367 lines
12 KiB
Python
367 lines
12 KiB
Python
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"""
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Meta messages for MIDI files.
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TODO:
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- what if an unknown meta message is implemented and someone depends on
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the 'data' attribute?
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- is 'type_byte' a good name?
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- 'values' is not a good name for a dictionary.
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- type and value safety?
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- copy().
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- expose _key_signature_encode/decode?
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"""
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from abc import ABCMeta, abstractmethod
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from collections.abc import Generator, Iterable, Sequence
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from contextlib import contextmanager
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from numbers import Integral
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from typing import ClassVar, Literal, Never, Self, SupportsIndex, override, type_check_only
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from _typeshed import ReadableBuffer
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from ..messages import BaseMessage
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_charset: str = "latin1"
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class KeySignatureError(Exception):
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"""Raised when key cannot be converted from key/mode to key letter"""
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_key_signature_decode: dict[tuple[int, int], str]
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_key_signature_encode: dict[str, tuple[int, int]]
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_smpte_framerate_decode: dict[int, int | float]
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_smpte_framerate_encode: dict[int | float, int]
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type _EncodeTypeNameSigned = Literal["byte", "short", "long"]
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type _EncodeTypeNameUnsigned = Literal["ubyte", "ushort", "ulong"]
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def signed(to_type: _EncodeTypeNameSigned | _EncodeTypeNameUnsigned, n: int) -> int: ...
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def unsigned(to_type: _EncodeTypeNameSigned, n: int) -> int: ...
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def encode_variable_int(value: int) -> list[int]:
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"""Encode variable length integer.
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Returns the integer as a list of bytes,
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where the last byte is < 128.
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This is used for delta times and meta message payload
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length.
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"""
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def decode_variable_int(value: Iterable[int]) -> int:
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"""Decode a list to a variable length integer.
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Does the opposite of `encode_variable_int(value)`
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"""
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def encode_string(string: str) -> list[int]: ...
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def decode_string(data: Iterable[SupportsIndex] | ReadableBuffer) -> str: ...
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@contextmanager
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def meta_charset(tmp_charset: str) -> Generator[None, Never]: ...
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def check_int(value: int | Integral, low: int | Integral, high: int | Integral) -> None: ...
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def check_str(value: str) -> None: ...
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class MetaSpec(metaclass=ABCMeta): # not an ABC in runtime
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type: str
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@type_check_only
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@abstractmethod
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def decode(self, message: MetaMessage, data: Sequence[int]) -> None: ... # not exist in runtime
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@type_check_only
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@abstractmethod
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def encode(self, message: MetaMessage) -> list[int]: ... # not exist in runtime
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def check(self, name: Never, value: Never) -> None: ...
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class MetaSpec_sequence_number(MetaSpec):
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type: str = "sequence_number"
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type_byte: int = 0x00
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attributes: ClassVar[list[str]] = ["number"]
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defaults: ClassVar[list[int]] = [0]
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@override
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def decode(self, message: MetaMessage, data: Sequence[int]) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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@override
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def check(self, name: Never, value: int | Integral) -> None: ...
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class MetaSpec_text(MetaSpec):
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type: str = "text"
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type_byte: int = 0x01
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attributes: ClassVar[list[str]] = ["text"]
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defaults: ClassVar[list[str]] = [""]
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@override
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def decode(self, message: MetaMessage, data: Iterable[SupportsIndex] | ReadableBuffer) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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@override
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def check(self, name: Never, value: str) -> None: ...
