CameraService.h revision b10cdadf0fb945e23ca77008d4af76584bd0e39a 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_SERVERS_CAMERA_CAMERASERVICE_H
18#define ANDROID_SERVERS_CAMERA_CAMERASERVICE_H
19
20#include <utils/Vector.h>
21#include <utils/KeyedVector.h>
22#include <binder/AppOpsManager.h>
23#include <binder/BinderService.h>
24#include <binder/IAppOpsCallback.h>
25#include <camera/ICameraService.h>
26#include <hardware/camera.h>
27
28#include <camera/ICamera.h>
29#include <camera/ICameraClient.h>
30#include <camera/IProCameraUser.h>
31#include <camera/IProCameraCallbacks.h>
32#include <camera/camera2/ICameraDeviceUser.h>
33#include <camera/camera2/ICameraDeviceCallbacks.h>
34#include <camera/VendorTagDescriptor.h>
35#include <camera/CaptureResult.h>
36#include <camera/CameraParameters.h>
37
38#include <camera/ICameraServiceListener.h>
39
40/* This needs to be increased if we can have more cameras */
41#define MAX_CAMERAS 2
42
43namespace android {
44
45extern volatile int32_t gLogLevel;
46
47class MemoryHeapBase;
48class MediaPlayer;
49
50class CameraService :
51    public BinderService<CameraService>,
52    public BnCameraService,
53    public IBinder::DeathRecipient,
54    public camera_module_callbacks_t
55{
56    friend class BinderService<CameraService>;
57public:
58    class Client;
59    class BasicClient;
60
61    // Implementation of BinderService<T>
62    static char const* getServiceName() { return "media.camera"; }
63
64                        CameraService();
65    virtual             ~CameraService();
66
67    /////////////////////////////////////////////////////////////////////
68    // HAL Callbacks
69    virtual void        onDeviceStatusChanged(int cameraId,
70                                              int newStatus);
71
72    /////////////////////////////////////////////////////////////////////
73    // ICameraService
74    virtual int32_t     getNumberOfCameras();
75    virtual status_t    getCameraInfo(int cameraId,
76                                      struct CameraInfo* cameraInfo);
77    virtual status_t    getCameraCharacteristics(int cameraId,
78                                                 CameraMetadata* cameraInfo);
79    virtual status_t    getCameraVendorTagDescriptor(/*out*/ sp<VendorTagDescriptor>& desc);
80
81    virtual status_t connect(const sp<ICameraClient>& cameraClient, int cameraId,
82            const String16& clientPackageName, int clientUid,
83            /*out*/
84            sp<ICamera>& device);
85
86    virtual status_t connectLegacy(const sp<ICameraClient>& cameraClient, int cameraId,
87            int halVersion, const String16& clientPackageName, int clientUid,
88            /*out*/
89            sp<ICamera>& device);
90
91    virtual status_t connectPro(const sp<IProCameraCallbacks>& cameraCb,
92            int cameraId, const String16& clientPackageName, int clientUid,
93            /*out*/
94            sp<IProCameraUser>& device);
95
96    virtual status_t connectDevice(
97            const sp<ICameraDeviceCallbacks>& cameraCb,
98            int cameraId,
99            const String16& clientPackageName,
100            int clientUid,
101            /*out*/
102            sp<ICameraDeviceUser>& device);
103
104    virtual status_t    addListener(const sp<ICameraServiceListener>& listener);
105    virtual status_t    removeListener(
106                                    const sp<ICameraServiceListener>& listener);
107
108    virtual status_t    getLegacyParameters(
109            int cameraId,
110            /*out*/
111            String16* parameters);
112
113    // OK = supports api of that version, -EOPNOTSUPP = does not support
114    virtual status_t    supportsCameraApi(
115            int cameraId, int apiVersion);
116
117    // Extra permissions checks
118    virtual status_t    onTransact(uint32_t code, const Parcel& data,
119                                   Parcel* reply, uint32_t flags);
120
121    virtual status_t    dump(int fd, const Vector<String16>& args);
122
123    /////////////////////////////////////////////////////////////////////
124    // Client functionality
125    virtual void        removeClientByRemote(const wp<IBinder>& remoteBinder);
126
127    enum sound_kind {
128        SOUND_SHUTTER = 0,
129        SOUND_RECORDING = 1,
130        NUM_SOUNDS
131    };
132
133    void                loadSound();
134    void                playSound(sound_kind kind);
135    void                releaseSound();
136
137    /////////////////////////////////////////////////////////////////////
138    // CameraDeviceFactory functionality
139    int                 getDeviceVersion(int cameraId, int* facing = NULL);
140
141
142    /////////////////////////////////////////////////////////////////////
143    // CameraClient functionality
144
145    // returns plain pointer of client. Note that mClientLock should be acquired to
146    // prevent the client from destruction. The result can be NULL.
