dsp::DualDelayLine Struct Reference

Dual channel delay line abstraction with interleaved samples. More...

#include <delayline.hpp>

Public Member Functions
	DualDelayLine (void)
	Default constructor.
	DualDelayLine (f32pair_t *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 (f32pair_t *ram, size_t line_size)
	Set the memory area to use as backing buffer for the delay line. More...
void	write (const f32pair_t &p)
	Write a sample pair to the delay line. More...
f32pair_t	read (const uint32_t pos)
	Read a sample pair from the delay line at given position from current write index. More...
f32pair_t	readFrac (const float pos)
	Read a sample pair from the delay line at a fractional position from current write index. More...
f32pair_t	readFracz (const uint32_t pos, const float frac)
	Read a sample pair from the delay line at a position from current write index with interpolation from last read. More...
float	read0 (const uint32_t pos)
	Read a single sample from the delay line's primary channel at given position from current write index. More...
float	read1 (const uint32_t pos)
	Read a single sample from the delay line's secondary channel at given position from current write index. More...
float	read0Frac (const float pos)
	Read a single sample from the delay line's primary channel at a fractional position from current write index. More...
float	read0Fracz (const uint32_t pos, const float frac)
	Read a single sample from the delay line's primary channel at a position from current write index with interpolation from last read. More...
float	read1Frac (const float pos)
	Read a single sample from the delay line's secondary channel at a fractional position from current write index. More...
float	read1Fracz (const uint32_t pos, const float frac)
	Read a single sample from the delay line's secondary channel at a position from current write index with interpolation from last read. More...

Public Attributes
f32pair_t *	mLine
f32pair_t	mFracZ
size_t	mSize
size_t	mMask
uint32_t	mWriteIdx

Detailed Description

Dual channel delay line abstraction with interleaved samples.

Definition at line 187 of file delayline.hpp.

Constructor & Destructor Documentation

DualDelayLine()

dsp::DualDelayLine::DualDelayLine ( f32pair_t *  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 pairs of memory buffer

Definition at line 215 of file delayline.hpp.

                                                    :
      mWriteIdx(0)
    {
      setMemory(ram, line_size);
    }

Member Function Documentation

read()

f32pair_t dsp::DualDelayLine::read ( const uint32_t  pos )

inline

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

Parameters

pos	Offset from write index

Returns

Sample pair at given position from write index

Definition at line 266 of file delayline.hpp.

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

read0()

float dsp::DualDelayLine::read0 ( const uint32_t  pos )

inline

Read a single sample from the delay line's primary channel at given position from current write index.

Parameters

pos	Offset from write index.

Returns

Sample at given position from write index

Definition at line 308 of file delayline.hpp.

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

read0Frac()

float dsp::DualDelayLine::read0Frac ( const float  pos )

inline

Read a single sample from the delay line's primary channel 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 330 of file delayline.hpp.

                                     {
      const int32_t base = (uint32_t)pos;
      const float frac = pos - base;
      const float f0 = read0(base);
      const float f1 = read0(base+1);
      return linintf(frac, f0, f1);
    }

read0Fracz()

float dsp::DualDelayLine::read0Fracz ( const uint32_t  pos, const float  frac  )

inline

Read a single sample from the delay line's primary channel 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 346 of file delayline.hpp.

                                                           {
      const float f0 = read0(pos);
      const float y = linintf(frac, f0, mFracZ.a);
      mFracZ.a = f0;
      return y;
    }

read1()

float dsp::DualDelayLine::read1 ( const uint32_t  pos )

inline

Read a single sample from the delay line's secondary channel at given position from current write index.

Parameters

pos	Offset from write index.

Returns

Sample at given position from write index

Definition at line 319 of file delayline.hpp.

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

read1Frac()

float dsp::DualDelayLine::read1Frac ( const float  pos )

inline

Read a single sample from the delay line's secondary channel 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 360 of file delayline.hpp.

                                     {
      const int32_t base = (uint32_t)pos;
      const float frac = pos - base;
      const float f0 = read1(base);
      const float f1 = read1(base+1);
      return linintf(frac, f0, f1);
    }

read1Fracz()

float dsp::DualDelayLine::read1Fracz ( const uint32_t  pos, const float  frac  )

inline

Read a single sample from the delay line's secondary channel 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 376 of file delayline.hpp.

                                                           {
      const float f0 = read1(pos);
      const float y = linintf(frac, f0, mFracZ.b);
      mFracZ.b = f0;
      return y;
    }

readFrac()

f32pair_t dsp::DualDelayLine::readFrac ( const float  pos )

inline

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

Parameters

pos	Offset from write index as floating point.

Returns

Interpolated sample pair at given fractional position from write index

Definition at line 277 of file delayline.hpp.

                                        {
      const int32_t base = (uint32_t)pos;
      const float frac = pos - base;
      const f32pair_t p0 = read(base);
      const f32pair_t p1 = read(base+1);
        
      return f32pair_linint(frac, p0, p1); 
    }

readFracz()

f32pair_t dsp::DualDelayLine::readFracz ( const uint32_t  pos, const float  frac  )

inline

Read a sample pair 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 pair and sample pair at given position from write index.

Definition at line 294 of file delayline.hpp.

                                                              {
      const f32pair_t p0 = read(pos);
      const f32pair_t y = f32pair_linint(frac, p0, mFracZ);
      mFracZ = p0;
      return y;
    }

setMemory()

void dsp::DualDelayLine::setMemory ( f32pair_t *  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 pairs of memory buffer

Note

Will round size to next power of two.

Definition at line 242 of file delayline.hpp.

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

write()

void dsp::DualDelayLine::write ( const f32pair_t &  p )

inline

Write a sample pair to the delay line.

Parameters

p	Reference to float pair.

Definition at line 255 of file delayline.hpp.

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

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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