Initial commit of MediaPlayerWrapper (fc6a4b80) · Commits · e / os / android_packages_modules_Bluetooth

android/app/src/com/android/bluetooth/newavrcp/MediaPlayerWrapper.java

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		/*
		* Copyright 2017 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package com.android.bluetooth.avrcp;

		import android.media.MediaDescription;
		import android.media.MediaMetadata;
		import android.media.session.MediaSession;
		import android.media.session.PlaybackState;
		import android.os.Bundle;
		import android.os.Handler;
		import android.os.Looper;
		import android.os.Message;
		import android.support.annotation.GuardedBy;
		import android.support.annotation.VisibleForTesting;
		import android.util.Log;

		import java.util.List;
		import java.util.Objects;

		/*
		* A class to synchronize Media Controller Callbacks and only pass through
		* an update once all the relevant information is current.
		*/
		class MediaPlayerWrapper {
		private static final String TAG = "NewAvrcpMediaPlayerWrapper";
		private static final boolean DEBUG = true;
		static boolean sTesting = false;

		private MediaController mMediaController;
		private String mPackageName;
		private Looper mLooper;

		private boolean mIsBrowsable = false;
		private MediaData mCurrentData;

		@GuardedBy("mCallbackLock")
		private MediaControllerListener mControllerCallbacks = null;
		private final Object mCallbackLock = new Object();
		private Callback mRegisteredCallback = null;


		protected MediaPlayerWrapper() {
		mCurrentData = new MediaData(null, null, null);
		}

		interface Callback {
		void mediaUpdatedCallback(MediaData data);
		}

		class MediaData {
		public List<MediaSession.QueueItem> queue;
		public PlaybackState state;
		public MediaMetadata metadata;

		MediaData(MediaMetadata m, PlaybackState s, List<MediaSession.QueueItem> q) {
		metadata = m;
		state = s;
		queue = q;
		}

		@Override
		public boolean equals(Object o) {
		if (o == null) return false;
		if (!(o instanceof MediaData)) return false;

		final MediaData u = (MediaData) o;

		if (!Objects.equals(metadata, u.metadata)) {
		return false;
		}

		if (!Objects.equals(queue, u.queue)) {
		return false;
		}

		if (!playstateEquals(state, u.state)) {
		return false;
		}

		return true;
		}
		}

		static MediaPlayerWrapper wrap(MediaController controller, Looper looper, boolean browsable) {
		if (controller == null \|\| looper == null) {
		e("MediaPlayerWrapper.wrap(): Null parameter - Controller: " + controller
		+ " \| Looper: " + looper);
		return null;
		}

		MediaPlayerWrapper newWrapper;
		newWrapper = new MediaPlayerWrapper();

		newWrapper.mMediaController = controller;
		newWrapper.mPackageName = controller.getPackageName();
		newWrapper.mLooper = looper;
		newWrapper.mIsBrowsable = browsable;

		newWrapper.mCurrentData.queue = newWrapper.getQueue();
		newWrapper.mCurrentData.metadata = newWrapper.getMetadata();
		newWrapper.mCurrentData.state = newWrapper.getPlaybackState();

		return newWrapper;
		}

		void cleanup() {
		unregisterCallback();

		mMediaController = null;
		mLooper = null;
		}

		boolean isBrowsable() {
		return mIsBrowsable;
		}

		String getPackageName() {
		return mPackageName;
		}

		List<MediaSession.QueueItem> getQueue() {
		if (!isBrowsable()) return null;

		return mMediaController.getQueue();
		}

		MediaMetadata getMetadata() {
		return mMediaController.getMetadata();
		}

		long getActiveQueueID() {
		if (mMediaController.getPlaybackState() == null) return -1;
		return mMediaController.getPlaybackState().getActiveQueueItemId();
		}

		PlaybackState getPlaybackState() {
		return mMediaController.getPlaybackState();
		}

		// TODO: Implement shuffle and repeat support. Right now these use custom actions
		// and it may only be possible to do this with Google Play Music
		boolean isShuffleSupported() {
		return false;
		}

		boolean isRepeatSupported() {
		return false;
		}

		void toggleShuffle(boolean on) {
		return;
		}

		void toggleRepeat(boolean on) {
		return;
		}

		/**
		* Return whether the queue, metadata, and queueID are all in sync. If
		* browsing isn't supported we don't have to worry about the queue as
		* the queue doesn't exist
		*/
		boolean isMetadataSynced() {
		if (isBrowsable()) {
		// Check if currentPlayingQueueId is in the current Queue
		MediaSession.QueueItem currItem = null;

		for (MediaSession.QueueItem item : getQueue()) {
		if (item.getQueueId()
		== getActiveQueueID()) { // The item exists in the current queue
		currItem = item;
		break;
		}
		}

