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 /* ..or more aptly 'pulse divisions per minute'.
59 Nothing to do with actual beats, which are defined by the meter and tempo.
61 double beats_per_minute () const { return _beats_per_minute; }
62 void set_beats_per_minute (double bpm) { _beats_per_minute = bpm; }
63 double note_type () const { return _note_type; }
64 double pulses_per_minute () const { return _beats_per_minute / _note_type; }
65 /** audio samples per beat
66 * @param sr samplerate
68 double frames_per_beat (framecnt_t sr) const {
69 return (60.0 * sr) / _beats_per_minute;
71 double frames_per_pulse (framecnt_t sr) const {
72 return (_note_type * 60.0 * sr) / _beats_per_minute;
76 double _beats_per_minute;
80 /** Meter, or time signature (beats per bar, and which note type is a beat). */
81 class LIBARDOUR_API Meter {
83 Meter (double dpb, double bt)
84 : _divisions_per_bar (dpb), _note_type (bt) {}
86 double divisions_per_bar () const { return _divisions_per_bar; }
87 double note_divisor() const { return _note_type; }
89 double frames_per_bar (const Tempo&, framecnt_t sr) const;
90 double frames_per_grid (const Tempo&, framecnt_t sr) const;
93 /** The number of divisions in a bar. This is a floating point value because
94 there are musical traditions on our planet that do not limit
95 themselves to integral numbers of beats per bar.
97 double _divisions_per_bar;
99 /** The type of "note" that a division represents. For example, 4.0 is
100 a quarter (crotchet) note, 8.0 is an eighth (quaver) note, etc.
105 /** A section of timeline with a certain Tempo or Meter. */
106 class LIBARDOUR_API MetricSection {
108 MetricSection (double pulse, framepos_t frame, PositionLockStyle pls, bool is_tempo)
109 : _pulse (pulse), _frame (frame), _movable (true), _position_lock_style (pls), _is_tempo (is_tempo) {}
111 virtual ~MetricSection() {}
113 const double& pulse () const { return _pulse; }
114 void set_pulse (double pulse) { _pulse = pulse; }
116 framepos_t frame() const { return _frame; }
117 virtual void set_frame (framepos_t f) {
121 void set_movable (bool yn) { _movable = yn; }
122 bool movable() const { return _movable; }
124 /* MeterSections are not stateful in the full sense,
125 but we do want them to control their own
126 XML state information.
128 virtual XMLNode& get_state() const = 0;
130 PositionLockStyle position_lock_style () const { return _position_lock_style; }
131 void set_position_lock_style (PositionLockStyle ps) { _position_lock_style = ps; }
132 const bool is_tempo () const { return _is_tempo; }
138 PositionLockStyle _position_lock_style;
139 const bool _is_tempo;
142 /** A section of timeline with a certain Meter. */
143 class LIBARDOUR_API MeterSection : public MetricSection, public Meter {
145 MeterSection (double pulse, framepos_t frame, double beat, const Timecode::BBT_Time& bbt, double bpb, double note_type, PositionLockStyle pls)
146 : MetricSection (pulse, frame, pls, false), Meter (bpb, note_type), _bbt (bbt), _beat (beat) {}
148 MeterSection (const XMLNode&);
150 static const std::string xml_state_node_name;
152 XMLNode& get_state() const;
154 void set_beat (std::pair<double, Timecode::BBT_Time>& w) {
159 const Timecode::BBT_Time& bbt() const { return _bbt; }
160 const double& beat () const { return _beat; }
161 void set_beat (double beat) { _beat = beat; }
164 Timecode::BBT_Time _bbt;
168 /** A section of timeline with a certain Tempo. */
169 class LIBARDOUR_API TempoSection : public MetricSection, public Tempo {
176 TempoSection (const double& pulse, const framepos_t& frame, double qpm, double note_type, Type tempo_type, PositionLockStyle pls)
177 : MetricSection (pulse, frame, pls, true), Tempo (qpm, note_type), _type (tempo_type), _c_func (0.0), _active (true), _locked_to_meter (false) {}
179 TempoSection (const XMLNode&);
181 static const std::string xml_state_node_name;
183 XMLNode& get_state() const;
185 double c_func () const { return _c_func; }
186 void set_c_func (double c_func) { _c_func = c_func; }
188 void set_type (Type type);
189 Type type () const { return _type; }
191 bool active () const { return _active; }
192 void set_active (bool yn) { _active = yn; }
194 bool locked_to_meter () const { return _locked_to_meter; }
195 void set_locked_to_meter (bool yn) { _locked_to_meter = yn; }
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 framepos_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 Timecode::BBT_Time legacy_bbt () { return _legacy_bbt; }
213 framepos_t minute_to_frame (const double& time, const framecnt_t& frame_rate) const;
214 double frame_to_minute (const framepos_t& frame, const framecnt_t& frame_rate) const;
216 /* tempo ramp functions. zero-based with time in minutes,
217 * 'tick tempo' in ticks per minute and tempo in bpm.
