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      1 /*
      2  * Copyright (C) 2011 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 HW_EMULATOR_CAMERA_EMULATED_CAMERA_FACTORY_H
     18 #define HW_EMULATOR_CAMERA_EMULATED_CAMERA_FACTORY_H
     19 
     20 #include "EmulatedCamera.h"
     21 #include "QemuClient.h"
     22 
     23 namespace android {
     24 
     25 /*
     26  * Contains declaration of a class EmulatedCameraFactory that manages cameras
     27  * available for the emulation. A global instance of this class is statically
     28  * instantiated and initialized when camera emulation HAL is loaded.
     29  */
     30 
     31 /* Class EmulatedCameraFactoryManages cameras available for the emulation.
     32  *
     33  * When the global static instance of this class is created on the module load,
     34  * it enumerates cameras available for the emulation by connecting to the
     35  * emulator's 'camera' service. For every camera found out there it creates an
     36  * instance of an appropriate class, and stores it an in array of emulated
     37  * cameras. In addition to the cameras reported by the emulator, a fake camera
     38  * emulator is always created, so there is always at least one camera that is
     39  * available.
     40  *
     41  * Instance of this class is also used as the entry point for the camera HAL API,
     42  * including:
     43  *  - hw_module_methods_t::open entry point
     44  *  - camera_module_t::get_number_of_cameras entry point
     45  *  - camera_module_t::get_camera_info entry point
     46  *
     47  */
     48 class EmulatedCameraFactory {
     49 public:
     50     /* Constructs EmulatedCameraFactory instance.
     51      * In this constructor the factory will create and initialize a list of
     52      * emulated cameras. All errors that occur on this constructor are reported
     53      * via mConstructedOK data member of this class.
     54      */
     55     EmulatedCameraFactory();
     56 
     57     /* Destructs EmulatedCameraFactory instance. */
     58     ~EmulatedCameraFactory();
     59 
     60     /****************************************************************************
     61      * Camera HAL API handlers.
     62      ***************************************************************************/
     63 
     64 public:
     65     /* Opens (connects to) a camera device.
     66      * This method is called in response to hw_module_methods_t::open callback.
     67      */
     68     int cameraDeviceOpen(int camera_id, hw_device_t** device);
     69 
     70     /* Gets emulated camera information.
     71      * This method is called in response to camera_module_t::get_camera_info callback.
     72      */
     73     int getCameraInfo(int camera_id, struct camera_info *info);
     74 
     75     /****************************************************************************
     76      * Camera HAL API callbacks.
     77      ***************************************************************************/
     78 
     79 public:
     80     /* camera_module_t::get_number_of_cameras callback entry point. */
     81     static int get_number_of_cameras(void);
     82 
     83     /* camera_module_t::get_camera_info callback entry point. */
     84     static int get_camera_info(int camera_id, struct camera_info *info);
     85 
     86 private:
     87     /* hw_module_methods_t::open callback entry point. */
     88     static int device_open(const hw_module_t* module,
     89                            const char* name,
     90                            hw_device_t** device);
     91 
     92     /****************************************************************************
     93      * Public API.
     94      ***************************************************************************/
     95 
     96 public:
     97 
     98     /* Gets fake camera orientation. */
     99     int getFakeCameraOrientation() {
    100         /* TODO: Have a boot property that controls that. */
    101         return 90;
    102     }
    103 
    104     /* Gets qemu camera orientation. */
    105     int getQemuCameraOrientation() {
    106         /* TODO: Have a boot property that controls that. */
    107         return 270;
    108     }
    109 
    110     /* Gets number of emulated cameras.
    111      */
    112     int getEmulatedCameraNum() const {
    113         return mEmulatedCameraNum;
    114     }
    115 
    116     /* Checks whether or not the constructor has succeeded.
    117      */
    118     bool isConstructedOK() const {
    119         return mConstructedOK;
    120     }
    121 
    122     /****************************************************************************
    123      * Private API
    124      ***************************************************************************/
    125 
    126 private:
    127     /* Populates emulated cameras array with cameras that are available via
    128      * 'camera' service in the emulator. For each such camera and instance of
    129      * the EmulatedCameraQemud will be created and added to the mEmulatedCameras
    130      * array.
    131      */
    132     void createQemuCameras();
    133 
    134     /* Checks if fake camera emulation is on. */
    135     bool isFakeCameraEmulationOn();
    136 
    137     /****************************************************************************
    138      * Data members.
    139      ***************************************************************************/
    140 
    141 private:
    142     /* Connection to the camera service in the emulator. */
    143     FactoryQemuClient   mQemuClient;
    144 
    145     /* Array of cameras available for the emulation. */
    146     EmulatedCamera**    mEmulatedCameras;
    147 
    148     /* Number of emulated cameras (including the fake one). */
    149     int                 mEmulatedCameraNum;
    150 
    151     /* Fake camera ID. */
    152     int                 mFakeCameraID;
    153 
    154     /* Flags whether or not constructor has succeeded. */
    155     bool                mConstructedOK;
    156 
    157 public:
    158     /* Contains device open entry point, as required by HAL API. */
    159     static struct hw_module_methods_t   mCameraModuleMethods;
    160 };
    161 
    162 }; /* namespace android */
    163 
    164 /* References the global EmulatedCameraFactory instance. */
    165 extern android::EmulatedCameraFactory   gEmulatedCameraFactory;
    166 
    167 #endif  /* HW_EMULATOR_CAMERA_EMULATED_CAMERA_FACTORY_H */
    168