Pypianoroll Classes

We provide several classes for working with multitrack piano rolls.

• pypianoroll.Multitrack: A multitrack that stores track(s) along with global information.

• pypianoroll.Track: A track that stores the a piano roll along with track information.

• pypianoroll.StandardTrack: A standard track that holds a piano roll with velocity information.

• pypianoroll.BinaryTrack: A binary track that holds a piano roll without velocity information.

Multitrack Class

Attribute	Description	Type	Default
name	Name of the multitrack	str
resolution	Time steps per quarter note	int	pypianoroll.DEFAULT_RESOLUTION
tempo	Tempo at each time step	NumPy array of dtype float
downbeat	Downbeat positions	NumPy array of dtype bool
tracks	Music tracks	list of pypianoroll.Track	[]

Track Class

Attribute	Description	Type	Default
name	Name of the track	str
program	MIDI program number	int	pypianoroll.DEFAULT_PROGRAM
is_drum	If it is a drum track	bool	pypianoroll.DEFAULT_IS_DRUM
pianoroll	Downbeat positions	NumPy array	np.zeros((0, 128))

For pypianoroll.StandardTrack, the piano roll array must be of data type uint8 and take values in [0, 127]. For pypianoroll.BinaryTrack, the piano roll array must be of data type bool.