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)
109 : _pulse (pulse), _frame (0), _movable (true), _position_lock_style (PositionLockStyle::MusicTime) {}
110 MetricSection (framepos_t frame)
111 : _pulse (0.0), _frame (frame), _movable (true), _position_lock_style (PositionLockStyle::AudioTime) {}
113 virtual ~MetricSection() {}
115 const double& pulse () const { return _pulse; }
116 void set_pulse (double pulse) { _pulse = pulse; }
118 framepos_t frame() const { return _frame; }
119 virtual void set_frame (framepos_t f) {
123 void set_movable (bool yn) { _movable = yn; }
124 bool movable() const { return _movable; }
126 /* MeterSections are not stateful in the full sense,
127 but we do want them to control their own
128 XML state information.
130 virtual XMLNode& get_state() const = 0;
132 PositionLockStyle position_lock_style () const { return _position_lock_style; }
133 void set_position_lock_style (PositionLockStyle ps) { _position_lock_style = ps; }
139 PositionLockStyle _position_lock_style;
142 /** A section of timeline with a certain Meter. */
143 class LIBARDOUR_API MeterSection : public MetricSection, public Meter {
145 MeterSection (double pulse, double beat, const Timecode::BBT_Time& bbt, double bpb, double note_type)
146 : MetricSection (pulse), Meter (bpb, note_type), _bbt (bbt), _beat (beat) {}
147 MeterSection (framepos_t frame, double beat, double bpb, double note_type)
148 : MetricSection (frame), Meter (bpb, note_type), _bbt (1, 1, 0), _beat (beat) {}
149 MeterSection (const XMLNode&);
151 static const std::string xml_state_node_name;
153 XMLNode& get_state() const;
155 void set_pulse (double w) {
156 MetricSection::set_pulse (w);
158 void set_beat (std::pair<double, Timecode::BBT_Time>& w) {
163 const Timecode::BBT_Time& bbt() const { return _bbt; }
164 const double& beat () const { return _beat; }
165 void set_beat (double beat) { _beat = beat; }
168 Timecode::BBT_Time _bbt;
172 /** A section of timeline with a certain Tempo. */
173 class LIBARDOUR_API TempoSection : public MetricSection, public Tempo {
180 TempoSection (const double& beat, double qpm, double note_type, Type tempo_type)
181 : MetricSection (beat), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type), _c_func (0.0), _active (true) {}
182 TempoSection (framepos_t frame, double qpm, double note_type, Type tempo_type)
183 : MetricSection (frame), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type), _c_func (0.0), _active (true) {}
184 TempoSection (const XMLNode&);
186 static const std::string xml_state_node_name;
188 XMLNode& get_state() const;
190 void update_bar_offset_from_bbt (const Meter&);
191 void update_bbt_time_from_bar_offset (const Meter&);
192 double bar_offset() const { return _bar_offset; }
194 bool active () const { return _active; }
195 void set_active (bool yn) { _active = yn; }
197 void set_type (Type type);
198 Type type () const { return _type; }
200 double tempo_at_frame (const framepos_t& frame, const framecnt_t& frame_rate) const;
201 framepos_t frame_at_tempo (const double& ppm, const double& beat, const framecnt_t& frame_rate) const;
203 double tempo_at_pulse (const double& pulse) const;
204 double pulse_at_tempo (const double& ppm, const framepos_t& frame, const framecnt_t& frame_rate) const;
206 double pulse_at_frame (const framepos_t& frame, const framecnt_t& frame_rate) const;
207 framepos_t frame_at_pulse (const double& pulse, const framecnt_t& frame_rate) const;
209 double compute_c_func_pulse (const double& end_bpm, const double& end_pulse, const framecnt_t& frame_rate);
210 double compute_c_func_frame (const double& end_bpm, const framepos_t& end_frame, const framecnt_t& frame_rate) const;
212 double get_c_func () const { return _c_func; }
213 void set_c_func (double c_func) { _c_func = c_func; }
215 Timecode::BBT_Time legacy_bbt () { return _legacy_bbt; }
219 framecnt_t minute_to_frame (const double& time, const framecnt_t& frame_rate) const;
220 double frame_to_minute (const framecnt_t& frame, const framecnt_t& frame_rate) const;
222 /* tempo ramp functions. zero-based with time in minutes,
223 * 'tick tempo' in ticks per minute and tempo in bpm.
