From 81439c5f35e604174408a2aaf4e4dec11b81ac39 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Fri, 17 May 2013 19:54:37 +0200
Subject: timer: refactor, add 64 bit timer function

Make OS specific timer code export a mp_raw_time_us() function, and
add generic implementations of GetTimer()/GetTimerMS() using this
function. New mpv code is supposed to call mp_time_us() in situations
where precision is absolutely needed, or mp_time_s() otherwise.

Make it so that mp_time_us() will return a value near program start.
We don't set it to 0 though to avoid confusion with relative vs.
absolute time. Instead, pick an arbitrary offset.

Move the test program in timer-darwin.c to timer.c, and modify it to
work with the generic timer functions.
---
 osdep/timer-darwin.c | 66 +++++++---------------------------------------------
 1 file changed, 9 insertions(+), 57 deletions(-)

(limited to 'osdep/timer-darwin.c')

diff --git a/osdep/timer-darwin.c b/osdep/timer-darwin.c
index 1ce9cd584b..e5f751915e 100644
--- a/osdep/timer-darwin.c
+++ b/osdep/timer-darwin.c
@@ -27,72 +27,24 @@
 #include "core/mp_msg.h"
 #include "timer.h"
 
-/* global variables */
 static double timebase_ratio;
 
-
-/* the core sleep function, uses floats and is used in MPlayer G2 */
-static float sleep_accurate(float time_frame)
+void mp_sleep_us(int64_t us)
 {
-	uint64_t deadline = time_frame / timebase_ratio + mach_absolute_time();
-
-	mach_wait_until(deadline);
-
-	return (mach_absolute_time() - deadline) * timebase_ratio;
-}
+    uint64_t deadline = us / 1e6 / timebase_ratio + mach_absolute_time();
 
-/* wrapper for MPlayer G1 */
-int usec_sleep(int usec_delay)
-{
-  return sleep_accurate(usec_delay / 1e6) * 1e6;
+    mach_wait_until(deadline);
 }
 
-
-/* current time in microseconds */
-unsigned int GetTimer(void)
+uint64_t mp_raw_time_us(void)
 {
-  return (unsigned int)(uint64_t)(mach_absolute_time() * timebase_ratio * 1e6);
+    return mach_absolute_time() * timebase_ratio * 1e6;
 }
 
-/* current time in milliseconds */
-unsigned int GetTimerMS(void)
+void mp_raw_time_init(void)
 {
-  return (unsigned int)(uint64_t)(mach_absolute_time() * timebase_ratio * 1e3);
-}
-
-/* initialize timer, must be called at least once at start */
-void InitTimer(void)
-{
-  struct mach_timebase_info timebase;
-
-  mach_timebase_info(&timebase);
-  timebase_ratio = (double)timebase.numer / (double)timebase.denom
-    * (double)1e-9;
-}
-
-#if 0
-#include <stdio.h>
-
-int main(void) {
-  int i,j, r, c = 200;
-  long long t = 0;
-
-  InitTimer();
-
-  for (i = 0; i < c; i++) {
-    const int delay = rand() / (RAND_MAX / 1e5);
-    j = GetTimer();
-#if 1
-    r = usec_sleep(delay);
-#else
-    r = sleep_accurate(delay / 1e6) * 1e6;
-#endif
-    j = (GetTimer() - j) - delay;
-    printf("sleep time:%8i %5i (%i)\n", delay, j, j - r);
-    t += j - r;
-  }
-  fprintf(stderr, "average error:\t%lli\n", t / c);
+    struct mach_timebase_info timebase;
 
-  return 0;
+    mach_timebase_info(&timebase);
+    timebase_ratio = (double)timebase.numer / (double)timebase.denom * 1e-9;
 }
-#endif
-- 
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