CameraService.cpp revision 0667de7038238c31af77865eb6d83c5ae9ca1b1e
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 <hardware/hardware.h> 30#include <media/AudioSystem.h> 31#include <media/mediaplayer.h> 32#include <surfaceflinger/ISurface.h> 33#include <ui/Overlay.h> 34#include <utils/Errors.h> 35#include <utils/Log.h> 36#include <utils/String16.h> 37 38#include "CameraService.h" 39 40namespace android { 41 42// ---------------------------------------------------------------------------- 43// Logging support -- this is for debugging only 44// Use "adb shell dumpsys media.camera -v 1" to change it. 45static volatile int32_t gLogLevel = 0; 46 47#define LOG1(...) LOGD_IF(gLogLevel >= 1, __VA_ARGS__); 48#define LOG2(...) LOGD_IF(gLogLevel >= 2, __VA_ARGS__); 49 50static void setLogLevel(int level) { 51 android_atomic_write(level, &gLogLevel); 52} 53 54// ---------------------------------------------------------------------------- 55 56static int getCallingPid() { 57 return IPCThreadState::self()->getCallingPid(); 58} 59 60static int getCallingUid() { 61 return IPCThreadState::self()->getCallingUid(); 62} 63 64// ---------------------------------------------------------------------------- 65 66// This is ugly and only safe if we never re-create the CameraService, but 67// should be ok for now. 68static CameraService *gCameraService; 69 70CameraService::CameraService() 71:mSoundRef(0) 72{ 73 LOGI("CameraService started (pid=%d)", getpid()); 74 75 mNumberOfCameras = HAL_getNumberOfCameras(); 76 if (mNumberOfCameras > MAX_CAMERAS) { 77 LOGE("Number of cameras(%d) > MAX_CAMERAS(%d).", 78 mNumberOfCameras, MAX_CAMERAS); 79 mNumberOfCameras = MAX_CAMERAS; 80 } 81 82 for (int i = 0; i < mNumberOfCameras; i++) { 83 setCameraFree(i); 84 } 85 86 gCameraService = this; 87} 88 89CameraService::~CameraService() { 90 for (int i = 0; i < mNumberOfCameras; i++) { 91 if (mBusy[i]) { 92 LOGE("camera %d is still in use in destructor!", i); 93 } 94 } 95 96 gCameraService = NULL; 97} 98 99int32_t CameraService::getNumberOfCameras() { 100 return mNumberOfCameras; 101} 102 103status_t CameraService::getCameraInfo(int cameraId, 104 struct CameraInfo* cameraInfo) { 105 if (cameraId < 0 || cameraId >= mNumberOfCameras) { 106 return BAD_VALUE; 107 } 108 109 HAL_getCameraInfo(cameraId, cameraInfo); 110 return OK; 111} 112 113sp<ICamera> CameraService::connect( 114 const sp<ICameraClient>& cameraClient, int cameraId) { 115 int callingPid = getCallingPid(); 116 LOG1("CameraService::connect E (pid %d, id %d)", callingPid, cameraId); 117 118 sp<Client> client; 119 if (cameraId < 0 || cameraId >= mNumberOfCameras) { 120 LOGE("CameraService::connect X (pid %d) rejected (invalid cameraId %d).", 121 callingPid, cameraId); 122 return NULL; 123 } 124 125 Mutex::Autolock lock(mServiceLock); 126 if (mClient[cameraId] != 0) { 127 client = mClient[cameraId].promote(); 128 if (client != 0) { 129 if (cameraClient->asBinder() == client->getCameraClient()->asBinder()) { 130 LOG1("CameraService::connect X (pid %d) (the same client)", 131 callingPid); 132 return client; 133 } else { 134 LOGW("CameraService::connect X (pid %d) rejected (existing client).", 135 callingPid); 136 return NULL; 137 } 138 } 139 mClient[cameraId].clear(); 140 } 141 142 if (mBusy[cameraId]) { 143 LOGW("CameraService::connect X (pid %d) rejected" 144 " (camera %d is still busy).", callingPid, cameraId); 145 return NULL; 146 } 147 148 sp<CameraHardwareInterface> hardware = HAL_openCameraHardware(cameraId); 149 if (hardware == NULL) { 150 LOGE("Fail to open camera hardware (id=%d)", cameraId); 151 return NULL; 152 } 153 client = new Client(this, cameraClient, hardware, cameraId, callingPid); 154 mClient[cameraId] = client; 155 LOG1("CameraService::connect X"); 156 return client; 157} 158 159void CameraService::removeClient(const sp<ICameraClient>& cameraClient) { 160 int callingPid = getCallingPid(); 161 LOG1("CameraService::removeClient E (pid %d)", callingPid); 162 163 for (int i = 0; i < mNumberOfCameras; i++) { 164 // Declare this before the lock to make absolutely sure the 165 // destructor won't be called with the lock held. 166 sp<Client> client; 167 168 Mutex::Autolock lock(mServiceLock); 169 170 // This happens when we have already disconnected (or this is 171 // just another unused camera). 172 if (mClient[i] == 0) continue; 173 174 // Promote mClient. It can fail if we are called from this path: 175 // Client::~Client() -> disconnect() -> removeClient(). 176 client = mClient[i].promote(); 177 178 if (client == 0) { 179 mClient[i].clear(); 180 continue; 181 } 182 183 if (cameraClient->asBinder() == client->getCameraClient()->asBinder()) { 184 // Found our camera, clear and leave. 