Re: About s_stream in v4l2-subdev

["Dongsoo, Nathaniel Kim" <dongsoo.kim@gmail.com>]

Thank you Hans,
Regards,

Nate

On Fri, May 29, 2009 at 6:21 AM, Hans Verkuil <hverkuil@xs4all.nl> wrote:
> On Thursday 28 May 2009 13:20:15 Dongsoo, Nathaniel Kim wrote:
>> Hello everyone,
>>
>> I'm doing my driver job with kernel 2.6.30-rc6, trying to figure out
>> how to convert my old drivers to v4l2-subdev framework. Looking into
>> the v4l2-subdev.h file an interesting API popped up and can't find any
>> precise comment about that. It is "s_stream" in v4l2_subdev_video_ops.
>> I think I found this api in the very nick of time, if the purpose of
>> that api  is exactly what I need. Actually, I was trying to make my
>> sub device to get streamon and streamoff command from the device side,
>> and I wish the "s_stream" is that for. Because in case of camera
>> module with embedded JPEG encoder, it is necessary to make the camera
>> module be aware of the exact moment of streamon to pass the encoded
>> data to camera interface. (many of camera ISPs can't stream out
>> continuous frame of JPEG data, so we have only one chance  of shot).
>> Is the s_stream for streamon purpose in subdev? (I hope so...finger
>> crossed) Cheers,
>
> Yes it is. It is for subdevs that need to implement VIDIOC_STREAMON and
> VIDIOC_STREAMOFF.
>
> Regards,
>
>        Hans
>
>
> --
> Hans Verkuil - video4linux developer - sponsored by TANDBERG Telecom
>



-- 
=
DongSoo, Nathaniel Kim
Engineer
Mobile S/W Platform Lab.
Digital Media & Communications R&D Centre
Samsung Electronics CO., LTD.
e-mail : dongsoo.kim@gmail.com
          dongsoo45.kim@samsung.com