arm/aarch64: Use mach_absolute_time as timer on apple platforms

This is much less precise than the cycle counter register, but
the cycle counter register is not available on apple platforms
(and on linux, it requires a kernel module for allowing user mode
access).
Signed-off-by: Martin Storsjö <martin@martin.st>

libavutil/aarch64/timer.h

@@ -24,7 +24,13 @@
 #include <stdint.h>
 #include "config.h"
 
-#if HAVE_INLINE_ASM
+#if defined(__APPLE__)
+
+#include <mach/mach_time.h>
+
+#define AV_READ_TIME mach_absolute_time
+
+#elif HAVE_INLINE_ASM
 
 #define AV_READ_TIME read_time
 

libavutil/arm/timer.h

@@ -24,7 +24,13 @@
 #include <stdint.h>
 #include "config.h"
 
-#if HAVE_INLINE_ASM && defined(__ARM_ARCH_7A__)
+#if defined(__APPLE__)
+
+#include <mach/mach_time.h>
+
+#define AV_READ_TIME mach_absolute_time
+
+#elif HAVE_INLINE_ASM && defined(__ARM_ARCH_7A__)
 
 #define AV_READ_TIME read_time