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Fix RTP extended header parsing

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As ext header length isn't always 1, the shift to find the beginning of
the Opus packet must be adjusted dynamically.
This commit is contained in:
Gabriele Alberti 2021-02-22 13:20:15 +01:00
parent c27ad65527
commit b18e1d7276
1 changed files with 9 additions and 3 deletions
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12
voice.go
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@ -831,9 +831,15 @@ func (v *VoiceConnection) opusReceiver(udpConn *net.UDPConn, close <-chan struct
copy(nonce[:], recvbuf[0:12])
p.Opus, _ = secretbox.Open(nil, recvbuf[12:rlen], &nonce, &v.op4.SecretKey)
if len(p.Opus) > 8 && recvbuf[0] == 0x90 {
// Extension bit is set, first 8 bytes is the extended header
p.Opus = p.Opus[8:]
// extension bit set, and not a RTCP packet
if ((recvbuf[0] & 0x10) == 0x10) && ((recvbuf[1] & 0x80) == 0) {
// get extended header length
extlen := binary.BigEndian.Uint16(p.Opus[2:4])
// 4 bytes (ext header header) + 4*extlen (ext header data)
shift := int(4 + 4*extlen)
if len(p.Opus) > shift {
p.Opus = p.Opus[shift:]
}
}
if c != nil {