From 8911ddbc575c4714c5ac294dd32bbd9ab4278a2d Mon Sep 17 00:00:00 2001
From: Davide Morelli <morellid@users.sourceforge.net>
Date: Tue, 29 Nov 2005 18:04:09 +0000
Subject: adding shared functions

svn path=/trunk/externals/frankenstein/; revision=4081
---
 common.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++
 common.h | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 144 insertions(+)
 create mode 100755 common.c
 create mode 100755 common.h

diff --git a/common.c b/common.c
new file mode 100755
index 0000000..1eb896f
--- /dev/null
+++ b/common.c
@@ -0,0 +1,63 @@
+
+#include "common.h"
+
+t_duration int2duration(int n)
+{
+	t_duration dur;
+	int curr, i, j, ok;
+	curr=0;
+	ok=0;
+	for (i=0; i<num_possible_denominators; i++)
+	{
+		for (j=0; j<i; j++)
+		{
+			if (curr==n)
+			{
+				dur.numerator=j;
+				dur.denominator=i;
+				j=i;
+				i=num_possible_denominators;
+				ok=1;
+			} else
+				curr++;
+		}
+	}
+	if (ok)
+		return dur;
+	else
+	{
+		dur.numerator=1;
+		dur.denominator=1;
+		return dur;
+	}
+}
+
+unsigned short int duration2int(t_duration dur)
+{
+	unsigned short int curr, i, j;
+	curr=0;
+	for (i=0; i<num_possible_denominators; i++)
+	{
+		for (j=0; j<i; j++)
+		{
+			if ((dur.numerator==j) && (dur.denominator==i))
+			{
+				return curr;
+			} else
+				curr++;
+		}
+	}
+	return curr+1;	
+}
+
+int possible_durations()
+{
+	int ris, i;
+	ris = 0;
+	for (i=0; i<num_possible_denominators; i++)
+	{
+		ris += possible_denominators[i]-1;
+	}
+	ris += 1;
+	return ris;
+}
\ No newline at end of file
diff --git a/common.h b/common.h
new file mode 100755
index 0000000..07b15e1
--- /dev/null
+++ b/common.h
@@ -0,0 +1,81 @@
+// here i put common data structures and functions
+
+// --------- theme notation
+
+// data structures
+
+typedef struct _note
+{
+	unsigned short int played; // 0 if is a rest, 1 if played
+	unsigned short int chord; // 0 if is not a chord (strong) note, 1 if it is
+	unsigned short int diatonic; // 0 if is a note not belonging to this tonality
+	int interval; // semitones from prefious note
+} t_note;
+
+typedef struct _duration
+{
+	int numerator; // like in music notation: in a 1/4 note the numerator is 1
+	int denominator; // like in music notation: in a 1/4 note the denominator is 4
+} t_duration;
+
+typedef struct _note_event
+{
+	unsigned short int voice;
+	t_note note;
+	t_duration duration;
+	struct t_note_event *previous; // this is a list, link to the previous element
+	struct t_note_event *next;  // this is a list, link to the next element
+} t_note_event;
+
+// manipolation functions
+
+// TODO: 
+// - from data structures to lists of numbers and vice versa
+// - from a (voice, rest, duration) representation to (voice, start, duration) and viceversa
+
+// --------- rhythm notation
+
+// data structures
+
+typedef struct _rhythm_event
+{
+	unsigned short int voice;
+	t_duration duration;
+	struct t_rhythm_event *previous; // this is a list, link to the previous element
+	struct t_rhythm_event *next;  // this is a list, link to the next element
+} t_rhythm_event;
+
+// rhythms memory graph
+
+/*
+// list implementation
+// this implements a graph that stores the memory of the current rhythm sub-elements
+// list of links
+typedef struct _rhythm_memory_arc
+{
+	float weight;
+	struct t_rhythm_memory_node *to_node; // the target of this link (arc)
+	struct t_rhythm_memory_arc *next_arc; // next link in the list
+} t_rhythm_memory_arc;
+// graph node
+typedef struct _rhythm_memory_node
+{
+	t_duration duration;
+	struct t_rhythm_memory_arc *arcs; // the list of arcs to other nodes
+} t_rhythm_memory_node;
+*/
+// with a table
+// simpler and most of all non recursive when searching nodes!
+#define num_possible_denominators 11
+unsigned short int possible_denominators[] = {1,2,3,4,6,8,12,16,18,24,32};
+// functions needed to fill and use the memory table
+t_duration int2duration(int n);
+unsigned short int duration2int(t_duration dur);
+int possible_durations();
+
+// manipolation functions
+
+// TODO: 
+// - from data structures to lists of numbers and vice versa
+// - from a (voice, duration) representation to (voice, start, duration) and viceversa
+
-- 
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