--- np2/sound/sound.c	2003/10/19 14:56:15	1.2
+++ np2/sound/sound.c	2003/10/21 16:27:54	1.5
@@ -8,13 +8,7 @@
 #include	"beep.h"
 
 
-	UINT32	opna_rate = 22050;
-
-static int	writebytes = 0;
-	UINT32	ratebase200 = 110;
-	UINT32	dsound_lastclock = 0;
-
-
+	SOUNDCFG	soundcfg;
 
 
 #define	STREAM_CBMAX	16
@@ -28,6 +22,7 @@ typedef struct {
 	SINT32	*buffer;
 	SINT32	*ptr;
 	UINT	samples;
+	UINT	reserve;
 	UINT	remain;
 	CBTBL	*cbreg;
 	CBTBL	cb[STREAM_CBMAX];
@@ -39,7 +34,7 @@ static	SNDSTREAM	sndstream;
 static void streamreset(void) {
 
 	sndstream.ptr = sndstream.buffer;
-	sndstream.remain = sndstream.samples;
+	sndstream.remain = sndstream.samples + sndstream.reserve;
 	sndstream.cbreg = sndstream.cb;
 }
 
@@ -67,22 +62,13 @@ static void streamprepare(UINT samples) 
 BOOL sound_create(UINT rate, UINT ms) {
 
 	UINT	samples;
+	UINT	reserve;
 
 	ZeroMemory(&sndstream, sizeof(sndstream));
-	if (rate == 0) {
-		return(SUCCESS);
-	}
 	switch(rate) {
 		case 11025:
-			opna_rate = 11025;
-			break;
-
 		case 22050:
-			opna_rate = 22050;
-			break;
-
 		case 44100:
-			opna_rate = 44100;
 			break;
 
 		default:
@@ -94,14 +80,22 @@ BOOL sound_create(UINT rate, UINT ms) {
 	}
 	soundmng_reset();
 
-	sndstream.buffer = (SINT32 *)_MALLOC(samples * 2 * sizeof(SINT32),
-																"stream");
+	soundcfg.rate = rate;
+	sound_changeclock();
+
+#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;
+	sndstream.reserve = reserve;
 	streamreset();
-	ratebase200 = (opna_rate + 199) / 200;
 
 	SNDCSEC_INIT;
 	return(SUCCESS);
@@ -130,11 +124,37 @@ void sound_reset(void) {
 	if (sndstream.buffer) {
 		soundmng_reset();
 		streamreset();
-		dsound_lastclock = I286_CLOCK;
+		soundcfg.lastclock = I286_CLOCK;
 		beep_eventreset();
 	}
 }
 
+void sound_changeclock(void) {
+
+	UINT32	clock;
+	UINT	hz;
+	UINT	hzmax;
+
+	if (sndstream.buffer == NULL) {
+		return;
+	}
+
+	// とりあえず 25で割り切れる。
+	clock = pc.realclock / 25;
+	hz = soundcfg.rate / 25;
+
+	// で、クロック数に合せて調整。(64bit演算しろよな的)
+	hzmax = (1 << (32 - 8)) / (clock >> 8);
+	while(hzmax < hz) {
+		clock = (clock + 1) >> 1;
+		hz = (hz + 1) >> 1;
+	}
+	soundcfg.hzbase = hz;
+	soundcfg.clockbase = clock;
+	soundcfg.minclock = 2 * clock / hz;
+	soundcfg.lastclock = I286_CLOCK;
+}
+
 void sound_streamregist(void *hdl, SOUNDCB cbfn) {
 
 	if (sndstream.buffer) {
@@ -152,29 +172,29 @@ void sound_streamregist(void *hdl, SOUND
 
 void sound_sync(void) {
 
-	UINT	length;
+	UINT32	length;
 
 	if (sndstream.buffer == NULL) {
 		return;
 	}
 
-	length = (I286_CLOCK + I286_BASECLOCK - I286_REMCLOCK
-											- dsound_lastclock) * ratebase200;
-	if (length < pc.dsoundclock2) {
+	length = I286_CLOCK + I286_BASECLOCK - I286_REMCLOCK - soundcfg.lastclock;
+	if (length < soundcfg.minclock) {
 		return;
 	}
-	length /= pc.dsoundclock;
-	if (length) {
-		SNDCSEC_ENTER;
-		streamprepare(length);
-		SNDCSEC_LEAVE;
-		writebytes += length;
-		dsound_lastclock += (length * pc.dsoundclock / ratebase200);
-		beep_eventreset();
+	length = (length * soundcfg.hzbase) / soundcfg.clockbase;
+	if (length == 0) {
+		return;
 	}
+	SNDCSEC_ENTER;
+	streamprepare(length);
+	SNDCSEC_LEAVE;
+	soundcfg.writecount += length;
+	soundcfg.lastclock += length * soundcfg.clockbase / soundcfg.hzbase;
+	beep_eventreset();
 
-	if (writebytes >= 100) {
-		writebytes = 0;
+	if (soundcfg.writecount >= 100) {
+		soundcfg.writecount = 0;
 		soundmng_sync();
 	}
 }
@@ -186,9 +206,9 @@ const SINT32 *ret;
 	ret = sndstream.buffer;
 	if (ret) {
 		SNDCSEC_ENTER;
-		if (sndstream.remain) {
-			streamprepare(sndstream.remain);
-			dsound_lastclock = I286_CLOCK;
+		if (sndstream.remain > sndstream.reserve) {
+			streamprepare(sndstream.remain - sndstream.reserve);
+			soundcfg.lastclock = I286_CLOCK + I286_BASECLOCK - I286_REMCLOCK;
 			beep_eventreset();
 		}
 	}
@@ -197,9 +217,17 @@ 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;
 		SNDCSEC_LEAVE;
 	}
 }