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package com.sun.media.sound;

A resampler that uses third-order (cubic) interpolation.
Author:Karl Helgason
/** * A resampler that uses third-order (cubic) interpolation. * * @author Karl Helgason */
public final class SoftCubicResampler extends SoftAbstractResampler { @Override public int getPadding() { return 3; } @Override 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; } }