1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 18package android.filterpacks.base; 19 20import android.filterfw.core.Filter; 21import android.filterfw.core.FilterContext; 22import android.filterfw.core.Frame; 23import android.filterfw.core.GenerateFieldPort; 24import android.filterfw.core.GenerateFinalPort; 25import android.os.Handler; 26import android.os.Looper; 27 28import java.lang.Runnable; 29 30/** 31 * @hide 32 */ 33public class CallbackFilter extends Filter { 34 35 @GenerateFieldPort(name = "listener", hasDefault = true) 36 private FilterContext.OnFrameReceivedListener mListener; 37 38 @GenerateFieldPort(name = "userData", hasDefault = true) 39 private Object mUserData; 40 41 @GenerateFinalPort(name = "callUiThread", hasDefault = true) 42 private boolean mCallbacksOnUiThread = true; 43 44 private Handler mUiThreadHandler; 45 46 private class CallbackRunnable implements Runnable { 47 private Filter mFilter; 48 private Frame mFrame; 49 private Object mUserData; 50 private FilterContext.OnFrameReceivedListener mListener; 51 52 public CallbackRunnable(FilterContext.OnFrameReceivedListener listener, Filter filter, Frame frame, Object userData) { 53 mListener = listener; 54 mFilter = filter; 55 mFrame = frame; 56 mUserData = userData; 57 } 58 59 public void run() { 60 mListener.onFrameReceived(mFilter, mFrame, mUserData); 61 mFrame.release(); 62 } 63 } 64 65 public CallbackFilter(String name) { 66 super(name); 67 } 68 69 @Override 70 public void setupPorts() { 71 addInputPort("frame"); 72 } 73 74 public void prepare(FilterContext context) { 75 if (mCallbacksOnUiThread) { 76 mUiThreadHandler = new Handler(Looper.getMainLooper()); 77 } 78 } 79 80 public void process(FilterContext context) { 81 // Get frame and forward to listener 82 final Frame input = pullInput("frame"); 83 if (mListener != null) { 84 if (mCallbacksOnUiThread) { 85 input.retain(); 86 CallbackRunnable uiRunnable = new CallbackRunnable(mListener, this, input, mUserData); 87 if (!mUiThreadHandler.post(uiRunnable)) { 88 throw new RuntimeException("Unable to send callback to UI thread!"); 89 } 90 } else { 91 mListener.onFrameReceived(this, input, mUserData); 92 } 93 } else { 94 throw new RuntimeException("CallbackFilter received frame, but no listener set!"); 95 } 96 } 97 98} 99