| /* |
| * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package com.sun.media.sound; |
| |
| /** |
| * A resampler that uses third-order (cubic) interpolation. |
| * |
| * @author Karl Helgason |
| */ |
| public final class SoftCubicResampler extends SoftAbstractResampler { |
| |
| public int getPadding() { |
| return 3; |
| } |
| |
| public void interpolate(float[] in, float[] in_offset, float in_end, |
| float[] startpitch, float pitchstep, float[] out, int[] out_offset, |
| int out_end) { |
| float pitch = startpitch[0]; |
| float ix = in_offset[0]; |
| int ox = out_offset[0]; |
| float ix_end = in_end; |
| int ox_end = out_end; |
| if (pitchstep == 0) { |
| while (ix < ix_end && ox < ox_end) { |
| int iix = (int) ix; |
| float fix = ix - iix; |
| float y0 = in[iix - 1]; |
| float y1 = in[iix]; |
| float y2 = in[iix + 1]; |
| float y3 = in[iix + 2]; |
| float a0 = y3 - y2 + y1 - y0; |
| float a1 = y0 - y1 - a0; |
| float a2 = y2 - y0; |
| float a3 = y1; |
| //float fix2 = fix * fix; |
| //out[ox++] = (a0 * fix + a1) * fix2 + (a2 * fix + a3); |
| out[ox++] = ((a0 * fix + a1) * fix + a2) * fix + a3; |
| ix += pitch; |
| } |
| } else { |
| while (ix < ix_end && ox < ox_end) { |
| int iix = (int) ix; |
| float fix = ix - iix; |
| float y0 = in[iix - 1]; |
| float y1 = in[iix]; |
| float y2 = in[iix + 1]; |
| float y3 = in[iix + 2]; |
| float a0 = y3 - y2 + y1 - y0; |
| float a1 = y0 - y1 - a0; |
| float a2 = y2 - y0; |
| float a3 = y1; |
| //float fix2 = fix * fix; |
| //out[ox++] = (a0 * fix + a1) * fix2 + (a2 * fix + a3); |
| out[ox++] = ((a0 * fix + a1) * fix + a2) * fix + a3; |
| ix += pitch; |
| pitch += pitchstep; |
| } |
| } |
| in_offset[0] = ix; |
| out_offset[0] = ox; |
| startpitch[0] = pitch; |
| |
| } |
| } |