Haoxiang Li | c888859 | 2019-09-19 16:39:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 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 | #ifndef CAR_LIB_EVS_SUPPORT_RESOURCEMANAGER_H |
| 18 | #define CAR_LIB_EVS_SUPPORT_RESOURCEMANAGER_H |
| 19 | |
| 20 | #include <utils/RefBase.h> |
| 21 | #include <unordered_map> |
| 22 | #include <mutex> |
| 23 | |
| 24 | #include <android/hardware/automotive/evs/1.0/IEvsEnumerator.h> |
| 25 | |
| 26 | #include "StreamHandler.h" |
| 27 | |
| 28 | namespace android { |
| 29 | namespace automotive { |
| 30 | namespace evs { |
| 31 | namespace support { |
| 32 | |
| 33 | using ::android::sp; |
| 34 | using ::std::string; |
| 35 | using ::std::mutex; |
| 36 | using ::std::unordered_map; |
| 37 | |
| 38 | /* |
| 39 | * Manages EVS related resources. E.g. evs camera, stream handler, and display. |
| 40 | * |
| 41 | * The methods in the class are guaranteed to be thread-safe. |
| 42 | */ |
| 43 | class ResourceManager : public android::RefBase { |
| 44 | public: |
| 45 | /* |
| 46 | * Gets the singleton instance of the class. |
| 47 | */ |
| 48 | static sp<ResourceManager> getInstance(); |
| 49 | |
| 50 | /* |
| 51 | * Obtains a StreamHandler instance to receive evs camera imagery from the |
| 52 | * given camera. |
| 53 | * |
| 54 | * When this function is called with a new camera id the first time, an evs |
| 55 | * camera instance will be opened. An internal reference count will be |
| 56 | * incremented by one every time when this method is called with the same |
| 57 | * camera id. The count will be decreased by one when releaseStreamHandler |
| 58 | * method is called, and when the reference count for the camera is |
| 59 | * decreased to zero, the stream handler will be shut down and the evs |
| 60 | * camera instance will be closed. |
| 61 | * |
| 62 | * The method will block other stream handler related calls. For example, |
| 63 | * method releaseStreamHandler. |
| 64 | * |
| 65 | * @see releaseStreamHandler() |
| 66 | */ |
| 67 | sp<StreamHandler> obtainStreamHandler(string pCameraId); |
| 68 | |
| 69 | /* |
| 70 | * Releases the StreamHandler associated with the given camera. |
| 71 | * |
| 72 | * An internal reference count will be decreased when this method is |
| 73 | * called. When the count is down to zero, the stream handler will be shut |
| 74 | * down and the evs camera instance will be closed. |
| 75 | * |
| 76 | * The method will block other stream handler related calls. For example, |
| 77 | * method obtainStreamHandler. |
| 78 | * |
| 79 | * @see obtainStreamHandler() |
| 80 | */ |
| 81 | void releaseStreamHandler(string pCameraId); |
| 82 | |
| 83 | /* |
| 84 | * Obtains an interface object used to exclusively interact with the |
| 85 | * system's evs display. |
| 86 | * |
| 87 | * @see closeDisplay() |
| 88 | */ |
| 89 | sp<IEvsDisplay> openDisplay(); |
| 90 | |
| 91 | /* |
| 92 | * Releases the evs display interface. |
| 93 | * |
| 94 | * @see openDisplay() |
| 95 | */ |
| 96 | void closeDisplay(sp<IEvsDisplay>); |
| 97 | |
| 98 | /** |
| 99 | * Returns true if display is opened by openDisplay method; returns false |
| 100 | * if display is never opened, or closed by closeDisplay method. |
| 101 | * |
| 102 | * @see openDisplay() |
| 103 | * @see closeDisplay() |
| 104 | */ |
| 105 | bool isDisplayOpened(); |
| 106 | |
| 107 | private: |
| 108 | static sp<IEvsEnumerator> getEvsEnumerator(string serviceName = kDefaultServiceName); |
| 109 | |
| 110 | static const string kDefaultServiceName; |
| 111 | |
| 112 | static sp<ResourceManager> sInstance; |
| 113 | static sp<IEvsEnumerator> sEvs; |
| 114 | static mutex sLockSingleton, sLockEvs; |
| 115 | |
| 116 | class CameraInstance : public RefBase { |
| 117 | public: |
| 118 | int useCaseCount = 0; |
| 119 | string cameraId; |
| 120 | sp<IEvsCamera> camera; |
| 121 | sp<StreamHandler> handler; |
| 122 | |
| 123 | private: |
| 124 | void onLastStrongRef(const void* /*id*/) { |
| 125 | ALOGD("StreamHandler::onLastStrongRef"); |
| 126 | |
| 127 | handler->shutdown(); |
| 128 | ALOGD("Stream handler for camera id (%s) has been shutdown", |
| 129 | cameraId.c_str()); |
| 130 | |
| 131 | getEvsEnumerator()->closeCamera(camera); |
| 132 | ALOGD("Camera with id (%s) has been closed", cameraId.c_str()); |
| 133 | } |
| 134 | }; |
| 135 | |
| 136 | sp<IEvsDisplay> mDisplay; |
| 137 | unordered_map<string, sp<CameraInstance>> mCameraInstances; |
| 138 | mutex mLockStreamHandler, mLockDisplay; |
| 139 | }; |
| 140 | |
| 141 | } // namespace support |
| 142 | } // namespace evs |
| 143 | } // namespace automotive |
| 144 | } // namespace android |
| 145 | |
| 146 | #endif //CAR_LIB_EVS_SUPPORT_RESOURCEMANAGER_H |