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#!/usr/bin/env python3
# SPDX-License-Identifier:Unlicense
# If you have installed aravis in a non standard location, you may need
# to make GI_TYPELIB_PATH point to the correct location. For example:
#
# export GI_TYPELIB_PATH=$GI_TYPELIB_PATH:/opt/bin/lib/girepositry-1.0/
#
# You may also have to give the path to libaravis.so, using LD_PRELOAD or
# LD_LIBRARY_PATH.
#
# As this example alos uses the aravis gstreamer plugin, you may need to tell the path to the plugin using
# GST_PLUGIN_PATH.
# Example of a gstreamer pipeline using a software trigger
#
# Author: WhaSukGO <leeju213@gmail.com>
import gi
import threading
import time
gi.require_version('Gst', '1.0')
from gi.repository import Gst, GLib
# Initialize GStreamer
Gst.init(None)
def main():
# Create GStreamer elements
aravissrc = Gst.ElementFactory.make("aravissrc", "source")
aravissrc.set_property("exposure", 1700)
aravissrc.set_property("do-timestamp", True)
aravissrc.set_property("trigger", "Software")
bayer_caps = Gst.Caps.from_string("video/x-bayer,format=rggb,width=800,height=600")
bayer2rgb = Gst.ElementFactory.make("bayer2rgb", "bayer2rgb")
videoconvert = Gst.ElementFactory.make("videoconvert", "videoconvert")
videosink = Gst.ElementFactory.make("autovideosink", "videosink")
# Create a new pipeline
pipeline = Gst.Pipeline.new("mypipeline")
# Add elements to the pipeline
pipeline.add(aravissrc)
pipeline.add(bayer2rgb)
pipeline.add(videoconvert)
pipeline.add(videosink)
# Link the elements with the capsfilter in between
aravissrc.link_filtered(bayer2rgb, bayer_caps)
bayer2rgb.link(videoconvert)
videoconvert.link(videosink)
# Function to trigger the camera
def trigger_camera():
while True:
time.sleep(0.5) # Sleep for 2 milliseconds (500fps)
aravissrc.emit("software-trigger")
# Create and start the trigger thread
trigger_thread = threading.Thread(target=trigger_camera)
trigger_thread.daemon = True # Daemonize thread so it exits when the main program does
trigger_thread.start()
# Start the pipeline
pipeline.set_state(Gst.State.PLAYING)
# Run the pipeline
loop = GLib.MainLoop()
try:
loop.run()
except KeyboardInterrupt:
pass
# Clean up
pipeline.set_state(Gst.State.NULL)
if __name__ == "__main__":
main()
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