Re: [PATCH 4/8] ispvideo: Add support for G/S/ENUM_STD ioctl
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: 2011-09-16 13:06:16
Also in:
linux-arm-kernel, linux-media, lkml
Hi Deepthy, On Friday 16 September 2011 15:00:53 Ravi, Deepthy wrote:
On Thursday, September 08, 2011 10:51 PM Laurent Pinchart wrote:quoted
On Thursday 08 September 2011 15:35:22 Deepthy Ravi wrote:quoted
From: Vaibhav Hiremath <redacted> In order to support TVP5146 (for that matter any video decoder), it is important to support G/S/ENUM_STD ioctl on /dev/videoX device node.Why so ? Shouldn't it be queried on the subdev output pad directly ?Because standard v4l2 application for analog devices will call these std ioctls on the streaming device node. So it's done on /dev/video to make the existing apllication work.
Existing applications can't work with the OMAP3 ISP (and similar complex embedded devices) without userspace support anyway, either in the form of a GStreamer element or a libv4l plugin. I still believe that analog video standard operations should be added to the subdev pad operations and exposed through subdev device nodes, exactly as done with formats. -- Regards, Laurent Pinchart