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/IEvsCamera.h>
21 #include <android/hardware/automotive/evs/1.0/types.h>
22 #include <ui/GraphicBuffer.h>
23 
24 #include <list>
25 #include <thread>
26 
27 using namespace ::android::hardware::automotive::evs::V1_0;
28 using ::android::hardware::hidl_handle;
29 using ::android::hardware::Return;
30 
31 namespace android {
32 namespace automotive {
33 namespace evs {
34 namespace V1_0 {
35 namespace implementation {
36 
37 class VirtualCamera;  // From VirtualCamera.h
38 
39 // This class wraps the actual hardware IEvsCamera objects.  There is a one to many
40 // relationship between instances of this class and instances of the VirtualCamera class.
41 // This class implements the IEvsCameraStream interface so that it can receive the video
42 // stream from the hardware camera and distribute it to the associated VirtualCamera objects.
43 class HalCamera : public IEvsCameraStream {
44 public:
HalCamera(sp<IEvsCamera> hwCamera)45     HalCamera(sp<IEvsCamera> hwCamera) : mHwCamera(hwCamera) {};
46 
47     // Factory methods for client VirtualCameras
48     sp<VirtualCamera> makeVirtualCamera();
49     void disownVirtualCamera(sp<VirtualCamera> virtualCamera);
50 
51     // Implementation details
getHwCamera()52     sp<IEvsCamera> getHwCamera() { return mHwCamera; };
getClientCount()53     unsigned getClientCount() { return mClients.size(); };
54     bool changeFramesInFlight(int delta);
55 
56     Return<EvsResult> clientStreamStarting();
57     void clientStreamEnding();
58     Return<void> doneWithFrame(const BufferDesc& buffer);
59 
60     // Methods from ::android::hardware::automotive::evs::V1_0::ICarCameraStream follow.
61     Return<void> deliverFrame(const BufferDesc& buffer) override;
62 
63 private:
64     sp<IEvsCamera> mHwCamera;
65     std::list<wp<VirtualCamera>> mClients;  // Weak pointers -> objects destruct if client dies
66 
67     enum {
68         STOPPED,
69         RUNNING,
70         STOPPING,
71     } mStreamState = STOPPED;
72 
73     struct FrameRecord {
74         uint32_t frameId;
75         uint32_t refCount;
FrameRecordFrameRecord76         FrameRecord(uint32_t id) : frameId(id), refCount(0) {};
77     };
78     std::vector<FrameRecord> mFrames;
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_HALCAMERA_H
88