Merge "Added documentation on AVRCP MediaPlayerList." into main am: 1e8cc90a33 am: 8f40085295 (083516a4) · Commits · e / os / android_packages_modules_Bluetooth

android/app/src/com/android/bluetooth/audio_util/MediaPlayerList.java

+194 −8

Original line number	Diff line number	Diff line
		@@ -161,6 +161,14 @@ public class MediaPlayerList {
		mContext.getMainExecutor(), mMediaKeyEventSessionChangedListener);
		}

		/**
		* Retrieves the list of active {@link android.media.session.MediaController}, convert them to
		* local {@link MediaController}, converts them again to {@link MediaPlayerWrapper} and add them
		* to the local list ({@link #mMediaPlayers}).
		*
		* <p>If we already received an onActiveSessionsChanged callback, set this player as active,
		* otherwise set the highest priority one as active (first in the list).
		*/
		private void constructCurrentPlayers() {
		// Construct the list of current players
		d("Initializing list of current media players");
		@@ -191,6 +199,7 @@ public class MediaPlayerList {
		}
		}

		/** Initiates browsable players and calls {@link #constructCurrentPlayers}. */
		public void init(MediaUpdateCallback callback) {
		Log.v(TAG, "Initializing MediaPlayerList");
		mCallback = callback;
		@@ -278,10 +287,16 @@ public class MediaPlayerList {
		mBrowsablePlayers.clear();
		}

		/**
		* Current player ID is always Bluetooth player ID.
		*
		* <p>All browsable players are subdirectories of Bluetooth player.
		*/
		public int getCurrentPlayerId() {
		return BLUETOOTH_PLAYER_ID;
		}

		/** Get the next ID available in the IDs map. */
		int getFreeMediaPlayerId() {
		int id = 1;
		while (mMediaPlayerIds.containsValue(id)) {
		@@ -290,12 +305,21 @@ public class MediaPlayerList {
		return id;
		}

		/** Returns the {@link #MediaPlayerWrapper} with ID matching {@link #mActivePlayerId}. */
		public MediaPlayerWrapper getActivePlayer() {
		return mMediaPlayers.get(mActivePlayerId);
		}

		// In this case the displayed player is the Bluetooth Player, the number of items is equal
		// to the number of players. The root ID will always be empty string in this case as well.
		/**
		* This is used by setBrowsedPlayer as the browsed player is always the Bluetooth player.
		*
		* <p>If the requested player ID is not {@link #BLUETOOTH_PLAYER_ID}, success will be false.
		*
		* <p>The number of items will be the number of browsable players as they all are direct
		* subdirectories of the Bluetooth player ID.
		*
		* <p>The root ID will always be an empty string to correspond to bluetooth player ID.
		*/
		public void getPlayerRoot(int playerId, GetPlayerRootCallback cb) {
		/** M: Fix PTS AVRCP/TG/MCN/CB/BI-02-C fail @{ */
		if (Utils.isPtsTestMode()) {
		@@ -316,7 +340,11 @@ public class MediaPlayerList {
		cb.run(playerId, playerId == BLUETOOTH_PLAYER_ID, "", mBrowsablePlayers.size());
		}

		// Return the "Bluetooth Player" as the only player always
		/**
		* Returns a list containing only the Bluetooth player.
		*
		* <p>See class documentation.
		*/
		public List<PlayerInfo> getMediaPlayerList() {
		PlayerInfo info = new PlayerInfo();
		info.id = BLUETOOTH_PLAYER_ID;
		@@ -332,6 +360,12 @@ public class MediaPlayerList {
		return ret;
		}

		/**
		* Returns the active queue item id of the active player.
		*
		* <p>If the player's queue is empty, if the active queue item id is unknown or if the {@link
		* android.media.session.PlaybackState} is null, returns an empty string.
		*/
		@NonNull
		public String getCurrentMediaId() {
		final MediaPlayerWrapper player = getActivePlayer();
		@@ -353,6 +387,10 @@ public class MediaPlayerList {
		return Util.NOW_PLAYING_PREFIX + state.getActiveQueueItemId();
		}

		/**
		* Returns the active {@link android.media.session.MediaController}'s metadata, converted to
		* {@link Metadata}.
		*/
		@NonNull
		public Metadata getCurrentSongInfo() {
		final MediaPlayerWrapper player = getActivePlayer();
		@@ -361,6 +399,13 @@ public class MediaPlayerList {
		return player.getCurrentMetadata();
		}