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class MetaSpec_copyright(MetaSpec_text):
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type: str = "copyright"
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type_byte: int = 0x02
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class MetaSpec_track_name(MetaSpec_text):
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type: str = "track_name"
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type_byte: int = 0x03
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attributes: ClassVar[list[str]] = ["name"]
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defaults: ClassVar[list[str]] = [""]
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@override
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def decode(self, message: MetaMessage, data: Iterable[SupportsIndex] | ReadableBuffer) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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class MetaSpec_instrument_name(MetaSpec_track_name):
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type: str = "instrument_name"
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type_byte: int = 0x04
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class MetaSpec_lyrics(MetaSpec_text):
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type: str = "lyrics"
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type_byte: int = 0x05
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class MetaSpec_marker(MetaSpec_text):
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type: str = "marker"
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type_byte: int = 0x06
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class MetaSpec_cue_marker(MetaSpec_text):
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type: str = "cue_marker"
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type_byte: int = 0x07
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class MetaSpec_device_name(MetaSpec_track_name):
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type: str = "device_name"
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type_byte: int = 0x09
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class MetaSpec_channel_prefix(MetaSpec):
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type: str = "channel_prefix"
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type_byte: int = 0x20
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attributes: ClassVar[list[str]] = ["channel"]
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defaults: ClassVar[list[int]] = [0]
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@override
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def decode(self, message: MetaMessage, data: Sequence[int]) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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@override
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def check(self, name: Never, value: int) -> None: ...
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class MetaSpec_midi_port(MetaSpec):
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type: str = "midi_port"
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type_byte: int = 0x21
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attributes: ClassVar[list[str]] = ["port"]
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defaults: ClassVar[list[int]] = [0]
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@override
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def decode(self, message: MetaMessage, data: Sequence[int]) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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@override
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def check(self, name: Never, value: int) -> None: ...
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class MetaSpec_end_of_track(MetaSpec):
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type: str = "end_of_track"
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type_byte: int = 0x2F
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attributes: ClassVar[list[Never]] = []
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defaults: ClassVar[list[Never]] = []
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@override
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def decode(self, message: MetaMessage, data: Sequence[int]) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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class MetaSpec_set_tempo(MetaSpec):
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type: str = "set_tempo"
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type_byte: int = 0x51
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attributes: ClassVar[list[str]] = ["tempo"]
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defaults: ClassVar[list[int]] = [500000]
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@override
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def decode(self, message: MetaMessage, data: Sequence[int]) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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@override
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def check(self, name: Never, value: int) -> None: ...
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class MetaSpec_smpte_offset(MetaSpec):
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type: str = "smpte_offset"
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type_byte: int = 0x54
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attributes: ClassVar[list[str]] = ["frame_rate", "hours", "minutes", "seconds", "frames", "sub_frames"]
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# TODO: What are some good defaults?
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defaults: ClassVar[list[int]] = [24, 0, 0, 0, 0, 0]
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@override
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def decode(self, message: MetaMessage, data: Sequence[int]) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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@override
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def check(self, name: str, value: int) -> None: ...
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class MetaSpec_time_signature(MetaSpec):
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type: str = "time_signature"
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type_byte: int = 0x58
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# TODO: these need more sensible names.
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attributes: ClassVar[list[str]] = ["numerator", "denominator", "clocks_per_click", "notated_32nd_notes_per_beat"]
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defaults: ClassVar[list[int]] = [4, 4, 24, 8]
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@override
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def decode(self, message: MetaMessage, data: Sequence[int]) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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@override
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def check(self, name: str, value: int) -> None: ...
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class MetaSpec_key_signature(MetaSpec):
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type: str = "key_signature"
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type_byte: int = 0x59
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attributes: ClassVar[list[str]] = ["key"]
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defaults: ClassVar[list[str]] = ["C"]
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@override
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def decode(self, message: MetaMessage, data: Sequence[int]) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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@override
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def check(self, name: Never, value: str) -> None: ...
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class MetaSpec_sequencer_specific(MetaSpec):
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type: str = "sequencer_specific"
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type_byte: int = 0x7F
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attributes: ClassVar[list[str]] = ["data"]
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defaults: ClassVar[list[Sequence[int]]]
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@override
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def decode(self, message: MetaMessage, data: Iterable[int]) -> None: ...
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@override
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def encode(self, message: MetaMessage) -> list[int]: ...
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def add_meta_spec(klass: type[MetaSpec]) -> None: ...
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_META_SPECS: dict[int | str, type[MetaSpec]]
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_META_SPEC_BY_TYPE: dict[str, type[MetaSpec]]
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def build_meta_message(
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meta_type: int | str, data: Sequence[int], delta: int = 0
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) -> MetaMessage | UnknownMetaMessage: ...
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# NOTE: Generics not supported in runtime
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class _MetaMessage[T: str = str](BaseMessage):
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type: T
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time: int
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@property
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@override
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def is_meta(self) -> Literal[True]: ... # a normal attribute in runtime
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def __init__(self, type: str, skip_checks: bool = False, **kwargs: object) -> None: ...
