X-Git-Url: https://main.carlh.net/gitweb/?p=ardour.git;a=blobdiff_plain;f=libs%2Fardour%2Fsession_process.cc;h=eaa1d055038cf48b610933f40b3ca48da356f29e;hp=86f427f792c9164d8b60bb8bbc6c1795c2112b4e;hb=c8c6bca6587450ff64303dbc994a4cd28d6ce7aa;hpb=ced4378d0914bcfb926267772c45d1d23f3bed38

diff --git a/libs/ardour/session_process.cc b/libs/ardour/session_process.cc
index 86f427f792..eaa1d05503 100644
--- a/libs/ardour/session_process.cc
+++ b/libs/ardour/session_process.cc
@@ -43,7 +43,7 @@
 
 #include "midi++/mmc.h"
 
-#include "i18n.h"
+#include "pbd/i18n.h"
 
 using namespace ARDOUR;
 using namespace PBD;
@@ -75,6 +75,29 @@ Session::process (pframes_t nframes)
 
 	(this->*process_function) (nframes);
 
+	/* realtime-safe meter-position and processor-order changes
+	 *
+	 * ideally this would be done in
+	 * Route::process_output_buffers() but various functions
+	 * callig it hold a _processor_lock reader-lock
+	 */
+	boost::shared_ptr<RouteList> r = routes.reader ();
+	for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
+		if ((*i)->apply_processor_changes_rt()) {
+			_rt_emit_pending = true;
+		}
+	}
+	if (_rt_emit_pending) {
+		if (!_rt_thread_active) {
+			emit_route_signals ();
+		}
+		if (pthread_mutex_trylock (&_rt_emit_mutex) == 0) {
+			pthread_cond_signal (&_rt_emit_cond);
+			pthread_mutex_unlock (&_rt_emit_mutex);
+			_rt_emit_pending = false;
+		}
+	}
+
 	_engine.main_thread()->drop_buffers ();
 
 	/* deliver MIDI clock. Note that we need to use the transport frame
@@ -107,10 +130,10 @@ int
 Session::no_roll (pframes_t nframes)
 {
 	PT_TIMING_CHECK (4);
-	
+
 	framepos_t end_frame = _transport_frame + nframes; // FIXME: varispeed + no_roll ??
 	int ret = 0;
-	int declick = get_transport_declick_required();
+	int declick = (config.get_use_transport_fades() ? get_transport_declick_required() : false);
 	boost::shared_ptr<RouteList> r = routes.reader ();
 
 	if (_click_io) {
@@ -151,12 +174,12 @@ Session::no_roll (pframes_t nframes)
 int
 Session::process_routes (pframes_t nframes, bool& need_butler)
 {
-	int  declick = get_transport_declick_required();
+	int declick = (config.get_use_transport_fades() ? get_transport_declick_required() : false);
 	boost::shared_ptr<RouteList> r = routes.reader ();
 
 	const framepos_t start_frame = _transport_frame;
 	const framepos_t end_frame = _transport_frame + floor (nframes * _transport_speed);
-	
+
 	if (_process_graph) {
 		DEBUG_TRACE(DEBUG::ProcessThreads,"calling graph/process-routes\n");
 		if (_process_graph->process_routes (nframes, start_frame, end_frame, declick, need_butler) < 0) {
@@ -261,7 +284,7 @@ void
 Session::process_with_events (pframes_t nframes)
 {
 	PT_TIMING_CHECK (3);
-	
+
 	SessionEvent*  ev;
 	pframes_t      this_nframes;
 	framepos_t     end_frame;
@@ -335,6 +358,7 @@ Session::process_with_events (pframes_t nframes)
 	}
 
 	if (events.empty() || next_event == events.end()) {
+		try_run_lua (nframes); // also during export ?? ->move to process_without_events()
 		process_without_events (nframes);
 		return;
 	}
@@ -373,6 +397,8 @@ Session::process_with_events (pframes_t nframes)
 			send_midi_time_code_for_cycle (_transport_frame, end_frame, nframes);
 		}
 
+		ltc_tx_send_time_code_for_cycle (_transport_frame, end_frame, _target_transport_speed, _transport_speed, nframes);
+
 		framepos_t stop_limit = compute_stop_limit ();
 
 		if (maybe_stop (stop_limit)) {
@@ -400,6 +426,8 @@ Session::process_with_events (pframes_t nframes)
 				this_nframes = abs (floor(frames_moved / _transport_speed));
 			}
 
+			try_run_lua (this_nframes);
+
 			if (this_nframes) {
 
 				click (_transport_frame, this_nframes);
@@ -1196,7 +1224,7 @@ Session::compute_stop_limit () const
 		return max_framepos;
 	}
 
-	
+
 	bool const punching_in = (config.get_punch_in () && _locations->auto_punch_location());
 	bool const punching_out = (config.get_punch_out () && _locations->auto_punch_location());
 
@@ -1213,3 +1241,79 @@ Session::compute_stop_limit () const
 
 	return current_end_frame ();
 }
+
+
+
+/* dedicated thread for signal emission.
+ *
+ * while sending cross-thread signals from the process thread
+ * is fine in general, PBD::Signal's use of boost::function and
+ * boost:bind can produce a vast overhead which is not
+ * acceptable for low latency.
+ *
+ * This works around the issue by moving the boost overhead
+ * out of the RT thread. The overall load is probably higher but
+ * the realtime thread remains unaffected.
+ */
+
+void
+Session::emit_route_signals ()
+{
+	// TODO use RAII to allow using these signals in other places
+	BatchUpdateStart(); /* EMIT SIGNAL */
+	boost::shared_ptr<RouteList> r = routes.reader ();
+	for (RouteList::const_iterator ci = r->begin(); ci != r->end(); ++ci) {
+		(*ci)->emit_pending_signals ();
+	}
+	BatchUpdateEnd(); /* EMIT SIGNAL */
+}
+
+void
+Session::emit_thread_start ()
+{
+	if (_rt_thread_active) {
+		return;
+	}
+	_rt_thread_active = true;
+
+	if (pthread_create (&_rt_emit_thread, NULL, emit_thread, this)) {
+		_rt_thread_active = false;
+	}
+}
+
+void
+Session::emit_thread_terminate ()
+{
+	if (!_rt_thread_active) {
+		return;
+	}
+	_rt_thread_active = false;
+
+	if (pthread_mutex_lock (&_rt_emit_mutex) == 0) {
+		pthread_cond_signal (&_rt_emit_cond);
+		pthread_mutex_unlock (&_rt_emit_mutex);
+	}
+
+	void *status;
+	pthread_join (_rt_emit_thread, &status);
+}
+
+void *
+Session::emit_thread (void *arg)
+{
+	Session *s = static_cast<Session *>(arg);
+	s->emit_thread_run ();
+	pthread_exit (0);
+	return 0;
+}
+
+void
+Session::emit_thread_run ()
+{
+	pthread_mutex_lock (&_rt_emit_mutex);
+	while (_rt_thread_active) {
+		emit_route_signals();
+		pthread_cond_wait (&_rt_emit_cond, &_rt_emit_mutex);
+	}
+	pthread_mutex_unlock (&_rt_emit_mutex);
+}