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rename Timecode::BBT_Time::ticks_per_beat to Timecode::BBT_Time::ticks_per_bar_division which is a more accurate and informative name. The number doesn't describe the smallest division of a "beat" (which is only defined contextually anyway), but rather the smallest division of the the divisions of a bar. If using a meter of 4/8, there are 4 divisions per bar, and we can divide each one into ticks_per_bar_division pieces; in a separate meter (section) of 3/8, there are 3 divisions per bar, each of which can be divided into ticks_per_bar_division_pieces.

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git-svn-id: svn://localhost/ardour2/branches/3.0@11022 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Paul Davis 2011-12-19 19:44:43 +00:00
parent ca9a444aa9
commit e9b4f14668
12 changed files with 60 additions and 47 deletions
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17
libs/timecode/src/bbt_time.cc
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@ -23,7 +23,20 @@
using namespace Timecode;
const double BBT_Time::ticks_per_beat = 1920.0;
/* This number doesn't describe the smallest division of a "beat" (which is
only defined contextually anyway), but rather the smallest division of the the
divisions of a bar. If using a meter of 4/8, there are 4 divisions per bar, and
we can divide each one into ticks_per_bar_division pieces; in a separate meter
(section) of 3/8, there are 3 divisions per bar, each of which can be divided
into ticks_per_bar_division pieces.
The number is intended to have as many integer factors as possible so that
1/Nth divisions are integer numbers of ticks.
1920 is the largest legal value that be used inside an SMF file, and has many factors.
*/
const double BBT_Time::ticks_per_bar_division = 1920.0;
BBT_Time::BBT_Time (double dbeats)
{
@ -36,5 +49,5 @@ BBT_Time::BBT_Time (double dbeats)
bars = 0;
beats = rint (floor (dbeats));
ticks = rint (floor (BBT_Time::ticks_per_beat * fmod (dbeats, 1.0)));
ticks = rint (floor (BBT_Time::ticks_per_bar_division * fmod (dbeats, 1.0)));
}