Jack audio connection kit mac os

Requirements

Overview

JACK relies on two types of platform-specific headers:

OS-specific headers take precedence over CPU-specific headers.

The JACK configure.host script and its system-dependent header directories were adapted from the libstdc++-v3 component of the GNU Compiler Collective, http://gcc.gnu.org.

C Language Dependencies

JACK is written to conform with C99, as defined in International Standard ISO/IEC 9899:1999. Because many existing compilers do not fully support this standard, some new features should be avoided for portablility reasons. For example, variables should not be declared in the middle of a compound statement, because many compilers still cannot handle that language extension.

Operating System Dependencies

JACK is written for a POSIX environment compliant with IEEE Std 1003.1-2001, ISO/IEC 9945:2003, including the POSIX Threads Extension (1003.1c-1995) and the Realtime and Realtime Threads feature groups. When some needed POSIX feature is missing on a platform, the preferred solution is to provide a substitute, as with the fakepoll.c implementation for Mac OS X.

Whenever possible, OS dependencies should be auto-detected by configure . Sometimes they can be isolated in OS-specific header files, found in subdirectories of config/os and referenced with a name.

If conditional compilation must be used in mainline platform-independent code, avoid using the system name. Instead, #define a descriptive name in , and test it like this:

Be sure to place any generic implementation alternative in the #else or use an #ifndef , so no other code needs to know your conditional labels.

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Introduction

JACK is a low-latency audio server, written for any operating system that is reasonably POSIX compliant. It currently exists for Linux, OS X, Solaris, FreeBSD and Windows. It can connect several client applications to an audio device, and allow them to share audio with each other. Clients can run as separate processes like normal applications, or within the JACK server as «plugins».

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.

JACK Overview

Traditionally it has been hard if not impossible to write audio applications that can share data with each other. In addition, configuring and managing audio interface hardware has often been one of the most complex aspect of writing audio software.

JACK changes all this by providing an API that does several things:

For programmers with experience of several other audio APIs such as PortAudio, Apple’s CoreAudio, Steinberg’s VST and ASIO as well as many others, JACK presents a familiar model: your program provides a «callback» function that will be executed at the right time. Your callback can send and receive data as well as do other signal processing tasks. You are not responsible for managing audio interfaces or threading, and there is no «format negotiation»: all audio data within JACK is represented as 32 bit floating point values.

For those with experiences rooted in the Unix world, JACK presents a somewhat unfamiliar API. Most Unix APIs are based on the read/write model spawned by the «everything is a file» abstraction that Unix is rightly famous for. The problem with this design is that it fails to take the realtime nature of audio interfaces into account, or more precisely, it fails to force application developers to pay sufficient attention to this aspect of their task. In addition, it becomes rather difficult to facilitate inter-application audio routing when different programs are not all running synchronously.

Using JACK within your program is very simple, and typically consists of just:

• calling jack_client_open() to connect to the JACK server.
• registering «ports» to enable data to be moved to and from your application.
• registering a «process callback» which will be called at the right time by the JACK server.
• telling JACK that your application is ready to start processing data.

There is a lot more that you can do with JACK’s interfaces, but for many applications, this is all that is needed. The simple_client.c example demonstrates a complete (simple!) JACK application that just copies the signal arriving at its input port to its output port. Similarly, inprocess.c shows how to write an internal client «plugin» that runs within the JACK server process.

Reference

The JACK programming interfaces are described in several header files. We present them here broken into useful categories to make the API a little clearer:

The full API is described in:

• is the main JACK interface.
• provides interfaces for monitoring the performance of a running JACK server.
• allows loading and unloading JACK internal clients.
• defines a simple API for using lock-free ringbuffers. These are a good way to pass data between threads, when streaming realtime data to slower media, like audio file playback or recording.
• defines a simple transport control mechanism for starting, stopping and repositioning clients. This is described in the JACK Transport Design document.
• defines the main JACK data types.
• functions standardize thread creation for JACK and its clients.
• functions to handle reading and writing of MIDI data to a port
• functions that form the JACK session API
• the API for starting and controlling a JACK server
• the API for managing metadata about objects within JACK (clients and ports)

In addition, the tools directory provides numerous examples of simple JACK clients that nevertheless use the API to do something useful. It includes

• a metronome.
• a recording client that can capture any number of channels from any JACK sources and store them as an audio file.
• command line clients to control the transport mechanism, change the buffer size and more.
• commands to load and unload JACK internal clients.
• tools for checking the status of a running JACK system.

Porting

JACK is designed to be portable to any system supporting the relevant POSIX and ANSI C standards. It currently runs under GNU/Linux, Mac OS X and Berkeley Unix on several different processor architectures. If you want to port JACK to another platform, please read the Porting JACK document.