		/**
		* Returns the current playing state of the active player.
		*
		* <p>If {@link #mAudioPlaybackIsActive} is true and the returned state is different from {@link
		* android.media.session.PlaybackState.STATE_PLAYING}, returns a copy of the state with playing
		* state {@link android.media.session.PlaybackState.STATE_PLAYING}.
		*/
		public PlaybackState getCurrentPlayStatus() {
		final MediaPlayerWrapper player = getActivePlayer();
		if (player == null) return null;
		@@ -377,6 +422,13 @@ public class MediaPlayerList {
		return state;
		}

		/**
		* Returns the current queue of the active player.
		*
		* <p>If there is no queue, returns a list containing only the active player's Metadata.
		*
		* <p>See {@link #getCurrentSongInfo} and {@link #getCurrentMediaId}.
		*/
		@NonNull
		public List<Metadata> getNowPlayingList() {
		// Only send the current song for the now playing if there is no active song. See
		@@ -392,6 +444,13 @@ public class MediaPlayerList {
		return getActivePlayer().getCurrentQueue();
		}

		/**
		* Informs Media that there is a new request to play {@code mediaId}.
		*
		* <p>If the {@code nowPlaying} parameter is true, this will try to select the item from the
		* current active player's queue. Otherwise this means that the item is from a browsable player
		* and this calls {@link BrowsedPlayerWrapper} to handle the change.
		*/
		public void playItem(int playerId, boolean nowPlaying, String mediaId) {
		if (nowPlaying) {
		playNowPlayingItem(mediaId);
		@@ -400,6 +459,11 @@ public class MediaPlayerList {
		}
		}

		/**
		* Retrieves the active player and plays item from queue.
		*
		* <p>See {@link #playItem}.
		*/
		private void playNowPlayingItem(String mediaId) {
		d("playNowPlayingItem: mediaId=" + mediaId);

		@@ -417,6 +481,11 @@ public class MediaPlayerList {
		}
		}

		/**
		* Retrieves the {@link BrowsedPlayerWrapper} corresponding to the {@code mediaId} and plays it.
		*
		* <p>See {@link #playItem}.
		*/
		private void playFolderItem(String mediaId) {
		d("playFolderItem: mediaId=" + mediaId);

		@@ -445,6 +514,14 @@ public class MediaPlayerList {
		wrapper.playItem(itemId);
		}

		/**
		* Calls {@code cb} with the list of browsable players as folder items.
		*
		* <p>As browsable players are subdirectories of the root Bluetooth player, the list always
		* contains all the browsable players.
		*
		* <p>See {@link #getFolderItems}.
		*/
		void getFolderItemsMediaPlayerList(GetFolderItemsCallback cb) {
		d("getFolderItemsMediaPlayerList: Sending Media Player list for root directory");

		@@ -462,6 +539,15 @@ public class MediaPlayerList {
		return;
		}

		/**
		* Calls {@code cb} with a list of browsable folders.
		*
		* <p>If {@code mediaId} is empty, {@code cb} will be called with all the browsable players as
		* they are subdirectories of the root Bluetooth player.
		*
		* <p>If {@code mediaId} corresponds to a known {@link BrowsedPlayerWrapper}, {@code cb} will be
		* called with the folder items list of the {@link BrowsedPlayerWrapper}.
		*/
		public void getFolderItems(int playerId, String mediaId, GetFolderItemsCallback cb) {
		// The playerId is unused since we always assume the remote device is using the
		// Bluetooth Player.
		@@ -533,6 +619,16 @@ public class MediaPlayerList {
		}
		}

		/**
		* Adds a {@link MediaController} to the {@link #mMediaPlayers} map and returns its ID.
		*
		* <p>Each {@link MediaController} is mapped to an ID and each ID is mapped to a package name.
		* If the new {@link MediaController}'s package name is already present in {@link
		* #mMediaPlayerIds}, we keep the ID and replace the {@link MediaController}. Otherwise, we add
		* an entry in both {@link #mMediaPlayerIds} and {@link #mMediaPlayers} maps.
		*
		* <p>Also sends the new {@link MediaData} to the AVRCP service.
		*/
		@VisibleForTesting
		int addMediaPlayer(MediaController controller) {
		// Each new player has an ID of 1 plus the highest ID. The ID 0 is reserved to signify that
		@@ -572,9 +668,12 @@ public class MediaPlayerList {
		return playerId;
		}

