experimental RMS-meter and peak-signal (vs peak-power) query

1 files changed, 45 insertions, 0 deletions

diff --git a/libs/ardour/kmeterdsp.h b/libs/ardour/kmeterdsp.h
new file mode 100644
index 0000000000..9c2309e09c
--- /dev/null
+++ b/libs/ardour/kmeterdsp.h
@@ -0,0 +1,45 @@
+/*
+    Copyright (C) 2008-2011 Fons Adriaensen <fons@linuxaudio.org>
+		Adopted for Ardour 2013 by 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 __KMETERDSP_H
+#define	__KMETERDSP_H
+
+class Kmeterdsp
+{
+public:
+
+    Kmeterdsp (void);
+    ~Kmeterdsp (void);
+
+    void process (float *p, int n);
+    float read ();
+    static void init (int fsamp);
+    void reset ();
+
+private:
+
+    float          _z1;          // filter state
+    float          _z2;          // filter state
+    float          _rms;         // max rms value since last read()
+    bool           _flag;        // flag set by read(), resets _rms
+
+    static float   _omega;       // ballistics filter constant.
+};
+
+#endif