ref: 61205ba2be7fbb6b695eb0bdfa8ffc0ed365ac0b
dir: /LEAF/Src/leaf-sampling.c/
/*
==============================================================================
leaf-sampling.c
Created: 20 Jan 2017 12:02:17pm
Author: Michael R Mulshine
==============================================================================
*/
#if _WIN32 || _WIN64
#include "..\Inc\leaf-sampling.h"
#include "..\leaf.h"
#else
#include "../Inc/leaf-sampling.h"
#include "../leaf.h"
#endif
//==============================================================================
void tBuffer_init (tBuffer* const sb, uint32_t length)
{
_tBuffer* s = *sb = (_tBuffer*) leaf_alloc(sizeof(_tBuffer));
s->buff = (float*) leaf_alloc( sizeof(float) * length);
s->length = length;
s->active = 0;
s->idx = 0;
s->mode = RecordOneShot;
tBuffer_clear(sb);
}
void tBuffer_free (tBuffer* const sb)
{
_tBuffer* s = *sb;
leaf_free(s->buff);
leaf_free(s);
}
void tBuffer_tick (tBuffer* const sb, float sample)
{
_tBuffer* s = *sb;
if (s->active == 1)
{
s->buff[s->idx] = sample;
s->idx += 1;
if (s->idx >= s->length)
{
if (s->mode == RecordOneShot)
{
tBuffer_stop(sb);
}
else if (s->mode == RecordLoop)
{
s->idx = 0;
}
}
}
}
void tBuffer_read(tBuffer* const sb, float* buff, uint32_t len)
{
_tBuffer* s = *sb;
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 sb, int idx)
{
_tBuffer* s = *sb;
if ((idx < 0) || (idx >= s->length)) return 0.f;
return s->buff[idx];
}
void tBuffer_record(tBuffer* const sb)
{
_tBuffer* s = *sb;
s->active = 1;
s->idx = 0;
}
void tBuffer_stop(tBuffer* const sb)
{
_tBuffer* s = *sb;
s->active = 0;
}
int tBuffer_getRecordPosition(tBuffer* const sb)
{
_tBuffer* s = *sb;
return s->idx;
}
void tBuffer_setRecordMode (tBuffer* const sb, RecordMode mode)
{
_tBuffer* s = *sb;
s->mode = mode;
}
void tBuffer_clear (tBuffer* const sb)
{
_tBuffer* s = *sb;
for (int i = 0; i < s->length; i++)
{
s->buff[i] = 0.f;
}
}
uint32_t tBuffer_getLength(tBuffer* const sb)
{
_tBuffer* s = *sb;
return s->length;
}
//================================tSampler=====================================
static void handleStartEndChange(tSampler* const sp);
static void attemptStartEndChange(tSampler* const sp);
static void updateStartEnd(tSampler* const sp);
void tSampler_init(tSampler* const sp, tBuffer* const b)
{
_tSampler* p = *sp = (_tSampler*) leaf_alloc(sizeof(_tSampler));
_tBuffer* s = *b;
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->bnf = 1;
p->mode = PlayNormal;
p->cfxlen = 500; // default 300 sample crossfade
tRamp_init(&p->gain, 7.0f, 1);
tRamp_setVal(&p->gain, 0.f);
p->targetstart = -1;
p->targetend = -1;
}
void tSampler_free (tSampler* const sp)
{
_tSampler* p = *sp;
tRamp_free(&p->gain);
leaf_free(p);
}
void tSampler_setSample (tSampler* const sp, tBuffer* const b)
{
_tSampler* p = *sp;
_tBuffer* s = *b;
p->samp = s;
}
float tSampler_tick (tSampler* const sp)
{
_tSampler* p = *sp;
if (p->active == 0) return 0.f;
if ((p->inc == 0.0f) || (p->len < 4))
{
updateStartEnd(sp);
return p->last;
}
// attemptStartEndChange(sp);
float sample = 0.f;
float cfxsample = 0.f;
float numticks;
float g1 = 1.f, g2 = 0.f;
float* buff = p->samp->buff;
int dir = p->bnf * p->dir * p->flip;
int idx, revidx;
float alpha, revalpha;
idx = (int) p->idx;
alpha = p->idx - idx;
revidx = idx + 1;// we think this is because flooring on int works different when reading backwards
revalpha = 1.f - alpha;
