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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * beatmapper.cc
+ *
+ * Fri Jul 25 11:17:42 CEST 2008
+ * Copyright 2008 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 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 "beatmapper.h"
+
+BeatMapper::BeatMapper(Instrument *instrument)
+{
+ this->instrument = instrument;
+ for(size_t i = 0; i < HISTORY_SIZE; i++) hist[i] = 0.0;
+ C = 1.3;
+ mindist = 2;
+ last = mindist;
+}
+
+
+Sample *BeatMapper::map(jack_nframes_t nframes)
+{
+ Sample *sample = NULL;
+
+ jack_default_audio_sample_t *buffer;
+ buffer = (jack_default_audio_sample_t *)jack_port_get_buffer(instrument->port, nframes);
+
+ float e = 0.0;
+ for(size_t i = 0; i < nframes; i++) {
+ e += buffer[i] * buffer[i];
+ // buffer[i] = 0.0;
+ }
+
+ float E = 0.0;
+ for(size_t i = 0; i < HISTORY_SIZE; i++) E += hist[i] / (float)HISTORY_SIZE;
+
+ printf("last: %d, E: %f, e: %f - threshold: %f\n", last, E, e, 1.3 * E);
+
+ // Shift history and save new value
+ for(size_t i = 0; i < HISTORY_SIZE - 1; i++) hist[i] = hist[i+1];
+ hist[HISTORY_SIZE - 1] = e;
+
+ if(e > C * E && last > mindist) {
+ Velocity *v = instrument->getVelocity(127);
+ if(v) sample = v->getSample();
+ }
+
+ last++;
+ if(sample) last = 0;
+
+ return sample;
+}