python3 and Gst.CLOCK_TYPE_NONE

[filnet]

Hi,

I am using python3 bindings (on Windows 64) and having some issues with Gst.CLOCK_TYPE_NONE.

>>> import gi
>>> from gi.repository import Gst
>>> time = Gst.CLOCK_TIME_NONE
>>> print(time)
18446744073709551615

But CLOCK_TYPE_NONE is supposed to be -1.

Gst-1.0.gir has this:

    <constant name="CLOCK_TIME_NONE"
              value="18446744073709551615"
              c:type="GST_CLOCK_TIME_NONE">
      <doc xml:space="preserve">Constant to define an undefined clock time.</doc>
      <type name="ClockTime" c:type="GstClockTime"/>
    </constant>

Where it gets tricky is that :

- GstClockTime is typedefed as a guint64

- GST_CLOCK_TIME_NONE is defined as ((GstClockTime) -1)

Is this issue specific to Win64 or are other platforms affected in the same way ?

Philippe.

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[Nicolas Dufresne-5]

Le mardi 05 septembre 2017 à 12:25 +0000, philippe renon a écrit :

> Hi,
>
> I am using python3 bindings (on Windows 64) and having some issues
> with Gst.CLOCK_TYPE_NONE.
>
> >>> import gi
> >>> from gi.repository import Gst
> >>> time = Gst.CLOCK_TIME_NONE
> >>> print(time)
> 18446744073709551615
>
> But CLOCK_TYPE_NONE is supposed to be -1.

Wrong namespace, you mean Gst.CLOCK_TIME_NONE. GstClockTime is unsigned
64 bit integer, so -1 does not exist. Some code will use a cast trick,
but in then end CLOCK_TIME_NONE is indeed G_MAXUINT64.

regards,
Nicolas

>
> Gst-1.0.gir has this:
>
>     <constant name="CLOCK_TIME_NONE"
>               value="18446744073709551615"
>               c:type="GST_CLOCK_TIME_NONE">
>       <doc xml:space="preserve">Constant to define an undefined clock
> time.</doc>
>       <type name="ClockTime" c:type="GstClockTime"/>
>     </constant>
>
> Where it gets tricky is that :
> - GstClockTime is typedefed as a guint64
> - GST_CLOCK_TIME_NONE is defined as ((GstClockTime) -1)
>
> Is this issue specific to Win64 or are other platforms affected in
> the same way ?
>
> Philippe.
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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[filnet]

Indeed:

>>> print(GObject.G_MAXUINT64)
18446744073709551615

Thanks!

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