股票交易JAVA开发接口-Ubuntu v4l2 视屏流花屏问题

之前用的好好解析YUV，MJPEG,换了个核心板就不好使了，opencv6>>>opencvMat，cvMat，IplImage的类型转换也不好使了。
//old version
#include "camera_thread.h"
#include <QByteArray>
#include <QImageReader>
#include <QBuffer>
#include <QImage>
#include <QDebug>
#include <QMutex>
#include <ctime>
#include <QString>
#include <QTimer>

#include <utils.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <stdbool.h>
#include <unistd.h>

#include <linux/videodev2.h>

#include<opencv2/opencv.hpp>
#include<opencv2/highgui/highgui.hpp>
//#include "opencv2/core/types_c.h"

#include "device.h"
#include "qtimer.h"
#include "camera2.h"
#include "numeric"


int init_v4l2(void);
int v4l2_grab(void);

#define IMAGEWIDTH 640
#define IMAGEHEIGHT 480

#define FILE_VIDEO1 "/dev/video10"
#define TRUE 1
#define FALSE 0



char *deviceid;


using namespace cv;

QImageReader reader;



video_thread::video_thread():QThread()
{
    quit_flag = false;
}

video_thread::~video_thread()
{
    this->quit();
    quit_flag = true;
    show_picture_flag = false;
    this->wait();
}

void video_thread::run()
{
    int close_ret = 0;

    if(device_video==1){
        deviceid= "/dev/video0";
    }else{
        deviceid= "/dev/video2";
    }


  if(init_v4l2() == FALSE){

      quit_flag = true;
      exit(1);
  }

  if(v4l2_grab() == FALSE){

      quit_flag = true;
      exit(2);
  }
    buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    buf.memory = V4L2_MEMORY_MMAP;


    isopen = true;


    IplImage* img;
    IplImage* img1;

    CvMat cvmat;
    double t;
    QImage *qmg;
    while(!quit_flag)
    {
        msleep(1);
        // not show picture, continue next loop.
        if ( !show_picture_flag )
            continue;


       t = (double)cvGetTickCount();



       ioctl(fd,VIDIOC_DQBUF,&buf);

       buf.index = 0;
       cvmat =cvMat(IMAGEHEIGHT,IMAGEWIDTH,CV_8UC3,(void*)buffer);//CV_8UC3


       img = cvDecodeImage(&cvmat,1);


       cv::Mat MImg=cv::cvarrToMat(img);//Mat

//       MImg=MImg(cv::Rect(0,0,630,470));

       cv::rotate(MImg,MImg,cv::ROTATE_180);


 

      IplImage iplImage1(MImg);
      img1=&iplImage1;

       qmg=new QImage((unsigned char*)img1->imageData,img1->width,img1->height,img1->widthStep,QImage::Format_RGB888);

       if(!img)    qDebug("CAM2 No img
");

       cvReleaseImage(&img);

       ioctl(fd,VIDIOC_QBUF,&buf);
       t=(double)cvGetTickCount()-t;

       if(device_video==1){

           emit image_data(qmg->copy());
       }
       if(device_video==2){

           emit image_data1(qmg->copy());
       }


    }

    type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    close_ret = ioctl(fd,VIDIOC_STREAMOFF,&type);







    close_ret = close( fd );

    if ( close_ret == 0 )
    {
       qDebug("close success!");
    }
}

int video_thread::init_v4l2(void){



        if ((fd = open(deviceid, O_RDWR)) == -1){

            return FALSE;
        }
        if(fcntl(fd,F_SETFD, FD_CLOEXEC) == -1)
        {

        }
        if (ioctl(fd, VIDIOC_QUERYCAP, &cap) == -1){

                return FALSE;
        }
        else
        {}


        fmtdesc.index = 0;
        fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

        while(ioctl(fd,VIDIOC_ENUM_FMT,&fmtdesc) != -1){

            fmtdesc.index++;
        }
        //set fmt
        fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        fmt.fmt.pix.width = IMAGEWIDTH;
        fmt.fmt.pix.height = IMAGEHEIGHT;
//        fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_MJPEG; //*************************V4L2_PIX_FMT_YUYV****************
        fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_MJPEG; //*************************V4L2_PIX_FMT_YUYV****************
        fmt.fmt.pix.field = V4L2_FIELD_NONE;



        if (ioctl(fd, VIDIOC_S_FMT, &fmt) == -1){
//            if (ioctl(fd, VIDIOC_TRY_FMT, &fmt) == -1){

            return FALSE;
        }
        if(ioctl(fd,VIDIOC_G_FMT,&fmt) == -1){

            return FALSE;
        }

        return TRUE;
}





int video_thread::v4l2_grab(void){
    //struct v4l2_requestbuffers req = {0};
    //4  request for 4 buffers
    req.count = 1;
    req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    req.memory = V4L2_MEMORY_MMAP;

    if (ioctl(fd, VIDIOC_REQBUFS, &req) == -1)
    {

        return FALSE;
    }
    //5 mmap for buffers
    buffer = (uchar*)malloc(req.count * sizeof(*buffer));
    if(!buffer){

        return FALSE;
    }
    unsigned int n_buffers;
    for(n_buffers = 0;n_buffers < req.count; n_buffers++){
    //struct v4l2_buffer buf = {0};
    buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    buf.memory = V4L2_MEMORY_MMAP;
    buf.index = n_buffers;
    if(ioctl(fd, VIDIOC_QUERYBUF, &buf) == -1){

        return FALSE;
        }



    buffer = (uchar*)mmap (NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, buf.m.offset);

    if(buffer == MAP_FAILED){

        return FALSE;
        }

    }
    //6 queue
    for(n_buffers = 0;n_buffers <req.count;n_buffers++){
        buf.index = n_buffers;
        buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        buf.memory = V4L2_MEMORY_MMAP;
        if(ioctl(fd,VIDIOC_QBUF,&buf)){
//            qDebug("query buffer error
");
            return FALSE;
        }
    }
    //7 starting
    type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    if(ioctl(fd,VIDIOC_STREAMON,&type) == -1){
//        qDebug("stream on error
");
        return FALSE;
    }
    return TRUE;
}
于是换一种打开方式：头文件：
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