--- src/audio/coreaudio/SDL_coreaudio.h
+++ src/audio/coreaudio/SDL_coreaudio.h
@@ -1,7 +1,7 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
   arising from the use of this software.
@@ -19,58 +19,39 @@
   3. This notice may not be removed or altered from any source distribution.
 */
 #include "../../SDL_internal.h"
 
-#ifndef SDL_coreaudio_h_
-#define SDL_coreaudio_h_
+#ifndef _SDL_coreaudio_h
+#define _SDL_coreaudio_h
 
 #include "../SDL_sysaudio.h"
 
 #if !defined(__IPHONEOS__)
-#define MACOSX_COREAUDIO
+#define MACOSX_COREAUDIO 1
 #endif
 
-#ifdef MACOSX_COREAUDIO
+#if MACOSX_COREAUDIO
 #include <CoreAudio/CoreAudio.h>
+#include <CoreServices/CoreServices.h>
 #else
-#import <AVFoundation/AVFoundation.h>
-#import <UIKit/UIApplication.h>
+#include <AudioToolbox/AudioToolbox.h>
 #endif
 
-#include <AudioToolbox/AudioToolbox.h>
 #include <AudioUnit/AudioUnit.h>
 
-/* Things named "Master" were renamed to "Main" in macOS 12.0's SDK. */
-#ifdef MACOSX_COREAUDIO
-#include <AvailabilityMacros.h>
-#ifndef MAC_OS_VERSION_12_0
-#define kAudioObjectPropertyElementMain kAudioObjectPropertyElementMaster
-#endif
-#endif
-
 /* Hidden "this" pointer for the audio functions */
-#define _THIS SDL_AudioDevice *this
+#define _THIS   SDL_AudioDevice *this
 
 struct SDL_PrivateAudioData
 {
-    SDL_Thread *thread;
-    AudioQueueRef audioQueue;
-    int numAudioBuffers;
-    AudioQueueBufferRef *audioBuffer;
+    AudioUnit audioUnit;
+    int audioUnitOpened;
     void *buffer;
     UInt32 bufferOffset;
     UInt32 bufferSize;
-    AudioStreamBasicDescription strdesc;
-    SDL_sem *ready_semaphore;
-    char *thread_error;
-#ifdef MACOSX_COREAUDIO
+#if MACOSX_COREAUDIO
     AudioDeviceID deviceID;
-    SDL_atomic_t device_change_flag;
-#else
-    SDL_bool interrupted;
-    CFTypeRef interruption_listener;
 #endif
 };
 
-#endif /* SDL_coreaudio_h_ */
-
+#endif /* _SDL_coreaudio_h */
 /* vi: set ts=4 sw=4 expandtab: */