185 LOG1("removeClient: clear camera %d", i); 186 mClient[i].clear(); 187 break; 188 } 189 } 190 191 LOG1("CameraService::removeClient X (pid %d)", callingPid); 192} 193 194sp<CameraService::Client> CameraService::getClientById(int cameraId) { 195 if (cameraId < 0 || cameraId >= mNumberOfCameras) return NULL; 196 return mClient[cameraId].promote(); 197} 198 199status_t CameraService::onTransact( 200 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) { 201 // Permission checks 202 switch (code) { 203 case BnCameraService::CONNECT: 204 const int pid = getCallingPid(); 205 const int self_pid = getpid(); 206 if (pid != self_pid) { 207 // we're called from a different process, do the real check 208 if (!checkCallingPermission( 209 String16("android.permission.CAMERA"))) { 210 const int uid = getCallingUid(); 211 LOGE("Permission Denial: " 212 "can't use the camera pid=%d, uid=%d", pid, uid); 213 return PERMISSION_DENIED; 214 } 215 } 216 break; 217 } 218 219 return BnCameraService::onTransact(code, data, reply, flags); 220} 221 222// The reason we need this busy bit is a new CameraService::connect() request 223// may come in while the previous Client's destructor has not been run or is 224// still running. If the last strong reference of the previous Client is gone 225// but the destructor has not been finished, we should not allow the new Client 226// to be created because we need to wait for the previous Client to tear down 227// the hardware first. 228void CameraService::setCameraBusy(int cameraId) { 229 android_atomic_write(1, &mBusy[cameraId]); 230} 231 232void CameraService::setCameraFree(int cameraId) { 233 android_atomic_write(0, &mBusy[cameraId]); 234} 235 236// We share the media players for shutter and recording sound for all clients. 237// A reference count is kept to determine when we will actually release the 238// media players. 239 240static MediaPlayer* newMediaPlayer(const char *file) { 241 MediaPlayer* mp = new MediaPlayer(); 242 if (mp->setDataSource(file, NULL) == NO_ERROR) { 243 mp->setAudioStreamType(AudioSystem::ENFORCED_AUDIBLE); 244 mp->prepare(); 245 } else { 246 LOGE("Failed to load CameraService sounds: %s", file); 247 return NULL; 248 } 249 return mp; 250} 251 252void CameraService::loadSound() { 253 Mutex::Autolock lock(mSoundLock); 254 LOG1("CameraService::loadSound ref=%d", mSoundRef); 255 if (mSoundRef++) return; 256 257 mSoundPlayer[SOUND_SHUTTER] = newMediaPlayer("/system/media/audio/ui/camera_click.ogg"); 258 mSoundPlayer[SOUND_RECORDING] = newMediaPlayer("/system/media/audio/ui/VideoRecord.ogg"); 259} 260 261void CameraService::releaseSound() { 262 Mutex::Autolock lock(mSoundLock); 263 LOG1("CameraService::releaseSound ref=%d", mSoundRef); 264 if (--mSoundRef) return; 265 266 for (int i = 0; i < NUM_SOUNDS; i++) { 267 if (mSoundPlayer[i] != 0) { 268 mSoundPlayer[i]->disconnect(); 269 mSoundPlayer[i].clear(); 270 } 271 } 272} 273 274void CameraService::playSound(sound_kind kind) { 275 LOG1("playSound(%d)", kind); 276 Mutex::Autolock lock(mSoundLock); 277 sp<MediaPlayer> player = mSoundPlayer[kind]; 278 if (player != 0) { 279 // do not play the sound if stream volume is 0 280 // (typically because ringer mode is silent). 281 int index; 282 AudioSystem::getStreamVolumeIndex(AudioSystem::ENFORCED_AUDIBLE, &index); 283 if (index != 0) { 284 player->seekTo(0); 285 player->start(); 286 } 287 } 288} 289 290// ---------------------------------------------------------------------------- 291 292CameraService::Client::Client(const sp<CameraService>& cameraService, 293 const sp<ICameraClient>& cameraClient, 294 const sp<CameraHardwareInterface>& hardware, 295 int cameraId, int clientPid) { 296 int callingPid = getCallingPid(); 297 LOG1("Client::Client E (pid %d)", callingPid); 298 299 mCameraService = cameraService; 300 mCameraClient = cameraClient; 301 mHardware = hardware; 302 mCameraId = cameraId; 303 mClientPid = clientPid; 304 mUseOverlay = mHardware->useOverlay(); 305 mMsgEnabled = 0; 306 307 mHardware->setCallbacks(notifyCallback, 308 dataCallback, 309 dataCallbackTimestamp, 310 (void *)cameraId); 311 312 // Enable zoom, error, and focus messages by default 313 enableMsgType(CAMERA_MSG_ERROR | 314 CAMERA_MSG_ZOOM | 315 CAMERA_MSG_FOCUS); 316 mOverlayW = 0; 317 mOverlayH = 0; 318 319 // Callback is disabled by default 320 mPreviewCallbackFlag = FRAME_CALLBACK_FLAG_NOOP; 321 mOrientation = 0; 322 cameraService->setCameraBusy(cameraId); 323 cameraService->loadSound(); 324 LOG1("Client::Client X (pid %d)", callingPid); 325} 326 327static void *unregister_surface(void *arg) { 328 ISurface *surface = (ISurface *)arg; 329 surface->unregisterBuffers(); 330 IPCThreadState::self()->flushCommands(); 331 return NULL; 332} 333 334// tear down the client 335CameraService::Client::~Client() { 336 int callingPid = getCallingPid(); 337 LOG1("Client::~Client E (pid %d, this %p)", callingPid, this); 338 339 // set mClientPid to let disconnet() tear down the hardware 340 mClientPid = callingPid; 341 disconnect(); 342 mCameraService->releaseSound(); 343 LOG1("Client::~Client X (pid %d, this %p)", callingPid, this); 344} 345 346// ---------------------------------------------------------------------------- 347 348status_t CameraService::Client::checkPid() const { 349 int callingPid = getCallingPid(); 350 if (callingPid == mClientPid) return NO_ERROR; 351 352 LOGW("attempt to use a locked camera from a different process" 353 " (old pid %d, new pid %d)", mClientPid, callingPid); 354 return EBUSY; 355} 356 357status_t CameraService::Client::checkPidAndHardware() const { 358 status_t result = checkPid(); 359 if (result != NO_ERROR) return result; 360 if (mHardware == 0) { 361 LOGE("attempt to use a camera after disconnect() (pid %d)", getCallingPid()); 362 return INVALID_OPERATION; 363 } 364 return NO_ERROR; 365} 366 367status_t CameraService::Client::lock() { 368 int callingPid = getCallingPid(); 369 LOG1("lock (pid %d)", callingPid); 370 Mutex::Autolock lock(mLock); 371 372 // lock camera to this client if the the camera is unlocked 373 if (mClientPid == 0) { 374 mClientPid = callingPid; 375 return NO_ERROR; 376 } 377 378 // returns NO_ERROR if the client already owns the camera, EBUSY otherwise 379 return checkPid(); 380} 381 382status_t CameraService::Client::unlock() { 383 int callingPid = getCallingPid(); 384 LOG1("unlock (pid %d)", callingPid); 385 Mutex::Autolock lock(mLock); 386 387 // allow anyone to use camera (after they lock the camera) 388 status_t result = checkPid(); 389 if (result == NO_ERROR) { 390 mClientPid = 0; 391 LOG1("clear mCameraClient (pid %d)", callingPid); 392 // we need to remove the reference to ICameraClient so that when the app 393 // goes away, the reference count goes to 0. 394 mCameraClient.clear(); 395 } 396 return result; 397} 398 399// connect a new client to the camera 400status_t CameraService::Client::connect(const sp<ICameraClient>& client) { 401 int callingPid = getCallingPid(); 402 LOG1("connect E (pid %d)", callingPid); 403 Mutex::Autolock lock(mLock); 404 405 if (mClientPid != 0 && checkPid() != NO_ERROR) { 406 LOGW("Tried to connect to a locked camera (old pid %d, new pid %d)", 407 mClientPid, callingPid); 408 return EBUSY; 409 } 410 411 if (mCameraClient != 0 && (client->asBinder() == mCameraClient->asBinder())) { 412 LOG1("Connect to the same client"); 413 return NO_ERROR; 414 } 415 416 mPreviewCallbackFlag = FRAME_CALLBACK_FLAG_NOOP; 417 mClientPid = callingPid; 418 mCameraClient = client; 419 420 LOG1("connect X (pid %d)", callingPid); 421 return NO_ERROR; 422} 423 424void CameraService::Client::disconnect() { 425 int callingPid = getCallingPid(); 426 LOG1("disconnect E (pid %d)", callingPid); 427 Mutex::Autolock lock(mLock); 428 429 if (checkPid() != NO_ERROR) { 430 LOGW("different client - don't disconnect"); 431 return; 432 } 433 434 if (mClientPid <= 0) { 435 LOG1("camera is unlocked (mClientPid = %d), don't tear down hardware", mClientPid); 436 return; 437 } 438 439 // Make sure disconnect() is done once and once only, whether it is called 440 // from the user directly, or called by the destructor. 441 if (mHardware == 0) return; 442 443 LOG1("hardware teardown"); 444 // Before destroying mHardware, we must make sure it's in the 445 // idle state. 446 // Turn off all messages. 447 disableMsgType(CAMERA_MSG_ALL_MSGS); 448 mHardware->stopPreview(); 449 mHardware->cancelPicture(); 450 // Release the hardware resources. 451 mHardware->release(); 452 // Release the held overlay resources. 453 if (mUseOverlay) { 454 mOverlayRef = 0; 455 } 456 // Release the held ANativeWindow resources. 457 if (mPreviewWindow != 0) { 458 mPreviewWindow = 0; 459 mHardware->setPreviewWindow(mPreviewWindow); 460 } 461 mHardware.clear(); 462 463 mCameraService->removeClient(mCameraClient); 464 mCameraService->setCameraFree(mCameraId); 465 466 LOG1("disconnect X (pid %d)", callingPid); 467} 468 469// ---------------------------------------------------------------------------- 470 471// set the Surface that the preview will use 472status_t CameraService::Client::setPreviewDisplay(const sp<Surface>& surface) { 473 LOG1("setPreviewDisplay(%p) (pid %d)", surface.get(), getCallingPid()); 474 Mutex::Autolock lock(mLock); 475 status_t result = checkPidAndHardware(); 476 if (result != NO_ERROR) return result; 477 478 result = NO_ERROR; 479 480 // return if no change in surface. 