int32_t start = p->start, end = p->end;
if (p->flip < 0)
{
start = p->end;
end = p->start;
}
uint32_t cfxlen = p->cfxlen;
if (p->len < cfxlen) cfxlen = 0;//p->len;
int length = p->samp->length;
// Check dir (direction) to interpolate properly
if (dir > 0)
{
// FORWARD NORMAL SAMPLE
int i1 = ((idx-1) < 0) ? 0 : idx-1;
int i3 = ((idx+1) >= length) ? (idx) : (idx+1);
int i4 = ((idx+2) >= length) ? (length-1) : (idx+2);
sample = LEAF_interpolate_hermite (buff[i1],
buff[idx],
buff[i3],
buff[i4],
alpha);
// num samples to end of loop
numticks = (end-idx) * p->iinc;
// if (numticks > cfxlen)
// {
// updateStartEnd(sp);
// start = p->start;
// end = p->end;
// if (p->flip < 0)
// {
// start = p->end;
// end = p->start;
// }
// numticks = (end-idx) * p->iinc;
// }
//numsamps = (dir > 0) ? (end - idx) : (idx - start);
//numsamps *= p->iinc;
if (p->mode == PlayLoop)
{
if (numticks <= (float) cfxlen)
{
// CROSSFADE SAMPLE
int cdx = start - numticks * p->inc;
if (cdx < 1)
{
cdx = -cdx;
i1 = ((cdx+1) >= length) ? (length-1) : cdx+1;
i3 = ((cdx-1) < 0) ? cdx : (cdx-1);
i4 = ((cdx-2) < 0) ? 0 : (cdx-2);
cfxsample = LEAF_interpolate_hermite (buff[i1],
buff[cdx],
buff[i3],
buff[i4],
revalpha);
}
else
{
i1 = ((cdx-1) < 0) ? 0 : cdx-1;
i3 = ((cdx+1) >= length) ? (cdx) : (cdx+1);
i4 = ((cdx+2) >= length) ? (length-1) : (cdx+2);
cfxsample = LEAF_interpolate_hermite (buff[i1],
buff[cdx],
buff[i3],
buff[i4],
alpha);
}
g2 = (float) (cfxlen - numticks) / (float) cfxlen;
}
}
}
else
{
// REVERSE
int i1 = ((revidx+1) >= length) ? (length-1) : revidx+1;
int i3 = ((revidx-1) < 0) ? revidx : (revidx-1);
int i4 = ((revidx-2) < 0) ? 0 : (revidx-2);
sample = LEAF_interpolate_hermite (buff[i1],
buff[revidx],
buff[i3],
buff[i4],
revalpha);
numticks = (revidx-start) * p->iinc;
// still get clicks i think because updating start/end can put us in the middle of a crossfade
// if (numticks > cfxlen)
// {
// updateStartEnd(sp);
// start = p->start;
// end = p->end;
// if (p->flip < 0)
// {
// start = p->end;
// end = p->start;
// }
// numticks = (revidx-start) * p->iinc;
// }
if (p->mode == PlayLoop)
{
if (numticks <= (float) cfxlen)
{
// CROSSFADE SAMPLE
int cdx = end + numticks * p->inc;
if (cdx > p->samp->length - 2)
{
cdx = end - numticks * p->inc;
i1 = ((cdx-1) < 0) ? 0 : cdx-1;
i3 = ((cdx+1) >= length) ? (cdx) : (cdx+1);
i4 = ((cdx+2) >= length) ? (length-1) : (cdx+2);
cfxsample = LEAF_interpolate_hermite (buff[i1],
buff[cdx],
buff[i3],
buff[i4],
alpha);
}
else
{
i1 = ((cdx+1) >= length) ? (length-1) : cdx+1;
i3 = ((cdx-1) < 0) ? cdx : (cdx-1);
i4 = ((cdx-2) < 0) ? 0 : (cdx-2);
cfxsample = LEAF_interpolate_hermite (buff[i1],
buff[cdx],
buff[i3],
buff[i4],
revalpha);
}
g2 = (float) (cfxlen - numticks) / (float) cfxlen;
}
}
}
float inc = fmod(p->inc, p->len);
p->idx += (dir * inc);
// attemptStartEndChange(sp);
if (p->mode == PlayNormal)
{
if (numticks < (0.007f * leaf.sampleRate))
{
tRamp_setDest(&p->gain, 0.f);
p->active = -1;
}
}
else if (p->mode == PlayLoop)
{
// mike's suggestion: make sure idx is within bounds of start and end (instead of targetstart/targetend stuff)
if (idx < start)
{
updateStartEnd(sp);
p->idx += (float)(p->len);
}
else if (idx > end)
{
updateStartEnd(sp);
p->idx -= (float)(p->len);
}
}
else // == PlayBackAndForth
{
if (p->idx < start)
{
updateStartEnd(sp);
p->bnf = -p->bnf;
p->idx = start;
}
else if (p->idx > end)
{
