diff options
author | Taybin Rutkin <taybin@taybin.com> | 2005-09-24 19:13:41 +0000 |
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committer | Taybin Rutkin <taybin@taybin.com> | 2005-09-24 19:13:41 +0000 |
commit | 8af0757b61990767f2a85e68f535a5af9976fd79 (patch) | |
tree | f9e06fe12cac866d658a2e7074a61aa74d12f68f /libs/ardour/tempo.cc | |
parent | f9546e5c76afa101e9dbe8a057e72463b03430e5 (diff) |
libardour added.
git-svn-id: svn://localhost/trunk/ardour2@17 d708f5d6-7413-0410-9779-e7cbd77b26cf
Diffstat (limited to 'libs/ardour/tempo.cc')
-rw-r--r-- | libs/ardour/tempo.cc | 1323 |
1 files changed, 1323 insertions, 0 deletions
diff --git a/libs/ardour/tempo.cc b/libs/ardour/tempo.cc new file mode 100644 index 0000000000..8042644d39 --- /dev/null +++ b/libs/ardour/tempo.cc @@ -0,0 +1,1323 @@ +/* + Copyright (C) 2000-2002 Paul Davis + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id$ +*/ + +#include <algorithm> +#include <unistd.h> + +#include <cmath> + +#include <sigc++/bind.h> + +#include <pbd/lockmonitor.h> +#include <pbd/xml++.h> +#include <ardour/tempo.h> +#include <ardour/utils.h> + +#include "i18n.h" +#include <locale.h> + +using namespace std; +using namespace ARDOUR; + +/* _default tempo is 4/4 qtr=120 */ + +Meter TempoMap::_default_meter (4.0, 4.0); +Tempo TempoMap::_default_tempo (120.0); + +const double Meter::ticks_per_beat = 1920.0; + +/***********************************************************************/ + +double +Meter::frames_per_bar (const Tempo& tempo, jack_nframes_t sr) const +{ + return ((60.0 * sr * _beats_per_bar) / tempo.beats_per_minute()); +} + +/***********************************************************************/ + +const string TempoSection::xml_state_node_name = "Tempo"; + +TempoSection::TempoSection (const XMLNode& node) + : MetricSection (BBT_Time()), Tempo (TempoMap::default_tempo()) +{ + const XMLProperty *prop; + BBT_Time start; + LocaleGuard lg (X_("POSIX")); + + if ((prop = node.property ("start")) == 0) { + error << _("TempoSection XML node has no \"start\" property") << endmsg; + throw failed_constructor(); + } + + if (sscanf (prop->value().c_str(), "%lu|%lu|%lu", + &start.bars, + &start.beats, + &start.ticks) < 3) { + error << _("TempoSection XML node has an illegal \"start\" value") << endmsg; + throw failed_constructor(); + } + + set_start (start); + + if ((prop = node.property ("beats-per-minute")) == 0) { + error << _("TempoSection XML node has no \"beats-per-minute\" property") << endmsg; + throw failed_constructor(); + } + + if (sscanf (prop->value().c_str(), "%lf", &_beats_per_minute) != 1 || _beats_per_minute < 0.0) { + error << _("TempoSection XML node has an illegal \"beats_per_minute\" value") << endmsg; + throw failed_constructor(); + } + + if ((prop = node.property ("movable")) == 0) { + error << _("TempoSection XML node has no \"movable\" property") << endmsg; + throw failed_constructor(); + } + + set_movable (prop->value() == "yes"); +} + +XMLNode& +TempoSection::get_state() const +{ + XMLNode *root = new XMLNode (xml_state_node_name); + char buf[256]; + LocaleGuard lg (X_("POSIX")); + + snprintf (buf, sizeof (buf), "%" PRIu32 "|%" PRIu32 "|%" PRIu32, + start().bars, + start().beats, + start().ticks); + root->add_property ("start", buf); + snprintf (buf, sizeof (buf), "%f", _beats_per_minute); + root->add_property ("beats-per-minute", buf); + snprintf (buf, sizeof (buf), "%s", movable()?"yes":"no"); + root->add_property ("movable", buf); + + return *root; +} + +/***********************************************************************/ + +const string MeterSection::xml_state_node_name = "Meter"; + +MeterSection::MeterSection (const XMLNode& node) + : MetricSection (BBT_Time()), Meter (TempoMap::default_meter()) +{ + const XMLProperty *prop; + BBT_Time start; + LocaleGuard lg (X_("POSIX")); + + if ((prop = node.property ("start")) == 0) { + error << _("MeterSection XML node has no \"start\" property") << endmsg; + throw failed_constructor(); + } + + if (sscanf (prop->value().c_str(), "%lu|%lu|%lu", + &start.bars, + &start.beats, + &start.ticks) < 3) { + error << _("MeterSection XML node has an illegal \"start\" value") << endmsg; + throw failed_constructor(); + } + + set_start (start); + + if ((prop = node.property ("beats-per-bar")) == 0) { + error << _("MeterSection XML node has no \"beats-per-bar\" property") << endmsg; + throw failed_constructor(); + } + + if (sscanf (prop->value().c_str(), "%lf", &_beats_per_bar) != 1 || _beats_per_bar < 0.0) { + error << _("MeterSection XML node has an illegal \"beats-per-bar\" value") << endmsg; + throw failed_constructor(); + } + + if ((prop = node.property ("note-type")) == 0) { + error << _("MeterSection XML node has no \"note-type\" property") << endmsg; + throw failed_constructor(); + } + + if (sscanf (prop->value().c_str(), "%lf", &_note_type) != 1 || _note_type < 0.0) { + error << _("MeterSection XML node has an illegal \"note-type\" value") << endmsg; + throw failed_constructor(); + } + + if ((prop = node.property ("movable")) == 0) { + error << _("MeterSection XML node has no \"movable\" property") << endmsg; + throw failed_constructor(); + } + + set_movable (prop->value() == "yes"); +} + +XMLNode& +MeterSection::get_state() const +{ + XMLNode *root = new XMLNode (xml_state_node_name); + char buf[256]; + LocaleGuard lg (X_("POSIX")); + + snprintf (buf, sizeof (buf), "%" PRIu32 "|%" PRIu32 "|%" PRIu32, + start().bars, + start().beats, + start().ticks); + root->add_property ("start", buf); + snprintf (buf, sizeof (buf), "%f", _note_type); + root->add_property ("note-type", buf); + snprintf (buf, sizeof (buf), "%f", _beats_per_bar); + root->add_property ("beats-per-bar", buf); + snprintf (buf, sizeof (buf), "%s", movable()?"yes":"no"); + root->add_property ("movable", buf); + + return *root; +} + +/***********************************************************************/ + +struct MetricSectionSorter { + bool operator() (const MetricSection* a, const MetricSection* b) { + return a->start() < b->start(); + } +}; + +TempoMap::TempoMap (jack_nframes_t fr) +{ + metrics = new Metrics; + _frame_rate = fr; + last_bbt_valid = false; + BBT_Time start; + in_set_state = false; + + start.bars = 1; + start.beats = 1; + start.ticks = 0; + + TempoSection *t = new TempoSection (start, _default_tempo.beats_per_minute()); + MeterSection *m = new MeterSection (start, _default_meter.beats_per_bar(), _default_meter.note_divisor()); + + t->set_movable (false); + m->set_movable (false); + + /* note: frame time is correct (zero) for both of these */ + + metrics->push_back (t); + metrics->push_back (m); + + save_state (_("initial")); +} + +TempoMap::~TempoMap () +{ +} + +int +TempoMap::move_metric_section (MetricSection& section, const BBT_Time& when) +{ + if (when == section.start()) { + return -1; + } + + if (!section.movable()) { + return 1; + } + + LockMonitor lm (lock, __LINE__, __FILE__); + MetricSectionSorter cmp; + BBT_Time corrected (when); + + if (dynamic_cast<MeterSection*>(§ion) != 0) { + if (corrected.beats > 1) { + corrected.beats = 1; + corrected.bars++; + } + } + corrected.ticks = 0; + + section.set_start (corrected); + metrics->sort (cmp); + timestamp_metrics (); + save_state (_("move metric")); + + return 0; +} + +void +TempoMap::move_tempo (TempoSection& tempo, const BBT_Time& when) +{ + if (move_metric_section (tempo, when) == 0) { + send_state_changed (Change (0)); + } +} + +void +TempoMap::move_meter (MeterSection& meter, const BBT_Time& when) +{ + if (move_metric_section (meter, when) == 0) { + send_state_changed (Change (0)); + } +} + + +void +TempoMap::remove_tempo (const TempoSection& tempo) +{ + bool removed = false; + + { + LockMonitor lm (lock, __LINE__, __FILE__); + Metrics::iterator i; + + for (i = metrics->begin(); i != metrics->end(); ++i) { + if (dynamic_cast<TempoSection*> (*i) != 0) { + if (tempo.frame() == (*i)->frame()) { + if ((*i)->movable()) { + metrics->erase (i); + removed = true; + break; + } + } + } + } + } + + if (removed) { + send_state_changed (Change (0)); + } +} + +void +TempoMap::remove_meter (const MeterSection& tempo) +{ + bool removed = false; + + { + LockMonitor lm (lock, __LINE__, __FILE__); + Metrics::iterator i; + + for (i = metrics->begin(); i != metrics->end(); ++i) { + if (dynamic_cast<MeterSection*> (*i) != 0) { + if (tempo.frame() == (*i)->frame()) { + if ((*i)->movable()) { + metrics->erase (i); + removed = true; + break; + } + } + } + } + + if (removed) { + save_state (_("metric removed")); + } + } + + if (removed) { + send_state_changed (Change (0)); + } +} + +void +TempoMap::do_insert (MetricSection* section) +{ + Metrics::iterator i; + + for (i = metrics->begin(); i != metrics->end(); ++i) { + + if ((*i)->start() < section->start()) { + continue; + } + + metrics->insert (i, section); + break; + } + + if (i == metrics->end()) { + metrics->insert (metrics->end(), section); + } + + timestamp_metrics (); +} + +void +TempoMap::add_tempo (const Tempo& tempo, BBT_Time where) +{ + { + LockMonitor lm (lock, __LINE__, __FILE__); + + /* new tempos always start on a beat */ + + where.ticks = 0; + + do_insert (new TempoSection (where, tempo.beats_per_minute())); + + save_state (_("add tempo")); + } + + send_state_changed (Change (0)); +} + +void +TempoMap::replace_tempo (TempoSection& existing, const Tempo& replacement) +{ + bool replaced = false; + + { + LockMonitor lm (lock, __LINE__, __FILE__); + Metrics::iterator i; + + for (i = metrics->begin(); i != metrics->end(); ++i) { + TempoSection *ts; + + if ((ts = dynamic_cast<TempoSection*>(*i)) != 0 && ts == &existing) { + + *((Tempo *) ts) = replacement; + + replaced = true; + timestamp_metrics (); + break; + } + } + + if (replaced) { + save_state (_("replace tempo")); + } + } + + if (replaced) { + send_state_changed (Change (0)); + } +} + +void +TempoMap::add_meter (const Meter& meter, BBT_Time where) +{ + { + LockMonitor lm (lock, __LINE__, __FILE__); + + /* a new meter always starts a new bar on the first beat. so + round the start time appropriately. remember that + `where' is based on the existing tempo map, not + the result after we insert the new meter. + + */ + + if (where.beats != 1) { + where.beats = 1; + where.bars++; + } + + /* new meters *always* start on a beat. */ + + where.ticks = 0; + + do_insert (new MeterSection (where, meter.beats_per_bar(), meter.note_divisor())); + + save_state (_("add meter")); + } + + send_state_changed (Change (0)); +} + +void +TempoMap::replace_meter (MeterSection& existing, const Meter& replacement) +{ + bool replaced = false; + + { + LockMonitor lm (lock, __LINE__, __FILE__); + Metrics::iterator i; + + for (i = metrics->begin(); i != metrics->end(); ++i) { + MeterSection *ms; + if ((ms = dynamic_cast<MeterSection*>(*i)) != 0 && ms == &existing) { + + *((Meter*) ms) = replacement; + + replaced = true; + timestamp_metrics (); + break; + } + } + + if (replaced) { + save_state (_("replaced meter")); + } + } + + if (replaced) { + send_state_changed (Change (0)); + } +} + +const MeterSection& +TempoMap::first_meter () const +{ + const MeterSection *m = 0; + + for (Metrics::const_iterator i = metrics->begin(); i != metrics->end(); ++i) { + if ((m = dynamic_cast<const MeterSection *> (*i)) != 0) { + return *m; + } + } + + fatal << _("programming error: no tempo section in tempo map!") << endmsg; + /*NOTREACHED*/ + return *m; +} + +const TempoSection& +TempoMap::first_tempo () const +{ + const TempoSection *t = 0; + + for (Metrics::const_iterator i = metrics->begin(); i != metrics->end(); ++i) { + if ((t = dynamic_cast<const TempoSection *> (*i)) != 0) { + return *t; + } + } + + fatal << _("programming error: no tempo section in tempo map!") << endmsg; + /*NOTREACHED*/ + return *t; +} + +void +TempoMap::timestamp_metrics () +{ + Metrics::iterator i; + const Meter* meter; + const Tempo* tempo; + Meter *m; + Tempo *t; + jack_nframes_t current; + jack_nframes_t section_frames; + BBT_Time start; + BBT_Time end; + + meter = &first_meter (); + tempo = &first_tempo (); + current = 0; + + for (i = metrics->begin(); i != metrics->end(); ++i) { + + end = (*i)->start(); + + section_frames = count_frames_between_metrics (*meter, *tempo, start, end); + + current += section_frames; + + start = end; + + (*i)->set_frame (current); + + if ((t = dynamic_cast<TempoSection*>(*i)) != 0) { + tempo = t; + } else if ((m = dynamic_cast<MeterSection*>(*i)) != 0) { + meter = m; + } else { + fatal << _("programming error: unhandled MetricSection type") << endmsg; + /*NOTREACHED*/ + } + } +} + +TempoMap::Metric +TempoMap::metric_at (jack_nframes_t frame) const +{ + Metric m (first_meter(), first_tempo()); + const Meter* meter; + const Tempo* tempo; + + /* at this point, we are *guaranteed* to have m.meter and m.tempo pointing + at something, because we insert the default tempo and meter during + TempoMap construction. + + now see if we can find better candidates. + */ + + for (Metrics::const_iterator i = metrics->begin(); i != metrics->end(); ++i) { + + if ((*i)->frame() > frame) { + break; + } + + if ((tempo = dynamic_cast<const TempoSection*>(*i)) != 0) { + m.set_tempo (*tempo); + } else if ((meter = dynamic_cast<const MeterSection*>(*i)) != 0) { + m.set_meter (*meter); + } + + m.set_frame ((*i)->frame ()); + m.set_start ((*i)->start ()); + } + + return m; +} + +TempoMap::Metric +TempoMap::metric_at (BBT_Time bbt) const +{ + Metric m (first_meter(), first_tempo()); + const Meter* meter; + const Tempo* tempo; + + /* at this point, we are *guaranteed* to have m.meter and m.tempo pointing + at something, because we insert the default tempo and meter during + TempoMap construction. + + now see if we can find better candidates. + */ + + for (Metrics::const_iterator i = metrics->begin(); i != metrics->end(); ++i) { + + BBT_Time section_start ((*i)->start()); + + if (section_start.bars > bbt.bars || (section_start.bars == bbt.bars && section_start.beats > bbt.beats)) { + break; + } + + if ((tempo = dynamic_cast<const TempoSection*>(*i)) != 0) { + m.set_tempo (*tempo); + } else if ((meter = dynamic_cast<const MeterSection*>(*i)) != 0) { + m.set_meter (*meter); + } + + m.set_frame ((*i)->frame ()); + m.set_start (section_start); + } + + return m; +} + +void +TempoMap::bbt_time (jack_nframes_t frame, BBT_Time& bbt) const +{ + LockMonitor lm (lock, __LINE__, __FILE__); + bbt_time_unlocked (frame, bbt); +} + +void +TempoMap::bbt_time_unlocked (jack_nframes_t frame, BBT_Time& bbt) const +{ + bbt_time_with_metric (frame, bbt, metric_at (frame)); +} + +void +TempoMap::bbt_time_with_metric (jack_nframes_t frame, BBT_Time& bbt, const Metric& metric) const +{ + jack_nframes_t frame_diff; + + uint32_t xtra_bars = 0; + double xtra_beats = 0; + double beats = 0; + + const double beats_per_bar = metric.meter().beats_per_bar(); + const double frames_per_bar = metric.meter().frames_per_bar (metric.tempo(), _frame_rate); + const double beat_frames = metric.tempo().frames_per_beat (_frame_rate); + + /* now compute how far beyond that point we actually are. */ + + frame_diff = frame - metric.frame(); + + xtra_bars = (uint32_t) floor (frame_diff / frames_per_bar); + frame_diff -= (uint32_t) floor (xtra_bars * frames_per_bar); + xtra_beats = (double) frame_diff / beat_frames; + + + /* and set the returned value */ + + /* and correct beat/bar shifts to match the meter. + remember: beat and bar counting is 1-based, + not zero-based + also the meter may contain a fraction + */ + + bbt.bars = metric.start().bars + xtra_bars; + + beats = (double) metric.start().beats + xtra_beats; + + bbt.bars += (uint32_t) floor(beats/ (beats_per_bar+1) ); + + beats = fmod(beats - 1, beats_per_bar )+ 1.0; + bbt.ticks = (uint32_t)( round((beats - floor(beats)) *(double) Meter::ticks_per_beat)); + bbt.beats = (uint32_t) floor(beats); + +} + + +jack_nframes_t +TempoMap::count_frames_between ( const BBT_Time& start, const BBT_Time& end) const +{ + + /* for this to work with fractional measure types, start and end have to "legal" BBT types, + that means that the beats and ticks should be inside a bar + */ + + + jack_nframes_t frames = 0; + jack_nframes_t start_frame = 0; + jack_nframes_t end_frame = 0; + + Metric m = metric_at(start); + + uint32_t bar_offset = start.bars - m.start().bars; + + double beat_offset = bar_offset*m.meter().beats_per_bar() - (m.start().beats-1) + (start.beats -1) + + start.ticks/Meter::ticks_per_beat; + + + start_frame = m.frame() + (jack_nframes_t) rint( beat_offset * m.tempo().frames_per_beat(_frame_rate)); + + m = metric_at(end); + + bar_offset = end.bars - m.start().bars; + + beat_offset = bar_offset * m.meter().beats_per_bar() - (m.start().beats -1) + (end.beats - 1) + + end.ticks/Meter::ticks_per_beat; + + end_frame = m.frame() + (jack_nframes_t) rint(beat_offset * m.tempo().frames_per_beat(_frame_rate)); + + frames = end_frame - start_frame; + + return frames; + +} + +jack_nframes_t +TempoMap::count_frames_between_metrics (const Meter& meter, const Tempo& tempo, const BBT_Time& start, const BBT_Time& end) const +{ + /*this is used in timestamping the metrics by actually counting the beats */ + + jack_nframes_t frames = 0; + uint32_t bar = start.bars; + double beat = (double) start.beats; + double beats_counted = 0; + double beats_per_bar = 0; + double beat_frames = 0; + + beats_per_bar = meter.beats_per_bar(); + beat_frames = tempo.frames_per_beat (_frame_rate); + + frames = 0; + + while (bar < end.bars || (bar == end.bars && beat < end.beats)) { + + if (beat >= beats_per_bar) { + beat = 1; + ++bar; + ++beats_counted; + } else { + ++beat; + ++beats_counted; + if (beat > beats_per_bar) { + /* this is a fractional beat at the end of a fractional bar + so it should only count for the fraction */ + beats_counted -= (ceil(beats_per_bar) - beats_per_bar); + } + } + } + + frames = (jack_nframes_t) floor (beats_counted * beat_frames); + + return frames; + +} + +jack_nframes_t +TempoMap::frame_time (const BBT_Time& bbt) const +{ + BBT_Time start ; /* 1|1|0 */ + + return count_frames_between ( start, bbt); +} + +jack_nframes_t +TempoMap::bbt_duration_at (jack_nframes_t pos, const BBT_Time& bbt, int dir) const +{ + jack_nframes_t frames = 0; + + BBT_Time when; + bbt_time(pos,when); + + { + LockMonitor lm (lock, __LINE__, __FILE__); + frames = bbt_duration_at_unlocked (when, bbt,dir); + } + + return frames; +} + +jack_nframes_t +TempoMap::bbt_duration_at_unlocked (const BBT_Time& when, const BBT_Time& bbt, int dir) const +{ + + jack_nframes_t frames = 0; + + double beats_per_bar; + BBT_Time result; + + result.bars = max(1U,when.bars + dir * bbt.bars) ; + result.beats = 1; + result.ticks = 0; + + Metric metric = metric_at(result); + beats_per_bar = metric.meter().beats_per_bar(); + + + + /*reduce things to legal bbt values + we have to handle possible fractional=shorter beats at the end of measures + and things like 0|11|9000 as a duration in a 4.5/4 measure + the musical decision is that the fractional beat is also a beat , although a shorter one + */ + + + if (dir >= 0) { + result.beats = when.beats + bbt.beats; + result.ticks = when.ticks + bbt.ticks; + + while (result.beats >= (beats_per_bar+1)) { + result.bars++; + result.beats -= (uint32_t) ceil(beats_per_bar); + metric = metric_at(result); // maybe there is a meter change + beats_per_bar = metric.meter().beats_per_bar(); + + } + /*we now counted the beats and landed in the target measure, now deal with ticks + this seems complicated, but we want to deal with the corner case of a sequence of time signatures like 0.2/4-0.7/4 + and with request like bbt = 3|2|9000 ,so we repeat the same loop but add ticks + */ + + /* of course gtk_ardour only allows bar with at least 1.0 beats ..... + */ + + uint32_t ticks_at_beat = (uint32_t) ( result.beats == ceil(beats_per_bar) ? + (1 - (ceil(beats_per_bar) - beats_per_bar))* Meter::ticks_per_beat + : Meter::ticks_per_beat ); + + while (result.ticks >= ticks_at_beat) { + result.beats++; + result.ticks -= ticks_at_beat; + if (result.beats >= (beats_per_bar+1)) { + result.bars++; + result.beats = 1; + metric = metric_at(result); // maybe there is a meter change + beats_per_bar = metric.meter().beats_per_bar(); + } + ticks_at_beat= (uint32_t) ( result.beats == ceil(beats_per_bar) ? + (1 - (ceil(beats_per_bar) - beats_per_bar) )* Meter::ticks_per_beat + : Meter::ticks_per_beat); + + } + + + } else { + uint32_t b = bbt.beats; + + /* count beats */ + while( b > when.beats ) { + + result.bars = max(1U,result.bars-- ) ; + metric = metric_at(result); // maybe there is a meter change + beats_per_bar = metric.meter().beats_per_bar(); + if (b >= ceil(beats_per_bar)) { + + b -= (uint32_t) ceil(beats_per_bar); + } else { + b = (uint32_t) ceil(beats_per_bar)- b + when.beats ; + } + } + result.beats = when.beats - b; + + /*count ticks */ + + if (bbt.ticks <= when.ticks) { + result.ticks = when.ticks - bbt.ticks; + } else { + + uint32_t ticks_at_beat= (uint32_t) Meter::ticks_per_beat; + uint32_t t = bbt.ticks - when.ticks; + + do { + + if (result.beats == 1) { + result.bars = max(1U,result.bars-- ) ; + metric = metric_at(result); // maybe there is a meter change + beats_per_bar = metric.meter().beats_per_bar(); + result.beats = (uint32_t) ceil(beats_per_bar); + ticks_at_beat = (uint32_t) ((1 - (ceil(beats_per_bar) - beats_per_bar))* Meter::ticks_per_beat) ; + } else { + result.beats --; + ticks_at_beat = (uint32_t) Meter::ticks_per_beat; + } + + if (t <= ticks_at_beat) { + result.ticks = ticks_at_beat - t; + } else { + t-= ticks_at_beat; + } + } while (t > ticks_at_beat); + + } + + + } + + if (dir < 0 ) { + frames = count_frames_between( result,when); + } else { + frames = count_frames_between(when,result); + } + + return frames; +} + + + +jack_nframes_t + +TempoMap::round_to_bar (jack_nframes_t fr, int dir) +{ + LockMonitor lm (lock, __LINE__, __FILE__); + return round_to_type (fr, dir, Bar); +} + + +jack_nframes_t + +TempoMap::round_to_beat (jack_nframes_t fr, int dir) +{ + LockMonitor lm (lock, __LINE__, __FILE__); + return round_to_type (fr, dir, Beat); +} + +jack_nframes_t + +TempoMap::round_to_beat_subdivision (jack_nframes_t fr, int sub_num) +{ + LockMonitor lm (lock, __LINE__, __FILE__); + TempoMap::BBTPointList::iterator i; + TempoMap::BBTPointList *more_zoomed_bbt_points; + jack_nframes_t frame_one_beats_worth; + jack_nframes_t pos = 0; + jack_nframes_t next_pos = 0 ; + double tempo = 1; + double frames_one_subdivisions_worth; + bool fr_has_changed = false; + + int n; + + frame_one_beats_worth = (jack_nframes_t) ::floor ((double) _frame_rate * 60 / 20 ); //one beat @ 20 bpm + more_zoomed_bbt_points = get_points((fr >= frame_one_beats_worth) ? + fr - frame_one_beats_worth : 0, fr+frame_one_beats_worth ); + + if (more_zoomed_bbt_points == 0 || more_zoomed_bbt_points->empty()) { + return fr; + } + + for (i = more_zoomed_bbt_points->begin(); i != more_zoomed_bbt_points->end(); i++) { + if ((*i).frame <= fr) { + pos = (*i).frame; + tempo = (*i).tempo->beats_per_minute(); + + } else { + i++; + next_pos = (*i).frame; + break; + } + } + frames_one_subdivisions_worth = ((double) _frame_rate * 60 / (sub_num * tempo)); + + for (n = sub_num; n > 0; n--) { + if (fr >= (pos + ((n - 0.5) * frames_one_subdivisions_worth))) { + fr = (jack_nframes_t) round(pos + (n * frames_one_subdivisions_worth)); + if (fr > next_pos) { + fr = next_pos; //take care of fractional beats that don't match the subdivision asked + } + fr_has_changed = true; + break; + } + } + + if (!fr_has_changed) { + fr = pos; + } + + delete more_zoomed_bbt_points; + return fr ; +} + +jack_nframes_t + +TempoMap::round_to_type (jack_nframes_t frame, int dir, BBTPointType type) +{ + Metric metric = metric_at (frame); + BBT_Time bbt; + BBT_Time start; + bbt_time_with_metric (frame, bbt, metric); + + switch (type) { + case Bar: + if (dir < 0) { + /* relax */ + + } else if (dir > 0) { + if (bbt.beats > 0) { + bbt.bars++; + } + } else { + if (bbt.beats > metric.meter().beats_per_bar()/2) { + bbt.bars++; + } + + } + bbt.beats = 1; + bbt.ticks = 0; + break; + + case Beat: + if (dir < 0) { + /* relax */ + } else if (dir > 0) { + if (bbt.ticks > 0) { + bbt.beats++; + } + } else { + if (bbt.ticks >= (Meter::ticks_per_beat/2)) { + bbt.beats++; + } + } + if (bbt.beats > ceil(metric.meter().beats_per_bar()) ) { + bbt.beats = 1; + bbt.bars++; + } + bbt.ticks = 0; + break; + + } + + return metric.frame() + count_frames_between (metric.start(), bbt); +} + +TempoMap::BBTPointList * +TempoMap::get_points (jack_nframes_t lower, jack_nframes_t upper) const +{ + + Metrics::const_iterator i; + BBTPointList *points; + double current; + const MeterSection* meter; + const MeterSection* m; + const TempoSection* tempo; + const TempoSection* t; + uint32_t bar; + uint32_t beat; + + meter = &first_meter (); + tempo = &first_tempo (); + + /* find the starting point */ + + for (i = metrics->begin(); i != metrics->end(); ++i) { + + if ((*i)->frame() > lower) { + break; + } + + if ((t = dynamic_cast<const TempoSection*>(*i)) != 0) { + tempo = t; + } else if ((m = dynamic_cast<const MeterSection*>(*i)) != 0) { + meter = m; + } + } + + /* We now have: + + meter -> the Meter for "lower" + tempo -> the Tempo for "lower" + i -> for first new metric after "lower", possibly metrics->end() + + Now start generating points. + */ + + if (meter->frame() > tempo->frame()) { + bar = meter->start().bars; + beat = meter->start().beats; + current = meter->frame(); + } else { + bar = tempo->start().bars; + beat = tempo->start().beats; + current = tempo->frame(); + } + + points = new BBTPointList; + + do { + double beats_per_bar; + double beat_frame; + double beat_frames; + double frames_per_bar; + jack_nframes_t limit; + + beats_per_bar = meter->beats_per_bar (); + frames_per_bar = meter->frames_per_bar (*tempo, _frame_rate); + beat_frames = tempo->frames_per_beat (_frame_rate); + + if (i == metrics->end()) { + limit = upper; + } else { + limit = (*i)->frame(); + } + + limit = min (limit, upper); + + while (current < limit) { + + /* if we're at the start of a bar, add bar point */ + + if (beat == 1) { + if (current >= lower) { + points->push_back (BBTPoint (*meter, *tempo,(jack_nframes_t)rint(current), Bar, bar, 1)); + + } + } + + /* add some beats if we can */ + + beat_frame = current; + + while (beat <= ceil( beats_per_bar) && beat_frame < limit) { + if (beat_frame >= lower) { + points->push_back (BBTPoint (*meter, *tempo, (jack_nframes_t) rint(beat_frame), Beat, bar, beat)); + } + beat_frame += beat_frames; + current+= beat_frames; + + beat++; + } + + if (beat > ceil(beats_per_bar) ) { + + /* we walked an entire bar. its + important to move `current' forward + by the actual frames_per_bar, not move it to + an integral beat_frame, so that metrics with + non-integral beats-per-bar have + their bar positions set + correctly. consider a metric with + 9-1/2 beats-per-bar. the bar we + just filled had 10 beat marks, + but the bar end is 1/2 beat before + the last beat mark. + And it is also possible that a tempo + change occured in the middle of a bar, + so we subtract the possible extra fraction from the current + */ + + current -= beat_frames * (ceil(beats_per_bar)-beats_per_bar); + bar++; + beat = 