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extend/fix/improve operator overloads and methods for Timecode::BBT_Time

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This commit is contained in:
Paul Davis 2017-09-13 17:12:51 -04:00
parent 9ea43bd5ad
commit 176cdecd03
2 changed files with 56 additions and 11 deletions
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6
libs/timecode/src/bbt_time.cc
View file

@ -29,15 +29,17 @@ using namespace Timecode;
1/Nth divisions are integer numbers of ticks.
1920 has many factors, though going up to 3840 gets a couple more.
This needs to match Evoral::Beats::PPQN
*/
const double BBT_Time::ticks_per_beat = 1920.0;
BBT_Time::BBT_Time (double dbeats)
BBT_Offset::BBT_Offset (double dbeats)
{
/* NOTE: this does not construct a BBT time in a canonical form,
in that beats may be a very large number, and bars will
always be zero.
always be zero. Hence ... it's a BBT_Offset
*/
assert (dbeats >= 0);

61
libs/timecode/timecode/bbt_time.h
View file

@ -22,26 +22,31 @@
#include <ostream>
#include <stdint.h>
#include <iomanip>
#include <exception>
#include "timecode/visibility.h"
namespace Timecode {
/** Bar, Beat, Tick Time (i.e. Tempo-Based Time) */
struct LIBTIMECODE_API BBT_Time {
struct LIBTIMECODE_API BBT_Time
{
static const double ticks_per_beat;
uint32_t bars;
uint32_t beats;
uint32_t ticks;
/* note that it is illegal for BBT_Time to have bars==0 or
* beats==0. The "neutral" or "default" value is 1|1|0
*/
BBT_Time ()
: bars (1), beats (1), ticks (0) {}
int32_t bars;
int32_t beats;
int32_t ticks;
BBT_Time (uint32_t ba, uint32_t be, uint32_t t)
: bars (ba), beats (be), ticks (t) {}
struct IllegalBBTTimeException : public std::exception {
virtual const char* what() const throw() { return "illegal BBT time (bars or beats were zero)"; }
};
BBT_Time (double beats);
BBT_Time () : bars (1), beats (1), ticks (0) {}
BBT_Time (int32_t ba, uint32_t be, uint32_t t) : bars (ba), beats (be), ticks (t) { if (!bars || !beats) { throw IllegalBBTTimeException(); } }
bool operator< (const BBT_Time& other) const {
return bars < other.bars ||
@ -74,6 +79,37 @@ struct LIBTIMECODE_API BBT_Time {
bool operator!= (const BBT_Time& other) const {
return bars != other.bars || beats != other.beats || ticks != other.ticks;
}
/* it would be nice to provide operator+(BBT_Time const&) and
* operator-(BBT_Time const&) but this math requires knowledge of the
* meter (time signature) used to define 1 bar, and so cannot be
* carried out with only two BBT_Time values.
*/
BBT_Time round_to_beat () const { return ticks >= (ticks_per_beat/2) ? BBT_Time (bars, beats+1, 0) : BBT_Time (bars, beats, 0); }
BBT_Time round_down_to_beat () const { return BBT_Time (bars, beats, 0); }
BBT_Time round_up_to_beat () const { return ticks ? BBT_Time (bars, beats+1, 0) : *this; }
/* cannot implement round_to_bar() without knowing meter (time
* signature) information.
*/
};
struct LIBTIMECODE_API BBT_Offset
{
int32_t bars;
int32_t beats;
int32_t ticks;
/* this is a variant for which bars==0 and/or beats==0 is legal. It
* represents an offset from a given BBT_Time and is used when doing
* add/subtract operations on a BBT_Time.
*/
BBT_Offset () : bars (0), beats (0), ticks (0) {}
BBT_Offset (int32_t ba, uint32_t be, uint32_t t) : bars (ba), beats (be), ticks (t) {}
BBT_Offset (BBT_Time const & bbt) : bars (bbt.bars), beats (bbt.beats), ticks (bbt.ticks) {}
BBT_Offset (double beats);
};
}
@ -85,6 +121,13 @@ operator<< (std::ostream& o, const Timecode::BBT_Time& bbt)
return o;
}
inline std::ostream&
operator<< (std::ostream& o, const Timecode::BBT_Offset& bbt)
{
o << bbt.bars << '|' << bbt.beats << '|' << bbt.ticks;
return o;
}
inline std::ostream&
print_padded (std::ostream& o, const Timecode::BBT_Time& bbt)
{