;(load (sb-ext:posix-getenv "ASDF"))
(asdf:load-system 'cl-gobject-introspection)

(defpackage :gstreamer-simple-pipeline
  (:use :cl)
  (:export cast-with-videobox))

(in-package :gstreamer-simple-pipeline)

;; name wildly from
;; https://stackoverflow.com/questions/36296165/python-bindings-for-gstreamer-how-to-import-typelib
(defvar *gstreamer* (gir:require-namespace "Gst"))

;; let's generalize, when stream is not passed, use the testsrc
(defun cast-with-videobox (&optional stream-num)
  (gir:invoke (*gstreamer* 'init) '())
  (let* ((pipeline (gir:invoke (*gstreamer* "Pipeline" 'new) "video-pipeline"))
         (source (gir:invoke (*gstreamer* "ElementFactory" 'make) (if stream-num
																							"pipewiresrc"
																							"videotestsrc") "source"))
         (convert (gir:invoke (*gstreamer* "ElementFactory" 'make) "videoconvert" "convert"))
         (box (gir:invoke (*gstreamer* "ElementFactory" 'make) "videobox" "box"))
         (sink (gir:invoke (*gstreamer* "ElementFactory" 'make) "autovideosink" "sink")))
	 (when stream-num
		;; Set pipewiresrc properties, such as the path
		(setf (gir:property source 'path) (format nil "~A" stream-num)))

	 ;; Add and link elements in the pipeline
    (gir:invoke (pipeline 'add) source)
    (gir:invoke (pipeline 'add) convert)
    (gir:invoke (pipeline 'add) box)
    (gir:invoke (pipeline 'add) sink)
    
    (gir:invoke (source 'link) convert)
    (gir:invoke (convert 'link) box)
    (gir:invoke (box 'link) sink)

	 (gir:invoke (pipeline 'set-state) (gir:nget *gstreamer* "State" :playing))
	 ;(format t ">> arhg ~A" (gir:property box 'top))
	 (defun move-video (top left)
		(setf (gir:property box 'top) top
				(gir:property box 'left) left))

    ;; Example: Move the video 10 pixels down and 20 pixels to the right
    (move-video 100 200)
	 pipeline))
;; now this works, but padding is symmetrical