Esempio n. 1
0
	bool operator() ( const Partial & p )
	{
		double compareFreq = p.frequencyAt( timeOfPeakEnergy( p ) );
		return compareFreq >= minFreq  && compareFreq <= maxFreq;
	}
Esempio n. 2
0
// ---------------------------------------------------------------------------
//	dilate
// ---------------------------------------------------------------------------
//!	Replace the Partial envelope with a new envelope having the
//!	same Breakpoints at times computed to align temporal features
//!	in the sorted sequence of initial time points with their 
//!	counterparts the sorted sequence of target time points.
//!
//!	Depending on the specification of initial and target time 
//!	points, the dilated Partial may have Breakpoints at times
//!	less than 0, even if the original Partial did not.
//!
//!	It is possible to have duplicate time points in either sequence.
//!	Duplicate initial time points result in very localized stretching.
//!	Duplicate target time points result in very localized compression.
//!
//!	If all initial time points are greater than 0, then an implicit
//!	time point at 0 is assumed in both initial and target sequences, 
//!	so the onset of a sound can be stretched without explcitly specifying a 
//!	zero point in each vector. (This seems most intuitive, and only looks
//!	like an inconsistency if clients are using negative time points in 
//!	their Dilator, or Partials having Breakpoints before time 0, both 
//!	of which are probably unusual circumstances.)
//!
//!	\param p is the Partial to dilate.
//	
void
Dilator::dilate( Partial & p ) const
{
	debugger << "dilating Partial having " << p.numBreakpoints() 
			 << " Breakpoints" << endl;

	//	sanity check:
	Assert( _initial.size() == _target.size() );
	
	//	don't dilate if there's no time points, or no Breakpoints:
	if ( 0 == _initial.size() ||
	     0 == p.numBreakpoints() )
	{
		return;
    }
    
	//	create the new Partial:
	Partial newp;
	newp.setLabel( p.label() );
	
	//	timepoint index:
	int idx = 0;
	for ( Partial::const_iterator iter = p.begin(); iter != p.end(); ++iter )
	{
		//	find the first initial time point later 
		//	than the currentTime:
		double currentTime = iter.time();
        idx = std::distance( _initial.begin(), 
                             std::lower_bound( _initial.begin(), _initial.end(), currentTime ) );
        Assert( idx == _initial.size() || currentTime <= _initial[idx] );
        
		//	compute a new time for the Breakpoint at pIter:
		double newtime = 0;
		if ( idx == 0 ) 
		{
			//	all time points in _initial are later than 
			//	the currentTime; stretch if no zero time 
			//	point has been specified, otherwise, shift:
			if ( _initial[idx] != 0. )
				newtime = currentTime * _target[idx] / _initial[idx];
			else
				newtime = _target[idx] + (currentTime - _initial[idx]);
		}
		else if ( idx == _initial.size() ) 
		{
			//	all time points in _initial are earlier than 
			//	the currentTime; shift:
			//
			//	note: size is already known to be > 0, so
			//	idx-1 is safe
			newtime = _target[idx-1] + (currentTime - _initial[idx-1]);
		}
		else 
		{
			//	currentTime is between the time points at idx and
			//	idx-1 in _initial; shift and stretch: 
			//
			//	note: size is already known to be > 0, so
			//	idx-1 is safe
			Assert( _initial[idx-1] < _initial[idx] );	//	currentTime can't wind up 
														//	between two equal times
			
			double stretch = (_target[idx]	- _target[idx-1]) / (_initial[idx] - _initial[idx-1]);			
			newtime = _target[idx-1] + ((currentTime - _initial[idx-1]) * stretch);
		}
		
		//	add a Breakpoint at the computed time:
		newp.insert( newtime, iter.breakpoint() );
	}
	
	//	new Breakpoints need to be added to the Partial at times corresponding
	//	to all target time points that are after the first Breakpoint and
	//	before the last, otherwise, Partials may be briefly out of tune with
	//	each other, since our Breakpoints are non-uniformly distributed in time:
	for ( idx = 0; idx < _initial.size(); ++ idx )
	{
		if ( _initial[idx] <= p.startTime() )
        {
			continue;
        }
		else if ( _initial[idx] >= p.endTime() )
        {
			break;
        }
		else
		{
			newp.insert( _target[idx], 
						 Breakpoint( p.frequencyAt(_initial[idx]), p.amplitudeAt(_initial[idx]),
									 p.bandwidthAt(_initial[idx]), p.phaseAt(_initial[idx]) ) );
		}
	}
	
	//	store the new Partial:
	p = newp;
}