The short answer: Jack 1 and Jack 2 are equivalent implementations of the same protocol. Jack 2 was originally written to add multi-processor support and to rewrite the internals using C++. Programs compiled against Jack 1 will work with Jack 2 without recompile (and vice versa). Jack 2 was originally planned to replace Jack 1, but this is no longer so and they are considered equivalent implementations. JACK is a C API, and so the C++ rewrite in Jack 2 only matters to the people who program/maintain jack.
Jun 13, 2017 This is a follow up video of my last Jack Audio lesson. This time we look at how you can bus midi around your computer using Jack Audio, the free.
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. Aug 23, 2017 Once GROM is installed into your car, your stereo will gain the following functionality: 1. USB playback - play the music stored on USB stick/mass storage device, control from car. Libjackmm is a C interface to the jack audio connection kit. Praxis Live is an hybrid visual live programming for creatives, for programmers, for students, for tinkerers. Pure Data is a real-time graphical programming environment for audio, video, and graphical processing. There are many alternatives to JACK Audio Connection Kit for Windows if you are looking to replace it. The most popular Windows alternative is VB-Audio VoiceMeeter, which is free.If that doesn't suit you, our users have ranked 17 alternatives to JACK Audio Connection Kit and nine of them are available for Windows so hopefully you can find a suitable replacement.
So, why would I choose one or the other? For most folks, it doesn't matter. For others, there is typically one or two features that cause them to prefer one or the other. See below for a detailed listing of the difference.
Jack Audio Connection Kit Auto Tune Reviews
Why isn't Jack 2 going to replace Jack 1? What happened? Simply put, the Jack 1 developers couldn't bring themselves to migrate to Jack 2. There is no animosity between the two developer groups (they do indeed work together nicely). Many of the Jack 1 developers disagree with the implementation details and class hierarchy of Jack 2, to the point where they would prefer working on the Jack 1 code. Note that this rejection is not because it was done in C++ (as the Jack 1 devs are accomplished C++ devs).
Are we going to have two JACKs forever? No. However nobody forsees a sane way to choose between Jack 1 and Jack 2. They're both very good and have loyal followings. However, when the time comes to work on Jack 3 (after Jack 1 is deemed 'complete') nobody expects this situation to happen again. As of 2018, both versions are maintained by falkTX. His current plan is to implement all Jack 1 features into Jack 2 and then slowly phase out Jack 1 into 'bugfix-only' mode (see the JACK2 v1.9.12 release notes for more detailed information).
So what about the version numbers ? Jack 1 approaches version 1.0. At the time of writing it is at version 0.121.3. Jack 2 approaches version 2.0 - at the time of writing it is at version 1.9.10. run jackd --version to find out the version that you have installed.
Here is a feature listing/comparison of the different jack implementations. Note that this list does not include tschack, Torben Hohn's experimental branch of Jack 1.
| Feature | Jack 1 | Jack 2 |
|---|---|---|
| Implements the JACK C API | Yes | Yes |
| Supports multiple processors (SMP) | No | Yes(1) |
| Allows apps to connect/disconnect without disrupting audio | No | Yes |
| Interacts with PulseAudio on Linux to share soundcard | No(6) | Yes |
| Has (optional) DBUS support(2) | No(6) | Yes |
| Can be used with WalkThrough_Dev_NetOne | Yes | Yes |
| Can be used with WalkThrough_User_NetJack2 | No | Yes |
| Is under active development | Yes(7) | Yes |
| Supports Linux/*nix/POSIX OS's | Yes | Yes |
| Supports OS X | Yes | Yes(4) |
| Supports Windows | No | Yes(5) |
| Supports Solaris/OpenSolaris | Yes? | Yes |
| Has builtin support for >1 soundcard on Linux | Yes | No |
| Supports metadata API | Yes | Yes |
| Has builtin integration with Linux MIDI | Yes | No |
| Has builtin integration with CoreMIDI (OS X) | No | Yes |
(1) Jack2 can run in 2 different modes : 'asynchronous' when the server does not wait for graph end for a given cycle but just write the outputs computed at the previous cycle. In this case an extra period of latency is added. Jack 2 can also be run in 'synchronous' mode, when the server waits for the graph activation end in a given cycle, in which case it works like Jack 1.
(2) DBUS support helps in integrating with PulseAudio and LADI.
(3) It's not that netjack2 is exclusively for Jack2, it's just that nobody has ported the protocol to Jack1.
(4) Integrated with JackOSX which allows CoreAudio clients become Jack clients (thanks to the JackRouter CoreAudio/Jack virtual audio device)
(5) ASIO clients can become Jack clients (thanks to the JackRouter ASIO/Jack bridge)
(6) DBUS and PulseAudio interaction support for jack1 is available through patch. Currently distributed as a modified jack1 tarball.
(7) Bugfix-only mode. Don't expect new features (you can still make a pull request if you really want though).
/little-snitch-for-os-x-1095.html. Other differences that don't lend themselves to feature tables:
- Jack 2 is more forgiving of misbehaving audio apps, whereas Jack 1 is not very tolerant (zombifying the client). (This behavior can be configured for both, but this is the default behavior.)
- Both will lock its memory to keep the kernel from moving it to the swap space on the hard disk (virtual memory). This helps avoid critical delays (xruns). Jack 1 locks all critical data (shared memory), process data, and executable code. Jack 2 locks all critical data (shared memory) on systems that support it (Linux, OS X and Windows).
- Jack 1 uses less RAM than Jack 2.
- SMP support is not always as valuable as you would think. If your applications are chained INPUT --> A --> B --> C --> OUTPUT, then it will not be able to utilize multiple processors. However, if you applications are independently generating audio to the OUTPUT, that is when 'parallel' sub-graph exist in the global graph, then they can be.
- Jack 2 allocates 2 threads on the client side, one for real-time computation (the one that calls the 'Process' callback) and one to handle all non real-time notifications (server context changes). Jack 1 only use 1 thread for real-time computation and notification handling.
- Jack 2 uses a large, fixed sized buffer for MIDI; Jack 1 defaults to a smaller size but allows the size to be set at run time.