CameraService.cpp revision b36f2df1daf7e733be7c51f93792f8fc4252544c
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_TAG "CameraService" 19 20#include <stdio.h> 21#include <sys/types.h> 22#include <pthread.h> 23 24#include <binder/IPCThreadState.h> 25#include <binder/IServiceManager.h> 26#include <binder/MemoryBase.h> 27#include <binder/MemoryHeapBase.h> 28#include <cutils/atomic.h> 29#include <cutils/properties.h> 30#include <hardware/hardware.h> 31#include <media/AudioSystem.h> 32#include <media/mediaplayer.h> 33#include <surfaceflinger/ISurface.h> 34#include <ui/Overlay.h> 35#include <utils/Errors.h> 36#include <utils/Log.h> 37#include <utils/String16.h> 38 39#include "CameraService.h" 40 41namespace android { 42 43// ---------------------------------------------------------------------------- 44// Logging support -- this is for debugging only 45// Use "adb shell dumpsys media.camera -v 1" to change it. 46static volatile int32_t gLogLevel = 0; 47 48#define LOG1(...) LOGD_IF(gLogLevel >= 1, __VA_ARGS__); 49#define LOG2(...) LOGD_IF(gLogLevel >= 2, __VA_ARGS__); 50 51static void setLogLevel(int level) { 52 android_atomic_write(level, &gLogLevel); 53} 54 55// ---------------------------------------------------------------------------- 56 57static int getCallingPid() { 58 return IPCThreadState::self()->getCallingPid(); 59} 60 61static int getCallingUid() { 62 return IPCThreadState::self()->getCallingUid(); 63} 64 65// ---------------------------------------------------------------------------- 66 67// This is ugly and only safe if we never re-create the CameraService, but 68// should be ok for now. 69static CameraService *gCameraService; 70 71CameraService::CameraService() 72:mSoundRef(0) 73{ 74 LOGI("CameraService started (pid=%d)", getpid()); 75 76 mNumberOfCameras = HAL_getNumberOfCameras(); 77 if (mNumberOfCameras > MAX_CAMERAS) { 78 LOGE("Number of cameras(%d) > MAX_CAMERAS(%d).", 79 mNumberOfCameras, MAX_CAMERAS); 80 mNumberOfCameras = MAX_CAMERAS; 81 } 82 83 for (int i = 0; i < mNumberOfCameras; i++) { 84 setCameraFree(i); 85 } 86 87 gCameraService = this; 88} 89 90CameraService::~CameraService() { 91 for (int i = 0; i < mNumberOfCameras; i++) { 92 if (mBusy[i]) { 93 LOGE("camera %d is still in use in destructor!", i); 94 } 95 } 96 97 gCameraService = NULL; 98} 99 100int32_t CameraService::getNumberOfCameras() { 101 return mNumberOfCameras; 102} 103 104status_t CameraService::getCameraInfo(int cameraId, 105 struct CameraInfo* cameraInfo) { 106 if (cameraId < 0 || cameraId >= mNumberOfCameras) { 107 return BAD_VALUE; 108 } 109 110 HAL_getCameraInfo(cameraId, cameraInfo); 111 return OK; 112} 113 114sp<ICamera> CameraService::connect( 115 const sp<ICameraClient>& cameraClient, int cameraId) { 116 int callingPid = getCallingPid(); 117 LOG1("CameraService::connect E (pid %d, id %d)", callingPid, cameraId); 118 119 sp<Client> client; 120 if (cameraId < 0 || cameraId >= mNumberOfCameras) { 121 LOGE("CameraService::connect X (pid %d) rejected (invalid cameraId %d).", 122 callingPid, cameraId); 123 return NULL; 124 } 125 126 Mutex::Autolock lock(mServiceLock); 127 if (mClient[cameraId] != 0) { 128 client = mClient[cameraId].promote(); 129 if (client != 0) { 130 if (cameraClient->asBinder() == client->getCameraClient()->asBinder()) { 131 LOG1("CameraService::connect X (pid %d) (the same client)", 132 callingPid); 133 return client; 134 } else { 135 LOGW("CameraService::connect X (pid %d) rejected (existing client).", 136 callingPid); 137 return NULL; 138 } 139 } 140 mClient[cameraId].clear(); 141 } 142 143 if (mBusy[cameraId]) { 144 LOGW("CameraService::connect X (pid %d) rejected" 145 " (camera %d is still busy).", callingPid, cameraId); 146 return NULL; 147 } 148 149 sp<CameraHardwareInterface> hardware = HAL_openCameraHardware(cameraId); 150 if (hardware == NULL) { 151 LOGE("Fail to open camera hardware (id=%d)", cameraId); 152 return NULL; 153 } 154 client = new Client(this, cameraClient, hardware, cameraId, callingPid); 155 mClient[cameraId] = client; 156 LOG1("CameraService::connect X"); 157 return client; 158} 159 160void CameraService::removeClient(const sp<ICameraClient>& cameraClient) { 161 int callingPid = getCallingPid(); 162 LOG1("CameraService::removeClient E (pid %d)", callingPid); 163 164 for (int i = 0; i < mNumberOfCameras; i++) { 165 // Declare this before the lock to make absolutely sure the 166 // destructor won't be called with the lock held. 167 sp<Client> client; 168 169 Mutex::Autolock lock(mServiceLock); 170 171 // This happens when we have already disconnected (or this is 172 // just another unused camera). 173 if (mClient[i] == 0) continue; 174 175 // Promote mClient. It can fail if we are called from this path: 176 // Client::~Client() -> disconnect() -> removeClient(). 