shithub: qk1

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snd: don't queue more audio than needed

--- a/fns.h

+++ b/fns.h

@@ -59,6 +59,7 @@

 char *lerr(void);

 int	sys_mkdir(char *path);

+long sndqueued(void);

 void sndstop(void);

 void sndwrite(uchar *buf, long sz);

 void sndclose(void);

--- a/snd.c

+++ b/snd.c

@@ -492,6 +492,27 @@

 	if(!ainit)

 		return;

+

+	if(sndt == 0)

+		sndt = nanosec() - Te9 / Fpsmax;

+	nsamp = (nanosec() - sndt) / (Te9 / Srate);

+	if(!cls.timedemo)

+		nsamp = (nsamp + 15) & ~15;

+	nsamp -= sndqueued()/Sblk - Srate/Fpsmax;

+	if(nsamp < 1)

+		return;

+	if(nsamp > Ssamp)

+		nsamp = Ssamp;

+	ns = nsamp * Sblk;

+	mixbuf = mixbufs[mixbufi];

+	samplesfx();

+	sampt += nsamp;

+	if(ns != 0){

+		sndwrite(mixbuf, ns);

+		mixbufi = (mixbufi + 1) % nelem(mixbufs);

+	}

+	sndt = nanosec();

+

 	VectorCopy(origin, listener_origin);

 	VectorCopy(forward, listener_forward);

 	VectorCopy(right, listener_right);

@@ -524,22 +545,6 @@

 			}

 		}

 	}

-	if(sndt == 0)

-		sndt = nanosec() - Te9 / Fpsmax;

-	nsamp = (nanosec() - sndt) / (Te9 / Srate);

-	if(!cls.timedemo)

-		nsamp = (nsamp + 15) & ~15;

-	if(nsamp > Ssamp)

-		nsamp = Ssamp;

-	ns = nsamp * Sblk;

-	mixbuf = mixbufs[mixbufi];

-	samplesfx();

-	sampt += nsamp;

-	if(ns != 0){

-		sndwrite(mixbuf, ns);

-		mixbufi = (mixbufi + 1) % nelem(mixbufs);

-	}

-	sndt = nanosec();

 }

 void

--- a/snd_plan9.c

+++ b/snd_plan9.c

@@ -6,6 +6,17 @@

 static uchar *mixbuf;

 static Channel *ach;

+long

+sndqueued(void)

+{

+	Dir *d;

+	long n;

+

+	n = (d = dirfstat(afd)) != nil ? d->length : 0;

+	free(d);

+	return n;

+}

+

 static void

 auproc(void *p)

 {

--- a/unix/snd_sdl.c

+++ b/unix/snd_sdl.c

@@ -3,6 +3,12 @@

 static SDL_AudioDeviceID adev;

+long

+sndqueued(void)

+{

+	return SDL_GetQueuedAudioSize(adev);

+}

+

 void

 sndstop(void)

 {