Upstream Chrome for Android Cast.

chrome/android/java/src/org/chromium/chrome/browser/media/remote/RemoteMediaPlayerController.java

Index: chrome/android/java/src/org/chromium/chrome/browser/media/remote/RemoteMediaPlayerController.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/remote/RemoteMediaPlayerController.java b/chrome/android/java/src/org/chromium/chrome/browser/media/remote/RemoteMediaPlayerController.java
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@@ -0,0 +1,439 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.media.remote;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.graphics.Bitmap;
+import android.os.Bundle;
+import android.support.v4.app.FragmentActivity;
+import android.support.v4.app.FragmentManager;
+import android.support.v7.app.MediaRouteChooserDialogFragment;
+import android.support.v7.app.MediaRouteControllerDialogFragment;
+import android.support.v7.app.MediaRouteDialogFactory;
+import android.util.Log;
+import android.widget.Toast;
+
+import com.google.android.gms.cast.CastMediaControlIntent;
+
+import org.chromium.base.ApplicationStatus;
+import org.chromium.base.CommandLine;
+import org.chromium.base.ThreadUtils;
+import org.chromium.base.VisibleForTesting;
+import org.chromium.chrome.ChromeSwitches;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.media.remote.RemoteVideoInfo.PlayerState;
+
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * The singleton responsible managing the global resources for remote media playback (cast)
+ */
+public class RemoteMediaPlayerController implements MediaRouteController.UiListener {
+    // Singleton instance of the class. May only be accessed from UI thread.
+    private static RemoteMediaPlayerController sInstance;
+
+    private static final String TAG = "VideoFling";
+
+    private static final String DEFAULT_CASTING_MESSAGE = "Casting to Chromecast";
+
+    private TransportControl mNotificationControl;
+    private TransportControl mLockScreenControl;
+
+    private Context mCastContextApplicationContext;
+    // The Activity that was in the foreground when the video was cast.
+    private WeakReference<Activity> mChromeVideoActivity;
+
+    private List<MediaRouteController> mMediaRouteControllers;
+
+    // points to mDefaultRouteSelector, mYouTubeRouteSelector or null
+    private MediaRouteController mCurrentRouteController;
+
+    private boolean mFirstConnection = true;
+
+    // This is a key for meta-data in the package manifest.
+    private static final String REMOTE_MEDIA_PLAYERS_KEY =
+            "org.chromium.content.browser.REMOTE_MEDIA_PLAYERS";
+
+    /**
+     * The private constructor to make sure the object is only created by the instance() method.
+     */
+    private RemoteMediaPlayerController() {
+        mChromeVideoActivity = new WeakReference<Activity>(null);
+        mMediaRouteControllers = new ArrayList<MediaRouteController>();
+    }
+
+    /**
+     * @return Whether the remote playback is enabled.
+     */
+    public static boolean isRemotePlaybackEnabled() {
+        return !CommandLine.getInstance().hasSwitch(ChromeSwitches.DISABLE_CAST);
+    }
+
+    /**
+     * @return The poster image for the currently playing remote video, null if there's none.
+     */
+    public Bitmap getPoster() {
+        if (mCurrentRouteController == null) return null;
+        return mCurrentRouteController.getPoster();
+    }
+
+    /**
+     * The singleton instance access method for native objects. Must be called on the UI thread
+     * only.
+     */
+    public static RemoteMediaPlayerController instance() {
+        ThreadUtils.assertOnUiThread();
+
+        if (sInstance == null) sInstance = new RemoteMediaPlayerController();
+        if (sInstance.mChromeVideoActivity.get() == null) sInstance.linkToBrowserActivity();
+
+        return sInstance;
+    }
+
+    /**
+     * Gets the MediaRouteController for a video, creating it if necessary.
+     * @param frameUrl The Url of the frame containing the video
+     * @return the MediaRouteController, or null if none.
