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
28using namespace ::android::hardware::automotive::evs::V1_0;
29using ::android::hardware::Return;
30using ::android::hardware::hidl_handle;
31
32namespace android {
33namespace automotive {
34namespace evs {
35namespace V1_0 {
36namespace implementation {
37
38
39class 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.
46class HalCamera : public IEvsCameraStream {
47public:
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
66private:
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