get Audio Master Output Volume - Java javax.sound.sampled

Java examples for javax.sound.sampled:Audio

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Description

get Audio Master Output Volume

Demo Code

/*//from   ww  w .  ja  va 2s .c o m
 * Copyright 2011 Witoslaw Koczewsi <wi@koczewski.de>
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero
 * General Public License as published by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with this program. If not,
 * see <http://www.gnu.org/licenses/>.
 */
import java.util.ArrayList;
import java.util.List;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.BooleanControl;
import javax.sound.sampled.CompoundControl;
import javax.sound.sampled.Control;
import javax.sound.sampled.Control.Type;
import javax.sound.sampled.FloatControl;
import javax.sound.sampled.Line;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.Mixer;
import javax.sound.sampled.Mixer.Info;

public class Main{
    public static void main(String[] argv) throws Exception{
        System.out.println(getMasterOutputVolume());
    }
    public static Float getMasterOutputVolume() {
        Line line = getMasterOutputLine();
        if (line == null)
            return null;
        boolean opened = open(line);
        try {
            FloatControl control = getVolumeControl(line);
            if (control == null)
                return null;
            return control.getValue();
        } finally {
            if (opened)
                line.close();
        }
    }
    public static Line getMasterOutputLine() {
        for (Mixer mixer : getMixers()) {
            for (Line line : getAvailableOutputLines(mixer)) {
                if (line.getLineInfo().toString().contains("Master"))
                    return line;
            }
        }
        return null;
    }
    public static boolean open(Line line) {
        if (line.isOpen())
            return false;
        try {
            line.open();
        } catch (LineUnavailableException ex) {
            return false;
        }
        return true;
    }
    public static FloatControl getVolumeControl(Line line) {
        if (!line.isOpen())
            throw new RuntimeException("Line is closed: " + toString(line));
        return (FloatControl) findControl(FloatControl.Type.VOLUME,
                line.getControls());
    }
    public static List<Mixer> getMixers() {
        Info[] infos = AudioSystem.getMixerInfo();
        List<Mixer> mixers = new ArrayList<Mixer>(infos.length);
        for (Info info : infos) {
            Mixer mixer = AudioSystem.getMixer(info);
            mixers.add(mixer);
        }
        return mixers;
    }
    public static List<Line> getAvailableOutputLines(Mixer mixer) {
        return getAvailableLines(mixer, mixer.getTargetLineInfo());
    }
    public static String toString(Control control) {
        if (control == null)
            return null;
        return control.toString() + " (" + control.getType().toString()
                + ")";
    }
    public static String toString(Line line) {
        if (line == null)
            return null;
        Line.Info info = line.getLineInfo();
        return info.toString();// + " (" + line.getClass().getSimpleName() + ")";
    }
    public static String toString(Mixer mixer) {
        if (mixer == null)
            return null;
        StringBuilder sb = new StringBuilder();
        Info info = mixer.getMixerInfo();
        sb.append(info.getName());
        sb.append(" (").append(info.getDescription()).append(")");
        sb.append(mixer.isOpen() ? " [open]" : " [closed]");
        return sb.toString();
    }
    private static Control findControl(Type type, Control... controls) {
        if (controls == null || controls.length == 0)
            return null;
        for (Control control : controls) {
            if (control.getType().equals(type))
                return control;
            if (control instanceof CompoundControl) {
                CompoundControl compoundControl = (CompoundControl) control;
                Control member = findControl(type,
                        compoundControl.getMemberControls());
                if (member != null)
                    return member;
            }
        }
        return null;
    }
    private static List<Line> getAvailableLines(Mixer mixer,
            Line.Info[] lineInfos) {
        List<Line> lines = new ArrayList<Line>(lineInfos.length);
        for (Line.Info lineInfo : lineInfos) {
            Line line;
            line = getLineIfAvailable(mixer, lineInfo);
            if (line != null)
                lines.add(line);
        }
        return lines;
    }
}

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