147    virtual BasicClient* getClientByIdUnsafe(int cameraId);
148    virtual Mutex*      getClientLockById(int cameraId);
149
150    class BasicClient : public virtual RefBase {
151    public:
152        virtual status_t initialize(camera_module_t *module) = 0;
153
154        virtual void          disconnect() = 0;
155
156        // because we can't virtually inherit IInterface, which breaks
157        // virtual inheritance
158        virtual sp<IBinder> asBinderWrapper() = 0;
159
160        // Return the remote callback binder object (e.g. IProCameraCallbacks)
161        sp<IBinder>     getRemote() {
162            return mRemoteBinder;
163        }
164
165        virtual status_t      dump(int fd, const Vector<String16>& args) = 0;
166
167    protected:
168        BasicClient(const sp<CameraService>& cameraService,
169                const sp<IBinder>& remoteCallback,
170                const String16& clientPackageName,
171                int cameraId,
172                int cameraFacing,
173                int clientPid,
174                uid_t clientUid,
175                int servicePid);
176
177        virtual ~BasicClient();
178
179        // the instance is in the middle of destruction. When this is set,
180        // the instance should not be accessed from callback.
181        // CameraService's mClientLock should be acquired to access this.
182        // - subclasses should set this to true in their destructors.
183        bool                            mDestructionStarted;
184
185        // these are initialized in the constructor.
186        sp<CameraService>               mCameraService;  // immutable after constructor
187        int                             mCameraId;       // immutable after constructor
188        int                             mCameraFacing;   // immutable after constructor
189        const String16                  mClientPackageName;
190        pid_t                           mClientPid;
191        uid_t                           mClientUid;      // immutable after constructor
192        pid_t                           mServicePid;     // immutable after constructor
193
194        // - The app-side Binder interface to receive callbacks from us
195        sp<IBinder>                     mRemoteBinder;   // immutable after constructor
196
197        // permissions management
198        status_t                        startCameraOps();
199        status_t                        finishCameraOps();
200
201        // Notify client about a fatal error
202        virtual void                    notifyError(
203                ICameraDeviceCallbacks::CameraErrorCode errorCode,
204                const CaptureResultExtras& resultExtras) = 0;
205    private:
206        AppOpsManager                   mAppOpsManager;
207
208        class OpsCallback : public BnAppOpsCallback {
209        public:
210            OpsCallback(wp<BasicClient> client);
211            virtual void opChanged(int32_t op, const String16& packageName);
212
213        private:
214            wp<BasicClient> mClient;
215
216        }; // class OpsCallback
217
218        sp<OpsCallback> mOpsCallback;
219        // Track whether startCameraOps was called successfully, to avoid
220        // finishing what we didn't start.
