1 /* 2 * Copyright (C) 2011 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.app.PendingIntent; 20 import android.content.ComponentName; 21 import android.content.Intent; 22 import android.graphics.Bitmap; 23 import android.media.session.MediaSessionLegacyHelper; 24 import android.media.session.PlaybackState; 25 import android.media.session.MediaSession; 26 import android.os.Bundle; 27 import android.os.Handler; 28 import android.os.Looper; 29 import android.os.Message; 30 import android.os.SystemClock; 31 import android.util.Log; 32 33 import java.lang.IllegalArgumentException; 34 35 /** 36 * RemoteControlClient enables exposing information meant to be consumed by remote controls 37 * capable of displaying metadata, artwork and media transport control buttons. 38 * 39 * <p>A remote control client object is associated with a media button event receiver. This 40 * event receiver must have been previously registered with 41 * {@link AudioManager#registerMediaButtonEventReceiver(ComponentName)} before the 42 * RemoteControlClient can be registered through 43 * {@link AudioManager#registerRemoteControlClient(RemoteControlClient)}. 44 * 45 * <p>Here is an example of creating a RemoteControlClient instance after registering a media 46 * button event receiver: 47 * <pre>ComponentName myEventReceiver = new ComponentName(getPackageName(), MyRemoteControlEventReceiver.class.getName()); 48 * AudioManager myAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 49 * myAudioManager.registerMediaButtonEventReceiver(myEventReceiver); 50 * // build the PendingIntent for the remote control client 51 * Intent mediaButtonIntent = new Intent(Intent.ACTION_MEDIA_BUTTON); 52 * mediaButtonIntent.setComponent(myEventReceiver); 53 * PendingIntent mediaPendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, mediaButtonIntent, 0); 54 * // create and register the remote control client 55 * RemoteControlClient myRemoteControlClient = new RemoteControlClient(mediaPendingIntent); 56 * myAudioManager.registerRemoteControlClient(myRemoteControlClient);</pre> 57 * 58 * @deprecated Use {@link MediaSession} instead. 59 */ 60 @Deprecated public class RemoteControlClient 61 { 62 private final static String TAG = "RemoteControlClient"; 63 private final static boolean DEBUG = false; 64 65 /** 66 * Playback state of a RemoteControlClient which is stopped. 67 * 68 * @see #setPlaybackState(int) 69 */ 70 public final static int PLAYSTATE_STOPPED = 1; 71 /** 72 * Playback state of a RemoteControlClient which is paused. 73 * 74 * @see #setPlaybackState(int) 75 */ 76 public final static int PLAYSTATE_PAUSED = 2; 77 /** 78 * Playback state of a RemoteControlClient which is playing media. 79 * 80 * @see #setPlaybackState(int) 81 */ 82 public final static int PLAYSTATE_PLAYING = 3; 83 /** 84 * Playback state of a RemoteControlClient which is fast forwarding in the media 85 * it is currently playing. 86 * 87 * @see #setPlaybackState(int) 88 */ 89 public final static int PLAYSTATE_FAST_FORWARDING = 4; 90 /** 91 * Playback state of a RemoteControlClient which is fast rewinding in the media 92 * it is currently playing. 93 * 94 * @see #setPlaybackState(int) 95 */ 96 public final static int PLAYSTATE_REWINDING = 5; 97 /** 98 * Playback state of a RemoteControlClient which is skipping to the next 99 * logical chapter (such as a song in a playlist) in the media it is currently playing. 100 * 101 * @see #setPlaybackState(int) 102 */ 103 public final static int PLAYSTATE_SKIPPING_FORWARDS = 6; 104 /** 105 * Playback state of a RemoteControlClient which is skipping back to the previous 106 * logical chapter (such as a song in a playlist) in the media it is currently playing. 107 * 108 * @see #setPlaybackState(int) 109 */ 110 public final static int PLAYSTATE_SKIPPING_BACKWARDS = 7; 111 /** 112 * Playback state of a RemoteControlClient which is buffering data to play before it can 113 * start or resume playback. 114 * 115 * @see #setPlaybackState(int) 116 */ 117 public final static int PLAYSTATE_BUFFERING = 8; 118 /** 119 * Playback state of a RemoteControlClient which cannot perform any playback related 120 * operation because of an internal error. Examples of such situations are no network 121 * connectivity when attempting to stream data from a server, or expired user credentials 122 * when trying to play subscription-based content. 123 * 124 * @see #setPlaybackState(int) 125 */ 126 public final static int PLAYSTATE_ERROR = 9; 127 /** 128 * @hide 129 * The value of a playback state when none has been declared. 130 * Intentionally hidden as an application shouldn't set such a playback state value. 