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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_QEMU_CAMERA_DEVICE_H
     18 #define HW_EMULATOR_CAMERA_EMULATED_QEMU_CAMERA_DEVICE_H
     19 
     20 /*
     21  * Contains declaration of a class EmulatedQemuCameraDevice that encapsulates
     22  * an emulated camera device connected to the host.
     23  */
     24 
     25 #include "EmulatedCameraDevice.h"
     26 #include "QemuClient.h"
     27 
     28 namespace android {
     29 
     30 class EmulatedQemuCamera;
     31 
     32 /* Encapsulates an emulated camera device connected to the host.
     33  */
     34 class EmulatedQemuCameraDevice : public EmulatedCameraDevice {
     35 public:
     36     /* Constructs EmulatedQemuCameraDevice instance. */
     37     explicit EmulatedQemuCameraDevice(EmulatedQemuCamera* camera_hal);
     38 
     39     /* Destructs EmulatedQemuCameraDevice instance. */
     40     ~EmulatedQemuCameraDevice();
     41 
     42     /***************************************************************************
     43      * Public API
     44      **************************************************************************/
     45 
     46 public:
     47     /* Initializes EmulatedQemuCameraDevice instance.
     48      * Param:
     49      *  device_name - Name of the camera device connected to the host. The name
     50      *      that is used here must have been reported by the 'factory' camera
     51      *      service when it listed camera devices connected to the host.
     52      * Return:
     53      *  NO_ERROR on success, or an appropriate error status.
     54      */
     55     status_t Initialize(const char* device_name);
     56 
     57     /***************************************************************************
     58      * Emulated camera device abstract interface implementation.
     59      * See declarations of these methods in EmulatedCameraDevice class for
     60      * information on each of these methods.
     61      **************************************************************************/
     62 
     63 public:
     64     /* Connects to the camera device. */
     65     status_t connectDevice();
     66 
     67     /* Disconnects from the camera device. */
     68     status_t disconnectDevice();
     69 
     70     /* Starts capturing frames from the camera device. */
     71     status_t startDevice(int width, int height, uint32_t pix_fmt);
     72 
     73     /* Stops capturing frames from the camera device. */
     74     status_t stopDevice();
     75 
     76     /***************************************************************************
     77      * EmulatedCameraDevice virtual overrides
     78      * See declarations of these methods in EmulatedCameraDevice class for
     79      * information on each of these methods.
     80      **************************************************************************/
     81 
     82 public:
     83     /* Gets current preview fame into provided buffer.
     84      * We override this method in order to provide preview frames cached in this
     85      * object.
     86      */
     87     status_t getCurrentPreviewFrame(void* buffer);
     88 
     89     /***************************************************************************
     90      * Worker thread management overrides.
     91      * See declarations of these methods in EmulatedCameraDevice class for
     92      * information on each of these methods.
     93      **************************************************************************/
     94 
     95 protected:
     96     /* Implementation of the worker thread routine. */
     97     bool inWorkerThread();
     98 
     99     /***************************************************************************
    100      * Qemu camera device data members
    101      **************************************************************************/
    102 
    103 private:
    104     /* Qemu client that is used to communicate with the 'emulated camera'
    105      * service, created for this instance in the emulator. */
    106     CameraQemuClient    mQemuClient;
    107 
    108     /* Name of the camera device connected to the host. */
    109     String8             mDeviceName;
    110 
    111     /* Current preview framebuffer. */
    112     uint32_t*           mPreviewFrame;
    113 
    114     /* Emulated FPS (frames per second).
    115      * We will emulate 50 FPS. */
    116     static const int    mEmulatedFPS = 50;
    117 };
    118 
    119 }; /* namespace android */
    120 
    121 #endif  /* HW_EMULATOR_CAMERA_EMULATED_QEMU_CAMERA_DEVICE_H */
    122