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:
HalCamera(sp<IEvsCamera> hwCamera)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
getHwCamera()55     sp<IEvsCamera>      getHwCamera()       { return mHwCamera; };
getClientCount()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;
FrameRecordFrameRecord79         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