224 * time relative to section start.
226 double a_func (double end_tpm, double c_func) const;
227 double c_func (double end_tpm, double end_time) const;
229 double pulse_tempo_at_time (const double& time) const;
230 double time_at_pulse_tempo (const double& pulse_tempo) const;
232 double pulse_tempo_at_pulse (const double& pulse) const;
233 double pulse_at_pulse_tempo (const double& pulse_tempo) const;
235 double pulse_at_time (const double& time) const;
236 double time_at_pulse (const double& pulse) const;
238 /* this value provides a fractional offset into the bar in which
239 the tempo section is located in. A value of 0.0 indicates that
240 it occurs on the first beat of the bar, a value of 0.5 indicates
241 that it occurs halfway through the bar and so on.
243 this enables us to keep the tempo change at the same relative
244 position within the bar if/when the meter changes.
250 Timecode::BBT_Time _legacy_bbt;
253 typedef std::list<MetricSection*> Metrics;
255 /** Helper class to keep track of the Meter *AND* Tempo in effect
256 at a given point in time.
258 class LIBARDOUR_API TempoMetric {
260 TempoMetric (const Meter& m, const Tempo& t)
261 : _meter (&m), _tempo (&t), _frame (0) {}
263 void set_tempo (const Tempo& t) { _tempo = &t; }
264 void set_meter (const Meter& m) { _meter = &m; }
265 void set_frame (framepos_t f) { _frame = f; }
266 void set_pulse (const double& p) { _pulse = p; }
268 void set_metric (const MetricSection* section) {
269 const MeterSection* meter;
270 const TempoSection* tempo;
271 if ((meter = dynamic_cast<const MeterSection*>(section))) {
273 } else if ((tempo = dynamic_cast<const TempoSection*>(section))) {
277 set_frame (section->frame());
278 set_pulse (section->pulse());
281 const Meter& meter() const { return *_meter; }
282 const Tempo& tempo() const { return *_tempo; }
283 framepos_t frame() const { return _frame; }
284 const double& pulse() const { return _pulse; }
293 /** Tempo Map - mapping of timecode to musical time.
294 * convert audio-samples, sample-rate to Bar/Beat/Tick, Meter/Tempo
296 class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
299 TempoMap (framecnt_t frame_rate);
302 /* measure-based stuff */
311 const MeterSection* meter;
317 BBTPoint (const MeterSection& m, const Tempo& t, framepos_t f,
318 uint32_t b, uint32_t e, double func_c)
319 : frame (f), meter (&m), tempo (t.beats_per_minute(), t.note_type()), c (func_c), bar (b), beat (e) {}
321 Timecode::BBT_Time bbt() const { return Timecode::BBT_Time (bar, beat, 0); }
322 operator Timecode::BBT_Time() const { return bbt(); }
323 operator framepos_t() const { return frame; }
324 bool is_bar() const { return beat == 1; }
327 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
328 Glib::Threads::RWLock::ReaderLock lm (lock);
329 (obj.*method)(_metrics);
332 void get_grid (std::vector<BBTPoint>&,
333 framepos_t start, framepos_t end);
335 /* TEMPO- AND METER-SENSITIVE FUNCTIONS
337 bbt_time(), beat_at_frame(), frame_at_beat(), tick_at_frame(),
338 frame_at_tick(),frame_time() and bbt_duration_at()
339 are all sensitive to tempo and meter, and will give answers
340 that align with the grid formed by tempo and meter sections.
342 They SHOULD NOT be used to determine the position of events
343 whose location is canonically defined in beats.
