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.FrameFormat; 24import android.filterfw.core.GenerateFieldPort; 25import android.filterfw.core.GenerateFinalPort; 26import android.filterfw.core.KeyValueMap; 27import android.filterfw.core.NativeProgram; 28import android.filterfw.core.NativeFrame; 29import android.filterfw.core.Program; 30import android.os.Handler; 31import android.os.Looper; 32 33import java.lang.Runnable; 34 35/** 36 * @hide 37 */ 38public class CallbackFilter extends Filter { 39 40 @GenerateFieldPort(name = "listener", hasDefault = true) 41 private FilterContext.OnFrameReceivedListener mListener; 42 43 @GenerateFieldPort(name = "userData", hasDefault = true) 44 private Object mUserData; 45 46 @GenerateFinalPort(name = "callUiThread", hasDefault = true) 47 private boolean mCallbacksOnUiThread = true; 48 49 private Handler mUiThreadHandler; 50 51 private class CallbackRunnable implements Runnable { 52 private Filter mFilter; 53 private Frame mFrame; 54 private Object mUserData; 55 private FilterContext.OnFrameReceivedListener mListener; 56 57 public CallbackRunnable(FilterContext.OnFrameReceivedListener listener, Filter filter, Frame frame, Object userData) { 58 mListener = listener; 59 mFilter = filter; 60 mFrame = frame; 61 mUserData = userData; 62 } 63 64 public void run() { 65 mListener.onFrameReceived(mFilter, mFrame, mUserData); 66 mFrame.release(); 67 } 68 } 69 70 public CallbackFilter(String name) { 71 super(name); 72 } 73 74 @Override 75 public void setupPorts() { 76 addInputPort("frame"); 77 } 78 79 public void prepare(FilterContext context) { 80 if (mCallbacksOnUiThread) { 81 mUiThreadHandler = new Handler(Looper.getMainLooper()); 82 } 83 } 84 85 public void process(FilterContext context) { 86 // Get frame and forward to listener 87 final Frame input = pullInput("frame"); 88 if (mListener != null) { 89 if (mCallbacksOnUiThread) { 90 input.retain(); 91 CallbackRunnable uiRunnable = new CallbackRunnable(mListener, this, input, mUserData); 92 if (!mUiThreadHandler.post(uiRunnable)) { 93 throw new RuntimeException("Unable to send callback to UI thread!"); 94 } 95 } else { 96 mListener.onFrameReceived(this, input, mUserData); 97 } 98 } else { 99 throw new RuntimeException("CallbackFilter received frame, but no listener set!"); 100 } 101 } 102 103} 104