481 // asBinder() is safe on NULL (returns NULL) 482 if (getISurface(surface)->asBinder() == mSurface->asBinder()) { 483 return result; 484 } 485 486 if (mSurface != 0) { 487 LOG1("clearing old preview surface %p", mSurface.get()); 488 if (mUseOverlay) { 489 // Force the destruction of any previous overlay 490 sp<Overlay> dummy; 491 mHardware->setOverlay(dummy); 492 } 493 } 494 if (surface != 0) { 495 mSurface = getISurface(surface); 496 } else { 497 mSurface = 0; 498 } 499 mPreviewWindow = surface; 500 mOverlayRef = 0; 501 // If preview has been already started, set overlay or register preview 502 // buffers now. 503 if (mHardware->previewEnabled()) { 504 if (mUseOverlay) { 505 result = setOverlay(); 506 } else if (mPreviewWindow != 0) { 507 result = mHardware->setPreviewWindow(mPreviewWindow); 508 } 509 } 510 511 return result; 512} 513 514status_t CameraService::Client::setOverlay() { 515 int w, h; 516 CameraParameters params(mHardware->getParameters()); 517 params.getPreviewSize(&w, &h); 518 519 if (w != mOverlayW || h != mOverlayH) { 520 // Force the destruction of any previous overlay 521 sp<Overlay> dummy; 522 mHardware->setOverlay(dummy); 523 mOverlayRef = 0; 524 } 525 526 status_t result = NO_ERROR; 527 if (mSurface == 0) { 528 result = mHardware->setOverlay(NULL); 529 } else { 530 if (mOverlayRef == 0) { 531 // FIXME: 532 // Surfaceflinger may hold onto the previous overlay reference for some 533 // time after we try to destroy it. retry a few times. In the future, we 534 // should make the destroy call block, or possibly specify that we can 535 // wait in the createOverlay call if the previous overlay is in the 536 // process of being destroyed. 537 for (int retry = 0; retry < 50; ++retry) { 538 mOverlayRef = mSurface->createOverlay(w, h, OVERLAY_FORMAT_DEFAULT, 539 mOrientation); 540 if (mOverlayRef != 0) break; 541 LOGW("Overlay create failed - retrying"); 542 usleep(20000); 543 } 544 if (mOverlayRef == 0) { 545 LOGE("Overlay Creation Failed!"); 546 return -EINVAL; 547 } 548 result = mHardware->setOverlay(new Overlay(mOverlayRef)); 549 } 550 } 551 if (result != NO_ERROR) { 552 LOGE("mHardware->setOverlay() failed with status %d\n", result); 553 return result; 554 } 555 556 mOverlayW = w; 557 mOverlayH = h; 558 559 return result; 560} 561 562// set the preview callback flag to affect how the received frames from 563// preview are handled. 564void CameraService::Client::setPreviewCallbackFlag(int callback_flag) { 565 LOG1("setPreviewCallbackFlag(%d) (pid %d)", callback_flag, getCallingPid()); 566 Mutex::Autolock lock(mLock); 567 if (checkPidAndHardware() != NO_ERROR) return; 568 569 mPreviewCallbackFlag = callback_flag; 570 if (mPreviewCallbackFlag & FRAME_CALLBACK_FLAG_ENABLE_MASK) { 571 enableMsgType(CAMERA_MSG_PREVIEW_FRAME); 572 } else { 573 disableMsgType(CAMERA_MSG_PREVIEW_FRAME); 574 } 575} 576 577// start preview mode 578status_t CameraService::Client::startPreview() { 579 LOG1("startPreview (pid %d)", getCallingPid()); 580 return startCameraMode(CAMERA_PREVIEW_MODE); 581} 582 583// start recording mode 584status_t CameraService::Client::startRecording() { 585 LOG1("startRecording (pid %d)", getCallingPid()); 586 return startCameraMode(CAMERA_RECORDING_MODE); 587} 588 589// start preview or recording 590status_t CameraService::Client::startCameraMode(camera_mode mode) { 591 LOG1("startCameraMode(%d)", mode); 592 Mutex::Autolock lock(mLock); 593 status_t result = checkPidAndHardware(); 594 if (result != NO_ERROR) return result; 595 596 switch(mode) { 597 case CAMERA_PREVIEW_MODE: 598 if (mSurface == 0 && mPreviewWindow == 0) { 599 LOG1("mSurface is not set yet."); 600 // still able to start preview in this case. 601 } 602 return startPreviewMode(); 603 case CAMERA_RECORDING_MODE: 604 if (mSurface == 0 && mPreviewWindow == 0) { 605 LOGE("mSurface or mPreviewWindow must be set before startRecordingMode."); 606 return INVALID_OPERATION; 607 } 608 return startRecordingMode(); 609 default: 610 return UNKNOWN_ERROR; 611 } 612} 613 614status_t CameraService::Client::startPreviewMode() { 615 LOG1("startPreviewMode"); 616 status_t result = NO_ERROR; 617 618 // if preview has been enabled, nothing needs to be done 619 if (mHardware->previewEnabled()) { 620 return NO_ERROR; 621 } 622 623 if (mUseOverlay) { 624 // If preview display has been set, set overlay now. 625 if (mSurface != 0) { 626 result = setOverlay(); 627 } 628 if (result != NO_ERROR) return result; 629 result = mHardware->startPreview(); 630 } else { 631 // XXX: Set the orientation of the ANativeWindow. 