CameraService.cpp revision 377b2ec9a2885f9b6405b07ba900a9e3f4349c38 
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//#define LOG_NDEBUG 0
20
21#include <stdio.h>
22#include <sys/types.h>
23#include <pthread.h>
24
25#include <binder/AppOpsManager.h>
26#include <binder/IPCThreadState.h>
27#include <binder/IServiceManager.h>
28#include <binder/MemoryBase.h>
29#include <binder/MemoryHeapBase.h>
30#include <cutils/atomic.h>
31#include <cutils/properties.h>
32#include <gui/Surface.h>
33#include <hardware/hardware.h>
34#include <media/AudioSystem.h>
35#include <media/mediaplayer.h>
36#include <utils/Errors.h>
37#include <utils/Log.h>
38#include <utils/String16.h>
39
40#include "CameraService.h"
41#include "api1/CameraClient.h"
42#include "api1/Camera2Client.h"
43#include "api_pro/ProCamera2Client.h"
44#include "api2/CameraDeviceClient.h"
45#include "utils/CameraTraces.h"
46#include "CameraDeviceFactory.h"
47
48namespace android {
49
50// ----------------------------------------------------------------------------
51// Logging support -- this is for debugging only
52// Use "adb shell dumpsys media.camera -v 1" to change it.
53volatile int32_t gLogLevel = 0;
54
55#define LOG1(...) ALOGD_IF(gLogLevel >= 1, __VA_ARGS__);
56#define LOG2(...) ALOGD_IF(gLogLevel >= 2, __VA_ARGS__);
57
58static void setLogLevel(int level) {
59    android_atomic_write(level, &gLogLevel);
60}
61
62// ----------------------------------------------------------------------------
63
64static int getCallingPid() {
65    return IPCThreadState::self()->getCallingPid();
66}
67
68static int getCallingUid() {
69    return IPCThreadState::self()->getCallingUid();
70}
71
72extern "C" {
73static void camera_device_status_change(
74        const struct camera_module_callbacks* callbacks,
75        int camera_id,
76        int new_status) {
77    sp<CameraService> cs = const_cast<CameraService*>(
78                                static_cast<const CameraService*>(callbacks));
79
80    cs->onDeviceStatusChanged(
81        camera_id,
82        new_status);
83}
84} // extern "C"
85
86// ----------------------------------------------------------------------------
87
88// This is ugly and only safe if we never re-create the CameraService, but
89// should be ok for now.
90static CameraService *gCameraService;
91
92CameraService::CameraService()
93    :mSoundRef(0), mModule(0)
94{
95    ALOGI("CameraService started (pid=%d)", getpid());
96    gCameraService = this;
97
98    for (size_t i = 0; i < MAX_CAMERAS; ++i) {
99        mStatusList[i] = ICameraServiceListener::STATUS_PRESENT;
100    }
101
102    this->camera_device_status_change = android::camera_device_status_change;
103}
104
105void CameraService::onFirstRef()
106{
107    LOG1("CameraService::onFirstRef");
108
109    BnCameraService::onFirstRef();
110
111    if (hw_get_module(CAMERA_HARDWARE_MODULE_ID,
112                (const hw_module_t **)&mModule) < 0) {
113        ALOGE("Could not load camera HAL module");
114        mNumberOfCameras = 0;
115    }
116    else {
117        ALOGI("Loaded \"%s\" camera module", mModule->common.name);
118        mNumberOfCameras = mModule->get_number_of_cameras();
119        if (mNumberOfCameras > MAX_CAMERAS) {
120            ALOGE("Number of cameras(%d) > MAX_CAMERAS(%d).",
121                    mNumberOfCameras, MAX_CAMERAS);
122            mNumberOfCameras = MAX_CAMERAS;
123        }
124        for (int i = 0; i < mNumberOfCameras; i++) {
125            setCameraFree(i);
126        }
127
128        if (mModule->common.module_api_version >=
129                CAMERA_MODULE_API_VERSION_2_1) {
130            mModule->set_callbacks(this);
131        }
132
133        CameraDeviceFactory::registerService(this);
134    }
135}
136
137CameraService::~CameraService() {
138    for (int i = 0; i < mNumberOfCameras; i++) {
139        if (mBusy[i]) {
140            ALOGE("camera %d is still in use in destructor!", i);
141        }
142    }
143
144    gCameraService = NULL;
145}
146
147void CameraService::onDeviceStatusChanged(int cameraId,
148                                          int newStatus)
149{
150    ALOGI("%s: Status changed for cameraId=%d, newStatus=%d", __FUNCTION__,
151          cameraId, newStatus);
152
153    if (cameraId < 0 || cameraId >= MAX_CAMERAS) {
154        ALOGE("%s: Bad camera ID %d", __FUNCTION__, cameraId);
155        return;
156    }
157
158    if ((int)getStatus(cameraId) == newStatus) {
159        ALOGE("%s: State transition to the same status 0x%x not allowed",
160              __FUNCTION__, (uint32_t)newStatus);
161        return;
162    }
163
164    /* don't do this in updateStatus
165       since it is also called from connect and we could get into a deadlock */
166    if (newStatus == CAMERA_DEVICE_STATUS_NOT_PRESENT) {
167        Vector<sp<BasicClient> > clientsToDisconnect;
168        {
169           Mutex::Autolock al(mServiceLock);
170
171           /* Find all clients that we need to disconnect */
172           sp<BasicClient> client = mClient[cameraId].promote();
173           if (client.get() != NULL) {
174               clientsToDisconnect.push_back(client);
175           }
176
177           int i = cameraId;
178           for (size_t j = 0; j < mProClientList[i].size(); ++j) {
179               sp<ProClient> cl = mProClientList[i][j].promote();
180               if (cl != NULL) {
181                   clientsToDisconnect.push_back(cl);
182               }
183           }
184        }
185
186        /* now disconnect them. don't hold the lock
187           or we can get into a deadlock */
188
189        for (size_t i = 0; i < clientsToDisconnect.size(); ++i) {
190            sp<BasicClient> client = clientsToDisconnect[i];
191
192            client->disconnect();
193            /**
194             * The remote app will no longer be able to call methods on the
195             * client since the client PID will be reset to 0
196             */
197        }
198
199        ALOGV("%s: After unplug, disconnected %d clients",
200              __FUNCTION__, clientsToDisconnect.size());
201    }
202
203    updateStatus(
204            static_cast<ICameraServiceListener::Status>(newStatus), cameraId);
205
206}
207
208int32_t CameraService::getNumberOfCameras() {
209    return mNumberOfCameras;
210}
211
212status_t CameraService::getCameraInfo(int cameraId,
213                                      struct CameraInfo* cameraInfo) {
214    if (!mModule) {
215        return -ENODEV;
216    }
217
218    if (cameraId < 0 || cameraId >= mNumberOfCameras) {
219        return BAD_VALUE;
220    }
221
222    struct camera_info info;
223    status_t rc = mModule->get_camera_info(cameraId, &info);
224    cameraInfo->facing = info.facing;
225    cameraInfo->orientation = info.orientation;
226    return rc;
227}
228
229status_t CameraService::getCameraCharacteristics(int cameraId,
230                                                CameraMetadata* cameraInfo) {
231    if (!cameraInfo) {
232        ALOGE("%s: cameraInfo is NULL", __FUNCTION__);
233        return BAD_VALUE;
234    }
235
236    if (!mModule) {
237        ALOGE("%s: camera hardware module doesn't exist", __FUNCTION__);
238        return -ENODEV;
239    }
240
241    if (mModule->common.module_api_version < CAMERA_MODULE_API_VERSION_2_0) {
242        // TODO: Remove this check once HAL1 shim is in place.