177 client = mClient[i].promote(); 178 179 if (client == 0) { 180 mClient[i].clear(); 181 continue; 182 } 183 184 if (cameraClient->asBinder() == client->getCameraClient()->asBinder()) { 185 // Found our camera, clear and leave. 186 LOG1("removeClient: clear camera %d", i); 187 mClient[i].clear(); 188 break; 189 } 190 } 191 192 LOG1("CameraService::removeClient X (pid %d)", callingPid); 193} 194 195sp<CameraService::Client> CameraService::getClientById(int cameraId) { 196 if (cameraId < 0 || cameraId >= mNumberOfCameras) return NULL; 197 return mClient[cameraId].promote(); 198} 199 200status_t CameraService::onTransact( 201 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) { 202 // Permission checks 203 switch (code) { 204 case BnCameraService::CONNECT: 205 const int pid = getCallingPid(); 206 const int self_pid = getpid(); 207 if (pid != self_pid) { 208 // we're called from a different process, do the real check 209 if (!checkCallingPermission( 210 String16("android.permission.CAMERA"))) { 211 const int uid = getCallingUid(); 212 LOGE("Permission Denial: " 213 "can't use the camera pid=%d, uid=%d", pid, uid); 214 return PERMISSION_DENIED; 215 } 216 } 217 break; 218 } 219 220 return BnCameraService::onTransact(code, data, reply, flags); 221} 222 223// The reason we need this busy bit is a new CameraService::connect() request 224// may come in while the previous Client's destructor has not been run or is 225// still running. If the last strong reference of the previous Client is gone 226// but the destructor has not been finished, we should not allow the new Client 227// to be created because we need to wait for the previous Client to tear down 228// the hardware first. 229void CameraService::setCameraBusy(int cameraId) { 230 android_atomic_write(1, &mBusy[cameraId]); 231} 232 233void CameraService::setCameraFree(int cameraId) { 234 android_atomic_write(0, &mBusy[cameraId]); 235} 236 237// We share the media players for shutter and recording sound for all clients. 238// A reference count is kept to determine when we will actually release the 239// media players. 240 241static MediaPlayer* newMediaPlayer(const char *file) { 242 MediaPlayer* mp = new MediaPlayer(); 243 if (mp->setDataSource(file, NULL) == NO_ERROR) { 244 mp->setAudioStreamType(AudioSystem::ENFORCED_AUDIBLE); 245 mp->prepare(); 246 } else { 247 LOGE("Failed to load CameraService sounds: %s", file); 248 return NULL; 249 } 250 return mp; 251} 252 253void CameraService::loadSound() { 254 Mutex::Autolock lock(mSoundLock); 255 LOG1("CameraService::loadSound ref=%d", mSoundRef); 256 if (mSoundRef++) return; 257 258 mSoundPlayer[SOUND_SHUTTER] = newMediaPlayer("/system/media/audio/ui/camera_click.ogg"); 259 mSoundPlayer[SOUND_RECORDING] = newMediaPlayer("/system/media/audio/ui/VideoRecord.ogg"); 260} 261 262void CameraService::releaseSound() { 263 Mutex::Autolock lock(mSoundLock); 264 LOG1("CameraService::releaseSound ref=%d", mSoundRef); 265 if (--mSoundRef) return; 266 267 for (int i = 0; i < NUM_SOUNDS; i++) { 268 if (mSoundPlayer[i] != 0) { 269 mSoundPlayer[i]->disconnect(); 270 mSoundPlayer[i].clear(); 271 } 272 } 273} 274 275void CameraService::playSound(sound_kind kind) { 276 LOG1("playSound(%d)", kind); 277 Mutex::Autolock lock(mSoundLock); 278 sp<MediaPlayer> player = mSoundPlayer[kind]; 279 if (player != 0) { 280 // do not play the sound if stream volume is 0 281 // (typically because ringer mode is silent). 282 int index; 283 AudioSystem::getStreamVolumeIndex(AudioSystem::ENFORCED_AUDIBLE, &index); 284 if (index != 0) { 285 player->seekTo(0); 286 player->start(); 287 } 288 } 289} 290 291// ---------------------------------------------------------------------------- 292 293CameraService::Client::Client(const sp<CameraService>& cameraService, 294 const sp<ICameraClient>& cameraClient, 295 const sp<CameraHardwareInterface>& hardware, 296 int cameraId, int clientPid) { 297 int callingPid = getCallingPid(); 298 LOG1("Client::Client E (pid %d)", callingPid); 299 300 mCameraService = cameraService; 301 mCameraClient = cameraClient; 302 mHardware = hardware; 303 mCameraId = cameraId; 304 mClientPid = clientPid; 305 mUseOverlay = mHardware->useOverlay(); 306 mMsgEnabled = 0; 307 308 mHardware->setCallbacks(notifyCallback, 309 dataCallback, 310 dataCallbackTimestamp, 311 (void *)cameraId); 312 313 // Enable zoom, error, and focus messages by default 314 enableMsgType(CAMERA_MSG_ERROR | 315 CAMERA_MSG_ZOOM | 316 CAMERA_MSG_FOCUS); 317 mOverlayW = 0; 318 mOverlayH = 0; 319 320 // Callback is disabled by default 321 mPreviewCallbackFlag = FRAME_CALLBACK_FLAG_NOOP; 322 mOrientation = 0; 323 mOrientationChanged = false; 324 mPlayShutterSound = true; 325 cameraService->setCameraBusy(cameraId); 326 cameraService->loadSound(); 327 LOG1("Client::Client X (pid %d)", callingPid); 328} 329 330static void *unregister_surface(void *arg) { 331 ISurface *surface = (ISurface *)arg; 332 surface->unregisterBuffers(); 333 