131 */ 132 public final static int PLAYSTATE_NONE = 0; 133 134 /** 135 * @hide 136 * The default playback type, "local", indicating the presentation of the media is happening on 137 * the same device (e.g. a phone, a tablet) as where it is controlled from. 138 */ 139 public final static int PLAYBACK_TYPE_LOCAL = 0; 140 /** 141 * @hide 142 * A playback type indicating the presentation of the media is happening on 143 * a different device (i.e. the remote device) than where it is controlled from. 144 */ 145 public final static int PLAYBACK_TYPE_REMOTE = 1; 146 private final static int PLAYBACK_TYPE_MIN = PLAYBACK_TYPE_LOCAL; 147 private final static int PLAYBACK_TYPE_MAX = PLAYBACK_TYPE_REMOTE; 148 /** 149 * @hide 150 * Playback information indicating the playback volume is fixed, i.e. it cannot be controlled 151 * from this object. An example of fixed playback volume is a remote player, playing over HDMI 152 * where the user prefer to control the volume on the HDMI sink, rather than attenuate at the 153 * source. 154 * @see #PLAYBACKINFO_VOLUME_HANDLING. 155 */ 156 public final static int PLAYBACK_VOLUME_FIXED = 0; 157 /** 158 * @hide 159 * Playback information indicating the playback volume is variable and can be controlled from 160 * this object. 161 * @see #PLAYBACKINFO_VOLUME_HANDLING. 162 */ 163 public final static int PLAYBACK_VOLUME_VARIABLE = 1; 164 /** 165 * @hide (to be un-hidden) 166 * The playback information value indicating the value of a given information type is invalid. 167 * @see #PLAYBACKINFO_VOLUME_HANDLING. 168 */ 169 public final static int PLAYBACKINFO_INVALID_VALUE = Integer.MIN_VALUE; 170 171 /** 172 * @hide 173 * An unknown or invalid playback position value. 174 */ 175 public final static long PLAYBACK_POSITION_INVALID = -1; 176 /** 177 * @hide 178 * An invalid playback position value associated with the use of {@link #setPlaybackState(int)} 179 * used to indicate that playback position will remain unknown. 180 */ 181 public final static long PLAYBACK_POSITION_ALWAYS_UNKNOWN = 0x8019771980198300L; 182 /** 183 * @hide 184 * The default playback speed, 1x. 185 */ 186 public final static float PLAYBACK_SPEED_1X = 1.0f; 187 188 //========================================== 189 // Public keys for playback information 190 /** 191 * @hide 192 * Playback information that defines the type of playback associated with this 193 * RemoteControlClient. See {@link #PLAYBACK_TYPE_LOCAL} and {@link #PLAYBACK_TYPE_REMOTE}. 194 */ 195 public final static int PLAYBACKINFO_PLAYBACK_TYPE = 1; 196 /** 197 * @hide 198 * Playback information that defines at what volume the playback associated with this 199 * RemoteControlClient is performed. This information is only used when the playback type is not 200 * local (see {@link #PLAYBACKINFO_PLAYBACK_TYPE}). 201 */ 202 public final static int PLAYBACKINFO_VOLUME = 2; 203 /** 204 * @hide 205 * Playback information that defines the maximum volume volume value that is supported 206 * by the playback associated with this RemoteControlClient. This information is only used 207 * when the playback type is not local (see {@link #PLAYBACKINFO_PLAYBACK_TYPE}). 208 */ 209 public final static int PLAYBACKINFO_VOLUME_MAX = 3; 210 /** 211 * @hide 212 * Playback information that defines how volume is handled for the presentation of the media. 213 * @see #PLAYBACK_VOLUME_FIXED 214 * @see #PLAYBACK_VOLUME_VARIABLE 215 */ 216 public final static int PLAYBACKINFO_VOLUME_HANDLING = 4; 217 /** 218 * @hide 219 * Playback information that defines over what stream type the media is presented. 220 */ 221 public final static int PLAYBACKINFO_USES_STREAM = 5; 222 223 //========================================== 224 // Public flags for the supported transport control capabilities 225 /** 226 * Flag indicating a RemoteControlClient makes use of the "previous" media key. 227 * 228 * @see #setTransportControlFlags(int) 229 * @see android.view.KeyEvent#KEYCODE_MEDIA_PREVIOUS 230 */ 231 public final static int FLAG_KEY_MEDIA_PREVIOUS = 1 << 0; 232 /** 233 * Flag indicating a RemoteControlClient makes use of the "rewind" media key. 234 * 235 * @see #setTransportControlFlags(int) 236 * @see android.view.KeyEvent#KEYCODE_MEDIA_REWIND 237 */ 238 public final static int FLAG_KEY_MEDIA_REWIND = 1 << 1; 239 /** 240 * Flag indicating a RemoteControlClient makes use of the "play" media key. 241 * 242 * @see #setTransportControlFlags(int) 243 * @see android.view.KeyEvent#KEYCODE_MEDIA_PLAY 244 */ 245 public final static int FLAG_KEY_MEDIA_PLAY = 1 << 2; 246 /** 247 * Flag indicating a RemoteControlClient makes use of the "play/pause" media key. 248 * 249 * @see #setTransportControlFlags(int) 250 * @see android.view.KeyEvent#KEYCODE_MEDIA_PLAY_PAUSE 251 */ 252 public final static int FLAG_KEY_MEDIA_PLAY_PAUSE = 1 << 3; 253 /** 254 * Flag indicating a RemoteControlClient makes use of the "pause" media key. 255 * 256 * @see #setTransportControlFlags(int) 257 * @see android.view.KeyEvent#KEYCODE_MEDIA_PAUSE 258 */ 259 public final static int FLAG_KEY_MEDIA_PAUSE = 1 << 4; 260 /** 261 * Flag indicating a RemoteControlClient makes use of the "stop" media key. 262 * 263 * @see #setTransportControlFlags(int) 264 * @see android.view.KeyEvent#KEYCODE_MEDIA_STOP 265 */ 266 public final static int FLAG_KEY_MEDIA_STOP = 1 << 5; 