| /* |
| * 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)); |
| } |
| |