Add GStreamer plugin and element skeleton

This implements the GStreamer plugin interface and adds libcamerasrc
element feature to it. This is just enough to allow plugin
introspection.

gst-inspect-1.0 build/src/gstreamer/libgstlibcamera.so
Plugin Details:
  Name                     libcamera
  Description              libcamera capture plugin
  Filename                 build/src/gstreamer/libgstlibcamera.so
  Version                  0.0.0+1042-6c9f16d3-dirty
  License                  LGPL
  Source module            libcamera
  Binary package           libcamera
  Origin URL               https://libcamera.org

  libcamerasrc: libcamera Source

  1 features:

GST_PLUGIN_PATH=$(pwd)/build/src/gstreamer gst-inspect-1.0 libcamerasrc
Factory Details:
  Rank                     primary (256)
  Long-name                libcamera Source
  Klass                    Source/Video
  Description              Linux Camera source using libcamera
  Author                   Nicolas Dufresne <nicolas.dufresne@collabora.com

Plugin Details:
  Name                     libcamera
  Description              libcamera capture plugin
  Filename                 /home/nicolas/Sources/libcamera/build/src/gstreamer/libgstlibcamera.so
  Version                  0.0.0+1042-6c9f16d3-dirty
  License                  LGPL
  Source module            libcamera
  Binary package           libcamera
  Origin URL               https://libcamera.org

GObject
 +----GInitiallyUnowned
       +----GstObject
             +----GstElement
                   +----GstLibcameraSrc

Pad Templates:
  none

Element has no clocking capabilities.
Element has no URI handling capabilities.

Pads:
  none

Element Properties:
  name                : The name of the object
                        flags: accès en lecture, accès en écriture, 0x2000
                        String. Default: "libcamerasrc0"
  parent              : The parent of the object
                        flags: accès en lecture, accès en écriture, 0x2000
                        Object of type "GstObject"

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
[Silence -Wunused-function warning for older GLib versions]
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/meson.build b/src/meson.build
index 5adcd61f..d818d8b8 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -10,3 +10,5 @@ subdir('qcam')
 if get_option('v4l2')
     subdir('v4l2')
 endif
+
+subdir('gstreamer')