src/main/java/net/pterodactylus/sonitus/data/sink/AudioSink.java

   1 /*
   2  * Sonitus - AudioSink.java - Copyright © 2013 David Roden
   3  *
   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.
   8  *
   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.
  13  *
  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/>.
  16  */
  17
  18 package net.pterodactylus.sonitus.data.sink;
  19
  20 import static javax.sound.sampled.FloatControl.Type.VOLUME;
  21
  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;
  32
  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;
  40
  41 import com.google.common.base.Preconditions;
  42
  43 /**
  44  * {@link Sink} implementation that uses the JDK’s {@link AudioSystem} to play
  45  * all {@link Source}s.
  46  *
  47  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  48  */
  49 public class AudioSink implements Sink {
  50
  51         /** The logger. */
  52         private static final Logger logger = Logger.getLogger(AudioSink.class.getName());
  53
  54         /** The volume fader. */
  55         private final Fader volumeFader;
  56
  57         /** The “mute” switch. */
  58         private final Switch muteSwitch;
  59
  60         /** The current metadata. */
  61         private Metadata metadata;
  62
  63         /** The audio output. */
  64         private SourceDataLine sourceDataLine;
  65
  66         /** A buffered output stream to ensure correct writing to the source data line. */
  67         private OutputStream sourceDataLineOutputStream = new IntegralWriteOutputStream(new OutputStream() {
  68
  69                 @Override
  70                 public void write(int b) throws IOException {
  71                 }
  72
  73                 @Override
  74                 public void write(byte[] b) throws IOException {
  75                         write(b, 0, b.length);
  76                 }
  77
  78                 @Override
  79                 public void write(byte[] b, int off, int len) throws IOException {
  80                         if (sourceDataLine != null) {
  81                                 sourceDataLine.write(b, off, len);
  82                         }
  83                 }
  84         }, 1024);
  85
  86         /** Creates a new audio sink. */
  87         public AudioSink() {
  88                 super();
  89                 volumeFader = new Fader("Volume") {
  90
  91                         @Override
  92                         protected void valueSet(Double value) {
  93                                 if (sourceDataLine != null) {
  94                                         FloatControl volumeControl = (FloatControl) sourceDataLine.getControl(VOLUME);
  95                                         volumeControl.setValue((float) (value * volumeControl.getMaximum()));
  96                                 }
  97                         }
  98                 };
  99                 muteSwitch = new Switch("Mute") {
 100
 101                         private float previousValue;
 102
 103                         @Override
 104                         protected void valueSet(Boolean value) {
 105                                 if (sourceDataLine != null) {
 106                                         FloatControl volumeControl = (FloatControl) sourceDataLine.getControl(VOLUME);
 107                                         if (value) {
 108                                                 previousValue = volumeControl.getValue();
 109                                                 volumeControl.setValue(0);
 110                                         } else {
 111                                                 volumeControl.setValue(previousValue);
 112                                         }
 113                                 }
 114                         }
 115                 };
 116         }
 117
 118         //
 119         // CONTROLLED METHODS
 120         //
 121
 122         @Override
 123         public List<Controller<?>> controllers() {
 124                 return Arrays.<Controller<?>>asList(volumeFader, muteSwitch);
 125         }
 126
 127         //
 128         // SINK METHODS
 129         //
 130
 131         @Override
 132         public void open(Metadata metadata) throws IOException {
 133                 Preconditions.checkArgument(metadata.encoding().equalsIgnoreCase("PCM"), "source must be PCM-encoded");
 134                 AudioFormat audioFormat = new AudioFormat(metadata.frequency(), 16, metadata.channels(), true, false);
 135                 try {
 136                         sourceDataLine = AudioSystem.getSourceDataLine(audioFormat);
 137                         sourceDataLine.open(audioFormat);
 138                         sourceDataLine.start();
 139                 } catch (LineUnavailableException e) {
 140                         /* TODO */
 141                         throw new IOException(e);
 142                 }
 143         }
 144
 145         @Override
 146         public void close() {
 147                 sourceDataLine.stop();
 148                 sourceDataLine.close();
 149         }
 150
 151         @Override
 152         public void metadataUpdated(Metadata metadata) {
 153                 logger.info(String.format("Now playing %s.", metadata));
 154         }
 155
 156         @Override
 157         public void process(byte[] buffer) throws IOException {
 158                 sourceDataLineOutputStream.write(buffer);
 159                 logger.finest(String.format("AudioSink: Wrote %d Bytes.", buffer.length));
 160         }
 161
 162 }