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>
30 #include <pbd/stateful.h>
31 #include <sigc++/signal.h>
33 #include <ardour/ardour.h>
34 #include <ardour/state_manager.h>
46 : _beats_per_minute (bpm) {}
47 Tempo (const Tempo& other) {
48 _beats_per_minute = other._beats_per_minute;
50 void operator= (const Tempo& other) {
52 _beats_per_minute = other._beats_per_minute;
56 double beats_per_minute () const { return _beats_per_minute; }
57 double frames_per_beat (jack_nframes_t sr) const {
58 return ((60.0 * sr) / _beats_per_minute);
62 double _beats_per_minute;
67 static const double ticks_per_beat;
69 Meter (double bpb, double bt)
70 : _beats_per_bar (bpb), _note_type (bt) {}
71 Meter (const Meter& other) {
72 _beats_per_bar = other._beats_per_bar;
73 _note_type = other._note_type;
75 void operator= (const Meter& other) {
77 _beats_per_bar = other._beats_per_bar;
78 _note_type = other._note_type;
82 double beats_per_bar () const { return _beats_per_bar; }
83 double note_divisor() const { return _note_type; }
85 double frames_per_bar (const Tempo&, jack_nframes_t sr) const;
89 /* this is the number of beats in a bar. it is a real value
90 because there are musical traditions on our planet
91 that do not limit themselves to integral numbers of beats
95 double _beats_per_bar;
97 /* this is the type of "note" that a beat represents. for example,
98 4.0 would be a quarter (crotchet) note, 8.0 would be an eighth
105 class MetricSection {
107 MetricSection (const BBT_Time& start)
108 : _start (start), _frame (0), _movable (true) {}
109 virtual ~MetricSection() {}
111 const BBT_Time& start() const { return _start; }
112 const jack_nframes_t frame() const { return _frame; }
114 void set_movable (bool yn) { _movable = yn; }
115 bool movable() const { return _movable; }
117 virtual void set_frame (jack_nframes_t f) {
121 virtual void set_start (const BBT_Time& w) {
125 /* MeterSections are not stateful in the full sense,
126 but we do want them to control their own
127 XML state information.
130 virtual XMLNode& get_state() const = 0;
134 jack_nframes_t _frame;
138 class MeterSection : public MetricSection, public Meter {
140 MeterSection (const BBT_Time& start, double bpb, double note_type)
141 : MetricSection (start), Meter (bpb, note_type) {}
142 MeterSection (const XMLNode&);
144 static const string xml_state_node_name;
146 XMLNode& get_state() const;
149 class TempoSection : public MetricSection, public Tempo {
151 TempoSection (const BBT_Time& start, double qpm)
152 : MetricSection (start), Tempo (qpm) {}
153 TempoSection (const XMLNode&);
155 static const string xml_state_node_name;
157 XMLNode& get_state() const;
160 typedef list<MetricSection*> Metrics;
162 class TempoMapState : public StateManager::State {
164 TempoMapState (std::string why)
165 : StateManager::State (why) {
166 metrics = new Metrics;
172 class TempoMap : public Stateful, public StateManager {
175 TempoMap (jack_nframes_t frame_rate);
178 /* measure-based stuff */
187 jack_nframes_t frame;
193 BBTPoint (const Meter& m, const Tempo& t, jack_nframes_t f, BBTPointType ty, uint32_t b, uint32_t e)
194 : type (ty), frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
197 typedef vector<BBTPoint> BBTPointList;
199 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
200 Glib::Mutex::Lock lm (lock);
201 (obj.*method)(*metrics);
204 BBTPointList *get_points (jack_nframes_t start, jack_nframes_t end) const;
206 void bbt_time (jack_nframes_t when, BBT_Time&) const;
207 jack_nframes_t frame_time (const BBT_Time&) const;
208 jack_nframes_t bbt_duration_at (jack_nframes_t, const BBT_Time&, int dir) const;
210 static const Tempo& default_tempo() { return _default_tempo; }
211 static const Meter& default_meter() { return _default_meter; }
213 const Tempo& tempo_at (jack_nframes_t);
214 const Meter& meter_at (jack_nframes_t);
216 void add_tempo(const Tempo&, BBT_Time where);
217 void add_meter(const Meter&, BBT_Time where);
219 void move_tempo (TempoSection&, const BBT_Time& to);
220 void move_meter (MeterSection&, const BBT_Time& to);
222 void remove_tempo(const TempoSection&);
223 void remove_meter(const MeterSection&);
225 void replace_tempo (TempoSection& existing, const Tempo& replacement);
226 void replace_meter (MeterSection& existing, const Meter& replacement);
229 jack_nframes_t round_to_bar (jack_nframes_t frame, int dir);
231 jack_nframes_t round_to_beat (jack_nframes_t frame, int dir);
233 jack_nframes_t round_to_beat_subdivision (jack_nframes_t fr, int sub_num);
235 jack_nframes_t round_to_tick (jack_nframes_t frame, int dir);
237 void set_length (jack_nframes_t frames);
239 XMLNode& get_state (void);
240 int set_state (const XMLNode&);
242 void dump (std::ostream&) const;
245 UndoAction get_memento() const;
247 /* this is a helper class that we use to be able to keep
248 track of which meter *AND* tempo are in effect at
249 a given point in time.
254 Metric (const Meter& m, const Tempo& t) : _meter (&m), _tempo (&t), _frame (0) {}
256 void set_tempo (const Tempo& t) { _tempo = &t; }
257 void set_meter (const Meter& m) { _meter = &m; }
258 void set_frame (jack_nframes_t f) { _frame = f; }
259 void set_start (const BBT_Time& t) { _start = t; }
261 const Meter& meter() const { return *_meter; }
262 const Tempo& tempo() const { return *_tempo; }
263 jack_nframes_t frame() const { return _frame; }
264 const BBT_Time& start() const { return _start; }
269 jack_nframes_t _frame;
274 Metric metric_at (BBT_Time bbt) const;
275 Metric metric_at (jack_nframes_t) const;
276 void bbt_time_with_metric (jack_nframes_t, BBT_Time&, const Metric&) const;
279 static Tempo _default_tempo;
280 static Meter _default_meter;
283 jack_nframes_t _frame_rate;
284 jack_nframes_t last_bbt_when;
287 mutable Glib::Mutex lock;
289 void timestamp_metrics ();
292 jack_nframes_t round_to_type (jack_nframes_t fr, int dir, BBTPointType);
294 jack_nframes_t frame_time_unlocked (const BBT_Time&) const;
296 void bbt_time_unlocked (jack_nframes_t, BBT_Time&) const;
298 jack_nframes_t bbt_duration_at_unlocked (const BBT_Time& when, const BBT_Time& bbt, int dir) const;
300 const MeterSection& first_meter() const;
301 const TempoSection& first_tempo() const;
303 jack_nframes_t count_frames_between (const BBT_Time&, const BBT_Time&) const;
304 jack_nframes_t count_frames_between_metrics (const Meter&, const Tempo&, const BBT_Time&, const BBT_Time&) const;
306 int move_metric_section (MetricSection&, const BBT_Time& to);
307 void do_insert (MetricSection* section);
309 Change restore_state (StateManager::State&);
310 StateManager::State* state_factory (std::string why) const;
314 /* override state_manager::save_state so we can check in_set_state */
316 void save_state (std::string why);
320 }; /* namespace ARDOUR */
322 #endif /* __ardour_tempo_h__ */