		// Adds the controller to the MediaPlayerList or updates the controller if we already had
		// a controller for a package. Returns the new ID of the controller where its added or its
		// previous value if it already existed. Returns -1 if the controller passed in is invalid
		/**
		* Adds a {@link android.media.session.MediaController} to the {@link #mMediaPlayers} map and
		* returns its ID. If the {@link android.media.session.MediaController} is null, returns -1.
		*
		* <p>See {@link #addMediaPlayer(MediaController)}.
		*/
		int addMediaPlayer(android.media.session.MediaController controller) {
		if (controller == null) {
		e("Trying to add a null MediaController");
		@@ -584,25 +683,42 @@ public class MediaPlayerList {
		return addMediaPlayer(MediaControllerFactory.wrap(controller));
		}

		/** Returns true if {@code packageName} is present in {@link #mMediaPlayerIds}. */
		boolean havePlayerId(String packageName) {
		if (packageName == null) return false;
		return mMediaPlayerIds.containsKey(packageName);
		}

		/**
		* Returns true if {@code packageName} is present in {@link #mMediaPlayerIds} and the
		* corresponding ID has a {@link MediaPlayerWrapper} set in {@link #mMediaPlayers}.
		*/
		boolean haveMediaPlayer(String packageName) {
		if (!havePlayerId(packageName)) return false;
		int playerId = mMediaPlayerIds.get(packageName);
		return mMediaPlayers.containsKey(playerId);
		}

		/** Returns true if {@code playerId} is present in {@link #mMediaPlayers}. */
		boolean haveMediaPlayer(int playerId) {
		return mMediaPlayers.containsKey(playerId);
		}

		/** Returns true if {@code playerId} is present in {@link #mBrowsablePlayers}. */
		boolean haveMediaBrowser(int playerId) {
		return mBrowsablePlayers.containsKey(playerId);
		}

		/**
		* Removes the entry corresponding to {@code playerId} from {@link #mMediaPlayers} and {@link
		* #mMediaPlayerIds}.
		*
		* <p>If the removed player was the active one, we consider that there is no more active players
		* until we receive a {@link MediaSessionManager.OnActiveSessionsChangedListener} callback
		* saying otherwise.
		*
		* <p>Also sends empty {@link MediaData} to the AVRCP service.
		*/
		void removeMediaPlayer(int playerId) {
		if (!haveMediaPlayer(playerId)) {
		e("Trying to remove nonexistent media player: " + playerId);
		@@ -635,6 +751,12 @@ public class MediaPlayerList {
		wrapper.cleanup();
		}

		/**
		* Sets {@code playerId} as the new active player and sends the new player's {@link Mediadata}
		* to the AVRCP service.
		*
		* <p>Also informs the {@link #PlayerSettingsManager} about the change of active player.
		*/
		void setActivePlayer(int playerId) {
		if (!haveMediaPlayer(playerId)) {
		e("Player doesn't exist in list(): " + playerId);
		@@ -675,6 +797,7 @@ public class MediaPlayerList {
		sendMediaUpdate(data);
		}

		/** Informs AVRCP service that there has been an update in browsable players. */
		private void sendFolderUpdate(boolean availablePlayers, boolean addressedPlayers,
		boolean uids) {
		d("sendFolderUpdate");
		@@ -685,6 +808,7 @@ public class MediaPlayerList {
		mCallback.run(availablePlayers, addressedPlayers, uids);
		}

		/** Indicates that there have been a {@link MediaData} update for the current active player. */
		private void sendMediaUpdate(MediaData data) {
		d("sendMediaUpdate");
		if (mCallback == null \|\| data == null) {
		@@ -702,6 +826,19 @@ public class MediaPlayerList {
		mCallback.run(data);
		}

		/**
		* Callback from Media Framework to indicate that the active session changed.
		*
		* <p>As sessions can have multiple {@link android.media.session.MediaController}, we add all
		* the new players, keeping only the highest priority {@link
		* android.media.session.MediaController} per package name (priority is defined by order in the
		* list).
		*
		* <p>Note: This does not set the current active player, only adds the new {@link
		* MediaController} to the {@link #mMediaPlayerIds} and {@link mMediaPlayers} maps.
		*
		* <p>See {@link #onMediaKeyEventSessionChanged}.
		*/
		@VisibleForTesting
		final MediaSessionManager.OnActiveSessionsChangedListener
		mActiveSessionsChangedListener =
		@@ -747,7 +884,19 @@ public class MediaPlayerList {
		}
		};

