Ichthyostega
38837da65e
When drafting the time handling framework some years ago, I foresaw the possible danger of mixing up numbers relating to fractional seconds, with other plain numbers intended as frame counts or as micro ticks. Thus I deliberately picked an incompatible integer type for FSecs = boost::rational<long> However, using long is problematic in itself, since its actual bit length is not fixed, and especially on 32bit platforms long is quite surprisingly defined to be the same as int. However, meanwhile, using the new C++ features, I have blocked pretty much any possible implicit conversion path, requiring explicit conversions in the relevant ctor invocations. So, after weighting in the alternatives, FSecs is now defined as boost::rational<int64_t>.
225 lines
8.4 KiB
C++
225 lines
8.4 KiB
C++
/*
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QuantiserBasics(Test) - a demo quantiser to cover the basic quantiser API
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Copyright (C) Lumiera.org
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2011, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file quantiser-basics-test.cpp
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** unit test \ref QuantiserBasics_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/test/test-helper.hpp"
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#include "lib/time/quantiser.hpp"
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#include "lib/util.hpp"
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#include <cstdlib>
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using lumiera::error::LUMIERA_ERROR_BOTTOM_VALUE;
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using util::isnil;
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using std::rand;
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namespace lib {
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namespace time{
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namespace test{
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namespace {
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const int MAX_FRAMES = 25*500;
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const int DIRT_GRAIN = 50;
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const FSecs F25(1,25); // duration of one PAL frame
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inline Time
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secs (int seconds)
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{
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return Time(FSecs(seconds));
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}
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}
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/****************************************************//**
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* @test cover the basic Quantiser API.
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* This test uses a standalone quantiser implementation
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* to demonstrate and verify the basic behaviour
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* and the usage corner cases of a quantiser.
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*
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* In this most simple form, a quantiser is defined
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* by the time reference point (origin) to use, and
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* the frame rate (grid spacing). For each raw time
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* value, the quantiser yields a time value aligned
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* at the next lower frame bound. Besides that,
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* time values are confined to be within
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* the interval (Time::MIN, Time::Max)
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*
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* @see TimeQuantisation_test
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*/
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class QuantiserBasics_test : public Test
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{
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virtual void
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run (Arg)
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{
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checkSimpleQuantisation ();
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coverQuantisationStandardCases();
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coverQuantisationCornerCases();
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}
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void
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checkSimpleQuantisation ()
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{
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FixedFrameQuantiser fixQ(25);
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int frames = (rand() % MAX_FRAMES);
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FSecs dirt = (F25 / (2 + rand() % DIRT_GRAIN));
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Time rawTime = Time(frames*F25) + Duration(dirt);
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CHECK (Time( frames *F25) <= rawTime);
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CHECK (Time((frames+1)*F25) > rawTime);
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Time quantTime (fixQ.gridAlign (rawTime));
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CHECK (Time(frames*F25) == quantTime);
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}
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/** Test Quantiser
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* allowing to use plain numbers.
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* 1 Frame == 3 micro ticks */
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struct TestQuant
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: FixedFrameQuantiser
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{
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TestQuant (int origin=0)
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: FixedFrameQuantiser( FrameRate(TimeValue::SCALE, 3 ), TimeValue(origin))
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{ }
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int
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quant (int testPoint)
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{
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TimeVar quantised = this->gridAlign(TimeValue(testPoint));
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return int(quantised);
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}
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};
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void
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coverQuantisationStandardCases()
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{
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TestQuant q0;
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TestQuant q1(1);
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CHECK ( 6 == q0.quant(7) );
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CHECK ( 6 == q0.quant(6) );
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CHECK ( 3 == q0.quant(5) );
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CHECK ( 3 == q0.quant(4) );
