Refine SharedFilter close() to avoid random crash

Bug: 205763272
Fix: 205763272
Test: atest CtsTvTestCases
Change-Id: Ieee0d07fefa902d832745b040b9144e02fe9ba56

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

@@ -92,9 +92,21 @@ public final class SharedFilter implements AutoCloseable {
                     synchronized (mCallbackLock) {
                         if (mCallback != null) {
                             mCallback.onFilterEvent(this, events);
+                        } else {
+                            for (FilterEvent event : events) {
+                                if (event instanceof MediaEvent) {
+                                    ((MediaEvent)event).release();
+                                }
+                            }
                         }
                     }
                 });
+            } else {
+                for (FilterEvent event : events) {
+                    if (event instanceof MediaEvent) {
+                        ((MediaEvent)event).release();
+                    }
+                }
             }
         }
     }
@@ -187,6 +199,8 @@ public final class SharedFilter implements AutoCloseable {
             if (mIsClosed) {
                 return;
             }
+            mCallback = null;
+            mExecutor = null;
             nativeSharedClose();
             mIsClosed = true;
          }

media/jni/android_media_tv_Tuner.cpp

@@ -4147,6 +4147,7 @@ static jint android_media_tv_Tuner_close_filter(JNIEnv *env, jobject filter) {
 
     Result r = filterClient->close();
     filterClient->decStrong(filter);
+    filterClient = nullptr;
     if (shared) {
         env->SetLongField(filter, gFields.sharedFilterContext, 0);
     } else {