License

Copyright (C) 2001-2019 by Paul Davis, Stephane Letz, Jack O’Quinn, Torben Hohn, Filipe Coelho and others.

JACK is free software; you can redistribute it and/or modify it under the terms of the GNU GPL and LGPL licenses as published by the Free Software Foundation, http://www.gnu.org. The JACK server uses the GPL, as noted in the source file headers. However, the JACK library is licensed under the LGPL, allowing proprietary programs to link with it and use JACK services. You should have received a copy of these Licenses along with the program; if not, write to the Free Software Foundation, Inc., 59 Temple Place — Suite 330, Boston, MA 02111-1307, USA.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

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Downloading JACK

Linux

• Binaries: please use your distribution’s package manager ( apt-get, yum, synaptic etc.)
• Source tarball: JACK 1.9.19.

macOS

• Intel 64bit Installer: JACK 1.9.19 macOS-intel.
• Universal Installer: JACK 1.9.19 macOS-universal.
• Source tarball: JACK 1.9.19.

For macOS 10.12 or higher.

Nightly builds are available through JACK2 GitHub actions.

Windows

• 32bit installer: JACK 1.9.19 win32.
• 64bit installer: JACK 1.9.19 win64.
• Source tarball: JACK 1.9.19.

For Windows 7 or higher. 64bit builds provide mixed 32/64bit support.

Nightly builds are available through JACK2 GitHub actions.

JACK Source Code Repository

JACK uses Git as its source control system. Our central git repository is hosted by GitHub. We are currently working toward linking the repositories for JACK1 and JACK2 but this work is not complete, so for now the commands to get a copy of the source are a little different depending on which tree/version you want.

JACK2 Git Repository

Those without write access can access the repository with this command:

You can also point a web browser at

to be able to browse current source code and full history with all the usual GitHub goodies.

Write Access

Those who have been granted write access and have supplied a public key can get to the repository with the following command:

JACK1 Git Repository

Those without write access can access the repository with these commands:

You can also point a web browser at

to be able to browse current source code and full history with all the usual GitHub goodies.

Write Access

Those who have been granted write access and have supplied a public key can clone the repository with the following commands:

You must then edit the .git/config file within jack1 so that the submodule entries correctly reference the write-access URL. They should look like this:

Eventually the same setup for the submodules will be required for both JACK2 and JACK1, but this is only the case for JACK1 at this time.

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Jack audio connection kit mac os

Just a small heads up to mention that macOS and Windows nightly builds are now available for JACK2.

You can find them in the JACK2 GitHub actions section, each successful build will have matching artifacts.
When you open a pull request, builds will be automatically generated.
(pending approval from JACK2 maintainers, but there is typically no reason not to approve)

These artifacts include macOS-intel, macOS-universal, Ubuntu 20.04, Windows 32bit and Windows 64bit builds.
Note that neither QjackCtl or JACK-Router are included in these builds, only JACK.

JACK2 v1.9.19 release

On 2021-07-16 by falkTX

A new version of JACK2 has just been released.
You can grab the latest release source code at https://github.com/jackaudio/jack2/releases and macOS/Windows installers at https://github.com/jackaudio/jack2-releases/releases.

This release focuses on 2 main things: jack_position_t::tick_double addition and forced alignment of a few internal data structures. A few other fixes were made as contributed by developers.

This relase adds tick_double to the jack_position_t struct and JackTickDouble as a validation flag for it. Since older versions of JACK do not expose this variable, the macro JACK_TICK_DOUBLE is provided, which can be used as build-time detection.

The alignment change is because the packed structure layouts as used in JACK2 need to be naturally aligned in order to be accessed atomically in some systems. A non-aligned read or write can result in a “Bus error”, which brings down jackd. This seems to only be relevant on certain ARM systems, as JACK2 was obviously working before this change for most people.
As a consequence of this change, the internal protocol version was bumped to 9, which requires the restart of the JACK server after the update.

The official changelog is:

• Add jack_position_t::tick_double, and flags around it
• Add zalsa “-w” argument to wait for soundcard to be available
• Bump internal protocol version to 9 (due to struct alignment)
• Fix alignment of fields for atomic accesses
• Fix build for platforms needing __STDC_FORMAT_MACROS
• Fix compilation of documentation

External changes, related to macOS/Windows installer:

• Fix macOS microphone permissions on qjackctl macOS app bundle
• Update qjackctl to 0.9.4

Now, for the rationale behind the transport tick_double API update:

When using JACK transport to sync between clients with precise timing requirements (such as MIDI sequencers) rounding errors would accumulate and eventually make the separate clients out of sync.
This was observed in Carla and mod-host, which use audio plugins as JACK clients. Some MIDI plugins could miss notes due to rounding errors. This change has been deployed in MOD Devices for a couple of releases already and it is known to work (that is, it corrects the situation).

