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/*
* Copyright 2010 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.examples;
import java.io.File;
import java.io.IOException;
import com.jsyn.JSyn;
import com.jsyn.Synthesizer;
import com.jsyn.data.FloatSample;
import com.jsyn.devices.AudioDeviceManager;
import com.jsyn.unitgen.ChannelIn;
import com.jsyn.unitgen.ChannelOut;
import com.jsyn.unitgen.FixedRateMonoReader;
import com.jsyn.unitgen.FixedRateMonoWriter;
import com.jsyn.unitgen.Maximum;
import com.jsyn.unitgen.Minimum;
import com.jsyn.util.WaveFileWriter;
/**
* Echo the input using a circular buffer in a sample.
*
* @author Phil Burk (C) 2010 Mobileer Inc
*/
public class LongEcho {
final static int DELAY_SECONDS = 4;
Synthesizer synth;
ChannelIn channelIn;
ChannelOut channelOut;
FloatSample sample;
FixedRateMonoReader reader;
FixedRateMonoWriter writer;
Minimum minner;
Maximum maxxer;
private void test() throws IOException {
// Create a context for the synthesizer.
synth = JSyn.createSynthesizer();
synth.add(channelIn = new ChannelIn());
synth.add(channelOut = new ChannelOut());
synth.add(minner = new Minimum());
synth.add(maxxer = new Maximum());
synth.add(reader = new FixedRateMonoReader());
synth.add(writer = new FixedRateMonoWriter());
sample = new FloatSample(44100 * DELAY_SECONDS, 1);
maxxer.inputB.set(-0.98); // clip
minner.inputB.set(0.98);
// Connect the input to the output.
channelIn.output.connect(minner.inputA);
minner.output.connect(maxxer.inputA);
maxxer.output.connect(writer.input);
reader.output.connect(channelOut.input);
// Both stereo.
int numInputChannels = 2;
int numOutputChannels = 2;
synth.start(44100, AudioDeviceManager.USE_DEFAULT_DEVICE, numInputChannels,
AudioDeviceManager.USE_DEFAULT_DEVICE, numOutputChannels);
writer.start();
channelOut.start();
// For a long echo, read cursor should be just in front of the write cursor.
reader.dataQueue.queue(sample, 1000, sample.getNumFrames() - 1000);
// Loop both forever.
reader.dataQueue.queueLoop(sample, 0, sample.getNumFrames());
writer.dataQueue.queueLoop(sample, 0, sample.getNumFrames());
System.out.println("Start talking. You should hear an echo after " + DELAY_SECONDS
+ " seconds.");
// Sleep a while.
try {
double time = synth.getCurrentTime();
// Sleep for a while
synth.sleepUntil(time + 30.0);
} catch (InterruptedException e) {
e.printStackTrace();
}
saveEcho(new File("saved_echo.wav"));
// Stop everything.
synth.stop();
}
private void saveEcho(File file) throws IOException {
WaveFileWriter writer = new WaveFileWriter(file);
writer.setFrameRate(44100);
writer.setSamplesPerFrame(1);
writer.setBitsPerSample(16);
float[] buffer = new float[sample.getNumFrames()];
sample.read(buffer);
for (float v : buffer) {
writer.write(v);
}
writer.close();
}
public static void main(String[] args) {
try {
new LongEcho().test();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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