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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* audioinputenginemidi.cc
*
* Mon Apr 1 20:13:25 CEST 2013
* Copyright 2013 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 "audioinputenginemidi.h"
#include "instrument.h"
#include "midimapparser.h"
#include <cassert>
#include <hugin.hpp>
bool AudioInputEngineMidi::loadMidiMap(const std::string& midimap_file,
const Instruments& instruments)
{
std::string file = midimap_file;
if(refs.load())
{
if(file.size() > 1 && file[0] == '@')
{
file = refs.getValue(file.substr(1));
}
}
else
{
ERR(drumkitparser, "Error reading refs.conf");
}
midimap = "";
is_valid = false;
DEBUG(mmap, "loadMidiMap(%s, i.size() == %d)\n", file.c_str(),
(int)instruments.size());
if(file.empty())
{
return false;
}
MidiMapParser midimap_parser;
if(!midimap_parser.parseFile(file))
{
return false;
}
instrmap_t instrmap;
for(size_t i = 0; i < instruments.size(); i++)
{
instrmap[instruments[i]->getName()] = static_cast<int>(i);
}
mmap.swap(instrmap, midimap_parser.midimap);
midimap = file;
reloaded = true;
is_valid = true;
return true;
}
std::string AudioInputEngineMidi::getMidimapFile() const
{
return midimap;
}
bool AudioInputEngineMidi::isValid() const
{
return is_valid;
}
// Note types:
constexpr std::uint8_t NoteOff{0x80};
constexpr std::uint8_t NoteOn{0x90};
constexpr std::uint8_t NoteAftertouch{0xA0};
constexpr std::uint8_t ControlChange{0xB0};
// Note type mask:
constexpr std::uint8_t NoteMask{0xF0};
void AudioInputEngineMidi::processNote(const std::uint8_t* midi_buffer,
std::size_t midi_buffer_length,
std::size_t offset,
std::vector<event_t>& events)
{
if(reloaded)
{
events.push_back({EventType::ResetInstrumentStates, 0, 0, InstrumentStateKind::NoneOrAny, 0.0f});
reloaded = false;
}
if(midi_buffer_length < 3)
{
return;
}
switch(midi_buffer[0] & NoteMask) // NOLINT - span
{
case NoteOff:
// Ignore for now
break;
case NoteOn:
{
auto key = midi_buffer[1]; // NOLINT - span
auto velocity = midi_buffer[2]; // NOLINT - span
auto map_entries = mmap.lookup(key, MapFrom::Note, MapTo::PlayInstrument);
for(const auto& entry : map_entries)
{
auto instrument_idx = mmap.lookup_instrument(entry.instrument_name);
if(instrument_idx >= 0 && velocity != 0)
{
constexpr float lower_offset{0.5f};
constexpr float midi_velocity_max{127.0f};
// maps velocities to [.5/127, 126.5/127]
assert(velocity <= 127); // MIDI only support up to 127
auto centered_velocity =
(static_cast<float>(velocity) - lower_offset) / midi_velocity_max;
events.push_back({EventType::OnSet, (std::size_t)instrument_idx,
offset, InstrumentStateKind::NoneOrAny, centered_velocity});
}
}
}
break;
case NoteAftertouch:
{
auto key = midi_buffer[1]; // NOLINT - span
auto velocity = midi_buffer[2]; // NOLINT - span
auto map_entries = mmap.lookup(key, MapFrom::Note, MapTo::PlayInstrument);
for(const auto& entry : map_entries)
{
auto instrument_idx = mmap.lookup_instrument(entry.instrument_name);
if(instrument_idx >= 0 && velocity > 0)
{
events.push_back({EventType::Choke, (std::size_t)instrument_idx,
offset, InstrumentStateKind::NoneOrAny, .0f});
}
}
}
break;
case ControlChange:
{
auto controller_number = midi_buffer[1]; // NOLINT - span
auto value = midi_buffer[2]; // NOLINT - span
auto map_entries = mmap.lookup(controller_number,
MapFrom::CC,
MapTo::InstrumentState);
for(const auto& entry : map_entries)
{
auto instrument_idx = mmap.lookup_instrument(entry.instrument_name);
if (instrument_idx >= 0) {
constexpr float lower_offset{0.5f};
constexpr float cc_value_max{127.0f};
auto centered_value =
(static_cast<float>(value) - lower_offset) / cc_value_max;
events.push_back({EventType::ChangeInstrumentState,
(std::size_t)instrument_idx, 0,
entry.maybe_instrument_state_kind,
centered_value});
}
}
}
}
}
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