218 * time relative to section start.
220 double a_func (double end_tpm, double c_func) const;
221 double c_func (double end_tpm, double end_time) const;
223 double pulse_tempo_at_time (const double& time) const;
224 double time_at_pulse_tempo (const double& pulse_tempo) const;
226 double pulse_tempo_at_pulse (const double& pulse) const;
227 double pulse_at_pulse_tempo (const double& pulse_tempo) const;
229 double pulse_at_time (const double& time) const;
230 double time_at_pulse (const double& pulse) const;
232 /* this value provides a fractional offset into the bar in which
233 the tempo section is located in. A value of 0.0 indicates that
234 it occurs on the first beat of the bar, a value of 0.5 indicates
235 that it occurs halfway through the bar and so on.
237 this enables us to keep the tempo change at the same relative
238 position within the bar if/when the meter changes.
243 bool _locked_to_meter;
244 Timecode::BBT_Time _legacy_bbt;
247 typedef std::list<MetricSection*> Metrics;
249 /** Helper class to keep track of the Meter *AND* Tempo in effect
250 at a given point in time.
252 class LIBARDOUR_API TempoMetric {
254 TempoMetric (const Meter& m, const Tempo& t)
255 : _meter (&m), _tempo (&t), _frame (0) {}
257 void set_tempo (const Tempo& t) { _tempo = &t; }
258 void set_meter (const Meter& m) { _meter = &m; }
259 void set_frame (framepos_t f) { _frame = f; }
260 void set_pulse (const double& p) { _pulse = p; }
262 void set_metric (const MetricSection* section) {
263 const MeterSection* meter;
264 const TempoSection* tempo;
265 if ((meter = dynamic_cast<const MeterSection*>(section))) {
267 } else if ((tempo = dynamic_cast<const TempoSection*>(section))) {
271 set_frame (section->frame());
272 set_pulse (section->pulse());
275 const Meter& meter() const { return *_meter; }
276 const Tempo& tempo() const { return *_tempo; }
277 framepos_t frame() const { return _frame; }
278 const double& pulse() const { return _pulse; }
287 /** Tempo Map - mapping of timecode to musical time.
288 * convert audio-samples, sample-rate to Bar/Beat/Tick, Meter/Tempo
290 class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
293 TempoMap (framecnt_t frame_rate);
296 /* measure-based stuff */
311 BBTPoint (const MeterSection& m, const Tempo& t, framepos_t f,
312 uint32_t b, uint32_t e, double func_c)
313 : frame (f), meter (m.divisions_per_bar(), m.note_divisor()), tempo (t.beats_per_minute(), t.note_type()), c (func_c), bar (b), beat (e) {}
315 Timecode::BBT_Time bbt() const { return Timecode::BBT_Time (bar, beat, 0); }
316 operator Timecode::BBT_Time() const { return bbt(); }
317 operator framepos_t() const { return frame; }
318 bool is_bar() const { return beat == 1; }
321 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
322 Glib::Threads::RWLock::ReaderLock lm (lock);
323 (obj.*method)(_metrics);
326 void get_grid (std::vector<BBTPoint>&,
327 framepos_t start, framepos_t end);
329 static const Tempo& default_tempo() { return _default_tempo; }
330 static const Meter& default_meter() { return _default_meter; }
332 /* because tempos may be ramped, this is only valid for the instant requested.*/
333 double frames_per_beat_at (const framepos_t&, const framecnt_t& sr) const;
335 const TempoSection& tempo_section_at_frame (framepos_t frame) const;
336 const MeterSection& meter_section_at_frame (framepos_t frame) const;
337 const MeterSection& meter_section_at_beat (double beat) const;
339 /** add a tempo section locked to pls. ignored values will be set in recompute_tempos()
340 * @param pulse pulse position of new section. ignored if pls == AudioTime
341 * @param frame frame position of new section. ignored if pls == MusicTime
342 * @param type type of new tempo section (Ramp, Constant)
344 TempoSection* add_tempo (const Tempo&, const double& pulse, const framepos_t& frame, TempoSection::Type type, PositionLockStyle pls);
346 /** add an meter section locked to pls.. ignored values will be set in recompute_meters()
347 * @param beat beat position of new section
348 * @param where bbt position of new section
349 * @param frame frame position of new section. ignored if pls == MusicTime
351 MeterSection* add_meter (const Meter&, const double& beat, const Timecode::BBT_Time& where, const framepos_t& frame, PositionLockStyle pls);
353 void remove_tempo (const TempoSection&, bool send_signal);
354 void remove_meter (const MeterSection&, bool send_signal);
356 void replace_tempo (const TempoSection&, const Tempo&, const double& pulse, const framepos_t& frame
357 , TempoSection::Type type, PositionLockStyle pls);
359 void replace_meter (const MeterSection&, const Meter&, const Timecode::BBT_Time& where, const framepos_t& frame
360 , PositionLockStyle pls);
362 framepos_t round_to_bar (framepos_t frame, RoundMode dir);
363 framepos_t round_to_beat (framepos_t frame, RoundMode dir);
364 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir);
366 void set_length (framepos_t frames);
368 XMLNode& get_state (void);
369 int set_state (const XMLNode&, int version);
371 void dump (const Metrics& metrics, std::ostream&) const;
374 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
376 /** Return the TempoMetric at frame @p t, and point @p last to the latest
377 * metric change <= t, if it is non-NULL.
