v4l2object: Disable DMABuf for emulated formats
libv4l2 does not prevent exporting DMABuf even when emulated formats are
in use. As a side effect, userspace ends up with buffers of the original
formats which will cause issues.
https://bugzilla.gnome.org/show_bug.cgi?id=795097
diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
index 678f035..f0f8d0b 100644
--- a/sys/v4l2/gstv4l2object.c
+++ b/sys/v4l2/gstv4l2object.c
@@ -2878,6 +2878,12 @@
.flags = O_CLOEXEC | O_RDWR,
};
+ if (v4l2object->fmtdesc->flags & V4L2_FMT_FLAG_EMULATED) {
+ GST_WARNING_OBJECT (v4l2object->dbg_obj,
+ "libv4l2 converter detected, disabling DMABuf");
+ ret = FALSE;
+ }
+
/* Expected to fail, but ENOTTY tells us that it is not implemented. */
v4l2object->ioctl (v4l2object->video_fd, VIDIOC_EXPBUF, &expbuf);
if (errno == ENOTTY)
