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#include "latencyfilter.h"
#include <cmath>
#include <hugin.hpp>
#include "settings.h"
#include "random.h"
LatencyFilter::LatencyFilter(Settings& settings, Random& random)
: settings(settings)
, random(random)
{
}
bool LatencyFilter::filter(event_t& event, std::size_t pos)
{
auto enabled = settings.enable_latency_modifier.load();
auto latency = settings.latency_max.load();
auto samplerate = settings.samplerate.load();
auto latency_laid_back = settings.latency_laid_back.load();
auto latency_stddev = settings.latency_stddev.load();
auto latency_regain = settings.latency_regain.load();
if(!enabled)
{
return true;
}
assert(latency_regain >= 0.0f && latency_regain <= 1.0f);
latency_regain *= -1.0f;
latency_regain += 1.0f;
float duration = (pos - latency_last_pos) / samplerate;
latency_offset *= pow(latency_regain, duration);
latency_last_pos = pos;
float offset_min = latency * -1.0f;
float offset_max = latency * 1.0f;
float mean = 0.0f;
float stddev = latency_stddev / 2.0f;
float offset = random.normalDistribution(mean, stddev);
latency_offset += offset;
if(latency_offset > offset_max) latency_offset = offset_max;
if(latency_offset < offset_min) latency_offset = offset_min;
DEBUG(offset, "latency: %d, offset: %f, drift: %f",
(int)latency, offset, latency_offset);
event.offset += latency;
event.offset += latency_laid_back;
event.offset += latency_offset;
return true;
}
std::size_t LatencyFilter::getLatency() const
{
bool enabled = settings.enable_latency_modifier.load();
std::size_t max_latency = settings.latency_max.load();
if(enabled)
{
return max_latency;
}
return 0u;
}
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