RAUL: Quantizer.hpp Source File

00001 /* This file is part of Raul.
00002  * Copyright (C) 2007-2009 David Robillard <http://drobilla.net>
00003  *
00004  * Raul is free software; you can redistribute it and/or modify it under the
00005  * terms of the GNU General Public License as published by the Free Software
00006  * Foundation; either version 2 of the License, or (at your option) any later
00007  * version.
00008  *
00009  * Raul is distributed in the hope that it will be useful, but WITHOUT ANY
00010  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00011  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
00012  *
00013  * You should have received a copy of the GNU General Public License along
00014  * with this program; if not, write to the Free Software Foundation, Inc.,
00015  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
00016  */
00017 
00018 #ifndef RAUL_QUANTIZER_HPP
00019 #define RAUL_QUANTIZER_HPP
00020 
00021 #include <cmath>
00022 #include "raul/TimeStamp.hpp"
00023 
00024 namespace Raul {
00025 
00029 class Quantizer {
00030 public:
00031     inline static TimeStamp quantize(TimeStamp q, TimeStamp t) {
00032         assert(q.unit() == t.unit());
00033         // FIXME: Precision problem?  Should probably stay in discrete domain
00034         const double qd = q.to_double();
00035         const double td = t.to_double();
00036         return TimeStamp(t.unit(), (qd > 0) ? lrint(td / qd) * qd : td);
00037     }
00038 
00039     inline static double quantize(double q, double t) {
00040         return (q > 0)
00041             ? lrint(t / q) * q
00042             : t;
00043     }
00044 };
00045 
00046 
00047 } // namespace Raul
00048 
00049 #endif // RAUL_QUANTIZER_HPP