Upstream Chrome for Android Cast.

chrome/android/java/src/org/chromium/chrome/browser/media/remote/LockScreenTransportControlV14.java

Index: chrome/android/java/src/org/chromium/chrome/browser/media/remote/LockScreenTransportControlV14.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/remote/LockScreenTransportControlV14.java b/chrome/android/java/src/org/chromium/chrome/browser/media/remote/LockScreenTransportControlV14.java
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+// Copyright 2014 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.annotation.TargetApi;
+import android.app.PendingIntent;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.graphics.Bitmap;
+import android.media.AudioManager;
+import android.media.AudioManager.OnAudioFocusChangeListener;
+import android.media.MediaMetadataRetriever;
+import android.os.Build;
+import android.util.Log;
+
+import org.chromium.base.CommandLine;
+import org.chromium.chrome.ChromeSwitches;
+import org.chromium.chrome.browser.media.remote.RemoteVideoInfo.PlayerState;
+
+/**
+ * An implementation of {@link LockScreenTransportControl} targeting platforms with an API of 14 or
+ * above.
+ */
+@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
+// TODO(aberent) This whole class is based upon RemoteControlClient, which is deprecated in
+// the Android L SDK. It, however, still seems to be the only way of controlling the
+// lock screen wallpaper. We need to investigate whether there is an alternative. See
+// LockScreenTransportControl.java.
+@SuppressWarnings("deprecation")
+public class LockScreenTransportControlV14 extends LockScreenTransportControl {
+
+    private static final String TAG = "LockScreenTransportControlV14";
+
+    private static boolean sDebug;
+    private final AudioManager mAudioManager;
+    private final PendingIntent mMediaPendingIntent;
+    private final ComponentName mMediaEventReceiver;
+    private final AudioFocusListener mAudioFocusListener;
+
+    private android.media.RemoteControlClient mRemoteControlClient;
+    private boolean mIsPlaying;
+
+    protected LockScreenTransportControlV14(Context context) {
+        sDebug = CommandLine.getInstance().hasSwitch(ChromeSwitches.ENABLE_CAST_DEBUG_LOGS);
+
+        mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
+        mMediaEventReceiver = new ComponentName(context.getPackageName(),
+                MediaButtonIntentReceiver.class.getName());
+        Intent mediaButtonIntent = new Intent(Intent.ACTION_MEDIA_BUTTON);
+        mediaButtonIntent.setComponent(mMediaEventReceiver);
+        mMediaPendingIntent = PendingIntent.getBroadcast(context.getApplicationContext(), 0,
+                mediaButtonIntent, 0);
+        mAudioFocusListener = new AudioFocusListener();
+    }
+
+    @Override
+    public void onErrorChanged() {
+        if (hasError()) updatePlaybackState(android.media.RemoteControlClient.PLAYSTATE_ERROR);
+    }
+
+    @Override
+    public void onLockScreenPlaybackStateChanged(PlayerState oldState, PlayerState newState) {
+        if (sDebug) Log.d(TAG, "onLockScreenPlaybackStateChanged - new state: " + newState);
+        int playbackState = android.media.RemoteControlClient.PLAYSTATE_STOPPED;
+        boolean shouldBeRegistered = false;
+        if (newState != null) {
+            mIsPlaying = false;
+            shouldBeRegistered = true;
+            switch (newState) {
+                case PAUSED:
+                    playbackState = android.media.RemoteControlClient.PLAYSTATE_PAUSED;
+                    break;
+                case ERROR:
+                    playbackState = android.media.RemoteControlClient.PLAYSTATE_ERROR;
+                    break;
+                case PLAYING:
+                    playbackState = android.media.RemoteControlClient.PLAYSTATE_PLAYING;
+                    mIsPlaying = true;
+                    break;
+                case LOADING:
+                    playbackState = android.media.RemoteControlClient.PLAYSTATE_BUFFERING;
+                    break;
+                default:
+                    shouldBeRegistered = false;
+                    break;
+            }
+        }
+
+        boolean registered = (mRemoteControlClient != null);
+        if (registered != shouldBeRegistered) {
+            if (shouldBeRegistered) {
+                register();
+                onVideoInfoChanged();
+                onPosterBitmapChanged();
+            } else {
+                unregister();
+            }
+        }
+
+        updatePlaybackState(playbackState);
+    }
+
+    @Override
+    public void onVideoInfoChanged() {
+        if (mRemoteControlClient == null) return;
+
+        RemoteVideoInfo videoInfo = getVideoInfo();
+