632 mHardware->setPreviewWindow(mPreviewWindow); 633 result = mHardware->startPreview(); 634 } 635 return result; 636} 637 638status_t CameraService::Client::startRecordingMode() { 639 LOG1("startRecordingMode"); 640 status_t result = NO_ERROR; 641 642 // if recording has been enabled, nothing needs to be done 643 if (mHardware->recordingEnabled()) { 644 return NO_ERROR; 645 } 646 647 // if preview has not been started, start preview first 648 if (!mHardware->previewEnabled()) { 649 result = startPreviewMode(); 650 if (result != NO_ERROR) { 651 return result; 652 } 653 } 654 655 // start recording mode 656 enableMsgType(CAMERA_MSG_VIDEO_FRAME); 657 mCameraService->playSound(SOUND_RECORDING); 658 result = mHardware->startRecording(); 659 if (result != NO_ERROR) { 660 LOGE("mHardware->startRecording() failed with status %d", result); 661 } 662 return result; 663} 664 665// stop preview mode 666void CameraService::Client::stopPreview() { 667 LOG1("stopPreview (pid %d)", getCallingPid()); 668 Mutex::Autolock lock(mLock); 669 if (checkPidAndHardware() != NO_ERROR) return; 670 671 672 disableMsgType(CAMERA_MSG_PREVIEW_FRAME); 673 mHardware->stopPreview(); 674 675 mPreviewBuffer.clear(); 676} 677 678// stop recording mode 679void CameraService::Client::stopRecording() { 680 LOG1("stopRecording (pid %d)", getCallingPid()); 681 Mutex::Autolock lock(mLock); 682 if (checkPidAndHardware() != NO_ERROR) return; 683 684 mCameraService->playSound(SOUND_RECORDING); 685 disableMsgType(CAMERA_MSG_VIDEO_FRAME); 686 mHardware->stopRecording(); 687 688 mPreviewBuffer.clear(); 689} 690 691// release a recording frame 692void CameraService::Client::releaseRecordingFrame(const sp<IMemory>& mem) { 693 Mutex::Autolock lock(mLock); 694 if (checkPidAndHardware() != NO_ERROR) return; 695 mHardware->releaseRecordingFrame(mem); 696} 697 698bool CameraService::Client::previewEnabled() { 699 LOG1("previewEnabled (pid %d)", getCallingPid()); 700 701 Mutex::Autolock lock(mLock); 702 if (checkPidAndHardware() != NO_ERROR) return false; 703 return mHardware->previewEnabled(); 704} 705 706bool CameraService::Client::recordingEnabled() { 707 LOG1("recordingEnabled (pid %d)", getCallingPid()); 708 709 Mutex::Autolock lock(mLock); 710 if (checkPidAndHardware() != NO_ERROR) return false; 711 return mHardware->recordingEnabled(); 712} 713 714status_t CameraService::Client::autoFocus() { 715 LOG1("autoFocus (pid %d)", getCallingPid()); 716 717 Mutex::Autolock lock(mLock); 718 status_t result = checkPidAndHardware(); 719 if (result != NO_ERROR) return result; 720 721 return mHardware->autoFocus(); 722} 723 724status_t CameraService::Client::cancelAutoFocus() { 725 LOG1("cancelAutoFocus (pid %d)", getCallingPid()); 726 727 Mutex::Autolock lock(mLock); 728 status_t result = checkPidAndHardware(); 729 if (result != NO_ERROR) return result; 730 731 return mHardware->cancelAutoFocus(); 732} 733 734// take a picture - image is returned in callback 735status_t CameraService::Client::takePicture() { 736 LOG1("takePicture (pid %d)", getCallingPid()); 737 738 Mutex::Autolock lock(mLock); 739 status_t result = checkPidAndHardware(); 740 if (result != NO_ERROR) return result; 741 742 enableMsgType(CAMERA_MSG_SHUTTER | 743 CAMERA_MSG_POSTVIEW_FRAME | 744 CAMERA_MSG_RAW_IMAGE | 745 CAMERA_MSG_COMPRESSED_IMAGE); 746 747 return mHardware->takePicture(); 748} 749 750// set preview/capture parameters - key/value pairs 751status_t CameraService::Client::setParameters(const String8& params) { 752 LOG1("setParameters (pid %d) (%s)", getCallingPid(), params.string()); 753 754 Mutex::Autolock lock(mLock); 755 status_t result = checkPidAndHardware(); 756 if (result != NO_ERROR) return result; 757 758 CameraParameters p(params); 759 return mHardware->setParameters(p); 760} 761 762// get preview/capture parameters - key/value pairs 763String8 CameraService::Client::getParameters() const { 764 Mutex::Autolock lock(mLock); 765 if (checkPidAndHardware() != NO_ERROR) return String8(); 766 767 String8 params(mHardware->getParameters().flatten()); 768 LOG1("getParameters (pid %d) (%s)", getCallingPid(), params.string()); 769 return params; 770} 771 772status_t CameraService::Client::sendCommand(int32_t cmd, int32_t arg1, int32_t arg2) { 773 LOG1("sendCommand (pid %d)", getCallingPid()); 774 Mutex::Autolock lock(mLock); 775 status_t result = checkPidAndHardware(); 776 if (result != NO_ERROR) return result; 777 778 if (cmd == CAMERA_CMD_SET_DISPLAY_ORIENTATION) { 779 // The orientation cannot be set during preview. 