ZslRingBuffer.java
/*
* Copyright 2022 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.camera.core.internal.utils;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.camera.core.ImageInfo;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.impl.CameraCaptureMetaData.AeState;
import androidx.camera.core.impl.CameraCaptureMetaData.AfState;
import androidx.camera.core.impl.CameraCaptureMetaData.AwbState;
import androidx.camera.core.impl.CameraCaptureResult;
import androidx.camera.core.impl.CameraCaptureResults;
/**
* Used for storing frames for ZSL capture.
*
* <p>Enqueueing process ignores frames when the quality is inadequate for ZSL capture.</p>
*
* <p>Adequate quality is defined as:
* - AF Focused
* - AE Converged
* - AWB Converged
* </p>
*/
@RequiresApi(21)
public final class ZslRingBuffer extends ArrayRingBuffer<ImageProxy> {
public ZslRingBuffer(int ringBufferCapacity,
@NonNull OnRemoveCallback<ImageProxy> onRemoveCallback) {
super(ringBufferCapacity, onRemoveCallback);
}
@Override
public void enqueue(@NonNull ImageProxy imageProxy) {
if (isValidZslFrame(imageProxy.getImageInfo())) {
super.enqueue(imageProxy);
} else {
mOnRemoveCallback.onRemove(imageProxy);
}
}
private boolean isValidZslFrame(@NonNull ImageInfo imageInfo) {
CameraCaptureResult cameraCaptureResult =
CameraCaptureResults.retrieveCameraCaptureResult(imageInfo);
if (cameraCaptureResult.getAfState() != AfState.LOCKED_FOCUSED
&& cameraCaptureResult.getAfState() != AfState.PASSIVE_FOCUSED) {
return false;
}
if (cameraCaptureResult.getAeState() != AeState.CONVERGED) {
return false;
}
if (cameraCaptureResult.getAwbState() != AwbState.CONVERGED) {
return false;
}
return true;
}
}