Adjusts the permissions of linux futexes when promiscuous mode is enabled.

Includes optimizations for internal clients, but not enabled yet.

Patch by Thomas Brand <tom@trellis.ch> and in accordance with jackd1
code base.

It is already defined by conf.define().

Call JackAlsaDriver::Close() when alsa_driver_new() fails, to
release devices acquired just before that call. Otherwise
JackAlsaDriver::Open() will never succeed again, as re-acquiring the
same device will fail with "A handler is already registered" DBus error.

The midi thread was always late after 2^31-1 Samples (~13.5h at 44.1kHz), because when there's no time limit, a uint64_t sample counter was compared against a signed 32bit INT_MAX to determine lateness. Now the CPU lockup will occur only after ~3 million years (at 192kHz), and because of the overflow it will presumably fix itself after a few milliseconds.

It's used for get_cycles() implementation, but it's never used.
On certain architectures it gives a warning which is be confusing.

This driver is very similar to the JackNetDriver, but instead of connecting
through the network, it connects to its upstream server through standard jack
API. So it can only reach local servers which must be running as the same user
or in promiscuous mode.

The main use case is the multi-user, multi-session, shared workstation:

 - a classic server with hw driver is launched system-wide at boot time, in
   promiscuous mode, optionaly restricted to the audio group
 - in each user session, a jackdbus server is automatically started with
   JackProxyDriver as master driver, automatically connected to the
   system-wide one
 - optionaly, each user run PulseAudio with a pulse-jack bridge

- fixed compiler warning
- fixed possible cropping of output

We have a proper clocksource in the kernel, use this instead.

This commit also fixes jackd on ARM boards with newer Linux kernels
where /proc/cpuinfo has changed.

Cross-ported from jackd1.

The parameter long description is used through the controlapi/dbus.
Now that jack_control displays the constraints, the dither parameter
long description servers no purpose.

The parameter long description is used through the controlapi/dbus.
Now that jack_control displays the constraints, the dither parameter
long description servers no purpose.

Descriptor initialization reduces risk of mismatch between array size
and element initialization. It also improves code readability by
separating the parameter descriptions separate from the code that
composes the enum constraint structures.

As a side effect this commit makes the self-connect-mode constraint
allocated in dedicated memory chunks, like others enum constraints.

The bug was present in the inital version of the code,
commit ebba58c8ee

There was no memory corruption because while
jack_driver_param_value_enum_t is smaller by 72 bytes than
jack_driver_param_constraint_desc_t, for enum constraints,
the last 240 (on 64bit) bytes are not used.

Removed a spurious initOK label in the driver_initialize function.

Added my name and those who helped me to the Changelog file.
Implemented various changes from a second code review by Stéphane;
JackIIODriver::Attach is now JackIIODriver::Open.
JackIIODriver::Detach is now JackIIODriver::Close.
driver_initialize now uses 'goto' on error to reduce replication.

No functional change, only whitespace.

This commit is based on Matt Flax's commits, just slightly polished and
split into logical blocks.

I did not review the code itself, since Stephane has already accepted
Matt's sequence into the codebase, thus indicating he's fine with the
changes.

This reverts commit 3087895772.

This reverts commit 23f5919c62.

This reverts commit d56717901a.

This reverts commit f08a3f4234.

Renamed JackIIODriver.C -> JackIIODriver.cpp
Renamed JackIIODriver.H -> JackIIODriver.h
Added delete iio_driver when failure is encountered when executing driver_initialize.

4a94e12986 broke it.

github close #54

Downgraded eigen3 and sox version requirements for building iio.
Switched to using IIOMMap to access the IIO subsystem.
Added the overloaded methods for JackIIODriver::Attach, JackIIODriver::Detach, JackIIODriver::Read and JackIIODriver::Write.
Rewrite the JackIIODriver.C code to work properly.

We recommend using symbolic names like hw:Live but when subdevices are used
regcomp() was failing to parse them. This changeset improves the algorithm
by using less assumptions.

* Don't attempt to use device reservation when card_to_num() mapping
   has failed. In case of card_to_num() failures, "Audio-1" device
   was reserved on start but not released on stop. This was causing
   next start to fail with out of memory error, and since previous
   commit, with "A handler is already registered for
   /org/freedesktop/ReserveDevice1/Audio-1" error.
 * In case of playback device reservation failure, release the
   capture device
 * Remove unused fReservedCaptureDevice and fReservedPlaybackDevice
   data members of the JackAlsaDriver class

We recommend this at http://jackaudio.org/device_naming

fixes #18

Patch by Adam Conrad <adconrad@canonical.com>, taken from Ubuntu's
jackd2 package.

Fixes linkage errors as described in

   http://permalink.gmane.org/gmane.comp.audio.jackit/25841