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/threads.h>
31 #include "pbd/stateful.h"
32 #include "pbd/statefuldestructible.h"
34 #include "evoral/Beats.hpp"
36 #include "ardour/ardour.h"
39 class FrameposPlusBeatsTest;
48 /** Tempo, the speed at which musical time progresses (BPM). */
49 class LIBARDOUR_API Tempo {
52 * @param bpm Beats Per Minute
53 * @param type Note Type (default `4': quarter note)
55 Tempo (double bpm, double type=4.0) // defaulting to quarter note
56 : _beats_per_minute (bpm), _note_type(type) {}
58 double beats_per_minute () const { return _beats_per_minute; }
59 void set_beats_per_minute (double bpm) { _beats_per_minute = bpm; }
60 double note_type () const { return _note_type; }
61 double pulses_per_minute () const { return _beats_per_minute / _note_type; }
62 /** audio samples per beat
63 * @param sr samplerate
65 double frames_per_beat (framecnt_t sr) const {
66 return (60.0 * sr) / _beats_per_minute;
68 double frames_per_pulse (framecnt_t sr) const {
69 return (_note_type * 60.0 * sr) / _beats_per_minute;
73 double _beats_per_minute;
77 /** Meter, or time signature (beats per bar, and which note type is a beat). */
78 class LIBARDOUR_API Meter {
80 Meter (double dpb, double bt)
81 : _divisions_per_bar (dpb), _note_type (bt) {}
83 double divisions_per_bar () const { return _divisions_per_bar; }
84 double note_divisor() const { return _note_type; }
86 double frames_per_bar (const Tempo&, framecnt_t sr) const;
87 double frames_per_grid (const Tempo&, framecnt_t sr) const;
90 /** The number of divisions in a bar. This is a floating point value because
91 there are musical traditions on our planet that do not limit
92 themselves to integral numbers of beats per bar.
94 double _divisions_per_bar;
96 /** The type of "note" that a division represents. For example, 4.0 is
97 a quarter (crotchet) note, 8.0 is an eighth (quaver) note, etc.
102 /** A section of timeline with a certain Tempo or Meter. */
103 class LIBARDOUR_API MetricSection {
105 MetricSection (double pulse)
106 : _pulse (pulse), _frame (0), _movable (true), _position_lock_style (PositionLockStyle::MusicTime) {}
107 MetricSection (framepos_t frame)
108 : _pulse (0.0), _frame (frame), _movable (true), _position_lock_style (PositionLockStyle::AudioTime) {}
110 virtual ~MetricSection() {}
112 const double& pulse () const { return _pulse; }
113 void set_pulse (double pulse) { _pulse = pulse; }
115 framepos_t frame() const { return _frame; }
116 virtual void set_frame (framepos_t f) {
120 void set_movable (bool yn) { _movable = yn; }
121 bool movable() const { return _movable; }
123 /* MeterSections are not stateful in the full sense,
124 but we do want them to control their own
125 XML state information.
127 virtual XMLNode& get_state() const = 0;
129 PositionLockStyle position_lock_style () const { return _position_lock_style; }
130 void set_position_lock_style (PositionLockStyle ps) { _position_lock_style = ps; }
136 PositionLockStyle _position_lock_style;
139 /** A section of timeline with a certain Meter. */
140 class LIBARDOUR_API MeterSection : public MetricSection, public Meter {
142 MeterSection (double pulse, double beat, const Timecode::BBT_Time& bbt, double bpb, double note_type)
143 : MetricSection (pulse), Meter (bpb, note_type), _bbt (bbt), _beat (beat) {}
144 MeterSection (framepos_t frame, double beat, double bpb, double note_type)
145 : MetricSection (frame), Meter (bpb, note_type), _bbt (1, 1, 0), _beat (beat) {}
146 MeterSection (const XMLNode&);
148 static const std::string xml_state_node_name;
150 XMLNode& get_state() const;
152 void set_pulse (double w) {
153 MetricSection::set_pulse (w);
155 void set_beat (std::pair<double, Timecode::BBT_Time>& w) {
160 const Timecode::BBT_Time& bbt() const { return _bbt; }
161 const double& beat () const { return _beat; }
162 void set_beat (double beat) { _beat = beat; }
165 Timecode::BBT_Time _bbt;
169 /** A section of timeline with a certain Tempo. */
170 class LIBARDOUR_API TempoSection : public MetricSection, public Tempo {
