Chapter 6: Processing Audio with Controls

Previous chapters have discussed how to play or capture audio samples. The implicit goal has been to deliver samples as faithfully as possible, without modification (other than possibly mixing the samples with those from other audio lines). Sometimes, however, you want to be able to modify the signal. The user might want it to sound louder, quieter, fuller, more reverberant, higher or lower in pitch, and so on. This chapter discusses the Java^TM Sound API features that provide these kinds of signal processing.

There are two ways to apply signal processing:

• You can use any processing supported by the mixer or its component lines, by querying for Control objects and then setting the controls as the user desires. Typical controls supported by mixers and lines include gain, pan, and reverberation controls.

• If the kind of processing you need isn't provided by the mixer or its lines, your program can operate directly on the audio bytes, manipulating them as desired.

Introduction to Controls

A mixer can have various sorts of signal-processing controls on some or all of its lines. For example, a mixer used for audio capture might have an input port with a gain control, and target data lines with gain and pan controls. A mixer used for audio playback might have sample-rate controls on its source data lines. In each case, the controls are all accessed through methods of the Line interface.

Because the Mixer interface extends Line, the mixer itself can have its own set of controls. These might serve as master controls affecting all the mixer's source or target lines. For example, the mixer might have a master gain control whose value in decibels is added to the values of individual gain controls on its target lines.

Others of the mixer's own controls might affect a special line, neither a source nor a target, that the mixer uses internally for its processing. For example, a global reverb control might choose the sort of reverberation to apply to a mixture of the input signals, and this "wet" (reverberated) signal would get mixed back into the "dry" signal before delivery to the mixer's target lines.

If the mixer or any of its lines have controls, you might wish to expose the controls via graphical objects in your program's user interface, so that the user can adjust the audio characteristics as desired. The controls are not themselves graphical; they just allow you to retrieve and change their settings. It's up to you to decide what sort of graphical representations (sliders, buttons, etc.), if any, to use in your program.

All controls are implemented as concrete subclasses of the abstract class Control. Many typical audio-processing controls can be described by abstract subclasses of Control based on a data type (such as boolean, enumerated, or float). Boolean controls, for example, represent binary-state controls, such as on/off controls for mute or reverb. Float controls, on the other hand, are well suited to represent continuously variable controls, such as pan, balance, or volume.

The Java Sound API specifies the following abstract subclasses of Control:

• BooleanControl—represents a binary-state (true or false) control. For example, mute, solo, and on/off switches would be good candidates for BooleanControls.

• FloatControl—data model providing control over a range of floating-point values. For example, volume and pan are FloatControls that could be manipulated via a dial or slider.

• EnumControl—offers a choice from a set of objects. For example, you might associate a set of buttons in the user interface with an EnumControl to select one of several preset reverberation settings.

• CompoundControl—provides access to a collection of related items, each of which is itself an instance of a Control subclass. CompoundControls represent multi-control modules such as graphic equalizers. (A graphic equalizer would typically be depicted by a set of sliders, each affecting a FloatControl.)

Of course, each class has methods that are particular to it and the data model represented by the class. For example, EnumControl has a method that lets you get the set of its possible values, and FloatControl permits you to get its minimum and maximum values, as well as the precision (increment or step size) of the control.

Each subclass of Control has a corresponding Control.Type subclass, which includes static instances that identify specific controls.

The following table shows each Control subclass, its corresponding Control.Type subclass, and the static instances that indicate specific kinds of controls:

Control	Control.Type	Control.Type instances
BooleanControl	BooleanControl.Type	MUTE Mute status of line APPLY_REVERB Reverberation on/off
CompoundControl	CompoundControl.Type	(none)
EnumControl	EnumControl.Type	REVERB Access to reverb settings (each is an instance of ReverbType)
FloatControl	FloatControl.Type	AUX_RETURN Auxiliary return gain on a line AUX_SEND Auxiliary send gain on a line BALANCE Left-right volume balance MASTER_GAIN Overall gain on a line PAN Left-right position REVERB_RETURN Post-reverb gain on a line REVERB_SEND Pre-reverb gain on a line SAMPLE_RATE Playback sample rate VOLUME Volume on a line

An implementation of the Java Sound API can provide any or all of these control types on its mixers and lines. It can also supply additional control types not defined in the Java Sound API. Such control types could be implemented via concrete subclasses of any of these four abstract subclasses, or via additional Control subclasses that don't inherit from any of these four abstract subclasses. An application program can query each line to find what controls it supports.

Getting a Line that Has the Desired Controls

In many cases, an application program will simply display whatever controls happen to be supported by the line in question. If the line doesn't have any controls, so be it. But what if it's important to find a line that has certain controls? In that case, you can use a Line.Info to obtain a line that has the right characteristics, as described under "Getting a Line of a Desired Type" in Chapter 3, "Accessing Audio System Resources."

