ref: 3e8b48269bcafe4574c93ada7f67f3a7652b2479
dir: /LEAF/Src/leaf-sample.c/
/*
==============================================================================
LEAFUtilities.c
Created: 20 Jan 2017 12:02:17pm
Author: Michael R Mulshine
==============================================================================
*/
#if _WIN32 || _WIN64
#include "..\Inc\leaf-sample.h"
#include "..\leaf.h"
#else
#include "../Inc/leaf-sample.h"
#include "../leaf.h"
#endif
//==============================================================================
void tBuffer_init (tBuffer* const s, uint32_t length)
{
s->buff = (float*) leaf_alloc( sizeof(float) * length);
s->length = length;
s->active = 0;
s->idx = 0;
s->mode = RecordOneShot;
tBuffer_clear(s);
}
void tBuffer_free (tBuffer* const s)
{
leaf_free(s->buff);
leaf_free(s);
}
void tBuffer_tick (tBuffer* const s, float sample)
{
if (s->active == 1)
{
s->buff[s->idx] = sample;
s->idx += 1;
if (s->idx >= s->length)
{
if (s->mode == RecordOneShot)
{
tBuffer_stop(s);
}
else if (s->mode == RecordLoop)
{
s->idx = 0;
}
}
}
}
void tBuffer_read(tBuffer* const s, float* buff, uint32_t len)
{
for (int i = 0; i < s->length; i++)
{
if (i < len) s->buff[i] = buff[i];
else s->buff[i] = 0.f;
}
}
float tBuffer_get (tBuffer* const s, int idx)
{
if ((idx < 0) || (idx >= s->length)) return 0.f;
return s->buff[idx];
}
void tBuffer_record(tBuffer* const s)
{
s->active = 1;
s->idx = 0;
}
void tBuffer_stop(tBuffer* const s)
{
s->active = 0;
}
void tBuffer_setRecordMode (tBuffer* const s, RecordMode mode)
{
s->mode = mode;
}
void tBuffer_clear (tBuffer* const s)
{
for (int i = 0; i < s->length; i++)
{
s->buff[i] = 0.f;
}
}
//================================tSampler=====================================
void tSampler_init (tSampler* const p, tBuffer* s)
{
p->samp = s;
p->active = 0;
p->start = 0;
p->end = p->samp->length - 1;
p->len = p->end - p->start;
p->idx = 0.f;
p->inc = 1.f;
p->iinc = 1.f;
p->dir = 1;
p->flip = 1;
p->mode = Normal;
p->cfxlen = 300; // default 300 sample crossfade
tRamp_init(&p->gain, 7.0f, 1);
tRamp_setVal(&p->gain, 0.f);
}
void tSampler_free (tSampler* const p)
{
leaf_free(p->samp);
leaf_free(p);
}
float tSampler_tick (tSampler* const p)
{
if (p->active == 0 || (p->len < 4)) return 0.f;
float sample = 0.f;
float cfxsample = 0.f;
int numsamps;
float g1 = 1.f, g2 = 0.f;
float* buff = p->samp->buff;
int dir = p->dir * p->flip;
int idx;
float alpha;
if (dir > 0)
{
idx = (int) p->idx;
alpha = p->idx - idx;
}
else
{
idx = (int) (p->idx + 1.f); // we think this is because flooring on int works different when reading backwards
alpha = (p->idx+1.f) - idx;
}
int32_t start = p->start, end = p->end;
if (p->flip < 0)
{
start = p->end;
end = p->start;
}
// Check dir (direction) to interpolate properly
if (dir > 0)
{
// FORWARD NORMAL SAMPLE
int i1 = idx-1;
int i3 = idx+1;
int i4 = idx+2;
sample = LEAF_interpolate_hermite (buff[i1],
buff[idx],
buff[i3],
buff[i4],
alpha);
