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 ticks_per_minute () const { return _beats_per_minute * Timecode::BBT_Time::ticks_per_beat;}
59 double note_type () const { return _note_type;}
60 /** audio samples per beat
61 * @param sr samplerate
63 double frames_per_beat (framecnt_t sr) const {
64 return (60.0 * sr) / _beats_per_minute;
68 double _beats_per_minute;
72 /** Meter, or time signature (beats per bar, and which note type is a beat). */
73 class LIBARDOUR_API Meter {
75 Meter (double dpb, double bt)
76 : _divisions_per_bar (dpb), _note_type (bt) {}
78 double divisions_per_bar () const { return _divisions_per_bar; }
79 double note_divisor() const { return _note_type; }
81 double frames_per_bar (const Tempo&, framecnt_t sr) const;
82 double frames_per_grid (const Tempo&, framecnt_t sr) const;
85 /** The number of divisions in a bar. This is a floating point value because
86 there are musical traditions on our planet that do not limit
87 themselves to integral numbers of beats per bar.
89 double _divisions_per_bar;
91 /** The type of "note" that a division represents. For example, 4.0 is
92 a quarter (crotchet) note, 8.0 is an eighth (quaver) note, etc.
97 /** A section of timeline with a certain Tempo or Meter. */
98 class LIBARDOUR_API MetricSection {
100 MetricSection (const Timecode::BBT_Time& start)
101 : _start (start), _frame (0), _movable (true) {}
102 MetricSection (framepos_t start)
103 : _frame (start), _movable (true) {}
105 virtual ~MetricSection() {}
107 const Timecode::BBT_Time& start() const { return _start; }
108 framepos_t frame() const { return _frame; }
110 void set_movable (bool yn) { _movable = yn; }
111 bool movable() const { return _movable; }
113 virtual void set_frame (framepos_t f) {
117 virtual void set_start (const Timecode::BBT_Time& w) {
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;
128 Timecode::BBT_Time _start;
133 /** A section of timeline with a certain Meter. */
134 class LIBARDOUR_API MeterSection : public MetricSection, public Meter {
136 MeterSection (const Timecode::BBT_Time& start, double bpb, double note_type)
137 : MetricSection (start), Meter (bpb, note_type) {}
138 MeterSection (framepos_t start, double bpb, double note_type)
139 : MetricSection (start), Meter (bpb, note_type) {}
140 MeterSection (const XMLNode&);
142 static const std::string xml_state_node_name;
144 XMLNode& get_state() const;
147 /** A section of timeline with a certain Tempo. */
148 class LIBARDOUR_API TempoSection : public MetricSection, public Tempo {
150 enum TempoSectionType {
155 TempoSection (const Timecode::BBT_Time& start, double qpm, double note_type, TempoSectionType tempo_type)
156 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type) {}
157 TempoSection (framepos_t start, double qpm, double note_type, TempoSectionType tempo_type)
158 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type) {}
159 TempoSection (const XMLNode&);
161 static const std::string xml_state_node_name;
163 XMLNode& get_state() const;
165 void update_bar_offset_from_bbt (const Meter&);
166 void update_bbt_time_from_bar_offset (const Meter&);
167 double bar_offset() const { return _bar_offset; }
169 void set_type (TempoSectionType type);
170 TempoSectionType type () const { return _type; }
172 double tempo_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
173 framepos_t frame_at_tempo (double tempo, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
175 double tick_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
176 framepos_t frame_at_tick (double tick, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
178 double beat_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
179 framepos_t frame_at_beat (double beat, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
183 framecnt_t minute_to_frame (double time, framecnt_t frame_rate) const;
184 double frame_to_minute (framecnt_t frame, framecnt_t frame_rate) const;
186 /* tempo ramp functions. zero-based with time in minutes,
187 * 'tick tempo' in ticks per minute and tempo in bpm.
188 * time relative to section start.
