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; }
60 double ticks_per_minute () const { return _beats_per_minute * Timecode::BBT_Time::ticks_per_beat;}
61 double note_type () const { return _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;
70 double _beats_per_minute;
74 /** Meter, or time signature (beats per bar, and which note type is a beat). */
75 class LIBARDOUR_API Meter {
77 Meter (double dpb, double bt)
78 : _divisions_per_bar (dpb), _note_type (bt) {}
80 double divisions_per_bar () const { return _divisions_per_bar; }
81 double note_divisor() const { return _note_type; }
83 double frames_per_bar (const Tempo&, framecnt_t sr) const;
84 double frames_per_grid (const Tempo&, framecnt_t sr) const;
87 /** The number of divisions in a bar. This is a floating point value because
88 there are musical traditions on our planet that do not limit
89 themselves to integral numbers of beats per bar.
91 double _divisions_per_bar;
93 /** The type of "note" that a division represents. For example, 4.0 is
94 a quarter (crotchet) note, 8.0 is an eighth (quaver) note, etc.
99 /** A section of timeline with a certain Tempo or Meter. */
100 class LIBARDOUR_API MetricSection {
102 MetricSection (double beat)
103 : _beat (beat), _frame (0), _movable (true), _position_lock_style (MusicTime) {}
104 MetricSection (framepos_t frame)
105 : _beat (0), _frame (frame), _movable (true), _position_lock_style (MusicTime) {}
107 virtual ~MetricSection() {}
109 const double& beat () const { return _beat; }
110 void set_beat (double beat) { _beat = beat;}
112 framepos_t frame() const { return _frame; }
113 virtual void set_frame (framepos_t f) {
117 void set_movable (bool yn) { _movable = yn; }
118 bool movable() const { return _movable; }
120 /* MeterSections are not stateful in the full sense,
121 but we do want them to control their own
122 XML state information.
124 virtual XMLNode& get_state() const = 0;
126 PositionLockStyle position_lock_style () const { return _position_lock_style; }
127 void set_position_lock_style (PositionLockStyle ps) { _position_lock_style = ps; }
133 PositionLockStyle _position_lock_style;
136 /** A section of timeline with a certain Meter. */
137 class LIBARDOUR_API MeterSection : public MetricSection, public Meter {
139 MeterSection (double beat, const Timecode::BBT_Time& bbt, double bpb, double note_type)
140 : MetricSection (beat), Meter (bpb, note_type), _bbt (bbt) {}
141 MeterSection (framepos_t frame, double bpb, double note_type)
142 : MetricSection (frame), Meter (bpb, note_type) {}
143 MeterSection (const XMLNode&);
145 static const std::string xml_state_node_name;
147 XMLNode& get_state() const;
149 void set_beat (std::pair<double, Timecode::BBT_Time>& w) {
150 MetricSection::set_beat (w.first);
154 const Timecode::BBT_Time& bbt() const { return _bbt; }
156 Timecode::BBT_Time _bbt;
159 /** A section of timeline with a certain Tempo. */
160 class LIBARDOUR_API TempoSection : public MetricSection, public Tempo {
167 TempoSection (const double& beat, double qpm, double note_type, Type tempo_type)
168 : MetricSection (beat), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type), _c_func (0.0) {}
169 TempoSection (framepos_t frame, double qpm, double note_type, Type tempo_type)
170 : MetricSection (frame), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type), _c_func (0.0) {}
171 TempoSection (const XMLNode&);
173 static const std::string xml_state_node_name;
175 XMLNode& get_state() const;
177 void update_bar_offset_from_bbt (const Meter&);
178 void update_bbt_time_from_bar_offset (const Meter&);
179 double bar_offset() const { return _bar_offset; }
181 void set_type (Type type);
182 Type type () const { return _type; }
184 double tempo_at_frame (framepos_t frame, framecnt_t frame_rate) const;
185 framepos_t frame_at_tempo (double tempo, framecnt_t frame_rate) const;
187 double tick_at_frame (framepos_t frame, framecnt_t frame_rate) const;
188 framepos_t frame_at_tick (double tick, framecnt_t frame_rate) const;
190 double beat_at_frame (framepos_t frame, framecnt_t frame_rate) const;
191 framepos_t frame_at_beat (double beat, framecnt_t frame_rate) const;
193 void set_c_func_from_tempo_and_beat (double end_bpm, double end_beat, framecnt_t frame_rate);
194 double compute_c_func (double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
195 double get_c_func () const { return _c_func; }
196 void set_c_func (double c_func) { _c_func = c_func; }
198 Timecode::BBT_Time legacy_bbt () { return _legacy_bbt; }
202 framecnt_t minute_to_frame (double time, framecnt_t frame_rate) const;
203 double frame_to_minute (framecnt_t frame, framecnt_t frame_rate) const;
205 /* tempo ramp functions. zero-based with time in minutes,
206 * 'tick tempo' in ticks per minute and tempo in bpm.