267 /** 268 * Flag indicating a RemoteControlClient makes use of the "fast forward" media key. 269 * 270 * @see #setTransportControlFlags(int) 271 * @see android.view.KeyEvent#KEYCODE_MEDIA_FAST_FORWARD 272 */ 273 public final static int FLAG_KEY_MEDIA_FAST_FORWARD = 1 << 6; 274 /** 275 * Flag indicating a RemoteControlClient makes use of the "next" media key. 276 * 277 * @see #setTransportControlFlags(int) 278 * @see android.view.KeyEvent#KEYCODE_MEDIA_NEXT 279 */ 280 public final static int FLAG_KEY_MEDIA_NEXT = 1 << 7; 281 /** 282 * Flag indicating a RemoteControlClient can receive changes in the media playback position 283 * through the {@link OnPlaybackPositionUpdateListener} interface. This flag must be set 284 * in order for components that display the RemoteControlClient information, to display and 285 * let the user control media playback position. 286 * @see #setTransportControlFlags(int) 287 * @see #setOnGetPlaybackPositionListener(OnGetPlaybackPositionListener) 288 * @see #setPlaybackPositionUpdateListener(OnPlaybackPositionUpdateListener) 289 */ 290 public final static int FLAG_KEY_MEDIA_POSITION_UPDATE = 1 << 8; 291 /** 292 * Flag indicating a RemoteControlClient supports ratings. 293 * This flag must be set in order for components that display the RemoteControlClient 294 * information, to display ratings information, and, if ratings are declared editable 295 * (by calling {@link MediaMetadataEditor#addEditableKey(int)} with the 296 * {@link MediaMetadataEditor#RATING_KEY_BY_USER} key), it will enable the user to rate 297 * the media, with values being received through the interface set with 298 * {@link #setMetadataUpdateListener(OnMetadataUpdateListener)}. 299 * @see #setTransportControlFlags(int) 300 */ 301 public final static int FLAG_KEY_MEDIA_RATING = 1 << 9; 302 303 /** 304 * @hide 305 * The flags for when no media keys are declared supported. 306 * Intentionally hidden as an application shouldn't set the transport control flags 307 * to this value. 308 */ 309 public final static int FLAGS_KEY_MEDIA_NONE = 0; 310 311 /** 312 * @hide 313 * Flag used to signal some type of metadata exposed by the RemoteControlClient is requested. 314 */ 315 public final static int FLAG_INFORMATION_REQUEST_METADATA = 1 << 0; 316 /** 317 * @hide 318 * Flag used to signal that the transport control buttons supported by the 319 * RemoteControlClient are requested. 320 * This can for instance happen when playback is at the end of a playlist, and the "next" 321 * operation is not supported anymore. 322 */ 323 public final static int FLAG_INFORMATION_REQUEST_KEY_MEDIA = 1 << 1; 324 /** 325 * @hide 326 * Flag used to signal that the playback state of the RemoteControlClient is requested. 327 */ 328 public final static int FLAG_INFORMATION_REQUEST_PLAYSTATE = 1 << 2; 329 /** 330 * @hide 331 * Flag used to signal that the album art for the RemoteControlClient is requested. 332 */ 333 public final static int FLAG_INFORMATION_REQUEST_ALBUM_ART = 1 << 3; 334 335 private MediaSession mSession; 336 337 /** 338 * Class constructor. 339 * @param mediaButtonIntent The intent that will be sent for the media button events sent 340 * by remote controls. 341 * This intent needs to have been constructed with the {@link Intent#ACTION_MEDIA_BUTTON} 342 * action, and have a component that will handle the intent (set with 343 * {@link Intent#setComponent(ComponentName)}) registered with 344 * {@link AudioManager#registerMediaButtonEventReceiver(ComponentName)} 345 * before this new RemoteControlClient can itself be registered with 346 * {@link AudioManager#registerRemoteControlClient(RemoteControlClient)}. 347 * @see AudioManager#registerMediaButtonEventReceiver(ComponentName) 348 * @see AudioManager#registerRemoteControlClient(RemoteControlClient) 349 */ 350 public RemoteControlClient(PendingIntent mediaButtonIntent) { 351 mRcMediaIntent = mediaButtonIntent; 352 } 353 354 /** 355 * Class constructor for a remote control client whose internal event handling 356 * happens on a user-provided Looper. 357 * @param mediaButtonIntent The intent that will be sent for the media button events sent 358 * by remote controls. 359 * This intent needs to have been constructed with the {@link Intent#ACTION_MEDIA_BUTTON} 360 * action, and have a component that will handle the intent (set with 361 * {@link Intent#setComponent(ComponentName)}) registered with 362 * {@link AudioManager#registerMediaButtonEventReceiver(ComponentName)} 363 * before this new RemoteControlClient can itself be registered with 364 * {@link AudioManager#registerRemoteControlClient(RemoteControlClient)}. 