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      1 /*
      2  * Copyright (C) 2014 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 package android.media;
     18 
     19 import android.os.Handler;
     20 import android.os.Looper;
     21 import android.os.Message;
     22 import java.util.ArrayList;
     23 import java.lang.ref.WeakReference;
     24 
     25 /**
     26  * The AudioPortEventHandler handles AudioManager.OnAudioPortUpdateListener callbacks
     27  * posted from JNI
     28  * @hide
     29  */
     30 
     31 class AudioPortEventHandler {
     32     private Handler mHandler;
     33     private final ArrayList<AudioManager.OnAudioPortUpdateListener> mListeners =
     34             new ArrayList<AudioManager.OnAudioPortUpdateListener>();
     35 
     36     private static final String TAG = "AudioPortEventHandler";
     37 
     38     private static final int AUDIOPORT_EVENT_PORT_LIST_UPDATED = 1;
     39     private static final int AUDIOPORT_EVENT_PATCH_LIST_UPDATED = 2;
     40     private static final int AUDIOPORT_EVENT_SERVICE_DIED = 3;
     41     private static final int AUDIOPORT_EVENT_NEW_LISTENER = 4;
     42 
     43     /**
     44      * Accessed by native methods: JNI Callback context.
     45      */
     46     @SuppressWarnings("unused")
     47     private long mJniCallback;
     48 
     49     void init() {
     50         synchronized (this) {
     51             if (mHandler != null) {
     52                 return;
     53             }
     54             // find the looper for our new event handler
     55             Looper looper = Looper.getMainLooper();
     56 
     57             if (looper != null) {
     58                 mHandler = new Handler(looper) {
     59                     @Override
     60                     public void handleMessage(Message msg) {
     61                         ArrayList<AudioManager.OnAudioPortUpdateListener> listeners;
     62                         synchronized (this) {
     63                             if (msg.what == AUDIOPORT_EVENT_NEW_LISTENER) {
     64                                 listeners = new ArrayList<AudioManager.OnAudioPortUpdateListener>();
     65                                 if (mListeners.contains(msg.obj)) {
     66                                     listeners.add((AudioManager.OnAudioPortUpdateListener)msg.obj);
     67                                 }
     68                             } else {
     69                                 listeners = mListeners;
     70                             }
     71                         }
     72                         // reset audio port cache if the event corresponds to a change coming
     73                         // from audio policy service or if mediaserver process died.
     74                         if (msg.what == AUDIOPORT_EVENT_PORT_LIST_UPDATED ||
     75                                 msg.what == AUDIOPORT_EVENT_PATCH_LIST_UPDATED ||
     76                                 msg.what == AUDIOPORT_EVENT_SERVICE_DIED) {
     77                             AudioManager.resetAudioPortGeneration();
     78                         }
     79 
     80                         if (listeners.isEmpty()) {
     81                             return;
     82                         }
     83 
     84                         ArrayList<AudioPort> ports = new ArrayList<AudioPort>();
     85                         ArrayList<AudioPatch> patches = new ArrayList<AudioPatch>();
     86                         if (msg.what != AUDIOPORT_EVENT_SERVICE_DIED) {
     87                             int status = AudioManager.updateAudioPortCache(ports, patches, null);
     88                             if (status != AudioManager.SUCCESS) {
     89                                 return;
     90                             }
     91                         }
     92 
     93                         switch (msg.what) {
     94                         case AUDIOPORT_EVENT_NEW_LISTENER:
     95                         case AUDIOPORT_EVENT_PORT_LIST_UPDATED:
     96                             AudioPort[] portList = ports.toArray(new AudioPort[0]);
     97                             for (int i = 0; i < listeners.size(); i++) {
     98                                 listeners.get(i).onAudioPortListUpdate(portList);
     99                             }
    100                             if (msg.what == AUDIOPORT_EVENT_PORT_LIST_UPDATED) {
    101                                 break;
    102                             }
    103                             // FALL THROUGH
    104 
    105                         case AUDIOPORT_EVENT_PATCH_LIST_UPDATED:
    106                             AudioPatch[] patchList = patches.toArray(new AudioPatch[0]);
    107                             for (int i = 0; i < listeners.size(); i++) {
    108                                 listeners.get(i).onAudioPatchListUpdate(patchList);
    109                             }
    110                             break;
    111 
    112                         case AUDIOPORT_EVENT_SERVICE_DIED:
    113                             for (int i = 0; i < listeners.size(); i++) {
    114                                 listeners.get(i).onServiceDied();
    115                             }
    116                             break;
    117 
    118                         default:
    119                             break;
    120                         }
    121                     }
    122                 };
    123                 native_setup(new WeakReference<AudioPortEventHandler>(this));
    124             } else {
    125                 mHandler = null;
    126             }
    127         }
    128     }
    129 
    130     private native void native_setup(Object module_this);
    131 
    132     @Override
    133     protected void finalize() {
    134         native_finalize();
    135     }
    136     private native void native_finalize();
    137 
    138     void registerListener(AudioManager.OnAudioPortUpdateListener l) {
    139         synchronized (this) {
    140             mListeners.add(l);
    141         }
    142         if (mHandler != null) {
    143             Message m = mHandler.obtainMessage(AUDIOPORT_EVENT_NEW_LISTENER, 0, 0, l);
    144             mHandler.sendMessage(m);
    145         }
    146     }
    147 
    148     void unregisterListener(AudioManager.OnAudioPortUpdateListener l) {
    149         synchronized (this) {
    150             mListeners.remove(l);
    151         }
    152     }
    153 
    154     Handler handler() {
    155         return mHandler;
    156     }
    157 
    158     @SuppressWarnings("unused")
    159     private static void postEventFromNative(Object module_ref,
    160                                             int what, int arg1, int arg2, Object obj) {
    161         AudioPortEventHandler eventHandler =
    162                 (AudioPortEventHandler)((WeakReference)module_ref).get();
    163         if (eventHandler == null) {
    164             return;
    165         }
    166 
    167         if (eventHandler != null) {
    168             Handler handler = eventHandler.handler();
    169             if (handler != null) {
    170                 Message m = handler.obtainMessage(what, arg1, arg2, obj);
    171                 handler.sendMessage(m);
    172             }
    173         }
    174     }
    175 
    176 }
    177