ref: 765bd487689586be946653397bcaf6d08cdbd4cc
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->bufferLength = length;
s->recordedLength = 0;
s->active = 0;
s->idx = 0;
s->mode = RecordOneShot;
}
void tBuffer_free (tBuffer* const sb)
{
_tBuffer* s = *sb;
leaf_free(s->buff);
leaf_free(s);
}
void tBuffer_initToPool (tBuffer* const sb, uint32_t length, tMempool* const mp)
{
_tMempool* m = *mp;
_tBuffer* s = *sb = (_tBuffer*) mpool_alloc(sizeof(_tBuffer), m->pool);
s->buff = (float*) mpool_alloc( sizeof(float) * length, m->pool);
s->bufferLength = length;
s->recordedLength = 0;
s->idx = 0;
s->mode = RecordOneShot;
}
void tBuffer_freeFromPool (tBuffer* const sb, tMempool* const mp)
{
_tMempool* m = *mp;
_tBuffer* s = *sb;
mpool_free(s->buff, m->pool);
mpool_free(s, m->pool);
}
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->bufferLength)
{
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->bufferLength; i++)
{
if (i < len) s->buff[i] = buff[i];
else s->buff[i] = 0.f;
}
s->recordedLength = len;
}
float tBuffer_get (tBuffer* const sb, int idx)
{
_tBuffer* s = *sb;
if ((idx < 0) || (idx >= s->bufferLength)) 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;
s->recordedLength = s->idx;
}
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->bufferLength; i++)
{
s->buff[i] = 0.f;
}
}
uint32_t tBuffer_getBufferLength(tBuffer* const sb)
{
_tBuffer* s = *sb;
return s->bufferLength;
}
uint32_t tBuffer_getRecordedLength(tBuffer* const sb)
{
_tBuffer* s = *sb;
return s->recordedLength;
}
//================================tSampler=====================================
static void handleStartEndChange(tSampler* const sp);
static void attemptStartEndChange(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->bufferLength - 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;
p->start = 0;
p->end = p->samp->bufferLength - 1;
p->len = p->end - p->start;
p->idx = 0.f;
}
volatile uint32_t errorState = 0;
float tSampler_tick (tSampler* const sp)
{
_tSampler* p = *sp;
if (p->active == 0) return 0.f;
if ((p->inc == 0.0f) || (p->len == 0))
{
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 idx, revidx;
float alpha, revalpha;
int32_t start = p->start;
int32_t end = p->end;
if (p->flip < 0)
{
start = p->end;
end = p->start;
}
int dir = p->bnf * p->dir * p->flip;
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;
uint32_t cfxlen = p->cfxlen;
if (p->len < cfxlen) cfxlen = p->len * 0.25f;//p->len;
int length = p->samp->recordedLength;
if (dir > 0)
{ // num samples (hopping the increment size) to end of loop
numticks = (end-idx) * p->iinc;
}
else
{
numticks = (revidx-start) * p->iinc;
}
// 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_x (buff[i1],
buff[idx],
buff[i3],
buff[i4],
alpha);
if (cfxlen > 0)// necessary to avoid divide by zero, also a waste of computation otherwise
{
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_x (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_x (buff[i1],
buff[cdx],
buff[i3],
buff[i4],
alpha);
}
g2 = (float) (cfxlen - numticks) / (float) cfxlen;
}
}
}
else
{
g2 = 0.0f;
}
}
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_x (buff[i1],
buff[revidx],
buff[i3],
buff[i4],
revalpha);
if (cfxlen > 0)// necessary to avoid divide by zero, also a waste of computation otherwise
{
if (p->mode == PlayLoop)
{
if (numticks <= (float) cfxlen)
{
// CROSSFADE SAMPLE
int cdx = end + (numticks * p->inc);
if (cdx > length - 2)
{
//the problem with the click is here --- at some point it crosses this threshold and jumps from a point near the boundary to a point far away from the boundary - that's not correct
///// ooooops
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_x (buff[i1],
buff[cdx],
buff[i3],
buff[i4],
revalpha);
}
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_x (buff[i1],
buff[cdx],
buff[i3],
buff[i4],
alpha);
}
g2 = (float) (cfxlen - numticks) / (float) cfxlen;
}
}
}
else
{
g2 = 0.0f;
}
}
float inc = fmod(p->inc, p->len);
p->idx += (dir * inc);
//handle start and end cases for looping and back and forth modes
if (p->mode == PlayLoop)
{
while((int)p->idx < start)
{
p->idx += (float)(p->len);
}
while((int)p->idx > end)
{
p->idx -= (float)(p->len);
}
}
else // == PlayBackAndForth
{
if (p->idx < start)
{
p->bnf = -p->bnf;
p->idx = start + 1;
}
else if (p->idx > end)
{
p->bnf = -p->bnf;
p->idx = end - 1;
}
}
//handle very short fade out for end of one-shot normal playback
if (p->mode == PlayNormal)
{
if (numticks < (0.007f * leaf.sampleRate))
{
tRamp_setDest(&p->gain, 0.f);
p->active = -1;
}
}
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;
}
}
}
if (fabsf(sample-p->last) > 0.1f)
{
errorState = 1;
}
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 * 0.25f)) 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;
}
handleStartEndChange(&p);
}
}
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 * 0.25f)) p->cfxlen = p->len * 0.25f;
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);
}
}
void tSampler_setStart (tSampler* const sp, int32_t start)
{
_tSampler* p = *sp;
int tempflip;
if (start == p->end)
{
return;
}
// if (p->active)
{
if (start > p->end)
{
tempflip = -1;
}
else
{
tempflip = 1;
}
int dir = p->bnf * p->dir * tempflip;
uint32_t cfxlen = (p->len < p->cfxlen) ? 0 : p->cfxlen;
if ((tempflip > 0) && (dir > 0)) // start is start and we're playing forward
{
if (((start > p->idx) || (p->end-p->idx <= cfxlen)) && (start > p->end))// start given is after current index or we're in a crossfade
{
p->targetstart = start;
return;
}
}
else if ((tempflip < 0) && (dir < 0)) // start is end and we're playing in reverse
{
if (((start < p->idx) || (p->idx-p->end <= cfxlen)) && (start < p->end))// start given is before current index or we're in a crossfade
{
p->targetstart = start;
return;
}
}
}
p->start = LEAF_clipInt(0, start, p->samp->recordedLength - 1);
handleStartEndChange(sp);
p->targetstart = -1;
}
void tSampler_setEnd (tSampler* const sp, int32_t end)
{
_tSampler* p = *sp;
int tempflip;
if (end == p->start)
{
return;
}
//if (p->active)
{
if (p->start > end)
{
tempflip = -1;
}
else
{
tempflip = 1;
}
int dir = p->bnf * p->dir * tempflip;
uint32_t cfxlen = (p->len < p->cfxlen) ? 0 : p->cfxlen;
if (tempflip > 0 && dir < 0) // end is end and we're playing in reverse
{
if (((end < p->idx) || (p->idx-p->start <= cfxlen)) && (end < p->start)) // end given is before current index or we're in a crossfade
{
p->targetend = end;
return;
}
}
else if (tempflip < 0 && dir > 0) // end is start and we're playing forward
{
if (((end > p->idx) || (p->start-p->idx <= cfxlen)) && (end > p->start)) // end given is after current index or we're in a crossfade
{
p->targetend = end;
return;
}
}
}
p->end = LEAF_clipInt(0, end, (p->samp->recordedLength - 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;
p->iinc = 1.f / p->inc;
}
//==============================================================================