[macOS] Avoid HALOutput sample rate audio conversion

rdar://116794643
https://bugs.webkit.org/show_bug.cgi?id=271821

Reviewed by Eric Carlson.

Stick to hardware sample rate to avoid sample rate audio conversion at HAL output level.
Manually tested.

* Source/WebCore/platform/mediastream/mac/CoreAudioSharedUnit.cpp:
(WebCore::CoreAudioSharedUnit::setupAudioUnit):

Canonical link: https://commits.webkit.org/276775@main

Source/WebCore/platform/mediastream/mac/CoreAudioSharedUnit.cpp

@@ -351,6 +351,18 @@ OSStatus CoreAudioSharedUnit::setupAudioUnit()
             RELEASE_LOG_ERROR_IF(err, WebRTC, "CoreAudioSharedUnit::setupAudioUnit(%p) unable to set capture unit output device ID %d, error %d (%.4s)", this, (int)defaultOutputDeviceID, (int)err, (char*)&err);
         }
         setOutputDeviceID(!err ? defaultOutputDeviceID : 0);
+    } else {
+        // With HALOutput, we cannot rely on sample rate conversions, we stick to hardware sample rate.
+        static const AudioObjectPropertyAddress nominalSampleRateAddress = {
+            kAudioDevicePropertyNominalSampleRate,
+            kAudioObjectPropertyScopeGlobal,
+            kAudioObjectPropertyElementMain
+        };
+
+        Float64 nominalSampleRate;
+        UInt32 nominalSampleRateSize = sizeof(Float64);
+        if (AudioObjectGetPropertyData(deviceID, &nominalSampleRateAddress, 0, 0, &nominalSampleRateSize, (void*)&nominalSampleRate) == noErr)
+            setSampleRate(nominalSampleRate);
     }
 #endif