243        ALOGE("%s: Only HAL module version V2 or higher supports static metadata", __FUNCTION__);
244        return BAD_VALUE;
245    }
246
247    if (cameraId < 0 || cameraId >= mNumberOfCameras) {
248        ALOGE("%s: Invalid camera id: %d", __FUNCTION__, cameraId);
249        return BAD_VALUE;
250    }
251
252    int facing;
253    if (getDeviceVersion(cameraId, &facing) == CAMERA_DEVICE_API_VERSION_1_0) {
254        // TODO: Remove this check once HAL1 shim is in place.
255        ALOGE("%s: HAL1 doesn't support static metadata yet", __FUNCTION__);
256        return BAD_VALUE;
257    }
258
259    if (getDeviceVersion(cameraId, &facing) <= CAMERA_DEVICE_API_VERSION_2_1) {
260        // Disable HAL2.x support for camera2 API for now.
261        ALOGW("%s: HAL2.x doesn't support getCameraCharacteristics for now", __FUNCTION__);
262        return BAD_VALUE;
263    }
264
265    struct camera_info info;
266    status_t ret = mModule->get_camera_info(cameraId, &info);
267    *cameraInfo = info.static_camera_characteristics;
268
269    return ret;
270}
271
272int CameraService::getDeviceVersion(int cameraId, int* facing) {
273    struct camera_info info;
274    if (mModule->get_camera_info(cameraId, &info) != OK) {
275        return -1;
276    }
277
278    int deviceVersion;
279    if (mModule->common.module_api_version >= CAMERA_MODULE_API_VERSION_2_0) {
280        deviceVersion = info.device_version;
281    } else {
282        deviceVersion = CAMERA_DEVICE_API_VERSION_1_0;
283    }
284
285    if (facing) {
286        *facing = info.facing;
287    }
288
289    return deviceVersion;
290}
291
292bool CameraService::isValidCameraId(int cameraId) {
293    int facing;
294    int deviceVersion = getDeviceVersion(cameraId, &facing);
295
296    switch(deviceVersion) {
297      case CAMERA_DEVICE_API_VERSION_1_0:
298      case CAMERA_DEVICE_API_VERSION_2_0:
299      case CAMERA_DEVICE_API_VERSION_2_1:
300      case CAMERA_DEVICE_API_VERSION_3_0:
301        return true;
302      default:
303        return false;
304    }
305
306    return false;
307}
308
309status_t CameraService::validateConnect(int cameraId,
310                                    /*inout*/
311                                    int& clientUid) const {
312
313    int callingPid = getCallingPid();
314
315    if (clientUid == USE_CALLING_UID) {
316        clientUid = getCallingUid();
317    } else {
318        // We only trust our own process to forward client UIDs
319        if (callingPid != getpid()) {
320            ALOGE("CameraService::connect X (pid %d) rejected (don't trust clientUid)",
321                    callingPid);
322            return PERMISSION_DENIED;
323        }
324    }
325
326    if (!mModule) {
327        ALOGE("Camera HAL module not loaded");
328        return -ENODEV;
329    }
330
331    if (cameraId < 0 || cameraId >= mNumberOfCameras) {
332        ALOGE("CameraService::connect X (pid %d) rejected (invalid cameraId %d).",
333            callingPid, cameraId);
334        return -ENODEV;
335    }
336
337    char value[PROPERTY_VALUE_MAX];
338    property_get("sys.secpolicy.camera.disabled", value, "0");
339    if (strcmp(value, "1") == 0) {
340        // Camera is disabled by DevicePolicyManager.
341        ALOGI("Camera is disabled. connect X (pid %d) rejected", callingPid);
342        return -EACCES;
343    }
344
345    ICameraServiceListener::Status currentStatus = getStatus(cameraId);
346    if (currentStatus == ICameraServiceListener::STATUS_NOT_PRESENT) {
347        ALOGI("Camera is not plugged in,"
348               " connect X (pid %d) rejected", callingPid);
349        return -ENODEV;
350    } else if (currentStatus == ICameraServiceListener::STATUS_ENUMERATING) {
351        ALOGI("Camera is enumerating,"
352               " connect X (pid %d) rejected", callingPid);
353        return -EBUSY;
354    }
355    // Else don't check for STATUS_NOT_AVAILABLE.
