From e9bfbdf3862c62c065550292965514cf97eaacb2 Mon Sep 17 00:00:00 2001
From: Mooneer Salem <mooneer@gmail.com>
Date: Sun, 25 May 2025 12:43:59 -0700
Subject: [PATCH] Windows: determine minimum number of audio channels
 supported.

---
 src/audio/WASAPIAudioEngine.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/audio/WASAPIAudioEngine.cpp b/src/audio/WASAPIAudioEngine.cpp
index 647a0378..7960331b 100644
--- a/src/audio/WASAPIAudioEngine.cpp
+++ b/src/audio/WASAPIAudioEngine.cpp
@@ -419,6 +419,26 @@ AudioDeviceSpecification WASAPIAudioEngine::getDeviceSpecification_(IMMDevice* d
     spec.defaultSampleRate = streamFormat->nSamplesPerSec;
     spec.maxChannels = streamFormat->nChannels;
     spec.minChannels = streamFormat->nChannels;
+    
+    // Determine minimum number of channels supported.
+    for (int channel = spec.maxChannels - 1; channel >= 1; channel--)
+    {
+        WAVEFORMATEX* closestFormat = nullptr;
+        streamFormat->nChannels = channel;
+        if (audioClient->IsFormatSupported(AUDCLNT_SHAREMODE_SHARED, streamFormat, &closestFormat) == S_OK)
+        {
+            spec.minChannels = channel;
+        }
+        if (closestFormat != nullptr)
+        {
+            CoTaskMemFree(closestFormat);
+        }
+        
+        if (spec.minChannels != channel)
+        {
+            break;
+        }
+    }
 
     CoTaskMemFree(streamFormat);
     audioClient->Release();