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"
46 Tempo (double bpm, double type=4.0) // defaulting to quarter note
47 : _beats_per_minute (bpm), _note_type(type) {}
49 double beats_per_minute () const { return _beats_per_minute;}
50 double note_type () const { return _note_type;}
51 double frames_per_beat (nframes_t sr, const Meter& meter) const;
54 double _beats_per_minute;
60 static const double ticks_per_beat;
62 Meter (double bpb, double bt)
63 : _beats_per_bar (bpb), _note_type (bt) {}
65 double beats_per_bar () const { return _beats_per_bar; }
66 double note_divisor() const { return _note_type; }
68 double frames_per_bar (const Tempo&, nframes_t sr) const;
71 /** The number of beats in a bar. This is a real value because
72 there are musical traditions on our planet that do not limit
73 themselves to integral numbers of beats per bar.
75 double _beats_per_bar;
77 /** The type of "note" that a beat represents. For example, 4.0 is
78 a quarter (crotchet) note, 8.0 is an eighth (quaver) note, etc.
85 MetricSection (const BBT_Time& start)
86 : _start (start), _frame (0), _movable (true) {}
87 MetricSection (nframes_t start)
88 : _frame (start), _movable (true) {}
90 virtual ~MetricSection() {}
92 const BBT_Time& start() const { return _start; }
93 nframes_t frame() const { return _frame; }
95 void set_movable (bool yn) { _movable = yn; }
96 bool movable() const { return _movable; }
98 virtual void set_frame (nframes_t f) {
102 virtual void set_start (const BBT_Time& w) {
106 /* MeterSections are not stateful in the full sense,
107 but we do want them to control their own
108 XML state information.
110 virtual XMLNode& get_state() const = 0;
118 class MeterSection : public MetricSection, public Meter {
120 MeterSection (const BBT_Time& start, double bpb, double note_type)
121 : MetricSection (start), Meter (bpb, note_type) {}
122 MeterSection (nframes_t start, double bpb, double note_type)
123 : MetricSection (start), Meter (bpb, note_type) {}
124 MeterSection (const XMLNode&);
126 static const string xml_state_node_name;
128 XMLNode& get_state() const;
131 class TempoSection : public MetricSection, public Tempo {
133 TempoSection (const BBT_Time& start, double qpm, double note_type)
134 : MetricSection (start), Tempo (qpm, note_type) {}
135 TempoSection (nframes_t start, double qpm, double note_type)
136 : MetricSection (start), Tempo (qpm, note_type) {}
137 TempoSection (const XMLNode&);
139 static const string xml_state_node_name;
141 XMLNode& get_state() const;
144 typedef list<MetricSection*> Metrics;
146 class TempoMap : public PBD::StatefulDestructible
149 TempoMap (nframes_t frame_rate);
152 /* measure-based stuff */
167 BBTPoint (const Meter& m, const Tempo& t, nframes_t f,
168 BBTPointType ty, uint32_t b, uint32_t e)
169 : type (ty), frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
172 typedef vector<BBTPoint> BBTPointList;
174 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
175 Glib::RWLock::ReaderLock lm (lock);
176 (obj.*method)(*metrics);
179 BBTPointList *get_points (nframes_t start, nframes_t end) const;
181 void bbt_time (nframes_t when, BBT_Time&) const;
182 nframes_t frame_time (const BBT_Time&) const;
183 nframes_t bbt_duration_at (nframes_t, const BBT_Time&, int dir) const;
185 static const Tempo& default_tempo() { return _default_tempo; }
186 static const Meter& default_meter() { return _default_meter; }
188 const Tempo& tempo_at (nframes_t);
189 const Meter& meter_at (nframes_t);
191 const TempoSection& tempo_section_at (nframes_t);
193 void add_tempo(const Tempo&, BBT_Time where);
194 void add_meter(const Meter&, BBT_Time where);
196 void add_tempo(const Tempo&, nframes_t where);
197 void add_meter(const Meter&, nframes_t where);
199 void move_tempo (TempoSection&, const BBT_Time& to);
200 void move_meter (MeterSection&, const BBT_Time& to);
202 void remove_tempo(const TempoSection&);
203 void remove_meter(const MeterSection&);
205 void replace_tempo (TempoSection& existing, const Tempo& replacement);
206 void replace_meter (MeterSection& existing, const Meter& replacement);
208 nframes_t round_to_bar (nframes_t frame, int dir);
209 nframes_t round_to_beat (nframes_t frame, int dir);
210 nframes_t round_to_beat_subdivision (nframes_t fr, int sub_num);
211 nframes_t round_to_tick (nframes_t frame, int dir);
213 void set_length (nframes_t frames);
215 XMLNode& get_state (void);
216 int set_state (const XMLNode&);
218 void dump (std::ostream&) const;
221 /** Helper class that we use to be able to keep track of which
222 meter *AND* tempo are in effect at a given point in time.
226 Metric (const Meter& m, const Tempo& t) : _meter (&m), _tempo (&t), _frame (0) {}
228 void set_tempo (const Tempo& t) { _tempo = &t; }
229 void set_meter (const Meter& m) { _meter = &m; }
230 void set_frame (nframes_t f) { _frame = f; }
231 void set_start (const BBT_Time& t) { _start = t; }
233 const Meter& meter() const { return *_meter; }
234 const Tempo& tempo() const { return *_tempo; }
235 nframes_t frame() const { return _frame; }
236 const BBT_Time& start() const { return _start; }
245 Metric metric_at (BBT_Time bbt) const;
246 Metric metric_at (nframes_t) const;
247 void bbt_time_with_metric (nframes_t, BBT_Time&, const Metric&) const;
249 void change_existing_tempo_at (nframes_t, double bpm, double note_type);
250 void change_initial_tempo (double bpm, double note_type);
252 int n_tempos () const;
253 int n_meters () const;
255 sigc::signal<void,ARDOUR::Change> StateChanged;
258 static Tempo _default_tempo;
259 static Meter _default_meter;
262 nframes_t _frame_rate;
263 nframes_t last_bbt_when;
266 mutable Glib::RWLock lock;
268 void timestamp_metrics (bool use_bbt);
270 nframes_t round_to_type (nframes_t fr, int dir, BBTPointType);
272 nframes_t frame_time_unlocked (const BBT_Time&) const;
274 void bbt_time_unlocked (nframes_t, BBT_Time&) const;
276 nframes_t bbt_duration_at_unlocked (const BBT_Time& when, const BBT_Time& bbt, int dir) const;
278 const MeterSection& first_meter() const;
279 const TempoSection& first_tempo() const;
281 nframes_t count_frames_between (const BBT_Time&, const BBT_Time&) const;
282 nframes_t count_frames_between_metrics (const Meter&, const Tempo&,
283 const BBT_Time&, const BBT_Time&) const;
285 int move_metric_section (MetricSection&, const BBT_Time& to);
286 void do_insert (MetricSection* section, bool with_bbt);
289 }; /* namespace ARDOUR */
291 #endif /* __ardour_tempo_h__ */