[21];
      p[11] = x1[11] + x1[20];
      p[12] = x1[12] + x1[19];
      p[13] = x1[13] + x1[18];
      p[14] = x1[14] + x1[17];
      p[15] = x1[15] + x1[16];
      
      pp[0] = p[0] + p[15];
      pp[1] = p[1] + p[14];
      pp[2] = p[2] + p[13];
      pp[3] = p[3] + p[12];
      pp[4] = p[4] + p[11];
      pp[5] = p[5] + p[10];
      pp[6] = p[6] + p[9];
      pp[7] = p[7] + p[8];
      pp[8] = (p[0] - p[15]) * cos1_32;
      pp[9] = (p[1] - p[14]) * cos3_32;
      pp[10] = (p[2] - p[13]) * cos5_32;
      pp[11] = (p[3] - p[12]) * cos7_32;
      pp[12] = (p[4] - p[11]) * cos9_32;
      pp[13] = (p[5] - p[10]) * cos11_32;
      pp[14] = (p[6] - p[9]) * cos13_32;
      pp[15] = (p[7] - p[8]) * cos15_32;

      p[0] = pp[0] + pp[7];
      p[1] = pp[1] + pp[6];
      p[2] = pp[2] + pp[5];
      p[3] = pp[3] + pp[4];
      p[4] = (pp[0] - pp[7]) * cos1_16;
      p[5] = (pp[1] - pp[6]) * cos3_16;
      p[6] = (pp[2] - pp[5]) * cos5_16;
      p[7] = (pp[3] - pp[4]) * cos7_16;
      p[8] = pp[8] + pp[15];
      p[9] = pp[9] + pp[14];
      p[10] = pp[10] + pp[13];
      p[11] = pp[11] + pp[12];
      p[12] = (pp[8] - pp[15]) * cos1_16;
      p[13] = (pp[9] - pp[14]) * cos3_16;
      p[14] = (pp[10] - pp[13]) * cos5_16;
      p[15] = (pp[11] - pp[12]) * cos7_16;
      

      pp[0] = p[0] + p[3];
      pp[1] = p[1] + p[2];
      pp[2] = (p[0] - p[3]) * cos1_8;
      pp[3] = (p[1] - p[2]) * cos3_8;
      pp[4] = p[4] + p[7];
      pp[5] = p[5] + p[6];
      pp[6] = (p[4] - p[7]) * cos1_8;
      pp[7] = (p[5] - p[6]) * cos3_8;
      pp[8] = p[8] + p[11];
      pp[9] = p[9] + p[10];
      pp[10] = (p[8] - p[11]) * cos1_8;
      pp[11] = (p[9] - p[10]) * cos3_8;
      pp[12] = p[12] + p[15];
      pp[13] = p[13] + p[14];
      pp[14] = (p[12] - p[15]) * cos1_8;
      pp[15] = (p[13] - p[14]) * cos3_8;

      p[0] = pp[0] + pp[1];
      p[1] = (pp[0] - pp[1]) * cos1_4;
      p[2] = pp[2] + pp[3];
      p[3] = (pp[2] - pp[3]) * cos1_4;
      p[4] = pp[4] + pp[5];
      p[5] = (pp[4] - pp[5]) * cos1_4;
      p[6] = pp[6] + pp[7];
      p[7] = (pp[6] - pp[7]) * cos1_4;
      p[8] = pp[8] + pp[9];
      p[9] = (pp[8] - pp[9]) * cos1_4;
      p[10] = pp[10] + pp[11];
      p[11] = (pp[10] - pp[11]) * cos1_4;
      p[12] = pp[12] + pp[13];
      p[13] = (pp[12] - pp[13]) * cos1_4;
      p[14] = pp[14] + pp[15];
      p[15] = (pp[14] - pp[15]) * cos1_4;

      // this is pretty insane coding
      float tmp1;
      new_v[36-17] = -(new_v[4] = (new_v[12] = p[7]) + p[5]) - p[6];
      new_v[44-17] = -p[6] - p[7] - p[4];
      new_v[6] = (new_v[10] = (new_v[14] = p[15]) + p[11]) + p[13];
      new_v[34-17] = -(new_v[2] = p[15] + p[13] + p[9]) - p[14];
      new_v[38-17] = (tmp1 = -p[14] - p[15] - p[10] - p[11]) - p[13];
      new_v[46-17] = -p[14] - p[15] - p[12] - p[8];
      new_v[42-17] = tmp1 - p[12];
      new_v[48-17] = -p[0];
      new_v[0] = p[1];
      new_v[40-17] = -(new_v[8] = p[3]) - p[2];
      
