可以帮我写一个L2级别辅助驾驶的软件框架吗
时间: 2023-03-27 20:04:35 浏览: 55
我可以为您提供一些关于L2级别辅助驾驶软件框架的建议和指导,但具体的实现需要根据您的需求和技术能力来进行。L2级别辅助驾驶需要实现的功能包括车道保持、自适应巡航、自动泊车等,需要使用传感器、控制算法、人机交互界面等技术来实现。您可以参考一些已有的开源项目或者商业产品来进行学习和借鉴。
相关问题
你可以帮我写个v4l2框架的camera取流代码
当然可以,以下是一个简单的v4l2框架的camera取流代码示例:
```c++
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/videodev2.h>
#define BUFFER_COUNT 4
struct buffer {
void *start;
size_t length;
};
int main(int argc, char **argv) {
int fd;
struct v4l2_capability cap;
struct v4l2_format fmt;
struct v4l2_requestbuffers req;
struct v4l2_buffer buf;
enum v4l2_buf_type type;
struct buffer buffers[BUFFER_COUNT];
unsigned int i, n;
fd_set fds;
struct timeval tv;
int r;
fd = open("/dev/video0", O_RDWR);
if (fd < 0) {
perror("open");
return 1;
}
if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
perror("VIDIOC_QUERYCAP");
return 1;
}
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
fprintf(stderr, "The device does not support video capture.\n");
return 1;
}
if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
fprintf(stderr, "The device does not support streaming I/O.\n");
return 1;
}
memset(&fmt, 0, sizeof(fmt));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = 640;
fmt.fmt.pix.height = 480;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
if (ioctl(fd, VIDIOC_S_FMT, &fmt) < 0) {
perror("VIDIOC_S_FMT");
return 1;
}
memset(&req, 0, sizeof(req));
req.count = BUFFER_COUNT;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
if (ioctl(fd, VIDIOC_REQBUFS, &req) < 0) {
perror("VIDIOC_REQBUFS");
return 1;
}
for (i = 0; i < req.count; i++) {
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
if (ioctl(fd, VIDIOC_QUERYBUF, &buf) < 0) {
perror("VIDIOC_QUERYBUF");
return 1;
}
buffers[i].length = buf.length;
buffers[i].start = mmap(NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, buf.m.offset);
if (buffers[i].start == MAP_FAILED) {
perror("mmap");
return 1;
}
}
for (i = 0; i < req.count; i++) {
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
if (ioctl(fd, VIDIOC_QBUF, &buf) < 0) {
perror("VIDIOC_QBUF");
return 1;
}
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(fd, VIDIOC_STREAMON, &type) < 0) {
perror("VIDIOC_STREAMON");
return 1;
}
for (n = 0; n < 100; n++) {
FD_ZERO(&fds);
FD_SET(fd, &fds);
tv.tv_sec = 2;
tv.tv_usec = 0;
r = select(fd + 1, &fds, NULL, NULL, &tv);
if (r < 0) {
perror("select");
return 1;
}
if (r == 0) {
fprintf(stderr, "select timeout\n");
return 1;
}
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
if (ioctl(fd, VIDIOC_DQBUF, &buf) < 0) {
perror("VIDIOC_DQBUF");
return 1;
}
printf("frame %u: %p\n", n, buffers[buf.index].start);
if (ioctl(fd, VIDIOC_QBUF, &buf) < 0) {
perror("VIDIOC_QBUF");
return 1;
}
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(fd, VIDIOC_STREAMOFF, &type) < 0) {
perror("VIDIOC_STREAMOFF");
return 1;
}
for (i = 0; i < req.count; i++) {
if (munmap(buffers[i].start, buffers[i].length) < 0) {
perror("munmap");
return 1;
}
}
close(fd);
return 0;
}
```
这段代码使用了v4l2框架来获取摄像头的视频流数据。它首先通过ioctl函数查询设备的能力,然后设置视频格式和请求缓冲区。接着,它使用mmap函数将缓冲区映射到用户空间,然后将缓冲区加入到队列中。最后,它使用select函数等待摄像头的数据,并将数据从队列中取出,处理完后再将缓冲区重新加入队列。
帮我写一个v4l2程序采用userptr的方式
好的,这是一个简单的采用userptr方式的v4l2程序示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/videodev2.h>
