1 files changed, 103 insertions, 0 deletions
diff --git a/media/mca/filterpacks/java/android/filterpacks/base/CallbackFilter.java b/media/mca/filterpacks/java/android/filterpacks/base/CallbackFilter.java
new file mode 100644
index 0000000..4185343
--- /dev/null
+++ b/media/mca/filterpacks/java/android/filterpacks/base/CallbackFilter.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package android.filterpacks.base;
+
+import android.filterfw.core.Filter;
+import android.filterfw.core.FilterContext;
+import android.filterfw.core.Frame;
+import android.filterfw.core.FrameFormat;
+import android.filterfw.core.GenerateFieldPort;
+import android.filterfw.core.GenerateFinalPort;
+import android.filterfw.core.KeyValueMap;
+import android.filterfw.core.NativeProgram;
+import android.filterfw.core.NativeFrame;
+import android.filterfw.core.Program;
+import android.os.Handler;
+import android.os.Looper;
+
+import java.lang.Runnable;
+
+/**
+ * @hide
+ */
+public class CallbackFilter extends Filter {
+
+    @GenerateFieldPort(name = "listener", hasDefault = true)
+    private FilterContext.OnFrameReceivedListener mListener;
+
+    @GenerateFieldPort(name = "userData", hasDefault = true)
+    private Object mUserData;
+
+    @GenerateFinalPort(name = "callUiThread", hasDefault = true)
+    private boolean mCallbacksOnUiThread = true;
+
+    private Handler mUiThreadHandler;
+
+    private class CallbackRunnable implements Runnable {
+        private Filter mFilter;
+        private Frame mFrame;
+        private Object mUserData;
+        private FilterContext.OnFrameReceivedListener mListener;
+
+        public CallbackRunnable(FilterContext.OnFrameReceivedListener listener, Filter filter, Frame frame, Object userData) {
+            mListener = listener;
+            mFilter = filter;
+            mFrame = frame;
+            mUserData = userData;
+        }
+
+        public void run() {
+            mListener.onFrameReceived(mFilter, mFrame, mUserData);
+            mFrame.release();
+        }
+    }
+
+    public CallbackFilter(String name) {
+        super(name);
+    }
+
+    @Override
+    public void setupPorts() {
+        addInputPort("frame");
+    }
+
+    public void prepare(FilterContext context) {
+        if (mCallbacksOnUiThread) {
+            mUiThreadHandler = new Handler(Looper.getMainLooper());
+        }
+    }
+
+    public void process(FilterContext context) {
+        // Get frame and forward to listener
+        final Frame input = pullInput("frame");
+        if (mListener != null) {
+            if (mCallbacksOnUiThread) {
+                input.retain();
+                CallbackRunnable uiRunnable = new CallbackRunnable(mListener, this, input, mUserData);
+                if (!mUiThreadHandler.post(uiRunnable)) {
+                    throw new RuntimeException("Unable to send callback to UI thread!");
+                }
+            } else {
+                mListener.onFrameReceived(this, input, mUserData);
+            }
+        } else {
+            throw new RuntimeException("CallbackFilter received frame, but no listener set!");
+        }
+    }
+
+}