2 Copyright (C) 2000 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __ardour_tempo_h__
21 #define __ardour_tempo_h__
27 #include <glibmm/thread.h>
30 #include "pbd/stateful.h"
31 #include "pbd/statefuldestructible.h"
33 #include "evoral/types.hpp"
35 #include "ardour/ardour.h"
43 Tempo (double bpm, double type=4.0) // defaulting to quarter note
44 : _beats_per_minute (bpm), _note_type(type) {}
46 double beats_per_minute () const { return _beats_per_minute;}
47 double note_type () const { return _note_type;}
48 double frames_per_beat (framecnt_t sr, const Meter& meter) const;
51 double _beats_per_minute;
57 Meter (double bpb, double bt)
58 : _beats_per_bar (bpb), _note_type (bt) {}
60 double beats_per_bar () const { return _beats_per_bar; }
61 double note_divisor() const { return _note_type; }
63 double frames_per_bar (const Tempo&, framecnt_t sr) const;
66 /** The number of beats in a bar. This is a real value because
67 there are musical traditions on our planet that do not limit
68 themselves to integral numbers of beats per bar.
70 double _beats_per_bar;
72 /** The type of "note" that a beat represents. For example, 4.0 is
73 a quarter (crotchet) note, 8.0 is an eighth (quaver) note, etc.
80 MetricSection (const Timecode::BBT_Time& start)
81 : _start (start), _frame (0), _movable (true) {}
82 MetricSection (framepos_t start)
83 : _frame (start), _movable (true) {}
85 virtual ~MetricSection() {}
87 const Timecode::BBT_Time& start() const { return _start; }
88 framepos_t frame() const { return _frame; }
90 void set_movable (bool yn) { _movable = yn; }
91 bool movable() const { return _movable; }
93 virtual void set_frame (framepos_t f) {
97 virtual void set_start (const Timecode::BBT_Time& w) {
101 /* MeterSections are not stateful in the full sense,
102 but we do want them to control their own
103 XML state information.
105 virtual XMLNode& get_state() const = 0;
107 int compare (MetricSection *, bool) const;
110 Timecode::BBT_Time _start;
115 class MeterSection : public MetricSection, public Meter {
117 MeterSection (const Timecode::BBT_Time& start, double bpb, double note_type)
118 : MetricSection (start), Meter (bpb, note_type) {}
119 MeterSection (framepos_t start, double bpb, double note_type)
120 : MetricSection (start), Meter (bpb, note_type) {}
121 MeterSection (const XMLNode&);
123 static const std::string xml_state_node_name;
125 XMLNode& get_state() const;
128 class TempoSection : public MetricSection, public Tempo {
130 TempoSection (const Timecode::BBT_Time& start, double qpm, double note_type)
131 : MetricSection (start), Tempo (qpm, note_type) {}
132 TempoSection (framepos_t start, double qpm, double note_type)
133 : MetricSection (start), Tempo (qpm, note_type) {}
134 TempoSection (const XMLNode&);
136 static const std::string xml_state_node_name;
138 XMLNode& get_state() const;
141 typedef std::list<MetricSection*> Metrics;
143 /** Helper class that we use to be able to keep track of which
144 meter *AND* tempo are in effect at a given point in time.
