valve: proxy caps and allocation
valve: proxy caps and allocation

Proxy the caps queries on the srcpad as well.
Proxy the allocation query on the sinkpad.

cfoch/gstreamer,shelsonjava/gstreamer,cfoch/gstreamer,Lachann/gstreamer,mparis/gstreamer,jpakkane/gstreamer,mparis/gstreamer,krieger-od/gstreamer,krichter722/gstreamer,krieger-od/gstreamer,jpakkane/gstreamer,centricular/gstreamer,lubosz/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,Lachann/gstreamer,StreamUtils/gstreamer,ensonic/gstreamer,surround-io/gstreamer,cablelabs/gstreamer,centricular/gstreamer,lubosz/gstreamer,jpxiong/gstreamer,centricular/gstreamer,lovebug356/gstreamer,mparis/gstreamer,lovebug356/gstreamer,cablelabs/gstreamer,krichter722/gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,cfoch/gstreamer,cfoch/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,ensonic/gstreamer,ensonic/gstreamer,jpxiong/gstreamer,mparis/gstreamer,lubosz/gstreamer,centricular/gstreamer,cablelabs/gstreamer,lubosz/gstreamer,jpakkane/gstreamer,cablelabs/gstreamer,lubosz/gstreamer,Lachann/gstreamer,cfoch/gstreamer,Lachann/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,cablelabs/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,shelsonjava/gstreamer,ensonic/gstreamer,ensonic/gstreamer,jpakkane/gstreamer,Lachann/gstreamer,krichter722/gstreamer,krieger-od/gstreamer,jpxiong/gstreamer,krieger-od/gstreamer