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server/vendor/github.com/pion/webrtc/v3/rtpcodec.go

@@ -0,0 +1,136 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package webrtc
+
+import (
+	"strings"
+
+	"github.com/pion/webrtc/v3/internal/fmtp"
+)
+
+// RTPCodecType determines the type of a codec
+type RTPCodecType int
+
+const (
+
+	// RTPCodecTypeAudio indicates this is an audio codec
+	RTPCodecTypeAudio RTPCodecType = iota + 1
+
+	// RTPCodecTypeVideo indicates this is a video codec
+	RTPCodecTypeVideo
+)
+
+func (t RTPCodecType) String() string {
+	switch t {
+	case RTPCodecTypeAudio:
+		return "audio" //nolint: goconst
+	case RTPCodecTypeVideo:
+		return "video" //nolint: goconst
+	default:
+		return ErrUnknownType.Error()
+	}
+}
+
+// NewRTPCodecType creates a RTPCodecType from a string
+func NewRTPCodecType(r string) RTPCodecType {
+	switch {
+	case strings.EqualFold(r, RTPCodecTypeAudio.String()):
+		return RTPCodecTypeAudio
+	case strings.EqualFold(r, RTPCodecTypeVideo.String()):
+		return RTPCodecTypeVideo
+	default:
+		return RTPCodecType(0)
+	}
+}
+
+// RTPCodecCapability provides information about codec capabilities.
+//
+// https://w3c.github.io/webrtc-pc/#dictionary-rtcrtpcodeccapability-members
+type RTPCodecCapability struct {
+	MimeType     string
+	ClockRate    uint32
+	Channels     uint16
+	SDPFmtpLine  string
+	RTCPFeedback []RTCPFeedback
+}
+
+// RTPHeaderExtensionCapability is used to define a RFC5285 RTP header extension supported by the codec.
+//
+// https://w3c.github.io/webrtc-pc/#dom-rtcrtpcapabilities-headerextensions
+type RTPHeaderExtensionCapability struct {
+	URI string
+}
+
+// RTPHeaderExtensionParameter represents a negotiated RFC5285 RTP header extension.
+//
+// https://w3c.github.io/webrtc-pc/#dictionary-rtcrtpheaderextensionparameters-members
+type RTPHeaderExtensionParameter struct {
+	URI string
+	ID  int
+}
+
+// RTPCodecParameters is a sequence containing the media codecs that an RtpSender
+// will choose from, as well as entries for RTX, RED and FEC mechanisms. This also
+// includes the PayloadType that has been negotiated
+//
+// https://w3c.github.io/webrtc-pc/#rtcrtpcodecparameters
+type RTPCodecParameters struct {
+	RTPCodecCapability
+	PayloadType PayloadType
+
+	statsID string
+}
+
+// RTPParameters is a list of negotiated codecs and header extensions
+//
+// https://w3c.github.io/webrtc-pc/#dictionary-rtcrtpparameters-members
+type RTPParameters struct {
+	HeaderExtensions []RTPHeaderExtensionParameter
+	Codecs           []RTPCodecParameters
+}
+
+type codecMatchType int
+
+const (
+	codecMatchNone    codecMatchType = 0
+	codecMatchPartial codecMatchType = 1
+	codecMatchExact   codecMatchType = 2
+)
+
+// Do a fuzzy find for a codec in the list of codecs
+// Used for lookup up a codec in an existing list to find a match
+// Returns codecMatchExact, codecMatchPartial, or codecMatchNone
+func codecParametersFuzzySearch(needle RTPCodecParameters, haystack []RTPCodecParameters) (RTPCodecParameters, codecMatchType) {
+	needleFmtp := fmtp.Parse(needle.RTPCodecCapability.MimeType, needle.RTPCodecCapability.SDPFmtpLine)
+
+	// First attempt to match on MimeType + SDPFmtpLine
+	for _, c := range haystack {
+		cfmtp := fmtp.Parse(c.RTPCodecCapability.MimeType, c.RTPCodecCapability.SDPFmtpLine)
+		if needleFmtp.Match(cfmtp) {
+			return c, codecMatchExact
+		}
+	}
+
+	// Fallback to just MimeType
+	for _, c := range haystack {
+		if strings.EqualFold(c.RTPCodecCapability.MimeType, needle.RTPCodecCapability.MimeType) {
+			return c, codecMatchPartial
+		}
+	}
+
+	return RTPCodecParameters{}, codecMatchNone
+}
+func rtcpFeedbackIntersection(a, b []RTCPFeedback) (out []RTCPFeedback) {
+	for _, aFeedback := range a {
+		for _, bFeeback := range b {
+			if aFeedback.Type == bFeeback.Type && aFeedback.Parameter == bFeeback.Parameter {
+				out = append(out, aFeedback)
+				break
+			}
+		}
+	}
+
+	return
+}
+