# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild from pkg_resources import parse_version from .kaitaistruct import __version__ as ks_version, KaitaiStruct, KaitaiStream, BytesIO import collections from enum import Enum if parse_version(ks_version) < parse_version('0.7'): raise Exception("Incompatible Kaitai Struct Python API: 0.7 or later is required, but you have %s" % (ks_version)) from .vlq_base128_be import VlqBase128Be class StandardMidiFile(KaitaiStruct): """Standard MIDI file, typically knows just as "MID", is a standard way to serialize series of MIDI events, which is a protocol used in many music synthesizers to transfer music data: notes being played, effects being applied, etc. Internally, file consists of a header and series of tracks, every track listing MIDI events with certain header designating time these events are happening. NOTE: Rarely, MIDI files employ certain stateful compression scheme to avoid storing certain elements of further elements, instead reusing them from events which happened earlier in the stream. Kaitai Struct (as of v0.9) is currently unable to parse these, but files employing this mechanism are relatively rare. """ SEQ_FIELDS = ["hdr", "tracks"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['hdr']['start'] = self._io.pos() self.hdr = self._root.Header(self._io, self, self._root) self.hdr._read() self._debug['hdr']['end'] = self._io.pos() self._debug['tracks']['start'] = self._io.pos() self.tracks = [None] * (self.hdr.num_tracks) for i in range(self.hdr.num_tracks): if not 'arr' in self._debug['tracks']: self._debug['tracks']['arr'] = [] self._debug['tracks']['arr'].append({'start': self._io.pos()}) _t_tracks = self._root.Track(self._io, self, self._root) _t_tracks._read() self.tracks[i] = _t_tracks self._debug['tracks']['arr'][i]['end'] = self._io.pos() self._debug['tracks']['end'] = self._io.pos() class TrackEvents(KaitaiStruct): SEQ_FIELDS = ["event"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['event']['start'] = self._io.pos() self.event = [] i = 0 while not self._io.is_eof(): if not 'arr' in self._debug['event']: self._debug['event']['arr'] = [] self._debug['event']['arr'].append({'start': self._io.pos()}) _t_event = self._root.TrackEvent(self._io, self, self._root) _t_event._read() self.event.append(_t_event) self._debug['event']['arr'][len(self.event) - 1]['end'] = self._io.pos() i += 1 self._debug['event']['end'] = self._io.pos() class TrackEvent(KaitaiStruct): SEQ_FIELDS = ["v_time", "event_header", "meta_event_body", "sysex_body", "event_body"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['v_time']['start'] = self._io.pos() self.v_time = VlqBase128Be(self._io) self.v_time._read() self._debug['v_time']['end'] = self._io.pos() self._debug['event_header']['start'] = self._io.pos() self.event_header = self._io.read_u1() self._debug['event_header']['end'] = self._io.pos() if self.event_header == 255: self._debug['meta_event_body']['start'] = self._io.pos() self.meta_event_body = self._root.MetaEventBody(self._io, self, self._root) self.meta_event_body._read() self._debug['meta_event_body']['end'] = self._io.pos() if self.event_header == 240: self._debug['sysex_body']['start'] = self._io.pos() self.sysex_body = self._root.SysexEventBody(self._io, self, self._root) self.sysex_body._read() self._debug['sysex_body']['end'] = self._io.pos() self._debug['event_body']['start'] = self._io.pos() _on = self.event_type if _on == 224: self.event_body = self._root.PitchBendEvent(self._io, self, self._root) self.event_body._read() elif _on == 144: self.event_body = self._root.NoteOnEvent(self._io, self, self._root) self.event_body._read() elif _on == 208: self.event_body = self._root.ChannelPressureEvent(self._io, self, self._root) self.event_body._read() elif _on == 192: self.event_body = self._root.ProgramChangeEvent(self._io, self, self._root) self.event_body._read() elif _on == 160: self.event_body = self._root.PolyphonicPressureEvent(self._io, self, self._root) self.event_body._read() elif _on == 176: self.event_body = self._root.ControllerEvent(self._io, self, self._root) self.event_body._read() elif _on == 128: self.event_body = self._root.NoteOffEvent(self._io, self, self._root) self.event_body._read() self._debug['event_body']['end'] = self._io.pos() @property def event_type(self): if hasattr(self, '_m_event_type'): return self._m_event_type if hasattr(self, '_m_event_type') else None self._m_event_type = (self.event_header & 240) return self._m_event_type if hasattr(self, '_m_event_type') else None @property def channel(self): if hasattr(self, '_m_channel'): return self._m_channel if hasattr(self, '_m_channel') else None if self.event_type != 240: self._m_channel = (self.event_header & 15) return self._m_channel if hasattr(self, '_m_channel') else None class PitchBendEvent(KaitaiStruct): SEQ_FIELDS = ["b1", "b2"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['b1']['start'] = self._io.pos() self.b1 = self._io.read_u1() self._debug['b1']['end'] = self._io.pos() self._debug['b2']['start'] = self._io.pos() self.b2 = self._io.read_u1() self._debug['b2']['end'] = self._io.pos() @property def bend_value(self): if hasattr(self, '_m_bend_value'): return self._m_bend_value if hasattr(self, '_m_bend_value') else