With this option the device is not opened until at least one stream,
snapshot or sink client appears, and it's closed again 3 seconds after
the last one disconnects. While the device is closed, the clients get
the usual blank screen.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
_jpeg_write_scanlines_yuv_planar() advanced chroma1_data/chroma2_data
after building the current luma row instead of before, so every even
luma row (>=2) read the previous chroma-row-pair's samples instead of
its own. Move the existing advance check to the top of the loop body,
before the row is built, so it takes effect before the chroma pointers
are read for that row. Condition and stride math are unchanged.
HDMI input over CSI2 on RPi5 requires quite a bit more setup, because
/dev/video0 (or other /dev/video*) isn't automatically routed to the
video source. This needs finding relevant source media entity, and then
a route to requested video device (usually /dev/video0). Setting video
format gets more complicated too, because it needs to be set on all
involved nodes (aka "pads").
V4L2_EVENT_SOURCE_CHANGE is delivered on a different FD than reading
stream from, so both needs to be select()ed in this case.
From the user perspective, this adds two new options: --media-device and
--media-entity-name. When provided, ustreamer will find requested entity
and route it to the device given in --device option.
Will be used in the next patch.
I didn't found matching entries for V4L2_PIX_FMT_MJPEG, and
V4L2_PIX_FMT_YVU420 in linux/media-bus-format.h, so those are left as 0
(guaranteed invalid).
