我正在运行一个签名小程序，需要为用户提供选择输入和输出音频设备的能力（类似于skype提供的）。
我从其他thread借用了以下代码：
import javax.sound.sampled.*;
public class SoundAudit {
public static void main(String[] args) { try {
System.out.println("OS: "+System.getProperty("os.name")+" "+
System.getProperty("os.version")+"/"+
System.getProperty("os.arch")+"\nJava: "+
System.getProperty("java.version")+" ("+
System.getProperty("java.vendor")+")\n");
for (Mixer.Info thisMixerInfo : AudioSystem.getMixerInfo()) {
System.out.println("Mixer: "+thisMixerInfo.getDescription()+
" ["+thisMixerInfo.getName()+"]");
Mixer thisMixer = AudioSystem.getMixer(thisMixerInfo);
for (Line.Info thisLineInfo:thisMixer.getSourceLineInfo()) {
if (thisLineInfo.getLineClass().getName().equals(
"javax.sound.sampled.Port")) {
Line thisLine = thisMixer.getLine(thisLineInfo);
thisLine.open();
System.out.println(" Source Port: "
+thisLineInfo.toString());
for (Control thisControl : thisLine.getControls()) {
System.out.println(AnalyzeControl(thisControl));}
thisLine.close();}}
for (Line.Info thisLineInfo:thisMixer.getTargetLineInfo()) {
if (thisLineInfo.getLineClass().getName().equals(
"javax.sound.sampled.Port")) {
Line thisLine = thisMixer.getLine(thisLineInfo);
thisLine.open();
System.out.println(" Target Port: "
+thisLineInfo.toString());
for (Control thisControl : thisLine.getControls()) {
System.out.println(AnalyzeControl(thisControl));}
thisLine.close();}}}
} catch (Exception e) {e.printStackTrace();}}
public static String AnalyzeControl(Control thisControl) {
String type = thisControl.getType().toString();
if (thisControl instanceof BooleanControl) {
return " Control: "+type+" (boolean)"; }
if (thisControl instanceof CompoundControl) {
System.out.println(" Control: "+type+
" (compound - values below)");
String toReturn = "";
for (Control children:
((CompoundControl)thisControl).getMemberControls()) {
toReturn+=" "+AnalyzeControl(children)+"\n";}
return toReturn.substring(0, toReturn.length()-1);}
if (thisControl instanceof EnumControl) {
return " Control:"+type+" (enum: "+thisControl.toString()+")";}
if (thisControl instanceof FloatControl) {
return " Control: "+type+" (float: from "+
((FloatControl) thisControl).getMinimum()+" to "+
((FloatControl) thisControl).getMaximum()+")";}
return " Control: unknown type";}
}
但我得到的是：
Mixer: Software mixer and synthesizer [Java Sound Audio Engine]
Mixer: No details available [Microphone (Pink Front)]
我期待得到我的设备的真实列表（我的偏好面板显示3个输出设备和1个麦克风）。我在Mac OS X 10.6.7上运行。
还有其他方法可以从Java获取该信息吗？
答案 0 :(得分：4)
多年来，对于OS X的Java实现来说，这是一个非常不幸的限制，特别是对于那个平台而言是BTW，“Java Sound Audio Engine”是唯一可编程输出的音频线。因此，无论您发送到此行，即从您创建的任何Java应用程序中发送的内容，都将始终路由到已在OS X中设置为默认输出的内容，通常是内置扬声器。所以JSAE只是“默认音频输出”的Java术语。根据我们的理解 - 遗憾的是 - 最新版本仍然如此。
为什么不幸？因为它有效地禁用了甚至不起眼的音频路由。我们每天都在处理这些问题，并要求增加各种复杂性。有解决方法，但通过SoundFlower和HiJack Pro等第三方应用程序。例如www.soundPimp.com。
答案 1 :(得分：2)
也许你可以修改并使用它。以下代码用于选择我的两个Applet上的音频输出设备。我只对输出线感兴趣，而不是端口或输入线。第一部分列出了菜单栏下拉列表中选项组中的选项。第二部分根据所选选项设置混音器变量。
private void createMenuBars(){
JMenuBar menuBar = new JMenuBar();
menuBar.setBounds(0, 0, 60, 20);
JMenu optionMenu = new JMenu("Options");
JMenuItem pickMixers = new JMenuItem("Select a Playback Path");
optionMenu.add(pickMixers);
optionMenu.addSeparator();
ButtonGroup mixerSelections = new ButtonGroup();
addMixerOption("default sound system", mixerSelections, optionMenu, true);
AudioFormat audioFmt = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
44100, 16, 2, 4, 44100, false);
Mixer.Info[] mixers = AudioSystem.getMixerInfo();
for (Mixer.Info info : mixers)
{
Mixer mixer = AudioSystem.getMixer(info);
try
{
// System.out.println(info);
Info sdlLineInfo = new DataLine.Info(SourceDataLine.class, audioFmt);
// test if line is assignable
@SuppressWarnings("unused")
SourceDataLine sdl = (SourceDataLine) mixer.getLine(sdlLineInfo);
// if successful, add to list
addMixerOption(info.getName() + " <> " + info.getDescription(),
mixerSelections, optionMenu, false);
}
catch (LineUnavailableException e)
{
//e.printStackTrace();
System.out.println("Mixer rejected, Line Unavailable: " + info);
}
catch (IllegalArgumentException e)
{
//e.printStackTrace();
System.out.println("Mixer rejected, Illegal Argument: " + info);
}
}
menuBar.add(optionMenu);
add(menuBar,0);
