[gstreamer-bugs] [Bug 169383] [dv1394src] Should provide a clock

GStreamer (bugzilla.gnome.org) bugzilla at gnome.org
Fri Mar 5 03:13:09 PST 2010


https://bugzilla.gnome.org/show_bug.cgi?id=169383
  GStreamer | gst-plugins-good | git

Andoni Morales <ylatuya> changed:

           What    |Removed                     |Added
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                 CC|                            |ylatuya at gmail.com

--- Comment #16 from Andoni Morales <ylatuya at gmail.com> 2010-03-05 11:13:01 UTC ---
The current clock is wrong and a faster than what it should  be
(http://www.dennedy.org/libraw1394/API-raw1394-read-cycle-timer.html). I
proposed a fix here:https://bugzilla.gnome.org/show_bug.cgi?id=593910.
The seconds counter and the cycles counter must be treated as separate counter.
Each cycle is 125us and the cycle counter has 13 bits:
2^13 * 125us != 1 second
Thus the overflow of the cycle counter is not a second.
The good approach is to read the seconds from the seconds counter and than sum
the microseconds from the cycle counter

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