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"
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 (framecnt_t sr) const;
54 double _beats_per_minute;
60 Meter (double dpb, double bt)
61 : _divisions_per_bar (dpb), _note_type (bt) {}
63 double divisions_per_bar () const { return _divisions_per_bar; }
64 double note_divisor() const { return _note_type; }
66 double frames_per_bar (const Tempo&, framecnt_t sr) const;
67 double frames_per_division (const Tempo&, framecnt_t sr) const;
70 /** The number of divisions in a bar. This is a floating point value because
71 there are musical traditions on our planet that do not limit
72 themselves to integral numbers of beats per bar.
74 double _divisions_per_bar;
76 /** The type of "note" that a division represents. For example, 4.0 is
77 a quarter (crotchet) note, 8.0 is an eighth (quaver) note, etc.
84 MetricSection (const Timecode::BBT_Time& start)
85 : _start (start), _frame (0), _movable (true) {}
86 MetricSection (framepos_t start)
87 : _frame (start), _movable (true) {}
89 virtual ~MetricSection() {}
91 const Timecode::BBT_Time& start() const { return _start; }
92 framepos_t frame() const { return _frame; }
94 void set_movable (bool yn) { _movable = yn; }
95 bool movable() const { return _movable; }
97 virtual void set_frame (framepos_t f) {
101 virtual void set_start (const Timecode::BBT_Time& w) {
105 /* MeterSections are not stateful in the full sense,
106 but we do want them to control their own
107 XML state information.
109 virtual XMLNode& get_state() const = 0;
111 int compare (const MetricSection&) const;
112 bool operator== (const MetricSection& other) const;
113 bool operator!= (const MetricSection& other) const;
116 Timecode::BBT_Time _start;
121 class MeterSection : public MetricSection, public Meter {
123 MeterSection (const Timecode::BBT_Time& start, double bpb, double note_type)
124 : MetricSection (start), Meter (bpb, note_type) {}
125 MeterSection (framepos_t start, double bpb, double note_type)
126 : MetricSection (start), Meter (bpb, note_type) {}
127 MeterSection (const XMLNode&);
129 static const std::string xml_state_node_name;
131 XMLNode& get_state() const;
134 class TempoSection : public MetricSection, public Tempo {
136 TempoSection (const Timecode::BBT_Time& start, double qpm, double note_type)
137 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0) {}
138 TempoSection (framepos_t start, double qpm, double note_type)
139 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0) {}
140 TempoSection (const XMLNode&);
142 static const std::string xml_state_node_name;
144 XMLNode& get_state() const;
146 void update_bar_offset_from_bbt (const Meter&);
147 void update_bbt_time_from_bar_offset (const Meter&);
148 double bar_offset() const { return _bar_offset; }
151 /* this value provides a fractional offset into the bar in which
152 the tempo section is located in. A value of 0.0 indicates that
153 it occurs on the first beat of the bar, a value of 0.5 indicates
154 that it occurs halfway through the bar and so on.
156 this enables us to keep the tempo change at the same relative
157 position within the bar if/when the meter changes.
162 typedef std::list<MetricSection*> Metrics;
164 /** Helper class that we use to be able to keep track of which
165 meter *AND* tempo are in effect at a given point in time.
