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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef AUTOMOTIVE_EVS_VTS_FRAMEHANDLER_H
#define AUTOMOTIVE_EVS_VTS_FRAMEHANDLER_H
#include <aidl/android/hardware/automotive/evs/BnEvsCameraStream.h>
#include <aidl/android/hardware/automotive/evs/EvsEventDesc.h>
#include <aidl/android/hardware/automotive/evs/IEvsCamera.h>
#include <aidl/android/hardware/automotive/evs/IEvsDisplay.h>
#include <mutex>
#include <queue>
/*
* FrameHandler:
* This class can be used to receive camera imagery from an IEvsCamera implementation. Given an
* IEvsDisplay instance at startup, it will forward the received imagery to the display,
* providing a trivial implementation of a rear vew camera type application.
* Note that the video frames are delivered on a background thread, while the control interface
* is actuated from the applications foreground thread.
*/
class FrameHandler : public ::aidl::android::hardware::automotive::evs::BnEvsCameraStream {
public:
enum BufferControlFlag {
eAutoReturn,
eNoAutoReturn,
};
FrameHandler(
const std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsCamera>& pCamera,
const ::aidl::android::hardware::automotive::evs::CameraDesc& cameraInfo,
const std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsDisplay>&
pDisplay,
BufferControlFlag mode = eAutoReturn);
virtual ~FrameHandler() {
if (mCamera != nullptr) {
/* shutdown a camera explicitly */
shutdown();
}
}
void shutdown();
bool startStream();
void asyncStopStream();
void blockingStopStream();
bool returnHeldBuffer();
bool isRunning();
void waitForFrameCount(unsigned frameCount);
bool waitForEvent(const ::aidl::android::hardware::automotive::evs::EvsEventDesc& aTargetEvent,
::aidl::android::hardware::automotive::evs::EvsEventDesc& aReceivedEvent,
bool ignorePayload = false);
void getFramesCounters(unsigned* received, unsigned* displayed);
void getFrameDimension(unsigned* width, unsigned* height);
private:
// Methods from ::aidl::android::hardware::automotive::evs::IEvsCameraStream follow.
::ndk::ScopedAStatus deliverFrame(
const std::vector<::aidl::android::hardware::automotive::evs::BufferDesc>& buffer)
override;
::ndk::ScopedAStatus notify(
const ::aidl::android::hardware::automotive::evs::EvsEventDesc& event) override;
// Local implementation details
bool copyBufferContents(
const ::aidl::android::hardware::automotive::evs::BufferDesc& tgtBuffer,
const ::aidl::android::hardware::automotive::evs::BufferDesc& srcBuffer);
const char* eventToString(const ::aidl::android::hardware::automotive::evs::EvsEventType aType);
std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsCamera> mCamera;
::aidl::android::hardware::automotive::evs::CameraDesc mCameraInfo;
std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsDisplay> mDisplay;
BufferControlFlag mReturnMode;
// Since we get frames delivered to us asynchronously via the IEvsCameraStream interface,
// we need to protect all member variables that may be modified while we're streaming
// (ie: those below)
std::mutex mLock;
std::mutex mEventLock;
std::condition_variable mEventSignal;
std::condition_variable mFrameSignal;
std::queue<std::vector<::aidl::android::hardware::automotive::evs::BufferDesc>> mHeldBuffers;
bool mRunning = false;
unsigned mFramesReceived = 0; // Simple counter -- rolls over eventually!
unsigned mFramesDisplayed = 0; // Simple counter -- rolls over eventually!
unsigned mFrameWidth = 0;
unsigned mFrameHeight = 0;
::aidl::android::hardware::automotive::evs::EvsEventDesc mLatestEventDesc;
};
#endif // AUTOMOTIVE_EVS_VTS_FRAMEHANDLER_H
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