From a0a16d9cdb9d0522053c2e830b7440e9e96231a9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20Gl=C3=B6ckner?= <cgloeckner@freenet.de>
Date: Wed, 20 Jan 2016 17:46:50 +0100
Subject: [incomplete] added MidifileInputEngine and WavfileOutputEngine
---
drumgizmo/input/midifile.cc | 160 ++++++++++++++++++++++++++++++++++++++++++++
drumgizmo/input/midifile.h | 66 ++++++++++++++++++
2 files changed, 226 insertions(+)
create mode 100644 drumgizmo/input/midifile.cc
create mode 100644 drumgizmo/input/midifile.h
(limited to 'drumgizmo/input')
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 Gl�ckner
+ * 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() {
+}
diff --git a/drumgizmo/input/midifile.h b/drumgizmo/input/midifile.h
new file mode 100644
index 0000000..c2fcdb6
--- /dev/null
+++ b/drumgizmo/input/midifile.h
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * minifile.h
+ *
+ * Mi 20. Jan 16:07:57 CET 2016
+ * Copyright 2016 Christian Gl�ckner
+ * 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.
+ */
+#pragma once
+#include <string>
+
+#include <event.h>
+#include <smf.h>
+
+#include <audioinputengine.h>
+#include <midimapper.h>
+#include <midimapparser.h>
+
+#define NOTE_ON 0x90
+
+class MidifileInputEngine
+ : public AudioInputEngine {
+ public:
+ MidifileInputEngine();
+ ~MidifileInputEngine();
+
+ // based on AudioInputEngine
+ bool isMidiEngine() override;
+ bool init(Instruments &instruments) override;
+ void setParm(std::string parm, std::string value) override;
+ bool start() override;
+ void stop() override;
+ void pre() override;
+ event_t* run(size_t pos, size_t len, size_t* nevents) override;
+ void post() override;
+
+ private:
+ smf_t* smf;
+ smf_event_t* current_event;
+
+ MidiMapper midiMapper;
+
+ std::string file, midimap;
+ float speed;
+ int track;
+ bool loop;
+ double offset;
+};
--
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