Hi Laurent, On Fri, Sep 02, 2016 at 12:40:18AM +0300, Laurent Pinchart wrote: ... > > >> +Data Format Negotiation > > >> +======================= > > >> + > > >> +The metadata device uses the :ref:`format` ioctls to select the capture > > >> format. +The metadata buffer content format is bound to that selected > > >> format. In addition +to the basic :ref:`format` ioctls, the > > >> > > >> :ref:`VIDIOC_ENUM_FMT` ioctl must be +supported as well. > > >> > > >> + > > >> +To use the :ref:`format` ioctls applications set the ``type`` of the > > >> +:ref:`v4l2_format <v4l2-format>` structure to > > >> ``V4L2_BUF_TYPE_META_CAPTURE`` +and use the :ref:`v4l2_meta_format > > >> <v4l2-meta-format>` ``meta`` member of the +``fmt`` union as needed per > > >> the desired operation. The :ref:`v4l2-meta-format` +structure contains > > >> two fields, ``dataformat`` is set by applications to the V4L2 > > > > > > I might not specify the number of number of fields here. It has high > > > chances of not getting updated when more fields are added. Up to you. > > > > This has been copied from dev-sdr.rst. I can drop the last sentence > > completely as the parameters are described in the table below. Hans, any > > opinion ? > > How about this ? > > To use the :ref:`format` ioctls applications set the ``type`` of the s/of/field of/ ? > :ref:`v4l2_format <v4l2-format>` structure to ``V4L2_BUF_TYPE_META_CAPTURE`` > and use the :ref:`v4l2_meta_format <v4l2-meta-format>` ``meta`` member of the > ``fmt`` union as needed per the desired operation. Both drivers and > applications must set the remainder of the :ref:`v4l2_format <v4l2-format>` > structure to 0. -- Sakari Ailus e-mail: sakari.ailus@xxxxxx XMPP: sailus@xxxxxxxxxxxxxx
