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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "AudioVolumeGroupCallback-JNI"
#include <utils/Log.h>
#include <nativehelper/JNIHelp.h>
#include "core_jni_helpers.h"
#include "android_media_AudioVolumeGroupCallback.h"
// ----------------------------------------------------------------------------
using namespace android;
static const char* const kAudioVolumeGroupChangeHandlerClassPathName =
"android/media/audiopolicy/AudioVolumeGroupChangeHandler";
static struct {
jfieldID mJniCallback;
} gAudioVolumeGroupChangeHandlerFields;
static struct {
jmethodID postEventFromNative;
} gAudioVolumeGroupChangeHandlerMethods;
static Mutex gLock;
JNIAudioVolumeGroupCallback::JNIAudioVolumeGroupCallback(JNIEnv* env,
jobject thiz,
jobject weak_thiz)
{
jclass clazz = env->GetObjectClass(thiz);
if (clazz == NULL) {
ALOGE("Can't find class %s", kAudioVolumeGroupChangeHandlerClassPathName);
return;
}
mClass = (jclass)env->NewGlobalRef(clazz);
// We use a weak reference so the AudioVolumeGroupChangeHandler object can be garbage collected.
// The reference is only used as a proxy for callbacks.
mObject = env->NewGlobalRef(weak_thiz);
}
JNIAudioVolumeGroupCallback::~JNIAudioVolumeGroupCallback()
{
// remove global references
JNIEnv *env = AndroidRuntime::getJNIEnv();
if (env == NULL) {
return;
}
env->DeleteGlobalRef(mObject);
env->DeleteGlobalRef(mClass);
}
void JNIAudioVolumeGroupCallback::onAudioVolumeGroupChanged(volume_group_t group, int flags)
{
JNIEnv *env = AndroidRuntime::getJNIEnv();
if (env == NULL) {
return;
}
ALOGV("%s volume group id %d", __FUNCTION__, group);
env->CallStaticVoidMethod(mClass,
gAudioVolumeGroupChangeHandlerMethods.postEventFromNative,
mObject,
AUDIOVOLUMEGROUP_EVENT_VOLUME_CHANGED, group, flags, NULL);
if (env->ExceptionCheck()) {
ALOGW("An exception occurred while notifying an event.");
env->ExceptionClear();
}
}
void JNIAudioVolumeGroupCallback::onServiceDied()
{
JNIEnv *env = AndroidRuntime::getJNIEnv();
if (env == NULL) {
return;
}
env->CallStaticVoidMethod(mClass,
gAudioVolumeGroupChangeHandlerMethods.postEventFromNative,
mObject,
AUDIOVOLUMEGROUP_EVENT_SERVICE_DIED, 0, 0, NULL);
if (env->ExceptionCheck()) {
ALOGW("An exception occurred while notifying an event.");
env->ExceptionClear();
}
}
static
sp<JNIAudioVolumeGroupCallback> setJniCallback(JNIEnv* env,
jobject thiz,
const sp<JNIAudioVolumeGroupCallback>& callback)
{
Mutex::Autolock l(gLock);
sp<JNIAudioVolumeGroupCallback> old = (JNIAudioVolumeGroupCallback*)env->GetLongField(
thiz, gAudioVolumeGroupChangeHandlerFields.mJniCallback);
if (callback.get()) {
callback->incStrong((void*)setJniCallback);
}
if (old != 0) {
old->decStrong((void*)setJniCallback);
}
env->SetLongField(thiz, gAudioVolumeGroupChangeHandlerFields.mJniCallback,
(jlong)callback.get());
return old;
}
static void
android_media_AudioVolumeGroupChangeHandler_eventHandlerSetup(JNIEnv *env,
jobject thiz,
jobject weak_this)
{
ALOGV("%s", __FUNCTION__);
sp<JNIAudioVolumeGroupCallback> callback =
new JNIAudioVolumeGroupCallback(env, thiz, weak_this);
if (AudioSystem::addAudioVolumeGroupCallback(callback) == NO_ERROR) {
setJniCallback(env, thiz, callback);
}
}
static void
android_media_AudioVolumeGroupChangeHandler_eventHandlerFinalize(JNIEnv *env, jobject thiz)
{
ALOGV("%s", __FUNCTION__);
sp<JNIAudioVolumeGroupCallback> callback = setJniCallback(env, thiz, 0);
if (callback != 0) {
AudioSystem::removeAudioVolumeGroupCallback(callback);
}
}
/*
* JNI registration.
*/
static const JNINativeMethod gMethods[] = {
{"native_setup", "(Ljava/lang/Object;)V",
(void *)android_media_AudioVolumeGroupChangeHandler_eventHandlerSetup},
{"native_finalize", "()V",
(void *)android_media_AudioVolumeGroupChangeHandler_eventHandlerFinalize},
};
int register_android_media_AudioVolumeGroupChangeHandler(JNIEnv *env)
{
jclass audioVolumeGroupChangeHandlerClass =
FindClassOrDie(env, kAudioVolumeGroupChangeHandlerClassPathName);
gAudioVolumeGroupChangeHandlerMethods.postEventFromNative =
GetStaticMethodIDOrDie(env, audioVolumeGroupChangeHandlerClass, "postEventFromNative",
"(Ljava/lang/Object;IIILjava/lang/Object;)V");
gAudioVolumeGroupChangeHandlerFields.mJniCallback =
GetFieldIDOrDie(env, audioVolumeGroupChangeHandlerClass, "mJniCallback", "J");
env->DeleteLocalRef(audioVolumeGroupChangeHandlerClass);
return RegisterMethodsOrDie(env,
kAudioVolumeGroupChangeHandlerClassPathName,
gMethods,
NELEM(gMethods));
}
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