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.AbstractFilter;
38 import net.pterodactylus.sonitus.data.Controller;
39 import net.pterodactylus.sonitus.data.Filter;
40 import net.pterodactylus.sonitus.data.Metadata;
41 import net.pterodactylus.sonitus.data.controller.Fader;
42 import net.pterodactylus.sonitus.data.controller.Switch;
43 import net.pterodactylus.sonitus.io.IntegralWriteOutputStream;
45 import com.google.common.base.Preconditions;
48 * {@link Filter} implementation that uses the JDK’s {@link AudioSystem} to play
49 * all the audio signal.
51 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
53 public class AudioSink extends AbstractFilter {
56 private static final Logger logger = Logger.getLogger(AudioSink.class.getName());
58 /** The volume fader. */
59 private final Fader volumeFader;
61 /** The “mute” switch. */
62 private final Switch muteSwitch;
64 /** The audio output. */
65 private SourceDataLine sourceDataLine;
67 /** A buffered output stream to ensure correct writing to the source data line. */
68 private OutputStream sourceDataLineOutputStream = new IntegralWriteOutputStream(new OutputStream() {
71 public void write(int b) throws IOException {
75 public void write(byte[] b) throws IOException {
76 write(b, 0, b.length);
80 public void write(byte[] b, int off, int len) throws IOException {
81 if (sourceDataLine != null) {
82 sourceDataLine.write(b, off, len);
87 /** Creates a new audio sink. */
89 super("Audio Output");
90 volumeFader = new Fader("Volume") {
93 protected void valueSet(Double value) {
94 /* search for preferred volume control. */
95 FloatControl volumeControl = getVolumeControl(sourceDataLine);
96 if (volumeControl == null) {
97 /* could not find volume control! */
101 volumeControl.setValue((float) (value * volumeControl.getMaximum()));
104 muteSwitch = new Switch("Mute") {
106 /** The previous value in case we have to emulate the mute control. */
107 private float previousValue;
110 protected void valueSet(Boolean value) {
111 /* search for mute control. */
112 BooleanControl muteControl = getMuteControl(sourceDataLine);
113 if (muteControl != null) {
114 muteControl.setValue(value);
118 /* could not find mute control, use volume control! */
119 FloatControl volumeControl = getVolumeControl(sourceDataLine);
120 if (volumeControl == null) {
121 /* no volume control, either? */
126 previousValue = volumeControl.getValue();
127 volumeControl.setValue(0);
129 volumeControl.setValue(previousValue);
141 public List<Controller<?>> controllers() {
142 return Arrays.<Controller<?>>asList(volumeFader, muteSwitch);
146 public void open(Metadata metadata) throws IOException {
147 Preconditions.checkArgument(metadata.encoding().equalsIgnoreCase("PCM"), "source must be PCM-encoded");
148 super.open(metadata);
149 AudioFormat audioFormat = new AudioFormat(metadata.frequency(), 16, metadata.channels(), true, false);
151 sourceDataLine = AudioSystem.getSourceDataLine(audioFormat);
152 sourceDataLine.open(audioFormat);
153 sourceDataLine.start();
154 metadataUpdated(metadata);
155 } catch (LineUnavailableException e) {
157 sourceDataLine = null;
158 throw new IOException(e);
163 public void close() {
164 sourceDataLine.stop();
165 sourceDataLine.close();
169 public void metadataUpdated(Metadata metadata) {
170 super.metadataUpdated(metadata);
171 logger.fine(String.format("Now playing %s.", metadata));
175 public void process(byte[] buffer) throws IOException {
176 sourceDataLineOutputStream.write(buffer);
177 super.process(buffer);
178 logger.finest(String.format("AudioSink: Wrote %d Bytes.", buffer.length));
186 * Returns the {@link FloatControl.Type#VOLUME} control.
189 * The data line to search for the control
190 * @return The control, or {@code null} if no volume control could be found
192 private static FloatControl getVolumeControl(DataLine dataLine) {
193 return getControl(dataLine, VOLUME, FloatControl.class);
197 * Returns the {@link BooleanControl.Type#MUTE} control.
200 * The data line to search for the control
201 * @return The control, or {@code null} if no mute control could be found
203 private static BooleanControl getMuteControl(DataLine dataLine) {
204 return getControl(dataLine, MUTE, BooleanControl.class);
208 * Searches the given data line for a control of the given type and returns it.
209 * If the given data line is {@code null}, {@code null} is returned.
212 * The data line to search for a control
214 * The type of the control to search
215 * @param controlClass
216 * The class of the control
218 * The class of the control
219 * @return The control, or {@code null} if no control could be found
221 private static <T> T getControl(DataLine dataLine, Control.Type controlType, Class<T> controlClass) {
222 if (dataLine == null) {
225 Control[] controls = dataLine.getControls();
226 for (Control control : controls) {
227 if (control.getType().equals(controlType)) {