CCV使用两个PGR Firefly摄像头源码(二)----添加线程

声明：欢迎任何人和组织转载本blog中文章，但必须标记文章原始链接和作者信息。  

本文链接：http://blog.csdn.net/li_007/archive/2009/12/18/5033184.aspx

开拓进取的小乌龟------->CSDN点滴点点滴滴Blog

现在将增加了线程来处理摄像头获取数据的源码贴出来，方便大家讨论，与上一篇blog的代码有一点点修改。主要是继承了openframeworks的ofxThread类，ofxThread很方便我们增加线程。但是如果单独测试有点麻烦的，当然你可以建立一个openframeworks的过程来测试。代码如下，希望大家讨论，留言，改进，互相进步！

//// PGRFireFlyMultiCamera.h////// Written by Leezhm, 15th Dec, 2009// Contact : [e-mail]// Last Modified by Leezhm, 18th Dec, 2009// Copyright(c) Leezhm All rights reserved// #ifndef __h_PGRFireflyMultiCamera__#define __h_PGRFireflyMultiCamera__#include "PGRFlyCapture.h"#include "PGRFlyCapturePlus.h"#include "ofxThread.h"#include <iostream>using std::cout;using std::endl;const unsigned int MAX_CAMERA_COUNT = 2;class PGRFireflyMultiCamera : public ofxThread{private:static unsigned int camCount;int camHeight;int camWidth;FlyCaptureContext context[MAX_CAMERA_COUNT];public:FlyCaptureImagePlus * fcImagePlus;public:PGRFireflyMultiCamera();~PGRFireflyMultiCamera();public:static unsigned int getCameraCount();inline void showErrorMessage(FlyCaptureError & err, char * pFun){if (FLYCAPTURE_OK != err){cout<<"Error : "<<*pFun<<" --> "<<flycaptureErrorToString(err)<<endl;}}void start(){startThread(true, false); // blocking, verbose}void stop(){stopThread();}public:void initFireflyCamera(int width,int height, int framerate);int getCamWidth();int getCamHeight();void listDevices();bool isFrameNew();unsigned char* getPixels();void threadedFunction();};#endif // __h_PGRFireflyMultiCamera__

