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 (const Timecode::BBT_Time& start)
103 : _start (start), _frame (0), _movable (true), _position_lock_style (MusicTime) {}
104 MetricSection (framepos_t start)
105 : _frame (start), _movable (true), _position_lock_style (MusicTime) {}
107 virtual ~MetricSection() {}
109 const Timecode::BBT_Time& start() const { return _start; }
110 framepos_t frame() const { return _frame; }
112 void set_movable (bool yn) { _movable = yn; }
113 bool movable() const { return _movable; }
115 virtual void set_frame (framepos_t f) {
119 virtual void set_start (const Timecode::BBT_Time& w) {
123 /* MeterSections are not stateful in the full sense,
124 but we do want them to control their own
125 XML state information.
127 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; }
133 Timecode::BBT_Time _start;
136 PositionLockStyle _position_lock_style;
139 /** A section of timeline with a certain Meter. */
140 class LIBARDOUR_API MeterSection : public MetricSection, public Meter {
142 MeterSection (const Timecode::BBT_Time& start, double bpb, double note_type)
143 : MetricSection (start), Meter (bpb, note_type) {}
144 MeterSection (framepos_t start, double bpb, double note_type)
145 : MetricSection (start), Meter (bpb, note_type) {}
146 MeterSection (const XMLNode&);
148 static const std::string xml_state_node_name;
150 XMLNode& get_state() const;
153 /** A section of timeline with a certain Tempo. */
154 class LIBARDOUR_API TempoSection : public MetricSection, public Tempo {
161 TempoSection (const Timecode::BBT_Time& start, double qpm, double note_type, Type tempo_type)
162 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type) {}
163 TempoSection (framepos_t start, double qpm, double note_type, Type tempo_type)
164 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type) {}
165 TempoSection (const XMLNode&);
167 static const std::string xml_state_node_name;
169 XMLNode& get_state() const;
171 void update_bar_offset_from_bbt (const Meter&);
172 void update_bbt_time_from_bar_offset (const Meter&);
173 double bar_offset() const { return _bar_offset; }
175 void set_type (Type type);
176 Type type () const { return _type; }
178 double tempo_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
179 framepos_t frame_at_tempo (double tempo, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
181 double tick_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
182 framepos_t frame_at_tick (double tick, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
184 double beat_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
185 framepos_t frame_at_beat (double beat, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
189 framecnt_t minute_to_frame (double time, framecnt_t frame_rate) const;
190 double frame_to_minute (framecnt_t frame, framecnt_t frame_rate) const;
192 /* tempo ramp functions. zero-based with time in minutes,
193 * 'tick tempo' in ticks per minute and tempo in bpm.
194 * time relative to section start.
196 double c_func (double end_tpm, double end_time) const;
197 double a_func (double begin_tpm, double end_tpm, double end_time) const;
199 double tempo_at_time (double time, double end_bpm, double end_time) const;
200 double time_at_tempo (double tempo, double end_bpm, double end_time) const;
201 double tick_tempo_at_time (double time, double end_tpm, double end_time) const;
202 double time_at_tick_tempo (double tick_tempo, double end_tpm, double end_time) const;
204 double tick_at_time (double time, double end_tpm, double end_time) const;
205 double time_at_tick (double tick, double end_tpm, double end_time) const;
207 double beat_at_time (double time, double end_tpm, double end_time) const;
208 double time_at_beat (double beat, double end_tpm, double end_time) const;
210 /* this value provides a fractional offset into the bar in which
211 the tempo section is located in. A value of 0.0 indicates that
212 it occurs on the first beat of the bar, a value of 0.5 indicates
213 that it occurs halfway through the bar and so on.
215 this enables us to keep the tempo change at the same relative
216 position within the bar if/when the meter changes.
222 typedef std::list<MetricSection*> Metrics;
224 /** Helper class to keep track of the Meter *AND* Tempo in effect
225 at a given point in time.
227 class LIBARDOUR_API TempoMetric {
229 TempoMetric (const Meter& m, const Tempo& t)
230 : _meter (&m), _tempo (&t), _frame (0) {}
232 void set_tempo (const Tempo& t) { _tempo = &t; }
233 void set_meter (const Meter& m) { _meter = &m; }
234 void set_frame (framepos_t f) { _frame = f; }
235 void set_start (const Timecode::BBT_Time& t) { _start = t; }
237 void set_metric (const MetricSection* section) {
238 const MeterSection* meter;
239 const TempoSection* tempo;
240 if ((meter = dynamic_cast<const MeterSection*>(section))) {
242 } else if ((tempo = dynamic_cast<const TempoSection*>(section))) {
246 set_frame(section->frame());
247 set_start(section->start());
250 const Meter& meter() const { return *_meter; }
251 const Tempo& tempo() const { return *_tempo; }
252 framepos_t frame() const { return _frame; }
253 const Timecode::BBT_Time& start() const { return _start; }
259 Timecode::BBT_Time _start;
262 /** Tempo Map - mapping of timecode to musical time.
