basesink: Pass along miniobject type through various functions
basesink: Pass along miniobject type through various functions

Avoids doing useless GST_IS_*

https://bugzilla.gnome.org/show_bug.cgi?id=632778

shelsonjava/gstreamer,mrchapp/gstreamer,krichter722/gstreamer,Distrotech/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,justinjoy/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,jpxiong/gstreamer,magcius/gstreamer,ahmedammar/platform_external_gst_gstreamer,ylatuya/gstreamer,surround-io/gstreamer,krieger-od/gstreamer,jpxiong/gstreamer,magcius/gstreamer,ylatuya/gstreamer,krichter722/gstreamer,ahmedammar/platform_external_gst_gstreamer,Distrotech/gstreamer,krichter722/gstreamer,mparis/gstreamer,jpakkane/gstreamer,magcius/gstreamer,justinjoy/gstreamer,lubosz/gstreamer,Lachann/gstreamer,Distrotech/gstreamer,lubosz/gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,mrchapp/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,mparis/gstreamer,cfoch/gstreamer,centricular/gstreamer,collects/gstreamer,mrchapp/gstreamer,shelsonjava/gstreamer,drothlis/gstreamer,justinjoy/gstreamer,krieger-od/gstreamer,cfoch/gstreamer,ensonic/gstreamer,magcius/gstreamer,krieger-od/gstreamer,krieger-od/gstreamer,lovebug356/gstreamer,StreamUtils/gstreamer,ylatuya/gstreamer,ensonic/gstreamer,collects/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,Lachann/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,lubosz/gstreamer,jpakkane/gstreamer,drothlis/gstreamer,collects/gstreamer,cfoch/gstreamer,ahmedammar/platform_external_gst_gstreamer,cfoch/gstreamer,ensonic/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,lovebug356/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,justinjoy/gstreamer,cfoch/gstreamer,lovebug356/gstreamer,centricular/gstreamer,ylatuya/gstreamer,Lachann/gstreamer,mrchapp/gstreamer,drothlis/gstreamer,lubosz/gstreamer,lubosz/gstreamer,Distrotech/gstreamer,cablelabs/gstreamer,drothlis/gstreamer,centricular/gstreamer,ahmedammar/platform_external_gst_gstreamer,ensonic/gstreamer,magcius/gstreamer,krichter722/gstreamer,Lachann/gstreamer,surround-io/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,ahmedammar/platform_external_gst_gstreamer,ensonic/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,mrchapp/gstreamer,StreamUtils/gstreamer,collects/gstreamer,Distrotech/gstreamer,drothlis/gstreamer,ylatuya/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,mparis/gstreamer,collects/gstreamer,surround-io/gstreamer