1/* 2** 3** Copyright (C) 2013, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18//#define LOG_NDEBUG 0 19#define LOG_TAG "CameraBase" 20#include <utils/Log.h> 21#include <utils/threads.h> 22#include <utils/Mutex.h> 23 24#include <binder/IPCThreadState.h> 25#include <binder/IServiceManager.h> 26#include <binder/IMemory.h> 27 28#include <camera/CameraBase.h> 29#include <camera/ICameraService.h> 30 31// needed to instantiate 32#include <camera/ProCamera.h> 33#include <camera/Camera.h> 34 35#include <system/camera_metadata.h> 36 37namespace android { 38 39namespace { 40 sp<ICameraService> gCameraService; 41 const int kCameraServicePollDelay = 500000; // 0.5s 42 const char* kCameraServiceName = "media.camera"; 43 44 Mutex gLock; 45 46 class DeathNotifier : public IBinder::DeathRecipient 47 { 48 public: 49 DeathNotifier() { 50 } 51 52 virtual void binderDied(const wp<IBinder>& /*who*/) { 53 ALOGV("binderDied"); 54 Mutex::Autolock _l(gLock); 55 gCameraService.clear(); 56 ALOGW("Camera service died!"); 57 } 58 }; 59 60 sp<DeathNotifier> gDeathNotifier; 61}; // namespace anonymous 62 63/////////////////////////////////////////////////////////// 64// CameraBase definition 65/////////////////////////////////////////////////////////// 66 67// establish binder interface to camera service 68template <typename TCam, typename TCamTraits> 69const sp<ICameraService>& CameraBase<TCam, TCamTraits>::getCameraService() 70{ 71 Mutex::Autolock _l(gLock); 72 if (gCameraService.get() == 0) { 73 sp<IServiceManager> sm = defaultServiceManager(); 74 sp<IBinder> binder; 75 do { 76 binder = sm->getService(String16(kCameraServiceName)); 77 if (binder != 0) { 78 break; 79 } 80 ALOGW("CameraService not published, waiting..."); 81 usleep(kCameraServicePollDelay); 82 } while(true); 83 if (gDeathNotifier == NULL) { 84 gDeathNotifier = new DeathNotifier(); 85 } 86 binder->linkToDeath(gDeathNotifier); 87 gCameraService = interface_cast<ICameraService>(binder); 88 } 89 ALOGE_IF(gCameraService == 0, "no CameraService!?"); 90 return gCameraService; 91} 92 93template <typename TCam, typename TCamTraits> 94sp<TCam> CameraBase<TCam, TCamTraits>::connect(int cameraId, 95 const String16& clientPackageName, 96 int clientUid) 97{ 98 ALOGV("%s: connect", __FUNCTION__); 99 sp<TCam> c = new TCam(cameraId); 100 sp<TCamCallbacks> cl = c; 101 status_t status = NO_ERROR; 102 const sp<ICameraService>& cs = getCameraService(); 103 104 if (cs != 0) { 105 TCamConnectService fnConnectService = TCamTraits::fnConnectService; 106 status = (cs.get()->*fnConnectService)(cl, cameraId, clientPackageName, clientUid, 107 /*out*/ c->mCamera); 108 } 109 if (status == OK && c->mCamera != 0) { 110 c->mCamera->asBinder()->linkToDeath(c); 111 c->mStatus = NO_ERROR; 112 } else { 113 ALOGW("An error occurred while connecting to camera: %d", cameraId); 114 c.clear(); 115 } 116 return c; 117} 118 119template <typename TCam, typename TCamTraits> 120void CameraBase<TCam, TCamTraits>::disconnect() 121{ 122 ALOGV("%s: disconnect", __FUNCTION__); 123 if (mCamera != 0) { 124 mCamera->disconnect(); 125 mCamera->asBinder()->unlinkToDeath(this); 126 mCamera = 0; 127 } 128 ALOGV("%s: disconnect (done)", __FUNCTION__); 129} 130 131template <typename TCam, typename TCamTraits> 132CameraBase<TCam, TCamTraits>::CameraBase(int cameraId) : 133 mStatus(UNKNOWN_ERROR), 134 mCameraId(cameraId) 135{ 136} 137 138template <typename TCam, typename TCamTraits> 139CameraBase<TCam, TCamTraits>::~CameraBase() 140{ 141} 142 143template <typename TCam, typename TCamTraits> 144sp<typename TCamTraits::TCamUser> CameraBase<TCam, TCamTraits>::remote() 145{ 146 return mCamera; 147} 148 149template <typename TCam, typename TCamTraits> 150status_t CameraBase<TCam, TCamTraits>::getStatus() 151{ 152 return mStatus; 153} 154 155template <typename TCam, typename TCamTraits> 156void CameraBase<TCam, TCamTraits>::binderDied(const wp<IBinder>& /*who*/) { 157 ALOGW("mediaserver's remote binder Camera object died"); 158 notifyCallback(CAMERA_MSG_ERROR, CAMERA_ERROR_SERVER_DIED, /*ext2*/0); 159} 160 161template <typename TCam, typename TCamTraits> 162void CameraBase<TCam, TCamTraits>::setListener(const sp<TCamListener>& listener) 163{ 164 Mutex::Autolock _l(mLock); 165 mListener = listener; 166} 167 168// callback from camera service 169template <typename TCam, typename TCamTraits> 170void CameraBase<TCam, TCamTraits>::notifyCallback(int32_t msgType, 171 int32_t ext1, 172 int32_t ext2) 173{ 174 sp<TCamListener> listener; 175 { 176 Mutex::Autolock _l(mLock); 177 listener = mListener; 178 } 179 if (listener != NULL) { 180 listener->notify(msgType, ext1, ext2); 181 } 182} 183 184template <typename TCam, typename TCamTraits> 185int CameraBase<TCam, TCamTraits>::getNumberOfCameras() { 186 const sp<ICameraService> cs = getCameraService(); 187 188 if (!cs.get()) { 189 // as required by the public Java APIs 190 return 0; 191 } 192 return cs->getNumberOfCameras(); 193} 194 195// this can be in BaseCamera but it should be an instance method 196template <typename TCam, typename TCamTraits> 197status_t CameraBase<TCam, TCamTraits>::getCameraInfo(int cameraId, 198 struct CameraInfo* cameraInfo) { 199 const sp<ICameraService>& cs = getCameraService(); 200 if (cs == 0) return UNKNOWN_ERROR; 201 return cs->getCameraInfo(cameraId, cameraInfo); 202} 203 204template <typename TCam, typename TCamTraits> 205status_t CameraBase<TCam, TCamTraits>::addServiceListener( 206 const sp<ICameraServiceListener>& listener) { 207 const sp<ICameraService>& cs = getCameraService(); 208 if (cs == 0) return UNKNOWN_ERROR; 209 return cs->addListener(listener); 210} 211 212template <typename TCam, typename TCamTraits> 213status_t CameraBase<TCam, TCamTraits>::removeServiceListener( 214 const sp<ICameraServiceListener>& listener) { 215 const sp<ICameraService>& cs = getCameraService(); 216 if (cs == 0) return UNKNOWN_ERROR; 217 return cs->removeListener(listener); 218} 219 220template class CameraBase<ProCamera>; 221template class CameraBase<Camera>; 222 223} // namespace android 224