365 * @param looper The Looper running the event loop. 366 * @see AudioManager#registerMediaButtonEventReceiver(ComponentName) 367 * @see AudioManager#registerRemoteControlClient(RemoteControlClient) 368 */ 369 public RemoteControlClient(PendingIntent mediaButtonIntent, Looper looper) { 370 mRcMediaIntent = mediaButtonIntent; 371 } 372 373 /** 374 * @hide 375 */ 376 public void registerWithSession(MediaSessionLegacyHelper helper) { 377 helper.addRccListener(mRcMediaIntent, mTransportListener); 378 mSession = helper.getSession(mRcMediaIntent); 379 setTransportControlFlags(mTransportControlFlags); 380 } 381 382 /** 383 * @hide 384 */ 385 public void unregisterWithSession(MediaSessionLegacyHelper helper) { 386 helper.removeRccListener(mRcMediaIntent); 387 mSession = null; 388 } 389 390 /** 391 * Get a {@link MediaSession} associated with this RCC. It will only have a 392 * session while it is registered with 393 * {@link AudioManager#registerRemoteControlClient}. The session returned 394 * should not be modified directly by the application but may be used with 395 * other APIs that require a session. 396 * 397 * @return A media session object or null. 398 */ 399 public MediaSession getMediaSession() { 400 return mSession; 401 } 402 403 /** 404 * Class used to modify metadata in a {@link RemoteControlClient} object. 405 * Use {@link RemoteControlClient#editMetadata(boolean)} to create an instance of an editor, 406 * on which you set the metadata for the RemoteControlClient instance. Once all the information 407 * has been set, use {@link #apply()} to make it the new metadata that should be displayed 408 * for the associated client. Once the metadata has been "applied", you cannot reuse this 409 * instance of the MetadataEditor. 410 * 411 * @deprecated Use {@link MediaMetadata} and {@link MediaSession} instead. 412 */ 413 @Deprecated public class MetadataEditor extends MediaMetadataEditor { 414 415 // only use RemoteControlClient.editMetadata() to get a MetadataEditor instance 416 private MetadataEditor() { } 417 /** 418 * @hide 419 */ 420 public Object clone() throws CloneNotSupportedException { 421 throw new CloneNotSupportedException(); 422 } 423 424 /** 425 * The metadata key for the content artwork / album art. 426 */ 427 public final static int BITMAP_KEY_ARTWORK = 100; 428 429 /** 430 * @hide 431 * TODO(jmtrivi) have lockscreen move to the new key name and remove 432 */ 433 public final static int METADATA_KEY_ARTWORK = BITMAP_KEY_ARTWORK; 434 435 /** 436 * Adds textual information to be displayed. 437 * Note that none of the information added after {@link #apply()} has been called, 438 * will be displayed. 439 * @param key The identifier of a the metadata field to set. Valid values are 440 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_ALBUM}, 441 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_ALBUMARTIST}, 442 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_TITLE}, 443 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_ARTIST}, 444 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_AUTHOR}, 445 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_COMPILATION}, 446 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_COMPOSER}, 447 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_DATE}, 448 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_GENRE}, 449 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_TITLE}, 450 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_WRITER}. 451 * @param value The text for the given key, or {@code null} to signify there is no valid 452 * information for the field. 453 * @return Returns a reference to the same MetadataEditor object, so you can chain put 454 * calls together. 455 */ 456 public synchronized MetadataEditor putString(int key, String value) 457 throws IllegalArgumentException { 458 super.putString(key, value); 459 if (mMetadataBuilder != null) { 460 // MediaMetadata supports all the same fields as MetadataEditor 461 String metadataKey = MediaMetadata.getKeyFromMetadataEditorKey(key); 462 // But just in case, don't add things we don't understand 463 if (metadataKey != null) { 464 mMetadataBuilder.putText(metadataKey, value); 465 } 466 } 467 468 return this; 469 } 470 471 /** 472 * Adds numerical information to be displayed. 473 * Note that none of the information added after {@link #apply()} has been called, 474 * will be displayed. 475 * @param key the identifier of a the metadata field to set. Valid values are 476 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_CD_TRACK_NUMBER}, 477 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_DISC_NUMBER}, 478 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_DURATION} (with a value 479 * expressed in milliseconds), 480 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_YEAR}. 481 * @param value The long value for the given key 482 * @return Returns a reference to the same MetadataEditor object, so you can chain put 483 * calls together. 484 * @throws IllegalArgumentException 485 */ 486 public synchronized MetadataEditor putLong(int key, long value) 487 throws IllegalArgumentException { 488 super.putLong(key, value); 489 if (mMetadataBuilder != null) { 490 // MediaMetadata supports all the same fields as MetadataEditor 491 String metadataKey = MediaMetadata.getKeyFromMetadataEditorKey(key); 492 // But just in case, don't add things we don't understand 493 if (metadataKey != null) { 494 mMetadataBuilder.putLong(metadataKey, value); 495 } 496 } 497 return this; 498 } 499 500 /** 501 * Sets the album / artwork picture to be displayed on the remote control. 