From 196b999379dcba341f7e0d51c76b864fb8e3fa86 Mon Sep 17 00:00:00 2001
From: "Jake.Stine" <Jake.Stine@a6443dda-0b58-4228-96e9-037be469359c>
Date: Sat, 1 Nov 2008 06:32:52 +0000
Subject: [PATCH] Fixes timings on PAL games. (no audio underruns after 15+
 minutes of testing!)

git-svn-id: http://pcsx2-playground.googlecode.com/svn/trunk@262 a6443dda-0b58-4228-96e9-037be469359c
---
 pcsx2/Counters.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/pcsx2/Counters.c b/pcsx2/Counters.c
index 798ee7cb92..14cae9e168 100644
--- a/pcsx2/Counters.c
+++ b/pcsx2/Counters.c
@@ -143,7 +143,7 @@ void UpdateVSyncRate() {
 		SysPrintf("Framelimiter rate updated (UpdateVSyncRate): %d fps\n", Config.CustomFps);
 	}
 	else if (Config.PsxType & 1) {
-		iTicks = (GetTickFrequency() / 5000) * 100;
+		iTicks = (GetTickFrequency() * 100) / 5000;
 		SysPrintf("Framelimiter rate updated (UpdateVSyncRate): 50 fps Pal\n");
 	}
 	else {
@@ -163,6 +163,9 @@ void FrameLimiter()
 	iEnd = GetCPUTicks();
 
 	if (iEnd>=iExpectedEnd) {
+
+		// Compensation: If the framelate drops too low, reset the 
+		// expected value.  This avoids "fast forward" syndrome.
 		u64 diff = iEnd-iExpectedEnd;
 		if ((diff>>3)>iTicks) iExpectedEnd=iEnd;
 	}
@@ -171,7 +174,9 @@ void FrameLimiter()
 		iEnd = GetCPUTicks();
 	} while (iEnd<iExpectedEnd);
 
-	iStart = iExpectedEnd; //remember the expected value frame. improves smoothness
+	// remember the expected value frame. improves smoothness by encouraging
+	// the framelimiter to play a little "catch up" after a slow frame.
+	iStart = iExpectedEnd; 
 }
 
 extern u32 CSRw;