2 * Sonitus - AudioSink.java - Copyright © 2013 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.sonitus.data.sink;
20 import static javax.sound.sampled.FloatControl.Type.VOLUME;
22 import java.io.IOException;
23 import java.io.OutputStream;
24 import java.util.Arrays;
25 import java.util.List;
26 import java.util.logging.Logger;
27 import javax.sound.sampled.AudioFormat;
28 import javax.sound.sampled.AudioSystem;
29 import javax.sound.sampled.FloatControl;
30 import javax.sound.sampled.LineUnavailableException;
31 import javax.sound.sampled.SourceDataLine;
33 import net.pterodactylus.sonitus.data.Controller;
34 import net.pterodactylus.sonitus.data.Metadata;
35 import net.pterodactylus.sonitus.data.Sink;
36 import net.pterodactylus.sonitus.data.Source;
37 import net.pterodactylus.sonitus.data.controller.Fader;
38 import net.pterodactylus.sonitus.data.controller.Switch;
39 import net.pterodactylus.sonitus.io.IntegralWriteOutputStream;
41 import com.google.common.base.Preconditions;
42 import com.google.common.eventbus.EventBus;
45 * {@link Sink} implementation that uses the JDK’s {@link AudioSystem} to play
46 * all {@link Source}s.
48 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
50 public class AudioSink implements Sink {
53 private static final Logger logger = Logger.getLogger(AudioSink.class.getName());
56 private final EventBus eventBus;
58 /** The volume fader. */
59 private final Fader volumeFader;
61 /** The “mute” switch. */
62 private final Switch muteSwitch;
64 /** The current metadata. */
65 private Metadata metadata;
67 /** The audio output. */
68 private SourceDataLine sourceDataLine;
70 /** A buffered output stream to ensure correct writing to the source data line. */
71 private OutputStream sourceDataLineOutputStream = new IntegralWriteOutputStream(new OutputStream() {
74 public void write(int b) throws IOException {
78 public void write(byte[] b) throws IOException {
79 write(b, 0, b.length);
83 public void write(byte[] b, int off, int len) throws IOException {
84 if (sourceDataLine != null) {
85 sourceDataLine.write(b, off, len);
91 * Creates a new audio sink.
96 public AudioSink(EventBus eventBus) {
97 this.eventBus = eventBus;
98 volumeFader = new Fader("Volume") {
101 protected void valueSet(Double value) {
102 if (sourceDataLine != null) {
103 FloatControl volumeControl = (FloatControl) sourceDataLine.getControl(VOLUME);
104 volumeControl.setValue((float) (value * volumeControl.getMaximum()));
108 muteSwitch = new Switch("Mute") {
110 private float previousValue;
113 protected void valueSet(Boolean value) {
114 if (sourceDataLine != null) {
115 FloatControl volumeControl = (FloatControl) sourceDataLine.getControl(VOLUME);
117 previousValue = volumeControl.getValue();
118 volumeControl.setValue(0);
120 volumeControl.setValue(previousValue);
128 // CONTROLLED METHODS
132 public String name() {
133 return "Audio Output";
137 public Metadata metadata() {
142 public List<Controller<?>> controllers() {
143 return Arrays.<Controller<?>>asList(volumeFader, muteSwitch);
151 public void open(Metadata metadata) throws IOException {
152 Preconditions.checkArgument(metadata.encoding().equalsIgnoreCase("PCM"), "source must be PCM-encoded");
153 AudioFormat audioFormat = new AudioFormat(metadata.frequency(), 16, metadata.channels(), true, false);
155 sourceDataLine = AudioSystem.getSourceDataLine(audioFormat);
156 sourceDataLine.open(audioFormat);
157 sourceDataLine.start();
158 } catch (LineUnavailableException e) {
160 throw new IOException(e);
165 public void close() {
166 sourceDataLine.stop();
167 sourceDataLine.close();
171 public void metadataUpdated(Metadata metadata) {
172 logger.info(String.format("Now playing %s.", metadata));
173 this.metadata = metadata;
177 public void process(byte[] buffer) throws IOException {
178 sourceDataLineOutputStream.write(buffer);
179 logger.finest(String.format("AudioSink: Wrote %d Bytes.", buffer.length));