      p[0] = (x1[0] - x1[31]) * cos1_64;
      p[1] = (x1[1] - x1[30]) * cos3_64;
      p[2] = (x1[2] - x1[29]) * cos5_64;
      p[3] = (x1[3] - x1[28]) * cos7_64;
      p[4] = (x1[4] - x1[27]) * cos9_64;
      p[5] = (x1[5] - x1[26]) * cos11_64;
      p[6] = (x1[6] - x1[25]) * cos13_64;
      p[7] = (x1[7] - x1[24]) * cos15_64;
      p[8] = (x1[8] - x1[23]) * cos17_64;
      p[9] = (x1[9] - x1[22]) * cos19_64;
      p[10] = (x1[10] - x1[21]) * cos21_64;
      p[11] = (x1[11] - x1[20]) * cos23_64;
      p[12] = (x1[12] - x1[19]) * cos25_64;
      p[13] = (x1[13] - x1[18]) * cos27_64;
      p[14] = (x1[14] - x1[17]) * cos29_64;
      p[15] = (x1[15] - x1[16]) * cos31_64;

      
      pp[0] = p[0] + p[15];
      pp[1] = p[1] + p[14];
      pp[2] = p[2] + p[13];
      pp[3] = p[3] + p[12];
      pp[4] = p[4] + p[11];
      pp[5] = p[5] + p[10];
      pp[6] = p[6] + p[9];
      pp[7] = p[7] + p[8];
      pp[8] = (p[0] - p[15]) * cos1_32;
      pp[9] = (p[1] - p[14]) * cos3_32;
      pp[10] = (p[2] - p[13]) * cos5_32;
      pp[11] = (p[3] - p[12]) * cos7_32;
      pp[12] = (p[4] - p[11]) * cos9_32;
      pp[13] = (p[5] - p[10]) * cos11_32;
      pp[14] = (p[6] - p[9]) * cos13_32;
      pp[15] = (p[7] - p[8]) * cos15_32;
      

      p[0] = pp[0] + pp[7];
      p[1] = pp[1] + pp[6];
      p[2] = pp[2] + pp[5];
      p[3] = pp[3] + pp[4];
      p[4] = (pp[0] - pp[7]) * cos1_16;
      p[5] = (pp[1] - pp[6]) * cos3_16;
      p[6] = (pp[2] - pp[5]) * cos5_16;
      p[7] = (pp[3] - pp[4]) * cos7_16;
      p[8] = pp[8] + pp[15];
      p[9] = pp[9] + pp[14];
      p[10] = pp[10] + pp[13];
      p[11] = pp[11] + pp[12];
      p[12] = (pp[8] - pp[15]) * cos1_16;
      p[13] = (pp[9] - pp[14]) * cos3_16;
      p[14] = (pp[10] - pp[13]) * cos5_16;
      p[15] = (pp[11] - pp[12]) * cos7_16;


      pp[0] = p[0] + p[3];
      pp[1] = p[1] + p[2];
      pp[2] = (p[0] - p[3]) * cos1_8;
      pp[3] = (p[1] - p[2]) * cos3_8;
      pp[4] = p[4] + p[7];
      pp[5] = p[5] + p[6];
      pp[6] = (p[4] - p[7]) * cos1_8;
      pp[7] = (p[5] - p[6]) * cos3_8;
      pp[8] = p[8] + p[11];
      pp[9] = p[9] + p[10];
      pp[10] = (p[8] - p[11]) * cos1_8;
      pp[11] = (p[9] - p[10]) * cos3_8;
      pp[12] = p[12] + p[15];
      pp[13] = p[13] + p[14];
      pp[14] = (p[12] - p[15]) * cos1_8;
      pp[15] = (p[13] - p[14]) * cos3_8;

      
      p[0] = pp[0] + pp[1];
      p[1] = (pp[0] - pp[1]) * cos1_4;
      p[2] = pp[2] + pp[3];
      p[3] = (pp[2] - pp[3]) * cos1_4;
      p[4] = pp[4] + pp[5];
      p[5] = (pp[4] - pp[5]) * cos1_4;
      p[6] = pp[6] + pp[7];
      p[7] = (pp[6] - pp[7]) * cos1_4;
      p[8] = pp[8] + pp[9];
      p[9] = (pp[8] - pp[9]) * cos1_4;
      p[10] = pp[10] + pp[11];
      p[11] = (pp[10] - pp[11]) * cos1_4;
      p[12] = pp[12] + pp[13];
      p[13] = (pp[12] - pp[13]) * cos1_4;
      p[14] = pp[14] + pp[15];
      p[15] = (pp[14] - pp[15]) * cos1_4;
      

