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 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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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

 */

public final class DirectAudioDeviceProvider extends MixerProvider {

    // STATIC VARIABLES

    /**

     * 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.

     */

    private static DirectAudioDevice[] devices;

    // STATIC

    static {

        // initialize

        Platform.initialize();

    }

    // 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) {

            if (Printer.trace) Printer.trace("DirectAudioDeviceProvider: init()");

            // 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);

            }

            if (Printer.trace) Printer.trace("DirectAudioDeviceProvider: init(): found numDevices: " + numDevices);

        }

    }

    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;

        }

    }

    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("Mixer " + info.toString() + " not supported by this provider.");

    }

    private static Mixer getDevice(DirectAudioDeviceInfo info) {

        int index = info.getIndex();

        if (devices[index] == null) {

            devices[index] = new DirectAudioDevice(info);

        }

        return devices[index];

    }

    // INNER CLASSES

    /**

     * 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

    // NATIVE METHODS

    private static native int nGetNumDevices();

    // index: [0..nGetNumDevices()-1]

    private static native DirectAudioDeviceInfo nNewDirectAudioDeviceInfo(int deviceIndex);

}