直播：后台 JWT 推流、前台画中画；WebRTC 服务与 Nginx WebSocket 代理

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

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+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package webrtc
+
+const (
+	// TypeRTCPFBTransportCC ..
+	TypeRTCPFBTransportCC = "transport-cc"
+
+	// TypeRTCPFBGoogREMB ..
+	TypeRTCPFBGoogREMB = "goog-remb"
+
+	// TypeRTCPFBACK ..
+	TypeRTCPFBACK = "ack"
+
+	// TypeRTCPFBCCM ..
+	TypeRTCPFBCCM = "ccm"
+
+	// TypeRTCPFBNACK ..
+	TypeRTCPFBNACK = "nack"
+)
+
+// RTCPFeedback signals the connection to use additional RTCP packet types.
+// https://draft.ortc.org/#dom-rtcrtcpfeedback
+type RTCPFeedback struct {
+	// Type is the type of feedback.
+	// see: https://draft.ortc.org/#dom-rtcrtcpfeedback
+	// valid: ack, ccm, nack, goog-remb, transport-cc
+	Type string
+
+	// The parameter value depends on the type.
+	// For example, type="nack" parameter="pli" will send Picture Loss Indicator packets.
+	Parameter string
+}