Jack Audio Connection Kit

Three new functions were added in JACK API.
Automatic server startup was implemented. An OSS
JACK driver was added. A new option,
-m/--no-mlock, prevents attempts to lock memory,
even if --realtime is used. A new option,
-p/--port-max n, sets the maximum number of ports
the JACK server can manage. The default value is
128. A new option, -T/--temporary, causes jackd to
exit when the last client disconnects. The
configuration process was reworked for better
portability, which helps jack run on Mac OS X and
FreeBSD. A JACK thread initialization callback was
added.

The ALSA driver reports the actual sample rate, not the requested sample rate. This release handles hardware where playback and capture rates differ better. It has support for the native endian S24_3 format used by USB soundcards. Calls to jack_error() when jack_client_new() failed because the server was not running have been eliminated. Other calls to fprintf() in libjack have been eliminated. This release won't try to compile iec61883 if libraw1394 is below version 0.10.0.

This release has a new thread design and freewheeling mode. Portaudio runs on Linux.

There is a new transport API, and a new example client for controlling the transport. The first xrun on jackd startup is ignored. It is much more portable across processors. jackd -v (--verbose) now prints useful transport state change information for debugging JACK and clients. It also reports timeout info in seconds, not microseconds. There is a new dummy driver. The incomplete Solaris driver has been removed. Support has been added for asymmetric soundcards (for example, the es1968 chip has interleaved stereo for playback but non-interleaved stereo for capture). It now enforces power-of-two-sized buffer lengths. There are many minor bugfixes.

Jack no longer sends event messages to clients not yet running a dedicated JACK thread. More portable/forgiving #defines are included in the headers. A new --dither=none option was added for scripting help. Transport is initialized to "Stopped, frame zero" when jack is started, and some documentation updates were made.