356    //  -- It's done implicitly in canConnectUnsafe /w the mBusy array
357
358    return OK;
359}
360
361bool CameraService::canConnectUnsafe(int cameraId,
362                                     const String16& clientPackageName,
363                                     const sp<IBinder>& remoteCallback,
364                                     sp<BasicClient> &client) {
365    String8 clientName8(clientPackageName);
366    int callingPid = getCallingPid();
367
368    if (mClient[cameraId] != 0) {
369        client = mClient[cameraId].promote();
370        if (client != 0) {
371            if (remoteCallback == client->getRemote()) {
372                LOG1("CameraService::connect X (pid %d) (the same client)",
373                     callingPid);
374                return true;
375            } else {
376                // TODOSC: need to support 1 regular client,
377                // multiple shared clients here
378                ALOGW("CameraService::connect X (pid %d) rejected"
379                      " (existing client).", callingPid);
380                return false;
381            }
382        }
383        mClient[cameraId].clear();
384    }
385
386    /*
387    mBusy is set to false as the last step of the Client destructor,
388    after which it is guaranteed that the Client destructor has finished (
389    including any inherited destructors)
390
391    We only need this for a Client subclasses since we don't allow
392    multiple Clents to be opened concurrently, but multiple BasicClient
393    would be fine
394    */
395    if (mBusy[cameraId]) {
396        ALOGW("CameraService::connect X (pid %d, \"%s\") rejected"
397                " (camera %d is still busy).", callingPid,
398                clientName8.string(), cameraId);
399        return false;
400    }
401
402    return true;
403}
404
405status_t CameraService::connect(
406        const sp<ICameraClient>& cameraClient,
407        int cameraId,
408        const String16& clientPackageName,
409        int clientUid,
410        /*out*/
411        sp<ICamera>& device) {
412
413    String8 clientName8(clientPackageName);
414    int callingPid = getCallingPid();
415
416    LOG1("CameraService::connect E (pid %d \"%s\", id %d)", callingPid,
417            clientName8.string(), cameraId);
418
419    status_t status = validateConnect(cameraId, /*inout*/clientUid);
420    if (status != OK) {
421        return status;
422    }
423
424
425    sp<Client> client;
426    {
427        Mutex::Autolock lock(mServiceLock);
428        sp<BasicClient> clientTmp;
429        if (!canConnectUnsafe(cameraId, clientPackageName,
430                              cameraClient->asBinder(),
431                              /*out*/clientTmp)) {
432            return -EBUSY;
433        } else if (client.get() != NULL) {
434            device = static_cast<Client*>(clientTmp.get());
435            return OK;
436        }
437
438        int facing = -1;
439        int deviceVersion = getDeviceVersion(cameraId, &facing);
440
441        // If there are other non-exclusive users of the camera,
442        //  this will tear them down before we can reuse the camera
443        if (isValidCameraId(cameraId)) {
444            // transition from PRESENT -> NOT_AVAILABLE
445            updateStatus(ICameraServiceListener::STATUS_NOT_AVAILABLE,
446                         cameraId);
447        }
448
449        switch(deviceVersion) {
450          case CAMERA_DEVICE_API_VERSION_1_0:
451            client = new CameraClient(this, cameraClient,
452                    clientPackageName, cameraId,
453                    facing, callingPid, clientUid, getpid());
454            break;
455          case CAMERA_DEVICE_API_VERSION_2_0:
456          case CAMERA_DEVICE_API_VERSION_2_1:
457          case CAMERA_DEVICE_API_VERSION_3_0:
458            client = new Camera2Client(this, cameraClient,
459                    clientPackageName, cameraId,
460                    facing, callingPid, clientUid, getpid(),
461                    deviceVersion);
462            break;
463          case -1:
464            ALOGE("Invalid camera id %d", cameraId);
465            return BAD_VALUE;
466          default:
467            ALOGE("Unknown camera device HAL version: %d", deviceVersion);
468            return INVALID_OPERATION;
469        }
470
471        status_t status = connectFinishUnsafe(client, client->getRemote());
472        if (status != OK) {
473            // this is probably not recoverable.. maybe the client can try again
474            // OK: we can only get here if we were originally in PRESENT state
475            updateStatus(ICameraServiceListener::STATUS_PRESENT, cameraId);
476            return status;
477        }
478
479        mClient[cameraId] = client;
480        LOG1("CameraService::connect X (id %d, this pid is %d)", cameraId,
481             getpid());
482    }
483    // important: release the mutex here so the client can call back
484    //    into the service from its destructor (can be at the end of the call)
485
486    device = client;
487    return OK;
488}
489
490status_t CameraService::connectFinishUnsafe(const sp<BasicClient>& client,
491                                            const sp<IBinder>& remoteCallback) {
492    status_t status = client->initialize(mModule);
493    if (status != OK) {
494        return status;
495    }
496
497    remoteCallback->linkToDeath(this);
498
499    return OK;
500}
501
502status_t CameraService::connectPro(
503                                        const sp<IProCameraCallbacks>& cameraCb,
504                                        int cameraId,
505                                        const String16& clientPackageName,
506                                        int clientUid,
507                                        /*out*/
508                                        sp<IProCameraUser>& device)
509{
510    String8 clientName8(clientPackageName);
511    int callingPid = getCallingPid();
512
513    LOG1("CameraService::connectPro E (pid %d \"%s\", id %d)", callingPid,
514            clientName8.string(), cameraId);
515    status_t status = validateConnect(cameraId, /*inout*/clientUid);
516    if (status != OK) {
517        return status;
518    }
519
520    sp<ProClient> client;
521    {
522        Mutex::Autolock lock(mServiceLock);
523        {
524            sp<BasicClient> client;
525            if (!canConnectUnsafe(cameraId, clientPackageName,
526                                  cameraCb->asBinder(),
527                                  /*out*/client)) {
528                return -EBUSY;
529            }
530        }
