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 double note_type () const { return _note_type; }
60 double pulses_per_minute () const { return _beats_per_minute / _note_type; }
61 /** audio samples per beat
62 * @param sr samplerate
64 double frames_per_beat (framecnt_t sr) const {
65 return (60.0 * sr) / _beats_per_minute;
67 double frames_per_pulse (framecnt_t sr) const {
68 return (_note_type * 60.0 * sr) / _beats_per_minute;
72 double _beats_per_minute;
76 /** Meter, or time signature (beats per bar, and which note type is a beat). */
77 class LIBARDOUR_API Meter {
79 Meter (double dpb, double bt)
80 : _divisions_per_bar (dpb), _note_type (bt) {}
82 double divisions_per_bar () const { return _divisions_per_bar; }
83 double note_divisor() const { return _note_type; }
85 double frames_per_bar (const Tempo&, framecnt_t sr) const;
86 double frames_per_grid (const Tempo&, framecnt_t sr) const;
89 /** The number of divisions in a bar. This is a floating point value because
90 there are musical traditions on our planet that do not limit
91 themselves to integral numbers of beats per bar.
93 double _divisions_per_bar;
95 /** The type of "note" that a division represents. For example, 4.0 is
96 a quarter (crotchet) note, 8.0 is an eighth (quaver) note, etc.
101 /** A section of timeline with a certain Tempo or Meter. */
102 class LIBARDOUR_API MetricSection {
104 MetricSection (double pulse)
105 : _pulse (pulse), _frame (0), _movable (true), _position_lock_style (PositionLockStyle::MusicTime) {}
106 MetricSection (framepos_t frame)
107 : _pulse (0.0), _frame (frame), _movable (true), _position_lock_style (PositionLockStyle::AudioTime) {}
109 virtual ~MetricSection() {}
111 const double& pulse () const { return _pulse; }
112 void set_pulse (double pulse) { _pulse = pulse; }
114 framepos_t frame() const { return _frame; }
115 virtual void set_frame (framepos_t f) {
119 void set_movable (bool yn) { _movable = yn; }
120 bool movable() const { return _movable; }
122 /* MeterSections are not stateful in the full sense,
123 but we do want them to control their own
124 XML state information.
126 virtual XMLNode& get_state() const = 0;
128 PositionLockStyle position_lock_style () const { return _position_lock_style; }
129 void set_position_lock_style (PositionLockStyle ps) { _position_lock_style = ps; }
135 PositionLockStyle _position_lock_style;
138 /** A section of timeline with a certain Meter. */
139 class LIBARDOUR_API MeterSection : public MetricSection, public Meter {
141 MeterSection (double beat, const Timecode::BBT_Time& bbt, double bpb, double note_type)
142 : MetricSection (beat), Meter (bpb, note_type), _bbt (bbt) {}
143 MeterSection (framepos_t frame, double bpb, double note_type)
144 : MetricSection (frame), Meter (bpb, note_type), _bbt (1, 1, 0) {}
145 MeterSection (const XMLNode&);
147 static const std::string xml_state_node_name;
149 XMLNode& get_state() const;
151 void set_pulse (std::pair<double, Timecode::BBT_Time>& w) {
152 MetricSection::set_pulse (w.first);
156 const Timecode::BBT_Time& bbt() const { return _bbt; }
157 const double& beat () const { return _beat; }
158 void set_beat (double beat) { _beat = beat; }
161 Timecode::BBT_Time _bbt;
165 /** A section of timeline with a certain Tempo. */
166 class LIBARDOUR_API TempoSection : public MetricSection, public Tempo {
173 TempoSection (const double& beat, double qpm, double note_type, Type tempo_type)
174 : MetricSection (beat), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type), _c_func (0.0) {}
175 TempoSection (framepos_t frame, double qpm, double note_type, Type tempo_type)
