Camera.cpp revision bfa33aae4f54c0020a0568b16a3acb7b30b6ca3d
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 return c; 84 } 85 return 0; 86} 87 88void Camera::init() 89{ 90 mStatus = UNKNOWN_ERROR; 91} 92 93Camera::~Camera() 94{ 95 // We don't need to call disconnect() here because if the CameraService 96 // thinks we are the owner of the hardware, it will hold a (strong) 97 // reference to us, and we can't possibly be here. We also don't want to 98 // call disconnect() here if we are in the same process as mediaserver, 99 // because we may be invoked by CameraService::Client::connect() and will 100 // deadlock if we call any method of ICamera here. 101} 102 103int32_t Camera::getNumberOfCameras() 104{ 105 const sp<ICameraService>& cs = getCameraService(); 106 if (cs == 0) return 0; 107 return cs->getNumberOfCameras(); 108} 109 110status_t Camera::getCameraInfo(int cameraId, 111 struct CameraInfo* cameraInfo) { 112 const sp<ICameraService>& cs = getCameraService(); 113 if (cs == 0) return UNKNOWN_ERROR; 114 return cs->getCameraInfo(cameraId, cameraInfo); 115} 116 117sp<Camera> Camera::connect(int cameraId) 118{ 119 LOGV("connect"); 120 sp<Camera> c = new Camera(); 121 const sp<ICameraService>& cs = getCameraService(); 122 if (cs != 0) { 123 c->mCamera = cs->connect(c, cameraId); 124 } 125 if (c->mCamera != 0) { 126 c->mCamera->asBinder()->linkToDeath(c); 127 c->mStatus = NO_ERROR; 128 } else { 129 c.clear(); 130 } 131 return c; 132} 133 134void Camera::disconnect() 135{ 136 LOGV("disconnect"); 137 if (mCamera != 0) { 138 mCamera->disconnect(); 139 mCamera->asBinder()->unlinkToDeath(this); 140 mCamera = 0; 141 } 142} 143 144status_t Camera::reconnect() 145{ 146 LOGV("reconnect"); 147 sp <ICamera> c = mCamera; 148 if (c == 0) return NO_INIT; 149 return c->connect(this); 150} 151 152sp<ICamera> Camera::remote() 153{ 154 return mCamera; 155} 156 157status_t Camera::lock() 158{ 159 sp <ICamera> c = mCamera; 160 if (c == 0) return NO_INIT; 161 return c->lock(); 162} 163 164status_t Camera::unlock() 165{ 166 sp <ICamera> c = mCamera; 167 if (c == 0) return NO_INIT; 168 return c->unlock(); 169} 170 171// pass the buffered Surface to the camera service 172status_t Camera::setPreviewDisplay(const sp<Surface>& surface) 173{ 174 LOGV("setPreviewDisplay(%p)", surface.get()); 175 sp <ICamera> c = mCamera; 176 if (c == 0) return NO_INIT; 177 if (surface != 0) { 178 return c->setPreviewDisplay(surface); 179 } else { 180 LOGD("app passed NULL surface"); 181 return c->setPreviewDisplay(0); 182 } 183} 184 185// pass the buffered ISurfaceTexture to the camera service 186status_t Camera::setPreviewTexture(const sp<ISurfaceTexture>& surfaceTexture) 187{ 188 LOGV("setPreviewTexture(%p)", surfaceTexture.get()); 189 sp <ICamera> c = mCamera; 190 if (c == 0) return NO_INIT; 191 if (surfaceTexture != 0) { 192 return c->setPreviewTexture(surfaceTexture); 193 } else { 194 LOGD("app passed NULL surface"); 195 return c->setPreviewTexture(0); 196 } 197} 198 199// start preview mode 200status_t Camera::startPreview() 201{ 202 LOGV("startPreview"); 203 sp <ICamera> c = mCamera; 204 if (c == 0) return NO_INIT; 205 return c->startPreview(); 206} 207 208int32_t Camera::getNumberOfVideoBuffers() const 209{ 210 LOGV("getNumberOfVideoBuffers"); 211 sp <ICamera> c = mCamera; 212 if (c == 0) return 0; 213 return c->getNumberOfVideoBuffers(); 214} 215 216sp<IMemory> Camera::getVideoBuffer(int32_t index) const 217{ 218 LOGV("getVideoBuffer: %d", index); 219 sp <ICamera> c = mCamera; 220 if (c == 0) return 0; 221 return c->getVideoBuffer(index); 222} 223 224status_t Camera::storeMetaDataInBuffers(bool enabled) 225{ 226 LOGV("storeMetaDataInBuffers: %s", 227 enabled? "true": "false"); 228 sp <ICamera> c = mCamera; 229 if (c == 0) return NO_INIT; 230 return c->storeMetaDataInBuffers(enabled); 231} 232 233// start recording mode, must call setPreviewDisplay first 234status_t Camera::startRecording() 235{ 236 LOGV("startRecording"); 237 sp <ICamera> c = mCamera; 238 if (c == 0) return NO_INIT; 239 return c->startRecording(); 240} 241 