207 * time relative to section start.
209 double a_func (double end_tpm, double c_func) const;
210 double c_func (double end_tpm, double end_time) const;
212 double tick_tempo_at_time (double time) const;
213 double time_at_tick_tempo (double tick_tempo) const;
215 double tick_at_time (double time) const;
216 double time_at_tick (double tick) const;
218 double beat_at_time (double time) const;
219 double time_at_beat (double beat) const;
221 /* this value provides a fractional offset into the bar in which
222 the tempo section is located in. A value of 0.0 indicates that
223 it occurs on the first beat of the bar, a value of 0.5 indicates
224 that it occurs halfway through the bar and so on.
226 this enables us to keep the tempo change at the same relative
227 position within the bar if/when the meter changes.
232 Timecode::BBT_Time _legacy_bbt;
235 typedef std::list<MetricSection*> Metrics;
237 /** Helper class to keep track of the Meter *AND* Tempo in effect
238 at a given point in time.
240 class LIBARDOUR_API TempoMetric {
242 TempoMetric (const Meter& m, const Tempo& t)
243 : _meter (&m), _tempo (&t), _frame (0) {}
245 void set_tempo (const Tempo& t) { _tempo = &t; }
246 void set_meter (const Meter& m) { _meter = &m; }
247 void set_frame (framepos_t f) { _frame = f; }
248 void set_beat (const double& t) { _beat = t; }
250 void set_metric (const MetricSection* section) {
251 const MeterSection* meter;
252 const TempoSection* tempo;
253 if ((meter = dynamic_cast<const MeterSection*>(section))) {
255 } else if ((tempo = dynamic_cast<const TempoSection*>(section))) {
259 set_frame(section->frame());
260 set_beat(section->beat());
263 const Meter& meter() const { return *_meter; }
264 const Tempo& tempo() const { return *_tempo; }
265 framepos_t frame() const { return _frame; }
266 const double& beat() const { return _beat; }
275 /** Tempo Map - mapping of timecode to musical time.
276 * convert audio-samples, sample-rate to Bar/Beat/Tick, Meter/Tempo
278 class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
281 TempoMap (framecnt_t frame_rate);
284 /* measure-based stuff */
293 const MeterSection* meter;
298 BBTPoint (const MeterSection& m, const Tempo& t, framepos_t f,
299 uint32_t b, uint32_t e)
300 : frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
302 Timecode::BBT_Time bbt() const { return Timecode::BBT_Time (bar, beat, 0); }
303 operator Timecode::BBT_Time() const { return bbt(); }
304 operator framepos_t() const { return frame; }
305 bool is_bar() const { return beat == 1; }
308 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
309 Glib::Threads::RWLock::ReaderLock lm (lock);
310 (obj.*method)(metrics);
313 void get_grid (std::vector<BBTPoint>&,
314 framepos_t start, framepos_t end);
316 /* TEMPO- AND METER-SENSITIVE FUNCTIONS
318 bbt_time(), beat_at_frame(), frame_at_beat(), tick_at_frame(),
319 frame_at_tick(),frame_time() and bbt_duration_at()
320 are all sensitive to tempo and meter, and will give answers
321 that align with the grid formed by tempo and meter sections.
323 They SHOULD NOT be used to determine the position of events
324 whose location is canonically defined in beats.
