From 4c03d8c7043f32cec10f54e4cab08cac2724477b Mon Sep 17 00:00:00 2001
From: iq_132 <1191709+iq132@users.noreply.github.com>
Date: Fri, 17 Aug 2012 04:27:51 +0000
Subject: [PATCH] Minor sound updates. Small speedup for dac.

---
 src/burn/snd/dac.cpp     | 19 ++++++++++---------
 src/burn/snd/samples.cpp |  8 ++++----
 2 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/src/burn/snd/dac.cpp b/src/burn/snd/dac.cpp
index 6416fcbf0..f3193802f 100644
--- a/src/burn/snd/dac.cpp
+++ b/src/burn/snd/dac.cpp
@@ -46,21 +46,22 @@ static void UpdateStream(INT32 chip, INT32 length)
         if (length <= 0) return;
 
         INT16 *lbuf = lBuffer + ptr->nCurrentPosition;
-		INT16 *rbuf = rBuffer + ptr->nCurrentPosition;
+	INT16 *rbuf = rBuffer + ptr->nCurrentPosition;
 
-        INT16 Out = ptr->Output;
+	INT16 lOut = ((ptr->OutputDir & BURN_SND_ROUTE_LEFT ) == BURN_SND_ROUTE_LEFT ) ? ptr->Output : 0;
+        INT16 rOut = ((ptr->OutputDir & BURN_SND_ROUTE_RIGHT) == BURN_SND_ROUTE_RIGHT) ? ptr->Output : 0;
 
         ptr->nCurrentPosition += length;
 
-        if (Out) {              
+        if (rOut && lOut) {              
                 while (length--) {
-                        if ((ptr->OutputDir & BURN_SND_ROUTE_LEFT) == BURN_SND_ROUTE_LEFT) {
-							*lbuf++ = *lbuf + Out;
-						}
-						if ((ptr->OutputDir & BURN_SND_ROUTE_RIGHT) == BURN_SND_ROUTE_RIGHT) {
-							*rbuf++ = *rbuf + Out;
-						}
+                        *lbuf++ = *lbuf + lOut;
+			*rbuf++ = *rbuf + rOut;
                 }
+        } else if (lOut) {              
+                while (length--) *lbuf++ = *lbuf + lOut;
+        } else if (rOut) {            
+                while (length--) *rbuf++ = *rbuf + rOut;
         }
 }
 
diff --git a/src/burn/snd/samples.cpp b/src/burn/snd/samples.cpp
index 7a0e748ef..33f1c3e20 100644
--- a/src/burn/snd/samples.cpp
+++ b/src/burn/snd/samples.cpp
@@ -34,17 +34,17 @@ static void make_raw(UINT8 *src, UINT32 len)
 	if (ptr[0] != 'R' || ptr[1] != 'I' || ptr[2] != 'F' || ptr[3] != 'F') return;
 	ptr += 4; // skip RIFF
 
-	UINT32 length = get_long();	ptr += 4; // total length of file
+	UINT32 length = get_long();		ptr += 4; // total length of file
 	if (len < length) length = len - 8;		  // first 8 bytes (RIFF + Len)
 
 	/* "WAVEfmt " */			ptr += 8; // WAVEfmt + 1 space
-	UINT32 length2 = get_long();	ptr += 4; // Wavefmt length
+	UINT32 length2 = get_long();		ptr += 4; // Wavefmt length
 /*	unsigned short format = get_short();  */ptr += 2; // format?
-	UINT16 channels = get_short();	ptr += 2; // channels
+	UINT16 channels = get_short();		ptr += 2; // channels
 	UINT32 sample_rate = get_long();	ptr += 4; // sample rate
 /*	unsigned int speed = get_long();      */ptr += 4; // speed - should equal (bits * channels * sample_rate)
 /*	unsigned short align = get_short();   */ptr += 2; // block align	should be ((bits / 8) * channels)
-	UINT16 bits = get_short() / 8;	ptr += 2; // bits per sample	(0010)
+	UINT16 bits = get_short() / 8;		ptr += 2; // bits per sample	(0010)
 	ptr += length2 - 16;				  // get past the wave format chunk
 
 	// are we in the 'data' chunk? if not, skip this chunk.