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 
17 package com.android.camera.one.v2.initialization;
18 
19 import android.view.Surface;
20 
21 import com.android.camera.one.OneCamera;
22 import com.android.camera.one.v2.camera2proxy.CameraCaptureSessionProxy;
23 import com.android.camera.util.ApiHelper;
24 import com.google.common.util.concurrent.AsyncFunction;
25 import com.google.common.util.concurrent.Futures;
26 import com.google.common.util.concurrent.ListenableFuture;
27 
28 import java.util.ArrayList;
29 import java.util.List;
30 
31 /**
32  * When the preview surface is available, creates a capture session, and then
33  * notifies the listener when the session is available.
34  */
35 class PreviewStarter {
36     public interface CameraCaptureSessionCreatedListener {
onCameraCaptureSessionCreated(CameraCaptureSessionProxy session, Surface previewSurface)37         public void onCameraCaptureSessionCreated(CameraCaptureSessionProxy session, Surface
38                 previewSurface);
39     }
40 
41     private final List<Surface> mOutputSurfaces;
42     private final CaptureSessionCreator mCaptureSessionCreator;
43     private final CameraCaptureSessionCreatedListener mSessionListener;
44 
45     /**
46      * @param outputSurfaces The set of output surfaces (except for the preview
47      *            surface) to use.
48      * @param captureSessionCreator
49      * @param sessionListener A callback to be invoked when the capture session
50      *            has been created. It is executed on threadPoolExecutor.
51      */
PreviewStarter(List<Surface> outputSurfaces, CaptureSessionCreator captureSessionCreator, CameraCaptureSessionCreatedListener sessionListener)52     public PreviewStarter(List<Surface> outputSurfaces,
53             CaptureSessionCreator captureSessionCreator,
54             CameraCaptureSessionCreatedListener sessionListener) {
55         mOutputSurfaces = outputSurfaces;
56         mCaptureSessionCreator = captureSessionCreator;
57         mSessionListener = sessionListener;
58     }
59 
60     /**
61      * See {@link OneCamera#startPreview}.
62      *
63      * @param surface The preview surface to use.
64      */
startPreview(final Surface surface)65     public ListenableFuture<Void> startPreview(final Surface surface) {
66         // When we have the preview surface, start the capture session.
67         List<Surface> surfaceList = new ArrayList<>();
68 
69         // Workaround of the face detection failure on Nexus 5 and L. (b/21039466)
70         // Need to create a capture session with the single preview stream first
71         // to lock it as the first stream. Then resend the another session with preview
72         // and JPEG stream.
73         if (ApiHelper.isLorLMr1() && ApiHelper.IS_NEXUS_5) {
74             surfaceList.add(surface);
75             mCaptureSessionCreator.createCaptureSession(surfaceList);
76             surfaceList.addAll(mOutputSurfaces);
77         } else {
78             surfaceList.addAll(mOutputSurfaces);
79             surfaceList.add(surface);
80         }
81 
82         final ListenableFuture<CameraCaptureSessionProxy> sessionFuture =
83                 mCaptureSessionCreator.createCaptureSession(surfaceList);
84 
85         return Futures.transform(sessionFuture,
86                 new AsyncFunction<CameraCaptureSessionProxy, Void>() {
87                     @Override
88                     public ListenableFuture<Void> apply(
89                             CameraCaptureSessionProxy captureSession) throws Exception {
90                         mSessionListener.onCameraCaptureSessionCreated(captureSession, surface);
91                         return Futures.immediateFuture(null);
92                     }
93                 });
94     }
95 }
96