gst-libs/gst/play/gstplay.c: Reworked the pipeline from scratch. Visualization is...

gst-libs/gst/play/gstplay.c: Reworked the pipeline from scratch. Visualization is back and switch went out as i reali...

Original commit message from CVS:
2004-01-23  Julien MOUTTE  <julien@moutte.net>

* gst-libs/gst/play/gstplay.c: (gst_play_pipeline_setup),
(gst_play_set_location), (gst_play_seek_to_time),
(gst_play_set_audio_sink), (gst_play_set_visualization),
(gst_play_connect_visualization), (gst_play_get_sink_element): Reworked
the pipeline from scratch. Visualization is back and switch went out as
i realized it was not possible to use the way i wanted.
* sys/ximage/ximagesink.c: (gst_ximagesink_imagepool_clear),
(gst_ximagesink_change_state), (gst_ximagesink_dispose): Move xcontext
clearing in state change from READY to NULL. So that one can clean the
X ressources keeping the element.
* sys/xvimage/xvimagesink.c: (gst_xvimagesink_xcontext_get),
(gst_xvimagesink_imagepool_clear), (gst_xvimagesink_change_state),
(gst_xvimagesink_colorbalance_set_value),
(gst_xvimagesink_colorbalance_get_value),
(gst_xvimagesink_set_property), (gst_xvimagesink_dispose),
(gst_xvimagesink_init): Same xcontext cleaning than ximagesink in state
change from READY to NULL and fixed some stupid bugs in colorbalance
get/set values. Also added the following feature : when nobody tries to
set some values to the colorbalance levels before the xcontext is
grabbed, then when creating channels list from Xv attributes we set the
internal values to the Xv defaults. This way we handle buggy Xv drivers
that set default hue values far from the middle of the range (Thanks
to Jon Trowbridge for pointing that issue).
* sys/xvimage/xvimagesink.h: Adding a cb_changed boolean to know if
colorbalance levels have been set before xcontext is grabbed.