+     */
+    public MediaRouteController getMediaRouteController(String sourceUrl, String frameUrl) {
+        for (MediaRouteController controller: mMediaRouteControllers) {
+            if (controller.canPlayMedia(sourceUrl, frameUrl)) {
+                return controller;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Gets the default MediaRouteController, creating it if necessary.
+     * @return the default MediaRouteController.
+     */
+    public List<MediaRouteController> getMediaRouteControllers() {
+        return mMediaRouteControllers;
+    }
+
+    /**
+     * Links this object to the Activity that owns the video, if it exists.
+     *
+     */
+    private void linkToBrowserActivity() {
+
+        Activity currentActivity = ApplicationStatus.getLastTrackedFocusedActivity();
+        if (currentActivity != null) {
+            mChromeVideoActivity = new WeakReference<Activity>(currentActivity);
+
+            mCastContextApplicationContext = currentActivity.getApplicationContext();
+            createMediaRouteControllers(currentActivity);
+        }
+    }
+
+    public void createMediaRouteControllers(Context context) {
+        // We only need to do this once
+        if (!mMediaRouteControllers.isEmpty()) return;
+        try {
+            ApplicationInfo ai = context.getPackageManager().getApplicationInfo(
+                    context.getPackageName(), PackageManager.GET_META_DATA);
+            Bundle bundle = ai.metaData;
+            String classNameString = bundle.getString(REMOTE_MEDIA_PLAYERS_KEY);
+
+            if (classNameString != null) {
+                String[] classNames = classNameString.split(",");
+                for (String className : classNames) {
+                    Log.i(TAG, "Adding remote media route controller " + className.trim());
+                    Class<?> mediaRouteControllerClass = Class.forName(className.trim());
+                    Object mediaRouteController = mediaRouteControllerClass.newInstance();
+                    assert mediaRouteController instanceof MediaRouteController;
+                    mMediaRouteControllers.add((MediaRouteController) mediaRouteController);
+                }
+            }
+        } catch (NameNotFoundException | ClassNotFoundException | SecurityException
+                | InstantiationException | IllegalAccessException | IllegalArgumentException e) {
+            // Should never happen, implies corrupt AndroidManifest
+            Log.e(TAG, "Couldn't instatiate MediaRouteControllers", e);
+            assert false;
+        }
+    }
+
+    private void onStateReset(MediaRouteController controller) {
+
+        if (!controller.initialize()) return;
+
+        if (mFirstConnection) {
+            controller.reconnectAnyExistingRoute();
+            mFirstConnection = false;
+        }
+
+        if (mNotificationControl != null) {
+            mNotificationControl.setRouteController(controller);
+        }
+        if (mLockScreenControl != null) {
+            mLockScreenControl.setRouteController(controller);
+        }
+        controller.prepareMediaRoute();
+
+        controller.addUiListener(this);
+    }
+
+    /**
+     * Called when a lower layer requests that a video be cast. This will typically be a request
+     * from Blink when the cast button is pressed on the default video controls.
+     * @param player the player for which cast is being requested
+     * @param frameUrl the URL of the frame containing the video, needed for YouTube videos
+     */
+    public void requestRemotePlayback(
+            MediaRouteController.MediaStateListener player, MediaRouteController controller) {
+        Activity currentActivity = ApplicationStatus.getLastTrackedFocusedActivity();
+        mChromeVideoActivity = new WeakReference<Activity>(currentActivity);
+
+        if (mCurrentRouteController != null && controller != mCurrentRouteController) {
+            mCurrentRouteController.release();
+        }
+
+        onStateReset(controller);
+        if (controller.shouldResetState(player)) {
+            controller.setMediaStateListener(player);
+            showMediaRouteDialog(controller, currentActivity);
+        }
+
+    }
+
+    /**
+     * Called when a lower layer requests control of a video that is being cast.
+     * @param player The player for which remote playback control is being requested.
+     */
+    public void requestRemotePlaybackControl(MediaRouteController.MediaStateListener player) {
+        // Player should match currently remotely played item, but there
+        // can be a race between various
+        // ways that the a video can stop playing remotely. Check that the
+        // player is current, and ignore if not.
