From ff7fe6d4d6c0d966327f553118255444f5b589e3 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 11 Dec 2019 14:52:46 -0700
Subject: [PATCH] when loading a session into a running instance, if the SR
 doesn't match the engine, stop engine and show dialog

---
 gtk2_ardour/ardour_ui.h          |  2 ++
 gtk2_ardour/ardour_ui_session.cc | 59 ++++++++++++++++++++++++++++----
 2 files changed, 54 insertions(+), 7 deletions(-)

diff --git a/gtk2_ardour/ardour_ui.h b/gtk2_ardour/ardour_ui.h
index da62ce2062..867ef7b27a 100644
--- a/gtk2_ardour/ardour_ui.h
+++ b/gtk2_ardour/ardour_ui.h
@@ -212,6 +212,8 @@ public:
 	void finish();
 
 	int load_session (const std::string& path, const std::string& snapshot, std::string mix_template = std::string());
+	int load_session_stage_two (const std::string& path, const std::string& snapshot, std::string mix_template = std::string());
+	void audio_midi_setup_reconfigure_done (int response, std::string path, std::string snapshot, std::string mix_template);
 	bool session_load_in_progress;
 	int build_session (const std::string& path, const std::string& snapshot, ARDOUR::BusProfile const *);
 	bool session_is_new() const { return _session_is_new; }
diff --git a/gtk2_ardour/ardour_ui_session.cc b/gtk2_ardour/ardour_ui_session.cc
index 8550b5e235..4cb73619e5 100644
--- a/gtk2_ardour/ardour_ui_session.cc
+++ b/gtk2_ardour/ardour_ui_session.cc
@@ -337,21 +337,66 @@ ARDOUR_UI::load_session (const std::string& path, const std::string& snap_name,
 	}
 	PBD::Unwinder<bool> lsu (session_load_in_progress, true);
 
-	Session *new_session;
 	int unload_status;
-	int retval = -1;
+	bool had_session = false;
 
 	if (_session) {
+		had_session = true;
+
 		unload_status = unload_session ();
 
-		if (unload_status < 0) {
-			goto out;
-		} else if (unload_status > 0) {
-			retval = 0;
-			goto out;
+		if (unload_status != 0) {
+			hide_splash ();
+			return -1;
+		}
+	}
+
+	if (had_session) {
+		float sr;
+		SampleFormat sf;
+		string pv;
+
+		Session::get_info_from_path (Glib::build_filename (path, snap_name + statefile_suffix), sr, sf, pv);
+
+		/* this will stop the engine if the SR is different */
+
+		audio_midi_setup->set_desired_sample_rate (sr);
+
+		if (!AudioEngine::instance()->running()) {
+			audio_midi_setup->set_position (WIN_POS_CENTER);
+			audio_midi_setup->present ();
+			audio_midi_setup->signal_response().connect (sigc::bind (sigc::mem_fun (*this, &ARDOUR_UI::audio_midi_setup_reconfigure_done), path, snap_name, mix_template));
+			/* not done yet, but we're avoiding modal dialogs */
+			return 0;
+		}
+	}
+
+	return load_session_stage_two (path, snap_name, mix_template);
+}
+
+void
+ARDOUR_UI::audio_midi_setup_reconfigure_done (int response, std::string path, std::string snap_name, std::string mix_template)
+{
+	switch (response) {
+	case Gtk::RESPONSE_DELETE_EVENT:
+		break;
+	default:
+		if (!AudioEngine::instance()->running()) {
+			return; // keep dialog visible, maybe try again
 		}
 	}
 
+	audio_midi_setup->hide();
+
+	(void) load_session_stage_two (path, snap_name, mix_template);
+}
+
+int
+ARDOUR_UI::load_session_stage_two (const std::string& path, const std::string& snap_name, std::string mix_template)
+{
+	Session *new_session;
+	int retval = -1;
+
 	BootMessage (string_compose (_("Please wait while %1 loads your session"), PROGRAM_NAME));
 
 	try {
-- 
2.30.2