#define WIDTH 640
#define HEIGHT 480
#define BUFFER_COUNT 4
struct buffer {
void *start;
size_t length;
};
int main(int argc, char **argv)
{
int fd;
struct v4l2_capability cap;
struct v4l2_format fmt;
struct v4l2_requestbuffers req;
struct buffer buffers[BUFFER_COUNT];
enum v4l2_buf_type type;
int i, j;
/* 打开设备 */
fd = open("/dev/video0", O_RDWR);
if (fd == -1) {
perror("open");
exit(EXIT_FAILURE);
}
/* 查询设备信息 */
if (ioctl(fd, VIDIOC_QUERYCAP, &cap) == -1) {
perror("ioctl(VIDIOC_QUERYCAP)");
exit(EXIT_FAILURE);
}
/* 查询支持的格式 */
memset(&fmt, 0, sizeof(fmt));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(fd, VIDIOC_G_FMT, &fmt) == -1) {
perror("ioctl(VIDIOC_G_FMT)");
exit(EXIT_FAILURE);
}
/* 设置格式 */
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = WIDTH;
fmt.fmt.pix.height = HEIGHT;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
if (ioctl(fd, VIDIOC_S_FMT, &fmt) == -1) {
perror("ioctl(VIDIOC_S_FMT)");
exit(EXIT_FAILURE);
}
/* 请求缓冲区 */
memset(&req, 0, sizeof(req));
req.count = BUFFER_COUNT;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_USERPTR;
if (ioctl(fd, VIDIOC_REQBUFS, &req) == -1) {
perror("ioctl(VIDIOC_REQBUFS)");
exit(EXIT_FAILURE);
}
/* 映射缓冲区 */
for (i = 0; i < BUFFER_COUNT; i++) {
buffers[i].length = WIDTH * HEIGHT * 2;
buffers[i].start = mmap(NULL, buffers[i].length, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
if (buffers[i].start == MAP_FAILED) {
perror("mmap");
exit(EXIT_FAILURE);
}
}
/* 将缓冲区加入采集队列 */
for (i = 0; i < BUFFER_COUNT; i++) {
struct v4l2_buffer buf;
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_USERPTR;
buf.index = i;
buf.m.userptr = (unsigned long)buffers[i].start;
buf.length = buffers[i].length;
if (ioctl(fd, VIDIOC_QBUF, &buf) == -1) {
perror("ioctl(VIDIOC_QBUF)");
exit(EXIT_FAILURE);
}
}
/* 开始采集 */
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(fd, VIDIOC_STREAMON, &type) == -1) {
perror("ioctl(VIDIOC_STREAMON)");
exit(EXIT_FAILURE);
}
/* 采集图像 */
for (i = 0; i < 10; i++) {
fd_set fds;
struct timeval tv;
int r;
FD_ZERO(&fds);
FD_SET(fd, &fds);
tv.tv_sec = 2;
tv.tv_usec = 0;
r = select(fd + 1, &fds, NULL, NULL, &tv);
if (r == -1) {
perror("select");
exit(EXIT_FAILURE);
}
if (r == 0) {
fprintf(stderr, "select timeout\n");
exit(EXIT_FAILURE);
}
/* 取出采集到的图像 */
for (j = 0; j < BUFFER_COUNT; j++) {
struct v4l2_buffer buf;
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_USERPTR;
buf.index = j;
if (ioctl(fd, VIDIOC_DQBUF, &buf) == -1) {
perror("ioctl(VIDIOC_DQBUF)");
exit(EXIT_FAILURE);
}
printf("frame %d, buffer %d\n", i, j);
/* 处理图像 */
// TODO: 在这里处理图像数据
/* 将缓冲区重新加入采集队列 */
if (ioctl(fd, VIDIOC_QBUF, &buf) == -1) {
perror("ioctl(VIDIOC_QBUF)");
exit(EXIT_FAILURE);
}
}
}
/* 停止采集 */
if (ioctl(fd, VIDIOC_STREAMOFF, &type) == -1) {
perror("ioctl(VIDIOC_STREAMOFF)");
exit(EXIT_FAILURE);
}
/* 释放缓冲区 */
for (i = 0; i < BUFFER_COUNT; i++) {
if (munmap(buffers[i].start, buffers[i].length) == -1) {
perror("munmap");
exit(EXIT_FAILURE);
}
}
/* 关闭设备 */
if (close(fd) == -1) {
perror("close");
exit(EXIT_FAILURE);
}
return 0;
}
```
在该示例程序中,我们使用了`VIDIOC_REQBUFS`命令和`V4L2_MEMORY_USERPTR`内存类型来请求采集缓冲区,并使用`mmap`函数将缓冲区映射到用户空间。在采集图像时,我们使用`VIDIOC_DQBUF`命令将采集到的图像数据从缓冲区中取出,并在处理完数据后重新将缓冲区加入采集队列。