The audio/jack port
jack-0.125.0p4 – low latency sound server (cvsweb github mirror)
Description
JACK is a low-latency audio server, written for POSIX conformant operating systems. It can connect a number of different applications to an audio device, as well as allowing them to share audio between themselves. Its clients can run in their own processes (ie. as normal applications), or can they can run within the JACK server (ie. as a "plugin"). JACK was designed from the ground up for professional audio work, and its design focuses on two key areas: synchronous execution of all clients, and low latency operation.WWW: http://jackaudio.org/
Readme
+----------------------------------------------------------------------- | Running ${PKGSTEM} on OpenBSD +----------------------------------------------------------------------- In this package of jackd, the 'dummy' and 'sndio' drivers are supported. The 'dummy' driver is mostly useful for testing jackd itself. The 'sndio' driver uses sndio(7). To start jackd with default driver parameters, use the command 'jackd -d'. By default, jackd runs in full-duplex mode with a relatively low latency. This may not be exactly what you want, and it may not be possible with all hardware. Therefore, some configuration options may be necessary to effectively use jackd. The 'sndio' driver options can be viewed with the command 'jackd -d sndio -h'. Below are some tips and caveats to consider when using jackd on OpenBSD. Some audio devices do not support full-duplex operation. If jackd errors out on startup with a message about opening a full-duplex device, this is likely the problem. If the device only supports playback, then the driver needs to be configured to use 0 input channels. For example 'jackd -d sndio -i 0' starts jackd in half-duplex play-only mode. By default jackd uses 2 periods (blocks) of 1024 frames each. This means there will be at most 2048 frames in the playback buffer. Some slower or loaded machines may not be able to keep the playback buffer from underrunning with these conditions. Jackd is designed to use 2 periods, so if underruns are observed, it is best to first increase the period size with the driver's -p option. The period size should be a power of two. The number of periods can be increased with the -n option. For example, 'jackd -d sndio -p 2048 -n 4'. The sndio driver uses 44100 Hz sampling rates by default. Some devices may not support the default sample rate. Or it may be that most of the audio that will pass through jackd is based on a different sample rate. Avoiding sample rate conversion will use fewer CPU cycles and preserve audio quality. The -r option can be used to change the sampling rate as in 'jackd -d sndio -r 48000'. The realtime option -R is commonly used on other operating systems. However, this option is inconsequential on OpenBSD. It is possible to run jackd on top of sndiod(1) with the 'sndio' driver. Note that jackd will use sndiod's block size as its period size. For instance: - stop sndiod(8) using rc.d(8) - add the following to /etc/rc.conf.local(8): sndiod_flags=-b 1024 -z 512 - start sndiod(8) - start jackd: $ jackd -d sndio -p 1024 -n 2 There is currently no MIDI driver in jack that works on OpenBSD.
Maintainer
The OpenBSD ports mailing-list
Categories
Library dependencies
Build dependencies
Reverse dependencies
Files
- /usr/local/bin/jack_alias
- /usr/local/bin/jack_bufsize
- /usr/local/bin/jack_connect
- /usr/local/bin/jack_disconnect
- /usr/local/bin/jack_evmon
- /usr/local/bin/jack_freewheel
- /usr/local/bin/jack_impulse_grabber
- /usr/local/bin/jack_iodelay
- /usr/local/bin/jack_latent_client
- /usr/local/bin/jack_load
- /usr/local/bin/jack_load_test
- /usr/local/bin/jack_lsp
- /usr/local/bin/jack_metro
- /usr/local/bin/jack_midi_dump
- /usr/local/bin/jack_midiseq
- /usr/local/bin/jack_midisine
- /usr/local/bin/jack_monitor_client
- /usr/local/bin/jack_netsource
- /usr/local/bin/jack_property
- /usr/local/bin/jack_rec
- /usr/local/bin/jack_samplerate
- /usr/local/bin/jack_server_control
- /usr/local/bin/jack_session_notify
- /usr/local/bin/jack_showtime
- /usr/local/bin/jack_simple_client
- /usr/local/bin/jack_simple_session_client
- /usr/local/bin/jack_transport
- /usr/local/bin/jack_transport_client
- /usr/local/bin/jack_unload
- /usr/local/bin/jack_wait
- /usr/local/bin/jackd
- /usr/local/include/jack/
- /usr/local/include/jack/control.h
- /usr/local/include/jack/intclient.h
- /usr/local/include/jack/jack.h
- /usr/local/include/jack/jslist.h
- /usr/local/include/jack/metadata.h
- /usr/local/include/jack/midiport.h
- /usr/local/include/jack/ringbuffer.h
- /usr/local/include/jack/session.h
- /usr/local/include/jack/statistics.h
- /usr/local/include/jack/thread.h
- /usr/local/include/jack/transport.h
- /usr/local/include/jack/types.h
- /usr/local/include/jack/uuid.h
- /usr/local/include/jack/weakjack.h
- /usr/local/include/jack/weakmacros.h
- /usr/local/lib/jack/
- /usr/local/lib/jack/inprocess.la
- /usr/local/lib/jack/inprocess.so
- /usr/local/lib/jack/intime.la
- /usr/local/lib/jack/intime.so
- /usr/local/lib/jack/jack_dummy.la
- /usr/local/lib/jack/jack_dummy.so
- /usr/local/lib/jack/jack_net.la
- /usr/local/lib/jack/jack_net.so
- /usr/local/lib/jack/jack_sndio.la
- /usr/local/lib/jack/jack_sndio.so
- /usr/local/lib/libjack.la
- /usr/local/lib/libjack.so.2.0
- /usr/local/lib/libjackserver.la
- /usr/local/lib/libjackserver.so.2.0
- /usr/local/lib/pkgconfig/jack.pc
- /usr/local/man/man1/jackd.1
- /usr/local/man/man1/jackstart.1
- /usr/local/share/doc/pkg-readmes/jack