Yes we can easily perform this function with our front end analog input muxing.
Taking the ADV7844/2 as an example:
For a component input (Y/Pb/Pr) connected to Ain4/5/6 (ADC0/1/2 respectively) the customer can plug a CVBS input to the Y connector, run the recommended CVBS script and adjust the manual muxing via the AFE Map.
AFE Map = Device address 0x4C. Enable Manual Muxing = Register 0x02 [7] = 1’b1
AFE Map = Device address 0x4C. ADC0 Muxing = Register 0x03 [7:4] = 4’bxxxx (Where xxxx selects the AinX to be routed to ADC0)
The following constraints apply on analog muxing for the ADV7844/ADV7842:
(1) The CVBS, Y or G signal must be routed to ADC0
(2) The C signal in S-Video( YC) mode must be routed to ADC2
Refer to your specific products hardware manual, Analog Front end section for more details.