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/*
Copyright (C) 2012 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.
*/
#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];
/* Read from the playlist */
_audio_playlist->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);
}
float fade_in[128];
float fade_out[128];
_ar[1]->fade_in()->curve().get_vector (0, 128, fade_in, 128);
_ar[1]->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 */
_ar[0]->set_default_fade_in ();
_ar[0]->set_default_fade_out ();
_ar[1]->set_default_fade_out ();
_playlist->add_region (_r[0], 0);
_r[0]->set_length (256);
_playlist->add_region (_r[1], 128);
_r[1]->set_length (256);
/* Check that the right fades have been set up */
CPPUNIT_ASSERT_EQUAL (false, _ar[0]->fade_in_is_xfade ());
CPPUNIT_ASSERT_EQUAL (false, _ar[0]->fade_out_is_xfade ());
CPPUNIT_ASSERT_EQUAL (true, _ar[1]->fade_in_is_xfade ());
CPPUNIT_ASSERT_EQUAL (false, _ar[1]->fade_out_is_xfade ());
/* Check that the read comes back correctly */
check_crossfade ();
/* Combine the two regions */
RegionList rl;
rl.push_back (_r[0]);
rl.push_back (_r[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 ();
}
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