IPCThreadState::self()->flushCommands(); 334 return NULL; 335} 336 337// tear down the client 338CameraService::Client::~Client() { 339 int callingPid = getCallingPid(); 340 LOG1("Client::~Client E (pid %d, this %p)", callingPid, this); 341 342 // set mClientPid to let disconnet() tear down the hardware 343 mClientPid = callingPid; 344 disconnect(); 345 mCameraService->releaseSound(); 346 LOG1("Client::~Client X (pid %d, this %p)", callingPid, this); 347} 348 349// ---------------------------------------------------------------------------- 350 351status_t CameraService::Client::checkPid() const { 352 int callingPid = getCallingPid(); 353 if (callingPid == mClientPid) return NO_ERROR; 354 355 LOGW("attempt to use a locked camera from a different process" 356 " (old pid %d, new pid %d)", mClientPid, callingPid); 357 return EBUSY; 358} 359 360status_t CameraService::Client::checkPidAndHardware() const { 361 status_t result = checkPid(); 362 if (result != NO_ERROR) return result; 363 if (mHardware == 0) { 364 LOGE("attempt to use a camera after disconnect() (pid %d)", getCallingPid()); 365 return INVALID_OPERATION; 366 } 367 return NO_ERROR; 368} 369 370status_t CameraService::Client::lock() { 371 int callingPid = getCallingPid(); 372 LOG1("lock (pid %d)", callingPid); 373 Mutex::Autolock lock(mLock); 374 375 // lock camera to this client if the the camera is unlocked 376 if (mClientPid == 0) { 377 mClientPid = callingPid; 378 return NO_ERROR; 379 } 380 381 // returns NO_ERROR if the client already owns the camera, EBUSY otherwise 382 return checkPid(); 383} 384 385status_t CameraService::Client::unlock() { 386 int callingPid = getCallingPid(); 387 LOG1("unlock (pid %d)", callingPid); 388 Mutex::Autolock lock(mLock); 389 390 // allow anyone to use camera (after they lock the camera) 391 status_t result = checkPid(); 392 if (result == NO_ERROR) { 393 mClientPid = 0; 394 LOG1("clear mCameraClient (pid %d)", callingPid); 395 // we need to remove the reference to ICameraClient so that when the app 396 // goes away, the reference count goes to 0. 397 mCameraClient.clear(); 398 } 399 return result; 400} 401 402// connect a new client to the camera 403status_t CameraService::Client::connect(const sp<ICameraClient>& client) { 404 int callingPid = getCallingPid(); 405 LOG1("connect E (pid %d)", callingPid); 406 Mutex::Autolock lock(mLock); 407 408 if (mClientPid != 0 && checkPid() != NO_ERROR) { 409 LOGW("Tried to connect to a locked camera (old pid %d, new pid %d)", 410 mClientPid, callingPid); 411 return EBUSY; 412 } 413 414 if (mCameraClient != 0 && (client->asBinder() == mCameraClient->asBinder())) { 415 LOG1("Connect to the same client"); 416 return NO_ERROR; 417 } 418 419 mPreviewCallbackFlag = FRAME_CALLBACK_FLAG_NOOP; 420 mClientPid = callingPid; 421 mCameraClient = client; 422 423 LOG1("connect X (pid %d)", callingPid); 424 return NO_ERROR; 425} 426 427void CameraService::Client::disconnect() { 428 int callingPid = getCallingPid(); 429 LOG1("disconnect E (pid %d)", callingPid); 430 Mutex::Autolock lock(mLock); 431 432 if (checkPid() != NO_ERROR) { 433 LOGW("different client - don't disconnect"); 434 return; 435 } 436 437 if (mClientPid <= 0) { 438 LOG1("camera is unlocked (mClientPid = %d), don't tear down hardware", mClientPid); 439 return; 440 } 441 442 // Make sure disconnect() is done once and once only, whether it is called 443 // from the user directly, or called by the destructor. 444 if (mHardware == 0) return; 445 446 LOG1("hardware teardown"); 447 // Before destroying mHardware, we must make sure it's in the 448 // idle state. 449 // Turn off all messages. 450 disableMsgType(CAMERA_MSG_ALL_MSGS); 451 mHardware->stopPreview(); 452 mHardware->cancelPicture(); 453 // Release the hardware resources. 454 mHardware->release(); 455 // Release the held overlay resources. 456 if (mUseOverlay) { 457 mOverlayRef = 0; 458 } 459 // Release the held ANativeWindow resources. 460 if (mPreviewWindow != 0) { 461 mPreviewWindow = 0; 462 mHardware->setPreviewWindow(mPreviewWindow); 463 } 464 mHardware.clear(); 465 466 mCameraService->removeClient(mCameraClient); 467 mCameraService->setCameraFree(mCameraId); 468 469 LOG1("disconnect X (pid %d)", callingPid); 470} 471 472// ---------------------------------------------------------------------------- 473 474// set the Surface that the preview will use 475status_t CameraService::Client::setPreviewDisplay(const sp<Surface>& surface) { 476 LOG1("setPreviewDisplay(%p) (pid %d)", surface.get(), getCallingPid()); 477 Mutex::Autolock lock(mLock); 478 status_t result = checkPidAndHardware(); 479 if (result != NO_ERROR) return result; 480 481 result = NO_ERROR; 482 483 // return if no change in surface. 