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 package com.android.bluetooth.a2dpsink; 17 18 import android.bluetooth.BluetoothA2dpSink; 19 import android.bluetooth.BluetoothAudioConfig; 20 import android.bluetooth.BluetoothDevice; 21 import android.bluetooth.BluetoothProfile; 22 import android.content.Intent; 23 import android.media.AudioFormat; 24 import android.os.Message; 25 import android.util.Log; 26 27 import com.android.bluetooth.BluetoothMetricsProto; 28 import com.android.bluetooth.Utils; 29 import com.android.bluetooth.btservice.MetricsLogger; 30 import com.android.bluetooth.btservice.ProfileService; 31 import com.android.bluetooth.statemachine.State; 32 import com.android.bluetooth.statemachine.StateMachine; 33 34 35 public class A2dpSinkStateMachine extends StateMachine { 36 static final String TAG = "A2DPSinkStateMachine"; 37 static final boolean DBG = Log.isLoggable(TAG, Log.DEBUG); 38 39 //0->99 Events from Outside 40 public static final int CONNECT = 1; 41 public static final int DISCONNECT = 2; 42 43 //100->199 Internal Events 44 protected static final int CLEANUP = 100; 45 private static final int CONNECT_TIMEOUT = 101; 46 47 //200->299 Events from Native 48 static final int STACK_EVENT = 200; 49 50 static final int CONNECT_TIMEOUT_MS = 5000; 51 52 protected final BluetoothDevice mDevice; 53 protected final byte[] mDeviceAddress; 54 protected final A2dpSinkService mService; 55 protected final Disconnected mDisconnected; 56 protected final Connecting mConnecting; 57 protected final Connected mConnected; 58 protected final Disconnecting mDisconnecting; 59 60 protected int mMostRecentState = BluetoothProfile.STATE_DISCONNECTED; 61 protected BluetoothAudioConfig mAudioConfig = null; 62 A2dpSinkStateMachine(BluetoothDevice device, A2dpSinkService service)63 A2dpSinkStateMachine(BluetoothDevice device, A2dpSinkService service) { 64 super(TAG); 65 mDevice = device; 66 mDeviceAddress = Utils.getByteAddress(mDevice); 67 mService = service; 68 if (DBG) Log.d(TAG, device.toString()); 69 70 mDisconnected = new Disconnected(); 71 mConnecting = new Connecting(); 72 mConnected = new Connected(); 73 mDisconnecting = new Disconnecting(); 74 75 addState(mDisconnected); 76 addState(mConnecting); 77 addState(mConnected); 78 addState(mDisconnecting); 79 80 setInitialState(mDisconnected); 81 } 82 getConnectionStateChangedIntent()83 protected String getConnectionStateChangedIntent() { 84 return BluetoothA2dpSink.ACTION_CONNECTION_STATE_CHANGED; 85 } 86 87 /** 88 * Get the current connection state 89 * 90 * @return current State 91 */ getState()92 public int getState() { 93 return mMostRecentState; 94 } 95 96 /** 97 * get current audio config 98 */ getAudioConfig()99 BluetoothAudioConfig getAudioConfig() { 100 return mAudioConfig; 101 } 102 103 /** 104 * Get the underlying device tracked by this state machine 105 * 106 * @return device in focus 107 */ getDevice()108 public synchronized BluetoothDevice getDevice() { 109 return mDevice; 110 } 111 112 /** 113 * send the Connect command asynchronously 114 */ connect()115 public final void connect() { 116 sendMessage(CONNECT); 117 } 118 119 /** 120 * send the Disconnect command asynchronously 121 */ disconnect()122 public final void disconnect() { 123 sendMessage(DISCONNECT); 124 } 125 126 /** 127 * Dump the current State Machine to the string builder. 128 * @param sb output string 129 */ dump(StringBuilder sb)130 public void dump(StringBuilder sb) { 131 ProfileService.println(sb, "mDevice: " + mDevice.getAddress() + "(" 132 + mDevice.getName() + ") " + this.toString()); 133 } 134 135 @Override unhandledMessage(Message msg)136 protected void unhandledMessage(Message msg) { 137 Log.w(TAG, "unhandledMessage in state " + getCurrentState() + "msg.what=" + msg.what); 138 } 139 140 class Disconnected extends State { 141 @Override enter()142 public void enter() { 143 if (DBG) Log.d(TAG, "Enter Disconnected"); 144 if (mMostRecentState != BluetoothProfile.STATE_DISCONNECTED) { 145 sendMessage(CLEANUP); 146 } 147 onConnectionStateChanged(BluetoothProfile.STATE_DISCONNECTED); 148 } 149 150 @Override processMessage(Message message)151 public boolean processMessage(Message message) { 152 switch (message.what) { 153 case STACK_EVENT: 154 processStackEvent((StackEvent) message.obj); 155 return true; 156 case CONNECT: 157 if (DBG) Log.d(TAG, "Connect"); 158 transitionTo(mConnecting); 159 return true; 160 case CLEANUP: 161 mService.removeStateMachine(A2dpSinkStateMachine.this); 