296 lines
8.4 KiB
C++
296 lines
8.4 KiB
C++
/*
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Copyright (C) 2000 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 __ardour_tempo_h__
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#define __ardour_tempo_h__
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#include <list>
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#include <string>
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#include <vector>
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#include <cmath>
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#include <glibmm/thread.h>
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#include "pbd/undo.h"
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#include "pbd/stateful.h"
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#include "pbd/statefuldestructible.h"
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#include "ardour/ardour.h"
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class XMLNode;
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namespace ARDOUR {
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class Meter;
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class Tempo {
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public:
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Tempo (double bpm, double type=4.0) // defaulting to quarter note
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: _beats_per_minute (bpm), _note_type(type) {}
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double beats_per_minute () const { return _beats_per_minute;}
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double note_type () const { return _note_type;}
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double frames_per_beat (nframes_t sr, const Meter& meter) const;
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protected:
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double _beats_per_minute;
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double _note_type;
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};
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class Meter {
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public:
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static const double ticks_per_beat;
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Meter (double bpb, double bt)
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: _beats_per_bar (bpb), _note_type (bt) {}
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double beats_per_bar () const { return _beats_per_bar; }
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double note_divisor() const { return _note_type; }
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double frames_per_bar (const Tempo&, nframes_t sr) const;
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protected:
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/** The number of beats in a bar. This is a real value because
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there are musical traditions on our planet that do not limit
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themselves to integral numbers of beats per bar.
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*/
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double _beats_per_bar;
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/** The type of "note" that a beat represents. For example, 4.0 is
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a quarter (crotchet) note, 8.0 is an eighth (quaver) note, etc.
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*/
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double _note_type;
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};
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class MetricSection {
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public:
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MetricSection (const BBT_Time& start)
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: _start (start), _frame (0), _movable (true) {}
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MetricSection (nframes64_t start)
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: _frame (start), _movable (true) {}
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virtual ~MetricSection() {}
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const BBT_Time& start() const { return _start; }
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nframes64_t frame() const { return _frame; }
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void set_movable (bool yn) { _movable = yn; }
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bool movable() const { return _movable; }
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virtual void set_frame (nframes64_t f) {
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_frame = f;
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}
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virtual void set_start (const BBT_Time& w) {
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_start = w;
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}
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/* MeterSections are not stateful in the full sense,
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but we do want them to control their own
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XML state information.
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*/
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virtual XMLNode& get_state() const = 0;
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private:
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BBT_Time _start;
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nframes64_t _frame;
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bool _movable;
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};
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class MeterSection : public MetricSection, public Meter {
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public:
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MeterSection (const BBT_Time& start, double bpb, double note_type)
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: MetricSection (start), Meter (bpb, note_type) {}
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MeterSection (nframes64_t start, double bpb, double note_type)
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: MetricSection (start), Meter (bpb, note_type) {}
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MeterSection (const XMLNode&);
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static const std::string xml_state_node_name;
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XMLNode& get_state() const;
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};
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class TempoSection : public MetricSection, public Tempo {
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public:
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TempoSection (const BBT_Time& start, double qpm, double note_type)
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: MetricSection (start), Tempo (qpm, note_type) {}
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TempoSection (nframes64_t start, double qpm, double note_type)
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: MetricSection (start), Tempo (qpm, note_type) {}
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TempoSection (const XMLNode&);
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static const std::string xml_state_node_name;
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XMLNode& get_state() const;
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};
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typedef std::list<MetricSection*> Metrics;
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/** Helper class that we use to be able to keep track of which
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meter *AND* tempo are in effect at a given point in time.