484 // asBinder() is safe on NULL (returns NULL) 485 if (getISurface(surface)->asBinder() == mSurface->asBinder()) { 486 return result; 487 } 488 489 if (mSurface != 0) { 490 LOG1("clearing old preview surface %p", mSurface.get()); 491 if (mUseOverlay) { 492 // Force the destruction of any previous overlay 493 sp<Overlay> dummy; 494 mHardware->setOverlay(dummy); 495 mOverlayRef = 0; 496 } 497 } 498 if (surface != 0) { 499 mSurface = getISurface(surface); 500 } else { 501 mSurface = 0; 502 } 503 mPreviewWindow = surface; 504 mOverlayRef = 0; 505 // If preview has been already started, set overlay or register preview 506 // buffers now. 507 if (mHardware->previewEnabled()) { 508 if (mUseOverlay) { 509 result = setOverlay(); 510 } else if (mPreviewWindow != 0) { 511 result = mHardware->setPreviewWindow(mPreviewWindow); 512 } 513 } 514 515 return result; 516} 517 518status_t CameraService::Client::setOverlay() { 519 int w, h; 520 CameraParameters params(mHardware->getParameters()); 521 params.getPreviewSize(&w, &h); 522 523 if (w != mOverlayW || h != mOverlayH || mOrientationChanged) { 524 // Force the destruction of any previous overlay 525 sp<Overlay> dummy; 526 mHardware->setOverlay(dummy); 527 mOverlayRef = 0; 528 mOrientationChanged = false; 529 } 530 531 status_t result = NO_ERROR; 532 if (mSurface == 0) { 533 result = mHardware->setOverlay(NULL); 534 } else { 535 if (mOverlayRef == 0) { 536 // FIXME: 537 // Surfaceflinger may hold onto the previous overlay reference for some 538 // time after we try to destroy it. retry a few times. In the future, we 539 // should make the destroy call block, or possibly specify that we can 540 // wait in the createOverlay call if the previous overlay is in the 541 // process of being destroyed. 542 for (int retry = 0; retry < 50; ++retry) { 543 mOverlayRef = mSurface->createOverlay(w, h, OVERLAY_FORMAT_DEFAULT, 544 mOrientation); 545 if (mOverlayRef != 0) break; 546 LOGW("Overlay create failed - retrying"); 547 usleep(20000); 548 } 549 if (mOverlayRef == 0) { 550 LOGE("Overlay Creation Failed!"); 551 return -EINVAL; 552 } 553 result = mHardware->setOverlay(new Overlay(mOverlayRef)); 554 } 555 } 556 if (result != NO_ERROR) { 557 LOGE("mHardware->setOverlay() failed with status %d\n", result); 558 return result; 559 } 560 561 mOverlayW = w; 562 mOverlayH = h; 563 564 return result; 565} 566 567// set the preview callback flag to affect how the received frames from 568// preview are handled. 569void CameraService::Client::setPreviewCallbackFlag(int callback_flag) { 570 LOG1("setPreviewCallbackFlag(%d) (pid %d)", callback_flag, getCallingPid()); 571 Mutex::Autolock lock(mLock); 572 if (checkPidAndHardware() != NO_ERROR) return; 573 574 mPreviewCallbackFlag = callback_flag; 575 if (mPreviewCallbackFlag & FRAME_CALLBACK_FLAG_ENABLE_MASK) { 576 enableMsgType(CAMERA_MSG_PREVIEW_FRAME); 577 } else { 578 disableMsgType(CAMERA_MSG_PREVIEW_FRAME); 579 } 580} 581 582// start preview mode 583status_t CameraService::Client::startPreview() { 584 LOG1("startPreview (pid %d)", getCallingPid()); 585 return startCameraMode(CAMERA_PREVIEW_MODE); 586} 587 588// start recording mode 589status_t CameraService::Client::startRecording() { 590 LOG1("startRecording (pid %d)", getCallingPid()); 591 return startCameraMode(CAMERA_RECORDING_MODE); 592} 593 594// start preview or recording 595status_t CameraService::Client::startCameraMode(camera_mode mode) { 596 LOG1("startCameraMode(%d)", mode); 597 Mutex::Autolock lock(mLock); 598 status_t result = checkPidAndHardware(); 599 if (result != NO_ERROR) return result; 600 601 switch(mode) { 602 case CAMERA_PREVIEW_MODE: 603 if (mSurface == 0 && mPreviewWindow == 0) { 604 LOG1("mSurface is not set yet."); 605 // still able to start preview in this case. 606 } 607 return startPreviewMode(); 608 case CAMERA_RECORDING_MODE: 609 if (mSurface == 0 && mPreviewWindow == 0) { 610 LOGE("mSurface or mPreviewWindow must be set before startRecordingMode."); 611 return INVALID_OPERATION; 612 } 613 return startRecordingMode(); 614 default: 615 return UNKNOWN_ERROR; 616 } 617} 618 619status_t CameraService::Client::startPreviewMode() { 620 LOG1("startPreviewMode"); 621 status_t result = NO_ERROR; 622 623 // if preview has been enabled, nothing needs to be done 624 if (mHardware->previewEnabled()) { 625 return NO_ERROR; 626 } 627 628 if (mUseOverlay) { 629 // If preview display has been set, set overlay now. 630 if (mSurface != 0) { 631 result = setOverlay(); 632 } 633 if (result != NO_ERROR) return result; 634 result = mHardware->startPreview(); 635 } else { 636 // XXX: Set the orientation of the ANativeWindow. 