78 lines
3.1 KiB
Common Lisp
78 lines
3.1 KiB
Common Lisp
;(load (sb-ext:posix-getenv "ASDF"))
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(asdf:load-system 'cl-cffi-gtk)
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(asdf:load-system 'cl-gobject-introspection)
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(defpackage :capturing-frames
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(:use :cl))
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(in-package :capturing-frames)
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(gir:require-namespace "GLib")
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(defvar *gstreamer* (gir:require-namespace "Gst"))
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(defun cast-with-videobox (&optional stream-num)
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(gir:invoke (*gstreamer* 'init) '())
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(let* ((pipeline (gir:invoke (*gstreamer* "Pipeline" 'new) "video-pipeline"))
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(source (gir:invoke (*gstreamer* "ElementFactory" 'make) (if stream-num
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"pipewiresrc"
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"videotestsrc") "source"))
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(convert (gir:invoke (*gstreamer* "ElementFactory" 'make) "videoconvert" "convert"))
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(tee (gir:invoke (*gstreamer* "ElementFactory" 'make) "tee" "tee"))
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(queue1 (gir:invoke (*gstreamer* "ElementFactory" 'make) "queue" "queue1"))
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(queue2 (gir:invoke (*gstreamer* "ElementFactory" 'make) "queue" "queue2"))
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(sink (gir:invoke (*gstreamer* "ElementFactory" 'make) "autovideosink" "sink"))
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(appsink (gir:invoke (*gstreamer* "ElementFactory" 'make) "appsink" "appsink")))
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(when stream-num
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;; Set pipewiresrc properties, such as the path
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(setf (gir:property source 'path) (format nil "~A" stream-num)))
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;; Add and link elements in the pipeline
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(gir:invoke (pipeline 'add) source)
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(gir:invoke (pipeline 'add) convert)
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(gir:invoke (pipeline 'add) tee)
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(gir:invoke (pipeline 'add) queue1)
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(gir:invoke (pipeline 'add) queue2)
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(gir:invoke (pipeline 'add) sink)
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(gir:invoke (pipeline 'add) appsink)
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(gir:invoke (source 'link) convert)
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(gir:invoke (convert 'link) tee)
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(gir:invoke (tee 'link) queue1)
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(gir:invoke (tee 'link) queue2)
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(gir:invoke (queue1 'link) sink)
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(gir:invoke (queue2 'link) appsink)
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;; Configure appsink
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(setf (gir:property appsink "emit-signals") t
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(gir:property appsink "max-buffers") 1
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(gir:property appsink "drop") t)
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(gir:invoke (pipeline 'set-state) (gir:nget *gstreamer* "State" :playing))
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;; Example: Move the video 10 pixels down and 20 pixels to the right
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pipeline))
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(defun process-frame (sample)
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(let* ((buffer (gir:invoke (sample 'get-buffer)))
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(info (gir:invoke (buffer 'get-memory) 0))
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(map-info (gir:invoke (info 'map) (gir:nget *gstreamer* "MapFlags" :read)))
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(data (gir:property map-info 'data))
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(size (gir:property map-info 'size)))
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;; Process the frame data here
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(format t "Received frame of size ~A bytes~%" size)
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;; Example: Calculate average brightness
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(let ((sum 0))
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(dotimes (i size)
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(incf sum (aref data i)))
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(format t "Average brightness: ~A~%" (/ sum size)))
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;; Unmap the memory when done
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(gir:invoke (info 'unmap) map-info)))
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(defun start-processing (appsink)
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(gir:connect appsink "new-sample"
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(lambda (appsink)
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(let ((sample (gir:invoke (appsink 'pull-sample))))
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(when sample
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(process-frame sample)
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(gir:invoke (sample 'unref))))
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(gir:nget *gstreamer* "FlowReturn" :ok))))
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