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
17package com.android.server.telecom;
18
19import android.content.Context;
20import android.media.AudioDeviceCallback;
21import android.media.AudioDeviceInfo;
22import android.media.AudioManager;
23
24import com.android.internal.annotations.VisibleForTesting;
25import com.android.internal.util.IndentingPrintWriter;
26
27import java.util.Collections;
28import java.util.Set;
29import java.util.concurrent.ConcurrentHashMap;
30
31/** Listens for and caches headset state. */
32@VisibleForTesting
33public class WiredHeadsetManager {
34    @VisibleForTesting
35    public interface Listener {
36        void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn);
37    }
38
39    /** Receiver for wired headset plugged and unplugged events. */
40    private class WiredHeadsetCallback extends AudioDeviceCallback {
41        @Override
42        public void onAudioDevicesAdded(AudioDeviceInfo[] addedDevices) {
43            Log.startSession("WHC.oADA");
44            try {
45                updateHeadsetStatus();
46            } finally {
47                Log.endSession();
48            }
49        }
50
51        @Override
52        public void onAudioDevicesRemoved(AudioDeviceInfo[] devices) {
53            Log.startSession("WHC.oADR");
54            try {
55                updateHeadsetStatus();
56            } finally {
57                Log.endSession();
58            }
59        }
60
61        private void updateHeadsetStatus() {
62            AudioDeviceInfo[] devices = mAudioManager.getDevices(AudioManager.GET_DEVICES_ALL);
63            boolean isPluggedIn = false;
64            for (AudioDeviceInfo device : devices) {
65                switch (device.getType()) {
66                    case AudioDeviceInfo.TYPE_WIRED_HEADPHONES:
67                    case AudioDeviceInfo.TYPE_WIRED_HEADSET:
68                    case AudioDeviceInfo.TYPE_USB_DEVICE:
69                        isPluggedIn = true;
70                }
71            }
72
73            Log.i(WiredHeadsetManager.this, "ACTION_HEADSET_PLUG event, plugged in: %b, ",
74                    isPluggedIn);
75            onHeadsetPluggedInChanged(isPluggedIn);
76        }
77    }
78
79    private final AudioManager mAudioManager;
80    private boolean mIsPluggedIn;
81    /**
82     * ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is
83     * load factor before resizing, 1 means we only expect a single thread to
84     * access the map so make only a single shard
85     */
86    private final Set<Listener> mListeners = Collections.newSetFromMap(
87            new ConcurrentHashMap<>(8, 0.9f, 1));
88
89    public WiredHeadsetManager(Context context) {
90        mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
91        mIsPluggedIn = mAudioManager.isWiredHeadsetOn();
92
93        mAudioManager.registerAudioDeviceCallback(new WiredHeadsetCallback(), null);
94    }
95
96    @VisibleForTesting
97    public void addListener(Listener listener) {
98        mListeners.add(listener);
99    }
100
101    void removeListener(Listener listener) {
102        if (listener != null) {
103            mListeners.remove(listener);
104        }
105    }
106
107    @VisibleForTesting
108    public boolean isPluggedIn() {
109        return mIsPluggedIn;
110    }
111
112    private void onHeadsetPluggedInChanged(boolean isPluggedIn) {
113        if (mIsPluggedIn != isPluggedIn) {
114            Log.v(this, "onHeadsetPluggedInChanged, mIsPluggedIn: %b -> %b", mIsPluggedIn,
115                    isPluggedIn);
116            boolean oldIsPluggedIn = mIsPluggedIn;
117            mIsPluggedIn = isPluggedIn;
118            for (Listener listener : mListeners) {
119                listener.onWiredHeadsetPluggedInChanged(oldIsPluggedIn, mIsPluggedIn);
120            }
121        }
122    }
123
124    /**
125     * Dumps the state of the {@link WiredHeadsetManager}.
126     *
127     * @param pw The {@code IndentingPrintWriter} to write the state to.
128     */
129    public void dump(IndentingPrintWriter pw) {
130        pw.println("mIsPluggedIn: " + mIsPluggedIn);
131    }
132}
133