+        String title = null;
+        long duration = 0;
+        if (videoInfo != null) {
+            title = videoInfo.title;
+            duration = videoInfo.durationMillis;
+        }
+
+        android.media.RemoteControlClient.MetadataEditor editor = mRemoteControlClient.editMetadata(
+                true);
+        editor.putString(MediaMetadataRetriever.METADATA_KEY_TITLE, title);
+        editor.putLong(MediaMetadataRetriever.METADATA_KEY_DURATION, duration);
+        updateBitmap(editor);
+        editor.apply();
+    }
+
+    @Override
+    public void onPosterBitmapChanged() {
+        if (mRemoteControlClient == null) return;
+
+        android.media.RemoteControlClient.MetadataEditor editor = mRemoteControlClient.editMetadata(
+                false);
+        updateBitmap(editor);
+        editor.apply();
+    }
+
+    private void updateBitmap(android.media.RemoteControlClient.MetadataEditor editor) {
+        // RemoteControlClient likes to recycle bitmaps that have been passed to it through
+        // BITMAP_KEY_ARTWORK. We can't go recycling bitmaps like this since they are also used by
+        // {@link ExpandedControllerActivity} and their life cycle is controller by
+        // {@link RemoteMediaPlayerController}. See crbug.com/356612
+        Bitmap src = getPosterBitmap();
+        Bitmap copy = src != null ? src.copy(src.getConfig(), true) : null;
+        editor.putBitmap(android.media.RemoteControlClient.MetadataEditor.BITMAP_KEY_ARTWORK, copy);
+    }
+
+    protected final android.media.RemoteControlClient getRemoteControlClient() {
+        return mRemoteControlClient;
+    }
+
+    protected void register() {
+        if (sDebug) Log.d(TAG, "register called");
+        mRemoteControlClient = new android.media.RemoteControlClient(mMediaPendingIntent);
+        mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.USE_DEFAULT_STREAM_TYPE,
+                AudioManager.AUDIOFOCUS_GAIN);
+        mAudioManager.registerMediaButtonEventReceiver(mMediaEventReceiver);
+        mAudioManager.registerRemoteControlClient(mRemoteControlClient);
+        mRemoteControlClient.setTransportControlFlags(getTransportControlFlags());
+    }
+
+    protected void unregister() {
+        if (sDebug) Log.d(TAG, "unregister called");
+        mRemoteControlClient.editMetadata(true).apply();
+        mRemoteControlClient.setTransportControlFlags(0);
+        mAudioManager.abandonAudioFocus(mAudioFocusListener);
+        mAudioManager.unregisterMediaButtonEventReceiver(mMediaEventReceiver);
+        mAudioManager.unregisterRemoteControlClient(mRemoteControlClient);
+        mRemoteControlClient = null;
+    }
+
+    protected void updatePlaybackState(int state) {
+        if (mRemoteControlClient != null) mRemoteControlClient.setPlaybackState(state);
+    }
+
+    protected int getTransportControlFlags() {
+        return android.media.RemoteControlClient.FLAG_KEY_MEDIA_PLAY_PAUSE
+                | android.media.RemoteControlClient.FLAG_KEY_MEDIA_STOP;
+    }
+
+    private static class AudioFocusListener implements OnAudioFocusChangeListener {
+        @Override
+        public void onAudioFocusChange(int focusChange) {
+            // Do nothing, the listener is only used to later abandon audio focus.
+        }
+    }
+
+    // TODO(aberent): Investigate moving some or all of the MediaRouterController.Listener
+    // implementations to TransportControl. See http://crbug/354490.
+    @Override
+    public void onRouteSelected(String name, MediaRouteController mediaRouteController) {
+        setScreenName(name);
+    }
+
+    @Override
+    public void onRouteUnselected(MediaRouteController mediaRouteController) {
+        hide();
+    }
+
+    @Override
+    public void onPrepared(MediaRouteController mediaRouteController) {
+    }
+
+    @Override
+    public void onError(int error, String errorMessage) {
+        // Stop the session for all errors
+        hide();
+    }
+
+    @Override
+    public void onDurationUpdated(int durationMillis) {
+        RemoteVideoInfo videoInfo = new RemoteVideoInfo(getVideoInfo());
+        videoInfo.durationMillis = durationMillis;
+        setVideoInfo(videoInfo);
+    }
+
+    @Override
+    public void onPositionChanged(int positionMillis) {
+        RemoteVideoInfo videoInfo = new RemoteVideoInfo(getVideoInfo());
+        videoInfo.currentTimeMillis = positionMillis;
+        setVideoInfo(videoInfo);
+    }
+
+    @Override
+    public void onTitleChanged(String title) {
+        RemoteVideoInfo videoInfo = new RemoteVideoInfo(getVideoInfo());
+        videoInfo.title = title;
+        setVideoInfo(videoInfo);
+    }
+
+    @Override
+    protected boolean isPlaying() {
+        return mIsPlaying;
+    }
+}