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      1 /*
      2  * Copyright (C) 2016 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_HARDWARE_AUTOMOTIVE_EVS_V1_0_EVSCAMERAENUMERATOR_H
     18 #define ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_0_EVSCAMERAENUMERATOR_H
     19 
     20 #include <android/hardware/automotive/evs/1.0/IEvsEnumerator.h>
     21 #include <android/hardware/automotive/evs/1.0/IEvsCamera.h>
     22 
     23 #include <list>
     24 
     25 
     26 namespace android {
     27 namespace hardware {
     28 namespace automotive {
     29 namespace evs {
     30 namespace V1_0 {
     31 namespace implementation {
     32 
     33 
     34 class EvsV4lCamera;    // from EvsCamera.h
     35 class EvsGlDisplay;    // from EvsGlDisplay.h
     36 
     37 
     38 class EvsEnumerator : public IEvsEnumerator {
     39 public:
     40     // Methods from ::android::hardware::automotive::evs::V1_0::IEvsEnumerator follow.
     41     Return<void> getCameraList(getCameraList_cb _hidl_cb)  override;
     42     Return<sp<IEvsCamera>> openCamera(const hidl_string& cameraId) override;
     43     Return<void> closeCamera(const ::android::sp<IEvsCamera>& carCamera)  override;
     44     Return<sp<IEvsDisplay>> openDisplay()  override;
     45     Return<void> closeDisplay(const ::android::sp<IEvsDisplay>& display)  override;
     46     Return<DisplayState> getDisplayState()  override;
     47 
     48     // Implementation details
     49     EvsEnumerator();
     50 
     51 private:
     52     struct CameraRecord {
     53         CameraDesc          desc;
     54         wp<EvsV4lCamera>    activeInstance;
     55 
     56         CameraRecord(const char *cameraId) : desc() { desc.cameraId = cameraId; }
     57     };
     58 
     59 
     60     static bool qualifyCaptureDevice(const char* deviceName);
     61     static CameraRecord* findCameraById(const std::string& cameraId);
     62 
     63 
     64     // NOTE:  All members values are static so that all clients operate on the same state
     65     //        That is to say, this is effectively a singleton despite the fact that HIDL
     66     //        constructs a new instance for each client.
     67     //        Because our server has a single thread in the thread pool, these values are
     68     //        never accessed concurrently despite potentially having multiple instance objects
     69     //        using them.
     70     static std::list<CameraRecord> sCameraList;
     71 
     72     static wp<EvsGlDisplay>          sActiveDisplay; // Weak pointer. Object destructs if client dies.
     73 };
     74 
     75 } // namespace implementation
     76 } // namespace V1_0
     77 } // namespace evs
     78 } // namespace automotive
     79 } // namespace hardware
     80 } // namespace android
     81 
     82 #endif  // ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_0_EVSCAMERAENUMERATOR_H
     83