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>
30 #include "pbd/stateful.h"
31 #include "pbd/statefuldestructible.h"
33 #include "evoral/Beats.hpp"
35 #include "ardour/ardour.h"
38 class FrameposPlusBeatsTest;
47 /** Tempo, the speed at which musical time progresses (BPM). */
48 class LIBARDOUR_API Tempo {
51 * @param bpm Beats Per Minute
52 * @param type Note Type (default `4': quarter note)
54 Tempo (double bpm, double type=4.0) // defaulting to quarter note
55 : _beats_per_minute (bpm), _note_type(type) {}
57 double beats_per_minute () const { return _beats_per_minute;}
58 double note_type () const { return _note_type;}
59 /** audio samples per beat
60 * @param sr samplerate
62 double frames_per_beat (framecnt_t sr) const {
63 return (60.0 * sr) / _beats_per_minute;
67 double _beats_per_minute;
71 /** Meter, or time signature (beats per bar, and which note type is a beat). */
72 class LIBARDOUR_API Meter {
74 Meter (double dpb, double bt)
75 : _divisions_per_bar (dpb), _note_type (bt) {}
77 double divisions_per_bar () const { return _divisions_per_bar; }
78 double note_divisor() const { return _note_type; }
80 double frames_per_bar (const Tempo&, framecnt_t sr) const;
81 double frames_per_grid (const Tempo&, framecnt_t sr) const;
84 /** The number of divisions in a bar. This is a floating point value because
85 there are musical traditions on our planet that do not limit
86 themselves to integral numbers of beats per bar.
88 double _divisions_per_bar;
90 /** The type of "note" that a division represents. For example, 4.0 is
91 a quarter (crotchet) note, 8.0 is an eighth (quaver) note, etc.
96 /** A section of timeline with a certain Tempo or Meter. */
97 class LIBARDOUR_API MetricSection {
99 MetricSection (const Timecode::BBT_Time& start)
100 : _start (start), _frame (0), _movable (true) {}
101 MetricSection (framepos_t start)
102 : _frame (start), _movable (true) {}
104 virtual ~MetricSection() {}
106 const Timecode::BBT_Time& start() const { return _start; }
107 framepos_t frame() const { return _frame; }
109 void set_movable (bool yn) { _movable = yn; }
110 bool movable() const { return _movable; }
112 virtual void set_frame (framepos_t f) {
116 virtual void set_start (const Timecode::BBT_Time& w) {
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;
127 Timecode::BBT_Time _start;
132 /** A section of timeline with a certain Meter. */
133 class LIBARDOUR_API MeterSection : public MetricSection, public Meter {
135 MeterSection (const Timecode::BBT_Time& start, double bpb, double note_type)
136 : MetricSection (start), Meter (bpb, note_type) {}
137 MeterSection (framepos_t start, double bpb, double note_type)
138 : MetricSection (start), Meter (bpb, note_type) {}
139 MeterSection (const XMLNode&);
141 static const std::string xml_state_node_name;
143 XMLNode& get_state() const;
146 /** A section of timeline with a certain Tempo. */
147 class LIBARDOUR_API TempoSection : public MetricSection, public Tempo {
149 TempoSection (const Timecode::BBT_Time& start, double qpm, double note_type)
150 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0) {}
151 TempoSection (framepos_t start, double qpm, double note_type)
152 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0) {}
153 TempoSection (const XMLNode&);
155 static const std::string xml_state_node_name;
157 XMLNode& get_state() const;
159 void update_bar_offset_from_bbt (const Meter&);
160 void update_bbt_time_from_bar_offset (const Meter&);
161 double bar_offset() const { return _bar_offset; }
164 /* this value provides a fractional offset into the bar in which
165 the tempo section is located in. A value of 0.0 indicates that
166 it occurs on the first beat of the bar, a value of 0.5 indicates
167 that it occurs halfway through the bar and so on.
169 this enables us to keep the tempo change at the same relative
170 position within the bar if/when the meter changes.
175 typedef std::list<MetricSection*> Metrics;
177 /** Helper class to keep track of the Meter *AND* Tempo in effect
178 at a given point in time.
180 class LIBARDOUR_API TempoMetric {
182 TempoMetric (const Meter& m, const Tempo& t)
183 : _meter (&m), _tempo (&t), _frame (0) {}
185 void set_tempo (const Tempo& t) { _tempo = &t; }
186 void set_meter (const Meter& m) { _meter = &m; }
187 void set_frame (framepos_t f) { _frame = f; }
188 void set_start (const Timecode::BBT_Time& t) { _start = t; }
190 void set_metric (const MetricSection* section) {
191 const MeterSection* meter;
192 const TempoSection* tempo;
193 if ((meter = dynamic_cast<const MeterSection*>(section))) {
195 } else if ((tempo = dynamic_cast<const TempoSection*>(section))) {
199 set_frame(section->frame());
200 set_start(section->start());
203 const Meter& meter() const { return *_meter; }
204 const Tempo& tempo() const { return *_tempo; }
205 framepos_t frame() const { return _frame; }
206 const Timecode::BBT_Time& start() const { return _start; }
212 Timecode::BBT_Time _start;
215 class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
218 TempoMap (framecnt_t frame_rate);
221 /* measure-based stuff */
230 const MeterSection* meter;
231 const TempoSection* tempo;
235 BBTPoint (const MeterSection& m, const TempoSection& t, framepos_t f,
236 uint32_t b, uint32_t e)
237 : frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
239 Timecode::BBT_Time bbt() const { return Timecode::BBT_Time (bar, beat, 0); }
240 operator Timecode::BBT_Time() const { return bbt(); }
241 operator framepos_t() const { return frame; }
242 bool is_bar() const { return beat == 1; }
245 typedef std::vector<BBTPoint> BBTPointList;
247 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
248 Glib::Threads::RWLock::ReaderLock lm (lock);
249 (obj.*method)(metrics);
252 void get_grid (BBTPointList::const_iterator&, BBTPointList::const_iterator&,
253 framepos_t start, framepos_t end);
255 /* TEMPO- AND METER-SENSITIVE FUNCTIONS
257 bbt_time(), bbt_time_rt(), frame_time() and bbt_duration_at()
258 are all sensitive to tempo and meter, and will give answers
259 that align with the grid formed by tempo and meter sections.