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@override
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def copy(self, **overrides: object) -> Self:
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"""Return a copy of the message
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Attributes will be overridden by the passed keyword arguments.
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Only message specific attributes can be overridden. The message
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type can not be changed.
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"""
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@override
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def __setattr__(self, name: str, value: object) -> None: ...
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@override
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def bytes(self) -> list[int]: ...
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@classmethod
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def from_bytes(cls, msg_bytes: Sequence[int]) -> MetaMessage | UnknownMetaMessage: ...
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@type_check_only
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class SequenceNumberMetaMessage(_MetaMessage[Literal["sequence_number"]]):
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number: int
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@type_check_only
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class TextMetaMessage(_MetaMessage[Literal["text"]]):
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text: str
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@type_check_only
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class CopyrightMetaMessage(_MetaMessage[Literal["copyright"]]):
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text: str
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@type_check_only
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class TrackNameMetaMessage(_MetaMessage[Literal["track_name"]]):
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name: str
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@type_check_only
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class InstrumentNameMetaMessage(_MetaMessage[Literal["instrument_name"]]):
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name: str
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@type_check_only
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class LyricsMetaMessage(_MetaMessage[Literal["lyrics"]]):
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text: str
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@type_check_only
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class MarkerMetaMessage(_MetaMessage[Literal["marker"]]):
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text: str
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@type_check_only
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class CueMarkerMetaMessage(_MetaMessage[Literal["cue_marker"]]):
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text: str
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@type_check_only
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class DeviceNameMetaMessage(_MetaMessage[Literal["device_name"]]):
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name: str
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@type_check_only
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class ChannelPrefixMetaMessage(_MetaMessage[Literal["channel_prefix"]]):
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channel: int
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@type_check_only
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class MidiPortMetaMessage(_MetaMessage[Literal["midi_port"]]):
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port: int
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@type_check_only
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class EndOfTrackMetaMessage(_MetaMessage[Literal["end_of_track"]]): ...
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@type_check_only
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class SetTempoMetaMessage(_MetaMessage[Literal["set_tempo"]]):
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tempo: int
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@type_check_only
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class SmpteOffsetMetaMessage(_MetaMessage[Literal["smpte_offset"]]):
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frame_rate: int
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hours: int
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minutes: int
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seconds: int
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frames: int
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sub_frames: int
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@type_check_only
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class TimeSignatureMetaMessage(_MetaMessage[Literal["time_signature"]]):
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numerator: int
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denominator: int
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clocks_per_click: int
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notated_32nd_notes_per_beat: int
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@type_check_only
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class KeySignatureMetaMessage(_MetaMessage[Literal["key_signature"]]):
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key: str
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@type_check_only
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class SequencerSpecificMetaMessage(_MetaMessage[Literal["sequencer_specific"]]):
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data: Sequence[int]
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class UnknownMetaMessage(_MetaMessage):
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type_byte: Sequence[int]
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data: tuple[int, ...]
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def __init__(
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self,
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type_byte: Sequence[int],
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data: Sequence[int] | None = ...,
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time: int = 0,
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type: str = "unknown_meta",
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**kwargs: Never,
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) -> None: ...
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@override
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def __setattr__(self, name: str, value: object) -> None: ...
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@override
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def bytes(self) -> list[int]: ...
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# NOTE: `MetaMessage` is a concrete type (actually the `_MetaMessage` in this stub) in runtime
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type MetaMessage = (
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SequenceNumberMetaMessage
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| TextMetaMessage
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| CopyrightMetaMessage
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| TrackNameMetaMessage
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| InstrumentNameMetaMessage
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| LyricsMetaMessage
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| MarkerMetaMessage
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| CueMarkerMetaMessage
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| DeviceNameMetaMessage
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| ChannelPrefixMetaMessage
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| MidiPortMetaMessage
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| EndOfTrackMetaMessage
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| SetTempoMetaMessage
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| SmpteOffsetMetaMessage
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| TimeSignatureMetaMessage
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| KeySignatureMetaMessage
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| SequencerSpecificMetaMessage
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)
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