143 lines
4.4 KiB
C++
143 lines
4.4 KiB
C++
/*
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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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#ifndef __timecode_bbt_time_h__
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#define __timecode_bbt_time_h__
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#include <ostream>
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#include <stdint.h>
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#include <iomanip>
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#include <exception>
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#include "temporal/visibility.h"
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namespace Timecode {
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/** Bar, Beat, Tick Time (i.e. Tempo-Based Time) */
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struct LIBTEMPORAL_API BBT_Time
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{
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static const double ticks_per_beat;
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/* note that it is illegal for BBT_Time to have bars==0 or
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* beats==0. The "neutral" or "default" value is 1|1|0
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*/
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int32_t bars;
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int32_t beats;
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int32_t ticks;
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struct IllegalBBTTimeException : public std::exception {
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virtual const char* what() const throw() { return "illegal BBT time (bars or beats were zero)"; }
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};
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BBT_Time () : bars (1), beats (1), ticks (0) {}
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BBT_Time (int32_t ba, uint32_t be, uint32_t t) : bars (ba), beats (be), ticks (t) { if (!bars || !beats) { throw IllegalBBTTimeException(); } }
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bool operator< (const BBT_Time& other) const {
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return bars < other.bars ||
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(bars == other.bars && beats < other.beats) ||
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(bars == other.bars && beats == other.beats && ticks < other.ticks);
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}
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bool operator<= (const BBT_Time& other) const {
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return bars < other.bars ||
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(bars <= other.bars && beats <= other.beats) ||
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(bars <= other.bars && beats <= other.beats && ticks <= other.ticks);
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}
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bool operator> (const BBT_Time& other) const {
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return bars > other.bars ||
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(bars == other.bars && beats > other.beats) ||
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(bars == other.bars && beats == other.beats && ticks > other.ticks);
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}
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bool operator>= (const BBT_Time& other) const {
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return bars > other.bars ||
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(bars >= other.bars && beats >= other.beats) ||
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(bars >= other.bars && beats >= other.beats && ticks >= other.ticks);
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}
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bool operator== (const BBT_Time& other) const {
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return bars == other.bars && beats == other.beats && ticks == other.ticks;
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}
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bool operator!= (const BBT_Time& other) const {
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return bars != other.bars || beats != other.beats || ticks != other.ticks;
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}
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/* it would be nice to provide operator+(BBT_Time const&) and
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* operator-(BBT_Time const&) but this math requires knowledge of the
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* meter (time signature) used to define 1 bar, and so cannot be
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* carried out with only two BBT_Time values.
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*/
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BBT_Time round_to_beat () const { return ticks >= (ticks_per_beat/2) ? BBT_Time (bars, beats+1, 0) : BBT_Time (bars, beats, 0); }
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BBT_Time round_down_to_beat () const { return BBT_Time (bars, beats, 0); }
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BBT_Time round_up_to_beat () const { return ticks ? BBT_Time (bars, beats+1, 0) : *this; }
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/* cannot implement round_to_bar() without knowing meter (time
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* signature) information.
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*/
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};
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struct LIBTEMPORAL_API BBT_Offset
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{
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int32_t bars;
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int32_t beats;
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int32_t ticks;
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/* this is a variant for which bars==0 and/or beats==0 is legal. It
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* represents an offset from a given BBT_Time and is used when doing
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* add/subtract operations on a BBT_Time.
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*/
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BBT_Offset () : bars (0), beats (0), ticks (0) {}
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BBT_Offset (int32_t ba, uint32_t be, uint32_t t) : bars (ba), beats (be), ticks (t) {}
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BBT_Offset (BBT_Time const & bbt) : bars (bbt.bars), beats (bbt.beats), ticks (bbt.ticks) {}
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BBT_Offset (double beats);
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};
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}
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inline std::ostream&
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operator<< (std::ostream& o, const Timecode::BBT_Time& bbt)
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{
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o << bbt.bars << '|' << bbt.beats << '|' << bbt.ticks;
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return o;
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}
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inline std::ostream&
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operator<< (std::ostream& o, const Timecode::BBT_Offset& bbt)
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{
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o << bbt.bars << '|' << bbt.beats << '|' << bbt.ticks;
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return o;
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}
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inline std::ostream&
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print_padded (std::ostream& o, const Timecode::BBT_Time& bbt)
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{
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o << std::setfill ('0') << std::right
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<< std::setw (3) << bbt.bars << "|"
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<< std::setw (2) << bbt.beats << "|"
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<< std::setw (4) << bbt.ticks;
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return o;
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}
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#endif /* __timecode_bbt_time_h__ */
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