None self._m_bend_value = (((self.b2 << 7) + self.b1) - 16384) return self._m_bend_value if hasattr(self, '_m_bend_value') else None @property def adj_bend_value(self): if hasattr(self, '_m_adj_bend_value'): return self._m_adj_bend_value if hasattr(self, '_m_adj_bend_value') else None self._m_adj_bend_value = (self.bend_value - 16384) return self._m_adj_bend_value if hasattr(self, '_m_adj_bend_value') else None class ProgramChangeEvent(KaitaiStruct): SEQ_FIELDS = ["program"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['program']['start'] = self._io.pos() self.program = self._io.read_u1() self._debug['program']['end'] = self._io.pos() class NoteOnEvent(KaitaiStruct): SEQ_FIELDS = ["note", "velocity"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['note']['start'] = self._io.pos() self.note = self._io.read_u1() self._debug['note']['end'] = self._io.pos() self._debug['velocity']['start'] = self._io.pos() self.velocity = self._io.read_u1() self._debug['velocity']['end'] = self._io.pos() class PolyphonicPressureEvent(KaitaiStruct): SEQ_FIELDS = ["note", "pressure"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['note']['start'] = self._io.pos() self.note = self._io.read_u1() self._debug['note']['end'] = self._io.pos() self._debug['pressure']['start'] = self._io.pos() self.pressure = self._io.read_u1() self._debug['pressure']['end'] = self._io.pos() class Track(KaitaiStruct): SEQ_FIELDS = ["magic", "len_events", "events"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['magic']['start'] = self._io.pos() self.magic = self._io.ensure_fixed_contents(b"\x4D\x54\x72\x6B") self._debug['magic']['end'] = self._io.pos() self._debug['len_events']['start'] = self._io.pos() self.len_events = self._io.read_u4be() self._debug['len_events']['end'] = self._io.pos() self._debug['events']['start'] = self._io.pos() self._raw_events = self._io.read_bytes(self.len_events) io = KaitaiStream(BytesIO(self._raw_events)) self.events = self._root.TrackEvents(io, self, self._root) self.events._read() self._debug['events']['end'] = self._io.pos() class MetaEventBody(KaitaiStruct): class MetaTypeEnum(Enum): sequence_number = 0 text_event = 1 copyright = 2 sequence_track_name = 3 instrument_name = 4 lyric_text = 5 marker_text = 6 cue_point = 7 midi_channel_prefix_assignment = 32 end_of_track = 47 tempo = 81 smpte_offset = 84 time_signature = 88 key_signature = 89 sequencer_specific_event = 127 SEQ_FIELDS = ["meta_type", "len", "body"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['meta_type']['start'] = self._io.pos() self.meta_type = KaitaiStream.resolve_enum(self._root.MetaEventBody.MetaTypeEnum, self._io.read_u1()) self._debug['meta_type']['end'] = self._io.pos() self._debug['len']['start'] = self._io.pos() self.len = VlqBase128Be(self._io) self.len._read() self._debug['len']['end'] = self._io.pos() self._debug['body']['start'] = self._io.pos() self.body = self._io.read_bytes(self.len.value) self._debug['body']['end'] = self._io.pos() class ControllerEvent(KaitaiStruct): SEQ_FIELDS = ["controller", "value"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['controller']['start'] = self._io.pos() self.controller = self._io.read_u1() self._debug['controller']['end'] = self._io.pos() self._debug['value']['start'] = self._io.pos() self.value = self._io.read_u1() self._debug['value']['end'] = self._io.pos() class Header(KaitaiStruct): SEQ_FIELDS = ["magic", "len_header", "format", "num_tracks", "division"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['magic']['start'] = self._io.pos() self.magic = self._io.ensure_fixed_contents(b"\x4D\x54\x68\x64") self._debug['magic']['end'] = self._io.pos() self._debug['len_header']['start'] = self._io.pos() self.len_header = self._io.read_u4be() self._debug['len_header']['end'] = self._io.pos() self._debug['format']['start'] = self._io.pos() self.format = self._io.read_u2be() self._debug['format']['end'] = self._io.pos() self._debug['num_tracks']['start'] = self._io.pos() self.num_tracks = self._io.read_u2be() self._debug['num_tracks']['end'] = self._io.pos() self._debug['division']['start'] = self._io.pos() self.division = self._io.read_s2be() self._debug['division']['end'] = self._io.pos() class SysexEventBody(KaitaiStruct): SEQ_FIELDS = ["len", "data"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['len']['start'] = self._io.pos() self.len = VlqBase128Be(self._io) self.len._read() self._debug['len']['end'] = self._io.pos() self._debug['data']['start'] = self._io.pos() self.data = self._io.read_bytes(self.len.value) self._debug['data']['end'] = self._io.pos() class NoteOffEvent(KaitaiStruct): SEQ_FIELDS = ["note", "velocity"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['note']['start'] = self._io.pos() self.note = self._io.read_u1() self._debug['note']['end'] = self._io.pos() self._debug['velocity']['start'] = self._io.pos() self.velocity = self._io.read_u1() self._debug['velocity']['end'] = self._io.pos() class ChannelPressureEvent(KaitaiStruct): SEQ_FIELDS = ["pressure"] def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self._debug = collections.defaultdict(dict) def _read(self): self._debug['pressure']['start'] = self._io.pos() self.pressure = self._io.read_u1() self._debug['pressure']['end'] = self._io.pos()