add flexfec support

.changeset/flexfec03-codec-parameters.md

@@ -0,0 +1,6 @@
+---
+"github.com/livekit/protocol": patch
+"@livekit/protocol": patch
+---
+
+Add flexfec-03 codec parameters and mime type helpers

codecs/codecs.go

@@ -174,6 +174,18 @@ var (
 		PayloadType: 116,
 	}
 
+	FlexFEC03CodecParameters = webrtc.RTPCodecParameters{
+		RTPCodecCapability: webrtc.RTPCodecCapability{
+			MimeType:    mime.MimeTypeFlexFEC03.String(),
+			ClockRate:   90000,
+			SDPFmtpLine: "repair-window=10000000",
+			RTCPFeedback: []webrtc.RTCPFeedback{
+				{Type: webrtc.TypeRTCPFBTransportCC},
+			},
+		},
+		PayloadType: 115,
+	}
+
 	VideoCodecsParameters = []webrtc.RTPCodecParameters{
 		VP8CodecParameters,
 		VP9ProfileId0CodecParameters,
@@ -245,6 +257,8 @@ func ToWebrtcCodecParameters(codec *livekit.Codec) webrtc.RTPCodecParameters {
 		}
 	case mime.MimeTypeH265:
 		params = H265CodecParameters
+	case mime.MimeTypeFlexFEC03:
+		params = FlexFEC03CodecParameters
 	default:
 		return webrtc.RTPCodecParameters{}
 	}

codecs/mime/mimetype.go

@@ -44,6 +44,7 @@ const (
 	MimeTypeCodecRTX
 	MimeTypeCodecFlexFEC
 	MimeTypeCodecULPFEC
+	MimeTypeCodecFlexFEC03
 )
 
 func (m MimeTypeCodec) String() string {
@@ -76,6 +77,8 @@ func (m MimeTypeCodec) String() string {
 		return "flexfec"
 	case MimeTypeCodecULPFEC:
 		return "ulpfec"
+	case MimeTypeCodecFlexFEC03:
+		return "flexfec-03"
 	}
 
 	return "MimeTypeCodecUnknown"
@@ -111,6 +114,8 @@ func (m MimeTypeCodec) ToMimeType() MimeType {
 		return MimeTypeFlexFEC
 	case MimeTypeCodecULPFEC:
 		return MimeTypeULPFEC
+	case MimeTypeCodecFlexFEC03:
+		return MimeTypeFlexFEC03
 	}
 
 	return MimeTypeUnknown
@@ -144,6 +149,8 @@ func NormalizeMimeTypeCodec(codec string) MimeTypeCodec {
 		return MimeTypeCodecFlexFEC
 	case strings.EqualFold(codec, "ulpfec"):
 		return MimeTypeCodecULPFEC
+	case strings.EqualFold(codec, "flexfec-03"):
+		return MimeTypeCodecFlexFEC03
 	}
 
 	return MimeTypeCodecUnknown
@@ -195,6 +202,7 @@ const (
 	MimeTypeRTX
 	MimeTypeFlexFEC
 	MimeTypeULPFEC
+	MimeTypeFlexFEC03
 )
 
 func (m MimeType) String() string {
@@ -227,6 +235,8 @@ func (m MimeType) String() string {
 		return webrtc.MimeTypeFlexFEC
 	case MimeTypeULPFEC:
 		return "video/ulpfec"
+	case MimeTypeFlexFEC03:
+		return webrtc.MimeTypeFlexFEC03
 	}
 
 	return "MimeTypeUnknown"
@@ -262,6 +272,8 @@ func (m MimeType) ReporterType() roomobs.MimeType {
 		return roomobs.MimeTypeVideoFlexfec
 	case MimeTypeULPFEC:
 		return roomobs.MimeTypeVideoUlpfec
+	case MimeTypeFlexFEC03:
+		return roomobs.MimeTypeVideoFlexfec03
 	}
 
 	return roomobs.MimeTypeUndefined
@@ -295,6 +307,8 @@ func NormalizeMimeType(mime string) MimeType {
 		return MimeTypeFlexFEC
 	case strings.EqualFold(mime, "video/ulpfec"):
 		return MimeTypeULPFEC
+	case strings.EqualFold(mime, webrtc.MimeTypeFlexFEC03):
+		return MimeTypeFlexFEC03
 	}
 
 	return MimeTypeUnknown
@@ -363,3 +377,7 @@ func IsMimeTypeStringVP9(mime string) bool {
 func IsMimeTypeStringH264(mime string) bool {
 	return NormalizeMimeType(mime) == MimeTypeH264
 }
+
+func IsMimeTypeStringFlexFEC03(mime string) bool {
+	return NormalizeMimeType(mime) == MimeTypeFlexFEC03
+}