ImageAnalysisBlockingCallback.java
/*
* Copyright 2019 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;
import android.os.Handler;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
/**
* OnImageAvailableListener with blocking behavior. It never drops image without analyzing it.
*
* <p> Used with {@link ImageAnalysis}.
*/
final class ImageAnalysisBlockingCallback implements ImageReaderProxy.OnImageAvailableListener {
private static final String TAG = "BlockingCallback";
final AtomicReference<ImageAnalysis.Analyzer> mSubscribedAnalyzer;
final AtomicInteger mRelativeRotation;
private final Handler mUserHandler;
ImageAnalysisBlockingCallback(AtomicReference<ImageAnalysis.Analyzer> subscribedAnalyzer,
AtomicInteger relativeRotation, Handler userHandler) {
mSubscribedAnalyzer = subscribedAnalyzer;
mRelativeRotation = relativeRotation;
mUserHandler = userHandler;
}
@Override
public void onImageAvailable(ImageReaderProxy imageReaderProxy) {
ImageProxy image = imageReaderProxy.acquireNextImage();
if (image == null) {
return;
}
try {
mUserHandler.post(new Runnable() {
@Override
public void run() {
try {
ImageAnalysis.Analyzer analyzer = mSubscribedAnalyzer.get();
if (analyzer != null) {
analyzer.analyze(image, mRelativeRotation.get());
}
} finally {
image.close();
}
}
});
} catch (RuntimeException e) {
image.close();
}
}
}