[Bug 667303] systemclock: use CoreVideo on Mac OS X

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=667303
  GStreamer | gstreamer (core) | git

Sebastian Dröge (slomo) <slomo> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #204621|none                        |needs-work
             status|                            |

--- Comment #1 from Sebastian Dröge (slomo) <slomo at circular-chaos.org> 2013-07-24 08:54:17 UTC ---
Review of attachment 204621:
 --> (https://bugzilla.gnome.org/review?bug=667303&attachment=204621)

How good is the accuracy of the clock? Is it monotonic?

::: configure.ac
@@ +359,3 @@
+
+HAVE_IOS="no"
+AC_CHECK_HEADER(MobileCoreServices/MobileCoreServices.h, HAVE_IOS="yes",
HAVE_IOS="no", [-])

What's the [-]? And why doesn't it work properly on iOS?

::: gst/gstsystemclock.c
@@ +202,3 @@
+    } else {
+      priv->cv_ratio_n = 1;
+      priv->cv_ratio_d = host_freq / GST_SECOND;

You mean cv_ratio_n = GST_SECOND; cv_ratio_d = host_freq; right? And the
frequency is really reported in nanoseconds by CVGetHostClocKFrequency?

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