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      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 
     17 package androidx.media.filterfw.samples.simplecamera;
     18 
     19 import androidx.media.filterfw.Filter;
     20 import androidx.media.filterfw.FrameType;
     21 import androidx.media.filterfw.FrameValue;
     22 import androidx.media.filterfw.InputPort;
     23 import androidx.media.filterfw.MffContext;
     24 import androidx.media.filterfw.OutputPort;
     25 import 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.
     29 public 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