780 if (mHardware->previewEnabled()) { 781 return INVALID_OPERATION; 782 } 783 switch (arg1) { 784 case 0: 785 mOrientation = ISurface::BufferHeap::ROT_0; 786 break; 787 case 90: 788 mOrientation = ISurface::BufferHeap::ROT_90; 789 break; 790 case 180: 791 mOrientation = ISurface::BufferHeap::ROT_180; 792 break; 793 case 270: 794 mOrientation = ISurface::BufferHeap::ROT_270; 795 break; 796 default: 797 return BAD_VALUE; 798 } 799 return OK; 800 } 801 802 return mHardware->sendCommand(cmd, arg1, arg2); 803} 804 805// ---------------------------------------------------------------------------- 806 807void CameraService::Client::enableMsgType(int32_t msgType) { 808 android_atomic_or(msgType, &mMsgEnabled); 809 mHardware->enableMsgType(msgType); 810} 811 812void CameraService::Client::disableMsgType(int32_t msgType) { 813 android_atomic_and(~msgType, &mMsgEnabled); 814 mHardware->disableMsgType(msgType); 815} 816 817#define CHECK_MESSAGE_INTERVAL 10 // 10ms 818bool CameraService::Client::lockIfMessageWanted(int32_t msgType) { 819 int sleepCount = 0; 820 while (mMsgEnabled & msgType) { 821 if (mLock.tryLock() == NO_ERROR) { 822 if (sleepCount > 0) { 823 LOG1("lockIfMessageWanted(%d): waited for %d ms", 824 msgType, sleepCount * CHECK_MESSAGE_INTERVAL); 825 } 826 return true; 827 } 828 if (sleepCount++ == 0) { 829 LOG1("lockIfMessageWanted(%d): enter sleep", msgType); 830 } 831 usleep(CHECK_MESSAGE_INTERVAL * 1000); 832 } 833 LOGW("lockIfMessageWanted(%d): dropped unwanted message", msgType); 834 return false; 835} 836 837// ---------------------------------------------------------------------------- 838 839// Converts from a raw pointer to the client to a strong pointer during a 840// hardware callback. This requires the callbacks only happen when the client 841// is still alive. 842sp<CameraService::Client> CameraService::Client::getClientFromCookie(void* user) { 843 sp<Client> client = gCameraService->getClientById((int) user); 844 845 // This could happen if the Client is in the process of shutting down (the 846 // last strong reference is gone, but the destructor hasn't finished 847 // stopping the hardware). 848 if (client == 0) return NULL; 849 850 // The checks below are not necessary and are for debugging only. 851 if (client->mCameraService.get() != gCameraService) { 852 LOGE("mismatch service!"); 853 return NULL; 854 } 855 856 if (client->mHardware == 0) { 857 LOGE("mHardware == 0: callback after disconnect()?"); 858 return NULL; 859 } 860 861 return client; 862} 863 864// Callback messages can be dispatched to internal handlers or pass to our 865// client's callback functions, depending on the message type. 866// 867// notifyCallback: 868// CAMERA_MSG_SHUTTER handleShutter 869// (others) c->notifyCallback 870// dataCallback: 871// CAMERA_MSG_PREVIEW_FRAME handlePreviewData 872// CAMERA_MSG_POSTVIEW_FRAME handlePostview 873// CAMERA_MSG_RAW_IMAGE handleRawPicture 874// CAMERA_MSG_COMPRESSED_IMAGE handleCompressedPicture 875// (others) c->dataCallback 876// dataCallbackTimestamp 877// (others) c->dataCallbackTimestamp 878// 879// NOTE: the *Callback functions grab mLock of the client before passing 880// control to handle* functions. So the handle* functions must release the 881// lock before calling the ICameraClient's callbacks, so those callbacks can 882// invoke methods in the Client class again (For example, the preview frame 883// callback may want to releaseRecordingFrame). The handle* functions must 884// release the lock after all accesses to member variables, so it must be 885// handled very carefully. 886 887void CameraService::Client::notifyCallback(int32_t msgType, int32_t ext1, 888 int32_t ext2, void* user) { 889 LOG2("notifyCallback(%d)", msgType); 890 891 sp<Client> client = getClientFromCookie(user); 892 if (client == 0) return; 893 if (!client->lockIfMessageWanted(msgType)) return; 894 895 switch (msgType) { 896 case CAMERA_MSG_SHUTTER: 897 // ext1 is the dimension of the yuv picture. 