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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* inputprocessor.cc
*
* Sat Apr 23 20:39:30 CEST 2016
* Copyright 2016 André Nusser
* andre.nusser@googlemail.com
****************************************************************************/
/*
* 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 "inputprocessor.h"
#include <list>
#include "hugin.hpp"
#include "instrument.h"
#include "staminafilter.h"
#include "latencyfilter.h"
#include "cpp11fix.h"
InputProcessor::InputProcessor(Settings& settings,
DrumKit& kit,
std::list<Event*>* activeevents,
Random& random)
: kit(kit)
, activeevents(activeevents)
, is_stopping(false)
, settings(settings)
{
// Build filter list
filters.emplace_back(std::make_unique<StaminaFilter>(settings));
filters.emplace_back(std::make_unique<LatencyFilter>(settings, random));
}
bool InputProcessor::process(std::vector<event_t>& events,
std::size_t pos,
double resample_ratio)
{
for(auto& event: events)
{
if(event.type == TYPE_ONSET)
{
if(!processOnset(event, pos, resample_ratio))
{
continue;
}
}
if(!processStop(event))
{
return false;
}
}
return true;
}
std::size_t InputProcessor::getLatency() const
{
std::size_t latency = 0;
for(const auto& filter : filters)
{
latency += filter->getLatency();
}
return latency;
}
bool InputProcessor::processOnset(event_t& event,
std::size_t pos,
double resample_ratio)
{
if(!kit.isValid())
{
return false;
}
std::size_t ev_instr = event.instrument;
Instrument* instr = nullptr;
if(ev_instr < kit.instruments.size())
{
instr = kit.instruments[ev_instr].get();
}
if(instr == nullptr || !instr->isValid())
{
ERR(inputprocessor, "Missing Instrument %d.\n", (int)ev_instr);
return false;
}
if(instr->getGroup() != "")
{
// Add event to ramp down all existing events with the same groupname.
for(Channel& ch: kit.channels)
{
for(Event* event: activeevents[ch.num])
{
if(event->getType() == Event::sample)
{
auto& event_sample = *static_cast<EventSample*>(event);
if(event_sample.group == instr->getGroup() &&
event_sample.instrument != instr)
{
// Ramp down 14.7ms (3000 samples in 44k1Hz)
event_sample.rampdown = settings.samplerate.load() / 14.7;
// TODO: This must be configurable at some point...
// ... perhaps even by instrument (ie. in the xml file)
event_sample.ramp_start = event_sample.rampdown;
}
}
}
}
}
for(auto& filter : filters)
{
// This line might change the 'event' variable
bool keep = filter->filter(event, event.offset + pos);
if(!keep)
{
return false; // Skip event completely
}
}
Sample* sample = instr->sample(event.velocity, event.offset + pos);
if(sample == nullptr)
{
ERR(inputprocessor, "Missing Sample.\n");
return false;
}
for(Channel& ch: kit.channels)
{
AudioFile* af = sample->getAudioFile(ch);
if(af == nullptr || !af->isValid())
{
//DEBUG(inputprocessor, "Missing AudioFile.\n");
}
else
{
//DEBUG(inputprocessor, "Adding event %d.\n", event.offset);
Event* evt = new EventSample(ch.num, 1.0, af, instr->getGroup(), instr);
evt->offset = (event.offset + pos) * resample_ratio;
activeevents[ch.num].push_back(evt);
}
}
return true;
}
bool InputProcessor::processStop(event_t& event)
{
if(event.type == TYPE_STOP)
{
is_stopping = true;
}
if(is_stopping)
{
// Count the number of active events.
int num_active_events = 0;
for(auto& ch: kit.channels)
{
num_active_events += activeevents[ch.num].size();
}
if(num_active_events == 0)
{
// No more active events - now we can stop the engine.
return false;
}
}
return true;
}
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