Methods and devices for CEC block termination
A CEC block termination function, operated by a manipulating switch including at least one HDMI-CEC input port and at least two HDMI-CEC output ports, enables the manipulating switch to receive a CEC block which was initiated by a device, optionally acknowledge (ACK) the block, modify the received block, and supply the modified block to one or more devices. Optionally, a section of the CEC block may be modified, the entire CEC block may be modified, or the CEC message may be partially or completely modified.
1. A manipulating switch comprising: a first High-Definition Multimedia Interface-Consumer Electronics Control (HDMI-CEC) port operative to receive a CEC block comprising source and destination CEC logical addresses according to the initiator's HDMI-CEC network view; a logic configured to acknowledge the CEC block, if it is not a broadcast block, and to modify the source and destination CEC logical addresses according to the follower's HDMI-CEC network view; and a second HDMI-CEC port operative to forward the modified CEC block to the follower.
2. The manipulating switch of claim 1 , wherein only the CEC header block is modified.
3. The manipulating switch of claim 1 , wherein also a CEC physical address is modified.
4. The manipulating switch of claim 1 , further comprising means for modifying one or more bits in the received CEC block.
5. A High-Definition Multimedia Interface-Consumer Electronics Control (HDMI-CEC) device storing a first CEC logical address matching a first HDMI-CEC cluster tree of a first HDMI-CEC display device, whereby the HDMI-CEC device is also associated with a second HDMI-CEC cluster tree of a second HDMI-CEC display device through a manipulating switch; in the network view of the second HDMI-CEC display device, the manipulating switch is configured to assign to the HDMI-CEC device a second CEC logical address that is different from the first CEC logical address; wherein the manipulating switch is further configured to receive a CEC block, acknowledge the CEC block, modify the CEC block, and forward the modified CEC block to the HDMI-CEC device.
6. The HDMI-CEC device of claim 5 , wherein the manipulating switch is further configured to replace the CEC destination address with the first CEC logical address.
7. The HDMI-CEC device of claim 6 , wherein the manipulating switch is further configured to modify one or more bits in the received CEC block.
8. The HDMI-CEC device of claim 5 , wherein the manipulating switch is further configured to receive a CEC block which was initiated by the HDMI-CEC device, acknowledge the CEC block initiated by the HDMI-CEC device, modify the CEC block initiated by the HDMI-CEC device to match the network view of the second HDMI-CEC display device, and forward the modified CEC block to the second HDMI-CEC display device.
9. The HDMI-CEC device of claim 5 , wherein only the CEC header block is modified.
10. The HDMI-CEC device of claim 5 , wherein also a CEC physical address is modified.
11. A method comprising: receiving, by a manipulating switch, a CEC block through a first High-Definition Multimedia Interface-Consumer Electronics Control (HDMI-CEC) port; acknowledging the reception of the CEC block by the manipulating switch; modifying one or more bits in the received CEC block; and sending the modified CEC block through at least a second HDMI-CEC port.
12. The method of claim 11 , wherein the step of modifying one or more bits in the received CEC block comprises modifying the entire block.
13. The method of claim 11 , wherein the step of modifying one or more bits in the received CEC block comprises discarding the entire block.
14. The method of claim 11 , wherein the step of modifying one or more bits in the received CEC block comprises generating an additional block.
15. The method of claim 11 , further comprising, if the follower does not acknowledge receiving the modified CEC block, dropping the CEC message utilizing a CEC <feature abort> message.
16. The method of claim 11 , further comprising, if the follower does not acknowledge receiving the modified CEC block, generating CEC line error.
17. The method of claim 11 , wherein the CEC block further comprises a CEC source logical address, and the step of modifying one or more bits further comprises modifying the CEC source logical address in order to match the follower's HDMI-CEC network view.
18. A method comprising: receiving, by a manipulating switch, a CEC block comprising a destination logical address matching the initiator's High-Definition Multimedia Interface-Consumer Electronics Control (HDMI-CEC) network view; acknowledging the CEC block; and modifying, by the manipulating switch, the destination logical address to match the follower's HDMI-CEC network view.
19. The method of claim 18 , further comprising the step of forwarding the modified block to the follower.
20. The method of claim 19 , wherein the CEC block further comprises a CEC source logical address, and further comprising the step of modifying the CEC source logical address in order to match the follower's HDMI-CEC network view.
21. The method of claim 19 , further comprising, if the follower does not acknowledge receiving the modified CEC block, dropping the CEC message utilizing a CEC <feature abort> message.
22. The method of claim 19 , further comprising, if the follower does not acknowledge receiving the modified CEC block, generating CEC line error.
23. The method of claim 18 , further comprising the step of modifying one or more bits in the received CEC block.
24. The method of claim 23 , wherein the step of modifying one or more bits in the received CEC block comprises modifying the entire block.
25. The method of claim 23 , wherein the step of modifying one or more bits in the received CEC block comprises discarding the entire block.
26. The method of claim 23 , wherein the step of modifying one or more bits in the received CEC block comprises generating an additional block.