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add ::usable() method to TransportMaster objects to allow GUI to show their usability after backend/engine changes

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This commit is contained in:
Paul Davis 2019-09-16 13:46:06 -06:00
parent fb4cbb9f9e
commit 37d9ec34c8
4 changed files with 34 additions and 0 deletions
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11
libs/ardour/ardour/transport_master.h
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@ -231,6 +231,16 @@ class LIBARDOUR_API TransportMaster : public PBD::Stateful {
*/
virtual bool ok() const = 0;
/**
* reports to ARDOUR whether it is possible to use this slave
*
* @return - true if the slave can be used.
*
* Only the JACK ("Engine") slave is ever likely to return false,
* if JACK is not being used for the Audio/MIDI backend.
*/
virtual bool usable() const { return true; }
/**
* reports to ARDOUR whether the slave is in the process of starting
* to roll
@ -626,6 +636,7 @@ class LIBARDOUR_API Engine_TransportMaster : public TransportMaster
void reset (bool with_position);
bool locked() const;
bool ok() const;
bool usable() const;
samplecnt_t update_interval () const;
samplecnt_t resolution () const { return 1; }
bool requires_seekahead () const { return false; }

6
libs/ardour/engine_slave.cc
View file

@ -47,6 +47,12 @@ Engine_TransportMaster::init ()
{
}
bool
Engine_TransportMaster::usable () const
{
return AudioEngine::instance()->current_backend_name() == X_("JACK");
}
void
Engine_TransportMaster::check_backend()
{