Camera.cpp revision 0319aaecb03aa83924ab4e3d9c9bc657c2e8bc06
1/* 2** 3** Copyright (C) 2008, 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 "Camera" 20#include <utils/Log.h> 21#include <utils/threads.h> 22 23#include <binder/IServiceManager.h> 24#include <binder/IMemory.h> 25 26#include <camera/Camera.h> 27#include <camera/ICameraService.h> 28 29#include <surfaceflinger/Surface.h> 30 31namespace android { 32 33// client singleton for camera service binder interface 34Mutex Camera::mLock; 35sp<ICameraService> Camera::mCameraService; 36sp<Camera::DeathNotifier> Camera::mDeathNotifier; 37 38// establish binder interface to camera service 39const sp<ICameraService>& Camera::getCameraService() 40{ 41 Mutex::Autolock _l(mLock); 42 if (mCameraService.get() == 0) { 43 sp<IServiceManager> sm = defaultServiceManager(); 44 sp<IBinder> binder; 45 do { 46 binder = sm->getService(String16("media.camera")); 47 if (binder != 0) 48 break; 49 LOGW("CameraService not published, waiting..."); 50 usleep(500000); // 0.5 s 51 } while(true); 52 if (mDeathNotifier == NULL) { 53 mDeathNotifier = new DeathNotifier(); 54 } 55 binder->linkToDeath(mDeathNotifier); 56 mCameraService = interface_cast<ICameraService>(binder); 57 } 58 LOGE_IF(mCameraService==0, "no CameraService!?"); 59 return mCameraService; 60} 61 62// --------------------------------------------------------------------------- 63 64Camera::Camera() 65{ 66 init(); 67} 68 69// construct a camera client from an existing camera remote 70sp<Camera> Camera::create(const sp<ICamera>& camera) 71{ 72 LOGV("create"); 73 if (camera == 0) { 74 LOGE("camera remote is a NULL pointer"); 75 return 0; 76 } 77 78 sp<Camera> c = new Camera(); 79 if (camera->connect(c) == NO_ERROR) { 80 c->mStatus = NO_ERROR; 81 c->mCamera = camera; 82 camera->asBinder()->linkToDeath(c); 83 } 84 return c; 85} 86 87void Camera::init() 88{ 89 mStatus = UNKNOWN_ERROR; 90} 91 92Camera::~Camera() 93{ 94 // We don't need to call disconnect() here because if the CameraService 95 // thinks we are the owner of the hardware, it will hold a (strong) 96 // reference to us, and we can't possibly be here. We also don't want to 97 // call disconnect() here if we are in the same process as mediaserver, 98 // because we may be invoked by CameraService::Client::connect() and will 99 // deadlock if we call any method of ICamera here. 100} 101 102int32_t Camera::getNumberOfCameras() 103{ 104 const sp<ICameraService>& cs = getCameraService(); 105 if (cs == 0) return 0; 106 return cs->getNumberOfCameras(); 107} 108 109status_t Camera::getCameraInfo(int cameraId, 110 struct CameraInfo* cameraInfo) { 111 const sp<ICameraService>& cs = getCameraService(); 112 if (cs == 0) return UNKNOWN_ERROR; 113 return cs->getCameraInfo(cameraId, cameraInfo); 114} 115 116sp<Camera> Camera::connect(int cameraId) 117{ 118 LOGV("connect"); 119 sp<Camera> c = new Camera(); 120 const sp<ICameraService>& cs = getCameraService(); 121 if (cs != 0) { 122 c->mCamera = cs->connect(c, cameraId); 123 } 124 if (c->mCamera != 0) { 125 c->mCamera->asBinder()->linkToDeath(c); 126 c->mStatus = NO_ERROR; 127 } else { 128 c.clear(); 129 } 130 return c; 131} 132 133void Camera::disconnect() 134{ 135 LOGV("disconnect"); 136 if (mCamera != 0) { 137 mCamera->disconnect(); 138 mCamera->asBinder()->unlinkToDeath(this); 139 mCamera = 0; 140 } 141} 142 143status_t Camera::reconnect() 144{ 145 LOGV("reconnect"); 146 sp <ICamera> c = mCamera; 147 if (c == 0) return NO_INIT; 148 return c->connect(this); 149} 150 151sp<ICamera> Camera::remote() 152{ 153 return mCamera; 154} 155 156status_t Camera::lock() 157{ 158 sp <ICamera> c = mCamera; 159 if (c == 0) return NO_INIT; 160 return c->lock(); 161} 162 163status_t Camera::unlock() 164{ 165 sp <ICamera> c = mCamera; 166 if (c == 0) return NO_INIT; 167 return c->unlock(); 168} 169 170// pass the buffered ISurface to the camera service 171status_t Camera::setPreviewDisplay(const sp<Surface>& surface) 172{ 173 LOGV("setPreviewDisplay"); 174 sp <ICamera> c = mCamera; 175 if (c == 0) return NO_INIT; 176 if (surface != 0) { 177 return c->setPreviewDisplay(surface->getISurface()); 178 } else { 179 LOGD("app passed NULL surface"); 180 return c->setPreviewDisplay(0); 181 } 182} 183 184status_t Camera::setPreviewDisplay(const sp<ISurface>& surface) 185{ 186 LOGV("setPreviewDisplay"); 187 if (surface == 0) { 188 LOGD("app passed NULL surface"); 189 } 190 sp <ICamera> c = mCamera; 191 if (c == 0) return