[Bug 733501] New: v4l2: Fully support v4l2_plane.data_offset
GStreamer (bugzilla.gnome.org)
bugzilla at gnome.org
Mon Jul 21 05:57:30 PDT 2014
https://bugzilla.gnome.org/show_bug.cgi?id=733501
GStreamer | gst-plugins-good | git
Summary: v4l2: Fully support v4l2_plane.data_offset
Classification: Platform
Product: GStreamer
Version: git
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: gst-plugins-good
AssignedTo: gstreamer-bugs at lists.freedesktop.org
ReportedBy: nicolas.dufresne at collabora.co.uk
QAContact: gstreamer-bugs at lists.freedesktop.org
GNOME version: ---
This parameter is not well documented in V4L2 hence was not fully implemented.
It's mostly implemented for DMABUF, but ignored for MMAP.
<hverkuil> 08:06:12> stormer: please don't ignore data_offset. You can test
with this driver:
http://git.linuxtv.org/cgit.cgi/hverkuil/media_tree.git/log/?h=vivid
<hverkuil> 08:06:23> modprobe vivid multiplanar=2
<hverkuil> 08:06:41> Select the NV16 pixformat and plane 0 will have a
data_offset of 128.
<hverkuil> 08:07:00> for both input (video0) and output (video1).
<hverkuil> 08:07:52> remember: bytesused *includes* data_offset, so the actual
size of the image is bytesused-data_offset.
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