gst/synaesthesia/gstsynaesthesia.c: Fix up synaesthesia to work under different sampl...

gst/synaesthesia/gstsynaesthesia.c: Fix up synaesthesia to work under different samplerates/ buffer sizes.

Original commit message from CVS:
* gst/synaesthesia/gstsynaesthesia.c:
(gst_synaesthesia_class_init), (gst_synaesthesia_init),
(gst_synaesthesia_dispose), (gst_synaesthesia_finalize),
(gst_synaesthesia_sink_link), (gst_synaesthesia_src_getcaps),
(gst_synaesthesia_src_link), (gst_synaesthesia_chain),
(gst_synaesthesia_change_state), (plugin_init):
Fix up synaesthesia to work under different samplerates/ buffer sizes.
Force 320x200 output, as that's the only thing the underlying
synaesthesia implementation supports. Still needs to be made
re-entrant.