qt视频采集传输？_course

各位高手，我想做在VC++6.0下的用VFW技术的视频采集传输（h.263编码解码），请问有源代码或相关参考吗？

如何用QT把采集到的视频显示出来？ _course

谢谢各位最近在做摄像头的图像采集。图像采集后不知道怎么用QT显示出来。

在arm上利用Qt采集视频图像，能够保存采集的视频图像_course

我使用的是usb免驱摄像头，现在已经实现实时显示图像，并能够拍照保存，但无法实现保存视频。 以下是本程序的相关代码 # main.cpp ``` #include "camera.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); camera w; w.show(); return a.exec(); } ``` # camera.cpp ``` #include "camera.h" #include "ui_camera.h" #include <QDate> #include <QTime> void yuv422to420p(char *yuv422buf, char *yuv420pbuf, int width, int height) { char *src, *dest, *dest2; int i, j; src = yuv422buf; dest = yuv420pbuf; for (i = 0; i < width * height * 2; i++) { if (i % 2 != 0) { continue; } *dest++ = *(src + i); } src = yuv422buf; dest = yuv420pbuf + width * height; dest2 = dest + (width * height) / 4; for (i = 0; i < height; i += 2) { for (j = 1; j < width * 2; j += 4) { *dest++ = *(src + i * width * 2 + j); *dest2++ = *(src + i * width * 2 + j + 2); } } } /* yuv格式转换为rgb格式的算法处理函数 */ int convert_yuv_to_rgb_pixel(int y, int u, int v) { unsigned int pixel32 = 0; unsigned char *pixel = (unsigned char *)&pixel32; int r, g, b; r = y + (1.370705 * (v-128)); g = y - (0.698001 * (v-128)) - (0.337633 * (u-128)); b = y + (1.732446 * (u-128)); if(r > 255) r = 255; if(g > 255) g = 255; if(b > 255) b = 255; if(r < 0) r = 0; if(g < 0) g = 0; if(b < 0) b = 0; pixel[0] = r ; pixel[1] = g ; pixel[2] = b ; return pixel32; } /* yuv格式转换为rgb格式 */ int convert_yuv_to_rgb_buffer(unsigned char *yuv, unsigned char *rgb, unsigned int width, unsigned int height) { unsigned int in, out = 0; unsigned int pixel_16; unsigned char pixel_24[3]; unsigned int pixel32; int y0, u, y1, v; for(in = 0; in < width * height * 2; in += 4) { pixel_16 = yuv[in + 3] << 24 | yuv[in + 2] << 16 | yuv[in + 1] << 8 | yuv[in + 0]; y0 = (pixel_16 & 0x000000ff); u = (pixel_16 & 0x0000ff00) >> 8; y1 = (pixel_16 & 0x00ff0000) >> 16; v = (pixel_16 & 0xff000000) >> 24; pixel32 = convert_yuv_to_rgb_pixel(y0, u, v); pixel_24[0] = (pixel32 & 0x000000ff); pixel_24[1] = (pixel32 & 0x0000ff00) >> 8; pixel_24[2] = (pixel32 & 0x00ff0000) >> 16; rgb[out++] = pixel_24[0]; rgb[out++] = pixel_24[1]; rgb[out++] = pixel_24[2]; pixel32 = convert_yuv_to_rgb_pixel(y1, u, v); pixel_24[0] = (pixel32 & 0x000000ff); pixel_24[1] = (pixel32 & 0x0000ff00) >> 8; pixel_24[2] = (pixel32 & 0x00ff0000) >> 16; rgb[out++] = pixel_24[0]; rgb[out++] = pixel_24[1]; rgb[out++] = pixel_24[2]; } return 0; } int camera::camera_init() { int ret=0,i=0,count=0; struct v4l2_capability cap; //视频设备的功能，对应命令VIDIOC_QUERYCAP struct v4l2_fmtdesc fmtdesc; //视频格式描述符类型 struct v4l2_format format; //帧的格式，如宽度，高度等，对应命令VIDIOC_G_FMT、VIDIOC_S_FMT等 struct v4l2_requestbuffers reqbuf; //向驱动申请帧缓冲请求，包含申请的个数，对应命令VIDIOC_REQBUFS struct v4l2_buffer buf; //驱动中的一帧图像缓存，对应命令VIDIOC_QUERYBUF fmtdesc.index = 0; fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; //传输流类型 ret = ::ioctl(fd, VIDIOC_G_FMT, &format); //'VIDIOC_G_FMT'——读取当前驱动的视频捕获格式 if(ret < 0){ perror("VIDIOC_G_FMT"); exit(1); } printf("width:%d\n", format.fmt.pix.width); printf("height:%d\n", format.fmt.pix.height); printf("pixelformat:%x\n", format.fmt.pix.pixelformat); printf("field:%x\n", format.fmt.pix.field); printf("bytesperline:%d\n", format.fmt.pix.bytesperline); printf("sizeimage:%d\n", format.fmt.pix.sizeimage); printf("colorspace:%d\n", format.fmt.pix.colorspace); format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; format.fmt.pix.width = 640; format.fmt.pix.height = 480; format.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV; ret = ::ioctl(fd, VIDIOC_S_FMT, &format); if(ret < 0){ fprintf(stderr, "Not support jepg"); perror("VIDIOC_S_FMT"); exit(1); } reqbuf.count = 3; reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; reqbuf.memory = V4L2_MEMORY_MMAP; ret = ::ioctl(fd, VIDIOC_REQBUFS, &reqbuf); if(ret < 0){ perror("VIDIOC_REQBUFS"); exit(1); } bufinf = (struct bufinfor *)calloc(reqbuf.count, sizeof(struct bufinfor)); if(!bufinf){ perror("calloc"); exit(1); } for(count = 0; count < reqbuf.count; count++){ buf.index = count; buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; ret = ::ioctl(fd, VIDIOC_QUERYBUF, &buf); if(ret < 0){ perror("VIDIOC_REQBUFS"); exit(1); } bufinf[buf.index].length = buf.length; bufinf[buf.index].start = mmap(NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, buf.m.offset); if(!