scamp.playback_implementations.OSCPlaybackImplementation

class scamp.playback_implementations.OSCPlaybackImplementation(*args, **kwargs)

Bases: scamp.playback_implementations.PlaybackImplementation

Playback implementation that sends outgoing OSC messages to an external synthesizer / program

Parameters

• host_instrument – The ScampInstrument that will use this playback implementation for playback. When this PlaybackImplementation is constructed, it is automatically added to the list of PlaybackImplementations that the host instrument uses.

• port – OSC port to use for playback

• ip_address – ip_address to send OSC messages to

• message_prefix – prefix used in the address of all messages sent. Defaults to the name of the instrument

• osc_message_addresses – dictionary mapping the kind of the message to the address for that message. Defaults to playback_settings.osc_message_addresses

Methods

change_note_parameter(note_id, …)	Method that implements the change of a parameter other than pitch or volume
change_note_pitch(note_id, new_pitch)	Method that implements the change of a note’s pitch
change_note_volume(note_id, new_volume)	Method that implements the change of a note’s volume
end_note(note_id)	Method that implements the end of a note
set_max_pitch_bend(semitones)	This method does nothing in the case of an OSC-based implementation
start_note(note_id, pitch, volume, properties)	Method that implements the start of a note

Inherited Methods

duplicate()	Returns a copy of this object by serializing to and from JSON.
get_shared_resource(key)	Gets the shared resource for this type of playback implementation under the given key.
has_shared_resource(key)	Checks whether there is a shared resource for this type of playback implementation under the given key.
json_dumps()	Dump this object as a JSON string.
json_loads(s)	Load this object from a JSON string.
load_from_json(file_path)	Load this object from a JSON file with the given path.
save_to_json(file_path)	Save this object to a JSON file using the given path.
set_host_instrument(host_instrument)	Sets the host instrument for this PlaybackImplementation.
set_shared_resource(key, value)	Sets a shared resource for this type of playback implementation under the given key.

Attributes

resource_dictionary

Dictionary of shared resources for this type of playback implementation.

start_note(note_id: int, pitch: float, volume: float, properties: dict, other_parameter_values: dict = None) → None

Method that implements the start of a note

Parameters

• note_id – unique identifier for the note we are starting

• pitch – floating-point MIDI pitch value

• volume – floating-point volume value (from 0 to 1)

• properties – a NotePropertiesDictionary

• other_parameter_values – dictionary mapping parameter name to parameter value for parameters other than pitch and volume. (This information was extracted from the properties dictionary.)

end_note(note_id: int) → None

Method that implements the end of a note

Parameters

note_id – unique identifier of the note to end

change_note_pitch(note_id: int, new_pitch: float) → None

Method that implements the change of a note’s pitch

Parameters

• note_id – unique identifier of the note whose pitch to change

• new_pitch – new (floating-point) MIDI pitch value

change_note_volume(note_id: int, new_volume: float) → None

Method that implements the change of a note’s volume

Parameters

• note_id – unique identifier of the note whose volume to change

• new_volume – new floating point volume value from 0 to 1

change_note_parameter(note_id: int, parameter_name: str, new_value: float) → None

Method that implements the change of a parameter other than pitch or volume

Parameters

• note_id – unique identifier of the note to effect

• parameter_name – name of the parameter to change

• new_value – new floating-point value of that parameter

set_max_pitch_bend(semitones: int) → None

This method does nothing in the case of an OSC-based implementation

duplicate() → T

Returns a copy of this object by serializing to and from JSON.

get_shared_resource(key)

Gets the shared resource for this type of playback implementation under the given key.

Parameters

key – key name for this resource

has_shared_resource(key) → bool

Checks whether there is a shared resource for this type of playback implementation under the given key.

Parameters

key – key name for this resource

json_dumps() → str

Dump this object as a JSON string. This uses a custom encoder that recognizes and appropriately converts any attributes that are object inheriting from SavesToJSON.

classmethod json_loads(s: str) → T

Load this object from a JSON string. This uses a custom decoder that looks for a “_type” key in any object/dictionary being parsed and converts it to the class specified (assuming it a subclass of SavesToJSON).

Parameters

s – a string representing this object in JSON format

classmethod load_from_json(file_path: str) → T

Load this object from a JSON file with the given path. This uses a custom decoder that looks for a “_type” key in any object/dictionary being parsed and converts it to the class specified (assuming it a subclass of SavesToJSON).

Parameters

file_path – path for loading the file

property resource_dictionary

Dictionary of shared resources for this type of playback implementation. For instance, SoundfontPlaybackImplementation uses this to store an instance of SoundfontHost. Only one instance of fluidsynth (and therefore SoundfontHost) needs to be running for all instruments in the ensemble, so this is a way of pooling that resource.

save_to_json(file_path: str) → None

Save this object to a JSON file using the given path. This uses a custom encoder that recognizes and appropriately converts any attributes that are object inheriting from SavesToJSON.

Parameters

file_path – path for saving the file

set_host_instrument(host_instrument: scamp.instruments.ScampInstrument)

Sets the host instrument for this PlaybackImplementation. Ordinarily, the host instrument is supplied as an argument to the __init__ method, which then automatically calls this method. However, it is also possible to pass the value None to the host instrument argument initially and later set it with this method.

Parameters

host_instrument – The ScampInstrument that will use this playback implementation for playback. This PlaybackImplementation will be added to the host instrument’s playback_implementations attribute.

set_shared_resource(key, value)

Sets a shared resource for this type of playback implementation under the given key.

Parameters

• key – key name for this resource

• value – value to set for that key