write buffer stats to file on disk underrun/overrun

git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@5003 d708f5d6-7413-0410-9779-e7cbd77b26cf

2 files changed, 74 insertions, 1 deletions

diff --git a/gtk2_ardour/ardour_ui.cc b/gtk2_ardour/ardour_ui.cc
index 411f8d4f62..a3b699c809 100644
--- a/gtk2_ardour/ardour_ui.cc
+++ b/gtk2_ardour/ardour_ui.cc
@@ -901,8 +901,14 @@ void
 ARDOUR_UI::update_buffer_load ()
 {
 	char buf[64];
+	uint32_t c, p;
 
 	if (session) {
+		c = session->capture_load ();
+		p = session->playback_load ();
+		
+		push_buffer_stats (c, p);
+
 		snprintf (buf, sizeof (buf), _("Buffers p:%" PRIu32 "%% c:%" PRIu32 "%%"), 
 			  session->playback_load(), session->capture_load());
 		buffer_load_label.set_text (buf);
@@ -3011,10 +3017,60 @@ What you would like to do?\n"));
 }
 
 void
+ARDOUR_UI::push_buffer_stats (uint32_t capture, uint32_t playback)
+{
+	time_t now;
+	time (&now);
+
+	while (disk_buffer_stats.size() > 60) {
+		disk_buffer_stats.pop_front ();
+	}
+
+	disk_buffer_stats.push_back (DiskBufferStat (now, capture, playback));
+}
+
+void
+ARDOUR_UI::write_buffer_stats ()
+{
+	std::ofstream fout;
+	struct tm tm;
+	char buf[64];
+	char* path;
+
+	if ((path = tempnam (0, "ardourBuffering")) == 0) {
+		cerr << X_("cannot find temporary name for ardour buffer stats") << endl;
+		return;
+	}
+
+	fout.open (path);
+
+	if (!fout) {
+		cerr << string_compose (X_("cannot open file %1 for ardour buffer stats"), path) << endl;
+		return;
+	}
+
+	for (list<DiskBufferStat>::iterator i = disk_buffer_stats.begin(); i != disk_buffer_stats.end(); ++i) {
+		localtime_r (&(*i).when, &tm);
+		strftime (buf, sizeof (buf), "%T", &tm);
+		fout << buf << ' ' << (*i).capture << ' ' << (*i).playback << endl;
+	}
+	
+	disk_buffer_stats.clear ();
+
+	fout.close ();
+
+	cerr << "Ardour buffering statistics can be found in: " << path << endl;
+	free (path);
+}
+
+void
 ARDOUR_UI::disk_overrun_handler ()
 {
+
 	ENSURE_GUI_THREAD (mem_fun(*this, &ARDOUR_UI::disk_overrun_handler));
 
+	write_buffer_stats ();
+
 	if (!have_disk_speed_dialog_displayed) {
 		have_disk_speed_dialog_displayed = true;
 		MessageDialog* msg = new MessageDialog (*editor, _("\
@@ -3031,8 +3087,11 @@ quickly enough to keep up with recording.\n"));
 void
 ARDOUR_UI::disk_underrun_handler ()
 {
+
 	ENSURE_GUI_THREAD (mem_fun(*this, &ARDOUR_UI::disk_underrun_handler));
 
+	write_buffer_stats ();
+
 	if (!have_disk_speed_dialog_displayed) {
 		have_disk_speed_dialog_displayed = true;
 		MessageDialog* msg = new MessageDialog (*editor,
diff --git a/gtk2_ardour/ardour_ui.h b/gtk2_ardour/ardour_ui.h
index a0c84a18d8..29acce6377 100644
--- a/gtk2_ardour/ardour_ui.h
+++ b/gtk2_ardour/ardour_ui.h
@@ -20,6 +20,8 @@
 #ifndef __ardour_gui_h__
 #define __ardour_gui_h__
 
+#include <time.h>
+
 /* need _BSD_SOURCE to get timersub macros */
 
 #ifdef _BSD_SOURCE
@@ -31,7 +33,6 @@
 #endif
 
 #include <list>
-
 #include <cmath>
 
 #include <libgnomecanvasmm/canvas.h>
@@ -655,6 +656,19 @@ class ARDOUR_UI : public Gtkmm2ext::UI
 	ARDOUR::microseconds_t last_peak_grab;
 	ARDOUR::microseconds_t last_shuttle_request;
 
+	struct DiskBufferStat {
+	    time_t when;
+	    uint32_t capture;
+	    uint32_t playback;
+
+	    DiskBufferStat (time_t w, uint32_t c, uint32_t p) 
+	    : when (w), capture (c), playback (p) {}
+	};
+	
+	std::list<DiskBufferStat> disk_buffer_stats;
+	void push_buffer_stats (uint32_t, uint32_t);
+	void write_buffer_stats ();
+
 	bool have_disk_speed_dialog_displayed;
 	void disk_speed_dialog_gone (int ignored_response, Gtk::MessageDialog*);
 	void disk_overrun_handler ();