898 client->handleShutter((image_rect_type *)ext1); 899 break; 900 default: 901 client->handleGenericNotify(msgType, ext1, ext2); 902 break; 903 } 904} 905 906void CameraService::Client::dataCallback(int32_t msgType, 907 const sp<IMemory>& dataPtr, void* user) { 908 LOG2("dataCallback(%d)", msgType); 909 910 sp<Client> client = getClientFromCookie(user); 911 if (client == 0) return; 912 if (!client->lockIfMessageWanted(msgType)) return; 913 914 if (dataPtr == 0) { 915 LOGE("Null data returned in data callback"); 916 client->handleGenericNotify(CAMERA_MSG_ERROR, UNKNOWN_ERROR, 0); 917 return; 918 } 919 920 switch (msgType) { 921 case CAMERA_MSG_PREVIEW_FRAME: 922 client->handlePreviewData(dataPtr); 923 break; 924 case CAMERA_MSG_POSTVIEW_FRAME: 925 client->handlePostview(dataPtr); 926 break; 927 case CAMERA_MSG_RAW_IMAGE: 928 client->handleRawPicture(dataPtr); 929 break; 930 case CAMERA_MSG_COMPRESSED_IMAGE: 931 client->handleCompressedPicture(dataPtr); 932 break; 933 default: 934 client->handleGenericData(msgType, dataPtr); 935 break; 936 } 937} 938 939void CameraService::Client::dataCallbackTimestamp(nsecs_t timestamp, 940 int32_t msgType, const sp<IMemory>& dataPtr, void* user) { 941 LOG2("dataCallbackTimestamp(%d)", msgType); 942 943 sp<Client> client = getClientFromCookie(user); 944 if (client == 0) return; 945 if (!client->lockIfMessageWanted(msgType)) return; 946 947 if (dataPtr == 0) { 948 LOGE("Null data returned in data with timestamp callback"); 949 client->handleGenericNotify(CAMERA_MSG_ERROR, UNKNOWN_ERROR, 0); 950 return; 951 } 952 953 client->handleGenericDataTimestamp(timestamp, msgType, dataPtr); 954} 955 956// snapshot taken callback 957// "size" is the width and height of yuv picture for registerBuffer. 958// If it is NULL, use the picture size from parameters. 959void CameraService::Client::handleShutter(image_rect_type *size) { 960 mCameraService->playSound(SOUND_SHUTTER); 961 962 sp<ICameraClient> c = mCameraClient; 963 if (c != 0) { 964 mLock.unlock(); 965 c->notifyCallback(CAMERA_MSG_SHUTTER, 0, 0); 966 if (!lockIfMessageWanted(CAMERA_MSG_SHUTTER)) return; 967 } 968 disableMsgType(CAMERA_MSG_SHUTTER); 969 970 // It takes some time before yuvPicture callback to be called. 971 // Register the buffer for raw image here to reduce latency. 972 if (mSurface != 0 && !mUseOverlay) { 973 int w, h; 974 CameraParameters params(mHardware->getParameters()); 975 if (size == NULL) { 976 params.getPictureSize(&w, &h); 977 } else { 978 w = size->width; 979 h = size->height; 980 w &= ~1; 981 h &= ~1; 982 LOG1("Snapshot image width=%d, height=%d", w, h); 983 } 984 // FIXME: don't use hardcoded format constants here 985 ISurface::BufferHeap buffers(w, h, w, h, 986 HAL_PIXEL_FORMAT_YCrCb_420_SP, mOrientation, 0, 987 mHardware->getRawHeap()); 988 989 IPCThreadState::self()->flushCommands(); 990 } 991 992 mLock.unlock(); 993} 994 995// preview callback - frame buffer update 996void CameraService::Client::handlePreviewData(const sp<IMemory>& mem) { 997 ssize_t offset; 998 size_t size; 999 sp<IMemoryHeap> heap = mem->getMemory(&offset, &size); 1000 1001 // local copy of the callback flags 1002 int flags = mPreviewCallbackFlag; 1003 1004 // is callback enabled? 1005 if (!(flags & FRAME_CALLBACK_FLAG_ENABLE_MASK)) { 1006 // If the enable bit is off, the copy-out and one-shot bits are ignored 1007 LOG2("frame callback is disabled"); 1008 mLock.unlock(); 1009 return; 1010 } 1011 1012 // hold a strong pointer to the client 1013 sp<ICameraClient> c = mCameraClient; 1014 1015 // clear callback flags if no client or one-shot mode 1016 if (c == 0 || (mPreviewCallbackFlag & FRAME_CALLBACK_FLAG_ONE_SHOT_MASK)) { 1017 LOG2("Disable preview callback"); 1018 mPreviewCallbackFlag &= ~(FRAME_CALLBACK_FLAG_ONE_SHOT_MASK | 1019 FRAME_CALLBACK_FLAG_COPY_OUT_MASK | 1020 FRAME_CALLBACK_FLAG_ENABLE_MASK); 1021 disableMsgType(CAMERA_MSG_PREVIEW_FRAME); 1022 } 1023 1024 if (c != 0) { 1025 // Is the received frame copied out or not? 1026 if (flags & FRAME_CALLBACK_FLAG_COPY_OUT_MASK) { 1027 LOG2("frame is copied"); 1028 copyFrameAndPostCopiedFrame(c, heap, offset, size); 1029 } else { 1030 LOG2("frame is forwarded"); 1031 mLock.unlock(); 1032 c->dataCallback(CAMERA_MSG_PREVIEW_FRAME, mem); 1033 } 1034 } else { 1035 mLock.unlock(); 1036 } 1037} 1038 1039// picture callback - postview image ready 1040void CameraService::Client::handlePostview(const sp<IMemory>& mem) { 1041 disableMsgType(CAMERA_MSG_POSTVIEW_FRAME); 1042 1043 sp<ICameraClient> c = mCameraClient; 1044 mLock.unlock(); 1045 if (c != 0) { 1046 c->dataCallback(CAMERA_MSG_POSTVIEW_FRAME, mem); 1047 } 1048} 1049 1050// picture callback - raw image ready 1051void CameraService::Client::handleRawPicture(const sp<IMemory>& mem) { 1052 disableMsgType(CAMERA_MSG_RAW_IMAGE); 1053 1054 ssize_t offset; 1055 size_t size; 1056 sp<IMemoryHeap> heap = mem->getMemory(&offset, &size); 1057 1058 sp<ICameraClient> c = mCameraClient; 1059 mLock.unlock(); 1060 if (c != 0) { 1061 c->dataCallback(CAMERA_MSG_RAW_IMAGE, mem); 1062 } 1063} 1064 1065// picture callback - compressed picture ready 1066void CameraService::Client::handleCompressedPicture(const sp<IMemory>& mem) { 1067 disableMsgType(CAMERA_MSG_COMPRESSED_IMAGE); 1068 1069 sp<ICameraClient> c = mCameraClient; 1070 mLock.unlock(); 1071 if (c != 0) { 1072 