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.BooleanControl.Type.MUTE;
21 import static javax.sound.sampled.FloatControl.Type.VOLUME;
23 import java.io.IOException;
24 import java.io.OutputStream;
25 import java.util.Arrays;
26 import java.util.List;
27 import java.util.logging.Logger;
28 import javax.sound.sampled.AudioFormat;
29 import javax.sound.sampled.AudioSystem;
30 import javax.sound.sampled.BooleanControl;
31 import javax.sound.sampled.Control;
32 import javax.sound.sampled.DataLine;
33 import javax.sound.sampled.FloatControl;
34 import javax.sound.sampled.LineUnavailableException;
35 import javax.sound.sampled.SourceDataLine;
37 import net.pterodactylus.sonitus.data.AbstractControlledComponent;
38 import net.pterodactylus.sonitus.data.Controller;
39 import net.pterodactylus.sonitus.data.Metadata;
40 import net.pterodactylus.sonitus.data.Sink;
41 import net.pterodactylus.sonitus.data.Source;
42 import net.pterodactylus.sonitus.data.controller.Fader;
43 import net.pterodactylus.sonitus.data.controller.Switch;
44 import net.pterodactylus.sonitus.data.event.MetadataUpdated;
45 import net.pterodactylus.sonitus.io.IntegralWriteOutputStream;
47 import com.google.common.base.Preconditions;
48 import com.google.common.eventbus.EventBus;
51 * {@link Sink} implementation that uses the JDK’s {@link AudioSystem} to play
52 * all {@link Source}s.
54 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
56 public class AudioSink extends AbstractControlledComponent implements Sink {
59 private static final Logger logger = Logger.getLogger(AudioSink.class.getName());
62 private final EventBus eventBus;
64 /** The volume fader. */
65 private final Fader volumeFader;
67 /** The “mute” switch. */
68 private final Switch muteSwitch;
70 /** The current metadata. */
71 private Metadata metadata;
73 /** The audio output. */
74 private SourceDataLine sourceDataLine;
76 /** A buffered output stream to ensure correct writing to the source data line. */
77 private OutputStream sourceDataLineOutputStream = new IntegralWriteOutputStream(new OutputStream() {
80 public void write(int b) throws IOException {
84 public void write(byte[] b) throws IOException {
85 write(b, 0, b.length);
89 public void write(byte[] b, int off, int len) throws IOException {
90 if (sourceDataLine != null) {
91 sourceDataLine.write(b, off, len);
97 * Creates a new audio sink.
102 public AudioSink(EventBus eventBus) {
103 this.eventBus = eventBus;
104 volumeFader = new Fader("Volume") {
107 protected void valueSet(Double value) {
108 /* search for preferred volume control. */
109 FloatControl volumeControl = getVolumeControl(sourceDataLine);
110 if (volumeControl == null) {
111 /* could not find volume control! */
115 volumeControl.setValue((float) (value * volumeControl.getMaximum()));
118 muteSwitch = new Switch("Mute") {
120 /** The previous value in case we have to emulate the mute control. */
121 private float previousValue;
124 protected void valueSet(Boolean value) {
125 /* search for mute control. */
126 BooleanControl muteControl = getMuteControl(sourceDataLine);
127 if (muteControl != null) {
128 muteControl.setValue(value);
132 /* could not find mute control, use volume control! */
133 FloatControl volumeControl = getVolumeControl(sourceDataLine);
134 if (volumeControl == null) {
135 /* no volume control, either? */
140 previousValue = volumeControl.getValue();
141 volumeControl.setValue(0);
143 volumeControl.setValue(previousValue);
151 // CONTROLLED METHODS
155 public String name() {
156 return "Audio Output";
160 public Metadata metadata() {
165 public List<Controller<?>> controllers() {
166 return Arrays.<Controller<?>>asList(volumeFader, muteSwitch);
174 public void open(Metadata metadata) throws IOException {
175 Preconditions.checkArgument(metadata.encoding().equalsIgnoreCase("PCM"), "source must be PCM-encoded");
176 AudioFormat audioFormat = new AudioFormat(metadata.frequency(), 16, metadata.channels(), true, false);
178 sourceDataLine = AudioSystem.getSourceDataLine(audioFormat);
179 sourceDataLine.open(audioFormat);
180 sourceDataLine.start();
181 metadataUpdated(metadata);
182 } catch (LineUnavailableException e) {
184 sourceDataLine = null;
185 throw new IOException(e);
190 public void close() {
191 sourceDataLine.stop();
192 sourceDataLine.close();
196 public void metadataUpdated(Metadata metadata) {
197 logger.info(String.format("Now playing %s.", metadata));
198 this.metadata = metadata;
199 fireMetadataUpdated(metadata);
200 eventBus.post(new MetadataUpdated(this, metadata));
204 public void process(byte[] buffer) throws IOException {
205 sourceDataLineOutputStream.write(buffer);
206 logger.finest(String.format("AudioSink: Wrote %d Bytes.", buffer.length));
214 * Returns the {@link FloatControl.Type.VOLUME} control.
217 * The data line to search for the control
218 * @return The control, or {@code null} if no volume control could be found
220 private static FloatControl getVolumeControl(DataLine dataLine) {
221 return getControl(dataLine, VOLUME, FloatControl.class);
225 * Returns the {@link BooleanControl.Type.MUTE} control.
228 * The data line to search for the control
229 * @return The control, or {@code null} if no mute control could be found
231 private static BooleanControl getMuteControl(DataLine dataLine) {
232 return getControl(dataLine, MUTE, BooleanControl.class);
236 * Searches the given data line for a control of the given type and returns it.
237 * If the given data line is {@code null}, {@code null} is returned.
240 * The data line to search for a control
242 * The type of the control to search
243 * @param controlClass
244 * The class of the control
246 * The class of the control
247 * @return The control, or {@code null} if no control could be found
249 private static <T> T getControl(DataLine dataLine, Control.Type controlType, Class<T> controlClass) {
250 if (dataLine == null) {
253 Control[] controls = dataLine.getControls();
254 for (Control control : controls) {
255 if (control.getType().equals(controlType)) {