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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 first-order (linear) interpolation.
   29    *
   30    * @author Karl Helgason
   31    */
   32   public class SoftLinearResampler extends SoftAbstractResampler {
   33   
   34       public int getPadding() {
   35           return 2;
   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   
   42           float pitch = startpitch[0];
   43           float ix = in_offset[0];
   44           int ox = out_offset[0];
   45           float ix_end = in_end;
   46           int ox_end = out_end;
   47           if (pitchstep == 0f) {
   48               while (ix < ix_end && ox < ox_end) {
   49                   int iix = (int) ix;
   50                   float fix = ix - iix;
   51                   float i = in[iix];
   52                   out[ox++] = i + (in[iix + 1] - i) * fix;
   53                   ix += pitch;
   54               }
   55           } else {
   56               while (ix < ix_end && ox < ox_end) {
   57                   int iix = (int) ix;
   58                   float fix = ix - iix;
   59                   float i = in[iix];
   60                   out[ox++] = i + (in[iix + 1] - i) * fix;
   61                   ix += pitch;
   62                   pitch += pitchstep;
   63               }
   64           }
   65           in_offset[0] = ix;
   66           out_offset[0] = ox;
   67           startpitch[0] = pitch;
   68   
   69       }
   70   }

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