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 #ifndef _ACAMERA_MANAGER_H 18 #define _ACAMERA_MANAGER_H 19 20 #include <camera/NdkCameraManager.h> 21 22 #include <android-base/parseint.h> 23 #include <android/hardware/ICameraService.h> 24 #include <android/hardware/BnCameraServiceListener.h> 25 #include <camera/CameraMetadata.h> 26 #include <binder/IServiceManager.h> 27 #include <utils/StrongPointer.h> 28 #include <utils/Mutex.h> 29 30 #include <media/stagefright/foundation/ALooper.h> 31 #include <media/stagefright/foundation/AHandler.h> 32 #include <media/stagefright/foundation/AMessage.h> 33 34 #include <set> 35 #include <map> 36 37 namespace android { 38 39 /** 40 * Per-process singleton instance of CameraManger. Shared by all ACameraManager 41 * instances. Created when first ACameraManager is created and destroyed when 42 * all ACameraManager instances are deleted. 43 * 44 * TODO: maybe CameraManagerGlobal is better suited in libcameraclient? 45 */ 46 class CameraManagerGlobal final : public RefBase { 47 public: 48 static CameraManagerGlobal& getInstance(); 49 sp<hardware::ICameraService> getCameraService(); 50 51 void registerAvailabilityCallback( 52 const ACameraManager_AvailabilityCallbacks *callback); 53 void unregisterAvailabilityCallback( 54 const ACameraManager_AvailabilityCallbacks *callback); 55 56 /** 57 * Return camera IDs that support camera2 58 */ 59 void getCameraIdList(std::vector<String8> *cameraIds); 60 61 private: 62 sp<hardware::ICameraService> mCameraService; 63 const int kCameraServicePollDelay = 500000; // 0.5s 64 const char* kCameraServiceName = "media.camera"; 65 Mutex mLock; 66 67 class DeathNotifier : public IBinder::DeathRecipient { 68 public: 69 explicit DeathNotifier(CameraManagerGlobal* cm) : mCameraManager(cm) {} 70 protected: 71 // IBinder::DeathRecipient implementation 72 virtual void binderDied(const wp<IBinder>& who); 73 private: 74 const wp<CameraManagerGlobal> mCameraManager; 75 }; 76 sp<DeathNotifier> mDeathNotifier; 77 78 class CameraServiceListener final : public hardware::BnCameraServiceListener { 79 public: 80 explicit CameraServiceListener(CameraManagerGlobal* cm) : mCameraManager(cm) {} 81 virtual binder::Status onStatusChanged(int32_t status, const String16& cameraId); 82 83 // Torch API not implemented yet 84 virtual binder::Status onTorchStatusChanged(int32_t, const String16&) { 85 return binder::Status::ok(); 86 } 87 88 private: 89 const wp<CameraManagerGlobal> mCameraManager; 90 }; 91 sp<CameraServiceListener> mCameraServiceListener; 92 93 // Wrapper of ACameraManager_AvailabilityCallbacks so we can store it in std::set 94 struct Callback { 95 explicit Callback(const ACameraManager_AvailabilityCallbacks *callback) : 96 mAvailable(callback->onCameraAvailable), 97 mUnavailable(callback->onCameraUnavailable), 98 mContext(callback->context) {} 99 100 bool operator == (const Callback& other) const { 101 return (mAvailable == other.mAvailable && 102 mUnavailable == other.mUnavailable && 103 mContext == other.mContext); 104 } 105 bool operator != (const Callback& other) const { 106 return !(*this == other); 107 } 108 bool operator < (const Callback& other) const { 109 if (*this == other) return false; 110 if (mContext != other.mContext) return mContext < other.mContext; 111 if (mAvailable != other.mAvailable) return mAvailable < other.mAvailable; 112 return mUnavailable < other.mUnavailable; 113 } 114 bool operator > (const Callback& other) const { 115 return (*this != other && !(*this < other)); 116 } 117 ACameraManager_AvailabilityCallback mAvailable; 118 ACameraManager_AvailabilityCallback mUnavailable; 119 void* mContext; 120 }; 121 std::set<Callback> mCallbacks; 122 123 // definition of handler and message 124 enum { 125 kWhatSendSingleCallback 126 }; 127 static const char* kCameraIdKey; 128 static const char* kCallbackFpKey; 129 static const char* kContextKey; 130 class CallbackHandler : public AHandler { 131 public: 132 CallbackHandler() {} 133 void onMessageReceived(const sp<AMessage> &msg) override; 134 }; 135 sp<CallbackHandler> mHandler; 136 sp<ALooper> mCbLooper; // Looper thread where callbacks actually happen on 137 138 void onStatusChanged(int32_t status, const String8& cameraId); 139 void onStatusChangedLocked(int32_t status, const String8& cameraId); 140 // Utils for status 141 static bool validStatus(int32_t status); 142 static bool isStatusAvailable(int32_t status); 143 144 // The sort logic must match the logic in 145 // libcameraservice/common/CameraProviderManager.cpp::getAPI1CompatibleCameraDeviceIds 146 struct CameraIdComparator { 147 bool operator()(const String8& a, const String8& b) const { 148 uint32_t aUint = 0, bUint = 0; 149 bool aIsUint = base::ParseUint(a.c_str(), &aUint); 150 bool bIsUint = base::ParseUint(b.c_str(), &bUint); 151 152 // Uint device IDs first 153 if (aIsUint && bIsUint) { 154 return aUint < bUint; 155 } else if (aIsUint) { 156 return true; 157 } else if (bIsUint) { 158 return false; 159 } 160 // Simple string compare if both id are not uint 161 return a < b; 162 } 163 }; 164 165 // Map camera_id -> status 166 std::map<String8, int32_t, CameraIdComparator> mDeviceStatusMap; 167 168 // For the singleton instance 169 static Mutex sLock; 170 static CameraManagerGlobal* sInstance; 171 CameraManagerGlobal() {}; 172 ~CameraManagerGlobal(); 173 }; 174 175 } // namespace android; 176 177 /** 178 * ACameraManager opaque struct definition 179 * Leave outside of android namespace because it's NDK struct 180 */ 181 struct ACameraManager { 182 ACameraManager() : 183 mGlobalManager(&(android::CameraManagerGlobal::getInstance())) {} 184 ~ACameraManager(); 185 camera_status_t getCameraIdList(ACameraIdList** cameraIdList); 186 static void deleteCameraIdList(ACameraIdList* cameraIdList); 187 188 camera_status_t getCameraCharacteristics( 189 const char *cameraId, ACameraMetadata **characteristics); 190 camera_status_t openCamera(const char* cameraId, 191 ACameraDevice_StateCallbacks* callback, 192 /*out*/ACameraDevice** device); 193 194 private: 195 enum { 196 kCameraIdListNotInit = -1 197 }; 198 android::Mutex mLock; 199 android::sp<android::CameraManagerGlobal> mGlobalManager; 200 }; 201 202 #endif //_ACAMERA_MANAGER_H 203