637 mHardware->setPreviewWindow(mPreviewWindow); 638 result = mHardware->startPreview(); 639 } 640 return result; 641} 642 643status_t CameraService::Client::startRecordingMode() { 644 LOG1("startRecordingMode"); 645 status_t result = NO_ERROR; 646 647 // if recording has been enabled, nothing needs to be done 648 if (mHardware->recordingEnabled()) { 649 return NO_ERROR; 650 } 651 652 // if preview has not been started, start preview first 653 if (!mHardware->previewEnabled()) { 654 result = startPreviewMode(); 655 if (result != NO_ERROR) { 656 return result; 657 } 658 } 659 660 // start recording mode 661 enableMsgType(CAMERA_MSG_VIDEO_FRAME); 662 mCameraService->playSound(SOUND_RECORDING); 663 result = mHardware->startRecording(); 664 if (result != NO_ERROR) { 665 LOGE("mHardware->startRecording() failed with status %d", result); 666 } 667 return result; 668} 669 670// stop preview mode 671void CameraService::Client::stopPreview() { 672 LOG1("stopPreview (pid %d)", getCallingPid()); 673 Mutex::Autolock lock(mLock); 674 if (checkPidAndHardware() != NO_ERROR) return; 675 676 677 disableMsgType(CAMERA_MSG_PREVIEW_FRAME); 678 mHardware->stopPreview(); 679 680 mPreviewBuffer.clear(); 681} 682 683// stop recording mode 684void CameraService::Client::stopRecording() { 685 LOG1("stopRecording (pid %d)", getCallingPid()); 686 Mutex::Autolock lock(mLock); 687 if (checkPidAndHardware() != NO_ERROR) return; 688 689 mCameraService->playSound(SOUND_RECORDING); 690 disableMsgType(CAMERA_MSG_VIDEO_FRAME); 691 mHardware->stopRecording(); 692 693 mPreviewBuffer.clear(); 694} 695 696// release a recording frame 697void CameraService::Client::releaseRecordingFrame(const sp<IMemory>& mem) { 698 Mutex::Autolock lock(mLock); 699 if (checkPidAndHardware() != NO_ERROR) return; 700 mHardware->releaseRecordingFrame(mem); 701} 702 703bool CameraService::Client::previewEnabled() { 704 LOG1("previewEnabled (pid %d)", getCallingPid()); 705 706 Mutex::Autolock lock(mLock); 707 if (checkPidAndHardware() != NO_ERROR) return false; 708 return mHardware->previewEnabled(); 709} 710 711bool CameraService::Client::recordingEnabled() { 712 LOG1("recordingEnabled (pid %d)", getCallingPid()); 713 714 Mutex::Autolock lock(mLock); 715 if (checkPidAndHardware() != NO_ERROR) return false; 716 return mHardware->recordingEnabled(); 717} 718 719status_t CameraService::Client::autoFocus() { 720 LOG1("autoFocus (pid %d)", getCallingPid()); 721 722 Mutex::Autolock lock(mLock); 723 status_t result = checkPidAndHardware(); 724 if (result != NO_ERROR) return result; 725 726 return mHardware->autoFocus(); 727} 728 729status_t CameraService::Client::cancelAutoFocus() { 730 LOG1("cancelAutoFocus (pid %d)", getCallingPid()); 731 732 Mutex::Autolock lock(mLock); 733 status_t result = checkPidAndHardware(); 734 if (result != NO_ERROR) return result; 735 736 return mHardware->cancelAutoFocus(); 737} 738 739// take a picture - image is returned in callback 740status_t CameraService::Client::takePicture() { 741 LOG1("takePicture (pid %d)", getCallingPid()); 742 743 Mutex::Autolock lock(mLock); 744 status_t result = checkPidAndHardware(); 745 if (result != NO_ERROR) return result; 746 747 enableMsgType(CAMERA_MSG_SHUTTER | 748 CAMERA_MSG_POSTVIEW_FRAME | 749 CAMERA_MSG_RAW_IMAGE | 750 CAMERA_MSG_COMPRESSED_IMAGE); 751 752 return mHardware->takePicture(); 753} 754 755// set preview/capture parameters - key/value pairs 756status_t CameraService::Client::setParameters(const String8& params) { 757 LOG1("setParameters (pid %d) (%s)", getCallingPid(), params.string()); 758 759 Mutex::Autolock lock(mLock); 760 status_t result = checkPidAndHardware(); 761 if (result != NO_ERROR) return result; 762 763 CameraParameters p(params); 764 return mHardware->setParameters(p); 765} 766 767// get preview/capture parameters - key/value pairs 768String8 CameraService::Client::getParameters() const { 769 Mutex::Autolock lock(mLock); 770 if (checkPidAndHardware() != NO_ERROR) return String8(); 771 772 String8 params(mHardware->getParameters().flatten()); 773 LOG1("getParameters (pid %d) (%s)", getCallingPid(), params.string()); 774 return params; 775} 776 777// enable shutter sound 778status_t CameraService::Client::enableShutterSound(bool enable) { 779 LOG1("enableShutterSound (pid %d)", getCallingPid()); 780 781 status_t result = checkPidAndHardware(); 782 if (result != NO_ERROR) return result; 783 784 if (enable) { 785 mPlayShutterSound = true; 786 return OK; 787 } 788 789 // Disabling shutter sound may not be allowed. In that case only 790 // allow the mediaserver process to disable the sound. 791 char value[PROPERTY_VALUE_MAX]; 792 property_get("ro.camera.sound.forced", value, "0"); 793 if (strcmp(value, "0") != 0) { 794 // Disabling shutter sound is not allowed. Deny if the current 795 // process is not mediaserver. 796 if (getCallingPid() != getpid()) { 797 LOGE("Failed to disable shutter sound. Permission denied (pid %d)", getCallingPid()); 798 return PERMISSION_DENIED; 799 } 800 } 801 802 mPlayShutterSound = false; 803 return OK; 804} 805 806status_t CameraService::Client::sendCommand(int32_t cmd, int32_t arg1, int32_t arg2) { 807 LOG1("sendCommand (pid %d)", getCallingPid()); 808 int orientation; 809 Mutex::Autolock lock(mLock); 810 status_t result = checkPidAndHardware(); 811 if (result != NO_ERROR) return result; 812 813 if (cmd == CAMERA_CMD_SET_DISPLAY_ORIENTATION) { 814 // The orientation cannot be set during preview. 