Lookahead limiter
fabs(in_2[pos]) ? fabs(in_1[pos]) :
fabs(in_2[pos]);
//sig = lin2db(sig) - limit;
sig = CO_DB(sig) - limit;
if (sig > 0.0f && sig / (float)delay > peak / (float)peak_dist) {
peak_dist = delay;
peak = sig;
}
/* Incremenatlly approach the correct attenuation for the next peak */
atten -= (atten - peak) / (float)(peak_dist + 1);
if (peak_dist-- == 0) {
peak_dist = delay;
peak = 0.0f;
}
gain = 1.0f / db2lin(atten);
buffer_write(out_1[pos], buffer[(buffer_pos * 2 - delay * 2) &
(buffer_len - 1)] * gain);
buffer_write(out_2[pos], buffer[(buffer_pos * 2 - delay * 2 + 1) &
(buffer_len - 1)] * gain);
/* Ensure that the signal really can't be over the limit, potentially
* changes in the lookahead time could cause us to miss peaks */
#if 0
XXX FIXME XXX
if (out_1[pos] < -max) {
buffer_write(out_1[pos], -max);
} else if (out_1[pos] > max) {
buffer_write(out_1[pos], max);
}
if (out_2[pos] < -max) {
buffer_write(out_2[pos], -max);
} else if (out_2[pos] > max) {
buffer_write(out_2[pos], max);
}
#endif
buffer_pos++;
}
plugin_data->buffer_pos = buffer_pos;
plugin_data->peak = peak;
plugin_data->peak_dist = peak_dist;
plugin_data->atten = atten;
*(plugin_data->attenuation) = atten;
*(plugin_data->latency) = delay;
]]>
buffer);
]]>
Limit (dB)
The maximum output amplitude. Peaks over this level will be attenuated as smoothly as possible to bring them as close as possible to this level.
Lookahead delay
The delay used by the lookahead predictor. The longer the delay the smoother the limiting will be, but higher the latency.
Attenuation (dB)
The current attenuation of the signal coming out of the delay buffer.
Input 1
Input 2
Output 1
Output 2
latency