For example, suppose you prefer an input port that lets the user set the volume of the sound input. The following code excerpt shows how one might query the default mixer to determine whether it has the desired port and control:

Port lineIn;
FloatControl volCtrl;
try {
  mixer = AudioSystem.getMixer(null);
  lineIn = (Port)mixer.getLine(Port.Info.LINE_IN);
  lineIn.open();
  volCtrl = (FloatControl) lineIn.getControl(

      FloatControl.Type.VOLUME);
  // Assuming getControl call succeeds, 
  // we now have our LINE_IN VOLUME control.
} catch (Exception e) {
  System.out.println("Failed trying to find LINE_IN"
    + " VOLUME control: exception = " + e);
}
if (volCtrl != null)
  // ...

Getting the Controls from the Line

An application program that needs to expose controls in its user interface might simply query the available lines and controls, and then display an appropriate user-interface element for every control on every line of interest. In such a case, the program's only mission is to provide the user with "handles" on the control; not to know what those controls do to the audio signal. As long as the program knows how to map a line's controls into user-interface elements, the Java Sound API architecture of Mixer, Line, and Control will generally take care of the rest.

For example, suppose your program plays back sound. You're using a SourceDataLine, which you've obtained as described under "Getting a Line of a Desired Type" in Chapter 3, "Accessing Audio System Resources." You can access the line's controls by invoking the Line method:

Control[] getControls()

Control.Type getType()

On the other hand, your program might distinguish between different types of controls—even those of the same class—and use a different user-interface element for each one. This would require you to test the instance returned by Control's getType method. Then if, for example, the type matched BooleanControl.Type.APPLY_REVERB, your program might display a checkbox; while if the type matched BooleanControl.Type.MUTE, you might instead display a toggle button.

Using a Control to Change the Audio Signal

Now that you know how to access a control and determine its type, this section will describe how to use Controls to change aspects of the audio signal. This section doesn't cover every available control; rather, it provides a few examples in this area to show you how to get started. These example include:

• Controlling a line's mute state
• Changing a line's volume
• Selecting among various reverberation presets

The following subsections describe some of the methods that must be invoked to affect the changes to specific controls.

Controlling a Line's Mute State

Controlling the mute state of any line is simply a matter of calling the following BooleanControl method:

void setValue(boolean value)

Changing a Line's Volume

Let's assume your program associates a particular graphic slider with a particular line's volume control. The value of a volume control (i.e., FloatControl.Type.VOLUME) is set using the following FloatControl method:

void setValue(float newValue)

Selecting among Various Reverberation Presets

Let's suppose that our program has a mixer with a line that has a control of type EnumControl.Type.REVERB. Calling the EnumControl method:

java.lang.Objects[] getValues() 

int getDecayTime() 
int getEarlyReflectionDelay() 
float getEarlyReflectionIntensity() 
int getLateReflectionDelay() 
float getLateReflectionIntensity() 

Typically, though, a program will create a user-interface element, for example, a radio button, for each of the ReverbType objects within the array returned by the getValues method. When the user clicks on one of these radio buttons, the program invokes the EnumControl method

void setValue(java.lang.Object value) 

So, from our application program's perspective, enabling a user to move from one reverberation preset (i.e., ReverbType) to another is simply a matter of connecting each element of the array returned by getValues to a distinct radio button.

Manipulating the Audio Data Directly

The Control API allows an implementation of the Java Sound API, or a third-party provider of a mixer, to supply arbitrary sorts of signal processing through controls. But what if no mixer offers the kind of signal processing you need? It will take more work, but you might be able to implement the signal processing in your program. Because the Java Sound API gives you access to the audio data as an array of bytes, you can alter these bytes in any way you choose.

If you're processing incoming sound, you can read the bytes from a TargetDataLine and then manipulate them. An algorithmically trivial example that can yield sonically intriguing results is to play a sound backwards by arranging its frames in reverse order. This trivial example may not be of much use for your program, but there are numerous sophisticated digital signal processing (DSP) techniques that might be more appropriate. Some examples are equalization, dynamic-range compression, peak limiting, and time stretching or compression, as well as special effects such as delay, chorus, flanging, distortion, and so on.

To play back processed sound, you can place your manipulated array of bytes into a SourceDataLine or Clip. Of course, the array of bytes need not be derived from an existing sound. You can synthesize sounds from scratch, although this requires some knowledge of acoustics or else access to sound-synthesis functions. For either processing or synthesis, you may want to consult an audio DSP textbook for the algorithms in which you're interested, or else import a third-party library of signal-processing functions into your program. For playback of synthesized sound, consider whether the Synthesizer API in the javax.sound.midi package meets your needs instead. (See Chapter 12, "Synthesizing Sound.")