* Unlinked panners now retain their state during copy/paste.
* Linked send panners can no longer override parent route panning
* Unlinked panner state is retained across link/unlink.
A call to `transcoder_exe (unused, unused)` passes the same
string reference for `ffmpeg` and `ffprobe`. If this happens
during the first call of this function, the path for the latter
is cached for both external tools.
This is a revision of the initial API 8ba7df9105, to
address issues with dynamica ports (fa791ae9cc).
* Group meter + scope/monitor per port (atomic access)
* Use shared pointer to allow access while ports change
* Use RCU to update port map
* Add/remove ports without clearing the map
* Add signal to notify GUI about Input Port changes
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
