def system_commons(self, common_type, common_data):
"Dispatches system common messages"
stream = self.outstream
# MTC Midi time code Quarter value
if common_type == MTC:
data = readBew(common_data)
msg_type = (data & 0x07) >> 4
values = (data & 0x0F)
stream.midi_time_code(msg_type, values)
elif common_type == SONG_POSITION_POINTER:
hibyte, lobyte = toBytes(common_data)
value = (hibyte<<7) + lobyte
stream.song_position_pointer(value)
elif common_type == SONG_SELECT:
data = readBew(common_data)
stream.song_select(data)
elif common_type == TUNING_REQUEST:
# no data then
stream.tuning_request(time=None)
def readBew(self, n_bytes=1, move_cursor=1):
"""
Reads n bytes of date from the current cursor position.
Moves cursor if move_cursor is true
"""
return readBew(self.nextSlice(n_bytes, move_cursor))
def meta_event(self, meta_type, data):
"Dispatches meta events"
stream = self.outstream
# SEQUENCE_NUMBER = 0x00 (00 02 ss ss (seq-number))
if meta_type == SEQUENCE_NUMBER:
number = readBew(data)
stream.sequence_number(number)
# TEXT = 0x01 (01 len text...)
elif meta_type == TEXT:
stream.text(data)
# COPYRIGHT = 0x02 (02 len text...)
elif meta_type == COPYRIGHT:
stream.copyright(data)
# SEQUENCE_NAME = 0x03 (03 len text...)
elif meta_type == SEQUENCE_NAME:
stream.sequence_name(data)
# INSTRUMENT_NAME = 0x04 (04 len text...)
elif meta_type == INSTRUMENT_NAME:
stream.instrument_name(data)
# LYRIC = 0x05 (05 len text...)
elif meta_type == LYRIC:
stream.lyric(data)
# MARKER = 0x06 (06 len text...)
elif meta_type == MARKER:
stream.marker(data)
# CUEPOINT = 0x07 (07 len text...)
elif meta_type == CUEPOINT:
stream.cuepoint(data)
# PROGRAM_NAME = 0x08 (05 len text...)
elif meta_type == PROGRAM_NAME:
stream.program_name(data)
# DEVICE_NAME = 0x09 (09 len text...)
elif meta_type == DEVICE_NAME:
stream.device_name(data)
# MIDI_CH_PREFIX = 0x20 (20 01 channel)
elif meta_type == MIDI_CH_PREFIX:
channel = readBew(data)
stream.midi_ch_prefix(channel)
# MIDI_PORT = 0x21 (21 01 port (legacy stuff))
elif meta_type == MIDI_PORT:
port = readBew(data)
stream.midi_port(port)
# END_OFF_TRACK = 0x2F (2F 00)
elif meta_type == END_OF_TRACK:
stream.end_of_track()
# TEMPO = 0x51 (51 03 tt tt tt (tempo in us/quarternote))
elif meta_type == TEMPO:
b1, b2, b3 = toBytes(data)
# uses 3 bytes to represent time between quarter
# notes in microseconds
stream.tempo((b1<<16) + (b2<<8) + b3)
# SMTP_OFFSET = 0x54 (54 05 hh mm ss ff xx)
elif meta_type == SMTP_OFFSET:
hour, minute, second, frame, framePart = toBytes(data)
stream.smtp_offset(
hour, minute, second, frame, framePart)
# TIME_SIGNATURE = 0x58 (58 04 nn dd cc bb)
elif meta_type == TIME_SIGNATURE:
nn, dd, cc, bb = toBytes(data)
stream.time_signature(nn, dd, cc, bb)
# KEY_SIGNATURE = 0x59 (59 02 sf mi)
elif meta_type == KEY_SIGNATURE:
sf, mi = toBytes(data)
stream.key_signature(sf, mi)
# SPECIFIC = 0x7F (Sequencer specific event)
elif meta_type == SPECIFIC:
meta_data = toBytes(data)
stream.sequencer_specific(meta_data)
# Handles any undefined meta events
else: # undefined meta type
meta_data = toBytes(data)
stream.meta_event(meta_type, meta_data)
