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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)
{
}
template<typename T1, typename T2>
static T1 getLatencySamples(T1 latency_ms, T2 samplerate)
{
return latency_ms * samplerate / 1000.;
}
template<typename T1, typename T2>
static T1 getLatencyMs(T1 latency_samples, T2 samplerate)
{
return 1000. * latency_samples / samplerate;
}
bool LatencyFilter::filter(event_t& event, std::size_t pos)
{
auto enabled = settings.enable_latency_modifier.load();
auto latency_ms = settings.latency_max_ms.load();
auto samplerate = settings.samplerate.load();
auto latency_laid_back_ms = settings.latency_laid_back_ms.load();
auto latency_stddev = settings.latency_stddev.load();
auto latency_regain = settings.latency_regain.load();
if(!enabled)
{
return true;
}
auto latency = getLatencySamples(latency_ms, samplerate);
auto latency_laid_back = getLatencySamples(latency_laid_back_ms, samplerate);
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;
float offset_max = latency;
float offset_ms = random.normalDistribution(0.0f, latency_stddev);
latency_offset += getLatencySamples(offset_ms, samplerate);
latency_offset = std::max(offset_min, std::min(offset_max, latency_offset));
DEBUG(offset, "latency: %d, offset: %f, drift: %f",
(int)latency, offset_ms, latency_offset);
event.offset += latency;
event.offset += latency_laid_back;
event.offset += latency_offset;
auto latency_current_ms = getLatencyMs(latency_offset + latency_laid_back, samplerate);
settings.latency_current.store(latency_current_ms);
return true;
}
std::size_t LatencyFilter::getLatency() const
{
bool enabled = settings.enable_latency_modifier.load();
if(enabled)
{
auto latency_ms = settings.latency_max_ms.load();
auto samplerate = settings.samplerate.load();
return getLatencySamples(latency_ms, samplerate);
}
return 0u;
}
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