shithub: neindaw

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free voices that faded out below "silence" threshold (chosen to be 0 when converted to s16)

--- a/fs.c

+++ b/fs.c

@@ -9,6 +9,7 @@

 #define MAX(a,b) ((a)>=(b)?(a):(b))

 #define MIN(a,b) ((a)<=(b)?(a):(b))

+#define Silence 0.00003f

 enum {

 	Maxobjs = 64,

@@ -150,7 +151,7 @@

 static int

 auxreaddsp(Aux *a, float *b, int total)

 {

-	int i, j, n, cross;

+	int i, j, n, cross, nzeromax;

 	Voice *v;

 	float *m;

 	State *s;

@@ -173,6 +174,8 @@

 	v = s->voice;

 	cross = -1;

+	a->numvoices = 0;

+	nzeromax = a->rate / 5; /* 1/5th of a second, assuming it's mono */

 	for (i = 0, n = total; i < nelem(s->voice) && n > 0; i++, v++) {

 		if (v->dsp == nil)

 			continue;

@@ -194,6 +197,7 @@

 			}

 			v->state = Vplaying;

 			v->samples = 0;

+			v->nzero = 0;

 			/* slippery floor */

 		case Vplaying:

 			if (n < 1)

@@ -206,7 +210,18 @@

 				b[j] += m[j];

 				if (s->crossvoice && cross < 0 && j > 0 && CROSS(m[j-1], m[j]))

 					cross = j;

+				if (m[j] >= -Silence && m[j] <= Silence)

+					v->nzero++;

+				else

+					v->nzero = 0;

 			}

+

+			if (v->nzero >= nzeromax) { /* been quite for a while? shut it */

+				cross = 0;

+				shutup(s, v);

+			} else {

+				a->numvoices++;

+			}

 		}

 	}

@@ -247,7 +262,7 @@

 		break;

 	case Xdspctl:

 		o = auxtype2obj(&a->type);

-		sprint(b, "numin\t%d\nnumout\t%d\trate\t%d\n", o->numin, o->numout, o->rate);

+		sprint(b, "numin\t%d\nnumout\t%d\nrate\t%d\nnumvoices\t%d\n", o->numin, o->numout, o->rate, o->numvoices);

 		readstr(r, b);

 		respond(r, nil);

 		break;

--- a/fs.h

+++ b/fs.h

@@ -38,6 +38,7 @@

 	int numin;

 	int numout;

 	int rate;

+	int numvoices;

 	struct UI *ui;

 	State *state;

@@ -69,6 +70,7 @@

 	uvlong samples;

 	Auxdsp *dsp;

 	int state;

+	int nzero;

 };

 struct State {