From c0c3fd07c99424f335910996867eb788fa0b6dc4 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Fri, 26 Feb 2021 12:21:13 -0700
Subject: [PATCH] libtemporal: add timecnt_t::end() and
 timecnt_t::set_time_domain()

---
 libs/temporal/temporal/timeline.h |  4 ++
 libs/temporal/timeline.cc         | 71 +++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)

diff --git a/libs/temporal/temporal/timeline.h b/libs/temporal/temporal/timeline.h
index 1c971ce125..abc433ef13 100644
--- a/libs/temporal/temporal/timeline.h
+++ b/libs/temporal/temporal/timeline.h
@@ -324,6 +324,9 @@ class LIBTEMPORAL_API timecnt_t {
 	int62_t const & distance() const { return _distance; }
 	timepos_t const & position() const { return _position; }
 	timepos_t const & origin() const { return _position; } /* alias */
+	timepos_t end (TimeDomain) const;
+	timepos_t end () const { return end (time_domain()); }
+
 	void set_position (timepos_t const &pos);
 
 	bool positive() const { return _distance.val() > 0; }
@@ -336,6 +339,7 @@ class LIBTEMPORAL_API timecnt_t {
 	timecnt_t abs() const;
 
 	Temporal::TimeDomain time_domain () const { return _distance.flagged() ? BeatTime : AudioTime; }
+	void set_time_domain (Temporal::TimeDomain);
 
 	superclock_t    superclocks() const { if (!_distance.flagged()) return _distance.val(); return compute_superclocks(); }
 	int64_t         samples() const { return superclock_to_samples (superclocks(), TEMPORAL_SAMPLE_RATE); }
diff --git a/libs/temporal/timeline.cc b/libs/temporal/timeline.cc
index fef497fed8..65789989fa 100644
--- a/libs/temporal/timeline.cc
+++ b/libs/temporal/timeline.cc
@@ -81,6 +81,77 @@ timecnt_t::timecnt_t (timecnt_t const & tc, timepos_t const & pos)
 	_distance = tc.distance();
 }
 
+
+timepos_t
+timecnt_t::end (TimeDomain return_domain) const
+{
+	if (_distance.flagged() && _position.time_domain() == BeatTime && return_domain == BeatTime) {
+		/* everything in BeatTime, so just add */
+		return timepos_t (_position.beats() + Beats::ticks (magnitude()));
+	}
+
+	if (!_distance.flagged() && _position.time_domain() == AudioTime && return_domain == AudioTime) {
+		/* everything in AudioTime, so just add */
+		return timepos_t::from_superclock (_position.superclocks() + magnitude());
+	}
+
+	if (_distance.flagged()) { /* _distance in beats */
+
+		if (_position.time_domain() == BeatTime) {
+
+			/* distance & position in beats, so return must be audio (all 3 as beats is handled above) */
+			return timepos_t::from_superclock (TempoMap::use()->superclock_at ( _position.beats() + Beats::ticks (magnitude())));
+
+		} else if (_position.time_domain() == AudioTime) {
+
+			const Beats b = TempoMap::use()->quarters_at_superclock (_position.superclocks() + magnitude());
+
+			if (return_domain == BeatTime) {
+				return timepos_t (b);
+			} else {
+				return timepos_t::from_superclock (TempoMap::use()->superclock_at (b));
+			}
+		}
+
+	} else { /* _distance in audio time */
+
+		if (_position.time_domain() == AudioTime) {
+			/* distance & position in audio, so return must be beats (all 3 as audio is handled above) */
+			return timepos_t (TempoMap::use()->quarters_at_superclock (_position.superclocks() + magnitude()));
+
+		} else if (_position.time_domain() == BeatTime) {
+
+			const superclock_t sc = TempoMap::use()->superclock_at (_position.beats()) + magnitude();
+
+			if (return_domain == AudioTime) {
+				return timepos_t::from_superclock (sc);
+			} else {
+				return timepos_t (TempoMap::use()->quarters_at_superclock (sc));
+			}
+		}
+	}
+
+	/*NOTREACHED*/
+}
+
+void
+timecnt_t::set_time_domain (TimeDomain td)
+{
+	if (time_domain() == td) {
+		return;
+	}
+
+	_position.set_time_domain (td);
+
+	if (_distance.flagged()) {
+		/* beats -> superclock */
+		_distance = int62_t (false, TempoMap::use()->superclock_at (Beats::ticks (magnitude())));
+	} else {
+		/* superclock -> beats */
+		_distance = int62_t (true, TempoMap::use()->quarters_at_superclock (magnitude()).to_ticks());
+	}
+}
+
 void
 timecnt_t::set_position (timepos_t const & pos)
 {