/*
|
* 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));
|
}
|