      // manually doing something that a compiler should handle sucks
      // coding like this is hard to read
      float tmp2;
      new_v[5] = (new_v[11] = (new_v[13] = (new_v[15] = p[15]) + p[7]) + p[11])
                                          + p[5] + p[13];
      new_v[7] = (new_v[9] = p[15] + p[11] + p[3]) + p[13];
      new_v[33-17] = -(new_v[1] = (tmp1 = p[13] + p[15] + p[9]) + p[1]) - p[14];
      new_v[35-17] = -(new_v[3] = tmp1 + p[5] + p[7]) - p[6] - p[14];

      new_v[39-17] = (tmp1 = -p[10] - p[11] - p[14] - p[15])
                                                      - p[13] - p[2] - p[3];
      new_v[37-17] = tmp1 - p[13] - p[5] - p[6] - p[7];
      new_v[41-17] = tmp1 - p[12] - p[2] - p[3];
      new_v[43-17] = tmp1 - p[12] - (tmp2 = p[4] + p[6] + p[7]);
      new_v[47-17] = (tmp1 = -p[8] - p[12] - p[14] - p[15]) - p[0];
      new_v[45-17] = tmp1 - tmp2;

      // insert V[0-15] (== new_v[0-15]) into actual v:
      x1 = new_v;
      // float[] x2 = actual_v + actual_write_pos;
      float[] dest = actual_v;
      
      dest[0 + actual_write_pos] = x1[0];
      dest[16 + actual_write_pos] = x1[1];
      dest[32 + actual_write_pos] = x1[2];
      dest[48 + actual_write_pos] = x1[3];
      dest[64 + actual_write_pos] = x1[4];
      dest[80 + actual_write_pos] = x1[5];
      dest[96 + actual_write_pos] = x1[6];
      dest[112 + actual_write_pos] = x1[7];
      dest[128 + actual_write_pos] = x1[8];
      dest[144 + actual_write_pos] = x1[9];
      dest[160 + actual_write_pos] = x1[10];
      dest[176 + actual_write_pos] = x1[11];
      dest[192 + actual_write_pos] = x1[12];
      dest[208 + actual_write_pos] = x1[13];
      dest[224 + actual_write_pos] = x1[14];
      dest[240 + actual_write_pos] = x1[15];

      // V[16] is always 0.0:
      dest[256 + actual_write_pos] = 0.0f;

      // insert V[17-31] (== -new_v[15-1]) into actual v:
      dest[272 + actual_write_pos] = -x1[15];
      dest[288 + actual_write_pos] = -x1[14];
      dest[304 + actual_write_pos] = -x1[13];
      dest[320 + actual_write_pos] = -x1[12];
      dest[336 + actual_write_pos] = -x1[11];
      dest[352 + actual_write_pos] = -x1[10];
      dest[368 + actual_write_pos] = -x1[9];
      dest[384 + actual_write_pos] = -x1[8];
      dest[400 + actual_write_pos] = -x1[7];
      dest[416 + actual_write_pos] = -x1[6];
      dest[432 + actual_write_pos] = -x1[5];
      dest[448 + actual_write_pos] = -x1[4];
      dest[464 + actual_write_pos] = -x1[3];
      dest[480 + actual_write_pos] = -x1[2];
      dest[496 + actual_write_pos] = -x1[1];

      // insert V[32] (== -new_v[0]) into other v:
      
  }

  /**
   * Compute PCM Samples.
   */
  
00856   private float[] _tmpOut = new float[32];
  
  
  private void compute_pcm_samples0(Obuffer buffer)
  {
      final float[] vp = actual_v;  
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
            float pcm_sample;
            final float[] dp = d16[i];
            pcm_sample = (float)(((vp[0 + dvp] * dp[0]) +
                  (vp[15 + dvp] * dp[1]) +
                  (vp[14 + dvp] * dp[2]) +
                  (vp[13 + dvp] * dp[3]) +
                  (vp[12 + dvp] * dp[4]) +
                  (vp[11 + dvp] * dp[5]) +
                  (vp[10 + dvp] * dp[6]) +
                  (vp[9 + dvp] * dp[7]) +
                  (vp[8 + dvp] * dp[8]) +
                  (vp[7 + dvp] * dp[9]) +
                  (vp[6 + dvp] * dp[10]) +
                  (vp[5 + dvp] * dp[11]) +
                  (vp[4 + dvp] * dp[12]) +
                  (vp[3 + dvp] * dp[13]) +
                  (vp[2 + dvp] * dp[14]) +
                  (vp[1 + dvp] * dp[15])
                  ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
      } // for
  }
  
  private void compute_pcm_samples1(Obuffer buffer)
  {
      final float[] vp = actual_v;  
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[1 + dvp] * dp[0]) +
                              (vp[0 + dvp] * dp[1]) +
                              (vp[15 + dvp] * dp[2]) +
                              (vp[14 + dvp] * dp[3]) +
                              (vp[13 + dvp] * dp[4]) +
                              (vp[12 + dvp] * dp[5]) +
                              (vp[11 + dvp] * dp[6]) +
                              (vp[10 + dvp] * dp[7]) +
                              (vp[9 + dvp] * dp[8]) +
                              (vp[8 + dvp] * dp[9]) +
                              (vp[7 + dvp] * dp[10]) +
                              (vp[6 + dvp] * dp[11]) +
                              (vp[5 + dvp] * dp[12]) +
                              (vp[4 + dvp] * dp[13]) +
                              (vp[3 + dvp] * dp[14]) +
                              (vp[2 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
         } // for
  }
    private void compute_pcm_samples2(Obuffer buffer)
  {
      final float[] vp = actual_v;
      
