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) {}
104 MetricSection (framepos_t start)
105 : _frame (start), _movable (true) {}
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;
131 Timecode::BBT_Time _start;
136 /** A section of timeline with a certain Meter. */
137 class LIBARDOUR_API MeterSection : public MetricSection, public Meter {
139 MeterSection (const Timecode::BBT_Time& start, double bpb, double note_type)
140 : MetricSection (start), Meter (bpb, note_type) {}
141 MeterSection (framepos_t start, double bpb, double note_type)
142 : MetricSection (start), Meter (bpb, note_type) {}
143 MeterSection (const XMLNode&);
145 static const std::string xml_state_node_name;
147 XMLNode& get_state() const;
150 /** A section of timeline with a certain Tempo. */
151 class LIBARDOUR_API TempoSection : public MetricSection, public Tempo {
158 TempoSection (const Timecode::BBT_Time& start, double qpm, double note_type, Type tempo_type)
159 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type) {}
160 TempoSection (framepos_t start, double qpm, double note_type, Type tempo_type)
161 : MetricSection (start), Tempo (qpm, note_type), _bar_offset (-1.0), _type (tempo_type) {}
162 TempoSection (const XMLNode&);
164 static const std::string xml_state_node_name;
166 XMLNode& get_state() const;
168 void update_bar_offset_from_bbt (const Meter&);
169 void update_bbt_time_from_bar_offset (const Meter&);
170 double bar_offset() const { return _bar_offset; }
172 void set_type (Type type);
173 Type type () const { return _type; }
175 double tempo_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
176 framepos_t frame_at_tempo (double tempo, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
178 double tick_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
179 framepos_t frame_at_tick (double tick, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
181 double beat_at_frame (framepos_t frame, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
182 framepos_t frame_at_beat (double beat, double end_bpm, framepos_t end_frame, framecnt_t frame_rate) const;
186 framecnt_t minute_to_frame (double time, framecnt_t frame_rate) const;
187 double frame_to_minute (framecnt_t frame, framecnt_t frame_rate) const;
189 /* tempo ramp functions. zero-based with time in minutes,
190 * 'tick tempo' in ticks per minute and tempo in bpm.
191 * time relative to section start.
193 double c_func (double end_tpm, double end_time) const;
194 double a_func (double begin_tpm, double end_tpm, double end_time) const;
196 double tempo_at_time (double time, double end_bpm, double end_time) const;
197 double time_at_tempo (double tempo, double end_bpm, double end_time) const;
198 double tick_tempo_at_time (double time, double end_tpm, double end_time) const;
199 double time_at_tick_tempo (double tick_tempo, double end_tpm, double end_time) const;
201 double tick_at_time (double time, double end_tpm, double end_time) const;
202 double time_at_tick (double tick, double end_tpm, double end_time) const;
204 double beat_at_time (double time, double end_tpm, double end_time) const;
205 double time_at_beat (double beat, double end_tpm, double end_time) const;
207 /* this value provides a fractional offset into the bar in which
208 the tempo section is located in. A value of 0.0 indicates that
209 it occurs on the first beat of the bar, a value of 0.5 indicates
210 that it occurs halfway through the bar and so on.
212 this enables us to keep the tempo change at the same relative
213 position within the bar if/when the meter changes.
219 typedef std::list<MetricSection*> Metrics;
221 /** Helper class to keep track of the Meter *AND* Tempo in effect
222 at a given point in time.
224 class LIBARDOUR_API TempoMetric {
226 TempoMetric (const Meter& m, const Tempo& t)
227 : _meter (&m), _tempo (&t), _frame (0) {}
229 void set_tempo (const Tempo& t) { _tempo = &t; }
230 void set_meter (const Meter& m) { _meter = &m; }
231 void set_frame (framepos_t f) { _frame = f; }
232 void set_start (const Timecode::BBT_Time& t) { _start = t; }
234 void set_metric (const MetricSection* section) {
235 const MeterSection* meter;
236 const TempoSection* tempo;
237 if ((meter = dynamic_cast<const MeterSection*>(section))) {
239 } else if ((tempo = dynamic_cast<const TempoSection*>(section))) {
243 set_frame(section->frame());
244 set_start(section->start());
247 const Meter& meter() const { return *_meter; }
248 const Tempo& tempo() const { return *_tempo; }
249 framepos_t frame() const { return _frame; }
250 const Timecode::BBT_Time& start() const { return _start; }
256 Timecode::BBT_Time _start;
259 /** Tempo Map - mapping of timecode to musical time.
260 * convert audio-samples, sample-rate to Bar/Beat/Tick, Meter/Tempo
262 class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
265 TempoMap (framecnt_t frame_rate);
268 /* measure-based stuff */
277 const MeterSection* meter;
282 BBTPoint (const MeterSection& m, const Tempo& t, framepos_t f,
283 uint32_t b, uint32_t e)
284 : frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}
286 Timecode::BBT_Time bbt() const { return Timecode::BBT_Time (bar, beat, 0); }
287 operator Timecode::BBT_Time() const { return bbt(); }
288 operator framepos_t() const { return frame; }
289 bool is_bar() const { return beat == 1; }
292 template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
293 Glib::Threads::RWLock::ReaderLock lm (lock);
294 (obj.*method)(metrics);
297 void get_grid (std::vector<BBTPoint>&,
298 framepos_t start, framepos_t end);
300 /* TEMPO- AND METER-SENSITIVE FUNCTIONS
302 bbt_time(), beat_at_frame(), frame_at_beat(), tick_at_frame(),
303 frame_at_tick(),frame_time() and bbt_duration_at()
304 are all sensitive to tempo and meter, and will give answers
305 that align with the grid formed by tempo and meter sections.
