mirror of
https://github.com/danog/libtgvoip.git
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61 lines
2.8 KiB
Plaintext
61 lines
2.8 KiB
Plaintext
// Simplified scheme, for the new protocol
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// Try unifying all flags, lengths and so on
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packet$_
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streamId:(## 2) // Max 2 streams, we don't need much anyway (0 and 3 are reserved values)
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// If 0, is a pure-service message
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// If 1, is an audio packet
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// If 2, is a video packet
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// If 3, is packet from one of the group call streams
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flags:(## 6)
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seq:# ackSeq:# ackMask:# // Different sequence for each streamId
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streamIdExtended:(streamId == 3 ? (## 8) : false) // Extended stream ID for group calls
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length:(## flags.0 ? 11 : (streamId > 0 ? 8 : 0))
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eFlags:(## flags.0 ? 5 : 0) // We shouldn't typically need this, but since we have the space why not use it
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fragmentIndex:eFlags.0?(## 8) // Logically, this flag can only appear on *big* fragmented messages
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fragmentCount:eFlags.0?(## 8) // Logically, this flag can only appear on *big* fragmented messages
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keyframe:eFlags.1?true // This flag can only appear for video streams (typically *big* messages, see ^)
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data:bytes // No PTS, simply use the seq
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recvTS:flags.1?int
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extraFEC:flags.2?ExtraFEC
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extraSignaling:flags.3?Extras<ExtraSignaling>
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reserved:flags.4?true:true // Always true, allows us to distinguish from legacy packets if the maxLayer is wrong.
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= Packet;
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// ExtraFEC
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extraFEC$_ mask:(## 8) [ length:(## 8) _:bytes ] = ExtraFEC;
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// Extras
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extras$_ {t:Type} (## 8) [ length:(## 8) extra:t ] = Extras t;
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extraStreamFlags#01 streamId:(## 8) flags:(## 8) enabled:flags.0?true dtx:flags.1?true extraEC:flags.2?true paused:flags.3?true = ExtraSignaling;
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extraStreamCsd#02 streamId:(## 8) width:(## 16) height:(## 16) count:(## 8) [ length:(## 8) codecSpecificData:bytes ] = ExtraSignaling;
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extraLanEndpoint#03 address:# port:(## 16) = ExtraSignaling;
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extraIpv6Endpoint#07 address:(## 128) port:(## 16) = ExtraSignaling;
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extraNetworkChanged#04 streamId:(## 8) flags:(## 8) dataSavingEnabled:flags.0?true = ExtraSignaling;
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extraGroupCallKey#05 key:(## 256) = ExtraSignaling;
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extraGroupCallUpgrade#06 = ExtraSignaling;
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// All signaling starting from here can only be done on packets with streamID 0 (only signaling, no data).
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// New init/initACK
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extraInit#08 peerVersion:# minVersion:# flags:(## 8) audioCodecs:Extras<int> decoders:Extras<int> maxResolution:(## 8) dataSavingEnabled:flags.0?true groupCallSupported:flags.1?true videoSendSupported:flags.2?true videoRecvSupported:flags.3?true = ExtraSignaling;
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extraInitAck#09 peerVersion:# minVersion:# streams:Extras<StreamInfo> = ExtraSignaling;
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// Misc signaling
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extraPing#A = ExtraSignaling;
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extraPong#B seq:# = ExtraSignaling;
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// Stream info
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streamInfo$_ streamId:(## 8) type:(## 8) codec:# frameDurationIgnored:(## 16) enabled:(## 8)= StreamInfo; |