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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.util;
import com.jsyn.Synthesizer;
import com.jsyn.io.AudioFifo;
import com.jsyn.io.AudioInputStream;
import com.jsyn.ports.UnitInputPort;
import com.jsyn.unitgen.MonoStreamWriter;
import com.jsyn.unitgen.StereoStreamWriter;
import com.jsyn.unitgen.UnitStreamWriter;
/**
* Reads audio signals from the background engine to a foreground application through an AudioFifo.
* Connect to the input port returned by getInput().
*
* @author Phil Burk (C) 2010 Mobileer Inc
*/
public class AudioStreamReader implements AudioInputStream {
private UnitStreamWriter streamWriter;
private AudioFifo fifo;
public AudioStreamReader(Synthesizer synth, int samplesPerFrame) {
if (samplesPerFrame == 1) {
streamWriter = new MonoStreamWriter();
} else if (samplesPerFrame == 2) {
streamWriter = new StereoStreamWriter();
} else {
throw new IllegalArgumentException("Only 1 or 2 samplesPerFrame supported.");
}
synth.add(streamWriter);
fifo = new AudioFifo();
fifo.setWriteWaitEnabled(!synth.isRealTime());
fifo.setReadWaitEnabled(true);
fifo.allocate(32 * 1024);
streamWriter.setOutputStream(fifo);
streamWriter.start();
}
public UnitInputPort getInput() {
return streamWriter.input;
}
/** How many values are available to read without blocking? */
@Override
public int available() {
return fifo.available();
}
@Override
public void close() {
fifo.close();
}
@Override
public double read() {
return fifo.read();
}
@Override
public int read(double[] buffer) {
return fifo.read(buffer);
}
@Override
public int read(double[] buffer, int start, int count) {
return fifo.read(buffer, start, count);
}
}
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