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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 Andr� 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 "latencyfilter.h"
#include "powermapfilter.h"
#include "staminafilter.h"
#include "velocityfilter.h"
#include "cpp11fix.h"
class VelocityStorer
: public InputFilter
{
public:
VelocityStorer(float& original_velocity)
: original_velocity(original_velocity)
{
}
bool filter(event_t& event, std::size_t pos) override
{
original_velocity = event.velocity;
return true;
}
private:
float& original_velocity;
};
class Reporter
: public InputFilter
{
public:
Reporter(Settings& settings, float& original_velocity)
: settings(settings)
, original_velocity(original_velocity)
{
}
bool filter(event_t& event, std::size_t pos) override
{
settings.velocity_modifier_current.store(event.velocity / original_velocity);
return true;
}
private:
Settings& settings;
float& original_velocity;
};
InputProcessor::InputProcessor(Settings& settings,
DrumKit& kit,
EventsDS& events_ds,
Random& random)
: kit(kit)
, events_ds(events_ds)
, settings(settings)
{
// Build filter list
filters.emplace_back(std::make_unique<PowermapFilter>(settings));
filters.emplace_back(std::make_unique<VelocityStorer>(original_velocity));
filters.emplace_back(std::make_unique<StaminaFilter>(settings));
filters.emplace_back(std::make_unique<LatencyFilter>(settings, random));
filters.emplace_back(std::make_unique<VelocityFilter>(settings, random));
filters.emplace_back(std::make_unique<Reporter>(settings, original_velocity));
}
bool InputProcessor::process(std::vector<event_t>& events,
std::size_t pos,
double resample_ratio)
{
for(auto& event: events)
{
if(event.type == EventType::OnSet)
{
if(!processOnset(event, pos, resample_ratio))
{
continue;
}
}
if(event.type == EventType::Choke)
{
if(!processChoke(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;
}
void InputProcessor::applyChoke(Settings& settings, SampleEvent& event,
double length_ms, timepos_t offset, std::size_t pos)
{
std::size_t ramp_length = (length_ms / 1000.) * settings.samplerate.load();
event.rampdown_count = ramp_length;
event.rampdown_offset = offset + pos;
event.ramp_length = ramp_length;
}
void InputProcessor::applyChokeGroup(Settings& settings, DrumKit& kit,
Instrument& instr, event_t& event,
EventsDS& events_ds, std::size_t pos)
{
std::size_t instrument_id = event.instrument;
if(instr.getGroup() == "")
{
return;
}
// Add event to ramp down all existing events with the same groupname.
for(const auto& ch : kit.channels)
{
if(ch.num >= NUM_CHANNELS) // kit may have more channels than the engine
{
continue;
}
for(auto& event_sample : events_ds.iterateOver<SampleEvent>(ch.num))
{
if(event_sample.group == instr.getGroup() &&
event_sample.instrument_id != instrument_id &&
event_sample.rampdown_count == -1) // Only if not already ramping.
{
// Fixed group rampdown time of 68ms, independent of samplerate
applyChoke(settings, event_sample, 68, event.offset, pos);
}
}
}
}
void InputProcessor::applyDirectedChoke(Settings& settings, DrumKit& kit,
Instrument& instr, event_t& event,
EventsDS& events_ds, std::size_t pos)
{
for(const auto& choke : instr.getChokes())
{
// Add event to ramp down all existing events with the same groupname.
for(const auto& ch : kit.channels)
{
if(ch.num >= NUM_CHANNELS) // kit may have more channels than the engine
{
continue;
}
for(auto& event_sample : events_ds.iterateOver<SampleEvent>(ch.num))
{
if(choke.instrument_id == event_sample.instrument_id &&
event_sample.rampdown_count == -1) // Only if not already ramping.
{
// choke.choketime is in ms
applyChoke(settings, event_sample, choke.choketime, event.offset, pos);
}
}
}
}
}
bool InputProcessor::processOnset(event_t& event, std::size_t pos,
double resample_ratio)
{
if(!kit.isValid())
{
return false;
}
// In case log-power and dynamic expander is used, apply a special velocity curve
if(settings.drumkit_is_log_power)
{
auto a = 0.981; // compatible to Roland sound modules
event.velocity = (126.0f / (pow(a, 126.0f) - 1.0f) * (pow(a, event.velocity * 127.0f - 1.0f) - 1.0f) + 1.0f) / 127.0f;
}
std::size_t instrument_id = event.instrument;
Instrument* instr = nullptr;
if(instrument_id < kit.instruments.size())
{
instr = kit.instruments[instrument_id].get();
}
if(instr == nullptr || !instr->isValid())
{
ERR(inputprocessor, "Missing Instrument %d.\n", (int)instrument_id);
return false;
}
original_velocity = event.velocity;
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
}
}
// Mute other instruments in the same instrument/choke group
applyChokeGroup(settings, kit, *instr, event, events_ds, pos);
// Apply directed chokes to mute other instruments if needed
applyDirectedChoke(settings, kit, *instr, event, events_ds, pos);
auto const power_max = instr->getMaxPower();
auto const power_min = instr->getMinPower();
float const power_span = power_max - power_min;
float const instrument_level = power_min + event.velocity*power_span;
const auto sample = instr->sample(instrument_level, event.offset + pos);
if(sample == nullptr)
{
ERR(inputprocessor, "Missing Sample.\n");
return false;
}
if(settings.enable_voice_limit.load())
{
limitVoices(instrument_id,
settings.voice_limit_max.load(),
settings.voice_limit_rampdown.load(), pos);
}
//Given that audio files could be invalid, maybe we must add the new
//group just before adding the first new sample...
