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 <sigc++/signal.h>
35 #include <ardour/ardour.h>
47 : _beats_per_minute (bpm) {}
48 Tempo (const Tempo& other) {
49 _beats_per_minute = other._beats_per_minute;
51 void operator= (const Tempo& other) {
53 _beats_per_minute = other._beats_per_minute;
57 double beats_per_minute () const { return _beats_per_minute; }
58 double frames_per_beat (nframes_t sr) const {
59 return ((60.0 * sr) / _beats_per_minute);
63 double _beats_per_minute;
68 static const double ticks_per_beat;
70 Meter (double bpb, double bt)
71 : _beats_per_bar (bpb), _note_type (bt) {}
72 Meter (const Meter& other) {
73 _beats_per_bar = other._beats_per_bar;
74 _note_type = other._note_type;
76 void operator= (const Meter& other) {
78 _beats_per_bar = other._beats_per_bar;
79 _note_type = other._note_type;
83 double beats_per_bar () const { return _beats_per_bar; }
84 double note_divisor() const { return _note_type; }
86 double frames_per_bar (const Tempo&, nframes_t sr) const;
90 /* this is the number of beats in a bar. it is a real value
91 because there are musical traditions on our planet
92 that do not limit themselves to integral numbers of beats
96 double _beats_per_bar;
98 /* this is the type of "note" that a beat represents. for example,
99 4.0 would be a quarter (crotchet) note, 8.0 would be an eighth
106 class MetricSection {
108 MetricSection (const BBT_Time& start)
109 : _start (start), _frame (0), _movable (true) {}
110 virtual ~MetricSection() {}
112 const BBT_Time& start() const { return _start; }
113 const nframes_t frame() const { return _frame; }
115 void set_movable (bool yn) { _movable = yn; }
116 bool movable() const { return _movable; }
118 virtual void set_frame (nframes_t f) {
122 virtual void set_start (const BBT_Time& w) {
126 /* MeterSections are not stateful in the full sense,
127 but we do want them to control their own
128 XML state information.
131 virtual XMLNode& get_state() const = 0;
139 class MeterSection : public MetricSection, public Meter {
141 MeterSection (const BBT_Time& start, double bpb, double note_type)
142 : MetricSection (start), Meter (bpb, note_type) {}
143 MeterSection (const XMLNode&);
145 static const string xml_state_node_name;
147 XMLNode& get_state() const;
150 class TempoSection : public MetricSection, public Tempo {
152 TempoSection (const BBT_Time& start, double qpm)
153 : MetricSection (start), Tempo (qpm) {}
154 TempoSection (const XMLNode&);
156 static const string xml_state_node_name;
158 XMLNode& get_state() const;
161 typedef list<MetricSection*> Metrics;
163 class TempoMap : public PBD::StatefulDestructible
167 TempoMap (nframes_t frame_rate);
170 /* measure-based stuff */
185 BBTPoint (const Meter& m, const Tempo& t, nframes_t f, BBTPointType ty, uint32_t b, uint32_t e)
186 : type (ty), frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
189 typedef vector<BBTPoint> BBTPointList;
191 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
192 Glib::RWLock::ReaderLock lm (lock);
193 (obj.*method)(*metrics);
196 BBTPointList *get_points (nframes_t start, nframes_t end) const;
198 void bbt_time (nframes_t when, BBT_Time&) const;
199 nframes_t frame_time (const BBT_Time&) const;
200 nframes_t bbt_duration_at (nframes_t, const BBT_Time&, int dir) const;
202 static const Tempo& default_tempo() { return _default_tempo; }
203 static const Meter& default_meter() { return _default_meter; }
205 const Tempo& tempo_at (nframes_t);
206 const Meter& meter_at (nframes_t);
208 void add_tempo(const Tempo&, BBT_Time where);
209 void add_meter(const Meter&, BBT_Time where);
211 void move_tempo (TempoSection&, const BBT_Time& to);
212 void move_meter (MeterSection&, const BBT_Time& to);
214 void remove_tempo(const TempoSection&);
215 void remove_meter(const MeterSection&);
217 void replace_tempo (TempoSection& existing, const Tempo& replacement);
218 void replace_meter (MeterSection& existing, const Meter& replacement);
221 nframes_t round_to_bar (nframes_t frame, int dir);
223 nframes_t round_to_beat (nframes_t frame, int dir);
225 nframes_t round_to_beat_subdivision (nframes_t fr, int sub_num);
227 nframes_t round_to_tick (nframes_t frame, int dir);
229 void set_length (nframes_t frames);
231 XMLNode& get_state (void);
232 int set_state (const XMLNode&);
234 void dump (std::ostream&) const;
237 /* this is a helper class that we use to be able to keep
238 track of which meter *AND* tempo are in effect at
239 a given point in time.
244 Metric (const Meter& m, const Tempo& t) : _meter (&m), _tempo (&t), _frame (0) {}
246 void set_tempo (const Tempo& t) { _tempo = &t; }
247 void set_meter (const Meter& m) { _meter = &m; }
248 void set_frame (nframes_t f) { _frame = f; }
249 void set_start (const BBT_Time& t) { _start = t; }
251 const Meter& meter() const { return *_meter; }
252 const Tempo& tempo() const { return *_tempo; }
253 nframes_t frame() const { return _frame; }
254 const BBT_Time& start() const { return _start; }
264 Metric metric_at (BBT_Time bbt) const;
265 Metric metric_at (nframes_t) const;
266 void bbt_time_with_metric (nframes_t, BBT_Time&, const Metric&) const;
268 sigc::signal<void,ARDOUR::Change> StateChanged;
271 static Tempo _default_tempo;
272 static Meter _default_meter;
275 nframes_t _frame_rate;
276 nframes_t last_bbt_when;
279 mutable Glib::RWLock lock;
281 void timestamp_metrics ();
284 nframes_t round_to_type (nframes_t fr, int dir, BBTPointType);
286 nframes_t frame_time_unlocked (const BBT_Time&) const;
288 void bbt_time_unlocked (nframes_t, BBT_Time&) const;
290 nframes_t bbt_duration_at_unlocked (const BBT_Time& when, const BBT_Time& bbt, int dir) const;
292 const MeterSection& first_meter() const;
293 const TempoSection& first_tempo() const;
295 nframes_t count_frames_between (const BBT_Time&, const BBT_Time&) const;
296 nframes_t count_frames_between_metrics (const Meter&, const Tempo&, const BBT_Time&, const BBT_Time&) const;
298 int move_metric_section (MetricSection&, const BBT_Time& to);
299 void do_insert (MetricSection* section);
302 }; /* namespace ARDOUR */
304 #endif /* __ardour_tempo_h__ */