下面是CPP文件，基本没变动的，注意下析构函数中停止线程。

//// PGRFireFlyMultiCamera.cpp//#include "PGRFireFlyMultiCamera.h"unsigned int PGRFireflyMultiCamera::camCount = MAX_CAMERA_COUNT;PGRFireflyMultiCamera::PGRFireflyMultiCamera(){fcImagePlus = NULL;}PGRFireflyMultiCamera::~PGRFireflyMultiCamera(){FlyCaptureError err;unsigned int uiCamera = 0;if (isThreadRunning()){stop();}if (NULL != fcImagePlus->image.pData){delete [] fcImagePlus->image.pData;}if (NULL != fcImagePlus){delete fcImagePlus;}//// Stop all cameras from grabbing and destroy their contexts.//for( uiCamera = 0; uiCamera < camCount; uiCamera++ ){err = ::flycaptureStop(context[uiCamera] );showErrorMessage(err, "flycaptureStop()");err = ::flycaptureDestroyContext(context[uiCamera]);showErrorMessage(err, "flycaptureBusEnumerateCameras()");}}void PGRFireflyMultiCamera::listDevices(){FlyCaptureError err;FlyCaptureInfoEx info[MAX_CAMERA_COUNT];//// Enumerate the bus and get the count of camera//err = ::flycaptureBusEnumerateCamerasEx(info, &camCount);if (FLYCAPTURE_OK != err){cout<<"PGRFireflyMultiCamera::flycaptureBusEnumerateCamerasEx() : " <<flycaptureErrorToString(err)<<endl;}else{for( unsigned int uiBusIndex = 0; uiBusIndex < camCount; uiBusIndex++ ){FlyCaptureInfoEx* pinfo = &info[uiBusIndex];cout<<"Index "<<uiBusIndex<<": "<<pinfo->pszModelName<<", SerialNumber: "<<pinfo->SerialNumber<<endl;}cout<<"end of listing FFMV/n/n";}}unsigned int PGRFireflyMultiCamera::getCameraCount(){if (0 == camCount){::flycaptureBusCameraCount(&camCount);}return camCount;}void PGRFireflyMultiCamera::initFireflyCamera(int width,int height, int framerate){FlyCaptureError err;unsigned int uiCamera = 0;//// Create a context for and initialize every camera on the bus.//for( uiCamera = 0; uiCamera < camCount; uiCamera++ ){err = ::flycaptureCreateContext(&context[uiCamera]);showErrorMessage(err, "flycaptureCreateContext()");cout<<"Initializing camera "<<uiCamera<<endl;err = ::flycaptureInitialize(context[uiCamera], uiCamera);showErrorMessage(err, "flycaptureInitializePlus()");}FlyCaptureFrameRate setFrameRate; if (60 == framerate){setFrameRate = FLYCAPTURE_FRAMERATE_60;}else if (30 == framerate){setFrameRate = FLYCAPTURE_FRAMERATE_30;}else if (15 == framerate){setFrameRate = FLYCAPTURE_FRAMERATE_15;}//// Start all of the cameras grabbing//for( uiCamera = 0; uiCamera < camCount; uiCamera++ ){ cout<<"Starting camera./n/n";err = ::flycaptureStartLockNext(context[uiCamera], FLYCAPTURE_VIDEOMODE_640x480Y8, setFrameRate);showErrorMessage(err, "flycaptureStart()");}//// Having started all of the cameras synchronize all of their buffers.// Please note that cameras running at the same frame rate on the same// bus will automatically synchronize to each other. This call is for// purposes of synchronizing the buffers.//err = ::flycaptureSyncForLockNext(context, camCount);showErrorMessage(err, "flycaptureSyncForLockNext()");if (2 == camCount){if (NULL == fcImagePlus){fcImagePlus = new FlyCaptureImagePlus();}fcImagePlus->image.iCols = width;fcImagePlus->image.iRows = height;if (NULL == fcImagePlus->image.pData){fcImagePlus->image.pData = new unsigned char[fcImagePlus->image.iRows * fcImagePlus->image.iCols];memset(fcImagePlus->image.pData, 0, fcImagePlus->image.iRows * fcImagePlus->image.iCols);}}else{cout<<"there are more than 2 cameras!/n";getchar();return ;}}int PGRFireflyMultiCamera::getCamWidth(){camWidth = fcImagePlus->image.iCols;return camWidth;}int PGRFireflyMultiCamera::getCamHeight(){camHeight = fcImagePlus->image.iRows;return camHeight;}unsigned char * PGRFireflyMultiCamera::getPixels(void){return fcImagePlus->image.pData;}bool PGRFireflyMultiCamera::isFrameNew(){return isThreadRunning();}void PGRFireflyMultiCamera::threadedFunction(){unsigned int uiCamera = 0;FlyCaptureError err;FlyCaptureImagePlus tmpImage[MAX_CAMERA_COUNT];while(isThreadRunning()){//// Lock images.//for (uiCamera = 0; uiCamera < camCount; uiCamera ++){err = flycaptureLockNext(context[uiCamera], &tmpImage[uiCamera]);if( err != FLYCAPTURE_OK ){ cout<<"flycaptureLockNext(): "<<flycaptureErrorToString(err)<<endl; return ;} }#pragma omp parallel forfor (int row = 0; row < camHeight; row ++){memcpy((fcImagePlus->image.pData + (row * camWidth)), (tmpImage[0].image.pData + (row * camWidth / 2)), camWidth / 2);memcpy((fcImagePlus->image.pData + (row * camWidth) + camWidth / 2), (tmpImage[1].image.pData + (row * camWidth / 2)), camWidth / 2);}//// Unlock all of the images effectively handing them back to the buffer pool.//for( uiCamera = 0; uiCamera < camCount; uiCamera++ ){err = ::flycaptureUnlock(context[uiCamera], tmpImage[uiCamera].uiBufferIndex );if( err != FLYCAPTURE_OK ){ cout<<"flycaptureUnlock(): "<<flycaptureErrorToString(err)<<endl; return ;} }}}

 

这次增加了线程后，解决了视频延时的问题。可以测试达到30帧。