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-rw-r--r--src/engine/Quantizer.hpp47
-rw-r--r--src/engine/quantize_test.cpp40
2 files changed, 87 insertions, 0 deletions
diff --git a/src/engine/Quantizer.hpp b/src/engine/Quantizer.hpp
new file mode 100644
index 0000000..078f5e2
--- /dev/null
+++ b/src/engine/Quantizer.hpp
@@ -0,0 +1,47 @@
+/*
+ This file is part of Raul.
+ Copyright 2007-2012 David Robillard <http://drobilla.net>
+
+ Raul 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 3 of the License, or any later version.
+
+ Raul 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 Raul. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef RAUL_QUANTIZER_HPP
+#define RAUL_QUANTIZER_HPP
+
+#include <cmath>
+#include "raul/TimeStamp.hpp"
+
+namespace Raul {
+
+/** Quantizer.
+ * \ingroup raul
+ */
+class Quantizer {
+public:
+ inline static TimeStamp quantize(TimeStamp q, TimeStamp t) {
+ assert(q.unit() == t.unit());
+ // FIXME: Precision problem? Should probably stay in discrete domain
+ const double qd = q.to_double();
+ const double td = t.to_double();
+ return TimeStamp(t.unit(), (qd > 0) ? lrint(td / qd) * qd : td);
+ }
+
+ inline static double quantize(double q, double t) {
+ return (q > 0)
+ ? lrint(t / q) * q
+ : t;
+ }
+};
+
+} // namespace Raul
+
+#endif // RAUL_QUANTIZER_HPP
diff --git a/src/engine/quantize_test.cpp b/src/engine/quantize_test.cpp
new file mode 100644
index 0000000..9cc165d
--- /dev/null
+++ b/src/engine/quantize_test.cpp
@@ -0,0 +1,40 @@
+/*
+ This file is part of Raul.
+ Copyright 2007-2012 David Robillard <http://drobilla.net>
+
+ Raul 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 3 of the License, or any later version.
+
+ Raul 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 Raul. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "raul/Quantizer.hpp"
+#include <iostream>
+
+using namespace std;
+using namespace Raul;
+
+int
+main()
+{
+ TimeStamp q(TimeUnit(TimeUnit::BEATS, 19200), 0.25);
+
+ for (double in = 0.0; in < 32; in += 0.23) {
+ TimeStamp beats(TimeUnit(TimeUnit::BEATS, 19200), in);
+
+ /*cout << "Q(" << in << ", 1/4) = "
+ << Quantizer::quantize(q, beats) << endl;*/
+
+ if (Quantizer::quantize(q, beats).subticks() % (19200/4) != 0)
+ return 1;
+ }
+
+ return 0;
+}
+