177 TempoSection (const double& beat, double qpm, double note_type, Type tempo_type)
178 : MetricSection (beat), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type), _c_func (0.0), _active (true) {}
179 TempoSection (framepos_t frame, double qpm, double note_type, Type tempo_type)
180 : MetricSection (frame), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type), _c_func (0.0), _active (true) {}
181 TempoSection (const XMLNode&);
183 static const std::string xml_state_node_name;
185 XMLNode& get_state() const;
187 void update_bar_offset_from_bbt (const Meter&);
188 void update_bbt_time_from_bar_offset (const Meter&);
189 double bar_offset() const { return _bar_offset; }
191 bool active () const { return _active; }
192 void set_active (bool yn) { _active = yn; }
194 void set_type (Type type);
195 Type type () const { return _type; }
197 double tempo_at_frame (const framepos_t& frame, const framecnt_t& frame_rate) const;
198 framepos_t frame_at_tempo (const double& ppm, const double& beat, const framecnt_t& frame_rate) const;
200 double tempo_at_pulse (const double& pulse) const;
201 double pulse_at_tempo (const double& ppm, const framepos_t& frame, const framecnt_t& frame_rate) const;
203 double pulse_at_frame (const framepos_t& frame, const framecnt_t& frame_rate) const;
204 framepos_t frame_at_pulse (const double& pulse, const framecnt_t& frame_rate) const;
206 double compute_c_func_pulse (const double& end_bpm, const double& end_pulse, const framecnt_t& frame_rate);
207 double compute_c_func_frame (const double& end_bpm, const framepos_t& end_frame, const framecnt_t& frame_rate) const;
209 double get_c_func () const { return _c_func; }
210 void set_c_func (double c_func) { _c_func = c_func; }
212 Timecode::BBT_Time legacy_bbt () { return _legacy_bbt; }
216 framecnt_t minute_to_frame (const double& time, const framecnt_t& frame_rate) const;
217 double frame_to_minute (const framecnt_t& frame, const framecnt_t& frame_rate) const;
219 /* tempo ramp functions. zero-based with time in minutes,
220 * 'tick tempo' in ticks per minute and tempo in bpm.
221 * time relative to section start.
223 double a_func (double end_tpm, double c_func) const;
224 double c_func (double end_tpm, double end_time) const;
226 double pulse_tempo_at_time (const double& time) const;
227 double time_at_pulse_tempo (const double& pulse_tempo) const;
229 double pulse_tempo_at_pulse (const double& pulse) const;
230 double pulse_at_pulse_tempo (const double& pulse_tempo) const;
232 double pulse_at_time (const double& time) const;
233 double time_at_pulse (const double& pulse) const;
235 /* this value provides a fractional offset into the bar in which
236 the tempo section is located in. A value of 0.0 indicates that
237 it occurs on the first beat of the bar, a value of 0.5 indicates
238 that it occurs halfway through the bar and so on.
240 this enables us to keep the tempo change at the same relative
241 position within the bar if/when the meter changes.
247 Timecode::BBT_Time _legacy_bbt;
250 typedef std::list<MetricSection*> Metrics;
252 /** Helper class to keep track of the Meter *AND* Tempo in effect
253 at a given point in time.
255 class LIBARDOUR_API TempoMetric {
257 TempoMetric (const Meter& m, const Tempo& t)
258 : _meter (&m), _tempo (&t), _frame (0) {}
260 void set_tempo (const Tempo& t) { _tempo = &t; }
261 void set_meter (const Meter& m) { _meter = &m; }
262 void set_frame (framepos_t f) { _frame = f; }
263 void set_pulse (const double& p) { _pulse = p; }
265 void set_metric (const MetricSection* section) {
266 const MeterSection* meter;
267 const TempoSection* tempo;
268 if ((meter = dynamic_cast<const MeterSection*>(section))) {
270 } else if ((tempo = dynamic_cast<const TempoSection*>(section))) {
274 set_frame (section->frame());
275 set_pulse (section->pulse());
278 const Meter& meter() const { return *_meter; }
279 const Tempo& tempo() const { return *_tempo; }
280 framepos_t frame() const { return _frame; }
281 const double& pulse() const { return _pulse; }
290 /** Tempo Map - mapping of timecode to musical time.
