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95 lines
3.4 KiB
95 lines
3.4 KiB
4 months ago
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef EVS_VTS_FRAMEHANDLER_H
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#define EVS_VTS_FRAMEHANDLER_H
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#include <queue>
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#include <android/hardware/automotive/evs/1.0/IEvsCameraStream.h>
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#include <android/hardware/automotive/evs/1.0/IEvsCamera.h>
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#include <android/hardware/automotive/evs/1.0/IEvsDisplay.h>
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using namespace ::android::hardware::automotive::evs::V1_0;
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using ::android::hardware::Return;
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using ::android::hardware::Void;
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using ::android::hardware::hidl_vec;
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using ::android::hardware::hidl_handle;
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using ::android::sp;
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/*
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* FrameHandler:
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* This class can be used to receive camera imagery from an IEvsCamera implementation. Given an
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* IEvsDisplay instance at startup, it will forward the received imagery to the display,
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* providing a trivial implementation of a rear vew camera type application.
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* Note that the video frames are delivered on a background thread, while the control interface
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* is actuated from the applications foreground thread.
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*/
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class FrameHandler : public IEvsCameraStream {
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public:
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enum BufferControlFlag {
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eAutoReturn,
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eNoAutoReturn,
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};
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FrameHandler(android::sp <IEvsCamera> pCamera, CameraDesc cameraInfo,
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android::sp <IEvsDisplay> pDisplay = nullptr,
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BufferControlFlag mode = eAutoReturn);
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void shutdown();
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bool startStream();
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void asyncStopStream();
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void blockingStopStream();
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bool returnHeldBuffer();
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bool isRunning();
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void waitForFrameCount(unsigned frameCount);
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void getFramesCounters(unsigned* received, unsigned* displayed);
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void getFrameDimension(unsigned* width, unsigned* height);
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private:
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// Implementation for ::android::hardware::automotive::evs::V1_0::ICarCameraStream
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Return<void> deliverFrame(const BufferDesc& buffer) override;
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// Local implementation details
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bool copyBufferContents(const BufferDesc& tgtBuffer, const BufferDesc& srcBuffer);
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// Values initialized as startup
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android::sp <IEvsCamera> mCamera;
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CameraDesc mCameraInfo;
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android::sp <IEvsDisplay> mDisplay;
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BufferControlFlag mReturnMode;
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// Since we get frames delivered to us asnchronously via the ICarCameraStream interface,
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// we need to protect all member variables that may be modified while we're streaming
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// (ie: those below)
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std::mutex mLock;
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std::condition_variable mSignal;
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std::queue<BufferDesc> mHeldBuffers;
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bool mRunning = false;
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unsigned mFramesReceived = 0; // Simple counter -- rolls over eventually!
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unsigned mFramesDisplayed = 0; // Simple counter -- rolls over eventually!
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unsigned mFrameWidth = 0;
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unsigned mFrameHeight = 0;
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};
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#endif //EVS_VTS_FRAMEHANDLER_H
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