stew

commit 60f1065a5f1d9ec64e66e1112d9e4ca6ec6f1a9d
parent 381578e0ded33a6404accc6004b90268f3cfc8ff
Author: rpa <rpa@laika>
Date:   Sat, 21 Jan 2023 22:35:51 +0000

src/midi: a midi library

Diffstat:
A
src/midi/dump.c
 | 
42
++++++++++++++++++++++++++++++++++++++++++
A
src/midi/midi.c
 | 
14
++++++++++++++
A
src/midi/midi.h
 | 
39
+++++++++++++++++++++++++++++++++++++++
A
src/midi/mkfile
 | 
5
+++++

4 files changed, 100 insertions(+), 0 deletions(-)
diff --git a/src/midi/dump.c b/src/midi/dump.c
@@ -0,0 +1,42 @@
+#include <u.h>
+#include <libc.h>
+#include "midi.h"
+
+void
+noteon(MidiMes m)
+{
+	print("ch %d NoteOn %d, vel %d\n", m.channel, m.param[0],
+	  m.param[1]);
+}
+
+void
+noteoff(MidiMes m)
+{
+	print("ch %d NoteOff %d, vel %d\n", m.channel, m.param[0],
+	  m.param[1]);
+}
+
+
+void
+main(void)
+{
+	char buf[256];
+	int i, n;
+	MidiMes m;
+	while ((n = read(0, buf, 256)) > 0) {
+		midifill(&m, buf, 4);
+		switch(m.status) {
+		case NOTE_ON:
+			noteon(m);
+			break;
+		case NOTE_OFF:
+			noteoff(m);
+			break;
+		default:
+			print("%x %x | %x %x | %02x %02x\n",
+			 m.cn, m.cin, m.status, m.channel,
+			 m.param[0], m.param[1]);
+		}
+	}
+	print("%r\n");
+}
diff --git a/src/midi/midi.c b/src/midi/midi.c
@@ -0,0 +1,14 @@
+#include <u.h>
+#include <libc.h>
+#include "midi.h"
+char *
+midifill(MidiMes *m, char *p, int)
+{
+	m->cn = p[0] >> 8;
+	m->cin = p[0] & 0x0f;
+	m->status = p[1] & 0xf0;
+	m->channel = p[1] & 0x0f;
+	m->param[0] = p[2];
+	m->param[1] = p[3];
+	return p + 4;
+}
diff --git a/src/midi/midi.h b/src/midi/midi.h
@@ -0,0 +1,39 @@
+enum {
+	NOTE_OFF = 0x80,
+	NOTE_ON = 0x90,
+	KEY_PRESSURE = 0xa0,
+	CTL_CHANGE = 0xb0,
+	PROG_CHANGE = 0xc0,
+	CHAN_PRESSURE = 0xd0,
+	PITCH_WHEEL = 0xe0,
+	SYS_MESSAGE = 0xf0,
+
+	CIN_Misc = 0x0,
+	CIN_Cable = 0x1,
+	CIN_2Sys = 0x2,
+	CIN_3Sys = 0x3,
+	CIN_SysEx = 0x4,
+	CIN_1Sys = 0x5,
+	CIN_2SysEx = 0x6,
+	CIN_3SysEx = 0x7,
+	CIN_NoteOff = 0x8,
+	CIN_NoteOn = 0x9,
+	CIN_Poly = 0xA,
+	CIN_Ctl = 0xB,
+	CIN_Prog = 0xC,
+	CIN_Press = 0xD,
+	CIN_Bend = 0xE,
+	CIN_Byte = 0xF,
+};
+
+typedef struct MidiMes MidiMes;
+
+struct MidiMes {
+	int cn; /* Cable Number */
+	int cin; /* Code Index Number */
+	int status;
+	int channel;
+	int param[2];
+};
+
+char * midifill(MidiMes *, char *, int);
diff --git a/src/midi/mkfile b/src/midi/mkfile
@@ -0,0 +1,5 @@
+</$objtype/mkfile
+TARG=dump
+HFILES=midi.h
+OFILES=midi.$O
+</sys/src/cmd/mkmany