291 * convert audio-samples, sample-rate to Bar/Beat/Tick, Meter/Tempo
293 class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
296 TempoMap (framecnt_t frame_rate);
299 /* measure-based stuff */
308 const MeterSection* meter;
313 BBTPoint (const MeterSection& m, const Tempo& t, framepos_t f,
314 uint32_t b, uint32_t e)
315 : frame (f), meter (&m), tempo (t.beats_per_minute(), t.note_type()), bar (b), beat (e) {}
317 Timecode::BBT_Time bbt() const { return Timecode::BBT_Time (bar, beat, 0); }
318 operator Timecode::BBT_Time() const { return bbt(); }
319 operator framepos_t() const { return frame; }
320 bool is_bar() const { return beat == 1; }
323 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
324 Glib::Threads::RWLock::ReaderLock lm (lock);
325 (obj.*method)(_metrics);
328 void get_grid (std::vector<BBTPoint>&,
329 framepos_t start, framepos_t end);
331 /* TEMPO- AND METER-SENSITIVE FUNCTIONS
333 bbt_time(), beat_at_frame(), frame_at_beat(), tick_at_frame(),
334 frame_at_tick(),frame_time() and bbt_duration_at()
335 are all sensitive to tempo and meter, and will give answers
336 that align with the grid formed by tempo and meter sections.
338 They SHOULD NOT be used to determine the position of events
339 whose location is canonically defined in beats.
342 void bbt_time (framepos_t when, Timecode::BBT_Time&);
344 double beat_at_frame (const framecnt_t& frame) const;
345 framecnt_t frame_at_beat (const double& beat) const;
347 framepos_t frame_time (const Timecode::BBT_Time&);
348 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir);
350 /* TEMPO-SENSITIVE FUNCTIONS
352 These next 4 functions will all take tempo in account and should be
353 used to determine position (and in the last case, distance in beats)
354 when tempo matters but meter does not.
356 They SHOULD be used to determine the position of events
357 whose location is canonically defined in beats.
360 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
361 framepos_t framepos_plus_beats (framepos_t, Evoral::Beats) const;
362 framepos_t framepos_minus_beats (framepos_t, Evoral::Beats) const;
363 Evoral::Beats framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
365 static const Tempo& default_tempo() { return _default_tempo; }
366 static const Meter& default_meter() { return _default_meter; }
368 const Tempo tempo_at (const framepos_t& frame) const;
369 double frames_per_beat_at (const framepos_t&, const framecnt_t& sr) const;
371 const Meter& meter_at (framepos_t) const;
373 const TempoSection& tempo_section_at (framepos_t frame) const;
374 const MeterSection& meter_section_at (framepos_t frame) const;
376 void add_tempo (const Tempo&, const double& pulse, TempoSection::Type type);
377 void add_tempo (const Tempo&, const framepos_t& frame, TempoSection::Type type);
379 void add_meter (const Meter&, const double& beat, const Timecode::BBT_Time& where);
380 void add_meter (const Meter&, const framepos_t& frame);
382 void remove_tempo (const TempoSection&, bool send_signal);
383 void remove_meter (const MeterSection&, bool send_signal);
385 framepos_t predict_tempo_frame (TempoSection* section, const Tempo& bpm, const Timecode::BBT_Time& bbt);
386 double predict_tempo_pulse (TempoSection* section, const Tempo& bpm, const framepos_t& frame);
388 void replace_tempo (const TempoSection&, const Tempo&, const double& where, TempoSection::Type type);
389 void replace_tempo (const TempoSection&, const Tempo&, const framepos_t& frame, TempoSection::Type type);
391 void gui_move_tempo_frame (TempoSection*, const Tempo& bpm, const framepos_t& frame);
392 void gui_move_tempo_beat (TempoSection*, const Tempo& bpm, const double& frame);
393 void gui_move_meter (MeterSection*, const Meter& mt, const framepos_t& frame);
394 void gui_move_meter (MeterSection*, const Meter& mt, const double& beat);
395 bool gui_change_tempo (TempoSection*, const Tempo& bpm);
397 bool can_solve_bbt (TempoSection* section, const Tempo& bpm, const Timecode::BBT_Time& bbt);
399 void replace_meter (const MeterSection&, const Meter&, const Timecode::BBT_Time& where);
400 void replace_meter (const MeterSection&, const Meter&, const framepos_t& frame);
402 framepos_t round_to_bar (framepos_t frame, RoundMode dir);
403 framepos_t round_to_beat (framepos_t frame, RoundMode dir);
404 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir);
406 void set_length (framepos_t frames);
408 XMLNode& get_state (void);
409 int set_state (const XMLNode&, int version);
411 void dump (const Metrics& metrics, std::ostream&) const;
414 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
416 /** Return the TempoMetric at frame @p t, and point @p last to the latest
417 * metric change <= t, if it is non-NULL.