(bufinf[buf.index].start)){ perror("mmap"); exit(1); } } for(i = 0; i < reqbuf.count; i++){ buf.index = i; buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; ret = ::ioctl(fd, VIDIOC_QBUF, &buf); if(ret < 0){ perror("VIDIOC_QBUF"); exit(1); } } enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE; ret = ::ioctl(fd, VIDIOC_STREAMON, &type); if(ret < 0){ perror("VIDIOC_STREAMON"); exit(1); } return 0; } camera::camera(QWidget *parent) : QMainWindow(parent), ui(new Ui::camera) { char devname[32]; int i=0; int ret; struct v4l2_capability cap; ui->setupUi(this); while(i < 100) { sprintf(devname,"/dev/video%d",i++); fd = ::open(devname,O_RDWR); if(fd < 0) { continue; } ui->comboBox->addItem(QWidget::tr(devname)); ::close(fd); } } camera::~camera() { free(bufinf); ::close(fd); delete ui; } void camera::moveEvent(QMoveEvent *) { this->move(QPoint(0,0)); } void camera::resizeEvent(QResizeEvent *) { this->showMaximized(); } void camera::on_pushButton_2_clicked() { take_photo(); } static bool take = 0; void camera::show_() { int ret; unsigned char *rgb=new unsigned char [640 * 480 *3]; struct v4l2_buffer buf; fd_set readset; FD_ZERO(&readset); FD_SET(fd, &readset); ret = select(fd + 1, &readset, NULL, NULL, NULL); if(ret < 0){ perror("select"); exit(1); } buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; ret = ioctl(fd, VIDIOC_DQBUF, &buf); if(ret < 0){ perror("VIDIOC_DQBUF"); exit(1); } convert_yuv_to_rgb_buffer((unsigned char *)bufinf[buf.index].start,rgb,640,480); ret = ioctl(fd, VIDIOC_QBUF, &buf); if(ret < 0){ perror("VIDIOC_QBUF"); exit(1); } QImage *mage = new QImage(rgb,640,480,QImage::Format_RGB888); if (take == 1) { mage->save(tr("%1.jpg").arg("/mnt/Photo/Photo_2019.04.15/IMG" + QDate::currentDate().toString("yyyyMMdd") + QTime::currentTime().toString("hhmmss")),"JPG"); // mage->save(tr("%1.jpg").arg("/home/root/Photo/IMG" + QDate::currentDate().toString("yyyyMMdd") + QTime::currentTime().toString("hhmmss")),"JPG"); take = 0; } QImage resultimg=mage->scaled(ui->label->size(),Qt::KeepAspectRatio,Qt::SmoothTransformation); ui->label->setPixmap(QPixmap::fromImage(resultimg)); delete mage; delete rgb; } void camera::take_photo() { take = 1; } void camera::on_comboBox_activated(const QString &arg1) { QString text=ui->comboBox->currentText(); QByteArray devtext=text.toLatin1(); char *devname=devtext.data(); int ret; struct v4l2_capability cap; fd = ::open(devname, O_RDWR); if(fd < 0) { perror("open error"); } camera::camera_init(); QTimer *timer; timer=new QTimer(); timer->setInterval(10); connect(timer,SIGNAL(timeout()),this,SLOT(show_())); timer->start(10); camera_flag=1; } void camera::on_pushButton_clicked() { close(); } ``` # camera.h ``` #ifndef CAMERA_H #define CAMERA_H #include <QMainWindow> #include <QTimer> #include <QImage> #include <QPixmap> #include <QDebug> #include <QStringList> #include <QByteArray> #include <QComboBox> extern "C"{ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/mman.h> #include <sys/types.h> #include <fcntl.h> #include <sys/ioctl.h> #include <string.h> #include <time.h> #include <sys/select.h> #include <sys/time.h> #include <sys/types.h> #include <unistd.h> #include <jpeglib.h> #include <linux/videodev2.h> } namespace Ui { class camera; } struct bufinfor{ void *start; unsigned int length; }; class camera : public QMainWindow { Q_OBJECT public: explicit camera(QWidget *parent = 0); ~camera(); protected: void moveEvent(QMoveEvent *); void resizeEvent(QResizeEvent *); private slots: int camera_init(void); void on_pushButton_2_clicked(); void show_(); void take_photo(); void on_comboBox_activated(const QString &arg1); void on_pushButton_clicked(); private: Ui::camera *ui; int fd; int camera_flag; struct bufinfor *bufinf; }; #endif // CAMERA_H ``` usbcamera.pro ``` #------------------------------------------------- # # Project created by QtCreator 2019-08-02T09:08:26 # #------------------------------------------------- QT += core gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets TARGET = usbcamera TEMPLATE = app LIBS += -L. -ljpeg SOURCES += main.cpp\ camera.cpp HEADERS += camera.h FORMS += camera.ui ``` 程序界面如下   求助大神该怎么保存拍摄的视频 非常感谢

linux下使用Qt进行视频采集与录制问题_course

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