Re: Querying stream position/duration with gstmm

[José Alburquerque <jaalburquerque cox net>]

Murray Cumming wrote:
> On Wed, 2007-12-12 at 23:22 -0500, José Alburquerque wrote:
>   
> > I worked a little on querying stream positions and duration so I 
> > modified the player example to print a "status line" showing the 
> > position/duration of the ogg stream.  Would you be able to look at/check 
> > in this patch if it's ok?  Thanks.
> >     
>
> I have checked that in, though I made some small changes.
>
> You wrapped
>   gboolean gst_element_query_position(GstElement *element, GstFormat
> *format, gint64 *cur);
> as
>   bool query_position(Format& format, ClockTime& position)
>
> Why the change of type for position? Is that an error in the gstreamer C
> API?
>
>   
While working on the element query example (GADM 11.1 
<http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-queryevents.html#section-querying>), 
I noticed that, although gst_element_query_position() works with a 
gint64, the C macros used with the position (like GST_TIME_ARGS and 
GST_FORMAT_TIME in gstclock.h) imply that they are working with a 
GstClockTime.  Since C++ is strongly typed and C is not, I'm thinking 
that the developers used gint64 and GstClockTime interchangeably.  In 
C++ types are more enforced so I thought we might use Gst::ClockTime 
instead, but this might not be the best thing to do.  What do you think?

-Jose