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