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Diffstat (limited to 'drumgizmo/input/midifile.cc')
| -rw-r--r-- | drumgizmo/input/midifile.cc | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/drumgizmo/input/midifile.cc b/drumgizmo/input/midifile.cc new file mode 100644 index 0000000..b0685ec --- /dev/null +++ b/drumgizmo/input/midifile.cc @@ -0,0 +1,160 @@ +/* -*- 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() { +} |