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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_CAMERAPROXY_H
     18 #define ANDROID_AUTOMOTIVE_EVS_V1_0_CAMERAPROXY_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 <deque>
     26 
     27 
     28 using namespace ::android::hardware::automotive::evs::V1_0;
     29 using ::android::hardware::Return;
     30 using ::android::hardware::Void;
     31 using ::android::hardware::hidl_handle;
     32 
     33 namespace android {
     34 namespace automotive {
     35 namespace evs {
     36 namespace V1_0 {
     37 namespace implementation {
     38 
     39 
     40 class HalCamera;        // From HalCamera.h
     41 
     42 
     43 // This class represents an EVS camera to the client application.  As such it presents
     44 // the IEvsCamera interface, and also proxies the frame delivery to the client's
     45 // IEvsCameraStream object.
     46 class VirtualCamera : public IEvsCamera {
     47 public:
     48     explicit VirtualCamera(sp<HalCamera> halCamera);
     49     virtual ~VirtualCamera();
     50     void                shutdown();
     51 
     52     sp<HalCamera>       getHalCamera()      { return mHalCamera; };
     53     unsigned            getAllowedBuffers() { return mFramesAllowed; };
     54     bool                isStreaming()       { return mStreamState == RUNNING; }
     55 
     56     // Proxy to receive frames and forward them to the client's stream
     57     bool                deliverFrame(const BufferDesc& buffer);
     58 
     59     // Methods from ::android::hardware::automotive::evs::V1_0::IEvsCamera follow.
     60     Return<void>        getCameraInfo(getCameraInfo_cb _hidl_cb)  override;
     61     Return<EvsResult>   setMaxFramesInFlight(uint32_t bufferCount) override;
     62     Return<EvsResult>   startVideoStream(const ::android::sp<IEvsCameraStream>& stream) override;
     63     Return<void>        doneWithFrame(const BufferDesc& buffer) override;
     64     Return<void>        stopVideoStream() override;
     65     Return<int32_t>     getExtendedInfo(uint32_t opaqueIdentifier) override;
     66     Return<EvsResult>   setExtendedInfo(uint32_t opaqueIdentifier, int32_t opaqueValue) override;
     67 
     68 private:
     69     sp<HalCamera>           mHalCamera;     // The low level camera interface that backs this proxy
     70     sp<IEvsCameraStream>    mStream;
     71 
     72     std::deque<BufferDesc>  mFramesHeld;
     73     unsigned                mFramesAllowed  = 1;
     74     enum {
     75         STOPPED,
     76         RUNNING,
     77         STOPPING,
     78     }                       mStreamState    = STOPPED;
     79 };
     80 
     81 } // namespace implementation
     82 } // namespace V1_0
     83 } // namespace evs
     84 } // namespace automotive
     85 } // namespace android
     86 
     87 #endif  // ANDROID_AUTOMOTIVE_EVS_V1_0_CAMERAPROXY_H
     88