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TOPIC: aseqnet trick

aseqnet trick 2 years 2 months ago #8

aseqnet is a very simple ALSA utility. aseqnet is a client/server sequencer which sends/receives events over
network (you need to run ALSA system on both hosts).
You can emulate the ALSA operation mechanism with Windows and Mac in a MIDI virtual loopback interface or in a gateway application. The loopback MIDI Interface would become a aseqnet client (directly or through a gateway).
The network connection between Win/Mac virtual MIDI interface and ALSA is direct. UDP may be used in place of TCP (default aseqnet protocol) and performance could be very satisfactory with a little effort. In practice it would be much more effective than JackAudio network MIDI. In addition, the system becomes easily portable to any platform, even with microcontrollers ...


================================================================
ALSA sequencer connectors over network
ver.0.1
Copyright (C) 1999-2000 Takashi Iwai
================================================================

* ASEQNET

aseqnet is a sequencer client which sends/receives events over
network. Suppose two hosts (hostA and hostB) connected by network.
You need to run ALSA system on both hosts. Then, start aseqnet as a
server on hostA:

hostA% aseqnet
sequencer opened: 128:0

A user client 128 with port 0 was opened. (The client number may
vary.) At next, start client on hostB. The argument is the hostname
where server is running.

hostB% aseqnet hostA
sequencer opened: 132:0

Now events sent to hostA:128:0 is transferred to hostB:132:0, and vice
versa.

You can connect these ports arbitrary to other sequencer ports.
For example, connect hostB:132:0 to a MIDI output device 65:0. The
aconnect utility can be used for this:

hostB% aconnect 132:0 65:0

Events to hostA:128:0 will be delivered indirectly to hostB:65:0.
You'll hear MIDI sounds as following:

hostA% pmidi -p 128:0 foo.mid

The multiple clients may exist simultaneously. If hostC is connected
as a client to hostA, events from from hostA are sent to all connected
network clients, hostB and hostC. However, only one connection is
allowed from a client to a server.

To disconnect network, stop all clients before server by ctrl-C or
sending signal to them. The server will automatically quit.

The available options are:

-p port : specify the TCP port number or TCP service name.
Default value is 40002.
-s addr : explicit read-subscription to the given address
(client:addr).
-d addr : explicit write-subscription to the given address.
-v : verbose mode.
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