		// Check if current playing song in Queue matches current Metadata
		if (currItem == null
		\|\| !currItem.getDescription().equals(getMetadata().getDescription())) {
		if (DEBUG) {
		Log.d(TAG, "Metadata currently out of sync for " + mPackageName);
		Log.d(TAG, " └ Current queueItem: " + currItem);
		Log.d(TAG, " └ Current metadata : " + getMetadata().getDescription());
		}
		return false;
		}
		}

		return true;
		}

		/**
		* Register a callback which gets called when media updates happen. The callbacks are
		* called on the same Looper that was passed in to create this object.
		*/
		void registerCallback(Callback callback) {
		if (callback == null) {
		e("Cannot register null callbacks for " + mPackageName);
		return;
		}

		synchronized (mCallbackLock) {
		mRegisteredCallback = callback;
		}
		mControllerCallbacks = new MediaControllerListener(mLooper);
		}

		/**
		* Unregisters from updates. Note, this doesn't require the looper to be shut down.
		*/
		void unregisterCallback() {
		// Prevent a race condition where a callback could be called while shutting down
		synchronized (mCallbackLock) {
		mRegisteredCallback = null;
		}

		if (mControllerCallbacks == null) return;
		mControllerCallbacks.cleanup();
		mControllerCallbacks = null;
		}

		class TimeoutHandler extends Handler {
		private static final int MSG_TIMEOUT = 0;
		private static final long CALLBACK_TIMEOUT_MS = 1000;

		TimeoutHandler(Looper looper) {
		super(looper);
		}

		@Override
		public void handleMessage(Message msg) {
		if (msg.what != MSG_TIMEOUT) {
		Log.wtf(TAG, "Unknown message on timeout handler: " + msg.what);
		return;
		}

		Log.e(TAG, "Timeout while waiting for metadata to sync for " + mPackageName);
		Log.e(TAG, " └ Current Metadata: " + getMetadata().getDescription());
		Log.e(TAG, " └ Current Playstate: " + getPlaybackState());
		for (int i = 0; i < getQueue().size(); i++) {
		Log.e(TAG, " └ QueueItem(" + i + "): " + getQueue().get(i));
		}

		// TODO(apanicke): Add metric collection here.

		if (sTesting) Log.wtfStack(TAG, "Crashing the stack");
		}
		}

		class MediaControllerListener extends MediaController.Callback {
		private final Object mTimeoutHandlerLock = new Object();
		private Handler mTimeoutHandler;

		MediaControllerListener(Looper newLooper) {
		synchronized (mTimeoutHandlerLock) {
		mTimeoutHandler = new TimeoutHandler(newLooper);

		// Register the callbacks to execute on the same thread as the timeout thread. This
		// prevents a race condition where a timeout happens at the same time as an update.
		mMediaController.registerCallback(this, mTimeoutHandler);
		}
		}

		void cleanup() {
		synchronized (mTimeoutHandlerLock) {
		mMediaController.unregisterCallback(this);
		mTimeoutHandler.removeMessages(TimeoutHandler.MSG_TIMEOUT);
		mTimeoutHandler = null;
		}
		}

		void trySendMediaUpdate() {
		synchronized (mTimeoutHandlerLock) {
		if (mTimeoutHandler == null) return;
		mTimeoutHandler.removeMessages(TimeoutHandler.MSG_TIMEOUT);

		if (!isMetadataSynced()) {
		if (DEBUG) {
		Log.d(TAG, "trySendMediaUpdate(): " + mPackageName
		+ ": Starting media update timeout");
		}
		mTimeoutHandler.sendEmptyMessageDelayed(TimeoutHandler.MSG_TIMEOUT,
		TimeoutHandler.CALLBACK_TIMEOUT_MS);
		return;
		}
		}

		MediaData newData = new MediaData(getMetadata(), getPlaybackState(), getQueue());

		if (newData.equals(mCurrentData)) {
		// This may happen if the controller is fully synced by the time the
		// first update is completed
		Log.v(TAG, "Trying to update with last sent metadata");
		return;
		}

		synchronized (mCallbackLock) {
		if (mRegisteredCallback == null) {
		Log.e(TAG, mPackageName
		+ "Trying to send an update with no registered callback");
		return;
		}

		Log.v(TAG, "trySendMediaUpdate(): Metadata has been updated for " + mPackageName);
		mRegisteredCallback.mediaUpdatedCallback(newData);
		}

		mCurrentData = newData;
		}

		@Override
		public void onMetadataChanged(MediaMetadata metadata) {
		Log.v(TAG, "onMetadataChanged(): " + mPackageName + " : " + metadata.getDescription());

		if (!metadata.equals(getMetadata())) {
		e("The callback metadata doesn't match controller metadata");
		}

		// TODO: Certain players update different metadata fields as they load, such as Album
		// Art. For track changed updates we only care about the song information like title
		// and album and duration. In the future we can use this to know when Album art is
		// loaded.

