shithub: patch

ref: 25c260fde5a5ee9ca01bd805e88e89f0f508f803
dir: /midi-debug/

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diff -r 02682c97b28d sys/src/games/midi.c
--- a/sys/src/games/midi.c	Fri Sep 29 21:19:12 2017 +0200
+++ b/sys/src/games/midi.c	Sat Sep 30 14:21:21 2017 +0200
@@ -13,11 +13,13 @@
 
 typedef struct Tracker Tracker;
 
-int fd, ofd, div, tempo = 500000, ntrack;
+int fd, ofd, div, tempo = 500000, ntrack, debug;
 uvlong T;
 int freq[128];
 uchar out[8192], *outp = out;
 
+#define dprint	if(debug)fprint
+
 void *
 emallocz(int size)
 {
@@ -149,9 +151,10 @@
 readevent(Tracker *src)
 {
 	uvlong l;
-	int n,t;
+	int c,t,n,v;
 	
-	l = tconv(getvar(src));
+	c = getvar(src);
+	l = tconv(c);
 	run(src->t += l);
 	t = get8(src);
 	if((t & 0x80) == 0){
@@ -164,35 +167,46 @@
 	switch(t >> 4){
 	case 0x8:
 		n = get8(src);
-		get8(src);
+		v = get8(src);
+		dprint(2, "t%zd %d c%d off %d %d\n", src-tr, c, t&15, n, v);
 		src->notes[t & 15][n] = 0;
 		break;
 	case 0x9:
 		n = get8(src);
-		src->notes[t & 15][n] = get8(src);
+		v = get8(src);
+		dprint(2, "t%zd %d c%d on %d %d\n", src-tr, c, t&15, n, v);
+		src->notes[t & 15][n] = v;
 		break;
 	case 0xB:
-		get16(src);
+		n = get8(src);
+		v = get8(src);
+		dprint(2, "t%zd %d c%d ctl %d %d\n", src-tr, c, t&15, n, v);
 		break;
 	case 0xC:
-		get8(src);
+		n = get8(src);
+		dprint(2, "t%zd %d c%d bank %d\n", src-tr, c, t&15, n);
 		break;
 	case 0xE:
-		get16(src);
+		n = get8(src);
+		n = get8(src) << 7 | n & 0x7f;
+		dprint(2, "t%zd %d c%d bend %d\n", src-tr, c, t&15, n);
 		break;
 	case 0xF:
 		t = get8(src);
 		n = get8(src);
 		switch(t){
 		case 0x2F:
+			dprint(2, "t%zd %d eot\n", src-tr, c);
 			src->ended = 1;
 			break;
 		case 0x51:
 			tempo = get16(src) << 8;
 			tempo |= get8(src);
+			dprint(2, "t%zd %d tempo %d\n", src-tr, c, tempo);
 			break;
 		case 5:
-			write(2, src->data, n);
+			if(!debug)
+				write(2, src->data, n);
 			skip(src, n);
 			break;
 		default:
@@ -217,6 +231,9 @@
 	case 'c':
 		ofd = 1;
 		break;
+	case 'v':
+		debug = 1;
+		break;
 	}ARGEND;
 	if(*argv != nil)
 		fd = open(*argv, OREAD);
@@ -229,6 +246,8 @@
 	get16(nil);
 	ntrack = get16(nil);
 	div = get16(nil);
+	if(debug)
+		fprint(2, "div %d\n", div);
 	tr = emallocz(ntrack * sizeof(*tr));
 	for(i = 0; i < ntrack; i++){
 		if(get32(nil) != 0x4D54726B)