815 if (mHardware->previewEnabled()) { 816 return INVALID_OPERATION; 817 } 818 switch (arg1) { 819 case 0: 820 orientation = ISurface::BufferHeap::ROT_0; 821 break; 822 case 90: 823 orientation = ISurface::BufferHeap::ROT_90; 824 break; 825 case 180: 826 orientation = ISurface::BufferHeap::ROT_180; 827 break; 828 case 270: 829 orientation = ISurface::BufferHeap::ROT_270; 830 break; 831 default: 832 return BAD_VALUE; 833 } 834 if (mOrientation != orientation) { 835 mOrientation = orientation; 836 if (mOverlayRef != 0) mOrientationChanged = true; 837 } 838 return OK; 839 } else if (cmd == CAMERA_CMD_ENABLE_SHUTTER_SOUND) { 840 switch (arg1) { 841 case 0: 842 enableShutterSound(false); 843 break; 844 case 1: 845 enableShutterSound(true); 846 break; 847 default: 848 return BAD_VALUE; 849 } 850 return OK; 851 } else if (cmd == CAMERA_CMD_PLAY_RECORDING_SOUND) { 852 mCameraService->playSound(SOUND_RECORDING); 853 } 854 855 return mHardware->sendCommand(cmd, arg1, arg2); 856} 857 858// ---------------------------------------------------------------------------- 859 860void CameraService::Client::enableMsgType(int32_t msgType) { 861 android_atomic_or(msgType, &mMsgEnabled); 862 mHardware->enableMsgType(msgType); 863} 864 865void CameraService::Client::disableMsgType(int32_t msgType) { 866 android_atomic_and(~msgType, &mMsgEnabled); 867 mHardware->disableMsgType(msgType); 868} 869 870#define CHECK_MESSAGE_INTERVAL 10 // 10ms 871bool CameraService::Client::lockIfMessageWanted(int32_t msgType) { 872 int sleepCount = 0; 873 while (mMsgEnabled & msgType) { 874 if (mLock.tryLock() == NO_ERROR) { 875 if (sleepCount > 0) { 876 LOG1("lockIfMessageWanted(%d): waited for %d ms", 877 msgType, sleepCount * CHECK_MESSAGE_INTERVAL); 878 } 879 return true; 880 } 881 if (sleepCount++ == 0) { 882 LOG1("lockIfMessageWanted(%d): enter sleep", msgType); 883 } 884 usleep(CHECK_MESSAGE_INTERVAL * 1000); 885 } 886 LOGW("lockIfMessageWanted(%d): dropped unwanted message", msgType); 887 return false; 888} 889 890// ---------------------------------------------------------------------------- 891 892// Converts from a raw pointer to the client to a strong pointer during a 893// hardware callback. This requires the callbacks only happen when the client 894// is still alive. 895sp<CameraService::Client> CameraService::Client::getClientFromCookie(void* user) { 896 sp<Client> client = gCameraService->getClientById((int) user); 897 898 // This could happen if the Client is in the process of shutting down (the 899 // last strong reference is gone, but the destructor hasn't finished 900 // stopping the hardware). 901 if (client == 0) return NULL; 902 903 // The checks below are not necessary and are for debugging only. 904 if (client->mCameraService.get() != gCameraService) { 905 LOGE("mismatch service!"); 906 return NULL; 907 } 908 909 if (client->mHardware == 0) { 910 LOGE("mHardware == 0: callback after disconnect()?"); 911 return NULL; 912 } 913 914 return client; 915} 916 917// Callback messages can be dispatched to internal handlers or pass to our 918// client's callback functions, depending on the message type. 919// 920// notifyCallback: 921// CAMERA_MSG_SHUTTER handleShutter 922// (others) c->notifyCallback 923// dataCallback: 924// CAMERA_MSG_PREVIEW_FRAME handlePreviewData 925// CAMERA_MSG_POSTVIEW_FRAME handlePostview 926// CAMERA_MSG_RAW_IMAGE handleRawPicture 927// CAMERA_MSG_COMPRESSED_IMAGE handleCompressedPicture 928// (others) c->dataCallback 929// dataCallbackTimestamp 930// (others) c->dataCallbackTimestamp 931// 932// NOTE: the *Callback functions grab mLock of the client before passing 933// control to handle* functions. So the handle* functions must release the 934// lock before calling the ICameraClient's callbacks, so those callbacks can 935// invoke methods in the Client class again (For example, the preview frame 936// callback may want to releaseRecordingFrame). The handle* functions must 937// release the lock after all accesses to member variables, so it must be 938// handled very carefully. 939 940void CameraService::Client::notifyCallback(int32_t msgType, int32_t ext1, 941 int32_t ext2, void* user) { 942 LOG2("notifyCallback(%d)", msgType); 943 944 sp<Client> client = getClientFromCookie(user); 945 if (client == 0) return; 946 if (!client->lockIfMessageWanted(msgType)) return; 947 948 switch (msgType) { 949 case CAMERA_MSG_SHUTTER: 950 // ext1 is the dimension of the yuv picture. 