aiosc

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 of type aiosc.OSCProtocol.

A datagram connection can be created with the aiosc.connect convenience function or create_datagram_method of the asyncio event loop. Both have the same set of arguments. Use the argument remote_addr to specify the OSC server address and port as follows:

import asyncio
import aiosc

async def main():
    client = await aiosc.connect(remote_addr=('127.0.0.1', 8000))

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

asyncio.run(main())

Subclassing aiosc.OSCProtocol is the recommended way of creating OSC server implementations.

aiosc.OSCProtocol provides a convenience async class method connect that can be used to bind the UDP socket and connect it to a remote endpoint using local_addr and remote_addr arguments.

In a typical case, local address will 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():
    server = await EchoServer.connect(local_addr=('0.0.0.0', 8000))
    await asyncio.get_running_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