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; 26 27/** 28 * @hide 29 */ 30public class FrameFetch extends Filter { 31 32 @GenerateFinalPort(name = "format", hasDefault = true) 33 private FrameFormat mFormat; 34 35 @GenerateFieldPort(name = "key") 36 private String mKey; 37 38 @GenerateFieldPort(name = "repeatFrame", hasDefault = true) 39 private boolean mRepeatFrame = false; 40 41 public FrameFetch(String name) { 42 super(name); 43 } 44 45 @Override 46 public void setupPorts() { 47 addOutputPort("frame", mFormat == null ? FrameFormat.unspecified() : mFormat); 48 } 49 50 public void process(FilterContext context) { 51 Frame output = context.fetchFrame(mKey); 52 if (output != null) { 53 pushOutput("frame", output); 54 if (!mRepeatFrame) { 55 closeOutputPort("frame"); 56 } 57 } else { 58 delayNextProcess(250); 59 } 60 } 61 62} 63