// set parameter by value (fix16)
void module_set_param(u32 idx, pval v) {
switch(idx) {
case eParamAmp:
filter_1p_fix16_in(ampLp, v.fix);
break;
case eParamDry:
dry = v.fix;
break;
case eParamTime:
set_time(v.fix);
break;
case eParamRate:
filter_1p_fix16_in(rateLp, v.fix);
break;
case eParamFb:
fb = FIX16_FRACT_TRUNC(v.fix);
break;
case eParamAmpSmooth:
filter_1p_fix16_set_hz(ampLp, v.fix);
break;
case eParamTimeSmooth:
filter_1p_fix16_set_hz(timeLp, v.fix);
break;
case eParamRateSmooth:
filter_1p_fix16_set_hz(rateLp, v.fix);
break;
default:
break;
}
}
// read
fract32 buffer_tapN_read(bufferTapN *tap) {
fract32 a, b;
fix16 tmp;
#if 1
if(tap->divCount == 0) {
return tap->buf->data[tap->idx];
} else { // interpolate during phase-division
a = tap->buf->data[tap->idx];
if( (tap->idx + 1) >= tap->loop) {
b = tap->buf->data[0];
} else {
b = tap->buf->data[ tap->idx + 1 ];
}
tmp = FRACT_FIX16( sub_fr1x32(b, a) );
tmp = fix16_mul(tmp, fix16_from_int(tap->divCount));
return add_fr1x32(a, FIX16_FRACT_TRUNC(tmp));
}
#else
return tap->buf->data[tap->idx];
#endif
}
// convert
void fix16_to_fix32(fix16* in, fix32* out) {
out->fr = FIX16_FRACT_TRUNC(*in);
out->i = (s32)(FIX16_TO_S16(*in));
}
// frame calculation
static void calc_frame(void) {
// ----- smoothers:
// amp
amp = filter_1p_fix16_next(ampLp);
// time
if(timeLp->sync) {
;;
} else {
time = filter_1p_fix16_next(timeLp);
buffer_tap_sync(&tapRd, &tapWr, time);
#if ARCH_LINUX
if(dbgFlag) {
fprintf(dbgFile, "%d \t %f \r\n",
dbgCount,
fix16_to_float(time)
);
dbgCount++;
}
#endif
}
// rate
//// NOTE: setting a different rate is pretty much pointless in this simple application.
/// leaving it in just to test fractional interpolation methods.
if(rateLp->sync) {
;;
} else {
rate = filter_1p_fix16_next(rateLp);
buffer_tap_set_rate(&tapRd, rate);
buffer_tap_set_rate(&tapWr, rate);
}
// get interpolated echo value
echoVal = buffer_tap_read(&tapRd);
/* // store interpolated input+fb value */
// buffer_tap_write(&tapWr, add_fr1x32(in0, mult_fr1x32x32(echoVal, fb ) ) );
buffer_tap_write(&tapWr, add_fr1x32(in0 >> 1, mult_fr1x32x32(echoVal, fb ) ) );
//FIXME: clip / saturate input buf here
//// potentially, scale input by inverse feedback
/// test: no fb
//buffer_tap_write(&tapWr, in0);
/* // output */
frameVal = add_fr1x32(
mult_fr1x32x32( echoVal, FIX16_FRACT_TRUNC(amp) ),
mult_fr1x32x32( in0, FIX16_FRACT_TRUNC(dry) )
);
//// test: no dry
// frameVal = echoVal;
/// FIXME: clip here
buffer_tap_next(&tapRd);
buffer_tap_next(&tapWr);
}