327 void bbt_time (framepos_t when, Timecode::BBT_Time&);
329 double tick_at_frame (framecnt_t frame) const;
330 framecnt_t frame_at_tick (double tick) const;
332 double beat_at_frame (framecnt_t frame) const;
333 framecnt_t frame_at_beat (double beat) const;
335 framepos_t frame_time (const Timecode::BBT_Time&);
336 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir);
338 /* TEMPO-SENSITIVE FUNCTIONS
340 These next 4 functions will all take tempo in account and should be
341 used to determine position (and in the last case, distance in beats)
342 when tempo matters but meter does not.
344 They SHOULD be used to determine the position of events
345 whose location is canonically defined in beats.
348 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
349 framepos_t framepos_plus_beats (framepos_t, Evoral::Beats) const;
350 framepos_t framepos_minus_beats (framepos_t, Evoral::Beats) const;
351 Evoral::Beats framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
353 static const Tempo& default_tempo() { return _default_tempo; }
354 static const Meter& default_meter() { return _default_meter; }
356 const Tempo tempo_at (framepos_t) const;
357 double frames_per_beat_at (framepos_t, framecnt_t sr) const;
359 const Meter& meter_at (framepos_t) const;
361 const TempoSection& tempo_section_at (framepos_t) const;
362 const MeterSection& meter_section_at (framepos_t) const;
364 void add_tempo (const Tempo&, double where, TempoSection::Type type);
365 void add_meter (const Meter&, double beat, Timecode::BBT_Time where);
367 void remove_tempo (const TempoSection&, bool send_signal);
368 void remove_meter (const MeterSection&, bool send_signal);
370 void replace_tempo (const TempoSection&, const Tempo&, const double& where, TempoSection::Type type);
371 void gui_set_tempo_frame (TempoSection&, framepos_t where, double beat);
372 void replace_meter (const MeterSection&, const Meter&, const Timecode::BBT_Time& where);
374 framepos_t round_to_bar (framepos_t frame, RoundMode dir);
375 framepos_t round_to_beat (framepos_t frame, RoundMode dir);
376 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir);
378 void set_length (framepos_t frames);
380 XMLNode& get_state (void);
381 int set_state (const XMLNode&, int version);
383 void dump (std::ostream&) const;
386 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
388 /** Return the TempoMetric at frame @p t, and point @p last to the latest
389 * metric change <= t, if it is non-NULL.
391 TempoMetric metric_at (framepos_t, Metrics::const_iterator* last=NULL) const;
393 Metrics::const_iterator metrics_end() { return metrics.end(); }
395 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
396 void change_initial_tempo (double bpm, double note_type);
398 void insert_time (framepos_t, framecnt_t);
399 bool remove_time (framepos_t where, framecnt_t amount); //returns true if anything was moved
401 int n_tempos () const;
402 int n_meters () const;
404 framecnt_t frame_rate () const { return _frame_rate; }
406 PBD::Signal0<void> MetricPositionChanged;
408 double bbt_to_beats (Timecode::BBT_Time bbt);
409 Timecode::BBT_Time beats_to_bbt (double beats);
412 double bbt_to_beats_locked (Timecode::BBT_Time bbt);
413 Timecode::BBT_Time beats_to_bbt_locked (double beats);
415 friend class ::BBTTest;
416 friend class ::FrameposPlusBeatsTest;
417 friend class ::TempoTest;
419 static Tempo _default_tempo;
420 static Meter _default_meter;
423 framecnt_t _frame_rate;
424 mutable Glib::Threads::RWLock lock;
426 void recompute_map (bool reassign_tempo_bbt, framepos_t end = -1);
428 framepos_t round_to_type (framepos_t fr, RoundMode dir, BBTPointType);
430 const MeterSection& first_meter() const;
431 MeterSection& first_meter();
432 const TempoSection& first_tempo() const;
433 TempoSection& first_tempo();
435 void do_insert (MetricSection* section);
437 void add_tempo_locked (const Tempo&, double where, bool recompute, TempoSection::Type type);
438 void add_meter_locked (const Meter&, double beat, Timecode::BBT_Time where, bool recompute);
440 bool remove_tempo_locked (const TempoSection&);
441 bool remove_meter_locked (const MeterSection&);
445 }; /* namespace ARDOUR */
447 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
448 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
449 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
451 #endif /* __ardour_tempo_h__ */