[Bug 790940] v4l2src not falling back to another io-mode if driver does not support dmabuf

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790940

--- Comment #4 from Florent Thiéry <florent.thiery at ubicast.eu> ---
I checked, and even though the ENOTTY is properly returned, the return value is
still TRUE.

static gboolean
gst_v4l2_object_is_dmabuf_supported (GstV4l2Object * v4l2object)
{
  gboolean ret = TRUE;
  struct v4l2_exportbuffer expbuf = {
    .type = v4l2object->type,
    .index = -1,
    .plane = -1,
    .flags = O_CLOEXEC | O_RDWR,
  };

  /* Expected to fail, but ENOTTY tells us that it is not implemented. */
  v4l2object->ioctl (v4l2object->video_fd, VIDIOC_EXPBUF, &expbuf);
  if (errno == -ENOTTY)
    ret = FALSE;
    GST_DEBUG_OBJECT (v4l2object->element, "dmabuf not supported");

  GST_DEBUG ("ret: %d", ret);
  return ret;
}


0:00:00.063954056 16815 0x5583aafec770 DEBUG                   v4l2
gstv4l2object.c:2870:gst_v4l2_object_is_dmabuf_supported:<v4l2src0> dmabuf not
supported
0:00:00.063956958 16815 0x5583aafec770 DEBUG                   v4l2
gstv4l2object.c:2872:gst_v4l2_object_is_dmabuf_supported: ret: 1

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