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
17package com.android.camera.one.v1;
18
19import android.hardware.Camera;
20
21import com.android.camera.debug.Log;
22import com.android.camera.debug.Log.Tag;
23import com.android.camera.device.CameraId;
24import com.android.camera.one.OneCamera.Facing;
25import com.android.camera.one.OneCameraAccessException;
26import com.android.camera.one.OneCameraCharacteristics;
27import com.android.camera.one.OneCameraManager;
28import com.google.common.base.Optional;
29
30import javax.annotation.Nonnull;
31
32/**
33 * The {@link com.android.camera.one.OneCameraManager} implementation on top of the Camera API 1.
34 */
35public 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
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     */
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
105    public boolean hasCamera() {
106        return false;
107    }
108
109    @Override
110    public boolean hasCameraFacing(@Nonnull Facing facing) {
111        return findFirstCameraFacing(facing) != null;
112    }
113
114    @Override
115    public CameraId findFirstCamera() {
116        return mFirstBackCameraId;
117    }
118
119    @Override
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
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
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}