242// stop preview mode 243void Camera::stopPreview() 244{ 245 LOGV("stopPreview"); 246 sp <ICamera> c = mCamera; 247 if (c == 0) return; 248 c->stopPreview(); 249} 250 251// stop recording mode 252void Camera::stopRecording() 253{ 254 LOGV("stopRecording"); 255 sp <ICamera> c = mCamera; 256 if (c == 0) return; 257 c->stopRecording(); 258} 259 260// release a recording frame 261void Camera::releaseRecordingFrame(const sp<IMemory>& mem) 262{ 263 LOGV("releaseRecordingFrame"); 264 sp <ICamera> c = mCamera; 265 if (c == 0) return; 266 c->releaseRecordingFrame(mem); 267} 268 269// get preview state 270bool Camera::previewEnabled() 271{ 272 LOGV("previewEnabled"); 273 sp <ICamera> c = mCamera; 274 if (c == 0) return false; 275 return c->previewEnabled(); 276} 277 278// get recording state 279bool Camera::recordingEnabled() 280{ 281 LOGV("recordingEnabled"); 282 sp <ICamera> c = mCamera; 283 if (c == 0) return false; 284 return c->recordingEnabled(); 285} 286 287status_t Camera::autoFocus() 288{ 289 LOGV("autoFocus"); 290 sp <ICamera> c = mCamera; 291 if (c == 0) return NO_INIT; 292 return c->autoFocus(); 293} 294 295status_t Camera::cancelAutoFocus() 296{ 297 LOGV("cancelAutoFocus"); 298 sp <ICamera> c = mCamera; 299 if (c == 0) return NO_INIT; 300 return c->cancelAutoFocus(); 301} 302 303// take a picture 304status_t Camera::takePicture() 305{ 306 LOGV("takePicture"); 307 sp <ICamera> c = mCamera; 308 if (c == 0) return NO_INIT; 309 return c->takePicture(); 310} 311 312// set preview/capture parameters - key/value pairs 313status_t Camera::setParameters(const String8& params) 314{ 315 LOGV("setParameters"); 316 sp <ICamera> c = mCamera; 317 if (c == 0) return NO_INIT; 318 return c->setParameters(params); 319} 320 321// get preview/capture parameters - key/value pairs 322String8 Camera::getParameters() const 323{ 324 LOGV("getParameters"); 325 String8 params; 326 sp <ICamera> c = mCamera; 327 if (c != 0) params = mCamera->getParameters(); 328 return params; 329} 330 331// send command to camera driver 332status_t Camera::sendCommand(int32_t cmd, int32_t arg1, int32_t arg2) 333{ 334 LOGV("sendCommand"); 335 sp <ICamera> c = mCamera; 336 if (c == 0) return NO_INIT; 337 return c->sendCommand(cmd, arg1, arg2); 338} 339 340void Camera::setListener(const sp<CameraListener>& listener) 341{ 342 Mutex::Autolock _l(mLock); 343 mListener = listener; 344} 345 346void Camera::setPreviewCallbackFlags(int flag) 347{ 348 LOGV("setPreviewCallbackFlags"); 349 sp <ICamera> c = mCamera; 350 if (c == 0) return; 351 mCamera->setPreviewCallbackFlag(flag); 352} 353 354// callback from camera service 355void Camera::notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2) 356{ 357 sp<CameraListener> listener; 358 { 359 Mutex::Autolock _l(mLock); 360 listener = mListener; 361 } 362 if (listener != NULL) { 363 listener->notify(msgType, ext1, ext2); 364 } 365} 366 367// callback from camera service when frame or image is ready 368void Camera::dataCallback(int32_t msgType, const sp<IMemory>& dataPtr) 369{ 370 sp<CameraListener> listener; 371 { 372 Mutex::Autolock _l(mLock); 373 listener = mListener; 374 } 375 if (listener != NULL) { 376 listener->postData(msgType, dataPtr); 377 } 378} 379 380// callback from camera service when timestamped frame is ready 381void Camera::dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr) 382{ 383 sp<CameraListener> listener; 384 { 385 Mutex::Autolock _l(mLock); 386 listener = mListener; 387 } 388 if (listener != NULL) { 389 listener->postDataTimestamp(timestamp, msgType, dataPtr); 390 } else { 391 LOGW("No listener was set. Drop a recording frame."); 392 releaseRecordingFrame(dataPtr); 393 } 394} 395 396void Camera::binderDied(const wp<IBinder>& who) { 397 LOGW("ICamera died"); 398 notifyCallback(CAMERA_MSG_ERROR, CAMERA_ERROR_SERVER_DIED, 0); 399} 400 401void Camera::DeathNotifier::binderDied(const wp<IBinder>& who) { 402 LOGV("binderDied"); 403 Mutex::Autolock _l(Camera::mLock); 404 Camera::mCameraService.clear(); 405 LOGW("Camera server died!"); 406} 407 408}; // namespace android 409