Java example source code file (DirectAudioDeviceProvider.c)

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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;
}