2010-12-14 15:28:37 -05:00
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/*
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Copyright (C) 2002-2010 Paul Davis
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <cmath>
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2011-04-22 20:02:58 -04:00
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#include <cassert>
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2010-12-14 15:28:37 -05:00
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#include "timecode/bbt_time.h"
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using namespace Timecode;
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2011-12-19 14:44:43 -05:00
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/* This number doesn't describe the smallest division of a "beat" (which is
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only defined contextually anyway), but rather the smallest division of the the
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divisions of a bar. If using a meter of 4/8, there are 4 divisions per bar, and
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we can divide each one into ticks_per_bar_division pieces; in a separate meter
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(section) of 3/8, there are 3 divisions per bar, each of which can be divided
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into ticks_per_bar_division pieces.
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The number is intended to have as many integer factors as possible so that
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1/Nth divisions are integer numbers of ticks.
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1920 is the largest legal value that be used inside an SMF file, and has many factors.
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*/
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const double BBT_Time::ticks_per_bar_division = 1920.0;
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2010-12-14 15:28:37 -05:00
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2010-12-14 22:03:30 -05:00
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BBT_Time::BBT_Time (double dbeats)
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2010-12-14 15:28:37 -05:00
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{
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/* NOTE: this does not construct a BBT time in a canonical form,
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in that beats may be a very large number, and bars will
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always be zero.
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*/
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2011-04-22 20:02:58 -04:00
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assert (dbeats >= 0);
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2010-12-14 15:28:37 -05:00
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bars = 0;
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2010-12-14 22:03:30 -05:00
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beats = rint (floor (dbeats));
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2011-12-19 14:44:43 -05:00
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ticks = rint (floor (BBT_Time::ticks_per_bar_division * fmod (dbeats, 1.0)));
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2010-12-14 15:28:37 -05:00
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}
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