531
532        int facing = -1;
533        int deviceVersion = getDeviceVersion(cameraId, &facing);
534
535        switch(deviceVersion) {
536          case CAMERA_DEVICE_API_VERSION_1_0:
537            ALOGE("Camera id %d uses HALv1, doesn't support ProCamera",
538                  cameraId);
539            return -EOPNOTSUPP;
540            break;
541          case CAMERA_DEVICE_API_VERSION_2_0:
542          case CAMERA_DEVICE_API_VERSION_2_1:
543          case CAMERA_DEVICE_API_VERSION_3_0:
544            client = new ProCamera2Client(this, cameraCb, String16(),
545                    cameraId, facing, callingPid, USE_CALLING_UID, getpid());
546            break;
547          case -1:
548            ALOGE("Invalid camera id %d", cameraId);
549            return BAD_VALUE;
550          default:
551            ALOGE("Unknown camera device HAL version: %d", deviceVersion);
552            return INVALID_OPERATION;
553        }
554
555        status_t status = connectFinishUnsafe(client, client->getRemote());
556        if (status != OK) {
557            return status;
558        }
559
560        mProClientList[cameraId].push(client);
561
562        LOG1("CameraService::connectPro X (id %d, this pid is %d)", cameraId,
563                getpid());
564    }
565    // important: release the mutex here so the client can call back
566    //    into the service from its destructor (can be at the end of the call)
567    device = client;
568    return OK;
569}
570
571status_t CameraService::connectDevice(
572        const sp<ICameraDeviceCallbacks>& cameraCb,
573        int cameraId,
574        const String16& clientPackageName,
575        int clientUid,
576        /*out*/
577        sp<ICameraDeviceUser>& device)
578{
579
580    String8 clientName8(clientPackageName);
581    int callingPid = getCallingPid();
582
583    LOG1("CameraService::connectDevice E (pid %d \"%s\", id %d)", callingPid,
584            clientName8.string(), cameraId);
585
586    status_t status = validateConnect(cameraId, /*inout*/clientUid);
587    if (status != OK) {
588        return status;
589    }
590
591    sp<CameraDeviceClient> client;
592    {
593        Mutex::Autolock lock(mServiceLock);
594        {
595            sp<BasicClient> client;
596            if (!canConnectUnsafe(cameraId, clientPackageName,
597                                  cameraCb->asBinder(),
598                                  /*out*/client)) {
599                return -EBUSY;
600            }
601        }
602
603        int facing = -1;
604        int deviceVersion = getDeviceVersion(cameraId, &facing);
605
606        // If there are other non-exclusive users of the camera,
607        //  this will tear them down before we can reuse the camera
608        if (isValidCameraId(cameraId)) {
609            // transition from PRESENT -> NOT_AVAILABLE
610            updateStatus(ICameraServiceListener::STATUS_NOT_AVAILABLE,
611                         cameraId);
612        }
613
614        switch(deviceVersion) {
615          case CAMERA_DEVICE_API_VERSION_1_0:
616            ALOGW("Camera using old HAL version: %d", deviceVersion);
617            return -EOPNOTSUPP;
618           // TODO: don't allow 2.0  Only allow 2.1 and higher
619          case CAMERA_DEVICE_API_VERSION_2_0:
620          case CAMERA_DEVICE_API_VERSION_2_1:
621          case CAMERA_DEVICE_API_VERSION_3_0:
622            client = new CameraDeviceClient(this, cameraCb, String16(),
623                    cameraId, facing, callingPid, USE_CALLING_UID, getpid());
624            break;
625          case -1:
626            ALOGE("Invalid camera id %d", cameraId);
627            return BAD_VALUE;
628          default:
629            ALOGE("Unknown camera device HAL version: %d", deviceVersion);
630            return INVALID_OPERATION;
631        }
632
633        status_t status = connectFinishUnsafe(client, client->getRemote());
634        if (status != OK) {
635            // this is probably not recoverable.. maybe the client can try again
636            // OK: we can only get here if we were originally in PRESENT state
637            updateStatus(ICameraServiceListener::STATUS_PRESENT, cameraId);
638            return status;
639        }
640
641        LOG1("CameraService::connectDevice X (id %d, this pid is %d)", cameraId,
642                getpid());
643
644        mClient[cameraId] = client;
645    }
646    // important: release the mutex here so the client can call back
647    //    into the service from its destructor (can be at the end of the call)
648
649    device = client;
650    return OK;
651}
652
653
654status_t CameraService::addListener(
655                                const sp<ICameraServiceListener>& listener) {
656    ALOGV("%s: Add listener %p", __FUNCTION__, listener.get());
657
658    Mutex::Autolock lock(mServiceLock);
659
660    Vector<sp<ICameraServiceListener> >::iterator it, end;
661    for (it = mListenerList.begin(); it != mListenerList.end(); ++it) {
662        if ((*it)->asBinder() == listener->asBinder()) {
663            ALOGW("%s: Tried to add listener %p which was already subscribed",
664                  __FUNCTION__, listener.get());
665            return ALREADY_EXISTS;
666        }
667    }
668
669    mListenerList.push_back(listener);
670
671    /* Immediately signal current status to this listener only */
672    {
673        Mutex::Autolock m(mStatusMutex) ;
674        int numCams = getNumberOfCameras();
675        for (int i = 0; i < numCams; ++i) {
676            listener->onStatusChanged(mStatusList[i], i);
677        }
678    }
679
680    return OK;
681}
682status_t CameraService::removeListener(
683                                const sp<ICameraServiceListener>& listener) {
684    ALOGV("%s: Remove listener %p", __FUNCTION__, listener.get());
685
686    Mutex::Autolock lock(mServiceLock);
687
688    Vector<sp<ICameraServiceListener> >::iterator it;
689    for (it = mListenerList.begin(); it != mListenerList.end(); ++it) {
690        if ((*it)->asBinder() == listener->asBinder()) {
691            mListenerList.erase(it);
692            return OK;
693        }
694    }
695
696    ALOGW("%s: Tried to remove a listener %p which was not subscribed",
697          __FUNCTION__, listener.get());
698
699    return BAD_VALUE;
700}
701
702void CameraService::removeClientByRemote(const wp<IBinder>& remoteBinder) {
703    int callingPid = getCallingPid();
704    LOG1("CameraService::removeClientByRemote E (pid %d)", callingPid);
705
706    // Declare this before the lock to make absolutely sure the
707    // destructor won't be called with the lock held.
