ref: 4cb315f58a570ac0f640c6ea135b70fcbbf1f32f
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_initToPool(sb, length, &leaf.mempool);
}
void tBuffer_free (tBuffer* const sb)
{
tBuffer_freeFromPool(sb, &leaf.mempool);
}
void tBuffer_initToPool (tBuffer* const sb, uint32_t length, tMempool* const mp)
{
_tMempool* m = *mp;
_tBuffer* s = *sb = (_tBuffer*) mpool_alloc(sizeof(_tBuffer), m);
s->buff = (float*) mpool_alloc( sizeof(float) * length, m);
s->bufferLength = length;
s->recordedLength = 0;
s->active = 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);
mpool_free(s, m);
}
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_initToPool(sp, b, &leaf.mempool);
}
void tSampler_free (tSampler* const sp)
{
tSampler_freeFromPool(sp, &leaf.mempool);
}
void tSampler_initToPool(tSampler* const sp, tBuffer* const b, tMempool* const mp)
{
_tMempool* m = *mp;
_tSampler* p = *sp = (_tSampler*) mpool_alloc(sizeof(_tSampler), m);
_tBuffer* s = *b;
p->samp = s;
p->active = 0;
p->start = 0;
p->end = 0;
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_initToPool(&p->gain, 7.0f, 1, mp);
tRamp_setVal(&p->gain, 0.f);
p->targetstart = -1;
p->targetend = -1;
p->inCrossfade = 0;
p->flipStart = -1;
p->flipIdx = -1;
}
void tSampler_freeFromPool (tSampler* const sp, tMempool* const mp)
{
_tMempool* m = *mp;
_tSampler* p = *sp;
tRamp_freeFromPool(&p->gain, mp);
mpool_free(p, m);
}
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;
attemptStartEndChange(sp);
if (p->active == 0) return 0.f;
if ((p->inc == 0.0f) || (p->len < 2))
{
// p->inCrossfade = 1;
return p->last;
}
float sample = 0.0f;
float cfxsample = 0.0f;
float crossfadeMix = 0.0f;
float flipsample = 0.0f;
float flipMix = 0.0f;
float* buff = p->samp->buff;
// Variables so start is also before end
int32_t start = p->start;
int32_t end = p->end;
if (p->flip < 0)
{
start = p->end;
end = p->start;
}
// Get the direction and a reverse flag for some calcs
int dir = p->bnf * p->dir * p->flip;
int rev = 0;
if (dir < 0) rev = 1;
// Get the current integer index and alpha for interpolation
int idx = (int) p->idx;
float alpha = rev + (p->idx - idx) * dir;
idx += rev;
// Get the indexes for interpolation
int i1 = idx-(1*dir);
int i2 = idx;
int i3 = idx+(1*dir);
int i4 = idx+(2*dir);
int length = p->samp->recordedLength;
// Wrap as needed
i1 = (i1 < length*rev) ? i1 + (length * (1-rev)) : i1 - (length * rev);
i2 = (i2 < length*rev) ? i2 + (length * (1-rev)) : i2 - (length * rev);
i3 = (i3 < length*(1-rev)) ? i3 + (length * rev) : i3 - (length * (1-rev));
i4 = (i4 < length*(1-rev)) ? i4 + (length * rev) : i4 - (length * (1-rev));
sample = LEAF_interpolate_hermite_x (buff[i1],
buff[i2],
buff[i3],
buff[i4],
alpha);
uint32_t cfxlen = p->cfxlen;
if (p->len * 0.25f < cfxlen) cfxlen = p->len * 0.25f;
// Determine crossfade points
uint32_t fadeLeftStart = 0;
if (start >= cfxlen) fadeLeftStart = start - cfxlen;
uint32_t fadeLeftEnd = fadeLeftStart + cfxlen;
uint32_t fadeRightEnd = end;// + (fadeLeftEnd - start);
// if (fadeRightEnd >= length) fadeRightEnd = length - 1;
uint32_t fadeRightStart = fadeRightEnd - cfxlen;
if (p->mode == PlayLoop)
{
int offset = 0;
int cdx = 0;
if ((fadeLeftStart <= idx) && (idx <= fadeLeftEnd))
{
offset = fadeLeftEnd - idx;
cdx = fadeRightEnd - offset;
p->inCrossfade = 1;
}
else if ((fadeRightStart <= idx) && (idx <= fadeRightEnd))
{
offset = idx - fadeRightStart;
cdx = fadeLeftStart + offset;
p->inCrossfade = 1;
}
else p->inCrossfade = 0;
if (p->inCrossfade)
{
int c1 = cdx-(1*dir);
int c2 = cdx;
int c3 = cdx+(1*dir);
int c4 = cdx+(2*dir);
// Wrap as needed
c1 = (c1 < length * rev) ? c1 + (length * (1-rev)) : c1 - (length * rev);
c2 = (c2 < length * rev) ? c2 + (length * (1-rev)) : c2 - (length * rev);
c3 = (c3 < length * (1-rev)) ? c3 + (length * rev) : c3 - (length * (1-rev));