+
+        if (mCurrentRouteController == null) return;
+        if (mCurrentRouteController.getMediaStateListener() != player) return;
+
+        showMediaRouteControlDialog(mCurrentRouteController,
+                ApplicationStatus.getLastTrackedFocusedActivity());
+    }
+
+    private void showMediaRouteDialog(MediaRouteController controller, Activity activity) {
+
+        FragmentManager fm = ((FragmentActivity) activity).getSupportFragmentManager();
+        if (fm == null) {
+            throw new IllegalStateException("The activity must be a subclass of FragmentActivity");
+        }
+
+        MediaRouteDialogFactory factory = new ChromeMediaRouteDialogFactory();
+
+        if (fm.findFragmentByTag(
+                "android.support.v7.mediarouter:MediaRouteChooserDialogFragment") != null) {
+            Log.w(TAG, "showDialog(): Route chooser dialog already showing!");
+            return;
+        }
+        MediaRouteChooserDialogFragment f = factory.onCreateChooserDialogFragment();
+
+        f.setRouteSelector(controller.buildMediaRouteSelector());
+        f.show(fm, "android.support.v7.mediarouter:MediaRouteChooserDialogFragment");
+    }
+
+    private void showMediaRouteControlDialog(MediaRouteController controller, Activity activity) {
+
+        FragmentManager fm = ((FragmentActivity) activity).getSupportFragmentManager();
+        if (fm == null) {
+            throw new IllegalStateException("The activity must be a subclass of FragmentActivity");
+        }
+        MediaRouteDialogFactory factory = new ChromeMediaRouteDialogFactory();
+
+        if (fm.findFragmentByTag(
+                "android.support.v7.mediarouter:MediaRouteControllerDialogFragment") != null) {
+            Log.w(TAG, "showDialog(): Route controller dialog already showing!");
+            return;
+        }
+        MediaRouteControllerDialogFragment f = factory.onCreateControllerDialogFragment();
+
+        f.show(fm, "android.support.v7.mediarouter:MediaRouteControllerDialogFragment");
+    }
+
+     /**
+     * Starts up the notification and lock screen with the given playback state.
+     *
+     * @param initialState the initial state of the notification
+     * @param mediaRouteController the mediaRouteController for which these are needed
+     */
+    public void startNotificationAndLockScreen(PlayerState initialState,
+            MediaRouteController mediaRouteController) {
+        mCurrentRouteController = mediaRouteController;
+        createNotificationControl();
+        getNotification().show(initialState);
+        createLockScreen();
+        TransportControl lockScreen = getLockScreen();
+        if (lockScreen != null) lockScreen.show(initialState);
+    }
+
+    /**
+     * Returns the current remote playback position.
+     *
+     * @return The current position of the remote playback in milliseconds.
+     */
+    public int getPosition() {
+        if (mCurrentRouteController == null) return -1;
+        return mCurrentRouteController.getPosition();
+    }
+
+    /**
+     * @return The stream duration in milliseconds.
+     */
+    public int getDuration() {
+        if (mCurrentRouteController == null) return 0;
+        return mCurrentRouteController.getDuration();
+    }
+
+    /**
+     * @return Whether the video is currently being played.
+     */
+    public boolean isPlaying() {
+        return mCurrentRouteController != null && mCurrentRouteController.isPlaying();
+    }
+
+    /**
+     * Initiates a seek request for the remote playback device to the specified position.
+     *
+     * @param msec The position to seek to, in milliseconds.