162 return true; 163 } 164 return false; 165 } 166 processStackEvent(StackEvent event)167 void processStackEvent(StackEvent event) { 168 switch (event.mType) { 169 case StackEvent.EVENT_TYPE_CONNECTION_STATE_CHANGED: 170 switch (event.mState) { 171 case StackEvent.CONNECTION_STATE_CONNECTING: 172 if (mService.getConnectionPolicy(mDevice) 173 == BluetoothProfile.CONNECTION_POLICY_FORBIDDEN) { 174 Log.w(TAG, "Ignore incoming connection, profile is" 175 + " turned off for " + mDevice); 176 mService.disconnectA2dpNative(mDeviceAddress); 177 } else { 178 mConnecting.mIncomingConnection = true; 179 transitionTo(mConnecting); 180 } 181 break; 182 case StackEvent.CONNECTION_STATE_CONNECTED: 183 transitionTo(mConnected); 184 break; 185 case StackEvent.CONNECTION_STATE_DISCONNECTED: 186 sendMessage(CLEANUP); 187 break; 188 } 189 } 190 } 191 } 192 193 class Connecting extends State { 194 boolean mIncomingConnection = false; 195 196 @Override enter()197 public void enter() { 198 if (DBG) Log.d(TAG, "Enter Connecting"); 199 onConnectionStateChanged(BluetoothProfile.STATE_CONNECTING); 200 sendMessageDelayed(CONNECT_TIMEOUT, CONNECT_TIMEOUT_MS); 201 202 if (!mIncomingConnection) { 203 mService.connectA2dpNative(mDeviceAddress); 204 } 205 206 super.enter(); 207 } 208 209 @Override processMessage(Message message)210 public boolean processMessage(Message message) { 211 switch (message.what) { 212 case STACK_EVENT: 213 processStackEvent((StackEvent) message.obj); 214 return true; 215 case CONNECT_TIMEOUT: 216 transitionTo(mDisconnected); 217 return true; 218 } 219 return false; 220 } 221 processStackEvent(StackEvent event)222 void processStackEvent(StackEvent event) { 223 switch (event.mType) { 224 case StackEvent.EVENT_TYPE_CONNECTION_STATE_CHANGED: 225 switch (event.mState) { 226 case StackEvent.CONNECTION_STATE_CONNECTED: 227 transitionTo(mConnected); 228 break; 229 case StackEvent.CONNECTION_STATE_DISCONNECTED: 230 transitionTo(mDisconnected); 231 break; 232 } 233 } 234 } 235 @Override exit()236 public void exit() { 237 removeMessages(CONNECT_TIMEOUT); 238 mIncomingConnection = false; 239 } 240 241 } 242 243 class Connected extends State { 244 @Override enter()245 public void enter() { 246 if (DBG) Log.d(TAG, "Enter Connected"); 247 onConnectionStateChanged(BluetoothProfile.STATE_CONNECTED); 248 } 249 250 @Override processMessage(Message message)251 public boolean processMessage(Message message) { 252 switch (message.what) { 253 case DISCONNECT: 254 transitionTo(mDisconnecting); 255 mService.disconnectA2dpNative(mDeviceAddress); 256 return true; 257 case STACK_EVENT: 258 processStackEvent((StackEvent) message.obj); 259 return true; 260 } 261 return false; 262 } 263 processStackEvent(StackEvent event)264 void processStackEvent(StackEvent event) { 265 switch (event.mType) { 266 case StackEvent.EVENT_TYPE_CONNECTION_STATE_CHANGED: 267 switch (event.mState) { 268 case StackEvent.CONNECTION_STATE_DISCONNECTING: 269 transitionTo(mDisconnecting); 270 break; 271 case StackEvent.CONNECTION_STATE_DISCONNECTED: 272 transitionTo(mDisconnected); 273 break; 274 } 275 break; 276 case StackEvent.EVENT_TYPE_AUDIO_CONFIG_CHANGED: 277 mAudioConfig = new BluetoothAudioConfig(event.mSampleRate, event.mChannelCount, 278 AudioFormat.ENCODING_PCM_16BIT); 279 break; 280 } 281 } 282 } 283 284 protected class Disconnecting extends State { 285 @Override enter()286 public void enter() { 287 if (DBG) Log.d(TAG, "Enter Disconnecting"); 288 onConnectionStateChanged(BluetoothProfile.STATE_DISCONNECTING); 289 transitionTo(mDisconnected); 290 } 291 } 292 onConnectionStateChanged(int currentState)293 protected void onConnectionStateChanged(int currentState) { 294 if (mMostRecentState == currentState) { 295 return; 296 } 297 if (currentState == BluetoothProfile.STATE_CONNECTED) { 298 MetricsLogger.logProfileConnectionEvent(BluetoothMetricsProto.ProfileId.A2DP_SINK); 299 } 300 if (DBG) { 301 Log.d(TAG, "Connection state " + mDevice + ": " + mMostRecentState + "->" 302 + currentState); 303 } 304 Intent intent = new Intent(BluetoothA2dpSink.ACTION_CONNECTION_STATE_CHANGED); 305 intent.putExtra(BluetoothProfile.EXTRA_PREVIOUS_STATE, mMostRecentState); 306 intent.putExtra(BluetoothProfile.EXTRA_STATE, currentState); 307 intent.putExtra(BluetoothDevice.EXTRA_DEVICE, mDevice); 308 intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); 309 mMostRecentState = currentState; 310 mService.sendBroadcast(intent, ProfileService.BLUETOOTH_PERM); 311 } 312 } 313