Class: ATEM::Network

Inherits:
Object
  • Object
show all
Defined in:
lib/atem/network.rb

Defined Under Namespace

Modules: Packet Classes: Retry

Constant Summary collapse

@@SIZE_OF_HEADER = 
0x0c

Instance Method Summary collapse

Constructor Details

#initialize(ip, port, uid = 0x1337) ⇒ Network

Returns a new instance of Network.



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# File 'lib/atem/network.rb', line 32

def initialize ip, port, uid = 0x1337

	@socket = UDPSocket.new
	@socket.bind "0.0.0.0", 9100

	@ip = ip
	@port = port
	@uid = uid
	@package_id = 0

end

Instance Method Details

#<<(data) ⇒ Object 



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# File 'lib/atem/network.rb', line 48

def << data

	bitmask, ack_id, payload = data

	bitmask = bitmask << 11
	bitmask |= (payload.length + @@SIZE_OF_HEADER)
	
	package_id = 0
	if (bitmask & (Packet::HELLO | Packet::ACK)) != 0 and @ready and payload.length != 0
		# p "SENDING PACKAGE"
		@package_id += 1 
		package_id = @package_id
	end

	packet = [bitmask, @uid, ack_id, 0, package_id].pack("S>S>S>L>S>")
	packet += payload

	# print "TX(#{packet.length}, #{@package_id}, #{ack_id})"; p packet.to_hex
	@socket.send packet, 0, @ip, @port

end

#disconnect ⇒ Object 



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# File 'lib/atem/network.rb', line 44

def disconnect
	@socket.close
end

#hello ⇒ Object 



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# File 'lib/atem/network.rb', line 82

def hello

	self << [0x02, 0x0, [0x01000000, 0x00].pack("L>L>")]
	self.receive_until_ready

end

#receive ⇒ Object 



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# File 'lib/atem/network.rb', line 89

def receive

	packets = []
	next_packet = nil

	begin

		begin
			data, _ = @socket.recvfrom(2048)
		rescue
			p "ERR"
			return []
		end

		# print "RX(#{data.length}) "; p data.to_hex

		bitmask, size, uid, ack_id, _, package_id = data.unpack("CXS>S>S>LS>")
		@uid = uid

		bitmask = bitmask >> 3
		size &= 0x07FF

		# print "RX HEADER: "
		# p [bitmask, size, uid, ack_id, package_id]

		@ack_id = package_id

		packet = [ack_id, bitmask, package_id, data[ @@SIZE_OF_HEADER .. -1 ]]

		packets += handle(packet)

#				raise Retry

#			rescue Retry
#				retry if next_packet and next_packet.length >= @@SIZE_OF_HEADER
	end

	packets

end

#receive_until_ready ⇒ Object 



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# File 'lib/atem/network.rb', line 130

def receive_until_ready 

	packets = []
	while !@ready
		packets += receive
	end
	packets

end

#send!(cmd, payload) ⇒ Object 



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# File 'lib/atem/network.rb', line 70

def send! cmd, payload

	raise "Invalid command" if cmd.bytes.length != 4

	size = cmd.length + payload.length + 4
	datagram = [size, 0, 0].pack("S>CC") + cmd + payload

	self << [Packet::ACK_REQ, @ack_id, datagram]
	self.receive 

end