[Bug 768195] v4l2: Add support for device capability

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768195

--- Comment #9 from Luis de Bethencourt <luis at debethencourt.com> ---
Created attachment 331105
  --> https://bugzilla.gnome.org/attachment.cgi?id=331105&action=edit
Fix capture of multiplanar devices

This can be tested by doing:
$ sudo modprobe vivid node_types=0x101 output_types=0x1 input_types=0x3
num_inputs=1 num_outputs=1 multiplanar=2
$ gst-launch-1.0 v4l2src device=/dev/video2 io-mode=dmabuf ! fakesink

Before the patch:
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Failed to
enumerate possible video formats device '/dev/video2' can work with

After the patch:
Playback \o/


This happened because in
sys/v4l2/gstv4l2object.c:gst_v4l2_object_fill_format_list():
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {

Would send the wrong format, and the vivid driver would return ENOTTY since you
can't do VIDIO_ENUM_FMT with single-planer on a multiplanar device, or
viceversa.

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