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| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2010-03-16 02:26:04 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-03-22 10:53:31 +0300 |
| commit | 333c8b97785d5afd5085ba3720b4d259623290f6 (patch) | |
| tree | 3cba92af1765957c68f74042dea1873481554ede /Documentation/DocBook/v4l/v4l2.xml | |
| parent | d3a7ed99759b18e4fd19b8ddd226f8085b8bd975 (diff) | |
| download | linux-333c8b97785d5afd5085ba3720b4d259623290f6.tar.xz | |
[media] v4l: v4l2_subdev userspace format API
Add a userspace API to get, set and enumerate the media format on a
subdev pad.
The format at the output of a subdev usually depends on the format at
its input(s). The try format operation is thus not suitable for probing
format at individual pads, as it can't modify the device state and thus
can't remember the format tried at the input to compute the output
format.
To fix the problem, pass an extra argument to the get/set format
operations to select the 'try' or 'active' format.
The try format is used when probing the subdev. Setting the try format
must not change the device configuration but can store data for later
reuse. Data storage is provided at the file-handle level so applications
probing the subdev concurently won't interfere with each other.
The active format is used when configuring the subdev. It's identical to
the format handled by the usual get/set operations.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook/v4l/v4l2.xml')
| -rw-r--r-- | Documentation/DocBook/v4l/v4l2.xml | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/DocBook/v4l/v4l2.xml b/Documentation/DocBook/v4l/v4l2.xml index 7859d7d9da39..2ada2f86bb54 100644 --- a/Documentation/DocBook/v4l/v4l2.xml +++ b/Documentation/DocBook/v4l/v4l2.xml @@ -439,6 +439,7 @@ and discussions on the V4L mailing list.</revremark> <section id="radio"> &sub-dev-radio; </section> <section id="rds"> &sub-dev-rds; </section> <section id="event"> &sub-dev-event; </section> + <section id="subdev"> &sub-dev-subdev; </section> </chapter> <chapter id="driver"> @@ -506,6 +507,9 @@ and discussions on the V4L mailing list.</revremark> &sub-reqbufs; &sub-s-hw-freq-seek; &sub-streamon; + &sub-subdev-enum-frame-size; + &sub-subdev-enum-mbus-code; + &sub-subdev-g-fmt; &sub-subscribe-event; <!-- End of ioctls. --> &sub-mmap; |