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package com.sun.media.sound;

import javax.sound.sampled.Mixer;
import javax.sound.sampled.spi.MixerProvider;

DirectAudioDevice provider.
Author:Florian Bomers
/** * DirectAudioDevice provider. * * @author Florian Bomers */
public final class DirectAudioDeviceProvider extends MixerProvider {
Set of info objects for all port input devices on the system.
/** * Set of info objects for all port input devices on the system. */
private static DirectAudioDeviceInfo[] infos;
Set of all port input devices on the system.
/** * Set of all port input devices on the system. */
private static DirectAudioDevice[] devices; static { // initialize Platform.initialize(); }
Required public no-arg constructor.
/** * Required public no-arg constructor. */
public DirectAudioDeviceProvider() { synchronized (DirectAudioDeviceProvider.class) { if (Platform.isDirectAudioEnabled()) { init(); } else { infos = new DirectAudioDeviceInfo[0]; devices = new DirectAudioDevice[0]; } } } private static void init() { // get the number of input devices int numDevices = nGetNumDevices(); if (infos == null || infos.length != numDevices) { // initialize the arrays infos = new DirectAudioDeviceInfo[numDevices]; devices = new DirectAudioDevice[numDevices]; // fill in the info objects now. for (int i = 0; i < infos.length; i++) { infos[i] = nNewDirectAudioDeviceInfo(i); } } } @Override public Mixer.Info[] getMixerInfo() { synchronized (DirectAudioDeviceProvider.class) { Mixer.Info[] localArray = new Mixer.Info[infos.length]; System.arraycopy(infos, 0, localArray, 0, infos.length); return localArray; } } @Override public Mixer getMixer(Mixer.Info info) { synchronized (DirectAudioDeviceProvider.class) { // if the default device is asked, we provide the mixer // with SourceDataLine's if (info == null) { for (int i = 0; i < infos.length; i++) { Mixer mixer = getDevice(infos[i]); if (mixer.getSourceLineInfo().length > 0) { return mixer; } } } // otherwise get the first mixer that matches // the requested info object for (int i = 0; i < infos.length; i++) { if (infos[i].equals(info)) { return getDevice(infos[i]); } } } throw new IllegalArgumentException( String.format("Mixer %s not supported by this provider", info)); } private static Mixer getDevice(DirectAudioDeviceInfo info) { int index = info.getIndex(); if (devices[index] == null) { devices[index] = new DirectAudioDevice(info); } return devices[index]; }
Info class for DirectAudioDevices. Adds an index value and a string for making native references to a particular device. This constructor is called from native.
/** * Info class for DirectAudioDevices. Adds an index value and a string for * making native references to a particular device. * This constructor is called from native. */
static final class DirectAudioDeviceInfo extends Mixer.Info { private final int index; private final int maxSimulLines; // For ALSA, the deviceID contains the encoded card index, device index, and sub-device-index private final int deviceID; private DirectAudioDeviceInfo(int index, int deviceID, int maxSimulLines, String name, String vendor, String description, String version) { super(name, vendor, "Direct Audio Device: "+description, version); this.index = index; this.maxSimulLines = maxSimulLines; this.deviceID = deviceID; } int getIndex() { return index; } int getMaxSimulLines() { return maxSimulLines; } int getDeviceID() { return deviceID; } } // class DirectAudioDeviceInfo private static native int nGetNumDevices(); // index: [0..nGetNumDevices()-1] private static native DirectAudioDeviceInfo nNewDirectAudioDeviceInfo(int deviceIndex); }