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-rw-r--r--tests/com/jsyn/examples/LongEcho.java123
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diff --git a/tests/com/jsyn/examples/LongEcho.java b/tests/com/jsyn/examples/LongEcho.java
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--- a/tests/com/jsyn/examples/LongEcho.java
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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();
- }
- }
-}