502 * @param key the identifier of the bitmap to set. The only valid value is 503 * {@link #BITMAP_KEY_ARTWORK} 504 * @param bitmap The bitmap for the artwork, or null if there isn't any. 505 * @return Returns a reference to the same MetadataEditor object, so you can chain put 506 * calls together. 507 * @throws IllegalArgumentException 508 * @see android.graphics.Bitmap 509 */ 510 @Override 511 public synchronized MetadataEditor putBitmap(int key, Bitmap bitmap) 512 throws IllegalArgumentException { 513 super.putBitmap(key, bitmap); 514 if (mMetadataBuilder != null) { 515 // MediaMetadata supports all the same fields as MetadataEditor 516 String metadataKey = MediaMetadata.getKeyFromMetadataEditorKey(key); 517 // But just in case, don't add things we don't understand 518 if (metadataKey != null) { 519 mMetadataBuilder.putBitmap(metadataKey, bitmap); 520 } 521 } 522 return this; 523 } 524 525 @Override 526 public synchronized MetadataEditor putObject(int key, Object object) 527 throws IllegalArgumentException { 528 super.putObject(key, object); 529 if (mMetadataBuilder != null && 530 (key == MediaMetadataEditor.RATING_KEY_BY_USER || 531 key == MediaMetadataEditor.RATING_KEY_BY_OTHERS)) { 532 String metadataKey = MediaMetadata.getKeyFromMetadataEditorKey(key); 533 if (metadataKey != null) { 534 mMetadataBuilder.putRating(metadataKey, (Rating) object); 535 } 536 } 537 return this; 538 } 539 540 /** 541 * Clears all the metadata that has been set since the MetadataEditor instance was created 542 * (with {@link RemoteControlClient#editMetadata(boolean)}). 543 * Note that clearing the metadata doesn't reset the editable keys 544 * (use {@link MediaMetadataEditor#removeEditableKeys()} instead). 545 */ 546 @Override 547 public synchronized void clear() { 548 super.clear(); 549 } 550 551 /** 552 * Associates all the metadata that has been set since the MetadataEditor instance was 553 * created with {@link RemoteControlClient#editMetadata(boolean)}, or since 554 * {@link #clear()} was called, with the RemoteControlClient. Once "applied", 555 * this MetadataEditor cannot be reused to edit the RemoteControlClient's metadata. 556 */ 557 public synchronized void apply() { 558 if (mApplied) { 559 Log.e(TAG, "Can't apply a previously applied MetadataEditor"); 560 return; 561 } 562 synchronized (mCacheLock) { 563 // Still build the old metadata so when creating a new editor 564 // you get the expected values. 565 // assign the edited data 566 mMetadata = new Bundle(mEditorMetadata); 567 // add the information about editable keys 568 mMetadata.putLong(String.valueOf(KEY_EDITABLE_MASK), mEditableKeys); 569 if ((mOriginalArtwork != null) && (!mOriginalArtwork.equals(mEditorArtwork))) { 570 mOriginalArtwork.recycle(); 571 } 572 mOriginalArtwork = mEditorArtwork; 573 mEditorArtwork = null; 574 575 // USE_SESSIONS 576 if (mSession != null && mMetadataBuilder != null) { 577 mMediaMetadata = mMetadataBuilder.build(); 578 mSession.setMetadata(mMediaMetadata); 579 } 580 mApplied = true; 581 } 582 } 583 } 584 585 /** 586 * Creates a {@link MetadataEditor}. 587 * @param startEmpty Set to false if you want the MetadataEditor to contain the metadata that 588 * was previously applied to the RemoteControlClient, or true if it is to be created empty. 589 * @return a new MetadataEditor instance. 590 */ 591 public MetadataEditor editMetadata(boolean startEmpty) { 592 MetadataEditor editor = new MetadataEditor(); 593 if (startEmpty) { 594 editor.mEditorMetadata = new Bundle(); 595 editor.mEditorArtwork = null; 596 editor.mMetadataChanged = true; 597 editor.mArtworkChanged = true; 598 editor.mEditableKeys = 0; 599 } else { 600 editor.mEditorMetadata = new Bundle(mMetadata); 601 editor.mEditorArtwork = mOriginalArtwork; 602 editor.mMetadataChanged = false; 603 editor.mArtworkChanged = false; 604 } 605 // USE_SESSIONS 606 if (startEmpty || mMediaMetadata == null) { 607 editor.mMetadataBuilder = new MediaMetadata.Builder(); 608 } else { 609 editor.mMetadataBuilder = new MediaMetadata.Builder(mMediaMetadata); 610 } 611 return editor; 612 } 613 614 /** 615 * Sets the current playback state. 616 * @param state The current playback state, one of the following values: 617 * {@link #PLAYSTATE_STOPPED}, 618 * {@link #PLAYSTATE_PAUSED}, 619 * {@link #PLAYSTATE_PLAYING}, 620 * {@link #PLAYSTATE_FAST_FORWARDING}, 621 * {@link #PLAYSTATE_REWINDING}, 622 * {@link #PLAYSTATE_SKIPPING_FORWARDS}, 623 * {@link #PLAYSTATE_SKIPPING_BACKWARDS}, 624 * {@link #PLAYSTATE_BUFFERING}, 625 * {@link #PLAYSTATE_ERROR}. 626 */ 627 public void setPlaybackState(int state) { 628 setPlaybackStateInt(state, PLAYBACK_POSITION_ALWAYS_UNKNOWN, PLAYBACK_SPEED_1X, 629 false /* legacy API, converting to method with position and speed */); 630 } 631 632 /** 633 * Sets the current playback state and the matching media position for the current playback 634 * speed. 