--- np2/sound/sound.c	2003/10/20 06:36:33	1.4
+++ np2/sound/sound.c	2003/11/13 17:01:17	1.8
@@ -22,6 +22,7 @@ typedef struct {
 	SINT32	*buffer;
 	SINT32	*ptr;
 	UINT	samples;
+	UINT	reserve;
 	UINT	remain;
 	CBTBL	*cbreg;
 	CBTBL	cb[STREAM_CBMAX];
@@ -32,9 +33,11 @@ static	SNDSTREAM	sndstream;
 
 static void streamreset(void) {
 
+	SNDCSEC_ENTER;
 	sndstream.ptr = sndstream.buffer;
-	sndstream.remain = sndstream.samples;
+	sndstream.remain = sndstream.samples + sndstream.reserve;
 	sndstream.cbreg = sndstream.cb;
+	SNDCSEC_LEAVE;
 }
 
 static void streamprepare(UINT samples) {
@@ -61,6 +64,7 @@ static void streamprepare(UINT samples) 
 BOOL sound_create(UINT rate, UINT ms) {
 
 	UINT	samples;
+	UINT	reserve;
 
 	ZeroMemory(&sndstream, sizeof(sndstream));
 	switch(rate) {
@@ -81,15 +85,21 @@ BOOL sound_create(UINT rate, UINT ms) {
 	soundcfg.rate = rate;
 	sound_changeclock();
 
-	sndstream.buffer = (SINT32 *)_MALLOC(samples * 2 * sizeof(SINT32),
-																"stream");
+#if defined(SOUNDRESERVE)
+	reserve = rate * SOUNDRESERVE / 1000;
+#else
+	reserve = 0;
+#endif
+	sndstream.buffer = (SINT32 *)_MALLOC((samples + reserve) * 2 
+												* sizeof(SINT32), "stream");
 	if (sndstream.buffer == NULL) {
 		goto scre_err2;
 	}
 	sndstream.samples = samples;
-	streamreset();
+	sndstream.reserve = reserve;
 
 	SNDCSEC_INIT;
+	streamreset();
 	return(SUCCESS);
 
 scre_err2:
@@ -102,10 +112,10 @@ scre_err1:
 void sound_destroy(void) {
 
 	if (sndstream.buffer) {
-		SNDCSEC_TERM;
-
 		soundmng_stop();
+		streamreset();
 		soundmng_destroy();
+		SNDCSEC_TERM;
 		_MFREE(sndstream.buffer);
 		sndstream.buffer = NULL;
 	}
@@ -180,26 +190,32 @@ void sound_sync(void) {
 	}
 	SNDCSEC_ENTER;
 	streamprepare(length);
-	SNDCSEC_LEAVE;
-	soundcfg.writecount += length;
 	soundcfg.lastclock += length * soundcfg.clockbase / soundcfg.hzbase;
 	beep_eventreset();
+	SNDCSEC_LEAVE;
 
+	soundcfg.writecount += length;
 	if (soundcfg.writecount >= 100) {
 		soundcfg.writecount = 0;
 		soundmng_sync();
 	}
 }
 
+static volatile int locks = 0;
+
 const SINT32 *sound_pcmlock(void) {
 
 const SINT32 *ret;
 
+	if (locks) {
+		return(NULL);
+	}
+	locks++;
 	ret = sndstream.buffer;
 	if (ret) {
 		SNDCSEC_ENTER;
-		if (sndstream.remain) {
-			streamprepare(sndstream.remain);
+		if (sndstream.remain > sndstream.reserve) {
+			streamprepare(sndstream.remain - sndstream.reserve);
 			soundcfg.lastclock = I286_CLOCK + I286_BASECLOCK - I286_REMCLOCK;
 			beep_eventreset();
 		}
@@ -209,10 +225,20 @@ const SINT32 *ret;
 
 void sound_pcmunlock(const SINT32 *hdl) {
 
+	int		leng;
+
 	if (hdl) {
-		sndstream.ptr = sndstream.buffer;
-		sndstream.remain = sndstream.samples;
+		leng = sndstream.reserve - sndstream.remain;
+		if (leng > 0) {
+			CopyMemory(sndstream.buffer,
+						sndstream.buffer + (sndstream.samples * 2),
+												leng * 2 * sizeof(SINT32));
+		}
+		sndstream.ptr = sndstream.buffer + (leng * 2);
+		sndstream.remain = sndstream.samples + sndstream.reserve - leng;
+//		sndstream.remain += sndstream.samples;
 		SNDCSEC_LEAVE;
+		locks--;
 	}
 }