Until now, Mixer not only was responsible for rendering audio buffers
but also managed writing them to audio backend (through a FIFO) and
handled various quality related parameters.
All this functionality has been moved into the new AudioOutputContext
class. It glues together AudioBackend (formerly called AudioDevice),
global quality settings and the Mixer.
The AudioOutputContext class creates a FifoWriter which calls
Mixer::renderNextBuffer() and writes the output into the BufferFifo of
the AudioOutputContext it belongs to. The BufferFifo is read by the
according AudioBackend which belongs to the AudioOutputContext as well.
The AudioOutputContext also handles resampling in case the AudioBackend
wants the buffers in a different samplerate.
During this rewrite the Mixer class and the according source files have
been renamed from "mixer" to "Mixer". This results in small changes
all over LMMS' code base.
Declarations and implementations of MixerWorkerThread and ThreadableJob
have been moved into separate source files.
Furthermore there were some improvements to MixerWorkerThreads.
MixerWorkerThread::processJobQueue() does not return until the job
queue completely has been processed. This way each thread can "help"
to finish processing the queue and does not get back to sleep until
all of the work is done.
Management of the queue is now done via an array of QAtomicPointers.
Items that are non-NULL still need to be processed while NULL-items
were taken from the queue (i.e. in progress or done). Thus we do not
need to deal with ThreadableJob-states within MixerWorkerThread anymore.
In Mixer, the old C-macro based code has been replaced by an OOP-like
design. Management of job queue now happens via some static member
methods of MixerWorkerThread. All the moved code still needs to be
splitted into some new files but here's a first dirty version.
All objects that are intended to be processed by MixerWorkerThreads
have to inherit ThreadableJob (name of class is subject of change).
One can add jobs to the job queue even if the queue is already being
processed. This is merely important for multithreading with upcoming
FX sends support.
Most files and most of the core classes and their methods have been
renamed to match new coding style conventions:
391 files changed, 25400 insertions(+), 25598 deletions(-)
Furthermore splitted some files where model and view classes were
declared or implemented together in the same file.
Should be tested thoroughly as I might have missed renaming some virtual
methods or SIGNAL/SLOT parameters.
Tobias Doerffel