prepare MIDI latency measurement (backend)

1 files changed, 62 insertions, 0 deletions

diff --git a/libs/ardour/ardour/mididm.h b/libs/ardour/ardour/mididm.h
new file mode 100644
index 0000000000..7c7211300c
--- /dev/null
+++ b/libs/ardour/ardour/mididm.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2013-2014 Robin Gareus <robin@gareus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __libardour_mididm_h__
+#define __libardour_mididm_h__
+
+#include "ardour/types.h"
+#include "ardour/libardour_visibility.h"
+
+namespace ARDOUR {
+
+class PortEngine;
+
+class LIBARDOUR_API MIDIDM
+{
+public:
+
+	MIDIDM (framecnt_t sample_rate);
+
+	int process (pframes_t nframes, PortEngine &pe, void *midi_in, void *midi_out);
+
+	framecnt_t latency (void) { return _cnt_total > 10 ? _avg_delay : 0; }
+	framecnt_t processed (void) { return _cnt_total; }
+	double     deviation (void) { return _cnt_total > 1 ? sqrt(_var_s / ((double)(_cnt_total - 1))) : 0; }
+	bool       ok (void) { return _cnt_total > 200; }
+	bool       have_signal (void) { return (_monotonic_cnt - _last_signal_tme) < (uint64_t) _sample_rate ; }
+
+private:
+
+	framecnt_t _sample_rate;
+
+	uint64_t _monotonic_cnt;
+	uint64_t _last_signal_tme;
+
+	uint64_t _cnt_total;
+	uint64_t _dly_total;
+	uint32_t _min_delay;
+	uint32_t _max_delay;
+	double   _avg_delay;
+	double   _var_m;
+	double   _var_s;
+
+};
+
+}
+
+#endif /* __libardour_mididm_h__ */