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Java example source code file (DirectAudioDeviceProvider.c)

This example Java source code file (DirectAudioDeviceProvider.c) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

directaudiodevicedescription, error0, java_com_sun_media_sound_directaudiodeviceprovider_ngetnumdevices, java_com_sun_media_sound_directaudiodeviceprovider_nnewdirectaudiodeviceinfo, jnicall, jniexport, null, null\\n, trace0, trace1, true, unknown, use_daudio, vendor

The DirectAudioDeviceProvider.c Java example source code

/*
 * Copyright (c) 2002, 2007, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

//#define USE_TRACE
//#define USE_ERROR


#include <jni.h>
#include "SoundDefs.h"
#include "DirectAudio.h"
#include "Utilities.h"
#include "com_sun_media_sound_DirectAudioDeviceProvider.h"


//////////////////////////////////////////// DirectAudioDeviceProvider ////////////////////////////////////////////

int getDirectAudioDeviceDescription(int mixerIndex, DirectAudioDeviceDescription* desc) {
    desc->deviceID = 0;
    desc->maxSimulLines = 0;
    strcpy(desc->name, "Unknown Name");
    strcpy(desc->vendor, "Unknown Vendor");
    strcpy(desc->description, "Unknown Description");
    strcpy(desc->version, "Unknown Version");
#if USE_DAUDIO == TRUE
    DAUDIO_GetDirectAudioDeviceDescription(mixerIndex, desc);
#endif // USE_DAUDIO
    return TRUE;
}

JNIEXPORT jint JNICALL Java_com_sun_media_sound_DirectAudioDeviceProvider_nGetNumDevices(JNIEnv *env, jclass cls) {
    INT32 numDevices = 0;

    TRACE0("Java_com_sun_media_sound_DirectAudioDeviceProvider_nGetNumDevices.\n");

#if USE_DAUDIO == TRUE
    numDevices = DAUDIO_GetDirectAudioDeviceCount();
#endif // USE_DAUDIO

    TRACE1("Java_com_sun_media_sound_DirectAudioDeviceProvider_nGetNumDevices returning %d.\n", (int) numDevices);

    return (jint)numDevices;
}

JNIEXPORT jobject JNICALL Java_com_sun_media_sound_DirectAudioDeviceProvider_nNewDirectAudioDeviceInfo
    (JNIEnv *env, jclass cls, jint mixerIndex) {

    jclass directAudioDeviceInfoClass;
    jmethodID directAudioDeviceInfoConstructor;
    DirectAudioDeviceDescription desc;
    jobject info = NULL;
    TRACE1("Java_com_sun_media_sound_DirectAudioDeviceProvider_nNewDirectAudioDeviceInfo(%d).\n", mixerIndex);

    // retrieve class and constructor of DirectAudioDeviceProvider.DirectAudioDeviceInfo
    directAudioDeviceInfoClass = (*env)->FindClass(env, IMPLEMENTATION_PACKAGE_NAME"/DirectAudioDeviceProvider$DirectAudioDeviceInfo");
    if (directAudioDeviceInfoClass == NULL) {
        ERROR0("Java_com_sun_media_sound_DirectAudioDeviceProvider_nNewDirectAudioDeviceInfo: directAudioDeviceInfoClass is NULL\n");
        return NULL;
    }
    directAudioDeviceInfoConstructor = (*env)->GetMethodID(env, directAudioDeviceInfoClass, "<init>",
                  "(IIILjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V");
    if (directAudioDeviceInfoConstructor == NULL) {
        ERROR0("Java_com_sun_media_sound_DirectAudioDeviceProvider_nNewDirectAudioDeviceInfo: directAudioDeviceInfoConstructor is NULL\n");
        return NULL;
    }

    TRACE1("Get description for device %d\n", mixerIndex);

    if (getDirectAudioDeviceDescription(mixerIndex, &desc)) {
        // create a new DirectAudioDeviceInfo object and return it
        info = (*env)->NewObject(env, directAudioDeviceInfoClass, directAudioDeviceInfoConstructor,
                                 mixerIndex,
                                 desc.deviceID,
                                 desc.maxSimulLines,
                                 (*env)->NewStringUTF(env, desc.name),
                                 (*env)->NewStringUTF(env, desc.vendor),
                                 (*env)->NewStringUTF(env, desc.description),
                                 (*env)->NewStringUTF(env, desc.version));
    } else {
        ERROR1("ERROR: getDirectAudioDeviceDescription(%d, desc) returned FALSE!\n", mixerIndex);
    }

    TRACE0("Java_com_sun_media_sound_DirectAudioDeviceProvider_nNewDirectAudioDeviceInfo succeeded.\n");
    return info;
}

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