176 : MetricSection (frame), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type), _c_func (0.0) {}
177 TempoSection (const XMLNode&);
179 static const std::string xml_state_node_name;
181 XMLNode& get_state() const;
183 void update_bar_offset_from_bbt (const Meter&);
184 void update_bbt_time_from_bar_offset (const Meter&);
185 double bar_offset() const { return _bar_offset; }
187 void set_type (Type type);
188 Type type () const { return _type; }
190 double tempo_at_frame (const framepos_t& frame, const framecnt_t& frame_rate) const;
191 framepos_t frame_at_tempo (const double& ppm, const double& beat, const framecnt_t& frame_rate) const;
193 double tempo_at_pulse (const double& pulse) const;
194 double pulse_at_tempo (const double& ppm, const framepos_t& frame, const framecnt_t& frame_rate) const;
196 double pulse_at_frame (const framepos_t& frame, const framecnt_t& frame_rate) const;
197 framepos_t frame_at_pulse (const double& pulse, const framecnt_t& frame_rate) const;
199 double compute_c_func_pulse (const double& end_bpm, const double& end_pulse, const framecnt_t& frame_rate);
200 double compute_c_func_frame (const double& end_bpm, const framepos_t& end_frame, const framecnt_t& frame_rate) const;
202 double get_c_func () const { return _c_func; }
203 void set_c_func (double c_func) { _c_func = c_func; }
205 Timecode::BBT_Time legacy_bbt () { return _legacy_bbt; }
209 framecnt_t minute_to_frame (const double& time, const framecnt_t& frame_rate) const;
210 double frame_to_minute (const framecnt_t& frame, const framecnt_t& frame_rate) const;
212 /* tempo ramp functions. zero-based with time in minutes,
213 * 'tick tempo' in ticks per minute and tempo in bpm.
214 * time relative to section start.
216 double a_func (double end_tpm, double c_func) const;
217 double c_func (double end_tpm, double end_time) const;
219 double pulse_tempo_at_time (const double& time) const;
220 double time_at_pulse_tempo (const double& pulse_tempo) const;
222 double pulse_tempo_at_pulse (const double& pulse) const;
223 double pulse_at_pulse_tempo (const double& pulse_tempo) const;
225 double pulse_at_time (const double& time) const;
226 double time_at_pulse (const double& pulse) const;
228 /* this value provides a fractional offset into the bar in which
229 the tempo section is located in. A value of 0.0 indicates that
230 it occurs on the first beat of the bar, a value of 0.5 indicates
231 that it occurs halfway through the bar and so on.
233 this enables us to keep the tempo change at the same relative
234 position within the bar if/when the meter changes.
239 Timecode::BBT_Time _legacy_bbt;
242 typedef std::list<MetricSection*> Metrics;
244 /** Helper class to keep track of the Meter *AND* Tempo in effect
245 at a given point in time.
247 class LIBARDOUR_API TempoMetric {
249 TempoMetric (const Meter& m, const Tempo& t)
250 : _meter (&m), _tempo (&t), _frame (0) {}
252 void set_tempo (const Tempo& t) { _tempo = &t; }
253 void set_meter (const Meter& m) { _meter = &m; }
254 void set_frame (framepos_t f) { _frame = f; }
255 void set_pulse (const double& p) { _pulse = p; }
257 void set_metric (const MetricSection* section) {
258 const MeterSection* meter;
259 const TempoSection* tempo;
260 if ((meter = dynamic_cast<const MeterSection*>(section))) {
262 } else if ((tempo = dynamic_cast<const TempoSection*>(section))) {
266 set_frame (section->frame());
267 set_pulse (section->pulse());
270 const Meter& meter() const { return *_meter; }
271 const Tempo& tempo() const { return *_tempo; }
272 framepos_t frame() const { return _frame; }
273 const double& pulse() const { return _pulse; }
282 /** Tempo Map - mapping of timecode to musical time.
