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287 lines
9.1 KiB
Python
287 lines
9.1 KiB
Python
15 years ago
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# -*- coding: ISO-8859-1 -*-
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# std library
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from struct import unpack
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# custom
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from DataTypeConverters import readBew, readVar, varLen, toBytes
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# uhh I don't really like this, but there are so many constants to
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# import otherwise
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from constants import *
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class EventDispatcher:
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def __init__(self, outstream):
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"""
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The event dispatcher generates events on the outstream.
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"""
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# internal values, don't mess with 'em directly
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self.outstream = outstream
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# public flags
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# A note_on with a velocity of 0x00 is actually the same as a
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# note_off with a velocity of 0x40. When
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# "convert_zero_velocity" is set, the zero velocity note_on's
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# automatically gets converted into note_off's. This is a less
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# suprising behaviour for those that are not into the intimate
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# details of the midi spec.
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self.convert_zero_velocity = 1
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# If dispatch_continuos_controllers is true, continuos
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# controllers gets dispatched to their defined handlers. Else
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# they just trigger the "continuous_controller" event handler.
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self.dispatch_continuos_controllers = 1 # NOT IMPLEMENTED YET
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# If dispatch_meta_events is true, meta events get's dispatched
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# to their defined events. Else they all they trigger the
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# "meta_event" handler.
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self.dispatch_meta_events = 1
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def header(self, format, nTracks, division):
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"Triggers the header event"
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self.outstream.header(format, nTracks, division)
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def start_of_track(self, current_track):
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"Triggers the start of track event"
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# I do this twice so that users can overwrite the
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# start_of_track event handler without worrying whether the
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# track number is updated correctly.
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self.outstream.set_current_track(current_track)
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self.outstream.start_of_track(current_track)
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def sysex_event(self, data):
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"Dispatcher for sysex events"
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self.outstream.sysex_event(data)
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def eof(self):
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"End of file!"
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self.outstream.eof()
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def update_time(self, new_time=0, relative=1):
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"Updates relative/absolute time."
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self.outstream.update_time(new_time, relative)
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def reset_time(self):
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"Updates relative/absolute time."
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self.outstream.reset_time()
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# Event dispatchers for similar types of events
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def channel_messages(self, hi_nible, channel, data):
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"Dispatches channel messages"
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stream = self.outstream
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data = toBytes(data)
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if (NOTE_ON & 0xF0) == hi_nible:
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note, velocity = data
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# note_on with velocity 0x00 are same as note
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# off with velocity 0x40 according to spec!
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if velocity==0 and self.convert_zero_velocity:
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stream.note_off(channel, note, 0x40)
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else:
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stream.note_on(channel, note, velocity)
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elif (NOTE_OFF & 0xF0) == hi_nible:
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note, velocity = data
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stream.note_off(channel, note, velocity)
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elif (AFTERTOUCH & 0xF0) == hi_nible:
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note, velocity = data
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stream.aftertouch(channel, note, velocity)
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elif (CONTINUOUS_CONTROLLER & 0xF0) == hi_nible:
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controller, value = data
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# A lot of the cc's are defined, so we trigger those directly
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if self.dispatch_continuos_controllers:
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self.continuous_controllers(channel, controller, value)
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else:
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stream.continuous_controller(channel, controller, value)
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elif (PATCH_CHANGE & 0xF0) == hi_nible:
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program = data[0]
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stream.patch_change(channel, program)
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elif (CHANNEL_PRESSURE & 0xF0) == hi_nible:
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pressure = data[0]
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stream.channel_pressure(channel, pressure)
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elif (PITCH_BEND & 0xF0) == hi_nible:
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hibyte, lobyte = data
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value = (hibyte<<7) + lobyte
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stream.pitch_bend(channel, value)
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else:
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raise ValueError, 'Illegal channel message!'
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def continuous_controllers(self, channel, controller, value):
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"Dispatches channel messages"
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stream = self.outstream
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# I am not really shure if I ought to dispatch continuous controllers
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# There's so many of them that it can clutter up the OutStream
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# classes.
