From b33dde81347d200e4929a4f92bf3b0d8f13bab64 Mon Sep 17 00:00:00 2001
From: attila <attila@juce.com>
Date: Tue, 22 Nov 2022 15:39:11 +0100
Subject: [PATCH] CoreAudio:  Report the number of active output channels in
 the device callback

As opposed to the number of hardware output channels.
---
 modules/juce_audio_devices/native/juce_mac_CoreAudio.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/modules/juce_audio_devices/native/juce_mac_CoreAudio.cpp b/modules/juce_audio_devices/native/juce_mac_CoreAudio.cpp
index ffdf9856b8..fafaacf422 100644
--- a/modules/juce_audio_devices/native/juce_mac_CoreAudio.cpp
+++ b/modules/juce_audio_devices/native/juce_mac_CoreAudio.cpp
@@ -1771,10 +1771,13 @@ private:
 
             if (callback != nullptr)
             {
+                const auto numActiveOutputChannels = outputWrapper.getActiveChannels().countNumberOfSetBits();
+                jassert (numActiveOutputChannels <= scratchBuffer.getNumChannels());
+
                 callback->audioDeviceIOCallbackWithContext (channels,
                                                             numChannels,
                                                             scratchBuffer.getArrayOfWritePointers(),
-                                                            scratchBuffer.getNumChannels(),
+                                                            numActiveOutputChannels,
                                                             n,
                                                             context);
             }