263 * convert audio-samples, sample-rate to Bar/Beat/Tick, Meter/Tempo
265 class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
268 TempoMap (framecnt_t frame_rate);
271 /* measure-based stuff */
280 const MeterSection* meter;
285 BBTPoint (const MeterSection& m, const Tempo& t, framepos_t f,
286 uint32_t b, uint32_t e)
287 : frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
289 Timecode::BBT_Time bbt() const { return Timecode::BBT_Time (bar, beat, 0); }
290 operator Timecode::BBT_Time() const { return bbt(); }
291 operator framepos_t() const { return frame; }
292 bool is_bar() const { return beat == 1; }
295 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
296 Glib::Threads::RWLock::ReaderLock lm (lock);
297 (obj.*method)(metrics);
300 void get_grid (std::vector<BBTPoint>&,
301 framepos_t start, framepos_t end);
303 /* TEMPO- AND METER-SENSITIVE FUNCTIONS
305 bbt_time(), beat_at_frame(), frame_at_beat(), tick_at_frame(),
306 frame_at_tick(),frame_time() and bbt_duration_at()
307 are all sensitive to tempo and meter, and will give answers
308 that align with the grid formed by tempo and meter sections.
310 They SHOULD NOT be used to determine the position of events
311 whose location is canonically defined in beats.
314 void bbt_time (framepos_t when, Timecode::BBT_Time&);
316 double tick_at_frame (framecnt_t frame) const;
317 framecnt_t frame_at_tick (double tick) const;
319 double beat_at_frame (framecnt_t frame) const;
320 framecnt_t frame_at_beat (double beat) const;
322 framepos_t frame_time (const Timecode::BBT_Time&);
323 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir);
325 /* TEMPO-SENSITIVE FUNCTIONS
327 These next 4 functions will all take tempo in account and should be
328 used to determine position (and in the last case, distance in beats)
329 when tempo matters but meter does not.
331 They SHOULD be used to determine the position of events
332 whose location is canonically defined in beats.
335 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
336 framepos_t framepos_plus_beats (framepos_t, Evoral::Beats) const;
337 framepos_t framepos_minus_beats (framepos_t, Evoral::Beats) const;
338 Evoral::Beats framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
340 static const Tempo& default_tempo() { return _default_tempo; }
341 static const Meter& default_meter() { return _default_meter; }
343 const Tempo tempo_at (framepos_t) const;
344 double frames_per_beat_at (framepos_t, framecnt_t sr) const;
346 const Meter& meter_at (framepos_t) const;
348 const TempoSection& tempo_section_at (framepos_t) const;
349 TempoSection* tempo_section_after (framepos_t) const;
350 const MeterSection& meter_section_at (framepos_t) const;
352 void add_tempo (const Tempo&, Timecode::BBT_Time where, TempoSection::Type type);
353 void add_meter (const Meter&, Timecode::BBT_Time where);
355 void remove_tempo (const TempoSection&, bool send_signal);
356 void remove_meter (const MeterSection&, bool send_signal);
358 void replace_tempo (const TempoSection&, const Tempo&, const Timecode::BBT_Time& where, TempoSection::Type type);
359 void gui_set_tempo_frame (TempoSection&, framepos_t where);
360 void replace_meter (const MeterSection&, const Meter&, const Timecode::BBT_Time& where);
362 framepos_t round_to_bar (framepos_t frame, RoundMode dir);
363 framepos_t round_to_beat (framepos_t frame, RoundMode dir);
364 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir);
366 void set_length (framepos_t frames);
368 XMLNode& get_state (void);
369 int set_state (const XMLNode&, int version);
371 void dump (std::ostream&) const;
374 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
376 /** Return the TempoMetric at frame @p t, and point @p last to the latest
377 * metric change <= t, if it is non-NULL.
379 TempoMetric metric_at (framepos_t, Metrics::const_iterator* last=NULL) const;
381 Metrics::const_iterator metrics_end() { return metrics.end(); }
383 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
384 void change_initial_tempo (double bpm, double note_type);
386 void insert_time (framepos_t, framecnt_t);
387 bool remove_time (framepos_t where, framecnt_t amount); //returns true if anything was moved
389 int n_tempos () const;
390 int n_meters () const;
392 framecnt_t frame_rate () const { return _frame_rate; }
394 PBD::Signal0<void> MetricPositionChanged;
398 friend class ::BBTTest;
399 friend class ::FrameposPlusBeatsTest;
400 friend class ::TempoTest;
402 static Tempo _default_tempo;
403 static Meter _default_meter;
406 framecnt_t _frame_rate;
407 mutable Glib::Threads::RWLock lock;
409 void recompute_map (bool reassign_tempo_bbt, framepos_t end = -1);
411 void _extend_map (TempoSection* tempo, MeterSection* meter,
412 Metrics::iterator next_metric,
413 Timecode::BBT_Time current, framepos_t current_frame, framepos_t end);
415 framepos_t round_to_type (framepos_t fr, RoundMode dir, BBTPointType);
417 const MeterSection& first_meter() const;
418 MeterSection& first_meter();
419 const TempoSection& first_tempo() const;
420 TempoSection& first_tempo();
422 Timecode::BBT_Time beats_to_bbt (double beats);
423 int32_t bars_in_meter_section (MeterSection* ms) const;
425 void do_insert (MetricSection* section);
427 void add_tempo_locked (const Tempo&, Timecode::BBT_Time where, bool recompute, TempoSection::Type type);
428 void add_meter_locked (const Meter&, Timecode::BBT_Time where, bool recompute);
430 bool remove_tempo_locked (const TempoSection&);
431 bool remove_meter_locked (const MeterSection&);
435 }; /* namespace ARDOUR */
437 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
438 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
439 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
441 #endif /* __ardour_tempo_h__ */