283 * convert audio-samples, sample-rate to Bar/Beat/Tick, Meter/Tempo
285 class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
288 TempoMap (framecnt_t frame_rate);
291 /* measure-based stuff */
300 const MeterSection* meter;
305 BBTPoint (const MeterSection& m, const Tempo& t, framepos_t f,
306 uint32_t b, uint32_t e)
307 : frame (f), meter (&m), tempo (t.beats_per_minute(), t.note_type()), bar (b), beat (e) {}
309 Timecode::BBT_Time bbt() const { return Timecode::BBT_Time (bar, beat, 0); }
310 operator Timecode::BBT_Time() const { return bbt(); }
311 operator framepos_t() const { return frame; }
312 bool is_bar() const { return beat == 1; }
315 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
316 Glib::Threads::RWLock::ReaderLock lm (lock);
317 (obj.*method)(_metrics);
320 void get_grid (std::vector<BBTPoint>&,
321 framepos_t start, framepos_t end);
323 /* TEMPO- AND METER-SENSITIVE FUNCTIONS
325 bbt_time(), beat_at_frame(), frame_at_beat(), tick_at_frame(),
326 frame_at_tick(),frame_time() and bbt_duration_at()
327 are all sensitive to tempo and meter, and will give answers
328 that align with the grid formed by tempo and meter sections.
330 They SHOULD NOT be used to determine the position of events
331 whose location is canonically defined in beats.
334 void bbt_time (framepos_t when, Timecode::BBT_Time&);
336 double beat_at_frame (const framecnt_t& frame) const;
337 framecnt_t frame_at_beat (const double& beat) const;
339 framepos_t frame_time (const Timecode::BBT_Time&);
340 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir);
342 /* TEMPO-SENSITIVE FUNCTIONS
344 These next 4 functions will all take tempo in account and should be
345 used to determine position (and in the last case, distance in beats)
346 when tempo matters but meter does not.
348 They SHOULD be used to determine the position of events
349 whose location is canonically defined in beats.
352 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
353 framepos_t framepos_plus_beats (framepos_t, Evoral::Beats) const;
354 framepos_t framepos_minus_beats (framepos_t, Evoral::Beats) const;
355 Evoral::Beats framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
357 static const Tempo& default_tempo() { return _default_tempo; }
358 static const Meter& default_meter() { return _default_meter; }
360 const Tempo tempo_at (const framepos_t& frame) const;
361 double frames_per_beat_at (const framepos_t&, const framecnt_t& sr) const;
363 const Meter& meter_at (framepos_t) const;
365 const TempoSection& tempo_section_at (framepos_t frame) const;
366 const MeterSection& meter_section_at (framepos_t frame) const;
368 void add_tempo (const Tempo&, const double& pulse, TempoSection::Type type);
369 void add_tempo (const Tempo&, const framepos_t& frame, TempoSection::Type type);
371 void add_meter (const Meter&, const double& beat, const Timecode::BBT_Time& where);
372 void add_meter (const Meter&, const framepos_t& frame);
374 void remove_tempo (const TempoSection&, bool send_signal);
375 void remove_meter (const MeterSection&, bool send_signal);
377 framepos_t predict_tempo_frame (TempoSection* section, const Tempo& bpm, const Timecode::BBT_Time& bbt);
378 double predict_tempo_pulse (TempoSection* section, const Tempo& bpm, const framepos_t& frame);
380 void replace_tempo (const TempoSection&, const Tempo&, const double& where, TempoSection::Type type);
381 void replace_tempo (const TempoSection&, const Tempo&, const framepos_t& frame, TempoSection::Type type);
383 void gui_move_tempo_frame (TempoSection*, const Tempo& bpm, const framepos_t& frame);
384 void gui_move_tempo_beat (TempoSection*, const Tempo& bpm, const double& frame);
385 void gui_move_meter (MeterSection*, const Meter& mt, const framepos_t& frame);
386 void gui_move_meter (MeterSection*, const Meter& mt, const double& beat);
388 bool can_solve_bbt (TempoSection* section, const Tempo& bpm, const Timecode::BBT_Time& bbt);
390 void replace_meter (const MeterSection&, const Meter&, const Timecode::BBT_Time& where);
391 void replace_meter (const MeterSection&, const Meter&, const framepos_t& frame);
393 framepos_t round_to_bar (framepos_t frame, RoundMode dir);
394 framepos_t round_to_beat (framepos_t frame, RoundMode dir);
395 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir);
397 void set_length (framepos_t frames);
399 XMLNode& get_state (void);
400 int set_state (const XMLNode&, int version);
402 void dump (const Metrics& metrics, std::ostream&) const;
405 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
407 /** Return the TempoMetric at frame @p t, and point @p last to the latest
408 * metric change <= t, if it is non-NULL.
