MediaPlayer: add mPreparing to weed out unwanted prepared messages

Bug: 21266735
Change-Id: Ie4fe76533c9b7f505c57ba63df7992f2490942cc

1 files changed, 31 insertions, 2 deletions

diff --git a/media/java/android/media/MediaPlayer.java b/media/java/android/media/MediaPlayer.java
index f148606..c24077e 100644
--- a/media/java/android/media/MediaPlayer.java
+++ b/media/java/android/media/MediaPlayer.java
@@ -77,6 +77,7 @@ import java.util.Map;
 import java.util.Scanner;
 import java.util.Set;
 import java.util.Vector;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.lang.ref.WeakReference;
 
 /**
@@ -623,6 +624,9 @@ public class MediaPlayer implements SubtitleController.Listener
     private int mUsage = -1;
     private boolean mBypassInterruptionPolicy;
 
+    // use AtomicBoolean instead of boolean so we can use the same member both as a flag and a lock.
+    private AtomicBoolean mPreparing = new AtomicBoolean();
+
     /**
      * Default constructor. Consider using one of the create() methods for
      * synchronously instantiating a MediaPlayer from a Uri or resource.
@@ -1162,6 +1166,10 @@ public class MediaPlayer implements SubtitleController.Listener
      * @throws IllegalStateException if it is called in an invalid state
      */
     public void prepare() throws IOException, IllegalStateException {
+        // The synchronous version of prepare also recieves a MEDIA_PREPARED message.
+        synchronized (mPreparing) {
+            mPreparing.set(true);
+        }
         _prepare();
         scanInternalSubtitleTracks();
     }
@@ -1178,7 +1186,14 @@ public class MediaPlayer implements SubtitleController.Listener
      *
      * @throws IllegalStateException if it is called in an invalid state
      */
-    public native void prepareAsync() throws IllegalStateException;
+    public void prepareAsync() throws IllegalStateException {
+        synchronized (mPreparing) {
+            mPreparing.set(true);
+        }
+        _prepareAsync();
+    }
+
+    private native void _prepareAsync() throws IllegalStateException;
 
     /**
      * Starts or resumes playback. If playback had previously been paused,
@@ -1229,6 +1244,9 @@ public class MediaPlayer implements SubtitleController.Listener
      * initialized.
      */
     public void stop() throws IllegalStateException {
+        synchronized (mPreparing) {
+            mPreparing.set(false);
+        }
         stayAwake(false);
         _stop();
     }
@@ -1658,6 +1676,9 @@ public class MediaPlayer implements SubtitleController.Listener
      * at the same time.
      */
     public void release() {
+        synchronized (mPreparing) {
+            mPreparing.set(false);
+        }
         stayAwake(false);
         updateSurfaceScreenOn();
         mOnPreparedListener = null;
@@ -1684,6 +1705,9 @@ public class MediaPlayer implements SubtitleController.Listener
      * data source and calling prepare().
      */
     public void reset() {
+        synchronized (mPreparing) {
+            mPreparing.set(false);
+        }
         mSelectedSubtitleTrackIndex = -1;
         synchronized(mOpenSubtitleSources) {
             for (final InputStream is: mOpenSubtitleSources) {
@@ -2804,7 +2828,12 @@ public class MediaPlayer implements SubtitleController.Listener
             }
             switch(msg.what) {
             case MEDIA_PREPARED:
-                scanInternalSubtitleTracks();
+                synchronized (mPreparing) {
+                    if (mPreparing.get()) {
+                        scanInternalSubtitleTracks();
+                        mPreparing.set(false);
+                    }
+                }
                 if (mOnPreparedListener != null)
                     mOnPreparedListener.onPrepared(mMediaPlayer);
                 return;