c4 = (c4 < length * (1-rev)) ? c4 + (length * rev) : c4 - (length * (1-rev));
cfxsample = LEAF_interpolate_hermite_x (buff[c1],
buff[c2],
buff[c3],
buff[c4],
alpha);
crossfadeMix = (float) offset / (float) cfxlen;
}
float flipLength = fabsf(p->flipIdx - p->flipStart);
if (flipLength > cfxlen)
{
p->flipStart = -1;
p->flipIdx = -1;
}
if (p->flipIdx >= 0)
{
if (p->flipStart == -1)
{
p->flipStart = p->idx;
p->flipIdx = p->idx;
}
flipLength = fabsf(p->flipIdx - p->flipStart);
int fdx = (int) p->flipIdx;
float falpha = (1-rev) - (p->flipIdx - fdx) * dir;
idx += (1-rev);
// Get the indexes for interpolation
int f1 = fdx+(1*dir);
int f2 = fdx;
int f3 = fdx-(1*dir);
int f4 = fdx-(2*dir);
// Wrap as needed
f1 = (f1 < length*(1-rev)) ? f1 + (length * rev) : f1 - (length * (1-rev));
f2 = (f2 < length*(1-rev)) ? f2 + (length * rev) : f2 - (length * (1-rev));
f3 = (f3 < length*rev) ? f3 + (length * (1-rev)) : f3 - (length * rev);
f4 = (f4 < length*rev) ? f4 + (length * (1-rev)) : f4 - (length * rev);
flipsample = LEAF_interpolate_hermite_x (buff[f1],
buff[f2],
buff[f3],
buff[f4],
falpha);
flipMix = (float) (cfxlen - flipLength) / (float) cfxlen;
}
}
float inc = fmod(p->inc, p->len);
p->idx += (dir * inc);
if (p->flipStart >= 0)
{
p->flipIdx += (-dir * inc);
if((int)p->flipIdx < 0)
{
p->idx += (float)length;
}
if((int)p->idx >= length)
{
p->idx -= (float)length;
}
}
attemptStartEndChange(sp);
if (p->mode == PlayLoop)
{
if((int)p->idx < start)
{
p->idx += (float)(fadeRightEnd - fadeLeftEnd);
}
if((int)p->idx > end)
{
p->idx -= (float)(fadeRightEnd - fadeLeftEnd);
}
}
else if (p->mode == 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;
}
}
float ticksToEnd = rev ? ((idx - start) * p->iinc) : ((end - idx) * p->iinc);
if (p->mode == PlayNormal)
{
if (ticksToEnd < (0.007f * leaf.sampleRate))
{
tRamp_setDest(&p->gain, 0.f);
p->active = -1;
}
}
sample = ((sample * (1.0f - crossfadeMix)) + (cfxsample * crossfadeMix)) * (1.0f - flipMix) + (flipsample * flipMix);
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, 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->cfxlen > (p->len * 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) // only bother with these checks if we're actually playing
{
if (start > p->end)
{
tempflip = -1;
}
else
{
tempflip = 1;
}
int dir = p->bnf * p->dir * tempflip;
uint32_t cfxlen = p->cfxlen;
if (p->len * 0.25f < cfxlen) cfxlen = p->len * 0.25f;
if (p->inCrossfade || p->flipStart >= 0)
{
p->targetstart = start;
return;
}
if ((tempflip > 0) && (dir > 0)) // start is start and we're playing forward
{
if (start > p->idx)// start given is after current index or we're in a crossfade
{
p->targetstart = start;
float tempLen = abs(p->end - start) * 0.25f;
if (cfxlen > tempLen)
{
p->cfxlen = tempLen;
}
return;
}
}
else if ((tempflip < 0) && (dir < 0)) // start is end and we're playing in reverse
{
if (start < p->idx)// start given is before current index or we're in a crossfade
{
p->targetstart = start;
float tempLen = abs(p->end - start) * 0.25f;
if (cfxlen > tempLen)
{
p->cfxlen = tempLen;
}
return;
}
}
if (tempflip != p->flip && p->flipStart < 0)
{
p->flipIdx = 0;
}
}
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) // only bother with these checks if we're actually playing
{
if (p->start > end)
{
tempflip = -1;
}
else
{
tempflip = 1;
}
int dir = p->bnf * p->dir * tempflip;
uint32_t cfxlen = p->cfxlen;
if (p->len * 0.25f < cfxlen) cfxlen = p->len * 0.25f;
if (p->inCrossfade || p->flipStart >= 0)
{
p->targetend = end;
return;
}
if (tempflip > 0 && dir < 0) // end is end and we're playing in reverse
{
if (end < p->idx) // end given is before current index or we're in a crossfade
{
p->targetend = end;
float tempLen = abs(end - p->start) * 0.25f;
if (cfxlen > tempLen)
{
