Module: MIDIMessage::SystemExclusive

Defined in:
lib/midi-message/system_exclusive.rb

Overview

MIDI System-Exclusive Messages (SysEx)

Defined Under Namespace

Modules: Base Classes: Command, Message, Node, Request

Class Method Summary collapse

Class Method Details

.new(*bytes) ⇒ Object

convert raw MIDI data to SysEx message objects



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# File 'lib/midi-message/system_exclusive.rb', line 210

def self.new(*bytes)

  start_status = bytes.shift
  end_status = bytes.pop

  return nil unless start_status.eql?(0xF0) && end_status.eql?(0xF7)
  
  type_byte = bytes[3]
  
  # if the 4th byte isn't status, we will just make this a Message object -- this may need some tweaking
  if type_byte == 0x11
    msg_class = Request
  elsif type_byte == 0x12
    msg_class = Command
  else 
    return Message.new(bytes)
  end
  
  fixed_length_message_part = bytes.slice!(0,7)

  manufacturer_id = fixed_length_message_part[0]
  device_id = fixed_length_message_part[1]
  model_id = fixed_length_message_part[2]

  address = fixed_length_message_part.slice(4,3)
  checksum = bytes.slice!((bytes.length - 1), 1)
  value = bytes

  node = Node.new(manufacturer_id, :model_id => model_id, :device_id => device_id)
  msg_class.new(address, value, :checksum => checksum, :node => node)
end