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1d45d991aa
Previously Mumble was using a custom binary format for transmitting data via UDP (mainly audio). This has worked for a long time but besides being inconvenient for 3rdParty implementors (they had to manually re-implement encoding and decoding support for this format) this format was not very flexible and changes to the data format were very hard. In order to improve on this situation, this commit introduces changes that allow to use Protobuf for the UDP messages as well (it's already used for TCP). With that it should be relatively easy to extend/change the UDP packet formats in the future and 3rdParty implementors can now simply use Protobuf to handle decoding/encoding packets for them (much less work and much less prone to errors). Since the new Protobuf format is incompatible with the old UDP format, this commit also includes support for dealing with older clients or servers that don't recognize the new protocol yet. That way the new protocol format is only used if both the client and the server are recent enough to have it implemented (assumed to be the case >=1.5.0). Note also that the server will make sure that clients using the old and the new format can seamlessly communicate with one another. Therefore, on the surface it should not be noticeable to the user which protocol is currently used. Note also that the new protocol format only supports Opus as an audio codec. If one of the legacy codecs is to be used, the legacy packet format has to be used as well. However, all codecs except for Opus will be removed from Mumble in the future anyway. Fixes #4350 |
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