add new API pa_rtclock_from_wallclock()

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/glitch-free@2234 fefdeb5f-60dc-0310-8127-8f9354f1896f

2 files changed, 23 insertions, 0 deletions

diff --git a/src/pulsecore/rtclock.c b/src/pulsecore/rtclock.c
index 07d776e4..e74e5243 100644
--- a/src/pulsecore/rtclock.c
+++ b/src/pulsecore/rtclock.c
@@ -96,3 +96,24 @@ pa_usec_t pa_rtclock_usec(void) {
 
     return pa_timeval_load(pa_rtclock_get(&tv));
 }
+
+struct timeval* pa_rtclock_from_wallclock(struct timeval *tv) {
+
+#ifdef HAVE_CLOCK_GETTIME
+    struct timeval wc_now, rt_now;
+
+    pa_gettimeofday(&wc_now);
+    pa_rtclock_get(&rt_now);
+
+    pa_assert(tv);
+
+    if (pa_timeval_cmp(&wc_now, tv) < 0)
+        pa_timeval_add(&rt_now, pa_timeval_diff(tv, &wc_now));
+    else
+        pa_timeval_sub(&rt_now, pa_timeval_diff(&wc_now, tv));
+
+    *tv = rt_now;
+#endif
+
+    return tv;
+}
diff --git a/src/pulsecore/rtclock.h b/src/pulsecore/rtclock.h
index f0360af3..f68ad761 100644
--- a/src/pulsecore/rtclock.h
+++ b/src/pulsecore/rtclock.h
@@ -40,4 +40,6 @@ pa_bool_t pa_rtclock_hrtimer(void);
 /* timer with a resolution better than this are considered high-resolution */
 #define PA_HRTIMER_THRESHOLD_USEC 10
 
+struct timeval* pa_rtclock_from_wallclock(struct timeval *tv);
+
 #endif