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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* latencyfilter.cc
*
* Fri Jun 10 22:42:53 CEST 2016
* Copyright 2016 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#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;
}
bool LatencyFilter::filter(event_t& event, std::size_t pos)
{
auto enabled = settings.enable_latency_modifier.load();
auto latency_ms = 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;
}
auto latency = getLatencySamples(latency_ms, samplerate);
// Assert latency_regain is within range [0; 1].
assert(latency_regain >= 0.0f && latency_regain <= 1.0f);
// User inputs 0 as no regain and 1 as instant - pow() is the other way around
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;//latency_laid_back;
float stddev = latency_stddev;
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; // fixed latency offset
event.offset += latency_laid_back; // laid back offset (user controlled)
event.offset += latency_offset; // current drift
return true;
}
std::size_t LatencyFilter::getLatency() const
{
bool enabled = settings.enable_latency_modifier.load();
if(enabled)
{
auto latency_ms = settings.latency_max.load();
auto samplerate = settings.samplerate.load();
return getLatencySamples(latency_ms, samplerate);
}
return 0u;
}
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