Module: Rtmidi::Message

Defined in:
lib/rtmidi/message.rb

Defined Under Namespace

Classes: ActiveSensing, ChannelAftertouch, Continue, ControlChange, NoteOff, NoteOn, PitchBend, PolyAftertouch, ProgramChange, SongPositionPointer, SongSelect, Start, Stop, SysEx, SystemReset, TimeCodeQuarterFrame, TimingClock, TuneRequest, Unknown

Class Method Summary collapse

Class Method Details

.parse(message) ⇒ Object 



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# File 'lib/rtmidi/message.rb', line 26

def parse(message)
  bytes = normalize_bytes(message, allow_empty: false)
  status = bytes[0]

  return parse_system_message(status, bytes) if status >= 0xF0

  parse_channel_message(status, bytes)
end

.serialize(message) ⇒ Object 



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# File 'lib/rtmidi/message.rb', line 35

def serialize(message)
  case message
  when Array
    normalize_bytes(message, allow_empty: false)
  when NoteOff
    [status_byte(0x80, message.channel), data_byte(message.note, "note"), data_byte(message.velocity, "velocity")]
  when NoteOn
    [status_byte(0x90, message.channel), data_byte(message.note, "note"), data_byte(message.velocity, "velocity")]
  when PolyAftertouch
    [status_byte(0xA0, message.channel), data_byte(message.note, "note"), data_byte(message.pressure, "pressure")]
  when ControlChange
    [status_byte(0xB0, message.channel), data_byte(message.controller, "controller"), data_byte(message.value, "value")]
  when ProgramChange
    [status_byte(0xC0, message.channel), data_byte(message.program, "program")]
  when ChannelAftertouch
    [status_byte(0xD0, message.channel), data_byte(message.pressure, "pressure")]
  when PitchBend
    bend = integer_in_range(message.value, 0, 16_383, "value")
    [status_byte(0xE0, message.channel), bend & 0x7F, (bend >> 7) & 0x7F]
  when SysEx
    serialize_sysex(message.data)
  when TimeCodeQuarterFrame
    message_type = integer_in_range(message.message_type, 0, 7, "message_type")
    value = integer_in_range(message.value, 0, 15, "value")
    [0xF1, (message_type << 4) | value]
  when SongPositionPointer
    position = integer_in_range(message.position, 0, 16_383, "position")
    [0xF2, position & 0x7F, (position >> 7) & 0x7F]
  when SongSelect
    [0xF3, data_byte(message.song, "song")]
  when TuneRequest
    [0xF6]
  when TimingClock
    [0xF8]
  when Start
    [0xFA]
  when Continue
    [0xFB]
  when Stop
    [0xFC]
  when ActiveSensing
    [0xFE]
  when SystemReset
    [0xFF]
  when Unknown
    normalize_bytes(message.bytes, allow_empty: false)
  else
    raise ArgumentError, "unsupported MIDI message: #{message.inspect}"
  end
end