379 TempoMetric metric_at (framepos_t, Metrics::const_iterator* last=NULL) const;
381 Metrics::const_iterator metrics_end() { return _metrics.end(); }
383 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
384 void change_initial_tempo (double bpm, double note_type);
386 void insert_time (framepos_t, framecnt_t);
387 bool remove_time (framepos_t where, framecnt_t amount); //returns true if anything was moved
389 int n_tempos () const;
390 int n_meters () const;
392 framecnt_t frame_rate () const { return _frame_rate; }
394 /* TEMPO- AND METER-SENSITIVE FUNCTIONS
396 bbt_at_frame(), frame_at_bbt(), beat_at_frame(), frame_at_beat(), tempo_at_beat()
397 and bbt_duration_at()
398 are all sensitive to tempo and meter, and will give answers
399 that align with the grid formed by tempo and meter sections.
401 They SHOULD NOT be used to determine the position of events
402 whose location is canonically defined in beats.
405 double beat_at_frame (const framecnt_t& frame) const;
406 framepos_t frame_at_beat (const double& beat) const;
408 Tempo tempo_at_frame (const framepos_t& frame) const;
409 framepos_t frame_at_tempo (const Tempo& tempo) const;
411 Tempo tempo_at_beat (const double& beat) const;
413 const Meter& meter_at_frame (framepos_t) const;
415 /* you probably only need to use pulses when moving tempos */
416 double pulse_at_beat (const double& beat) const;
417 double beat_at_pulse (const double& pulse) const;
419 double pulse_at_frame (const framecnt_t& frame) const;
420 framepos_t frame_at_pulse (const double& pulse) const;
422 /* bbt - it's nearly always better to use beats.*/
423 Timecode::BBT_Time bbt_at_frame (framepos_t when);
424 Timecode::BBT_Time bbt_at_frame_rt (framepos_t when);
425 framepos_t frame_at_bbt (const Timecode::BBT_Time&);
427 double beat_at_bbt (const Timecode::BBT_Time& bbt);
428 Timecode::BBT_Time bbt_at_beat (const double& beats);
430 double pulse_at_bbt (const Timecode::BBT_Time& bbt);
431 Timecode::BBT_Time bbt_at_pulse (const double& pulse);
433 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir);
435 /* TEMPO-SENSITIVE FUNCTIONS
437 These next 4 functions will all take tempo in account and should be
438 used to determine position (and in the last case, distance in beats)
439 when tempo matters but meter does not.
441 They SHOULD be used to determine the position of events
442 whose location is canonically defined in beats.
