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zuke: simplify volume control logic

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Sigrid Solveig Haflínudóttir 2021-10-28 14:59:46 +00:00
parent 4b7e72689d
commit a84f3ef581
1 changed files with 29 additions and 40 deletions
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69
sys/src/cmd/audio/zuke/zuke.c
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@ -116,14 +116,17 @@ static int Scrollheight;
static int Coversz;
static char *
matchvname(char *s)
matchvname(char **s)
{
char *names[] = {"master", "pcm out"};
int i;
int i, l;
for(i = 0; i < nelem(names); i++){
if(strncmp(s, names[i], strlen(names[i])) == 0)
l = strlen(names[i]);
if(strncmp(*s, names[i], l) == 0){
*s += l;
return names[i];
}
}
return nil;
@ -132,53 +135,39 @@ matchvname(char *s)
static void
chvolume(int d)
{
int f, l, r, ol, or;
char *s, *a[2], *n;
int f, x, ox, want, try;
char *s, *e;
Biobuf b;
char *n;
if((f = open("/dev/volume", ORDWR)) < 0)
return;
Binit(&b, f, OREAD);
l = r = 0;
for(; (s = Brdline(&b, '\n')) != nil;){
memset(a, 0, sizeof(a));
if((n = matchvname(s)) != nil && tokenize(s+strlen(n), a, 2) >= 1){
if(a[1] == nil)
a[1] = a[0];
l = ol = atoi(a[0]);
r = or = atoi(a[1]);
if(d == 0)
want = x = -1;
ox = 0;
for(try = 0; try < 10; try++){
for(n = nil; (s = Brdline(&b, '\n')) != nil;){
if((n = matchvname(&s)) != nil && (ox = strtol(s, &e, 10)) >= 0 && s != e)
break;
for(;;){
l += d;
r += d;
fprint(f, "%s %d %d\n", n, l, r);
Bseek(&b, 0, 0);
for(; (s = Brdline(&b, '\n')) != nil;){
memset(a, 0, sizeof(a));
if((n = matchvname(s)) != nil && tokenize(s+strlen(n), a, 2) >= 1){
if(a[1] == nil)
a[1] = a[0];
if(atoi(a[0]) == l && atoi(a[1]) == r)
goto end;
if(atoi(a[0]) != ol && atoi(a[1]) != or)
goto end;
if(l < 0 || r < 0 || l > 100 || r > 100)
goto end;
break;
}
}
}
n = nil;
}
if(want < 0){
want = CLAMP(ox+d, 0, 100);
x = ox;
}
if(n == nil || (d > 0 && ox >= want) || (d < 0 && ox <= want))
break;
x = CLAMP(x+d, 0, 100);
if(fprint(f, "%s %d\n", n, x) < 0)
break;
/* go to eof and back */
while(Brdline(&b, '\n') != nil);
Bseek(&b, 0, 0);
}
end:
volume = (l+r)/2;
if(volume > 100)
volume = 100;
else if(volume < 0)
volume = 0;
volume = CLAMP(ox, 0, 100);
Bterm(&b);
close(f);