708    Mutex::Autolock lock(mServiceLock);
709
710    int outIndex;
711    sp<BasicClient> client = findClientUnsafe(remoteBinder, outIndex);
712
713    if (client != 0) {
714        // Found our camera, clear and leave.
715        LOG1("removeClient: clear camera %d", outIndex);
716        mClient[outIndex].clear();
717
718        client->getRemote()->unlinkToDeath(this);
719    } else {
720
721        sp<ProClient> clientPro = findProClientUnsafe(remoteBinder);
722
723        if (clientPro != NULL) {
724            // Found our camera, clear and leave.
725            LOG1("removeClient: clear pro %p", clientPro.get());
726
727            clientPro->getRemoteCallback()->asBinder()->unlinkToDeath(this);
728        }
729    }
730
731    LOG1("CameraService::removeClientByRemote X (pid %d)", callingPid);
732}
733
734sp<CameraService::ProClient> CameraService::findProClientUnsafe(
735                        const wp<IBinder>& cameraCallbacksRemote)
736{
737    sp<ProClient> clientPro;
738
739    for (int i = 0; i < mNumberOfCameras; ++i) {
740        Vector<size_t> removeIdx;
741
742        for (size_t j = 0; j < mProClientList[i].size(); ++j) {
743            wp<ProClient> cl = mProClientList[i][j];
744
745            sp<ProClient> clStrong = cl.promote();
746            if (clStrong != NULL && clStrong->getRemote() == cameraCallbacksRemote) {
747                clientPro = clStrong;
748                break;
749            } else if (clStrong == NULL) {
750                // mark to clean up dead ptr
751                removeIdx.push(j);
752            }
753        }
754
755        // remove stale ptrs (in reverse so the indices dont change)
756        for (ssize_t j = (ssize_t)removeIdx.size() - 1; j >= 0; --j) {
757            mProClientList[i].removeAt(removeIdx[j]);
758        }
759
760    }
761
762    return clientPro;
763}
764
765sp<CameraService::BasicClient> CameraService::findClientUnsafe(
766                        const wp<IBinder>& cameraClient, int& outIndex) {
767    sp<BasicClient> client;
768
769    for (int i = 0; i < mNumberOfCameras; i++) {
770
771        // This happens when we have already disconnected (or this is
772        // just another unused camera).
773        if (mClient[i] == 0) continue;
774
775        // Promote mClient. It can fail if we are called from this path:
776        // Client::~Client() -> disconnect() -> removeClientByRemote().
777        client = mClient[i].promote();
778
779        // Clean up stale client entry
780        if (client == NULL) {
781            mClient[i].clear();
782            continue;
783        }
784
785        if (cameraClient == client->getRemote()) {
786            // Found our camera
787            outIndex = i;
788            return client;
789        }
790    }
791
792    outIndex = -1;
793    return NULL;
794}
795
796CameraService::BasicClient* CameraService::getClientByIdUnsafe(int cameraId) {
797    if (cameraId < 0 || cameraId >= mNumberOfCameras) return NULL;
798    return mClient[cameraId].unsafe_get();
799}
800
801Mutex* CameraService::getClientLockById(int cameraId) {
802    if (cameraId < 0 || cameraId >= mNumberOfCameras) return NULL;
803    return &mClientLock[cameraId];
804}
805
806sp<CameraService::BasicClient> CameraService::getClientByRemote(
807                                const wp<IBinder>& cameraClient) {
808
809    // Declare this before the lock to make absolutely sure the
810    // destructor won't be called with the lock held.
811    sp<BasicClient> client;
812
813    Mutex::Autolock lock(mServiceLock);
814
815    int outIndex;
816    client = findClientUnsafe(cameraClient, outIndex);
817
818    return client;
819}
820
821status_t CameraService::onTransact(
822    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) {
823    // Permission checks
824    switch (code) {
825        case BnCameraService::CONNECT:
826        case BnCameraService::CONNECT_PRO:
827            const int pid = getCallingPid();
828            const int self_pid = getpid();
829            if (pid != self_pid) {
830                // we're called from a different process, do the real check
831                if (!checkCallingPermission(
832                        String16("android.permission.CAMERA"))) {
833                    const int uid = getCallingUid();
834                    ALOGE("Permission Denial: "
835                         "can't use the camera pid=%d, uid=%d", pid, uid);
836                    return PERMISSION_DENIED;
837                }
838            }
839            break;
840    }
841
842    return BnCameraService::onTransact(code, data, reply, flags);
843}
844
845// The reason we need this busy bit is a new CameraService::connect() request
846// may come in while the previous Client's destructor has not been run or is
847// still running. If the last strong reference of the previous Client is gone
848// but the destructor has not been finished, we should not allow the new Client
849// to be created because we need to wait for the previous Client to tear down
850// the hardware first.
851void CameraService::setCameraBusy(int cameraId) {
852    android_atomic_write(1, &mBusy[cameraId]);
853
854    ALOGV("setCameraBusy cameraId=%d", cameraId);
855}
856
857void CameraService::setCameraFree(int cameraId) {
858    android_atomic_write(0, &mBusy[cameraId]);
859
860    ALOGV("setCameraFree cameraId=%d", cameraId);
861}
862
863// We share the media players for shutter and recording sound for all clients.
864// A reference count is kept to determine when we will actually release the
865// media players.
