Original commit message from CVS:
* gst/wavparse/gstwavparse.c: (gst_wavparse_reset),
(gst_wavparse_other), (gst_wavparse_perform_seek),
(gst_wavparse_stream_headers), (gst_wavparse_stream_data),
(gst_wavparse_loop), (gst_wavparse_pad_convert),
(gst_wavparse_srcpad_event), (gst_wavparse_sink_activate_pull):
* gst/wavparse/gstwavparse.h:
Use GstSegment to implement more seeking features.