v4l2 very simple example [closed]

南楼画角 提交于 2019-11-28 22:01:47

问题


I'm looking for a simple example for camera access in Linux using V4L2. Where I can find it? As simple, as possible.

Thanks,


回答1:


Try the uvccapture code here -> http://staticwave.ca/source/uvccapture/ It is very small yet very concrete example which makes use of all the V4l2 concepts (open,set format, allocate memory, Request Buffer, Dqbuffer and Query-buffer - all intems of ioclts).

uvcgrab() function is the one to look for which makes use of Dqbuffer and Query-buffer.

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 link which will ease your understanding.




回答2:


I would advice also trying out 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.




回答3:


In the API specification, there is an example, also downloadable as a C file



来源:https://stackoverflow.com/questions/4009439/v4l2-very-simple-example

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