190 double c_func (double end_tpm, double end_time) const;
191 double a_func (double begin_tpm, double end_tpm, double end_time) const;
193 double tempo_at_time (double time, double end_bpm, double end_time) const;
194 double time_at_tempo (double tempo, double end_bpm, double end_time) const;
195 double tick_tempo_at_time (double time, double end_tpm, double end_time) const;
196 double time_at_tick_tempo (double tick_tempo, double end_tpm, double end_time) const;
198 double tick_at_time (double time, double end_tpm, double end_time) const;
199 double time_at_tick (double tick, double end_tpm, double end_time) const;
201 double beat_at_time (double time, double end_tpm, double end_time) const;
202 double time_at_beat (double beat, double end_tpm, double end_time) const;
204 /* this value provides a fractional offset into the bar in which
205 the tempo section is located in. A value of 0.0 indicates that
206 it occurs on the first beat of the bar, a value of 0.5 indicates
207 that it occurs halfway through the bar and so on.
209 this enables us to keep the tempo change at the same relative
210 position within the bar if/when the meter changes.
213 TempoSectionType _type;
216 typedef std::list<MetricSection*> Metrics;
218 /** Helper class to keep track of the Meter *AND* Tempo in effect
219 at a given point in time.
221 class LIBARDOUR_API TempoMetric {
223 TempoMetric (const Meter& m, const Tempo& t)
224 : _meter (&m), _tempo (&t), _frame (0) {}
226 void set_tempo (const Tempo& t) { _tempo = &t; }
227 void set_meter (const Meter& m) { _meter = &m; }
228 void set_frame (framepos_t f) { _frame = f; }
229 void set_start (const Timecode::BBT_Time& t) { _start = t; }
231 void set_metric (const MetricSection* section) {
232 const MeterSection* meter;
233 const TempoSection* tempo;
234 if ((meter = dynamic_cast<const MeterSection*>(section))) {
236 } else if ((tempo = dynamic_cast<const TempoSection*>(section))) {
240 set_frame(section->frame());
241 set_start(section->start());
244 const Meter& meter() const { return *_meter; }
245 const Tempo& tempo() const { return *_tempo; }
246 framepos_t frame() const { return _frame; }
247 const Timecode::BBT_Time& start() const { return _start; }
253 Timecode::BBT_Time _start;
256 /** Tempo Map - mapping of timecode to musical time.
257 * convert audio-samples, sample-rate to Bar/Beat/Tick, Meter/Tempo
259 class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
262 TempoMap (framecnt_t frame_rate);
265 /* measure-based stuff */
274 const MeterSection* meter;
279 BBTPoint (const MeterSection& m, const Tempo& t, framepos_t f,
280 uint32_t b, uint32_t e)
281 : frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
283 Timecode::BBT_Time bbt() const { return Timecode::BBT_Time (bar, beat, 0); }
284 operator Timecode::BBT_Time() const { return bbt(); }
285 operator framepos_t() const { return frame; }
286 bool is_bar() const { return beat == 1; }
289 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
290 Glib::Threads::RWLock::ReaderLock lm (lock);
291 (obj.*method)(metrics);
294 void get_grid (std::vector<BBTPoint>&,
295 framepos_t start, framepos_t end);
297 /* TEMPO- AND METER-SENSITIVE FUNCTIONS
299 bbt_time(), beat_at_frame(), frame_at_beat(), tick_at_frame(),
300 frame_at_tick(),frame_time() and bbt_duration_at()
301 are all sensitive to tempo and meter, and will give answers
302 that align with the grid formed by tempo and meter sections.
304 They SHOULD NOT be used to determine the position of events
305 whose location is canonically defined in beats.
308 void bbt_time (framepos_t when, Timecode::BBT_Time&);
310 double tick_at_frame (framecnt_t frame) const;
311 framecnt_t frame_at_tick (double tick) const;
313 double beat_at_frame (framecnt_t frame) const;
314 framecnt_t frame_at_beat (double beat) const;
316 framepos_t frame_time (const Timecode::BBT_Time&);
317 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir);
319 /* TEMPO-SENSITIVE FUNCTIONS
321 These next 4 functions will all take tempo in account and should be
322 used to determine position (and in the last case, distance in beats)
323 when tempo matters but meter does not.
