JpegBytes2Image.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.imagecapture;
import static android.graphics.ImageFormat.JPEG;
import static androidx.camera.core.ImageProcessingUtil.convertJpegBytesToImage;
import static androidx.camera.core.ImageReaderProxys.createIsolatedReader;
import static java.util.Objects.requireNonNull;
import android.os.Build;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.camera.core.ImageCaptureException;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.SafeCloseImageReaderProxy;
import androidx.camera.core.processing.Operation;
import androidx.camera.core.processing.Packet;
/**
* Converts JPEG bytes to {@link ImageProxy}.
*/
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public class JpegBytes2Image implements Operation<Packet<byte[]>, Packet<ImageProxy>> {
private static final int MAX_IMAGES = 2;
@NonNull
@Override
public Packet<ImageProxy> apply(@NonNull Packet<byte[]> packet) throws ImageCaptureException {
// TODO: loosen the restriction in ImageCapture#enforceSoftwareJpegConstraints() to enable
// the YUV code path on API level <26.
SafeCloseImageReaderProxy jpegImageReaderProxy = new SafeCloseImageReaderProxy(
createIsolatedReader(
packet.getSize().getWidth(),
packet.getSize().getHeight(),
JPEG,
MAX_IMAGES));
ImageProxy imageProxy = convertJpegBytesToImage(jpegImageReaderProxy, packet.getData());
jpegImageReaderProxy.safeClose();
return Packet.of(
requireNonNull(imageProxy),
requireNonNull(packet.getExif()),
packet.getCropRect(),
packet.getRotationDegrees(), packet.getSensorToBufferTransform(),
packet.getCameraCaptureResult());
}
}