bool new_group_added = false;
for(Channel& ch: kit.channels)
{
if(ch.num >= NUM_CHANNELS) // kit may have more channels than the engine
{
continue;
}
const auto af = sample->getAudioFile(ch);
if(af == nullptr || !af->isValid())
{
//DEBUG(inputprocessor, "Missing AudioFile.\n");
}
else
{
//DEBUG(inputprocessor, "Adding event %d.\n", event.offset);
if(!new_group_added)
{
new_group_added=true;
events_ds.startAddingNewGroup(instrument_id);
}
auto& event_sample =
events_ds.emplace<SampleEvent>(ch.num, ch.num, 1.0, af,
instr->getGroup(), instrument_id);
event_sample.offset = (event.offset + pos) * resample_ratio;
if(settings.normalized_samples.load() && sample->getNormalized())
{
event_sample.scale *= event.velocity;
}
// Dynamic expander (only enabled if log-power is configured)
if(settings.drumkit_is_log_power)
{
auto target_dynamic_db = 50.0; // dB, defined maximum dynamic after expander
event_sample.scale = pow(10.0, (event.velocity * target_dynamic_db + instr->getMaxPower() - target_dynamic_db - sample->getPower()) / 20);
}
}
}
return true;
}
bool InputProcessor::processChoke(event_t& event,
std::size_t pos,
double resample_ratio)
{
if(!kit.isValid())
{
return false;
}
std::size_t instrument_id = event.instrument;
Instrument* instr = nullptr;
if(instrument_id < kit.instruments.size())
{
instr = kit.instruments[instrument_id].get();
}
if(instr == nullptr || !instr->isValid())
{
ERR(inputprocessor, "Missing Instrument %d.\n", (int)instrument_id);
return false;
}
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
}
}
// Add event to ramp down all existing events with the same groupname.
for(const auto& ch : kit.channels)
{
if(ch.num >= NUM_CHANNELS) // kit may have more channels than the engine
{
continue;
}
for(auto& event_sample : events_ds.iterateOver<SampleEvent>(ch.num))
{
if(event_sample.instrument_id == instrument_id &&
event_sample.rampdown_count == -1) // Only if not already ramping.
{
// Fixed group rampdown time of 68ms, independent of samplerate
applyChoke(settings, event_sample, 450, event.offset, pos);
}
}
}
return true;
}
bool InputProcessor::processStop(event_t& event)
{
if(event.type == EventType::Stop)
{
is_stopping = true;
}
if(is_stopping)
{
// Count the number of active events.
int num_active_events = 0;
for(auto& ch: kit.channels)
{
if(ch.num >= NUM_CHANNELS) // kit may have more channels than the engine
{
continue;
}
num_active_events += events_ds.numberOfEvents(ch.num);
}
if(num_active_events == 0)
{
// No more active events - now we can stop the engine.
return false;
}
}
return true;
}
void InputProcessor::limitVoices(std::size_t instrument_id,
std::size_t max_voices,
float rampdown_time, std::size_t pos)
{
const auto& group_ids=events_ds.getSampleEventGroupIDsOf(instrument_id);
if(group_ids.size() <= max_voices)
{
return;
}
//Filter out ramping events...
auto filter_ramping_predicate =
[this](EventGroupID group_id) -> bool
{
const auto& event_ids=events_ds.getEventIDsOf(group_id);
//TODO: This should not happen.
if(!event_ids.size())
{
return false;
}
const auto& sample=events_ds.get<SampleEvent>(event_ids[0]);
return !sample.hasRampdown();
};
EventGroupIDs non_ramping;
std::copy_if(std::begin(group_ids),
std::end(group_ids),
std::back_inserter(non_ramping), filter_ramping_predicate);
if(!non_ramping.size())
{
return;
}
//Let us get the eldest...
auto compare_event_offsets =
[this](EventGroupID a, EventGroupID b)
{
const auto& event_ids_a=events_ds.getEventIDsOf(a);
const auto& event_ids_b=events_ds.getEventIDsOf(b);
const auto& sample_a=events_ds.get<SampleEvent>(event_ids_a[0]);
const auto& sample_b=events_ds.get<SampleEvent>(event_ids_b[0]);
return sample_a.offset < sample_b.offset;
};
auto it = std::min_element(std::begin(non_ramping),
std::end(non_ramping),
compare_event_offsets);
if(it == std::end(non_ramping))
{
return;
}
const auto& event_ids = events_ds.getEventIDsOf(*it);
for(const auto& event_id : event_ids)
{
auto& sample=events_ds.get<SampleEvent>(event_id);
applyChoke(settings, sample, rampdown_time, sample.offset, pos);
}
}
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