221        bool            mOpsActive;
222
223        // IAppOpsCallback interface, indirected through opListener
224        virtual void opChanged(int32_t op, const String16& packageName);
225    }; // class BasicClient
226
227    class Client : public BnCamera, public BasicClient
228    {
229    public:
230        typedef ICameraClient TCamCallbacks;
231
232        // ICamera interface (see ICamera for details)
233        virtual void          disconnect();
234        virtual status_t      connect(const sp<ICameraClient>& client) = 0;
235        virtual status_t      lock() = 0;
236        virtual status_t      unlock() = 0;
237        virtual status_t      setPreviewTarget(const sp<IGraphicBufferProducer>& bufferProducer)=0;
238        virtual void          setPreviewCallbackFlag(int flag) = 0;
239        virtual status_t      setPreviewCallbackTarget(
240                const sp<IGraphicBufferProducer>& callbackProducer) = 0;
241        virtual status_t      startPreview() = 0;
242        virtual void          stopPreview() = 0;
243        virtual bool          previewEnabled() = 0;
244        virtual status_t      storeMetaDataInBuffers(bool enabled) = 0;
245        virtual status_t      startRecording() = 0;
246        virtual void          stopRecording() = 0;
247        virtual bool          recordingEnabled() = 0;
248        virtual void          releaseRecordingFrame(const sp<IMemory>& mem) = 0;
249        virtual status_t      autoFocus() = 0;
250        virtual status_t      cancelAutoFocus() = 0;
251        virtual status_t      takePicture(int msgType) = 0;
252        virtual status_t      setParameters(const String8& params) = 0;
253        virtual String8       getParameters() const = 0;
254        virtual status_t      sendCommand(int32_t cmd, int32_t arg1, int32_t arg2) = 0;
255
256        // Interface used by CameraService
257        Client(const sp<CameraService>& cameraService,
258                const sp<ICameraClient>& cameraClient,
259                const String16& clientPackageName,
260                int cameraId,
261                int cameraFacing,
262                int clientPid,
263                uid_t clientUid,
264                int servicePid);
265        ~Client();
266
267        // return our camera client
268        const sp<ICameraClient>&    getRemoteCallback() {
269            return mRemoteCallback;
270        }
271
272        virtual sp<IBinder> asBinderWrapper() {
273            return asBinder();
274        }
275
276    protected:
277        static Mutex*        getClientLockFromCookie(void* user);
278        // convert client from cookie. Client lock should be acquired before getting Client.
279        static Client*       getClientFromCookie(void* user);
280
281        virtual void         notifyError(ICameraDeviceCallbacks::CameraErrorCode errorCode,
282                                         const CaptureResultExtras& resultExtras);
283
284        // Initialized in constructor
285
286        // - The app-side Binder interface to receive callbacks from us
287        sp<ICameraClient>               mRemoteCallback;
288
289    }; // class Client
290
291    class ProClient : public BnProCameraUser, public BasicClient {
292    public:
293        typedef IProCameraCallbacks TCamCallbacks;
294
295        ProClient(const sp<CameraService>& cameraService,
296                const sp<IProCameraCallbacks>& remoteCallback,
297                const String16& clientPackageName,
298                int cameraId,
299                int cameraFacing,
300                int clientPid,
301                uid_t clientUid,
302                int servicePid);
303
304        virtual ~ProClient();
305
306        const sp<IProCameraCallbacks>& getRemoteCallback() {
307            return mRemoteCallback;
308        }
309
310        /***
311            IProCamera implementation
312         ***/
313        virtual status_t      connect(const sp<IProCameraCallbacks>& callbacks)
314                                                                            = 0;
315        virtual status_t      exclusiveTryLock() = 0;
316        virtual status_t      exclusiveLock() = 0;
317        virtual status_t      exclusiveUnlock() = 0;
318
319        virtual bool          hasExclusiveLock() = 0;
320
321        // Note that the callee gets a copy of the metadata.
322        virtual int           submitRequest(camera_metadata_t* metadata,
323                                            bool streaming = false) = 0;
324        virtual status_t      cancelRequest(int requestId) = 0;
325
326        // Callbacks from camera service
327        virtual void          onExclusiveLockStolen() = 0;
328
329    protected:
330        virtual void          notifyError(ICameraDeviceCallbacks::CameraErrorCode errorCode,
331                                          const CaptureResultExtras& resultExtras);
332
333        sp<IProCameraCallbacks> mRemoteCallback;
334    }; // class ProClient
335
336private:
337
338    // Delay-load the Camera HAL module
339    virtual void onFirstRef();
340
341    // Step 1. Check if we can connect, before we acquire the service lock.
342    status_t            validateConnect(int cameraId,
343                                        /*inout*/
344                                        int& clientUid) const;
345
346    // Step 2. Check if we can connect, after we acquire the service lock.
