AdaptingPreviewProcessor.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.extensions;
import android.hardware.camera2.CaptureResult;
import android.hardware.camera2.TotalCaptureResult;
import android.media.Image;
import android.util.Log;
import android.util.Size;
import android.view.Surface;
import androidx.camera.camera2.impl.Camera2CameraCaptureResultConverter;
import androidx.camera.core.ExperimentalGetImage;
import androidx.camera.core.ImageInfo;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.impl.CameraCaptureResult;
import androidx.camera.core.impl.CameraCaptureResults;
import androidx.camera.core.impl.CaptureProcessor;
import androidx.camera.core.impl.ImageProxyBundle;
import androidx.camera.extensions.impl.PreviewImageProcessorImpl;
import androidx.core.util.Preconditions;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.List;
import java.util.concurrent.ExecutionException;
/** A {@link CaptureProcessor} that calls a vendor provided preview processing implementation. */
final class AdaptingPreviewProcessor implements CaptureProcessor,
PreviewExtender.CloseableProcessor {
private static final String TAG = "AdaptingPreviewProcesso";
private final PreviewImageProcessorImpl mImpl;
private BlockingCloseAccessCounter mAccessCounter = new BlockingCloseAccessCounter();
AdaptingPreviewProcessor(PreviewImageProcessorImpl impl) {
mImpl = impl;
}
@Override
public void onOutputSurface(Surface surface, int imageFormat) {
if (!mAccessCounter.tryIncrement()) {
return;
}
try {
mImpl.onOutputSurface(surface, imageFormat);
mImpl.onImageFormatUpdate(imageFormat);
} finally {
mAccessCounter.decrement();
}
}
@Override
@ExperimentalGetImage
public void process(ImageProxyBundle bundle) {
List<Integer> ids = bundle.getCaptureIds();
Preconditions.checkArgument(ids.size() == 1,
"Processing preview bundle must be 1, but found " + ids.size());
ListenableFuture<ImageProxy> imageProxyListenableFuture = bundle.getImageProxy(
ids.get(0));
Preconditions.checkArgument(imageProxyListenableFuture.isDone());
ImageProxy imageProxy;
try {
imageProxy = imageProxyListenableFuture.get();
} catch (ExecutionException | InterruptedException e) {
Log.e(TAG, "Unable to retrieve ImageProxy from bundle");
return;
}
Image image = imageProxy.getImage();
ImageInfo imageInfo = imageProxy.getImageInfo();
CameraCaptureResult result =
CameraCaptureResults.retrieveCameraCaptureResult(imageInfo);
CaptureResult captureResult =
Camera2CameraCaptureResultConverter.getCaptureResult(result);
TotalCaptureResult totalCaptureResult = null;
if (captureResult instanceof TotalCaptureResult) {
totalCaptureResult = (TotalCaptureResult) captureResult;
}
if (image == null) {
return;
}
if (!mAccessCounter.tryIncrement()) {
return;
}
try {
mImpl.process(image, totalCaptureResult);
} finally {
mAccessCounter.decrement();
}
}
@Override
public void onResolutionUpdate(Size size) {
if (!mAccessCounter.tryIncrement()) {
return;
}
try {
mImpl.onResolutionUpdate(size);
} finally {
mAccessCounter.decrement();
}
}
@Override
public void close() {
mAccessCounter.destroyAndWaitForZeroAccess();
}
}