gecko-dev/media/gmp-clearkey/0.1/manifest.json.in

{
    "name": "clearkey",
    "description": "ClearKey Gecko Media Plugin",
    "version": "1",
    "x-cdm-module-versions": "4",
    "x-cdm-interface-versions": "10",
    "x-cdm-host-versions": "10",
#ifdef ENABLE_WMF
    "x-cdm-codecs": "avc1"
#else
    "x-cdm-codecs": ""
#endif
}