| /* |
| * 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.GenerateFieldPort; |
| import android.filterfw.core.GenerateFinalPort; |
| 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!"); |
| } |
| } |
| |
| } |