Module meter 

Time signatures: bar length, beat count, beat length and beat division. Time signatures, ported from music21’s meter package.

TimeSignature covers the part of music21’s meter handling that is a pure function of the numerator and denominator: how long a bar is, how many beats it carries, how long each beat is, and how that beat subdivides.

music21 derives all of this from a MeterSequence partition tree, and so does this: a meter carries the four sequences music21 hangs off one — the display, the beats, the beams and the accents — and answers from them. TimeSignature::beams_for beams a run of notes against the beam sequence, and the weights come off the accent sequence, so a caller who sets them reads their own back. The partition rule is music21’s _setDefaultBeatPartitions, verified against upstream by the meter_parity fixture.

Re-exports

pub use sequence::MeterTerminal;

pub use sequence::OffsetAlign;

Modules

sequence

How a bar divides: music21’s MeterTerminal and MeterSequence.

Structs

BeamedNote

One of a run of notes to be beamed: where it sits in the bar, how long it lasts, what it is written as, and whether it sounds.

TimeSignature

A time signature, such as 4/4 or 6/8.

Enums

BeatDivision

How the beat of a meter subdivides.

Functions

best_time_signature

The time signature that fits what a measure holds: music21’s bestTimeSignature.

snapped_fraction

A fractional beat read as the fraction it suggests: music21’s addFloatPrecision, which snaps a third, two thirds, a sixth or five sixths written as decimals onto the fraction itself.