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[2 + dvp] * dp[0]) +
                              (vp[1 + dvp] * dp[1]) +
                              (vp[0 + dvp] * dp[2]) +
                              (vp[15 + dvp] * dp[3]) +
                              (vp[14 + dvp] * dp[4]) +
                              (vp[13 + dvp] * dp[5]) +
                              (vp[12 + dvp] * dp[6]) +
                              (vp[11 + dvp] * dp[7]) +
                              (vp[10 + dvp] * dp[8]) +
                              (vp[9 + dvp] * dp[9]) +
                              (vp[8 + dvp] * dp[10]) +
                              (vp[7 + dvp] * dp[11]) +
                              (vp[6 + dvp] * dp[12]) +
                              (vp[5 + dvp] * dp[13]) +
                              (vp[4 + dvp] * dp[14]) +
                              (vp[3 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
      }
      
        private void compute_pcm_samples3(Obuffer buffer)
  {
      final float[] vp = actual_v;
      
      int idx = 0;
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[3 + dvp] * dp[0]) +
                              (vp[2 + dvp] * dp[1]) +
                              (vp[1 + dvp] * dp[2]) +
                              (vp[0 + dvp] * dp[3]) +
                              (vp[15 + dvp] * dp[4]) +
                              (vp[14 + dvp] * dp[5]) +
                              (vp[13 + dvp] * dp[6]) +
                              (vp[12 + dvp] * dp[7]) +
                              (vp[11 + dvp] * dp[8]) +
                              (vp[10 + dvp] * dp[9]) +
                              (vp[9 + dvp] * dp[10]) +
                              (vp[8 + dvp] * dp[11]) +
                              (vp[7 + dvp] * dp[12]) +
                              (vp[6 + dvp] * dp[13]) +
                              (vp[5 + dvp] * dp[14]) +
                              (vp[4 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
        }
                  
  private void compute_pcm_samples4(Obuffer buffer)
  {
      final float[] vp = actual_v;
      
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[4 + dvp] * dp[0]) +
                              (vp[3 + dvp] * dp[1]) +
                              (vp[2 + dvp] * dp[2]) +
                              (vp[1 + dvp] * dp[3]) +
                              (vp[0 + dvp] * dp[4]) +
                              (vp[15 + dvp] * dp[5]) +
                              (vp[14 + dvp] * dp[6]) +
                              (vp[13 + dvp] * dp[7]) +
                              (vp[12 + dvp] * dp[8]) +
                              (vp[11 + dvp] * dp[9]) +
                              (vp[10 + dvp] * dp[10]) +
                              (vp[9 + dvp] * dp[11]) +
                              (vp[8 + dvp] * dp[12]) +
                              (vp[7 + dvp] * dp[13]) +
                              (vp[6 + dvp] * dp[14]) +
                              (vp[5 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
  }
  
  private void compute_pcm_samples5(Obuffer buffer)
  {
      final float[] vp = actual_v;
      
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[5 + dvp] * dp[0]) +
                              (vp[4 + dvp] * dp[1]) +
                              (vp[3 + dvp] * dp[2]) +
                              (vp[2 + dvp] * dp[3]) +
                              (vp[1 + dvp] * dp[4]) +
                              (vp[0 + dvp] * dp[5]) +
                              (vp[15 + dvp] * dp[6]) +
                              (vp[14 + dvp] * dp[7]) +
                              (vp[13 + dvp] * dp[8]) +
                              (vp[12 + dvp] * dp[9]) +
                              (vp[11 + dvp] * dp[10]) +
                              (vp[10 + dvp] * dp[11]) +
                              (vp[9 + dvp] * dp[12]) +
                              (vp[8 + dvp] * dp[13]) +
                              (vp[7 + dvp] * dp[14]) +
                              (vp[6 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
  }
  
  private void compute_pcm_samples6(Obuffer buffer)
  {
      final float[] vp = actual_v;  
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[6 + dvp] * dp[0]) +
                              (vp[5 + dvp] * dp[1]) +
                              (vp[4 + dvp] * dp[2]) +
                              (vp[3 + dvp] * dp[3]) +
                              (vp[2 + dvp] * dp[4]) +
                              (vp[1 + dvp] * dp[5]) +
                              (vp[0 + dvp] * dp[6]) +
                              (vp[15 + dvp] * dp[7]) +
                              (vp[14 + dvp] * dp[8]) +
                              (vp[13 + dvp] * dp[9]) +
                              (vp[12 + dvp] * dp[10]) +
                              (vp[11 + dvp] * dp[11]) +
                              (vp[10 + dvp] * dp[12]) +
                              (vp[9 + dvp] * dp[13]) +
                              (vp[8 + dvp] * dp[14]) +
                              (vp[7 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
  }
  
    private void compute_pcm_samples7(Obuffer buffer)
  {
      final float[] vp = actual_v;
      
