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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* midifile.cc
*
* Mi 20. Jan 16:07:57 CET 2016
* Copyright 2016 Christian Glöckner
* cgloeckner@freenet.de
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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 "midifile.h"
int const NOTE_ON = 0x90;
MidifileInputEngine::MidifileInputEngine()
: smf{nullptr}
, current_event{nullptr}
, file{}
, midimap{}
, speed{1.f}
, track{-1} // all tracks
, loop{false}
, offset{0.0} {
}
MidifileInputEngine::~MidifileInputEngine() {
if (smf != nullptr) {
smf_delete(smf);
}
}
bool MidifileInputEngine::isMidiEngine() {
}
bool MidifileInputEngine::init(Instruments& instruments) {
if (file == "") {
fprintf(stderr, "Missing midifile argument 'file'\n");
return false;
}
if (midimap == "") {
fprintf(stderr, "Missing midimapfile argument 'midimap'.\n");
return false;
}
smf = smf_load(file.c_str());
if (sfml == nullptr) {
fprintf(stderr, "Could not open midifile '%s'.\n", filename.c_str());
return false;
}
MidiMapParser p{midimap};
if (p.parse()) {
fprintf(stderr, "Could not parse midimapfile '%s'.\n", midimapfile.c_str());
return false;
}
midiMapper.midimap = std::move(p.midimap);
for (auto i = 0u; i < instruments.size(); ++i) {
auto name = instruments[0]->name;
midiMapper.instrmap[name] = i;
}
return true;
}
void MidifileInputEngine::setParm(std::string parm, std::string value) {
if(parm == "file") {
filen = value;
} else if(parm == "speed") {
speed = std::stof(value);
} else if (parm == "midimap") {
midimap = value;
} else if (parm == "loop") {
loop = true;
} else {
printf("Unsupported midifile parameter '%s'\n", parm);
}
}
bool MidifileInputEngine::start() {
return true;
}
void MidifileInputEngine::stop() {
}
void MidifileInputEngine::pre() {
}
event_t* MidifileInputEngine::run(size_t pos, size_t len, size_t *nevents) {
event_t* evs{nullptr};
std::size_t nevs{0u};
double current_max_time = 1.0 * (pos + len) / (44100.0 / speed);
current_max_time -= offset;
if (current_event == nullptr) {
current_event = smf_get_next_event(smf);
}
while(current_event && current_event->time_seconds < cur_max_time) {
if(!smf_event_is_metadata(current_event)) {
if((current_event->midi_buffer_length == 3) &&
((current_event->midi_buffer[0] & NOTE_ON) == NOTE_ON) &&
(track == -1 || current_event->track_number == track) &&
current_event->midi_buffer[2] > 0) {
if(evs == NULL) {
evs = (event_t *)malloc(sizeof(event_t) * 1000);
}
int key = current_event->midi_buffer[1];
int velocity = current_event->midi_buffer[2];
evs[nevs].type = TYPE_ONSET;
size_t evpos = current_event->time_seconds * (44100.0 / speed);
evs[nevs].offset = evpos - pos;
int i = midiMap.lookup(key);
if(i != -1) {
evs[nevs].instrument = i;
evs[nevs].velocity = velocity / 127.0;
nevs++;
if(nevs > 999) {
fprintf(stderr, "PANIC!\n");
break;
}
}
}
}
current_event = smf_get_next_event(smf);
}
if(!current_event) {
if(loop) {
smf_rewind(smf);
offset += cur_max_time;
} else {
if(evs == NULL) {
evs = (event_t *)malloc(sizeof(event_t) * 1000);
}
evs[nevs].type = TYPE_STOP;
evs[nevs].offset = len - 1;
nevs++;
}
}
*nevents = nevs;
return evs;
}
void MidifileInputEngine::post() {
}
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