346 void bbt_time (framepos_t when, Timecode::BBT_Time&);
348 double beat_at_frame (const framecnt_t& frame) const;
349 framecnt_t frame_at_beat (const double& beat) const;
351 framepos_t frame_time (const Timecode::BBT_Time&);
352 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir);
354 /* TEMPO-SENSITIVE FUNCTIONS
356 These next 4 functions will all take tempo in account and should be
357 used to determine position (and in the last case, distance in beats)
358 when tempo matters but meter does not.
360 They SHOULD be used to determine the position of events
361 whose location is canonically defined in beats.
364 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
365 framepos_t framepos_plus_beats (framepos_t, Evoral::Beats) const;
366 framepos_t framepos_minus_beats (framepos_t, Evoral::Beats) const;
367 Evoral::Beats framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
369 static const Tempo& default_tempo() { return _default_tempo; }
370 static const Meter& default_meter() { return _default_meter; }
372 const Tempo tempo_at (const framepos_t& frame) const;
373 double frames_per_beat_at (const framepos_t&, const framecnt_t& sr) const;
375 const Meter& meter_at (framepos_t) const;
377 const TempoSection& tempo_section_at (framepos_t frame) const;
378 const MeterSection& meter_section_at (framepos_t frame) const;
379 const MeterSection& meter_section_at (const double& beat) const;
381 void add_tempo (const Tempo&, const double& pulse, TempoSection::Type type);
382 void add_tempo (const Tempo&, const framepos_t& frame, TempoSection::Type type);
384 void add_meter (const Meter&, const double& beat, const Timecode::BBT_Time& where);
385 void add_meter (const Meter&, const framepos_t& frame);
387 void remove_tempo (const TempoSection&, bool send_signal);
388 void remove_meter (const MeterSection&, bool send_signal);
390 framepos_t predict_tempo_frame (TempoSection* section, const Tempo& bpm, const Timecode::BBT_Time& bbt);
391 double predict_tempo_pulse (TempoSection* section, const Tempo& bpm, const framepos_t& frame);
393 void replace_tempo (const TempoSection&, const Tempo&, const double& where, TempoSection::Type type);
394 void replace_tempo (const TempoSection&, const Tempo&, const framepos_t& frame, TempoSection::Type type);
396 void gui_move_tempo_frame (TempoSection*, const Tempo& bpm, const framepos_t& frame);
397 void gui_move_tempo_beat (TempoSection*, const Tempo& bpm, const double& frame);
398 void gui_move_meter (MeterSection*, const Meter& mt, const framepos_t& frame);
399 void gui_move_meter (MeterSection*, const Meter& mt, const double& beat);
400 bool gui_change_tempo (TempoSection*, const Tempo& bpm);
402 bool can_solve_bbt (TempoSection* section, const Tempo& bpm, const Timecode::BBT_Time& bbt);
404 void replace_meter (const MeterSection&, const Meter&, const Timecode::BBT_Time& where);
405 void replace_meter (const MeterSection&, const Meter&, const framepos_t& frame);
407 framepos_t round_to_bar (framepos_t frame, RoundMode dir);
408 framepos_t round_to_beat (framepos_t frame, RoundMode dir);
409 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir);
410 void round_bbt (Timecode::BBT_Time& when, const int32_t& snap_divisor);
412 void set_length (framepos_t frames);
414 XMLNode& get_state (void);
415 int set_state (const XMLNode&, int version);
417 void dump (const Metrics& metrics, std::ostream&) const;
420 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
422 /** Return the TempoMetric at frame @p t, and point @p last to the latest
423 * metric change <= t, if it is non-NULL.