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[7 + dvp] * dp[0]) +
                              (vp[6 + dvp] * dp[1]) +
                              (vp[5 + dvp] * dp[2]) +
                              (vp[4 + dvp] * dp[3]) +
                              (vp[3 + dvp] * dp[4]) +
                              (vp[2 + dvp] * dp[5]) +
                              (vp[1 + dvp] * dp[6]) +
                              (vp[0 + dvp] * dp[7]) +
                              (vp[15 + dvp] * dp[8]) +
                              (vp[14 + dvp] * dp[9]) +
                              (vp[13 + dvp] * dp[10]) +
                              (vp[12 + dvp] * dp[11]) +
                              (vp[11 + dvp] * dp[12]) +
                              (vp[10 + dvp] * dp[13]) +
                              (vp[9 + dvp] * dp[14]) +
                              (vp[8 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
      }
  private void compute_pcm_samples8(Obuffer buffer)
  {
      final float[] vp = actual_v;
      
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[8 + dvp] * dp[0]) +
                              (vp[7 + dvp] * dp[1]) +
                              (vp[6 + dvp] * dp[2]) +
                              (vp[5 + dvp] * dp[3]) +
                              (vp[4 + dvp] * dp[4]) +
                              (vp[3 + dvp] * dp[5]) +
                              (vp[2 + dvp] * dp[6]) +
                              (vp[1 + dvp] * dp[7]) +
                              (vp[0 + dvp] * dp[8]) +
                              (vp[15 + dvp] * dp[9]) +
                              (vp[14 + dvp] * dp[10]) +
                              (vp[13 + dvp] * dp[11]) +
                              (vp[12 + dvp] * dp[12]) +
                              (vp[11 + dvp] * dp[13]) +
                              (vp[10 + dvp] * dp[14]) +
                              (vp[9 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
  }
  
  private void compute_pcm_samples9(Obuffer buffer)
  {
      final float[] vp = actual_v;
      
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[9 + dvp] * dp[0]) +
                              (vp[8 + dvp] * dp[1]) +
                              (vp[7 + dvp] * dp[2]) +
                              (vp[6 + dvp] * dp[3]) +
                              (vp[5 + dvp] * dp[4]) +
                              (vp[4 + dvp] * dp[5]) +
                              (vp[3 + dvp] * dp[6]) +
                              (vp[2 + dvp] * dp[7]) +
                              (vp[1 + dvp] * dp[8]) +
                              (vp[0 + dvp] * dp[9]) +
                              (vp[15 + dvp] * dp[10]) +
                              (vp[14 + dvp] * dp[11]) +
                              (vp[13 + dvp] * dp[12]) +
                              (vp[12 + dvp] * dp[13]) +
                              (vp[11 + dvp] * dp[14]) +
                              (vp[10 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
  }
  
  private void compute_pcm_samples10(Obuffer buffer)
  {
      final float[] vp = actual_v;  
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[10 + dvp] * dp[0]) +
                              (vp[9 + dvp] * dp[1]) +
                              (vp[8 + dvp] * dp[2]) +
                              (vp[7 + dvp] * dp[3]) +
                              (vp[6 + dvp] * dp[4]) +
                              (vp[5 + dvp] * dp[5]) +
                              (vp[4 + dvp] * dp[6]) +
                              (vp[3 + dvp] * dp[7]) +
                              (vp[2 + dvp] * dp[8]) +
                              (vp[1 + dvp] * dp[9]) +
                              (vp[0 + dvp] * dp[10]) +
                              (vp[15 + dvp] * dp[11]) +
                              (vp[14 + dvp] * dp[12]) +
                              (vp[13 + dvp] * dp[13]) +
                              (vp[12 + dvp] * dp[14]) +
                              (vp[11 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
  }
  private void compute_pcm_samples11(Obuffer buffer)
  {
      final float[] vp = actual_v;
      
