void distort(sample &buf, float amount) {
if (amount>=0.99) amount = 0.99;
float k=2*amount/(1-amount);
for(unsigned int i=0; i<buf.get_length(); i++)
{
buf[i]=((1+k)*buf[i]/(1+k*fabs(buf[i])))*(1-amount);
}
}
void moving_hard_clip(sample &buf, const sample &level)
{
for(unsigned int i=0; i<buf.get_length(); i++)
{
float l=fabs(level[i]);
if (feq(l,0,0.0001)) l=0.0001;
if (buf[i]>l) buf[i]=l;
if (buf[i]<-l) buf[i]=-l;
buf[i]*=1/l;
}
}
void hard_clip(sample &buf, float level)
{
if (feq(level,0,0.0001)) level==0.0001;
for(unsigned int i=0; i<buf.get_length(); i++)
{
if (buf[i]>level) buf[i]=level;
if (buf[i]<-level) buf[i]=-level;
buf[i]*=1/level;
}
}
void moving_distort(sample &buf, const sample &amount)
{
for(unsigned int i=0; i<buf.get_length(); i++)
{
float a =fabs(amount[i]);
if (a>0.99) a = 0.99;
float k=2*a/(1-a);
buf[i]=((1+k)*buf[i]/(1+k*fabs(buf[i])))*(1-a);
}
}
void crush(sample &buf, float freq, float bits) {
float step = pow((float)0.5,(float)bits);
float phasor = 1;
float last = 0;
for(unsigned int i=0; i<buf.get_length(); i++) {
phasor = phasor + freq;
if (phasor >= 1.0) {
phasor = phasor - 1.0;
last = step * floor( buf[i]/step + 0.5 );
}
buf[i] = last;
}
}