From b939b2e68d59a297da8551ebe3347ea79628be64 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Sun, 13 Jun 2021 12:20:42 -0600
Subject: [PATCH] libardour: provide a global function for resetting
 performance meters

---
 libs/ardour/ardour/ardour.h |  3 +++
 libs/ardour/globals.cc      | 17 +++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/libs/ardour/ardour/ardour.h b/libs/ardour/ardour/ardour.h
index 71d7c4d553..6fba7992f0 100644
--- a/libs/ardour/ardour/ardour.h
+++ b/libs/ardour/ardour/ardour.h
@@ -49,6 +49,7 @@ namespace MIDI {
 namespace ARDOUR {
 
 	class AudioEngine;
+	class Session;
 
 	extern LIBARDOUR_API PBD::Signal1<void,std::string> BootMessage;
 	extern LIBARDOUR_API PBD::Signal3<void,std::string,std::string,bool> PluginScanMessage;
@@ -94,6 +95,8 @@ namespace ARDOUR {
 	 */
 	LIBARDOUR_API void check_for_old_configuration_files ();
 	LIBARDOUR_API int handle_old_configuration_files (boost::function<bool (std::string const&, std::string const&, int)> ui_handler);
+
+	LIBARDOUR_API void reset_performance_meters (Session*);
 }
 
 #endif /* __ardour_ardour_h__ */
diff --git a/libs/ardour/globals.cc b/libs/ardour/globals.cc
index 5bc9c6fbe3..d1f3962a9d 100644
--- a/libs/ardour/globals.cc
+++ b/libs/ardour/globals.cc
@@ -125,6 +125,7 @@
 #include "ardour/region.h"
 #include "ardour/route_group.h"
 #include "ardour/runtime_functions.h"
+#include "ardour/session.h"
 #include "ardour/session_event.h"
 #include "ardour/source_factory.h"
 #include "ardour/transport_fsm.h"
@@ -993,3 +994,19 @@ ARDOUR::format_data_width (ARDOUR::SampleFormat format)
 			return 32;
 	}
 }
+
+void
+ARDOUR::reset_performance_meters (Session *session)
+{
+	if (session) {
+		for (size_t n = 0; n < Session::NTT; ++n) {
+			session->dsp_stats[n].queue_reset ();
+		}
+	}
+	for (size_t n = 0; n < AudioEngine::NTT; ++n) {
+		AudioEngine::instance()->dsp_stats[n].queue_reset ();
+	}
+	for (size_t n = 0; n < AudioBackend::NTT; ++n) {
+		AudioEngine::instance()->current_backend()->dsp_stats[n].queue_reset ();
+	}
+}