You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
3.2 KiB
91 lines
3.2 KiB
/* |
|
* Copyright (C) 2017 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 EVS_VTS_FRAMEHANDLER_H |
|
#define EVS_VTS_FRAMEHANDLER_H |
|
|
|
#include <queue> |
|
|
|
#include <android/hardware/automotive/evs/1.0/IEvsCameraStream.h> |
|
#include <android/hardware/automotive/evs/1.0/IEvsCamera.h> |
|
#include <android/hardware/automotive/evs/1.0/IEvsDisplay.h> |
|
|
|
using namespace ::android::hardware::automotive::evs::V1_0; |
|
using ::android::hardware::Return; |
|
using ::android::hardware::Void; |
|
using ::android::hardware::hidl_vec; |
|
using ::android::hardware::hidl_handle; |
|
using ::android::sp; |
|
|
|
|
|
/* |
|
* 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 IEvsCameraStream { |
|
public: |
|
enum BufferControlFlag { |
|
eAutoReturn, |
|
eNoAutoReturn, |
|
}; |
|
|
|
FrameHandler(android::sp <IEvsCamera> pCamera, CameraDesc cameraInfo, |
|
android::sp <IEvsDisplay> pDisplay = nullptr, |
|
BufferControlFlag mode = eAutoReturn); |
|
void shutdown(); |
|
|
|
bool startStream(); |
|
void asyncStopStream(); |
|
void blockingStopStream(); |
|
|
|
bool returnHeldBuffer(); |
|
|
|
bool isRunning(); |
|
|
|
void waitForFrameCount(unsigned frameCount); |
|
void getFramesCounters(unsigned* received, unsigned* displayed); |
|
|
|
private: |
|
// Implementation for ::android::hardware::automotive::evs::V1_0::ICarCameraStream |
|
Return<void> deliverFrame(const BufferDesc& buffer) override; |
|
|
|
// Local implementation details |
|
bool copyBufferContents(const BufferDesc& tgtBuffer, const BufferDesc& srcBuffer); |
|
|
|
// Values initialized as startup |
|
android::sp <IEvsCamera> mCamera; |
|
CameraDesc mCameraInfo; |
|
android::sp <IEvsDisplay> mDisplay; |
|
BufferControlFlag mReturnMode; |
|
|
|
// Since we get frames delivered to us asnchronously via the ICarCameraStream interface, |
|
// we need to protect all member variables that may be modified while we're streaming |
|
// (ie: those below) |
|
std::mutex mLock; |
|
std::condition_variable mSignal; |
|
|
|
std::queue<BufferDesc> mHeldBuffers; |
|
bool mRunning = false; |
|
unsigned mFramesReceived = 0; // Simple counter -- rolls over eventually! |
|
unsigned mFramesDisplayed = 0; // Simple counter -- rolls over eventually! |
|
}; |
|
|
|
|
|
#endif //EVS_VTS_FRAMEHANDLER_H
|
|
|