dsp::DelayLine Struct Reference

Basic delay line abstraction. More...

#include <delayline.hpp>

Public Member Functions
	DelayLine (void)
	Default constructor.
	DelayLine (float *ram, size_t line_size)
	Constructor with explicit memory area to use as backing buffer for delay line. More...
void	clear (void)
	Zero clear the whole delay line.
void	setMemory (float *ram, size_t line_size)
	Set the memory area to use as backing buffer for the delay line. More...
void	write (const float s)
	Write a single sample to the head of the delay line. More...
float	read (const uint32_t pos)
	Read a single sample from the delay line at given position from current write index. More...
float	readFrac (const float pos)
	Read a sample from the delay line at a fractional position from current write index. More...
float	readFracz (const uint32_t pos, const float frac)
	Read a sample from the delay line at a position from current write index with interpolation from last read. More...

Public Attributes
float *	mLine
float	mFracZ
size_t	mSize
size_t	mMask
uint32_t	mWriteIdx

Detailed Description

Basic delay line abstraction.

Definition at line 56 of file delayline.hpp.

Constructor & Destructor Documentation

DelayLine()

dsp::DelayLine::DelayLine ( float *  ram, size_t  line_size  )

inline

Constructor with explicit memory area to use as backing buffer for delay line.

Parameters

ram	Pointer to memory buffer
line_size	Size in float of memory buffer

Definition at line 84 of file delayline.hpp.

                                            :
      mLine(ram),
      mFracZ(0),
      mSize(line_size),
      mMask(line_size-1),
      mWriteIdx(0)
    { }

Member Function Documentation

read()

float dsp::DelayLine::read ( const uint32_t  pos )

inline

Read a single sample from the delay line at given position from current write index.

Parameters

pos	Offset from write index

Returns

Sample at given position from write index

Definition at line 137 of file delayline.hpp.

                                   {
      return mLine[(mWriteIdx + pos) & mMask];
    }

readFrac()

float dsp::DelayLine::readFrac ( const float  pos )

inline

Read a sample from the delay line at a fractional position from current write index.

Parameters

pos	Offset from write index as floating point.

Returns

Interpolated sample at given fractional position from write index

Definition at line 148 of file delayline.hpp.

                                    {
      const uint32_t base = (uint32_t)pos;
      const float frac = pos - base;
      const float s0 = read(base);
      const float s1 = read(base+1);
      return linintf(frac, s0, s1);
    }

readFracz()

float dsp::DelayLine::readFracz ( const uint32_t  pos, const float  frac  )

inline

Read a sample from the delay line at a position from current write index with interpolation from last read.

Parameters

pos	Offset from write index
frac	Interpolation from last read pair.

Returns

Interpolation of last read sample and sample at given position from write index.

Definition at line 164 of file delayline.hpp.

                                                          {
      const float s0 = read(pos);
      const float y = linintf(frac, s0, mFracZ);
      mFracZ = s0;
      return y;
    }

setMemory()

void dsp::DelayLine::setMemory ( float *  ram, size_t  line_size  )

inline

Set the memory area to use as backing buffer for the delay line.

Parameters

ram	Pointer to memory buffer
line_size	Size in float of memory buffer

Note

Will round size to next power of two.

Definition at line 113 of file delayline.hpp.

                                                 {
      mLine = ram;
      mSize = nextpow2_u32(line_size); // must be power of 2
      mMask = (mSize-1);
      mWriteIdx = 0;
    }

write()

void dsp::DelayLine::write ( const float  s )

inline

Write a single sample to the head of the delay line.

Parameters

s	Sample to write

Definition at line 126 of file delayline.hpp.

                              {
      mLine[(mWriteIdx--) & mMask] = s;
    }

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

• /home/etienne/Documents/_projects/logue-sdk/logue-sdk-alt/platform/minilogue-xd/inc/dsp/delayline.hpp