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*/
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class TempoMetric {
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public:
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TempoMetric (const Meter& m, const Tempo& t) : _meter (&m), _tempo (&t), _frame (0) {}
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void set_tempo (const Tempo& t) { _tempo = &t; }
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void set_meter (const Meter& m) { _meter = &m; }
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void set_frame (nframes64_t f) { _frame = f; }
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void set_start (const BBT_Time& t) { _start = t; }
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const Meter& meter() const { return *_meter; }
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const Tempo& tempo() const { return *_tempo; }
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nframes64_t frame() const { return _frame; }
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const BBT_Time& start() const { return _start; }
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private:
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const Meter* _meter;
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const Tempo* _tempo;
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nframes64_t _frame;
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BBT_Time _start;
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};
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class TempoMap : public PBD::StatefulDestructible
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{
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public:
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TempoMap (nframes64_t frame_rate);
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~TempoMap();
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/* measure-based stuff */
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enum BBTPointType {
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Bar,
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Beat,
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};
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struct BBTPoint {
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BBTPointType type;
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nframes64_t frame;
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const Meter* meter;
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const Tempo* tempo;
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uint32_t bar;
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uint32_t beat;
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BBTPoint (const Meter& m, const Tempo& t, nframes64_t f,
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BBTPointType ty, uint32_t b, uint32_t e)
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: type (ty), frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
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};
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typedef std::vector<BBTPoint> BBTPointList;
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template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
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Glib::RWLock::ReaderLock lm (lock);
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(obj.*method)(*metrics);
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}
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BBTPointList *get_points (nframes64_t start, nframes64_t end) const;
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void bbt_time (nframes64_t when, BBT_Time&) const;
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nframes64_t frame_time (const BBT_Time&) const;
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nframes64_t bbt_duration_at (nframes64_t, const BBT_Time&, int dir) const;
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void bbt_time_add (nframes64_t origin, BBT_Time& start, const BBT_Time& shift);
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static const Tempo& default_tempo() { return _default_tempo; }
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static const Meter& default_meter() { return _default_meter; }
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const Tempo& tempo_at (nframes64_t) const;
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const Meter& meter_at (nframes64_t) const;
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const TempoSection& tempo_section_at (nframes64_t);
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void add_tempo(const Tempo&, BBT_Time where);
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void add_meter(const Meter&, BBT_Time where);
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void add_tempo(const Tempo&, nframes64_t where);
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void add_meter(const Meter&, nframes64_t where);
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void move_tempo (TempoSection&, const BBT_Time& to);
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void move_meter (MeterSection&, const BBT_Time& to);
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void remove_tempo(const TempoSection&);
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void remove_meter(const MeterSection&);
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void replace_tempo (TempoSection& existing, const Tempo& replacement);
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void replace_meter (MeterSection& existing, const Meter& replacement);
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nframes64_t round_to_bar (nframes64_t frame, int dir);
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nframes64_t round_to_beat (nframes64_t frame, int dir);
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nframes64_t round_to_beat_subdivision (nframes64_t fr, int sub_num, int dir);
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nframes64_t round_to_tick (nframes64_t frame, int dir);
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void set_length (nframes64_t frames);
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XMLNode& get_state (void);
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int set_state (const XMLNode&, int version);
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void dump (std::ostream&) const;
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void clear ();
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TempoMetric metric_at (BBT_Time bbt) const;
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TempoMetric metric_at (nframes64_t) const;
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void bbt_time_with_metric (nframes64_t, BBT_Time&, const TempoMetric&) const;
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BBT_Time bbt_add (const BBT_Time&, const BBT_Time&, const TempoMetric&) const;
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BBT_Time bbt_add (const BBT_Time& a, const BBT_Time& b) const;
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BBT_Time bbt_subtract (const BBT_Time&, const BBT_Time&) const;
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void change_existing_tempo_at (nframes64_t, double bpm, double note_type);
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void change_initial_tempo (double bpm, double note_type);
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void insert_time (nframes64_t, nframes64_t);
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int n_tempos () const;
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int n_meters () const;
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nframes_t frame_rate () const { return _frame_rate; }
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private:
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static Tempo _default_tempo;
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static Meter _default_meter;
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Metrics* metrics;
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nframes_t _frame_rate;
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nframes64_t last_bbt_when;
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bool last_bbt_valid;
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BBT_Time last_bbt;
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mutable Glib::RWLock lock;
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void timestamp_metrics (bool use_bbt);
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nframes64_t round_to_type (nframes64_t fr, int dir, BBTPointType);
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nframes64_t frame_time_unlocked (const BBT_Time&) const;
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void bbt_time_unlocked (nframes64_t, BBT_Time&) const;
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nframes64_t bbt_duration_at_unlocked (const BBT_Time& when, const BBT_Time& bbt, int dir) const;
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const MeterSection& first_meter() const;
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const TempoSection& first_tempo() const;
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nframes64_t count_frames_between (const BBT_Time&, const BBT_Time&) const;
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nframes64_t count_frames_between_metrics (const Meter&, const Tempo&,
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const BBT_Time&, const BBT_Time&) const;
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int move_metric_section (MetricSection&, const BBT_Time& to);
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void do_insert (MetricSection* section, bool with_bbt);
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};
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}; /* namespace ARDOUR */
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#endif /* __ardour_tempo_h__ */
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