ref: cb6284e95107db310a8b4193f15fa6e45941a5d7
dir: /LEAF/Inc/leaf-pitch.h/
/*
==============================================================================
leaf-pitch.h
Created: 30 Nov 2018 11:03:13am
Author: airship
==============================================================================
*/
#ifndef LEAF_PITCH_H_INCLUDED
#define LEAF_PITCH_H_INCLUDED
#ifdef __cplusplus
extern "C" {
#endif
//==============================================================================
#include "leaf-globals.h"
#include "leaf-math.h"
#include "leaf-filter.h"
#include "leaf-utilities.h"
//==============================================================================
#define DEFPITCHRATIO 2.0f
#define DEFTIMECONSTANT 100.0f
#define DEFHOPSIZE 64
#define DEFWINDOWSIZE 64
#define FBA 20
#define HPFREQ 40.0f
//==============================================================================
/* tSOLAD : pitch shifting algorithm that underlies tPitchShifter etc */
#define LOOPSIZE (2048*2) // (4096*2) // loop size must be power of two
#define LOOPMASK (LOOPSIZE - 1)
#define PITCHFACTORDEFAULT 1.0f
#define INITPERIOD 64.0f
#define MAXPERIOD (float)((LOOPSIZE - w->blocksize) * 0.8f)
#define MINPERIOD 8.0f
typedef struct _tSOLAD
{
uint16_t timeindex; // current reference time, write index
uint16_t blocksize; // signal input / output block size
float pitchfactor; // pitch factor between 0.25 and 4
float readlag; // read pointer's lag behind write pointer
float period; // period length in input signal
float jump; // read pointer jump length and direction
float xfadelength; // crossfade length expressed at input sample rate
float xfadevalue; // crossfade phase and value
float delaybuf[LOOPSIZE+16];
} tSOLAD;
void tSOLAD_init (tSOLAD* const);
void tSOLAD_free (tSOLAD* const);
// send one block of input samples, receive one block of output samples
void tSOLAD_ioSamples (tSOLAD *w, float* in, float* out, int blocksize);
// set periodicity analysis data
void tSOLAD_setPeriod (tSOLAD *w, float period);
// set pitch factor between 0.25 and 4
void tSOLAD_setPitchFactor (tSOLAD *w, float pitchfactor);
// force readpointer lag
void tSOLAD_setReadLag (tSOLAD *w, float readlag);
// reset state variables
void tSOLAD_resetState (tSOLAD *w);
//==============================================================================
// tSNAC: period detector
#define SNAC_FRAME_SIZE 1024 // default analysis framesize // should be the same as (or smaller than?) PS_FRAME_SIZE
#define DEFOVERLAP 1 // default overlap
#define DEFBIAS 0.2f // default bias
#define DEFMINRMS 0.003f // default minimum RMS
#define SEEK 0.85f // seek-length as ratio of framesize
typedef struct _tSNAC
{
float inputbuf[SNAC_FRAME_SIZE];
float processbuf[SNAC_FRAME_SIZE * 2];
float spectrumbuf[SNAC_FRAME_SIZE / 2];
float biasbuf[SNAC_FRAME_SIZE];
uint16_t timeindex;
uint16_t framesize;
uint16_t overlap;
uint16_t periodindex;
float periodlength;
float fidelity;
float biasfactor;
float minrms;
} tSNAC;
void tSNAC_init (tSNAC* const, int overlaparg); // constructor
void tSNAC_free (tSNAC* const); // destructor
void tSNAC_ioSamples (tSNAC *s, float *in, float *out, int size);
void tSNAC_setOverlap (tSNAC *s, int lap);
void tSNAC_setBias (tSNAC *s, float bias);
void tSNAC_setMinRMS (tSNAC *s, float rms);
/*To get freq, perform SAMPLE_RATE/snac_getperiod() */
float tSNAC_getPeriod (tSNAC *s);
float tSNAC_getfidelity (tSNAC *s);
//==============================================================================
// Pitch shifter
typedef struct _tPitchShifter
{
tEnv env;
tSNAC snac;
tSOLAD sola;
tHighpass hp;
float* inBuffer;
float* outBuffer;
int frameSize;
int bufSize;
int framesPerBuffer;
int curBlock;
int lastBlock;
int index;
uint16_t hopSize;
uint16_t windowSize;
uint8_t fba;
float pitchFactor;
float timeConstant;
float radius;
float max;
float lastmax;
float deltamax;
} tPitchShifter;
void tPitchShifter_init (tPitchShifter* const, float* in, float* out, int bufSize, int frameSize);
void tPitchShifter_free (tPitchShifter* const);
float tPitchShifter_tick (tPitchShifter* const, float sample);
float tPitchShifterToFreq_tick (tPitchShifter* const, float sample, float freq);
float tPitchShifterToFunc_tick (tPitchShifter* const, float sample, float (*fun)(float));
void tPitchShifter_ioSamples_toFreq (tPitchShifter* const, float* in, float* out, int size, float toFreq);
void tPitchShifter_ioSamples_toPeriod(tPitchShifter* const, float* in, float* out, int size, float toPeriod);
void tPitchShifter_ioSamples_toFunc (tPitchShifter* const, float* in, float* out, int size, float (*fun)(float));
void tPitchShifter_setPitchFactor (tPitchShifter* const, float pf);
void tPitchShifter_setTimeConstant (tPitchShifter* const, float tc);
void tPitchShifter_setHopSize (tPitchShifter* const, int hs);
void tPitchShifter_setWindowSize (tPitchShifter* const, int ws);
float tPitchShifter_getPeriod (tPitchShifter* const);
//==============================================================================
// Period detection
typedef struct _tPeriod
{
tEnv env;
tSNAC snac;
float* inBuffer;
float* outBuffer;
int frameSize;
int bufSize;
int framesPerBuffer;
int curBlock;
int lastBlock;
int i;
int indexstore;
int iLast;
int index;
float period;
uint16_t hopSize;
uint16_t windowSize;
uint8_t fba;
float timeConstant;
float radius;
float max;
float lastmax;
float deltamax;
}tPeriod;
void tPeriod_init (tPeriod* const, float* in, float* out, int bufSize, int frameSize);
void tPeriod_free (tPeriod* const);
float tPeriod_findPeriod (tPeriod* const, float sample);
void tPeriod_setHopSize (tPeriod* p, int hs);
void tPeriod_setWindowSize (tPeriod* p, int ws);
//==============================================================================
// Pitch shift
typedef struct _tPitchShift
{
tSOLAD sola;
tHighpass hp;
tPeriod* p;
float* outBuffer;
int frameSize;
int bufSize;
int framesPerBuffer;
int curBlock;
int lastBlock;
int index;
float pitchFactor;
float timeConstant;
float radius;
} tPitchShift;
void tPitchShift_init (tPitchShift* const, tPeriod* const, float* out, int bufSize);
void tPitchShift_free (tPitchShift* const);
float tPitchShift_shift (tPitchShift* const);
float tPitchShift_shiftToFunc (tPitchShift* const, float (*fun)(float));
float tPitchShift_shiftToFreq (tPitchShift* const, float freq);
void tPitchShift_setPitchFactor (tPitchShift* const, float pf);
//==============================================================================
#ifdef __cplusplus
}
#endif
#endif // LEAF_PITCH_H_INCLUDED
//==============================================================================