[ANN] jackdmp for Linux and MacOSX
[ANN] jackdmp for Linux and MacOSX
- Subject: [ANN] jackdmp for Linux and MacOSX
- From: Stéphane Letz <email@hidden>
- Date: Thu, 8 Dec 2005 18:17:55 +0100
jackdmp for Linux and MacOSX
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jackdmp is a C++ version of the Jack low-latency audio server (http://
www.jackaudio.org/index.php) for multi-processor machines. It is a
new implementation of the jack server core features that aims in
removing some limitations of the current design. The activation
system has been changed for a data flow model and lock-free
programming techniques for graph access have been used to have a more
dynamic and robust system.
- jackdmp use a new client activation model that allows simultaneous
client execution (on a smp machine) when parallel clients exist in
the graph (client that have the same inputs). This activation model
allows to better use available CPU on a smp machine, but also works
on mono-processor machine.
- jackdmp use a lock-free way to access (read/write) the client
graph, thus allowing connections/disconnection to be done without
interrupting the audio stream. The result is that connections/
disconnections are glitch-free.
- jackdmp can work in 2 different mode at the server level:
• "synchronous" activation : in a given cycle, the server waits for
all clients to be finished (similar to normal jackd)
• "asynchronous" activation : in a given cycle, the server does not
wait for all clients to be finished and use output buffer computed
the previous cycle. The "audible" result of this mode is that if a
client is not activated during one cycle, other clients may still run
and the resulting audio stream will still be produced (even if its
partial in some way). This mode usually result in fewer (less
audible) audio glitches in a loaded system.
OSX version
------------------
The published version uses Mach semaphores for server/client
synchronization. MIG generated Remote Procedure Calls (RPC) are used
for server/client communications. The CoreAudio driver derived from
jackd implementation is used.
The package contains:
- the compiled binaries with an installation script located in bin/osx
- the source code with an XCode project
- the component needed to use CoreAudio applications with Jack (the
JackRouter Jack/CoreAudio bridge)
WARNING !! WARNING !!
Users of the official JackOSX package MUST uninstall JackOSX (using
the script located in /Application/Jack) before installing and
testing jackdmp
The package is available at http://www.grame.fr/~letz/jackdmp_0.44.tgz
=============================================
Grame : Computer Music Research Laboratory
Web : http://www.grame.fr/Research
E-mail : email@hidden
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