866
867MediaPlayer* CameraService::newMediaPlayer(const char *file) {
868    MediaPlayer* mp = new MediaPlayer();
869    if (mp->setDataSource(file, NULL) == NO_ERROR) {
870        mp->setAudioStreamType(AUDIO_STREAM_ENFORCED_AUDIBLE);
871        mp->prepare();
872    } else {
873        ALOGE("Failed to load CameraService sounds: %s", file);
874        return NULL;
875    }
876    return mp;
877}
878
879void CameraService::loadSound() {
880    Mutex::Autolock lock(mSoundLock);
881    LOG1("CameraService::loadSound ref=%d", mSoundRef);
882    if (mSoundRef++) return;
883
884    mSoundPlayer[SOUND_SHUTTER] = newMediaPlayer("/system/media/audio/ui/camera_click.ogg");
885    mSoundPlayer[SOUND_RECORDING] = newMediaPlayer("/system/media/audio/ui/VideoRecord.ogg");
886}
887
888void CameraService::releaseSound() {
889    Mutex::Autolock lock(mSoundLock);
890    LOG1("CameraService::releaseSound ref=%d", mSoundRef);
891    if (--mSoundRef) return;
892
893    for (int i = 0; i < NUM_SOUNDS; i++) {
894        if (mSoundPlayer[i] != 0) {
895            mSoundPlayer[i]->disconnect();
896            mSoundPlayer[i].clear();
897        }
898    }
899}
900
901void CameraService::playSound(sound_kind kind) {
902    LOG1("playSound(%d)", kind);
903    Mutex::Autolock lock(mSoundLock);
904    sp<MediaPlayer> player = mSoundPlayer[kind];
905    if (player != 0) {
906        player->seekTo(0);
907        player->start();
908    }
909}
910
911// ----------------------------------------------------------------------------
912
913CameraService::Client::Client(const sp<CameraService>& cameraService,
914        const sp<ICameraClient>& cameraClient,
915        const String16& clientPackageName,
916        int cameraId, int cameraFacing,
917        int clientPid, uid_t clientUid,
918        int servicePid) :
919        CameraService::BasicClient(cameraService, cameraClient->asBinder(),
920                clientPackageName,
921                cameraId, cameraFacing,
922                clientPid, clientUid,
923                servicePid)
924{
925    int callingPid = getCallingPid();
926    LOG1("Client::Client E (pid %d, id %d)", callingPid, cameraId);
927
928    mRemoteCallback = cameraClient;
929
930    cameraService->setCameraBusy(cameraId);
931    cameraService->loadSound();
932
933    LOG1("Client::Client X (pid %d, id %d)", callingPid, cameraId);
934}
935
936// tear down the client
937CameraService::Client::~Client() {
938    ALOGV("~Client");
939    mDestructionStarted = true;
940
941    mCameraService->releaseSound();
942    // unconditionally disconnect. function is idempotent
943    Client::disconnect();
944}
945
946CameraService::BasicClient::BasicClient(const sp<CameraService>& cameraService,
947        const sp<IBinder>& remoteCallback,
948        const String16& clientPackageName,
949        int cameraId, int cameraFacing,
950        int clientPid, uid_t clientUid,
951        int servicePid):
952        mClientPackageName(clientPackageName)
953{
954    mCameraService = cameraService;
955    mRemoteBinder = remoteCallback;
956    mCameraId = cameraId;
957    mCameraFacing = cameraFacing;
958    mClientPid = clientPid;
959    mClientUid = clientUid;
960    mServicePid = servicePid;
961    mOpsActive = false;
962    mDestructionStarted = false;
963}
964
965CameraService::BasicClient::~BasicClient() {
966    ALOGV("~BasicClient");
967    mDestructionStarted = true;
968}
969
970void CameraService::BasicClient::disconnect() {
971    ALOGV("BasicClient::disconnect");
972    mCameraService->removeClientByRemote(mRemoteBinder);
973    // client shouldn't be able to call into us anymore
974    mClientPid = 0;
975}
976
977status_t CameraService::BasicClient::startCameraOps() {
978    int32_t res;
979
980    mOpsCallback = new OpsCallback(this);
981
982    {
983        ALOGV("%s: Start camera ops, package name = %s, client UID = %d",
984              __FUNCTION__, String8(mClientPackageName).string(), mClientUid);
985    }
986
987    mAppOpsManager.startWatchingMode(AppOpsManager::OP_CAMERA,
988            mClientPackageName, mOpsCallback);
989    res = mAppOpsManager.startOp(AppOpsManager::OP_CAMERA,
990            mClientUid, mClientPackageName);
991
992    if (res != AppOpsManager::MODE_ALLOWED) {
993        ALOGI("Camera %d: Access for \"%s\" has been revoked",
994                mCameraId, String8(mClientPackageName).string());
995        return PERMISSION_DENIED;
996    }
997    mOpsActive = true;
998    return OK;
999}
1000
1001status_t CameraService::BasicClient::finishCameraOps() {
1002    if (mOpsActive) {
1003        mAppOpsManager.finishOp(AppOpsManager::OP_CAMERA, mClientUid,
1004                mClientPackageName);
1005        mOpsActive = false;
1006    }
1007    mAppOpsManager.stopWatchingMode(mOpsCallback);
1008    mOpsCallback.clear();
1009
1010    return OK;
1011}
1012
1013void CameraService::BasicClient::opChanged(int32_t op, const String16& packageName) {
1014    String8 name(packageName);
1015    String8 myName(mClientPackageName);
1016
1017    if (op != AppOpsManager::OP_CAMERA) {
1018        ALOGW("Unexpected app ops notification received: %d", op);
1019        return;
1020    }
1021
1022    int32_t res;
1023    res = mAppOpsManager.checkOp(AppOpsManager::OP_CAMERA,
1024            mClientUid, mClientPackageName);
1025    ALOGV("checkOp returns: %d, %s ", res,
1026            res == AppOpsManager::MODE_ALLOWED ? "ALLOWED" :
1027            res == AppOpsManager::MODE_IGNORED ? "IGNORED" :
1028            res == AppOpsManager::MODE_ERRORED ? "ERRORED" :
1029            "UNKNOWN");
1030
1031    if (res != AppOpsManager::MODE_ALLOWED) {
1032        ALOGI("Camera %d: Access for \"%s\" revoked", mCameraId,
1033                myName.string());
1034        // Reset the client PID to allow server-initiated disconnect,
1035        // and to prevent further calls by client.