410 TempoMetric metric_at (framepos_t, Metrics::const_iterator* last=NULL) const;
412 Metrics::const_iterator metrics_end() { return _metrics.end(); }
414 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
415 void change_initial_tempo (double bpm, double note_type);
417 void insert_time (framepos_t, framecnt_t);
418 bool remove_time (framepos_t where, framecnt_t amount); //returns true if anything was moved
420 int n_tempos () const;
421 int n_meters () const;
423 framecnt_t frame_rate () const { return _frame_rate; }
425 double bbt_to_beats (const Timecode::BBT_Time& bbt);
426 Timecode::BBT_Time beats_to_bbt (const double& beats);
427 Timecode::BBT_Time pulse_to_bbt (const double& pulse);
429 double pulse_at_beat (const double& beat) const;
430 double beat_at_pulse (const double& pulse) const;
432 PBD::Signal0<void> MetricPositionChanged;
435 double pulse_at_beat_locked (const Metrics& metrics, const double& beat) const;
436 double beat_at_pulse_locked (const Metrics& metrics, const double& pulse) const;
437 double pulse_at_frame_locked (const Metrics& metrics, const framecnt_t& frame) const;
438 framecnt_t frame_at_pulse_locked (const Metrics& metrics, const double& beat) const;
440 double pulse_offset_at (const Metrics& metrics, const double& pulse) const;
441 frameoffset_t frame_offset_at (const Metrics& metrics, const framepos_t& frame) const;
443 double beat_at_frame_locked (const Metrics& metrics, const framecnt_t& frame) const;
444 framecnt_t frame_at_beat_locked (const Metrics& metrics, const double& beat) const;
445 double bbt_to_beats_locked (const Metrics& metrics, const Timecode::BBT_Time& bbt) const ;
446 Timecode::BBT_Time beats_to_bbt_locked (const Metrics& metrics, const double& beats) const;
448 framepos_t frame_time_locked (const Metrics& metrics, const Timecode::BBT_Time&) const;
450 const MeterSection& meter_section_at_locked (framepos_t frame) const;
451 const TempoSection& tempo_section_at_locked (framepos_t frame) const;
453 bool check_solved (Metrics& metrics, bool by_frame);
454 bool solve_map (Metrics& metrics, TempoSection* section, const Tempo& bpm, const framepos_t& frame);
455 bool solve_map (Metrics& metrics, TempoSection* section, const Tempo& bpm, const double& pulse);
456 void solve_map (Metrics& metrics, MeterSection* section, const Meter& mt, const framepos_t& frame);
457 void solve_map (Metrics& metrics, MeterSection* section, const Meter& mt, const double& pulse);
459 friend class ::BBTTest;
460 friend class ::FrameposPlusBeatsTest;
461 friend class ::TempoTest;
463 static Tempo _default_tempo;
464 static Meter _default_meter;
467 framecnt_t _frame_rate;
468 mutable Glib::Threads::RWLock lock;
470 void recompute_tempos (Metrics& metrics);
471 void recompute_meters (Metrics& metrics);
472 void recompute_map (Metrics& metrics, framepos_t end = -1);
474 framepos_t round_to_type (framepos_t fr, RoundMode dir, BBTPointType);
476 const MeterSection& first_meter() const;
477 MeterSection& first_meter();
478 const TempoSection& first_tempo() const;
479 TempoSection& first_tempo();
481 void do_insert (MetricSection* section);
483 void add_tempo_locked (const Tempo&, double pulse, bool recompute, TempoSection::Type type);
484 void add_tempo_locked (const Tempo&, framepos_t frame, bool recompute, TempoSection::Type type);
486 void add_meter_locked (const Meter&, double beat, Timecode::BBT_Time where, bool recompute);
487 void add_meter_locked (const Meter&, framepos_t frame, bool recompute);
489 bool remove_tempo_locked (const TempoSection&);
490 bool remove_meter_locked (const MeterSection&);
492 TempoSection* copy_metrics_and_point (Metrics& copy, TempoSection* section);
495 }; /* namespace ARDOUR */
497 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
498 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
499 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
501 #endif /* __ardour_tempo_h__ */