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authorChristophe Fergeau <cfergeau@mandriva.com>2010-08-17 20:27:55 +0200
committerChristophe Fergeau <cfergeau@mandriva.com>2010-08-17 20:27:55 +0200
commitd188fa7386f37b21de96d557aafa7fefdfda9b73 (patch)
tree337dc81a18ff58aa9c737046d77e11f5dfaaa8de /airtunes2.rst
parentdescribe "first" behaviour for RTP packets (diff)
downloadAirtunes2-d188fa7386f37b21de96d557aafa7fefdfda9b73.tar.xz
Airtunes2-d188fa7386f37b21de96d557aafa7fefdfda9b73.zip
improve description of NTP timestamps
Diffstat (limited to 'airtunes2.rst')
-rw-r--r--airtunes2.rst7
1 files changed, 5 insertions, 2 deletions
diff --git a/airtunes2.rst b/airtunes2.rst
index 195d178..f82f558 100644
--- a/airtunes2.rst
+++ b/airtunes2.rst
@@ -164,8 +164,11 @@ RtpHeader
NTP Timestamp
~~~~~~~~~~~~~
-This is an NTP Timestamp as described in RFC 3450 Section 4. and RFC 1305
-(TODO: check this is actually true)
+This is an NTP Timestamp as described in RFC 3450 Section 4. and RFC 1305.
+The timestamps used by iTunes and the device seems to come from a monotonic
+clock which starts at 0 when they just started/booted. This monotonic clock's
+origin of time is the unix epoch, which corresponds to 0x83aa7e80 seconds
+in NTP time.
::