On Saturday 12 September 2009 13:05:14 Markus Rechberger wrote:
> Hi,
>
> On Sat, Sep 12, 2009 at 12:57 PM, Hans Verkuil <[email protected]> wrote:
> > Rather than writing long mails on what a media controller is and what it can
> > do, I thought that I could just as well implement it.
> >
> > So in 4 hours I implemented pretty much all of the media controller
> > functionality. The main missing features are the ability to register non-v4l
> > device nodes so that they can be enumerated and setting controls private to
> > a sub-device. For that I should first finish the control handling framework.
> >
> > The datastructures and naming conventions needs to be cleaned up, and it
> > needs some tweaking, but I'd say this is pretty much the way I want it.
> >
> > The code is available here:
> >
> > http://linuxtv.org/hg/~hverkuil/v4l-dvb-mc/
> >
> > It includes a v4l2-mc utility in v4l2-apps/util that has the
> > --show-topology option that enumerates all nodes and subdev. Currently any
> > registered subdevs and v4l device nodes are already automatically added.
> > Obviously, there are no links setup between them, that would require work
> > in the drivers.
> >
> > Total diffstat:
> >
> > b/linux/include/media/v4l2-mc.h | 54 +++++
> > b/v4l2-apps/util/v4l2-mc.cpp | 325
> > ++++++++++++++++++++++++++++++++
> > linux/drivers/media/video/v4l2-dev.c | 15 +
> > linux/drivers/media/video/v4l2-device.c | 265 +++++++++++++++++++++++++-
> > linux/include/linux/videodev2.h | 74 +++++++
> > linux/include/media/v4l2-dev.h | 6
> > linux/include/media/v4l2-device.h | 23 +-
> > linux/include/media/v4l2-subdev.h | 11 -
> > v4l2-apps/util/Makefile | 2
> > 9 files changed, 762 insertions(+), 13 deletions(-)
> >
> > Ignoring the new utility that's just 435 lines of core code.
> >
> > Now try this with sysfs. Brrr.
> >
>
> please even more important when doing this push out a proper
> documentation for it,
> The s2api is a mess seen from the documentation people need to hack
> existing code in order
> to figure out how to use it it seems. v4l2/(incomplete)linuxdvb v3 API
> are still the best references
> to start with right now.
It will obviously be documented extensively when/if this becomes official.
Right now it is an initial implementation people can play with.
Regards,
Hans
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG Telecom
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