From e3b4fa678d26055463ada04448987f025b6cac49 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <carl@carlh.net>
Date: Sat, 10 Dec 2011 20:23:59 +0000
Subject: Fix framewalk_to_beats when it traverses more than one metric change.

git-svn-id: svn://localhost/ardour2/branches/3.0@10970 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/ardour/test/framewalk_to_beats_test.cc | 39 +++++++++++++++++++++++++++++
 libs/ardour/test/framewalk_to_beats_test.h  |  2 ++
 2 files changed, 41 insertions(+)

(limited to 'libs/ardour/test')

diff --git a/libs/ardour/test/framewalk_to_beats_test.cc b/libs/ardour/test/framewalk_to_beats_test.cc
index 6aca63c6c1..7e50aedcb5 100644
--- a/libs/ardour/test/framewalk_to_beats_test.cc
+++ b/libs/ardour/test/framewalk_to_beats_test.cc
@@ -95,3 +95,42 @@ FramewalkToBeatsTest::doubleTempoTest ()
 	CPPUNIT_ASSERT_EQUAL (r, 3.5);
 }
 
+void
+FramewalkToBeatsTest::tripleTempoTest ()
+{
+	int const sampling_rate = 48000;
+
+	TempoMap map (sampling_rate);
+	Meter meter (4, 4);
+	map.add_meter (meter, BBT_Time (1, 1, 0));
+
+	/*
+	  120bpm at bar 1, 240bpm at bar 2, 160bpm at bar 3
+	  
+	  120bpm = 24e3 samples per beat
+	  160bpm = 18e3 samples per beat
+	  240bpm = 12e3 samples per beat
+	*/
+	
+
+	/*
+	  
+	  120bpm            240bpm            160bpm
+	  0 beats           4 beats           8 beats
+	  0 frames          96e3 frames       144e3 frames
+	  |                 |                 |                 |                 |
+	  | 1.1 1.2 1.3 1.4 | 2.1 2.2 2.3.2.4 | 3.1 3.2 3.3 3.4 | 4.1 4.2 4.3 4.4 |
+
+	*/
+
+	Tempo tempoA (120);
+	map.add_tempo (tempoA, BBT_Time (1, 1, 0));
+	Tempo tempoB (240);
+	map.add_tempo (tempoB, BBT_Time (2, 1, 0));
+	Tempo tempoC (160);
+	map.add_tempo (tempoC, BBT_Time (3, 1, 0));
+
+	/* Walk from 1|3 to 4|1 */
+	double r = map.framewalk_to_beats (2 * 24e3, (2 * 24e3) + (4 * 12e3) + (4 * 18e3));
+	CPPUNIT_ASSERT_EQUAL (10.0, r);
+}
diff --git a/libs/ardour/test/framewalk_to_beats_test.h b/libs/ardour/test/framewalk_to_beats_test.h
index ae6ae646eb..4acaeaddd6 100644
--- a/libs/ardour/test/framewalk_to_beats_test.h
+++ b/libs/ardour/test/framewalk_to_beats_test.h
@@ -7,6 +7,7 @@ class FramewalkToBeatsTest : public CppUnit::TestFixture
 	CPPUNIT_TEST_SUITE (FramewalkToBeatsTest);
 	CPPUNIT_TEST (singleTempoTest);
 	CPPUNIT_TEST (doubleTempoTest);
+	CPPUNIT_TEST (tripleTempoTest);
 	CPPUNIT_TEST_SUITE_END ();
 
 public:
@@ -15,5 +16,6 @@ public:
 
 	void singleTempoTest ();
 	void doubleTempoTest ();
+	void tripleTempoTest ();
 };
 
-- 
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