Back-end driver interface for Core Audio.

Added option for Core Audio to preference dialog.

CMakeLists.txt

@@ -150,6 +150,7 @@ SET(JACK_MIN_VERSION "0.98.0")
 option(BUILD_JACK    "Build with support for ${JACK_LONGNAME} audio backend. JACK >= ${JACK_MIN_VERSION} will be needed." ON)
 option(BUILD_PULSEAUDIO "Build with support for PulseAudio audio backend." ON)
 option(BUILD_ALSA "Build with support for ALSA audio backend." ON)
+option(BUILD_COREAUDIO "Build with support for CoreAudio audio backend." ON)
 option(BUILD_PORTAUDIO "Build with support for PortAudio audio backend." ON)
 option(BUILD_PORTMIDI "Build with support for PortAudio's MIDI features." ${BUILD_PORTAUDIO}) # PortAudio required
 option(BUILD_PCH "Build using precompiled headers." ON)
@@ -188,7 +189,7 @@ if (APPLE)
 
       set(HAS_AUDIOFILE TRUE)            # Requires libsndfile
       set(MAC_APPCAST_URL "")
-
+      
       find_library(AudioToolboxFW        NAMES AudioToolbox)
       find_library(AudioUnitFW           NAMES AudioUnit)
       find_library(CoreAudioFW           NAMES CoreAudio)
@@ -499,14 +500,24 @@ ELSE(BUILD_JACK)
      MESSAGE(STATUS "${JACK_LONGNAME} support disabled")
 ENDIF(BUILD_JACK)
 
+##
+## CoreAudio
+##
+
+if (BUILD_COREAUDIO)
+    if (APPLE)
+        message("Including CoreAudio support.")
+        set(USE_COREAUDIO 1)
+    endif (APPLE)
+endif (APPLE)
 
 ##
 ## PortAudio
 ##
 
 if (BUILD_PORTAUDIO)
     if (MINGW OR MSVC)
-        set ( USE_PORTAUDIO 1 )
+      set ( USE_PORTAUDIO 1 )
         include(FindPortAudio)
         add_library(portaudiodll SHARED IMPORTED)
         set_target_properties(portaudiodll PROPERTIES IMPORTED_IMPLIB ${PORTAUDIO_LIBRARY})