		// TODO (apanicke): Write a test that tests uninstalling the active session
		/**
		* {@link android.content.BroadcastReceiver} to catch intents indicating package add, change and
		* removal.
		*
		* <p>If a package is removed while its corresponding {@link MediaPlayerWrapper} is present in
		* the {@link #mMediaPlayerIds} and {@link mMediaPlayers} maps, remove it.
		*
		* <p>If a package is added or changed, currently nothing is done. Ideally, this should add it
		* to the {@link #mMediaPlayerIds} and {@link mMediaPlayers} maps.
		*
		* <p>See {@link #removeMediaPlayer} and {@link
		* #addMediaPlayer(android.media.session.MediaController)}
		*/
		private final BroadcastReceiver mPackageChangedBroadcastReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
		@@ -775,6 +924,12 @@ public class MediaPlayerList {
		}
		};

		/**
		* Retrieves and sends the current {@link MediaData} of the active player (if present) to the
		* AVRCP service or if there is no active player, sends an empty {@link MediaData}.
		*
		* <p>See {@link #sendMediaUpdate}.
		*/
		void updateMediaForAudioPlayback() {
		MediaData currMediaData = null;
		PlaybackState currState = null;
		@@ -812,16 +967,24 @@ public class MediaPlayerList {
		sendMediaUpdate(currMediaData);
		}

		/** For testing purposes only, sets the {@link #mAudioPlaybackIsActive} flag. */
		@VisibleForTesting
		void injectAudioPlaybacActive(boolean isActive) {
		mAudioPlaybackIsActive = isActive;
		updateMediaForAudioPlayback();
		}

		/**
		* Saves the reference to {@link MediaPlayerSettingsEventListener} to be called when the active
		* player changed, so that {@link #PlayerSettingsManager} always has the right player.
		*/
		void setPlayerSettingsCallback(MediaPlayerSettingsEventListener listener) {
		mPlayerSettingsListener = listener;
		}

		/**
		* Listens to playback configurations changes, to set the {@link #mAudioPlaybackIsActive} flag.
		*/
		private final AudioManager.AudioPlaybackCallback mAudioPlaybackCallback =
		new AudioManager.AudioPlaybackCallback() {
		@Override
		@@ -854,6 +1017,14 @@ public class MediaPlayerList {
		}
		};

		/**
		* Callback from {@link MediaPlayerWrapper}.
		*
		* <p>{@link #mediaUpdatedCallback} listens for {@link #MediaData} changes on the active player.
		*
		* <p>{@link #sessionUpdatedCallback} is called when the active session is destroyed so we need
		* to remove the media player from the {@link #mMediaPlayerIds} and {@link mMediaPlayers} maps.
		*/
		private final MediaPlayerWrapper.Callback mMediaPlayerCallback =
		new MediaPlayerWrapper.Callback() {
		@Override
		@@ -884,6 +1055,21 @@ public class MediaPlayerList {
		}
		};

		/**
		* Listens for Media key events session changes.
		*
		* <p>The Media session that listens to key events is considered the active session.
		*
		* <p>This will retrieve the {@link android.media.session.MediaController} for this session with
		* the {@code token} provided and set it as the active one.
		*
		* <p>If the {@link android.media.session.MediaController} flags include the {@link
		* MediaSession.FLAG_EXCLUSIVE_GLOBAL_PRIORITY}, the session change shall be ignored as this
		* flag is used only by Telecom to handle wired headsets key events.
		*
		* <p>It can happen that {@code token} is null, in such case wecan still check if we have a
		* {@link MediaController} corresponding to {@code packageName} and set it as active.
		*/
		@VisibleForTesting
		final MediaSessionManager.OnMediaKeyEventSessionChangedListener
		mMediaKeyEventSessionChangedListener =
		@@ -933,7 +1119,7 @@ public class MediaPlayerList {
		}
		};


		/** Dumps all players and browsable players currently listed in this class. */
		public void dump(StringBuilder sb) {
		sb.append("List of MediaControllers: size=" + mMediaPlayers.size() + "\n");
		for (int id : mMediaPlayers.keySet()) {