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#!/usr/bin/env ruby
# Actual video and depth capture work similarly to eachother.
# But they're still both pretty un-sugary.
#
# Future versions will probably abstract this and try to make it more
# ruby-ish.
#
# The example below shows how to capture a single video frame to a PPM file.
$: << File.expand_path(File.join(File.dirname(__FILE__), "../lib"))
require 'freenect'
ctx = Freenect.init()
devs = ctx.num_devices
STDERR.puts "Number of Kinects detected: #{devs}"
unless devs > 0
STDERR.puts "Error: no kinect detected"
exit 1
end
STDERR.puts "Selecting device 0"
dev = ctx.open_device(0)
dev.led = :green # play with the led
dev.video_mode = Freenect.video_mode(:medium, :rgb)
dev.start_video()
# Or to grab depth:
# dev.depth_mode = Freenect.depth_mode(:medium, :depth_11bit)
# dev.start_depth()
$snapshot_finished = nil
STDERR.puts "Attempting snapshot"
dev.set_video_callback do |device, video, timestamp|
if not $snapshot_finished
fname = "%i.ppm" % timestamp
STDERR.puts "Writing #{fname}"
File.open(fname, "w") do |f|
f.puts("P6 %d %d 255\n" % [ dev.video_mode.width, dev.video_mode.height ] )
f.write(video.read_string_length(dev.video_mode.bytes))
end
$snapshot_finished = true
end
end
ret = -1
until $snapshot_finished
break if (ret=ctx.process_events) < 0
end
if ret < 0
STDERR.puts "Error: unable to take snapshot. process_events code=#{ret}"
end
dev.led = :off
dev.stop_video
# Or
# dev.stop_depth
dev.close
ctx.close
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