updateStartEnd(sp);
p->bnf = -p->bnf;
p->idx = end;
}
}
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)
{
if (p->retrigger == 1)
{
p->active = 1;
p->retrigger = 0;
tRamp_setDest(&p->gain, 1.f);
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;
}
}
else
{
p->active = 0;
}
}
}
p->last = sample;
return p->last;
}
void tSampler_setMode (tSampler* const sp, PlayMode mode)
{
_tSampler* p = *sp;
p->mode = mode;
}
void tSampler_setCrossfadeLength (tSampler* const sp, uint32_t length)
{
_tSampler* p = *sp;
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 sp)
{
_tSampler* p = *sp;
if (p->active != 0)
{
p->active = -1;
p->retrigger = 1;
tRamp_setDest(&p->gain, 0.f);
}
else
{
p->active = 1;
p->retrigger = 0;
tRamp_setDest(&p->gain, 1.f);
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;
}
}
}
void tSampler_stop (tSampler* const sp)
{
_tSampler* p = *sp;
p->active = -1;
tRamp_setDest(&p->gain, 0.f);
}
static void handleStartEndChange(tSampler* const sp)
{
_tSampler* p = *sp;
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;
}
}
static void attemptStartEndChange(tSampler* const sp)
{
_tSampler* p = *sp;
// Try to update start/end if needed
if (p->targetstart >= 0)
{
tSampler_setStart(sp, p->targetstart);
}
if (p->targetend >= 0)
{
tSampler_setEnd(sp, p->targetend);
}
}
static void updateStartEnd(tSampler* const sp)
{
_tSampler* p = *sp;
if (p->targetstart >= 0)
{
p->start = p->targetstart;
handleStartEndChange(sp);
p->targetstart = -1;
}
if (p->targetend >= 0)
{
p->end = p->targetend;
handleStartEndChange(sp);
p->targetend = -1;
}
}
void tSampler_setStart (tSampler* const sp, int32_t start)
{
_tSampler* p = *sp;
if (p->active)
{
int dir = p->bnf * p->dir * p->flip;
uint32_t cfxlen = (p->len < p->cfxlen) ? 0 : p->cfxlen;
if (p->flip > 0 && dir > 0) // start is start and we're playing forward
{
if ((start > p->idx) || (p->end-p->idx <= cfxlen)) // start given is after current index or we're in a crossfade
{
p->targetstart = start;
return;
}
}
else if (p->flip < 0 && dir < 0) // start is end and we're playing in reverse
{
if ((start < p->idx) || (p->idx-p->end <= cfxlen)) // start given is before current index or we're in a crossfade
{
p->targetstart = start;
return;
}
}
}
p->start = LEAF_clipInt(0, start, p->samp->length - 1);
handleStartEndChange(sp);
p->targetstart = -1;
}
void tSampler_setEnd (tSampler* const sp, int32_t end)
{
_tSampler* p = *sp;
if (p->active)
{
int dir = p->bnf * p->dir * p->flip;
uint32_t cfxlen = (p->len < p->cfxlen) ? 0 : p->cfxlen;
if (p->flip > 0 && dir < 0) // end is end and we're playing in reverse
{
if ((end < p->idx) || (p->idx-p->start <= cfxlen)) // end given is before current index or we're in a crossfade
{
p->targetend = end;
return;
}
}
else if (p->flip < 0 && dir > 0) // end is start and we're playing forward
{
if ((end > p->idx) || (p->start-p->idx <= cfxlen)) // end given is after current index or we're in a crossfade
{
p->targetend = end;
return;
}
}
}
p->end = LEAF_clipInt(0, end, (p->samp->length - 1));
handleStartEndChange(sp);
p->targetend = -1;
}
void tSampler_setRate (tSampler* const sp, float rate)
{
_tSampler* p = *sp;
if (rate < 0.f)
{
rate = -rate;
p->dir = -1;
}
else
{
p->dir = 1;
}
p->inc = rate; //LEAF_clip(0.f, rate, 8.0f); any reason to clip this?
p->iinc = 1.f / p->inc;
}
//==============================================================================