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doomclassic/timidity/filter.h

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+/*
+
+TiMidity -- Experimental MIDI to WAVE converter
+Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
+
+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.
+
+filter.h : written by Vincent Pagel ( pagel@loria.fr )
+
+implements fir antialiasing filter : should help when setting sample
+rates as low as 8Khz.
+
+*/
+
+/* Order of the FIR filter = 20 should be enough ! */
+#define ORDER 20
+#define ORDER2 ORDER/2
+
+#ifndef PI
+extern const float PI;
+#endif
+
+extern void antialiasing(Sample *sp,  int32_t  output_rate);