325 They SHOULD be used to determine the position of events
326 whose location is canonically defined in beats.
329 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
330 framepos_t framepos_plus_beats (framepos_t, Evoral::Beats) const;
331 framepos_t framepos_minus_beats (framepos_t, Evoral::Beats) const;
332 Evoral::Beats framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
334 static const Tempo& default_tempo() { return _default_tempo; }
335 static const Meter& default_meter() { return _default_meter; }
337 const Tempo tempo_at (framepos_t) const;
338 const Meter& meter_at (framepos_t) const;
340 const TempoSection& tempo_section_at (framepos_t) const;
341 const MeterSection& meter_section_at (framepos_t) const;
343 void add_tempo (const Tempo&, Timecode::BBT_Time where, TempoSection::TempoSectionType type);
344 void add_meter (const Meter&, Timecode::BBT_Time where);
346 void remove_tempo (const TempoSection&, bool send_signal);
347 void remove_meter (const MeterSection&, bool send_signal);
349 void replace_tempo (const TempoSection&, const Tempo&, const Timecode::BBT_Time& where, TempoSection::TempoSectionType type);
350 void replace_meter (const MeterSection&, const Meter&, const Timecode::BBT_Time& where);
352 framepos_t round_to_bar (framepos_t frame, RoundMode dir);
353 framepos_t round_to_beat (framepos_t frame, RoundMode dir);
354 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir);
356 void set_length (framepos_t frames);
358 XMLNode& get_state (void);
359 int set_state (const XMLNode&, int version);
361 void dump (std::ostream&) const;
364 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
366 /** Return the TempoMetric at frame @p t, and point @p last to the latest
367 * metric change <= t, if it is non-NULL.
369 TempoMetric metric_at (framepos_t, Metrics::const_iterator* last=NULL) const;
371 Metrics::const_iterator metrics_end() { return metrics.end(); }
373 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
374 void change_initial_tempo (double bpm, double note_type);
376 void insert_time (framepos_t, framecnt_t);
377 bool remove_time (framepos_t where, framecnt_t amount); //returns true if anything was moved
379 int n_tempos () const;
380 int n_meters () const;
382 framecnt_t frame_rate () const { return _frame_rate; }
386 friend class ::BBTTest;
387 friend class ::FrameposPlusBeatsTest;
388 friend class ::TempoTest;
390 static Tempo _default_tempo;
391 static Meter _default_meter;
394 framecnt_t _frame_rate;
395 mutable Glib::Threads::RWLock lock;
397 void recompute_map (bool reassign_tempo_bbt, framepos_t end = -1);
399 void _extend_map (TempoSection* tempo, MeterSection* meter,
400 Metrics::iterator next_metric,
401 Timecode::BBT_Time current, framepos_t current_frame, framepos_t end);
403 framepos_t round_to_type (framepos_t fr, RoundMode dir, BBTPointType);
405 const MeterSection& first_meter() const;
406 MeterSection& first_meter();
407 const TempoSection& first_tempo() const;
408 TempoSection& first_tempo();
410 Timecode::BBT_Time beats_to_bbt (double beats);
411 int32_t bars_in_meter_section (MeterSection* ms) const;
413 void do_insert (MetricSection* section);
415 void add_tempo_locked (const Tempo&, Timecode::BBT_Time where, bool recompute, TempoSection::TempoSectionType type);
416 void add_meter_locked (const Meter&, Timecode::BBT_Time where, bool recompute);
418 bool remove_tempo_locked (const TempoSection&);
419 bool remove_meter_locked (const MeterSection&);
423 }; /* namespace ARDOUR */
425 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
426 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
427 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
429 #endif /* __ardour_tempo_h__ */