From 1899a26c04b0cbb42b4e284eb4febd98e7615e15 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Thu, 1 Nov 2012 19:08:12 -0700
Subject: [PATCH] Allow playing iPod music in the background of SDL
 applications. You can always change your audio session category afterwards if
 you want custom behavior.

---
 src/audio/coreaudio/SDL_coreaudio.c | 10 +++++++++-
 src/audio/coreaudio/SDL_coreaudio.h |  2 ++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/audio/coreaudio/SDL_coreaudio.c b/src/audio/coreaudio/SDL_coreaudio.c
index d6c12555a..a0860528f 100644
--- a/src/audio/coreaudio/SDL_coreaudio.c
+++ b/src/audio/coreaudio/SDL_coreaudio.c
@@ -538,8 +538,16 @@ COREAUDIO_Init(SDL_AudioDriverImpl * impl)
     impl->DetectDevices = COREAUDIO_DetectDevices;
 #else
     impl->OnlyHasDefaultOutputDevice = 1;
+
+    /* Set category to ambient sound so that other music continues playing.
+       You can change this at runtime in your own code if you need different
+       behavior.  If this is common, we can add an SDL hint for this.
+    */
+    AudioSessionInitialize(NULL, NULL, NULL, nil);
+    UInt32 category = kAudioSessionCategory_AmbientSound;
+    AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(UInt32), &category);
 #endif
-    
+
     impl->ProvidesOwnCallbackThread = 1;
 
     return 1;   /* this audio target is available. */
diff --git a/src/audio/coreaudio/SDL_coreaudio.h b/src/audio/coreaudio/SDL_coreaudio.h
index 65941f584..e6b47c8bc 100644
--- a/src/audio/coreaudio/SDL_coreaudio.h
+++ b/src/audio/coreaudio/SDL_coreaudio.h
@@ -35,6 +35,8 @@
 #if MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
 #include <AudioUnit/AUNTComponent.h>
 #endif
+#else
+#include <AudioToolbox/AudioToolbox.h>
 #endif
 
 #include <AudioUnit/AudioUnit.h>