		// TODO: Spotify needs a metadata update debouncer as it sometimes updates the metadata
		// twice in a row with the only difference being that the song duration is rounded to
		// the nearest second.
		if (metadata.equals(mCurrentData.metadata)) {
		Log.w(TAG, "onMetadataChanged(): " + mPackageName
		+ " tried to update with no new data");
		return;
		}

		trySendMediaUpdate();
		}

		@Override
		public void onPlaybackStateChanged(PlaybackState state) {
		Log.v(TAG, "onPlaybackStateChanged(): " + mPackageName + " : " + state.toString());

		if (!playstateEquals(state, getPlaybackState())) {
		e("The callback playback state doesn't match the current state");
		}

		if (playstateEquals(state, mCurrentData.state)) {
		Log.w(TAG, "onPlaybackStateChanged(): " + mPackageName
		+ " tried to update with no new data");
		return;
		}

		// If there is no playstate, ignore the update.
		if (state.getState() == PlaybackState.STATE_NONE) {
		Log.v(TAG, "Waiting to send update as controller has no playback state");
		return;
		}

		trySendMediaUpdate();
		}

		@Override
		public void onQueueChanged(List<MediaSession.QueueItem> queue) {
		Log.v(TAG, "onQueueChanged(): " + mPackageName);
		if (!isBrowsable()) {
		e("Queue changed for non-browsable player " + mPackageName);
		return;
		}
		if (!queue.equals(getQueue())) {
		e("The callback queue isn't the current queue");
		}
		if (queue.equals(mCurrentData.queue)) {
		Log.w(TAG, "onQueueChanged(): " + mPackageName
		+ " tried to update with no new data");
		return;
		}

		if (DEBUG) {
		for (int i = 0; i < queue.size(); i++) {
		Log.d(TAG, " └ QueueItem(" + i + "): " + queue.get(i));
		}
		}

		trySendMediaUpdate();
		}

		@Override
		public void onSessionDestroyed() {}

		@VisibleForTesting
		Handler getTimeoutHandler() {
		return mTimeoutHandler;
		}
		}

		/**
		* Checks wheter the core information of two PlaybackStates match. This function allows a
		* certain amount of deviation between the position fields of the PlaybackStates. This is to
		* prevent matches from failing when updates happen in quick succession.
		*
		* The maximum allowed deviation is defined by PLAYSTATE_BOUNCE_IGNORE_PERIOD and is measured
		* in milliseconds.
		*/
		private static final long PLAYSTATE_BOUNCE_IGNORE_PERIOD = 500;
		static boolean playstateEquals(PlaybackState a, PlaybackState b) {
		if (a == b) return true;

		if (a != null && b != null
		&& a.getState() == b.getState()
		&& a.getActiveQueueItemId() == b.getActiveQueueItemId()
		&& Math.abs(a.getPosition() - b.getPosition()) < PLAYSTATE_BOUNCE_IGNORE_PERIOD) {
		return true;
		}

		return false;
		}

		/**
		* Extracts different pieces of metadata from a MediaSession.QueueItem
		* and builds a MediaMetadata Object out of it.
		*/
		MediaMetadata queueItemToMetadata(MediaSession.QueueItem item) {
		final String[] metadataStringKeys = {
		MediaMetadata.METADATA_KEY_TITLE,
		MediaMetadata.METADATA_KEY_ARTIST,
		MediaMetadata.METADATA_KEY_ALBUM,
		MediaMetadata.METADATA_KEY_GENRE };

		MediaMetadata.Builder newMetadata = new MediaMetadata.Builder();
		MediaDescription description = item.getDescription();
		Bundle extras = description.getExtras();

		for (String key : metadataStringKeys) {
		String value = extras.getString(key);

		if (key == MediaMetadata.METADATA_KEY_TITLE && value == null) {
		value = description.getTitle().toString();
		}

		if (value == null) {
		if (DEBUG) {
		Log.d(TAG, "queueItemToMetadata: " + description + " is missing key: " + key);
		}
		continue;
		}
		newMetadata.putString(key, value);
		}

		long duration = extras.getLong(MediaMetadata.METADATA_KEY_DURATION);
		newMetadata.putLong(MediaMetadata.METADATA_KEY_DURATION, duration);

		return newMetadata.build();
		}

		private static void e(String message) {
		if (sTesting) {
		Log.wtfStack(TAG, message);
		} else {
		Log.e(TAG, message);
		}
		}

		@VisibleForTesting
		Handler getTimeoutHandler() {
		if (mControllerCallbacks == null) return null;
		return mControllerCallbacks.getTimeoutHandler();
		}
		}

android/app/tests/unit/src/com/android/bluetooth/newavrcp/MediaPlayerWrapperTest.java

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