NO_INIT; 192 return c->setPreviewDisplay(surface); 193} 194 195 196// start preview mode 197status_t Camera::startPreview() 198{ 199 LOGV("startPreview"); 200 sp <ICamera> c = mCamera; 201 if (c == 0) return NO_INIT; 202 return c->startPreview(); 203} 204 205// start recording mode, must call setPreviewDisplay first 206status_t Camera::startRecording() 207{ 208 LOGV("startRecording"); 209 sp <ICamera> c = mCamera; 210 if (c == 0) return NO_INIT; 211 return c->startRecording(); 212} 213 214// stop preview mode 215void Camera::stopPreview() 216{ 217 LOGV("stopPreview"); 218 sp <ICamera> c = mCamera; 219 if (c == 0) return; 220 c->stopPreview(); 221} 222 223// stop recording mode 224void Camera::stopRecording() 225{ 226 LOGV("stopRecording"); 227 sp <ICamera> c = mCamera; 228 if (c == 0) return; 229 c->stopRecording(); 230} 231 232// release a recording frame 233void Camera::releaseRecordingFrame(const sp<IMemory>& mem) 234{ 235 LOGV("releaseRecordingFrame"); 236 sp <ICamera> c = mCamera; 237 if (c == 0) return; 238 c->releaseRecordingFrame(mem); 239} 240 241// get preview state 242bool Camera::previewEnabled() 243{ 244 LOGV("previewEnabled"); 245 sp <ICamera> c = mCamera; 246 if (c == 0) return false; 247 return c->previewEnabled(); 248} 249 250// get recording state 251bool Camera::recordingEnabled() 252{ 253 LOGV("recordingEnabled"); 254 sp <ICamera> c = mCamera; 255 if (c == 0) return false; 256 return c->recordingEnabled(); 257} 258 259status_t Camera::autoFocus() 260{ 261 LOGV("autoFocus"); 262 sp <ICamera> c = mCamera; 263 if (c == 0) return NO_INIT; 264 return c->autoFocus(); 265} 266 267status_t Camera::cancelAutoFocus() 268{ 269 LOGV("cancelAutoFocus"); 270 sp <ICamera> c = mCamera; 271 if (c == 0) return NO_INIT; 272 return c->cancelAutoFocus(); 273} 274 275// take a picture 276status_t Camera::takePicture() 277{ 278 LOGV("takePicture"); 279 sp <ICamera> c = mCamera; 280 if (c == 0) return NO_INIT; 281 return c->takePicture(); 282} 283 284// set preview/capture parameters - key/value pairs 285status_t Camera::setParameters(const String8& params) 286{ 287 LOGV("setParameters"); 288 sp <ICamera> c = mCamera; 289 if (c == 0) return NO_INIT; 290 return c->setParameters(params); 291} 292 293// get preview/capture parameters - key/value pairs 294String8 Camera::getParameters() const 295{ 296 LOGV("getParameters"); 297 String8 params; 298 sp <ICamera> c = mCamera; 299 if (c != 0) params = mCamera->getParameters(); 300 return params; 301} 302 303// send command to camera driver 304status_t Camera::sendCommand(int32_t cmd, int32_t arg1, int32_t arg2) 305{ 306 LOGV("sendCommand"); 307 sp <ICamera> c = mCamera; 308 if (c == 0) return NO_INIT; 309 return c->sendCommand(cmd, arg1, arg2); 310} 311 312void Camera::setListener(const sp<CameraListener>& listener) 313{ 314 Mutex::Autolock _l(mLock); 315 mListener = listener; 316} 317 318void Camera::setPreviewCallbackFlags(int flag) 319{ 320 LOGV("setPreviewCallbackFlags"); 321 sp <ICamera> c = mCamera; 322 if (c == 0) return; 323 mCamera->setPreviewCallbackFlag(flag); 324} 325 326// callback from camera service 327void Camera::notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2) 328{ 329 sp<CameraListener> listener; 330 { 331 Mutex::Autolock _l(mLock); 332 listener = mListener; 333 } 334 if (listener != NULL) { 335 listener->notify(msgType, ext1, ext2); 336 } 337} 338 339// callback from camera service when frame or image is ready 340void Camera::dataCallback(int32_t msgType, const sp<IMemory>& dataPtr) 341{ 342 sp<CameraListener> listener; 343 { 344 Mutex::Autolock _l(mLock); 345 listener = mListener; 346 } 347 if (listener != NULL) { 348 listener->postData(msgType, dataPtr); 349 } 350} 351 352// callback from camera service when timestamped frame is ready 353void Camera::dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr) 354{ 355 sp<CameraListener> listener; 356 { 357 Mutex::Autolock _l(mLock); 358 listener = mListener; 359 } 360 if (listener != NULL) { 361 listener->postDataTimestamp(timestamp, msgType, dataPtr); 362 } 363} 364 365void Camera::binderDied(const wp<IBinder>& who) { 366 LOGW("ICamera died"); 367 notifyCallback(CAMERA_MSG_ERROR, CAMERA_ERROR_SERVER_DIED, 0); 368} 369 370void Camera::DeathNotifier::binderDied(const wp<IBinder>& who) { 371 LOGV("binderDied"); 372 Mutex::Autolock _l(Camera::mLock); 373 Camera::mCameraService.clear(); 374 LOGW("Camera server died!"); 375} 376 377}; // namespace android 378 379