博客
关于我
摄像头驱动程序
阅读量:679 次
发布时间:2019-03-16

本文共 727 字,大约阅读时间需要 2 分钟。

摄像头驱动程序的核心操作流程及实现技术说明

摄像头驱动程序的实现需要遵循Linux视频4总线(V4L)规范,主要包括以下11个ioctl命令的支持及其应用场景:

  • 列.static/获取设备描述: vedioptions_querycap()

  • 获取/设置格式描述: vedioptions_enum_fmt_vid_cap/ vedioptions_g_fmt_vid_cap/ vedioptions_try_fmt_vid_cap/ vedioptions_s_fmt_vid_cap/

  • 缓冲区操作: vedioptions_reqbufs() vedioptions_querybuf() vedioptions_qbuf() vedioptions_dqbuf()

  • 流操作: vedioptions_streamon() vedioptions_streamoff()

  • 数据生产与处理流程: 通过select机制实现实时数据生产与处理

  • 驱动程序的主要实现步骤如下:

  • video_device的分配与配置 通过video_device_alloc()获取video_device实例

  • Fops结构的注册 需要实现video_fops_operations的结构体,包含了所有ioctl命令的处理函数

  • 具体实现步骤说明

  • video_register_device()用于将设备信息注册到系统内

  • videobuf_queue_ops的构造 如果需要使用内核提供的缓冲区操作函数,需要自定义一个videobuf_queue_ops结构体,实现缓冲区的分配、映射、入队和出队等功能

  • 综上,通过以上完整流程和核心实现步骤,可以构建一个完整的摄像头驱动程序框架。

    转载地址:http://ysaqz.baihongyu.com/

    你可能感兴趣的文章
    nnU-Net 终极指南
    查看>>
    No 'Access-Control-Allow-Origin' header is present on the requested resource.
    查看>>
    NO 157 去掉禅道访问地址中的zentao
    查看>>
    no available service ‘default‘ found, please make sure registry config corre seata
    查看>>
    No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
    查看>>
    no connection could be made because the target machine actively refused it.问题解决
    查看>>
    No Datastore Session bound to thread, and configuration does not allow creation of non-transactional
    查看>>
    No fallbackFactory instance of type class com.ruoyi---SpringCloud Alibaba_若依微服务框架改造---工作笔记005
    查看>>
    No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalanc
    查看>>
    No mapping found for HTTP request with URI [/...] in DispatcherServlet with name ...的解决方法
    查看>>
    No mapping found for HTTP request with URI [/logout.do] in DispatcherServlet with name 'springmvc'
    查看>>
    No module named 'crispy_forms'等使用pycharm开发
    查看>>
    No module named cv2
    查看>>
    No module named tensorboard.main在安装tensorboardX的时候遇到的问题
    查看>>
    No module named ‘MySQLdb‘错误解决No module named ‘MySQLdb‘错误解决
    查看>>
    No new migrations found. Your system is up-to-date.
    查看>>
    No qualifying bean of type XXX found for dependency XXX.
    查看>>
    No qualifying bean of type ‘com.netflix.discovery.AbstractDiscoveryClientOptionalArgs<?>‘ available
    查看>>
    No resource identifier found for attribute 'srcCompat' in package的解决办法
    查看>>
    no session found for current thread
    查看>>