// ---------------------------------------------------------------------------
// distillSorter (static helper)
// ---------------------------------------------------------------------------
// Helper for sorting Partials for distilling.
//
static bool distillSorter( const Partial & lhs, const Partial & rhs )
{
double ldur = lhs.duration(), rdur = rhs.duration();
if ( ldur != rdur )
{
return ldur > rdur;
}
else
{
// What to do for same-duration Partials?
// Need to do something consistent, should look
// for energy?
return lhs.startTime() < rhs.startTime();
/*
double lpeak = PartialUtils::peakAmp( lhs );
double rpeak = PartialUtils::peakAmp( rhs );
return lhs > rhs;
*/
}
}
Iter
find_overlapping( Partial & p, double minGapTime, Iter start, Iter end)
{
for ( Iter it = start; it != end; ++it )
{
// skip if other partial is already sifted out.
if ( (*it)->label() == 0 )
continue;
// skip the source Partial:
// (identity test: compare addresses)
// (this is a sanity check, should not happen since
// src should be at position end)
Assert( (*it) != &p );
// test for overlap:
if ( p.startTime() < (*it)->endTime() + minGapTime &&
p.endTime() + minGapTime > (*it)->startTime() )
{
// Does the overlapping Partial have longer duration?
// (this should never be true, since the Partials
// are sorted by duration)
Assert( p.duration() <= (*it)->duration() );
#if Debug_Loris
debugger << "Partial starting " << p.startTime() << ", "
<< p.begin().breakpoint().frequency() << " ending "
<< p.endTime() << ", " << (--p.end()).breakpoint().frequency()
<< " zapped by overlapping Partial starting "
<< (*it)->startTime() << ", " << (*it)->begin().breakpoint().frequency()
<< " ending " << (*it)->endTime() << ", "
<< (--(*it)->end()).breakpoint().frequency() << endl;
#endif
return it;
}
}
// no overlapping Partial found:
return end;
}
// ---------------------------------------------------------------------------
// getPartial
// ---------------------------------------------------------------------------
// Convert any FileIOExceptions into ImportExceptions, so that clients can
// reasonably expect to catch only ImportExceptions.
//
static void
getPartial( std::istream & s, PartialList & partials, double bweCutoff )
{
try
{
// read the Track header:
TrackOnDisk tkHeader;
readTrackHeader( s, tkHeader );
// create a Partial:
Partial p;
p.setLabel( tkHeader.label );
// keep running phase and time for Breakpoint construction:
double phase = tkHeader.initialPhase;
// convert time to seconds and offset by a millisecond to
// allow for implied onset (Lemur analysis data was shifted
// such that the earliest Partial starts at 0).
double time = tkHeader.startTime * 0.001;
// use this to compute phases:
double prevTtnSec = 0.;
// loop: read Peak, create Breakpoint, add to Partial:
for ( int i = 0; i < tkHeader.numPeaks; ++i ) {
// read Peak:
PeakOnDisk pkData;
readPeakData( s, pkData );
double frequency = pkData.frequency;
double amplitude = pkData.magnitude;
double bandwidth = std::min( pkData.bandwidth, 1.f );
// fix bandwidth:
// Lemur used a cutoff frequency, below which
// bandwidth was ignored; Loris does not, so
// toss out that bogus bandwidth.
if ( frequency < bweCutoff ) {
amplitude *= std::sqrt(1. - bandwidth);
bandwidth = 0.;
}
// otherwise, adjust the bandwidth value
// to account for the difference in noise
// scaling between Lemur and Loris; this
// mess doubles the noise modulation index
// without changing the sine modulation index,
// see Oscillator::modulate().
else {
amplitude *= std::sqrt( 1. + (3. * bandwidth) );
bandwidth = (4. * bandwidth) / ( 1. + (3. * bandwidth) );
}
// update phase based on _this_ pkData's interpolated freq:
phase +=2. * Pi * prevTtnSec * pkData.interpolatedFrequency;
phase = std::fmod( phase, 2. * Pi );
// create Breakpoint:
Breakpoint bp( frequency, amplitude, bandwidth, phase );
// insert in Partial:
p.insert( time, bp );
// update time:
prevTtnSec = pkData.ttn * 0.001;
time += prevTtnSec;
}
if ( p.duration() > 0. ) {
partials.push_back( p );
}
/*
else {
debugger << "import rejecting a Partial of zero duration ("
<< tkHeader.numPeaks << " peaks read)" << endl;
}
*/
}
catch( FileIOException & ex ) {
ex.append( "Failed to import a partial from a Lemur file." );
throw;
}
}