1/* 2 * Copyright (C) 2012 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 17package androidx.media.filterfw.samples.simplecamera; 18 19import androidx.media.filterfw.Filter; 20import androidx.media.filterfw.FrameType; 21import androidx.media.filterfw.FrameValue; 22import androidx.media.filterfw.InputPort; 23import androidx.media.filterfw.MffContext; 24import androidx.media.filterfw.OutputPort; 25import androidx.media.filterfw.Signature; 26 27// The Filter is used to generate the camera snap effect. 28// The effect is to give the image a sudden white appearance. 29public final class WaveTriggerFilter extends Filter { 30 31 private boolean mTrigger = false; 32 private boolean mInWaveMode = false; 33 private float mTime = 0f; 34 35 public WaveTriggerFilter(MffContext context, String name) { 36 super(context, name); 37 } 38 39 @Override 40 public Signature getSignature() { 41 return new Signature() 42 .addOutputPort("value", Signature.PORT_REQUIRED, FrameType.single()) 43 .disallowOtherPorts(); 44 } 45 46 public synchronized void trigger() { 47 mTrigger = true; 48 } 49 50 @Override 51 public void onInputPortOpen(InputPort port) { 52 if (port.getName().equals("trigger")) { 53 port.bindToFieldNamed("mTrigger"); 54 port.setAutoPullEnabled(true); 55 } 56 } 57 58 @Override 59 protected synchronized void onProcess() { 60 // Check if we were triggered 61 if (mTrigger) { 62 mInWaveMode = true; 63 mTrigger = false; 64 mTime = 0.5f; 65 } 66 67 // Calculate output value 68 float value = 0.5f; 69 if (mInWaveMode) { 70 value = -Math.abs(mTime - 1f) + 1f; 71 mTime += 0.2f; 72 if (mTime >= 2f) { 73 mInWaveMode = false; 74 } 75 } 76 77 // Push Value 78 OutputPort outPort = getConnectedOutputPort("value"); 79 FrameValue frame = outPort.fetchAvailableFrame(null).asFrameValue(); 80 frame.setValue(value); 81 outPort.pushFrame(frame); 82 } 83} 84