445 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
446 framepos_t framepos_plus_beats (framepos_t, Evoral::Beats) const;
447 framepos_t framepos_minus_beats (framepos_t, Evoral::Beats) const;
448 Evoral::Beats framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
450 void gui_move_tempo (TempoSection*, const framepos_t& frame, const int& sub_num);
451 void gui_move_meter (MeterSection*, const framepos_t& frame);
452 bool gui_change_tempo (TempoSection*, const Tempo& bpm);
453 void gui_dilate_tempo (TempoSection* tempo, const framepos_t& frame, const framepos_t& end_frame, const double& pulse);
455 double exact_beat_at_frame (const framepos_t& frame, const int32_t& sub_num);
457 std::pair<double, framepos_t> predict_tempo_position (TempoSection* section, const Timecode::BBT_Time& bbt);
458 bool can_solve_bbt (TempoSection* section, const Timecode::BBT_Time& bbt);
460 PBD::Signal0<void> MetricPositionChanged;
461 void fix_legacy_session();
465 double beat_at_frame_locked (const Metrics& metrics, const framecnt_t& frame) const;
466 framepos_t frame_at_beat_locked (const Metrics& metrics, const double& beat) const;
468 double pulse_at_beat_locked (const Metrics& metrics, const double& beat) const;
469 double beat_at_pulse_locked (const Metrics& metrics, const double& pulse) const;
471 double pulse_at_frame_locked (const Metrics& metrics, const framepos_t& frame) const;
472 framepos_t frame_at_pulse_locked (const Metrics& metrics, const double& pulse) const;
474 Tempo tempo_at_frame_locked (const Metrics& metrics, const framepos_t& frame) const;
475 framepos_t frame_at_tempo_locked (const Metrics& metrics, const Tempo& tempo) const;
477 Timecode::BBT_Time bbt_at_frame_locked (const Metrics& metrics, const framepos_t& frame) const;
478 framepos_t frame_at_bbt_locked (const Metrics& metrics, const Timecode::BBT_Time&) const;
480 double beat_at_bbt_locked (const Metrics& metrics, const Timecode::BBT_Time& bbt) const ;
481 Timecode::BBT_Time bbt_at_beat_locked (const Metrics& metrics, const double& beats) const;
483 double pulse_at_bbt_locked (const Metrics& metrics, const Timecode::BBT_Time& bbt) const;
484 Timecode::BBT_Time bbt_at_pulse_locked (const Metrics& metrics, const double& pulse) const;
486 const TempoSection& tempo_section_at_frame_locked (const Metrics& metrics, framepos_t frame) const;
487 const TempoSection& tempo_section_at_beat_locked (const Metrics& metrics, const double& beat) const;
489 const MeterSection& meter_section_at_frame_locked (const Metrics& metrics, framepos_t frame) const;
490 const MeterSection& meter_section_at_beat_locked (const Metrics& metrics, const double& beat) const;
492 bool check_solved (const Metrics& metrics) const;
493 bool set_active_tempos (const Metrics& metrics, const framepos_t& frame);
495 bool solve_map_frame (Metrics& metrics, TempoSection* section, const framepos_t& frame);
496 bool solve_map_pulse (Metrics& metrics, TempoSection* section, const double& pulse);
497 bool solve_map_frame (Metrics& metrics, MeterSection* section, const framepos_t& frame);
498 bool solve_map_bbt (Metrics& metrics, MeterSection* section, const Timecode::BBT_Time& bbt);
500 double exact_beat_at_frame_locked (const Metrics& metrics, const framepos_t& frame, const int32_t& sub_num);
502 friend class ::BBTTest;
503 friend class ::FrameposPlusBeatsTest;
504 friend class ::TempoTest;
506 static Tempo _default_tempo;
507 static Meter _default_meter;
510 framecnt_t _frame_rate;
511 mutable Glib::Threads::RWLock lock;
513 void recompute_tempos (Metrics& metrics);
514 void recompute_meters (Metrics& metrics);
515 void recompute_map (Metrics& metrics, framepos_t end = -1);
517 framepos_t round_to_type (framepos_t fr, RoundMode dir, BBTPointType);
519 const MeterSection& first_meter() const;
520 MeterSection& first_meter();
521 const TempoSection& first_tempo() const;
522 TempoSection& first_tempo();
524 void do_insert (MetricSection* section);
526 TempoSection* add_tempo_locked (const Tempo&, double pulse, framepos_t frame
527 , TempoSection::Type type, PositionLockStyle pls, bool recompute, bool locked_to_meter = false);
529 MeterSection* add_meter_locked (const Meter&, double beat, const Timecode::BBT_Time& where, framepos_t frame
530 , PositionLockStyle pls, bool recompute);
532 bool remove_tempo_locked (const TempoSection&);
533 bool remove_meter_locked (const MeterSection&);
535 TempoSection* copy_metrics_and_point (const Metrics& metrics, Metrics& copy, TempoSection* section);
536 MeterSection* copy_metrics_and_point (const Metrics& metrics, Metrics& copy, MeterSection* section);
539 }; /* namespace ARDOUR */
541 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
542 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
543 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
545 #endif /* __ardour_tempo_h__ */