f4334277
 Hu Chunming
提交3rdparty
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// videoio to XAML bridge for OpenCV
// Copyright (c) Microsoft Open Technologies, Inc.
// All rights reserved.
//
// (3 - clause BSD License)
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that
// the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
// following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
// following disclaimer in the documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or
// promote products derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED.IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES(INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT(INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
#pragma once
// this header is included in the XAML App, so it cannot include any
// OpenCV headers, or a static assert will be raised
#include <ppl.h>
#include <ppltasks.h>
#include <concrt.h>
#include <agile.h>
#include <opencv2\core.hpp>
#include <mutex>
#include <memory>
#include <atomic>
#include <functional>
// Class VideoioBridge (singleton) is needed because the interface for
// VideoCapture_WinRT in cap_winrt_capture.hpp is fixed by OpenCV.
class VideoioBridge
{
public:
static VideoioBridge& getInstance();
// call after initialization
void setReporter(Concurrency::progress_reporter<int> pr) { reporter = pr; }
// to be called from cvMain via cap_winrt on bg thread - non-blocking (async)
void requestForUIthreadAsync(int action);
// TODO: modify in window.cpp: void cv::imshow( const String& winname, InputArray _img )
void imshow(/*cv::InputArray matToShow*/); // shows Mat in the cvImage element
void swapInputBuffers();
void allocateOutputBuffers();
void swapOutputBuffers();
void updateFrameContainer();
bool openCamera();
void allocateBuffers(int width, int height);
int getDeviceIndex();
void setDeviceIndex(int index);
int getWidth();
void setWidth(int width);
int getHeight();
void setHeight(int height);
std::atomic<bool> bIsFrameNew;
std::mutex inputBufferMutex; // input is double buffered
unsigned char * frontInputPtr; // OpenCV reads this
unsigned char * backInputPtr; // Video grabber writes this
std::atomic<unsigned long> frameCounter;
unsigned long currentFrame;
std::mutex outputBufferMutex; // output is double buffered
Windows::UI::Xaml::Media::Imaging::WriteableBitmap^ frontOutputBuffer; // OpenCV write this
Windows::UI::Xaml::Media::Imaging::WriteableBitmap^ backOutputBuffer; // XAML reads this
Windows::UI::Xaml::Controls::Image ^cvImage;
private:
VideoioBridge() {
deviceIndex = 0;
width = 640;
height = 480;
deviceReady = false;
bIsFrameNew = false;
currentFrame = 0;
frameCounter = 0;
};
// singleton
VideoioBridge(VideoioBridge const &);
void operator=(const VideoioBridge &);
std::atomic<bool> deviceReady;
Concurrency::progress_reporter<int> reporter;
// Mats are wrapped with singleton class, we do not support more than one
// capture device simultaneously with the design at this time
//
// nb. inputBufferMutex was not able to guarantee that OpenCV Mats were
// ready to accept data in the UI thread (memory access exceptions were thrown
// even though buffer address was good).
// Therefore allocation of Mats is also done on the UI thread before the video
// device is initialized.
cv::Mat frontInputMat;
cv::Mat backInputMat;
int deviceIndex, width, height;
};
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