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 start)
103 : _beat (start), _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 start () const { return _beat; }
110 const double& beat () const { return _beat; }
111 void set_beat (double beat) { _beat = beat;}
113 framepos_t frame() const { return _frame; }
114 virtual void set_frame (framepos_t f) {
118 void set_movable (bool yn) { _movable = yn; }
119 bool movable() const { return _movable; }
121 /* MeterSections are not stateful in the full sense,
122 but we do want them to control their own
123 XML state information.
125 virtual XMLNode& get_state() const = 0;
127 PositionLockStyle position_lock_style () const { return _position_lock_style; }
128 void set_position_lock_style (PositionLockStyle ps) { _position_lock_style = ps; }
134 PositionLockStyle _position_lock_style;
137 /** A section of timeline with a certain Meter. */
138 class LIBARDOUR_API MeterSection : public MetricSection, public Meter {
140 MeterSection (double start, const Timecode::BBT_Time& bbt, double bpb, double note_type)
141 : MetricSection (start), Meter (bpb, note_type), _bbt (bbt) {}
142 MeterSection (framepos_t frame, double bpb, double note_type)
143 : MetricSection (frame), Meter (bpb, note_type) {}
144 MeterSection (const XMLNode&);
146 static const std::string xml_state_node_name;
148 XMLNode& get_state() const;
150 void set_start (std::pair<double, Timecode::BBT_Time>& w) {
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& start, double qpm, double note_type, Type tempo_type)
168 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type) {}
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) {}
171 TempoSection (const XMLNode&);
173 static const std::string xml_state_node_name;
175 XMLNode& get_state() const;
177 void set_start (const double& w) {
181 void update_bar_offset_from_bbt (const Meter&);
182 void update_bbt_time_from_bar_offset (const Meter&);
183 double bar_offset() const { return _bar_offset; }
185 void set_type (Type type);
186 Type type () const { return _type; }
188 double tempo_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
189 framepos_t frame_at_tempo (double tempo, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
191 double tick_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
192 framepos_t frame_at_tick (double tick, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
194 double beat_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
195 framepos_t frame_at_beat (double beat, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
197 Timecode::BBT_Time legacy_bbt () { return _legacy_bbt; }
201 framecnt_t minute_to_frame (double time, framecnt_t frame_rate) const;
202 double frame_to_minute (framecnt_t frame, framecnt_t frame_rate) const;
204 /* tempo ramp functions. zero-based with time in minutes,
205 * 'tick tempo' in ticks per minute and tempo in bpm.
206 * time relative to section start.
208 double c_func (double end_tpm, double end_time) const;
209 double a_func (double end_tpm, double c_func) const;
211 double tick_tempo_at_time (double time, double end_tpm, double end_time) const;
212 double time_at_tick_tempo (double tick_tempo, double end_tpm, double end_time) const;
214 double tick_at_time (double time, double end_tpm, double end_time) const;
215 double time_at_tick (double tick, double end_tpm, double end_time) const;
217 double beat_at_time (double time, double end_tpm, double end_time) const;
218 double time_at_beat (double beat, double end_tpm, double end_time) const;
220 /* this value provides a fractional offset into the bar in which
221 the tempo section is located in. A value of 0.0 indicates that
222 it occurs on the first beat of the bar, a value of 0.5 indicates
223 that it occurs halfway through the bar and so on.
225 this enables us to keep the tempo change at the same relative
226 position within the bar if/when the meter changes.
230 Timecode::BBT_Time _legacy_bbt;
233 typedef std::list<MetricSection*> Metrics;
235 /** Helper class to keep track of the Meter *AND* Tempo in effect
236 at a given point in time.
238 class LIBARDOUR_API TempoMetric {
240 TempoMetric (const Meter& m, const Tempo& t)
241 : _meter (&m), _tempo (&t), _frame (0) {}
243 void set_tempo (const Tempo& t) { _tempo = &t; }
244 void set_meter (const Meter& m) { _meter = &m; }
245 void set_frame (framepos_t f) { _frame = f; }
246 void set_start (const double& t) { _start = t; }
248 void set_metric (const MetricSection* section) {
249 const MeterSection* meter;
250 const TempoSection* tempo;
251 if ((meter = dynamic_cast<const MeterSection*>(section))) {
253 } else if ((tempo = dynamic_cast<const TempoSection*>(section))) {
257 set_frame(section->frame());
258 set_start(section->start());
261 const Meter& meter() const { return *_meter; }
262 const Tempo& tempo() const { return *_tempo; }
263 framepos_t frame() const { return _frame; }
264 const double& start() const { return _start; }
273 /** Tempo Map - mapping of timecode to musical time.
