add VU and IEC meter DSP (from jmeters)

1 files changed, 51 insertions, 0 deletions

diff --git a/libs/ardour/ardour/iec1ppmdsp.h b/libs/ardour/ardour/iec1ppmdsp.h
new file mode 100644
index 0000000000..58dea97555
--- /dev/null
+++ b/libs/ardour/ardour/iec1ppmdsp.h
@@ -0,0 +1,51 @@
+/*
+    Copyright (C) 2012 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 __IEC1PPMDSP_H
+#define	__IEC1PPMDSP_H
+
+
+class Iec1ppmdsp
+{
+public:
+
+    Iec1ppmdsp (void);
+    ~Iec1ppmdsp (void);
+
+    void process (float *p, int n);  
+    float read (void);
+    void reset ();
+
+    static void init (float fsamp); 
+
+private:
+
+    float          _z1;          // filter state
+    float          _z2;          // filter state
+    float          _m;           // max value since last read()
+    bool           _res;         // flag to reset m
+
+    static float   _w1;          // attack filter coefficient
+    static float   _w2;          // attack filter coefficient
+    static float   _w3;          // release filter coefficient
+    static float   _g;           // gain factor
+};
+
+
+#endif