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# So I just trigger the default event handler
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stream.continuous_controller(channel, controller, value)
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def system_commons(self, common_type, common_data):
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"Dispatches system common messages"
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stream = self.outstream
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# MTC Midi time code Quarter value
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if common_type == MTC:
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data = readBew(common_data)
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msg_type = (data & 0x07) >> 4
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values = (data & 0x0F)
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stream.midi_time_code(msg_type, values)
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elif common_type == SONG_POSITION_POINTER:
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hibyte, lobyte = toBytes(common_data)
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value = (hibyte<<7) + lobyte
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stream.song_position_pointer(value)
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elif common_type == SONG_SELECT:
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data = readBew(common_data)
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stream.song_select(data)
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elif common_type == TUNING_REQUEST:
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# no data then
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stream.tuning_request(time=None)
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def meta_event(self, meta_type, data):
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"Dispatches meta events"
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stream = self.outstream
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# SEQUENCE_NUMBER = 0x00 (00 02 ss ss (seq-number))
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if meta_type == SEQUENCE_NUMBER:
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number = readBew(data)
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stream.sequence_number(number)
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# TEXT = 0x01 (01 len text...)
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elif meta_type == TEXT:
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stream.text(data)
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# COPYRIGHT = 0x02 (02 len text...)
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elif meta_type == COPYRIGHT:
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stream.copyright(data)
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# SEQUENCE_NAME = 0x03 (03 len text...)
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elif meta_type == SEQUENCE_NAME:
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stream.sequence_name(data)
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# INSTRUMENT_NAME = 0x04 (04 len text...)
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elif meta_type == INSTRUMENT_NAME:
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stream.instrument_name(data)
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# LYRIC = 0x05 (05 len text...)
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elif meta_type == LYRIC:
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stream.lyric(data)
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# MARKER = 0x06 (06 len text...)
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elif meta_type == MARKER:
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stream.marker(data)
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# CUEPOINT = 0x07 (07 len text...)
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elif meta_type == CUEPOINT:
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stream.cuepoint(data)
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# PROGRAM_NAME = 0x08 (05 len text...)
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elif meta_type == PROGRAM_NAME:
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stream.program_name(data)
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# DEVICE_NAME = 0x09 (09 len text...)
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elif meta_type == DEVICE_NAME:
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stream.device_name(data)
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# MIDI_CH_PREFIX = 0x20 (20 01 channel)
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elif meta_type == MIDI_CH_PREFIX:
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channel = readBew(data)
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stream.midi_ch_prefix(channel)
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# MIDI_PORT = 0x21 (21 01 port (legacy stuff))
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elif meta_type == MIDI_PORT:
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port = readBew(data)
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stream.midi_port(port)
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# END_OFF_TRACK = 0x2F (2F 00)
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elif meta_type == END_OF_TRACK:
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stream.end_of_track()
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# TEMPO = 0x51 (51 03 tt tt tt (tempo in us/quarternote))
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elif meta_type == TEMPO:
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b1, b2, b3 = toBytes(data)
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# uses 3 bytes to represent time between quarter
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# notes in microseconds
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stream.tempo((b1<<16) + (b2<<8) + b3)
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# SMTP_OFFSET = 0x54 (54 05 hh mm ss ff xx)
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elif meta_type == SMTP_OFFSET:
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hour, minute, second, frame, framePart = toBytes(data)
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stream.smtp_offset(
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hour, minute, second, frame, framePart)
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# TIME_SIGNATURE = 0x58 (58 04 nn dd cc bb)
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elif meta_type == TIME_SIGNATURE:
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nn, dd, cc, bb = toBytes(data)
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stream.time_signature(nn, dd, cc, bb)
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# KEY_SIGNATURE = 0x59 (59 02 sf mi)
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elif meta_type == KEY_SIGNATURE:
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sf, mi = toBytes(data)
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stream.key_signature(sf, mi)
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# SPECIFIC = 0x7F (Sequencer specific event)
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elif meta_type == SPECIFIC:
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meta_data = toBytes(data)
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stream.sequencer_specific(meta_data)
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# Handles any undefined meta events
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else: # undefined meta type
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meta_data = toBytes(data)
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stream.meta_event(meta_type, meta_data)
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if __name__ == '__main__':
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from MidiToText import MidiToText
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outstream = MidiToText()
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dispatcher = EventDispatcher(outstream)
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dispatcher.channel_messages(NOTE_ON, 0x00, '\x40\x40')
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