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/* 



Copyright (C) 2000 Andrew Sorensen & Andrew Brown

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or any
later version.

This program 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 for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

package jm.audio.synth;

import jm.audio.AOException;
import jm.audio.AudioObject;

/**
 * An Audio Object for granulation
 *
 * @author Timothy Opie
 * @version 1.0, Saturday, May 1, 2004
 */

public final class Grain2 extends AudioObject {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------

    private int grainSampSize = 1000; // Size of grains in samples
    private int spaceSamp = 1000; // space between grains in samples
    private int grainCount = 0;
    private int spaceCount = 0;
    private int offset = 0;
    private boolean grainOn = true; //To cheack whether a grain is on or not

    //----------------------------------------------
    // Constructors
    //----------------------------------------------
    public Grain2(AudioObject ao, int grainSampSize, int spaceSamp, boolean grainOn, int chan, int offset) {
        super(ao, "[Grain]");
        this.grainSampSize = grainSampSize * chan;
        this.spaceSamp = spaceSamp * chan;
        this.grainOn = grainOn;
        this.offset = offset;
    }


    /**
     * @param buffer The sample buffer.
     * @return The number of samples processed
     */
    public int work(float[] buffer) throws AOException {
        int returned = this.previous[0].nextWork(buffer);
        int tempoffset = offset;
        if (offset > 0) {
            for (int counter = 0; counter < offset; counter++) {
                buffer[counter] = 0;
            }
            offset = 0;
        }

        for (int counter = tempoffset; counter < returned; counter++) {
            if (grainOn) buffer[counter] = buffer[counter] *
                    (float) (Math.sin(Math.PI * grainCount / grainSampSize));
            if (grainOn && grainCount < grainSampSize) grainCount++;
            else if (grainOn) {
                grainOn = false;
                grainCount = 0;
            }

            if (!grainOn) buffer[counter] = 0;
            if (!grainOn && spaceCount < spaceSamp) spaceCount++;
            else if (!grainOn) {
                grainOn = true;
                spaceCount = 0;
            }
            //System.out.println(buffer[counter]);
        }

        return returned;
    }

    //Real-time calls

    // Set the Grain Duration
    public void setGrainDur(int gdur) {
        grainSampSize = gdur;
        System.out.println("Space4: " + grainSampSize);
    }

    // Set the Space Duration
    public void setSpaceDur(int sdur) {
        spaceSamp = sdur;
        System.out.println("Space4: " + spaceSamp);
    }
}