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[11 + dvp] * dp[0]) +
                              (vp[10 + dvp] * dp[1]) +
                              (vp[9 + dvp] * dp[2]) +
                              (vp[8 + dvp] * dp[3]) +
                              (vp[7 + dvp] * dp[4]) +
                              (vp[6 + dvp] * dp[5]) +
                              (vp[5 + dvp] * dp[6]) +
                              (vp[4 + dvp] * dp[7]) +
                              (vp[3 + dvp] * dp[8]) +
                              (vp[2 + dvp] * dp[9]) +
                              (vp[1 + dvp] * dp[10]) +
                              (vp[0 + dvp] * dp[11]) +
                              (vp[15 + dvp] * dp[12]) +
                              (vp[14 + dvp] * dp[13]) +
                              (vp[13 + dvp] * dp[14]) +
                              (vp[12 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
  }
    private void compute_pcm_samples12(Obuffer buffer)
  {
      final float[] vp = actual_v;  
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                      final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[12 + dvp] * dp[0]) +
                              (vp[11 + dvp] * dp[1]) +
                              (vp[10 + dvp] * dp[2]) +
                              (vp[9 + dvp] * dp[3]) +
                              (vp[8 + dvp] * dp[4]) +
                              (vp[7 + dvp] * dp[5]) +
                              (vp[6 + dvp] * dp[6]) +
                              (vp[5 + dvp] * dp[7]) +
                              (vp[4 + dvp] * dp[8]) +
                              (vp[3 + dvp] * dp[9]) +
                              (vp[2 + dvp] * dp[10]) +
                              (vp[1 + dvp] * dp[11]) +
                              (vp[0 + dvp] * dp[12]) +
                              (vp[15 + dvp] * dp[13]) +
                              (vp[14 + dvp] * dp[14]) +
                              (vp[13 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
      }
  private void compute_pcm_samples13(Obuffer buffer)
  {
      final float[] vp = actual_v;
      
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[13 + dvp] * dp[0]) +
                              (vp[12 + dvp] * dp[1]) +
                              (vp[11 + dvp] * dp[2]) +
                              (vp[10 + dvp] * dp[3]) +
                              (vp[9 + dvp] * dp[4]) +
                              (vp[8 + dvp] * dp[5]) +
                              (vp[7 + dvp] * dp[6]) +
                              (vp[6 + dvp] * dp[7]) +
                              (vp[5 + dvp] * dp[8]) +
                              (vp[4 + dvp] * dp[9]) +
                              (vp[3 + dvp] * dp[10]) +
                              (vp[2 + dvp] * dp[11]) +
                              (vp[1 + dvp] * dp[12]) +
                              (vp[0 + dvp] * dp[13]) +
                              (vp[15 + dvp] * dp[14]) +
                              (vp[14 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
  }
  private void compute_pcm_samples14(Obuffer buffer)
  {
      final float[] vp = actual_v;
      
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        final float[] dp = d16[i];
                        float pcm_sample;

                        pcm_sample = (float)(((vp[14 + dvp] * dp[0]) +
                              (vp[13 + dvp] * dp[1]) +
                              (vp[12 + dvp] * dp[2]) +
                              (vp[11 + dvp] * dp[3]) +
                              (vp[10 + dvp] * dp[4]) +
                              (vp[9 + dvp] * dp[5]) +
                              (vp[8 + dvp] * dp[6]) +
                              (vp[7 + dvp] * dp[7]) +
                              (vp[6 + dvp] * dp[8]) +
                              (vp[5 + dvp] * dp[9]) +
                              (vp[4 + dvp] * dp[10]) +
                              (vp[3 + dvp] * dp[11]) +
                              (vp[2 + dvp] * dp[12]) +
                              (vp[1 + dvp] * dp[13]) +
                              (vp[0 + dvp] * dp[14]) +
                              (vp[15 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;
                  
                  dvp += 16;
                  } // for
  }
  private void compute_pcm_samples15(Obuffer buffer)
  {
      final float[] vp = actual_v;
            
      //int inc = v_inc;
      final float[] tmpOut = _tmpOut;
       int dvp =0;
      
                  // fat chance of having this loop unroll
                  for( int i=0; i<32; i++)
                  {
                        float pcm_sample;
                        final float dp[] = d16[i];
                        pcm_sample = (float)(((vp[15 + dvp] * dp[0]) +
                              (vp[14 + dvp] * dp[1]) +
                              (vp[13 + dvp] * dp[2]) +
                              (vp[12 + dvp] * dp[3]) +
                              (vp[11 + dvp] * dp[4]) +
                              (vp[10 + dvp] * dp[5]) +
                              (vp[9 + dvp] * dp[6]) +
                              (vp[8 + dvp] * dp[7]) +
                              (vp[7 + dvp] * dp[8]) +
                              (vp[6 + dvp] * dp[9]) +
                              (vp[5 + dvp] * dp[10]) +
                              (vp[4 + dvp] * dp[11]) +
                              (vp[3 + dvp] * dp[12]) +
                              (vp[2 + dvp] * dp[13]) +
                              (vp[1 + dvp] * dp[14]) +
                              (vp[0 + dvp] * dp[15])
                              ) * scalefactor);

            tmpOut[i] = pcm_sample;             
                  dvp += 16;
                  } // for
            }
                         