+     */
+    public void seekTo(int msec) {
+        if (mCurrentRouteController == null) return;
+        mCurrentRouteController.seekTo(msec);
+    }
+
+    public MediaRouteController getCurrentlyPlayingMediaRouteController() {
+        return mCurrentRouteController;
+    }
+
+    public void setCurrentMediaRouteController(MediaRouteController controller) {
+        mCurrentRouteController = controller;
+    }
+
+    private TransportControl getNotification() {
+        return mNotificationControl;
+    }
+
+    /**
+     *
+     */
+    private void createNotificationControl() {
+        mNotificationControl = NotificationTransportControl.getOrCreate(
+                mChromeVideoActivity.get(), mCurrentRouteController);
+        mNotificationControl.setError(null);
+        mNotificationControl.setScreenName(mCurrentRouteController.getRouteName());
+        mNotificationControl.addListener(mCurrentRouteController);
+    }
+
+    private TransportControl getLockScreen() {
+        return mLockScreenControl;
+    }
+
+    /**
+     *
+     */
+    private void createLockScreen() {
+        mLockScreenControl = LockScreenTransportControl.getOrCreate(
+                mChromeVideoActivity.get(), mCurrentRouteController);
+        if (mLockScreenControl != null) {
+            mLockScreenControl.setError(null);
+            mLockScreenControl.setScreenName(mCurrentRouteController.getRouteName());
+            mLockScreenControl.addListener(mCurrentRouteController);
+        }
+        if (mLockScreenControl != null) mLockScreenControl.setPosterBitmap(getPoster());
+    }
+
+    @Override
+    public void onPrepared(MediaRouteController mediaRouteController) {
+
+        startNotificationAndLockScreen(PlayerState.PLAYING, mediaRouteController);
+    }
+
+    @Override
+    public void onPlaybackStateChanged(PlayerState oldState, PlayerState newState) {
+        if (newState == PlayerState.PLAYING || newState == PlayerState.LOADING
+                || newState == PlayerState.PAUSED) {
+            TransportControl notificationControl = getNotification();
+            if (notificationControl != null) notificationControl.show(newState);
+            TransportControl lockScreen = getLockScreen();
+            if (lockScreen != null) lockScreen.show(newState);
+        }
+    }
+
+    @Override
+    public void onError(int error, String errorMessage) {
+        if (error == CastMediaControlIntent.ERROR_CODE_SESSION_START_FAILED) {
+            showMessageToast(errorMessage);
+        }
+    }
+
+    @Override
+    public void onDurationUpdated(int durationMillis) {}
+
+    @Override
+    public void onPositionChanged(int positionMillis) {}
+
+    @Override
+    public void onTitleChanged(String title) {}
+
+    @Override
+    public void onRouteSelected(String routeName, MediaRouteController mediaRouteController) {
+        if (mCurrentRouteController != mediaRouteController) {
+            mCurrentRouteController = mediaRouteController;
+            resetPlayingVideo();
+        }
+    }
+
+    /**
+     * Gets some text to tell the user that the video is being cast.
+     * @param routeName The name of the route on which the video is being cast.
+     * @return A String to be shown to the user.
+     */
+    public String getCastingMessage(String routeName) {
+        String castingMessage = DEFAULT_CASTING_MESSAGE;
+        if (mCastContextApplicationContext != null) {
+            castingMessage = mCastContextApplicationContext.getString(
+                    R.string.cast_casting_video, routeName);
+        }
+        return castingMessage;
+    }
+
+    // Note that, after switching MediaRouteControllers onRouteUnselected may be called for
+    // the old media route controller, so this should not do anything to
+    // mCurrentRouteController
+    @Override
+    public void onRouteUnselected(MediaRouteController mediaRouteController) {
+        if (mediaRouteController == mCurrentRouteController) {
+            mCurrentRouteController = null;
+        }
+    }
+
+    private void showMessageToast(String message) {
+        Toast toast = Toast.makeText(mCastContextApplicationContext, message, Toast.LENGTH_SHORT);
+        toast.show();
+    }
+
+    private void resetPlayingVideo() {
+        if (mNotificationControl != null) {
+            mNotificationControl.setRouteController(mCurrentRouteController);
+        }
+        if (mLockScreenControl != null) {
+            mLockScreenControl.setRouteController(mCurrentRouteController);
+        }
+    }
+
+    @VisibleForTesting
+    static RemoteMediaPlayerController getIfExists() {
+        return sInstance;
+    }
+
+}