261 They SHOULD NOT be used to determine the position of events
262 whose location is canonically defined in beats.
265 void bbt_time (framepos_t when, Timecode::BBT_Time&);
267 /* realtime safe variant of ::bbt_time(), will throw
268 std::logic_error if the map is not large enough
269 to provide an answer.
271 void bbt_time_rt (framepos_t when, Timecode::BBT_Time&);
272 framepos_t frame_time (const Timecode::BBT_Time&);
273 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir);
275 /* TEMPO-SENSITIVE FUNCTIONS
277 These next 4 functions will all take tempo in account and should be
278 used to determine position (and in the last case, distance in beats)
279 when tempo matters but meter does not.
281 They SHOULD be used to determine the position of events
282 whose location is canonically defined in beats.
285 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
286 framepos_t framepos_plus_beats (framepos_t, Evoral::Beats) const;
287 framepos_t framepos_minus_beats (framepos_t, Evoral::Beats) const;
288 Evoral::Beats framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
290 static const Tempo& default_tempo() { return _default_tempo; }
291 static const Meter& default_meter() { return _default_meter; }
293 const Tempo& tempo_at (framepos_t) const;
294 const Meter& meter_at (framepos_t) const;
296 const TempoSection& tempo_section_at (framepos_t) const;
297 const MeterSection& meter_section_at (framepos_t) const;
299 void add_tempo (const Tempo&, Timecode::BBT_Time where);
300 void add_meter (const Meter&, Timecode::BBT_Time where);
302 void remove_tempo (const TempoSection&, bool send_signal);
303 void remove_meter (const MeterSection&, bool send_signal);
305 void replace_tempo (const TempoSection&, const Tempo&, const Timecode::BBT_Time& where);
306 void replace_meter (const MeterSection&, const Meter&, const Timecode::BBT_Time& where);
308 framepos_t round_to_bar (framepos_t frame, RoundMode dir);
309 framepos_t round_to_beat (framepos_t frame, RoundMode dir);
310 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir);
312 void set_length (framepos_t frames);
314 XMLNode& get_state (void);
315 int set_state (const XMLNode&, int version);
317 void dump (std::ostream&) const;
320 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
322 /** Return the TempoMetric at frame @p t, and point @p last to the latest
323 * metric change <= t, if it is non-NULL.
325 TempoMetric metric_at (framepos_t, Metrics::const_iterator* last=NULL) const;
327 Metrics::const_iterator metrics_end() { return metrics.end(); }
329 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
330 void change_initial_tempo (double bpm, double note_type);
332 void insert_time (framepos_t, framecnt_t);
333 bool remove_time (framepos_t where, framecnt_t amount); //returns true if anything was moved
335 int n_tempos () const;
336 int n_meters () const;
338 framecnt_t frame_rate () const { return _frame_rate; }
342 friend class ::BBTTest;
343 friend class ::FrameposPlusBeatsTest;
344 friend class ::TempoTest;
346 static Tempo _default_tempo;
347 static Meter _default_meter;
350 framecnt_t _frame_rate;
351 mutable Glib::Threads::RWLock lock;
354 void recompute_map (bool reassign_tempo_bbt, framepos_t end = -1);
355 void extend_map (framepos_t end);
356 void require_map_to (framepos_t pos);
357 void require_map_to (const Timecode::BBT_Time&);
358 void _extend_map (TempoSection* tempo, MeterSection* meter,
359 Metrics::iterator next_metric,
360 Timecode::BBT_Time current, framepos_t current_frame, framepos_t end);
362 BBTPointList::const_iterator bbt_before_or_at (framepos_t);
363 BBTPointList::const_iterator bbt_before_or_at (const Timecode::BBT_Time&);
364 BBTPointList::const_iterator bbt_after_or_at (framepos_t);
366 framepos_t round_to_type (framepos_t fr, RoundMode dir, BBTPointType);
367 void bbt_time (framepos_t, Timecode::BBT_Time&, const BBTPointList::const_iterator&);
368 framecnt_t bbt_duration_at_unlocked (const Timecode::BBT_Time& when, const Timecode::BBT_Time& bbt, int dir);
370 const MeterSection& first_meter() const;
371 MeterSection& first_meter();
372 const TempoSection& first_tempo() const;
373 TempoSection& first_tempo();
375 void do_insert (MetricSection* section);
377 void add_tempo_locked (const Tempo&, Timecode::BBT_Time where, bool recompute);
378 void add_meter_locked (const Meter&, Timecode::BBT_Time where, bool recompute);
380 bool remove_tempo_locked (const TempoSection&);
381 bool remove_meter_locked (const MeterSection&);
385 }; /* namespace ARDOUR */
387 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
388 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
389 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
391 #endif /* __ardour_tempo_h__ */