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Q: setting audio devices (long)

Hi there,

I am writing a multi-track audio recording application in Javausing QTJava (OS X 10.2.3, Java 1.4.1 DP 9 installed, but I'm using 1.3.1 for QT to work) - until now with limited success. I have come across problems I cannot solve (this is only one of them...):

* how can I set the audio device with which to record from the application?

I have included a code fragment of a MyRecorder class that does nothing else but list and try to set the audio input drivers.

Here's an example:

Whenever I try to set a device corresponding to a driver, QT throws an exception although it lists the devices as present in the preceding code.
On my PowerBook, the "Built-in audio controller" has four devices, and the "iMic USB audio system" only one, as can be seen in the following printout:

--- 0 ----------
Input Driver : Built-in audio controller
Sound Input Parameters: 16, 2, 1918990112
Sound Input Rate : 44100.0
Input device[0] : External microphone/Line In
Input device[1] : Sound Input
Input device[2] : Zoomed Video
Input device[3] : Internal microphone
Selected device : 1, Sound Input
Channels avail, in use: 2, 2

--- 1 ----------
Input Driver : iMic USB audio system
Sound Input Parameters: 16, 2, 1918990112
Sound Input Rate : 44100.0
Input device[0] : iMic USB audio system
Selected device : 0, iMic USB audio system
Channels avail, in use: 2, 2

Now, if I try to change the device to e.g. "Internal microphone" using the setDevice() method with a device name, I get "BadSoundInDevice" and "badComponentInstance" exceptions. Using the setDevice() method with a driver name, e.g. "Built-in..." or "iMic..." does not cause an exception, but it also does not allow me to change my settings!

*** What am I doing wrong here? **********

Any help is greatly appreciated!

Christoph

---------- Here's the code (MyRecorder.java) --------------------------------------------------

import quicktime.*;
import quicktime.std.sg.*;
import quicktime.sound.*;
import quicktime.std.StdQTConstants;

public class MyRecorder implements StdQTConstants {

private SGSoundChannel audio;
private SequenceGrabber grabber;

private Grabber grab_1;
private Grabber grab_2;

MyRecorder(String driver0, String driver1) {
try {
QTSession.open();

grabber = new SequenceGrabber();

grab_1 = new Grabber (driver0, 0, grabber);
grab_2 = new Grabber (driver1, 1, grabber);

} catch (QTException e) {
System.out.println(e);
e.printStackTrace();
QTSession.close();
}
}

public static void main (String [] args) {
new MyRecorder(args[0], args[1]);
}
}


class Grabber implements StdQTConstants {

private SGSoundChannel mAudio;
private SequenceGrabber mGrabber;
private SPBDevice spbDevice;

private String driver;
private int devIndex;

public Grabber(String drv, int index, SequenceGrabber grab) {
mGrabber = grab;
driver = drv;
devIndex = index;
try {
createSGObject();
} catch (Exception ee){
ee.printStackTrace();
QTSession.close();
}
}

public void createSGObject() throws QTException {

mAudio = new SGSoundChannel (mGrabber);
mAudio.setUsage (seqGrabRecord);
mAudio.setInputDriver(driver);

spbDevice = mAudio.getInputDriver();
String [] inputSourceNames = spbDevice.getInputSourceNames();

System.out.println ("\n--- " + devIndex + " ----------");
System.out.println ("Input Driver : " + mAudio.getInputDriver().getName());
System.out.println ("Sound Input Parameters: " + mAudio.getSoundInputParameters().mSampleSize + ", " + mAudio.getSoundInputParameters().mNumChannels + ", " + mAudio.getSoundInputParameters().mCompressionType);
System.out.println ("Sound Input Rate : " + mAudio.getSoundInputRate());
for(int i = 0; i < inputSourceNames.length; i++) {
System.out.println("Input device[" + i + "] : " + inputSourceNames[i]);
}
System.out.println ("Selected device : " + (spbDevice.getInputSource() - 1) + ", " + inputSourceNames[spbDevice.getInputSource() - 1]);
System.out.println ("Channels avail, in use: " + spbDevice.getChannelAvailable() + ", " + spbDevice.getNumberChannels());

// does not work
//mAudio.setInputDriver(inputSourceNames[spbDevice.getInputSource() - 1]);
// works
//mAudio.setDevice(driver);
// does not work
mAudio.setDevice(inputSourceNames[spbDevice.getInputSource() - 1]);
}
}
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