635 * @param state The current playback state, one of the following values: 636 * {@link #PLAYSTATE_STOPPED}, 637 * {@link #PLAYSTATE_PAUSED}, 638 * {@link #PLAYSTATE_PLAYING}, 639 * {@link #PLAYSTATE_FAST_FORWARDING}, 640 * {@link #PLAYSTATE_REWINDING}, 641 * {@link #PLAYSTATE_SKIPPING_FORWARDS}, 642 * {@link #PLAYSTATE_SKIPPING_BACKWARDS}, 643 * {@link #PLAYSTATE_BUFFERING}, 644 * {@link #PLAYSTATE_ERROR}. 645 * @param timeInMs a 0 or positive value for the current media position expressed in ms 646 * (same unit as for when sending the media duration, if applicable, with 647 * {@link android.media.MediaMetadataRetriever#METADATA_KEY_DURATION} in the 648 * {@link RemoteControlClient.MetadataEditor}). Negative values imply that position is not 649 * known (e.g. listening to a live stream of a radio) or not applicable (e.g. when state 650 * is {@link #PLAYSTATE_BUFFERING} and nothing had played yet). 651 * @param playbackSpeed a value expressed as a ratio of 1x playback: 1.0f is normal playback, 652 * 2.0f is 2x, 0.5f is half-speed, -2.0f is rewind at 2x speed. 0.0f means nothing is 653 * playing (e.g. when state is {@link #PLAYSTATE_ERROR}). 654 */ 655 public void setPlaybackState(int state, long timeInMs, float playbackSpeed) { 656 setPlaybackStateInt(state, timeInMs, playbackSpeed, true); 657 } 658 659 private void setPlaybackStateInt(int state, long timeInMs, float playbackSpeed, 660 boolean hasPosition) { 661 synchronized(mCacheLock) { 662 if ((mPlaybackState != state) || (mPlaybackPositionMs != timeInMs) 663 || (mPlaybackSpeed != playbackSpeed)) { 664 // store locally 665 mPlaybackState = state; 666 // distinguish between an application not knowing the current playback position 667 // at the moment and an application using the API where only the playback state 668 // is passed, not the playback position. 669 if (hasPosition) { 670 if (timeInMs < 0) { 671 mPlaybackPositionMs = PLAYBACK_POSITION_INVALID; 672 } else { 673 mPlaybackPositionMs = timeInMs; 674 } 675 } else { 676 mPlaybackPositionMs = PLAYBACK_POSITION_ALWAYS_UNKNOWN; 677 } 678 mPlaybackSpeed = playbackSpeed; 679 // keep track of when the state change occurred 680 mPlaybackStateChangeTimeMs = SystemClock.elapsedRealtime(); 681 682 // USE_SESSIONS 683 if (mSession != null) { 684 int pbState = PlaybackState.getStateFromRccState(state); 685 long position = hasPosition ? mPlaybackPositionMs 686 : PlaybackState.PLAYBACK_POSITION_UNKNOWN; 687 688 PlaybackState.Builder bob = new PlaybackState.Builder(mSessionPlaybackState); 689 bob.setState(pbState, position, playbackSpeed, SystemClock.elapsedRealtime()); 690 bob.setErrorMessage(null); 691 mSessionPlaybackState = bob.build(); 692 mSession.setPlaybackState(mSessionPlaybackState); 693 } 694 } 695 } 696 } 697 698 /** 699 * Sets the flags for the media transport control buttons that this client supports. 700 * @param transportControlFlags A combination of the following flags: 701 * {@link #FLAG_KEY_MEDIA_PREVIOUS}, 702 * {@link #FLAG_KEY_MEDIA_REWIND}, 703 * {@link #FLAG_KEY_MEDIA_PLAY}, 704 * {@link #FLAG_KEY_MEDIA_PLAY_PAUSE}, 705 * {@link #FLAG_KEY_MEDIA_PAUSE}, 706 * {@link #FLAG_KEY_MEDIA_STOP}, 707 * {@link #FLAG_KEY_MEDIA_FAST_FORWARD}, 708 * {@link #FLAG_KEY_MEDIA_NEXT}, 709 * {@link #FLAG_KEY_MEDIA_POSITION_UPDATE}, 710 * {@link #FLAG_KEY_MEDIA_RATING}. 711 */ 712 public void setTransportControlFlags(int transportControlFlags) { 713 synchronized(mCacheLock) { 714 // store locally 715 mTransportControlFlags = transportControlFlags; 716 717 // USE_SESSIONS 718 if (mSession != null) { 719 PlaybackState.Builder bob = new PlaybackState.Builder(mSessionPlaybackState); 720 bob.setActions( 721 PlaybackState.getActionsFromRccControlFlags(transportControlFlags)); 722 mSessionPlaybackState = bob.build(); 723 mSession.setPlaybackState(mSessionPlaybackState); 724 } 725 } 726 } 727 728 /** 729 * Interface definition for a callback to be invoked when one of the metadata values has 730 * been updated. 731 * Implement this interface to receive metadata updates after registering your listener 732 * through {@link RemoteControlClient#setMetadataUpdateListener(OnMetadataUpdateListener)}. 733 */ 734 public interface OnMetadataUpdateListener { 735 /** 736 * Called on the implementer to notify that the metadata field for the given key has 737 * been updated to the new value. 738 * @param key the identifier of the updated metadata field. 739 * @param newValue the Object storing the new value for the key. 740 */ 741 public abstract void onMetadataUpdate(int key, Object newValue); 742 } 743 744 /** 745 * Sets the listener to be called whenever the metadata is updated. 746 * New metadata values will be received in the same thread as the one in which 747 * RemoteControlClient was created. 