private void compute_pcm_samples(Obuffer buffer)
{
      
      switch (actual_write_pos)
      {
      case 0: 
            compute_pcm_samples0(buffer);
            break;
      case 1: 
            compute_pcm_samples1(buffer);
            break;
      case 2: 
            compute_pcm_samples2(buffer);
            break;
      case 3: 
            compute_pcm_samples3(buffer);
            break;
      case 4: 
            compute_pcm_samples4(buffer);
            break;
      case 5: 
            compute_pcm_samples5(buffer);
            break;
      case 6: 
            compute_pcm_samples6(buffer);
            break;
      case 7: 
            compute_pcm_samples7(buffer);
            break;
      case 8: 
            compute_pcm_samples8(buffer);
            break;
      case 9: 
            compute_pcm_samples9(buffer);
            break;
      case 10: 
            compute_pcm_samples10(buffer);
            break;
      case 11: 
            compute_pcm_samples11(buffer);
            break;
      case 12: 
            compute_pcm_samples12(buffer);
            break;
      case 13: 
            compute_pcm_samples13(buffer);
            break;
      case 14: 
            compute_pcm_samples14(buffer);
            break;
      case 15: 
            compute_pcm_samples15(buffer);
            break;
      }
            
      if (buffer!=null)
      {           
            buffer.appendSamples(channel, _tmpOut);
      }
       
/*
       // MDM: I was considering putting in quality control for
       // low-spec CPUs, but the performance gain (about 10-15%) 
       // did not justify the considerable drop in audio quality.
            switch (inc)
            {
            case 16:           
                buffer.appendSamples(channel, tmpOut);
                break;
            case 32:
                  for (int i=0; i<16; i++)
                  {
                        buffer.append(channel, (short)tmpOut[i]);
                        buffer.append(channel, (short)tmpOut[i]); 
                  }
                  break;                  
            case 64:
                  for (int i=0; i<8; i++)
                  {
                        buffer.append(channel, (short)tmpOut[i]);
                        buffer.append(channel, (short)tmpOut[i]);
                        buffer.append(channel, (short)tmpOut[i]);
                        buffer.append(channel, (short)tmpOut[i]); 
                  }
                  break;                  
      
            }
*/     
  }

  /**
   * Calculate 32 PCM samples and put the into the Obuffer-object.
   */
      
01547   public void calculate_pcm_samples(Obuffer buffer)
  {
      compute_new_v();  
      compute_pcm_samples(buffer);
    
      actual_write_pos = (actual_write_pos + 1) & 0xf;
      actual_v = (actual_v == v1) ? v2 : v1;

      // initialize samples[]:      
    //for (register float *floatp = samples + 32; floatp > samples; )
      // *--floatp = 0.0f;  
      
      // MDM: this may not be necessary. The Layer III decoder always
      // outputs 32 subband samples, but I haven't checked layer I & II.
      for (int p=0;p<32;p++) 
            samples[p] = 0.0f;
  }
  
  
  private static final double MY_PI = 3.14159265358979323846;
  private static final float cos1_64  =(float) (1.0 / (2.0 * Math.cos(MY_PI        / 64.0)));
  private static final float cos3_64  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 3.0  / 64.0)));
  private static final float cos5_64  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 5.0  / 64.0)));
  private static final float cos7_64  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 7.0  / 64.0)));
  private static final float cos9_64  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 9.0  / 64.0)));
  private static final float cos11_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 11.0 / 64.0)));
  private static final float cos13_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 13.0 / 64.0)));
  private static final float cos15_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 15.0 / 64.0)));
  private static final float cos17_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 17.0 / 64.0)));
  private static final float cos19_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 19.0 / 64.0)));
  private static final float cos21_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 21.0 / 64.0)));
  private static final float cos23_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 23.0 / 64.0)));
  private static final float cos25_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 25.0 / 64.0)));
  private static final float cos27_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 27.0 / 64.0)));
  private static final float cos29_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 29.0 / 64.0)));
  private static final float cos31_64 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 31.0 / 64.0)));
  private static final float cos1_32  =(float) (1.0 / (2.0 * Math.cos(MY_PI        / 32.0)));
  private static final float cos3_32  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 3.0  / 32.0)));
  private static final float cos5_32  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 5.0  / 32.0)));
  private static final float cos7_32  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 7.0  / 32.0)));
  private static final float cos9_32  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 9.0  / 32.0)));
  private static final float cos11_32 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 11.0 / 32.0)));
  private static final float cos13_32 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 13.0 / 32.0)));
  private static final float cos15_32 =(float) (1.0 / (2.0 * Math.cos(MY_PI * 15.0 / 32.0)));
  private static final float cos1_16  =(float) (1.0 / (2.0 * Math.cos(MY_PI        / 16.0)));
  private static final float cos3_16  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 3.0  / 16.0)));
  private static final float cos5_16  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 5.0  / 16.0)));
  private static final float cos7_16  =(float) (1.0 / (2.0 * Math.cos(MY_PI * 7.0  / 16.0)));
  private static final float cos1_8   =(float) (1.0 / (2.0 * Math.cos(MY_PI        / 8.0)));
  private static final float cos3_8   =(float) (1.0 / (2.0 * Math.cos(MY_PI * 3.0  / 8.0)));
  private static final float cos1_4   =(float) (1.0 / (2.0 * Math.cos(MY_PI / 4.0)));
  