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CHECK ( 3 == q0.quant(3) );
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CHECK ( 0 == q0.quant(2) );
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CHECK ( 0 == q0.quant(1) );
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CHECK ( 0 == q0.quant(0) );
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CHECK (-3 == q0.quant(-1));
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CHECK (-3 == q0.quant(-2));
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CHECK (-3 == q0.quant(-3));
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CHECK (-6 == q0.quant(-4));
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CHECK ( 6 == q1.quant(7) );
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CHECK ( 3 == q1.quant(6) );
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CHECK ( 3 == q1.quant(5) );
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CHECK ( 3 == q1.quant(4) );
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CHECK ( 0 == q1.quant(3) );
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CHECK ( 0 == q1.quant(2) );
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CHECK ( 0 == q1.quant(1) );
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CHECK (-3 == q1.quant(0) );
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CHECK (-3 == q1.quant(-1));
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CHECK (-3 == q1.quant(-2));
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CHECK (-6 == q1.quant(-3));
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CHECK (-6 == q1.quant(-4));
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}
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void
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coverQuantisationCornerCases()
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{
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// origin at lower end of the time range
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FixedFrameQuantiser case1 (1, Time::MIN);
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CHECK (secs(0) == case1.gridAlign(Time::MIN ));
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CHECK (secs(0) == case1.gridAlign(Time::MIN +TimeValue(1) ));
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CHECK (secs(1) == case1.gridAlign(Time::MIN +secs(1) ));
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CHECK (Time::MAX -secs(1) > case1.gridAlign( secs(-1) ));
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CHECK (Time::MAX -secs(1) <= case1.gridAlign( secs (0) ));
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CHECK (Time::MAX > case1.gridAlign( secs (0) ));
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CHECK (Time::MAX == case1.gridAlign( secs(+1) ));
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CHECK (Time::MAX == case1.gridAlign( secs(+2) ));
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// origin at upper end of the time range
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FixedFrameQuantiser case2 (1, Time::MAX);
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CHECK (secs( 0) == case2.gridAlign(Time::MAX ));
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CHECK (secs(-1) == case2.gridAlign(Time::MAX -TimeValue(1) )); // note: next lower frame
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CHECK (secs(-1) == case2.gridAlign(Time::MAX -secs(1) )); // i.e. the same as a whole frame down
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CHECK (Time::MIN +secs(1) < case2.gridAlign( secs(+2) ));
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CHECK (Time::MIN +secs(1) >= case2.gridAlign( secs(+1) ));
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CHECK (Time::MIN < case2.gridAlign( secs(+1) ));
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CHECK (Time::MIN == case2.gridAlign( secs( 0) )); // note: because of downward truncating,
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CHECK (Time::MIN == case2.gridAlign( secs(-1) )); // resulting values will already exceed
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CHECK (Time::MIN == case2.gridAlign( secs(-2) )); // allowed range and thus will be clipped
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// maximum frame size is half the time range
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Duration hugeFrame(Time::MAX);
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FixedFrameQuantiser case3 (hugeFrame);
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CHECK (Time::MIN == case3.gridAlign(Time::MIN ));
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CHECK (Time::MIN == case3.gridAlign(Time::MIN +TimeValue(1) ));
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CHECK (Time::MIN == case3.gridAlign( secs(-1) ));
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CHECK (TimeValue(0) == case3.gridAlign( secs( 0) ));
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CHECK (TimeValue(0) == case3.gridAlign( secs(+1) ));
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CHECK (TimeValue(0) == case3.gridAlign(Time::MAX -TimeValue(1) ));
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CHECK (Time::MAX == case3.gridAlign(Time::MAX ));
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// now displacing this grid by +1sec....
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FixedFrameQuantiser case4 (hugeFrame, secs(1));
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CHECK (Time::MIN == case4.gridAlign(Time::MIN ));
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CHECK (Time::MIN == case4.gridAlign(Time::MIN +TimeValue(1) )); // clipped...
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CHECK (Time::MIN == case4.gridAlign(Time::MIN +secs(1) )); // but now exact (unclipped)
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CHECK (Time::MIN == case4.gridAlign( secs(-1) ));
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CHECK (Time::MIN == case4.gridAlign( secs( 0) ));
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CHECK (TimeValue(0) == case4.gridAlign( secs(+1) )); //.....now exactly the frame number zero
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CHECK (TimeValue(0) == case4.gridAlign(Time::MAX -TimeValue(1) ));
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CHECK (TimeValue(0) == case4.gridAlign(Time::MAX )); //.......still truncated down to frame #0
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// larger frames aren't possible
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Duration not_really_larger(secs(10000) + hugeFrame);
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CHECK (hugeFrame == not_really_larger);
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// frame sizes below the time micro grid get trapped
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long subAtomic = 2*TimeValue::SCALE; // too small for this universe...
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VERIFY_ERROR (BOTTOM_VALUE, FixedFrameQuantiser quark(subAtomic) );
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VERIFY_ERROR (BOTTOM_VALUE, FixedFrameQuantiser quark(Duration (FSecs (1,subAtomic))) );
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}
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};
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/** Register this test class... */
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LAUNCHER (QuantiserBasics_test, "unit common");
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}}} // namespace lib::time::test
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