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 package androidx.media.filterpacks.base; 18 19 import androidx.media.filterfw.*; 20 21 // TODO: Rename back to ValueSource? Seems to make more sense even if we use it as a Variable 22 // in some contexts. 23 public final class VariableSource extends Filter { 24 25 private Object mValue = null; 26 private OutputPort mOutputPort = null; 27 28 public VariableSource(MffContext context, String name) { 29 super(context, name); 30 } 31 32 public synchronized void setValue(Object value) { 33 mValue = value; 34 } 35 36 public synchronized Object getValue() { 37 return mValue; 38 } 39 40 @Override 41 public Signature getSignature() { 42 return new Signature() 43 .addOutputPort("value", Signature.PORT_REQUIRED, FrameType.single()) 44 .disallowOtherPorts(); 45 } 46 47 @Override 48 protected void onPrepare() { 49 mOutputPort = getConnectedOutputPort("value"); 50 } 51 52 @Override 53 protected synchronized void onProcess() { 54 FrameValue frame = mOutputPort.fetchAvailableFrame(null).asFrameValue(); 55 frame.setValue(mValue); 56 mOutputPort.pushFrame(frame); 57 } 58 59 } 60 61
