Virtual MIDI

Rozhuk Ivan [email protected] 2024-2025

Creates software MIDI devices for H/W sound cards without MIDI support.

virtual_midi: creates raw MIDI device backed to H/W sound card.\ It is tinny wrapper to send MIDI events to software synthesizer backend.\ Only FluidSynth based backend implemented.

virtual_oss_sequencer: creates OSS sequencer device that emulate kernel sequencer and work with all available raw MIDI devices in system.\ It handles: timer, enum and panic commands, all other commans is send to MIDI devices.

Licence

BSD licence.

• maintainers must show this message after installation:

!!! NOTICE !!!

FreeBSD Foundation refuses to support this project.

!!! NOTICE !!!

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Compilation

FreeBSD/DragonFlyBSD

sudo pkg install devel/git devel/cmake-core audio/fluidsynth audio/fluid-soundfont
git clone https://github.com/rozhuk-im/virtual_midi.git
cd virtual_midi
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=true ..
make -j 16

Usage

virtual_midi

Usage: virtual_midi [options]
options:
	-help, -? 				Show help
	-daemon, -d 				Run as daemon
	-pid, -p <pid>				PID file name
	-user, -u <user>			Change uid
	-group, -g <group>			Change gid
	-threads, -t <cuse_threads>		CUSE threads count
	-vdev, -V <virtual_device_name>		New virtual MIDI device base name. Default: midi
	-odrv, -o <output_driver_name>		Output sound driver name. Default: oss
	-odev, -O <output_device_name>		Output device name. Default: /dev/dsp
	-soundfont, -s <soundfont_file_name>	Soundfont file name. Default: /usr/local/share/sounds/sf2/FluidR3_GM.sf2

virtual_oss_sequencer

virtual_oss_sequencer     Create virtual sequencer device
Usage: virtual_oss_sequencer [options]
options:
	-help, -? 				Show help
	-daemon, -d 				Run as daemon
	-pid, -p <pid>				PID file name
	-user, -u <user>			Change uid
	-group, -g <group>			Change gid
	-threads, -t <cuse_threads>		CUSE threads count
	-vdev, -V <virtual_device_name>		New virtual MIDI device base name. Default: sequencer
	-prefix, -P <out_device_name_prefix>	Output devices name prefix. Use multiple times if you need more than 1 prefix. Default: midi, umidi

Tested with

• playmidi (audio/playmidi)
• playumidi (audio/playumidi)
• dmidiplayer (audio/dmidiplayer)
• wine-devel (emulators/wine-devel with OSS) + notation player 5 (win64)
• audio/alsa-seq-server - it is ALSA sequencer daemon that proxy MIDI@ALSA to raw midi devices -- aplaymidi (audio/alsa-utils) -- wine-devel (emulators/wine-devel with ALSA) + notation player 5 (win64, win32 does not work)