951 client->handleShutter((image_rect_type *)ext1); 952 break; 953 default: 954 client->handleGenericNotify(msgType, ext1, ext2); 955 break; 956 } 957} 958 959void CameraService::Client::dataCallback(int32_t msgType, 960 const sp<IMemory>& dataPtr, void* user) { 961 LOG2("dataCallback(%d)", msgType); 962 963 sp<Client> client = getClientFromCookie(user); 964 if (client == 0) return; 965 if (!client->lockIfMessageWanted(msgType)) return; 966 967 if (dataPtr == 0) { 968 LOGE("Null data returned in data callback"); 969 client->handleGenericNotify(CAMERA_MSG_ERROR, UNKNOWN_ERROR, 0); 970 return; 971 } 972 973 switch (msgType) { 974 case CAMERA_MSG_PREVIEW_FRAME: 975 client->handlePreviewData(dataPtr); 976 break; 977 case CAMERA_MSG_POSTVIEW_FRAME: 978 client->handlePostview(dataPtr); 979 break; 980 case CAMERA_MSG_RAW_IMAGE: 981 client->handleRawPicture(dataPtr); 982 break; 983 case CAMERA_MSG_COMPRESSED_IMAGE: 984 client->handleCompressedPicture(dataPtr); 985 break; 986 default: 987 client->handleGenericData(msgType, dataPtr); 988 break; 989 } 990} 991 992void CameraService::Client::dataCallbackTimestamp(nsecs_t timestamp, 993 int32_t msgType, const sp<IMemory>& dataPtr, void* user) { 994 LOG2("dataCallbackTimestamp(%d)", msgType); 995 996 sp<Client> client = getClientFromCookie(user); 997 if (client == 0) return; 998 if (!client->lockIfMessageWanted(msgType)) return; 999 1000 if (dataPtr == 0) { 1001 LOGE("Null data returned in data with timestamp callback"); 1002 client->handleGenericNotify(CAMERA_MSG_ERROR, UNKNOWN_ERROR, 0); 1003 return; 1004 } 1005 1006 client->handleGenericDataTimestamp(timestamp, msgType, dataPtr); 1007} 1008 1009// snapshot taken callback 1010// "size" is the width and height of yuv picture for registerBuffer. 1011// If it is NULL, use the picture size from parameters. 1012void CameraService::Client::handleShutter(image_rect_type *size) { 1013 if (mPlayShutterSound) { 1014 mCameraService->playSound(SOUND_SHUTTER); 1015 } 1016 1017 sp<ICameraClient> c = mCameraClient; 1018 if (c != 0) { 1019 mLock.unlock(); 1020 c->notifyCallback(CAMERA_MSG_SHUTTER, 0, 0); 1021 if (!lockIfMessageWanted(CAMERA_MSG_SHUTTER)) return; 1022 } 1023 disableMsgType(CAMERA_MSG_SHUTTER); 1024 1025 // It takes some time before yuvPicture callback to be called. 1026 // Register the buffer for raw image here to reduce latency. 1027 if (mSurface != 0 && !mUseOverlay) { 1028 int w, h; 1029 CameraParameters params(mHardware->getParameters()); 1030 if (size == NULL) { 1031 params.getPictureSize(&w, &h); 1032 } else { 1033 w = size->width; 1034 h = size->height; 1035 w &= ~1; 1036 h &= ~1; 1037 LOG1("Snapshot image width=%d, height=%d", w, h); 1038 } 1039 // FIXME: don't use hardcoded format constants here 1040 ISurface::BufferHeap buffers(w, h, w, h, 1041 HAL_PIXEL_FORMAT_YCrCb_420_SP, mOrientation, 0, 1042 mHardware->getRawHeap()); 1043 1044 IPCThreadState::self()->flushCommands(); 1045 } 1046 1047 mLock.unlock(); 1048} 1049 1050// preview callback - frame buffer update 1051void CameraService::Client::handlePreviewData(const sp<IMemory>& mem) { 1052 ssize_t offset; 1053 size_t size; 1054 sp<IMemoryHeap> heap = mem->getMemory(&offset, &size); 1055 1056 // local copy of the callback flags 1057 int flags = mPreviewCallbackFlag; 1058 1059 // is callback enabled? 1060 if (!(flags & FRAME_CALLBACK_FLAG_ENABLE_MASK)) { 1061 // If the enable bit is off, the copy-out and one-shot bits are ignored 1062 LOG2("frame callback is disabled"); 1063 mLock.unlock(); 1064 return; 1065 } 1066 1067 // hold a strong pointer to the client 1068 sp<ICameraClient> c = mCameraClient; 1069 1070 // clear callback flags if no client or one-shot mode 1071 if (c == 0 || (mPreviewCallbackFlag & FRAME_CALLBACK_FLAG_ONE_SHOT_MASK)) { 1072 LOG2("Disable preview callback"); 1073 mPreviewCallbackFlag &= ~(FRAME_CALLBACK_FLAG_ONE_SHOT_MASK | 1074 FRAME_CALLBACK_FLAG_COPY_OUT_MASK | 1075 FRAME_CALLBACK_FLAG_ENABLE_MASK); 1076 disableMsgType(CAMERA_MSG_PREVIEW_FRAME); 1077 } 1078 1079 if (c != 0) { 1080 // Is the received frame copied out or not? 1081 if (flags & FRAME_CALLBACK_FLAG_COPY_OUT_MASK) { 1082 LOG2("frame is copied"); 1083 copyFrameAndPostCopiedFrame(c, heap, offset, size); 1084 } else { 1085 LOG2("frame is forwarded"); 1086 mLock.unlock(); 1087 c->dataCallback(CAMERA_MSG_PREVIEW_FRAME, mem); 1088 } 1089 } else { 1090 mLock.unlock(); 1091 } 1092} 1093 1094// picture callback - postview image ready 1095void CameraService::Client::handlePostview(const sp<IMemory>& mem) { 1096 disableMsgType(CAMERA_MSG_POSTVIEW_FRAME); 1097 1098 sp<ICameraClient> c = mCameraClient; 1099 mLock.unlock(); 1100 if (c != 0) { 1101 c->dataCallback(CAMERA_MSG_POSTVIEW_FRAME, mem); 1102 } 1103} 1104 1105// picture callback - raw image ready 1106void CameraService::Client::handleRawPicture(const sp<IMemory>& mem) { 1107 disableMsgType(CAMERA_MSG_RAW_IMAGE); 1108 1109 ssize_t offset; 1110 size_t size; 1111 sp<IMemoryHeap> heap = mem->getMemory(&offset, &size); 1112 1113 sp<ICameraClient> c = mCameraClient; 1114 mLock.unlock(); 1115 if (c != 0) { 1116 c->dataCallback(CAMERA_MSG_RAW_IMAGE, mem); 1117 } 1118} 1119 1120// picture callback - compressed