Jean-Michel Trivi | 24806db | 2015-10-01 15:00:59 -0700 | [diff] [blame] | 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 | package com.android.server.audio; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.media.AudioSystem; |
| 21 | import android.os.Handler; |
| 22 | import android.util.Log; |
| 23 | import android.view.OrientationEventListener; |
| 24 | import android.view.Surface; |
| 25 | import android.view.WindowManager; |
| 26 | |
| 27 | import com.android.server.policy.WindowOrientationListener; |
| 28 | |
| 29 | /** |
| 30 | * Class to handle device rotation events for AudioService, and forward device rotation |
| 31 | * to the audio HALs through AudioSystem. |
| 32 | * |
| 33 | * The role of this class is to monitor device orientation changes, and upon rotation, |
| 34 | * verify the UI orientation. In case of a change, send the new orientation, in increments |
| 35 | * of 90deg, through AudioSystem. |
| 36 | * |
| 37 | * Note that even though we're responding to device orientation events, we always |
| 38 | * query the display rotation so audio stays in sync with video/dialogs. This is |
| 39 | * done with .getDefaultDisplay().getRotation() from WINDOW_SERVICE. |
| 40 | */ |
| 41 | class RotationHelper { |
| 42 | |
| 43 | private static final String TAG = "AudioService.RotationHelper"; |
| 44 | |
| 45 | private static AudioOrientationListener sOrientationListener; |
| 46 | private static AudioWindowOrientationListener sWindowOrientationListener; |
| 47 | |
| 48 | private static final Object sRotationLock = new Object(); |
| 49 | private static int sDeviceRotation = Surface.ROTATION_0; // R/W synchronized on sRotationLock |
| 50 | |
| 51 | private static Context sContext; |
| 52 | |
| 53 | /** |
| 54 | * post conditions: |
| 55 | * - (sWindowOrientationListener != null) xor (sOrientationListener != null) |
| 56 | * - sWindowOrientationListener xor sOrientationListener is enabled |
| 57 | * - sContext != null |
| 58 | */ |
| 59 | static void init(Context context, Handler handler) { |
| 60 | if (context == null) { |
| 61 | throw new IllegalArgumentException("Invalid null context"); |
| 62 | } |
| 63 | sContext = context; |
| 64 | sWindowOrientationListener = new AudioWindowOrientationListener(context, handler); |
| 65 | sWindowOrientationListener.enable(); |
| 66 | if (!sWindowOrientationListener.canDetectOrientation()) { |
| 67 | // cannot use com.android.server.policy.WindowOrientationListener, revert to public |
| 68 | // orientation API |
| 69 | Log.i(TAG, "Not using WindowOrientationListener, reverting to OrientationListener"); |
| 70 | sWindowOrientationListener.disable(); |
| 71 | sWindowOrientationListener = null; |
| 72 | sOrientationListener = new AudioOrientationListener(context); |
| 73 | sOrientationListener.enable(); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | static void enable() { |
| 78 | if (sWindowOrientationListener != null) { |
| 79 | sWindowOrientationListener.enable(); |
| 80 | } else { |
| 81 | sOrientationListener.enable(); |
| 82 | } |
| 83 | updateOrientation(); |
| 84 | } |
| 85 | |
| 86 | static void disable() { |
| 87 | if (sWindowOrientationListener != null) { |
| 88 | sWindowOrientationListener.disable(); |
| 89 | } else { |
| 90 | sOrientationListener.disable(); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Query current display rotation and publish the change if any. |
| 96 | */ |
| 97 | static void updateOrientation() { |
| 98 | // Even though we're responding to device orientation events, |
| 99 | // use display rotation so audio stays in sync with video/dialogs |
| 100 | int newRotation = ((WindowManager) sContext.getSystemService( |
| 101 | Context.WINDOW_SERVICE)).getDefaultDisplay().getRotation(); |
| 102 | synchronized(sRotationLock) { |
| 103 | if (newRotation != sDeviceRotation) { |
| 104 | sDeviceRotation = newRotation; |
| 105 | publishRotation(sDeviceRotation); |