1036        mClientPid = getCallingPid();
1037        notifyError();
1038        disconnect();
1039    }
1040}
1041
1042// ----------------------------------------------------------------------------
1043
1044Mutex* CameraService::Client::getClientLockFromCookie(void* user) {
1045    return gCameraService->getClientLockById((int)(intptr_t) user);
1046}
1047
1048// Provide client pointer for callbacks. Client lock returned from getClientLockFromCookie should
1049// be acquired for this to be safe
1050CameraService::Client* CameraService::Client::getClientFromCookie(void* user) {
1051    BasicClient *basicClient = gCameraService->getClientByIdUnsafe((int)(intptr_t) user);
1052    // OK: only CameraClient calls this, and they already cast anyway.
1053    Client* client = static_cast<Client*>(basicClient);
1054
1055    // This could happen if the Client is in the process of shutting down (the
1056    // last strong reference is gone, but the destructor hasn't finished
1057    // stopping the hardware).
1058    if (client == NULL) return NULL;
1059
1060    // destruction already started, so should not be accessed
1061    if (client->mDestructionStarted) return NULL;
1062
1063    return client;
1064}
1065
1066void CameraService::Client::notifyError() {
1067    mRemoteCallback->notifyCallback(CAMERA_MSG_ERROR, CAMERA_ERROR_RELEASED, 0);
1068}
1069
1070// NOTE: function is idempotent
1071void CameraService::Client::disconnect() {
1072    ALOGV("Client::disconnect");
1073    BasicClient::disconnect();
1074    mCameraService->setCameraFree(mCameraId);
1075
1076    StatusVector rejectSourceStates;
1077    rejectSourceStates.push_back(ICameraServiceListener::STATUS_NOT_PRESENT);
1078    rejectSourceStates.push_back(ICameraServiceListener::STATUS_ENUMERATING);
1079
1080    // Transition to PRESENT if the camera is not in either of above 2 states
1081    mCameraService->updateStatus(ICameraServiceListener::STATUS_PRESENT,
1082                                 mCameraId,
1083                                 &rejectSourceStates);
1084}
1085
1086CameraService::Client::OpsCallback::OpsCallback(wp<BasicClient> client):
1087        mClient(client) {
1088}
1089
1090void CameraService::Client::OpsCallback::opChanged(int32_t op,
1091        const String16& packageName) {
1092    sp<BasicClient> client = mClient.promote();
1093    if (client != NULL) {
1094        client->opChanged(op, packageName);
1095    }
1096}
1097
1098// ----------------------------------------------------------------------------
1099//                  IProCamera
1100// ----------------------------------------------------------------------------
1101
1102CameraService::ProClient::ProClient(const sp<CameraService>& cameraService,
1103        const sp<IProCameraCallbacks>& remoteCallback,
1104        const String16& clientPackageName,
1105        int cameraId,
1106        int cameraFacing,
1107        int clientPid,
1108        uid_t clientUid,
1109        int servicePid)
1110        : CameraService::BasicClient(cameraService, remoteCallback->asBinder(),
1111                clientPackageName, cameraId, cameraFacing,
1112                clientPid,  clientUid, servicePid)
1113{
1114    mRemoteCallback = remoteCallback;
1115}
1116
1117CameraService::ProClient::~ProClient() {
1118}
1119
1120void CameraService::ProClient::notifyError() {
1121    mRemoteCallback->notifyCallback(CAMERA_MSG_ERROR, CAMERA_ERROR_RELEASED, 0);
1122}
1123
1124// ----------------------------------------------------------------------------
1125
1126static const int kDumpLockRetries = 50;
1127static const int kDumpLockSleep = 60000;
1128
1129static bool tryLock(Mutex& mutex)
1130{
1131    bool locked = false;
1132    for (int i = 0; i < kDumpLockRetries; ++i) {
1133        if (mutex.tryLock() == NO_ERROR) {
1134            locked = true;
1135            break;
1136        }
1137        usleep(kDumpLockSleep);
1138    }
1139    return locked;
1140}
1141
1142status_t CameraService::dump(int fd, const Vector<String16>& args) {
1143    String8 result;
1144    if (checkCallingPermission(String16("android.permission.DUMP")) == false) {
1145        result.appendFormat("Permission Denial: "
1146                "can't dump CameraService from pid=%d, uid=%d\n",
1147                getCallingPid(),
1148                getCallingUid());
1149        write(fd, result.string(), result.size());
1150    } else {
1151        bool locked = tryLock(mServiceLock);
1152        // failed to lock - CameraService is probably deadlocked
1153        if (!locked) {
1154            result.append("CameraService may be deadlocked\n");
1155            write(fd, result.string(), result.size());
1156        }
1157
1158        bool hasClient = false;
1159        if (!mModule) {
1160            result = String8::format("No camera module available!\n");
1161            write(fd, result.string(), result.size());
1162            return NO_ERROR;
1163        }
1164
1165        result = String8::format("Camera module HAL API version: 0x%x\n",
1166                mModule->common.hal_api_version);
1167        result.appendFormat("Camera module API version: 0x%x\n",
1168                mModule->common.module_api_version);
1169        result.appendFormat("Camera module name: %s\n",
1170                mModule->common.name);
1171        result.appendFormat("Camera module author: %s\n",
1172                mModule->common.author);
1173        result.appendFormat("Number of camera devices: %d\n\n", mNumberOfCameras);
1174        write(fd, result.string(), result.size());
1175        for (int i = 0; i < mNumberOfCameras; i++) {
1176            result = String8::format("Camera %d static information:\n", i);
1177            camera_info info;
1178
1179            status_t rc = mModule->get_camera_info(i, &info);
1180            if (rc != OK) {
1181                result.appendFormat("  Error reading static information!\n");
1182                write(fd, result.string(), result.size());
1183            } else {
1184                result.appendFormat("  Facing: %s\n",
1185                        info.facing == CAMERA_FACING_BACK ? "BACK" : "FRONT");
1186                result.appendFormat("  Orientation: %d\n", info.orientation);
1187                int deviceVersion;
1188                if (mModule->common.module_api_version <
1189                        CAMERA_MODULE_API_VERSION_2_0) {
1190                    deviceVersion = CAMERA_DEVICE_API_VERSION_1_0;
