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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.media.filterfw.samples.simplecamera;
import androidx.media.filterfw.Filter;
import androidx.media.filterfw.FrameType;
import androidx.media.filterfw.FrameValue;
import androidx.media.filterfw.InputPort;
import androidx.media.filterfw.MffContext;
import androidx.media.filterfw.OutputPort;
import androidx.media.filterfw.Signature;
// The Filter is used to generate the camera snap effect.
// The effect is to give the image a sudden white appearance.
public final class WaveTriggerFilter extends Filter {
private boolean mTrigger = false;
private boolean mInWaveMode = false;
private float mTime = 0f;
public WaveTriggerFilter(MffContext context, String name) {
super(context, name);
}
@Override
public Signature getSignature() {
return new Signature()
.addOutputPort("value", Signature.PORT_REQUIRED, FrameType.single())
.disallowOtherPorts();
}
public synchronized void trigger() {
mTrigger = true;
}
@Override
public void onInputPortOpen(InputPort port) {
if (port.getName().equals("trigger")) {
port.bindToFieldNamed("mTrigger");
port.setAutoPullEnabled(true);
}
}
@Override
protected synchronized void onProcess() {
// Check if we were triggered
if (mTrigger) {
mInWaveMode = true;
mTrigger = false;
mTime = 0.5f;
}
// Calculate output value
float value = 0.5f;
if (mInWaveMode) {
value = -Math.abs(mTime - 1f) + 1f;
mTime += 0.2f;
if (mTime >= 2f) {
mInWaveMode = false;
}
}
// Push Value
OutputPort outPort = getConnectedOutputPort("value");
FrameValue frame = outPort.fetchAvailableFrame(null).asFrameValue();
frame.setValue(value);
outPort.pushFrame(frame);
}
}
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