106 lines
4.4 KiB
C++
106 lines
4.4 KiB
C++
/*
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* Copyright (C) 2022 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 AUTOMOTIVE_EVS_VTS_FRAMEHANDLER_H
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#define AUTOMOTIVE_EVS_VTS_FRAMEHANDLER_H
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#include <aidl/android/hardware/automotive/evs/BnEvsCameraStream.h>
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#include <aidl/android/hardware/automotive/evs/EvsEventDesc.h>
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#include <aidl/android/hardware/automotive/evs/IEvsCamera.h>
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#include <aidl/android/hardware/automotive/evs/IEvsDisplay.h>
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#include <mutex>
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#include <queue>
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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 ::aidl::android::hardware::automotive::evs::BnEvsCameraStream {
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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(
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const std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsCamera>& pCamera,
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const ::aidl::android::hardware::automotive::evs::CameraDesc& cameraInfo,
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const std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsDisplay>&
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pDisplay,
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BufferControlFlag mode = eAutoReturn);
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virtual ~FrameHandler() {
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if (mCamera != nullptr) {
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/* shutdown a camera explicitly */
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shutdown();
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}
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}
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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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bool waitForEvent(const ::aidl::android::hardware::automotive::evs::EvsEventDesc& aTargetEvent,
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::aidl::android::hardware::automotive::evs::EvsEventDesc& aReceivedEvent,
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bool ignorePayload = false);
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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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// Methods from ::aidl::android::hardware::automotive::evs::IEvsCameraStream follow.
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::ndk::ScopedAStatus deliverFrame(
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const std::vector<::aidl::android::hardware::automotive::evs::BufferDesc>& buffer)
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override;
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::ndk::ScopedAStatus notify(
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const ::aidl::android::hardware::automotive::evs::EvsEventDesc& event) override;
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// Local implementation details
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bool copyBufferContents(
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const ::aidl::android::hardware::automotive::evs::BufferDesc& tgtBuffer,
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const ::aidl::android::hardware::automotive::evs::BufferDesc& srcBuffer);
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const char* eventToString(const ::aidl::android::hardware::automotive::evs::EvsEventType aType);
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std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsCamera> mCamera;
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::aidl::android::hardware::automotive::evs::CameraDesc mCameraInfo;
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std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsDisplay> mDisplay;
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BufferControlFlag mReturnMode;
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// Since we get frames delivered to us asynchronously via the IEvsCameraStream 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::mutex mEventLock;
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std::condition_variable mEventSignal;
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std::condition_variable mFrameSignal;
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std::queue<std::vector<::aidl::android::hardware::automotive::evs::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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::aidl::android::hardware::automotive::evs::EvsEventDesc mLatestEventDesc;
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};
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#endif // AUTOMOTIVE_EVS_VTS_FRAMEHANDLER_H
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