Test combination of regions.

git-svn-id: svn://localhost/ardour2/branches/3.0@12637 d708f5d6-7413-0410-9779-e7cbd77b26cf

2 files changed, 140 insertions, 0 deletions

diff --git a/libs/ardour/test/combine_regions_test.cc b/libs/ardour/test/combine_regions_test.cc
new file mode 100644
index 0000000000..65650558bf
--- /dev/null
+++ b/libs/ardour/test/combine_regions_test.cc
@@ -0,0 +1,126 @@
+#include "combine_regions_test.h"
+#include "ardour/types.h"
+#include "ardour/audioplaylist.h"
+#include "ardour/region.h"
+#include "ardour/audioregion.h"
+#include "evoral/Curve.hpp"
+
+CPPUNIT_TEST_SUITE_REGISTRATION (CombineRegionsTest);
+
+using namespace std;
+using namespace ARDOUR;
+
+void
+CombineRegionsTest::check_crossfade ()
+{
+	ARDOUR::Sample buf[512];
+	ARDOUR::Sample mbuf[512];
+	float gbuf[512];
+
+	boost::shared_ptr<AudioPlaylist> apl = boost::dynamic_pointer_cast<AudioPlaylist> (_playlist);
+
+	/* Read from the playlist */
+	apl->read (buf, mbuf, gbuf, 0, 256 * 2 - 128, 0);
+
+	/* region[0]'s fade in */
+	for (int i = 0; i < 64; ++i) {
+		float const fade = i / (double) 63;
+		float const r0 = i * fade;
+		CPPUNIT_ASSERT_DOUBLES_EQUAL (r0, buf[i], 1e-16);
+	}
+
+	/* Some more of region[0] */
+	for (int i = 64; i < 128; ++i) {
+		CPPUNIT_ASSERT_DOUBLES_EQUAL (i, buf[i], 1e-16);
+	}
+
+	boost::shared_ptr<AudioRegion> ar0 = boost::dynamic_pointer_cast<AudioRegion> (_region[0]);
+	boost::shared_ptr<AudioRegion> ar1 = boost::dynamic_pointer_cast<AudioRegion> (_region[1]);
+	
+	float fade_in[128];
+	float fade_out[128];
+	
+	ar1->fade_in()->curve().get_vector (0, 128, fade_in, 128);
+	ar1->inverse_fade_in()->curve().get_vector (0, 128, fade_out, 128);
+	
+	/* Crossfading region[0] to region[1] using region[1]'s fade in and inverse fade in.
+	   region[0] also has a standard region fade out to add to the fun.
+	*/
+	for (int i = 128; i < 256; ++i) {
+		
+		float region_fade_out = 1;
+		if (i >= 192) {
+			/* Ardour fades out from 1 to VERY_SMALL_SIGNAL, which is 0.0000001,
+			   so this fade out expression is a little long-winded.
+			*/
+			region_fade_out = (((double) 1 - 0.0000001) / 63) * (255 - i) + 0.0000001;
+		}
+
+		/* This computation of r0 cannot be compressed into one line, or there
+		   is a small floating point `error'
+		*/
+		float r0 = i * region_fade_out;
+		r0 *= fade_out[i - 128];
+		
+		float const r1 = (i - 128) * fade_in[i - 128];
+		CPPUNIT_ASSERT_DOUBLES_EQUAL (r0 + r1, buf[i], 1e-16);
+	}
+
+	/* Rest of region[1] */
+	for (int i = 256; i < (384 - 64); ++i) {
+		CPPUNIT_ASSERT_DOUBLES_EQUAL (i - 128, buf[i], 1e-16);
+	}
+
+	/* And region[1]'s fade out */
+	for (int i = (384 - 64); i < 384; ++i) {
+		float const fade_out = (((double) 1 - 0.0000001) / 63) * (383 - i) + 0.0000001;
+		CPPUNIT_ASSERT_DOUBLES_EQUAL ((i - 128) * fade_out, buf[i], 1e-16);
+	}
+}
+
+void
+CombineRegionsTest::crossfadeTest ()
+{
+	/* Two regions, both 256 frames in length, overlapping by 128 frames in the middle */
+
+	boost::shared_ptr<AudioRegion> ar0 = boost::dynamic_pointer_cast<AudioRegion> (_region[0]);
+	ar0->set_name ("ar0");
+	boost::shared_ptr<AudioRegion> ar1 = boost::dynamic_pointer_cast<AudioRegion> (_region[1]);
+	ar1->set_name ("ar1");
+
+	ar0->set_default_fade_in ();
+	ar0->set_default_fade_out ();
+	ar1->set_default_fade_out ();
+	
+	_playlist->add_region (_region[0], 0);
+	_region[0]->set_length (256);
+
+	_playlist->add_region (_region[1], 128);
+	_region[1]->set_length (256);
+
+	/* Check that the right fades have been set up */
+
+	CPPUNIT_ASSERT_EQUAL (false, ar0->fade_in_is_xfade ());
+	CPPUNIT_ASSERT_EQUAL (false, ar0->fade_out_is_xfade ());
+	CPPUNIT_ASSERT_EQUAL (true, ar1->fade_in_is_xfade ());
+	CPPUNIT_ASSERT_EQUAL (false, ar1->fade_out_is_xfade ());
+
+	/* Check that the read comes back correctly */
+	
+	check_crossfade ();
+
+	/* Combine the two regions */
+
+	RegionList rl;
+	rl.push_back (_region[0]);
+	rl.push_back (_region[1]);
+	_playlist->combine (rl);
+
+	/* ...so we just have the one region... */
+	CPPUNIT_ASSERT_EQUAL ((uint32_t) 1, _playlist->n_regions ());
+
+	/* And reading should give the same thing */
+
+	check_crossfade ();
+}
+
diff --git a/libs/ardour/test/combine_regions_test.h b/libs/ardour/test/combine_regions_test.h
new file mode 100644
index 0000000000..e1778430c0
--- /dev/null
+++ b/libs/ardour/test/combine_regions_test.h
@@ -0,0 +1,14 @@
+#include "test_needing_playlist_and_regions.h"
+
+class CombineRegionsTest : public TestNeedingPlaylistAndRegions
+{
+	CPPUNIT_TEST_SUITE (CombineRegionsTest);
+	CPPUNIT_TEST (crossfadeTest);
+	CPPUNIT_TEST_SUITE_END ();
+
+public:
+	void crossfadeTest ();
+
+private:
+	void check_crossfade ();
+};