temporal: drop old tempo-experiment.h
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Mads Kiilerich
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/*
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Copyright (C) 2020 Paul Davis
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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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __libtemporal_tempo_h__
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#define __libtemporal_tempo_h__
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#include <cassert>
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#include <cmath>
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#include <exception>
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#include <limits>
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#include <ostream>
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#include <string>
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#include "pbd/enumwriter.h"
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#include "pbd/integer_division.h"
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#include "temporal/beats.h"
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#include "temporal/types.h"
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#include "temporal/superclock.h"
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#include "temporal/visibility.h"
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/************************* !!!! ATTENTION !!!! *************************
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NO FLOATING POINT ARITHMETIC IS ALLOWED IN THIS HEADER OR
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ANY OF THE OBJECTS DEFINED HERE.
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Exceptions:
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1) constructors/methods that accept double from the user
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2) clearly labelled methods that warn a developer to avoid
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their use or use them only for display purposes.
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************************************************************************/
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namespace Temporal {
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class TempoValue {
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private:
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/* beats per minute * big_numerator => rational number expressing (possibly fractional) bpm as superbeats-per-minute
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*
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* It is not required that big_numerator equal superclock_ticks_per_second but since the values in both cases have similar
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* desired properties (many, many factors), it doesn't hurt to use the same number.
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*/
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static const superclock_t big_numerator = superclock_ticks_per_second;
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public:
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TempoValue (double bpm) : val (bpm) {
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/* since we allow the user to provide bpm as a floating point value,
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we allow use of floating point math to determine the two critical
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integer values (superbeats-per-second and superclocks-per-beat
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*/
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_sbps = (superclock_t) llround (bpm * (big_numerator / 60));
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_scpb = (superclock_t) llround ((60./ bpm) * superclock_ticks_per_second);
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}
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double given_bpm_for_display_only () const { return val; }
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double actual_bpm_for_display_only () const { return (_sbps * 60) / (double) big_numerator; }
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uint64_t ticks_per_second() const { return int_div_round ((_sbps * Temporal::ticks_per_beat), big_numerator); }
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superclock_t superclocks_per_beat() const { return _scpb; }
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Temporal::Beats superclocks_as_beats (superclock_t sc) const {
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/* convert sc into superbeats, given that sc represents some number of seconds */
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const superclock_t whole_seconds = sc / superclock_ticks_per_second;
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const superclock_t remainder = sc - (whole_seconds * superclock_ticks_per_second);
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const superclock_t superbeats = (_sbps * whole_seconds) + int_div_round ((_sbps * remainder), superclock_ticks_per_second);
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/* convert superbeats to beats:ticks */
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uint32_t b = superbeats / big_numerator;
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const uint64_t remain = superbeats - (b * big_numerator);
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uint32_t t = int_div_round ((Temporal::ticks_per_beat * remain), big_numerator);
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return Beats (b, t);
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}
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superclock_t beats_as_superclocks (Temporal::Beats const & b) const {
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/* no symmetrical with superclocks_as_beats() because Beats already breaks apart the beats:ticks,
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with the ticks value denominated by Temporal::ticks_per_beat
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*/
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return (_scpb * b.get_beats()) + int_div_round ((_scpb * b.get_ticks()), superclock_t (Temporal::ticks_per_beat));
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}
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Temporal::Beats seconds_as_beats (uint64_t num, uint64_t denom) const {
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return superclocks_as_beats ((num * superclock_ticks_per_second) / denom);
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}
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double beats_as_float_seconds_avoid_me (Temporal::Beats const & b) const {
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return beats_as_superclocks (b) / (double) superclock_ticks_per_second;
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}
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private:
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double val; /* as given to constructor */
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uint64_t _sbps; /* superbeats-per-second */
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superclock_t _scpb; /* superclocks-per-beat */
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};
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inline std::ostream&
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operator<<(std::ostream& os, const TempoValue& v)
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{
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os << v.actual_bpm_for_display_only ();
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return os;
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}
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inline std::istream&
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operator>>(std::istream& istr, TempoValue& v)
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{
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#if 0
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uint16_t w;
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uint64_t f;
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char d; /* delimiter, whatever it is */
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istr >> w >> d >> f;
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v = TempoValue (w, f);
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#endif
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return istr;
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}
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} /* namespace Temporal */
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#endif /* __libtemporal_tempo_h__ */
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