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package com.sun.media.sound;

A resampler that uses first-order (linear) interpolation.
Author:
Karl Helgason/**
 * A resampler that uses first-order (linear) interpolation.
 *
 * @author Karl Helgason
 */
public final class SoftLinearResampler extends SoftAbstractResampler {

    @Override
    public int getPadding() {
        return 2;
    }

    @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 == 0f) {
            while (ix < ix_end && ox < ox_end) {
                int iix = (int) ix;
                float fix = ix - iix;
                float i = in[iix];
                out[ox++] = i + (in[iix + 1] - i) * fix;
                ix += pitch;
            }
        } else {
            while (ix < ix_end && ox < ox_end) {
                int iix = (int) ix;
                float fix = ix - iix;
                float i = in[iix];
                out[ox++] = i + (in[iix + 1] - i) * fix;
                ix += pitch;
                pitch += pitchstep;
            }
        }
        in_offset[0] = ix;
        out_offset[0] = ox;
        startpitch[0] = pitch;
    }
}