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Diffstat (limited to 'test/dgreftest/midiinputengine.cc')
| -rw-r--r-- | test/dgreftest/midiinputengine.cc | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/test/dgreftest/midiinputengine.cc b/test/dgreftest/midiinputengine.cc new file mode 100644 index 0000000..bc0fa87 --- /dev/null +++ b/test/dgreftest/midiinputengine.cc @@ -0,0 +1,192 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/*************************************************************************** + * midiinputengine.cc + * + * Sat May 14 13:26:23 CEST 2016 + * Copyright 2016 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 "midiinputengine.h" + +#include <iostream> + +static int const NOTE_ON = 0x90; + +MidifileInputEngine::MidifileInputEngine() + : AudioInputEngineMidi{} + , smf{nullptr} + , current_event{nullptr} + , file{} + , speed{1.f} + , track{-1} // all tracks + , loop{false} + , offset{0.0} + , samplerate{44100.0} // todo: via ctor arg +{ +} + +MidifileInputEngine::~MidifileInputEngine() +{ + if(smf != nullptr) + { + smf_delete(smf); + } +} + +bool MidifileInputEngine::init(const Instruments& instruments) +{ + if(file == "") + { + std::cerr << "[MidifileInputEngine] Missing midi filename\n"; + return false; + } + //if(midimap_filename == "") + //{ + // std::cerr << "[MidifileInputEngine] Missing midimap filename\n"; + // return false; + //} + smf = smf_load(file.c_str()); + if(smf == nullptr) + { + std::cerr << "[MidifileInputEngine] Failed to load midifile '" << file + << "'\n"; + return false; + } + //if(!loadMidiMap(midimap_filename, instruments)) + //{ + // std::cerr << "[MidifileInputEngine] Failed to parse midimap '" + // << midimap_filename << "'\n"; + // return false; + //} + + return true; +} + +void MidifileInputEngine::setParm(const std::string& parm, const std::string& value) +{ + if(parm == "file") + { + // apply midi input filename + file = value; + } + else if(parm == "speed") + { + // try to apply speed + try + { + speed = std::stof(value); + } + catch(...) + { + std::cerr << "[MidifileInputEngine] Invalid speed " << value + << "\n"; + } + } + //else if(parm == "midimap") + //{ + // // apply midimap filename + // midimap_filename = value; + //} + else if(parm == "loop") + { + // apply looping + loop = true; + } + else + { + std::cerr << "[MidifileInputEngine] Unsupported parameter '" << parm + << "'\n"; + } +} + +bool MidifileInputEngine::start() +{ + return true; +} + +void MidifileInputEngine::stop() +{ +} + +void MidifileInputEngine::pre() +{ +} + +void MidifileInputEngine::run(size_t pos, size_t len, std::vector<event_t>& events) +{ + assert(events.empty()); + + double current_max_time = (1.0 + pos + len) / (samplerate / speed); + current_max_time -= offset; + + if(!current_event) + { + current_event = smf_get_next_event(smf); + } + + while(current_event && current_event->time_seconds < current_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) + { + int key = current_event->midi_buffer[1]; + int velocity = current_event->midi_buffer[2]; + + events.emplace_back(); + auto& event = events.back(); + event.type = TYPE_ONSET; + size_t evpos = current_event->time_seconds * (samplerate / speed); + event.offset = evpos - pos; + + int i = mmap.lookup(key); + if(i != -1) + { + event.instrument = i; + event.velocity = velocity / 127.0; + } + } + } + + current_event = smf_get_next_event(smf); + } + + if(!current_event) + { + if(loop) + { + smf_rewind(smf); + offset += current_max_time; + } + else + { + assert(len >= 1); + events.push_back({TYPE_STOP, 0, len-1, 0.f}); + } + } +} + +void MidifileInputEngine::post() +{ +} |