Bidirectional PAD communication protocol
The proposal is to replace it by a UDP-based request/reply protocol.
For every audio frame, the ODR-AudioEnc checks if a block of PAD data is available by doing a nonblocking recv() on the UDP socket. If yes, it inserts it into the audio frame; if not, the audio frame will not contain PAD. In any case, it sends a request to ODR-PadEnc for new data:
UDP PAD Request version 1 - message format | version (1 byte) | | 0x1 |
ODR-PadEnc prepares the PAD block and answers with a UDP reply message:
UDP PAD Reply version 1 - message format | version (1 byte) | PAD data (N bytes) | | 0x1 | <PAD> |
* Define the order of bytes for the PAD data * Endianness of multi-byte values (none yet) * Do we want to add a type field with a different value for request and reply?