748 * @param l the metadata update listener 749 */ 750 public void setMetadataUpdateListener(OnMetadataUpdateListener l) { 751 synchronized(mCacheLock) { 752 mMetadataUpdateListener = l; 753 } 754 } 755 756 757 /** 758 * Interface definition for a callback to be invoked when the media playback position is 759 * requested to be updated. 760 * @see RemoteControlClient#FLAG_KEY_MEDIA_POSITION_UPDATE 761 */ 762 public interface OnPlaybackPositionUpdateListener { 763 /** 764 * Called on the implementer to notify it that the playback head should be set at the given 765 * position. If the position can be changed from its current value, the implementor of 766 * the interface must also update the playback position using 767 * {@link #setPlaybackState(int, long, float)} to reflect the actual new 768 * position being used, regardless of whether it differs from the requested position. 769 * Failure to do so would cause the system to not know the new actual playback position, 770 * and user interface components would fail to show the user where playback resumed after 771 * the position was updated. 772 * @param newPositionMs the new requested position in the current media, expressed in ms. 773 */ 774 void onPlaybackPositionUpdate(long newPositionMs); 775 } 776 777 /** 778 * Interface definition for a callback to be invoked when the media playback position is 779 * queried. 780 * @see RemoteControlClient#FLAG_KEY_MEDIA_POSITION_UPDATE 781 */ 782 public interface OnGetPlaybackPositionListener { 783 /** 784 * Called on the implementer of the interface to query the current playback position. 785 * @return a negative value if the current playback position (or the last valid playback 786 * position) is not known, or a zero or positive value expressed in ms indicating the 787 * current position, or the last valid known position. 788 */ 789 long onGetPlaybackPosition(); 790 } 791 792 /** 793 * Sets the listener to be called whenever the media playback position is requested 794 * to be updated. 795 * Notifications will be received in the same thread as the one in which RemoteControlClient 796 * was created. 797 * @param l the position update listener to be called 798 */ 799 public void setPlaybackPositionUpdateListener(OnPlaybackPositionUpdateListener l) { 800 synchronized(mCacheLock) { 801 mPositionUpdateListener = l; 802 } 803 } 804 805 /** 806 * Sets the listener to be called whenever the media current playback position is needed. 807 * Queries will be received in the same thread as the one in which RemoteControlClient 808 * was created. 809 * @param l the listener to be called to retrieve the playback position 810 */ 811 public void setOnGetPlaybackPositionListener(OnGetPlaybackPositionListener l) { 812 synchronized(mCacheLock) { 813 mPositionProvider = l; 814 } 815 } 816 817 /** 818 * @hide 819 * Flag to reflect that the application controlling this RemoteControlClient sends playback 820 * position updates. The playback position being "readable" is considered from the application's 821 * point of view. 822 */ 823 public static int MEDIA_POSITION_READABLE = 1 << 0; 824 /** 825 * @hide 826 * Flag to reflect that the application controlling this RemoteControlClient can receive 827 * playback position updates. The playback position being "writable" 828 * is considered from the application's point of view. 829 */ 830 public static int MEDIA_POSITION_WRITABLE = 1 << 1; 831 832 /** @hide */ 833 public final static int DEFAULT_PLAYBACK_VOLUME_HANDLING = PLAYBACK_VOLUME_VARIABLE; 834 /** @hide */ 835 // hard-coded to the same number of steps as AudioService.MAX_STREAM_VOLUME[STREAM_MUSIC] 836 public final static int DEFAULT_PLAYBACK_VOLUME = 15; 837 838 /** 839 * Lock for all cached data 840 */ 841 private final Object mCacheLock = new Object(); 842 /** 843 * Cache for the playback state. 844 * Access synchronized on mCacheLock 845 */ 846 private int mPlaybackState = PLAYSTATE_NONE; 847 /** 848 * Time of last play state change 849 * Access synchronized on mCacheLock 850 */ 851 private long mPlaybackStateChangeTimeMs = 0; 852 /** 853 * Last playback position in ms reported by the user 854 */ 855 private long mPlaybackPositionMs = PLAYBACK_POSITION_INVALID; 856 /** 857 * Last playback speed reported by the user 858 */ 859 private float mPlaybackSpeed = PLAYBACK_SPEED_1X; 860 /** 861 * Cache for the artwork bitmap. 862 * Access synchronized on mCacheLock 863 * Artwork and metadata are not kept in one Bundle because the bitmap sometimes needs to be 864 * accessed to be resized, in which case a copy will be made. This would add overhead in 865 * Bundle operations. 866 */ 867 private Bitmap mOriginalArtwork; 868 /** 869 * Cache for the transport control mask. 870 * Access synchronized on mCacheLock 871 */ 872 private int mTransportControlFlags = FLAGS_KEY_MEDIA_NONE; 873 /** 874 * Cache for the metadata strings. 875 * Access synchronized on mCacheLock 876 * This is re-initialized in apply() and so cannot be final. 