// num samples to end of loop
numsamps = (dir > 0) ? (end - idx) : (idx - start);
numsamps *= p->iinc;
if (p->mode == Loop)
{
if (numsamps <= p->cfxlen)
{
// CROSSFADE SAMPLE
float idxx = p->idx - p->len;
int cdx = (int)(idxx);
i1 = cdx-1;
i3 = cdx+1;
i4 = cdx+2;
cfxsample = LEAF_interpolate_hermite (buff[i1],
buff[cdx],
buff[i3],
buff[i4],
alpha);
g2 = (float) (p->cfxlen - numsamps) / (float) p->cfxlen;
}
}
}
else
{
// REVERSE
int i1 = idx+1;
int i3 = idx-1;
int i4 = idx-2;
sample = LEAF_interpolate_hermite (buff[i1],
buff[idx],
buff[i3],
buff[i4],
1.0f-alpha);
numsamps = (idx - start) / p->inc;
if (p->mode == Loop)
{
if (numsamps <= p->cfxlen)
{
// CROSSFADE SAMPLE
float idxx = p->idx + p->len + 1.f;
int cdx = (int)(idxx);
alpha = idxx - cdx;
i1 = cdx+1;
i3 = cdx-1;
i4 = cdx-2;
cfxsample = LEAF_interpolate_hermite (buff[i1],
buff[cdx],
buff[i3],
buff[i4],
1.f-alpha);
g2 = (float) (p->cfxlen - numsamps) / (float) p->cfxlen;
}
}
}
p->idx += (dir * p->inc);
if (p->mode == Normal)
{
if (numsamps == 0) p->active = 0;
}
else if (p->mode == Loop ) // == Normal or Loop
{
if (idx <= start)
{
p->idx += (float)(p->len);
}
else if (idx >= end)
{
p->idx -= (float)(p->len);
}
}
else // == BackAndForth
{
if ((idx <= start) || (idx >= end))
{
p->dir = -p->dir;
p->idx += (p->dir * p->flip * p->inc);
}
}
g1 = 1.f - g2;
sample = sample * g1 + cfxsample * g2;
sample = sample * tRamp_tick(&p->gain);
if (p->active < 0)
{
if (tRamp_sample(&p->gain) <= 0.00001f)
{
p->active = 0;
}
}
return sample;
}
void tSampler_setSample (tSampler* const p, tBuffer* s)
{
p->samp = s;
}
void tSampler_setMode (tSampler* const p, Mode mode)
{
p->mode = mode;
}
void tSampler_setCrossfadeLength (tSampler* const p, uint32_t length)
{
uint32_t cfxlen = LEAF_clip(0, length, 1000);
//if (cfxlen > p->len) cfxlen = p->len * 0.25f;
p->cfxlen = cfxlen;
}
void tSampler_play (tSampler* const p)
{
p->active = 1;
if (p->dir > 0)
{
if (p->flip > 0) p->idx = p->start;
else p->idx = p->end;
}
else
{
if (p->flip > 0) p->idx = p->end;
else p->idx = p->start;
}
tRamp_setVal(&p->gain, 0.f);
tRamp_setDest(&p->gain, 1.f);
}
void tSampler_stop (tSampler* const p)
{
p->active = -1;
tRamp_setDest(&p->gain, 0.f);
}
static void handleStartEndChange(tSampler* const p)
{
p->len = abs(p->end - p->start);
//if (p->len < p->cfxlen) p->cfxlen = p->len * 0.9f;
if (p->start > p->end)
{
p->flip = -1;
}
else
{
p->flip = 1;
}
}
void tSampler_setStart (tSampler* const p, int32_t start)
{
p->start = LEAF_clipInt(0, start, (p->samp->length - 1));
handleStartEndChange(p);
}
void tSampler_setEnd (tSampler* const p, int32_t end)
{
p->end = LEAF_clipInt(0, end, (p->samp->length - 1));
handleStartEndChange(p);
}
void tSampler_setRate (tSampler* const p, float rate)
{
if (rate < 0.f)
{
rate = -rate;
p->dir = -1;
}
else
{
p->dir = 1;
}
p->inc = LEAF_clip(0.f, rate, 8.0f);
p->iinc = 1.f / p->inc;
}
//==============================================================================