| 106 | } |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | private static void publishRotation(int rotation) { |
| 111 | Log.v(TAG, "publishing device rotation =" + rotation + " (x90deg)"); |
| 112 | switch (rotation) { |
| 113 | case Surface.ROTATION_0: |
| 114 | AudioSystem.setParameters("rotation=0"); |
| 115 | break; |
| 116 | case Surface.ROTATION_90: |
| 117 | AudioSystem.setParameters("rotation=90"); |
| 118 | break; |
| 119 | case Surface.ROTATION_180: |
| 120 | AudioSystem.setParameters("rotation=180"); |
| 121 | break; |
| 122 | case Surface.ROTATION_270: |
| 123 | AudioSystem.setParameters("rotation=270"); |
| 124 | break; |
| 125 | default: |
| 126 | Log.e(TAG, "Unknown device rotation"); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * Uses android.view.OrientationEventListener |
| 132 | */ |
| 133 | final static class AudioOrientationListener extends OrientationEventListener { |
| 134 | AudioOrientationListener(Context context) { |
| 135 | super(context); |
| 136 | } |
| 137 | |
| 138 | @Override |
| 139 | public void onOrientationChanged(int orientation) { |
| 140 | updateOrientation(); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Uses com.android.server.policy.WindowOrientationListener |
| 146 | */ |
| 147 | final static class AudioWindowOrientationListener extends WindowOrientationListener { |
| 148 | private static RotationCheckThread sRotationCheckThread; |
| 149 | |
| 150 | AudioWindowOrientationListener(Context context, Handler handler) { |
| 151 | super(context, handler); |
| 152 | } |
| 153 | |
| 154 | public void onProposedRotationChanged(int rotation) { |
| 155 | updateOrientation(); |
| 156 | if (sRotationCheckThread != null) { |
| 157 | sRotationCheckThread.endCheck(); |
| 158 | } |
| 159 | sRotationCheckThread = new RotationCheckThread(); |
| 160 | sRotationCheckThread.beginCheck(); |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * When com.android.server.policy.WindowOrientationListener report an orientation change, |
| 166 | * the UI may not have rotated yet. This thread polls with gradually increasing delays |
| 167 | * the new orientation. |
| 168 | */ |
| 169 | final static class RotationCheckThread extends Thread { |
| 170 | // how long to wait between each rotation check |
| 171 | private final int[] WAIT_TIMES_MS = { 10, 20, 50, 100, 100, 200, 200, 500 }; |
| 172 | private int mWaitCounter; |
| 173 | private final Object mCounterLock = new Object(); |
| 174 | |
| 175 | RotationCheckThread() { |
| 176 | super("RotationCheck"); |
| 177 | } |
| 178 | |
| 179 | void beginCheck() { |
| 180 | synchronized(mCounterLock) { |
| 181 | mWaitCounter = 0; |
| 182 | } |
| 183 | try { |
| 184 | start(); |
| 185 | } catch (IllegalStateException e) { } |
| 186 | } |
| 187 | |
| 188 | void endCheck() { |
| 189 | synchronized(mCounterLock) { |
| 190 | mWaitCounter = WAIT_TIMES_MS.length; |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | public void run() { |
Jean-Michel Trivi | 24806db | 2015-10-01 15:00:59 -0700 | [diff] [blame] | 195 | while (mWaitCounter < WAIT_TIMES_MS.length) { |
Jean-Michel Trivi | 24806db | 2015-10-01 15:00:59 -0700 | [diff] [blame] | 196 | int waitTimeMs; |
| 197 | synchronized(mCounterLock) { |
Jean-Michel Trivi | 0155856 | 2015-10-05 15:26:21 -0700 | [diff] [blame] | 198 | waitTimeMs = mWaitCounter < WAIT_TIMES_MS.length ? |
| 199 | WAIT_TIMES_MS[mWaitCounter] : 0; |
Jean-Michel Trivi | 24806db | 2015-10-01 15:00:59 -0700 | [diff] [blame] | 200 | mWaitCounter++; |
| 201 | } |
| 202 | try { |
Jean-Michel Trivi | 0155856 | 2015-10-05 15:26:21 -0700 | [diff] [blame] | 203 | if (waitTimeMs > 0) { |
| 204 | sleep(waitTimeMs); |
| 205 | updateOrientation(); |
| 206 | } |
Jean-Michel Trivi | 24806db | 2015-10-01 15:00:59 -0700 | [diff] [blame] | 207 | } catch (InterruptedException e) { } |
| 208 | } |
| 209 | } |
| 210 | } |
| 211 | } |