[Bug 755937] v4l2object: probe colorspace supported by device

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755937

--- Comment #1 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
Created attachment 312475
  --> https://bugzilla.gnome.org/attachment.cgi?id=312475&action=edit
v4l2object: probe all colorspace supported by device

Proposed patch to fix the issue.

It currently probe all the colorspace, so it slightly delay the v4l2
initialization: on my board (Cortex-A9), gst_v4l2_object_add_colorspace now
takes around 13 ms instead of 50 us without probing.

However, I think there is some rooms for improvements and in the future, we may
discuss with V4L2 maintainers to see if the V4L2 api could have a way to
enumerate colorspace like in ENUM_FMT or with other ioctl.

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