1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 //#define LOG_NDEBUG 0 18 19 #define LOG_TAG "AudioDeviceCallback-JNI" 20 21 #include <utils/Log.h> 22 #include <nativehelper/JNIHelp.h> 23 #include "core_jni_helpers.h" 24 #include <media/AudioSystem.h> 25 26 #include "android_media_DeviceCallback.h" 27 28 29 // ---------------------------------------------------------------------------- 30 31 using namespace android; 32 33 JNIDeviceCallback::JNIDeviceCallback(JNIEnv* env, jobject thiz, jobject weak_thiz, 34 jmethodID postEventFromNative) 35 { 36 37 // Hold onto the AudioTrack/AudioRecord class for use in calling the static method 38 // that posts events to the application thread. 39 jclass clazz = env->GetObjectClass(thiz); 40 if (clazz == NULL) { 41 return; 42 } 43 mClass = (jclass)env->NewGlobalRef(clazz); 44 45 // We use a weak reference so the AudioTrack/AudioRecord object can be garbage collected. 46 // The reference is only used as a proxy for callbacks. 47 mObject = env->NewGlobalRef(weak_thiz); 48 49 mPostEventFromNative = postEventFromNative; 50 } 51 52 JNIDeviceCallback::~JNIDeviceCallback() 53 { 54 // remove global references 55 JNIEnv *env = AndroidRuntime::getJNIEnv(); 56 if (env == NULL) { 57 return; 58 } 59 env->DeleteGlobalRef(mObject); 60 env->DeleteGlobalRef(mClass); 61 } 62 63 void JNIDeviceCallback::onAudioDeviceUpdate(audio_io_handle_t audioIo, 64 audio_port_handle_t deviceId) 65 { 66 JNIEnv *env = AndroidRuntime::getJNIEnv(); 67 if (env == NULL) { 68 return; 69 } 70 71 ALOGV("%s audioIo %d deviceId %d", __FUNCTION__, audioIo, deviceId); 72 env->CallStaticVoidMethod(mClass, 73 mPostEventFromNative, 74 mObject, 75 AUDIO_NATIVE_EVENT_ROUTING_CHANGE, deviceId, 0, NULL); 76 if (env->ExceptionCheck()) { 77 ALOGW("An exception occurred while notifying an event."); 78 env->ExceptionClear(); 79 } 80 } 81 82