1191                } else {
1192                    deviceVersion = info.device_version;
1193                }
1194                result.appendFormat("  Device version: 0x%x\n", deviceVersion);
1195                if (deviceVersion >= CAMERA_DEVICE_API_VERSION_2_0) {
1196                    result.appendFormat("  Device static metadata:\n");
1197                    write(fd, result.string(), result.size());
1198                    dump_indented_camera_metadata(info.static_camera_characteristics,
1199                            fd, 2, 4);
1200                } else {
1201                    write(fd, result.string(), result.size());
1202                }
1203            }
1204
1205            sp<BasicClient> client = mClient[i].promote();
1206            if (client == 0) {
1207                result = String8::format("  Device is closed, no client instance\n");
1208                write(fd, result.string(), result.size());
1209                continue;
1210            }
1211            hasClient = true;
1212            result = String8::format("  Device is open. Client instance dump:\n");
1213            write(fd, result.string(), result.size());
1214            client->dump(fd, args);
1215        }
1216        if (!hasClient) {
1217            result = String8::format("\nNo active camera clients yet.\n");
1218            write(fd, result.string(), result.size());
1219        }
1220
1221        if (locked) mServiceLock.unlock();
1222
1223        // Dump camera traces if there were any
1224        write(fd, "\n", 1);
1225        camera3::CameraTraces::dump(fd, args);
1226
1227        // change logging level
1228        int n = args.size();
1229        for (int i = 0; i + 1 < n; i++) {
1230            String16 verboseOption("-v");
1231            if (args[i] == verboseOption) {
1232                String8 levelStr(args[i+1]);
1233                int level = atoi(levelStr.string());
1234                result = String8::format("\nSetting log level to %d.\n", level);
1235                setLogLevel(level);
1236                write(fd, result.string(), result.size());
1237            }
1238        }
1239
1240    }
1241    return NO_ERROR;
1242}
1243
1244/*virtual*/void CameraService::binderDied(
1245    const wp<IBinder> &who) {
1246
1247    /**
1248      * While tempting to promote the wp<IBinder> into a sp,
1249      * it's actually not supported by the binder driver
1250      */
1251
1252    ALOGV("java clients' binder died");
1253
1254    sp<BasicClient> cameraClient = getClientByRemote(who);
1255
1256    if (cameraClient == 0) {
1257        ALOGV("java clients' binder death already cleaned up (normal case)");
1258        return;
1259    }
1260
1261    ALOGW("Disconnecting camera client %p since the binder for it "
1262          "died (this pid %d)", cameraClient.get(), getCallingPid());
1263
1264    cameraClient->disconnect();
1265
1266}
1267
1268void CameraService::updateStatus(ICameraServiceListener::Status status,
1269                                 int32_t cameraId,
1270                                 const StatusVector *rejectSourceStates) {
1271    // do not lock mServiceLock here or can get into a deadlock from
1272    //  connect() -> ProClient::disconnect -> updateStatus
1273    Mutex::Autolock lock(mStatusMutex);
1274
1275    ICameraServiceListener::Status oldStatus = mStatusList[cameraId];
1276
1277    mStatusList[cameraId] = status;
1278
1279    if (oldStatus != status) {
1280        ALOGV("%s: Status has changed for camera ID %d from 0x%x to 0x%x",
1281              __FUNCTION__, cameraId, (uint32_t)oldStatus, (uint32_t)status);
1282
1283        if (oldStatus == ICameraServiceListener::STATUS_NOT_PRESENT &&
1284            (status != ICameraServiceListener::STATUS_PRESENT &&
1285             status != ICameraServiceListener::STATUS_ENUMERATING)) {
1286
1287            ALOGW("%s: From NOT_PRESENT can only transition into PRESENT"
1288                  " or ENUMERATING", __FUNCTION__);
1289            mStatusList[cameraId] = oldStatus;
1290            return;
1291        }
1292
1293        if (rejectSourceStates != NULL) {
1294            const StatusVector &rejectList = *rejectSourceStates;
1295            StatusVector::const_iterator it = rejectList.begin();
1296
1297            /**
1298             * Sometimes we want to conditionally do a transition.
1299             * For example if a client disconnects, we want to go to PRESENT
1300             * only if we weren't already in NOT_PRESENT or ENUMERATING.
1301             */
1302            for (; it != rejectList.end(); ++it) {
1303                if (oldStatus == *it) {
1304                    ALOGV("%s: Rejecting status transition for Camera ID %d, "
1305                          " since the source state was was in one of the bad "
1306                          " states.", __FUNCTION__, cameraId);
1307                    mStatusList[cameraId] = oldStatus;
1308                    return;
1309                }
1310            }
1311        }
1312
1313        /**
1314          * ProClients lose their exclusive lock.
1315          * - Done before the CameraClient can initialize the HAL device,
1316          *   since we want to be able to close it before they get to initialize
1317          */
1318        if (status == ICameraServiceListener::STATUS_NOT_AVAILABLE) {
1319            Vector<wp<ProClient> > proClients(mProClientList[cameraId]);
1320            Vector<wp<ProClient> >::const_iterator it;
1321
1322            for (it = proClients.begin(); it != proClients.end(); ++it) {
1323                sp<ProClient> proCl = it->promote();
1324                if (proCl.get() != NULL) {
1325                    proCl->onExclusiveLockStolen();
1326                }
1327            }
1328        }
1329
1330        Vector<sp<ICameraServiceListener> >::const_iterator it;
1331        for (it = mListenerList.begin(); it != mListenerList.end(); ++it) {
1332            (*it)->onStatusChanged(status, cameraId);
1333        }
1334    }
1335}
1336
1337ICameraServiceListener::Status CameraService::getStatus(int cameraId) const {
1338    if (cameraId < 0 || cameraId >= MAX_CAMERAS) {
1339        ALOGE("%s: Invalid camera ID %d", __FUNCTION__, cameraId);
1340        return ICameraServiceListener::STATUS_UNKNOWN;
1341    }
1342
1343    Mutex::Autolock al(mStatusMutex);
1344    return mStatusList[cameraId];
1345}
1346
1347}; // namespace android
1348