1; + + } + + } + + /* if we're done, then we're done */ + + if (current >= upper) { + break; + } + + /* i is an iterator that refers to the next metric (or none). + if there is a next metric, move to it, and continue. + */ + + if (i != metrics->end()) { + + if ((t = dynamic_cast<const TempoSection*>(*i)) != 0) { + tempo = t; + } else if ((m = dynamic_cast<const MeterSection*>(*i)) != 0) { + meter = m; + /* new MeterSection, beat always returns to 1 */ + beat = 1; + } + + ++i; + } + + } while (1); + + return points; +} + +const Tempo& +TempoMap::tempo_at (jack_nframes_t frame) +{ + Metric m (metric_at (frame)); + return m.tempo(); +} + + +const Meter& +TempoMap::meter_at (jack_nframes_t frame) +{ + Metric m (metric_at (frame)); + return m.meter(); +} + +XMLNode& +TempoMap::get_state () +{ + LockMonitor lm (lock, __LINE__, __FILE__); + Metrics::const_iterator i; + XMLNode *root = new XMLNode ("TempoMap"); + + for (i = metrics->begin(); i != metrics->end(); ++i) { + root->add_child_nocopy ((*i)->get_state()); + } + + return *root; +} + +int +TempoMap::set_state (const XMLNode& node) +{ + { + LockMonitor lm (lock, __LINE__, __FILE__); + + XMLNodeList nlist; + XMLNodeConstIterator niter; + Metrics old_metrics (*metrics); + + in_set_state = true; + + metrics->clear(); + + nlist = node.children(); + + for (niter = nlist.begin(); niter != nlist.end(); ++niter) { + XMLNode* child = *niter; + + if (child->name() == TempoSection::xml_state_node_name) { + + try { + metrics->push_back (new TempoSection (*child)); + } + + catch (failed_constructor& err){ + error << _("Tempo map: could not set new state, restoring old one.") << endmsg; + *metrics = old_metrics; + break; + } + + } else if (child->name() == MeterSection::xml_state_node_name) { + + try { + metrics->push_back (new MeterSection (*child)); + } + + catch (failed_constructor& err) { + error << _("Tempo map: could not set new state, restoring old one.") << endmsg; + *metrics = old_metrics; + break; + } + } + } + + if (niter == nlist.end()) { + + MetricSectionSorter cmp; + metrics->sort (cmp); + timestamp_metrics (); + } + + in_set_state = false; + } + + send_state_changed (Change (0)); + + return 0; +} + +void +TempoMap::dump (std::ostream& o) const +{ + const MeterSection* m; + const TempoSection* t; + + for (Metrics::const_iterator i = metrics->begin(); i != metrics->end(); ++i) { + + if ((t = dynamic_cast<const TempoSection*>(*i)) != 0) { + o << "Tempo @ " << *i << ' ' << t->beats_per_minute() << " BPM at " << t->start() << " frame= " << t->frame() << " (move? " + << t->movable() << ')' << endl; + } else if ((m = dynamic_cast<const MeterSection*>(*i)) != 0) { + o << "Meter @ " << *i << ' ' << m->beats_per_bar() << '/' << m->note_divisor() << " at " << m->start() << " frame= " << m->frame() + << " (move? " << m->movable() << ')' << endl; + } + } +} + +UndoAction +TempoMap::get_memento () const +{ + return sigc::bind (mem_fun (*(const_cast<TempoMap *> (this)), &StateManager::use_state), _current_state_id); +} + +Change +TempoMap::restore_state (StateManager::State& state) +{ + LockMonitor lm (lock, __LINE__, __FILE__); + + TempoMapState* tmstate = dynamic_cast<TempoMapState*> (&state); + + metrics = tmstate->metrics; + last_bbt_valid = false; + + return Change (0); +} + +StateManager::State* +TempoMap::state_factory (std::string why) const +{ + TempoMapState* state = new TempoMapState (why); + + for (Metrics::iterator i = metrics->begin(); i != metrics->end(); ++i) { + TempoSection *ts; + MeterSection *ms; + + if ((ts = dynamic_cast<TempoSection*>(*i)) != 0) { + state->metrics->push_back (new TempoSection (*ts)); + } else if ((ms = dynamic_cast<MeterSection*>(*i)) != 0) { + state->metrics->push_back (new MeterSection (*ms)); + } + } + + return state; +} + +void +TempoMap::save_state (std::string why) +{ + if (!in_set_state) { + StateManager::save_state (why); + } +} |