DelayLine Class Reference

Multi-channel delay line with interpolated tap reading. More...

#include <gin_delayline.h>

Public Member Functions
	DelayLine (int channels, double maximumDelay=0.001f, double sr=44100.0f)
void	setSize (int channels, double maximumDelay, double sr)
void	clear ()
float	readLagrange (int ch, double t)
float	readLinear (int ch, double t)
float	readSample (int ch, int samplePos)
float	readSampleLagrange (int ch, float samplePos)
void	write (int ch, float input)
void	writeFinished ()

Protected Attributes
juce::AudioSampleBuffer	buffer
float *const *	data = nullptr
double	sampleRate = 44100.0
int	writePos = 0

Detailed Description

Multi-channel delay line with interpolated tap reading.

DelayLine provides a circular buffer-based delay line that supports multiple channels and fractional delay times through interpolation. It's the building block for creating delay effects, choruses, flangers, and reverbs.

Key Features:

• Multi-channel support (configurable channel count)
• Linear and Lagrange interpolation for fractional delays
• Time-based or sample-based delay reading
• Efficient circular buffer implementation
• Per-channel independent delay taps

Interpolation Methods:

• readLinear(): Fast linear interpolation (good for most uses)
• readLagrange(): Higher quality 4-point Lagrange interpolation
• readSample(): No interpolation (integer sample delays only)

Usage:

DelayLine delay(2, 2.0, 44100.0); // 2 channels, 2 seconds max, 44.1kHz
 
// Write samples
for (int ch = 0; ch < 2; ch++)
    delay.write(ch, inputSample[ch]);
delay.writeFinished();
 
// Read with fractional delay (0.5 seconds)
float delayedL = delay.readLinear(0, 0.5);
float delayedR = delay.readLinear(1, 0.5);

See also

StereoDelay

Constructor & Destructor Documentation

DelayLine()

DelayLine::DelayLine	(	int	channels,
		double	maximumDelay = 0.001f,
		double	sr = 44100.0f
	)

References setSize().

Member Function Documentation

setSize()

void DelayLine::setSize	(	int	channels,
		double	maximumDelay,
		double	sr
	)

References buffer, data, sampleRate, and writePos.

Referenced by DelayLine(), Modulation::setSampleRate(), and StereoDelay::setSampleRate().

clear()

void DelayLine::clear

(

)

References buffer, and writePos.

Referenced by Modulation::reset(), StereoDelay::reset(), and Modulation::setSampleRate().

readLagrange()

float DelayLine::readLagrange	(	int	ch,
		double	t
	)

References buffer, data, Lagrange::interpolate(), sampleRate, and writePos.

Referenced by Modulation::process(), StereoDelay::process(), and StereoDelay::processSmoothed().

readLinear()

float DelayLine::readLinear	(	int	ch,
		double	t
	)

References buffer, data, sampleRate, and writePos.

readSample()

float DelayLine::readSample	(	int	ch,
		int	samplePos
	)

References buffer, data, and writePos.

readSampleLagrange()

float DelayLine::readSampleLagrange	(	int	ch,
		float	samplePos
	)

References buffer, data, Lagrange::interpolate(), and writePos.

write()

void DelayLine::write	(	int	ch,
		float	input
	)

References data, and writePos.

Referenced by Modulation::process(), StereoDelay::process(), and StereoDelay::processSmoothed().

writeFinished()

void DelayLine::writeFinished

(

)

References buffer, and writePos.

Referenced by Modulation::process(), StereoDelay::process(), and StereoDelay::processSmoothed().

Member Data Documentation

buffer

juce::AudioSampleBuffer DelayLine::buffer

protected

Referenced by clear(), readLagrange(), readLinear(), readSample(), readSampleLagrange(), setSize(), and writeFinished().

data

float* const* DelayLine::data = nullptr

protected

Referenced by readLagrange(), readLinear(), readSample(), readSampleLagrange(), setSize(), and write().

sampleRate

double DelayLine::sampleRate = 44100.0

protected

Referenced by readLagrange(), readLinear(), and setSize().

writePos

int DelayLine::writePos = 0

protected

Referenced by clear(), readLagrange(), readLinear(), readSample(), readSampleLagrange(), setSize(), write(), and writeFinished().

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The documentation for this class was generated from the following file:

• gin_delayline.h