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.testingcamera2;
18
19import java.util.HashSet;
20import java.util.Set;
21
22import android.content.Context;
23import android.hardware.camera2.CameraCharacteristics;
24import android.hardware.camera2.CameraDevice;
25import android.hardware.camera2.CameraManager;
26import android.hardware.camera2.CameraAccessException;
27
28/**
29 * A central manager of camera devices and current clients for them.
30 *
31 */
32public class CameraOps2 extends CameraManager.AvailabilityCallback {
33
34    private final CameraManager mCameraManager;
35
36    private final Set<CameraDevice> mOpenCameras = new HashSet<CameraDevice>();
37
38    public CameraOps2(Context context) {
39        mCameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
40        if (mCameraManager == null) {
41            throw new AssertionError("Can't connect to camera manager!");
42        }
43        try {
44            String[] cameraIds = mCameraManager.getCameraIdList();
45            TLog.i("Camera count: %d", cameraIds.length);
46            for (String cameraId : cameraIds) {
47                TLog.i("  Camera %s", cameraId);
48            }
49        } catch (CameraAccessException e) {
50            TLog.e("Unable to get camera list: %s", e);
51        }
52
53        mCameraManager.registerAvailabilityCallback(this, /*handler*/null);
54    }
55
56    /**
57     * Add a listener for new camera addition events, and retrieve the list of
58     * current cameras
59     *
60     * @param listener
61     *            A listener to notify on changes to camera availability
62     * @return the current list of available cameras
63     * @throws CameraAccessException
64     *             if the camera manager cannot be queried
65     */
66    public String[] getCamerasAndListen(CameraManager.AvailabilityCallback listener)
67            throws CameraAccessException {
68
69        mCameraManager.registerAvailabilityCallback(listener, /*handler*/null);
70
71        return mCameraManager.getCameraIdList();
72    }
73
74    public void removeAvailabilityCallback(CameraManager.AvailabilityCallback listener) {
75        mCameraManager.unregisterAvailabilityCallback(listener);
76    }
77
78    @Override
79    public void onCameraAvailable(String cameraId) {
80        TLog.i("Camera %s is now available", cameraId);
81    }
82
83    @Override
84    public void onCameraUnavailable(String cameraId) {
85        TLog.i("Camera %s is now unavailable", cameraId);
86    }
87
88    /**
89     * Attempt to open a camera device. Returns false if the open call cannot be
90     * made or the device is already open
91     *
92     * @param cameraId id of the camera to open
93     * @param listener listener to notify of camera device state changes
94     * @return true if open call was sent successfully. The client needs to wait
95     *         for its listener to be called to determine if open will succeed.
96     */
97    public boolean openCamera(String cameraId, CameraDevice.StateCallback listener) {
98        for (CameraDevice camera : mOpenCameras) {
99            if (camera.getId() == cameraId) {
100                TLog.e("Camera %s is already open", cameraId);
101                return false;
102            }
103        }
104        try {
105            DeviceStateCallback proxyListener = new DeviceStateCallback(listener);
106            mCameraManager.openCamera(cameraId, proxyListener, null);
107        } catch (CameraAccessException e) {
108            TLog.e("Unable to open camera %s.", e, cameraId);
109            return false;
110        }
111
112        return true;
113    }
114
115    public CameraCharacteristics getCameraInfo(String cameraId) {
116        try {
117            return mCameraManager.getCameraCharacteristics(cameraId);
118        } catch (CameraAccessException e) {
119            TLog.e("Unable to get camera characteristics for camera %s.", e, cameraId);
120        }
121        return null;
122    }
123
124    private class DeviceStateCallback extends CameraDevice.StateCallback {
125
126        private final CameraDevice.StateCallback mClientListener;
127
128        public DeviceStateCallback(CameraDevice.StateCallback clientListener) {
129            mClientListener = clientListener;
130        }
131
132        @Override
133        public void onClosed(CameraDevice camera) {
134            mOpenCameras.remove(camera);
135            TLog.i("Camera %s now closed", camera.getId());
136            mClientListener.onClosed(camera);
137        }
138
139        @Override
140        public void onDisconnected(CameraDevice camera) {
141            TLog.i("Camera %s now disconnected", camera.getId());
142            mClientListener.onDisconnected(camera);
143        }
144
145        @Override
146        public void onError(CameraDevice camera, int error) {
147            TLog.i("Camera %s encountered error: %d", camera.getId(), error);
148            mClientListener.onError(camera, error);
149        }
150
151        @Override
152        public void onOpened(CameraDevice camera) {
153            mOpenCameras.add(camera);
154            TLog.i("Camera %s now open", camera.getId());
155            mClientListener.onOpened(camera);
156        }
157
158    }
159}
160