Zooming with V4L2
Hello,
I am working on a SOC V4L2 video driver, and need to implement zoom functionality.
Quoted 1 line
From application, there are 2 ways to do zooming. The 1st way is to use
cropping and scaling as described in section 1.11.1. The application calls VIDIOC_S_CROP to achieve zoom. The 2nd way is to use V4L2_CID_ZOOM_ABSOLUTE and V4L2_CID_ZOOM_RELATIVE as described by Laurent in
http://video4linux-list.1448896.n2.nabble.com/RFC-Zoom-controls-in-V4L2-td14
51987.html.
Our camera hardware supports digital zoom. However, it acts LIKE optical zoom because it doesn't do upscaling, so no video quality is sacrificed. As a driver writter, is it okay to support only V4L2_CID_ZOOM_ABSOLUTE and V4L2_CID_ZOOM_RELATIVE?
I guess it also depends on how zooming is done for most of the V4L2 user application out there.
Your comments are appreciated.
-Shuzhen