websockets provide BBT

libs/surfaces/websockets/dispatcher.cc

@@ -130,6 +130,7 @@ WebsocketsDispatcher::update_all_nodes (Client client)
 
 	update (client, Node::transport_tempo, transport ().tempo ());
 	update (client, Node::transport_time, transport ().time ());
+	update (client, Node::transport_bbt, transport ().bbt ());
 	update (client, Node::transport_roll, transport ().roll ());
 	update (client, Node::transport_record, transport ().record ());
 }

libs/surfaces/websockets/feedback.cc

@@ -210,6 +210,7 @@ bool
 ArdourFeedback::poll () const
 {
 	update_all (Node::transport_time, transport ().time ());
+	update_all (Node::transport_bbt, transport ().bbt ());
 
 	Glib::Threads::Mutex::Lock lock (mixer ().mutex ());
 

libs/surfaces/websockets/state.h

@@ -44,6 +44,7 @@ namespace Node
 	const std::string strip_plugin_param_value       = "strip_plugin_param_value";
 	const std::string transport_tempo                = "transport_tempo";
 	const std::string transport_time                 = "transport_time";
+	const std::string transport_bbt                  = "transport_bbt";
 	const std::string transport_roll                 = "transport_roll";
 	const std::string transport_record               = "transport_record";
 } // namespace Node

libs/surfaces/websockets/transport.cc

@@ -16,6 +16,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include <sstream>
+
 #include "ardour/tempo.h"
 
 #include "transport.h"
@@ -52,6 +54,16 @@ ArdourTransport::time () const
 	return static_cast<double>(t) / static_cast<double>(f);
 }
 
+std::string
+ArdourTransport::bbt () const
+{
+	const samplepos_t t = session ().transport_sample ();
+	const Temporal::BBT_Time bbt_time = Temporal::TempoMap::fetch()->bbt_at (timepos_t (t));
+	std::ostringstream oss;
+	bbt_time.print_padded(oss);
+	return oss.str();
+}
+
 bool
 ArdourTransport::roll () const
 {

libs/surfaces/websockets/transport.h

@@ -19,6 +19,8 @@
 #ifndef _ardour_surface_websockets_transport_h_
 #define _ardour_surface_websockets_transport_h_
 
+#include <string>
+
 #include "component.h"
 
 namespace ArdourSurface {
@@ -35,6 +37,8 @@ public:
 
 	double time () const;
 
+	std::string bbt () const;
+
 	bool roll () const;
 	void set_roll (bool);