This allow to restore original engine port-names as set
by the backend. ALSA MIDI, CoreAudio, CoreMIDI and PortAudio
drivers can provide human readable physical port names for
some devices.
Various playlist operations can change region-properties
which results in Region::send_change being emitted while
the Playlist::RegionWriteLock is held.
This can result in recursive lock and/or deadlocks or crashes. e.g.
Insert time -> Playlist::shift -> Region::RegionPropertyChanged
-> EditorSummary::set_background_dirty -> Editor::session_gui_extents
-> Playlist::get_extent -> read-lock is taken after write-lock.
FoldbackStrip::update_send_box() GUI relies on ->fed_by() to
determine if a FB bus has a send from a route.
Under the hood this uses direct_feeds_according_to_reality()
and InternalSend::feeds(). When `allow_feedback` is set a send is
assumed to not directly feed a target (to allow loopbacks).
This mode must not be used for foldback sends.
Older compilers do not yet have fmaintrin.h. This fixes compile errors:
```
x86_functions_fma.cc:51:39: error: '_mm_fmadd_ss' was not declared in this scope
x86_functions_fma.cc:85:35: error: '_mm256_fmadd_ps' was not declared in this scope
x86_functions_fma.cc:106:35: error: '_mm256_fmadd_ps' was not declared in this scope
x86_functions_fma.cc:129:39: error: '_mm_fmadd_ss' was not declared in this scope
```
By supporting FMA extension, the number of instruction needed
for multiply accumulate to mix channels are reduced. Since,
this extension has been around since middle of 2012, more
computers have this instruction set available.
This also reverts 768d8362cd since it causes crashes
with various plugins (eg. surge.vst3).
Ardour now provides AudioBusBuffers for all audio I/O busses,
regardless of Ardour using those busses.
This fixes crashes of plugins that ignore ProcessData::numInputs
or ProcessData::numOutputs. Those plugins are expected to check
numChannels and channelBuffers for those excess channels, which are
0, NULL for unused busses.
ProcessData numInputs, numOutputs does correctly reflect actual
busses that are in-use (at most one main and one aux for each direction).
This should fix an issue with yabridge and MCompressor.
The plugin has two kMain inputs and expects ProcessData:inputs
to always have two entries, even if the second bus is explicitly
disabled.
see https://hastebin.com/ekewojiqep.txt
```
IComponent::activateBus(type = 0, dir = 0, index = 1, state = false)
data.numInputs = 1;
```
TODO: optimize (pre-allocate) if it works as expected
This significantly speeds up loading export formats that use ffmpeg.
A single call to ::transcoder_exe() took 300-400ms on Windows.
With multiple formats using an external transcoder, showing the
export dialog could take to 2-3 sec.
Those are blank to begin with, nothing is drawn, yet they'd still be
cached.
This may happen during an initial exposure (see 1a49d7d42b),
or when deleting regions.
The file has to be flushed to disk before it can be used.
This fixes an edge case only.
Since PeaksReady() is a cross-thread signal that calls
AudioRegionView::peaks_ready_handler in the GUI thread, the
function [almost] always completed, before the GUI was woken up
to schedule a WaveView render request (which uses the peak-file).
This is needed for threaded peak-file creation. The same
nested source may be accessed multiple times concurrently
(in addition to the butler thread reading it).
This fixes Bitrunner's "filum2020" session randomly showing garbage
waveforms.
