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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.ports.UnitOutputPort;
/**
* This reader can play any SequentialData and will interpolate between adjacent values. It can play
* both envelopes and samples.
*
* @author Phil Burk (C) 2009 Mobileer Inc
*/
public class VariableRateStereoReader extends VariableRateDataReader {
private double phase;
private double baseIncrement;
private double source0;
private double current0;
private double target0;
private double source1;
private double current1;
private double target1;
private boolean starved;
private boolean ranout;
public VariableRateStereoReader() {
dataQueue.setNumChannels(2);
addPort(output = new UnitOutputPort(2, "Output"));
starved = true;
baseIncrement = 1.0;
}
@Override
public void generate(int start, int limit) {
double[] amplitudes = amplitude.getValues();
double[] rates = rate.getValues();
double[] output0s = output.getValues(0);
double[] output1s = output.getValues(1);
for (int i = start; i < limit; i++) {
// Decrement phase and advance through queued data until phase back
// in range.
if (phase >= 1.0) {
while (phase >= 1.0) {
source0 = target0;
source1 = target1;
phase -= 1.0;
baseIncrement = advanceToNextFrame();
}
} else if ((i == 0) && (starved || !dataQueue.isTargetValid())) {
// A starved condition can only be cured at the beginning of a block.
source0 = target0 = current0;
source1 = target1 = current1;
phase = 0.0;
baseIncrement = advanceToNextFrame();
}
// Interpolate along line segment.
current0 = ((target0 - source0) * phase) + source0;
output0s[i] = current0 * amplitudes[i];
current1 = ((target1 - source1) * phase) + source1;
output1s[i] = current1 * amplitudes[i];
double phaseIncrement = baseIncrement * rates[i];
phase += limitPhaseIncrement(phaseIncrement);
}
if (ranout) {
ranout = false;
if (dataQueue.testAndClearAutoStop()) {
autoStop();
}
}
}
public double limitPhaseIncrement(double phaseIncrement) {
return phaseIncrement;
}
private double advanceToNextFrame() {
dataQueue.firePendingCallbacks();
if (dataQueue.hasMore()) {
starved = false;
dataQueue.beginFrame(getFramePeriod());
target0 = dataQueue.readCurrentChannelDouble(0);
target1 = dataQueue.readCurrentChannelDouble(1);
dataQueue.endFrame();
// calculate phase increment;
return synthesisEngine.getFramePeriod() * dataQueue.getNormalizedRate();
} else {
starved = true;
ranout = true;
phase = 0.0;
return 0.0;
}
}
}
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