QuartzCore/CABase.m

   1 #import <QuartzCore/CABase.h>
   2 #import <Foundation/NSString.h>
   3
   4 static double conversionFactor(){
   5    struct mach_timebase_info timebase;
   6    kern_return_t error;
   7
   8    if((mach_timebase_info(&timebase))!=KERN_SUCCESS){
   9     NSLog(@"mach_timebase_info returned %d",error);
  10     return 1;
  11    }
  12
  13    return  0.000000001 * ((double)timebase.numer/(double)timebase.denom);
  14 }
  15
  16 CFTimeInterval CACurrentMediaTime(void) {
  17    uint64_t value=mach_absolute_time();
  18
  19    return ((double) value)*conversionFactor();
  20 }
  21