Hello,
this is an updated version of the changeset extending struct v4l2_mbus_framefmt
with new framesamples field.
Changes since v1:
- Docbook documentation improvements
- drivers that are exposing a sub-device node are modified to initialize
the new struct v4l2_mbus_framefmt member to 0 if they support only
uncompressed formats
The proposed semantics for the framesamples parameter is as follows:
- the value is propagated at video pipeline entities where 'code' indicates
compressed format;
- the subdevs adjust the value if needed;
- although currently there is only one compressed data format at the media
bus - V4L2_MBUS_FMT_JPEG_1X8 which corresponds to V4L2_PIX_FMT_JPEG and
one sample at the media bus equals to one byte in memory, it is assumed
that the host knows exactly what is framesamples/sizeimage ratio and it will
validate framesamples/sizeimage values before starting streaming;
- the host will query internally a relevant subdev to properly handle 'sizeimage'
at the VIDIOC_TRY/S_FMT ioctl
And here is a link to my initial RFC:
http://www.mail-archive.com/linux-media@xxxxxxxxxxxxxxx/msg39321.html
--
Regards,
Sylwester Nawrocki
Samsung Poland R&D Center
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