aiosc 0.1.6

Minimalistic Open Sound Control (OSC) communication module using asyncio

aiosc is a minimalistic Open Sound Control (OSC) communication module which uses asyncio for network operations and is compatible with the asyncio event loop.

Installation

aiosc requires at least Python 3.7. It can be installed using pip:

pip3 install aiosc

Alternatively, use --user option to install aiosc only for the current user:

pip3 install --user aiosc

Usage

To send OSC messages with aiosc, create an asyncio datagram connection endpoint using aiosc.OSCProtocol as the protocol factory.

A datagram connection can be created with the create_datagram_endpoint method of the asyncio event loop. Use the argument remote_addr to specify the OSC server address and port as follows:

import asyncio
import aiosc

async def main():
    loop = asyncio.get_running_loop()

    transport, osc = await loop.create_datagram_endpoint(aiosc.OSCProtocol,
        remote_addr=('127.0.0.1', 8000))

    osc.send('/hello/world')
    osc.send('/a/b/cde', 1000, -1, 'hello', 1.234, 5.678)

asyncio.run(main())

For an OSC server implementation, aiosc.OSCProtocol can be subclassed or directly constructed with a dictionary which maps OSC address patterns to handler methods for incoming messages.

When creating datagram connection for an OSC server with create_datagram_endpoint, use the argument local_addr to specify the interface (address) and listening port for the server.

In a typical case, local address can look like ('0.0.0.0', 9000) where 9000 is the port number and 0.0.0.0 address designates that the server will be listening on all available network interfaces.

import asyncio
import aiosc
import sys

class EchoServer(aiosc.OSCProtocol):
    def __init__(self):
        super().__init__(handlers={
            '/sys/exit': lambda addr, path, *args: sys.exit(0),
            '//*': self.echo,
        })

    def echo(self, addr, path, *args):
        print("incoming message from {}: {} {}".format(addr, path, args))

async def main():
    loop = asyncio.get_running_loop()

    transport, osc = await loop.create_datagram_endpoint(EchoServer,
        local_addr=('0.0.0.0', 8000))

    await loop.create_future()

asyncio.run(main())

For more examples, see examples/.

OSC address patterns

aiosc dispatches messages to handler methods using glob-style address pattern matching as described in the OSC 1.0 specification. The // operator from OSC 1.1 preliminary specification is also supported.

Examples:

• /hello/world matches /hello/world.

• /hello/* matches /hello/world and /hello/sarah.

• /{hello,goodbye}//world matches /hello/world and /goodbye/cruel/world.

• //* matches any address.

Notes

Bundles are not yet supported.

OSC data types are picked from the preliminary spec documented in Features and Future of Open Sound Control version 1.1 for NIME paper. For example, I typetag is decoded to Impulse (aka “bang”) which is passed around as aiosc.Impulse singleton.

Suggestions, bug reports, issues and/or pull requests are, of course, welcome.

License

Copyright (c) 2014 Artem Popov <[e-mail]>

aiosc is licensed under the MIT license, please see LICENSE file for details.