83 lines
3.2 KiB
C++
83 lines
3.2 KiB
C++
/*
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* Copyright (C) 2021 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 SERVICE_JNI_EVS_STREAMHANDLER_H_
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#define SERVICE_JNI_EVS_STREAMHANDLER_H_
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#include "EvsServiceCallback.h"
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#include <aidl/android/hardware/automotive/evs/BnEvsCameraStream.h>
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#include <aidl/android/hardware/automotive/evs/BufferDesc.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/graphics/common/HardwareBuffer.h>
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#include <android-base/thread_annotations.h>
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#include <android/binder_auto_utils.h>
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#include <list>
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namespace android::automotive::evs {
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/*
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* StreamHandler:
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* This class can be used to receive camera imagery from an IEvsCamera implementation. It will
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* hold onto the most recent image buffer, returning older ones.
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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 StreamHandler final : public ::aidl::android::hardware::automotive::evs::BnEvsCameraStream {
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public:
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StreamHandler(
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const std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsCamera>& camObj,
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EvsServiceCallback* callback, int maxNumFramesInFlight);
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virtual ~StreamHandler();
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void shutdown();
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bool startStream();
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bool asyncStopStream();
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void blockingStopStream();
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bool isRunning();
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void doneWithFrame(const ::aidl::android::hardware::automotive::evs::BufferDesc& buffer);
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void doneWithFrame(int bufferId);
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private:
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// Implementation for ::aidl::android::hardware::automotive::evs::IEvsCameraStream
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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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// Values initialized as startup
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std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsCamera> mEvsCamera;
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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 mCondition;
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bool mRunning GUARDED_BY(mLock) = false;
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// Callbacks to forward EVS events and frames
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EvsServiceCallback* mCallback;
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std::list<::aidl::android::hardware::automotive::evs::BufferDesc> mReceivedBuffers
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GUARDED_BY(mLock);
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int mMaxNumFramesInFlight;
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};
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} // namespace android::automotive::evs
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#endif // SERVICE_JNI_EVS_STREAMHANDLER_H_
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