From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Wed, 6 Sep 2017 21:09:25 +0000 (+0000)
Subject: [WDMAUD.DRV/KMIXER] Replace a float mul/div/round operation with integer math.
X-Git-Tag: backups/GSoC_2017/rapps@75905~4^2~27
X-Git-Url: https://git.reactos.org/?p=reactos.git;a=commitdiff_plain;h=801106003258b3a91cd16c5d66dc138c807eefe1

[WDMAUD.DRV/KMIXER] Replace a float mul/div/round operation with integer math.

svn path=/trunk/; revision=75779
---

diff --git a/reactos/dll/win32/wdmaud.drv/mixer.c b/reactos/dll/win32/wdmaud.drv/mixer.c
index 0f00ccc96e5..73cd376277e 100644
--- a/reactos/dll/win32/wdmaud.drv/mixer.c
+++ b/reactos/dll/win32/wdmaud.drv/mixer.c
@@ -50,7 +50,7 @@ PerformSampleRateConversion(
         return ERROR_NOT_ENOUGH_MEMORY;
     }
 
-    NewSamples = lrintf(((FLOAT)NumSamples * ((FLOAT)NewRate / (FLOAT)OldRate))) + 2;
+    NewSamples = ((((ULONG64)NumSamples * NewRate) + (OldRate / 2)) / OldRate) + 2;
 
     FloatOut = HeapAlloc(GetProcessHeap(), 0, NewSamples * NumChannels * sizeof(FLOAT));
     if (!FloatOut)
diff --git a/reactos/drivers/wdm/audio/filters/kmixer/pin.c b/reactos/drivers/wdm/audio/filters/kmixer/pin.c
index d00ba0438b1..eb2196c3585 100644
--- a/reactos/drivers/wdm/audio/filters/kmixer/pin.c
+++ b/reactos/drivers/wdm/audio/filters/kmixer/pin.c
@@ -59,7 +59,7 @@ PerformSampleRateConversion(
         return STATUS_INSUFFICIENT_RESOURCES;
     }
 
-    NewSamples = lrintf(((FLOAT)NumSamples * ((FLOAT)NewRate / (FLOAT)OldRate))) + 2;
+    NewSamples = ((((ULONG64)NumSamples * NewRate) + (OldRate / 2)) / OldRate) + 2;
 
     FloatOut = ExAllocatePool(NonPagedPool, NewSamples * NumChannels * sizeof(FLOAT));
     if (!FloatOut)