  // Note: These values are not in the same order
  // as in Annex 3-B.3 of the ISO/IEC DIS 11172-3 
  // private float d[] = {0.000000000, -4.000442505};
  
  private static float d[] = null;
  
  /** 
   * d[] split into subarrays of length 16. This provides for
   * more faster access by allowing a block of 16 to be addressed
   * with constant offset. 
   **/
01610   private static float d16[][] = null;    
  
  /**
   * Loads the data for the d[] from the resource SFd.ser. 
   * @return the loaded values for d[].
   */
01616       static private float[] load_d()
      {
            try
            {
                  Class elemType = Float.TYPE;
                  Object o = JavaLayerUtils.deserializeArrayResource("sfd.ser", elemType, 512);
                  return (float[])o;
            }
            catch (IOException ex)
            {
                  throw new ExceptionInInitializerError(ex);
            }           
      }
      
      /**
       * Converts a 1D array into a number of smaller arrays. This is used
       * to achieve offset + constant indexing into an array. Each sub-array
       * represents a block of values of the original array. 
       * @param array               The array to split up into blocks.
       * @param blockSize           The size of the blocks to split the array
       *                                  into. This must be an exact divisor of
       *                                  the length of the array, or some data
       *                                  will be lost from the main array.
       * 
       * @return  An array of arrays in which each element in the returned
       *                array will be of length <code>blockSize</code>.
       */
01643       static private float[][] splitArray(final float[] array, final int blockSize)
      {
            int size = array.length / blockSize;
            float[][] split = new float[size][];
            for (int i=0; i<size; i++)
            {
                  split[i] = subArray(array, i*blockSize, blockSize);
            }
            return split;
      }
      
      /**
       * Returns a subarray of an existing array.
       * 
       * @param array   The array to retrieve a subarra from.
       * @param offs    The offset in the array that corresponds to
       *                      the first index of the subarray.
       * @param len     The number of indeces in the subarray.
       * @return The subarray, which may be of length 0.
       */
01663       static private float[] subArray(final float[] array, final int offs, int len)
      {
            if (offs+len > array.length)
            {
                  len = array.length-offs;
            }
            
            if (len < 0)
                  len = 0;
            
            float[] subarray = new float[len];
            for (int i=0; i<len; i++)
            {
                  subarray[i] = array[offs+i];
            }
            
            return subarray;
      }
      
      // The original data for d[]. This data is loaded from a file
      // to reduce the overall package size and to improve performance. 
/*  
  static final float d_data[] = {
      0.000000000f, -0.000442505f,  0.003250122f, -0.007003784f,
      0.031082153f, -0.078628540f,  0.100311279f, -0.572036743f,
      1.144989014f,  0.572036743f,  0.100311279f,  0.078628540f,
      0.031082153f,  0.007003784f,  0.003250122f,  0.000442505f,
   -0.000015259f, -0.000473022f,  0.003326416f, -0.007919312f,
      0.030517578f, -0.084182739f,  0.090927124f, -0.600219727f,
      1.144287109f,  0.543823242f,  0.108856201f,  0.073059082f,
      0.031478882f,  0.006118774f,  0.003173828f,  0.000396729f,
   -0.000015259f, -0.000534058f,  0.003387451f, -0.008865356f,
      0.029785156f, -0.089706421f,  0.080688477f, -0.628295898f,
      1.142211914f,  0.515609741f,  0.116577148f,  0.067520142f,
    0.031738281f,  0.005294800f,  0.003082275f,  0.000366211f,
   -0.000015259f, -0.000579834f,  0.003433228f, -0.009841919f,
    0.028884888f, -0.095169067f,  0.069595337f, -0.656219482f,
      1.138763428f,  0.487472534f,  0.123474121f,  0.061996460f,
    0.031845093f,  0.004486084f,  0.002990723f,  0.000320435f,
   -0.000015259f, -0.000625610f,  0.003463745f, -0.010848999f,
    0.027801514f, -0.100540161f,  0.057617188f, -0.683914185f,
      1.133926392f,  0.459472656f,  0.129577637f,  0.056533813f,
      0.031814575f,  0.003723145f,  0.002899170f,  0.000289917f,
   -0.000015259f, -0.000686646f,  0.003479004f, -0.011886597f,
      0.026535034f, -0.105819702f,  0.044784546f, -0.711318970f,
      1.127746582f,  0.431655884f,  0.134887695f,  0.051132202f,
      0.031661987f,  0.003005981f,  0.002792358f,  0.000259399f,
   -0.000015259f, -0.000747681f,  0.003479004f, -0.012939453f,
      0.025085449f, -0.110946655f,  0.031082153f, -0.738372803f,
    1.120223999f,  0.404083252f,  0.139450073f,  0.045837402f,
    0.031387329f,  0.002334595f,  0.002685547f,  0.000244141f,
   -0.000030518f, -0.000808716f,  0.003463745f, -0.014022827f,
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}

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