There were discussions on IRC about this potentially be unnecessary, that clients can just use bar_start_tick to store the non-integer part of the tick.
While the idea could work in theory, supporting it turns out to be non-trivial and from all applications that I have tested none implemented this part correctly.
Some applications do not set bar_start_tick at all, even though they can be run as transport master.

So since the transport API has padding members available for use and it has been unchanged for several years (so there won’t be a need to add more fields in the short or middle term), well let’s just go for it.

Here is example code for transport-listening clients:

JACK2 v1.9.18 release

On 2021-04-15 by falkTX

A new version of JACK2 has just been released.
You can grab the latest release source code at https://github.com/jackaudio/jack2/releases and macOS/Windows installers at https://github.com/jackaudio/jack2-releases/releases.

This release focuses on 2 main things: adding zalsa internal client and fixing macOS builds in regards to DB/meta-data.
A few other fixes were made as contributed by developers.

With zalsa now part of JACK2, we are one more step closer to JACK1 feature parity.
Worth noting that this is purely the client, we still need to add the switches to be able to load internal clients directly from jackd startup command-line.
Will be interesting to attempt to make this zalsa client also behave as a “slave adapter” like done with ALSA audioadapter , coremidi and winmme drivers.
Something for a future release.

On macOS, please restart the JACK server after updating to 1.9.18.

The official changelog is:

• Add zalsa_in/out as internal client (based on zita-a2j/j2a and jack1 code)
• Fix jack_midi_dump deadlock on close after the jack server is restarted
• Fix interrupt signal for linux futex waits
• Fix usage of meta-data in official macOS builds (private DB errors)
• Log error message when cleaning previous DB (macOS and Windows)

Now for those unaware of this whole “zalsa” thing…
This is basically zita-a2j/j2a by Fons Adriaensen repackaged as an internal client instead of being an external standalone tool.
JACK1 already added this a few years ago.
This zalsa version is slightly more up to date and with a few new fixes on top.

On supported systems, we can use it by running:

This will activate the “Mio” soundcard as an output in the JACK graph.
You can use jack_unload zalsa_out to deactivate it, or alternatively control the start/stop purely in CLI with:

Which will automatically unload the internal client after Ctrl+C or SIGTERM.

Worth noting that, since internal clients run in the JACK server process, they will log/print information on that process and not on the jack_load one.
So watch out for that if you need to debug anything.

JACK2 v1.9.17 release

On 2021-01-15 by falkTX

A new version of JACK2 has just been released.
You can grab the latest release source code at https://github.com/jackaudio/jack2/releases and macOS/Windows installers at https://github.com/jackaudio/jack2-releases/releases.

This release focuses on improvements to the macOS and Windows binaries, now with macOS universal builds natively supporting Apple M1 hardware.
On M1 hardware, you can now have native arm64 JACK clients talk to Intel/x64 once and vice-versa.

On Windows, JACK-Router (the special ASIO driver that allows any ASIO-compatible application to talk to other JACK clients) has been brought back, now integrated with the installer so it is much easier to manage.
Also, 32-bit and 64-bit clients can now be mixed without any side-effects to the meta-data.

Please restart the JACK server after updating to 1.9.17 on those systems.

The official changelog is:

• Add jack-router to Windows installer, opt-in
• Fix jack_control stopping after first command iteration
• Fix library compat/current version under macOS
• Fix registry keys for Windows, add 32bit compat ones on 64bit
• Fix return codes of jackd on success
• Ignore DB_VERSION_MISMATCH error on windows, it is expected
• Remove old workaround for asio4all, as it breaks with jack-router
• Support for arm64 macOS builds
• Show welcome and license pages on windows installer
• Update QjackCtl used in macOS/Windows installers to v0.9.0, with some commits cherry-picked from develop branch

JACK2 v1.9.16 quick hot-fix (for v1.9.15)

On 2020-10-16 by falkTX

An issue was found on the last JACK2 release that caused a few applications to crash on start.
This is a quick hot-fix for that release. If you are running v1.9.15, please update.

Because of a new release being needed, we took the chance to remove the jack-router Windows code, as it now belongs in its own repository.
These two items are the full release.

You can grab the latest release source code at https://github.com/jackaudio/jack2/releases.

You can also grab the latest pre-built installers for macOS and Windows at https://github.com/jackaudio/jack2-releases/releases.
On other systems, ask your jack2 package maintainer to update to the latest release.

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