p->cfxlen = tempLen;
}
return;
}
}
else if (tempflip < 0 && dir > 0) // end is start and we're playing forward
{
if (end > p->idx) // end given is after current index or we're in a crossfade
{
p->targetend = end;
float tempLen = abs(end - p->start) * 0.25f;
if (cfxlen > tempLen)
{
p->cfxlen = tempLen;
}
return;
}
}
if (tempflip != p->flip && p->flipStart < 0)
{
p->flipIdx = 0;
}
}
p->end = LEAF_clipInt(0, end, p->samp->recordedLength-1);
handleStartEndChange(sp);
p->targetend = -1;
}
void tSampler_setLength (tSampler* const sp, int32_t length)
{
_tSampler* p = *sp;
if (length == 0) length = 1;
tSampler_setEnd(sp, p->start + length);
}
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;
}
//==============================================================================
void tAutoSampler_init (tAutoSampler* const as, tBuffer* const b)
{
tAutoSampler_initToPool(as, b, &leaf.mempool);
}
void tAutoSampler_free (tAutoSampler* const as)
{
tAutoSampler_freeFromPool(as, &leaf.mempool);
}
void tAutoSampler_initToPool (tAutoSampler* const as, tBuffer* const b, tMempool* const mp)
{
_tMempool* m = *mp;
_tAutoSampler* a = *as = (_tAutoSampler*) mpool_alloc(sizeof(_tAutoSampler), m);
tBuffer_setRecordMode(b, RecordOneShot);
tSampler_initToPool(&a->sampler, b, mp);
tSampler_setMode(&a->sampler, PlayLoop);
tEnvelopeFollower_initToPool(&a->ef, 0.05f, 0.9999f, mp);
}
void tAutoSampler_freeFromPool (tAutoSampler* const as, tMempool* const mp)
{
_tMempool* m = *mp;
_tAutoSampler* a = *as;
tEnvelopeFollower_freeFromPool(&a->ef, mp);
tSampler_freeFromPool(&a->sampler, mp);
mpool_free(a, m);
}
float tAutoSampler_tick (tAutoSampler* const as, float input)
{
_tAutoSampler* a = *as;
float currentPower = tEnvelopeFollower_tick(&a->ef, input);
if ((currentPower > (a->threshold)) &&
(currentPower > a->previousPower + 0.001f) &&
(a->sampleTriggered == 0) &&
(a->sampleCounter == 0))
{
a->sampleTriggered = 1;
tBuffer_record(&a->sampler->samp);
a->sampler->samp->recordedLength = a->sampler->samp->bufferLength;
a->sampleCounter = a->windowSize + 24;//arbitrary extra time to avoid resampling while playing previous sample - better solution would be alternating buffers and crossfading
a->powerCounter = 1000;
}
if (a->sampleCounter > 0)
{
a->sampleCounter--;
}
tSampler_setEnd(&a->sampler, a->windowSize);
tBuffer_tick(&a->sampler->samp, input);
//on it's way down
if (currentPower <= a->previousPower)
{
if (a->powerCounter > 0)
{
a->powerCounter--;
}
else if (a->sampleTriggered == 1)
{
a->sampleTriggered = 0;
}
}
a->previousPower = currentPower;
return tSampler_tick(&a->sampler);
}
void tAutoSampler_setBuffer (tAutoSampler* const as, tBuffer* const b)
{
_tAutoSampler* a = *as;
tBuffer_setRecordMode(b, RecordOneShot);
if (a->windowSize > tBuffer_getBufferLength(b))
a->windowSize = tBuffer_getBufferLength(b);
tSampler_setSample(&a->sampler, b);
}
void tAutoSampler_setMode (tAutoSampler* const as, PlayMode mode)
{
_tAutoSampler* a = *as;
tSampler_setMode(&a->sampler, mode);
}
void tAutoSampler_play (tAutoSampler* const as)
{
_tAutoSampler* a = *as;
tSampler_play(&a->sampler);
}
void tAutoSampler_stop (tAutoSampler* const as)
{
_tAutoSampler* a = *as;
tSampler_stop(&a->sampler);
}
void tAutoSampler_setThreshold (tAutoSampler* const as, float thresh)
{
_tAutoSampler* a = *as;
a->threshold = thresh;
}
void tAutoSampler_setWindowSize (tAutoSampler* const as, uint32_t size)
{
_tAutoSampler* a = *as;
if (size > tBuffer_getBufferLength(&a->sampler->samp))
a->windowSize = tBuffer_getBufferLength(&a->sampler->samp);
else a->windowSize = size;
}
void tAutoSampler_setCrossfadeLength (tAutoSampler* const as, uint32_t length)
{
_tAutoSampler* a = *as;
tSampler_setCrossfadeLength(&a->sampler, length);
}
void tAutoSampler_setRate (tAutoSampler* const as, float rate)
{
;
}