425 TempoMetric metric_at (framepos_t, Metrics::const_iterator* last=NULL) const;
427 Metrics::const_iterator metrics_end() { return _metrics.end(); }
429 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
430 void change_initial_tempo (double bpm, double note_type);
432 void insert_time (framepos_t, framecnt_t);
433 bool remove_time (framepos_t where, framecnt_t amount); //returns true if anything was moved
435 int n_tempos () const;
436 int n_meters () const;
438 framecnt_t frame_rate () const { return _frame_rate; }
440 double bbt_to_beats (const Timecode::BBT_Time& bbt);
441 Timecode::BBT_Time beats_to_bbt (const double& beats);
442 Timecode::BBT_Time pulse_to_bbt (const double& pulse);
444 double pulse_at_beat (const double& beat) const;
445 double beat_at_pulse (const double& pulse) const;
447 PBD::Signal0<void> MetricPositionChanged;
450 double pulse_at_beat_locked (const Metrics& metrics, const double& beat) const;
451 double beat_at_pulse_locked (const Metrics& metrics, const double& pulse) const;
452 double pulse_at_frame_locked (const Metrics& metrics, const framecnt_t& frame) const;
453 framecnt_t frame_at_pulse_locked (const Metrics& metrics, const double& beat) const;
455 double beat_offset_at (const Metrics& metrics, const double& beat) const;
456 frameoffset_t frame_offset_at (const Metrics& metrics, const framepos_t& frame) const;
458 double beat_at_frame_locked (const Metrics& metrics, const framecnt_t& frame) const;
459 framecnt_t frame_at_beat_locked (const Metrics& metrics, const double& beat) const;
460 double bbt_to_beats_locked (const Metrics& metrics, const Timecode::BBT_Time& bbt) const ;
461 Timecode::BBT_Time beats_to_bbt_locked (const Metrics& metrics, const double& beats) const;
463 framepos_t frame_time_locked (const Metrics& metrics, const Timecode::BBT_Time&) const;
465 const MeterSection& meter_section_at_locked (framepos_t frame) const;
466 const TempoSection& tempo_section_at_locked (framepos_t frame) const;
467 const Tempo tempo_at_locked (const framepos_t& frame) const;
469 bool check_solved (Metrics& metrics, bool by_frame);
470 bool solve_map (Metrics& metrics, TempoSection* section, const Tempo& bpm, const framepos_t& frame);
471 bool solve_map (Metrics& metrics, TempoSection* section, const Tempo& bpm, const double& pulse);
472 void solve_map (Metrics& metrics, MeterSection* section, const Meter& mt, const framepos_t& frame);
473 void solve_map (Metrics& metrics, MeterSection* section, const Meter& mt, const double& pulse);
475 friend class ::BBTTest;
476 friend class ::FrameposPlusBeatsTest;
477 friend class ::TempoTest;
479 static Tempo _default_tempo;
480 static Meter _default_meter;
483 framecnt_t _frame_rate;
484 mutable Glib::Threads::RWLock lock;
486 void recompute_tempos (Metrics& metrics);
487 void recompute_meters (Metrics& metrics);
488 void recompute_map (Metrics& metrics, framepos_t end = -1);
490 framepos_t round_to_type (framepos_t fr, RoundMode dir, BBTPointType);
492 const MeterSection& first_meter() const;
493 MeterSection& first_meter();
494 const TempoSection& first_tempo() const;
495 TempoSection& first_tempo();
497 void do_insert (MetricSection* section);
499 void add_tempo_locked (const Tempo&, double pulse, bool recompute, TempoSection::Type type);
500 void add_tempo_locked (const Tempo&, framepos_t frame, bool recompute, TempoSection::Type type);
502 void add_meter_locked (const Meter&, double beat, Timecode::BBT_Time where, bool recompute);
503 void add_meter_locked (const Meter&, framepos_t frame, bool recompute);
505 bool remove_tempo_locked (const TempoSection&);
506 bool remove_meter_locked (const MeterSection&);
508 TempoSection* copy_metrics_and_point (Metrics& copy, TempoSection* section);
511 }; /* namespace ARDOUR */
513 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
514 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
515 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
517 #endif /* __ardour_tempo_h__ */