Add core audio

Author: Cuda-Chen

Makefile

@@ -54,6 +54,10 @@ ifeq (0, $(call check-alsa))
 $(warning No libasound installed. Check libasound in advance.)
     ENABLE_VIRTIOSND := 0
 endif
+ifeq (0, $(call check-coreaudio))
+$(warning No CoreAudio framework installed.)
+    ENABLE_VIRTIOSND := 0
+endif
 $(call set-feature, VIRTIOSND)
 ifeq ($(call has, VIRTIOSND), 1)
     OBJS_EXTRA += virtio-snd.o

mk/check-libs.mk

@@ -10,8 +10,26 @@ int main(){\n\
 }\n'
 endef
 
+# Create a mininal Core Audio program
+define create-coreaudio-prog
+echo '\
+#include <CoreAudio/CoreAudio.h>\n\
+int main(){\n\
+    AudioComponent comp;\n\
+    comp = AudioComponentFindNext(NULL, &desc);\n\
+    if (comp == NULL) exit (-1);\n\
+    return 0;\n\
+}\n'
+endf
+
 # Check ALSA installation
 define check-alsa
 $(shell $(call create-alsa-prog) | $(CC) -x c -lasound -o /dev/null > /dev/null 2> /dev/null - 
 	&& echo $$?)
 endef
+
+# Check Core Audio installation
+define check-coreaudio
+$(shell $(call create-coreaudo-prog) | $(CC) -x c -framework CoreAudio -o /dev/null > /dev/null 2> /dev/null - 
+	&& echo $$?) 
+endf