148 TempoMetric (const Meter& m, const Tempo& t) : _meter (&m), _tempo (&t), _frame (0) {}
150 void set_tempo (const Tempo& t) { _tempo = &t; }
151 void set_meter (const Meter& m) { _meter = &m; }
152 void set_frame (framepos_t f) { _frame = f; }
153 void set_start (const Timecode::BBT_Time& t) { _start = t; }
155 const Meter& meter() const { return *_meter; }
156 const Tempo& tempo() const { return *_tempo; }
157 framepos_t frame() const { return _frame; }
158 const Timecode::BBT_Time& start() const { return _start; }
164 Timecode::BBT_Time _start;
167 class TempoMap : public PBD::StatefulDestructible
170 TempoMap (framecnt_t frame_rate);
173 /* measure-based stuff */
188 BBTPoint (const Meter& m, const Tempo& t, framepos_t f,
189 BBTPointType ty, uint32_t b, uint32_t e)
190 : type (ty), frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
193 typedef std::vector<BBTPoint> BBTPointList;
195 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
196 Glib::RWLock::ReaderLock lm (lock);
197 (obj.*method)(*metrics);
200 BBTPointList *get_points (framepos_t start, framepos_t end) const;
202 void bbt_time (framepos_t when, Timecode::BBT_Time&) const;
203 framecnt_t frame_time (const Timecode::BBT_Time&) const;
204 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir) const;
206 static const Tempo& default_tempo() { return _default_tempo; }
207 static const Meter& default_meter() { return _default_meter; }
209 const Tempo& tempo_at (framepos_t) const;
210 const Meter& meter_at (framepos_t) const;
212 const TempoSection& tempo_section_at (framepos_t) const;
214 void add_tempo(const Tempo&, Timecode::BBT_Time where);
215 void add_meter(const Meter&, Timecode::BBT_Time where);
217 void add_tempo(const Tempo&, framepos_t where);
218 void add_meter(const Meter&, framepos_t where);
220 void move_tempo (TempoSection&, const Timecode::BBT_Time& to);
221 void move_meter (MeterSection&, const Timecode::BBT_Time& to);
223 void remove_tempo(const TempoSection&);
224 void remove_meter(const MeterSection&);
226 void replace_tempo (TempoSection& existing, const Tempo& replacement);
227 void replace_meter (MeterSection& existing, const Meter& replacement);
229 framepos_t round_to_bar (framepos_t frame, int dir);
230 framepos_t round_to_beat (framepos_t frame, int dir);
231 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, int dir);
232 framepos_t round_to_tick (framepos_t frame, int dir);
234 void set_length (framepos_t frames);
236 XMLNode& get_state (void);
237 int set_state (const XMLNode&, int version);
239 void dump (std::ostream&) const;
242 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
243 TempoMetric metric_at (framepos_t) const;
244 void bbt_time_with_metric (framepos_t, Timecode::BBT_Time&, const TempoMetric&) const;
246 Timecode::BBT_Time bbt_add (const Timecode::BBT_Time&, const Timecode::BBT_Time&, const TempoMetric&) const;
247 Timecode::BBT_Time bbt_add (const Timecode::BBT_Time& a, const Timecode::BBT_Time& b) const;
248 Timecode::BBT_Time bbt_subtract (const Timecode::BBT_Time&, const Timecode::BBT_Time&) const;
250 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
251 framepos_t framepos_plus_beats (framepos_t, Evoral::MusicalTime) const;
252 framepos_t framepos_minus_beats (framepos_t, Evoral::MusicalTime) const;
253 Evoral::MusicalTime framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
255 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
256 void change_initial_tempo (double bpm, double note_type);
258 void insert_time (framepos_t, framecnt_t);
260 int n_tempos () const;
261 int n_meters () const;
263 framecnt_t frame_rate () const { return _frame_rate; }
266 static Tempo _default_tempo;
267 static Meter _default_meter;
270 framecnt_t _frame_rate;
271 framepos_t last_bbt_when;
273 Timecode::BBT_Time last_bbt;
274 mutable Glib::RWLock lock;
276 void timestamp_metrics (bool use_bbt);
278 framepos_t round_to_type (framepos_t fr, int dir, BBTPointType);
280 framepos_t frame_time_unlocked (const Timecode::BBT_Time&) const;
282 void bbt_time_unlocked (framepos_t, Timecode::BBT_Time&) const;
284 framecnt_t bbt_duration_at_unlocked (const Timecode::BBT_Time& when, const Timecode::BBT_Time& bbt, int dir) const;
286 const MeterSection& first_meter() const;
287 const TempoSection& first_tempo() const;
289 framecnt_t count_frames_between (const Timecode::BBT_Time&, const Timecode::BBT_Time&) const;
290 framecnt_t count_frames_between_metrics (const Meter&, const Tempo&,
291 const Timecode::BBT_Time&, const Timecode::BBT_Time&) const;
293 int move_metric_section (MetricSection&, const Timecode::BBT_Time& to);
294 void do_insert (MetricSection* section, bool with_bbt);
297 }; /* namespace ARDOUR */
299 #endif /* __ardour_tempo_h__ */