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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_AUTOMOTIVE_EVS_V1_0_HALCAMERA_H
     18 #define ANDROID_AUTOMOTIVE_EVS_V1_0_HALCAMERA_H
     19 
     20 #include <android/hardware/automotive/evs/1.0/types.h>
     21 #include <android/hardware/automotive/evs/1.0/IEvsCamera.h>
     22 #include <ui/GraphicBuffer.h>
     23 
     24 #include <thread>
     25 #include <list>
     26 
     27 
     28 using namespace ::android::hardware::automotive::evs::V1_0;
     29 using ::android::hardware::Return;
     30 using ::android::hardware::hidl_handle;
     31 
     32 namespace android {
     33 namespace automotive {
     34 namespace evs {
     35 namespace V1_0 {
     36 namespace implementation {
     37 
     38 
     39 class VirtualCamera;    // From VirtualCamera.h
     40 
     41 
     42 // This class wraps the actual hardware IEvsCamera objects.  There is a one to many
     43 // relationship between instances of this class and instances of the VirtualCamera class.
     44 // This class implements the IEvsCameraStream interface so that it can receive the video
     45 // stream from the hardware camera and distribute it to the associated VirtualCamera objects.
     46 class HalCamera : public IEvsCameraStream {
     47 public:
     48     HalCamera(sp<IEvsCamera> hwCamera) : mHwCamera(hwCamera) {};
     49 
     50     // Factory methods for client VirtualCameras
     51     sp<VirtualCamera>   makeVirtualCamera();
     52     void                disownVirtualCamera(sp<VirtualCamera> virtualCamera);
     53 
     54     // Implementation details
     55     sp<IEvsCamera>      getHwCamera()       { return mHwCamera; };
     56     unsigned            getClientCount()    { return mClients.size(); };
     57     bool                changeFramesInFlight(int delta);
     58 
     59     Return<EvsResult>   clientStreamStarting();
     60     void                clientStreamEnding();
     61     Return<void>        doneWithFrame(const BufferDesc& buffer);
     62 
     63     // Methods from ::android::hardware::automotive::evs::V1_0::ICarCameraStream follow.
     64     Return<void> deliverFrame(const BufferDesc& buffer)  override;
     65 
     66 private:
     67     sp<IEvsCamera>                  mHwCamera;
     68     std::list<wp<VirtualCamera>>    mClients;   // Weak pointers -> objects destruct if client dies
     69 
     70     enum {
     71         STOPPED,
     72         RUNNING,
     73         STOPPING,
     74     }                               mStreamState = STOPPED;
     75 
     76     struct FrameRecord {
     77         uint32_t    frameId;
     78         uint32_t    refCount;
     79         FrameRecord(uint32_t id) : frameId(id), refCount(0) {};
     80     };
     81     std::vector<FrameRecord>        mFrames;
     82 };
     83 
     84 } // namespace implementation
     85 } // namespace V1_0
     86 } // namespace evs
     87 } // namespace automotive
     88 } // namespace android
     89 
     90 #endif  // ANDROID_AUTOMOTIVE_EVS_V1_0_HALCAMERA_H
     91