From 4586b39e8b09f58fd9be504d88fa43f9f6f6344f Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Fri, 8 Aug 2025 23:11:59 -0600
Subject: [PATCH] add a method to compute tempo & meter for an audio source
 (not used yet)

---
 libs/ardour/ardour/audioregion.h |  2 ++
 libs/ardour/audioregion.cc       | 16 +++++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/libs/ardour/ardour/audioregion.h b/libs/ardour/ardour/audioregion.h
index bb078ef2f7..7f0723f5f1 100644
--- a/libs/ardour/ardour/audioregion.h
+++ b/libs/ardour/ardour/audioregion.h
@@ -291,6 +291,8 @@ class LIBARDOUR_API AudioRegion : public Region, public AudioReadable
 	int _set_state (const XMLNode&, int version, PBD::PropertyChange& what_changed, bool send_signal);
 	void send_change (const PBD::PropertyChange&);
 	void ensure_length_sanity ();
+
+	void set_tempo_stuff_from_source ();
 };
 
 } /* namespace ARDOUR */
diff --git a/libs/ardour/audioregion.cc b/libs/ardour/audioregion.cc
index 3010687d38..0637e91126 100644
--- a/libs/ardour/audioregion.cc
+++ b/libs/ardour/audioregion.cc
@@ -433,6 +433,21 @@ AudioRegion::~AudioRegion ()
 	}
 }
 
+void
+AudioRegion::set_tempo_stuff_from_source ()
+{
+	samplecnt_t data_size = _session.sample_rate() * 10;
+	std::unique_ptr<Sample> data (new Sample[data_size]);
+
+	if (read (data.get(), 0, data_size, 0) == data_size) {
+		double tempo;
+		double beatcount;
+
+		estimate_audio_tempo (shared_from_this(), data.get(), data_size, _session.sample_rate(), tempo, _meter, beatcount);
+		_tempo = Temporal::Tempo (tempo, 4);
+	}
+}
+
 void
 AudioRegion::post_set (const PropertyChange& /*ignored*/)
 {
@@ -2740,4 +2755,3 @@ AudioRegion::ensure_length_sanity ()
 		_length = timecnt_t (timepos_t (_length.val().samples()), _length.val().position());
 	}
 }
-