ref: f42ea7f0f61c638d45eaa92782798c69f0d7b86c
dir: /LEAF/Inc/leaf-analysis.h/
/*==============================================================================
leaf-analysis.h
Created: 25 Oct 2019 10:30:52am
Author: Matthew Wang
==============================================================================*/
#ifndef LEAF_ANALYSIS_H_INCLUDED
#define LEAF_ANALYSIS_H_INCLUDED
#ifdef __cplusplus
extern "C" {
#endif
//==============================================================================
#include "leaf-global.h"
#include "leaf-mempool.h"
#include "leaf-math.h"
#include "leaf-filters.h"
//==============================================================================
/* Envelope Follower */
typedef struct _tEnvelopeFollower
{
float y;
float a_thresh;
float d_coeff;
} tEnvelopeFollower;
void tEnvelopeFollower_init (tEnvelopeFollower* const, float attackThreshold, float decayCoeff);
void tEnvelopeFollower_free (tEnvelopeFollower* const);
float tEnvelopeFollower_tick (tEnvelopeFollower* const, float x);
int tEnvelopeFollower_decayCoeff (tEnvelopeFollower* const, float decayCoeff);
int tEnvelopeFollower_attackThresh (tEnvelopeFollower* const, float attackThresh);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* PowerEnvelopeFollower */
typedef struct _tPowerFollower {
float factor, oneminusfactor;
float curr;
} tPowerFollower;
void tPowerFollower_init (tPowerFollower* const, float factor);
void tPowerFollower_free (tPowerFollower* const);
float tPowerFollower_tick (tPowerFollower* const, float input);
float tPowerFollower_sample (tPowerFollower* const);
int tPowerFollower_setFactor (tPowerFollower* const, float factor);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
// ENV~ from PD, modified for LEAF
#define MAXOVERLAP 32
#define INITVSTAKEN 64
#define ENV_WINDOW_SIZE 1024
#define ENV_HOP_SIZE 256
typedef struct _tEnvPD
{
float buf[ENV_WINDOW_SIZE + INITVSTAKEN];
uint16_t x_phase; /* number of points since last output */
uint16_t x_period; /* requested period of output */
uint16_t x_realperiod; /* period rounded up to vecsize multiple */
uint16_t x_npoints; /* analysis window size in samples */
float x_result; /* result to output */
float x_sumbuf[MAXOVERLAP]; /* summing buffer */
float x_f;
uint16_t windowSize, hopSize, blockSize;
uint16_t x_allocforvs; /* extra buffer for DSP vector size */
} tEnvPD;
void tEnvPD_init (tEnvPD* const, int windowSize, int hopSize, int blockSize);
void tEnvPD_free (tEnvPD* const);
float tEnvPD_tick (tEnvPD* const);
void tEnvPD_processBlock (tEnvPD* const, float* in);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* tAttackDetection */
#define DEFBLOCKSIZE 1024
#define DEFTHRESHOLD 6
#define DEFATTACK 10
#define DEFRELEASE 10
typedef struct _tAttackDetection
{
float env;
//Attack & Release times in msec
int atk;
int rel;
//Attack & Release coefficients based on times
float atk_coeff;
float rel_coeff;
int blocksize;
int samplerate;
//RMS amplitude of previous block - used to decide if attack is present
float prevAmp;
float threshold;
} tAttackDetection;
void tAttackDetection_init (tAttackDetection* const, int blocksize);
void tAttackDetection_init_expanded (tAttackDetection* const, int blocksize, int atk, int rel);
void tAttackDetection_free (tAttackDetection* const);
// set expected input blocksize
void tAttackDetection_setBlocksize (tAttackDetection* const, int size);
// change atkDetector sample rate
void tAttackDetection_setSamplerate (tAttackDetection* const, int inRate);
// set attack time and coeff
void tAttackDetection_setAtk (tAttackDetection* const, int inAtk);
// set release time and coeff
void tAttackDetection_setRel (tAttackDetection* const, int inRel);
// set level above which values are identified as attacks
void tAttackDetection_setThreshold (tAttackDetection* const, float thres);
// find largest transient in input block, return index of attack
int tAttackDetection_detect (tAttackDetection* const, float *in);
//==============================================================================
// 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;
float* processbuf;
float* spectrumbuf;
float* biasbuf;
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);
#define DEFPITCHRATIO 2.0f
#define DEFTIMECONSTANT 100.0f
#define DEFHOPSIZE 64
#define DEFWINDOWSIZE 64
#define FBA 20
#define HPFREQ 40.0f
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
// Period detection
typedef struct _tPeriodDetection
{
tEnvPD 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;
}tPeriodDetection;
void tPeriodDetection_init (tPeriodDetection* const, float* in, float* out, int bufSize, int frameSize);
void tPeriodDetection_free (tPeriodDetection* const);
float tPeriodDetection_findPeriod (tPeriodDetection* const, float sample);
void tPeriodDetection_setHopSize (tPeriodDetection* p, int hs);
void tPeriodDetection_setWindowSize (tPeriodDetection* p, int ws);
//==============================================================================
#ifdef __cplusplus
}
#endif
#endif // LEAF_ANALYSIS_H_INCLUDED
//==============================================================================