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audiohda: start playback only when we have a minimum delay buffered

--- a/sys/src/9/pc/audiohda.c

+++ b/sys/src/9/pc/audiohda.c

@@ -1319,9 +1319,12 @@

 static void

 hdakick(Ctlr *ctlr)

 {

+	int delay;

+

 	if(ctlr->sout.active)

 		return;

-	if(buffered(&ctlr->sout.ring) > Blocksize)

+	delay = ctlr->adev->delay*BytesPerSample;

+	if(buffered(&ctlr->sout.ring) >= delay)

 		streamstart(ctlr, &ctlr->sout);

 }

@@ -1486,7 +1489,13 @@

 		adev->speed = a[0];

 		break;

 	case Vdelay:

-		adev->delay = a[0];

+		if(a[0] < Blocksize/BytesPerSample) {

+			adev->delay = Blocksize/BytesPerSample;

+		} else if(a[0] > (ctlr->sout.ring.nbuf/BytesPerSample)-1) {

+			adev->delay = (ctlr->sout.ring.nbuf/BytesPerSample)-1;

+		} else {

+			adev->delay = a[0];

+		}

 		break;

 	}

 	return 0;