169 TempoMetric (const Meter& m, const Tempo& t) : _meter (&m), _tempo (&t), _frame (0) {}
171 void set_tempo (const Tempo& t) { _tempo = &t; }
172 void set_meter (const Meter& m) { _meter = &m; }
173 void set_frame (framepos_t f) { _frame = f; }
174 void set_start (const Timecode::BBT_Time& t) { _start = t; }
176 const Meter& meter() const { return *_meter; }
177 const Tempo& tempo() const { return *_tempo; }
178 framepos_t frame() const { return _frame; }
179 const Timecode::BBT_Time& start() const { return _start; }
185 Timecode::BBT_Time _start;
188 class TempoMap : public PBD::StatefulDestructible
191 TempoMap (framecnt_t frame_rate);
194 /* measure-based stuff */
209 BBTPoint (const Meter& m, const Tempo& t, framepos_t f,
210 BBTPointType ty, uint32_t b, uint32_t e)
211 : type (ty), frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
214 typedef std::vector<BBTPoint> BBTPointList;
216 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
217 Glib::RWLock::ReaderLock lm (lock);
218 (obj.*method)(*metrics);
221 BBTPointList *get_points (framepos_t start, framepos_t end) const;
223 void bbt_time (framepos_t when, Timecode::BBT_Time&) const;
224 framecnt_t frame_time (const Timecode::BBT_Time&) const;
225 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir) const;
227 static const Tempo& default_tempo() { return _default_tempo; }
228 static const Meter& default_meter() { return _default_meter; }
230 const Tempo& tempo_at (framepos_t) const;
231 const Meter& meter_at (framepos_t) const;
233 const TempoSection& tempo_section_at (framepos_t) const;
235 void add_tempo(const Tempo&, Timecode::BBT_Time where);
236 void add_meter(const Meter&, Timecode::BBT_Time where);
238 void remove_tempo(const TempoSection&, bool send_signal);
239 void remove_meter(const MeterSection&, bool send_signal);
241 void replace_tempo (const TempoSection&, const Tempo&, const Timecode::BBT_Time& where);
242 void replace_meter (const MeterSection&, const Meter&, const Timecode::BBT_Time& where);
244 framepos_t round_to_bar (framepos_t frame, int dir);
245 framepos_t round_to_beat (framepos_t frame, int dir);
246 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, int dir);
247 framepos_t round_to_tick (framepos_t frame, int dir);
249 void set_length (framepos_t frames);
251 XMLNode& get_state (void);
252 int set_state (const XMLNode&, int version);
254 void dump (std::ostream&) const;
257 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
258 TempoMetric metric_at (framepos_t) const;
259 void bbt_time_with_metric (framepos_t, Timecode::BBT_Time&, const TempoMetric&) const;
261 Timecode::BBT_Time bbt_add (const Timecode::BBT_Time&, const Timecode::BBT_Time&, const TempoMetric&) const;
262 Timecode::BBT_Time bbt_add (const Timecode::BBT_Time& a, const Timecode::BBT_Time& b) const;
263 Timecode::BBT_Time bbt_subtract (const Timecode::BBT_Time&, const Timecode::BBT_Time&) const;
265 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
266 framepos_t framepos_plus_beats (framepos_t, Evoral::MusicalTime) const;
267 framepos_t framepos_minus_beats (framepos_t, Evoral::MusicalTime) const;
268 Evoral::MusicalTime framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
270 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
271 void change_initial_tempo (double bpm, double note_type);
273 void insert_time (framepos_t, framecnt_t);
275 int n_tempos () const;
276 int n_meters () const;
278 framecnt_t frame_rate () const { return _frame_rate; }
281 static Tempo _default_tempo;
282 static Meter _default_meter;
285 framecnt_t _frame_rate;
286 framepos_t last_bbt_when;
288 Timecode::BBT_Time last_bbt;
289 mutable Glib::RWLock lock;
291 void timestamp_metrics (bool reassign_bar_references);
292 void timestamp_metrics_from_audio_time ();
294 framepos_t round_to_type (framepos_t fr, int dir, BBTPointType);
296 framepos_t frame_time_unlocked (const Timecode::BBT_Time&) const;
298 void bbt_time_unlocked (framepos_t, Timecode::BBT_Time&) const;
300 framecnt_t bbt_duration_at_unlocked (const Timecode::BBT_Time& when, const Timecode::BBT_Time& bbt, int dir) const;
302 const MeterSection& first_meter() const;
303 const TempoSection& first_tempo() const;
305 framecnt_t count_frames_between (const Timecode::BBT_Time&, const Timecode::BBT_Time&) const;
306 framecnt_t count_frames_with_metrics (const TempoMetric&, const TempoMetric&, const Timecode::BBT_Time&, const Timecode::BBT_Time&) const;
307 framecnt_t count_frames_between_metrics (const Meter& meter, const Tempo& tempo, const Timecode::BBT_Time& start, const Timecode::BBT_Time& end) const;
309 int move_metric_section (MetricSection&, const Timecode::BBT_Time& to);
310 void do_insert (MetricSection* section);
313 }; /* namespace ARDOUR */
315 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
316 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
317 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
319 #endif /* __ardour_tempo_h__ */