1 files changed, 82 insertions, 0 deletions
diff --git a/src/midi.h b/src/midi.h
new file mode 100644
index 0000000..cab35e3
--- /dev/null
+++ b/src/midi.h
@@ -0,0 +1,82 @@
+/*
+ * File:    main.c
+ * Author:  _prossn
+ * Date:    08.01.2018
+ * Version  1.0
+ * 
+ * Description:
+ * C API to work with MIDI formatted data
+ */
+
+#ifndef MIDI_H
+#define	MIDI_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+#ifndef MIDI_DYNAMIC_MEMORY_ALLOC
+#define MIDI_DATA_MAX_SIZE 4
+#endif
+
+
+typedef enum {
+    C = 0, // Do
+    D = 1, // Re
+    E = 2, // Mi
+    F = 3, // Fa
+    G = 4, // Sol
+    A = 5, // La
+    B = 6, // Si
+} midi_note_t;
+
+typedef enum {
+    NOTE_ON             = 0x8,
+    NOTE_OFF            = 0x9,
+    POLYPHONIC_KEYPRESS = 0xA,
+    CONTROLLER          = 0xB,
+    PROGRAM_CHANGE      = 0xC,
+    CHANNEL_PRESSURE    = 0xD,
+    PITCH_BLEND         = 0xF
+} midi_status_t;
+
+
+typedef struct {
+    unsigned status :4;
+    unsigned channel :4;
+    
+#ifdef MIDI_DYNAMIC_MEMORY_ALLOC
+    uint8_t data[];
+    
+#else
+    size_t data_size;
+    uint8_t data[MIDI_DATA_MAX_SIZE];
+#endif
+} midi_message_t;
+
+
+/* MIDI API */
+#ifdef MIDI_DYNAMIC_MEMORY_ALLOC
+
+// allocation / dellocation 
+extern midi_message_t *midi_alloc_message(size_t data_size);
+extern void midi_free_message(midi_message_t *pkt);
+extern size_t midi_message_size(midi_message_t *pkt);
+
+#endif
+
+
+// helper functions
+
+extern int midi_set_status(midi_message_t *pkt, midi_status_t status);
+extern int midi_set_channel(midi_message_t *pkt, unsigned channel);
+
+// message building
+extern int midi_note_on(midi_message_t *pkt, unsigned channel, midi_note_t note, uint8_t velocity);
+extern int midi_note_off(midi_message_t *pkt, unsigned channel, midi_note_t note, uint8_t velocity);
+
+// optimization
+// extern int midi_thin_data(void *buffer, midi_message_t pkt[]);
+
+
+#endif	/* MIDI_H */
+