Linux v4l2 非常简单的例子
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v4l2 very simple example
提问by Alex Ivasyuv
I'm looking for a simpleexample for camera access in Linux using V4L2. Where I can find it? As simple, as possible.
我正在寻找一个使用 V4L2 在 Linux 中访问相机的简单示例。我在哪里可以找到它？尽可能简单。
Thanks,
谢谢，
回答by shodanex
回答by Raulp
Try the uvccapture code here -> http://staticwave.ca/source/uvccapture/It is very small yet very concreteexample which makes use of all the V4l2 concepts (open,set format, allocate memory, Request Buffer, Dqbuffer and Query-buffer - all intems of ioclts).
在这里尝试 uvccapture 代码 -> http://staticwave.ca/source/uvccapture/这是一个非常小但非常具体的示例，它利用了所有 V4l2 概念（打开、设置格式、分配内存、请求缓冲区、Dqbuffer 和查询-buffer - ioclt 的所有项目）。
uvcgrab() function is the one to look for which makes use of Dqbuffer and Query-buffer.
uvcgrab() 函数是查找使用Dqbuffer 和Query-buffer 的函数。
ioctl (vd->fd, VIDIOC_DQBUF, &vd->buf);
ioctl (vd->fd, VIDIOC_QBUF, &vd->buf)
While Studying it you can keep looking for the ioctl definition in this linkwhich will ease your understanding.
在学习它时，您可以继续在此链接中查找 ioctl 定义，这将有助于您的理解。
回答by ekmungi
I would advice also trying out v4l-utils.
我建议也尝试 v4l-utils。
http://linuxtv.org/downloads/v4l-utils/
http://linuxtv.org/downloads/v4l-utils/
It has some easy to use API calls to v4l devices and there is a qt based example in the source to build a custom interface for video devices.
它有一些易于使用的对 v4l 设备的 API 调用，并且源中有一个基于 qt 的示例，用于为视频设备构建自定义界面。
