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.data.event.MetadataUpdated;
40 import net.pterodactylus.sonitus.io.IntegralWriteOutputStream;
42 import com.google.common.base.Preconditions;
43 import com.google.common.eventbus.EventBus;
46 * {@link Sink} implementation that uses the JDK’s {@link AudioSystem} to play
47 * all {@link Source}s.
49 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
51 public class AudioSink implements Sink {
54 private static final Logger logger = Logger.getLogger(AudioSink.class.getName());
57 private final EventBus eventBus;
59 /** The volume fader. */
60 private final Fader volumeFader;
62 /** The “mute” switch. */
63 private final Switch muteSwitch;
65 /** The current metadata. */
66 private Metadata metadata;
68 /** The audio output. */
69 private SourceDataLine sourceDataLine;
71 /** A buffered output stream to ensure correct writing to the source data line. */
72 private OutputStream sourceDataLineOutputStream = new IntegralWriteOutputStream(new OutputStream() {
75 public void write(int b) throws IOException {
79 public void write(byte[] b) throws IOException {
80 write(b, 0, b.length);
84 public void write(byte[] b, int off, int len) throws IOException {
85 if (sourceDataLine != null) {
86 sourceDataLine.write(b, off, len);
92 * Creates a new audio sink.
97 public AudioSink(EventBus eventBus) {
98 this.eventBus = eventBus;
99 volumeFader = new Fader("Volume") {
102 protected void valueSet(Double value) {
103 if (sourceDataLine != null) {
104 FloatControl volumeControl = (FloatControl) sourceDataLine.getControl(VOLUME);
105 volumeControl.setValue((float) (value * volumeControl.getMaximum()));
109 muteSwitch = new Switch("Mute") {
111 private float previousValue;
114 protected void valueSet(Boolean value) {
115 if (sourceDataLine != null) {
116 FloatControl volumeControl = (FloatControl) sourceDataLine.getControl(VOLUME);
118 previousValue = volumeControl.getValue();
119 volumeControl.setValue(0);
121 volumeControl.setValue(previousValue);
129 // CONTROLLED METHODS
133 public String name() {
134 return "Audio Output";
138 public Metadata metadata() {
143 public List<Controller<?>> controllers() {
144 return Arrays.<Controller<?>>asList(volumeFader, muteSwitch);
152 public void open(Metadata metadata) throws IOException {
153 Preconditions.checkArgument(metadata.encoding().equalsIgnoreCase("PCM"), "source must be PCM-encoded");
154 AudioFormat audioFormat = new AudioFormat(metadata.frequency(), 16, metadata.channels(), true, false);
156 sourceDataLine = AudioSystem.getSourceDataLine(audioFormat);
157 sourceDataLine.open(audioFormat);
158 sourceDataLine.start();
159 metadataUpdated(metadata);
160 } catch (LineUnavailableException e) {
162 throw new IOException(e);
167 public void close() {
168 sourceDataLine.stop();
169 sourceDataLine.close();
173 public void metadataUpdated(Metadata metadata) {
174 logger.info(String.format("Now playing %s.", metadata));
175 this.metadata = metadata;
176 eventBus.post(new MetadataUpdated(this, metadata));
180 public void process(byte[] buffer) throws IOException {
181 sourceDataLineOutputStream.write(buffer);
182 logger.finest(String.format("AudioSink: Wrote %d Bytes.", buffer.length));