ref: bc97f719f79c6570db9129b337bb8eb5c5020239
dir: /midi-debug/
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)