iOS: Refactored iOSAudioDevice to support multi-channel audio devices and improve the handling of sample rate changes from other apps

modules/juce_audio_devices/juce_audio_devices.h

@@ -138,6 +138,13 @@
  #define JUCE_USE_WINRT_MIDI 0
 #endif
 
+/** Config: JUCE_DISABLE_AUDIO_MIXING_WITH_OTHER_APPS
+    Turning this on gives your app exclusive access to the system's audio
+    on platforms which support it (currently iOS only).
+*/
+#ifndef JUCE_DISABLE_AUDIO_MIXING_WITH_OTHER_APPS
+ #define JUCE_DISABLE_AUDIO_MIXING_WITH_OTHER_APPS 0
+#endif
 
 //==============================================================================
 #include "midi_io/juce_MidiInput.h"

modules/juce_audio_devices/native/juce_ios_Audio.h

@@ -23,7 +23,7 @@
 namespace juce
 {
 
-struct iOSAudioIODeviceType;
+class iOSAudioIODeviceType;
 
 class iOSAudioIODevice : public AudioIODevice
 {
@@ -77,10 +77,10 @@ public:
 
 private:
     //==============================================================================
-    iOSAudioIODevice (const String&);
+    iOSAudioIODevice (iOSAudioIODeviceType&, const String&, const String&);
 
     //==============================================================================
-    friend struct iOSAudioIODeviceType;
+    friend class iOSAudioIODeviceType;
     friend struct AudioSessionHolder;
 
     struct Pimpl;