Hi,
On 08/13/2012 09:15 PM, Sylwester Nawrocki wrote: <snip>
And if a driver also supports single-plane formats in addition to >1 plane formats, should V4L2_CAP_VIDEO_CAPTURE be compulsary?
Yes, so that non multi-plane aware apps keep working.
There is the multi-planar API and there are multi-planar formats. Single- and multi-planar formats can be handled with the multi-planar API. So if a driver supports single- and multi-planar formats by means on multi-planar APIs, there shouldn't be a need for signalling V4L2_CAP_VIDEO_CAPTURE, which normally indicates single-planar API. The driver may choose to not support it, in order to handle single-planar formats. Thus, in my opinion making V4L2_CAP_VIDEO_CAPTURE compulsory wouldn't make sense. Unless the driver supports both types of ioctls (_mplane and regular versions), we shouldn't flag V4L2_CAP_VIDEO_CAPTURE.
Ok.
Regards,
Hans