c->dataCallback(CAMERA_MSG_COMPRESSED_IMAGE, mem); 1073 } 1074} 1075 1076 1077void CameraService::Client::handleGenericNotify(int32_t msgType, 1078 int32_t ext1, int32_t ext2) { 1079 sp<ICameraClient> c = mCameraClient; 1080 mLock.unlock(); 1081 if (c != 0) { 1082 c->notifyCallback(msgType, ext1, ext2); 1083 } 1084} 1085 1086void CameraService::Client::handleGenericData(int32_t msgType, 1087 const sp<IMemory>& dataPtr) { 1088 sp<ICameraClient> c = mCameraClient; 1089 mLock.unlock(); 1090 if (c != 0) { 1091 c->dataCallback(msgType, dataPtr); 1092 } 1093} 1094 1095void CameraService::Client::handleGenericDataTimestamp(nsecs_t timestamp, 1096 int32_t msgType, const sp<IMemory>& dataPtr) { 1097 sp<ICameraClient> c = mCameraClient; 1098 mLock.unlock(); 1099 if (c != 0) { 1100 c->dataCallbackTimestamp(timestamp, msgType, dataPtr); 1101 } 1102} 1103 1104void CameraService::Client::copyFrameAndPostCopiedFrame( 1105 const sp<ICameraClient>& client, const sp<IMemoryHeap>& heap, 1106 size_t offset, size_t size) { 1107 LOG2("copyFrameAndPostCopiedFrame"); 1108 // It is necessary to copy out of pmem before sending this to 1109 // the callback. For efficiency, reuse the same MemoryHeapBase 1110 // provided it's big enough. Don't allocate the memory or 1111 // perform the copy if there's no callback. 1112 // hold the preview lock while we grab a reference to the preview buffer 1113 sp<MemoryHeapBase> previewBuffer; 1114 1115 if (mPreviewBuffer == 0) { 1116 mPreviewBuffer = new MemoryHeapBase(size, 0, NULL); 1117 } else if (size > mPreviewBuffer->virtualSize()) { 1118 mPreviewBuffer.clear(); 1119 mPreviewBuffer = new MemoryHeapBase(size, 0, NULL); 1120 } 1121 if (mPreviewBuffer == 0) { 1122 LOGE("failed to allocate space for preview buffer"); 1123 mLock.unlock(); 1124 return; 1125 } 1126 previewBuffer = mPreviewBuffer; 1127 1128 memcpy(previewBuffer->base(), (uint8_t *)heap->base() + offset, size); 1129 1130 sp<MemoryBase> frame = new MemoryBase(previewBuffer, 0, size); 1131 if (frame == 0) { 1132 LOGE("failed to allocate space for frame callback"); 1133 mLock.unlock(); 1134 return; 1135 } 1136 1137 mLock.unlock(); 1138 client->dataCallback(CAMERA_MSG_PREVIEW_FRAME, frame); 1139} 1140 1141// ---------------------------------------------------------------------------- 1142 1143static const int kDumpLockRetries = 50; 1144static const int kDumpLockSleep = 60000; 1145 1146static bool tryLock(Mutex& mutex) 1147{ 1148 bool locked = false; 1149 for (int i = 0; i < kDumpLockRetries; ++i) { 1150 if (mutex.tryLock() == NO_ERROR) { 1151 locked = true; 1152 break; 1153 } 1154 usleep(kDumpLockSleep); 1155 } 1156 return locked; 1157} 1158 1159status_t CameraService::dump(int fd, const Vector<String16>& args) { 1160 static const char* kDeadlockedString = "CameraService may be deadlocked\n"; 1161 1162 const size_t SIZE = 256; 1163 char buffer[SIZE]; 1164 String8 result; 1165 if (checkCallingPermission(String16("android.permission.DUMP")) == false) { 1166 snprintf(buffer, SIZE, "Permission Denial: " 1167 "can't dump CameraService from pid=%d, uid=%d\n", 1168 getCallingPid(), 1169 getCallingUid()); 1170 result.append(buffer); 1171 write(fd, result.string(), result.size()); 1172 } else { 1173 bool locked = tryLock(mServiceLock); 1174 // failed to lock - CameraService is probably deadlocked 1175 if (!locked) { 1176 String8 result(kDeadlockedString); 1177 write(fd, result.string(), result.size()); 1178 } 1179 1180 bool hasClient = false; 1181 for (int i = 0; i < mNumberOfCameras; i++) { 1182 sp<Client> client = mClient[i].promote(); 1183 if (client == 0) continue; 1184 hasClient = true; 1185 sprintf(buffer, "Client[%d] (%p) PID: %d\n", 1186 i, 1187 client->getCameraClient()->asBinder().get(), 1188 client->mClientPid); 1189 result.append(buffer); 1190 write(fd, result.string(), result.size()); 1191 client->mHardware->dump(fd, args); 1192 } 1193 if (!hasClient) { 1194 result.append("No camera client yet.\n"); 1195 write(fd, result.string(), result.size()); 1196 } 1197 1198 if (locked) mServiceLock.unlock(); 1199 1200 // change logging level 1201 int n = args.size(); 1202 for (int i = 0; i + 1 < n; i++) { 1203 if (args[i] == String16("-v")) { 1204 String8 levelStr(args[i+1]); 1205 int level = atoi(levelStr.string()); 1206 sprintf(buffer, "Set Log Level to %d", level); 1207 result.append(buffer); 1208 setLogLevel(level); 1209 } 1210 } 1211 } 1212 return NO_ERROR; 1213} 1214 1215sp<ISurface> CameraService::getISurface(const sp<Surface>& surface) { 1216 if (surface != 0) { 1217 return surface->getISurface(); 1218 } else { 1219 return sp<ISurface>(0); 1220 } 1221} 1222 1223}; // namespace android 1224