}
private void addMixerOption(String optionName, ButtonGroup bg,
JMenu menu, boolean isSelected
{
JRadioButtonMenuItem newOption = new JRadioButtonMenuItem(optionName);
bg.add(newOption);
newOption.setSelected(isSelected);
menu.add(newOption);
newOption.addActionListener(new OptionListener());
newOption.setActionCommand(optionName);
}
选择一个选项时，混合变量会被设置。
public class OptionListener implements ActionListener
{
@Override
public void actionPerformed(ActionEvent arg0)
{
String optionName = arg0.getActionCommand();
Boolean defaultMixer = true;
Mixer.Info[] mixers = AudioSystem.getMixerInfo();
for (Mixer.Info info : mixers)
{
if (optionName.equals(info.getName()+" <> "+info.getDescription()))
{
System.out.println("Option selected > " + info.getName());
System.out.println(" description > " + info.getDescription());
System.out.println(" class > " + info.getClass());
appMixer = AudioSystem.getMixer(info);
System.out.println(appMixer);
defaultMixer = false;
}
}
if (defaultMixer)
{
System.out.println("Using default mixer, whatever that is...");
appMixer = null;
}
}
}
控制台消息过多。 我在http://hexara.com/VSL/JTheremin.htm
中使用它答案 2 :(得分：1)
这可能是JVM不支持在OS X上检索此信息，也可能不支持您的设备。我会做两件事：
我在linux上运行代码并且我正确地获得了所有细节：
OS: Linux 2.6.38-12-generic/amd64
Java: 1.6.0_22 (Sun Microsystems Inc.)
Mixer: the ear-candy mixer [PulseAudio Mixer]
Mixer: Direct Audio Device: default, default, default [default [default]]
Mixer: Direct Audio Device: HDA Intel, ALC662 rev1 Analog, ALC662 rev1 Analog [Intel [plughw:0,0]]
Mixer: Direct Audio Device: Plantronics Headset, USB Audio, USB Audio [Headset [plughw:1,0]]
Mixer: Direct Audio Device: USB Device 0x46d:0x8b2, USB Audio, USB Audio [U0x46d0x8b2 [plughw:2,0]]
Mixer: HDA Intel, Realtek ALC662 rev1 [Port Intel [hw:0]]
Source Port: Mic Boost source port
Control: Mic Boost (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Balance (float: from -1.0 to 1.0)
Source Port: Capture source port
Control: Capture (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Balance (float: from -1.0 to 1.0)
Control: Select (boolean)
Source Port: Capture source port
Control: Capture (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Balance (float: from -1.0 to 1.0)
Control: Select (boolean)
Target Port: Master target port
Control: Master (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Mute (boolean)
Target Port: Headphone target port
Control: Headphone (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Balance (float: from -1.0 to 1.0)
Control: Mute (boolean)
Target Port: Speaker target port
Control: Speaker (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Balance (float: from -1.0 to 1.0)
Control: Mute (boolean)
Target Port: PCM target port
Control: PCM (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Balance (float: from -1.0 to 1.0)
Control: Mute (boolean)
Target Port: Line target port
Control: Line (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Balance (float: from -1.0 to 1.0)
Control: Mute (boolean)
Target Port: Mic target port
Control: Mic (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Balance (float: from -1.0 to 1.0)
Control: Mute (boolean)
Target Port: Mic Boost target port
Control: Mic Boost (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Balance (float: from -1.0 to 1.0)
Mixer: Plantronics Headset, USB Mixer [Port Headset [hw:1]]
Source Port: Bass source port
Control: Bass (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Source Port: Treble source port
Control: Treble (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Source Port: Mic source port
Control: Mic (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Select (boolean)
Target Port: Bass target port
Control: Bass (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Target Port: Treble target port
Control: Treble (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Target Port: PCM target port
Control: PCM (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Balance (float: from -1.0 to 1.0)
Control: Mute (boolean)
Mixer: USB Device 0x46d:0x8b2, USB Mixer [Port U0x46d0x8b2 [hw:2]]
Source Port: Mic source port
Control: Mic (compound - values below)
Control: Volume (float: from 0.0 to 1.0)
Control: Select (boolean)