877 */ 878 private Bundle mMetadata = new Bundle(); 879 /** 880 * Listener registered by user of RemoteControlClient to receive requests for playback position 881 * update requests. 882 */ 883 private OnPlaybackPositionUpdateListener mPositionUpdateListener; 884 /** 885 * Provider registered by user of RemoteControlClient to provide the current playback position. 886 */ 887 private OnGetPlaybackPositionListener mPositionProvider; 888 /** 889 * Listener registered by user of RemoteControlClient to receive edit changes to metadata 890 * it exposes. 891 */ 892 private OnMetadataUpdateListener mMetadataUpdateListener; 893 /** 894 * The current remote control client generation ID across the system, as known by this object 895 */ 896 private int mCurrentClientGenId = -1; 897 898 /** 899 * The media button intent description associated with this remote control client 900 * (can / should include target component for intent handling, used when persisting media 901 * button event receiver across reboots). 902 */ 903 private final PendingIntent mRcMediaIntent; 904 905 /** 906 * Reflects whether any "plugged in" IRemoteControlDisplay has mWantsPositonSync set to true. 907 */ 908 // TODO consider using a ref count for IRemoteControlDisplay requiring sync instead 909 private boolean mNeedsPositionSync = false; 910 911 /** 912 * Cache for the current playback state using Session APIs. 913 */ 914 private PlaybackState mSessionPlaybackState = null; 915 916 /** 917 * Cache for metadata using Session APIs. This is re-initialized in apply(). 918 */ 919 private MediaMetadata mMediaMetadata; 920 921 /** 922 * @hide 923 * Accessor to media button intent description (includes target component) 924 */ 925 public PendingIntent getRcMediaIntent() { 926 return mRcMediaIntent; 927 } 928 929 /** 930 * @hide 931 * Default value for the unique identifier 932 */ 933 public final static int RCSE_ID_UNREGISTERED = -1; 934 935 // USE_SESSIONS 936 private MediaSession.Callback mTransportListener = new MediaSession.Callback() { 937 938 @Override 939 public void onSeekTo(long pos) { 940 RemoteControlClient.this.onSeekTo(mCurrentClientGenId, pos); 941 } 942 943 @Override 944 public void onSetRating(Rating rating) { 945 if ((mTransportControlFlags & FLAG_KEY_MEDIA_RATING) != 0) { 946 onUpdateMetadata(mCurrentClientGenId, MetadataEditor.RATING_KEY_BY_USER, rating); 947 } 948 } 949 }; 950 951 //=========================================================== 952 // Message handlers 953 954 private void onSeekTo(int generationId, long timeMs) { 955 synchronized (mCacheLock) { 956 if ((mCurrentClientGenId == generationId) && (mPositionUpdateListener != null)) { 957 mPositionUpdateListener.onPlaybackPositionUpdate(timeMs); 958 } 959 } 960 } 961 962 private void onUpdateMetadata(int generationId, int key, Object value) { 963 synchronized (mCacheLock) { 964 if ((mCurrentClientGenId == generationId) && (mMetadataUpdateListener != null)) { 965 mMetadataUpdateListener.onMetadataUpdate(key, value); 966 } 967 } 968 } 969 970 //=========================================================== 971 // Internal utilities 972 973 /** 974 * Returns whether, for the given playback state, the playback position is expected to 975 * be changing. 976 * @param playstate the playback state to evaluate 977 * @return true during any form of playback, false if it's not playing anything while in this 978 * playback state 979 */ 980 static boolean playbackPositionShouldMove(int playstate) { 981 switch(playstate) { 982 case PLAYSTATE_STOPPED: 983 case PLAYSTATE_PAUSED: 984 case PLAYSTATE_BUFFERING: 985 case PLAYSTATE_ERROR: 986 case PLAYSTATE_SKIPPING_FORWARDS: 987 case PLAYSTATE_SKIPPING_BACKWARDS: 988 return false; 989 case PLAYSTATE_PLAYING: 990 case PLAYSTATE_FAST_FORWARDING: 991 case PLAYSTATE_REWINDING: 992 default: 993 return true; 994 } 995 } 996 997 /** 998 * Period for playback position drift checks, 15s when playing at 1x or slower. 999 */ 1000 private final static long POSITION_REFRESH_PERIOD_PLAYING_MS = 15000; 1001 /** 1002 * Minimum period for playback position drift checks, never more often when every 2s, when 1003 * fast forwarding or rewinding. 1004 */ 1005 private final static long POSITION_REFRESH_PERIOD_MIN_MS = 2000; 1006 /** 1007 * The value above which the difference between client-reported playback position and 1008 * estimated position is considered a drift. 1009 */ 1010 private final static long POSITION_DRIFT_MAX_MS = 500; 1011 /** 1012 * Compute the period at which the estimated playback position should be compared against the 1013 * actual playback position. Is a funciton of playback speed. 1014 * @param speed 1.0f is normal playback speed 1015 * @return the period in ms 1016 */ 1017 private static long getCheckPeriodFromSpeed(float speed) { 1018 if (Math.abs(speed) <= 1.0f) { 1019 return POSITION_REFRESH_PERIOD_PLAYING_MS; 1020 } else { 1021 return Math.max((long)(POSITION_REFRESH_PERIOD_PLAYING_MS / Math.abs(speed)), 1022 POSITION_REFRESH_PERIOD_MIN_MS); 1023 } 1024 } 1025 } 1026
