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.
21 #ifndef __ardour_tempo_h__
22 #define __ardour_tempo_h__
28 #include <glibmm/thread.h>
31 #include <pbd/stateful.h>
32 #include <pbd/statefuldestructible.h>
34 #include <sigc++/signal.h>
36 #include <ardour/ardour.h>
48 : _beats_per_minute (bpm) {}
49 Tempo (const Tempo& other) {
50 _beats_per_minute = other._beats_per_minute;
52 void operator= (const Tempo& other) {
54 _beats_per_minute = other._beats_per_minute;
58 double beats_per_minute () const { return _beats_per_minute; }
59 double frames_per_beat (nframes_t sr) const {
60 return ((60.0 * sr) / _beats_per_minute);
64 double _beats_per_minute;
69 static const double ticks_per_beat;
71 Meter (double bpb, double bt)
72 : _beats_per_bar (bpb), _note_type (bt) {}
73 Meter (const Meter& other) {
74 _beats_per_bar = other._beats_per_bar;
75 _note_type = other._note_type;
77 void operator= (const Meter& other) {
79 _beats_per_bar = other._beats_per_bar;
80 _note_type = other._note_type;
84 double beats_per_bar () const { return _beats_per_bar; }
85 double note_divisor() const { return _note_type; }
87 double frames_per_bar (const Tempo&, nframes_t sr) const;
91 /* this is the number of beats in a bar. it is a real value
92 because there are musical traditions on our planet
93 that do not limit themselves to integral numbers of beats
97 double _beats_per_bar;
99 /* this is the type of "note" that a beat represents. for example,
100 4.0 would be a quarter (crotchet) note, 8.0 would be an eighth
107 class MetricSection {
109 MetricSection (const BBT_Time& start)
110 : _start (start), _frame (0), _movable (true) {}
111 virtual ~MetricSection() {}
113 const BBT_Time& start() const { return _start; }
114 const nframes_t frame() const { return _frame; }
116 void set_movable (bool yn) { _movable = yn; }
117 bool movable() const { return _movable; }
119 virtual void set_frame (nframes_t f) {
123 virtual void set_start (const BBT_Time& w) {
127 /* MeterSections are not stateful in the full sense,
128 but we do want them to control their own
129 XML state information.
132 virtual XMLNode& get_state() const = 0;
140 class MeterSection : public MetricSection, public Meter {
142 MeterSection (const BBT_Time& start, double bpb, double note_type)
143 : MetricSection (start), Meter (bpb, note_type) {}
144 MeterSection (const XMLNode&);
146 static const string xml_state_node_name;
148 XMLNode& get_state() const;
151 class TempoSection : public MetricSection, public Tempo {
153 TempoSection (const BBT_Time& start, double qpm)
154 : MetricSection (start), Tempo (qpm) {}
155 TempoSection (const XMLNode&);
157 static const string xml_state_node_name;
159 XMLNode& get_state() const;
162 typedef list<MetricSection*> Metrics;
164 class TempoMap : public PBD::StatefulDestructible
168 TempoMap (nframes_t frame_rate);
171 /* measure-based stuff */
186 BBTPoint (const Meter& m, const Tempo& t, nframes_t f, BBTPointType ty, uint32_t b, uint32_t e)
187 : type (ty), frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
190 typedef vector<BBTPoint> BBTPointList;
192 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
193 Glib::RWLock::ReaderLock lm (lock);
194 (obj.*method)(*metrics);
197 BBTPointList *get_points (nframes_t start, nframes_t end) const;
199 void bbt_time (nframes_t when, BBT_Time&) const;
200 nframes_t frame_time (const BBT_Time&) const;
201 nframes_t bbt_duration_at (nframes_t, const BBT_Time&, int dir) const;
203 static const Tempo& default_tempo() { return _default_tempo; }
204 static const Meter& default_meter() { return _default_meter; }
206 const Tempo& tempo_at (nframes_t);
207 const Meter& meter_at (nframes_t);
209 void add_tempo(const Tempo&, BBT_Time where);
210 void add_meter(const Meter&, BBT_Time where);
212 void move_tempo (TempoSection&, const BBT_Time& to);
213 void move_meter (MeterSection&, const BBT_Time& to);
215 void remove_tempo(const TempoSection&);
216 void remove_meter(const MeterSection&);
218 void replace_tempo (TempoSection& existing, const Tempo& replacement);
219 void replace_meter (MeterSection& existing, const Meter& replacement);
222 nframes_t round_to_bar (nframes_t frame, int dir);
224 nframes_t round_to_beat (nframes_t frame, int dir);
226 nframes_t round_to_beat_subdivision (nframes_t fr, int sub_num);
228 nframes_t round_to_tick (nframes_t frame, int dir);
230 void set_length (nframes_t frames);
232 XMLNode& get_state (void);
233 int set_state (const XMLNode&);
235 void dump (std::ostream&) const;
238 /* this is a helper class that we use to be able to keep
239 track of which meter *AND* tempo are in effect at
240 a given point in time.
245 Metric (const Meter& m, const Tempo& t) : _meter (&m), _tempo (&t), _frame (0) {}
247 void set_tempo (const Tempo& t) { _tempo = &t; }
248 void set_meter (const Meter& m) { _meter = &m; }
249 void set_frame (nframes_t f) { _frame = f; }
250 void set_start (const BBT_Time& t) { _start = t; }
252 const Meter& meter() const { return *_meter; }
253 const Tempo& tempo() const { return *_tempo; }
254 nframes_t frame() const { return _frame; }
255 const BBT_Time& start() const { return _start; }
265 Metric metric_at (BBT_Time bbt) const;
266 Metric metric_at (nframes_t) const;
267 void bbt_time_with_metric (nframes_t, BBT_Time&, const Metric&) const;
269 sigc::signal<void,ARDOUR::Change> StateChanged;
272 static Tempo _default_tempo;
273 static Meter _default_meter;
276 nframes_t _frame_rate;
277 nframes_t last_bbt_when;
280 mutable Glib::RWLock lock;
282 void timestamp_metrics ();
285 nframes_t round_to_type (nframes_t fr, int dir, BBTPointType);
287 nframes_t frame_time_unlocked (const BBT_Time&) const;
289 void bbt_time_unlocked (nframes_t, BBT_Time&) const;
291 nframes_t bbt_duration_at_unlocked (const BBT_Time& when, const BBT_Time& bbt, int dir) const;
293 const MeterSection& first_meter() const;
294 const TempoSection& first_tempo() const;
296 nframes_t count_frames_between (const BBT_Time&, const BBT_Time&) const;
297 nframes_t count_frames_between_metrics (const Meter&, const Tempo&, const BBT_Time&, const BBT_Time&) const;
299 int move_metric_section (MetricSection&, const BBT_Time& to);
300 void do_insert (MetricSection* section);
303 }; /* namespace ARDOUR */
305 #endif /* __ardour_tempo_h__ */