From ba39c622efc2bd0e832c0573748fec47bcc3bd6c Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Tue, 24 Nov 2020 14:44:13 -0800
Subject: Disable buffer allocation with CoreAudio capture

---
 alc/backends/coreaudio.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'alc/backends/coreaudio.cpp')

diff --git a/alc/backends/coreaudio.cpp b/alc/backends/coreaudio.cpp
index 9f674389..3a56c25f 100644
--- a/alc/backends/coreaudio.cpp
+++ b/alc/backends/coreaudio.cpp
@@ -464,6 +464,14 @@ void CoreAudioCapture::open(const ALCchar *name)
     if(err != noErr)
         throw al::backend_exception{ALC_INVALID_VALUE, "Could not set capture callback: %u", err};
 
+    // Disable buffer allocation for capture
+    Uint32 flag{0};
+    err = AudioUnitSetProperty(mAudioUnit, kAudioUnitProperty_ShouldAllocateBuffer,
+        kAudioUnitScope_Output, 1, &flag, sizeof(flag));
+    if(err != noErr)
+        throw al::backend_exception{ALC_INVALID_VALUE,
+            "Could not disable buffer allocation property: %u", err};
+
     // Initialize the device
     err = AudioUnitInitialize(mAudioUnit);
     if(err != noErr)
-- 
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