Jack

(audio connection kit)

Netjack2

jackdbus master (start/stop script)

#!/bin/bash

JCTL=/usr/bin/jack_control

A2JMIDID=/usr/bin/a2jmidid

JLOAD=/usr/bin/jack_load

JUNLOAD=/usr/bin/jack_unload

PERIOD=${2:-128}

SLEEP=/bin/sleep

start() {

"$JCTL" ds alsa

"$JCTL" dps device hw:U192k

"$JCTL" dps rate 48000

"$JCTL" dps nperiods 2

"$JCTL" dps period "$PERIOD"

"$JCTL" start

"$SLEEP" 3

"$JLOAD" netmanager -i -c

"$SLEEP" 3

"$A2JMIDID" -e &

}

stop() {

"$JUNLOAD" netmanager

"$SLEEP" 3

killall a2jmidid

"$SLEEP" 3

"$JCTL" stop

}

status() {

"$JCTL" status

}

info() {

"$JCTL" dp

}

case "$1" in

'start') start ;;

'stop') stop ;;

'status') status ;;

'info') info ;;

esac

exit 0

jackdbus slave (start/stop script)

#!/bin/bash

JCTL=/usr/bin/jack_control

MIP="192.168.xxx.xxx"

start() {

"$JCTL" ds net

"$JCTL" dps multicast-ip "$MIP"

"$JCTL" start

}

stop() {

"$JCTL" stop

}

status() {

"$JCTL" status

}

info() {

"$JCTL" dp

}

case "$1" in

'start') start ;;

'stop') stop ;;

'status') status ;;

'info') info ;;

esac

exit $?

jackd (Master)

The master is configured like a normal setup with the addition of starting the netmanager subsystem

The netmanager has to be started after the jack server is already running. You can enter the command 'jack_load netmanager' on the command line or automate it with qjackctl (see left).

Slave

The slave has to be started with the 'net' subsystem.

Command line

sh# jackd -R -S -s -d net -l 2 | logger -t 'jackd' &

-R : enable realtime

-S : enable sync mode

-s : enable soft mode

-l : set the network latency to 1 cycle

QjackCtl

Connecting Pulse Audio to Jack

sh$ pactl load-module module-jack-source

sh$ pactl load-module module-jack-sink

sh$ pacmd set-default-sink jack_out

Virtual Midi Controller (virmidi)

sh# modprobe snd_virmidi snd_index=0 midi_devs=4

#!/bin/bash

/usr/bin/jackd -R -S -s -d net -l 2 | /usr/bin/logger -t 'jackd' &

sleep 3

/usr/bin/a2jmidid | /usr/bin/logger -t 'a2jmidid' &

/usr/bin/pactl load-module module-jack-source

/usr/bin/pactl load-module module-jack-sink

exit 0

Multimidicast (Midi over Ethernet)

http://llg.cubic.org/tools/multimidicast/

sh# wget http://llg.cubic.org/tools/multimidicast/multimidicast-1.3.tar.gz

sh# apt install libasound2 libasound2-dev

sh# tar xvf multimidicast-1.3.tar.gz && cd multimidicast-1.3

sh# make

g++ -Wall -O2 -c -o multimidicast.o multimidicast.cpp

g++ -o multimidicast multimidicast.o -lasound

sh# ./multimidicast -h

options: -i <interface> - use specific network interface

-h - display this text

-q - quiet, don't show MIDI and network events

-b <bytes> - set MIDI buffer size, default: 250000 bytes

libasound2
libasound2-dev

How to list available alsa devices on the system

$ ls /proc/asound

card0 card1 cards devices hwdep modules oss PCH pcm seq timers U192k version

$ cat /proc/asound/cards

0 [PCH ]: HDA-Intel - HDA Intel PCH

HDA Intel PCH at 0xf7918000 irq 32

1 [U192k ]: USB-Audio - UMC404HD 192k

BEHRINGER UMC404HD 192k at usb-0000:00:14.0-3, high speed

$ cat /proc/asound/pcm

00-00: ALC269VB Analog : ALC269VB Analog : playback 1 : capture 1

00-03: HDMI 0 : HDMI 0 : playback 1

01-00: USB Audio : USB Audio : playback 1 : capture 1

$ aplay -l

**** List of PLAYBACK Hardware Devices ****

card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]

Subdevices: 1/1

Subdevice #0: subdevice #0

card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]

Subdevices: 1/1

Subdevice #0: subdevice #0

card 1: U192k [UMC404HD 192k], device 0: USB Audio [USB Audio]

Subdevices: 0/1

Subdevice #0: subdevice #0

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