274 * convert audio-samples, sample-rate to Bar/Beat/Tick, Meter/Tempo
276 class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
279 TempoMap (framecnt_t frame_rate);
282 /* measure-based stuff */
291 const MeterSection* meter;
296 BBTPoint (const MeterSection& m, const Tempo& t, framepos_t f,
297 uint32_t b, uint32_t e)
298 : frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
300 Timecode::BBT_Time bbt() const { return Timecode::BBT_Time (bar, beat, 0); }
301 operator Timecode::BBT_Time() const { return bbt(); }
302 operator framepos_t() const { return frame; }
303 bool is_bar() const { return beat == 1; }
306 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
307 Glib::Threads::RWLock::ReaderLock lm (lock);
308 (obj.*method)(metrics);
311 void get_grid (std::vector<BBTPoint>&,
312 framepos_t start, framepos_t end);
314 /* TEMPO- AND METER-SENSITIVE FUNCTIONS
316 bbt_time(), beat_at_frame(), frame_at_beat(), tick_at_frame(),
317 frame_at_tick(),frame_time() and bbt_duration_at()
318 are all sensitive to tempo and meter, and will give answers
319 that align with the grid formed by tempo and meter sections.
321 They SHOULD NOT be used to determine the position of events
322 whose location is canonically defined in beats.
325 void bbt_time (framepos_t when, Timecode::BBT_Time&);
327 double tick_at_frame (framecnt_t frame) const;
328 framecnt_t frame_at_tick (double tick) const;
330 double beat_at_frame (framecnt_t frame) const;
331 framecnt_t frame_at_beat (double beat) const;
333 framepos_t frame_time (const Timecode::BBT_Time&);
334 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir);
336 /* TEMPO-SENSITIVE FUNCTIONS
338 These next 4 functions will all take tempo in account and should be
339 used to determine position (and in the last case, distance in beats)
340 when tempo matters but meter does not.
342 They SHOULD be used to determine the position of events
343 whose location is canonically defined in beats.
346 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
347 framepos_t framepos_plus_beats (framepos_t, Evoral::Beats) const;
348 framepos_t framepos_minus_beats (framepos_t, Evoral::Beats) const;
349 Evoral::Beats framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
351 static const Tempo& default_tempo() { return _default_tempo; }
352 static const Meter& default_meter() { return _default_meter; }
354 const Tempo tempo_at (framepos_t) const;
355 double frames_per_beat_at (framepos_t, framecnt_t sr) const;
357 const Meter& meter_at (framepos_t) const;
359 const TempoSection& tempo_section_at (framepos_t) const;
360 const MeterSection& meter_section_at (framepos_t) const;
362 void add_tempo (const Tempo&, double where, TempoSection::Type type);
363 void add_meter (const Meter&, double start, Timecode::BBT_Time where);
365 void remove_tempo (const TempoSection&, bool send_signal);
366 void remove_meter (const MeterSection&, bool send_signal);
368 void replace_tempo (const TempoSection&, const Tempo&, const double& where, TempoSection::Type type);
369 void gui_set_tempo_frame (TempoSection&, framepos_t where, double beat);
370 void replace_meter (const MeterSection&, const Meter&, const double& start, const Timecode::BBT_Time& where);
372 framepos_t round_to_bar (framepos_t frame, RoundMode dir);
373 framepos_t round_to_beat (framepos_t frame, RoundMode dir);
374 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir);
376 void set_length (framepos_t frames);
378 XMLNode& get_state (void);
379 int set_state (const XMLNode&, int version);
381 void dump (std::ostream&) const;
384 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
386 /** Return the TempoMetric at frame @p t, and point @p last to the latest
387 * metric change <= t, if it is non-NULL.
389 TempoMetric metric_at (framepos_t, Metrics::const_iterator* last=NULL) const;
391 Metrics::const_iterator metrics_end() { return metrics.end(); }
393 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
394 void change_initial_tempo (double bpm, double note_type);
396 void insert_time (framepos_t, framecnt_t);
397 bool remove_time (framepos_t where, framecnt_t amount); //returns true if anything was moved
399 int n_tempos () const;
400 int n_meters () const;
402 framecnt_t frame_rate () const { return _frame_rate; }
404 PBD::Signal0<void> MetricPositionChanged;
406 double bbt_to_beats (Timecode::BBT_Time bbt);
410 friend class ::BBTTest;
411 friend class ::FrameposPlusBeatsTest;
412 friend class ::TempoTest;
414 static Tempo _default_tempo;
415 static Meter _default_meter;
418 framecnt_t _frame_rate;
419 mutable Glib::Threads::RWLock lock;
421 void recompute_map (bool reassign_tempo_bbt, framepos_t end = -1);
423 void _extend_map (TempoSection* tempo, MeterSection* meter,
424 Metrics::iterator next_metric,
425 Timecode::BBT_Time current, framepos_t current_frame, framepos_t end);
427 framepos_t round_to_type (framepos_t fr, RoundMode dir, BBTPointType);
429 const MeterSection& first_meter() const;
430 MeterSection& first_meter();
431 const TempoSection& first_tempo() const;
432 TempoSection& first_tempo();
434 Timecode::BBT_Time beats_to_bbt (double beats);
436 void do_insert (MetricSection* section);
438 void add_tempo_locked (const Tempo&, double where, bool recompute, TempoSection::Type type);
439 void add_meter_locked (const Meter&, double start, Timecode::BBT_Time where, bool recompute);
441 bool remove_tempo_locked (const TempoSection&);
442 bool remove_meter_locked (const MeterSection&);
446 }; /* namespace ARDOUR */
448 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
449 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
450 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
452 #endif /* __ardour_tempo_h__ */