/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 */

/* @test

   @summary Test SoftPointResampler interpolate method */

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import javax.sound.sampled.*;

import com.sun.media.sound.*;

public class Interpolate {

    private static float getResamplerTestValue(double i)

    {

        return (float)Math.sin(i / 10.0);

    }

    private static void perfectInterpolation(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) {

                out[ox++] = getResamplerTestValue(ix);

                ix += pitch;

            }

        } else {

            while (ix < ix_end && ox < ox_end) {

                out[ox++] = getResamplerTestValue(ix);

                ix += pitch;

                pitch += pitchstep;

            }

        }

        in_offset[0] = ix;

        out_offset[0] = ox;

        startpitch[0] = pitch;

    }

    private static float testResampler(SoftAbstractResampler resampler, float p_pitch, float p_pitch2)

    {

        float[] testbuffer = new float[4096];

        float[] testbuffer2 = new float[1024];

        float[] testbuffer3 = new float[1024];

        for (int i = 0; i < testbuffer.length; i++)

            testbuffer[i] = getResamplerTestValue(i);

        int pads = resampler.getPadding();

        float pitchstep = (p_pitch2 - p_pitch)/1024f;

        int[] out_offset2 = {0};

        int[] out_offset3 = {0};

        resampler.interpolate(testbuffer, new float[] {pads}, testbuffer.length - pads, new float[] {p_pitch}, pitchstep, testbuffer2, out_offset2, testbuffer2.length);

        perfectInterpolation(new float[] {pads}, testbuffer.length - pads, new float[] {p_pitch}, pitchstep, testbuffer3, out_offset3, testbuffer3.length);

        int out_off = out_offset2[0];

        if(out_offset3[0] < out_off)

            out_off = out_offset3[0];

        float ac_error = 0;

        int counter = 0;

        for (int i = pads; i < out_off; i++) {

            ac_error += Math.abs(testbuffer2[i] - testbuffer3[i]);

            counter++;

        }

        return ac_error / ((float)counter);

    }

    private static void fail(String error) throws Exception

    {

        throw new RuntimeException(error);

    }

    public static void main(String[] args) throws Exception {

        SoftPointResampler resampler = new SoftPointResampler();

        float max = testResampler(resampler, 0.3f, 0.3f);

        if(max > 0.2)

            fail("Interpolation failed, error="+max);

        max = testResampler(resampler, 0.3f, 0.01f);

        if(max > 0.2)

            fail("Interpolation failed, error="+max);

        max = testResampler(resampler, 1.0f, 0.00f);

        if(max > 0.2)

            fail("Interpolation failed, error="+max);

    }