1 /* 2 * Copyright (c) 2007, 2013, 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 final 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 }