82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/*
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* Copyright (C) 2009-2014 David Robillard <d@drobilla.net>
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* Copyright (C) 2010-2012 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2011-2014 Paul Davis <paul@linuxaudiosystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef EVORAL_TIME_CONVERTER_HPP
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#define EVORAL_TIME_CONVERTER_HPP
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#include "evoral/visibility.h"
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namespace Evoral {
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/** A bidirectional converter between two different time units.
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*
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* Think of the conversion method names as if they are written in-between
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* the two template parameters (i.e. "A <name> B").
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*
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* _origin_b should be the origin for conversion in the units of B.
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* That is, there is some point in time _origin_b, such that:
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*
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* to() converts a time _origin_b + a into an offset from _origin_b in units of B.
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* from() converts a time _origin_b + b into an offset from _origin_b in units of A.
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*/
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template<typename A, typename B>
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class LIBEVORAL_TEMPLATE_API TimeConverter {
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public:
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TimeConverter () : _origin_b (0) {}
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TimeConverter (B ob) : _origin_b (ob) {}
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virtual ~TimeConverter();
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/** Convert A time to B time (A to B) */
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virtual B to(A a) const = 0;
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/** Convert B time to A time (A from B) */
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virtual A from(B b) const = 0;
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B origin_b () const {
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return _origin_b;
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}
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void set_origin_b (B o) {
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_origin_b = o;
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}
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protected:
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B _origin_b;
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};
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/** A stub TimeConverter that simple statically casts between types.
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* _origin_b has no bearing here, as there is no time conversion
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* going on.
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*/
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template<typename A, typename B>
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class LIBEVORAL_TEMPLATE_API IdentityConverter : public TimeConverter<A,B> {
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public:
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IdentityConverter() {}
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B to(A a) const;
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A from(B b) const;
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};
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} // namespace Evoral
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#endif // EVORAL_TIME_CONVERTER_HPP
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