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Handle Simulcast RepairStream

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Read + Discard packets from the Simulcast repair stream. When a
Simulcast stream is enabled the remote will send packets via the repair
stream for probing. We can't ignore these packets anymore because it
will cause gaps in the feedback reports

Resolves #1957
This commit is contained in:
Sean DuBois
2021-09-14 22:31:10 -04:00
parent f8fa792477
commit 11b8873da2
9 changed files with 161 additions and 72 deletions
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10
rtptransceiver.go
View File

@@ -247,7 +247,7 @@ func satisfyTypeAndDirection(remoteKind RTPCodecType, remoteDirection RTPTransce
// handleUnknownRTPPacket consumes a single RTP Packet and returns information that is helpful
// for demuxing and handling an unknown SSRC (usually for Simulcast)
func handleUnknownRTPPacket(buf []byte, midExtensionID, streamIDExtensionID uint8) (mid, rid string, payloadType PayloadType, err error) {
func handleUnknownRTPPacket(buf []byte, midExtensionID, streamIDExtensionID, repairStreamIDExtensionID uint8, mid, rid, rsid *string) (payloadType PayloadType, err error) {
rp := &rtp.Packet{}
if err = rp.Unmarshal(buf); err != nil {
return
@@ -259,11 +259,15 @@ func handleUnknownRTPPacket(buf []byte, midExtensionID, streamIDExtensionID uint
payloadType = PayloadType(rp.PayloadType)
if payload := rp.GetExtension(midExtensionID); payload != nil {
mid = string(payload)
*mid = string(payload)
}
if payload := rp.GetExtension(streamIDExtensionID); payload != nil {
rid = string(payload)
*rid = string(payload)
}
if payload := rp.GetExtension(repairStreamIDExtensionID); payload != nil {
*rsid = string(payload)
}
return