Unhide getAudioHandle

Test: make;
Bug: 139308734
Change-Id: I125da39637f3020af1afdd54d7ac6d8ec48971fa

api/system-current.txt

@@ -5049,6 +5049,7 @@ package android.media.tv.tuner.filter {
   }
 
   public class MediaEvent extends android.media.tv.tuner.filter.FilterEvent {
+    method public long getAudioHandle();
     method public long getAvDataId();
     method public long getDataLength();
     method @Nullable public android.media.tv.tuner.filter.AudioDescriptor getExtraMetaData();

media/java/android/media/tv/tuner/filter/MediaEvent.java

@@ -124,15 +124,16 @@ public class MediaEvent extends FilterEvent{
     }
 
     /**
-     * Reserves the ID which is used by HAL to provide additional information for AV data.
+     * Gets the audio handle.
      *
-     * <p>The corresponding data is used and released by {@link android.media.AudioTrack}.
-     * <p>The data is also released when the {@link Filter} instance is closed.
+     * <p>Client gets audio handle from {@link MediaEvent}, and queues it to
+     * {@link android.media.AudioTrack} in
+     * {@link android.media.AudioTrack#ENCAPSULATION_MODE_HANDLE} format.
      *
-     * @return the reserved AV data ID.
-     * @hide
+     * @return the audio handle.
+     * @see android.media.AudioTrack#ENCAPSULATION_MODE_HANDLE
      */
-    public long reserveAvDataId() {
+    public long getAudioHandle() {
         // TODO: implement
         return mDataId;
     }