Diff: Synth.cpp

Revision:

0:ce6724069f0a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Synth.cpp	Wed Jan 09 22:46:12 2013 +0000
@@ -0,0 +1,105 @@
+/* 
+ * libmbed-synth An audio synthesis library capable of running
+ * alongside other activities. 
+ * Copyright (C) <2009> Michael Sheldon <mike@mikeasoft.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+*/
+ 
+#include "Synth.h"
+ 
+Synth::Synth(PinName aout) :
+        _aout(aout) {
+    _repeat = false;
+    _samplerate = 22000;
+    _samples = NULL;
+    _sample_size = 0;
+    _position = 0;
+    _bpm = 120;
+    _notes = NULL;
+    _num_notes = 0;
+}
+
+void Synth::play() {
+    _ticker.attach(this, &Synth::_proc_sample, 1.0 / _samplerate);
+    
+    DigitalOut l(LED1);
+    l = 1;
+}
+
+void Synth::pause() {
+    _ticker.detach();
+}
+
+void Synth::stop() {
+    _position = 0;
+    _ticker.detach();
+}
+
+void Synth::set_repeat(bool repeat) {
+    _repeat = repeat;
+}
+
+void Synth::set_instrument(PluckedGuitar *instrument){
+    _instrument = instrument;
+    _instrument->set_bpm(_bpm);
+    _instrument->set_samplerate(_samplerate);
+}
+
+void Synth::set_bpm(int bpm) {
+    _bpm = bpm;
+    if(_instrument != NULL) {
+        _instrument->set_bpm(_bpm);
+    }
+}
+
+void Synth::_proc_sample() {
+    if (_position == 0) {
+        _instrument->note(_notes[_position]);
+        _position++;
+    }
+    
+    float sample = _instrument->proc_sample();
+    
+    if (sample == -1) {
+        _instrument->note(_notes[_position]);
+        _position++;
+    } else {
+        _aout = sample;
+    } 
+    
+    if (sample == -1 && _position > _num_notes) {
+        if(_repeat) {
+            _position = 0;
+        } else {
+            stop();
+        }
+    }
+}
+
+void Synth::add_note(float frequency, float duration) {
+    _num_notes++;
+    Note n;
+    n.frequency = frequency;
+    n.duration = duration;
+    if (_notes == NULL) {
+        _notes = (Note*) malloc(sizeof(Note));
+    } else {
+        _notes = (Note*) realloc(_notes, sizeof(Note) * _num_notes);
+        
+    }
+    _notes[_num_notes - 1] = n;
+}
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