From d08d6b18c42b4346f82125fd645eb0835a58fe3b Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Mon, 23 Nov 2020 10:55:13 -0800
Subject: [PATCH] Ceil the scaled buffer size instead of round

The result has to be large enough to get the original requested size from it.
---
 alc/backends/coreaudio.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/alc/backends/coreaudio.cpp b/alc/backends/coreaudio.cpp
index 60a2c00a..9f674389 100644
--- a/alc/backends/coreaudio.cpp
+++ b/alc/backends/coreaudio.cpp
@@ -27,6 +27,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <cmath>
+
 #include "alcmain.h"
 #include "alexcpt.h"
 #include "alu.h"
@@ -553,7 +555,7 @@ void CoreAudioCapture::open(const ALCchar *name)
      * conversion ring buffer. Ensure at least 100ms for the total buffer.
      */
     double srateScale{double{outputFormat.mSampleRate} / mDevice->Frequency};
-    auto FrameCount64 = maxu64(static_cast<uint64_t>(mDevice->BufferSize*srateScale + 0.5),
+    auto FrameCount64 = maxu64(static_cast<uint64_t>(std::ceil(mDevice->BufferSize*srateScale)),
         static_cast<UInt32>(outputFormat.mSampleRate)/10);
     FrameCount64 += MAX_RESAMPLER_PADDING;
     if(FrameCount64 > std::numeric_limits<int32_t>::max())