1 /*
2  * Copyright (C) 2015 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.v1;
18 
19 import android.hardware.Camera;
20 
21 import com.android.camera.debug.Log;
22 import com.android.camera.debug.Log.Tag;
23 import com.android.camera.device.CameraId;
24 import com.android.camera.one.OneCamera.Facing;
25 import com.android.camera.one.OneCameraAccessException;
26 import com.android.camera.one.OneCameraCharacteristics;
27 import com.android.camera.one.OneCameraManager;
28 import com.google.common.base.Optional;
29 
30 import javax.annotation.Nonnull;
31 
32 /**
33  * The {@link com.android.camera.one.OneCameraManager} implementation on top of the Camera API 1.
34  */
35 public class LegacyOneCameraManagerImpl implements OneCameraManager {
36     private static final Tag TAG = new Tag("LegacyHM");
37     private static final int NO_DEVICE = -1;
38     private static final long CAMERA_ACCESS_TIMEOUT_MILLIS = 750;
39 
40     // Lazy singleton
41     private static Optional<LegacyOneCameraManagerImpl> INSTANCE;
42 
43     private final CameraId mFirstBackCameraId;
44     private final CameraId mFirstFrontCameraId;
45     private final Camera.CameraInfo[] mCameraInfos;
46 
47     private OneCameraCharacteristics mBackCameraCharacteristics;
48     private OneCameraCharacteristics mFrontCameraCharacteristics;
49 
instance()50     public static Optional<LegacyOneCameraManagerImpl> instance() {
51         if (INSTANCE != null) {
52             return INSTANCE;
53         }
54 
55         int numberOfCameras;
56         Camera.CameraInfo[] cameraInfos;
57         try {
58             numberOfCameras = Camera.getNumberOfCameras();
59             cameraInfos = new Camera.CameraInfo[numberOfCameras];
60             for (int i = 0; i < numberOfCameras; i++) {
61                 cameraInfos[i] = new Camera.CameraInfo();
62                 Camera.getCameraInfo(i, cameraInfos[i]);
63             }
64         } catch (RuntimeException ex) {
65             Log.e(TAG, "Exception while creating CameraDeviceInfo", ex);
66             return Optional.absent();
67         }
68 
69         int firstFront = NO_DEVICE;
70         int firstBack = NO_DEVICE;
71         // Get the first (smallest) back and first front camera id.
72         for (int i = numberOfCameras - 1; i >= 0; i--) {
73             if (cameraInfos[i].facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
74                 firstBack = i;
75             } else {
76                 if (cameraInfos[i].facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
77                     firstFront = i;
78                 }
79             }
80         }
81 
82         CameraId frontCameraId = firstFront >= 0 ? CameraId.fromLegacyId(firstFront) : null;
83         CameraId backCameraId = firstBack >= 0 ? CameraId.fromLegacyId(firstBack) : null;
84 
85         LegacyOneCameraManagerImpl cameraManager =
86               new LegacyOneCameraManagerImpl(backCameraId, frontCameraId, cameraInfos);
87         INSTANCE = Optional.of(cameraManager);
88         return INSTANCE;
89     }
90 
91     /**
92      * Instantiates a new {@link com.android.camera.one.OneCameraManager} for Camera1 API.
93      */
LegacyOneCameraManagerImpl( CameraId firstBackCameraId, CameraId firstFrontCameraId, Camera.CameraInfo[] info)94     public LegacyOneCameraManagerImpl(
95           CameraId firstBackCameraId,
96           CameraId firstFrontCameraId,
97           Camera.CameraInfo[] info) {
98         mFirstBackCameraId = firstBackCameraId;
99         mFirstFrontCameraId = firstFrontCameraId;
100 
101         mCameraInfos = info;
102     }
103 
104     @Override
hasCamera()105     public boolean hasCamera() {
106         return false;
107     }
108 
109     @Override
hasCameraFacing(@onnull Facing facing)110     public boolean hasCameraFacing(@Nonnull Facing facing) {
111         return findFirstCameraFacing(facing) != null;
112     }
113 
114     @Override
findFirstCamera()115     public CameraId findFirstCamera() {
116         return mFirstBackCameraId;
117     }
118 
119     @Override
findFirstCameraFacing(@onnull Facing facing)120     public CameraId findFirstCameraFacing(@Nonnull Facing facing) {
121         if (facing == Facing.BACK && mFirstBackCameraId != null) {
122             return mFirstBackCameraId;
123         } else if (facing == Facing.FRONT && mFirstFrontCameraId != null) {
124             return mFirstFrontCameraId;
125         }
126         return null;
127     }
128 
129     @Override
getOneCameraCharacteristics(@onnull CameraId cameraId)130     public OneCameraCharacteristics getOneCameraCharacteristics(@Nonnull CameraId cameraId)
131           throws OneCameraAccessException {
132         // Returns the cached object if there exists one.
133         if (cameraId.equals(mFirstBackCameraId)) {
134             if (mBackCameraCharacteristics == null) {
135                 Log.w(TAG, "WARNING: Computing potentially long running device access!"
136                       + cameraId);
137                 mBackCameraCharacteristics = computeCameraCharacteristics(cameraId);
138             }
139 
140             Log.w(TAG, "Returning camera characteristics for back camera."
141                   + cameraId);
142 
143             return mBackCameraCharacteristics;
144         } else if (cameraId.equals(mFirstFrontCameraId)) {
145             if (mFrontCameraCharacteristics == null) {
146                 Log.w(TAG, "WARNING: Computing potentially long running device access!"
147                       + cameraId);
148                 mFrontCameraCharacteristics = computeCameraCharacteristics(cameraId);
149             }
150 
151             Log.w(TAG, "Returning camera characteristics for front camera."
152                   + cameraId);
153             return mFrontCameraCharacteristics;
154         }
155 
156         Log.e(TAG, "BackCamera: " + mFirstBackCameraId + ", " + " ==? " + (mFirstBackCameraId
157               == cameraId));
158         Log.e(TAG, "FrontCamera: " + mFirstFrontCameraId);
159         Log.e(TAG, "No matching camera id for: " + cameraId);
160         return null;
161     }
162 
computeCameraCharacteristics(CameraId key)163     public OneCameraCharacteristics computeCameraCharacteristics(CameraId key)
164           throws OneCameraAccessException  {
165         OneCameraCharacteristics characteristics;
166         Camera camera = null;
167         try {
168             camera = Camera.open(key.getLegacyValue());
169             Camera.Parameters cameraParameters = camera.getParameters();
170             if (cameraParameters == null) {
171                 Log.e(TAG, "Camera object returned null parameters!");
172                 throw new OneCameraAccessException("API1 Camera.getParameters() returned null");
173             }
174             characteristics = new OneCameraCharacteristicsImpl(
175                   mCameraInfos[key.getLegacyValue()], cameraParameters);
176         } finally {
177             if (camera != null) {
178                 camera.release();
179             }
180         }
181 
182         return characteristics;
183     }
184 }