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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 "midimapparser.h"
#include "drumgizmo.h"
#include <hugin.hpp>
AudioInputEngineMidi::AudioInputEngineMidi()
: refs(REFSFILE)
{
is_valid = false;
}
bool AudioInputEngineMidi::loadMidiMap(const std::string& file,
const Instruments& instruments)
{
std::string f = file;
if(refs.load())
{
if(file.size() > 1 && file[0] == '@')
{
f = refs.getValue(file.substr(1));
}
}
else
{
ERR(drumkitparser, "Error reading refs.conf");
}
midimap = "";
is_valid = false;
DEBUG(mmap, "loadMidiMap(%s, i.size() == %d)\n", f.c_str(),
(int)instruments.size());
if(f == "")
{
return false;
}
MidiMapParser midimap_parser;
if(!midimap_parser.parseFile(f))
{
return false;
}
instrmap_t instrmap;
for(size_t i = 0; i < instruments.size(); i++)
{
instrmap[instruments[i]->getName()] = i;
}
mmap.swap(instrmap, midimap_parser.midimap);
midimap = file;
is_valid = true;
return true;
}
std::string AudioInputEngineMidi::getMidimapFile() const
{
return midimap;
}
bool AudioInputEngineMidi::isValid() const
{
return is_valid;
}
// Note types:
static const std::uint8_t NoteOff = 0x80;
static const std::uint8_t NoteOn = 0x90;
static const std::uint8_t NoteAftertouch = 0xA0;
static const std::uint8_t ControlChange = 0xB0;
// Note type mask:
static const std::uint8_t TypeMask = 0xF0;
// See:
// https://www.midi.org/specifications-old/item/table-1-summary-of-midi-message
// TODO better implementation: use member variable for controller value, set MIDI key on command line
int hihat_controller = 0; // open hi-hat
int hihat_midi_key = 26;
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(midi_buffer_length < 3)
{
return;
}
const bool use_edrumulus_debugging_output = false;
if(use_edrumulus_debugging_output)
{
auto type = midi_buffer[0] & TypeMask;
auto key = midi_buffer[1];
auto velocity = midi_buffer[2];
if((type == ControlChange) && (key == 16))
{
std::string bar = "--------------------";
bar[static_cast<int>(static_cast<float>(velocity) / 128 * 20)] = '*';
printf(std::string(" " + bar + "\n").c_str());
}
else
{
printf("key: %d, velocity: %d\n", key, velocity);
}
}
switch(midi_buffer[0] & TypeMask)
{
case NoteOff:
// Ignore for now
break;
case NoteOn:
{
auto key = midi_buffer[1];
auto velocity = midi_buffer[2];
auto instrument_idx = mmap.lookup(key);
if(velocity != 0 && instrument_idx != -1)
{
// maps velocities to [.5/127, 126.5/127]
auto centered_velocity = (velocity-.5f)/127.0f;
events.push_back({ EventType::OnSet, (std::size_t)instrument_idx,
offset, centered_velocity, positional_information });
// quick hack, add 1000000 to offset to transport hi-hat controller value
auto instrument_idx1 = mmap.lookup(hihat_midi_key);
if(instrument_idx == instrument_idx1)
{
if(hihat_controller < 100) // quick hack: hard-coded value
{
events.push_back({ EventType::Choke, (std::size_t)instrument_idx,
1000000 + hihat_controller, .0f, .0f });
}
}
}
}
break;
case NoteAftertouch:
{
auto key = midi_buffer[1];
auto velocity = midi_buffer[2];
auto instrument_idx = mmap.lookup(key);
if(velocity > 0 && instrument_idx != -1)
{
events.push_back({ EventType::Choke, (std::size_t)instrument_idx,
offset, .0f, .0f });
}
}
break;
case ControlChange:
{
auto controller_number = midi_buffer[1];
auto value = midi_buffer[2];
if(controller_number == 16) // positional information
{
// Store value for use in next NoteOn event.
positional_information = value / 127.0f;
// Return here to prevent reset of cached positional information.
return;
}
if(controller_number == 4) // hi-hat pedal
{
// quick hack: if hi-hat control pedal is down, choke hi-hat instrument
auto instrument_idx = mmap.lookup(hihat_midi_key);
hihat_controller = value;
if(value > 100 && instrument_idx != -1) // quick hack: hard-coded value
{
events.push_back({ EventType::Choke, (std::size_t)instrument_idx,
offset, .0f, .0f });
}
}
}
break;
default:
break;
}
// Clear cached positional information.
positional_information = 0.0f;
}
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