author | amenkov |
Mon, 28 Feb 2011 18:36:33 +0300 | |
changeset 8525 | 08f98f5a11df |
parent 5506 | 202f599c92aa |
child 18215 | b2afd66ce6db |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.media.sound; |
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|
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/** |
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* A resampler that uses third-order (cubic) interpolation. |
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* |
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* @author Karl Helgason |
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*/ |
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public class SoftCubicResampler extends SoftAbstractResampler { |
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|
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public int getPadding() { |
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return 3; |
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} |
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public void interpolate(float[] in, float[] in_offset, float in_end, |
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float[] startpitch, float pitchstep, float[] out, int[] out_offset, |
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int out_end) { |
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float pitch = startpitch[0]; |
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float ix = in_offset[0]; |
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int ox = out_offset[0]; |
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float ix_end = in_end; |
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int ox_end = out_end; |
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if (pitchstep == 0) { |
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while (ix < ix_end && ox < ox_end) { |
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int iix = (int) ix; |
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float fix = ix - iix; |
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float y0 = in[iix - 1]; |
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float y1 = in[iix]; |
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float y2 = in[iix + 1]; |
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float y3 = in[iix + 2]; |
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float a0 = y3 - y2 + y1 - y0; |
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float a1 = y0 - y1 - a0; |
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float a2 = y2 - y0; |
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float a3 = y1; |
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//float fix2 = fix * fix; |
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//out[ox++] = (a0 * fix + a1) * fix2 + (a2 * fix + a3); |
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out[ox++] = ((a0 * fix + a1) * fix + a2) * fix + a3; |
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ix += pitch; |
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} |
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} else { |
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while (ix < ix_end && ox < ox_end) { |
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int iix = (int) ix; |
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float fix = ix - iix; |
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float y0 = in[iix - 1]; |
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float y1 = in[iix]; |
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float y2 = in[iix + 1]; |
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float y3 = in[iix + 2]; |
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float a0 = y3 - y2 + y1 - y0; |
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float a1 = y0 - y1 - a0; |
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float a2 = y2 - y0; |
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float a3 = y1; |
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//float fix2 = fix * fix; |
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//out[ox++] = (a0 * fix + a1) * fix2 + (a2 * fix + a3); |
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out[ox++] = ((a0 * fix + a1) * fix + a2) * fix + a3; |
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ix += pitch; |
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pitch += pitchstep; |
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} |
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} |
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in_offset[0] = ix; |
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out_offset[0] = ox; |
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startpitch[0] = pitch; |
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} |
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} |