clock: add some more comments.
clock: add some more comments.

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