1 files changed, 59 insertions, 0 deletions
diff --git a/apps/dither.h b/apps/dither.h
new file mode 100644
index 0000000..d03ca8c
--- /dev/null
+++ b/apps/dither.h
@@ -0,0 +1,59 @@
+// -------------------------------------------------------------------------
+//
+//    Copyright (C) 2010-2014 Fons Adriaensen <fons@linuxaudio.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 __DITHER_H
+#define __DITHER_H
+
+
+#include <stdint.h>
+
+
+class Dither
+{
+public:
+
+    Dither (void);
+    void reset (void);
+    void proc_rectangular (int nsam, const float *srce, int16_t *dest, int ds, int dd);
+    void proc_triangular  (int nsam, const float *srce, int16_t *dest, int ds, int dd);
+    void proc_lipschitz   (int nsam, const float *srce, int16_t *dest, int ds, int dd); 
+
+private:
+
+    enum { SIZE = 64 };
+
+    float genrand (void)
+    {
+        _ran *= 1103515245;
+        _ran += 12345;
+	return _ran / _div;
+    }
+
+    float    _err [SIZE + 4];
+    int      _ind;
+    uint32_t _ran;
+
+    static float _div;
+};
+
+
+#endif
+