307 They SHOULD NOT be used to determine the position of events
308 whose location is canonically defined in beats.
311 void bbt_time (framepos_t when, Timecode::BBT_Time&);
313 double tick_at_frame (framecnt_t frame) const;
314 framecnt_t frame_at_tick (double tick) const;
316 double beat_at_frame (framecnt_t frame) const;
317 framecnt_t frame_at_beat (double beat) const;
319 framepos_t frame_time (const Timecode::BBT_Time&);
320 framecnt_t bbt_duration_at (framepos_t, const Timecode::BBT_Time&, int dir);
322 /* TEMPO-SENSITIVE FUNCTIONS
324 These next 4 functions will all take tempo in account and should be
325 used to determine position (and in the last case, distance in beats)
326 when tempo matters but meter does not.
328 They SHOULD be used to determine the position of events
329 whose location is canonically defined in beats.
332 framepos_t framepos_plus_bbt (framepos_t pos, Timecode::BBT_Time b) const;
333 framepos_t framepos_plus_beats (framepos_t, Evoral::Beats) const;
334 framepos_t framepos_minus_beats (framepos_t, Evoral::Beats) const;
335 Evoral::Beats framewalk_to_beats (framepos_t pos, framecnt_t distance) const;
337 static const Tempo& default_tempo() { return _default_tempo; }
338 static const Meter& default_meter() { return _default_meter; }
340 const Tempo tempo_at (framepos_t) const;
341 double frames_per_beat_at (framepos_t, framecnt_t sr) const;
343 const Meter& meter_at (framepos_t) const;
345 const TempoSection& tempo_section_at (framepos_t) const;
346 TempoSection* tempo_section_after (framepos_t) const;
347 const MeterSection& meter_section_at (framepos_t) const;
349 void add_tempo (const Tempo&, Timecode::BBT_Time where, TempoSection::Type type);
350 void add_meter (const Meter&, Timecode::BBT_Time where);
352 void remove_tempo (const TempoSection&, bool send_signal);
353 void remove_meter (const MeterSection&, bool send_signal);
355 void replace_tempo (const TempoSection&, const Tempo&, const Timecode::BBT_Time& where, TempoSection::Type type);
356 void gui_set_tempo_frame (TempoSection&, framepos_t where);
357 void replace_meter (const MeterSection&, const Meter&, const Timecode::BBT_Time& where);
359 framepos_t round_to_bar (framepos_t frame, RoundMode dir);
360 framepos_t round_to_beat (framepos_t frame, RoundMode dir);
361 framepos_t round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir);
363 void set_length (framepos_t frames);
365 XMLNode& get_state (void);
366 int set_state (const XMLNode&, int version);
368 void dump (std::ostream&) const;
371 TempoMetric metric_at (Timecode::BBT_Time bbt) const;
373 /** Return the TempoMetric at frame @p t, and point @p last to the latest
374 * metric change <= t, if it is non-NULL.
376 TempoMetric metric_at (framepos_t, Metrics::const_iterator* last=NULL) const;
378 Metrics::const_iterator metrics_end() { return metrics.end(); }
380 void change_existing_tempo_at (framepos_t, double bpm, double note_type);
381 void change_initial_tempo (double bpm, double note_type);
383 void insert_time (framepos_t, framecnt_t);
384 bool remove_time (framepos_t where, framecnt_t amount); //returns true if anything was moved
386 int n_tempos () const;
387 int n_meters () const;
389 framecnt_t frame_rate () const { return _frame_rate; }
390 PBD::Signal0<void> MetricPositionChanged;
393 friend class ::BBTTest;
394 friend class ::FrameposPlusBeatsTest;
395 friend class ::TempoTest;
397 static Tempo _default_tempo;
398 static Meter _default_meter;
401 framecnt_t _frame_rate;
402 mutable Glib::Threads::RWLock lock;
404 void recompute_map (bool reassign_tempo_bbt, framepos_t end = -1);
406 void _extend_map (TempoSection* tempo, MeterSection* meter,
407 Metrics::iterator next_metric,
408 Timecode::BBT_Time current, framepos_t current_frame, framepos_t end);
410 framepos_t round_to_type (framepos_t fr, RoundMode dir, BBTPointType);
412 const MeterSection& first_meter() const;
413 MeterSection& first_meter();
414 const TempoSection& first_tempo() const;
415 TempoSection& first_tempo();
417 Timecode::BBT_Time beats_to_bbt (double beats);
418 int32_t bars_in_meter_section (MeterSection* ms) const;
420 void do_insert (MetricSection* section);
422 void add_tempo_locked (const Tempo&, Timecode::BBT_Time where, bool recompute, TempoSection::Type type);
423 void add_meter_locked (const Meter&, Timecode::BBT_Time where, bool recompute);
425 bool remove_tempo_locked (const TempoSection&);
426 bool remove_meter_locked (const MeterSection&);
430 }; /* namespace ARDOUR */
432 std::ostream& operator<< (std::ostream&, const ARDOUR::Meter&);
433 std::ostream& operator<< (std::ostream&, const ARDOUR::Tempo&);
434 std::ostream& operator<< (std::ostream&, const ARDOUR::MetricSection&);
436 #endif /* __ardour_tempo_h__ */