jack-server 0.2.0

Control JACK server with Python

Control JACK audio server with Python. Can be used as replacement for jackd for more robust configuration, for example, when using jack package.

Installation

pip install jack_server

Also you need to have jackserver library on your machine, it comes with JACK2. I had problems with apt-package on Ubuntu (jackd2), if you do too, compile jack yourself.

Usage

🎛 jack_server.Server

On server creation you can specify some parameters:

import jack_server

server = jack_server.Server(
    name="myfancyserver",
    sync=True,
    realtime=False,
    driver="coreaudio",
    device="BuiltInSpeakerDevice",
    rate=48000,
    period=1024,
    # nperiods=2  # Work only with `alsa` driver
)
server.start()

input()

They are actually an equivalent of jackd flags:

• -n, --name to name,
• -S, --sync to sync,
• -R, --realtime, -r, --no-realtime to realtime,
• -d to driver,

And driver arguments:

• -d, --device to device,
• -r, --rate to rate,
• -p, --period to period,

start(self) -> None

Open and start the server. All state controlling methods are idempotent.

stop(self) -> None

Stop and close server.

driver: jack_server.Driver

Selected driver.

name: str

Actual server name. It is property that calls C code, so you can actually set the name.

sync: bool

Whether JACK runs in sync mode. Useful when you`re trying to send and receive multichannel audio.

realtime: bool

Whether JACK should start in realtime mode.

params: dict[str, jack_server.Parameter]

Server parameters mapped by name.

💼 jack_server.Driver

Driver (JACK backend), can be safely changed before server is started. Not supposed to be created by user code.

name: str

Driver name, read-only.

device: str

Selected device.

rate: jack_server.SampleRate

Sampling rate.

period: int

Buffer size.

nperiods: int

Number of periods. 2 is right for motherboard, PCI, PCI-X, etc.; 3 for USB (source).

Can be helpful when tailoring performance on jittery systems.

params: dict[str, jack_server.Parameter]

Driver parameters mapped by name.

📻 jack_server.SampleRate

Valid sampling rate, 44100 or 48000.

🔻 jack_server.Parameter

Not supposed to be created by user code.

name: str

Read-only verbose name of parameter.

value: int | str | bytes | bool

Value of the parameter, can be changed.

❗️ jack_server.set_info_function(callback: Callable[[str], None] | None) -> None

Set info output handler. By default JACK does is itself, i. e. output is being printed in stdout.

‼️ jack_server.set_error_function(callback: Callable[[str], None] | None) -> None

Set error output handler. By default JACK does is itself, i. e. output is being printed in stderr.