questions of EDC commands

Hi, I'm using video port driver of DM642, and I know in order to configure external codec, such as saa7121, VPORT_CMD_EDC_BASE + EDC_CONFIG should be used in FVID_control function. But how can I use the EDC_USER command? For example, if I want to output the colorbar, how can I do it using EDC_USER+6, namely SAA7121_ENABLE_COLORBAR, defined in saa7121.h? thanks