volscale: refer to variables with their enum
volscale: refer to variables with their enum

Try to refer to variables with their enum instead of their string names as this
saves some lookup overhead.

okuoku/nmosh-orc,ijsf/OpenWebRTC-orc,mojaves/orc,ahmedammar/platform_external_gst_liborc,Distrotech/orc,jpakkane/orc,jpakkane/orc,ijsf/OpenWebRTC-orc,ijsf/OpenWebRTC-orc,Distrotech/orc,okuoku/nmosh-orc,mojaves/orc,mojaves/orc,jpakkane/orc,ahmedammar/platform_external_gst_liborc,MOXfiles/orc,okuoku/nmosh-orc,Distrotech/orc,MOXfiles/orc,MOXfiles/orc