347    bool                canConnectUnsafe(int cameraId,
348                                         const String16& clientPackageName,
349                                         const sp<IBinder>& remoteCallback,
350                                         /*out*/
351                                         sp<BasicClient> &client);
352
353    // When connection is successful, initialize client and track its death
354    status_t            connectFinishUnsafe(const sp<BasicClient>& client,
355                                            const sp<IBinder>& remoteCallback);
356
357    virtual sp<BasicClient>  getClientByRemote(const wp<IBinder>& cameraClient);
358
359    Mutex               mServiceLock;
360    // either a Client or CameraDeviceClient
361    wp<BasicClient>     mClient[MAX_CAMERAS];  // protected by mServiceLock
362    Mutex               mClientLock[MAX_CAMERAS]; // prevent Client destruction inside callbacks
363    int                 mNumberOfCameras;
364
365    typedef wp<ProClient> weak_pro_client_ptr;
366    Vector<weak_pro_client_ptr> mProClientList[MAX_CAMERAS];
367
368    // needs to be called with mServiceLock held
369    sp<BasicClient>     findClientUnsafe(const wp<IBinder>& cameraClient, int& outIndex);
370    sp<ProClient>       findProClientUnsafe(
371                                     const wp<IBinder>& cameraCallbacksRemote);
372
373    // atomics to record whether the hardware is allocated to some client.
374    volatile int32_t    mBusy[MAX_CAMERAS];
375    void                setCameraBusy(int cameraId);
376    void                setCameraFree(int cameraId);
377
378    // sounds
379    MediaPlayer*        newMediaPlayer(const char *file);
380
381    Mutex               mSoundLock;
382    sp<MediaPlayer>     mSoundPlayer[NUM_SOUNDS];
383    int                 mSoundRef;  // reference count (release all MediaPlayer when 0)
384
385    camera_module_t *mModule;
386
387    Vector<sp<ICameraServiceListener> >
388                        mListenerList;
389
390    // guard only mStatusList and the broadcasting of ICameraServiceListener
391    mutable Mutex       mStatusMutex;
392    ICameraServiceListener::Status
393                        mStatusList[MAX_CAMERAS];
394
395    // Read the current status (locks mStatusMutex)
396    ICameraServiceListener::Status
397                        getStatus(int cameraId) const;
398
399    typedef Vector<ICameraServiceListener::Status> StatusVector;
400    // Broadcast the new status if it changed (locks the service mutex)
401    void                updateStatus(
402                            ICameraServiceListener::Status status,
403                            int32_t cameraId,
404                            const StatusVector *rejectSourceStates = NULL);
405
406    // IBinder::DeathRecipient implementation
407    virtual void        binderDied(const wp<IBinder> &who);
408
409    // Helpers
410
411    bool                isValidCameraId(int cameraId);
412
413    bool                setUpVendorTags();
414
415    /**
416     * A mapping of camera ids to CameraParameters returned by that camera device.
417     *
418     * This cache is used to generate CameraCharacteristic metadata when using
419     * the HAL1 shim.
420     */
421    KeyedVector<int, CameraParameters>    mShimParams;
422
423    /**
424     * Initialize and cache the metadata used by the HAL1 shim for a given cameraId.
425     *
426     * Returns OK on success, or a negative error code.
427     */
428    status_t            initializeShimMetadata(int cameraId);
429
430    /**
431     * Get the cached CameraParameters for the camera. If they haven't been
432     * cached yet, then initialize them for the first time.
433     *
434     * Returns OK on success, or a negative error code.
435     */
436    status_t            getLegacyParametersLazy(int cameraId, /*out*/CameraParameters* parameters);
437
438    /**
439     * Generate the CameraCharacteristics metadata required by the Camera2 API
440     * from the available HAL1 CameraParameters and CameraInfo.
441     *
442     * Returns OK on success, or a negative error code.
443     */
444    status_t            generateShimMetadata(int cameraId, /*out*/CameraMetadata* cameraInfo);
445
446    /**
447     * Connect a new camera client.  This should only be used while holding the
448     * mutex for mServiceLock.
449     *
450     * Returns OK on success, or a negative error code.
451     */
452    status_t            connectHelperLocked(const sp<ICameraClient>& cameraClient,
453                                      int cameraId,
454                                      const String16& clientPackageName,
455                                      int clientUid,
456                                      int callingPid,
457                                      /*out*/
458                                      sp<Client>& client,
459                                      int halVersion = CAMERA_HAL_API_VERSION_UNSPECIFIED);
460};
461
462} // namespace android
463
464#endif
465