[incomplete] added MidifileInputEngine and WavfileOutputEngine

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() {
+}