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/*
* Copyright 2009 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.unitgen;
import com.jsyn.data.FloatSample;
public class SampleGrainSource extends GrainCommon implements GrainSource {
private FloatSample sample;
private double position; // ranges from -1.0 to 1.0
private double positionRange;
private double phase; // ranges from 0.0 to 1.0
private double phaseIncrement;
private int numFramesGuarded;
private static final double MAX_PHASE = 0.9999999999;
@Override
public double next() {
phase += phaseIncrement;
if (phase > MAX_PHASE) {
phase = MAX_PHASE;
}
double fractionalIndex = phase * numFramesGuarded;
return sample.interpolate(fractionalIndex);
}
@Override
public void setRate(double rate) {
phaseIncrement = rate * sample.getFrameRate() / (getFrameRate() * numFramesGuarded);
}
public void setSample(FloatSample sample) {
this.sample = sample;
numFramesGuarded = sample.getNumFrames() - 1;
}
public void setPosition(double position) {
this.position = position;
}
@Override
public void reset() {
double randomPosition = position + (positionRange * (Math.random() - 0.5));
phase = (randomPosition * 0.5) + 0.5;
if (phase < 0.0) {
phase = 0.0;
} else if (phase > MAX_PHASE) {
phase = MAX_PHASE;
}
}
public void setPositionRange(double positionRange) {
this.positionRange = positionRange;
}
}
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