picture ready 1121void CameraService::Client::handleCompressedPicture(const sp<IMemory>& mem) { 1122 disableMsgType(CAMERA_MSG_COMPRESSED_IMAGE); 1123 1124 sp<ICameraClient> c = mCameraClient; 1125 mLock.unlock(); 1126 if (c != 0) { 1127 c->dataCallback(CAMERA_MSG_COMPRESSED_IMAGE, mem); 1128 } 1129} 1130 1131 1132void CameraService::Client::handleGenericNotify(int32_t msgType, 1133 int32_t ext1, int32_t ext2) { 1134 sp<ICameraClient> c = mCameraClient; 1135 mLock.unlock(); 1136 if (c != 0) { 1137 c->notifyCallback(msgType, ext1, ext2); 1138 } 1139} 1140 1141void CameraService::Client::handleGenericData(int32_t msgType, 1142 const sp<IMemory>& dataPtr) { 1143 sp<ICameraClient> c = mCameraClient; 1144 mLock.unlock(); 1145 if (c != 0) { 1146 c->dataCallback(msgType, dataPtr); 1147 } 1148} 1149 1150void CameraService::Client::handleGenericDataTimestamp(nsecs_t timestamp, 1151 int32_t msgType, const sp<IMemory>& dataPtr) { 1152 sp<ICameraClient> c = mCameraClient; 1153 mLock.unlock(); 1154 if (c != 0) { 1155 c->dataCallbackTimestamp(timestamp, msgType, dataPtr); 1156 } 1157} 1158 1159void CameraService::Client::copyFrameAndPostCopiedFrame( 1160 const sp<ICameraClient>& client, const sp<IMemoryHeap>& heap, 1161 size_t offset, size_t size) { 1162 LOG2("copyFrameAndPostCopiedFrame"); 1163 // It is necessary to copy out of pmem before sending this to 1164 // the callback. For efficiency, reuse the same MemoryHeapBase 1165 // provided it's big enough. Don't allocate the memory or 1166 // perform the copy if there's no callback. 1167 // hold the preview lock while we grab a reference to the preview buffer 1168 sp<MemoryHeapBase> previewBuffer; 1169 1170 if (mPreviewBuffer == 0) { 1171 mPreviewBuffer = new MemoryHeapBase(size, 0, NULL); 1172 } else if (size > mPreviewBuffer->virtualSize()) { 1173 mPreviewBuffer.clear(); 1174 mPreviewBuffer = new MemoryHeapBase(size, 0, NULL); 1175 } 1176 if (mPreviewBuffer == 0) { 1177 LOGE("failed to allocate space for preview buffer"); 1178 mLock.unlock(); 1179 return; 1180 } 1181 previewBuffer = mPreviewBuffer; 1182 1183 memcpy(previewBuffer->base(), (uint8_t *)heap->base() + offset, size); 1184 1185 sp<MemoryBase> frame = new MemoryBase(previewBuffer, 0, size); 1186 if (frame == 0) { 1187 LOGE("failed to allocate space for frame callback"); 1188 mLock.unlock(); 1189 return; 1190 } 1191 1192 mLock.unlock(); 1193 client->dataCallback(CAMERA_MSG_PREVIEW_FRAME, frame); 1194} 1195 1196// ---------------------------------------------------------------------------- 1197 1198static const int kDumpLockRetries = 50; 1199static const int kDumpLockSleep = 60000; 1200 1201static bool tryLock(Mutex& mutex) 1202{ 1203 bool locked = false; 1204 for (int i = 0; i < kDumpLockRetries; ++i) { 1205 if (mutex.tryLock() == NO_ERROR) { 1206 locked = true; 1207 break; 1208 } 1209 usleep(kDumpLockSleep); 1210 } 1211 return locked; 1212} 1213 1214status_t CameraService::dump(int fd, const Vector<String16>& args) { 1215 static const char* kDeadlockedString = "CameraService may be deadlocked\n"; 1216 1217 const size_t SIZE = 256; 1218 char buffer[SIZE]; 1219 String8 result; 1220 if (checkCallingPermission(String16("android.permission.DUMP")) == false) { 1221 snprintf(buffer, SIZE, "Permission Denial: " 1222 "can't dump CameraService from pid=%d, uid=%d\n", 1223 getCallingPid(), 1224 getCallingUid()); 1225 result.append(buffer); 1226 write(fd, result.string(), result.size()); 1227 } else { 1228 bool locked = tryLock(mServiceLock); 1229 // failed to lock - CameraService is probably deadlocked 1230 if (!locked) { 1231 String8 result(kDeadlockedString); 1232 write(fd, result.string(), result.size()); 1233 } 1234 1235 bool hasClient = false; 1236 for (int i = 0; i < mNumberOfCameras; i++) { 1237 sp<Client> client = mClient[i].promote(); 1238 if (client == 0) continue; 1239 hasClient = true; 1240 sprintf(buffer, "Client[%d] (%p) PID: %d\n", 1241 i, 1242 client->getCameraClient()->asBinder().get(), 1243 client->mClientPid); 1244 result.append(buffer); 1245 write(fd, result.string(), result.size()); 1246 client->mHardware->dump(fd, args); 1247 } 1248 if (!hasClient) { 1249 result.append("No camera client yet.\n"); 1250 write(fd, result.string(), result.size()); 1251 } 1252 1253 if (locked) mServiceLock.unlock(); 1254 1255 // change logging level 1256 int n = args.size(); 1257 for (int i = 0; i + 1 < n; i++) { 1258 if (args[i] == String16("-v")) { 1259 String8 levelStr(args[i+1]); 1260 int level = atoi(levelStr.string()); 1261 sprintf(buffer, "Set Log Level to %d", level); 1262 result.append(buffer); 1263 setLogLevel(level); 1264 } 1265 } 1266 } 1267 return NO_ERROR; 1268} 1269 1270sp<ISurface> CameraService::getISurface(const sp<Surface>& surface) { 1271 if (surface != 0) { 1272 return surface->getISurface(); 1273 } else { 1274 return sp<ISurface>(0); 1275 } 1276} 1277 1278}; // namespace android 1279