419 TempoMetric metric_at (framepos_t, Metrics::const_iterator* last=NULL) const;
421 Metrics::const_iterator metrics_end() { return _metrics.end(); }
423 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
424 void change_initial_tempo (double bpm, double note_type);
426 void insert_time (framepos_t, framecnt_t);
427 bool remove_time (framepos_t where, framecnt_t amount); //returns true if anything was moved
429 int n_tempos () const;
430 int n_meters () const;
432 framecnt_t frame_rate () const { return _frame_rate; }
434 double bbt_to_beats (const Timecode::BBT_Time& bbt);
435 Timecode::BBT_Time beats_to_bbt (const double& beats);
436 Timecode::BBT_Time pulse_to_bbt (const double& pulse);
438 double pulse_at_beat (const double& beat) const;
439 double beat_at_pulse (const double& pulse) const;
441 PBD::Signal0<void> MetricPositionChanged;
444 double pulse_at_beat_locked (const Metrics& metrics, const double& beat) const;
445 double beat_at_pulse_locked (const Metrics& metrics, const double& pulse) const;
446 double pulse_at_frame_locked (const Metrics& metrics, const framecnt_t& frame) const;
447 framecnt_t frame_at_pulse_locked (const Metrics& metrics, const double& beat) const;
449 double beat_offset_at (const Metrics& metrics, const double& beat) const;
450 frameoffset_t frame_offset_at (const Metrics& metrics, const framepos_t& frame) const;
452 double beat_at_frame_locked (const Metrics& metrics, const framecnt_t& frame) const;
453 framecnt_t frame_at_beat_locked (const Metrics& metrics, const double& beat) const;
454 double bbt_to_beats_locked (const Metrics& metrics, const Timecode::BBT_Time& bbt) const ;
455 Timecode::BBT_Time beats_to_bbt_locked (const Metrics& metrics, const double& beats) const;
457 framepos_t frame_time_locked (const Metrics& metrics, const Timecode::BBT_Time&) const;
459 const MeterSection& meter_section_at_locked (framepos_t frame) const;
460 const TempoSection& tempo_section_at_locked (framepos_t frame) const;
462 bool check_solved (Metrics& metrics, bool by_frame);
463 bool solve_map (Metrics& metrics, TempoSection* section, const Tempo& bpm, const framepos_t& frame);
464 bool solve_map (Metrics& metrics, TempoSection* section, const Tempo& bpm, const double& pulse);
465 void solve_map (Metrics& metrics, MeterSection* section, const Meter& mt, const framepos_t& frame);
466 void solve_map (Metrics& metrics, MeterSection* section, const Meter& mt, const double& pulse);
468 friend class ::BBTTest;
469 friend class ::FrameposPlusBeatsTest;
470 friend class ::TempoTest;
472 static Tempo _default_tempo;
473 static Meter _default_meter;
476 framecnt_t _frame_rate;
477 mutable Glib::Threads::RWLock lock;
479 void recompute_tempos (Metrics& metrics);
480 void recompute_meters (Metrics& metrics);
481 void recompute_map (Metrics& metrics, framepos_t end = -1);
483 framepos_t round_to_type (framepos_t fr, RoundMode dir, BBTPointType);
485 const MeterSection& first_meter() const;
486 MeterSection& first_meter();
487 const TempoSection& first_tempo() const;
488 TempoSection& first_tempo();
490 void do_insert (MetricSection* section);
492 void add_tempo_locked (const Tempo&, double pulse, bool recompute, TempoSection::Type type);
493 void add_tempo_locked (const Tempo&, framepos_t frame, bool recompute, TempoSection::Type type);
495 void add_meter_locked (const Meter&, double beat, Timecode::BBT_Time where, bool recompute);
496 void add_meter_locked (const Meter&, framepos_t frame, bool recompute);
498 bool remove_tempo_locked (const TempoSection&);
499 bool remove_meter_locked (const MeterSection&);
501 TempoSection* copy_metrics_and_point (Metrics& copy, TempoSection* section);
504 }; /* namespace ARDOUR */
506 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
507 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
508 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
510 #endif /* __ardour_tempo_h__ */