1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.camera.one.v2.photo;
18
19import static com.android.camera.one.v2.core.ResponseListeners.forFrameExposure;
20
21import android.hardware.camera2.CameraAccessException;
22import android.hardware.camera2.CameraDevice;
23
24import com.android.camera.async.BufferQueue;
25import com.android.camera.async.Updatable;
26import com.android.camera.async.UpdatableCountDownLatch;
27import com.android.camera.one.v2.camera2proxy.CameraCaptureSessionClosedException;
28import com.android.camera.one.v2.camera2proxy.ImageProxy;
29import com.android.camera.one.v2.core.FrameServer;
30import com.android.camera.one.v2.core.RequestBuilder;
31import com.android.camera.one.v2.core.ResourceAcquisitionFailedException;
32import com.android.camera.one.v2.imagesaver.ImageSaver;
33import com.android.camera.one.v2.sharedimagereader.ManagedImageReader;
34import com.android.camera.one.v2.sharedimagereader.imagedistributor.ImageStream;
35
36import java.util.Arrays;
37
38import javax.annotation.ParametersAreNonnullByDefault;
39
40/**
41 * Captures single images.
42 */
43@ParametersAreNonnullByDefault
44class SimpleImageCaptureCommand implements ImageCaptureCommand {
45    private final FrameServer mFrameServer;
46    private final RequestBuilder.Factory mBuilderFactory;
47    private final ManagedImageReader mImageReader;
48
49    public SimpleImageCaptureCommand(FrameServer frameServer, RequestBuilder.Factory builder,
50            ManagedImageReader imageReader) {
51        mFrameServer = frameServer;
52        mBuilderFactory = builder;
53        mImageReader = imageReader;
54    }
55
56    /**
57     * Sends a request to take a picture and blocks until it completes.
58     */
59    @Override
60    public void run(Updatable<Void> imageExposureUpdatable, ImageSaver imageSaver) throws
61            InterruptedException, CameraAccessException, CameraCaptureSessionClosedException,
62            ResourceAcquisitionFailedException {
63        try (FrameServer.Session session = mFrameServer.createExclusiveSession();
64                ImageStream imageStream = mImageReader.createStream(1)) {
65            UpdatableCountDownLatch<Void> exposureLatch = new UpdatableCountDownLatch<>(1);
66            RequestBuilder photoRequest = mBuilderFactory.create(CameraDevice
67                    .TEMPLATE_STILL_CAPTURE);
68            photoRequest.addStream(imageStream);
69            MetadataFuture metadataFuture = new MetadataFuture();
70            photoRequest.addResponseListener(metadataFuture);
71            photoRequest.addResponseListener(forFrameExposure(imageExposureUpdatable));
72            photoRequest.addResponseListener(forFrameExposure(exposureLatch));
73            session.submitRequest(Arrays.asList(photoRequest.build()),
74                    FrameServer.RequestType.NON_REPEATING);
75
76            // Release the FrameServer session (allowing subsequent camera
77            // operations to occur) as soon as the image is exposed.
78            exposureLatch.await();
79            session.close();
80
81            ImageProxy image = imageStream.getNext();
82            imageSaver.addFullSizeImage(image, metadataFuture.getMetadata());
83        } catch (BufferQueue.BufferQueueClosedException e) {
84            // If we get here, the request was submitted, but the image
85            // never arrived.
86            // TODO Log failure and notify the caller
87        } finally {
88            imageSaver.close();
89        }
90    }
91}
92