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    1   /*
    2    * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   package com.sun.media.sound;
   26   
   27   /**
   28    * A resampler that uses third-order (cubic) interpolation.
   29    *
   30    * @author Karl Helgason
   31    */
   32   public class SoftCubicResampler extends SoftAbstractResampler {
   33   
   34       public int getPadding() {
   35           return 3;
   36       }
   37   
   38       public void interpolate(float[] in, float[] in_offset, float in_end,
   39               float[] startpitch, float pitchstep, float[] out, int[] out_offset,
   40               int out_end) {
   41           float pitch = startpitch[0];
   42           float ix = in_offset[0];
   43           int ox = out_offset[0];
   44           float ix_end = in_end;
   45           int ox_end = out_end;
   46           if (pitchstep == 0) {
   47               while (ix < ix_end && ox < ox_end) {
   48                   int iix = (int) ix;
   49                   float fix = ix - iix;
   50                   float y0 = in[iix - 1];
   51                   float y1 = in[iix];
   52                   float y2 = in[iix + 1];
   53                   float y3 = in[iix + 2];
   54                   float a0 = y3 - y2 + y1 - y0;
   55                   float a1 = y0 - y1 - a0;
   56                   float a2 = y2 - y0;
   57                   float a3 = y1;
   58                   //float fix2 = fix * fix;
   59                   //out[ox++] = (a0 * fix + a1) * fix2 + (a2 * fix + a3);
   60                   out[ox++] = ((a0 * fix + a1) * fix + a2) * fix + a3;
   61                   ix += pitch;
   62               }
   63           } else {
   64               while (ix < ix_end && ox < ox_end) {
   65                   int iix = (int) ix;
   66                   float fix = ix - iix;
   67                   float y0 = in[iix - 1];
   68                   float y1 = in[iix];
   69                   float y2 = in[iix + 1];
   70                   float y3 = in[iix + 2];
   71                   float a0 = y3 - y2 + y1 - y0;
   72                   float a1 = y0 - y1 - a0;
   73                   float a2 = y2 - y0;
   74                   float a3 = y1;
   75                   //float fix2 = fix * fix;
   76                   //out[ox++] = (a0 * fix + a1) * fix2 + (a2 * fix + a3);
   77                   out[ox++] = ((a0 * fix + a1) * fix + a2) * fix + a3;
   78                   ix += pitch;
   79                   pitch += pitchstep;
   80               }
   81           }
   82           in_offset[0] = ix;
   83           out_offset[0] = ox;
   84           startpitch[0] = pitch;
   85   
   86       }
   87   }

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