NAME¶
jack_midi_clock - JACK MIDI Beat Clock Generator
SYNOPSIS¶
jack_midi_clock [
OPTIONS ] [
JACK-port]
*
DESCRIPTION¶
jack_midi_clock - JACK app to generate MCLK from JACK transport.
OPTIONS¶
- -b <bpm>, --bpm <bpm>
- default BPM (if jack timecode master in not available)
- -B, --force-bpm
- ignore jack timecode master
- -d <sec>, --resync-delay <sec>
- seconds between 'song-position' and 'continue' message
- -P, --no-position
- do not send song-position (0xf2) messages
- -T, --no-transport
- do not send start/stop/continue messages
- -h, --help
- display this help and exit
- -V, --version
- print version information and exit
jack_midi_clock sends MIDI beat clock message if jack-transport is rolling. it
also sends start, continue and stop MIDI realtime messages whenever the
transport changes state (unless
-T option is used).
In order for jack_midi_clock to send clock messages, a JACK timecode master must
be present and provide the tempo map (bar, beat, tick). Alternatively the
-b option can be used to set a default BPM value. If a value larger
than zero is given, it will be used if no timecode master is present. Combined
with the
-B option it can used to override and ignore the JACK timecode
master and only act on transport state alone.
Either way, jack_midi_clock will never act as timecode master itself.
Note that song-position information is only sent if a timecode master is present
ad the
-P option is not given.
To allow external synths to accurately sync to song-position, there is a two
second delay between the 'song-position changed' message (which is not a MIDI
realtime message) and the 'continue transport' message. This delay can be
configured with the
-d option and is only relevant for if playback
starts at a bar|beat|tick other than 1|1|0 in which case a 'start' message is
sent immediately.
jack_midi_clock runs until it receives a HUP or INT signal or jackd is
terminated.
See also:
jack_transport(1),
jack_mclk_dump(1)
REPORTING BUGS¶
Report bugs to Robin Gareus <robin@gareus.org>
Website:
https://github.com/x42/jack_midi_clock/
COPYRIGHT¶
Copyright © GPL 2013 Robin Gareus <robin@gareus.org>
Copyright © GPL 2009 Gabriel M. Beddingfield
<gabriel@teuton.org>