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Use L1T3 for screen sharing #858

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Merged
pblazej merged 3 commits into from
Dec 4, 2025
Merged

Use L1T3 for screen sharing #858

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6e86fa7
Use L1T3 for screen sharing
pblazej Dec 3, 2025
66f546f
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pblazej Dec 3, 2025
81bfc90
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pblazej Dec 4, 2025
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1 change: 1 addition & 0 deletions .changes/screensharing-vp9
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
patch type="fixed" "Screen sharing not publishing frames with VP9/AV1 codecs"
3 changes: 2 additions & 1 deletion Sources/LiveKit/Support/Utils.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -225,7 +225,8 @@ class Utils: Loggable {
if let videoCodec, videoCodec.isSVC {
// SVC mode
log("Using SVC mode")
return [RTC.createRtpEncodingParameters(encoding: encoding, scalabilityMode: .L3T3_KEY)]
// VP9/AV1 with screen sharing requires single spatial layer
return [RTC.createRtpEncodingParameters(encoding: encoding, scalabilityMode: isScreenShare ? .L1T3 : .L3T3_KEY)]
} else if !publishOptions.simulcast {
// Not-simulcast mode
log("Simulcast not enabled")
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10 changes: 9 additions & 1 deletion Sources/LiveKit/Types/ScalabilityMode.swift
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Expand Up @@ -21,11 +21,13 @@ public enum ScalabilityMode: Int {
case L3T3 = 1
case L3T3_KEY = 2
case L3T3_KEY_SHIFT = 3
case L1T3 = 4
}

public extension ScalabilityMode {
static func fromString(_ rawString: String?) -> ScalabilityMode? {
switch rawString {
case "L1T3": .L1T3
case "L3T3": .L3T3
case "L3T3_KEY": .L3T3_KEY
case "L3T3_KEY_SHIFT": .L3T3_KEY_SHIFT
Expand All @@ -35,13 +37,19 @@ public extension ScalabilityMode {

var rawStringValue: String {
switch self {
case .L1T3: "L1T3"
case .L3T3: "L3T3"
case .L3T3_KEY: "L3T3_KEY"
case .L3T3_KEY_SHIFT: "L3T3_KEY_SHIFT"
}
}

var spatial: Int { 3 }
var spatial: Int {
switch self {
case .L1T3: 1
case .L3T3, .L3T3_KEY, .L3T3_KEY_SHIFT: 3
}
}

var temporal: Int { 3 }
}
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